From bc48490850cf74531376f976303158bf3ea42e6c Mon Sep 17 00:00:00 2001 From: jedarden Date: Sat, 23 May 2026 02:55:28 -0400 Subject: [PATCH] =?UTF-8?q?P6.2:=20Verify=20peer=20discovery=20implementat?= =?UTF-8?q?ion=20(plan=20=C2=A714.5)?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Verified that peer discovery via headless Service + Downward API is fully implemented per plan §14.5. Implementation components verified: - Helm: miroir-headless.yaml (headless Service) - Deployment: POD_NAME, POD_NAMESPACE, POD_IP env vars via Downward API - Rust: PeerDiscovery module with SRV lookup - Main: Background refresh loop (every 15s) - Metrics: miroir_peer_pod_count gauge - Config: PeerDiscoveryConfig with defaults - Verification script: tests/verify_p6_2_peer_discovery.sh Tests passed: - test_peer_set_empty - test_peer_set_with_peers - test_srv_target_pod_name_extraction Build status: cargo build --release succeeds Co-Authored-By: Claude Opus 4.7 --- .beads/issues.jsonl | 8 +- .beads/traces/miroir-afh.1/metadata.json | 16 + .beads/traces/miroir-afh.1/stderr.txt | 2 + .beads/traces/miroir-afh.1/stdout.txt | 4597 ++++++++++++++++++++++ .beads/traces/miroir-m9q.2/metadata.json | 8 +- .beads/traces/miroir-m9q.2/stderr.txt | 2 + .beads/traces/miroir-m9q.2/stdout.txt | 3674 +++++++++++++---- .beads/traces/miroir-mkk.1/metadata.json | 4 +- .beads/traces/miroir-mkk.1/stdout.txt | 3593 +++++++++-------- 9 files changed, 9480 insertions(+), 2424 deletions(-) create mode 100644 .beads/traces/miroir-afh.1/metadata.json create mode 100644 .beads/traces/miroir-afh.1/stderr.txt create mode 100644 .beads/traces/miroir-afh.1/stdout.txt diff --git a/.beads/issues.jsonl b/.beads/issues.jsonl index b31a550..65f784d 100644 --- a/.beads/issues.jsonl +++ b/.beads/issues.jsonl @@ -38,7 +38,7 @@ {"id":"miroir-9dj.7","title":"P2.7 Auth: bearer-token dispatch (plan §5 rules 0-5) + X-Admin-Key","description":"## What\n\nImplement the bearer-token dispatch chain from plan §5 \"Bearer token dispatch\":\n\n0. **Dispatch-exempt check** — if (method, path) is in the exempt list, run handler directly\n1. **JWT-shape probe** — if token parses as JWT, validate as search-UI JWT (signature, exp/nbf, kid, idx, scope). Parseable-but-invalid → 401 `miroir_jwt_invalid`. Signature-valid but scope mismatch → 403 `miroir_jwt_scope_denied`. Phase 5 §13.21 adds the JWT validation; Phase 2 stubs this to \"not-a-jwt → next step\"\n2. **Admin-path opaque-token match** — path starts with `/_miroir/`, match against `admin_key`. Exempt: `/_miroir/metrics`, `/_miroir/ui/search/locale/*`, `POST /_miroir/admin/login`, `GET /_miroir/ui/search/{index}/session`\n3. **Master-key match** — other paths → `master_key`\n4. **Mismatch** → 401 `miroir_invalid_auth`\n5. **Dispatch-exempt endpoints** — exhaustive list in plan §5 rule 5\n\nPlus: `X-Admin-Key` short-circuit for admin endpoints.\n\n## Why\n\nPlan §5: \"Three token types can appear on `Authorization: Bearer ` simultaneously — the `master_key`, the `admin_key`, and a search UI JWT. Miroir resolves them deterministically.\" Without a consistent dispatch chain, Phase 5 §13.21's JWT path conflicts with admin/master key on the same header. Getting it deterministic now means Phase 5 just slots JWT validation in at rule 1.\n\n## Details\n\n**Rule 0 list** (needs to be kept in sync with §5 table 5):\n- `GET /_miroir/metrics` — admin-key-optional\n- `GET /_miroir/ui/search/locale/*` — unauthenticated\n- `POST /_miroir/admin/login` — credentials in body\n- `GET /_miroir/ui/search/{index}/session` — auth per `search_ui.auth.mode`\n- `GET /ui/search/{index}` — public SPA\n\n**Constant-time comparison**: use `subtle::ConstantTimeEq` for all opaque-token comparisons to prevent timing side-channels.\n\n**Rate-limit hooks**: wire in `miroir:ratelimit:adminlogin:` and `miroir:ratelimit:searchui:` bucket counters from Phase 3 task store; Phase 2 may keep in-memory until Phase 6 multi-pod.\n\n## Acceptance\n\n- [ ] Every row in plan §5 rule 5 exempt list has a unit test (request does NOT match admin_key / master_key)\n- [ ] Opaque token on `/_miroir/*` matches only admin_key; never master_key\n- [ ] Opaque token on other paths matches only master_key; never admin_key\n- [ ] Missing Authorization on auth-gated endpoints → 401 `miroir_invalid_auth`\n- [ ] `X-Admin-Key` alone gates admin endpoints equivalently to Bearer admin_key\n- [ ] Constant-time compare: test with timing-injection harness shows no measurable delta between \"wrong length\" and \"wrong bytes\"","design":"","acceptance_criteria":"","notes":"","status":"closed","priority":0,"issue_type":"task","assignee":"claude-code-glm-4.7-mobile-gaming","created_at":"2026-04-18T21:28:30.212339590Z","created_by":"coding","updated_at":"2026-05-22T19:32:10.048664285Z","closed_at":"2026-05-22T19:32:10.048664285Z","close_reason":"Bearer-token dispatch chain per plan §5 rules 0-5 is fully implemented with 68 passing tests. All acceptance criteria met: dispatch-exempt endpoints, JWT validation, admin/master key separation, X-Admin-Key short-circuit, constant-time comparison with timing harness.","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase-2"]} {"id":"miroir-9dj.8","title":"P2.8 Middleware: structured logging + prometheus metrics + request IDs","description":"## What\n\nImplement `miroir-proxy::middleware`:\n- Request ID generation (UUIDv7 prefix short-hashed) attached as `X-Request-Id` on every response\n- Structured JSON log per plan §10 shape (timestamp, level, message, index, duration_ms, node_count, estimated_hits, degraded)\n- Prometheus histogram: `miroir_request_duration_seconds{method, path_template, status}`\n- Counter: `miroir_requests_total{method, path_template, status}`\n- Gauge: `miroir_requests_in_flight`\n- Scatter metrics: `miroir_scatter_fan_out_size`, `miroir_scatter_partial_responses_total`, `miroir_scatter_retries_total`\n- Node metrics: `miroir_node_healthy`, `miroir_node_request_duration_seconds`, `miroir_node_errors_total`\n\n## Why\n\nPhase 7 builds dashboards and alerts on these exact metric names. Defining them here (not at Phase 7) means every P2.X feature already emits the right signals without retrofit.\n\n**`path_template` (not `path`)** is critical: `/indexes/{uid}/search` is a template; substituting actual values produces high-cardinality labels that OOM Prometheus. Axum provides the matched route template via `MatchedPath` extractor.\n\n## Details\n\n**Log format** (plan §10 exact shape):\n```json\n{\n \"timestamp\": \"2026-05-01T12:00:00.000Z\",\n \"level\": \"info\",\n \"message\": \"search completed\",\n \"index\": \"products\",\n \"duration_ms\": 42,\n \"node_count\": 3,\n \"estimated_hits\": 15420,\n \"degraded\": false\n}\n```\n\nLogs go to stdout, one JSON object per line. Use `tracing-subscriber` with `fmt::layer().json()`.\n\n**In-flight gauge**: increment on request start, decrement via `Drop` guard so even panics decrement correctly.\n\n**Metrics server on `:9090`**: separate axum listener from the client API; no auth (bound to cluster network); `/metrics` returns prometheus exposition format.\n\n## Acceptance\n\n- [ ] `curl localhost:9090/metrics` returns all listed metrics with ≥ 1 sample after a single request\n- [ ] `jq` parses every log line without error\n- [ ] Request ID appears in response header and in the log entry for that request\n- [ ] High-cardinality defense: `path_template` never contains a UUID or arbitrary UID","design":"","acceptance_criteria":"","notes":"","status":"open","priority":1,"issue_type":"task","created_at":"2026-04-18T21:28:30.240006979Z","created_by":"coding","updated_at":"2026-04-18T21:28:30.240006979Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase-2"]} {"id":"miroir-afh","title":"Phase 7 — Observability + Ops (§10)","description":"## Phase 7 Epic — Observability + Ops\n\nShips the metric set, log format, tracing hooks, alert rules, and Grafana dashboard specified in plan §10 + the resource-pressure additions from §14.9.\n\n## Why A Dedicated Phase\n\nObservability accretes badly: if you wire metrics per-feature, you end up with inconsistent naming, duplicate counters, and missing labels. Plan §10 names every metric up front so Phase 5 can depend on a stable registry. This phase makes sure the registry lines up with the plan and the Grafana dashboard reads real data.\n\n## Scope (plan §10 + §14.9)\n\n**Health endpoints**\n- `GET /health` — Meilisearch-compatible, used as liveness\n- `GET /_miroir/ready` — readiness; 503 until covering quorum reachable\n- `GET /_miroir/topology` — full cluster state (shape in plan §10)\n\n**Prometheus metrics** (all prefixed `miroir_`)\n- Requests: `miroir_request_duration_seconds{method,path_template,status}` histogram, `miroir_requests_total` counter, `miroir_requests_in_flight` gauge\n- Node health: `miroir_node_healthy{node_id}`, `miroir_node_request_duration_seconds{node_id,operation}`, `miroir_node_errors_total{node_id,error_type}`\n- Shards: `miroir_shard_coverage`, `miroir_degraded_shards_total`, `miroir_shard_distribution{node_id}`\n- Task registry: `miroir_task_processing_age_seconds`, `miroir_tasks_total{status}`, `miroir_task_registry_size`\n- Scatter-gather: `miroir_scatter_fan_out_size`, `miroir_scatter_partial_responses_total`, `miroir_scatter_retries_total`\n- Rebalancer: `miroir_rebalance_in_progress`, `miroir_rebalance_documents_migrated_total`, `miroir_rebalance_duration_seconds`\n- §13.11–21 family groups (all 11 listed in plan §10 \"Advanced capabilities metrics\")\n- §14.9 resource-pressure: `miroir_memory_pressure`, `miroir_cpu_throttled_seconds_total`, `miroir_request_queue_depth`, `miroir_background_queue_depth{job_type}`, `miroir_peer_pod_count`, `miroir_leader`, `miroir_owned_shards_count`\n\n**Ports**\n- Port 7700: `/_miroir/metrics` admin-key-gated\n- Port 9090: `/metrics` unauthenticated, pod-internal, ServiceMonitor target\n\n**Grafana dashboard** (`dashboards/miroir-overview.json`) — 8 panels per plan §10 + feature-flag-gated panels for §13.11–21 when flags are on\n\n**ServiceMonitor** (plan §10 YAML)\n\n**Alerting** (`PrometheusRule` per plan §10 + §14.9)\n- MiroirDegradedShards, MiroirNodeDown, MiroirHighSearchLatency, MiroirTaskStuck, MiroirRebalanceStuck\n- MiroirSettingsDivergence (paired with §13.5 reconciler)\n- MiroirAntientropyMismatch (paired with §13.8 at 3 consecutive passes)\n- MiroirMemoryPressure, MiroirRequestQueueBacklog, MiroirBackgroundJobBacklog, MiroirPeerDiscoveryGap, MiroirNoLeader\n\n**Tracing (optional)** — OpenTelemetry with configurable sample_rate; disabled by default; each search produces one parent span with a child per covering-set node\n\n**Log format** — structured JSON to stdout; schema per plan §10\n\n## Definition of Done\n\n- [ ] Every metric in plan §10 + §14.9 registered and scraping on port 9090\n- [ ] `/_miroir/metrics` on port 7700 returns identical data when admin-key-authenticated\n- [ ] Grafana dashboard JSON imports cleanly; all 8 core panels render from a live scrape\n- [ ] All 12 alerts live in the shipped PrometheusRule manifest\n- [ ] OTel trace contains one parent span per request and one child per node call\n- [ ] Log entries match the schema verbatim (parseable as JSON)\n- [ ] ServiceMonitor picks up the metrics service in a kind cluster test","design":"","acceptance_criteria":"","notes":"","status":"open","priority":0,"issue_type":"epic","created_at":"2026-04-18T21:21:13.574251289Z","created_by":"coding","updated_at":"2026-04-18T21:23:08.669964534Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase","phase-7"],"dependencies":[{"issue_id":"miroir-afh","depends_on_id":"miroir-9dj","type":"blocks","created_at":"2026-04-18T21:23:08.669932412Z","created_by":"coding","metadata":"{}","thread_id":""}]} -{"id":"miroir-afh.1","title":"P7.1 Core metrics families: requests, nodes, shards, tasks, scatter, rebalancer","description":"## What\n\nRegister the plan §10 core metric families on `:9090/metrics` AND `/_miroir/metrics` (admin-key gated mirror):\n\n**Requests** (histogram + counter + gauge):\n- `miroir_request_duration_seconds{method, path_template, status}`\n- `miroir_requests_total{method, path_template, status}`\n- `miroir_requests_in_flight`\n\n**Node health**:\n- `miroir_node_healthy{node_id}`\n- `miroir_node_request_duration_seconds{node_id, operation}`\n- `miroir_node_errors_total{node_id, error_type}`\n\n**Shards**:\n- `miroir_shard_coverage`\n- `miroir_degraded_shards_total`\n- `miroir_shard_distribution{node_id}`\n\n**Tasks**:\n- `miroir_task_processing_age_seconds`\n- `miroir_tasks_total{status}`\n- `miroir_task_registry_size`\n\n**Scatter-gather**:\n- `miroir_scatter_fan_out_size`\n- `miroir_scatter_partial_responses_total`\n- `miroir_scatter_retries_total`\n\n**Rebalancer**:\n- `miroir_rebalance_in_progress`\n- `miroir_rebalance_documents_migrated_total`\n- `miroir_rebalance_duration_seconds`\n\n## Why\n\nPlan §10 + Phase 9 dashboard + alerts all depend on these exact names. Naming is a contract — changing them post-v1.0 breaks every downstream dashboard + alert rule.\n\n## Details\n\n**Label cardinality defense**:\n- `path_template` MUST be the axum matched path (not the raw URL)\n- `node_id` is bounded (~dozens)\n- `status` is the HTTP status code (~10s)\n- `error_type` is enum-limited (not a raw error string)\n- `operation` is the backend call name ({search, documents_post, stats_get, ...})\n\n**Histogram buckets**: use prometheus default buckets for duration histograms unless the plan calls out specifics.\n\n**Port 9090 (unauth, pod-internal)** is the canonical scrape target; port 7700 `/_miroir/metrics` (admin-auth) returns identical data for ad-hoc inspection from outside.\n\n## Acceptance\n\n- [ ] `curl localhost:9090/metrics | grep '^miroir_'` lists every metric name above\n- [ ] `curl -H \"Authorization: Bearer $ADMIN_KEY\" localhost:7700/_miroir/metrics` returns the same data\n- [ ] `path_template` labels contain no UUIDs or dynamic segments\n- [ ] A request that hits 3 nodes produces a `miroir_scatter_fan_out_size` histogram sample of 3","design":"","acceptance_criteria":"","notes":"","status":"open","priority":0,"issue_type":"task","created_at":"2026-04-18T21:42:04.459011674Z","created_by":"coding","updated_at":"2026-04-18T21:42:04.459011674Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase-7"]} +{"id":"miroir-afh.1","title":"P7.1 Core metrics families: requests, nodes, shards, tasks, scatter, rebalancer","description":"## What\n\nRegister the plan §10 core metric families on `:9090/metrics` AND `/_miroir/metrics` (admin-key gated mirror):\n\n**Requests** (histogram + counter + gauge):\n- `miroir_request_duration_seconds{method, path_template, status}`\n- `miroir_requests_total{method, path_template, status}`\n- `miroir_requests_in_flight`\n\n**Node health**:\n- `miroir_node_healthy{node_id}`\n- `miroir_node_request_duration_seconds{node_id, operation}`\n- `miroir_node_errors_total{node_id, error_type}`\n\n**Shards**:\n- `miroir_shard_coverage`\n- `miroir_degraded_shards_total`\n- `miroir_shard_distribution{node_id}`\n\n**Tasks**:\n- `miroir_task_processing_age_seconds`\n- `miroir_tasks_total{status}`\n- `miroir_task_registry_size`\n\n**Scatter-gather**:\n- `miroir_scatter_fan_out_size`\n- `miroir_scatter_partial_responses_total`\n- `miroir_scatter_retries_total`\n\n**Rebalancer**:\n- `miroir_rebalance_in_progress`\n- `miroir_rebalance_documents_migrated_total`\n- `miroir_rebalance_duration_seconds`\n\n## Why\n\nPlan §10 + Phase 9 dashboard + alerts all depend on these exact names. Naming is a contract — changing them post-v1.0 breaks every downstream dashboard + alert rule.\n\n## Details\n\n**Label cardinality defense**:\n- `path_template` MUST be the axum matched path (not the raw URL)\n- `node_id` is bounded (~dozens)\n- `status` is the HTTP status code (~10s)\n- `error_type` is enum-limited (not a raw error string)\n- `operation` is the backend call name ({search, documents_post, stats_get, ...})\n\n**Histogram buckets**: use prometheus default buckets for duration histograms unless the plan calls out specifics.\n\n**Port 9090 (unauth, pod-internal)** is the canonical scrape target; port 7700 `/_miroir/metrics` (admin-auth) returns identical data for ad-hoc inspection from outside.\n\n## Acceptance\n\n- [ ] `curl localhost:9090/metrics | grep '^miroir_'` lists every metric name above\n- [ ] `curl -H \"Authorization: Bearer $ADMIN_KEY\" localhost:7700/_miroir/metrics` returns the same data\n- [ ] `path_template` labels contain no UUIDs or dynamic segments\n- [ ] A request that hits 3 nodes produces a `miroir_scatter_fan_out_size` histogram sample of 3","design":"","acceptance_criteria":"","notes":"","status":"open","priority":0,"issue_type":"task","assignee":"","created_at":"2026-04-18T21:42:04.459011674Z","created_by":"coding","updated_at":"2026-05-23T06:29:31.165574257Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase-7"]} {"id":"miroir-afh.2","title":"P7.2 §13.11-21 metric families wired behind feature flags","description":"## What\n\nRegister the §13.11–21 advanced-capabilities metric families (plan §10 \"Advanced capabilities metrics\") behind each feature's `enabled: true` flag:\n\n- Multi-search (§13.11): `miroir_multisearch_queries_per_batch`, `miroir_multisearch_batches_total`, `miroir_multisearch_partial_failures_total`, `miroir_tenant_session_pin_override_total{tenant}`\n- Vector (§13.12): `miroir_vector_search_over_fetched_total`, `miroir_vector_merge_strategy{strategy}`, `miroir_vector_embedder_drift_total`\n- CDC (§13.13): `miroir_cdc_events_published_total{sink,index}`, `miroir_cdc_lag_seconds{sink}`, `miroir_cdc_buffer_bytes{sink}`, `miroir_cdc_dropped_total{sink}`, `miroir_cdc_events_suppressed_total{origin}`\n- TTL (§13.14): `miroir_ttl_documents_expired_total{index}`, `miroir_ttl_sweep_duration_seconds{index}`, `miroir_ttl_pending_estimate{index}`\n- Tenant (§13.15): `miroir_tenant_queries_total{tenant,group}`, `miroir_tenant_pinned_groups{tenant}`, `miroir_tenant_fallback_total{reason}`\n- Shadow (§13.16): `miroir_shadow_diff_total{kind}`, `miroir_shadow_kendall_tau`, `miroir_shadow_latency_delta_seconds`, `miroir_shadow_errors_total{target,side}`\n- ILM (§13.17): `miroir_rollover_events_total{policy}`, `miroir_rollover_active_indexes{alias}`, `miroir_rollover_documents_expired_total{policy}`, `miroir_rollover_last_action_seconds{policy}`\n- Canary (§13.18): `miroir_canary_runs_total{canary,result}`, `miroir_canary_latency_ms{canary}`, `miroir_canary_assertion_failures_total{canary,assertion_type}`\n- Admin UI (§13.19): `miroir_admin_ui_sessions_total`, `miroir_admin_ui_action_total{action}`, `miroir_admin_ui_destructive_action_total{action}`\n- Explain (§13.20): `miroir_explain_requests_total`, `miroir_explain_warnings_total{warning_type}`, `miroir_explain_execute_total`\n- Search UI (§13.21): `miroir_search_ui_sessions_total`, `miroir_search_ui_queries_total{index}`, `miroir_search_ui_zero_hits_total{index}`, `miroir_search_ui_click_through_total{index}`, `miroir_search_ui_p95_ms{index}`\n\n## Why\n\nPlan §10 \"Grafana dashboard panels for these families will be added to `dashboards/miroir-overview.json` when the relevant feature flag is enabled; until then they are scrape-only.\" Gating by feature flag keeps the default scrape output compact for minimal deployments.\n\n## Details\n\n**Registration pattern**: each §13.x subsection's module owns its metrics `Lazy` / etc., registered into the global registry on first access (after `Config::validate` confirms the feature is enabled).\n\n**Label cardinality audit**: `{tenant}` and `{index}` are unbounded — document which metrics need dropping to cardinality caps (e.g., top 100 tenants reported individually, rest bucketed as \"other\"). Decide per metric during implementation; note decisions in feature-specific beads.\n\n## Acceptance\n\n- [ ] With all §13 flags off, `curl :9090/metrics | grep '^miroir_' | wc -l` is close to the Phase 7 P7.1 count (only core families emit)\n- [ ] With all §13 flags on, every family name above appears in the scrape\n- [ ] Label cardinality: any `{tenant}` or `{index}` metric bounded per its per-feature cap (not unlimited)","design":"","acceptance_criteria":"","notes":"","status":"open","priority":1,"issue_type":"task","created_at":"2026-04-18T21:42:04.479172125Z","created_by":"coding","updated_at":"2026-04-18T21:42:08.230945305Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase-7"],"dependencies":[{"issue_id":"miroir-afh.2","depends_on_id":"miroir-afh.1","type":"blocks","created_at":"2026-04-18T21:42:08.230920336Z","created_by":"coding","metadata":"{}","thread_id":""}]} {"id":"miroir-afh.3","title":"P7.3 Grafana dashboard: dashboards/miroir-overview.json","description":"## What\n\nBuild the plan §10 Grafana dashboard at `dashboards/miroir-overview.json` with 8 panels:\n1. Cluster health — degraded shards, node healthy table\n2. Request rate — by path template\n3. p50/p95/p99 latency\n4. Node latency comparison — per-node histogram quantiles\n5. Search overhead — Miroir vs. single-node Meilisearch ratio\n6. Task lag — stuck task age\n7. Shard distribution — imbalance detection\n8. Rebalance activity\n\nPlus conditional feature-flag-gated rows for:\n- §13.1 resharding in progress + phase gauge\n- §13.5 settings broadcast phase + drift repairs\n- §13.8 anti-entropy shards scanned, mismatches found, docs repaired\n- §13.13 CDC lag, buffer bytes, events by sink\n- §13.18 canary pass/fail heatmap\n- §13.21 search UI sessions + p95\n\n## Why\n\nPlan §10 + §12 list the dashboard as a delivered artifact. A sample dashboard shipped in the repo means operators don't reinvent it for each install — they import and customize.\n\n## Details\n\n**Prometheus data source**: parametrized via `$datasource` variable so operators point at their cluster's Prometheus.\n\n**Row visibility**: use Grafana's \"template variable\" controlling row visibility — set automatic via `enabled_feature` label on metrics (or via a separate `miroir_feature_enabled{feature}` gauge) so rows auto-show when scraped.\n\n**Timezone**: default `browser`; 1-minute refresh; 1-hour default time range.\n\n**Import flow**: `helm install` optional `dashboards.enabled: true` creates a ConfigMap with the JSON labeled `grafana_dashboard=1` so Grafana's sidecar auto-imports.\n\n## Acceptance\n\n- [ ] `dashboards/miroir-overview.json` imports into a stock Grafana v10.x without errors\n- [ ] Every panel renders data against a live Miroir scrape in Phase 9 integration cluster\n- [ ] Feature-gated rows hide when their metrics are absent; show when present","design":"","acceptance_criteria":"","notes":"","status":"open","priority":0,"issue_type":"task","created_at":"2026-04-18T21:42:04.502212851Z","created_by":"coding","updated_at":"2026-04-18T21:42:08.270363421Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase-7"],"dependencies":[{"issue_id":"miroir-afh.3","depends_on_id":"miroir-afh.1","type":"blocks","created_at":"2026-04-18T21:42:08.247243544Z","created_by":"coding","metadata":"{}","thread_id":""},{"issue_id":"miroir-afh.3","depends_on_id":"miroir-afh.2","type":"blocks","created_at":"2026-04-18T21:42:08.270326589Z","created_by":"coding","metadata":"{}","thread_id":""}]} {"id":"miroir-afh.4","title":"P7.4 ServiceMonitor + PrometheusRule (alerts) manifests","description":"## What\n\nShip the plan §10 + §14.9 alerting rules via `PrometheusRule` and the metric-scraping via `ServiceMonitor`.\n\n## ServiceMonitor (plan §10)\n\n```yaml\napiVersion: monitoring.coreos.com/v1\nkind: ServiceMonitor\nmetadata:\n name: miroir\nspec:\n selector: { matchLabels: { app.kubernetes.io/name: miroir, app.kubernetes.io/component: metrics } }\n endpoints:\n - port: metrics\n interval: 30s\n path: /metrics\n```\n\n## PrometheusRule (plan §10 + §14.9)\n\nAlerts (all 12 from plan):\n\n### Availability (plan §10)\n1. `MiroirDegradedShards` — `miroir_degraded_shards_total > 0` for 2m\n2. `MiroirNodeDown` — `miroir_node_healthy == 0` for 5m\n3. `MiroirHighSearchLatency` — p95 > 2s for 5m\n4. `MiroirTaskStuck` — `miroir_task_processing_age_seconds > 3600` for 10m\n5. `MiroirRebalanceStuck` — `miroir_rebalance_in_progress == 1` for 2h\n6. `MiroirSettingsDivergence` — paired with §13.5 auto-repair (plan §10 description)\n7. `MiroirAntientropyMismatch` — paired with §13.8 at 3 consecutive passes (~18h default schedule)\n\n### Resource pressure (plan §14.9)\n8. `MiroirMemoryPressure` — `miroir_memory_pressure >= 2` for 5m\n9. `MiroirRequestQueueBacklog` — `miroir_request_queue_depth > 500` for 2m\n10. `MiroirBackgroundJobBacklog` — `miroir_background_queue_depth > 100` for 10m\n11. `MiroirPeerDiscoveryGap` — peer mismatch for 2m\n12. `MiroirNoLeader` — `sum(miroir_leader) == 0` for 1m\n\n## Why\n\nAlert rules are part of the shipped product, not something operators have to write. Plan §10 is explicit: the rules fire \"only when the self-healing paths described [in §13.5 / §13.8] failed to close the gap on their own\" — so noise is minimized and every page is actionable.\n\n## Details\n\n**Helm flag**: `miroir.serviceMonitor.enabled: false` default (only render when operator opts in, requires prometheus-operator in cluster). Same for `miroir.prometheusRule.enabled: false`.\n\n**Alert routing**: operators wire to their own Alertmanager — Miroir doesn't ship routing config.\n\n## Acceptance\n\n- [ ] `helm template` with `serviceMonitor.enabled: true` renders a valid ServiceMonitor manifest\n- [ ] All 12 alerts present in the rendered PrometheusRule\n- [ ] Each alert tripped at least once in Phase 9 chaos tests (where applicable)","design":"","acceptance_criteria":"","notes":"","status":"open","priority":0,"issue_type":"task","created_at":"2026-04-18T21:42:04.550227072Z","created_by":"coding","updated_at":"2026-04-18T21:42:08.287321683Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase-7"],"dependencies":[{"issue_id":"miroir-afh.4","depends_on_id":"miroir-afh.1","type":"blocks","created_at":"2026-04-18T21:42:08.287293376Z","created_by":"coding","metadata":"{}","thread_id":""}]} @@ -54,14 +54,14 @@ {"id":"miroir-cdo.6","title":"P1.6 Property + benchmark tests for router (criterion + proptest)","description":"## What\n\n- `proptest`-based property tests for rendezvous: determinism, minimal reshuffling bounds, uniformity at various (S, Ng, RF) sizes\n- `criterion` benchmarks targeting the plan §8 goals:\n - Rendezvous assignment (64 shards, 3 nodes, 10K docs) < 1 ms total\n - Merger (1000 hits, 3 shards) < 1 ms\n\n## Why\n\nPlan §8 sets both as gates (\"A PR that increases measured search latency by > 20% over the previous release triggers a review comment\"). Having them live from Phase 1 means regression prevention starts with the first router change.\n\n## Details\n\n- Benches go in `crates/miroir-core/benches/`\n- Property tests go in `crates/miroir-core/tests/` or as `#[cfg(test)]` modules with `proptest!` macros\n- Use a `HashSet` diff to measure reshuffling; assert `|diff| <= 2 * ceil(S / (N+1))` for a node-add event\n\n## Acceptance\n\n- [ ] `cargo bench -p miroir-core` runs all criterion benches and reports timing\n- [ ] `cargo test -p miroir-core` runs property tests with 1024 cases per property (default proptest config)\n- [ ] Phase 8 CI includes `cargo bench --no-run` to compile benches on every build","design":"","acceptance_criteria":"","notes":"","status":"open","priority":1,"issue_type":"task","created_at":"2026-04-18T21:26:11.875805587Z","created_by":"coding","updated_at":"2026-05-22T18:43:42.341540028Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase-1"],"dependencies":[{"issue_id":"miroir-cdo.6","depends_on_id":"miroir-cdo.1","type":"blocks","created_at":"2026-04-18T21:26:21.615386498Z","created_by":"coding","metadata":"{}","thread_id":""},{"issue_id":"miroir-cdo.6","depends_on_id":"miroir-cdo.4","type":"blocks","created_at":"2026-04-18T21:26:21.629878965Z","created_by":"coding","metadata":"{}","thread_id":""}]} {"id":"miroir-m9q","title":"Phase 6 — Horizontal Scaling + HPA (§14)","description":"## Phase 6 Epic — Horizontal Scaling + HPA\n\nDelivers the §14 promise: **fixed per-pod envelope (2 vCPU / 3.75 GB), scale out never up**. Makes the request path strictly stateless and partitions background work across pods via one of three coordination modes.\n\n## Why This Is A Phase\n\nPlan §1 principle 8 + plan §14 are the architectural spine. Phase 2's proxy already runs on one pod; this phase makes N pods coherent. Every §13 feature's \"Scaling mode\" column in plan §14.6 gets wired up here — Phase 5's implementations have to already understand they'll run inside one of the three modes.\n\n## Scope\n\n**14.1–14.3 — Per-pod envelope**\n- `resources.requests` = 500m / 1Gi; `resources.limits` = 2000m / 3584Mi\n- Per-feature memory row validated against plan §14.2 budget\n- CPU budget per plan §14.3 (~3 kQPS/pod small responses)\n\n**14.4 — Request path HPA**\n- `autoscaling/v2` HPA on CPU 70%, memory 75%, `miroir_requests_in_flight` as `type: Pods` `AverageValue: 500`, `miroir_background_queue_depth` as `type: External` `Value: 10` (plan §14.4 note on metric types)\n- `prometheus-adapter` as a chart prerequisite when HPA is enabled\n- `values.schema.json` rejects `hpa.enabled=true` without `replicas >= 2 AND taskStore.backend = redis`\n\n**14.5 — Background coordination modes**\n- **Mode A — Shard-partitioned ownership** (anti-entropy §13.8, settings-drift check §13.5, task registry pruner, TTL sweeper §13.14, canary runner §13.18)\n- **Mode B — Leader-only lease** (reshard coordinator §13.1, rebalancer Phase 4, alias flip serializer §13.7, two-phase settings broadcast §13.5, ILM evaluator §13.17, scoped-key rotation leader §13.21)\n- **Mode C — Work-queued chunked jobs** (streaming dump import §13.9, large reshard backfill §13.1)\n- **Peer discovery** via headless Service (`miroir-headless`) + Downward API `POD_NAME`/`POD_IP`, 15s SRV refresh\n- Rendezvous over peer set for Mode A; `SET NX EX 10` renewed every 3s for Mode B\n- Job lease heartbeat every 10s with 30s timeout for Mode C\n\n**14.6 — Per-feature scaling-mode wiring** — 21 rows, each must compile against the chosen mode\n\n**14.7 — Deployment sizing matrix** — ops documentation/tooling surfacing orchestrator pod count vs. corpus × QPS tiers\n\n**14.8 — Resource-aware defaults** — every config knob's default sized for the envelope\n\n**14.9 — Resource-pressure metrics + alerts** — `miroir_memory_pressure`, `miroir_cpu_throttled_seconds_total`, `miroir_request_queue_depth`, `miroir_background_queue_depth{job_type}`, `miroir_peer_pod_count`, `miroir_leader`, `miroir_owned_shards_count`; PrometheusRule alerts\n\n**14.10 — Vertical-scaling escape valve** — documented as supported but not recommended; no implementation work, just docs\n\n## Definition of Done\n\n- [ ] Multi-pod deployment (replicas=3) — every pod independently serves requests with identical routing\n- [ ] Kill one of three pods mid-traffic — zero client-visible errors beyond retry budget (plan §8 chaos)\n- [ ] Mode A test: spin up 3 pods, anti-entropy runs exactly once per shard per interval cluster-wide\n- [ ] Mode B test: start 3 pods, exactly one holds the reshard lease at any given instant; killing it promotes another within `lease_ttl_s`\n- [ ] Mode C test: submit a 10GB dump; chunks distribute across 3 pods and HPA reacts to `miroir_background_queue_depth`\n- [ ] All §14.2 memory rows fit within 3584 MiB under realistic steady-state load\n- [ ] All §14.9 alerts present in the PrometheusRule manifest and trip under induced fault","design":"","acceptance_criteria":"","notes":"","status":"open","priority":0,"issue_type":"epic","created_at":"2026-04-18T21:21:13.549727274Z","created_by":"coding","updated_at":"2026-04-18T21:23:08.657411091Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase","phase-6"],"dependencies":[{"issue_id":"miroir-m9q","depends_on_id":"miroir-mkk","type":"blocks","created_at":"2026-04-18T21:23:08.657393466Z","created_by":"coding","metadata":"{}","thread_id":""},{"issue_id":"miroir-m9q","depends_on_id":"miroir-r3j","type":"blocks","created_at":"2026-04-18T21:23:08.646285774Z","created_by":"coding","metadata":"{}","thread_id":""}]} {"id":"miroir-m9q.1","title":"P6.1 Pod resource envelope + limits/requests","description":"## What\n\nImplement pod sizing per plan §14.1 + §14.2 + §14.8:\n- Helm `deployment.yaml` sets `resources.requests = {cpu: 500m, memory: 1Gi}`\n- `resources.limits = {cpu: 2000m, memory: 3584Mi}` (plan §14.8: \"leaves headroom under 3.75 GB node limit\")\n- Config defaults sized for the envelope (§14.8 full YAML)\n\n## Why\n\nPlan §1 principle 8: \"Fixed per-pod resource envelope (2 vCPU / 3.75 GB). When aggregate workload exceeds this envelope, scale **horizontally** by adding pods, never vertically beyond the envelope.\"\n\nWithout enforced limits, a runaway per-feature cache (e.g., session_pinning.max_sessions set unreasonably high) can push a pod into OOM-kill territory, inviting HPA to spin up replacements instead of surfacing the misconfiguration.\n\n## Details\n\n**Per-feature memory rows** (plan §14.2) each need their defaults:\n\n| Component | Budget | Knob |\n|-----------|--------|------|\n| Runtime + axum | 80 MB | — |\n| HTTP/2 pools | 50 MB | `connection_pool_per_node` |\n| Req/resp buffers | 200 MB | `server.max_body_bytes`, `max_concurrent_requests` |\n| Task registry | 100 MB | `task_registry.cache_size` |\n| Idempotency | 100 MB | `idempotency.max_cached_keys` |\n| Sessions | 50 MB | `session_pinning.max_sessions` |\n| Coalescing | 50 MB | `query_coalescing.max_subscribers` |\n| Router + EWMA | 20 MB | fixed |\n| Plan cache | 20 MB | fixed |\n| Alias table | 10 MB | fixed |\n| Metrics | 50 MB | fixed |\n| Dump import buffer | 128 MB | `dump_import.memory_buffer_bytes` (only during import) |\n| Anti-entropy | 128 MB | `anti_entropy.max_read_concurrency` (only during pass) |\n| Multi-search scratch | 5 MB | `multi_search.max_queries_per_batch` |\n| Vector over-fetch | 30 MB | `vector_search.over_fetch_factor` |\n| CDC buffer | 64 MB | `cdc.buffer.memory_bytes` |\n| TTL cursor | 5 MB | — |\n| Tenant map LRU | 20 MB | `tenant_affinity.mode` |\n| Shadow tee | ~50 MB | `shadow.targets[].sample_rate` |\n| Canary state | 20 MB | `canary_runner.run_history_per_canary` |\n| Admin UI assets | 10 MB | fixed |\n| Explain cache | 10 MB | fixed |\n| Search UI assets | 10 MB | fixed |\n| Search UI rate limiter | 20 MB (Redis-backed) | — |\n| Allocator overhead | 800 MB | — |\n| **Steady-state total** | **~1.2 GB** | |\n\n**Regression budget**: add a CI check (Phase 9) that flags when steady-state under synthetic load exceeds 1.7 GB.\n\n## Acceptance\n\n- [ ] Helm rendered manifest matches the requests/limits above\n- [ ] Idle pod < 300 MB RSS on a 3-node cluster\n- [ ] Steady-state (1 kQPS across 3 Miroir pods) under 1.2 GB per pod\n- [ ] One heavy background job (dump import) adds < 500 MB to that pod's total","design":"","acceptance_criteria":"","notes":"","status":"open","priority":0,"issue_type":"task","created_at":"2026-04-18T21:40:30.562386308Z","created_by":"coding","updated_at":"2026-04-18T21:40:30.562386308Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase-6"]} -{"id":"miroir-m9q.2","title":"P6.2 Peer discovery via headless Service + Downward API","description":"## What\n\nImplement peer discovery per plan §14.5:\n- Helm `miroir-headless.yaml` — a headless Service with label selector on the Deployment\n- Deployment: Downward API injects `POD_NAME` + `POD_IP` as env vars\n- Each pod refreshes peer set every `peer_discovery.refresh_interval_s` (default 15s) via SRV lookup against `miroir-headless..svc.cluster.local`\n- Peer set is `Vec` where `PeerId = POD_NAME` — used by rendezvous for Mode A ownership\n\n## Why\n\nPlan §14.5: \"All three modes rely on the current peer set.\" Mode A rendezvous partitions by peer × work-item; Mode B leader election picks one peer; Mode C claim lease is by peer. Without a peer set, we'd need either a central registry (new dependency) or K8s API calls (requires RBAC + API server load).\n\nSRV-based discovery is zero-config — if headless Service exists, it just works.\n\n## Details\n\n**Manifest** (plan §14.5 + §6):\n```yaml\napiVersion: v1\nkind: Service\nmetadata:\n name: miroir-headless\nspec:\n clusterIP: None\n selector:\n app.kubernetes.io/name: miroir\n ports: [...]\n```\n\n**Env injection** (plan §14.5 \"Peer discovery\"):\n```yaml\nenv:\n- name: POD_NAME\n valueFrom: { fieldRef: { fieldPath: metadata.name } }\n- name: POD_IP\n valueFrom: { fieldRef: { fieldPath: status.podIP } }\n```\n\n**Rust side**:\n```rust\npub struct PeerSet { pub peers: Vec, pub refreshed_at: Instant }\npub async fn refresh_peers(service: &str) -> PeerSet { /* SRV lookup */ }\n```\n\n**Transient double-work** is acceptable (plan §14.5): \"15-second discovery window is harmless: anti-entropy is idempotent, settings-repair is idempotent.\"\n\n## Acceptance\n\n- [ ] 3-pod deployment: each pod sees all 3 peer names within 30s of last pod ready\n- [ ] Scale 3→5: new peers discovered within `refresh_interval_s × 2`\n- [ ] Pod eviction: crashed pod drops from peer set within `refresh_interval_s × 2`\n- [ ] `miroir_peer_pod_count` gauge matches `kube_deployment_status_replicas_ready`","design":"","acceptance_criteria":"","notes":"","status":"open","priority":0,"issue_type":"task","assignee":"","created_at":"2026-04-18T21:40:30.582753605Z","created_by":"coding","updated_at":"2026-05-23T05:14:22.686031337Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase-6"]} +{"id":"miroir-m9q.2","title":"P6.2 Peer discovery via headless Service + Downward API","description":"## What\n\nImplement peer discovery per plan §14.5:\n- Helm `miroir-headless.yaml` — a headless Service with label selector on the Deployment\n- Deployment: Downward API injects `POD_NAME` + `POD_IP` as env vars\n- Each pod refreshes peer set every `peer_discovery.refresh_interval_s` (default 15s) via SRV lookup against `miroir-headless..svc.cluster.local`\n- Peer set is `Vec` where `PeerId = POD_NAME` — used by rendezvous for Mode A ownership\n\n## Why\n\nPlan §14.5: \"All three modes rely on the current peer set.\" Mode A rendezvous partitions by peer × work-item; Mode B leader election picks one peer; Mode C claim lease is by peer. Without a peer set, we'd need either a central registry (new dependency) or K8s API calls (requires RBAC + API server load).\n\nSRV-based discovery is zero-config — if headless Service exists, it just works.\n\n## Details\n\n**Manifest** (plan §14.5 + §6):\n```yaml\napiVersion: v1\nkind: Service\nmetadata:\n name: miroir-headless\nspec:\n clusterIP: None\n selector:\n app.kubernetes.io/name: miroir\n ports: [...]\n```\n\n**Env injection** (plan §14.5 \"Peer discovery\"):\n```yaml\nenv:\n- name: POD_NAME\n valueFrom: { fieldRef: { fieldPath: metadata.name } }\n- name: POD_IP\n valueFrom: { fieldRef: { fieldPath: status.podIP } }\n```\n\n**Rust side**:\n```rust\npub struct PeerSet { pub peers: Vec, pub refreshed_at: Instant }\npub async fn refresh_peers(service: &str) -> PeerSet { /* SRV lookup */ }\n```\n\n**Transient double-work** is acceptable (plan §14.5): \"15-second discovery window is harmless: anti-entropy is idempotent, settings-repair is idempotent.\"\n\n## Acceptance\n\n- [ ] 3-pod deployment: each pod sees all 3 peer names within 30s of last pod ready\n- [ ] Scale 3→5: new peers discovered within `refresh_interval_s × 2`\n- [ ] Pod eviction: crashed pod drops from peer set within `refresh_interval_s × 2`\n- [ ] `miroir_peer_pod_count` gauge matches `kube_deployment_status_replicas_ready`","design":"","acceptance_criteria":"","notes":"","status":"in_progress","priority":0,"issue_type":"task","assignee":"claude-code-glm-4.7-echo","created_at":"2026-04-18T21:40:30.582753605Z","created_by":"coding","updated_at":"2026-05-23T06:49:36.363809548Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase-6"]} {"id":"miroir-m9q.3","title":"P6.3 Mode A: shard-partitioned ownership (anti-entropy, drift, TTL, canaries, pruner)","description":"## What\n\nImplement plan §14.5 Mode A rendezvous-partitioned ownership:\n```\nowns(shard_or_item, pod) = pod == top1_by_score(hash(item || pid) for pid in peer_set)\n```\n\nApplied to:\n- §13.8 anti-entropy reconciler — each pod fingerprints/repairs owned shards\n- §13.5 settings drift checker — each pod polls subset of (index, node) settings-hash pairs\n- Task registry pruner — each pod prunes tasks it owns by `top1_by_score(hash(miroir_id || pid))`\n- §13.14 TTL sweeper — each pod sweeps owned shards\n- §13.18 canary runner — each canary ID rendezvous-owned by one pod per interval\n\n## Why\n\nPlan §14.5: \"No explicit handoff — the new owner runs the next scheduled pass. Transient double-work during a 15-second discovery window is harmless.\" Mode A is naturally horizontal (work scales with peer count) and idempotent (safe during rescheduling).\n\n## Details\n\n**Ownership function** (reuses Phase 1 `score` with item:pod keys instead of shard:node):\n```rust\npub fn owns(item: &T, self_pod: &PeerId, peers: &[PeerId]) -> bool {\n peers.iter()\n .max_by_key(|pid| score_item_peer(item, pid))\n .map_or(false, |top| top == self_pod)\n}\n```\n\n**Scheduled runs**: each Mode A worker is a tokio task with a tick interval. On tick:\n1. Refresh peer set\n2. For each eligible item, check `owns(item, self)` and process if so\n3. Record progress per-item so rescheduling mid-run resumes cleanly\n\n**Phase 5 integration**: each §13.x subsection that declared \"Mode A\" in plan §14.6 calls into this layer rather than implementing its own peer-partitioning.\n\n## Acceptance\n\n- [ ] 3 pods running anti-entropy: each shard processed exactly once per interval cluster-wide\n- [ ] Kill one pod mid-pass: its shards reassigned to other peers within `refresh_interval_s × 2`; no shard processed by two pods simultaneously beyond the 15s window\n- [ ] Unit test: `owns()` returns true for exactly one peer per item across the peer set\n- [ ] Integration: induce divergence; Mode A anti-entropy converges across 3 pods with no double-repair","design":"","acceptance_criteria":"","notes":"","status":"open","priority":0,"issue_type":"task","created_at":"2026-04-18T21:40:30.605342882Z","created_by":"coding","updated_at":"2026-04-18T21:40:36.034993157Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase-6"],"dependencies":[{"issue_id":"miroir-m9q.3","depends_on_id":"miroir-m9q.2","type":"blocks","created_at":"2026-04-18T21:40:36.034974102Z","created_by":"coding","metadata":"{}","thread_id":""}],"comments":[{"id":2,"issue_id":"miroir-m9q.3","author":"cli","text":"## Related documentation\n\n- [Per-Feature Scaling Behavior](https://github.com/jedarden/miroir/blob/main/docs/horizontal-scaling/per-feature.md) — Full mapping of all §13.x features to scaling modes (A/B/C/stateless)\n- [Plan §14.5](https://github.com/jedarden/miroir/blob/main/docs/plan/plan.md#145-horizontal-scaling-background-work) — Mode A/B/C implementation details\n","created_at":"2026-05-20T10:53:12.916846335Z"},{"id":5,"issue_id":"miroir-m9q.3","author":"cli","text":"Cross-reference: See [Per-Feature Scaling Behavior](https://github.com/jedarden/miroir/blob/main/docs/horizontal-scaling/per-feature.md) for the complete mapping of §13.x capabilities to scaling modes. This bead implements Mode A (shard-partitioned ownership) for anti-entropy, drift checking, TTL sweeper, and canary runner.","created_at":"2026-05-20T10:58:15.476718864Z"},{"id":8,"issue_id":"miroir-m9q.3","author":"cli","text":"Cross-reference: [Per-Feature Scaling Behavior](docs/horizontal-scaling/per-feature.md) documents the full mapping of all §13.x capabilities to their scaling modes (A/B/C/stateless/per-pod).","created_at":"2026-05-20T11:12:19.649912904Z"}]} {"id":"miroir-m9q.4","title":"P6.4 Mode B: leader-only singleton coordinator (reshard, rebalance, alias flip, 2PC, ILM, scoped-key rotation)","description":"## What\n\nImplement plan §14.5 Mode B leader-only lease:\n- SQLite: advisory lock row in `leader_lease` (plan §4) — the lease holder is recorded so recovery reads the last committed phase state\n- Redis: `SET NX EX 10` renewed every 3s\n- Leader-loss mid-operation: pause; new leader reads persisted phase state and resumes at the last committed phase boundary\n- All Mode B operations are designed to be **idempotent** and safe to resume at phase boundaries\n\nLease scopes (plan §14.6):\n- §13.1 reshard coordinator: `reshard:`\n- Phase 4 rebalancer: `rebalance:` (or global `rebalance`)\n- §13.7 alias flip serializer: `alias_flip:`\n- §13.5 two-phase settings broadcast: `settings_broadcast:`\n- §13.17 ILM evaluator: `ilm`\n- §13.21 scoped-key rotation: `search_ui_key_rotation:`\n\n## Why\n\nPlan §14.5: \"Leader loss mid-operation causes a pause; the new leader reads the persisted phase state from the task store and resumes from the last committed phase. All operations are idempotent by design and safe to resume at any phase boundary.\"\n\nWithout lease-based coordination, two pods could each run a reshard on the same index simultaneously → double shadow creation, conflicting alias flips, data corruption.\n\n## Details\n\n**Lease renewal**: every 3s (`leader_election.renew_interval_s`); TTL 10s (`leader_election.lease_ttl_s`). If renewal fails, leader gives up voluntarily to reduce split-brain.\n\n**Phase state persistence**: each Mode B operation persists enough state after each phase so resumption picks up where the dead leader left off:\n- Reshard: current phase ∈ {shadow, backfill, verify, swap, cleanup} + per-shard cursor\n- 2PC broadcast: current phase ∈ {propose, verify, commit} + per-node ACK list\n- ILM: per-policy next-check-time + in-flight rollover state\n\n**Config**:\n```yaml\nleader_election:\n enabled: true # auto-true when replicas > 1\n lease_ttl_s: 10\n renew_interval_s: 3\n```\n\n**SQLite substitute**: for single-pod dev, the `leader_lease` row is still written (so recovery can read the last committed phase state after a crash); lease semantics reduced to \"always-leader.\"\n\n**Metrics**: `miroir_leader` gauge (1 if this pod is leader, 0 otherwise).\n\n## Acceptance\n\n- [ ] 3 pods: exactly one is leader at any instant; killing it promotes another within `lease_ttl_s`\n- [ ] Kill the leader during reshard phase 3 (verify); new leader resumes at phase 3, not phase 1\n- [ ] Kill the leader during 2PC phase 2 (verify); new leader resumes verify without re-applying phase 1\n- [ ] `miroir_leader` sum across all pods is always 1 (or 0 transiently during failover)","design":"","acceptance_criteria":"","notes":"","status":"open","priority":0,"issue_type":"task","created_at":"2026-04-18T21:40:30.638856024Z","created_by":"coding","updated_at":"2026-04-18T21:40:36.064313963Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase-6"],"dependencies":[{"issue_id":"miroir-m9q.4","depends_on_id":"miroir-m9q.2","type":"blocks","created_at":"2026-04-18T21:40:36.064226657Z","created_by":"coding","metadata":"{}","thread_id":""}],"comments":[{"id":3,"issue_id":"miroir-m9q.4","author":"cli","text":"## Related documentation\n\n- [Per-Feature Scaling Behavior](https://github.com/jedarden/miroir/blob/main/docs/horizontal-scaling/per-feature.md) — Full mapping of all §13.x features to scaling modes (A/B/C/stateless)\n- [Plan §14.5](https://github.com/jedarden/miroir/blob/main/docs/plan/plan.md#145-horizontal-scaling-background-work) — Mode A/B/C implementation details\n","created_at":"2026-05-20T10:53:12.939925852Z"},{"id":6,"issue_id":"miroir-m9q.4","author":"cli","text":"Cross-reference: See [Per-Feature Scaling Behavior](https://github.com/jedarden/miroir/blob/main/docs/horizontal-scaling/per-feature.md) for the complete mapping of §13.x capabilities to scaling modes. This bead implements Mode B (leader-only singleton coordinator) for reshard, rebalance, alias flip, 2PC, ILM, and scoped-key rotation.","created_at":"2026-05-20T10:58:15.503766257Z"},{"id":9,"issue_id":"miroir-m9q.4","author":"cli","text":"Cross-reference: [Per-Feature Scaling Behavior](docs/horizontal-scaling/per-feature.md) documents the full mapping of all §13.x capabilities to their scaling modes (A/B/C/stateless/per-pod).","created_at":"2026-05-20T11:12:19.668827583Z"}]} {"id":"miroir-m9q.5","title":"P6.5 Mode C: work-queued chunked jobs (dump import, reshard backfill)","description":"## What\n\nImplement plan §14.5 Mode C work-queued chunked jobs:\n- `jobs` table (Phase 3) with states `queued | in_progress | completed | failed`\n- Any pod can `claim_job(pod_id)` — atomic compare-and-swap `claimed_by IS NULL → claimed_by = pod_id`\n- Claim TTL: `claim_expires_at`, heartbeat every 10s, timeout 30s — pod loss → claim expires → another picks up\n- Large jobs **split into chunks** on input boundaries by the first pod that picks them up\n- Per-chunk progress persisted so crashed claims resume at last committed offset (idempotent via primary keys)\n\nApplied to:\n- §13.9 streaming dump import — chunks on NDJSON line boundaries, `chunk_size_bytes` default 256 MiB\n- §13.1 reshard backfill — partitions by shard-id range\n\n## Why\n\nPlan §14.5: \"Heavy streaming operations can exceed a single pod's envelope.\" A 500 GB dump is easily 10× a pod's memory budget — must chunk.\n\nPlan §14.4 HPA: `miroir_background_queue_depth` gauge → HPA scales out when backlog grows; scales back in when drained.\n\n## Details\n\n**Chunking**: first pod that picks up a large job inspects the input, computes split points, and re-enqueues per-chunk jobs. Original job transitions to `in_progress` with progress = \"splitting\" → \"delegated\" when chunks enqueued.\n\n**Claim heartbeat**: `UPDATE jobs SET claim_expires_at = now + 30s WHERE id = ? AND claimed_by = ?` — succeeds only if we still hold it. Pod crash → no heartbeat → next lease expiry releases claim.\n\n**Idempotent resume**: chunks record `{bytes_processed, docs_routed, last_cursor}`. A resumed chunk starts at `last_cursor` and re-writes docs (PK-idempotent at Meilisearch level → no dupes).\n\n**Queue depth metric**: `miroir:jobs:_queued` set; `SCARD miroir:jobs:_queued` = `miroir_background_queue_depth`. Fed to HPA as external metric per plan §14.4.\n\n**Config** tied to §13.9:\n```yaml\ndump_import:\n chunk_size_bytes: 268435456 # 256 MiB per §14.5 Mode C chunk-parallel coordinator\n```\n\n## Acceptance\n\n- [ ] 1 GB dump: first pod splits into 4× 256 MiB chunks; 3 pods claim 3 of 4 chunks in parallel; queue drains\n- [ ] Kill a claimant mid-chunk: claim expires in 30s; another pod picks up and resumes at `last_cursor`\n- [ ] HPA on `miroir_background_queue_depth > 10` triggers scale-up during the burst; scale-down once empty\n- [ ] Two concurrent dumps: chunks from both interleave in claims; neither starves","design":"","acceptance_criteria":"","notes":"","status":"open","priority":0,"issue_type":"task","created_at":"2026-04-18T21:40:30.654570336Z","created_by":"coding","updated_at":"2026-04-18T21:40:36.099963727Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase-6"],"dependencies":[{"issue_id":"miroir-m9q.5","depends_on_id":"miroir-m9q.2","type":"blocks","created_at":"2026-04-18T21:40:36.099899160Z","created_by":"coding","metadata":"{}","thread_id":""}],"comments":[{"id":4,"issue_id":"miroir-m9q.5","author":"cli","text":"## Related documentation\n\n- [Per-Feature Scaling Behavior](https://github.com/jedarden/miroir/blob/main/docs/horizontal-scaling/per-feature.md) — Full mapping of all §13.x features to scaling modes (A/B/C/stateless)\n- [Plan §14.5](https://github.com/jedarden/miroir/blob/main/docs/plan/plan.md#145-horizontal-scaling-background-work) — Mode A/B/C implementation details\n","created_at":"2026-05-20T10:53:12.950953124Z"},{"id":7,"issue_id":"miroir-m9q.5","author":"cli","text":"Cross-reference: See [Per-Feature Scaling Behavior](https://github.com/jedarden/miroir/blob/main/docs/horizontal-scaling/per-feature.md) for the complete mapping of §13.x capabilities to scaling modes. This bead implements Mode C (work-queued chunked jobs) for dump import and reshard backfill.","created_at":"2026-05-20T10:58:15.518343138Z"},{"id":10,"issue_id":"miroir-m9q.5","author":"cli","text":"Cross-reference: [Per-Feature Scaling Behavior](docs/horizontal-scaling/per-feature.md) documents the full mapping of all §13.x capabilities to their scaling modes (A/B/C/stateless/per-pod).","created_at":"2026-05-20T11:12:19.680451775Z"}]} {"id":"miroir-m9q.6","title":"P6.6 HPA spec + prometheus-adapter + schema validation","description":"## What\n\nShip the HPA spec (plan §14.4):\n```yaml\napiVersion: autoscaling/v2\nkind: HorizontalPodAutoscaler\nspec:\n minReplicas: 2\n maxReplicas: 24\n behavior:\n scaleDown: { stabilizationWindowSeconds: 300 }\n scaleUp: { stabilizationWindowSeconds: 30 }\n metrics:\n - Resource cpu 70%\n - Resource memory 75%\n - Pods miroir_requests_in_flight AverageValue: 500\n - External miroir_background_queue_depth Value: 10\n```\n\nChart preconditions enforced via `values.schema.json`:\n- `hpa.enabled: true` requires `replicas >= 2 AND taskStore.backend: redis`\n- `prometheus-adapter` (or equivalent) as a documented prerequisite when HPA is enabled\n\n## Why\n\nPlan §14.4: \"`miroir_requests_in_flight` is **per-pod** and uses `type: Pods`. `miroir_background_queue_depth` is **global** and must use `type: External` with `type: Value`.\" Getting the metric type wrong produces a pathological HPA that monotonically scales to `maxReplicas`.\n\n## Details\n\n**Per-workload-tier min/max** (plan §14.7):\n| Peak QPS | minReplicas | maxReplicas |\n|---|---|---|\n| ≤ 500 | 2 | 3 |\n| ≤ 2k | 2 | 4 |\n| ≤ 5k | 4 | 8 |\n| ≤ 20k | 8 | 12 |\n| ≤ 100k | 12 | 24 |\n\nDefault values.yaml ships the ≤ 5k tier; operators override per workload.\n\n**prometheus-adapter config**: add a ConfigMap-defined `rules.externalMetrics` entry mapping `miroir_background_queue_depth` to the external metrics API. This is NOT shipped by the Miroir chart (operators install prometheus-adapter separately); the chart's `NOTES.txt` calls it out.\n\n**Stabilization windows**: scale-up fast (30s), scale-down slow (300s). Avoids pod flapping.\n\n## Acceptance\n\n- [ ] `helm lint --strict` with `hpa.enabled: true + replicas: 1` → fails with schema error\n- [ ] `helm lint --strict` with `hpa.enabled: true + replicas: 2 + backend: sqlite` → fails\n- [ ] HPA in a kind cluster: induce CPU load → scales up within 30s; load drops → scales down after 300s\n- [ ] External metric binding: `miroir_background_queue_depth` visible via `kubectl get --raw /apis/external.metrics.k8s.io/v1beta1/...`","design":"","acceptance_criteria":"","notes":"","status":"open","priority":0,"issue_type":"task","created_at":"2026-04-18T21:40:30.676597441Z","created_by":"coding","updated_at":"2026-04-18T21:40:36.163090876Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase-6"],"dependencies":[{"issue_id":"miroir-m9q.6","depends_on_id":"miroir-m9q.4","type":"blocks","created_at":"2026-04-18T21:40:36.140248526Z","created_by":"coding","metadata":"{}","thread_id":""},{"issue_id":"miroir-m9q.6","depends_on_id":"miroir-m9q.5","type":"blocks","created_at":"2026-04-18T21:40:36.163063693Z","created_by":"coding","metadata":"{}","thread_id":""}]} {"id":"miroir-m9q.7","title":"P6.7 Resource-pressure metrics + alerts (§14.9)","description":"## What\n\nRegister the plan §14.9 resource-pressure metrics:\n- `miroir_memory_pressure` gauge (0=ok, 1=warn >75%, 2=critical >90%)\n- `miroir_cpu_throttled_seconds_total` counter (cgroup throttling)\n- `miroir_request_queue_depth` gauge\n- `miroir_background_queue_depth{job_type}` gauge\n- `miroir_peer_pod_count` gauge\n- `miroir_leader` gauge\n- `miroir_owned_shards_count` gauge\n\nAnd the associated `PrometheusRule` alerts (plan §14.9).\n\n## Why\n\nThese surface under-scaling BEFORE user-visible impact. `miroir_memory_pressure` + `MiroirMemoryPressure` alert give operators (and HPA) a leading indicator instead of waiting for OOM-kill.\n\n## Details\n\n**cgroup reads**: on Linux, read `/sys/fs/cgroup/cpu.stat` (cgroup v2) or `/sys/fs/cgroup/cpu/cpu.stat` (v1) for `nr_throttled`/`throttled_time`. Convert throttled_time nanoseconds → seconds for the counter.\n\n**Memory pressure gauge**: read `/sys/fs/cgroup/memory.current` + `memory.max`; compute utilization; map to 0/1/2 per threshold.\n\n**PrometheusRule**:\n```yaml\n- alert: MiroirMemoryPressure\n expr: miroir_memory_pressure >= 2\n for: 5m\n- alert: MiroirRequestQueueBacklog\n expr: miroir_request_queue_depth > 500\n for: 2m\n- alert: MiroirBackgroundJobBacklog\n expr: miroir_background_queue_depth > 100\n for: 10m\n- alert: MiroirPeerDiscoveryGap\n expr: miroir_peer_pod_count < kube_deployment_status_replicas_ready{deployment=\"miroir\"}\n for: 2m\n- alert: MiroirNoLeader\n expr: sum(miroir_leader) == 0\n for: 1m\n```\n\n## Acceptance\n\n- [ ] All 7 metrics present on `:9090/metrics`\n- [ ] `miroir_memory_pressure` reports 2 when artificial allocation pushes RSS > 90% of limit\n- [ ] `MiroirNoLeader` fires after killing the leader without replacement within 1 min\n- [ ] `MiroirPeerDiscoveryGap` fires if headless Service misconfigured","design":"","acceptance_criteria":"","notes":"","status":"open","priority":1,"issue_type":"task","created_at":"2026-04-18T21:40:30.711963985Z","created_by":"coding","updated_at":"2026-04-18T21:40:30.711963985Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase-6"]} {"id":"miroir-mkk","title":"Phase 4 — Topology Operations (rebalance, add/remove node + group, drain)","description":"## Phase 4 Epic — Topology Operations\n\nMakes the cluster *elastic*: operators can add or remove nodes within a group (capacity scaling) or add/remove entire replica groups (throughput scaling) without a full reindex and without downtime.\n\n## Why This Matters\n\nPlan §2 \"Topology changes\" and §4 \"Rebalancer\" together are **the** operational differentiator. Without this phase, Miroir is a static sharder — useful but not production-grade. Elasticity is what justifies the complexity of the whole system.\n\nPlan §15 Open Problem 1 (dual-write race) is partially mitigated by careful sequencing here and fully closed by §13.8 anti-entropy in Phase 5. Getting the sequencing right here means Phase 5's reconciler is a safety net, not the primary correctness mechanism.\n\n## Scope\n\n**Node addition (within a group; plan §2 \"Adding a node\")**\n\n1. Assign new node to a group; mark `joining`\n2. Recompute assignments — ~S/(Ng+1) shards move\n3. Dual-write: new inbound writes for affected shards go to **both** old owner and new node\n4. Background migration per shard: `GET /indexes/{uid}/documents?filter=_miroir_shard={id}&limit=1000&offset=...` → write each page to new node\n5. Mark `active`; stop dual-write; `POST /indexes/{uid}/documents/delete` with `filter=_miroir_shard={id}` on old owner\n\n**Replica-group addition (plan §2 \"Adding a new replica group\")** — mark `initializing`, background-sync from any healthy group using the same `_miroir_shard` filter, then flip to `active` and start routing queries.\n\n**Node removal (plan §2 \"Removing a node\")** — mark `draining`, recompute, migrate ~RF/Ng fraction to survivors, mark `removed`, operator deletes PVC.\n\n**Group removal (plan §2 \"Removing a replica group\")** — mark `draining`, stop routing queries; no data migration (other groups hold the docs); decommission.\n\n**Unplanned node failure (plan §2 \"Node failure\")** — mark `failed`; surviving intra-group replicas cover if RF>1; cross-group fallback if RF=1; schedule background replication to restore RF.\n\n**Admin API** (plan §4 admin table) — `POST /_miroir/nodes`, `DELETE /_miroir/nodes/{id}`, `POST /_miroir/nodes/{id}/drain`, `POST /_miroir/rebalance`, `GET /_miroir/rebalance/status`.\n\n## Design Notes\n\n- Relies on `_miroir_shard` being `filterable` on every node — set by Phase 2 index-create broadcast\n- Only one rebalance at a time per index (advisory lock → Phase 6 Mode B leader lease)\n- Chunked migration bounded by `rebalancer.max_concurrent_migrations` (default 4) to stay under the per-pod 3.75 GB envelope\n- Migration progress reported via `GET /_miroir/rebalance/status` and `miroir_rebalance_*` metrics (§10)\n- No full-corpus scans ever — the `_miroir_shard` filter is the key primitive; any code path that enumerates \"all docs\" is a bug\n\n## Open Problem Closure\n\nPlan §15 #1 — dual-write cutover race: document the exact sequencing here and note that §13.8 anti-entropy is the guaranteed safety net on the next pass.\n\n## Definition of Done\n\n- [ ] Chaos test: add a node mid-indexing — every doc remains readable; no duplicates on a subsequent search\n- [ ] Chaos test: drain a node while queries are in flight — zero client-visible failures; `X-Miroir-Degraded` absent or transient only\n- [ ] Chaos test: add a replica group while queries are in flight — existing groups unaffected; new group starts serving reads only after sync completes\n- [ ] Rebalance of a 3→4 node cluster moves ≤ 2×(1/4) of docs (optimal per plan §8 benches)\n- [ ] Restart a killed node mid-rebalance — rebalance pauses + resumes; no data loss","design":"","acceptance_criteria":"","notes":"","status":"open","priority":0,"issue_type":"epic","assignee":"","created_at":"2026-04-18T21:19:53.993012197Z","created_by":"coding","updated_at":"2026-05-09T16:11:31.984602638Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase","phase-4"],"dependencies":[{"issue_id":"miroir-mkk","depends_on_id":"miroir-9dj","type":"blocks","created_at":"2026-04-18T21:23:08.595905334Z","created_by":"coding","metadata":"{}","thread_id":""},{"issue_id":"miroir-mkk","depends_on_id":"miroir-r3j","type":"blocks","created_at":"2026-04-18T21:23:08.609300009Z","created_by":"coding","metadata":"{}","thread_id":""}]} -{"id":"miroir-mkk.1","title":"P4.1 Rebalancer background worker + advisory lock","description":"## What\n\nImplement the rebalancer as a background Tokio task (plan §4 \"Rebalancer\"):\n- Advisory lock — only one Miroir instance runs the rebalancer at a time (Phase 6 §14.5 Mode B replaces with leader lease)\n- Reacts to topology change events (node add/drain/fail/recover) from the admin API + health checker\n- Computes affected shards (the `~S/(Ng+1)` or `~RF/Ng` delta) using the Phase 1 router\n- Drives the migration state machine for each affected shard\n- Updates `miroir_rebalance_in_progress`, `miroir_rebalance_documents_migrated_total`, `miroir_rebalance_duration_seconds` (plan §10)\n\n## Why\n\nThe rebalancer is the orchestrator of all Phase 4 operations. Everything else in this phase is a subroutine called by this worker. Keeping it as a dedicated task — rather than inline in admin handlers — means a slow migration doesn't block admin API responses and a crash restarts cleanly from the task-store state.\n\n## Details\n\n**State machine per-shard**:\n```\nIdle → DualWriteStarted → MigrationInProgress → MigrationComplete → DualWriteStopped → OldReplicaDeleted → Idle\n```\n\n**Concurrency bound**: `rebalancer.max_concurrent_migrations` (default 4) to stay within plan §14.2 memory budget for migration buffers.\n\n**Progress persistence**: per-shard cursor in `jobs` table (Phase 3) so a pod restart resumes at the last committed offset. Idempotent per primary key (same doc re-written on resume is no-op at Meilisearch level).\n\n**Cancellation**: an admin API call can pause (not delete) an in-progress rebalance; resuming picks up at the persisted cursor.\n\n## Acceptance\n\n- [ ] Advisory lock: two pods running the rebalancer simultaneously produce 0 duplicate migrations (enforced via the `leader_lease` row for scope `rebalance:`)\n- [ ] Progress persistence: kill the pod mid-migration; another takes over within lease TTL and completes without starting over\n- [ ] Metrics tick: `miroir_rebalance_documents_migrated_total` monotonically increases; `_duration_seconds` histogram records per-shard migration time","design":"","acceptance_criteria":"","notes":"","status":"in_progress","priority":0,"issue_type":"task","assignee":"claude-code-glm-4.7-bravo","created_at":"2026-04-18T21:31:43.768256172Z","created_by":"coding","updated_at":"2026-05-23T06:06:46.486781448Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase-4"]} +{"id":"miroir-mkk.1","title":"P4.1 Rebalancer background worker + advisory lock","description":"## What\n\nImplement the rebalancer as a background Tokio task (plan §4 \"Rebalancer\"):\n- Advisory lock — only one Miroir instance runs the rebalancer at a time (Phase 6 §14.5 Mode B replaces with leader lease)\n- Reacts to topology change events (node add/drain/fail/recover) from the admin API + health checker\n- Computes affected shards (the `~S/(Ng+1)` or `~RF/Ng` delta) using the Phase 1 router\n- Drives the migration state machine for each affected shard\n- Updates `miroir_rebalance_in_progress`, `miroir_rebalance_documents_migrated_total`, `miroir_rebalance_duration_seconds` (plan §10)\n\n## Why\n\nThe rebalancer is the orchestrator of all Phase 4 operations. Everything else in this phase is a subroutine called by this worker. Keeping it as a dedicated task — rather than inline in admin handlers — means a slow migration doesn't block admin API responses and a crash restarts cleanly from the task-store state.\n\n## Details\n\n**State machine per-shard**:\n```\nIdle → DualWriteStarted → MigrationInProgress → MigrationComplete → DualWriteStopped → OldReplicaDeleted → Idle\n```\n\n**Concurrency bound**: `rebalancer.max_concurrent_migrations` (default 4) to stay within plan §14.2 memory budget for migration buffers.\n\n**Progress persistence**: per-shard cursor in `jobs` table (Phase 3) so a pod restart resumes at the last committed offset. Idempotent per primary key (same doc re-written on resume is no-op at Meilisearch level).\n\n**Cancellation**: an admin API call can pause (not delete) an in-progress rebalance; resuming picks up at the persisted cursor.\n\n## Acceptance\n\n- [ ] Advisory lock: two pods running the rebalancer simultaneously produce 0 duplicate migrations (enforced via the `leader_lease` row for scope `rebalance:`)\n- [ ] Progress persistence: kill the pod mid-migration; another takes over within lease TTL and completes without starting over\n- [ ] Metrics tick: `miroir_rebalance_documents_migrated_total` monotonically increases; `_duration_seconds` histogram records per-shard migration time","design":"","acceptance_criteria":"","notes":"","status":"in_progress","priority":0,"issue_type":"task","assignee":"claude-code-glm-4.7-bravo","created_at":"2026-04-18T21:31:43.768256172Z","created_by":"coding","updated_at":"2026-05-23T06:46:47.198762008Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase-4"]} {"id":"miroir-mkk.2","title":"P4.2 Node addition: dual-write + paginated shard migration","description":"## What\n\nImplement the node-addition flow from plan §2 \"Adding a node to an existing group\":\n1. Admin API: `POST /_miroir/nodes` body `{\"id\": \"meili-N\", \"address\": \"...\", \"replica_group\": G}`\n2. Mark `joining`\n3. Recompute assignments — `affected_shards` where `meili-N` enters the top-RF within group G\n4. **Dual-write**: new inbound writes for affected shards go to **both** old owner and new node (idempotent — Meilisearch PUT semantics handle dupes via primary key)\n5. For each affected shard, background migration via the shard-filter primitive (plan §4):\n ```\n GET /indexes/{uid}/documents?filter=_miroir_shard={shard_id}&limit=1000&offset=0\n GET /indexes/{uid}/documents?filter=_miroir_shard={shard_id}&limit=1000&offset=1000\n ... until exhausted\n ```\n6. Write each page to the new node (docs already carry `_miroir_shard`)\n7. Mark `active`; stop dual-write\n8. Delete migrated shard from old node: `POST /indexes/{uid}/documents/delete {\"filter\": \"_miroir_shard = {shard_id}\"}`\n9. Documents on unaffected shards never touched\n\n## Why\n\nPlan §1 principle 4 (RF-configurable redundancy) + §2 \"Three independent scaling dimensions\" depend on this. The `_miroir_shard` filter primitive is what makes migration move only `~total_docs/(N+1)` docs instead of `total_docs` — a 10–100× reduction in I/O vs. a naive \"copy everything then diff\" approach.\n\n## Details\n\n**Dual-write durability invariant**: between steps 4 and 7, every accepted write for the affected shards lands on both old and new. If dual-write is skipped while migration is running, writes arriving at that exact moment may land only on the old owner and be lost when step 8 deletes. Plan §15 Open Problem 1 is the remaining race; §13.8 anti-entropy (Phase 5) is the safety net.\n\n**Pagination cursor**: `offset` is the simplest, but Meilisearch `limit + offset` has an internal cap (default 1000 + 0 → max ~20 for safe). Configure `pagination.maxTotalHits` per-node at index creation to allow deep pagination (safe: we're just iterating our own injected shard).\n\n**Per-page batch**: `rebalancer.migration_batch_size` (default 1000) — one page read + one page write per cycle.\n\n**Fail-open behavior**: if the source node becomes unavailable mid-migration, the rebalancer pauses this shard; other shards continue. When source comes back, resume.\n\n## Acceptance\n\n- [ ] Integration test: 3-node → 4-node migration, 10K docs, each doc still retrievable by ID after migration\n- [ ] Chaos: toggle writes on/off during migration; dual-write window catches all late writes\n- [ ] Performance: migrating `~S/(Ng+1)` shards moves ≤ `total_docs / (Ng+1) × 1.1` docs (10% slack for dual-write dupes)\n- [ ] The old node is not queried for the migrated shards after step 8 (verified via log inspection)","design":"","acceptance_criteria":"","notes":"","status":"open","priority":0,"issue_type":"task","created_at":"2026-04-18T21:31:43.790167851Z","created_by":"coding","updated_at":"2026-04-18T21:31:48.930644191Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase-4"],"dependencies":[{"issue_id":"miroir-mkk.2","depends_on_id":"miroir-mkk.1","type":"blocks","created_at":"2026-04-18T21:31:48.930624028Z","created_by":"coding","metadata":"{}","thread_id":""}]} {"id":"miroir-mkk.3","title":"P4.3 Node removal (drain): migrate off + delete PVC handoff","description":"## What\n\nImplement `POST /_miroir/nodes/{id}/drain` + `DELETE /_miroir/nodes/{id}` (plan §2 \"Removing a node\"):\n1. Mark `draining`; stop routing writes for its affected shards to it\n2. Recompute assignments — affected shards reassigned to surviving nodes in the same group\n3. Background migration: copy affected shards to new owners via the `_miroir_shard` filter primitive\n4. Mark `removed`\n5. `DELETE /_miroir/nodes/{id}` actually removes from config; operator deletes pod + PVC out-of-band\n\n## Why\n\nPlan §2: \"movement: ~RF/Ng of that group's documents\" on removal. The drain API decouples \"stop taking writes\" (immediate) from \"delete the pod\" (operator decision) — gives operators room to verify before committing to hardware loss.\n\n## Details\n\n**Order matters**: drain → remove. `drain` is reversible (mark `active` again); `remove` is not. CLI (`miroir-ctl node drain meili-2` per plan §11) should pause and await confirmation before the remove step.\n\n**Still readable during drain**: reads that previously routed to the draining node still work — the node is not down, just not accepting new writes for the affected shards. Read traffic naturally drifts to the replacement replica via Phase 1 `covering_set` intra-group rotation.\n\n**Safety check**: refuse drain if it would drop a shard below RF=1 in its group AND the group has no healthy peer group to fall back to. Require `--force` to override.\n\n**Post-drain verification**: query `GET /indexes/{uid}/documents?filter=_miroir_shard={s}&limit=1` against the drained node — should return 0 results for every shard before `remove` is permitted.\n\n## Acceptance\n\n- [ ] 3-node RF=2 group: drain node-1; searches still succeed with zero degraded responses\n- [ ] After drain completes, `GET /indexes/{uid}/documents?filter=_miroir_shard={s}&limit=1` on node-1 returns 0 for every shard\n- [ ] `remove` without prior `drain` → 409 conflict with a message pointing at `drain` first\n- [ ] `--force` drain that would drop a shard to 0 replicas surfaces a loud warning before proceeding","design":"","acceptance_criteria":"","notes":"","status":"open","priority":0,"issue_type":"task","created_at":"2026-04-18T21:31:43.815997915Z","created_by":"coding","updated_at":"2026-04-18T21:31:48.943083697Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase-4"],"dependencies":[{"issue_id":"miroir-mkk.3","depends_on_id":"miroir-mkk.1","type":"blocks","created_at":"2026-04-18T21:31:48.943066166Z","created_by":"coding","metadata":"{}","thread_id":""}]} {"id":"miroir-mkk.4","title":"P4.4 Replica group addition: initializing → active","description":"## What\n\nImplement the \"Adding a new replica group\" flow from plan §2:\n1. Provision new nodes; assign `replica_group: G_new` in config\n2. Mark new group `initializing`; queries NOT routed here\n3. Background sync: for each shard, copy all docs from **any** healthy existing group to the new group's nodes via `filter=_miroir_shard={id}` pagination; new inbound writes already fan out to the new group immediately\n4. When all shards synced, mark group `active` — queries begin routing in round-robin\n5. Existing groups continue serving queries throughout (zero read interruption)\n\n## Why\n\nPlan §2 \"Adding a new replica group (throughput scaling)\": adding a group multiplies query capacity without touching existing groups' data. This is the primary \"we need more search QPS\" lever. Unlike intra-group rebalance which moves a subset, group-add **copies** every shard to the new group — so the I/O is proportional to total corpus size, not `1/(Ng+1)`.\n\n## Details\n\n**Source group selection**: round-robin across existing `active` groups to spread read load during sync. Per-shard picks a different source so one group isn't hammered.\n\n**Write fan-out during sync**: new group already receives writes from step 3 onward. This is the durability guarantee — only the backfill window of historical data is transient.\n\n**Progress tracking**: per-shard cursor in `jobs` table; can be paused/resumed per Phase 6 Mode C.\n\n**Verification before `active`**: `GET /indexes/{uid}/stats` against new group → docs count within 0.1% of source group (allows for writes landing during sync). If higher variance, delay the flip and investigate.\n\n## Acceptance\n\n- [ ] Integration test: RG=1 → RG=2; during sync, query throughput on original group unchanged (no regression)\n- [ ] After `active`, queries distribute round-robin between the two groups (verified via per-group metrics)\n- [ ] Mid-sync write test: 100 writes landing during the backfill window are all present on both groups when sync completes\n- [ ] Failed sync (source group becomes unavailable mid-copy) pauses without corrupting new group; resumes when source returns","design":"","acceptance_criteria":"","notes":"","status":"open","priority":0,"issue_type":"task","created_at":"2026-04-18T21:31:43.859158013Z","created_by":"coding","updated_at":"2026-04-18T21:31:48.961616587Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase-4"],"dependencies":[{"issue_id":"miroir-mkk.4","depends_on_id":"miroir-mkk.1","type":"blocks","created_at":"2026-04-18T21:31:48.961576914Z","created_by":"coding","metadata":"{}","thread_id":""}]} @@ -137,7 +137,7 @@ {"id":"miroir-uhj.5.4","title":"P5.5.d Drift reconciler: periodic hash comparison + auto-repair","description":"Plan §13.5 'Drift reconciler (always on).' Background task every settings_drift_check.interval_s (default 5 min). Hash each (index, node) settings; compare against cluster committed version. Catches out-of-band changes (direct operator PATCH to a single node). Auto-repair: reapply cluster settings to divergent node. Scaling mode: Mode A (plan §14.6) — each pod polls a subset of (index, node) pairs by rendezvous. Metric: miroir_settings_drift_repair_total counter ticks each auto-repair.","design":"","acceptance_criteria":"","notes":"","status":"open","priority":1,"issue_type":"task","created_at":"2026-04-18T21:50:54.222789382Z","created_by":"coding","updated_at":"2026-04-18T21:50:54.222789382Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["advanced-13","phase-5"]} {"id":"miroir-uhj.5.5","title":"P5.5.e Client-pinned freshness: X-Miroir-Min-Settings-Version header","description":"Plan §13.5 'Client-pinned freshness'. Clients echo last-observed X-Miroir-Settings-Version as X-Miroir-Min-Settings-Version on subsequent reads. Miroir consults node_settings_version(index, node_id) in task store: excludes nodes where version < floor. If no covering set assembles after exclusion: HTTP 503 miroir_settings_version_stale (client retries). Gives explicit opt-in freshness floor without session state (X-Miroir-Session is orthogonal — covers doc-data freshness).","design":"","acceptance_criteria":"","notes":"","status":"open","priority":1,"issue_type":"task","created_at":"2026-04-18T21:50:54.272659154Z","created_by":"coding","updated_at":"2026-04-18T21:52:42.870100260Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["advanced-13","phase-5"],"dependencies":[{"issue_id":"miroir-uhj.5.5","depends_on_id":"miroir-uhj.5.3","type":"blocks","created_at":"2026-04-18T21:52:42.870065730Z","created_by":"coding","metadata":"{}","thread_id":""}]} {"id":"miroir-uhj.6","title":"P5.6 §13.6 Read-your-writes via session pinning","description":"## What\n\nAdd `X-Miroir-Session: ` support for read-your-writes semantics (plan §13.6):\n\n**On write with session header**: record `{mtask_id, last_write_at, pinned_group}` in `sessions` table. `pinned_group` is the first group to reach per-group quorum; ties broken by ascending group_id.\n\n**On read with session header and pending write**: route exclusively to `pinned_group`. Two wait strategies:\n- `block` — block at orchestrator until the mapped node task reaches `succeeded` (poll `GET /tasks/{uid}` 25 ms start, exponential backoff, cap `max_wait_ms`). Only strategy strictly guaranteeing the prior write is visible.\n- `route_pin` — route to `pinned_group` without waiting. Caller accepts \"my own writes eventually, never cross-group stale.\"\n\n**On read without pending write**: session pin released; normal routing.\n\n**No session header**: exactly today's behavior.\n\n## Why\n\nPlan §13.6: \"SDKs work around this by polling task status — clumsy and error-prone.\" Session pinning solves it in one header with opt-in semantics.\n\n## Details\n\n**Session TTL** default 15 min; LRU bound `session_pinning.max_sessions` (default 100000 → ~50 MB plan §14.2).\n\n**Pinned-group failure**: if the pinned group later fails, pin is cleared; subsequent reads use normal routing (recent write still observable from any group that ACKd).\n\n**Scaling mode**: shared-state per-pod cache — sessions in Redis (HA); per-pod LRU caches for hot sessions.\n\n**Config** (plan §13.6):\n```yaml\nsession_pinning:\n enabled: true\n ttl_seconds: 900\n max_sessions: 100000\n wait_strategy: block\n max_wait_ms: 5000\n```\n\n**Metrics**: `miroir_session_active_count`, `miroir_session_pin_enforced_total`, `miroir_session_wait_duration_seconds`, `miroir_session_wait_timeout_total`.\n\n**Interaction with §13.11 multi-search**: per-sub-query evaluation (plan §13.11 \"Interaction\" paragraph).\n**Interaction with §13.15 tenant affinity**: session pin wins on conflict (strong consistency beats tenant isolation); logs `miroir_tenant_session_pin_override_total{tenant}`.\n\n## Acceptance\n\n- [ ] Write + session + immediate read with `block` → read sees the write (100/100 trials)\n- [ ] Write + session + immediate read with `route_pin` → read routed to pinned group; may return stale results (documented behavior)\n- [ ] Pinned group fails mid-session → pin cleared; read succeeds via another group (may not see recent write — expected per plan §13.6 \"Failure handling\")\n- [ ] Session TTL expiry: LRU evicts oldest when cap hit","design":"","acceptance_criteria":"","notes":"","status":"closed","priority":0,"issue_type":"task","assignee":"claude-code-glm-4.7-delta","created_at":"2026-04-18T21:33:36.867183010Z","created_by":"coding","updated_at":"2026-05-23T05:00:52.933143279Z","closed_at":"2026-05-23T05:00:52.933143279Z","close_reason":"P5.6 §13.6 Session pinning implementation complete.\n\nAll acceptance criteria verified:\n- ✅ Write + session + immediate read with block → read sees the write (100/100 trials)\n- ✅ Write + session + immediate read with route_pin → read routed to pinned group\n- ✅ Pinned group fails mid-session → pin cleared; read succeeds via another group\n- ✅ Session TTL expiry: LRU evicts oldest when cap hit\n\n## Retrospective\n- **What worked:** The session pinning implementation was already complete from previous work. The SessionManager, middleware integration, and request handlers were all properly wired. All 20 integration tests pass.\n- **What didn't:** N/A - implementation was already done.\n- **Surprise:** The session pinning code was more comprehensive than expected, including both block and route_pin strategies, proper TTL handling, LRU eviction, and metrics integration.\n- **Reusable pattern:** The session manager pattern (in-memory LRU cache with async RwLock) works well for other per-request state tracking needs.","source_repo":".","compaction_level":0,"original_size":0,"labels":["advanced-13","phase-5"],"dependencies":[{"issue_id":"miroir-uhj.6","depends_on_id":"miroir-uhj.5","type":"blocks","created_at":"2026-04-18T21:38:33.166505657Z","created_by":"coding","metadata":"{}","thread_id":""}]} -{"id":"miroir-uhj.7","title":"P5.7 §13.7 Atomic index aliases (single + multi-target)","description":"## What\n\nIntroduce an alias layer in the orchestrator (plan §13.7). Two alias kinds, stored in the `aliases` table (Phase 3):\n- **Single-target**: `current_uid` → one concrete index; writes + reads resolve to that UID; atomic flip via `PUT /_miroir/aliases/{name}`\n- **Multi-target**: `target_uids` → list of UIDs; reads fan out via §13.11 multi-search + merge by `_rankingScore`; writes rejected with `miroir_multi_alias_not_writable`. Managed exclusively by §13.17 ILM.\n\nAdmin API (plan §4 admin table):\n- `POST /_miroir/aliases` (body creates single OR multi depending on `target` vs. `targets` field)\n- `GET /_miroir/aliases` (list)\n- `GET /_miroir/aliases/{name}` (current + flip history)\n- `PUT /_miroir/aliases/{name}` (atomic flip; kind must match existing alias)\n- `DELETE /_miroir/aliases/{name}` (alias only; underlying index untouched)\n\n## Why\n\nPlan §13.7: \"Reindexing today requires either downtime (delete + recreate) or application-layer dual-writes. Schema migrations, synonym overhauls, and dataset refreshes are high-risk.\" Aliases make those operational.\n\n§13.1 reshard step 5 is an alias flip; §13.17 ILM read_alias is a multi-target alias.\n\n## Details\n\n**Resolution**: happens at the proxy's routing step before any fan-out; an already-routed request completes against the UID(s) captured at route time, so flips never tear in-flight requests.\n\n**History**: `aliases.history` is a JSON array bounded by `aliases.history_retention` (default 10). Last-N flips retained for debugging + rollback.\n\n**Scaling mode**: shared state (task store); all pods read same table with short TTL cache.\n\n**Config**:\n```yaml\naliases:\n enabled: true\n history_retention: 10\n require_target_exists: true\n```\n\n**Metrics**: `miroir_alias_resolutions_total{alias}`, `miroir_alias_flips_total{alias}`.\n\n**Write-attempt on multi-target alias**: 409 `miroir_multi_alias_not_writable` with message pointing at owning ILM policy.\n\n## Acceptance\n\n- [ ] Create single-target alias → both writes + reads resolve\n- [ ] Flip: new writes land on new target; in-flight (pre-flip) request completes against the old target without error\n- [ ] Create multi-target alias → read fans out; write returns 409\n- [ ] Operator edit of an ILM-managed multi-target alias → 409 (only ILM can modify)\n- [ ] History: 11th flip evicts the oldest","design":"","acceptance_criteria":"","notes":"","status":"in_progress","priority":0,"issue_type":"task","assignee":"claude-code-glm-4.7-delta","created_at":"2026-04-18T21:35:21.739087923Z","created_by":"coding","updated_at":"2026-05-23T06:09:29.395304776Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["advanced-13","phase-5"]} +{"id":"miroir-uhj.7","title":"P5.7 §13.7 Atomic index aliases (single + multi-target)","description":"## What\n\nIntroduce an alias layer in the orchestrator (plan §13.7). Two alias kinds, stored in the `aliases` table (Phase 3):\n- **Single-target**: `current_uid` → one concrete index; writes + reads resolve to that UID; atomic flip via `PUT /_miroir/aliases/{name}`\n- **Multi-target**: `target_uids` → list of UIDs; reads fan out via §13.11 multi-search + merge by `_rankingScore`; writes rejected with `miroir_multi_alias_not_writable`. Managed exclusively by §13.17 ILM.\n\nAdmin API (plan §4 admin table):\n- `POST /_miroir/aliases` (body creates single OR multi depending on `target` vs. `targets` field)\n- `GET /_miroir/aliases` (list)\n- `GET /_miroir/aliases/{name}` (current + flip history)\n- `PUT /_miroir/aliases/{name}` (atomic flip; kind must match existing alias)\n- `DELETE /_miroir/aliases/{name}` (alias only; underlying index untouched)\n\n## Why\n\nPlan §13.7: \"Reindexing today requires either downtime (delete + recreate) or application-layer dual-writes. Schema migrations, synonym overhauls, and dataset refreshes are high-risk.\" Aliases make those operational.\n\n§13.1 reshard step 5 is an alias flip; §13.17 ILM read_alias is a multi-target alias.\n\n## Details\n\n**Resolution**: happens at the proxy's routing step before any fan-out; an already-routed request completes against the UID(s) captured at route time, so flips never tear in-flight requests.\n\n**History**: `aliases.history` is a JSON array bounded by `aliases.history_retention` (default 10). Last-N flips retained for debugging + rollback.\n\n**Scaling mode**: shared state (task store); all pods read same table with short TTL cache.\n\n**Config**:\n```yaml\naliases:\n enabled: true\n history_retention: 10\n require_target_exists: true\n```\n\n**Metrics**: `miroir_alias_resolutions_total{alias}`, `miroir_alias_flips_total{alias}`.\n\n**Write-attempt on multi-target alias**: 409 `miroir_multi_alias_not_writable` with message pointing at owning ILM policy.\n\n## Acceptance\n\n- [ ] Create single-target alias → both writes + reads resolve\n- [ ] Flip: new writes land on new target; in-flight (pre-flip) request completes against the old target without error\n- [ ] Create multi-target alias → read fans out; write returns 409\n- [ ] Operator edit of an ILM-managed multi-target alias → 409 (only ILM can modify)\n- [ ] History: 11th flip evicts the oldest","design":"","acceptance_criteria":"","notes":"","status":"closed","priority":0,"issue_type":"task","assignee":"claude-code-glm-4.7-echo","created_at":"2026-04-18T21:35:21.739087923Z","created_by":"coding","updated_at":"2026-05-23T06:14:13.927122929Z","closed_at":"2026-05-23T06:14:13.927122929Z","close_reason":"P5.7 §13.7: Atomic index aliases - VERIFIED COMPLETE\n\nAll acceptance criteria verified as already implemented in prior commits:\n- Single-target alias resolution for reads and writes\n- Atomic alias flipping with no in-flight request tearing\n- Multi-target aliases for read-only ILM use\n- Write rejection (409) for multi-target aliases\n- History retention with eviction (default: 10)\n\n17/17 acceptance tests pass. 28/28 lib tests pass.\n\nRetrospective:\n- What worked: AliasRegistry pattern (in-memory + task-store persistence) provides fast resolution with consistency\n- What didn't: N/A (verification task)\n- Surprise: Multi-target aliases are explicitly read-only, with 409 error pointing to owning ILM policy\n- Reusable pattern: In-memory registry with task-store persistence, sync on startup, dual-level interfaces (registry + admin API)\n\nImplementation completed in commits:\n- c670d09: Fix alias admin API routes and reorganize alias module\n- 821dea3: Complete alias acceptance tests\n- 823fdd0: Add atomic index alias integration tests\n- f564f3d: Add alias flip metrics emission","source_repo":".","compaction_level":0,"original_size":0,"labels":["advanced-13","phase-5"]} {"id":"miroir-uhj.8","title":"P5.8 §13.8 Anti-entropy shard reconciler (OP#1 closure)","description":"## What\n\nBackground reconciler runs per-shard on a schedule (plan §13.8), in three steps:\n\n**Step 1 — Fingerprint**: iterate docs with `filter=_miroir_shard={id}` paginated; hash(`primary_key || canonical_content_hash`); fold into streaming xxh3 digest keyed by PK. All replicas should produce the same root.\n\n**Step 2 — Diff on mismatch**: recompute per-bucket (pk-hash % 256) digests, locate divergent buckets, enumerate divergent PKs.\n\n**Step 3 — Repair**:\n```\nfor each divergent pk:\n read doc from each replica\n if any replica has _miroir_expires_at <= now:\n // TTL-suspend: never resurrect — DELETE from every replica\n tag with _miroir_origin: antientropy (suppressed in CDC)\n else:\n pick authoritative: highest _miroir_updated_at, newest node task_uid tiebreak\n PUT to all replicas that disagree\n tag with _miroir_origin: antientropy\n```\n\n## Why\n\nPlan §15 Open Problem 1 closure: \"Any document the migration cutover misses is caught on the next pass.\" Plus a standalone value: replicas drift silently (dropped write, partitioned delete, bug) — anti-entropy catches them.\n\n## Details\n\n**`_miroir_updated_at` reserved field**: integer ms since epoch, stamped by orchestrator on every write when `anti_entropy.enabled: true`. Plan §5 reserved fields table confirms: reserved only when AE is on; otherwise pass-through.\n\n**TTL interaction** (§13.14): TTL sweeps must fan out to all replicas in one quorum write; AE treats any replica's `_miroir_expires_at <= now` as \"delete from all\" — the \"highest updated_at wins\" rule is **suspended** for expired docs (plan §13.14 interaction paragraph).\n\n**Scaling mode** (plan §14.6): Mode A — each pod fingerprints and repairs its rendezvous-owned shards.\n\n**Self-throttling**: sleeps between shards; targets < 2% per-node CPU by default.\n\n**Config**:\n```yaml\nanti_entropy:\n enabled: true\n schedule: \"every 6h\"\n shards_per_pass: 0\n max_read_concurrency: 2\n fingerprint_batch_size: 1000\n auto_repair: true\n updated_at_field: _miroir_updated_at\n```\n\n**Metrics**: `miroir_antientropy_shards_scanned_total`, `miroir_antientropy_mismatches_found_total`, `miroir_antientropy_docs_repaired_total`, `miroir_antientropy_last_scan_completed_seconds`.\n\n**Alert**: `MiroirAntientropyMismatch` fires when mismatches persist for 3 consecutive passes (~18h at default schedule).\n\n## Acceptance\n\n- [ ] Induce divergence on 1 shard; reconciler detects within `schedule` interval and repairs\n- [ ] Expired-doc test: a stale write with older `updated_at` does NOT resurrect a doc whose `_miroir_expires_at <= now`\n- [ ] CDC subscribers do NOT see anti-entropy writes (filtered by `_miroir_origin`)\n- [ ] Mode A: 3 pods, each owns ~1/3 of shards; anti-entropy runs exactly once per shard per interval cluster-wide","design":"","acceptance_criteria":"","notes":"","status":"open","priority":0,"issue_type":"task","created_at":"2026-04-18T21:35:21.765464465Z","created_by":"coding","updated_at":"2026-04-18T21:38:33.181224998Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["advanced-13","phase-5"],"dependencies":[{"issue_id":"miroir-uhj.8","depends_on_id":"miroir-uhj.14","type":"blocks","created_at":"2026-04-18T21:38:33.181204787Z","created_by":"coding","metadata":"{}","thread_id":""}]} {"id":"miroir-uhj.8.1","title":"P5.8.a Fingerprint step: per-replica xxh3 digest over (pk || content_hash)","description":"Anti-entropy step 1 (plan §13.8). For each replica of the shard: iterate docs via filter=_miroir_shard={id} paginated; for each doc: hash(primary_key || canonical_content_hash); fold into a Merkle root OR streaming xxh3 digest keyed by pk. All replicas SHOULD produce the same root in steady state. Costs dominated by read bandwidth (self-throttled to <2% CPU target). Throttle knobs: schedule (default 'every 6h'), shards_per_pass (0=all), max_read_concurrency (2), fingerprint_batch_size (1000).","design":"","acceptance_criteria":"","notes":"","status":"open","priority":0,"issue_type":"task","created_at":"2026-04-18T21:51:10.718105882Z","created_by":"coding","updated_at":"2026-04-18T21:51:10.718105882Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["advanced-13","phase-5"]} {"id":"miroir-uhj.8.2","title":"P5.8.b Diff step: bucket-granular re-digest to find divergent PKs","description":"Anti-entropy step 2 (plan §13.8). Triggered on fingerprint root mismatch. Recompute per-bucket digests (pk-hash % 256). Bucketed comparison isolates divergence to ~0.4% of the PK space per bucket. Then enumerate divergent PKs within the bucket. Reused by §13.1 reshard verify with PK-keyed (not shard-keyed) bucketing so cross-S comparison works.","design":"","acceptance_criteria":"","notes":"","status":"open","priority":0,"issue_type":"task","created_at":"2026-04-18T21:51:10.752927624Z","created_by":"coding","updated_at":"2026-04-18T21:52:42.911112407Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["advanced-13","phase-5"],"dependencies":[{"issue_id":"miroir-uhj.8.2","depends_on_id":"miroir-uhj.8.1","type":"blocks","created_at":"2026-04-18T21:52:42.911034687Z","created_by":"coding","metadata":"{}","thread_id":""}]} diff --git a/.beads/traces/miroir-afh.1/metadata.json b/.beads/traces/miroir-afh.1/metadata.json new file mode 100644 index 0000000..d100dcc --- /dev/null +++ b/.beads/traces/miroir-afh.1/metadata.json @@ -0,0 +1,16 @@ +{ + "bead_id": "miroir-afh.1", + "agent": "claude-code-glm-4.7", + "provider": "zai", + "model": "glm-4.7", + "exit_code": 1, + "outcome": "failure", + "duration_ms": 407520, + 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+{"type":"assistant","message":{"id":"msg_20260523142255d3ef97fe7e314354","type":"message","role":"assistant","model":"glm-4.7","content":[{"type":"tool_use","id":"call_523a595f068b43b59ec6b6e4","name":"Read","input":{"file_path":"/home/coding/miroir/crates/miroir-proxy/src/middleware.rs"}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":"call_fbc4ae069de4433aa2e41c0c","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"cac06d04-9615-4ceb-9f68-84c451b507e5"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_ff427d007993429d972d53da","type":"tool_result","content":"1\t[package]\n2\tname = \"miroir-core\"\n3\tversion.workspace = true\n4\tedition.workspace = true\n5\tlicense.workspace = true\n6\trepository.workspace = true\n7\tautobenches = false\n8\t\n9\t[dependencies]\n10\tserde = { workspace = true }\n11\tserde_json = { workspace = true }\n12\tserde_yaml = \"0.9\"\n13\ttwox-hash = \"2\"\n14\tthiserror = { workspace = true }\n15\ttracing = { workspace = true }\n16\tuuid = { version = \"1\", features = [\"v4\", \"serde\"] }\n17\tconfig = \"0.14\"\n18\trusqlite = { workspace = true }\n19\tfutures-util = \"0.3\"\n20\t# Redis support (optional — enable via `redis-store` feature)\n21\tredis = { version = \"0.27\", features = [\"aio\", \"tokio-comp\", \"connection-manager\"], optional = true }\n22\thex = \"0.4\"\n23\ttokio = { version = \"1\", features = [\"rt\", \"rt-multi-thread\", \"time\", \"sync\", \"macros\"] }\n24\tasync-trait = \"0.1\"\n25\trand = \"0.8\"\n26\treqwest = { version = \"0.12\", features = [\"json\"], default-features = false }\n27\turlencoding = \"2\"\n28\tsha2 = \"0.10\"\n29\tindexmap = \"2\"\n30\tchrono = { version = \"0.4\", features = [\"serde\"] }\n31\tregex = \"1\"\n32\ttrust-dns-resolver = { version = \"0.12\", optional = true }\n33\t# Axum integration (optional — enable via `axum` feature)\n34\taxum = { version = \"0.7\", optional = true }\n35\t\n36\t# Raft prototype (P12.OP2 research) — not for production use\n37\t# openraft 0.9.22 fails on stable Rust 1.87 (validit uses let_chains).\n38\t# The prototype simulates Raft; only bincode is needed for serialization benchmarks.\n39\tbincode = { version = \"2\", features = [\"serde\"], optional = true }\n40\t\n41\t[features]\n42\tdefault = []\n43\traft-proto = [\"bincode\"]\n44\tredis-store = [\"redis\"]\n45\taxum = [\"dep:axum\"]\n46\tpeer-discovery = [\"trust-dns-resolver\"]\n47\t# Enable when openraft compiles on stable Rust:\n48\t# raft-full = [\"openraft\", \"bincode\"]\n49\t# (openraft dep removed from manifest — restore when upstream fixes let_chains on stable)\n50\t\n51\t[[bin]]\n52\tname = \"bench-reshard-load\"\n53\tpath = \"benches/reshard_load.rs\"\n54\t\n55\t[[bench]]\n56\tname = \"merger_bench\"\n57\tharness = false\n58\t\n59\t[[bench]]\n60\tname = \"router_bench\"\n61\tharness = false\n62\t\n63\t[[bench]]\n64\tname = \"dfs_preflight_bench\"\n65\tharness = false\n66\t\n67\t[dev-dependencies]\n68\ttempfile = \"3\"\n69\tproptest = \"1\"\n70\tcriterion = \"0.5\"\n71\ttokio = { version = \"1\", features = [\"rt\", \"macros\", \"time\"] }\n72\ttestcontainers = \"0.23\"\n73\ttestcontainers-modules = { version = \"0.11\", features = [\"redis\"] }\n74\t"}]},"parent_tool_use_id":"call_fbc4ae069de4433aa2e41c0c","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"f2769034-60b0-43d3-a4f3-2f7e3384ea65","timestamp":"2026-05-23T06:22:57.038Z"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_2fa05e37da8f4dca809d2a85","type":"tool_result","content":"1\t[package]\n2\tname = \"miroir-proxy\"\n3\tversion.workspace = true\n4\tedition.workspace = true\n5\tlicense.workspace = true\n6\trepository.workspace = true\n7\t\n8\t[features]\n9\tdefault = []\n10\ttracing = [\"opentelemetry\", \"opentelemetry-otlp\", \"opentelemetry_sdk\", \"tracing-opentelemetry\"]\n11\t\n12\t[[bin]]\n13\tname = \"miroir-proxy\"\n14\tpath = \"src/main.rs\"\n15\t\n16\t[dependencies]\n17\tanyhow = \"1\"\n18\tasync-trait = \"0.1\"\n19\taxum = \"0.7\"\n20\thttp = \"1.1\"\n21\ttokio = { version = \"1\", features = [\"rt-multi-thread\", \"signal\"] }\n22\treqwest = { version = \"0.12\", features = [\"json\", \"rustls-tls\"], default-features = false }\n23\tserde = { version = \"1.0\", features = [\"derive\"] }\n24\tserde_json = \"1.0\"\n25\tconfig = \"0.14\"\n26\ttracing = \"0.1\"\n27\ttracing-subscriber = { version = \"0.3\", features = [\"env-filter\", \"json\"] }\n28\tprometheus = \"0.13\"\n29\tuuid = { version = \"1.11\", features = [\"v7\"] }\n30\tsubtle = \"2\"\n31\thmac = \"0.12\"\n32\tsha2 = \"0.10\"\n33\tbase64 = \"0.22\"\n34\tchacha20poly1305 = \"0.10\"\n35\trand = \"0.8\"\n36\tdashmap = \"6\"\n37\thex = \"0.4\"\n38\ttower = \"0.5\"\n39\tmiroir-core = { path = \"../miroir-core\", features = [\"axum\", \"redis-store\", \"peer-discovery\"] }\n40\trust-embed = \"8\"\n41\tmime_guess = \"2\"\n42\tchrono = \"0.4\"\n43\t\n44\t# OpenTelemetry (optional - use feature flag to enable)\n45\topentelemetry = { version = \"0.27\", optional = true }\n46\topentelemetry-otlp = { version = \"0.27\", features = [\"grpc-tonic\"], optional = true }\n47\topentelemetry_sdk = { version = \"0.27\", features = [\"rt-tokio\"], optional = true }\n48\ttracing-opentelemetry = { version = \"0.28\", optional = true }\n49\t\n50\t[dev-dependencies]\n51\ttower = \"0.5\"\n52\thttp-body-util = \"0.1\"\n53\tmockito = \"1\"\n54\ttokio = { version = \"1\", features = [\"rt\", \"macros\", \"rt-multi-thread\"] }\n55\ttestcontainers = \"0.23\"\n56\ttestcontainers-modules = { version = \"0.11\", features = [\"redis\"] }\n57\ttempfile = \"3\"\n58\t"}]},"parent_tool_use_id":"call_fbc4ae069de4433aa2e41c0c","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"dd8628f2-a11b-42fd-98a2-8d1016abe283","timestamp":"2026-05-23T06:22:57.042Z"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_955cac15dd314fdca0c237e9","type":"tool_result","content":"1\tuse axum::{\n2\t extract::FromRef,\n3\t routing::{get, post},\n4\t Router,\n5\t};\n6\tuse miroir_core::{\n7\t config::MiroirConfig,\n8\t peer_discovery::PeerDiscovery,\n9\t rebalancer_worker::{RebalancerWorker, RebalancerWorkerConfig, TopologyChangeEvent},\n10\t task_pruner,\n11\t topology::{NodeStatus, Topology},\n12\t};\n13\tuse std::net::SocketAddr;\n14\tuse std::time::Duration;\n15\tuse tokio::signal;\n16\tuse tracing::{error, info};\n17\tuse tracing_subscriber::{EnvFilter, layer::SubscriberExt, registry, util::SubscriberInitExt};\n18\t\n19\tmod admin_session;\n20\tmod auth;\n21\tmod client;\n22\tmod middleware;\n23\tmod otel;\n24\tmod routes;\n25\tmod scoped_key_rotation;\n26\t\n27\tuse admin_session::SealKey;\n28\tuse auth::AuthState;\n29\tuse miroir_core::{\n30\t canary::{CanaryAssertion, CanaryRunner, CapturedQuery, QueryCapture, SearchQuery, SearchResponse},\n31\t task_store::TaskStore,\n32\t};\n33\tuse middleware::{Metrics, metrics_router, TelemetryState};\n34\tuse routes::{\n35\t admin, admin_endpoints, explain, health, indexes, keys, multi_search, search, settings, tasks, version,\n36\t};\n37\tuse scoped_key_rotation::ScopedKeyRotationState;\n38\tuse std::sync::Arc;\n39\t\n40\t/// Unified application state containing all shared state.\n41\t#[derive(Clone)]\n42\tstruct UnifiedState {\n43\t auth: AuthState,\n44\t metrics: Metrics,\n45\t admin: admin_endpoints::AppState,\n46\t pod_id: String,\n47\t redis_store: Option,\n48\t query_capture: Arc,\n49\t peer_discovery: Option>,\n50\t}\n51\t\n52\timpl UnifiedState {\n53\t fn new(config: MiroirConfig) -> Self {\n54\t let metrics = Metrics::new(&config);\n55\t\n56\t let master_key = std::env::var(\"MIROIR_MASTER_KEY\")\n57\t .unwrap_or_else(|_| config.master_key.clone());\n58\t\n59\t let admin_key = std::env::var(\"MIROIR_ADMIN_API_KEY\")\n60\t .unwrap_or_else(|_| config.admin.api_key.clone());\n61\t\n62\t let jwt_primary = if config.search_ui.enabled {\n63\t std::env::var(&config.search_ui.auth.jwt_secret_env).ok()\n64\t } else {\n65\t None\n66\t };\n67\t\n68\t let jwt_previous = std::env::var(&config.search_ui.auth.jwt_secret_previous_env)\n69\t .ok()\n70\t .filter(|v| !v.is_empty());\n71\t\n72\t let seal_key = SealKey::from_env_or_generate();\n73\t\n74\t // Set the key-generated gauge before constructing AuthState\n75\t // so the metric is accurate from the first scrape.\n76\t metrics.admin_session_key_generated().set(if seal_key.is_generated() { 1.0 } else { 0.0 });\n77\t\n78\t let pod_id = std::env::var(\"POD_NAME\").unwrap_or_else(|_| \"unknown\".to_string());\n79\t let namespace = std::env::var(\"POD_NAMESPACE\").unwrap_or_else(|_| \"default\".to_string());\n80\t\n81\t // Create peer discovery instance (plan §14.5)\n82\t // Only enabled when running in Kubernetes (POD_NAME is set to a real pod name)\n83\t let peer_discovery = if pod_id != \"unknown\" {\n84\t Some(Arc::new(PeerDiscovery::new(\n85\t pod_id.clone(),\n86\t namespace,\n87\t config.peer_discovery.service_name.clone(),\n88\t )))\n89\t } else {\n90\t None\n91\t };\n92\t\n93\t // Create Redis task store if backend is redis (must happen before AppState\n94\t // so redis_store and pod_id are available to admin endpoints).\n95\t let redis_store = if config.task_store.backend == \"redis\" && !config.task_store.url.is_empty() {\n96\t let url = config.task_store.url.clone();\n97\t Some(\n98\t tokio::task::block_in_place(|| {\n99\t tokio::runtime::Handle::current().block_on(\n100\t miroir_core::task_store::RedisTaskStore::open(&url)\n101\t )\n102\t })\n103\t .expect(\"Failed to connect to Redis for scoped key rotation\"),\n104\t )\n105\t } else {\n106\t None\n107\t };\n108\t\n109\t let auth = AuthState {\n110\t master_key,\n111\t admin_key: admin_key.clone(),\n112\t jwt_primary,\n113\t jwt_previous,\n114\t seal_key: seal_key.clone(),\n115\t revoked_sessions: std::sync::Arc::new(dashmap::DashMap::new()),\n116\t admin_session_revoked_total: metrics.admin_session_revoked_total(),\n117\t };\n118\t\n119\t let admin = admin_endpoints::AppState::with_redis(\n120\t config.clone(),\n121\t metrics.clone(),\n122\t redis_store.clone(),\n123\t pod_id.clone(),\n124\t seal_key.clone(),\n125\t );\n126\t\n127\t Self {\n128\t auth,\n129\t metrics,\n130\t admin,\n131\t pod_id,\n132\t redis_store,\n133\t query_capture: Arc::new(QueryCapture::new(1000)),\n134\t peer_discovery,\n135\t }\n136\t }\n137\t}\n138\t\n139\t// Implement FromRef so that admin_endpoints::AppState can be extracted from UnifiedState\n140\timpl FromRef for admin_endpoints::AppState {\n141\t fn from_ref(state: &UnifiedState) -> Self {\n142\t Self {\n143\t config: state.admin.config.clone(),\n144\t topology: state.admin.topology.clone(),\n145\t ready: state.admin.ready.clone(),\n146\t metrics: state.admin.metrics.clone(),\n147\t version_state: state.admin.version_state.clone(),\n148\t task_registry: state.admin.task_registry.clone(),\n149\t redis_store: state.redis_store.clone(),\n150\t task_store: state.admin.task_store.clone(),\n151\t pod_id: state.pod_id.clone(),\n152\t seal_key: state.auth.seal_key.clone(),\n153\t local_rate_limiter: admin_endpoints::LocalAdminRateLimiter::new(),\n154\t local_search_ui_rate_limiter: admin_endpoints::LocalSearchUiRateLimiter::new(),\n155\t rebalancer: state.admin.rebalancer.clone(),\n156\t migration_coordinator: state.admin.migration_coordinator.clone(),\n157\t rebalancer_worker: state.admin.rebalancer_worker.clone(),\n158\t rebalancer_metrics: state.admin.rebalancer_metrics.clone(),\n159\t previous_docs_migrated: state.admin.previous_docs_migrated.clone(),\n160\t settings_broadcast: state.admin.settings_broadcast.clone(),\n161\t drift_reconciler: state.admin.drift_reconciler.clone(),\n162\t session_manager: state.admin.session_manager.clone(),\n163\t alias_registry: state.admin.alias_registry.clone(),\n164\t }\n165\t }\n166\t}\n167\t\n168\t// Implement FromRef so that TelemetryState can be extracted from UnifiedState\n169\timpl FromRef for TelemetryState {\n170\t fn from_ref(state: &UnifiedState) -> Self {\n171\t TelemetryState {\n172\t metrics: state.metrics.clone(),\n173\t pod_id: state.pod_id.clone(),\n174\t }\n175\t }\n176\t}\n177\t\n178\t// Implement FromRef so that CsrfState can be extracted from UnifiedState\n179\timpl FromRef for auth::CsrfState {\n180\t fn from_ref(state: &UnifiedState) -> Self {\n181\t auth::CsrfState {\n182\t auth: state.auth.clone(),\n183\t redis_store: state.redis_store.clone(),\n184\t }\n185\t }\n186\t}\n187\t\n188\t// Implement FromRef so that routes::aliases::AliasState can be extracted from UnifiedState\n189\timpl FromRef for routes::aliases::AliasState {\n190\t fn from_ref(state: &UnifiedState) -> Self {\n191\t Self {\n192\t config: state.admin.config.clone(),\n193\t task_store: state.admin.task_store.clone(),\n194\t metrics: state.metrics.clone(),\n195\t }\n196\t }\n197\t}\n198\t\n199\t// Implement FromRef so that routes::explain::ExplainState can be extracted from UnifiedState\n200\timpl FromRef for routes::explain::ExplainState {\n201\t fn from_ref(state: &UnifiedState) -> Self {\n202\t Self {\n203\t config: state.admin.config.clone(),\n204\t topology: state.admin.topology.clone(),\n205\t }\n206\t }\n207\t}\n208\t\n209\t// Implement FromRef so that routes::multi_search::MultiSearchState can be extracted from UnifiedState\n210\timpl FromRef for routes::multi_search::MultiSearchState {\n211\t fn from_ref(state: &UnifiedState) -> Self {\n212\t Self {\n213\t config: state.admin.config.clone(),\n214\t topology: state.admin.topology.clone(),\n215\t node_master_key: state.admin.config.master_key.clone(),\n216\t metrics: state.metrics.clone(),\n217\t alias_registry: state.admin.alias_registry.clone(),\n218\t }\n219\t }\n220\t}\n221\t\n222\t// Implement FromRef so that routes::canary::CanaryState can be extracted from UnifiedState\n223\timpl FromRef for routes::canary::CanaryState {\n224\t fn from_ref(state: &UnifiedState) -> Self {\n225\t // Canary routes require Redis task store\n226\t let redis_store = state.redis_store.clone()\n227\t .expect(\"Canary routes require Redis task store (task_store.backend: redis)\");\n228\t let store: Arc = Arc::from(redis_store);\n229\t Self {\n230\t store,\n231\t capture: state.query_capture.clone(),\n232\t }\n233\t }\n234\t}\n235\t\n236\t#[tokio::main]\n237\tasync fn main() -> anyhow::Result<()> {\n238\t // Load configuration (file → env → CLI overlay)\n239\t let config = MiroirConfig::load()\n240\t .map_err(|e| anyhow::anyhow!(\"Failed to load config: {}\", e))?;\n241\t\n242\t // Initialize structured JSON logging (plan §10 format)\n243\t // Fields on every line: timestamp, level, target, message, pod_id\n244\t // Per-request fields (request_id) are added by telemetry middleware span.\n245\t let filter = EnvFilter::try_from_default_env()\n246\t .unwrap_or_else(|_| EnvFilter::new(\"info\"));\n247\t\n248\t let pod_id = std::env::var(\"POD_NAME\").unwrap_or_else(|_| \"unknown\".to_string());\n249\t\n250\t // Build subscriber - conditionally add OTel layer\n251\t // Note: We rebuild the layers in each branch because the types differ\n252\t // OTel layer must be applied to the bare registry first\n253\t if let Some(otel_layer) = otel::init_otel_layer(&config) {\n254\t let json_layer = tracing_subscriber::fmt::layer()\n255\t .json()\n256\t .flatten_event(true)\n257\t .with_target(true)\n258\t .with_current_span(true)\n259\t .with_span_list(false);\n260\t // Apply OTel layer to registry first, then add filter and json layer\n261\t registry()\n262\t .with(otel_layer)\n263\t .with(filter)\n264\t .with(json_layer)\n265\t .init();\n266\t } else {\n267\t let json_layer = tracing_subscriber::fmt::layer()\n268\t .json()\n269\t .flatten_event(true)\n270\t .with_target(true)\n271\t .with_current_span(true)\n272\t .with_span_list(false);\n273\t registry()\n274\t .with(filter)\n275\t .with(json_layer)\n276\t .init();\n277\t }\n278\t\n279\t // Set pod_id as a global default field so it appears on every log line.\n280\t // This is done via a separate info span that is entered once and never\n281\t // left — its fields propagate to all child spans and events.\n282\t let _pod_span = tracing::info_span!(\"runtime\", pod_id = %pod_id).entered();\n283\t\n284\t info!(\n285\t shards = config.shards,\n286\t replication_factor = config.replication_factor,\n287\t replica_groups = config.replica_groups,\n288\t \"miroir-proxy starting\"\n289\t );\n290\t\n291\t // Validate critical secrets at startup (plan §9: \"orchestrator refuses to\n292\t // start the search UI without it\").\n293\t if config.search_ui.enabled {\n294\t let jwt_env = &config.search_ui.auth.jwt_secret_env;\n295\t match std::env::var(jwt_env) {\n296\t Ok(v) if !v.is_empty() => {}\n297\t _ => {\n298\t anyhow::bail!(\n299\t \"search_ui is enabled but {} is not set — refusing to start. \\\n300\t Either set the env var or disable search_ui (search_ui.enabled: false)\",\n301\t jwt_env\n302\t );\n303\t }\n304\t }\n305\t }\n306\t\n307\t // Build unified state\n308\t let state = UnifiedState::new(config.clone());\n309\t\n310\t // Start health checker background task\n311\t let health_checker_state = state.admin.clone();\n312\t tokio::spawn(async move {\n313\t run_health_checker(health_checker_state).await;\n314\t });\n315\t\n316\t // Start rebalancer worker background task (plan §4)\n317\t if let Some(ref worker) = state.admin.rebalancer_worker {\n318\t let worker = worker.clone();\n319\t let pod_id = state.pod_id.clone();\n320\t tokio::spawn(async move {\n321\t info!(\n322\t pod_id = %pod_id,\n323\t \"rebalancer worker task starting\"\n324\t );\n325\t // Load any persisted rebalance jobs from previous runs\n326\t if let Err(e) = worker.load_persisted_jobs().await {\n327\t error!(error = %e, \"failed to load persisted rebalance jobs\");\n328\t }\n329\t worker.run().await;\n330\t error!(\"rebalancer worker task exited unexpectedly\");\n331\t });\n332\t } else {\n333\t info!(\"rebalancer worker not available (no task store configured)\");\n334\t }\n335\t\n336\t // Start scoped key rotation background task (requires Redis)\n337\t if let Some(ref redis) = state.redis_store {\n338\t let rotation_state = ScopedKeyRotationState {\n339\t config: state.admin.config.clone(),\n340\t redis: redis.clone(),\n341\t pod_id: state.pod_id.clone(),\n342\t };\n343\t tokio::spawn(async move {\n344\t scoped_key_rotation::run_scoped_key_rotator(rotation_state).await;\n345\t });\n346\t\n347\t // Start admin session revocation Pub/Sub subscriber (plan §9).\n348\t // When any pod revokes a session (logout), the session ID is published\n349\t // to `miroir:admin_session:revoked`. Every pod subscribes and adds the\n350\t // ID to its in-memory DashMap, ensuring revoked cookies are rejected\n351\t // across all pods within milliseconds.\n352\t let revoked_sessions = state.auth.revoked_sessions.clone();\n353\t let revoked_total = state.auth.admin_session_revoked_total.clone();\n354\t let redis_url = config.task_store.url.clone();\n355\t let key_prefix = redis.key_prefix().to_string();\n356\t tokio::spawn(async move {\n357\t info!(\"starting admin session revocation subscriber\");\n358\t if let Err(e) = miroir_core::task_store::RedisTaskStore::subscribe_session_revocations(\n359\t &redis_url,\n360\t &key_prefix,\n361\t move |session_id: String| {\n362\t revoked_sessions.insert(session_id, ());\n363\t revoked_total.inc();\n364\t },\n365\t )\n366\t .await\n367\t {\n368\t error!(error = %e, \"admin session revocation subscriber exited with error\");\n369\t }\n370\t });\n371\t }\n372\t\n373\t // Load aliases from task store on startup (plan §13.7)\n374\t // Aliases must be loaded before any request routing to ensure consistent resolution\n375\t if let Some(ref task_store) = state.admin.task_store {\n376\t let alias_registry = state.admin.alias_registry.clone();\n377\t let store = task_store.clone();\n378\t tokio::spawn(async move {\n379\t info!(\"loading aliases from task store\");\n380\t match alias_registry.sync_from_store(&*store).await {\n381\t Ok(()) => {\n382\t let count = alias_registry.list().await.len();\n383\t info!(count, \"aliases loaded successfully\");\n384\t }\n385\t Err(e) => {\n386\t error!(error = %e, \"failed to load aliases from task store\");\n387\t }\n388\t }\n389\t });\n390\t } else {\n391\t info!(\"alias loading skipped (no task store configured)\");\n392\t }\n393\t\n394\t // Start drift reconciler background task (plan §13.5)\n395\t // Uses the drift_reconciler from AppState which is already configured\n396\t if let Some(ref drift_reconciler) = state.admin.drift_reconciler {\n397\t let drift_reconciler = drift_reconciler.clone();\n398\t tokio::spawn(async move {\n399\t info!(\"drift reconciler started\");\n400\t drift_reconciler.run().await;\n401\t error!(\"drift reconciler exited unexpectedly\");\n402\t });\n403\t } else {\n404\t info!(\"drift reconciler not available (no task store configured)\");\n405\t }\n406\t\n407\t // Start peer discovery refresh loop (plan §14.5)\n408\t // Periodically performs SRV lookups to discover peer pods\n409\t if let Some(ref peer_discovery) = state.peer_discovery {\n410\t let peer_discovery = peer_discovery.clone();\n411\t let metrics = state.metrics.clone();\n412\t let refresh_interval_s = config.peer_discovery.refresh_interval_s;\n413\t tokio::spawn(async move {\n414\t let mut interval = tokio::time::interval(Duration::from_secs(refresh_interval_s));\n415\t info!(\n416\t interval_s = refresh_interval_s,\n417\t \"peer discovery refresh loop started\"\n418\t );\n419\t loop {\n420\t interval.tick().await;\n421\t match peer_discovery.refresh().await {\n422\t Ok(peer_set) => {\n423\t let count = peer_set.len() as u64;\n424\t info!(\n425\t peer_count = count,\n426\t \"peer discovery refresh completed\"\n427\t );\n428\t metrics.set_peer_pod_count(count);\n429\t }\n430\t Err(e) => {\n431\t error!(error = %e, \"peer discovery refresh failed\");\n432\t }\n433\t }\n434\t }\n435\t });\n436\t } else {\n437\t info!(\"peer discovery disabled (not running in Kubernetes)\");\n438\t }\n439\t\n440\t // Start task registry TTL pruner background task (plan §4, Phase 3)\n441\t // Runs on single-pod with advisory lock; Phase 6 §14.5 Mode A replaces with rendezvous\n442\t if let Some(ref store) = state.admin.task_store {\n443\t let store = store.clone();\n444\t let pruner_config = config.task_registry.clone();\n445\t tokio::spawn(async move {\n446\t // The pruner runs in its own thread via spawn_pruner\n447\t let _pruner_handle = task_pruner::spawn_pruner(store, pruner_config);\n448\t // The handle is dropped here only on process exit\n449\t info!(\"task registry TTL pruner started\");\n450\t // Keep this task alive forever\n451\t std::future::pending::<()>().await;\n452\t });\n453\t } else {\n454\t info!(\"task registry TTL pruner not available (no task store)\");\n455\t }\n456\t\n457\t // Start canary runner background task (plan §13.18)\n458\t // Only enabled when canary_runner.enabled = true and Redis is available\n459\t if config.canary_runner.enabled {\n460\t if let Some(ref redis) = state.redis_store {\n461\t let store: Arc = Arc::from(redis.clone());\n462\t let canary_config = config.canary_runner.clone();\n463\t\n464\t // Clone config values for the search executor\n465\t let search_config = config.clone();\n466\t let search_executor: miroir_core::canary::SearchExecutor = Arc::new(\n467\t move |index_uid: &str, query: &SearchQuery| -> std::pin::Pin> + Send>> {\n468\t let index_uid = index_uid.to_string();\n469\t let query = query.clone();\n470\t let config = search_config.clone();\n471\t\n472\t Box::pin(async move {\n473\t // For canary queries, we execute against the first available healthy node\n474\t let node_addresses: Vec<_> = config.nodes.iter()\n475\t .map(|n| n.address.clone())\n476\t .collect();\n477\t\n478\t for address in node_addresses {\n479\t let client = match reqwest::Client::builder()\n480\t .timeout(std::time::Duration::from_millis(config.scatter.node_timeout_ms))\n481\t .build()\n482\t {\n483\t Ok(c) => c,\n484\t Err(_) => continue,\n485\t };\n486\t\n487\t let url = format!(\"{}/indexes/{}/search\", address.trim_end_matches('/'), index_uid);\n488\t\n489\t // Build the search request body\n490\t let mut body = match serde_json::to_value(&query) {\n491\t Ok(v) => v,\n492\t Err(e) => return Err(miroir_core::error::MiroirError::InvalidRequest(format!(\"Failed to serialize query: {}\", e))),\n493\t };\n494\t\n495\t // Add limit to avoid large responses for canary queries\n496\t if !body.get(\"limit\").and_then(|v| v.as_u64()).is_some() {\n497\t body[\"limit\"] = serde_json::json!(20);\n498\t }\n499\t\n500\t let response = match client.post(&url)\n501\t .header(\"Authorization\", format!(\"Bearer {}\", config.node_master_key))\n502\t .json(&body)\n503\t .send()\n504\t .await\n505\t {\n506\t Ok(r) => r,\n507\t Err(_) => continue,\n508\t };\n509\t\n510\t if response.status().is_success() {\n511\t if let Ok(text) = response.text().await {\n512\t if let Ok(search_response) = serde_json::from_str::(&text) {\n513\t return Ok(search_response);\n514\t }\n515\t }\n516\t }\n517\t }\n518\t\n519\t // All nodes failed\n520\t Err(miroir_core::error::MiroirError::Topology(\n521\t \"All nodes failed for canary query\".to_string()\n522\t ))\n523\t })\n524\t }\n525\t );\n526\t\n527\t // Create metrics emitter callback\n528\t let metrics_for_canary = state.metrics.clone();\n529\t let metrics_emitter: miroir_core::canary::MetricsEmitter = Arc::new(\n530\t move |result| {\n531\t use miroir_core::canary::CanaryStatus;\n532\t let result_str = match result.status {\n533\t CanaryStatus::Passed => \"passed\",\n534\t CanaryStatus::Failed => \"failed\",\n535\t CanaryStatus::Error => \"error\",\n536\t };\n537\t metrics_for_canary.inc_canary_runs(&result.canary_id, result_str);\n538\t metrics_for_canary.observe_canary_latency_ms(&result.canary_id, result.latency_ms as f64);\n539\t\n540\t for failure in &result.failed_assertions {\n541\t metrics_for_canary.inc_canary_assertion_failures(&result.canary_id, &failure.assertion_type);\n542\t }\n543\t }\n544\t );\n545\t\n546\t // Create settings version checker callback\n547\t let store_for_version = store.clone();\n548\t let version_config = config.clone();\n549\t let settings_version_checker: miroir_core::canary::SettingsVersionChecker = Arc::new(\n550\t move |index_uid: &str| -> Option {\n551\t // Try to get the settings version from the task store\n552\t let node_ids: Vec = version_config.nodes.iter()\n553\t .map(|n| n.id.clone())\n554\t .collect();\n555\t\n556\t let mut min_version: Option = None;\n557\t for node_id in node_ids {\n558\t if let Ok(Some(row)) = store_for_version.get_node_settings_version(index_uid, &node_id) {\n559\t match min_version {\n560\t None => min_version = Some(row.version),\n561\t Some(current) if row.version < current => min_version = Some(row.version),\n562\t _ => {}\n563\t }\n564\t }\n565\t }\n566\t min_version\n567\t }\n568\t );\n569\t\n570\t // Create and start the canary runner\n571\t let runner = CanaryRunner::new(\n572\t store,\n573\t canary_config.max_concurrent_canaries as usize,\n574\t canary_config.run_history_per_canary as usize,\n575\t search_executor,\n576\t metrics_emitter,\n577\t settings_version_checker,\n578\t );\n579\t\n580\t tokio::spawn(async move {\n581\t info!(\"canary runner started\");\n582\t if let Err(e) = runner.start().await {\n583\t error!(\"canary runner exited: {}\", e);\n584\t }\n585\t });\n586\t } else {\n587\t info!(\"canary runner enabled but Redis not available - skipping\");\n588\t }\n589\t }\n590\t\n591\t // Build the main app router with UnifiedState\n592\t let app = Router::new()\n593\t .route(\"/health\", get(health::get_health))\n594\t .route(\"/version\", get(version::get_version::))\n595\t .route(\"/stats\", get(indexes::global_stats_handler))\n596\t .route(\"/multi-search\", post(multi_search::multi_search::)) // §13.11\n597\t .nest(\"/_miroir\", admin::router::())\n598\t .nest(\"/indexes\", indexes::router::())\n599\t .nest(\"/keys\", keys::router::())\n600\t .nest(\"/search\", search::router::())\n601\t .nest(\"/settings\", settings::router::())\n602\t .nest(\"/tasks\", tasks::router::())\n603\t // IMPORTANT: Layer order matters! Last layer() call = outermost = runs first.\n604\t // The middleware stack (from outermost to innermost):\n605\t // 1. csrf_middleware - runs first\n606\t // 2. auth_middleware\n607\t // 3. Extension layers\n608\t // 4. session_pinning_middleware - extracts X-Miroir-Session header\n609\t // 5. request_id_middleware - sets X-Request-Id header\n610\t // 6. telemetry_middleware - reads X-Request-Id, creates tracing span with request_id field\n611\t // The span's request_id field propagates to all child log events via with_current_span(true)\n612\t //\n613\t // To achieve this order, we add layers in REVERSE (last call = outermost):\n614\t .layer(axum::middleware::from_fn_with_state(\n615\t TelemetryState {\n616\t metrics: state.metrics.clone(),\n617\t pod_id: state.pod_id.clone(),\n618\t },\n619\t middleware::telemetry_middleware,\n620\t ))\n621\t .layer(axum::middleware::from_fn(\n622\t middleware::request_id_middleware,\n623\t ))\n624\t .layer(axum::middleware::from_fn(\n625\t middleware::session_pinning_middleware,\n626\t ))\n627\t .layer(axum::extract::DefaultBodyLimit::max(\n628\t config.server.max_body_bytes as usize,\n629\t ))\n630\t .layer(axum::Extension(state.admin.config.clone()))\n631\t .layer(axum::Extension(std::sync::Arc::new(state.admin.clone())))\n632\t .layer(axum::middleware::from_fn_with_state(\n633\t state.auth.clone(),\n634\t auth::auth_middleware,\n635\t ))\n636\t .layer(axum::middleware::from_fn_with_state(\n637\t auth::CsrfState {\n638\t auth: state.auth.clone(),\n639\t redis_store: state.redis_store.clone(),\n640\t },\n641\t auth::csrf_middleware,\n642\t ))\n643\t .with_state(state.clone());\n644\t\n645\t let main_addr: SocketAddr = format!(\"{}:{}\", config.server.bind, config.server.port)\n646\t .parse()\n647\t .map_err(|e| anyhow::anyhow!(\"Invalid bind address: {}\", e))?;\n648\t let metrics_addr: SocketAddr = SocketAddr::from(([0, 0, 0, 0], 9090));\n649\t\n650\t info!(\n651\t main_addr = %main_addr,\n652\t metrics_addr = %metrics_addr,\n653\t \"listening\"\n654\t );\n655\t\n656\t // Create listeners\n657\t let main_listener = tokio::net::TcpListener::bind(main_addr).await?;\n658\t let metrics_listener = tokio::net::TcpListener::bind(metrics_addr).await?;\n659\t\n660\t // Spawn main server with graceful shutdown\n661\t let main_server = axum::serve(main_listener, app)\n662\t .with_graceful_shutdown(shutdown_signal());\n663\t\n664\t // Spawn metrics server with graceful shutdown\n665\t let metrics_app = metrics_router().with_state(state.metrics.clone());\n666\t let metrics_server = axum::serve(metrics_listener, metrics_app)\n667\t .with_graceful_shutdown(shutdown_signal());\n668\t\n669\t // Run both servers concurrently\n670\t let (main_result, metrics_result) = tokio::join!(\n671\t main_server,\n672\t metrics_server\n673\t );\n674\t\n675\t // Check for errors\n676\t if let Err(e) = main_result {\n677\t error!(\"main server error: {}\", e);\n678\t }\n679\t if let Err(e) = metrics_result {\n680\t error!(\"metrics server error: {}\", e);\n681\t }\n682\t\n683\t Ok(())\n684\t}\n685\t\n686\t/// Background health checker - promotes nodes to Active when reachable.\n687\t///\n688\t/// On each tick it also updates the Prometheus metrics for node health,\n689\t/// shard coverage, shard distribution, and degraded shard count.\n690\tasync fn run_health_checker(state: admin_endpoints::AppState) {\n691\t let mut interval = tokio::time::interval(Duration::from_millis(\n692\t state.config.health.interval_ms,\n693\t ));\n694\t\n695\t loop {\n696\t interval.tick().await;\n697\t\n698\t let mut topo = state.topology.write().await;\n699\t let mut all_healthy = true;\n700\t\n701\t // Collect node IDs to iterate\n702\t let node_ids: Vec<_> = topo.nodes().map(|n| n.id.clone()).collect();\n703\t\n704\t for node_id in &node_ids {\n705\t // Get current node status\n706\t let current_status = topo.node(node_id).map(|n| n.status);\n707\t\n708\t // Skip nodes that are already Active/Healthy\n709\t if let Some(NodeStatus::Active) | Some(NodeStatus::Healthy) = current_status {\n710\t continue;\n711\t }\n712\t\n713\t // Get node address\n714\t let node_address = match topo.node(node_id) {\n715\t Some(n) => n.address.clone(),\n716\t None => {\n717\t all_healthy = false;\n718\t continue;\n719\t }\n720\t };\n721\t\n722\t // Try to reach the node\n723\t let client = match reqwest::Client::builder()\n724\t .timeout(Duration::from_millis(state.config.health.timeout_ms))\n725\t .build()\n726\t {\n727\t Ok(c) => c,\n728\t Err(_) => {\n729\t all_healthy = false;\n730\t continue;\n731\t }\n732\t };\n733\t\n734\t let url = format!(\"{}/health\", node_address.trim_end_matches('/'));\n735\t let result = client.get(&url).send().await;\n736\t\n737\t if result.is_ok() && result.unwrap().status().is_success() {\n738\t // Node is reachable - promote to Active\n739\t if let Some(node) = topo.node_mut(node_id) {\n740\t let _ = node.transition_to(NodeStatus::Active);\n741\t info!(node_id = %node_id, \"node promoted to Active\");\n742\t }\n743\t } else {\n744\t all_healthy = false;\n745\t }\n746\t }\n747\t\n748\t // Update node health gauges (§10 node metrics)\n749\t for node_id in &node_ids {\n750\t let healthy = topo.node(node_id).map(|n| n.is_healthy()).unwrap_or(false);\n751\t state.metrics.set_node_healthy(node_id.as_str(), healthy);\n752\t }\n753\t\n754\t // Compute and update shard metrics (§10 shard metrics)\n755\t update_shard_metrics(&topo, &state.metrics);\n756\t\n757\t // Update task registry size gauge\n758\t let task_count = state.task_registry.count();\n759\t state.metrics.set_task_registry_size(task_count as f64);\n760\t\n761\t // Sync rebalancer metrics to Prometheus\n762\t state.sync_rebalancer_metrics_to_prometheus().await;\n763\t\n764\t // Mark ready once all configured nodes are reachable\n765\t if all_healthy && !state.config.nodes.is_empty() {\n766\t state.mark_ready().await;\n767\t }\n768\t\n769\t // Update §14.9 resource-pressure metrics\n770\t update_resource_pressure_metrics(&state.metrics);\n771\t\n772\t // Update §13.6 session pinning metrics\n773\t state.session_manager.update_metrics(|count| {\n774\t state.metrics.set_session_active_count(count as u64);\n775\t });\n776\t\n777\t // Prune expired sessions (plan §13.6)\n778\t let pruned = state.session_manager.prune_expired().await;\n779\t if pruned > 0 {\n780\t info!(\n781\t pruned_count = pruned,\n782\t \"pruned expired sessions\"\n783\t );\n784\t }\n785\t }\n786\t}\n787\t\n788\t/// Compute shard coverage, degraded count, and per-node shard distribution\n789\t/// from the current topology and update the corresponding Prometheus gauges.\n790\tfn update_shard_metrics(topo: &Topology, metrics: &middleware::Metrics) {\n791\t let node_map = topo.node_map();\n792\t let mut healthy_shards = 0u64;\n793\t let mut degraded_shards = 0u64;\n794\t\n795\t // Per-node shard count\n796\t let mut node_shard_counts: std::collections::HashMap =\n797\t std::collections::HashMap::new();\n798\t\n799\t for shard_id in 0..topo.shards {\n800\t let mut has_healthy_replica = false;\n801\t for group in topo.groups() {\n802\t let assigned = miroir_core::router::assign_shard_in_group(\n803\t shard_id, group.nodes(), topo.rf(),\n804\t );\n805\t for node_id in &assigned {\n806\t let healthy = node_map\n807\t .get(node_id)\n808\t .map(|n| n.is_healthy())\n809\t .unwrap_or(false);\n810\t if healthy {\n811\t has_healthy_replica = true;\n812\t *node_shard_counts.entry(node_id.clone()).or_insert(0) += 1;\n813\t }\n814\t }\n815\t }\n816\t if has_healthy_replica {\n817\t healthy_shards += 1;\n818\t } else {\n819\t degraded_shards += 1;\n820\t }\n821\t }\n822\t\n823\t let coverage = if topo.shards > 0 {\n824\t healthy_shards as f64 / topo.shards as f64\n825\t } else {\n826\t 1.0\n827\t };\n828\t metrics.set_shard_coverage(coverage);\n829\t metrics.set_degraded_shards(degraded_shards as f64);\n830\t\n831\t for (node_id, count) in &node_shard_counts {\n832\t metrics.set_shard_distribution(node_id.as_str(), *count as f64);\n833\t }\n834\t}\n835\t\n836\t/// Read cgroup v2 memory pressure and update §14.9 resource-pressure gauges.\n837\t///\n838\t/// In Kubernetes each container has its own cgroup; the paths below are the\n839\t/// standard cgroup v2 mount points. If the files don't exist (e.g. local dev\n840\t/// on macOS) the metrics remain at their zero defaults.\n841\tfn update_resource_pressure_metrics(metrics: &middleware::Metrics) {\n842\t // ── Memory pressure ──\n843\t // cgroup v2: /sys/fs/cgroup/memory.current and memory.max\n844\t let mem_current = read_cgroup_metric(\"/sys/fs/cgroup/memory.current\");\n845\t let mem_max = read_cgroup_metric(\"/sys/fs/cgroup/memory.max\");\n846\t\n847\t if let (Some(current), Some(max)) = (mem_current, mem_max) {\n848\t if max > 0 {\n849\t let ratio = current as f64 / max as f64;\n850\t let level = if ratio > 0.90 { 2 } else if ratio > 0.75 { 1 } else { 0 };\n851\t metrics.set_memory_pressure(level);\n852\t }\n853\t }\n854\t\n855\t // ── CPU throttling ──\n856\t // cgroup v2: /sys/fs/cgroup/cpu.stat contains throttle_usec\n857\t if let Ok(contents) = std::fs::read_to_string(\"/sys/fs/cgroup/cpu.stat\") {\n858\t for line in contents.lines() {\n859\t if let Some(rest) = line.strip_prefix(\"throttled_usec \") {\n860\t if let Ok(usec) = rest.trim().parse::() {\n861\t // Report delta — the counter is cumulative, so we report\n862\t // the raw value and let Prometheus handle rate().\n863\t // For simplicity we set the counter to the absolute value\n864\t // (Prometheus counters are monotonic; since this is called\n865\t // periodically, we just inc by the new delta).\n866\t // Actually, the metric is a Counter, so we can only inc it.\n867\t // We'll read the previous throttled value from a thread-local.\n868\t // Simpler approach: just report the current throttle time\n869\t // as a one-shot increment if non-zero.\n870\t metrics.inc_cpu_throttled_seconds(usec / 1_000_000.0);\n871\t }\n872\t }\n873\t }\n874\t }\n875\t\n876\t // ── Peer pod count and leader status ──\n877\t // Peer pod count is now set by peer discovery refresh loop (plan §14.5).\n878\t // Leader election is not yet implemented (plan §14.5 Mode B).\n879\t // Owned shards count will be set by Mode A rendezvous (plan §14.5).\n880\t metrics.set_leader(true);\n881\t metrics.set_owned_shards_count(0);\n882\t}\n883\t\n884\t/// Read a single integer value from a cgroup pseudo-file.\n885\tfn read_cgroup_metric(path: &str) -> Option {\n886\t std::fs::read_to_string(path)\n887\t .ok()\n888\t .and_then(|s| s.trim().parse::().ok())\n889\t}\n890\t\n891\t/// Graceful shutdown signal handler.\n892\tasync fn shutdown_signal() {\n893\t let ctrl_c = async {\n894\t signal::ctrl_c()\n895\t .await\n896\t .expect(\"failed to install Ctrl+C handler\");\n897\t };\n898\t\n899\t #[cfg(unix)]\n900\t let terminate = async {\n901\t signal::unix::signal(signal::unix::SignalKind::terminate())\n902\t .expect(\"failed to install signal handler\")\n903\t .recv()\n904\t .await;\n905\t };\n906\t\n907\t #[cfg(not(unix))]\n908\t let terminate = std::future::pending::<()>;\n909\t\n910\t tokio::select! {\n911\t _ = ctrl_c => {},\n912\t _ = terminate => {},\n913\t }\n914\t\n915\t info!(\"shutdown signal received, draining in-flight requests...\");\n916\t\n917\t // Shutdown OpenTelemetry to flush any pending traces\n918\t otel::shutdown_otel();\n919\t}\n920\t"}]},"parent_tool_use_id":"call_fbc4ae069de4433aa2e41c0c","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"7f969d86-40c7-484c-ab44-aae9217df42a","timestamp":"2026-05-23T06:22:58.398Z"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_523a595f068b43b59ec6b6e4","type":"tool_result","content":"1\t//! Structured logging, request IDs, and Prometheus metrics middleware.\n2\t\n3\tuse std::time::Instant;\n4\t\n5\tuse axum::{\n6\t extract::{Request, State},\n7\t http::{HeaderMap, HeaderValue},\n8\t middleware::Next,\n9\t response::Response,\n10\t Router,\n11\t routing::get,\n12\t};\n13\tuse miroir_core::config::MiroirConfig;\n14\tuse prometheus::{\n15\t Counter, CounterVec, Encoder, Gauge, GaugeVec, Histogram, HistogramOpts, HistogramVec, Opts,\n16\t Registry, TextEncoder,\n17\t};\n18\tuse tracing::info_span;\n19\tuse uuid::Uuid;\n20\tuse hex;\n21\tuse std::collections::hash_map::DefaultHasher;\n22\tuse std::hash::{Hash, Hasher};\n23\t\n24\t/// Request ID wrapper type for storing in axum Request extensions.\n25\t///\n26\t/// This is a newtype wrapper around the 8-character hex request ID,\n27\t/// allowing handlers to extract it via `Request.extensions().get::()`.\n28\t#[derive(Clone, Debug, PartialEq, Eq, Hash)]\n29\tpub struct RequestId(pub String);\n30\t\n31\timpl RequestId {\n32\t /// Create a new RequestId from a UUIDv7.\n33\t ///\n34\t /// Hashes the full UUIDv7 to produce an 8-character hex ID that is unique\n35\t /// even for consecutive calls within the same millisecond.\n36\t pub fn new() -> Self {\n37\t let uuid = Uuid::now_v7();\n38\t let bytes = uuid.as_bytes();\n39\t // Hash the full UUID to ensure uniqueness even within the same millisecond\n40\t let mut hasher = DefaultHasher::new();\n41\t hasher.write(bytes);\n42\t let hash = hasher.finish();\n43\t // Take first 8 hex chars of 64-bit hash (32 bits is sufficient entropy)\n44\t Self(format!(\"{:08x}\", hash as u32))\n45\t }\n46\t\n47\t /// Get the inner request ID string.\n48\t pub fn as_str(&self) -> &str {\n49\t &self.0\n50\t }\n51\t\n52\t /// Parse a RequestId from a string.\n53\t pub fn parse(s: String) -> Option {\n54\t if s.len() == 8 && s.chars().all(|c| c.is_ascii_hexdigit()) {\n55\t Some(Self(s))\n56\t } else {\n57\t None\n58\t }\n59\t }\n60\t}\n61\t\n62\t/// Session ID wrapper type for read-your-writes session pinning (plan §13.6).\n63\t///\n64\t/// Extracted from the `X-Miroir-Session` header and stored in request extensions.\n65\t/// Handlers can access it via `Request.extensions().get::()`.\n66\t#[derive(Clone, Debug, PartialEq, Eq, Hash)]\n67\tpub struct SessionId(pub String);\n68\t\n69\timpl Default for SessionId {\n70\t fn default() -> Self {\n71\t Self(String::new())\n72\t }\n73\t}\n74\t\n75\timpl SessionId {\n76\t /// Get the inner session ID string.\n77\t pub fn as_str(&self) -> &str {\n78\t &self.0\n79\t }\n80\t\n81\t /// Parse a SessionId from a string.\n82\t ///\n83\t /// Accepts any non-empty string (client-provided UUID or identifier).\n84\t pub fn parse(s: String) -> Option {\n85\t if !s.is_empty() && s.len() <= 256 {\n86\t Some(Self(s))\n87\t } else {\n88\t None\n89\t }\n90\t }\n91\t}\n92\t\n93\tpub async fn request_id_middleware(\n94\t mut req: Request,\n95\t next: Next,\n96\t) -> Response {\n97\t // Check for existing request ID in headers\n98\t let request_id = req\n99\t .headers()\n100\t .get(\"x-request-id\")\n101\t .and_then(|v| v.to_str().ok())\n102\t .and_then(|s| RequestId::parse(s.to_string()))\n103\t .unwrap_or_else(RequestId::new);\n104\t\n105\t // Store in request extensions for handler access\n106\t req.extensions_mut().insert(request_id.clone());\n107\t\n108\t // Set X-Request-Id header on request (for telemetry_middleware to read)\n109\t if let Ok(val) = HeaderValue::from_str(request_id.as_str()) {\n110\t req.headers_mut().insert(\"x-request-id\", val);\n111\t }\n112\t\n113\t // Process the request\n114\t let mut response = next.run(req).await;\n115\t\n116\t // Add X-Request-Id header to response (override if exists)\n117\t if let Ok(val) = HeaderValue::from_str(request_id.as_str()) {\n118\t response.headers_mut().insert(\"x-request-id\", val);\n119\t }\n120\t\n121\t response\n122\t}\n123\t\n124\t/// Session pinning middleware (plan §13.6).\n125\t///\n126\t/// Extracts the `X-Miroir-Session` header and stores it in request extensions\n127\t/// for handlers to access via `Request.extensions().get::()`.\n128\tpub async fn session_pinning_middleware(\n129\t mut req: Request,\n130\t next: Next,\n131\t) -> Response {\n132\t // Extract session ID from header if present\n133\t let session_id = req\n134\t .headers()\n135\t .get(\"x-miroir-session\")\n136\t .and_then(|v| v.to_str().ok())\n137\t .and_then(|s| SessionId::parse(s.to_string()));\n138\t\n139\t // Store in request extensions for handler access\n140\t if let Some(sid) = session_id {\n141\t req.extensions_mut().insert(sid);\n142\t }\n143\t\n144\t next.run(req).await\n145\t}\n146\t\n147\t\n148\t/// Telemetry state combining metrics and pod_id for middleware.\n149\t#[derive(Clone)]\n150\tpub struct TelemetryState {\n151\t pub metrics: Metrics,\n152\t pub pod_id: String,\n153\t}\n154\t\n155\timpl TelemetryState {\n156\t pub fn new(metrics: Metrics) -> Self {\n157\t let pod_id = std::env::var(\"POD_NAME\").unwrap_or_else(|_| \"unknown\".to_string());\n158\t Self { metrics, pod_id }\n159\t }\n160\t}\n161\t\n162\t/// Global metrics registry shared across all middleware instances.\n163\tpub struct Metrics {\n164\t registry: Registry,\n165\t\n166\t // ── Request metrics ──\n167\t request_duration: HistogramVec,\n168\t requests_total: CounterVec,\n169\t requests_in_flight: Gauge,\n170\t\n171\t // ── Node health metrics ──\n172\t node_healthy: GaugeVec,\n173\t node_request_duration: HistogramVec,\n174\t node_errors: CounterVec,\n175\t\n176\t // ── Shard metrics ──\n177\t shard_coverage: Gauge,\n178\t degraded_shards: Gauge,\n179\t shard_distribution: GaugeVec,\n180\t\n181\t // ── Task metrics ──\n182\t task_processing_age: Histogram,\n183\t tasks_total: CounterVec,\n184\t task_registry_size: Gauge,\n185\t\n186\t // ── Scatter-gather metrics ──\n187\t scatter_fan_out_size: Histogram,\n188\t scatter_partial_responses: Counter,\n189\t scatter_retries: Counter,\n190\t\n191\t // ── Rebalancer metrics ──\n192\t rebalance_in_progress: Gauge,\n193\t rebalance_documents_migrated: Counter,\n194\t rebalance_duration: Histogram,\n195\t\n196\t // ── §13.11 Multi-search metrics (feature-gated) ──\n197\t multisearch_queries_per_batch: Option,\n198\t multisearch_batches_total: Option,\n199\t multisearch_partial_failures_total: Option,\n200\t multisearch_tenant_session_pin_override_total: Option,\n201\t\n202\t // ── §13.12 Vector search metrics (feature-gated) ──\n203\t vector_search_over_fetched_total: Option,\n204\t vector_merge_strategy: Option,\n205\t vector_embedder_drift_total: Option,\n206\t\n207\t // ── §13.13 CDC metrics (feature-gated) ──\n208\t cdc_events_published_total: Option,\n209\t cdc_lag_seconds: Option,\n210\t cdc_buffer_bytes: Option,\n211\t cdc_dropped_total: Option,\n212\t cdc_events_suppressed_total: Option,\n213\t\n214\t // ── §13.14 TTL metrics (feature-gated) ──\n215\t ttl_documents_expired_total: Option,\n216\t ttl_sweep_duration_seconds: Option,\n217\t ttl_pending_estimate: Option,\n218\t\n219\t // ── §13.15 Tenant affinity metrics (feature-gated) ──\n220\t tenant_queries_total: Option,\n221\t tenant_pinned_groups: Option,\n222\t tenant_fallback_total: Option,\n223\t\n224\t // ── §13.16 Shadow traffic metrics (feature-gated) ──\n225\t shadow_diff_total: Option,\n226\t shadow_kendall_tau: Option,\n227\t shadow_latency_delta_seconds: Option,\n228\t shadow_errors_total: Option,\n229\t\n230\t // ── §13.17 ILM metrics (feature-gated) ──\n231\t rollover_events_total: Option,\n232\t rollover_active_indexes: Option,\n233\t rollover_documents_expired_total: Option,\n234\t rollover_last_action_seconds: Option,\n235\t\n236\t // ── §13.18 Canary metrics (feature-gated) ──\n237\t canary_runs_total: Option,\n238\t canary_latency_ms: Option,\n239\t canary_assertion_failures_total: Option,\n240\t\n241\t // ── §13.19 Admin UI metrics (feature-gated) ──\n242\t admin_ui_sessions_total: Option,\n243\t admin_ui_action_total: Option,\n244\t admin_ui_destructive_action_total: Option,\n245\t\n246\t // ── §13.20 Explain metrics (feature-gated) ──\n247\t explain_requests_total: Option,\n248\t explain_warnings_total: Option,\n249\t explain_execute_total: Option,\n250\t\n251\t // ── §13.21 Search UI metrics (feature-gated) ──\n252\t search_ui_sessions_total: Option,\n253\t search_ui_queries_total: Option,\n254\t search_ui_zero_hits_total: Option,\n255\t search_ui_click_through_total: Option,\n256\t search_ui_p95_ms: Option,\n257\t\n258\t // ── §14.9 Resource-pressure metrics (always present) ──\n259\t memory_pressure: Gauge,\n260\t cpu_throttled_seconds_total: Counter,\n261\t request_queue_depth: Gauge,\n262\t background_queue_depth: GaugeVec,\n263\t peer_pod_count: Gauge,\n264\t leader: Gauge,\n265\t owned_shards_count: Gauge,\n266\t\n267\t // ── Admin session sealing metrics (always present) ──\n268\t admin_session_key_generated: Gauge,\n269\t admin_session_revoked_total: Counter,\n270\t\n271\t // ── §13.5 Two-phase settings broadcast metrics (always present) ──\n272\t settings_broadcast_phase: GaugeVec,\n273\t settings_hash_mismatch_total: Counter,\n274\t settings_drift_repair_total: CounterVec,\n275\t settings_version: GaugeVec,\n276\t\n277\t // ── §13.7 Alias metrics (always present) ──\n278\t alias_resolutions_total: CounterVec,\n279\t alias_flips_total: CounterVec,\n280\t\n281\t // ── §13.6 Session pinning metrics (always present) ──\n282\t session_active_count: Gauge,\n283\t session_pin_enforced_total: CounterVec,\n284\t session_wait_duration_seconds: Histogram,\n285\t session_wait_timeout_total: CounterVec,\n286\t}\n287\t\n288\timpl Clone for Metrics {\n289\t fn clone(&self) -> Self {\n290\t Self {\n291\t registry: self.registry.clone(),\n292\t request_duration: self.request_duration.clone(),\n293\t requests_total: self.requests_total.clone(),\n294\t requests_in_flight: self.requests_in_flight.clone(),\n295\t node_healthy: self.node_healthy.clone(),\n296\t node_request_duration: self.node_request_duration.clone(),\n297\t node_errors: self.node_errors.clone(),\n298\t shard_coverage: self.shard_coverage.clone(),\n299\t degraded_shards: self.degraded_shards.clone(),\n300\t shard_distribution: self.shard_distribution.clone(),\n301\t task_processing_age: self.task_processing_age.clone(),\n302\t tasks_total: self.tasks_total.clone(),\n303\t task_registry_size: self.task_registry_size.clone(),\n304\t scatter_fan_out_size: self.scatter_fan_out_size.clone(),\n305\t scatter_partial_responses: self.scatter_partial_responses.clone(),\n306\t scatter_retries: self.scatter_retries.clone(),\n307\t rebalance_in_progress: self.rebalance_in_progress.clone(),\n308\t rebalance_documents_migrated: self.rebalance_documents_migrated.clone(),\n309\t rebalance_duration: self.rebalance_duration.clone(),\n310\t multisearch_queries_per_batch: self.multisearch_queries_per_batch.clone(),\n311\t multisearch_batches_total: self.multisearch_batches_total.clone(),\n312\t multisearch_partial_failures_total: self.multisearch_partial_failures_total.clone(),\n313\t multisearch_tenant_session_pin_override_total: self.multisearch_tenant_session_pin_override_total.clone(),\n314\t vector_search_over_fetched_total: self.vector_search_over_fetched_total.clone(),\n315\t vector_merge_strategy: self.vector_merge_strategy.clone(),\n316\t vector_embedder_drift_total: self.vector_embedder_drift_total.clone(),\n317\t cdc_events_published_total: self.cdc_events_published_total.clone(),\n318\t cdc_lag_seconds: self.cdc_lag_seconds.clone(),\n319\t cdc_buffer_bytes: self.cdc_buffer_bytes.clone(),\n320\t cdc_dropped_total: self.cdc_dropped_total.clone(),\n321\t cdc_events_suppressed_total: self.cdc_events_suppressed_total.clone(),\n322\t ttl_documents_expired_total: self.ttl_documents_expired_total.clone(),\n323\t ttl_sweep_duration_seconds: self.ttl_sweep_duration_seconds.clone(),\n324\t ttl_pending_estimate: self.ttl_pending_estimate.clone(),\n325\t tenant_queries_total: self.tenant_queries_total.clone(),\n326\t tenant_pinned_groups: self.tenant_pinned_groups.clone(),\n327\t tenant_fallback_total: self.tenant_fallback_total.clone(),\n328\t shadow_diff_total: self.shadow_diff_total.clone(),\n329\t shadow_kendall_tau: self.shadow_kendall_tau.clone(),\n330\t shadow_latency_delta_seconds: self.shadow_latency_delta_seconds.clone(),\n331\t shadow_errors_total: self.shadow_errors_total.clone(),\n332\t rollover_events_total: self.rollover_events_total.clone(),\n333\t rollover_active_indexes: self.rollover_active_indexes.clone(),\n334\t rollover_documents_expired_total: self.rollover_documents_expired_total.clone(),\n335\t rollover_last_action_seconds: self.rollover_last_action_seconds.clone(),\n336\t canary_runs_total: self.canary_runs_total.clone(),\n337\t canary_latency_ms: self.canary_latency_ms.clone(),\n338\t canary_assertion_failures_total: self.canary_assertion_failures_total.clone(),\n339\t admin_ui_sessions_total: self.admin_ui_sessions_total.clone(),\n340\t admin_ui_action_total: self.admin_ui_action_total.clone(),\n341\t admin_ui_destructive_action_total: self.admin_ui_destructive_action_total.clone(),\n342\t explain_requests_total: self.explain_requests_total.clone(),\n343\t explain_warnings_total: self.explain_warnings_total.clone(),\n344\t explain_execute_total: self.explain_execute_total.clone(),\n345\t search_ui_sessions_total: self.search_ui_sessions_total.clone(),\n346\t search_ui_queries_total: self.search_ui_queries_total.clone(),\n347\t search_ui_zero_hits_total: self.search_ui_zero_hits_total.clone(),\n348\t search_ui_click_through_total: self.search_ui_click_through_total.clone(),\n349\t search_ui_p95_ms: self.search_ui_p95_ms.clone(),\n350\t memory_pressure: self.memory_pressure.clone(),\n351\t cpu_throttled_seconds_total: self.cpu_throttled_seconds_total.clone(),\n352\t request_queue_depth: self.request_queue_depth.clone(),\n353\t background_queue_depth: self.background_queue_depth.clone(),\n354\t peer_pod_count: self.peer_pod_count.clone(),\n355\t leader: self.leader.clone(),\n356\t owned_shards_count: self.owned_shards_count.clone(),\n357\t admin_session_key_generated: self.admin_session_key_generated.clone(),\n358\t admin_session_revoked_total: self.admin_session_revoked_total.clone(),\n359\t settings_broadcast_phase: self.settings_broadcast_phase.clone(),\n360\t settings_hash_mismatch_total: self.settings_hash_mismatch_total.clone(),\n361\t settings_drift_repair_total: self.settings_drift_repair_total.clone(),\n362\t settings_version: self.settings_version.clone(),\n363\t alias_resolutions_total: self.alias_resolutions_total.clone(),\n364\t alias_flips_total: self.alias_flips_total.clone(),\n365\t session_active_count: self.session_active_count.clone(),\n366\t session_pin_enforced_total: self.session_pin_enforced_total.clone(),\n367\t session_wait_duration_seconds: self.session_wait_duration_seconds.clone(),\n368\t session_wait_timeout_total: self.session_wait_timeout_total.clone(),\n369\t }\n370\t }\n371\t}\n372\t\n373\timpl Default for Metrics {\n374\t fn default() -> Self {\n375\t Self::new(&MiroirConfig::default())\n376\t }\n377\t}\n378\t\n379\timpl Metrics {\n380\t pub fn new(config: &MiroirConfig) -> Self {\n381\t let registry = Registry::new();\n382\t\n383\t // ── Request metrics ──\n384\t let request_duration = HistogramVec::new(\n385\t HistogramOpts::new(\"miroir_request_duration_seconds\", \"Request latency in seconds\")\n386\t .buckets(vec![0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0, 10.0]),\n387\t &[\"method\", \"path_template\", \"status\"],\n388\t )\n389\t .expect(\"failed to create request_duration histogram\");\n390\t\n391\t let requests_total = CounterVec::new(\n392\t Opts::new(\"miroir_requests_total\", \"Total number of requests\"),\n393\t &[\"method\", \"path_template\", \"status\"],\n394\t )\n395\t .expect(\"failed to create requests_total counter\");\n396\t\n397\t let requests_in_flight = Gauge::with_opts(\n398\t Opts::new(\"miroir_requests_in_flight\", \"Number of requests currently being processed\"),\n399\t )\n400\t .expect(\"failed to create requests_in_flight gauge\");\n401\t\n402\t // ── Node health metrics ──\n403\t let node_healthy = GaugeVec::new(\n404\t Opts::new(\"miroir_node_healthy\", \"Health status of backend nodes (1=healthy, 0=unhealthy)\"),\n405\t &[\"node_id\"],\n406\t )\n407\t .expect(\"failed to create node_healthy gauge\");\n408\t\n409\t let node_request_duration = HistogramVec::new(\n410\t HistogramOpts::new(\"miroir_node_request_duration_seconds\", \"Latency of individual node requests\")\n411\t .buckets(vec![0.001, 0.005, 0.01, 0.025, 0.05, 0.1, 0.5, 1.0]),\n412\t &[\"node_id\", \"operation\"],\n413\t )\n414\t .expect(\"failed to create node_request_duration histogram\");\n415\t\n416\t let node_errors = CounterVec::new(\n417\t Opts::new(\"miroir_node_errors_total\", \"Number of errors from backend nodes\"),\n418\t &[\"node_id\", \"error_type\"],\n419\t )\n420\t .expect(\"failed to create node_errors counter\");\n421\t\n422\t // ── Shard metrics ──\n423\t let shard_coverage = Gauge::with_opts(\n424\t Opts::new(\"miroir_shard_coverage\", \"Fraction of shards with at least one healthy replica\"),\n425\t )\n426\t .expect(\"failed to create shard_coverage gauge\");\n427\t\n428\t let degraded_shards = Gauge::with_opts(\n429\t Opts::new(\"miroir_degraded_shards_total\", \"Number of shards with reduced replica availability\"),\n430\t )\n431\t .expect(\"failed to create degraded_shards gauge\");\n432\t\n433\t let shard_distribution = GaugeVec::new(\n434\t Opts::new(\"miroir_shard_distribution\", \"Number of shards assigned to each node\"),\n435\t &[\"node_id\"],\n436\t )\n437\t .expect(\"failed to create shard_distribution gauge\");\n438\t\n439\t // ── Task metrics ──\n440\t let task_processing_age = Histogram::with_opts(\n441\t HistogramOpts::new(\"miroir_task_processing_age_seconds\", \"Time between task creation and processing start\")\n442\t .buckets(vec![0.01, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0, 10.0, 30.0, 60.0]),\n443\t )\n444\t .expect(\"failed to create task_processing_age histogram\");\n445\t\n446\t let tasks_total = CounterVec::new(\n447\t Opts::new(\"miroir_tasks_total\", \"Total number of tasks by status\"),\n448\t &[\"status\"],\n449\t )\n450\t .expect(\"failed to create tasks_total counter\");\n451\t\n452\t let task_registry_size = Gauge::with_opts(\n453\t Opts::new(\"miroir_task_registry_size\", \"Current number of tasks in the registry\"),\n454\t )\n455\t .expect(\"failed to create task_registry_size gauge\");\n456\t\n457\t // ── Scatter-gather metrics ──\n458\t let scatter_fan_out_size = Histogram::with_opts(\n459\t HistogramOpts::new(\"miroir_scatter_fan_out_size\", \"Number of nodes in scatter operations\")\n460\t .buckets(vec![1.0, 2.0, 3.0, 5.0, 10.0, 20.0, 50.0]),\n461\t )\n462\t .expect(\"failed to create scatter_fan_out_size histogram\");\n463\t\n464\t let scatter_partial_responses = Counter::with_opts(\n465\t Opts::new(\"miroir_scatter_partial_responses_total\", \"Number of scatter responses that were partial (some nodes failed)\"),\n466\t )\n467\t .expect(\"failed to create scatter_partial_responses counter\");\n468\t\n469\t let scatter_retries = Counter::with_opts(\n470\t Opts::new(\"miroir_scatter_retries_total\", \"Number of scatter retry attempts due to node failures\"),\n471\t )\n472\t .expect(\"failed to create scatter_retries counter\");\n473\t\n474\t // ── Rebalancer metrics ──\n475\t let rebalance_in_progress = Gauge::with_opts(\n476\t Opts::new(\"miroir_rebalance_in_progress\", \"Whether a rebalance is currently running (1=yes, 0=no)\"),\n477\t )\n478\t .expect(\"failed to create rebalance_in_progress gauge\");\n479\t\n480\t let rebalance_documents_migrated = Counter::with_opts(\n481\t Opts::new(\"miroir_rebalance_documents_migrated_total\", \"Total number of documents migrated during rebalance\"),\n482\t )\n483\t .expect(\"failed to create rebalance_documents_migrated counter\");\n484\t\n485\t let rebalance_duration = Histogram::with_opts(\n486\t HistogramOpts::new(\"miroir_rebalance_duration_seconds\", \"Duration of rebalance operations\")\n487\t .buckets(vec![1.0, 5.0, 10.0, 30.0, 60.0, 300.0, 600.0, 1800.0, 3600.0]),\n488\t )\n489\t .expect(\"failed to create rebalance_duration histogram\");\n490\t\n491\t // Register all metrics\n492\t macro_rules! reg {\n493\t ($m:expr) => {\n494\t registry.register(Box::new($m.clone())).expect(concat!(\"failed to register \", stringify!($m)));\n495\t };\n496\t }\n497\t\n498\t reg!(request_duration);\n499\t reg!(requests_total);\n500\t reg!(requests_in_flight);\n501\t reg!(node_healthy);\n502\t reg!(node_request_duration);\n503\t reg!(node_errors);\n504\t reg!(shard_coverage);\n505\t reg!(degraded_shards);\n506\t reg!(shard_distribution);\n507\t reg!(task_processing_age);\n508\t reg!(tasks_total);\n509\t reg!(task_registry_size);\n510\t reg!(scatter_fan_out_size);\n511\t reg!(scatter_partial_responses);\n512\t reg!(scatter_retries);\n513\t reg!(rebalance_in_progress);\n514\t reg!(rebalance_documents_migrated);\n515\t reg!(rebalance_duration);\n516\t\n517\t // ── §13.11 Multi-search metrics (cardinality cap: top 100 tenants, rest bucketed) ──\n518\t let (\n519\t multisearch_queries_per_batch,\n520\t multisearch_batches_total,\n521\t multisearch_partial_failures_total,\n522\t multisearch_tenant_session_pin_override_total,\n523\t ) = if config.multi_search.enabled {\n524\t let q = Histogram::with_opts(\n525\t HistogramOpts::new(\"miroir_multisearch_queries_per_batch\", \"Number of queries in each multi-search batch\")\n526\t .buckets(vec![1.0, 2.0, 5.0, 10.0, 25.0, 50.0, 100.0]),\n527\t ).expect(\"create multisearch_queries_per_batch\");\n528\t let b = Counter::with_opts(\n529\t Opts::new(\"miroir_multisearch_batches_total\", \"Total number of multi-search batches processed\"),\n530\t ).expect(\"create multisearch_batches_total\");\n531\t let p = Counter::with_opts(\n532\t Opts::new(\"miroir_multisearch_partial_failures_total\", \"Number of multi-search batches with at least one query failure\"),\n533\t ).expect(\"create multisearch_partial_failures_total\");\n534\t let t = CounterVec::new(\n535\t Opts::new(\"miroir_tenant_session_pin_override_total\", \"Session pin overrides triggered by multi-search tenant routing\"),\n536\t &[\"tenant\"],\n537\t ).expect(\"create multisearch_tenant_session_pin_override_total\");\n538\t reg!(q); reg!(b); reg!(p); reg!(t);\n539\t (Some(q), Some(b), Some(p), Some(t))\n540\t } else {\n541\t (None, None, None, None)\n542\t };\n543\t\n544\t // ── §13.12 Vector search metrics ──\n545\t let (\n546\t vector_search_over_fetched_total,\n547\t vector_merge_strategy,\n548\t vector_embedder_drift_total,\n549\t ) = if config.vector_search.enabled {\n550\t let o = Counter::with_opts(\n551\t Opts::new(\"miroir_vector_search_over_fetched_total\", \"Number of vector searches that over-fetched candidates\"),\n552\t ).expect(\"create vector_search_over_fetched_total\");\n553\t let m = CounterVec::new(\n554\t Opts::new(\"miroir_vector_merge_strategy\", \"Count of hybrid merge strategy selections\"),\n555\t &[\"strategy\"],\n556\t ).expect(\"create vector_merge_strategy\");\n557\t let d = Counter::with_opts(\n558\t Opts::new(\"miroir_vector_embedder_drift_total\", \"Number of embedder drift detections\"),\n559\t ).expect(\"create vector_embedder_drift_total\");\n560\t reg!(o); reg!(m); reg!(d);\n561\t (Some(o), Some(m), Some(d))\n562\t } else {\n563\t (None, None, None)\n564\t };\n565\t\n566\t // ── §13.13 CDC metrics (cardinality cap: top 100 sinks, rest bucketed) ──\n567\t let (\n568\t cdc_events_published_total,\n569\t cdc_lag_seconds,\n570\t cdc_buffer_bytes,\n571\t cdc_dropped_total,\n572\t cdc_events_suppressed_total,\n573\t ) = if config.cdc.enabled {\n574\t let e = CounterVec::new(\n575\t Opts::new(\"miroir_cdc_events_published_total\", \"Total CDC events published\"),\n576\t &[\"sink\", \"index\"],\n577\t ).expect(\"create cdc_events_published_total\");\n578\t let l = GaugeVec::new(\n579\t Opts::new(\"miroir_cdc_lag_seconds\", \"CDC delivery lag in seconds\"),\n580\t &[\"sink\"],\n581\t ).expect(\"create cdc_lag_seconds\");\n582\t let b = GaugeVec::new(\n583\t Opts::new(\"miroir_cdc_buffer_bytes\", \"CDC buffer size in bytes\"),\n584\t &[\"sink\"],\n585\t ).expect(\"create cdc_buffer_bytes\");\n586\t let d = CounterVec::new(\n587\t Opts::new(\"miroir_cdc_dropped_total\", \"CDC events dropped due to buffer overflow\"),\n588\t &[\"sink\"],\n589\t ).expect(\"create cdc_dropped_total\");\n590\t let s = CounterVec::new(\n591\t Opts::new(\"miroir_cdc_events_suppressed_total\", \"CDC events suppressed by origin deduplication\"),\n592\t &[\"origin\"],\n593\t ).expect(\"create cdc_events_suppressed_total\");\n594\t reg!(e); reg!(l); reg!(b); reg!(d); reg!(s);\n595\t (Some(e), Some(l), Some(b), Some(d), Some(s))\n596\t } else {\n597\t (None, None, None, None, None)\n598\t };\n599\t\n600\t // ── §13.14 TTL metrics (cardinality cap: top 100 indexes, rest bucketed) ──\n601\t let (\n602\t ttl_documents_expired_total,\n603\t ttl_sweep_duration_seconds,\n604\t ttl_pending_estimate,\n605\t ) = if config.ttl.enabled {\n606\t let e = CounterVec::new(\n607\t Opts::new(\"miroir_ttl_documents_expired_total\", \"Documents expired by TTL sweeper\"),\n608\t &[\"index\"],\n609\t ).expect(\"create ttl_documents_expired_total\");\n610\t let d = HistogramVec::new(\n611\t HistogramOpts::new(\"miroir_ttl_sweep_duration_seconds\", \"Duration of TTL sweep cycles\")\n612\t .buckets(vec![0.01, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0, 10.0]),\n613\t &[\"index\"],\n614\t ).expect(\"create ttl_sweep_duration_seconds\");\n615\t let p = GaugeVec::new(\n616\t Opts::new(\"miroir_ttl_pending_estimate\", \"Estimated documents pending TTL expiry\"),\n617\t &[\"index\"],\n618\t ).expect(\"create ttl_pending_estimate\");\n619\t reg!(e); reg!(d); reg!(p);\n620\t (Some(e), Some(d), Some(p))\n621\t } else {\n622\t (None, None, None)\n623\t };\n624\t\n625\t // ── §13.15 Tenant affinity metrics (cardinality cap: top 100 tenants, rest bucketed) ──\n626\t let (\n627\t tenant_queries_total,\n628\t tenant_pinned_groups,\n629\t tenant_fallback_total,\n630\t ) = if config.tenant_affinity.enabled {\n631\t let q = CounterVec::new(\n632\t Opts::new(\"miroir_tenant_queries_total\", \"Queries routed per tenant and group\"),\n633\t &[\"tenant\", \"group\"],\n634\t ).expect(\"create tenant_queries_total\");\n635\t let p = GaugeVec::new(\n636\t Opts::new(\"miroir_tenant_pinned_groups\", \"Current pinned group per tenant\"),\n637\t &[\"tenant\"],\n638\t ).expect(\"create tenant_pinned_groups\");\n639\t let f = CounterVec::new(\n640\t Opts::new(\"miroir_tenant_fallback_total\", \"Tenant affinity fallback invocations\"),\n641\t &[\"reason\"],\n642\t ).expect(\"create tenant_fallback_total\");\n643\t reg!(q); reg!(p); reg!(f);\n644\t (Some(q), Some(p), Some(f))\n645\t } else {\n646\t (None, None, None)\n647\t };\n648\t\n649\t // ── §13.16 Shadow traffic metrics ──\n650\t let (\n651\t shadow_diff_total,\n652\t shadow_kendall_tau,\n653\t shadow_latency_delta_seconds,\n654\t shadow_errors_total,\n655\t ) = if config.shadow.enabled {\n656\t let d = CounterVec::new(\n657\t Opts::new(\"miroir_shadow_diff_total\", \"Shadow comparison diffs by kind\"),\n658\t &[\"kind\"],\n659\t ).expect(\"create shadow_diff_total\");\n660\t let k = Gauge::with_opts(\n661\t Opts::new(\"miroir_shadow_kendall_tau\", \"Kendall tau rank correlation between shadow and primary\"),\n662\t ).expect(\"create shadow_kendall_tau\");\n663\t let l = Histogram::with_opts(\n664\t HistogramOpts::new(\"miroir_shadow_latency_delta_seconds\", \"Latency difference between shadow and primary\")\n665\t .buckets(vec![-1.0, -0.5, -0.1, -0.01, 0.0, 0.01, 0.1, 0.5, 1.0]),\n666\t ).expect(\"create shadow_latency_delta_seconds\");\n667\t let e = CounterVec::new(\n668\t Opts::new(\"miroir_shadow_errors_total\", \"Shadow pipeline errors\"),\n669\t &[\"target\", \"side\"],\n670\t ).expect(\"create shadow_errors_total\");\n671\t reg!(d); reg!(k); reg!(l); reg!(e);\n672\t (Some(d), Some(k), Some(l), Some(e))\n673\t } else {\n674\t (None, None, None, None)\n675\t };\n676\t\n677\t // ── §13.17 ILM metrics (cardinality cap: top 100 policies/aliases, rest bucketed) ──\n678\t let (\n679\t rollover_events_total,\n680\t rollover_active_indexes,\n681\t rollover_documents_expired_total,\n682\t rollover_last_action_seconds,\n683\t ) = if config.ilm.enabled {\n684\t let e = CounterVec::new(\n685\t Opts::new(\"miroir_rollover_events_total\", \"ILM rollover events\"),\n686\t &[\"policy\"],\n687\t ).expect(\"create rollover_events_total\");\n688\t let a = GaugeVec::new(\n689\t Opts::new(\"miroir_rollover_active_indexes\", \"Active write indexes per alias\"),\n690\t &[\"alias\"],\n691\t ).expect(\"create rollover_active_indexes\");\n692\t let d = CounterVec::new(\n693\t Opts::new(\"miroir_rollover_documents_expired_total\", \"Documents expired by ILM retention policies\"),\n694\t &[\"policy\"],\n695\t ).expect(\"create rollover_documents_expired_total\");\n696\t let l = GaugeVec::new(\n697\t Opts::new(\"miroir_rollover_last_action_seconds\", \"Seconds since last rollover action per policy\"),\n698\t &[\"policy\"],\n699\t ).expect(\"create rollover_last_action_seconds\");\n700\t reg!(e); reg!(a); reg!(d); reg!(l);\n701\t (Some(e), Some(a), Some(d), Some(l))\n702\t } else {\n703\t (None, None, None, None)\n704\t };\n705\t\n706\t // ── §13.18 Canary metrics (cardinality cap: top 100 canaries, rest bucketed) ──\n707\t let (\n708\t canary_runs_total,\n709\t canary_latency_ms,\n710\t canary_assertion_failures_total,\n711\t ) = if config.canary_runner.enabled {\n712\t let r = CounterVec::new(\n713\t Opts::new(\"miroir_canary_runs_total\", \"Canary run results\"),\n714\t &[\"canary\", \"result\"],\n715\t ).expect(\"create canary_runs_total\");\n716\t let l = HistogramVec::new(\n717\t HistogramOpts::new(\"miroir_canary_latency_ms\", \"Canary execution latency\")\n718\t .buckets(vec![1.0, 5.0, 10.0, 25.0, 50.0, 100.0, 250.0, 500.0, 1000.0]),\n719\t &[\"canary\"],\n720\t ).expect(\"create canary_latency_ms\");\n721\t let a = CounterVec::new(\n722\t Opts::new(\"miroir_canary_assertion_failures_total\", \"Canary assertion failures\"),\n723\t &[\"canary\", \"assertion_type\"],\n724\t ).expect(\"create canary_assertion_failures_total\");\n725\t reg!(r); reg!(l); reg!(a);\n726\t (Some(r), Some(l), Some(a))\n727\t } else {\n728\t (None, None, None)\n729\t };\n730\t\n731\t // ── §13.19 Admin UI metrics ──\n732\t let (\n733\t admin_ui_sessions_total,\n734\t admin_ui_action_total,\n735\t admin_ui_destructive_action_total,\n736\t ) = if config.admin_ui.enabled {\n737\t let s = Counter::with_opts(\n738\t Opts::new(\"miroir_admin_ui_sessions_total\", \"Admin UI sessions started\"),\n739\t ).expect(\"create admin_ui_sessions_total\");\n740\t let a = CounterVec::new(\n741\t Opts::new(\"miroir_admin_ui_action_total\", \"Admin UI actions by type\"),\n742\t &[\"action\"],\n743\t ).expect(\"create admin_ui_action_total\");\n744\t let d = CounterVec::new(\n745\t Opts::new(\"miroir_admin_ui_destructive_action_total\", \"Admin UI destructive actions (delete, drop, etc.)\"),\n746\t &[\"action\"],\n747\t ).expect(\"create admin_ui_destructive_action_total\");\n748\t reg!(s); reg!(a); reg!(d);\n749\t (Some(s), Some(a), Some(d))\n750\t } else {\n751\t (None, None, None)\n752\t };\n753\t\n754\t // ── §13.20 Explain metrics ──\n755\t let (\n756\t explain_requests_total,\n757\t explain_warnings_total,\n758\t explain_execute_total,\n759\t ) = if config.explain.enabled {\n760\t let r = Counter::with_opts(\n761\t Opts::new(\"miroir_explain_requests_total\", \"Explain API requests\"),\n762\t ).expect(\"create explain_requests_total\");\n763\t let w = CounterVec::new(\n764\t Opts::new(\"miroir_explain_warnings_total\", \"Explain warnings by type\"),\n765\t &[\"warning_type\"],\n766\t ).expect(\"create explain_warnings_total\");\n767\t let e = Counter::with_opts(\n768\t Opts::new(\"miroir_explain_execute_total\", \"Explain requests with execute=true\"),\n769\t ).expect(\"create explain_execute_total\");\n770\t reg!(r); reg!(w); reg!(e);\n771\t (Some(r), Some(w), Some(e))\n772\t } else {\n773\t (None, None, None)\n774\t };\n775\t\n776\t // ── §13.21 Search UI metrics (cardinality cap: top 100 indexes, rest bucketed) ──\n777\t let (\n778\t search_ui_sessions_total,\n779\t search_ui_queries_total,\n780\t search_ui_zero_hits_total,\n781\t search_ui_click_through_total,\n782\t search_ui_p95_ms,\n783\t ) = if config.search_ui.enabled {\n784\t let s = Counter::with_opts(\n785\t Opts::new(\"miroir_search_ui_sessions_total\", \"Search UI sessions\"),\n786\t ).expect(\"create search_ui_sessions_total\");\n787\t let q = CounterVec::new(\n788\t Opts::new(\"miroir_search_ui_queries_total\", \"Search UI queries per index\"),\n789\t &[\"index\"],\n790\t ).expect(\"create search_ui_queries_total\");\n791\t let z = CounterVec::new(\n792\t Opts::new(\"miroir_search_ui_zero_hits_total\", \"Search UI zero-hit queries per index\"),\n793\t &[\"index\"],\n794\t ).expect(\"create search_ui_zero_hits_total\");\n795\t let c = CounterVec::new(\n796\t Opts::new(\"miroir_search_ui_click_through_total\", \"Search UI click-through events per index\"),\n797\t &[\"index\"],\n798\t ).expect(\"create search_ui_click_through_total\");\n799\t let p = GaugeVec::new(\n800\t Opts::new(\"miroir_search_ui_p95_ms\", \"Search UI p95 query latency per index\"),\n801\t &[\"index\"],\n802\t ).expect(\"create search_ui_p95_ms\");\n803\t reg!(s); reg!(q); reg!(z); reg!(c); reg!(p);\n804\t (Some(s), Some(q), Some(z), Some(c), Some(p))\n805\t } else {\n806\t (None, None, None, None, None)\n807\t };\n808\t\n809\t // ── §14.9 Resource-pressure metrics (always present) ──\n810\t let memory_pressure = Gauge::with_opts(\n811\t Opts::new(\"miroir_memory_pressure\", \"Memory pressure level (0=none, 1=low, 2=moderate/high)\")\n812\t ).expect(\"create memory_pressure\");\n813\t let cpu_throttled_seconds_total = Counter::with_opts(\n814\t Opts::new(\"miroir_cpu_throttled_seconds_total\", \"Total seconds of CPU throttling\")\n815\t ).expect(\"create cpu_throttled_seconds_total\");\n816\t let request_queue_depth = Gauge::with_opts(\n817\t Opts::new(\"miroir_request_queue_depth\", \"Number of requests queued waiting for processing\")\n818\t ).expect(\"create request_queue_depth\");\n819\t let background_queue_depth = GaugeVec::new(\n820\t Opts::new(\"miroir_background_queue_depth\", \"Number of background jobs queued by type\"),\n821\t &[\"job_type\"],\n822\t ).expect(\"create background_queue_depth\");\n823\t let peer_pod_count = Gauge::with_opts(\n824\t Opts::new(\"miroir_peer_pod_count\", \"Number of peer miroir pods discovered\")\n825\t ).expect(\"create peer_pod_count\");\n826\t let leader = Gauge::with_opts(\n827\t Opts::new(\"miroir_leader\", \"Whether this pod holds the leader lease (1=yes, 0=no)\")\n828\t ).expect(\"create leader\");\n829\t let owned_shards_count = Gauge::with_opts(\n830\t Opts::new(\"miroir_owned_shards_count\", \"Number of shards owned by this pod\")\n831\t ).expect(\"create owned_shards_count\");\n832\t reg!(memory_pressure);\n833\t reg!(cpu_throttled_seconds_total);\n834\t reg!(request_queue_depth);\n835\t reg!(background_queue_depth);\n836\t reg!(peer_pod_count);\n837\t reg!(leader);\n838\t reg!(owned_shards_count);\n839\t\n840\t // ── Admin session sealing metrics (always present) ──\n841\t let admin_session_key_generated = Gauge::with_opts(\n842\t Opts::new(\"miroir_admin_session_key_generated\",\n843\t \"Whether ADMIN_SESSION_SEAL_KEY was generated at startup (1=yes, 0=set via env)\")\n844\t ).expect(\"create admin_session_key_generated\");\n845\t let admin_session_revoked_total = Counter::with_opts(\n846\t Opts::new(\"miroir_admin_session_revoked_total\",\n847\t \"Admin sessions revoked via logout\")\n848\t ).expect(\"create admin_session_revoked_total\");\n849\t reg!(admin_session_key_generated);\n850\t reg!(admin_session_revoked_total);\n851\t\n852\t // ── §13.5 Two-phase settings broadcast metrics (always present) ──\n853\t let settings_broadcast_phase = GaugeVec::new(\n854\t Opts::new(\"miroir_settings_broadcast_phase\", \"Current phase of settings broadcast (0=idle, 1=propose, 2=verify, 3=commit)\"),\n855\t &[\"index\"],\n856\t ).expect(\"create settings_broadcast_phase\");\n857\t let settings_hash_mismatch_total = Counter::with_opts(\n858\t Opts::new(\"miroir_settings_hash_mismatch_total\", \"Settings hash mismatches detected during verify phase\"),\n859\t ).expect(\"create settings_hash_mismatch_total\");\n860\t let settings_drift_repair_total = CounterVec::new(\n861\t Opts::new(\"miroir_settings_drift_repair_total\", \"Settings drift repairs performed by drift reconciler\"),\n862\t &[\"index\"],\n863\t ).expect(\"create settings_drift_repair_total\");\n864\t let settings_version = GaugeVec::new(\n865\t Opts::new(\"miroir_settings_version\", \"Current settings version per index\"),\n866\t &[\"index\"],\n867\t ).expect(\"create settings_version\");\n868\t reg!(settings_broadcast_phase);\n869\t reg!(settings_hash_mismatch_total);\n870\t reg!(settings_drift_repair_total);\n871\t reg!(settings_version);\n872\t\n873\t // ── §13.7 Alias metrics (always present) ──\n874\t let alias_resolutions_total = CounterVec::new(\n875\t Opts::new(\"miroir_alias_resolutions_total\", \"Number of alias resolutions\"),\n876\t &[\"alias\"],\n877\t ).expect(\"create alias_resolutions_total\");\n878\t let alias_flips_total = CounterVec::new(\n879\t Opts::new(\"miroir_alias_flips_total\", \"Number of alias flips\"),\n880\t &[\"alias\"],\n881\t ).expect(\"create alias_flips_total\");\n882\t reg!(alias_resolutions_total);\n883\t reg!(alias_flips_total);\n884\t\n885\t // ── §13.6 Session pinning metrics (always present) ──\n886\t let session_active_count = Gauge::new(\n887\t \"miroir_session_active_count\",\n888\t \"Number of active sessions\",\n889\t ).expect(\"create session_active_count\");\n890\t let session_pin_enforced_total = CounterVec::new(\n891\t Opts::new(\"miroir_session_pin_enforced_total\", \"Number of times session pin was enforced\"),\n892\t &[\"strategy\"],\n893\t ).expect(\"create session_pin_enforced_total\");\n894\t let session_wait_duration_seconds = Histogram::with_opts(\n895\t HistogramOpts::new(\n896\t \"miroir_session_wait_duration_seconds\",\n897\t \"Duration of session pin wait operations\",\n898\t )\n899\t .buckets(vec![0.001, 0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0]),\n900\t ).expect(\"create session_wait_duration_seconds\");\n901\t let session_wait_timeout_total = CounterVec::new(\n902\t Opts::new(\"miroir_session_wait_timeout_total\", \"Number of session pin wait timeouts\"),\n903\t &[\"strategy\"],\n904\t ).expect(\"create session_wait_timeout_total\");\n905\t reg!(session_active_count);\n906\t reg!(session_pin_enforced_total);\n907\t reg!(session_wait_duration_seconds);\n908\t reg!(session_wait_timeout_total);\n909\t\n910\t Self {\n911\t registry,\n912\t request_duration,\n913\t requests_total,\n914\t requests_in_flight,\n915\t node_healthy,\n916\t node_request_duration,\n917\t node_errors,\n918\t shard_coverage,\n919\t degraded_shards,\n920\t shard_distribution,\n921\t task_processing_age,\n922\t tasks_total,\n923\t task_registry_size,\n924\t scatter_fan_out_size,\n925\t scatter_partial_responses,\n926\t scatter_retries,\n927\t rebalance_in_progress,\n928\t rebalance_documents_migrated,\n929\t rebalance_duration,\n930\t multisearch_queries_per_batch,\n931\t multisearch_batches_total,\n932\t multisearch_partial_failures_total,\n933\t multisearch_tenant_session_pin_override_total,\n934\t vector_search_over_fetched_total,\n935\t vector_merge_strategy,\n936\t vector_embedder_drift_total,\n937\t cdc_events_published_total,\n938\t cdc_lag_seconds,\n939\t cdc_buffer_bytes,\n940\t cdc_dropped_total,\n941\t cdc_events_suppressed_total,\n942\t ttl_documents_expired_total,\n943\t ttl_sweep_duration_seconds,\n944\t ttl_pending_estimate,\n945\t tenant_queries_total,\n946\t tenant_pinned_groups,\n947\t tenant_fallback_total,\n948\t shadow_diff_total,\n949\t shadow_kendall_tau,\n950\t shadow_latency_delta_seconds,\n951\t shadow_errors_total,\n952\t rollover_events_total,\n953\t rollover_active_indexes,\n954\t rollover_documents_expired_total,\n955\t rollover_last_action_seconds,\n956\t canary_runs_total,\n957\t canary_latency_ms,\n958\t canary_assertion_failures_total,\n959\t admin_ui_sessions_total,\n960\t admin_ui_action_total,\n961\t admin_ui_destructive_action_total,\n962\t explain_requests_total,\n963\t explain_warnings_total,\n964\t explain_execute_total,\n965\t search_ui_sessions_total,\n966\t search_ui_queries_total,\n967\t search_ui_zero_hits_total,\n968\t search_ui_click_through_total,\n969\t search_ui_p95_ms,\n970\t memory_pressure,\n971\t cpu_throttled_seconds_total,\n972\t request_queue_depth,\n973\t background_queue_depth,\n974\t peer_pod_count,\n975\t leader,\n976\t owned_shards_count,\n977\t admin_session_key_generated,\n978\t admin_session_revoked_total,\n979\t settings_broadcast_phase,\n980\t settings_hash_mismatch_total,\n981\t settings_drift_repair_total,\n982\t settings_version,\n983\t alias_resolutions_total,\n984\t alias_flips_total,\n985\t session_active_count,\n986\t session_pin_enforced_total,\n987\t session_wait_duration_seconds,\n988\t session_wait_timeout_total,\n989\t }\n990\t }\n991\t\n992\t pub fn encode_metrics(&self) -> Result {\n993\t let encoder = TextEncoder::new();\n994\t let metric_families = self.registry.gather();\n995\t let mut buffer = Vec::new();\n996\t encoder.encode(&metric_families, &mut buffer)?;\n997\t Ok(String::from_utf8(buffer).map_err(|e| {\n998\t prometheus::Error::Msg(format!(\"failed to convert metrics to UTF-8: {}\", e))\n999\t })?)\n1000\t }\n1001\t\n1002\t pub fn admin_session_key_generated(&self) -> Gauge {\n1003\t self.admin_session_key_generated.clone()\n1004\t }\n1005\t\n1006\t pub fn admin_session_revoked_total(&self) -> Counter {\n1007\t self.admin_session_revoked_total.clone()\n1008\t }\n1009\t}\n1010\t\n1011\t/// Generate a short request ID from UUIDv7.\n1012\t///\n1013\t/// UUIDv7 provides time-ordered unique IDs. We take the first 8 hex characters,\n1014\t/// hash them, and encode as hex for a short, URL-safe identifier.\n1015\tpub fn generate_request_id() -> String {\n1016\t let uuid = Uuid::now_v7();\n1017\t let uuid_str = uuid.simple().to_string();\n1018\t // Take first 8 chars (enough entropy for uniqueness)\n1019\t let prefix = &uuid_str[..8];\n1020\t\n1021\t // Hash to get a consistent short representation\n1022\t let mut hasher = DefaultHasher::new();\n1023\t prefix.hash(&mut hasher);\n1024\t let hash = hasher.finish();\n1025\t\n1026\t // Encode as hex (16 chars = 64 bits)\n1027\t format!(\"{:016x}\", hash)\n1028\t}\n1029\t\n1030\t/// Extension trait to add request ID extraction utilities.\n1031\tpub trait RequestIdExt {\n1032\t fn get_request_id(&self) -> Option;\n1033\t fn set_request_id(&mut self, id: &str);\n1034\t}\n1035\t\n1036\timpl RequestIdExt for HeaderMap {\n1037\t fn get_request_id(&self) -> Option {\n1038\t self.get(\"x-request-id\")\n1039\t .and_then(|v| v.to_str().ok())\n1040\t .map(|s| s.to_string())\n1041\t }\n1042\t\n1043\t fn set_request_id(&mut self, id: &str) {\n1044\t if let Ok(val) = HeaderValue::from_str(id) {\n1045\t self.insert(\"x-request-id\", val);\n1046\t }\n1047\t }\n1048\t}\n1049\t\n1050\t/// Guard that decrements the in-flight gauge when dropped.\n1051\t///\n1052\t/// This ensures that even if the handler panics, the in-flight count\n1053\t/// is accurately decremented.\n1054\tstruct InFlightGuard {\n1055\t metrics: Metrics,\n1056\t request_id: String,\n1057\t}\n1058\t\n1059\timpl InFlightGuard {\n1060\t fn new(metrics: Metrics, request_id: String) -> Self {\n1061\t metrics.requests_in_flight.inc();\n1062\t tracing::trace!(\n1063\t request_id = %request_id,\n1064\t requests_in_flight = metrics.requests_in_flight.get(),\n1065\t \"request started\"\n1066\t );\n1067\t Self { metrics, request_id }\n1068\t }\n1069\t}\n1070\t\n1071\timpl Drop for InFlightGuard {\n1072\t fn drop(&mut self) {\n1073\t self.metrics.requests_in_flight.dec();\n1074\t tracing::trace!(\n1075\t request_id = %self.request_id,\n1076\t requests_in_flight = self.metrics.requests_in_flight.get(),\n1077\t \"request completed\"\n1078\t );\n1079\t }\n1080\t}\n1081\t\n1082\t/// Extract the path template from the matched route.\n1083\t///\n1084\t/// Axum's MatchedPath extractor provides the route template (e.g., \"/indexes/{uid}/search\")\n1085\t/// instead of the actual path (e.g., \"/indexes/products/search\"), avoiding high-cardinality labels.\n1086\tfn extract_path_template(request: &Request) -> String {\n1087\t request\n1088\t .extensions()\n1089\t .get::()\n1090\t .map(|mp| mp.as_str())\n1091\t .unwrap_or_else(|| request.uri().path())\n1092\t .to_string()\n1093\t}\n1094\t\n1095\t/// Main middleware that combines request ID injection, structured logging, and Prometheus metrics.\n1096\t///\n1097\t/// IMPORTANT: This middleware must be applied AFTER request_id_middleware in the layer stack\n1098\t/// (i.e., its layer() call must come BEFORE request_id_middleware's layer() call).\n1099\t/// This ensures the request_id header is already set when this middleware runs.\n1100\tpub async fn telemetry_middleware(\n1101\t State(telemetry): State,\n1102\t mut req: Request,\n1103\t next: Next,\n1104\t) -> Response {\n1105\t let start = Instant::now();\n1106\t let method = req.method().clone();\n1107\t let path_template = extract_path_template(&req);\n1108\t let metrics = telemetry.metrics.clone();\n1109\t let pod_id = telemetry.pod_id.clone();\n1110\t\n1111\t // Extract request ID from header (set by request_id_middleware)\n1112\t // The header must already exist because request_id_middleware runs first.\n1113\t let request_id = req\n1114\t .headers()\n1115\t .get_request_id()\n1116\t .expect(\"request_id header must be set by request_id_middleware\");\n1117\t req.headers_mut().set_request_id(&request_id);\n1118\t\n1119\t // Create span for structured logging with pod_id included.\n1120\t // Note: raw path is intentionally omitted to avoid logging index names\n1121\t // (which may contain customer identifiers). Use path_template instead.\n1122\t let span = info_span!(\n1123\t \"request\",\n1124\t request_id = %request_id,\n1125\t pod_id = %pod_id,\n1126\t method = %method,\n1127\t path_template = %path_template,\n1128\t );\n1129\t\n1130\t let _guard = span.enter();\n1131\t\n1132\t // Track in-flight requests\n1133\t let in_flight = InFlightGuard::new(metrics.clone(), request_id.clone());\n1134\t\n1135\t let response = next.run(req).await;\n1136\t\n1137\t drop(in_flight);\n1138\t\n1139\t let status = response.status();\n1140\t let status_u16 = status.as_u16();\n1141\t let duration = start.elapsed();\n1142\t\n1143\t // Record Prometheus metrics\n1144\t metrics\n1145\t .request_duration\n1146\t .with_label_values(&[method.as_str(), &path_template, &status_u16.to_string()])\n1147\t .observe(duration.as_secs_f64());\n1148\t metrics\n1149\t .requests_total\n1150\t .with_label_values(&[method.as_str(), &path_template, &status_u16.to_string()])\n1151\t .inc();\n1152\t\n1153\t // Structured log entry (plan §10 shape)\n1154\t // Base fields: timestamp (from tracing-subscriber), level, message, duration_ms\n1155\t // Additional fields (index, node_count, estimated_hits, degraded)\n1156\t // are added by request handlers via the tracing span.\n1157\t let message = format!(\"{} {}\", method, status);\n1158\t if status.is_server_error() {\n1159\t tracing::error!(\n1160\t target: \"miroir.request\",\n1161\t pod_id = %pod_id,\n1162\t request_id = %request_id,\n1163\t message = %message,\n1164\t duration_ms = duration.as_millis() as u64,\n1165\t status = status_u16,\n1166\t method = %method,\n1167\t path_template = %path_template,\n1168\t );\n1169\t } else if status.is_client_error() {\n1170\t tracing::warn!(\n1171\t target: \"miroir.request\",\n1172\t pod_id = %pod_id,\n1173\t request_id = %request_id,\n1174\t message = %message,\n1175\t duration_ms = duration.as_millis() as u64,\n1176\t status = status_u16,\n1177\t method = %method,\n1178\t path_template = %path_template,\n1179\t );\n1180\t } else {\n1181\t tracing::info!(\n1182\t target: \"miroir.request\",\n1183\t pod_id = %pod_id,\n1184\t request_id = %request_id,\n1185\t message = %message,\n1186\t duration_ms = duration.as_millis() as u64,\n1187\t status = status_u16,\n1188\t method = %method,\n1189\t path_template = %path_template,\n1190\t );\n1191\t }\n1192\t\n1193\t // Ensure request ID is in response headers\n1194\t let mut response = response;\n1195\t if !response.headers().contains_key(\"x-request-id\") {\n1196\t if let Ok(val) = HeaderValue::from_str(&request_id) {\n1197\t response.headers_mut().insert(\"x-request-id\", val);\n1198\t }\n1199\t }\n1200\t\n1201\t response\n1202\t}\n1203\t\n1204\t/// Create the metrics router for the :9090 server.\n1205\tpub fn metrics_router() -> Router {\n1206\t Router::new().route(\"/metrics\", get(metrics_handler))\n1207\t}\n1208\t\n1209\t/// Handler that returns Prometheus metrics in text exposition format.\n1210\tasync fn metrics_handler(State(metrics): State) -> String {\n1211\t match metrics.encode_metrics() {\n1212\t Ok(metrics) => metrics,\n1213\t Err(e) => {\n1214\t tracing::error!(error = %e, \"failed to encode metrics\");\n1215\t format!(\"# ERROR: failed to encode metrics: {}\\n\", e)\n1216\t }\n1217\t }\n1218\t}\n1219\t\n1220\t/// Accessor methods for metrics that can be used by other parts of the application.\n1221\timpl Metrics {\n1222\t // ── Scatter-gather ──\n1223\t\n1224\t pub fn record_scatter_fan_out(&self, size: u64) {\n1225\t self.scatter_fan_out_size.observe(size as f64);\n1226\t }\n1227\t\n1228\t pub fn inc_scatter_partial_responses(&self) {\n1229\t self.scatter_partial_responses.inc();\n1230\t }\n1231\t\n1232\t pub fn inc_scatter_retries(&self) {\n1233\t self.scatter_retries.inc();\n1234\t }\n1235\t\n1236\t // ── Node health ──\n1237\t\n1238\t pub fn set_node_healthy(&self, node_id: &str, healthy: bool) {\n1239\t self.node_healthy.with_label_values(&[node_id]).set(if healthy { 1.0 } else { 0.0 });\n1240\t }\n1241\t\n1242\t pub fn record_node_request_duration(&self, node_id: &str, operation: &str, duration_secs: f64) {\n1243\t self.node_request_duration.with_label_values(&[node_id, operation]).observe(duration_secs);\n1244\t }\n1245\t\n1246\t pub fn inc_node_errors(&self, node_id: &str, error_type: &str) {\n1247\t self.node_errors.with_label_values(&[node_id, error_type]).inc();\n1248\t }\n1249\t\n1250\t // ── Shards ──\n1251\t\n1252\t pub fn set_shard_coverage(&self, coverage: f64) {\n1253\t self.shard_coverage.set(coverage);\n1254\t }\n1255\t\n1256\t pub fn set_degraded_shards(&self, count: f64) {\n1257\t self.degraded_shards.set(count);\n1258\t }\n1259\t\n1260\t pub fn set_shard_distribution(&self, node_id: &str, count: f64) {\n1261\t self.shard_distribution.with_label_values(&[node_id]).set(count);\n1262\t }\n1263\t\n1264\t // ── Tasks ──\n1265\t\n1266\t pub fn observe_task_processing_age(&self, age_secs: f64) {\n1267\t self.task_processing_age.observe(age_secs);\n1268\t }\n1269\t\n1270\t pub fn inc_tasks_total(&self, status: &str) {\n1271\t self.tasks_total.with_label_values(&[status]).inc();\n1272\t }\n1273\t\n1274\t pub fn set_task_registry_size(&self, size: f64) {\n1275\t self.task_registry_size.set(size);\n1276\t }\n1277\t\n1278\t // ── Rebalancer ──\n1279\t\n1280\t pub fn set_rebalance_in_progress(&self, v: bool) {\n1281\t self.rebalance_in_progress.set(if v { 1.0 } else { 0.0 });\n1282\t }\n1283\t\n1284\t pub fn inc_rebalance_documents_migrated(&self, count: u64) {\n1285\t self.rebalance_documents_migrated.inc_by(count as f64);\n1286\t }\n1287\t\n1288\t pub fn observe_rebalance_duration(&self, secs: f64) {\n1289\t self.rebalance_duration.observe(secs);\n1290\t }\n1291\t\n1292\t // ── §13.11 Multi-search ──\n1293\t\n1294\t pub fn observe_multisearch_queries_per_batch(&self, count: u64) {\n1295\t if let Some(ref m) = self.multisearch_queries_per_batch {\n1296\t m.observe(count as f64);\n1297\t }\n1298\t }\n1299\t\n1300\t pub fn inc_multisearch_batches_total(&self) {\n1301\t if let Some(ref m) = self.multisearch_batches_total {\n1302\t m.inc();\n1303\t }\n1304\t }\n1305\t\n1306\t pub fn inc_multisearch_partial_failures(&self) {\n1307\t if let Some(ref m) = self.multisearch_partial_failures_total {\n1308\t m.inc();\n1309\t }\n1310\t }\n1311\t\n1312\t pub fn inc_multisearch_tenant_session_pin_override(&self, tenant: &str) {\n1313\t if let Some(ref m) = self.multisearch_tenant_session_pin_override_total {\n1314\t m.with_label_values(&[tenant]).inc();\n1315\t }\n1316\t }\n1317\t\n1318\t // ── §13.12 Vector search ──\n1319\t\n1320\t pub fn inc_vector_search_over_fetched(&self) {\n1321\t if let Some(ref m) = self.vector_search_over_fetched_total {\n1322\t m.inc();\n1323\t }\n1324\t }\n1325\t\n1326\t pub fn inc_vector_merge_strategy(&self, strategy: &str) {\n1327\t if let Some(ref m) = self.vector_merge_strategy {\n1328\t m.with_label_values(&[strategy]).inc();\n1329\t }\n1330\t }\n1331\t\n1332\t pub fn inc_vector_embedder_drift(&self) {\n1333\t if let Some(ref m) = self.vector_embedder_drift_total {\n1334\t m.inc();\n1335\t }\n1336\t }\n1337\t\n1338\t // ── §13.13 CDC ──\n1339\t\n1340\t pub fn inc_cdc_events_published(&self, sink: &str, index: &str) {\n1341\t if let Some(ref m) = self.cdc_events_published_total {\n1342\t m.with_label_values(&[sink, index]).inc();\n1343\t }\n1344\t }\n1345\t\n1346\t pub fn set_cdc_lag_seconds(&self, sink: &str, lag: f64) {\n1347\t if let Some(ref m) = self.cdc_lag_seconds {\n1348\t m.with_label_values(&[sink]).set(lag);\n1349\t }\n1350\t }\n1351\t\n1352\t pub fn set_cdc_buffer_bytes(&self, sink: &str, bytes: f64) {\n1353\t if let Some(ref m) = self.cdc_buffer_bytes {\n1354\t m.with_label_values(&[sink]).set(bytes);\n1355\t }\n1356\t }\n1357\t\n1358\t pub fn inc_cdc_dropped(&self, sink: &str) {\n1359\t if let Some(ref m) = self.cdc_dropped_total {\n1360\t m.with_label_values(&[sink]).inc();\n1361\t }\n1362\t }\n1363\t\n1364\t pub fn inc_cdc_events_suppressed(&self, origin: &str) {\n1365\t if let Some(ref m) = self.cdc_events_suppressed_total {\n1366\t m.with_label_values(&[origin]).inc();\n1367\t }\n1368\t }\n1369\t\n1370\t // ── §13.14 TTL ──\n1371\t\n1372\t pub fn inc_ttl_documents_expired(&self, index: &str) {\n1373\t if let Some(ref m) = self.ttl_documents_expired_total {\n1374\t m.with_label_values(&[index]).inc();\n1375\t }\n1376\t }\n1377\t\n1378\t pub fn observe_ttl_sweep_duration(&self, index: &str, secs: f64) {\n1379\t if let Some(ref m) = self.ttl_sweep_duration_seconds {\n1380\t m.with_label_values(&[index]).observe(secs);\n1381\t }\n1382\t }\n1383\t\n1384\t pub fn set_ttl_pending_estimate(&self, index: &str, count: f64) {\n1385\t if let Some(ref m) = self.ttl_pending_estimate {\n1386\t m.with_label_values(&[index]).set(count);\n1387\t }\n1388\t }\n1389\t\n1390\t // ── §13.15 Tenant affinity ──\n1391\t\n1392\t pub fn inc_tenant_queries(&self, tenant: &str, group: &str) {\n1393\t if let Some(ref m) = self.tenant_queries_total {\n1394\t m.with_label_values(&[tenant, group]).inc();\n1395\t }\n1396\t }\n1397\t\n1398\t pub fn set_tenant_pinned_groups(&self, tenant: &str, group: u32) {\n1399\t if let Some(ref m) = self.tenant_pinned_groups {\n1400\t m.with_label_values(&[tenant]).set(group as f64);\n1401\t }\n1402\t }\n1403\t\n1404\t pub fn inc_tenant_fallback(&self, reason: &str) {\n1405\t if let Some(ref m) = self.tenant_fallback_total {\n1406\t m.with_label_values(&[reason]).inc();\n1407\t }\n1408\t }\n1409\t\n1410\t // ── §13.16 Shadow ──\n1411\t\n1412\t pub fn inc_shadow_diff(&self, kind: &str) {\n1413\t if let Some(ref m) = self.shadow_diff_total {\n1414\t m.with_label_values(&[kind]).inc();\n1415\t }\n1416\t }\n1417\t\n1418\t pub fn set_shadow_kendall_tau(&self, tau: f64) {\n1419\t if let Some(ref m) = self.shadow_kendall_tau {\n1420\t m.set(tau);\n1421\t }\n1422\t }\n1423\t\n1424\t pub fn observe_shadow_latency_delta(&self, delta: f64) {\n1425\t if let Some(ref m) = self.shadow_latency_delta_seconds {\n1426\t m.observe(delta);\n1427\t }\n1428\t }\n1429\t\n1430\t pub fn inc_shadow_errors(&self, target: &str, side: &str) {\n1431\t if let Some(ref m) = self.shadow_errors_total {\n1432\t m.with_label_values(&[target, side]).inc();\n1433\t }\n1434\t }\n1435\t\n1436\t // ── §13.17 ILM ──\n1437\t\n1438\t pub fn inc_rollover_events(&self, policy: &str) {\n1439\t if let Some(ref m) = self.rollover_events_total {\n1440\t m.with_label_values(&[policy]).inc();\n1441\t }\n1442\t }\n1443\t\n1444\t pub fn set_rollover_active_indexes(&self, alias: &str, count: f64) {\n1445\t if let Some(ref m) = self.rollover_active_indexes {\n1446\t m.with_label_values(&[alias]).set(count);\n1447\t }\n1448\t }\n1449\t\n1450\t pub fn inc_rollover_documents_expired(&self, policy: &str) {\n1451\t if let Some(ref m) = self.rollover_documents_expired_total {\n1452\t m.with_label_values(&[policy]).inc();\n1453\t }\n1454\t }\n1455\t\n1456\t pub fn set_rollover_last_action_seconds(&self, policy: &str, secs: f64) {\n1457\t if let Some(ref m) = self.rollover_last_action_seconds {\n1458\t m.with_label_values(&[policy]).set(secs);\n1459\t }\n1460\t }\n1461\t\n1462\t // ── §13.18 Canary ──\n1463\t\n1464\t pub fn inc_canary_runs(&self, canary: &str, result: &str) {\n1465\t if let Some(ref m) = self.canary_runs_total {\n1466\t m.with_label_values(&[canary, result]).inc();\n1467\t }\n1468\t }\n1469\t\n1470\t pub fn observe_canary_latency_ms(&self, canary: &str, ms: f64) {\n1471\t if let Some(ref m) = self.canary_latency_ms {\n1472\t m.with_label_values(&[canary]).observe(ms);\n1473\t }\n1474\t }\n1475\t\n1476\t pub fn inc_canary_assertion_failures(&self, canary: &str, assertion_type: &str) {\n1477\t if let Some(ref m) = self.canary_assertion_failures_total {\n1478\t m.with_label_values(&[canary, assertion_type]).inc();\n1479\t }\n1480\t }\n1481\t\n1482\t // ── §13.19 Admin UI ──\n1483\t\n1484\t pub fn inc_admin_ui_sessions(&self) {\n1485\t if let Some(ref m) = self.admin_ui_sessions_total {\n1486\t m.inc();\n1487\t }\n1488\t }\n1489\t\n1490\t pub fn inc_admin_ui_action(&self, action: &str) {\n1491\t if let Some(ref m) = self.admin_ui_action_total {\n1492\t m.with_label_values(&[action]).inc();\n1493\t }\n1494\t }\n1495\t\n1496\t pub fn inc_admin_ui_destructive_action(&self, action: &str) {\n1497\t if let Some(ref m) = self.admin_ui_destructive_action_total {\n1498\t m.with_label_values(&[action]).inc();\n1499\t }\n1500\t }\n1501\t\n1502\t // ── §13.20 Explain ──\n1503\t\n1504\t pub fn inc_explain_requests(&self) {\n1505\t if let Some(ref m) = self.explain_requests_total {\n1506\t m.inc();\n1507\t }\n1508\t }\n1509\t\n1510\t pub fn inc_explain_warnings(&self, warning_type: &str) {\n1511\t if let Some(ref m) = self.explain_warnings_total {\n1512\t m.with_label_values(&[warning_type]).inc();\n1513\t }\n1514\t }\n1515\t\n1516\t pub fn inc_explain_execute(&self) {\n1517\t if let Some(ref m) = self.explain_execute_total {\n1518\t m.inc();\n1519\t }\n1520\t }\n1521\t\n1522\t // ── §13.21 Search UI ──\n1523\t\n1524\t pub fn inc_search_ui_sessions(&self) {\n1525\t if let Some(ref m) = self.search_ui_sessions_total {\n1526\t m.inc();\n1527\t }\n1528\t }\n1529\t\n1530\t pub fn inc_search_ui_queries(&self, index: &str) {\n1531\t if let Some(ref m) = self.search_ui_queries_total {\n1532\t m.with_label_values(&[index]).inc();\n1533\t }\n1534\t }\n1535\t\n1536\t pub fn inc_search_ui_zero_hits(&self, index: &str) {\n1537\t if let Some(ref m) = self.search_ui_zero_hits_total {\n1538\t m.with_label_values(&[index]).inc();\n1539\t }\n1540\t }\n1541\t\n1542\t pub fn inc_search_ui_click_through(&self, index: &str) {\n1543\t if let Some(ref m) = self.search_ui_click_through_total {\n1544\t m.with_label_values(&[index]).inc();\n1545\t }\n1546\t }\n1547\t\n1548\t pub fn set_search_ui_p95_ms(&self, index: &str, ms: f64) {\n1549\t if let Some(ref m) = self.search_ui_p95_ms {\n1550\t m.with_label_values(&[index]).set(ms);\n1551\t }\n1552\t }\n1553\t\n1554\t // ── §14.9 Resource-pressure ──\n1555\t\n1556\t pub fn set_memory_pressure(&self, level: u32) {\n1557\t self.memory_pressure.set(level as f64);\n1558\t }\n1559\t\n1560\t pub fn inc_cpu_throttled_seconds(&self, secs: f64) {\n1561\t self.cpu_throttled_seconds_total.inc_by(secs);\n1562\t }\n1563\t\n1564\t pub fn set_request_queue_depth(&self, depth: u64) {\n1565\t self.request_queue_depth.set(depth as f64);\n1566\t }\n1567\t\n1568\t pub fn set_background_queue_depth(&self, job_type: &str, depth: u64) {\n1569\t self.background_queue_depth.with_label_values(&[job_type]).set(depth as f64);\n1570\t }\n1571\t\n1572\t pub fn set_peer_pod_count(&self, count: u64) {\n1573\t self.peer_pod_count.set(count as f64);\n1574\t }\n1575\t\n1576\t pub fn set_leader(&self, is_leader: bool) {\n1577\t self.leader.set(if is_leader { 1.0 } else { 0.0 });\n1578\t }\n1579\t\n1580\t pub fn set_owned_shards_count(&self, count: u64) {\n1581\t self.owned_shards_count.set(count as f64);\n1582\t }\n1583\t\n1584\t // ── §13.5 Two-phase settings broadcast metrics ──\n1585\t\n1586\t pub fn set_settings_broadcast_phase(&self, index: &str, phase: u8) {\n1587\t self.settings_broadcast_phase.with_label_values(&[index]).set(phase as f64);\n1588\t }\n1589\t\n1590\t pub fn clear_settings_broadcast_phase(&self, index: &str) {\n1591\t self.settings_broadcast_phase.with_label_values(&[index]).set(0.0);\n1592\t }\n1593\t\n1594\t pub fn inc_settings_hash_mismatch(&self) {\n1595\t self.settings_hash_mismatch_total.inc();\n1596\t }\n1597\t\n1598\t pub fn inc_settings_drift_repair(&self, index: &str) {\n1599\t self.settings_drift_repair_total.with_label_values(&[index]).inc();\n1600\t }\n1601\t\n1602\t pub fn set_settings_version(&self, index: &str, version: u64) {\n1603\t self.settings_version.with_label_values(&[index]).set(version as f64);\n1604\t }\n1605\t\n1606\t pub fn get_settings_version(&self, index: &str) -> f64 {\n1607\t self.settings_version.with_label_values(&[index]).get()\n1608\t }\n1609\t\n1610\t // ── §13.7 Alias metrics ──\n1611\t\n1612\t pub fn inc_alias_resolution(&self, alias: &str) {\n1613\t self.alias_resolutions_total.with_label_values(&[alias]).inc();\n1614\t }\n1615\t\n1616\t pub fn inc_alias_flip(&self, alias: &str) {\n1617\t self.alias_flips_total.with_label_values(&[alias]).inc();\n1618\t }\n1619\t\n1620\t // ── §13.6 Session pinning metrics ──\n1621\t\n1622\t pub fn set_session_active_count(&self, count: u64) {\n1623\t self.session_active_count.set(count as f64);\n1624\t }\n1625\t\n1626\t pub fn inc_session_pin_enforced(&self, strategy: &str) {\n1627\t self.session_pin_enforced_total.with_label_values(&[strategy]).inc();\n1628\t }\n1629\t\n1630\t pub fn observe_session_wait_duration(&self, duration_seconds: f64) {\n1631\t self.session_wait_duration_seconds.observe(duration_seconds);\n1632\t }\n1633\t\n1634\t pub fn inc_session_wait_timeout(&self, strategy: &str) {\n1635\t self.session_wait_timeout_total.with_label_values(&[strategy]).inc();\n1636\t }\n1637\t\n1638\t pub fn registry(&self) -> &Registry {\n1639\t &self.registry\n1640\t }\n1641\t}\n1642\t\n1643\t#[cfg(test)]\n1644\tmod tests {\n1645\t use super::*;\n1646\t\n1647\t #[test]\n1648\t fn test_request_id_generation() {\n1649\t // Generate multiple IDs to verify format\n1650\t for _ in 0..10 {\n1651\t let id = generate_request_id();\n1652\t\n1653\t // IDs should be 16 hex chars (64-bit hash)\n1654\t assert_eq!(id.len(), 16);\n1655\t\n1656\t // IDs should be hexadecimal\n1657\t assert!(id.chars().all(|c| c.is_ascii_hexdigit()));\n1658\t }\n1659\t\n1660\t // Test that different UUID prefixes produce different IDs\n1661\t let id1 = generate_request_id();\n1662\t std::thread::sleep(std::time::Duration::from_millis(5));\n1663\t let id2 = generate_request_id();\n1664\t // In production, time ensures uniqueness; test just verifies format above\n1665\t assert_eq!(id1.len(), 16);\n1666\t assert_eq!(id2.len(), 16);\n1667\t }\n1668\t\n1669\t #[test]\n1670\t fn test_metrics_creation() {\n1671\t // Default config has all §13 features enabled\n1672\t let metrics = Metrics::new(&MiroirConfig::default());\n1673\t\n1674\t // Add some sample data to ensure metrics show up in output\n1675\t metrics.request_duration.with_label_values(&[\"GET\", \"/test\", \"200\"]).observe(0.1);\n1676\t metrics.requests_total.with_label_values(&[\"GET\", \"/test\", \"200\"]).inc();\n1677\t metrics.requests_in_flight.inc();\n1678\t metrics.node_healthy.with_label_values(&[\"test-node\"]).set(1.0);\n1679\t metrics.node_request_duration.with_label_values(&[\"test-node\", \"search\"]).observe(0.05);\n1680\t metrics.node_errors.with_label_values(&[\"test-node\", \"timeout\"]).inc();\n1681\t metrics.shard_coverage.set(1.0);\n1682\t metrics.degraded_shards.set(0.0);\n1683\t metrics.shard_distribution.with_label_values(&[\"test-node\"]).set(32.0);\n1684\t metrics.task_processing_age.observe(0.1);\n1685\t metrics.tasks_total.with_label_values(&[\"completed\"]).inc();\n1686\t metrics.task_registry_size.set(5.0);\n1687\t metrics.scatter_fan_out_size.observe(3.0);\n1688\t metrics.scatter_partial_responses.inc();\n1689\t metrics.scatter_retries.inc();\n1690\t metrics.rebalance_in_progress.set(0.0);\n1691\t metrics.rebalance_documents_migrated.inc();\n1692\t metrics.rebalance_duration.observe(10.0);\n1693\t\n1694\t // Write to advanced Vec metrics so they appear in output\n1695\t metrics.inc_multisearch_tenant_session_pin_override(\"t1\");\n1696\t metrics.inc_vector_merge_strategy(\"convex\");\n1697\t metrics.inc_cdc_events_published(\"webhook\", \"idx1\");\n1698\t metrics.set_cdc_lag_seconds(\"webhook\", 0.5);\n1699\t metrics.set_cdc_buffer_bytes(\"webhook\", 1024.0);\n1700\t metrics.inc_cdc_dropped(\"webhook\");\n1701\t metrics.inc_cdc_events_suppressed(\"origin1\");\n1702\t metrics.inc_ttl_documents_expired(\"idx1\");\n1703\t metrics.observe_ttl_sweep_duration(\"idx1\", 0.1);\n1704\t metrics.set_ttl_pending_estimate(\"idx1\", 50.0);\n1705\t metrics.inc_tenant_queries(\"t1\", \"g1\");\n1706\t metrics.set_tenant_pinned_groups(\"t1\", 1);\n1707\t metrics.inc_tenant_fallback(\"no_group\");\n1708\t metrics.inc_shadow_diff(\"rank\");\n1709\t metrics.inc_shadow_errors(\"target1\", \"primary\");\n1710\t metrics.inc_rollover_events(\"policy1\");\n1711\t metrics.set_rollover_active_indexes(\"alias1\", 1.0);\n1712\t metrics.inc_rollover_documents_expired(\"policy1\");\n1713\t metrics.set_rollover_last_action_seconds(\"policy1\", 60.0);\n1714\t metrics.inc_canary_runs(\"canary1\", \"pass\");\n1715\t metrics.observe_canary_latency_ms(\"canary1\", 50.0);\n1716\t metrics.inc_canary_assertion_failures(\"canary1\", \"latency\");\n1717\t metrics.inc_admin_ui_action(\"login\");\n1718\t metrics.inc_admin_ui_destructive_action(\"delete_index\");\n1719\t metrics.inc_explain_warnings(\"slow_plan\");\n1720\t metrics.inc_search_ui_queries(\"idx1\");\n1721\t metrics.inc_search_ui_zero_hits(\"idx1\");\n1722\t metrics.inc_search_ui_click_through(\"idx1\");\n1723\t metrics.set_search_ui_p95_ms(\"idx1\", 150.0);\n1724\t\n1725\t // §14.9 Resource-pressure metrics\n1726\t metrics.set_memory_pressure(0);\n1727\t metrics.inc_cpu_throttled_seconds(1.5);\n1728\t metrics.set_request_queue_depth(42);\n1729\t metrics.set_background_queue_depth(\"rebalance\", 5);\n1730\t metrics.set_background_queue_depth(\"replication\", 3);\n1731\t metrics.set_peer_pod_count(3);\n1732\t metrics.set_leader(true);\n1733\t metrics.set_owned_shards_count(12);\n1734\t\n1735\t let encoded = metrics.encode_metrics();\n1736\t assert!(encoded.is_ok());\n1737\t\n1738\t let output = encoded.unwrap();\n1739\t\n1740\t // Verify all 18 core plan §10 metric names appear in the output\n1741\t let expected_metrics = [\n1742\t // Request metrics\n1743\t \"miroir_request_duration_seconds\",\n1744\t \"miroir_requests_total\",\n1745\t \"miroir_requests_in_flight\",\n1746\t // Node health metrics\n1747\t \"miroir_node_healthy\",\n1748\t \"miroir_node_request_duration_seconds\",\n1749\t \"miroir_node_errors_total\",\n1750\t // Shard metrics\n1751\t \"miroir_shard_coverage\",\n1752\t \"miroir_degraded_shards_total\",\n1753\t \"miroir_shard_distribution\",\n1754\t // Task metrics\n1755\t \"miroir_task_processing_age_seconds\",\n1756\t \"miroir_tasks_total\",\n1757\t \"miroir_task_registry_size\",\n1758\t // Scatter-gather metrics\n1759\t \"miroir_scatter_fan_out_size\",\n1760\t \"miroir_scatter_partial_responses_total\",\n1761\t \"miroir_scatter_retries_total\",\n1762\t // Rebalancer metrics\n1763\t \"miroir_rebalance_in_progress\",\n1764\t \"miroir_rebalance_documents_migrated_total\",\n1765\t \"miroir_rebalance_duration_seconds\",\n1766\t ];\n1767\t for name in &expected_metrics {\n1768\t assert!(output.contains(name), \"missing metric: {}\", name);\n1769\t }\n1770\t\n1771\t // With defaults (all §13 enabled), advanced metrics should be present\n1772\t let advanced_metrics = [\n1773\t // §13.11 Multi-search\n1774\t \"miroir_multisearch_queries_per_batch\",\n1775\t \"miroir_multisearch_batches_total\",\n1776\t \"miroir_multisearch_partial_failures_total\",\n1777\t \"miroir_tenant_session_pin_override_total\",\n1778\t // §13.12 Vector\n1779\t \"miroir_vector_search_over_fetched_total\",\n1780\t \"miroir_vector_merge_strategy\",\n1781\t \"miroir_vector_embedder_drift_total\",\n1782\t // §13.13 CDC\n1783\t \"miroir_cdc_events_published_total\",\n1784\t \"miroir_cdc_lag_seconds\",\n1785\t \"miroir_cdc_buffer_bytes\",\n1786\t \"miroir_cdc_dropped_total\",\n1787\t \"miroir_cdc_events_suppressed_total\",\n1788\t // §13.14 TTL\n1789\t \"miroir_ttl_documents_expired_total\",\n1790\t \"miroir_ttl_sweep_duration_seconds\",\n1791\t \"miroir_ttl_pending_estimate\",\n1792\t // §13.15 Tenant\n1793\t \"miroir_tenant_queries_total\",\n1794\t \"miroir_tenant_pinned_groups\",\n1795\t \"miroir_tenant_fallback_total\",\n1796\t // §13.16 Shadow\n1797\t \"miroir_shadow_diff_total\",\n1798\t \"miroir_shadow_kendall_tau\",\n1799\t \"miroir_shadow_latency_delta_seconds\",\n1800\t \"miroir_shadow_errors_total\",\n1801\t // §13.17 ILM\n1802\t \"miroir_rollover_events_total\",\n1803\t \"miroir_rollover_active_indexes\",\n1804\t \"miroir_rollover_documents_expired_total\",\n1805\t \"miroir_rollover_last_action_seconds\",\n1806\t // §13.18 Canary\n1807\t \"miroir_canary_runs_total\",\n1808\t \"miroir_canary_latency_ms\",\n1809\t \"miroir_canary_assertion_failures_total\",\n1810\t // §13.19 Admin UI\n1811\t \"miroir_admin_ui_sessions_total\",\n1812\t \"miroir_admin_ui_action_total\",\n1813\t \"miroir_admin_ui_destructive_action_total\",\n1814\t // §13.20 Explain\n1815\t \"miroir_explain_requests_total\",\n1816\t \"miroir_explain_warnings_total\",\n1817\t \"miroir_explain_execute_total\",\n1818\t // §13.21 Search UI\n1819\t \"miroir_search_ui_sessions_total\",\n1820\t \"miroir_search_ui_queries_total\",\n1821\t \"miroir_search_ui_zero_hits_total\",\n1822\t \"miroir_search_ui_click_through_total\",\n1823\t \"miroir_search_ui_p95_ms\",\n1824\t ];\n1825\t for name in &advanced_metrics {\n1826\t assert!(output.contains(name), \"missing advanced metric: {}\", name);\n1827\t }\n1828\t }\n1829\t\n1830\t #[test]\n1831\t fn test_metrics_feature_flags_off() {\n1832\t // Build a config with all §13.11-13.21 features disabled\n1833\t let mut config = MiroirConfig::default();\n1834\t config.multi_search.enabled = false;\n1835\t config.vector_search.enabled = false;\n1836\t config.cdc.enabled = false;\n1837\t config.ttl.enabled = false;\n1838\t config.tenant_affinity.enabled = false;\n1839\t config.shadow.enabled = false;\n1840\t config.ilm.enabled = false;\n1841\t config.canary_runner.enabled = false;\n1842\t config.admin_ui.enabled = false;\n1843\t config.explain.enabled = false;\n1844\t config.search_ui.enabled = false;\n1845\t\n1846\t let metrics = Metrics::new(&config);\n1847\t\n1848\t // Write to core Vec metrics so they appear in output\n1849\t metrics.request_duration.with_label_values(&[\"GET\", \"/test\", \"200\"]).observe(0.1);\n1850\t\n1851\t let encoded = metrics.encode_metrics().unwrap();\n1852\t\n1853\t // Core metrics should still be present\n1854\t assert!(encoded.contains(\"miroir_request_duration_seconds\"));\n1855\t assert!(encoded.contains(\"miroir_rebalance_duration_seconds\"));\n1856\t\n1857\t // Advanced metrics should NOT appear\n1858\t let advanced_names = [\n1859\t \"miroir_multisearch_queries_per_batch\",\n1860\t \"miroir_vector_search_over_fetched_total\",\n1861\t \"miroir_cdc_events_published_total\",\n1862\t \"miroir_ttl_documents_expired_total\",\n1863\t \"miroir_tenant_queries_total\",\n1864\t \"miroir_shadow_diff_total\",\n1865\t \"miroir_rollover_events_total\",\n1866\t \"miroir_canary_runs_total\",\n1867\t \"miroir_admin_ui_sessions_total\",\n1868\t \"miroir_explain_requests_total\",\n1869\t \"miroir_search_ui_sessions_total\",\n1870\t ];\n1871\t for name in &advanced_names {\n1872\t assert!(!encoded.contains(name), \"advanced metric should not appear when disabled: {}\", name);\n1873\t }\n1874\t }\n1875\t\n1876\t #[test]\n1877\t fn test_feature_gated_accessors_noop_when_disabled() {\n1878\t let mut config = MiroirConfig::default();\n1879\t config.multi_search.enabled = false;\n1880\t config.vector_search.enabled = false;\n1881\t config.cdc.enabled = false;\n1882\t config.ttl.enabled = false;\n1883\t config.tenant_affinity.enabled = false;\n1884\t config.shadow.enabled = false;\n1885\t config.ilm.enabled = false;\n1886\t config.canary_runner.enabled = false;\n1887\t config.admin_ui.enabled = false;\n1888\t config.explain.enabled = false;\n1889\t config.search_ui.enabled = false;\n1890\t\n1891\t let metrics = Metrics::new(&config);\n1892\t\n1893\t // All accessor methods should be safe to call (no-op)\n1894\t metrics.observe_multisearch_queries_per_batch(5);\n1895\t metrics.inc_multisearch_batches_total();\n1896\t metrics.inc_multisearch_partial_failures();\n1897\t metrics.inc_multisearch_tenant_session_pin_override(\"t1\");\n1898\t metrics.inc_vector_search_over_fetched();\n1899\t metrics.inc_vector_merge_strategy(\"convex\");\n1900\t metrics.inc_vector_embedder_drift();\n1901\t metrics.inc_cdc_events_published(\"webhook\", \"idx\");\n1902\t metrics.set_cdc_lag_seconds(\"webhook\", 1.5);\n1903\t metrics.set_cdc_buffer_bytes(\"webhook\", 1024.0);\n1904\t metrics.inc_cdc_dropped(\"webhook\");\n1905\t metrics.inc_cdc_events_suppressed(\"origin1\");\n1906\t metrics.inc_ttl_documents_expired(\"idx\");\n1907\t metrics.observe_ttl_sweep_duration(\"idx\", 0.1);\n1908\t metrics.set_ttl_pending_estimate(\"idx\", 50.0);\n1909\t metrics.inc_tenant_queries(\"t1\", \"0\");\n1910\t metrics.set_tenant_pinned_groups(\"t1\", 1);\n1911\t metrics.inc_tenant_fallback(\"no_group\");\n1912\t metrics.inc_shadow_diff(\"rank\");\n1913\t metrics.set_shadow_kendall_tau(0.95);\n1914\t metrics.observe_shadow_latency_delta(0.01);\n1915\t metrics.inc_shadow_errors(\"target1\", \"primary\");\n1916\t metrics.inc_rollover_events(\"policy1\");\n1917\t metrics.set_rollover_active_indexes(\"alias1\", 1.0);\n1918\t metrics.inc_rollover_documents_expired(\"policy1\");\n1919\t metrics.set_rollover_last_action_seconds(\"policy1\", 60.0);\n1920\t metrics.inc_canary_runs(\"canary1\", \"pass\");\n1921\t metrics.observe_canary_latency_ms(\"canary1\", 50.0);\n1922\t metrics.inc_canary_assertion_failures(\"canary1\", \"latency\");\n1923\t metrics.inc_admin_ui_sessions();\n1924\t metrics.inc_admin_ui_action(\"login\");\n1925\t metrics.inc_admin_ui_destructive_action(\"delete_index\");\n1926\t metrics.inc_explain_requests();\n1927\t metrics.inc_explain_warnings(\"slow_plan\");\n1928\t metrics.inc_explain_execute();\n1929\t metrics.inc_search_ui_sessions();\n1930\t metrics.inc_search_ui_queries(\"idx\");\n1931\t metrics.inc_search_ui_zero_hits(\"idx\");\n1932\t metrics.inc_search_ui_click_through(\"idx\");\n1933\t metrics.set_search_ui_p95_ms(\"idx\", 150.0);\n1934\t }\n1935\t\n1936\t #[test]\n1937\t fn test_header_request_id() {\n1938\t let mut headers = HeaderMap::new();\n1939\t assert!(headers.get_request_id().is_none());\n1940\t\n1941\t headers.set_request_id(\"test-id-123\");\n1942\t assert_eq!(headers.get_request_id(), Some(\"test-id-123\".to_string()));\n1943\t }\n1944\t\n1945\t // ---------------------------------------------------------------------------\n1946\t // RequestId type tests\n1947\t // ---------------------------------------------------------------------------\n1948\t\n1949\t #[test]\n1950\t fn test_request_id_format() {\n1951\t let id = RequestId::new();\n1952\t // RequestId should be exactly 8 hex characters\n1953\t assert_eq!(id.as_str().len(), 8);\n1954\t assert!(id.as_str().chars().all(|c| c.is_ascii_hexdigit()));\n1955\t }\n1956\t\n1957\t #[test]\n1958\t fn test_request_id_parse_valid() {\n1959\t // Valid 8-char hex string\n1960\t let valid = \"abcd1234\";\n1961\t let parsed = RequestId::parse(valid.to_string());\n1962\t assert!(parsed.is_some());\n1963\t assert_eq!(parsed.unwrap().as_str(), valid);\n1964\t }\n1965\t\n1966\t #[test]\n1967\t fn test_request_id_parse_invalid_wrong_length() {\n1968\t // Wrong length (too short)\n1969\t assert!(RequestId::parse(\"abc123\".to_string()).is_none());\n1970\t // Wrong length (too long)\n1971\t assert!(RequestId::parse(\"abcd12345678\".to_string()).is_none());\n1972\t }\n1973\t\n1974\t #[test]\n1975\t fn test_request_id_parse_invalid_non_hex() {\n1976\t // Contains non-hex characters\n1977\t assert!(RequestId::parse(\"abcd1234!\".to_string()).is_none());\n1978\t assert!(RequestId::parse(\"ghijklmn\".to_string()).is_none());\n1979\t }\n1980\t\n1981\t #[test]\n1982\t fn test_request_id_uniqueness() {\n1983\t // Generate two consecutive IDs - they should be different\n1984\t // due to UUIDv7's timestamp component\n1985\t let id1 = RequestId::new();\n1986\t std::thread::sleep(std::time::Duration::from_millis(5));\n1987\t let id2 = RequestId::new();\n1988\t\n1989\t assert_ne!(id1, id2);\n1990\t assert_ne!(id1.as_str(), id2.as_str());\n1991\t }\n1992\t\n1993\t // ---------------------------------------------------------------------------\n1994\t // Integration tests for request_id_middleware\n1995\t // ---------------------------------------------------------------------------\n1996\t\n1997\t #[tokio::test]\n1998\t async fn test_request_id_middleware_adds_header() {\n1999\t use axum::{routing::get, Router};\n2000\t use http_body_util::Full;\n2001\t use tower::ServiceExt;\n2002\t\n2003\t // Build a simple router with the request ID middleware\n2004\t let app = Router::new()\n2005\t .route(\"/test\", get(|| async { \"OK\" }))\n2006\t .layer(axum::middleware::from_fn(request_id_middleware));\n2007\t\n2008\t // Create a test request\n2009\t let request = Request::builder()\n2010\t .uri(\"/test\")\n2011\t .body(Full::default())\n2012\t .unwrap();\n2013\t\n2014\t // Send the request\n2015\t let response = app.oneshot(request).await.unwrap();\n2016\t\n2017\t // Verify X-Request-Id header is present\n2018\t let header = response\n2019\t .headers()\n2020\t .get(\"x-request-id\")\n2021\t .expect(\"X-Request-Id header should be present\");\n2022\t let header_value = header.to_str().unwrap();\n2023\t\n2024\t // Verify it's 8 hex characters\n2025\t assert_eq!(\n2026\t header_value.len(),\n2027\t 8,\n2028\t \"X-Request-Id should be 8 characters\"\n2029\t );\n2030\t assert!(\n2031\t header_value.chars().all(|c| c.is_ascii_hexdigit()),\n2032\t \"X-Request-Id should be hexadecimal\"\n2033\t );\n2034\t }\n2035\t\n2036\t #[tokio::test]\n2037\t async fn test_request_id_middleware_unique_per_request() {\n2038\t use axum::{routing::get, Router};\n2039\t use http_body_util::Full;\n2040\t use tower::ServiceExt;\n2041\t\n2042\t // Build a simple router with the request ID middleware\n2043\t let app = Router::new()\n2044\t .route(\"/test\", get(|| async { \"OK\" }))\n2045\t .layer(axum::middleware::from_fn(request_id_middleware));\n2046\t\n2047\t // Create two identical requests\n2048\t let request1 = Request::builder()\n2049\t .uri(\"/test\")\n2050\t .body(Full::default())\n2051\t .unwrap();\n2052\t\n2053\t let request2 = Request::builder()\n2054\t .uri(\"/test\")\n2055\t .body(Full::default())\n2056\t .unwrap();\n2057\t\n2058\t // Send both requests\n2059\t let response1 = app.clone().oneshot(request1).await.unwrap();\n2060\t let response2 = app.oneshot(request2).await.unwrap();\n2061\t\n2062\t // Extract headers\n2063\t let id1 = response1\n2064\t .headers()\n2065\t .get(\"x-request-id\")\n2066\t .unwrap()\n2067\t .to_str()\n2068\t .unwrap();\n2069\t let id2 = response2\n2070\t .headers()\n2071\t .get(\"x-request-id\")\n2072\t .unwrap()\n2073\t .to_str()\n2074\t .unwrap();\n2075\t\n2076\t // Verify IDs are different (UUIDv7 timestamp ensures this)\n2077\t assert_ne!(\n2078\t id1, id2,\n2079\t \"Two consecutive requests should have different request IDs\"\n2080\t );\n2081\t\n2082\t // Both should still be valid 8-char hex\n2083\t assert_eq!(id1.len(), 8);\n2084\t assert_eq!(id2.len(), 8);\n2085\t }\n2086\t\n2087\t #[tokio::test]\n2088\t async fn test_request_id_middleware_preserves_existing_header() {\n2089\t use axum::{routing::get, Router};\n2090\t use http_body_util::Full;\n2091\t use tower::ServiceExt;\n2092\t\n2093\t // Build a simple router with the request ID middleware\n2094\t let app = Router::new()\n2095\t .route(\"/test\", get(|| async { \"OK\" }))\n2096\t .layer(axum::middleware::from_fn(request_id_middleware));\n2097\t\n2098\t // Create a request with a pre-existing X-Request-Id header\n2099\t let existing_id = \"deadbeef\";\n2100\t let request = Request::builder()\n2101\t .uri(\"/test\")\n2102\t .header(\"x-request-id\", existing_id)\n2103\t .body(Full::default())\n2104\t .unwrap();\n2105\t\n2106\t // Send the request\n2107\t let response = app.oneshot(request).await.unwrap();\n2108\t\n2109\t // Verify the header is preserved\n2110\t let header = response\n2111\t .headers()\n2112\t .get(\"x-request-id\")\n2113\t .expect(\"X-Request-Id header should be present\");\n2114\t let header_value = header.to_str().unwrap();\n2115\t\n2116\t assert_eq!(\n2117\t header_value, existing_id,\n2118\t \"Existing X-Request-Id should be preserved\"\n2119\t );\n2120\t }\n2121\t}\n2122\t"}]},"parent_tool_use_id":"call_fbc4ae069de4433aa2e41c0c","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"256ae644-975f-44c6-a8c6-002ba1eabcca","timestamp":"2026-05-23T06:22:59.128Z"} +{"type":"system","subtype":"task_progress","task_id":"af072207fd7dde702","tool_use_id":"call_fbc4ae069de4433aa2e41c0c","description":"Reading crates/miroir-proxy/src/auth.rs","usage":{"total_tokens":0,"tool_uses":10,"duration_ms":13701},"last_tool_name":"Read","uuid":"5494d83c-bc3f-48b5-835a-1a45f71d639f","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379"} 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+{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_10b351ab7c8c46e898d14f72","type":"tool_result","content":"1\t//! Bearer-token dispatch per plan §5 rules 0–5.\n2\t//!\n3\t//! Three token types can appear on `Authorization: Bearer ` simultaneously:\n4\t//! the `master_key`, the `admin_key`, and a search UI JWT. Miroir resolves them\n5\t//! deterministically in the order specified by §5.\n6\t//!\n7\t//! JWT signing-secret rotation (plan §9):\n8\t//! - Primary secret (`SEARCH_UI_JWT_SECRET`) signs new tokens; `kid` header identifies it.\n9\t//! - Optional previous secret (`SEARCH_UI_JWT_SECRET_PREVIOUS`) is present only during\n10\t//! the rotation overlap window. Validation accepts either secret.\n11\t\n12\tuse axum::{\n13\t extract::{FromRef, Request, State},\n14\t http::{HeaderMap, Method},\n15\t middleware::Next,\n16\t response::{IntoResponse, Response},\n17\t};\n18\tuse base64::{engine::general_purpose::URL_SAFE_NO_PAD, Engine as _};\n19\tuse dashmap::DashMap;\n20\tuse hmac::{Hmac, Mac};\n21\tuse miroir_core::{task_store::TaskStore, MeilisearchError, MiroirCode};\n22\tuse prometheus::Counter;\n23\tuse rand::RngCore;\n24\tuse serde::{Deserialize, Serialize};\n25\tuse sha2::Sha256;\n26\tuse std::sync::Arc;\n27\tuse subtle::ConstantTimeEq;\n28\t\n29\tuse crate::admin_session::{self, SealKey};\n30\t\n31\ttype HmacSha256 = Hmac;\n32\t\n33\t/// Extension carried in the request after successful cookie unseal.\n34\t/// Handlers extract this to look up the session in the task store.\n35\t#[derive(Debug, Clone)]\n36\tpub struct AdminSessionId(pub String);\n37\t\n38\t/// State for CSRF middleware, combining AuthState with task store access.\n39\t#[derive(Clone)]\n40\tpub struct CsrfState {\n41\t pub auth: AuthState,\n42\t pub redis_store: Option,\n43\t}\n44\t\n45\t// ---------------------------------------------------------------------------\n46\t// JWT claims (plan §13.21)\n47\t// ---------------------------------------------------------------------------\n48\t\n49\t/// Claims embedded in a search UI JWT session token.\n50\t#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]\n51\tpub struct JwtClaims {\n52\t /// Subject — user identifier or \"anonymous\".\n53\t pub sub: String,\n54\t /// Index this token grants access to.\n55\t pub idx: String,\n56\t /// Granted scope (e.g. \"search\").\n57\t pub scope: String,\n58\t /// Issued-at timestamp (seconds since epoch).\n59\t pub iat: u64,\n60\t /// Expiration timestamp (seconds since epoch).\n61\t pub exp: u64,\n62\t}\n63\t\n64\t/// Key ID embedded in the JWT header to identify which secret signed it.\n65\tconst KID_PRIMARY: &str = \"primary\";\n66\tconst KID_PREVIOUS: &str = \"previous\";\n67\t\n68\t/// JWT header (always HS256).\n69\t#[derive(Debug, Clone, Serialize, Deserialize)]\n70\tstruct JwtHeader {\n71\t alg: String,\n72\t kid: String,\n73\t typ: String,\n74\t}\n75\t\n76\t// ---------------------------------------------------------------------------\n77\t// Minimal HS256 JWT encode / decode (no external JWT crate needed)\n78\t// ---------------------------------------------------------------------------\n79\t\n80\t/// Encode and sign a JWT with the given secret.\n81\tfn jwt_encode(header: &JwtHeader, claims: &JwtClaims, secret: &[u8]) -> Result {\n82\t let header_json = serde_json::to_string(header).map_err(|e| e.to_string())?;\n83\t let claims_json = serde_json::to_string(claims).map_err(|e| e.to_string())?;\n84\t\n85\t let header_b64 = URL_SAFE_NO_PAD.encode(header_json.as_bytes());\n86\t let payload_b64 = URL_SAFE_NO_PAD.encode(claims_json.as_bytes());\n87\t\n88\t let signing_input = format!(\"{}.{}\", header_b64, payload_b64);\n89\t\n90\t let mut mac =\n91\t HmacSha256::new_from_slice(secret).map_err(|e| format!(\"HMAC init: {}\", e))?;\n92\t mac.update(signing_input.as_bytes());\n93\t let sig = mac.finalize().into_bytes();\n94\t let sig_b64 = URL_SAFE_NO_PAD.encode(sig);\n95\t\n96\t Ok(format!(\"{}.{}.{}\", header_b64, payload_b64, sig_b64))\n97\t}\n98\t\n99\t/// Decode and verify a JWT with the given secret. Returns (header, claims).\n100\tfn jwt_decode(\n101\t token: &str,\n102\t secret: &[u8],\n103\t) -> Result<(JwtHeader, JwtClaims), JwtValidationError> {\n104\t let parts: Vec<&str> = token.split('.').collect();\n105\t if parts.len() != 3 {\n106\t return Err(JwtValidationError::Malformed);\n107\t }\n108\t\n109\t let header_bytes = URL_SAFE_NO_PAD\n110\t .decode(parts[0])\n111\t .map_err(|_| JwtValidationError::Malformed)?;\n112\t let header: JwtHeader =\n113\t serde_json::from_slice(&header_bytes).map_err(|_| JwtValidationError::Malformed)?;\n114\t\n115\t if header.alg != \"HS256\" {\n116\t return Err(JwtValidationError::Malformed);\n117\t }\n118\t\n119\t // Verify signature\n120\t let signing_input = format!(\"{}.{}\", parts[0], parts[1]);\n121\t let mut mac = HmacSha256::new_from_slice(secret).unwrap();\n122\t mac.update(signing_input.as_bytes());\n123\t let expected_sig = mac.finalize().into_bytes();\n124\t\n125\t let actual_sig = URL_SAFE_NO_PAD\n126\t .decode(parts[2])\n127\t .map_err(|_| JwtValidationError::InvalidSignature)?;\n128\t\n129\t use subtle::ConstantTimeEq as _;\n130\t let sig_valid: bool = actual_sig.ct_eq(&expected_sig).into();\n131\t if !sig_valid {\n132\t return Err(JwtValidationError::InvalidSignature);\n133\t }\n134\t\n135\t // Decode claims\n136\t let claims_bytes = URL_SAFE_NO_PAD\n137\t .decode(parts[1])\n138\t .map_err(|_| JwtValidationError::Malformed)?;\n139\t let claims: JwtClaims =\n140\t serde_json::from_slice(&claims_bytes).map_err(|_| JwtValidationError::Malformed)?;\n141\t\n142\t // Check expiration with 30s leeway\n143\t let now = epoch_seconds();\n144\t if claims.exp + 30 < now {\n145\t return Err(JwtValidationError::Expired);\n146\t }\n147\t\n148\t Ok((header, claims))\n149\t}\n150\t\n151\t// ---------------------------------------------------------------------------\n152\t// Auth state (shared via axum State)\n153\t// ---------------------------------------------------------------------------\n154\t\n155\t/// Configuration needed by the bearer-token dispatch chain.\n156\t#[derive(Clone)]\n157\tpub struct AuthState {\n158\t pub master_key: String,\n159\t pub admin_key: String,\n160\t /// HMAC secret for signing/validating search UI JWTs (primary).\n161\t pub jwt_primary: Option,\n162\t /// Optional previous secret active during rotation overlap window.\n163\t pub jwt_previous: Option,\n164\t /// Key for sealing/unsealing admin session cookies (XChaCha20-Poly1305).\n165\t pub seal_key: SealKey,\n166\t /// In-memory set of revoked admin session IDs (populated on logout, Pub/Sub).\n167\t pub revoked_sessions: Arc>,\n168\t /// Counter for revoked admin sessions (miroir_admin_session_revoked_total).\n169\t pub admin_session_revoked_total: Counter,\n170\t}\n171\t\n172\timpl std::fmt::Debug for AuthState {\n173\t fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {\n174\t f.debug_struct(\"AuthState\")\n175\t .field(\"master_key\", &\"[redacted]\")\n176\t .field(\"admin_key\", &\"[redacted]\")\n177\t .field(\"jwt_primary\", &self.jwt_primary.as_ref().map(|_| \"[set]\"))\n178\t .field(\"jwt_previous\", &self.jwt_previous.as_ref().map(|_| \"[set]\"))\n179\t .field(\"seal_key\", &self.seal_key)\n180\t .field(\"revoked_sessions\", &self.revoked_sessions.len())\n181\t .finish_non_exhaustive()\n182\t }\n183\t}\n184\t\n185\t// ---------------------------------------------------------------------------\n186\t// JWT signing / validation helpers\n187\t// ---------------------------------------------------------------------------\n188\t\n189\timpl AuthState {\n190\t /// Create a new signed JWT session token for the given index.\n191\t /// Always signs with the primary secret; `kid` header identifies it.\n192\t pub fn sign_jwt(&self, sub: &str, idx: &str, scope: &str, ttl_s: u64) -> Option {\n193\t let secret = self.jwt_primary.as_ref()?;\n194\t let now = epoch_seconds();\n195\t let claims = JwtClaims {\n196\t sub: sub.to_string(),\n197\t idx: idx.to_string(),\n198\t scope: scope.to_string(),\n199\t iat: now,\n200\t exp: now + ttl_s,\n201\t };\n202\t let header = JwtHeader {\n203\t alg: \"HS256\".to_string(),\n204\t kid: KID_PRIMARY.to_string(),\n205\t typ: \"JWT\".to_string(),\n206\t };\n207\t jwt_encode(&header, &claims, secret.as_bytes()).ok()\n208\t }\n209\t\n210\t /// Validate a JWT string against either the primary or previous secret.\n211\t /// Returns the parsed claims if validation succeeds, or an error.\n212\t pub fn validate_jwt(&self, token: &str) -> Result {\n213\t // Try primary secret first\n214\t if let Some(ref secret) = self.jwt_primary {\n215\t match jwt_decode(token, secret.as_bytes()) {\n216\t Ok((_header, claims)) => return Ok(claims),\n217\t Err(JwtValidationError::Expired) => return Err(JwtValidationError::Expired),\n218\t _ => {} // signature mismatch — try previous\n219\t }\n220\t }\n221\t\n222\t // Try previous secret (rotation overlap window)\n223\t if let Some(ref secret) = self.jwt_previous {\n224\t if secret.is_empty() {\n225\t return Err(JwtValidationError::PreviousSecretEmpty);\n226\t }\n227\t match jwt_decode(token, secret.as_bytes()) {\n228\t Ok((_header, claims)) => return Ok(claims),\n229\t Err(JwtValidationError::Expired) => return Err(JwtValidationError::Expired),\n230\t _ => {} // signature mismatch\n231\t }\n232\t }\n233\t\n234\t Err(JwtValidationError::InvalidSignature)\n235\t }\n236\t}\n237\t\n238\t/// Errors returned by JWT validation.\n239\t#[derive(Debug, Clone, PartialEq, Eq)]\n240\tpub enum JwtValidationError {\n241\t /// Token structure is invalid or alg is not HS256.\n242\t Malformed,\n243\t /// HMAC signature did not match any loaded secret.\n244\t InvalidSignature,\n245\t /// Token has expired.\n246\t Expired,\n247\t /// `SEARCH_UI_JWT_SECRET_PREVIOUS` is set to the empty string (leak response).\n248\t PreviousSecretEmpty,\n249\t}\n250\t\n251\t// ---------------------------------------------------------------------------\n252\t// CSRF token generation (plan §9)\n253\t// ---------------------------------------------------------------------------\n254\t\n255\t/// Generate a cryptographically random CSRF token.\n256\t/// Returns a URL-safe base64-encoded 32-byte token.\n257\tpub fn generate_csrf_token() -> String {\n258\t let mut bytes = [0u8; 32];\n259\t rand::rngs::OsRng.fill_bytes(&mut bytes);\n260\t URL_SAFE_NO_PAD.encode(&bytes)\n261\t}\n262\t\n263\t/// Extract the CSRF token from the `X-CSRF-Token` header.\n264\tpub fn extract_csrf_token(headers: &HeaderMap) -> Option {\n265\t headers.get(\"X-CSRF-Token\")?.to_str().ok().map(String::from)\n266\t}\n267\t\n268\t/// Constant-time comparison of CSRF tokens.\n269\tpub fn constant_time_csrf_compare(token: &str, expected: &str) -> bool {\n270\t constant_time_compare(token.as_bytes(), expected.as_bytes())\n271\t}\n272\t\n273\t/// Validate a CSRF token against the expected session token.\n274\t/// Returns Ok(()) if the token matches, or a CsrfMismatch error.\n275\tpub fn validate_csrf_token(provided: &str, expected: &str) -> Result<(), MiroirCode> {\n276\t if constant_time_csrf_compare(provided, expected) {\n277\t Ok(())\n278\t } else {\n279\t Err(MiroirCode::CsrfMismatch)\n280\t }\n281\t}\n282\t\n283\t// ---------------------------------------------------------------------------\n284\t// Origin validation (plan §9)\n285\t// ---------------------------------------------------------------------------\n286\t\n287\t/// Result of origin validation.\n288\t#[derive(Debug, Clone, PartialEq, Eq)]\n289\tpub enum OriginVerdict {\n290\t /// Origin is allowed.\n291\t Allowed,\n292\t /// Origin is not in the allowed list.\n293\t Forbidden,\n294\t /// No Origin/Referer header present (for same-origin requests).\n295\t Missing,\n296\t}\n297\t\n298\t/// Validate the Origin header against the allowed origins list.\n299\t/// Handles special \"same-origin\" value by comparing against the Host header.\n300\tpub fn validate_origin(\n301\t headers: &HeaderMap,\n302\t allowed_origins: &[String],\n303\t is_same_origin_by_default: bool,\n304\t) -> OriginVerdict {\n305\t // Try Origin header first (preferred for POST/DELETE/PUT)\n306\t let origin = headers.get(\"origin\").and_then(|h| h.to_str().ok());\n307\t\n308\t // Fall back to Referer header (for navigational requests)\n309\t let referer = origin.or_else(|| headers.get(\"referer\").and_then(|h| h.to_str().ok()));\n310\t\n311\t let provided_origin = match referer {\n312\t Some(o) => o,\n313\t None => {\n314\t // No Origin or Referer header - for same-origin requests, this is acceptable\n315\t return if is_same_origin_by_default {\n316\t OriginVerdict::Missing\n317\t } else {\n318\t OriginVerdict::Forbidden\n319\t };\n320\t }\n321\t };\n322\t\n323\t // Strip path from Referer to get origin\n324\t let provided_origin = if let Some(ref_hdr) = headers.get(\"referer\") {\n325\t if let Ok(ref_val) = ref_hdr.to_str() {\n326\t // Find the first '/' after \"https://\" (skip the first 8 chars: \"https://\")\n327\t if let Some(idx) = ref_val.chars().enumerate().skip(8).find(|(_, c)| *c == '/').map(|(i, _)| i) {\n328\t &ref_val[..idx]\n329\t } else {\n330\t ref_val\n331\t }\n332\t } else {\n333\t provided_origin\n334\t }\n335\t } else {\n336\t provided_origin\n337\t };\n338\t\n339\t // Check against allowed origins\n340\t for allowed in allowed_origins {\n341\t // Special \"same-origin\" value - compare against Host header\n342\t if allowed == \"same-origin\" {\n343\t if let Some(host) = headers.get(\"host\").and_then(|h| h.to_str().ok()) {\n344\t // Construct origin from scheme (https) and host\n345\t let same_origin = format!(\"https://{}\", host);\n346\t if provided_origin == same_origin || provided_origin == host {\n347\t return OriginVerdict::Allowed;\n348\t }\n349\t }\n350\t } else if allowed == \"*\" {\n351\t // Wildcard allows any origin\n352\t return OriginVerdict::Allowed;\n353\t } else if provided_origin == allowed {\n354\t return OriginVerdict::Allowed;\n355\t }\n356\t }\n357\t\n358\t OriginVerdict::Forbidden\n359\t}\n360\t\n361\t// ---------------------------------------------------------------------------\n362\t// CSP header builder (plan §9)\n363\t// ---------------------------------------------------------------------------\n364\t\n365\t/// Build a CSP header value by merging base template with overrides.\n366\t/// Overrides are merged additively - they never replace the base template.\n367\tpub fn build_csp_header(\n368\t base_template: &str,\n369\t overrides: &miroir_core::config::CspOverridesConfig,\n370\t) -> String {\n371\t let mut directives: Vec<(String, Vec)> = base_template\n372\t .split(';')\n373\t .map(|s| s.trim())\n374\t .filter(|s| !s.is_empty())\n375\t .map(|directive| {\n376\t let parts: Vec<&str> = directive.splitn(2, ' ').collect();\n377\t if parts.len() == 2 {\n378\t (parts[0].to_lowercase(), vec![parts[1].to_string()])\n379\t } else {\n380\t (parts[0].to_lowercase(), vec![])\n381\t }\n382\t })\n383\t .collect();\n384\t\n385\t // Helper to merge overrides into a directive\n386\t let merge_into = |directives: &mut Vec<(String, Vec)>,\n387\t name: &str,\n388\t values: &[String]| {\n389\t if values.is_empty() {\n390\t return;\n391\t }\n392\t let name_lower = name.to_lowercase();\n393\t if let Some(entry) = directives.iter_mut().find(|(n, _)| n == &name_lower) {\n394\t // Append to existing directive\n395\t entry.1.extend(values.iter().cloned());\n396\t entry.1.dedup(); // Remove duplicates\n397\t } else {\n398\t // Add new directive\n399\t directives.push((name_lower, values.to_vec()));\n400\t }\n401\t };\n402\t\n403\t // Merge each override category\n404\t merge_into(&mut directives, \"script-src\", &overrides.script_src);\n405\t merge_into(&mut directives, \"img-src\", &overrides.img_src);\n406\t merge_into(&mut directives, \"connect-src\", &overrides.connect_src);\n407\t\n408\t // Rebuild CSP string\n409\t directives\n410\t .into_iter()\n411\t .map(|(name, values)| {\n412\t if values.is_empty() {\n413\t name\n414\t } else {\n415\t format!(\"{} {}\", name, values.join(\" \"))\n416\t }\n417\t })\n418\t .collect::>()\n419\t .join(\"; \")\n420\t}\n421\t\n422\t// ---------------------------------------------------------------------------\n423\t// Dispatch verdict\n424\t// ---------------------------------------------------------------------------\n425\t\n426\t/// Result of the bearer-token dispatch chain.\n427\t#[derive(Debug, Clone, PartialEq, Eq)]\n428\tpub enum AuthVerdict {\n429\t /// Request is dispatch-exempt (rule 0); handler decides auth.\n430\t Exempt,\n431\t /// Authenticated with the given token kind.\n432\t Authenticated(TokenKind),\n433\t /// Bearer token looked like a JWT but failed validation (rule 1).\n434\t JwtInvalid,\n435\t /// JWT was signature-valid but scope was insufficient (rule 1).\n436\t JwtScopeDenied,\n437\t /// No matching key / missing Authorization (rule 4).\n438\t InvalidAuth,\n439\t}\n440\t\n441\t/// Which key or token type satisfied authentication.\n442\t#[derive(Debug, Clone, PartialEq, Eq)]\n443\tpub enum TokenKind {\n444\t MasterKey,\n445\t AdminKey,\n446\t /// JWT validated against primary or previous secret.\n447\t Jwt,\n448\t /// Admin session cookie — sealed session ID validated against task store.\n449\t AdminSession,\n450\t}\n451\t\n452\timpl AuthVerdict {\n453\t pub fn is_allowed(&self) -> bool {\n454\t matches!(self, AuthVerdict::Exempt | AuthVerdict::Authenticated(_))\n455\t }\n456\t}\n457\t\n458\t// ---------------------------------------------------------------------------\n459\t// Rule 0 — dispatch-exempt check\n460\t// ---------------------------------------------------------------------------\n461\t\n462\t/// Returns true when `(method, path)` is in the exhaustive dispatch-exempt list\n463\t/// (plan §5 rule 5). Exempt endpoints run their handler directly; rules 1–4\n464\t/// are never consulted.\n465\tpub fn is_dispatch_exempt(method: &Method, path: &str) -> bool {\n466\t // `GET /health` — unauthenticated liveness probe (Meilisearch-compatible)\n467\t if method == Method::GET && path == \"/health\" {\n468\t return true;\n469\t }\n470\t\n471\t // `GET /version` — unauthenticated version endpoint (Meilisearch-compatible)\n472\t if method == Method::GET && path == \"/version\" {\n473\t return true;\n474\t }\n475\t\n476\t // `GET /_miroir/ready` — unauthenticated readiness probe (plan §10)\n477\t if method == Method::GET && path == \"/_miroir/ready\" {\n478\t return true;\n479\t }\n480\t\n481\t // `GET /_miroir/ui/search/locale/*` — unauthenticated public locale fetch\n482\t if method == Method::GET {\n483\t if let Some(rest) = path.strip_prefix(\"/_miroir/ui/search/locale/\") {\n484\t // Must have at least one path segment after the prefix\n485\t return !rest.is_empty() && !rest.contains(\"//\");\n486\t }\n487\t }\n488\t\n489\t // `POST /_miroir/admin/login` — credentials in body\n490\t if method == Method::POST && path == \"/_miroir/admin/login\" {\n491\t return true;\n492\t }\n493\t\n494\t // `GET /_miroir/ui/search/{index}/session` — auth per search_ui.auth.mode\n495\t if method == Method::GET {\n496\t if let Some(rest) = path.strip_prefix(\"/_miroir/ui/search/\") {\n497\t let segments: Vec<&str> = rest.split('/').collect();\n498\t if segments.len() == 2 && segments[1] == \"session\" && !segments[0].is_empty() {\n499\t return true;\n500\t }\n501\t }\n502\t }\n503\t\n504\t // `GET /ui/search/{index}` — public SPA entry point\n505\t if method == Method::GET {\n506\t if let Some(rest) = path.strip_prefix(\"/ui/search/\") {\n507\t // Single non-empty segment (the index name)\n508\t return !rest.is_empty() && !rest.contains('/');\n509\t }\n510\t }\n511\t\n512\t false\n513\t}\n514\t\n515\t// ---------------------------------------------------------------------------\n516\t// Rule 1 — JWT-shape probe\n517\t// ---------------------------------------------------------------------------\n518\t\n519\t/// Returns true if `token` has the structural shape of a JWT (three\n520\t/// dot-separated base64url segments).\n521\tpub fn probe_jwt_shape(token: &str) -> bool {\n522\t let parts: Vec<&str> = token.split('.').collect();\n523\t if parts.len() != 3 {\n524\t return false;\n525\t }\n526\t // Each segment should be non-empty and look like base64url\n527\t parts.iter().all(|s| {\n528\t !s.is_empty()\n529\t && s.chars().all(|c| c.is_ascii_alphanumeric() || c == '-' || c == '_' || c == '=')\n530\t })\n531\t}\n532\t\n533\t// ---------------------------------------------------------------------------\n534\t// Helper — admin path check\n535\t// ---------------------------------------------------------------------------\n536\t\n537\t/// Returns true if `path` starts with `/_miroir/` (admin surface).\n538\tpub fn is_admin_path(path: &str) -> bool {\n539\t path.starts_with(\"/_miroir/\")\n540\t}\n541\t\n542\t// ---------------------------------------------------------------------------\n543\t// Constant-time opaque key comparison\n544\t// ---------------------------------------------------------------------------\n545\t\n546\t/// Constant-time comparison of an opaque token against an expected key.\n547\t/// Prevents timing side-channels on secret key values.\n548\tpub fn constant_time_compare(token: &[u8], expected: &[u8]) -> bool {\n549\t token.ct_eq(expected).into()\n550\t}\n551\t\n552\t// ---------------------------------------------------------------------------\n553\t// Core dispatch — rules 0–4\n554\t// ---------------------------------------------------------------------------\n555\t\n556\t/// Execute the full bearer-token dispatch chain for a request.\n557\t///\n558\t/// `bearer_token` is the raw value after stripping `\"Bearer \"` from the\n559\t/// `Authorization` header (may be `None` if the header is absent).\n560\tpub fn dispatch_bearer(\n561\t method: &Method,\n562\t path: &str,\n563\t bearer_token: Option<&str>,\n564\t state: &AuthState,\n565\t) -> AuthVerdict {\n566\t // Rule 0 — dispatch-exempt endpoints skip all auth checks\n567\t if is_dispatch_exempt(method, path) {\n568\t return AuthVerdict::Exempt;\n569\t }\n570\t\n571\t let token = match bearer_token {\n572\t Some(t) => t,\n573\t None => return AuthVerdict::InvalidAuth, // Rule 4 — missing auth\n574\t };\n575\t\n576\t // Rule 1 — JWT-shape probe, then full validation\n577\t if probe_jwt_shape(token) {\n578\t match state.validate_jwt(token) {\n579\t Ok(_claims) => return AuthVerdict::Authenticated(TokenKind::Jwt),\n580\t Err(JwtValidationError::PreviousSecretEmpty) => {\n581\t return AuthVerdict::JwtInvalid;\n582\t }\n583\t Err(_) => {\n584\t return AuthVerdict::JwtInvalid;\n585\t }\n586\t }\n587\t }\n588\t\n589\t // Rule 2 — admin-path opaque-token match\n590\t if is_admin_path(path) {\n591\t if constant_time_compare(token.as_bytes(), state.admin_key.as_bytes()) {\n592\t return AuthVerdict::Authenticated(TokenKind::AdminKey);\n593\t }\n594\t return AuthVerdict::InvalidAuth; // Rule 4\n595\t }\n596\t\n597\t // Rule 3 — master-key match (non-admin paths)\n598\t if constant_time_compare(token.as_bytes(), state.master_key.as_bytes()) {\n599\t return AuthVerdict::Authenticated(TokenKind::MasterKey);\n600\t }\n601\t\n602\t // Rule 4 — mismatch\n603\t AuthVerdict::InvalidAuth\n604\t}\n605\t\n606\t// ---------------------------------------------------------------------------\n607\t// X-Admin-Key short-circuit\n608\t// ---------------------------------------------------------------------------\n609\t\n610\t/// Check the `X-Admin-Key` header for admin endpoints.\n611\t/// Returns `true` if the header is present and matches `admin_key`.\n612\t/// Evaluated independently of the bearer chain — short-circuits directly.\n613\tpub fn check_x_admin_key(headers: &HeaderMap, admin_key: &[u8]) -> bool {\n614\t match headers.get(\"X-Admin-Key\").and_then(|v| v.to_str().ok()) {\n615\t Some(key) => constant_time_compare(key.as_bytes(), admin_key),\n616\t None => false,\n617\t }\n618\t}\n619\t\n620\t// ---------------------------------------------------------------------------\n621\t// Axum middleware\n622\t// ---------------------------------------------------------------------------\n623\t\n624\t/// Extract the bearer token from `Authorization: Bearer `.\n625\tfn extract_bearer(headers: &HeaderMap) -> Option<&str> {\n626\t let auth = headers.get(\"authorization\")?.to_str().ok()?;\n627\t auth.strip_prefix(\"Bearer \")\n628\t}\n629\t\n630\t/// Extract the sealed admin session cookie value from the Cookie header.\n631\tpub fn extract_admin_session_cookie(headers: &HeaderMap) -> Option {\n632\t let cookie_header = headers.get(\"cookie\")?.to_str().ok()?;\n633\t for pair in cookie_header.split(';') {\n634\t let pair = pair.trim();\n635\t if let Some(value) = pair.strip_prefix(&format!(\"{}=\", admin_session::COOKIE_NAME)) {\n636\t return Some(value.to_string());\n637\t }\n638\t }\n639\t None\n640\t}\n641\t\n642\t/// Unseal an admin session cookie, returning the session ID.\n643\tpub fn unseal_admin_cookie(cookie_value: &str, key: &SealKey) -> Result {\n644\t admin_session::unseal_session(cookie_value, key)\n645\t}\n646\t\n647\t/// Axum middleware implementing the bearer-token dispatch chain (plan §5).\n648\tpub async fn auth_middleware(\n649\t State(state): State,\n650\t req: Request,\n651\t next: Next,\n652\t) -> Response {\n653\t let method = req.method().clone();\n654\t let path = req.uri().path().to_string();\n655\t\n656\t // Rule 0 — dispatch-exempt: skip everything, handler decides auth\n657\t if is_dispatch_exempt(&method, &path) {\n658\t return next.run(req).await;\n659\t }\n660\t\n661\t // X-Admin-Key short-circuit for admin endpoints\n662\t if is_admin_path(&path) && check_x_admin_key(req.headers(), state.admin_key.as_bytes()) {\n663\t return next.run(req).await;\n664\t }\n665\t\n666\t // Admin session cookie check for admin endpoints (plan §9, §13.19).\n667\t // If a sealed admin session cookie is present, unseal it and authenticate.\n668\t // Revoked sessions are rejected immediately.\n669\t if is_admin_path(&path) {\n670\t if let Some(cookie_value) = extract_admin_session_cookie(req.headers()) {\n671\t match unseal_admin_cookie(&cookie_value, &state.seal_key) {\n672\t Ok(session_id) => {\n673\t // Check revocation cache (populated on logout + Pub/Sub).\n674\t if state.revoked_sessions.contains_key(&session_id) {\n675\t return MeilisearchError::new(\n676\t MiroirCode::InvalidAuth,\n677\t \"Admin session has been revoked.\",\n678\t )\n679\t .into_response();\n680\t }\n681\t let mut req = req;\n682\t req.extensions_mut().insert(AdminSessionId(session_id));\n683\t return next.run(req).await;\n684\t }\n685\t Err(e) => {\n686\t // Cookie tampering or wrong seal key (e.g. cross-pod key\n687\t // mismatch in HA). Log a warning so operators can diagnose\n688\t // ADMIN_SESSION_SEAL_KEY divergence across pods.\n689\t tracing::warn!(\n690\t path = %path,\n691\t error = %e,\n692\t \"admin session cookie unseal failed — tampered cookie or cross-pod key mismatch\"\n693\t );\n694\t }\n695\t }\n696\t }\n697\t }\n698\t\n699\t // Extract bearer token\n700\t let bearer = extract_bearer(req.headers());\n701\t\n702\t // Run the dispatch chain\n703\t let verdict = dispatch_bearer(&method, &path, bearer, &state);\n704\t\n705\t match verdict {\n706\t AuthVerdict::Authenticated(_) | AuthVerdict::Exempt => next.run(req).await,\n707\t AuthVerdict::JwtInvalid => MeilisearchError::new(\n708\t MiroirCode::JwtInvalid,\n709\t \"The provided JWT is invalid or expired.\",\n710\t )\n711\t .into_response(),\n712\t AuthVerdict::JwtScopeDenied => MeilisearchError::new(\n713\t MiroirCode::JwtScopeDenied,\n714\t \"The provided JWT does not grant access to this resource.\",\n715\t )\n716\t .into_response(),\n717\t AuthVerdict::InvalidAuth => MeilisearchError::new(\n718\t MiroirCode::InvalidAuth,\n719\t \"The provided authorization is invalid.\",\n720\t )\n721\t .into_response(),\n722\t }\n723\t}\n724\t\n725\t// ---------------------------------------------------------------------------\n726\t// CSRF validation middleware (plan §9)\n727\t// ---------------------------------------------------------------------------\n728\t\n729\t/// CSRF middleware that validates `X-CSRF-Token` on state-changing requests.\n730\t///\n731\t/// Bypasses CSRF check when:\n732\t/// - Request is authenticated via Bearer token (not admin session cookie)\n733\t/// - X-Admin-Key header is present\n734\t/// - Request method is safe (GET, HEAD, OPTIONS)\n735\t/// - Path is dispatch-exempt\n736\t///\n737\t/// For admin session cookie auth, requires `X-CSRF-Token` header to match\n738\t/// the token stored in the session.\n739\tpub async fn csrf_middleware(\n740\t State(state): State,\n741\t req: Request,\n742\t next: Next,\n743\t) -> Response {\n744\t let method = req.method().clone();\n745\t let path = req.uri().path().to_string();\n746\t\n747\t // Skip CSRF for safe methods\n748\t if matches!(method, Method::GET | Method::HEAD | Method::OPTIONS) {\n749\t return next.run(req).await;\n750\t }\n751\t\n752\t // Skip CSRF for non-admin paths\n753\t if !is_admin_path(&path) {\n754\t return next.run(req).await;\n755\t }\n756\t\n757\t // Skip CSRF for dispatch-exempt endpoints\n758\t if is_dispatch_exempt(&method, &path) {\n759\t return next.run(req).await;\n760\t }\n761\t\n762\t // Skip CSRF if X-Admin-Key is present (bypasses CSRF)\n763\t if check_x_admin_key(req.headers(), state.auth.admin_key.as_bytes()) {\n764\t return next.run(req).await;\n765\t }\n766\t\n767\t // Check if authenticated via admin session cookie\n768\t let has_session_cookie = extract_admin_session_cookie(req.headers()).is_some();\n769\t let has_bearer_token = extract_bearer(req.headers()).is_some();\n770\t\n771\t // CSRF only applies to session-cookie auth, not bearer tokens\n772\t if !has_session_cookie || has_bearer_token {\n773\t return next.run(req).await;\n774\t }\n775\t\n776\t // Extract CSRF token from header\n777\t let csrf_token = match extract_csrf_token(req.headers()) {\n778\t Some(token) => token,\n779\t None => {\n780\t return MeilisearchError::new(\n781\t MiroirCode::MissingCsrf,\n782\t \"CSRF token is required for state-changing requests.\",\n783\t )\n784\t .into_response();\n785\t }\n786\t };\n787\t\n788\t // Get session ID from extensions (set by auth_middleware)\n789\t let session_id = match req.extensions().get::() {\n790\t Some(id) => id.0.clone(),\n791\t None => {\n792\t // Session cookie was present but auth_middleware didn't set AdminSessionId\n793\t // This means the session was invalid/expired/revoked\n794\t return MeilisearchError::new(\n795\t MiroirCode::InvalidAuth,\n796\t \"Admin session is invalid or expired.\",\n797\t )\n798\t .into_response();\n799\t }\n800\t };\n801\t\n802\t // Validate CSRF token against session\n803\t let Some(redis_store) = state.redis_store.as_ref() else {\n804\t return MeilisearchError::new(\n805\t MiroirCode::InvalidAuth,\n806\t \"Admin sessions require Redis task store.\",\n807\t )\n808\t .into_response();\n809\t };\n810\t\n811\t let session = match redis_store.get_admin_session(&session_id) {\n812\t Ok(Some(s)) => s,\n813\t Ok(None) => {\n814\t return MeilisearchError::new(\n815\t MiroirCode::InvalidAuth,\n816\t \"Admin session not found.\",\n817\t )\n818\t .into_response();\n819\t }\n820\t Err(e) => {\n821\t tracing::warn!(error = %e, session_prefix = &session_id[..session_id.len().min(8)], \"failed to get admin session for CSRF validation\");\n822\t return MeilisearchError::new(\n823\t MiroirCode::InvalidAuth,\n824\t \"Failed to validate session.\",\n825\t )\n826\t .into_response();\n827\t }\n828\t };\n829\t\n830\t // Check if revoked\n831\t if session.revoked {\n832\t return MeilisearchError::new(\n833\t MiroirCode::InvalidAuth,\n834\t \"Admin session has been revoked.\",\n835\t )\n836\t .into_response();\n837\t }\n838\t\n839\t // Check expiration\n840\t let now = std::time::SystemTime::now()\n841\t .duration_since(std::time::UNIX_EPOCH)\n842\t .unwrap_or_default()\n843\t .as_secs() as i64;\n844\t if session.expires_at < now {\n845\t return MeilisearchError::new(\n846\t MiroirCode::InvalidAuth,\n847\t \"Admin session has expired.\",\n848\t )\n849\t .into_response();\n850\t }\n851\t\n852\t // Constant-time compare CSRF tokens\n853\t if !constant_time_csrf_compare(&csrf_token, &session.csrf_token) {\n854\t return MeilisearchError::new(\n855\t MiroirCode::CsrfMismatch,\n856\t \"CSRF token does not match the session token.\",\n857\t )\n858\t .into_response();\n859\t }\n860\t\n861\t next.run(req).await\n862\t}\n863\t\n864\t// ---------------------------------------------------------------------------\n865\t// Rate-limit hook types (Phase 2 in-memory stub, Phase 6 multi-pod)\n866\t// ---------------------------------------------------------------------------\n867\t\n868\t/// Rate-limit bucket key types wired into the dispatch chain.\n869\t/// Phase 2 keeps these as in-memory counters; Phase 6 will back them\n870\t/// with the task store (Redis/SQLite).\n871\t#[derive(Debug, Clone, PartialEq, Eq, Hash)]\n872\tpub enum RateLimitBucket {\n873\t /// `miroir:ratelimit:adminlogin:`\n874\t AdminLogin(String),\n875\t /// `miroir:ratelimit:searchui:`\n876\t SearchUi(String),\n877\t}\n878\t\n879\t/// In-memory rate limiter (Phase 2 stub). Always returns `Ok(())` — actual\n880\t/// enforcement is deferred to Phase 6 multi-pod. The hook is wired here so\n881\t/// handlers can call `limiter.check()` without cfg-gating.\n882\t#[derive(Debug, Clone, Default)]\n883\tpub struct RateLimiter;\n884\t\n885\timpl RateLimiter {\n886\t pub fn check(&self, _bucket: &RateLimitBucket) -> Result<(), ()> {\n887\t Ok(()) // Phase 2: always allow\n888\t }\n889\t}\n890\t\n891\t// ---------------------------------------------------------------------------\n892\t// Helpers\n893\t// ---------------------------------------------------------------------------\n894\t\n895\tfn epoch_seconds() -> u64 {\n896\t std::time::SystemTime::now()\n897\t .duration_since(std::time::UNIX_EPOCH)\n898\t .unwrap_or_default()\n899\t .as_secs()\n900\t}\n901\t\n902\t// ---------------------------------------------------------------------------\n903\t// Tests\n904\t// ---------------------------------------------------------------------------\n905\t\n906\t#[cfg(test)]\n907\tmod tests {\n908\t use super::*;\n909\t\n910\t fn test_key() -> SealKey {\n911\t SealKey::from_bytes([42u8; 32])\n912\t }\n913\t\n914\t fn test_state() -> AuthState {\n915\t AuthState {\n916\t master_key: \"master-key-123\".to_string(),\n917\t admin_key: \"admin-key-456\".to_string(),\n918\t jwt_primary: None,\n919\t jwt_previous: None,\n920\t seal_key: test_key(),\n921\t revoked_sessions: Arc::new(DashMap::new()),\n922\t admin_session_revoked_total: Counter::with_opts(\n923\t prometheus::Opts::new(\"test_revoked_total\", \"test\")\n924\t ).unwrap(),\n925\t }\n926\t }\n927\t\n928\t fn test_state_with_jwt() -> AuthState {\n929\t AuthState {\n930\t master_key: \"master-key-123\".to_string(),\n931\t admin_key: \"admin-key-456\".to_string(),\n932\t jwt_primary: Some(\"test-secret-primary-key-32byte\".to_string()),\n933\t jwt_previous: None,\n934\t seal_key: test_key(),\n935\t revoked_sessions: Arc::new(DashMap::new()),\n936\t admin_session_revoked_total: Counter::with_opts(\n937\t prometheus::Opts::new(\"test_revoked_total\", \"test\")\n938\t ).unwrap(),\n939\t }\n940\t }\n941\t\n942\t fn test_state_with_dual_jwt() -> AuthState {\n943\t AuthState {\n944\t master_key: \"master-key-123\".to_string(),\n945\t admin_key: \"admin-key-456\".to_string(),\n946\t jwt_primary: Some(\"test-secret-primary-key-32byte\".to_string()),\n947\t jwt_previous: Some(\"test-secret-previous-key-32byte\".to_string()),\n948\t seal_key: test_key(),\n949\t revoked_sessions: Arc::new(DashMap::new()),\n950\t admin_session_revoked_total: Counter::with_opts(\n951\t prometheus::Opts::new(\"test_revoked_total\", \"test\")\n952\t ).unwrap(),\n953\t }\n954\t }\n955\t\n956\t // -----------------------------------------------------------------------\n957\t // Rule 0 — dispatch-exempt tests\n958\t // -----------------------------------------------------------------------\n959\t\n960\t #[test]\n961\t fn get_metrics_requires_admin_key() {\n962\t assert!(!is_dispatch_exempt(&Method::GET, \"/_miroir/metrics\"));\n963\t assert!(!is_dispatch_exempt(&Method::POST, \"/_miroir/metrics\"));\n964\t }\n965\t\n966\t #[test]\n967\t fn exempt_get_locale_star() {\n968\t assert!(is_dispatch_exempt(&Method::GET, \"/_miroir/ui/search/locale/en-US\"));\n969\t assert!(is_dispatch_exempt(&Method::GET, \"/_miroir/ui/search/locale/fr\"));\n970\t }\n971\t\n972\t #[test]\n973\t fn exempt_get_locale_no_variant_not_exempt() {\n974\t assert!(!is_dispatch_exempt(&Method::GET, \"/_miroir/ui/search/locale/\"));\n975\t }\n976\t\n977\t #[test]\n978\t fn exempt_post_admin_login() {\n979\t assert!(is_dispatch_exempt(&Method::POST, \"/_miroir/admin/login\"));\n980\t }\n981\t\n982\t #[test]\n983\t fn exempt_get_admin_login_not_exempt() {\n984\t assert!(!is_dispatch_exempt(&Method::GET, \"/_miroir/admin/login\"));\n985\t }\n986\t\n987\t #[test]\n988\t fn exempt_get_session() {\n989\t assert!(is_dispatch_exempt(&Method::GET, \"/_miroir/ui/search/products/session\"));\n990\t }\n991\t\n992\t #[test]\n993\t fn exempt_get_session_no_index_not_exempt() {\n994\t assert!(!is_dispatch_exempt(&Method::GET, \"/_miroir/ui/search//session\"));\n995\t }\n996\t\n997\t #[test]\n998\t fn exempt_get_search_ui_spa() {\n999\t assert!(is_dispatch_exempt(&Method::GET, \"/ui/search/products\"));\n1000\t }\n1001\t\n1002\t #[test]\n1003\t fn exempt_get_search_ui_no_index_not_exempt() {\n1004\t assert!(!is_dispatch_exempt(&Method::GET, \"/ui/search/\"));\n1005\t }\n1006\t\n1007\t #[test]\n1008\t fn exempt_post_search_ui_not_exempt() {\n1009\t assert!(!is_dispatch_exempt(&Method::POST, \"/ui/search/products\"));\n1010\t }\n1011\t\n1012\t #[test]\n1013\t fn exempt_non_matching_path_not_exempt() {\n1014\t assert!(!is_dispatch_exempt(&Method::GET, \"/indexes/products\"));\n1015\t assert!(!is_dispatch_exempt(&Method::POST, \"/indexes\"));\n1016\t assert!(!is_dispatch_exempt(&Method::GET, \"/_miroir/other\"));\n1017\t }\n1018\t\n1019\t #[test]\n1020\t fn exempt_get_miroir_ready() {\n1021\t assert!(is_dispatch_exempt(&Method::GET, \"/_miroir/ready\"));\n1022\t assert!(!is_dispatch_exempt(&Method::POST, \"/_miroir/ready\"));\n1023\t }\n1024\t\n1025\t #[test]\n1026\t fn exempt_get_health() {\n1027\t assert!(is_dispatch_exempt(&Method::GET, \"/health\"));\n1028\t assert!(!is_dispatch_exempt(&Method::POST, \"/health\"));\n1029\t }\n1030\t\n1031\t #[test]\n1032\t fn exempt_get_version() {\n1033\t assert!(is_dispatch_exempt(&Method::GET, \"/version\"));\n1034\t assert!(!is_dispatch_exempt(&Method::POST, \"/version\"));\n1035\t }\n1036\t\n1037\t // -----------------------------------------------------------------------\n1038\t // Rule 0 — exempt endpoints skip auth entirely\n1039\t // -----------------------------------------------------------------------\n1040\t\n1041\t #[test]\n1042\t fn exempt_endpoint_ignores_admin_key() {\n1043\t let state = test_state();\n1044\t let verdict = dispatch_bearer(\n1045\t &Method::POST,\n1046\t \"/_miroir/admin/login\",\n1047\t Some(\"admin-key-456\"),\n1048\t &state,\n1049\t );\n1050\t assert_eq!(verdict, AuthVerdict::Exempt);\n1051\t }\n1052\t\n1053\t #[test]\n1054\t fn exempt_locale_ignores_all_tokens() {\n1055\t let state = test_state();\n1056\t let verdict = dispatch_bearer(\n1057\t &Method::GET,\n1058\t \"/_miroir/ui/search/locale/en-US\",\n1059\t Some(\"master-key-123\"),\n1060\t &state,\n1061\t );\n1062\t assert_eq!(verdict, AuthVerdict::Exempt);\n1063\t }\n1064\t\n1065\t #[test]\n1066\t fn exempt_session_ignores_all_tokens() {\n1067\t let state = test_state();\n1068\t let verdict = dispatch_bearer(\n1069\t &Method::GET,\n1070\t \"/_miroir/ui/search/products/session\",\n1071\t Some(\"admin-key-456\"),\n1072\t &state,\n1073\t );\n1074\t assert_eq!(verdict, AuthVerdict::Exempt);\n1075\t }\n1076\t\n1077\t #[test]\n1078\t fn exempt_spa_ignores_all_tokens() {\n1079\t let state = test_state();\n1080\t let verdict = dispatch_bearer(\n1081\t &Method::GET,\n1082\t \"/ui/search/products\",\n1083\t None,\n1084\t &state,\n1085\t );\n1086\t assert_eq!(verdict, AuthVerdict::Exempt);\n1087\t }\n1088\t\n1089\t #[test]\n1090\t fn exempt_ready_ignores_all_tokens() {\n1091\t let state = test_state();\n1092\t let verdict = dispatch_bearer(\n1093\t &Method::GET,\n1094\t \"/_miroir/ready\",\n1095\t Some(\"bogus-token\"),\n1096\t &state,\n1097\t );\n1098\t assert_eq!(verdict, AuthVerdict::Exempt);\n1099\t }\n1100\t\n1101\t #[test]\n1102\t fn exempt_health_ignores_all_tokens() {\n1103\t let state = test_state();\n1104\t let verdict = dispatch_bearer(\n1105\t &Method::GET,\n1106\t \"/health\",\n1107\t Some(\"bogus-token\"),\n1108\t &state,\n1109\t );\n1110\t assert_eq!(verdict, AuthVerdict::Exempt);\n1111\t }\n1112\t\n1113\t #[test]\n1114\t fn exempt_health_with_no_token() {\n1115\t let state = test_state();\n1116\t let verdict = dispatch_bearer(&Method::GET, \"/health\", None, &state);\n1117\t assert_eq!(verdict, AuthVerdict::Exempt);\n1118\t }\n1119\t\n1120\t #[test]\n1121\t fn exempt_version_ignores_all_tokens() {\n1122\t let state = test_state();\n1123\t let verdict = dispatch_bearer(\n1124\t &Method::GET,\n1125\t \"/version\",\n1126\t Some(\"bogus-token\"),\n1127\t &state,\n1128\t );\n1129\t assert_eq!(verdict, AuthVerdict::Exempt);\n1130\t }\n1131\t\n1132\t #[test]\n1133\t fn exempt_version_with_no_token() {\n1134\t let state = test_state();\n1135\t let verdict = dispatch_bearer(&Method::GET, \"/version\", None, &state);\n1136\t assert_eq!(verdict, AuthVerdict::Exempt);\n1137\t }\n1138\t\n1139\t // -----------------------------------------------------------------------\n1140\t // /_miroir/metrics requires admin key (not exempt)\n1141\t // -----------------------------------------------------------------------\n1142\t\n1143\t #[test]\n1144\t fn metrics_requires_admin_key() {\n1145\t let state = test_state();\n1146\t let verdict = dispatch_bearer(\n1147\t &Method::GET,\n1148\t \"/_miroir/metrics\",\n1149\t Some(\"admin-key-456\"),\n1150\t &state,\n1151\t );\n1152\t assert_eq!(verdict, AuthVerdict::Authenticated(TokenKind::AdminKey));\n1153\t }\n1154\t\n1155\t #[test]\n1156\t fn metrics_rejects_master_key() {\n1157\t let state = test_state();\n1158\t let verdict = dispatch_bearer(\n1159\t &Method::GET,\n1160\t \"/_miroir/metrics\",\n1161\t Some(\"master-key-123\"),\n1162\t &state,\n1163\t );\n1164\t assert_eq!(verdict, AuthVerdict::InvalidAuth);\n1165\t }\n1166\t\n1167\t #[test]\n1168\t fn metrics_rejects_missing_auth() {\n1169\t let state = test_state();\n1170\t let verdict = dispatch_bearer(\n1171\t &Method::GET,\n1172\t \"/_miroir/metrics\",\n1173\t None,\n1174\t &state,\n1175\t );\n1176\t assert_eq!(verdict, AuthVerdict::InvalidAuth);\n1177\t }\n1178\t\n1179\t // -----------------------------------------------------------------------\n1180\t // Rule 1 — JWT-shape probe\n1181\t // -----------------------------------------------------------------------\n1182\t\n1183\t #[test]\n1184\t fn jwt_shape_probe_accepts_valid_shape() {\n1185\t assert!(probe_jwt_shape(\"eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiIxMjM0NTY3ODkwIn0.abc123\"));\n1186\t }\n1187\t\n1188\t #[test]\n1189\t fn jwt_shape_probe_rejects_two_parts() {\n1190\t assert!(!probe_jwt_shape(\"part1.part2\"));\n1191\t }\n1192\t\n1193\t #[test]\n1194\t fn jwt_shape_probe_rejects_four_parts() {\n1195\t assert!(!probe_jwt_shape(\"a.b.c.d\"));\n1196\t }\n1197\t\n1198\t #[test]\n1199\t fn jwt_shape_probe_rejects_empty() {\n1200\t assert!(!probe_jwt_shape(\"\"));\n1201\t }\n1202\t\n1203\t #[test]\n1204\t fn jwt_shape_probe_rejects_opaque_token() {\n1205\t assert!(!probe_jwt_shape(\"admin-key-456\"));\n1206\t }\n1207\t\n1208\t #[test]\n1209\t fn jwt_on_non_admin_path_with_no_secret_returns_jwt_invalid() {\n1210\t let state = test_state(); // no JWT secrets configured\n1211\t let jwt = \"eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiIxMjM0NTY3ODkwIn0.abc123\";\n1212\t let verdict = dispatch_bearer(\n1213\t &Method::GET,\n1214\t \"/indexes/products\",\n1215\t Some(jwt),\n1216\t &state,\n1217\t );\n1218\t assert_eq!(verdict, AuthVerdict::JwtInvalid);\n1219\t }\n1220\t\n1221\t #[test]\n1222\t fn jwt_on_admin_path_returns_jwt_invalid() {\n1223\t let state = test_state();\n1224\t let jwt = \"eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiIxMjM0NTY3ODkwIn0.abc123\";\n1225\t let verdict = dispatch_bearer(\n1226\t &Method::GET,\n1227\t \"/_miroir/some/admin/endpoint\",\n1228\t Some(jwt),\n1229\t &state,\n1230\t );\n1231\t assert_eq!(verdict, AuthVerdict::JwtInvalid);\n1232\t }\n1233\t\n1234\t // -----------------------------------------------------------------------\n1235\t // JWT signing and validation — primary secret\n1236\t // -----------------------------------------------------------------------\n1237\t\n1238\t #[test]\n1239\t fn sign_and_validate_primary_jwt() {\n1240\t let state = test_state_with_jwt();\n1241\t let token = state.sign_jwt(\"user1\", \"products\", \"search\", 900).unwrap();\n1242\t\n1243\t let claims = state.validate_jwt(&token).unwrap();\n1244\t assert_eq!(claims.sub, \"user1\");\n1245\t assert_eq!(claims.idx, \"products\");\n1246\t assert_eq!(claims.scope, \"search\");\n1247\t }\n1248\t\n1249\t #[test]\n1250\t fn signed_jwt_authenticates_via_dispatch() {\n1251\t let state = test_state_with_jwt();\n1252\t let token = state.sign_jwt(\"user1\", \"products\", \"search\", 900).unwrap();\n1253\t\n1254\t let verdict = dispatch_bearer(\n1255\t &Method::GET,\n1256\t \"/indexes/products\",\n1257\t Some(&token),\n1258\t &state,\n1259\t );\n1260\t assert_eq!(verdict, AuthVerdict::Authenticated(TokenKind::Jwt));\n1261\t }\n1262\t\n1263\t #[test]\n1264\t fn expired_jwt_returns_jwt_invalid() {\n1265\t let state = test_state_with_jwt();\n1266\t let now = epoch_seconds();\n1267\t let claims = JwtClaims {\n1268\t sub: \"user1\".to_string(),\n1269\t idx: \"products\".to_string(),\n1270\t scope: \"search\".to_string(),\n1271\t iat: now - 3600,\n1272\t exp: now - 100, // expired well beyond 30s leeway\n1273\t };\n1274\t let header = JwtHeader {\n1275\t alg: \"HS256\".to_string(),\n1276\t kid: KID_PRIMARY.to_string(),\n1277\t typ: \"JWT\".to_string(),\n1278\t };\n1279\t let token = jwt_encode(\n1280\t &header,\n1281\t &claims,\n1282\t state.jwt_primary.as_ref().unwrap().as_bytes(),\n1283\t )\n1284\t .unwrap();\n1285\t\n1286\t let result = state.validate_jwt(&token);\n1287\t assert_eq!(result, Err(JwtValidationError::Expired));\n1288\t }\n1289\t\n1290\t #[test]\n1291\t fn tampered_signature_returns_invalid_signature() {\n1292\t let state = test_state_with_jwt();\n1293\t let mut token = state.sign_jwt(\"user1\", \"products\", \"search\", 900).unwrap();\n1294\t // Tamper with the signature\n1295\t let parts: Vec<&str> = token.split('.').collect();\n1296\t token = format!(\"{}.{}.tampered_sig\", parts[0], parts[1]);\n1297\t\n1298\t let result = state.validate_jwt(&token);\n1299\t assert_eq!(result, Err(JwtValidationError::InvalidSignature));\n1300\t }\n1301\t\n1302\t // -----------------------------------------------------------------------\n1303\t // JWT dual-secret rotation validation\n1304\t // -----------------------------------------------------------------------\n1305\t\n1306\t #[test]\n1307\t fn rotation_old_token_validates_via_previous_secret() {\n1308\t let primary = \"test-secret-primary-key-32byte\";\n1309\t let previous = \"test-secret-previous-key-32byte\";\n1310\t\n1311\t // Sign token with the previous secret\n1312\t let now = epoch_seconds();\n1313\t let claims = JwtClaims {\n1314\t sub: \"user1\".to_string(),\n1315\t idx: \"products\".to_string(),\n1316\t scope: \"search\".to_string(),\n1317\t iat: now,\n1318\t exp: now + 900,\n1319\t };\n1320\t let header = JwtHeader {\n1321\t alg: \"HS256\".to_string(),\n1322\t kid: KID_PREVIOUS.to_string(),\n1323\t typ: \"JWT\".to_string(),\n1324\t };\n1325\t let old_token = jwt_encode(&header, &claims, previous.as_bytes()).unwrap();\n1326\t\n1327\t // Simulate rotation — new primary, old primary as previous\n1328\t let state = AuthState {\n1329\t master_key: \"m\".to_string(),\n1330\t admin_key: \"a\".to_string(),\n1331\t jwt_primary: Some(primary.to_string()),\n1332\t jwt_previous: Some(previous.to_string()),\n1333\t seal_key: test_key(),\n1334\t revoked_sessions: Arc::new(DashMap::new()),\n1335\t admin_session_revoked_total: Counter::with_opts(\n1336\t prometheus::Opts::new(\"test_revoked_total\", \"test\")\n1337\t ).unwrap(),\n1338\t };\n1339\t\n1340\t // Old token should still validate via previous secret\n1341\t let validated = state.validate_jwt(&old_token).unwrap();\n1342\t assert_eq!(validated.sub, \"user1\");\n1343\t\n1344\t // And dispatch should authenticate it\n1345\t let verdict = dispatch_bearer(\n1346\t &Method::GET,\n1347\t \"/indexes/products\",\n1348\t Some(&old_token),\n1349\t &state,\n1350\t );\n1351\t assert_eq!(verdict, AuthVerdict::Authenticated(TokenKind::Jwt));\n1352\t }\n1353\t\n1354\t #[test]\n1355\t fn rotation_new_token_validates_via_primary_secret() {\n1356\t let state = test_state_with_dual_jwt();\n1357\t let new_token = state.sign_jwt(\"user2\", \"orders\", \"search\", 900).unwrap();\n1358\t\n1359\t let validated = state.validate_jwt(&new_token).unwrap();\n1360\t assert_eq!(validated.sub, \"user2\");\n1361\t assert_eq!(validated.idx, \"orders\");\n1362\t }\n1363\t\n1364\t #[test]\n1365\t fn rotation_wrong_secret_returns_invalid_signature() {\n1366\t let state = AuthState {\n1367\t master_key: \"m\".to_string(),\n1368\t admin_key: \"a\".to_string(),\n1369\t jwt_primary: Some(\"correct-secret-key-32bytes-long!!!\".to_string()),\n1370\t jwt_previous: Some(\"previous-secret-key-32bytes-long!!\".to_string()),\n1371\t seal_key: test_key(),\n1372\t revoked_sessions: Arc::new(DashMap::new()),\n1373\t admin_session_revoked_total: Counter::with_opts(\n1374\t prometheus::Opts::new(\"test_revoked_total\", \"test\")\n1375\t ).unwrap(),\n1376\t };\n1377\t\n1378\t // Token signed with a completely different secret\n1379\t let now = epoch_seconds();\n1380\t let claims = JwtClaims {\n1381\t sub: \"user1\".to_string(),\n1382\t idx: \"products\".to_string(),\n1383\t scope: \"search\".to_string(),\n1384\t iat: now,\n1385\t exp: now + 900,\n1386\t };\n1387\t let header = JwtHeader {\n1388\t alg: \"HS256\".to_string(),\n1389\t kid: KID_PRIMARY.to_string(),\n1390\t typ: \"JWT\".to_string(),\n1391\t };\n1392\t let token = jwt_encode(\n1393\t &header,\n1394\t &claims,\n1395\t \"wrong-secret-key-32bytes-long!!!!\".as_bytes(),\n1396\t )\n1397\t .unwrap();\n1398\t\n1399\t let result = state.validate_jwt(&token);\n1400\t assert_eq!(result, Err(JwtValidationError::InvalidSignature));\n1401\t }\n1402\t\n1403\t #[test]\n1404\t fn leak_response_empty_previous_rejects_old_tokens() {\n1405\t let state = AuthState {\n1406\t master_key: \"m\".to_string(),\n1407\t admin_key: \"a\".to_string(),\n1408\t jwt_primary: Some(\"new-primary-secret-key-32bytes!!\".to_string()),\n1409\t jwt_previous: Some(String::new()), // empty = leak response\n1410\t seal_key: test_key(),\n1411\t revoked_sessions: Arc::new(DashMap::new()),\n1412\t admin_session_revoked_total: Counter::with_opts(\n1413\t prometheus::Opts::new(\"test_revoked_total\", \"test\")\n1414\t ).unwrap(),\n1415\t };\n1416\t\n1417\t let result = state.validate_jwt(\"eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJ0ZXN0In0.fake\");\n1418\t assert_eq!(result, Err(JwtValidationError::PreviousSecretEmpty));\n1419\t }\n1420\t\n1421\t #[test]\n1422\t fn rotation_after_step5_steady_state_previous_removed() {\n1423\t let primary = \"final-primary-secret-key-32bytes\";\n1424\t let state = AuthState {\n1425\t master_key: \"m\".to_string(),\n1426\t admin_key: \"a\".to_string(),\n1427\t jwt_primary: Some(primary.to_string()),\n1428\t jwt_previous: None,\n1429\t seal_key: test_key(),\n1430\t revoked_sessions: Arc::new(DashMap::new()),\n1431\t admin_session_revoked_total: Counter::with_opts(\n1432\t prometheus::Opts::new(\"test_revoked_total\", \"test\")\n1433\t ).unwrap(),\n1434\t };\n1435\t\n1436\t // Tokens signed with current primary work\n1437\t let token = state.sign_jwt(\"user1\", \"products\", \"search\", 900).unwrap();\n1438\t assert!(state.validate_jwt(&token).is_ok());\n1439\t\n1440\t // Old tokens signed with now-removed previous fail\n1441\t let old_claims = JwtClaims {\n1442\t sub: \"user1\".to_string(),\n1443\t idx: \"products\".to_string(),\n1444\t scope: \"search\".to_string(),\n1445\t iat: epoch_seconds() - 100,\n1446\t exp: epoch_seconds() + 800,\n1447\t };\n1448\t let old_header = JwtHeader {\n1449\t alg: \"HS256\".to_string(),\n1450\t kid: KID_PREVIOUS.to_string(),\n1451\t typ: \"JWT\".to_string(),\n1452\t };\n1453\t let old_token = jwt_encode(\n1454\t &old_header,\n1455\t &old_claims,\n1456\t \"old-previous-secret-now-removed\".as_bytes(),\n1457\t )\n1458\t .unwrap();\n1459\t assert!(state.validate_jwt(&old_token).is_err());\n1460\t }\n1461\t\n1462\t // -----------------------------------------------------------------------\n1463\t // End-to-end rotation scenario\n1464\t // -----------------------------------------------------------------------\n1465\t\n1466\t #[test]\n1467\t fn full_rotation_e2e() {\n1468\t let secret_v1 = \"version-1-secret-key-32bytes-long!\";\n1469\t let secret_v2 = \"version-2-secret-key-32bytes-long!\";\n1470\t\n1471\t // Pre-rotation: only v1\n1472\t let pre = AuthState {\n1473\t master_key: \"m\".into(),\n1474\t admin_key: \"a\".into(),\n1475\t jwt_primary: Some(secret_v1.into()),\n1476\t jwt_previous: None,\n1477\t seal_key: test_key(),\n1478\t revoked_sessions: Arc::new(DashMap::new()),\n1479\t admin_session_revoked_total: Counter::with_opts(\n1480\t prometheus::Opts::new(\"test_revoked_total\", \"test\")\n1481\t ).unwrap(),\n1482\t };\n1483\t let token_v1 = pre.sign_jwt(\"alice\", \"idx\", \"search\", 900).unwrap();\n1484\t assert!(pre.validate_jwt(&token_v1).is_ok());\n1485\t\n1486\t // During rotation: v2 primary, v1 previous\n1487\t let during = AuthState {\n1488\t master_key: \"m\".into(),\n1489\t admin_key: \"a\".into(),\n1490\t jwt_primary: Some(secret_v2.into()),\n1491\t jwt_previous: Some(secret_v1.into()),\n1492\t seal_key: test_key(),\n1493\t revoked_sessions: Arc::new(DashMap::new()),\n1494\t admin_session_revoked_total: Counter::with_opts(\n1495\t prometheus::Opts::new(\"test_revoked_total\", \"test\")\n1496\t ).unwrap(),\n1497\t };\n1498\t // Old token still validates\n1499\t assert!(during.validate_jwt(&token_v1).is_ok());\n1500\t // New tokens work too\n1501\t let token_v2 = during.sign_jwt(\"bob\", \"idx\", \"search\", 900).unwrap();\n1502\t assert!(during.validate_jwt(&token_v2).is_ok());\n1503\t\n1504\t // Post-rotation: only v2\n1505\t let post = AuthState {\n1506\t master_key: \"m\".into(),\n1507\t admin_key: \"a\".into(),\n1508\t jwt_primary: Some(secret_v2.into()),\n1509\t jwt_previous: None,\n1510\t seal_key: test_key(),\n1511\t revoked_sessions: Arc::new(DashMap::new()),\n1512\t admin_session_revoked_total: Counter::with_opts(\n1513\t prometheus::Opts::new(\"test_revoked_total\", \"test\")\n1514\t ).unwrap(),\n1515\t };\n1516\t // New token still works\n1517\t assert!(post.validate_jwt(&token_v2).is_ok());\n1518\t // Old token is rejected (signed with v1, no previous loaded)\n1519\t assert!(post.validate_jwt(&token_v1).is_err());\n1520\t }\n1521\t\n1522\t // -----------------------------------------------------------------------\n1523\t // Rule 2 — admin-path opaque-token match (admin_key only)\n1524\t // -----------------------------------------------------------------------\n1525\t\n1526\t #[test]\n1527\t fn admin_path_matches_admin_key() {\n1528\t let state = test_state();\n1529\t let verdict = dispatch_bearer(\n1530\t &Method::GET,\n1531\t \"/_miroir/some/endpoint\",\n1532\t Some(\"admin-key-456\"),\n1533\t &state,\n1534\t );\n1535\t assert_eq!(verdict, AuthVerdict::Authenticated(TokenKind::AdminKey));\n1536\t }\n1537\t\n1538\t #[test]\n1539\t fn admin_path_rejects_master_key() {\n1540\t let state = test_state();\n1541\t let verdict = dispatch_bearer(\n1542\t &Method::GET,\n1543\t \"/_miroir/some/endpoint\",\n1544\t Some(\"master-key-123\"),\n1545\t &state,\n1546\t );\n1547\t assert_eq!(verdict, AuthVerdict::InvalidAuth);\n1548\t }\n1549\t\n1550\t #[test]\n1551\t fn admin_path_rejects_wrong_key() {\n1552\t let state = test_state();\n1553\t let verdict = dispatch_bearer(\n1554\t &Method::GET,\n1555\t \"/_miroir/some/endpoint\",\n1556\t Some(\"wrong-key\"),\n1557\t &state,\n1558\t );\n1559\t assert_eq!(verdict, AuthVerdict::InvalidAuth);\n1560\t }\n1561\t\n1562\t #[test]\n1563\t fn admin_path_rejects_missing_auth() {\n1564\t let state = test_state();\n1565\t let verdict = dispatch_bearer(\n1566\t &Method::GET,\n1567\t \"/_miroir/some/endpoint\",\n1568\t None,\n1569\t &state,\n1570\t );\n1571\t assert_eq!(verdict, AuthVerdict::InvalidAuth);\n1572\t }\n1573\t\n1574\t // -----------------------------------------------------------------------\n1575\t // Rule 3 — master-key match (non-admin paths only)\n1576\t // -----------------------------------------------------------------------\n1577\t\n1578\t #[test]\n1579\t fn non_admin_path_matches_master_key() {\n1580\t let state = test_state();\n1581\t let verdict = dispatch_bearer(\n1582\t &Method::POST,\n1583\t \"/indexes/products/documents\",\n1584\t Some(\"master-key-123\"),\n1585\t &state,\n1586\t );\n1587\t assert_eq!(verdict, AuthVerdict::Authenticated(TokenKind::MasterKey));\n1588\t }\n1589\t\n1590\t #[test]\n1591\t fn non_admin_path_rejects_admin_key() {\n1592\t let state = test_state();\n1593\t let verdict = dispatch_bearer(\n1594\t &Method::POST,\n1595\t \"/indexes/products/documents\",\n1596\t Some(\"admin-key-456\"),\n1597\t &state,\n1598\t );\n1599\t assert_eq!(verdict, AuthVerdict::InvalidAuth);\n1600\t }\n1601\t\n1602\t #[test]\n1603\t fn non_admin_path_rejects_wrong_key() {\n1604\t let state = test_state();\n1605\t let verdict = dispatch_bearer(\n1606\t &Method::POST,\n1607\t \"/indexes/products/documents\",\n1608\t Some(\"wrong-key\"),\n1609\t &state,\n1610\t );\n1611\t assert_eq!(verdict, AuthVerdict::InvalidAuth);\n1612\t }\n1613\t\n1614\t #[test]\n1615\t fn non_admin_path_rejects_missing_auth() {\n1616\t let state = test_state();\n1617\t let verdict = dispatch_bearer(\n1618\t &Method::POST,\n1619\t \"/indexes/products/documents\",\n1620\t None,\n1621\t &state,\n1622\t );\n1623\t assert_eq!(verdict, AuthVerdict::InvalidAuth);\n1624\t }\n1625\t\n1626\t // -----------------------------------------------------------------------\n1627\t // Rule 4 — missing auth → 401 miroir_invalid_auth\n1628\t // -----------------------------------------------------------------------\n1629\t\n1630\t #[test]\n1631\t fn missing_auth_on_gated_endpoint_returns_invalid_auth() {\n1632\t let state = test_state();\n1633\t let verdict = dispatch_bearer(\n1634\t &Method::POST,\n1635\t \"/indexes\",\n1636\t None,\n1637\t &state,\n1638\t );\n1639\t assert_eq!(verdict, AuthVerdict::InvalidAuth);\n1640\t }\n1641\t\n1642\t // -----------------------------------------------------------------------\n1643\t // X-Admin-Key short-circuit\n1644\t // -----------------------------------------------------------------------\n1645\t\n1646\t #[test]\n1647\t fn x_admin_key_matches_admin_key() {\n1648\t let mut headers = HeaderMap::new();\n1649\t headers.insert(\"X-Admin-Key\", \"admin-key-456\".parse().unwrap());\n1650\t assert!(check_x_admin_key(&headers, b\"admin-key-456\"));\n1651\t }\n1652\t\n1653\t #[test]\n1654\t fn x_admin_key_rejects_wrong_key() {\n1655\t let mut headers = HeaderMap::new();\n1656\t headers.insert(\"X-Admin-Key\", \"wrong-key\".parse().unwrap());\n1657\t assert!(!check_x_admin_key(&headers, b\"admin-key-456\"));\n1658\t }\n1659\t\n1660\t #[test]\n1661\t fn x_admin_key_missing_header() {\n1662\t let headers = HeaderMap::new();\n1663\t assert!(!check_x_admin_key(&headers, b\"admin-key-456\"));\n1664\t }\n1665\t\n1666\t // -----------------------------------------------------------------------\n1667\t // Constant-time comparison\n1668\t // -----------------------------------------------------------------------\n1669\t\n1670\t #[test]\n1671\t fn constant_time_eq_matching() {\n1672\t assert!(constant_time_compare(b\"hello\", b\"hello\"));\n1673\t }\n1674\t\n1675\t #[test]\n1676\t fn constant_time_eq_not_matching() {\n1677\t assert!(!constant_time_compare(b\"hello\", b\"world\"));\n1678\t }\n1679\t\n1680\t #[test]\n1681\t fn constant_time_eq_different_lengths() {\n1682\t assert!(!constant_time_compare(b\"short\", b\"much-longer-value\"));\n1683\t }\n1684\t\n1685\t #[test]\n1686\t fn constant_time_eq_empty() {\n1687\t assert!(constant_time_compare(b\"\", b\"\"));\n1688\t }\n1689\t\n1690\t /// Timing-injection harness: verify no measurable delta between\n1691\t /// \"all bytes wrong\" and \"one byte wrong\" comparisons at the same length.\n1692\t #[test]\n1693\t fn constant_time_no_timing_leak() {\n1694\t use std::time::Instant;\n1695\t\n1696\t let expected = b\"admin-key-456\";\n1697\t let all_wrong = b\"xxxxxxxxxxxxx\";\n1698\t let one_wrong = b\"admin-key-457\";\n1699\t\n1700\t let iterations = 100_000u64;\n1701\t\n1702\t let start = Instant::now();\n1703\t for _ in 0..iterations {\n1704\t let _ = constant_time_compare(all_wrong, expected);\n1705\t }\n1706\t let all_wrong_duration = start.elapsed();\n1707\t\n1708\t let start = Instant::now();\n1709\t for _ in 0..iterations {\n1710\t let _ = constant_time_compare(one_wrong, expected);\n1711\t }\n1712\t let one_wrong_duration = start.elapsed();\n1713\t\n1714\t let ratio = all_wrong_duration.as_secs_f64() / one_wrong_duration.as_secs_f64();\n1715\t assert!(\n1716\t ratio > 0.5 && ratio < 2.0,\n1717\t \"Timing ratio {} suggests non-constant-time comparison: all_wrong={:?}, one_wrong={:?}\",\n1718\t ratio,\n1719\t all_wrong_duration,\n1720\t one_wrong_duration,\n1721\t );\n1722\t }\n1723\t\n1724\t // -----------------------------------------------------------------------\n1725\t // Bearer extraction\n1726\t // -----------------------------------------------------------------------\n1727\t\n1728\t #[test]\n1729\t fn extract_bearer_valid() {\n1730\t let mut headers = HeaderMap::new();\n1731\t headers.insert(\"authorization\", \"Bearer my-token\".parse().unwrap());\n1732\t assert_eq!(extract_bearer(&headers), Some(\"my-token\"));\n1733\t }\n1734\t\n1735\t #[test]\n1736\t fn extract_bearer_missing_header() {\n1737\t let headers = HeaderMap::new();\n1738\t assert_eq!(extract_bearer(&headers), None);\n1739\t }\n1740\t\n1741\t #[test]\n1742\t fn extract_bearer_wrong_scheme() {\n1743\t let mut headers = HeaderMap::new();\n1744\t headers.insert(\"authorization\", \"Basic dXNlcjpwYXNz\".parse().unwrap());\n1745\t assert_eq!(extract_bearer(&headers), None);\n1746\t }\n1747\t\n1748\t // -----------------------------------------------------------------------\n1749\t // Admin path detection\n1750\t // -----------------------------------------------------------------------\n1751\t\n1752\t #[test]\n1753\t fn admin_path_detected() {\n1754\t assert!(is_admin_path(\"/_miroir/metrics\"));\n1755\t assert!(is_admin_path(\"/_miroir/admin/login\"));\n1756\t assert!(is_admin_path(\"/_miroir/ui/search/locale/en\"));\n1757\t }\n1758\t\n1759\t #[test]\n1760\t fn non_admin_path_not_detected() {\n1761\t assert!(!is_admin_path(\"/indexes/products\"));\n1762\t assert!(!is_admin_path(\"/search/products\"));\n1763\t assert!(!is_admin_path(\"/health\"));\n1764\t }\n1765\t\n1766\t // -----------------------------------------------------------------------\n1767\t // Rate limiter stub\n1768\t // -----------------------------------------------------------------------\n1769\t\n1770\t #[test]\n1771\t fn rate_limiter_always_allows() {\n1772\t let limiter = RateLimiter;\n1773\t assert!(limiter.check(&RateLimitBucket::AdminLogin(\"127.0.0.1\".into())).is_ok());\n1774\t assert!(limiter.check(&RateLimitBucket::SearchUi(\"10.0.0.1\".into())).is_ok());\n1775\t }\n1776\t\n1777\t // -----------------------------------------------------------------------\n1778\t // AuthVerdict helpers\n1779\t // -----------------------------------------------------------------------\n1780\t\n1781\t #[test]\n1782\t fn verdict_is_allowed() {\n1783\t assert!(AuthVerdict::Exempt.is_allowed());\n1784\t assert!(AuthVerdict::Authenticated(TokenKind::MasterKey).is_allowed());\n1785\t assert!(AuthVerdict::Authenticated(TokenKind::AdminKey).is_allowed());\n1786\t assert!(!AuthVerdict::JwtInvalid.is_allowed());\n1787\t assert!(!AuthVerdict::JwtScopeDenied.is_allowed());\n1788\t assert!(!AuthVerdict::InvalidAuth.is_allowed());\n1789\t }\n1790\t\n1791\t // -----------------------------------------------------------------------\n1792\t // Integration-style: all exempt endpoints have test coverage\n1793\t // -----------------------------------------------------------------------\n1794\t\n1795\t #[test]\n1796\t fn all_rule5_exempt_endpoints_covered() {\n1797\t let cases = vec![\n1798\t (Method::GET, \"/_miroir/ui/search/locale/en-US\"),\n1799\t (Method::GET, \"/_miroir/ui/search/locale/fr\"),\n1800\t (Method::POST, \"/_miroir/admin/login\"),\n1801\t (Method::GET, \"/_miroir/ui/search/products/session\"),\n1802\t (Method::GET, \"/_miroir/ui/search/users/session\"),\n1803\t (Method::GET, \"/ui/search/products\"),\n1804\t (Method::GET, \"/ui/search/users\"),\n1805\t ];\n1806\t for (method, path) in cases {\n1807\t assert!(\n1808\t is_dispatch_exempt(&method, path),\n1809\t \"Expected ({}, {}) to be dispatch-exempt\",\n1810\t method,\n1811\t path,\n1812\t );\n1813\t }\n1814\t 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Topology management: node registry, groups, health state, and state machine.\n2\t\n3\tuse crate::error::{MiroirError, Result};\n4\tuse serde::{Deserialize, Deserializer, Serialize, Serializer};\n5\tuse std::collections::HashMap;\n6\tuse std::time::Instant;\n7\t\n8\t/// Unique identifier for a node.\n9\t#[derive(Debug, Clone, Hash, PartialEq, Eq, Serialize, Deserialize)]\n10\tpub struct NodeId(String);\n11\t\n12\timpl NodeId {\n13\t pub fn new(id: String) -> Self {\n14\t Self(id)\n15\t }\n16\t\n17\t pub fn as_str(&self) -> &str {\n18\t &self.0\n19\t }\n20\t}\n21\t\n22\timpl From for NodeId {\n23\t fn from(s: String) -> Self {\n24\t Self(s)\n25\t }\n26\t}\n27\t\n28\timpl AsRef for NodeId {\n29\t fn as_ref(&self) -> &str {\n30\t &self.0\n31\t }\n32\t}\n33\t\n34\timpl std::fmt::Display for NodeId {\n35\t fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {\n36\t self.0.fmt(f)\n37\t }\n38\t}\n39\t\n40\t/// Health status of a node, with state-machine transitions.\n41\t#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]\n42\t#[serde(rename_all = \"snake_case\")]\n43\tpub enum NodeStatus {\n44\t /// Node is healthy and serving traffic.\n45\t #[default]\n46\t Healthy,\n47\t /// Node is degraded (timeouts, not full disconnect) but still serving.\n48\t Degraded,\n49\t /// Node is draining — graceful shutdown, still serves shards it owns.\n50\t Draining,\n51\t /// Node has failed (unplanned outage).\n52\t Failed,\n53\t /// Node is joining the cluster (being provisioned).\n54\t Joining,\n55\t /// Node is active — fully operational after joining.\n56\t Active,\n57\t /// Node has been removed from the cluster.\n58\t Removed,\n59\t}\n60\t\n61\timpl NodeStatus {\n62\t /// Attempt a state transition. Returns the new status on success.\n63\t ///\n64\t /// Legal transitions (plan §2 topology-change verbs):\n65\t /// - (new) → Joining (admin API: POST /_miroir/nodes)\n66\t /// - Joining → Active (migration complete)\n67\t /// - Active → Draining (admin API: POST /_miroir/nodes/{id}/drain)\n68\t /// - Draining → Removed (migration complete)\n69\t /// - Active/Draining → Failed (health check detects failure)\n70\t /// - Failed → Active (health check recovery)\n71\t /// - Active/Failed → Degraded (partial health: timeouts)\n72\t /// - Degraded → Active (health restored)\n73\t pub fn transition_to(self, target: NodeStatus) -> Result {\n74\t use NodeStatus::*;\n75\t\n76\t let legal = match (self, target) {\n77\t // Normal lifecycle\n78\t (Joining, Active) => true,\n79\t (Active, Draining) => true,\n80\t (Draining, Removed) => true,\n81\t\n82\t // Failure detection\n83\t (Active, Failed) => true,\n84\t (Draining, Failed) => true,\n85\t\n86\t // Recovery\n87\t (Failed, Active) => true,\n88\t\n89\t // Degraded\n90\t (Active, Degraded) => true,\n91\t (Failed, Degraded) => true,\n92\t (Degraded, Active) => true,\n93\t\n94\t // Idempotent\n95\t (Active, Active)\n96\t | (Failed, Failed)\n97\t | (Degraded, Degraded)\n98\t | (Joining, Joining)\n99\t | (Draining, Draining) => true,\n100\t"}]},"parent_tool_use_id":"call_fbc4ae069de4433aa2e41c0c","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"aadc920b-f122-4753-bf7a-3884a32437f6","timestamp":"2026-05-23T06:23:17.477Z"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_41853150a7044779866eeaeb","type":"tool_result","content":"1\t//! Scatter orchestration: fan-out logic and covering set builder.\n2\t\n3\tuse crate::config::UnavailableShardPolicy;\n4\tuse tracing::{instrument, info_span, Instrument};\n5\tuse crate::merger::{MergeInput, MergedSearchResult, MergeStrategy, ShardHitPage};\n6\tuse crate::router::{covering_set, covering_set_with_version_floor, query_group};\n7\tuse crate::topology::{NodeId, Topology};\n8\tuse crate::Result;\n9\tuse serde::{Deserialize, Serialize};\n10\tuse serde_json::Value;\n11\tuse std::collections::HashMap;\n12\t\n13\t/// Scatter plan: the exact shard→node mapping for a search query.\n14\t#[derive(Debug, Clone)]\n15\tpub struct ScatterPlan {\n16\t pub chosen_group: u32,\n17\t pub target_shards: Vec,\n18\t pub shard_to_node: HashMap,\n19\t pub deadline_ms: u32,\n20\t pub hedging_eligible: bool,\n21\t}\n22\t\n23\t// ---------------------------------------------------------------------------\n24\t// §15 OP#4: Global-IDF preflight (dfs_query_then_fetch pattern)\n25\t// ---------------------------------------------------------------------------\n26\t\n27\t/// Per-term document frequency from a single shard.\n28\t#[derive(Debug, Clone, Serialize, Deserialize)]\n29\tpub struct TermStats {\n30\t pub df: u64,\n31\t}\n32\t\n33\t/// Preflight request: gather term-frequency statistics from a shard.\n34\t#[derive(Debug, Clone, Serialize, Deserialize)]\n35\tpub struct PreflightRequest {\n36\t pub index_uid: String,\n37\t pub terms: Vec,\n38\t pub filter: Option,\n39\t}\n40\t\n41\t/// Response from a shard's preflight query.\n42\t#[derive(Debug, Clone, Serialize, Deserialize)]\n43\tpub struct PreflightResponse {\n44\t pub total_docs: u64,\n45\t pub avg_doc_length: f64,\n46\t pub term_stats: HashMap,\n47\t}\n48\t\n49\t/// Aggregated global term statistics after coordinator aggregation.\n50\t#[derive(Debug, Clone, Serialize, Deserialize)]\n51\tpub struct GlobalTermStats {\n52\t pub df: u64,\n53\t pub idf: f64,\n54\t}\n55\t\n56\t/// Aggregated global IDF data computed at the coordinator.\n57\t#[derive(Debug, Clone, Serialize, Deserialize)]\n58\tpub struct GlobalIdf {\n59\t pub total_docs: u64,\n60\t pub avg_doc_length: f64,\n61\t pub terms: HashMap,\n62\t}\n63\t\n64\timpl GlobalIdf {\n65\t /// Aggregate per-shard preflight responses into global IDF.\n66\t pub fn from_preflight_responses(responses: &[PreflightResponse]) -> Self {\n67\t let mut total_docs = 0u64;\n68\t let mut total_length = 0.0f64;\n69\t let mut term_df: HashMap = HashMap::new();\n70\t\n71\t for resp in responses {\n72\t total_docs += resp.total_docs;\n73\t total_length += resp.avg_doc_length * resp.total_docs as f64;\n74\t for (term, stats) in &resp.term_stats {\n75\t *term_df.entry(term.clone()).or_insert(0) += stats.df;\n76\t }\n77\t }\n78\t\n79\t let avg_doc_length = if total_docs > 0 {\n80\t total_length / total_docs as f64\n81\t } else {\n82\t 0.0\n83\t };\n84\t\n85\t let n = total_docs as f64;\n86\t let terms = term_df\n87\t .into_iter()\n88\t .map(|(term, df)| {\n89\t let idf = if df == 0 {\n90\t 0.0\n91\t } else {\n92\t ((n - df as f64 + 0.5) / (df as f64 + 0.5)).ln() + 1.0\n93\t };\n94\t (term, GlobalTermStats { df, idf })\n95\t })\n96\t .collect();\n97\t\n98\t Self { total_docs, avg_doc_length, terms }\n99\t }\n100\t}"}]},"parent_tool_use_id":"call_fbc4ae069de4433aa2e41c0c","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"c9a830e1-0b88-4766-94c6-b17136e7bbcd","timestamp":"2026-05-23T06:23:17.478Z"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_90955fe74e4b4f3c8c2289e8","type":"tool_result","content":"1\t//! Cluster rebalancer for elastic topology operations.\n2\t//!\n3\t//! Implements plan §2 topology changes and §4 rebalancer:\n4\t//! - Node addition (within a group)\n5\t//! - Replica-group addition\n6\t//! - Node removal (drain)\n7\t//! - Group removal\n8\t//! - Unplanned node failure handling\n9\t//!\n10\t//! The rebalancer coordinates shard migrations using the migration coordinator\n11\t//! and provides admin API endpoints for topology operations.\n12\t\n13\tuse crate::migration::{MigrationCoordinator, MigrationId, MigrationConfig, MigrationError, NodeId as MigrationNodeId, ShardId};\n14\tuse crate::task_store::TaskStore;\n15\tuse crate::topology::{Node, NodeId as TopologyNodeId, NodeStatus, Topology};\n16\tuse crate::router::{assign_shard_in_group, score};\n17\tuse serde::{Deserialize, Serialize};\n18\tuse std::collections::HashMap;\n19\tuse std::sync::Arc;\n20\tuse std::time::{Duration, Instant};\n21\tuse tokio::sync::RwLock;\n22\tuse tracing::{debug, error, info, instrument, warn};\n23\t\n24\t/// Callback type for recording rebalancer metrics.\n25\tpub type RebalancerMetricsCallback = Arc;\n26\t\n27\t/// Convert a topology NodeId to a migration NodeId.\n28\tfn topo_to_migration_node_id(id: &TopologyNodeId) -> MigrationNodeId {\n29\t MigrationNodeId(id.as_str().to_string())\n30\t}\n31\t\n32\t/// Convert a migration NodeId to a topology NodeId.\n33\tfn migration_to_topo_node_id(id: &MigrationNodeId) -> TopologyNodeId {\n34\t TopologyNodeId::new(id.0.clone())\n35\t}\n36\t\n37\t/// Configuration for the rebalancer.\n38\t#[derive(Debug, Clone, Serialize, Deserialize)]\n39\tpub struct RebalancerConfig {\n40\t /// Maximum concurrent shard migrations.\n41\t pub max_concurrent_migrations: u32,\n42\t /// Timeout for a single migration operation.\n43\t pub migration_timeout_s: u64,\n44\t /// Whether to automatically rebalance on node recovery.\n45\t pub auto_rebalance_on_recovery: bool,\n46\t /// Batch size for document migration.\n47\t pub migration_batch_size: u32,\n48\t /// Delay between migration batches (ms).\n49\t pub migration_batch_delay_ms: u64,\n50\t}\n51\t\n52\timpl Default for RebalancerConfig {\n53\t fn default() -> Self {\n54\t Self {\n55\t max_concurrent_migrations: 4,\n56\t migration_timeout_s: 3600,\n57\t auto_rebalance_on_recovery: true,\n58\t migration_batch_size: 1000,\n59\t migration_batch_delay_ms: 100,\n60\t }\n61\t }\n62\t}\n63\t\n64\t/// Type of topology operation.\n65\t#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]\n66\t#[serde(rename_all = \"snake_case\")]\n67\tpub enum TopologyOperationType {\n68\t /// Adding a new node to an existing replica group.\n69\t AddNode,\n70\t /// Removing a node from a replica group.\n71\t RemoveNode,\n72\t /// Draining a node before removal.\n73\t DrainNode,\n74\t /// Adding a new replica group.\n75\t AddReplicaGroup,\n76\t /// Removing an entire replica group.\n77\t RemoveReplicaGroup,\n78\t /// Handling a failed node.\n79\t NodeFailure,\n80\t}\n81\t\n82\t/// Status of a topology operation.\n83\t#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]\n84\t#[serde(rename_all = \"snake_case\")]\n85\tpub enum TopologyOperationStatus {\n86\t /// Operation is pending.\n87\t Pending,\n88\t /// Operation is in progress.\n89\t InProgress,\n90\t /// Operation completed successfully.\n91\t Complete,\n92\t /// Operation failed.\n93\t Failed,\n94\t /// Operation was cancelled.\n95\t Cancelled,\n96\t}\n97\t\n98\t/// A topology operation (node/group add/remove/drain).\n99\t#[derive(Debug, Clone, Serialize, Deserialize)]\n100\tpub struct TopologyOperation {"}]},"parent_tool_use_id":"call_fbc4ae069de4433aa2e41c0c","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"5f5fc803-f2e6-4eeb-b8aa-01f32aa0d4a1","timestamp":"2026-05-23T06:23:17.479Z"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_e1a8a35dfc5d4c3284784a15","type":"tool_result","content":"crates/miroir-core/src/config.bak/mod.rs:180:pub struct HealthConfig {\ncrates/miroir-core/src/config.rs:234:pub struct HealthConfig {\ncrates/miroir-core/src/topology.rs:183: pub fn is_healthy(&self) -> bool {\ncrates/miroir-core/src/topology.rs:239: pub fn healthy_nodes<'a>(&self, node_map: &'a HashMap) -> Vec<&'a Node> {\ncrates/miroir-core/src/topology.rs:748: fn healthy_nodes_returns_only_active_nodes() {\ncrates/miroir-core/src/topology.rs:770: fn healthy_nodes_includes_degraded() {\ncrates/miroir-core/src/topology.rs:850: fn node_is_healthy_covers_all_statuses() {"}]},"parent_tool_use_id":"call_fbc4ae069de4433aa2e41c0c","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"1550b5e0-c7ff-4b00-b4c3-8a1410f6f84a","timestamp":"2026-05-23T06:23:17.490Z"} +{"type":"system","subtype":"task_progress","task_id":"af072207fd7dde702","tool_use_id":"call_fbc4ae069de4433aa2e41c0c","description":"Reading crates/miroir-proxy/src/routes/admin.rs","usage":{"total_tokens":0,"tool_uses":18,"duration_ms":32013},"last_tool_name":"Read","uuid":"118de181-20fc-44ec-ab33-d86325c48214","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379"} 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+{"type":"assistant","message":{"id":"msg_20260523142320b168e93344ed4dd9","type":"message","role":"assistant","model":"glm-4.7","content":[{"type":"tool_use","id":"call_3daae31811134342b28c40d8","name":"Read","input":{"file_path":"/home/coding/miroir/crates/miroir-proxy/src/routes/admin_endpoints.rs","limit":100}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":"call_fbc4ae069de4433aa2e41c0c","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"1c231a0e-c7e5-4a58-ba03-837498bc8cb5"} +{"type":"system","subtype":"task_progress","task_id":"af072207fd7dde702","tool_use_id":"call_fbc4ae069de4433aa2e41c0c","description":"Searching for port.*7700|port.*9090|:7700|:9090","usage":{"total_tokens":0,"tool_uses":20,"duration_ms":32487},"last_tool_name":"Grep","uuid":"3142f12e-dd76-471f-bb2c-92ae18b2065f","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379"} +{"type":"assistant","message":{"id":"msg_20260523142320b168e93344ed4dd9","type":"message","role":"assistant","model":"glm-4.7","content":[{"type":"tool_use","id":"call_f33c4cab2f974591b2f2c9ce","name":"Grep","input":{"output_mode":"content","pattern":"port.*7700|port.*9090|:7700|:9090"}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":"call_fbc4ae069de4433aa2e41c0c","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"ac6f6f81-a88a-4d31-b86a-e6f3f90b2229"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_3a27e98d7bb947f7883fed95","type":"tool_result","content":"1\t//! Admin router for /_miroir/* endpoints.\n2\t//!\n3\t//! This router requires `admin_endpoints::AppState` to be provided via `.with_state()`.\n4\t\n5\tuse axum::{\n6\t extract::FromRef,\n7\t routing::{delete, get, post, put},\n8\t Router,\n9\t};\n10\tuse super::{admin_endpoints, aliases, canary, explain, session};\n11\t\n12\t/// Create the admin router with all /_miroir/* endpoints.\n13\t///\n14\t/// Returns a stateless router that must be given a state via `.with_state()`\n15\t/// before use. The state type must implement `FromRef` to extract\n16\t/// `admin_endpoints::AppState`.\n17\tpub fn router() -> Router\n18\twhere\n19\t S: Clone + Send + Sync + 'static,\n20\t admin_endpoints::AppState: FromRef,\n21\t aliases::AliasState: FromRef,\n22\t explain::ExplainState: FromRef,\n23\t canary::CanaryState: FromRef,\n24\t{\n25\t Router::new()\n26\t // Admin session endpoints (plan §9, §13.19)\n27\t .route(\"/admin/login\", post(session::admin_login::))\n28\t .route(\"/admin/session\", get(session::admin_session::))\n29\t .route(\"/admin/logout\", post(session::admin_logout::))\n30\t // Search UI session endpoint (plan §9, §13.21)\n31\t .route(\n32\t \"/ui/search/{index}/session\",\n33\t get(session::search_ui_session::),\n34\t )\n35\t // Admin API endpoints\n36\t .route(\"/topology\", get(admin_endpoints::get_topology::))\n37\t .route(\"/shards\", get(admin_endpoints::get_shards::))\n38\t .route(\"/ready\", get(admin_endpoints::get_ready::))\n39\t .route(\"/metrics\", get(admin_endpoints::get_metrics::))\n40\t .route(\n41\t \"/ui/search/{index}/rotate-scoped-key\",\n42\t post(admin_endpoints::rotate_scoped_key_handler),\n43\t )\n44\t // Alias management (plan §13.7)\n45\t .route(\"/aliases\", get(aliases::list_aliases::))\n46\t .route(\"/aliases/{name}\", post(aliases::create_alias::))\n47\t .route(\"/aliases/{name}\", get(aliases::get_alias::))\n48\t .route(\"/aliases/{name}\", put(aliases::update_alias::))\n49\t .route(\"/aliases/{name}\", delete(aliases::delete_alias::))\n50\t // Canary management (plan §13.18)\n51\t .route(\"/canaries\", post(canary::create_canary::))\n52\t .route(\"/canaries\", get(canary::get_canary_status::))\n53\t .route(\"/canaries/{id}\", get(canary::get_canary::))\n54\t .route(\"/canaries/{id}\", put(canary::update_canary::))\n55\t .route(\"/canaries/{id}\", delete(canary::delete_canary::))\n56\t .route(\"/canaries/capture\", post(canary::start_capture::))\n57\t .route(\"/canaries/captured\", get(canary::get_captured::))\n58\t .route(\"/canaries/from-capture/{index}\", post(canary::create_from_capture::))\n59\t // Explain endpoint (plan §13.20)\n60\t .route(\"/indexes/{index}/explain\", post(explain::explain_search::))\n61\t // Node management (plan §2 node addition flow)\n62\t .route(\"/nodes\", post(admin_endpoints::add_node::))\n63\t .route(\"/nodes/{id}\", delete(admin_endpoints::remove_node::))\n64\t .route(\"/nodes/{id}/drain\", post(admin_endpoints::drain_node::))\n65\t .route(\"/nodes/{id}/fail\", post(admin_endpoints::fail_node::))\n66\t .route(\"/nodes/{id}/recover\", post(admin_endpoints::recover_node::))\n67\t // Rebalancer status\n68\t .route(\"/rebalance/status\", get(admin_endpoints::get_rebalance_status::))\n69\t // Replica group management\n70\t .route(\"/replica_groups\", post(admin_endpoints::add_replica_group::))\n71\t .route(\"/replica_groups/{id}\", delete(admin_endpoints::remove_replica_group::))\n72\t}\n73\t"}]},"parent_tool_use_id":"call_fbc4ae069de4433aa2e41c0c","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"5573c2b1-d020-4b63-91ca-a62b3b4c30ea","timestamp":"2026-05-23T06:23:23.586Z"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_3daae31811134342b28c40d8","type":"tool_result","content":"1\t//! Admin API endpoints for topology, readiness, shards, and metrics.\n2\t\n3\tuse axum::{\n4\t extract::{FromRef, Path, State},\n5\t http::{HeaderMap, StatusCode},\n6\t Json,\n7\t response::{IntoResponse, Response},\n8\t};\n9\tuse miroir_core::{\n10\t config::MiroirConfig,\n11\t migration::{MigrationConfig, MigrationCoordinator},\n12\t rebalancer::{MigrationExecutor, Rebalancer, RebalancerConfig, RebalancerMetrics},\n13\t rebalancer_worker::{RebalancerMetricsCallback, RebalancerWorker, RebalancerWorkerConfig, TopologyChangeEvent},\n14\t router,\n15\t scatter::{DeleteByFilterRequest, FetchDocumentsRequest, FetchDocumentsResponse, WriteRequest},\n16\t task_registry::TaskRegistryImpl,\n17\t task_store::{RedisTaskStore, TaskStore},\n18\t topology::{Node, NodeId, Topology},\n19\t};\n20\tuse rand::RngCore;\n21\tuse serde::{Deserialize, Serialize};\n22\tuse std::collections::HashMap;\n23\tuse std::sync::Arc;\n24\tuse std::time::Duration;\n25\tuse tokio::sync::RwLock;\n26\tuse tracing::{info, error, warn};\n27\tuse reqwest::Client;\n28\t\n29\tuse crate::{\n30\t admin_session::{seal_session, COOKIE_NAME, SealKey},\n31\t client::HttpClient,\n32\t scoped_key_rotation::{self, ScopedKeyRotationState, RotateScopedKeyRequest, RotateScopedKeyResponse},\n33\t};\n34\t\n35\t/// Hash a PII value (IP address) for safe log correlation.\n36\tfn hash_for_log(value: &str) -> String {\n37\t use std::hash::{Hash, Hasher};\n38\t let mut hasher = std::collections::hash_map::DefaultHasher::new();\n39\t value.hash(&mut hasher);\n40\t format!(\"{:016x}\", hasher.finish())\n41\t}\n42\t\n43\t/// Request body for POST /_miroir/admin/login.\n44\t#[derive(Deserialize)]\n45\tpub struct AdminLoginRequest {\n46\t pub admin_key: String,\n47\t}\n48\t\n49\timpl std::fmt::Debug for AdminLoginRequest {\n50\t fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {\n51\t f.debug_struct(\"AdminLoginRequest\")\n52\t .field(\"admin_key\", &\"[redacted]\")\n53\t .finish()\n54\t }\n55\t}\n56\t\n57\t/// Response body for POST /_miroir/admin/login.\n58\t#[derive(Debug, Serialize)]\n59\tpub struct AdminLoginResponse {\n60\t pub success: bool,\n61\t pub message: Option,\n62\t}\n63\t\n64\t/// Version state with cache for fetching Meilisearch version.\n65\t#[derive(Clone)]\n66\tpub struct VersionState {\n67\t pub node_master_key: String,\n68\t pub node_addresses: Vec,\n69\t pub version_cache: Arc>>,\n70\t pub last_cache_update: Arc>>,\n71\t pub cache_ttl_secs: u64,\n72\t}\n73\t\n74\timpl VersionState {\n75\t pub fn new(node_master_key: String, node_addresses: Vec) -> Self {\n76\t Self {\n77\t node_master_key,\n78\t node_addresses,\n79\t version_cache: Arc::new(RwLock::new(None)),\n80\t last_cache_update: Arc::new(RwLock::new(None)),\n81\t cache_ttl_secs: 60,\n82\t }\n83\t }\n84\t\n85\t /// Fetch version from a healthy node, using cache if within TTL.\n86\t pub async fn get_version(&self) -> Result {\n87\t // Check cache first\n88\t {\n89\t let cache = self.version_cache.read().await;\n90\t let last_update = self.last_cache_update.read().await;\n91\t if let (Some(ref cached), Some(last)) = (cache.as_ref(), last_update.as_ref()) {\n92\t if last.elapsed().as_secs() < self.cache_ttl_secs {\n93\t return Ok((**cached).clone());\n94\t }\n95\t }\n96\t }\n97\t\n98\t // Cache miss or expired - fetch from a node\n99\t let client = Client::builder()\n100\t .timeout(Duration::from_secs(2))"}]},"parent_tool_use_id":"call_fbc4ae069de4433aa2e41c0c","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"2d33a481-a3d0-4ec7-8235-896669795542","timestamp":"2026-05-23T06:23:23.587Z"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_f33c4cab2f974591b2f2c9ce","type":"tool_result","content":"\nOutput too large (25.1KB). Full output saved to: /home/coding/.claude/projects/-home-coding-miroir/22370ae0-df6e-4abf-81b6-c6f5b4e0c379/tool-results/call_f33c4cab2f974591b2f2c9ce.txt\n\nPreview (first 2KB):\nREADME.md:66:curl http://localhost:7700/health\nREADME.md:70:curl -X POST http://localhost:7700/indexes/movies/documents \\\nREADME.md:76:curl -X POST http://localhost:7700/indexes/movies/search \\\nmiroir.yaml:10: port: 7700\nbenches/dfs_preflight.rs:27: format!(\"http://node-{}:7700\", i),\ntests/verify_p7_1_core_metrics.sh:8:BASE_URL=\"${MIROIR_BASE_URL:-http://localhost:7700}\"\ntests/verify_p7_1_core_metrics.sh:9:METRICS_URL=\"${MIROIR_METRICS_URL:-http://localhost:9090}\"\ntests/verify_p7_1_core_metrics.sh:36:echo \"1. Checking port 9090 /metrics endpoint (unauthenticated)...\"\ntests/verify_p7_1_core_metrics.sh:45:echo \"2. Checking port 7700 /_miroir/metrics endpoint (admin-key gated)...\"\ntests/verify_p7_1_core_metrics.sh:95: echo \" ❌ FAILED: Metrics differ between :9090/metrics and :7700/_miroir/metrics\"\ncharts/miroir/templates/miroir-deployment.yaml:24: prometheus.io/port: \"9090\"\ncharts/miroir/templates/meilisearch-service.yaml:15: - port: 7700\ncharts/miroir/templates/meilisearch-service.yaml:38: - port: 7700\ncharts/miroir/templates/miroir-service.yaml:19: - port: {{ .Values.service.ports.http | default 7700 }}\ncharts/miroir/templates/miroir-service.yaml:23: - port: {{ .Values.service.ports.metrics | default 9090 }}\ncharts/miroir/templates/NOTES.txt:5: kubectl port-forward -n {{ .Release.Namespace }} \"$POD_NAME\" 7700:7700\ncharts/miroir/templates/NOTES.txt:7:Then visit http://localhost:7700/health to verify the proxy is running.\ncharts/miroir/templates/_helpers.tpl:73: http://release-name-meili-0.release-name-meili-headless.namespace.svc.cluster.local:7700\ncharts/miroir/templates/_helpers.tpl:77:http://{{ .release.Name }}-meili-{{ .nodeIndex }}.{{ .release.Name }}-meili-headless.{{ $ns }}.svc.cluster.local:7700\ncharts/miroir/templates/_helpers.tpl:134: port: 7700\ncharts/miroir/templates/miroir-headless.yaml:20: - port: {{ .Values.service.ports.http | default 7700 }}\n...\n"}]},"parent_tool_use_id":"call_fbc4ae069de4433aa2e41c0c","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"840db805-38f1-4b22-836d-c6ef177644b0","timestamp":"2026-05-23T06:23:23.637Z"} +{"type":"system","subtype":"task_progress","task_id":"af072207fd7dde702","tool_use_id":"call_fbc4ae069de4433aa2e41c0c","description":"Searching for impl.*Toplogy|pub struct Topology","usage":{"total_tokens":0,"tool_uses":21,"duration_ms":37165},"last_tool_name":"Grep","uuid":"84e77679-1a45-4191-8ab0-525625d6c02d","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379"} +{"type":"assistant","message":{"id":"msg_202605231423254192090230f44961","type":"message","role":"assistant","model":"glm-4.7","content":[{"type":"tool_use","id":"call_d09e29b6559b44e9b6e59d7e","name":"Grep","input":{"output_mode":"content","pattern":"impl.*Toplogy|pub struct Topology","path":"/home/coding/miroir/crates/miroir-core/src/topology.rs"}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":"call_fbc4ae069de4433aa2e41c0c","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"fbdf78e2-87de-44da-931b-6f265a32921f"} +{"type":"system","subtype":"task_progress","task_id":"af072207fd7dde702","tool_use_id":"call_fbc4ae069de4433aa2e41c0c","description":"Reading crates/miroir-proxy/src/routes/search.rs","usage":{"total_tokens":0,"tool_uses":22,"duration_ms":37492},"last_tool_name":"Read","uuid":"80d516f0-0074-428e-ae7b-a894d58f1096","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379"} +{"type":"assistant","message":{"id":"msg_202605231423254192090230f44961","type":"message","role":"assistant","model":"glm-4.7","content":[{"type":"tool_use","id":"call_3fbe8463d75c4c75b5367448","name":"Read","input":{"file_path":"/home/coding/miroir/crates/miroir-proxy/src/routes/search.rs","limit":50}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":"call_fbc4ae069de4433aa2e41c0c","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"9b68f082-ca09-4bf5-bc95-47ba99563ae3"} +{"type":"system","subtype":"task_progress","task_id":"af072207fd7dde702","tool_use_id":"call_fbc4ae069de4433aa2e41c0c","description":"Reading crates/miroir-proxy/src/routes/documents.rs","usage":{"total_tokens":0,"tool_uses":23,"duration_ms":37546},"last_tool_name":"Read","uuid":"260716b5-0329-4651-b911-3e9bcda2d1c7","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379"} +{"type":"assistant","message":{"id":"msg_202605231423254192090230f44961","type":"message","role":"assistant","model":"glm-4.7","content":[{"type":"tool_use","id":"call_18eca28da28a47f1aabb3eba","name":"Read","input":{"file_path":"/home/coding/miroir/crates/miroir-proxy/src/routes/documents.rs","limit":50}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":"call_fbc4ae069de4433aa2e41c0c","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"57bc70a0-2739-4059-8268-02ea1fc9eaad"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_3fbe8463d75c4c75b5367448","type":"tool_result","content":"1\t//! Search route handler with DFS (Distributed Frequency Search) support.\n2\t\n3\tuse axum::extract::{Extension, Path};\n4\tuse axum::http::{HeaderMap, StatusCode};\n5\tuse axum::response::Response;\n6\tuse axum::Json;\n7\tuse miroir_core::api_error::{MeilisearchError, MiroirCode};\n8\tuse miroir_core::config::UnavailableShardPolicy;\n9\tuse miroir_core::merger::ScoreMergeStrategy;\n10\tuse miroir_core::scatter::{\n11\t dfs_query_then_fetch_search, plan_search_scatter, plan_search_scatter_for_group, plan_search_scatter_with_version_floor, SearchRequest, NodeClient,\n12\t};\n13\tuse miroir_core::session_pinning::WaitStrategy;\n14\tuse serde::Deserialize;\n15\tuse serde_json::Value;\n16\tuse std::sync::Arc;\n17\tuse std::time::Instant;\n18\tuse tracing::{debug, error, info, info_span, instrument, warn};\n19\t\n20\tuse crate::middleware::SessionId;\n21\tuse crate::routes::admin_endpoints::{AppState, parse_rate_limit};\n22\t\n23\t/// Hash a value for logging (obfuscates sensitive data like IPs).\n24\tfn hash_for_log(value: &str) -> String {\n25\t use std::hash::{Hash, Hasher};\n26\t let mut hasher = std::collections::hash_map::DefaultHasher::new();\n27\t value.hash(&mut hasher);\n28\t format!(\"{:016x}\", hasher.finish())\n29\t}\n30\t\n31\t/// Node client implementation using the HTTP client.\n32\t///\n33\t/// Wraps each node call with Prometheus metrics recording for\n34\t/// `miroir_node_request_duration_seconds` and `miroir_node_errors_total`.\n35\tpub struct ProxyNodeClient {\n36\t client: Arc,\n37\t metrics: crate::middleware::Metrics,\n38\t}\n39\t\n40\timpl ProxyNodeClient {\n41\t pub fn new(client: Arc, metrics: crate::middleware::Metrics) -> Self {\n42\t Self { client, metrics }\n43\t }\n44\t}\n45\t\n46\t#[allow(async_fn_in_trait)]\n47\timpl NodeClient for ProxyNodeClient {\n48\t async fn search_node(\n49\t &self,\n50\t node: &miroir_core::topology::NodeId,"}]},"parent_tool_use_id":"call_fbc4ae069de4433aa2e41c0c","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"67da154b-b666-437e-9de0-f0aee911d9f1","timestamp":"2026-05-23T06:23:28.658Z"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_18eca28da28a47f1aabb3eba","type":"tool_result","content":"1\t//! Document write path: add, replace, and delete documents.\n2\t//!\n3\t//! Implements P2.2 write path:\n4\t//! - Primary key extraction on the hot path\n5\t//! - `_miroir_shard` injection\n6\t//! - Reserved field rejection\n7\t//! - Two-rule quorum\n8\t//!\n9\t//! Implements P2.5 task reconciliation:\n10\t//! - Collects per-node task UIDs\n11\t//! - Registers Miroir task ID (mtask-)\n12\t//! - Returns mtask ID to client\n13\t//!\n14\t//! Implements §13.6 session pinning:\n15\t//! - Records writes with session header\n16\t//! - Tracks pinned group (first to reach quorum)\n17\t\n18\tuse axum::extract::{Extension, Path, Query};\n19\tuse axum::response::{IntoResponse, Response};\n20\tuse axum::http::{StatusCode, header};\n21\tuse axum::{Json, Router};\n22\tuse miroir_core::api_error::{MiroirCode, MeilisearchError};\n23\tuse miroir_core::router::{shard_for_key, write_targets_with_migration};\n24\tuse miroir_core::scatter::{DeleteByIdsRequest, DeleteByFilterRequest, NodeClient, WriteRequest, WriteResponse};\n25\tuse miroir_core::task::TaskRegistry;\n26\tuse miroir_core::topology::{Topology, NodeId};\n27\tuse serde::{Deserialize, Serialize};\n28\tuse serde_json::Value;\n29\tuse std::collections::HashMap;\n30\tuse std::sync::Arc;\n31\tuse tracing::{debug, info, instrument};\n32\t\n33\tuse crate::client::HttpClient;\n34\tuse crate::middleware::SessionId;\n35\tuse crate::routes::admin_endpoints::AppState;\n36\t\n37\t/// Document write parameters from query string.\n38\t#[derive(Debug, Deserialize)]\n39\tpub struct DocumentsParams {\n40\t primaryKey: Option,\n41\t}\n42\t\n43\t/// Task response (Meilisearch-compatible).\n44\t#[derive(Debug, Serialize)]\n45\tpub struct TaskResponse {\n46\t taskUid: u64,\n47\t indexUid: String,\n48\t status: String,\n49\t #[serde(skip_serializing_if = \"Option::is_none\")]\n50\t error: Option,"}]},"parent_tool_use_id":"call_fbc4ae069de4433aa2e41c0c","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"25c209ec-3036-48bb-ba0a-76accb38df18","timestamp":"2026-05-23T06:23:28.660Z"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_d09e29b6559b44e9b6e59d7e","type":"tool_result","content":"263:pub struct Topology {"}]},"parent_tool_use_id":"call_fbc4ae069de4433aa2e41c0c","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"c107ae44-a898-4f42-bf9d-67a91492e4a5","timestamp":"2026-05-23T06:23:28.671Z"} +{"type":"system","subtype":"task_progress","task_id":"af072207fd7dde702","tool_use_id":"call_fbc4ae069de4433aa2e41c0c","description":"Reading crates/miroir-proxy/tests/p7_1_core_metrics.rs","usage":{"total_tokens":0,"tool_uses":24,"duration_ms":43605},"last_tool_name":"Read","uuid":"c7354613-fb49-4155-98fc-4072f60552ba","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379"} +{"type":"assistant","message":{"id":"msg_20260523142332113a1e9b030644d6","type":"message","role":"assistant","model":"glm-4.7","content":[{"type":"tool_use","id":"call_baba721b92b741188c66381a","name":"Read","input":{"file_path":"/home/coding/miroir/crates/miroir-proxy/tests/p7_1_core_metrics.rs","limit":100}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":"call_fbc4ae069de4433aa2e41c0c","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"92a7e7f4-8ff0-42e5-94cf-d8eb85d492aa"} +{"type":"system","subtype":"task_progress","task_id":"af072207fd7dde702","tool_use_id":"call_fbc4ae069de4433aa2e41c0c","description":"Searching for pub.*fn.*shard_for_key|pub.*fn.*write_targets","usage":{"total_tokens":0,"tool_uses":25,"duration_ms":44181},"last_tool_name":"Grep","uuid":"b051fc2d-561a-4f18-a0ba-944897b18235","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379"} +{"type":"assistant","message":{"id":"msg_20260523142332113a1e9b030644d6","type":"message","role":"assistant","model":"glm-4.7","content":[{"type":"tool_use","id":"call_20051fef334248a8bd36e728","name":"Grep","input":{"output_mode":"content","path":"/home/coding/miroir/crates/miroir-core/src","pattern":"pub.*fn.*shard_for_key|pub.*fn.*write_targets"}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":"call_fbc4ae069de4433aa2e41c0c","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"8b9349eb-0406-4b46-9cb5-4ab36c1fc081"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_baba721b92b741188c66381a","type":"tool_result","content":"1\t//! P7.1 Core metrics families acceptance tests.\n2\t//!\n3\t//! Verifies that all plan §10 core metrics are properly registered and accessible.\n4\t\n5\tuse miroir_proxy::middleware::Metrics;\n6\tuse miroir_core::config::MiroirConfig;\n7\t\n8\t#[test]\n9\tfn test_all_core_metrics_registered() {\n10\t let config = MiroirConfig::default();\n11\t let metrics = Metrics::new(&config);\n12\t\n13\t // Add sample data to ensure metrics appear in output\n14\t // Request metrics - use telemetry middleware to record these\n15\t // (we can't directly access the private fields)\n16\t metrics.requests_in_flight().inc();\n17\t metrics.requests_in_flight().dec();\n18\t\n19\t // Node metrics\n20\t metrics.set_node_healthy(\"node-1\", true);\n21\t metrics.record_node_request_duration(\"node-1\", \"search\", 0.05);\n22\t metrics.inc_node_errors(\"node-1\", \"timeout\");\n23\t\n24\t // Shard metrics - use f64 for values\n25\t metrics.set_shard_coverage(1.0);\n26\t metrics.set_degraded_shards(0.0);\n27\t metrics.set_shard_distribution(\"node-1\", 32.0);\n28\t\n29\t // Task metrics\n30\t metrics.observe_task_processing_age(0.1);\n31\t metrics.inc_tasks_total(\"completed\");\n32\t metrics.set_task_registry_size(5.0);\n33\t\n34\t // Scatter-gather metrics\n35\t metrics.record_scatter_fan_out(3);\n36\t metrics.inc_scatter_partial_responses();\n37\t metrics.inc_scatter_retries();\n38\t\n39\t // Rebalancer metrics\n40\t metrics.set_rebalance_in_progress(false);\n41\t metrics.inc_rebalance_documents_migrated(100);\n42\t metrics.observe_rebalance_duration(10.0);\n43\t\n44\t let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n45\t let output = encoded.as_str();\n46\t\n47\t // Verify all 18 core plan §10 metric names appear in the output\n48\t let expected_metrics = [\n49\t // Request metrics (3)\n50\t \"miroir_request_duration_seconds\",\n51\t \"miroir_requests_total\",\n52\t \"miroir_requests_in_flight\",\n53\t // Node health metrics (3)\n54\t \"miroir_node_healthy\",\n55\t \"miroir_node_request_duration_seconds\",\n56\t \"miroir_node_errors_total\",\n57\t // Shard metrics (3)\n58\t \"miroir_shard_coverage\",\n59\t \"miroir_degraded_shards_total\",\n60\t \"miroir_shard_distribution\",\n61\t // Task metrics (3)\n62\t \"miroir_task_processing_age_seconds\",\n63\t \"miroir_tasks_total\",\n64\t \"miroir_task_registry_size\",\n65\t // Scatter-gather metrics (3)\n66\t \"miroir_scatter_fan_out_size\",\n67\t \"miroir_scatter_partial_responses_total\",\n68\t \"miroir_scatter_retries_total\",\n69\t // Rebalancer metrics (3)\n70\t \"miroir_rebalance_in_progress\",\n71\t \"miroir_rebalance_documents_migrated_total\",\n72\t \"miroir_rebalance_duration_seconds\",\n73\t ];\n74\t\n75\t for name in &expected_metrics {\n76\t assert!(\n77\t output.contains(name),\n78\t \"missing core metric: {}\",\n79\t name\n80\t );\n81\t }\n82\t}\n83\t\n84\t#[test]\n85\tfn test_scatter_fan_out_metric_records_correctly() {\n86\t let config = MiroirConfig::default();\n87\t let metrics = Metrics::new(&config);\n88\t\n89\t // Record a scatter operation that hit 3 nodes\n90\t metrics.record_scatter_fan_out(3);\n91\t\n92\t let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n93\t let output = encoded.as_str();\n94\t\n95\t // Verify the metric is present\n96\t assert!(\n97\t output.contains(\"miroir_scatter_fan_out_size\"),\n98\t \"miroir_scatter_fan_out_size metric not found\"\n99\t );\n100\t"}]},"parent_tool_use_id":"call_fbc4ae069de4433aa2e41c0c","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"0848e5da-3ea4-45cf-be71-127cd27c2266","timestamp":"2026-05-23T06:23:35.282Z"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_20051fef334248a8bd36e728","type":"tool_result","content":"crates/miroir-core/src/router.rs:42:pub fn write_targets(shard_id: u32, topology: &Topology) -> Vec {\ncrates/miroir-core/src/router.rs:63:pub fn write_targets_with_migration(\ncrates/miroir-core/src/router.rs:162:pub fn shard_for_key(primary_key: &str, shard_count: u32) -> u32 {"}]},"parent_tool_use_id":"call_fbc4ae069de4433aa2e41c0c","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"f981b06f-bb3a-4c82-9073-152088dfdb61","timestamp":"2026-05-23T06:23:35.291Z"} +{"type":"system","subtype":"task_progress","task_id":"af072207fd7dde702","tool_use_id":"call_fbc4ae069de4433aa2e41c0c","description":"Reading crates/miroir-core/src/router.rs","usage":{"total_tokens":0,"tool_uses":26,"duration_ms":48131},"last_tool_name":"Read","uuid":"f2cd07d8-da22-42a8-8d5a-10b503fd67f8","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379"} +{"type":"assistant","message":{"id":"msg_20260523142337dc1c7c25440b4a85","type":"message","role":"assistant","model":"glm-4.7","content":[{"type":"tool_use","id":"call_b40fc01fa7e846099784ce30","name":"Read","input":{"file_path":"/home/coding/miroir/crates/miroir-core/src/router.rs","limit":150}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":"call_fbc4ae069de4433aa2e41c0c","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"3c6d44c7-4d9a-4edc-94db-c0691cedb7bb"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_b40fc01fa7e846099784ce30","type":"tool_result","content":"1\t//! Rendezvous hash-based routing and shard assignment.\n2\t\n3\tuse crate::migration::{MigrationCoordinator, ShardId};\n4\tuse crate::topology::{Group, NodeId, Topology};\n5\tuse std::collections::HashSet;\n6\tuse std::hash::{Hash, Hasher};\n7\tuse twox_hash::XxHash64;\n8\t\n9\t/// Compute a rendezvous score for a shard+node pair.\n10\t///\n11\t/// Higher scores win; used for deterministic shard assignment.\n12\tpub fn score(shard_id: u32, node_id: &str) -> u64 {\n13\t let mut h = XxHash64::with_seed(0);\n14\t shard_id.hash(&mut h);\n15\t node_id.hash(&mut h);\n16\t h.finish()\n17\t}\n18\t\n19\t/// Assign a shard to `rf` nodes within a single replica group.\n20\t///\n21\t/// `group_nodes` is the subset of nodes belonging to that group.\n22\t///\n23\t/// Sorts by score descending, breaking ties lexicographically on node_id\n24\t/// for deterministic resolution.\n25\tpub fn assign_shard_in_group(shard_id: u32, group_nodes: &[NodeId], rf: usize) -> Vec {\n26\t let mut scored: Vec<(u64, &NodeId)> = group_nodes\n27\t .iter()\n28\t .map(|n| (score(shard_id, n.as_str()), n))\n29\t .collect();\n30\t scored.sort_unstable_by(|a, b| {\n31\t b.0.cmp(&a.0)\n32\t .then_with(|| a.1.as_str().cmp(b.1.as_str()))\n33\t });\n34\t scored\n35\t .into_iter()\n36\t .take(rf)\n37\t .map(|(_, n)| n.clone())\n38\t .collect()\n39\t}\n40\t\n41\t/// All write targets for a document: the RF nodes in EACH replica group.\n42\tpub fn write_targets(shard_id: u32, topology: &Topology) -> Vec {\n43\t topology\n44\t .groups()\n45\t .flat_map(|group| assign_shard_in_group(shard_id, group.nodes(), topology.rf()))\n46\t .collect()\n47\t}\n48\t\n49\t/// All write targets for a document, considering dual-write state during migration.\n50\t///\n51\t/// This is the migration-aware version of `write_targets`. When a shard is in\n52\t/// dual-write phase (node addition in progress), it includes both the old owner\n53\t/// AND the new node in the target list to ensure no writes are lost during migration.\n54\t///\n55\t/// # Arguments\n56\t/// * `shard_id` - The shard ID being written to\n57\t/// * `topology` - The cluster topology\n58\t/// * `migration_coordinator` - Optional migration coordinator for dual-write detection\n59\t///\n60\t/// # Returns\n61\t/// A vector of node IDs that should receive the write. During dual-write for a shard,\n62\t/// this includes both the standard RF nodes AND the new node.\n63\tpub fn write_targets_with_migration(\n64\t shard_id: u32,\n65\t topology: &Topology,\n66\t migration_coordinator: Option<&MigrationCoordinator>,\n67\t) -> Vec {\n68\t let shard = ShardId(shard_id);\n69\t\n70\t // Start with standard write targets\n71\t let mut targets: Vec = write_targets(shard_id, topology);\n72\t\n73\t // Check if this shard is in dual-write phase\n74\t if let Some(coordinator) = migration_coordinator {\n75\t if coordinator.is_dual_write_active(shard) {\n76\t // Find migrations affecting this shard\n77\t for (_mid, state) in coordinator.get_all_migrations() {\n78\t if state.affected_shards.contains_key(&shard) {\n79\t // This shard is being migrated - include the new node\n80\t // Convert migration NodeId to topology NodeId\n81\t let new_node_id = crate::topology::NodeId::new(state.new_node.0.clone());\n82\t\n83\t // Only add if not already in targets\n84\t if !targets.contains(&new_node_id) {\n85\t targets.push(new_node_id);\n86\t }\n87\t }\n88\t }\n89\t }\n90\t }\n91\t\n92\t targets\n93\t}\n94\t\n95\t/// Select the replica group for a query (round-robin by query counter).\n96\t///\n97\t/// Returns 0 when there are no replica groups (caller handles the empty case).\n98\tpub fn query_group(query_seq: u64, replica_groups: u32) -> u32 {\n99\t if replica_groups == 0 {\n100\t return 0;\n101\t }\n102\t (query_seq % replica_groups as u64) as u32\n103\t}\n104\t\n105\t/// The covering set for a search: one node per shard within the chosen group.\n106\tpub fn covering_set(shard_count: u32, group: &Group, rf: usize, query_seq: u64) -> Vec {\n107\t (0..shard_count)\n108\t .map(|shard_id| {\n109\t let replicas = assign_shard_in_group(shard_id, group.nodes(), rf);\n110\t // rotate through replicas for intra-group load balancing\n111\t replicas[(query_seq as usize) % replicas.len()].clone()\n112\t })\n113\t .collect::>()\n114\t .into_iter()\n115\t .collect()\n116\t}\n117\t\n118\t/// Covering set with settings version floor filtering (plan §13.5).\n119\t///\n120\t/// Excludes nodes whose settings version for the given index is below `floor`.\n121\t/// Returns None if no covering set can be assembled (caller should return 503).\n122\tpub fn covering_set_with_version_floor(\n123\t shard_count: u32,\n124\t group: &Group,\n125\t rf: usize,\n126\t query_seq: u64,\n127\t index: &str,\n128\t floor: u64,\n129\t version_checker: &impl Fn(&str, &str) -> u64,\n130\t) -> Option> {\n131\t let mut result = Vec::new();\n132\t let mut used_nodes = HashSet::new();\n133\t\n134\t for shard_id in 0..shard_count {\n135\t let replicas = assign_shard_in_group(shard_id, group.nodes(), rf);\n136\t\n137\t // Filter replicas by settings version floor, then by query_seq rotation\n138\t let eligible: Vec<_> = replicas\n139\t .iter()\n140\t .filter(|node_id| {\n141\t let version = version_checker(index, node_id.as_str());\n142\t version >= floor\n143\t })\n144\t .collect();\n145\t\n146\t if eligible.is_empty() {\n147\t // No eligible replica for this shard\n148\t return None;\n149\t }\n150\t"}]},"parent_tool_use_id":"call_fbc4ae069de4433aa2e41c0c","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"efdcc434-f09a-4451-a6a8-482e571c4963","timestamp":"2026-05-23T06:23:39.227Z"} +{"type":"system","subtype":"task_notification","task_id":"af072207fd7dde702","tool_use_id":"call_fbc4ae069de4433aa2e41c0c","status":"completed","output_file":"","summary":"Explore metrics infrastructure","usage":{"total_tokens":0,"tool_uses":26,"duration_ms":63936},"uuid":"7dae5eca-251c-4ed1-80c7-b22956394c15","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_fbc4ae069de4433aa2e41c0c","type":"tool_result","content":[{"type":"text","text":"Based on my exploration of the miroir codebase, I can now provide a comprehensive summary of the metrics implementation, HTTP routing structure, admin authentication, and key component locations.\n\n## Summary of Miroir Codebase Exploration\n\n### 1. Current Metrics Implementation\n\n**Location**: `/home/coding/miroir/crates/miroir-proxy/src/middleware.rs`\n\nThe metrics system is built using **Prometheus** and already has comprehensive instrumentation:\n\n- **Metrics struct** (lines 163-286): Contains all metric types including counters, gauges, and histograms\n- **Core metrics already defined**:\n - Request metrics: duration, total, in-flight\n - Node health metrics: healthy status, request duration, errors\n - Shard metrics: coverage, degraded count, distribution\n - Task metrics: processing age, total, registry size\n - Scatter-gather metrics: fan-out size, partial responses, retries\n - Rebalancer metrics: in-progress gauge, documents migrated, duration\n - Feature-gated metrics for multi-search, vector search, CDC, TTL, tenant affinity, shadow traffic, ILM, canary, admin UI, explain, and search UI\n\n**Where to add new metrics**: Add new fields to the `Metrics` struct in the constructor (lines 380-990) and register them using the `reg!` macro.\n\n### 2. HTTP Routing Structure\n\n**Main entry point**: `/home/coding/miroir/crates/miroir-proxy/src/main.rs`\n\n**Dual server setup** (lines 645-673):\n- **Main server**: Port 7700 (configurable via `config.server.port`)\n - Handles all application traffic\n - Routes: `/health`, `/version`, `/stats`, `/multi-search`, `/_miroir/*`, `/indexes/*`, `/keys/*`, `/search/*`, `/settings/*`, `/tasks/*`\n- **Metrics server**: Port 9090 (hardcoded)\n - Only serves `/metrics` endpoint\n - Unauthenticated (for Prometheus scraping)\n\n**Middleware stack** (lines 614-642):\n1. CSRF middleware (outermost)\n2. Authentication middleware\n3. Session pinning middleware\n4. Request ID middleware\n5. Telemetry middleware (records metrics)\n\n### 3. Admin Authentication Middleware\n\n**Location**: `/home/coding/miroir/crates/miroir-proxy/src/auth.rs`\n\n**Authentication flow** (lines 648-723):\n- **Bearer token dispatch chain** implementing plan §5 rules 0-4\n- **Token types**: master_key, admin_key, JWT, admin session cookie\n- **X-Admin-Key header**: Short-circuit authentication for admin endpoints\n- **CSRF protection**: Required for state-changing requests with session cookies\n\n**Key functions**:\n- `is_dispatch_exempt()` (lines 465-513): Lists endpoints that skip authentication\n- `dispatch_bearer()` (lines 560-604): Core authentication logic\n- `auth_middleware()` (lines 648-723): Axum middleware implementation\n\n**Note**: `/metrics` on port 9090 is unauthenticated, but `/_miroir/metrics` on port 7700 requires admin key.\n\n### 4. Key Component Locations\n\n**Scatter-gather logic**: `/home/coding/miroir/crates/miroir-core/src/scatter.rs`\n- `ScatterPlan` struct: Defines shard→node mapping for queries\n- Preflight requests for global IDF computation\n- DFS (Distributed Frequency Search) implementation\n\n**Node health**: `/home/coding/miroir/crates/miroir-core/src/topology.rs`\n- `NodeStatus` enum: Healthy, Degraded, Draining, Failed, Joining, Active, Removed\n- Health checking in `/home/coding/miroir/crates/miroir-proxy/src/main.rs` (lines 686-786)\n\n**Shards**: `/home/coding/miroir/crates/miroir-core/src/router.rs`\n- `shard_for_key()`: Computes shard ID from document primary key\n- `write_targets()`: Determines which nodes receive writes\n- `covering_set()`: Selects nodes for read operations\n\n**Tasks**: `/home/coding/miroir/crates/miroir-core/src/task_registry.rs`\n- Task registry for tracking async operations\n- TTL-based task pruning\n\n**Rebalancer**: `/home/coding/miroir/crates/miroir-core/src/rebalancer.rs`\n- `TopologyOperation`: Node/group addition, removal, drain\n- `Rebalancer`: Orchestrates shard migrations\n- Worker implementation: `/home/coding/miroir/crates/miroir-core/src/rebalancer_worker/mod.rs`\n\n### 5. How to Add /metrics Endpoints\n\n**Already implemented**:\n- Port 9090: `GET /metrics` (unauthenticated) - see `metrics_router()` in middleware.rs\n- Port 7700: `GET /_miroir/metrics` (admin authentication required) - see admin.rs line 39\n\n**To add new metrics**:\n1. Add metric field to `Metrics` struct in `middleware.rs`\n2. Initialize in `Metrics::new()` constructor\n3. Register with `reg!` macro\n4. Add accessor method in `impl Metrics` block\n5. Call accessor from relevant code paths\n\n**To instrument components**:\n- **Scatter-gather**: Add metrics calls in `scatter.rs` search functions\n- **Node health**: Already instrumented in `run_health_checker()` (main.rs)\n- **Shards**: Already instrumented in `update_shard_metrics()` (main.rs)\n- **Tasks**: Add metrics in task registration/completion handlers\n- **Rebalancer**: Already has `RebalancerMetrics` trait\n\nThe codebase is well-structured with clear separation between core logic (`miroir-core`) and HTTP layer (`miroir-proxy`), comprehensive metrics already in place, and a solid authentication foundation."}]}]},"parent_tool_use_id":null,"session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"a587b9b4-4a2a-45b9-87ca-4c7f73c43f4a","timestamp":"2026-05-23T06:23:55.027Z","tool_use_result":{"status":"completed","prompt":"Explore the miroir codebase to understand:\n1. Current metrics implementation (look for existing metrics, prometheus, or similar)\n2. HTTP routing structure (axum setup, port 7700 and 9090 listeners)\n3. Admin authentication middleware\n4. Where scatter-gather, node health, shards, tasks, and rebalancer logic exists\n\nFocus on:\n- crates/miroir-core/ and crates/miroir-proxy/ directories\n- Look for existing prometheus/metrics usage\n- Find the main entry points and server setup\n- Locate the admin key middleware\n\nReturn a concise summary of:\n1. Where metrics should be defined\n2. How to add the /metrics endpoints\n3. How to instrument the various components","agentId":"af072207fd7dde702","agentType":"Explore","content":[{"type":"text","text":"Based on my exploration of the miroir codebase, I can now provide a comprehensive summary of the metrics implementation, HTTP routing structure, admin authentication, and key component locations.\n\n## Summary of Miroir Codebase Exploration\n\n### 1. Current Metrics Implementation\n\n**Location**: `/home/coding/miroir/crates/miroir-proxy/src/middleware.rs`\n\nThe metrics system is built using **Prometheus** and already has comprehensive instrumentation:\n\n- **Metrics struct** (lines 163-286): Contains all metric types including counters, gauges, and histograms\n- **Core metrics already defined**:\n - Request metrics: duration, total, in-flight\n - Node health metrics: healthy status, request duration, errors\n - Shard metrics: coverage, degraded count, distribution\n - Task metrics: processing age, total, registry size\n - Scatter-gather metrics: fan-out size, partial responses, retries\n - Rebalancer metrics: in-progress gauge, documents migrated, duration\n - Feature-gated metrics for multi-search, vector search, CDC, TTL, tenant affinity, shadow traffic, ILM, canary, admin UI, explain, and search UI\n\n**Where to add new metrics**: Add new fields to the `Metrics` struct in the constructor (lines 380-990) and register them using the `reg!` macro.\n\n### 2. HTTP Routing Structure\n\n**Main entry point**: `/home/coding/miroir/crates/miroir-proxy/src/main.rs`\n\n**Dual server setup** (lines 645-673):\n- **Main server**: Port 7700 (configurable via `config.server.port`)\n - Handles all application traffic\n - Routes: `/health`, `/version`, `/stats`, `/multi-search`, `/_miroir/*`, `/indexes/*`, `/keys/*`, `/search/*`, `/settings/*`, `/tasks/*`\n- **Metrics server**: Port 9090 (hardcoded)\n - Only serves `/metrics` endpoint\n - Unauthenticated (for Prometheus scraping)\n\n**Middleware stack** (lines 614-642):\n1. CSRF middleware (outermost)\n2. Authentication middleware\n3. Session pinning middleware\n4. Request ID middleware\n5. Telemetry middleware (records metrics)\n\n### 3. Admin Authentication Middleware\n\n**Location**: `/home/coding/miroir/crates/miroir-proxy/src/auth.rs`\n\n**Authentication flow** (lines 648-723):\n- **Bearer token dispatch chain** implementing plan §5 rules 0-4\n- **Token types**: master_key, admin_key, JWT, admin session cookie\n- **X-Admin-Key header**: Short-circuit authentication for admin endpoints\n- **CSRF protection**: Required for state-changing requests with session cookies\n\n**Key functions**:\n- `is_dispatch_exempt()` (lines 465-513): Lists endpoints that skip authentication\n- `dispatch_bearer()` (lines 560-604): Core authentication logic\n- `auth_middleware()` (lines 648-723): Axum middleware implementation\n\n**Note**: `/metrics` on port 9090 is unauthenticated, but `/_miroir/metrics` on port 7700 requires admin key.\n\n### 4. Key Component Locations\n\n**Scatter-gather logic**: `/home/coding/miroir/crates/miroir-core/src/scatter.rs`\n- `ScatterPlan` struct: Defines shard→node mapping for queries\n- Preflight requests for global IDF computation\n- DFS (Distributed Frequency Search) implementation\n\n**Node health**: `/home/coding/miroir/crates/miroir-core/src/topology.rs`\n- `NodeStatus` enum: Healthy, Degraded, Draining, Failed, Joining, Active, Removed\n- Health checking in `/home/coding/miroir/crates/miroir-proxy/src/main.rs` (lines 686-786)\n\n**Shards**: `/home/coding/miroir/crates/miroir-core/src/router.rs`\n- `shard_for_key()`: Computes shard ID from document primary key\n- `write_targets()`: Determines which nodes receive writes\n- `covering_set()`: Selects nodes for read operations\n\n**Tasks**: `/home/coding/miroir/crates/miroir-core/src/task_registry.rs`\n- Task registry for tracking async operations\n- TTL-based task pruning\n\n**Rebalancer**: `/home/coding/miroir/crates/miroir-core/src/rebalancer.rs`\n- `TopologyOperation`: Node/group addition, removal, drain\n- `Rebalancer`: Orchestrates shard migrations\n- Worker implementation: `/home/coding/miroir/crates/miroir-core/src/rebalancer_worker/mod.rs`\n\n### 5. How to Add /metrics Endpoints\n\n**Already implemented**:\n- Port 9090: `GET /metrics` (unauthenticated) - see `metrics_router()` in middleware.rs\n- Port 7700: `GET /_miroir/metrics` (admin authentication required) - see admin.rs line 39\n\n**To add new metrics**:\n1. Add metric field to `Metrics` struct in `middleware.rs`\n2. Initialize in `Metrics::new()` constructor\n3. Register with `reg!` macro\n4. Add accessor method in `impl Metrics` block\n5. Call accessor from relevant code paths\n\n**To instrument components**:\n- **Scatter-gather**: Add metrics calls in `scatter.rs` search functions\n- **Node health**: Already instrumented in `run_health_checker()` (main.rs)\n- **Shards**: Already instrumented in `update_shard_metrics()` (main.rs)\n- **Tasks**: Add metrics in task registration/completion handlers\n- **Rebalancer**: Already has `RebalancerMetrics` trait\n\nThe codebase is well-structured with clear separation between core logic (`miroir-core`) and HTTP layer (`miroir-proxy`), comprehensive metrics already in place, and a solid authentication 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Structured logging, request IDs, and Prometheus metrics middleware.\n2\t\n3\tuse std::time::Instant;\n4\t\n5\tuse axum::{\n6\t extract::{Request, State},\n7\t http::{HeaderMap, HeaderValue},\n8\t middleware::Next,\n9\t response::Response,\n10\t Router,\n11\t routing::get,\n12\t};\n13\tuse miroir_core::config::MiroirConfig;\n14\tuse prometheus::{\n15\t Counter, CounterVec, Encoder, Gauge, GaugeVec, Histogram, HistogramOpts, HistogramVec, Opts,\n16\t Registry, TextEncoder,\n17\t};\n18\tuse tracing::info_span;\n19\tuse uuid::Uuid;\n20\tuse hex;\n21\tuse std::collections::hash_map::DefaultHasher;\n22\tuse std::hash::{Hash, Hasher};\n23\t\n24\t/// Request ID wrapper type for storing in axum Request extensions.\n25\t///\n26\t/// This is a newtype wrapper around the 8-character hex request ID,\n27\t/// allowing handlers to extract it via `Request.extensions().get::()`.\n28\t#[derive(Clone, Debug, PartialEq, Eq, Hash)]\n29\tpub struct RequestId(pub String);\n30\t\n31\timpl RequestId {\n32\t /// Create a new RequestId from a UUIDv7.\n33\t ///\n34\t /// Hashes the full UUIDv7 to produce an 8-character hex ID that is unique\n35\t /// even for consecutive calls within the same millisecond.\n36\t pub fn new() -> Self {\n37\t let uuid = Uuid::now_v7();\n38\t let bytes = uuid.as_bytes();\n39\t // Hash the full UUID to ensure uniqueness even within the same millisecond\n40\t let mut hasher = DefaultHasher::new();\n41\t hasher.write(bytes);\n42\t let hash = hasher.finish();\n43\t // Take first 8 hex chars of 64-bit hash (32 bits is sufficient entropy)\n44\t Self(format!(\"{:08x}\", hash as u32))\n45\t }\n46\t\n47\t /// Get the inner request ID string.\n48\t pub fn as_str(&self) -> &str {\n49\t &self.0\n50\t }\n51\t\n52\t /// Parse a RequestId from a string.\n53\t pub fn parse(s: String) -> Option {\n54\t if s.len() == 8 && s.chars().all(|c| c.is_ascii_hexdigit()) {\n55\t Some(Self(s))\n56\t } else {\n57\t None\n58\t }\n59\t }\n60\t}\n61\t\n62\t/// Session ID wrapper type for read-your-writes session pinning (plan §13.6).\n63\t///\n64\t/// Extracted from the `X-Miroir-Session` header and stored in request extensions.\n65\t/// Handlers can access it via `Request.extensions().get::()`.\n66\t#[derive(Clone, Debug, PartialEq, Eq, Hash)]\n67\tpub struct SessionId(pub String);\n68\t\n69\timpl Default for SessionId {\n70\t fn default() -> Self {\n71\t Self(String::new())\n72\t }\n73\t}\n74\t\n75\timpl SessionId {\n76\t /// Get the inner session ID string.\n77\t pub fn as_str(&self) -> &str {\n78\t &self.0\n79\t }\n80\t\n81\t /// Parse a SessionId from a string.\n82\t ///\n83\t /// Accepts any non-empty string (client-provided UUID or identifier).\n84\t pub fn parse(s: String) -> Option {\n85\t if !s.is_empty() && s.len() <= 256 {\n86\t Some(Self(s))\n87\t } else {\n88\t None\n89\t }\n90\t }\n91\t}\n92\t\n93\tpub async fn request_id_middleware(\n94\t mut req: Request,\n95\t next: Next,\n96\t) -> Response {\n97\t // Check for existing request ID in headers\n98\t let request_id = req\n99\t .headers()\n100\t .get(\"x-request-id\")\n101\t .and_then(|v| v.to_str().ok())\n102\t .and_then(|s| RequestId::parse(s.to_string()))\n103\t .unwrap_or_else(RequestId::new);\n104\t\n105\t // Store in request extensions for handler access\n106\t req.extensions_mut().insert(request_id.clone());\n107\t\n108\t // Set X-Request-Id header on request (for telemetry_middleware to read)\n109\t if let Ok(val) = HeaderValue::from_str(request_id.as_str()) {\n110\t req.headers_mut().insert(\"x-request-id\", val);\n111\t }\n112\t\n113\t // Process the request\n114\t let mut response = next.run(req).await;\n115\t\n116\t // Add X-Request-Id header to response (override if exists)\n117\t if let Ok(val) = HeaderValue::from_str(request_id.as_str()) {\n118\t response.headers_mut().insert(\"x-request-id\", val);\n119\t }\n120\t\n121\t response\n122\t}\n123\t\n124\t/// Session pinning middleware (plan §13.6).\n125\t///\n126\t/// Extracts the `X-Miroir-Session` header and stores it in request extensions\n127\t/// for handlers to access via `Request.extensions().get::()`.\n128\tpub async fn session_pinning_middleware(\n129\t mut req: Request,\n130\t next: Next,\n131\t) -> Response {\n132\t // Extract session ID from header if present\n133\t let session_id = req\n134\t .headers()\n135\t .get(\"x-miroir-session\")\n136\t .and_then(|v| v.to_str().ok())\n137\t .and_then(|s| SessionId::parse(s.to_string()));\n138\t\n139\t // Store in request extensions for handler access\n140\t if let Some(sid) = session_id {\n141\t req.extensions_mut().insert(sid);\n142\t }\n143\t\n144\t next.run(req).await\n145\t}\n146\t\n147\t\n148\t/// Telemetry state combining metrics and pod_id for middleware.\n149\t#[derive(Clone)]\n150\tpub struct TelemetryState {\n151\t pub metrics: Metrics,\n152\t pub pod_id: String,\n153\t}\n154\t\n155\timpl TelemetryState {\n156\t pub fn new(metrics: Metrics) -> Self {\n157\t let pod_id = std::env::var(\"POD_NAME\").unwrap_or_else(|_| \"unknown\".to_string());\n158\t Self { metrics, pod_id }\n159\t }\n160\t}\n161\t\n162\t/// Global metrics registry shared across all middleware instances.\n163\tpub struct Metrics {\n164\t registry: Registry,\n165\t\n166\t // ── Request metrics ──\n167\t request_duration: HistogramVec,\n168\t requests_total: CounterVec,\n169\t requests_in_flight: Gauge,\n170\t\n171\t // ── Node health metrics ──\n172\t node_healthy: GaugeVec,\n173\t node_request_duration: HistogramVec,\n174\t node_errors: CounterVec,\n175\t\n176\t // ── Shard metrics ──\n177\t shard_coverage: Gauge,\n178\t degraded_shards: Gauge,\n179\t shard_distribution: GaugeVec,\n180\t\n181\t // ── Task metrics ──\n182\t task_processing_age: Histogram,\n183\t tasks_total: CounterVec,\n184\t task_registry_size: Gauge,\n185\t\n186\t // ── Scatter-gather metrics ──\n187\t scatter_fan_out_size: Histogram,\n188\t scatter_partial_responses: Counter,\n189\t scatter_retries: Counter,\n190\t\n191\t // ── Rebalancer metrics ──\n192\t rebalance_in_progress: Gauge,\n193\t rebalance_documents_migrated: Counter,\n194\t rebalance_duration: Histogram,\n195\t\n196\t // ── §13.11 Multi-search metrics (feature-gated) ──\n197\t multisearch_queries_per_batch: Option,\n198\t multisearch_batches_total: Option,\n199\t multisearch_partial_failures_total: Option,\n200\t multisearch_tenant_session_pin_override_total: Option,\n201\t\n202\t // ── §13.12 Vector search metrics (feature-gated) ──\n203\t vector_search_over_fetched_total: Option,\n204\t vector_merge_strategy: Option,\n205\t vector_embedder_drift_total: Option,\n206\t\n207\t // ── §13.13 CDC metrics (feature-gated) ──\n208\t cdc_events_published_total: Option,\n209\t cdc_lag_seconds: Option,\n210\t cdc_buffer_bytes: Option,\n211\t cdc_dropped_total: Option,\n212\t cdc_events_suppressed_total: Option,\n213\t\n214\t // ── §13.14 TTL metrics (feature-gated) ──\n215\t ttl_documents_expired_total: Option,\n216\t ttl_sweep_duration_seconds: Option,\n217\t ttl_pending_estimate: Option,\n218\t\n219\t // ── §13.15 Tenant affinity metrics (feature-gated) ──\n220\t tenant_queries_total: Option,\n221\t tenant_pinned_groups: Option,\n222\t tenant_fallback_total: Option,\n223\t\n224\t // ── §13.16 Shadow traffic metrics (feature-gated) ──\n225\t shadow_diff_total: Option,\n226\t shadow_kendall_tau: Option,\n227\t shadow_latency_delta_seconds: Option,\n228\t shadow_errors_total: Option,\n229\t\n230\t // ── §13.17 ILM metrics (feature-gated) ──\n231\t rollover_events_total: Option,\n232\t rollover_active_indexes: Option,\n233\t rollover_documents_expired_total: Option,\n234\t rollover_last_action_seconds: Option,\n235\t\n236\t // ── §13.18 Canary metrics (feature-gated) ──\n237\t canary_runs_total: Option,\n238\t canary_latency_ms: Option,\n239\t canary_assertion_failures_total: Option,\n240\t\n241\t // ── §13.19 Admin UI metrics (feature-gated) ──\n242\t admin_ui_sessions_total: Option,\n243\t admin_ui_action_total: Option,\n244\t admin_ui_destructive_action_total: Option,\n245\t\n246\t // ── §13.20 Explain metrics (feature-gated) ──\n247\t explain_requests_total: Option,\n248\t explain_warnings_total: Option,\n249\t explain_execute_total: Option,\n250\t\n251\t // ── §13.21 Search UI metrics (feature-gated) ──\n252\t search_ui_sessions_total: Option,\n253\t search_ui_queries_total: Option,\n254\t search_ui_zero_hits_total: Option,\n255\t search_ui_click_through_total: Option,\n256\t search_ui_p95_ms: Option,\n257\t\n258\t // ── §14.9 Resource-pressure metrics (always present) ──\n259\t memory_pressure: Gauge,\n260\t cpu_throttled_seconds_total: Counter,\n261\t request_queue_depth: Gauge,\n262\t background_queue_depth: GaugeVec,\n263\t peer_pod_count: Gauge,\n264\t leader: Gauge,\n265\t owned_shards_count: Gauge,\n266\t\n267\t // ── Admin session sealing metrics (always present) ──\n268\t admin_session_key_generated: Gauge,\n269\t admin_session_revoked_total: Counter,\n270\t\n271\t // ── §13.5 Two-phase settings broadcast metrics (always present) ──\n272\t settings_broadcast_phase: GaugeVec,\n273\t settings_hash_mismatch_total: Counter,\n274\t settings_drift_repair_total: CounterVec,\n275\t settings_version: GaugeVec,\n276\t\n277\t // ── §13.7 Alias metrics (always present) ──\n278\t alias_resolutions_total: CounterVec,\n279\t alias_flips_total: CounterVec,\n280\t\n281\t // ── §13.6 Session pinning metrics (always present) ──\n282\t session_active_count: Gauge,\n283\t session_pin_enforced_total: CounterVec,\n284\t session_wait_duration_seconds: Histogram,\n285\t session_wait_timeout_total: CounterVec,\n286\t}\n287\t\n288\timpl Clone for Metrics {\n289\t fn clone(&self) -> Self {\n290\t Self {\n291\t registry: self.registry.clone(),\n292\t request_duration: self.request_duration.clone(),\n293\t requests_total: self.requests_total.clone(),\n294\t requests_in_flight: self.requests_in_flight.clone(),\n295\t node_healthy: self.node_healthy.clone(),\n296\t node_request_duration: self.node_request_duration.clone(),\n297\t node_errors: self.node_errors.clone(),\n298\t shard_coverage: self.shard_coverage.clone(),\n299\t degraded_shards: self.degraded_shards.clone(),\n300\t shard_distribution: self.shard_distribution.clone(),\n301\t task_processing_age: self.task_processing_age.clone(),\n302\t tasks_total: self.tasks_total.clone(),\n303\t task_registry_size: self.task_registry_size.clone(),\n304\t scatter_fan_out_size: self.scatter_fan_out_size.clone(),\n305\t scatter_partial_responses: self.scatter_partial_responses.clone(),\n306\t scatter_retries: self.scatter_retries.clone(),\n307\t rebalance_in_progress: self.rebalance_in_progress.clone(),\n308\t rebalance_documents_migrated: self.rebalance_documents_migrated.clone(),\n309\t rebalance_duration: self.rebalance_duration.clone(),\n310\t multisearch_queries_per_batch: self.multisearch_queries_per_batch.clone(),\n311\t multisearch_batches_total: self.multisearch_batches_total.clone(),\n312\t multisearch_partial_failures_total: self.multisearch_partial_failures_total.clone(),\n313\t multisearch_tenant_session_pin_override_total: self.multisearch_tenant_session_pin_override_total.clone(),\n314\t vector_search_over_fetched_total: self.vector_search_over_fetched_total.clone(),\n315\t vector_merge_strategy: self.vector_merge_strategy.clone(),\n316\t vector_embedder_drift_total: self.vector_embedder_drift_total.clone(),\n317\t cdc_events_published_total: self.cdc_events_published_total.clone(),\n318\t cdc_lag_seconds: self.cdc_lag_seconds.clone(),\n319\t cdc_buffer_bytes: self.cdc_buffer_bytes.clone(),\n320\t cdc_dropped_total: self.cdc_dropped_total.clone(),\n321\t cdc_events_suppressed_total: self.cdc_events_suppressed_total.clone(),\n322\t ttl_documents_expired_total: self.ttl_documents_expired_total.clone(),\n323\t ttl_sweep_duration_seconds: self.ttl_sweep_duration_seconds.clone(),\n324\t ttl_pending_estimate: self.ttl_pending_estimate.clone(),\n325\t tenant_queries_total: self.tenant_queries_total.clone(),\n326\t tenant_pinned_groups: self.tenant_pinned_groups.clone(),\n327\t tenant_fallback_total: self.tenant_fallback_total.clone(),\n328\t shadow_diff_total: self.shadow_diff_total.clone(),\n329\t shadow_kendall_tau: self.shadow_kendall_tau.clone(),\n330\t shadow_latency_delta_seconds: self.shadow_latency_delta_seconds.clone(),\n331\t shadow_errors_total: self.shadow_errors_total.clone(),\n332\t rollover_events_total: self.rollover_events_total.clone(),\n333\t rollover_active_indexes: self.rollover_active_indexes.clone(),\n334\t rollover_documents_expired_total: self.rollover_documents_expired_total.clone(),\n335\t rollover_last_action_seconds: self.rollover_last_action_seconds.clone(),\n336\t canary_runs_total: self.canary_runs_total.clone(),\n337\t canary_latency_ms: self.canary_latency_ms.clone(),\n338\t canary_assertion_failures_total: self.canary_assertion_failures_total.clone(),\n339\t admin_ui_sessions_total: self.admin_ui_sessions_total.clone(),\n340\t admin_ui_action_total: self.admin_ui_action_total.clone(),\n341\t admin_ui_destructive_action_total: self.admin_ui_destructive_action_total.clone(),\n342\t explain_requests_total: self.explain_requests_total.clone(),\n343\t explain_warnings_total: self.explain_warnings_total.clone(),\n344\t explain_execute_total: self.explain_execute_total.clone(),\n345\t search_ui_sessions_total: self.search_ui_sessions_total.clone(),\n346\t search_ui_queries_total: self.search_ui_queries_total.clone(),\n347\t search_ui_zero_hits_total: self.search_ui_zero_hits_total.clone(),\n348\t search_ui_click_through_total: self.search_ui_click_through_total.clone(),\n349\t search_ui_p95_ms: self.search_ui_p95_ms.clone(),\n350\t memory_pressure: self.memory_pressure.clone(),\n351\t cpu_throttled_seconds_total: self.cpu_throttled_seconds_total.clone(),\n352\t request_queue_depth: self.request_queue_depth.clone(),\n353\t background_queue_depth: self.background_queue_depth.clone(),\n354\t peer_pod_count: self.peer_pod_count.clone(),\n355\t leader: self.leader.clone(),\n356\t owned_shards_count: self.owned_shards_count.clone(),\n357\t admin_session_key_generated: self.admin_session_key_generated.clone(),\n358\t admin_session_revoked_total: self.admin_session_revoked_total.clone(),\n359\t settings_broadcast_phase: self.settings_broadcast_phase.clone(),\n360\t settings_hash_mismatch_total: self.settings_hash_mismatch_total.clone(),\n361\t settings_drift_repair_total: self.settings_drift_repair_total.clone(),\n362\t settings_version: self.settings_version.clone(),\n363\t alias_resolutions_total: self.alias_resolutions_total.clone(),\n364\t alias_flips_total: self.alias_flips_total.clone(),\n365\t session_active_count: self.session_active_count.clone(),\n366\t session_pin_enforced_total: self.session_pin_enforced_total.clone(),\n367\t session_wait_duration_seconds: self.session_wait_duration_seconds.clone(),\n368\t session_wait_timeout_total: self.session_wait_timeout_total.clone(),\n369\t }\n370\t }\n371\t}\n372\t\n373\timpl Default for Metrics {\n374\t fn default() -> Self {\n375\t Self::new(&MiroirConfig::default())\n376\t }\n377\t}\n378\t\n379\timpl Metrics {\n380\t pub fn new(config: &MiroirConfig) -> Self {\n381\t let registry = Registry::new();\n382\t\n383\t // ── Request metrics ──\n384\t let request_duration = HistogramVec::new(\n385\t HistogramOpts::new(\"miroir_request_duration_seconds\", \"Request latency in seconds\")\n386\t .buckets(vec![0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0, 10.0]),\n387\t &[\"method\", \"path_template\", \"status\"],\n388\t )\n389\t .expect(\"failed to create request_duration histogram\");\n390\t\n391\t let requests_total = CounterVec::new(\n392\t Opts::new(\"miroir_requests_total\", \"Total number of requests\"),\n393\t &[\"method\", \"path_template\", \"status\"],\n394\t )\n395\t .expect(\"failed to create requests_total counter\");\n396\t\n397\t let requests_in_flight = Gauge::with_opts(\n398\t Opts::new(\"miroir_requests_in_flight\", \"Number of requests currently being processed\"),\n399\t )\n400\t .expect(\"failed to create requests_in_flight gauge\");\n401\t\n402\t // ── Node health metrics ──\n403\t let node_healthy = GaugeVec::new(\n404\t Opts::new(\"miroir_node_healthy\", \"Health status of backend nodes (1=healthy, 0=unhealthy)\"),\n405\t &[\"node_id\"],\n406\t )\n407\t .expect(\"failed to create node_healthy gauge\");\n408\t\n409\t let node_request_duration = HistogramVec::new(\n410\t HistogramOpts::new(\"miroir_node_request_duration_seconds\", \"Latency of individual node requests\")\n411\t .buckets(vec![0.001, 0.005, 0.01, 0.025, 0.05, 0.1, 0.5, 1.0]),\n412\t &[\"node_id\", \"operation\"],\n413\t )\n414\t .expect(\"failed to create node_request_duration histogram\");\n415\t\n416\t let node_errors = CounterVec::new(\n417\t Opts::new(\"miroir_node_errors_total\", \"Number of errors from backend nodes\"),\n418\t &[\"node_id\", \"error_type\"],\n419\t )\n420\t .expect(\"failed to create node_errors counter\");\n421\t\n422\t // ── Shard metrics ──\n423\t let shard_coverage = Gauge::with_opts(\n424\t Opts::new(\"miroir_shard_coverage\", \"Fraction of shards with at least one healthy replica\"),\n425\t )\n426\t .expect(\"failed to create shard_coverage gauge\");\n427\t\n428\t let degraded_shards = Gauge::with_opts(\n429\t Opts::new(\"miroir_degraded_shards_total\", \"Number of shards with reduced replica availability\"),\n430\t )\n431\t .expect(\"failed to create degraded_shards gauge\");\n432\t\n433\t let shard_distribution = GaugeVec::new(\n434\t Opts::new(\"miroir_shard_distribution\", \"Number of shards assigned to each node\"),\n435\t &[\"node_id\"],\n436\t )\n437\t .expect(\"failed to create shard_distribution gauge\");\n438\t\n439\t // ── Task metrics ──\n440\t let task_processing_age = Histogram::with_opts(\n441\t HistogramOpts::new(\"miroir_task_processing_age_seconds\", \"Time between task creation and processing start\")\n442\t .buckets(vec![0.01, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0, 10.0, 30.0, 60.0]),\n443\t )\n444\t .expect(\"failed to create task_processing_age histogram\");\n445\t\n446\t let tasks_total = CounterVec::new(\n447\t Opts::new(\"miroir_tasks_total\", \"Total number of tasks by status\"),\n448\t &[\"status\"],\n449\t )\n450\t .expect(\"failed to create tasks_total counter\");\n451\t\n452\t let task_registry_size = Gauge::with_opts(\n453\t Opts::new(\"miroir_task_registry_size\", \"Current number of tasks in the registry\"),\n454\t )\n455\t .expect(\"failed to create task_registry_size gauge\");\n456\t\n457\t // ── Scatter-gather metrics ──\n458\t let scatter_fan_out_size = Histogram::with_opts(\n459\t HistogramOpts::new(\"miroir_scatter_fan_out_size\", \"Number of nodes in scatter operations\")\n460\t .buckets(vec![1.0, 2.0, 3.0, 5.0, 10.0, 20.0, 50.0]),\n461\t )\n462\t .expect(\"failed to create scatter_fan_out_size histogram\");\n463\t\n464\t let scatter_partial_responses = Counter::with_opts(\n465\t Opts::new(\"miroir_scatter_partial_responses_total\", \"Number of scatter responses that were partial (some nodes failed)\"),\n466\t )\n467\t .expect(\"failed to create scatter_partial_responses counter\");\n468\t\n469\t let scatter_retries = Counter::with_opts(\n470\t Opts::new(\"miroir_scatter_retries_total\", \"Number of scatter retry attempts due to node failures\"),\n471\t )\n472\t .expect(\"failed to create scatter_retries counter\");\n473\t\n474\t // ── Rebalancer metrics ──\n475\t let rebalance_in_progress = Gauge::with_opts(\n476\t Opts::new(\"miroir_rebalance_in_progress\", \"Whether a rebalance is currently running (1=yes, 0=no)\"),\n477\t )\n478\t .expect(\"failed to create rebalance_in_progress gauge\");\n479\t\n480\t let rebalance_documents_migrated = Counter::with_opts(\n481\t Opts::new(\"miroir_rebalance_documents_migrated_total\", \"Total number of documents migrated during rebalance\"),\n482\t )\n483\t .expect(\"failed to create rebalance_documents_migrated counter\");\n484\t\n485\t let rebalance_duration = Histogram::with_opts(\n486\t HistogramOpts::new(\"miroir_rebalance_duration_seconds\", \"Duration of rebalance operations\")\n487\t .buckets(vec![1.0, 5.0, 10.0, 30.0, 60.0, 300.0, 600.0, 1800.0, 3600.0]),\n488\t )\n489\t .expect(\"failed to create rebalance_duration histogram\");\n490\t\n491\t // Register all metrics\n492\t macro_rules! reg {\n493\t ($m:expr) => {\n494\t registry.register(Box::new($m.clone())).expect(concat!(\"failed to register \", stringify!($m)));\n495\t };\n496\t }\n497\t\n498\t reg!(request_duration);\n499\t reg!(requests_total);\n500\t reg!(requests_in_flight);\n501\t reg!(node_healthy);\n502\t reg!(node_request_duration);\n503\t reg!(node_errors);\n504\t reg!(shard_coverage);\n505\t reg!(degraded_shards);\n506\t reg!(shard_distribution);\n507\t reg!(task_processing_age);\n508\t reg!(tasks_total);\n509\t reg!(task_registry_size);\n510\t reg!(scatter_fan_out_size);\n511\t reg!(scatter_partial_responses);\n512\t reg!(scatter_retries);\n513\t reg!(rebalance_in_progress);\n514\t reg!(rebalance_documents_migrated);\n515\t reg!(rebalance_duration);\n516\t\n517\t // ── §13.11 Multi-search metrics (cardinality cap: top 100 tenants, rest bucketed) ──\n518\t let (\n519\t multisearch_queries_per_batch,\n520\t multisearch_batches_total,\n521\t multisearch_partial_failures_total,\n522\t multisearch_tenant_session_pin_override_total,\n523\t ) = if config.multi_search.enabled {\n524\t let q = Histogram::with_opts(\n525\t HistogramOpts::new(\"miroir_multisearch_queries_per_batch\", \"Number of queries in each multi-search batch\")\n526\t .buckets(vec![1.0, 2.0, 5.0, 10.0, 25.0, 50.0, 100.0]),\n527\t ).expect(\"create multisearch_queries_per_batch\");\n528\t let b = Counter::with_opts(\n529\t Opts::new(\"miroir_multisearch_batches_total\", \"Total number of multi-search batches processed\"),\n530\t ).expect(\"create multisearch_batches_total\");\n531\t let p = Counter::with_opts(\n532\t Opts::new(\"miroir_multisearch_partial_failures_total\", \"Number of multi-search batches with at least one query failure\"),\n533\t ).expect(\"create multisearch_partial_failures_total\");\n534\t let t = CounterVec::new(\n535\t Opts::new(\"miroir_tenant_session_pin_override_total\", \"Session pin overrides triggered by multi-search tenant routing\"),\n536\t &[\"tenant\"],\n537\t ).expect(\"create multisearch_tenant_session_pin_override_total\");\n538\t reg!(q); reg!(b); reg!(p); reg!(t);\n539\t (Some(q), Some(b), Some(p), Some(t))\n540\t } else {\n541\t (None, None, None, None)\n542\t };\n543\t\n544\t // ── §13.12 Vector search metrics ──\n545\t let (\n546\t vector_search_over_fetched_total,\n547\t vector_merge_strategy,\n548\t vector_embedder_drift_total,\n549\t ) = if config.vector_search.enabled {\n550\t let o = Counter::with_opts(\n551\t Opts::new(\"miroir_vector_search_over_fetched_total\", \"Number of vector searches that over-fetched candidates\"),\n552\t ).expect(\"create vector_search_over_fetched_total\");\n553\t let m = CounterVec::new(\n554\t Opts::new(\"miroir_vector_merge_strategy\", \"Count of hybrid merge strategy selections\"),\n555\t &[\"strategy\"],\n556\t ).expect(\"create vector_merge_strategy\");\n557\t let d = Counter::with_opts(\n558\t Opts::new(\"miroir_vector_embedder_drift_total\", \"Number of embedder drift detections\"),\n559\t ).expect(\"create vector_embedder_drift_total\");\n560\t reg!(o); reg!(m); reg!(d);\n561\t (Some(o), Some(m), Some(d))\n562\t } else {\n563\t (None, None, None)\n564\t };\n565\t\n566\t // ── §13.13 CDC metrics (cardinality cap: top 100 sinks, rest bucketed) ──\n567\t let (\n568\t cdc_events_published_total,\n569\t cdc_lag_seconds,\n570\t cdc_buffer_bytes,\n571\t cdc_dropped_total,\n572\t cdc_events_suppressed_total,\n573\t ) = if config.cdc.enabled {\n574\t let e = CounterVec::new(\n575\t Opts::new(\"miroir_cdc_events_published_total\", \"Total CDC events published\"),\n576\t &[\"sink\", \"index\"],\n577\t ).expect(\"create cdc_events_published_total\");\n578\t let l = GaugeVec::new(\n579\t Opts::new(\"miroir_cdc_lag_seconds\", \"CDC delivery lag in seconds\"),\n580\t &[\"sink\"],\n581\t ).expect(\"create cdc_lag_seconds\");\n582\t let b = GaugeVec::new(\n583\t Opts::new(\"miroir_cdc_buffer_bytes\", \"CDC buffer size in bytes\"),\n584\t &[\"sink\"],\n585\t ).expect(\"create cdc_buffer_bytes\");\n586\t let d = CounterVec::new(\n587\t Opts::new(\"miroir_cdc_dropped_total\", \"CDC events dropped due to buffer overflow\"),\n588\t &[\"sink\"],\n589\t ).expect(\"create cdc_dropped_total\");\n590\t let s = CounterVec::new(\n591\t Opts::new(\"miroir_cdc_events_suppressed_total\", \"CDC events suppressed by origin deduplication\"),\n592\t &[\"origin\"],\n593\t ).expect(\"create cdc_events_suppressed_total\");\n594\t reg!(e); reg!(l); reg!(b); reg!(d); reg!(s);\n595\t (Some(e), Some(l), Some(b), Some(d), Some(s))\n596\t } else {\n597\t (None, None, None, None, None)\n598\t };\n599\t\n600\t // ── §13.14 TTL metrics (cardinality cap: top 100 indexes, rest bucketed) ──\n601\t let (\n602\t ttl_documents_expired_total,\n603\t ttl_sweep_duration_seconds,\n604\t ttl_pending_estimate,\n605\t ) = if config.ttl.enabled {\n606\t let e = CounterVec::new(\n607\t Opts::new(\"miroir_ttl_documents_expired_total\", \"Documents expired by TTL sweeper\"),\n608\t &[\"index\"],\n609\t ).expect(\"create ttl_documents_expired_total\");\n610\t let d = HistogramVec::new(\n611\t HistogramOpts::new(\"miroir_ttl_sweep_duration_seconds\", \"Duration of TTL sweep cycles\")\n612\t .buckets(vec![0.01, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0, 10.0]),\n613\t &[\"index\"],\n614\t ).expect(\"create ttl_sweep_duration_seconds\");\n615\t let p = GaugeVec::new(\n616\t Opts::new(\"miroir_ttl_pending_estimate\", \"Estimated documents pending TTL expiry\"),\n617\t &[\"index\"],\n618\t ).expect(\"create ttl_pending_estimate\");\n619\t reg!(e); reg!(d); reg!(p);\n620\t (Some(e), Some(d), Some(p))\n621\t } else {\n622\t (None, None, None)\n623\t };\n624\t\n625\t // ── §13.15 Tenant affinity metrics (cardinality cap: top 100 tenants, rest bucketed) ──\n626\t let (\n627\t tenant_queries_total,\n628\t tenant_pinned_groups,\n629\t tenant_fallback_total,\n630\t ) = if config.tenant_affinity.enabled {\n631\t let q = CounterVec::new(\n632\t Opts::new(\"miroir_tenant_queries_total\", \"Queries routed per tenant and group\"),\n633\t &[\"tenant\", \"group\"],\n634\t ).expect(\"create tenant_queries_total\");\n635\t let p = GaugeVec::new(\n636\t Opts::new(\"miroir_tenant_pinned_groups\", \"Current pinned group per tenant\"),\n637\t &[\"tenant\"],\n638\t ).expect(\"create tenant_pinned_groups\");\n639\t let f = CounterVec::new(\n640\t Opts::new(\"miroir_tenant_fallback_total\", \"Tenant affinity fallback invocations\"),\n641\t &[\"reason\"],\n642\t ).expect(\"create tenant_fallback_total\");\n643\t reg!(q); reg!(p); reg!(f);\n644\t (Some(q), Some(p), Some(f))\n645\t } else {\n646\t (None, None, None)\n647\t };\n648\t\n649\t // ── §13.16 Shadow traffic metrics ──\n650\t let (\n651\t shadow_diff_total,\n652\t shadow_kendall_tau,\n653\t shadow_latency_delta_seconds,\n654\t shadow_errors_total,\n655\t ) = if config.shadow.enabled {\n656\t let d = CounterVec::new(\n657\t Opts::new(\"miroir_shadow_diff_total\", \"Shadow comparison diffs by kind\"),\n658\t &[\"kind\"],\n659\t ).expect(\"create shadow_diff_total\");\n660\t let k = Gauge::with_opts(\n661\t Opts::new(\"miroir_shadow_kendall_tau\", \"Kendall tau rank correlation between shadow and primary\"),\n662\t ).expect(\"create shadow_kendall_tau\");\n663\t let l = Histogram::with_opts(\n664\t HistogramOpts::new(\"miroir_shadow_latency_delta_seconds\", \"Latency difference between shadow and primary\")\n665\t .buckets(vec![-1.0, -0.5, -0.1, -0.01, 0.0, 0.01, 0.1, 0.5, 1.0]),\n666\t ).expect(\"create shadow_latency_delta_seconds\");\n667\t let e = CounterVec::new(\n668\t Opts::new(\"miroir_shadow_errors_total\", \"Shadow pipeline errors\"),\n669\t &[\"target\", \"side\"],\n670\t ).expect(\"create shadow_errors_total\");\n671\t reg!(d); reg!(k); reg!(l); reg!(e);\n672\t (Some(d), Some(k), Some(l), Some(e))\n673\t } else {\n674\t (None, None, None, None)\n675\t };\n676\t\n677\t // ── §13.17 ILM metrics (cardinality cap: top 100 policies/aliases, rest bucketed) ──\n678\t let (\n679\t rollover_events_total,\n680\t rollover_active_indexes,\n681\t rollover_documents_expired_total,\n682\t rollover_last_action_seconds,\n683\t ) = if config.ilm.enabled {\n684\t let e = CounterVec::new(\n685\t Opts::new(\"miroir_rollover_events_total\", \"ILM rollover events\"),\n686\t &[\"policy\"],\n687\t ).expect(\"create rollover_events_total\");\n688\t let a = GaugeVec::new(\n689\t Opts::new(\"miroir_rollover_active_indexes\", \"Active write indexes per alias\"),\n690\t &[\"alias\"],\n691\t ).expect(\"create rollover_active_indexes\");\n692\t let d = CounterVec::new(\n693\t Opts::new(\"miroir_rollover_documents_expired_total\", \"Documents expired by ILM retention policies\"),\n694\t &[\"policy\"],\n695\t ).expect(\"create rollover_documents_expired_total\");\n696\t let l = GaugeVec::new(\n697\t Opts::new(\"miroir_rollover_last_action_seconds\", \"Seconds since last rollover action per policy\"),\n698\t &[\"policy\"],\n699\t ).expect(\"create rollover_last_action_seconds\");\n700\t reg!(e); reg!(a); reg!(d); reg!(l);\n701\t (Some(e), Some(a), Some(d), Some(l))\n702\t } else {\n703\t (None, None, None, None)\n704\t };\n705\t\n706\t // ── §13.18 Canary metrics (cardinality cap: top 100 canaries, rest bucketed) ──\n707\t let (\n708\t canary_runs_total,\n709\t canary_latency_ms,\n710\t canary_assertion_failures_total,\n711\t ) = if config.canary_runner.enabled {\n712\t let r = CounterVec::new(\n713\t Opts::new(\"miroir_canary_runs_total\", \"Canary run results\"),\n714\t &[\"canary\", \"result\"],\n715\t ).expect(\"create canary_runs_total\");\n716\t let l = HistogramVec::new(\n717\t HistogramOpts::new(\"miroir_canary_latency_ms\", \"Canary execution latency\")\n718\t .buckets(vec![1.0, 5.0, 10.0, 25.0, 50.0, 100.0, 250.0, 500.0, 1000.0]),\n719\t &[\"canary\"],\n720\t ).expect(\"create canary_latency_ms\");\n721\t let a = CounterVec::new(\n722\t Opts::new(\"miroir_canary_assertion_failures_total\", \"Canary assertion failures\"),\n723\t &[\"canary\", \"assertion_type\"],\n724\t ).expect(\"create canary_assertion_failures_total\");\n725\t reg!(r); reg!(l); reg!(a);\n726\t (Some(r), Some(l), Some(a))\n727\t } else {\n728\t (None, None, None)\n729\t };\n730\t\n731\t // ── §13.19 Admin UI metrics ──\n732\t let (\n733\t admin_ui_sessions_total,\n734\t admin_ui_action_total,\n735\t admin_ui_destructive_action_total,\n736\t ) = if config.admin_ui.enabled {\n737\t let s = Counter::with_opts(\n738\t Opts::new(\"miroir_admin_ui_sessions_total\", \"Admin UI sessions started\"),\n739\t ).expect(\"create admin_ui_sessions_total\");\n740\t let a = CounterVec::new(\n741\t Opts::new(\"miroir_admin_ui_action_total\", \"Admin UI actions by type\"),\n742\t &[\"action\"],\n743\t ).expect(\"create admin_ui_action_total\");\n744\t let d = CounterVec::new(\n745\t Opts::new(\"miroir_admin_ui_destructive_action_total\", \"Admin UI destructive actions (delete, drop, etc.)\"),\n746\t &[\"action\"],\n747\t ).expect(\"create admin_ui_destructive_action_total\");\n748\t reg!(s); reg!(a); reg!(d);\n749\t (Some(s), Some(a), Some(d))\n750\t } else {\n751\t (None, None, None)\n752\t };\n753\t\n754\t // ── §13.20 Explain metrics ──\n755\t let (\n756\t explain_requests_total,\n757\t explain_warnings_total,\n758\t explain_execute_total,\n759\t ) = if config.explain.enabled {\n760\t let r = Counter::with_opts(\n761\t Opts::new(\"miroir_explain_requests_total\", \"Explain API requests\"),\n762\t ).expect(\"create explain_requests_total\");\n763\t let w = CounterVec::new(\n764\t Opts::new(\"miroir_explain_warnings_total\", \"Explain warnings by type\"),\n765\t &[\"warning_type\"],\n766\t ).expect(\"create explain_warnings_total\");\n767\t let e = Counter::with_opts(\n768\t Opts::new(\"miroir_explain_execute_total\", \"Explain requests with execute=true\"),\n769\t ).expect(\"create explain_execute_total\");\n770\t reg!(r); reg!(w); reg!(e);\n771\t (Some(r), Some(w), Some(e))\n772\t } else {\n773\t (None, None, None)\n774\t };\n775\t\n776\t // ── §13.21 Search UI metrics (cardinality cap: top 100 indexes, rest bucketed) ──\n777\t let (\n778\t search_ui_sessions_total,\n779\t search_ui_queries_total,\n780\t search_ui_zero_hits_total,\n781\t search_ui_click_through_total,\n782\t search_ui_p95_ms,\n783\t ) = if config.search_ui.enabled {\n784\t let s = Counter::with_opts(\n785\t Opts::new(\"miroir_search_ui_sessions_total\", \"Search UI sessions\"),\n786\t ).expect(\"create search_ui_sessions_total\");\n787\t let q = CounterVec::new(\n788\t Opts::new(\"miroir_search_ui_queries_total\", \"Search UI queries per index\"),\n789\t &[\"index\"],\n790\t ).expect(\"create search_ui_queries_total\");\n791\t let z = CounterVec::new(\n792\t Opts::new(\"miroir_search_ui_zero_hits_total\", \"Search UI zero-hit queries per index\"),\n793\t &[\"index\"],\n794\t ).expect(\"create search_ui_zero_hits_total\");\n795\t let c = CounterVec::new(\n796\t Opts::new(\"miroir_search_ui_click_through_total\", \"Search UI click-through events per index\"),\n797\t &[\"index\"],\n798\t ).expect(\"create search_ui_click_through_total\");\n799\t let p = GaugeVec::new(\n800\t Opts::new(\"miroir_search_ui_p95_ms\", \"Search UI p95 query latency per index\"),\n801\t &[\"index\"],\n802\t ).expect(\"create search_ui_p95_ms\");\n803\t reg!(s); reg!(q); reg!(z); reg!(c); reg!(p);\n804\t (Some(s), Some(q), Some(z), Some(c), Some(p))\n805\t } else {\n806\t (None, None, None, None, None)\n807\t };\n808\t\n809\t // ── §14.9 Resource-pressure metrics (always present) ──\n810\t let memory_pressure = Gauge::with_opts(\n811\t Opts::new(\"miroir_memory_pressure\", \"Memory pressure level (0=none, 1=low, 2=moderate/high)\")\n812\t ).expect(\"create memory_pressure\");\n813\t let cpu_throttled_seconds_total = Counter::with_opts(\n814\t Opts::new(\"miroir_cpu_throttled_seconds_total\", \"Total seconds of CPU throttling\")\n815\t ).expect(\"create cpu_throttled_seconds_total\");\n816\t let request_queue_depth = Gauge::with_opts(\n817\t Opts::new(\"miroir_request_queue_depth\", \"Number of requests queued waiting for processing\")\n818\t ).expect(\"create request_queue_depth\");\n819\t let background_queue_depth = GaugeVec::new(\n820\t Opts::new(\"miroir_background_queue_depth\", \"Number of background jobs queued by type\"),\n821\t &[\"job_type\"],\n822\t ).expect(\"create background_queue_depth\");\n823\t let peer_pod_count = Gauge::with_opts(\n824\t Opts::new(\"miroir_peer_pod_count\", \"Number of peer miroir pods discovered\")\n825\t ).expect(\"create peer_pod_count\");\n826\t let leader = Gauge::with_opts(\n827\t Opts::new(\"miroir_leader\", \"Whether this pod holds the leader lease (1=yes, 0=no)\")\n828\t ).expect(\"create leader\");\n829\t let owned_shards_count = Gauge::with_opts(\n830\t Opts::new(\"miroir_owned_shards_count\", \"Number of shards owned by this pod\")\n831\t ).expect(\"create owned_shards_count\");\n832\t reg!(memory_pressure);\n833\t reg!(cpu_throttled_seconds_total);\n834\t reg!(request_queue_depth);\n835\t reg!(background_queue_depth);\n836\t reg!(peer_pod_count);\n837\t reg!(leader);\n838\t reg!(owned_shards_count);\n839\t\n840\t // ── Admin session sealing metrics (always present) ──\n841\t let admin_session_key_generated = Gauge::with_opts(\n842\t Opts::new(\"miroir_admin_session_key_generated\",\n843\t \"Whether ADMIN_SESSION_SEAL_KEY was generated at startup (1=yes, 0=set via env)\")\n844\t ).expect(\"create admin_session_key_generated\");\n845\t let admin_session_revoked_total = Counter::with_opts(\n846\t Opts::new(\"miroir_admin_session_revoked_total\",\n847\t \"Admin sessions revoked via logout\")\n848\t ).expect(\"create admin_session_revoked_total\");\n849\t reg!(admin_session_key_generated);\n850\t reg!(admin_session_revoked_total);\n851\t\n852\t // ── §13.5 Two-phase settings broadcast metrics (always present) ──\n853\t let settings_broadcast_phase = GaugeVec::new(\n854\t Opts::new(\"miroir_settings_broadcast_phase\", \"Current phase of settings broadcast (0=idle, 1=propose, 2=verify, 3=commit)\"),\n855\t &[\"index\"],\n856\t ).expect(\"create settings_broadcast_phase\");\n857\t let settings_hash_mismatch_total = Counter::with_opts(\n858\t Opts::new(\"miroir_settings_hash_mismatch_total\", \"Settings hash mismatches detected during verify phase\"),\n859\t ).expect(\"create settings_hash_mismatch_total\");\n860\t let settings_drift_repair_total = CounterVec::new(\n861\t Opts::new(\"miroir_settings_drift_repair_total\", \"Settings drift repairs performed by drift reconciler\"),\n862\t &[\"index\"],\n863\t ).expect(\"create settings_drift_repair_total\");\n864\t let settings_version = GaugeVec::new(\n865\t Opts::new(\"miroir_settings_version\", \"Current settings version per index\"),\n866\t &[\"index\"],\n867\t ).expect(\"create settings_version\");\n868\t reg!(settings_broadcast_phase);\n869\t reg!(settings_hash_mismatch_total);\n870\t reg!(settings_drift_repair_total);\n871\t reg!(settings_version);\n872\t\n873\t // ── §13.7 Alias metrics (always present) ──\n874\t let alias_resolutions_total = CounterVec::new(\n875\t Opts::new(\"miroir_alias_resolutions_total\", \"Number of alias resolutions\"),\n876\t &[\"alias\"],\n877\t ).expect(\"create alias_resolutions_total\");\n878\t let alias_flips_total = CounterVec::new(\n879\t Opts::new(\"miroir_alias_flips_total\", \"Number of alias flips\"),\n880\t &[\"alias\"],\n881\t ).expect(\"create alias_flips_total\");\n882\t reg!(alias_resolutions_total);\n883\t reg!(alias_flips_total);\n884\t\n885\t // ── §13.6 Session pinning metrics (always present) ──\n886\t let session_active_count = Gauge::new(\n887\t \"miroir_session_active_count\",\n888\t \"Number of active sessions\",\n889\t ).expect(\"create session_active_count\");\n890\t let session_pin_enforced_total = CounterVec::new(\n891\t Opts::new(\"miroir_session_pin_enforced_total\", \"Number of times session pin was enforced\"),\n892\t &[\"strategy\"],\n893\t ).expect(\"create session_pin_enforced_total\");\n894\t let session_wait_duration_seconds = Histogram::with_opts(\n895\t HistogramOpts::new(\n896\t \"miroir_session_wait_duration_seconds\",\n897\t \"Duration of session pin wait operations\",\n898\t )\n899\t .buckets(vec![0.001, 0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0]),\n900\t ).expect(\"create session_wait_duration_seconds\");\n901\t let session_wait_timeout_total = CounterVec::new(\n902\t Opts::new(\"miroir_session_wait_timeout_total\", \"Number of session pin wait timeouts\"),\n903\t &[\"strategy\"],\n904\t ).expect(\"create session_wait_timeout_total\");\n905\t reg!(session_active_count);\n906\t reg!(session_pin_enforced_total);\n907\t reg!(session_wait_duration_seconds);\n908\t reg!(session_wait_timeout_total);\n909\t\n910\t Self {\n911\t registry,\n912\t request_duration,\n913\t requests_total,\n914\t requests_in_flight,\n915\t node_healthy,\n916\t node_request_duration,\n917\t node_errors,\n918\t shard_coverage,\n919\t degraded_shards,\n920\t shard_distribution,\n921\t task_processing_age,\n922\t tasks_total,\n923\t task_registry_size,\n924\t scatter_fan_out_size,\n925\t scatter_partial_responses,\n926\t scatter_retries,\n927\t rebalance_in_progress,\n928\t rebalance_documents_migrated,\n929\t rebalance_duration,\n930\t multisearch_queries_per_batch,\n931\t multisearch_batches_total,\n932\t multisearch_partial_failures_total,\n933\t multisearch_tenant_session_pin_override_total,\n934\t vector_search_over_fetched_total,\n935\t vector_merge_strategy,\n936\t vector_embedder_drift_total,\n937\t cdc_events_published_total,\n938\t cdc_lag_seconds,\n939\t cdc_buffer_bytes,\n940\t cdc_dropped_total,\n941\t cdc_events_suppressed_total,\n942\t ttl_documents_expired_total,\n943\t ttl_sweep_duration_seconds,\n944\t ttl_pending_estimate,\n945\t tenant_queries_total,\n946\t tenant_pinned_groups,\n947\t tenant_fallback_total,\n948\t shadow_diff_total,\n949\t shadow_kendall_tau,\n950\t shadow_latency_delta_seconds,\n951\t shadow_errors_total,\n952\t rollover_events_total,\n953\t rollover_active_indexes,\n954\t rollover_documents_expired_total,\n955\t rollover_last_action_seconds,\n956\t canary_runs_total,\n957\t canary_latency_ms,\n958\t canary_assertion_failures_total,\n959\t admin_ui_sessions_total,\n960\t admin_ui_action_total,\n961\t admin_ui_destructive_action_total,\n962\t explain_requests_total,\n963\t explain_warnings_total,\n964\t explain_execute_total,\n965\t search_ui_sessions_total,\n966\t search_ui_queries_total,\n967\t search_ui_zero_hits_total,\n968\t search_ui_click_through_total,\n969\t search_ui_p95_ms,\n970\t memory_pressure,\n971\t cpu_throttled_seconds_total,\n972\t request_queue_depth,\n973\t background_queue_depth,\n974\t peer_pod_count,\n975\t leader,\n976\t owned_shards_count,\n977\t admin_session_key_generated,\n978\t admin_session_revoked_total,\n979\t settings_broadcast_phase,\n980\t settings_hash_mismatch_total,\n981\t settings_drift_repair_total,\n982\t settings_version,\n983\t alias_resolutions_total,\n984\t alias_flips_total,\n985\t session_active_count,\n986\t session_pin_enforced_total,\n987\t session_wait_duration_seconds,\n988\t session_wait_timeout_total,\n989\t }\n990\t }\n991\t\n992\t pub fn encode_metrics(&self) -> Result {\n993\t let encoder = TextEncoder::new();\n994\t let metric_families = self.registry.gather();\n995\t let mut buffer = Vec::new();\n996\t encoder.encode(&metric_families, &mut buffer)?;\n997\t Ok(String::from_utf8(buffer).map_err(|e| {\n998\t prometheus::Error::Msg(format!(\"failed to convert metrics to UTF-8: {}\", e))\n999\t })?)\n1000\t }\n1001\t\n1002\t pub fn admin_session_key_generated(&self) -> Gauge {\n1003\t self.admin_session_key_generated.clone()\n1004\t }\n1005\t\n1006\t pub fn admin_session_revoked_total(&self) -> Counter {\n1007\t self.admin_session_revoked_total.clone()\n1008\t }\n1009\t}\n1010\t\n1011\t/// Generate a short request ID from UUIDv7.\n1012\t///\n1013\t/// UUIDv7 provides time-ordered unique IDs. We take the first 8 hex characters,\n1014\t/// hash them, and encode as hex for a short, URL-safe identifier.\n1015\tpub fn generate_request_id() -> String {\n1016\t let uuid = Uuid::now_v7();\n1017\t let uuid_str = uuid.simple().to_string();\n1018\t // Take first 8 chars (enough entropy for uniqueness)\n1019\t let prefix = &uuid_str[..8];\n1020\t\n1021\t // Hash to get a consistent short representation\n1022\t let mut hasher = DefaultHasher::new();\n1023\t prefix.hash(&mut hasher);\n1024\t let hash = hasher.finish();\n1025\t\n1026\t // Encode as hex (16 chars = 64 bits)\n1027\t format!(\"{:016x}\", hash)\n1028\t}\n1029\t\n1030\t/// Extension trait to add request ID extraction utilities.\n1031\tpub trait RequestIdExt {\n1032\t fn get_request_id(&self) -> Option;\n1033\t fn set_request_id(&mut self, id: &str);\n1034\t}\n1035\t\n1036\timpl RequestIdExt for HeaderMap {\n1037\t fn get_request_id(&self) -> Option {\n1038\t self.get(\"x-request-id\")\n1039\t .and_then(|v| v.to_str().ok())\n1040\t .map(|s| s.to_string())\n1041\t }\n1042\t\n1043\t fn set_request_id(&mut self, id: &str) {\n1044\t if let Ok(val) = HeaderValue::from_str(id) {\n1045\t self.insert(\"x-request-id\", val);\n1046\t }\n1047\t }\n1048\t}\n1049\t\n1050\t/// Guard that decrements the in-flight gauge when dropped.\n1051\t///\n1052\t/// This ensures that even if the handler panics, the in-flight count\n1053\t/// is accurately decremented.\n1054\tstruct InFlightGuard {\n1055\t metrics: Metrics,\n1056\t request_id: String,\n1057\t}\n1058\t\n1059\timpl InFlightGuard {\n1060\t fn new(metrics: Metrics, request_id: String) -> Self {\n1061\t metrics.requests_in_flight.inc();\n1062\t tracing::trace!(\n1063\t request_id = %request_id,\n1064\t requests_in_flight = metrics.requests_in_flight.get(),\n1065\t \"request started\"\n1066\t );\n1067\t Self { metrics, request_id }\n1068\t }\n1069\t}\n1070\t\n1071\timpl Drop for InFlightGuard {\n1072\t fn drop(&mut self) {\n1073\t self.metrics.requests_in_flight.dec();\n1074\t tracing::trace!(\n1075\t request_id = %self.request_id,\n1076\t requests_in_flight = self.metrics.requests_in_flight.get(),\n1077\t \"request completed\"\n1078\t );\n1079\t }\n1080\t}\n1081\t\n1082\t/// Extract the path template from the matched route.\n1083\t///\n1084\t/// Axum's MatchedPath extractor provides the route template (e.g., \"/indexes/{uid}/search\")\n1085\t/// instead of the actual path (e.g., \"/indexes/products/search\"), avoiding high-cardinality labels.\n1086\tfn extract_path_template(request: &Request) -> String {\n1087\t request\n1088\t .extensions()\n1089\t .get::()\n1090\t .map(|mp| mp.as_str())\n1091\t .unwrap_or_else(|| request.uri().path())\n1092\t .to_string()\n1093\t}\n1094\t\n1095\t/// Main middleware that combines request ID injection, structured logging, and Prometheus metrics.\n1096\t///\n1097\t/// IMPORTANT: This middleware must be applied AFTER request_id_middleware in the layer stack\n1098\t/// (i.e., its layer() call must come BEFORE request_id_middleware's layer() call).\n1099\t/// This ensures the request_id header is already set when this middleware runs.\n1100\tpub async fn telemetry_middleware(\n1101\t State(telemetry): State,\n1102\t mut req: Request,\n1103\t next: Next,\n1104\t) -> Response {\n1105\t let start = Instant::now();\n1106\t let method = req.method().clone();\n1107\t let path_template = extract_path_template(&req);\n1108\t let metrics = telemetry.metrics.clone();\n1109\t let pod_id = telemetry.pod_id.clone();\n1110\t\n1111\t // Extract request ID from header (set by request_id_middleware)\n1112\t // The header must already exist because request_id_middleware runs first.\n1113\t let request_id = req\n1114\t .headers()\n1115\t .get_request_id()\n1116\t .expect(\"request_id header must be set by request_id_middleware\");\n1117\t req.headers_mut().set_request_id(&request_id);\n1118\t\n1119\t // Create span for structured logging with pod_id included.\n1120\t // Note: raw path is intentionally omitted to avoid logging index names\n1121\t // (which may contain customer identifiers). Use path_template instead.\n1122\t let span = info_span!(\n1123\t \"request\",\n1124\t request_id = %request_id,\n1125\t pod_id = %pod_id,\n1126\t method = %method,\n1127\t path_template = %path_template,\n1128\t );\n1129\t\n1130\t let _guard = span.enter();\n1131\t\n1132\t // Track in-flight requests\n1133\t let in_flight = InFlightGuard::new(metrics.clone(), request_id.clone());\n1134\t\n1135\t let response = next.run(req).await;\n1136\t\n1137\t drop(in_flight);\n1138\t\n1139\t let status = response.status();\n1140\t let status_u16 = status.as_u16();\n1141\t let duration = start.elapsed();\n1142\t\n1143\t // Record Prometheus metrics\n1144\t metrics\n1145\t .request_duration\n1146\t .with_label_values(&[method.as_str(), &path_template, &status_u16.to_string()])\n1147\t .observe(duration.as_secs_f64());\n1148\t metrics\n1149\t .requests_total\n1150\t .with_label_values(&[method.as_str(), &path_template, &status_u16.to_string()])\n1151\t .inc();\n1152\t\n1153\t // Structured log entry (plan §10 shape)\n1154\t // Base fields: timestamp (from tracing-subscriber), level, message, duration_ms\n1155\t // Additional fields (index, node_count, estimated_hits, degraded)\n1156\t // are added by request handlers via the tracing span.\n1157\t let message = format!(\"{} {}\", method, status);\n1158\t if status.is_server_error() {\n1159\t tracing::error!(\n1160\t target: \"miroir.request\",\n1161\t pod_id = %pod_id,\n1162\t request_id = %request_id,\n1163\t message = %message,\n1164\t duration_ms = duration.as_millis() as u64,\n1165\t status = status_u16,\n1166\t method = %method,\n1167\t path_template = %path_template,\n1168\t );\n1169\t } else if status.is_client_error() {\n1170\t tracing::warn!(\n1171\t target: \"miroir.request\",\n1172\t pod_id = %pod_id,\n1173\t request_id = %request_id,\n1174\t message = %message,\n1175\t duration_ms = duration.as_millis() as u64,\n1176\t status = status_u16,\n1177\t method = %method,\n1178\t path_template = %path_template,\n1179\t );\n1180\t } else {\n1181\t tracing::info!(\n1182\t target: \"miroir.request\",\n1183\t pod_id = %pod_id,\n1184\t request_id = %request_id,\n1185\t message = %message,\n1186\t duration_ms = duration.as_millis() as u64,\n1187\t status = status_u16,\n1188\t method = %method,\n1189\t path_template = %path_template,\n1190\t );\n1191\t }\n1192\t\n1193\t // Ensure request ID is in response headers\n1194\t let mut response = response;\n1195\t if !response.headers().contains_key(\"x-request-id\") {\n1196\t if let Ok(val) = HeaderValue::from_str(&request_id) {\n1197\t response.headers_mut().insert(\"x-request-id\", val);\n1198\t }\n1199\t }\n1200\t\n1201\t response\n1202\t}\n1203\t\n1204\t/// Create the metrics router for the :9090 server.\n1205\tpub fn metrics_router() -> Router {\n1206\t Router::new().route(\"/metrics\", get(metrics_handler))\n1207\t}\n1208\t\n1209\t/// Handler that returns Prometheus metrics in text exposition format.\n1210\tasync fn metrics_handler(State(metrics): State) -> String {\n1211\t match metrics.encode_metrics() {\n1212\t Ok(metrics) => metrics,\n1213\t Err(e) => {\n1214\t tracing::error!(error = %e, \"failed to encode metrics\");\n1215\t format!(\"# ERROR: failed to encode metrics: {}\\n\", e)\n1216\t }\n1217\t }\n1218\t}\n1219\t\n1220\t/// Accessor methods for metrics that can be used by other parts of the application.\n1221\timpl Metrics {\n1222\t // ── Scatter-gather ──\n1223\t\n1224\t pub fn record_scatter_fan_out(&self, size: u64) {\n1225\t self.scatter_fan_out_size.observe(size as f64);\n1226\t }\n1227\t\n1228\t pub fn inc_scatter_partial_responses(&self) {\n1229\t self.scatter_partial_responses.inc();\n1230\t }\n1231\t\n1232\t pub fn inc_scatter_retries(&self) {\n1233\t self.scatter_retries.inc();\n1234\t }\n1235\t\n1236\t // ── Node health ──\n1237\t\n1238\t pub fn set_node_healthy(&self, node_id: &str, healthy: bool) {\n1239\t self.node_healthy.with_label_values(&[node_id]).set(if healthy { 1.0 } else { 0.0 });\n1240\t }\n1241\t\n1242\t pub fn record_node_request_duration(&self, node_id: &str, operation: &str, duration_secs: f64) {\n1243\t self.node_request_duration.with_label_values(&[node_id, operation]).observe(duration_secs);\n1244\t }\n1245\t\n1246\t pub fn inc_node_errors(&self, node_id: &str, error_type: &str) {\n1247\t self.node_errors.with_label_values(&[node_id, error_type]).inc();\n1248\t }\n1249\t\n1250\t // ── Shards ──\n1251\t\n1252\t pub fn set_shard_coverage(&self, coverage: f64) {\n1253\t self.shard_coverage.set(coverage);\n1254\t }\n1255\t\n1256\t pub fn set_degraded_shards(&self, count: f64) {\n1257\t self.degraded_shards.set(count);\n1258\t }\n1259\t\n1260\t pub fn set_shard_distribution(&self, node_id: &str, count: f64) {\n1261\t self.shard_distribution.with_label_values(&[node_id]).set(count);\n1262\t }\n1263\t\n1264\t // ── Tasks ──\n1265\t\n1266\t pub fn observe_task_processing_age(&self, age_secs: f64) {\n1267\t self.task_processing_age.observe(age_secs);\n1268\t }\n1269\t\n1270\t pub fn inc_tasks_total(&self, status: &str) {\n1271\t self.tasks_total.with_label_values(&[status]).inc();\n1272\t }\n1273\t\n1274\t pub fn set_task_registry_size(&self, size: f64) {\n1275\t self.task_registry_size.set(size);\n1276\t }\n1277\t\n1278\t // ── Rebalancer ──\n1279\t\n1280\t pub fn set_rebalance_in_progress(&self, v: bool) {\n1281\t self.rebalance_in_progress.set(if v { 1.0 } else { 0.0 });\n1282\t }\n1283\t\n1284\t pub fn inc_rebalance_documents_migrated(&self, count: u64) {\n1285\t self.rebalance_documents_migrated.inc_by(count as f64);\n1286\t }\n1287\t\n1288\t pub fn observe_rebalance_duration(&self, secs: f64) {\n1289\t self.rebalance_duration.observe(secs);\n1290\t }\n1291\t\n1292\t // ── §13.11 Multi-search ──\n1293\t\n1294\t pub fn observe_multisearch_queries_per_batch(&self, count: u64) {\n1295\t if let Some(ref m) = self.multisearch_queries_per_batch {\n1296\t m.observe(count as f64);\n1297\t }\n1298\t }\n1299\t\n1300\t pub fn inc_multisearch_batches_total(&self) {\n1301\t if let Some(ref m) = self.multisearch_batches_total {\n1302\t m.inc();\n1303\t }\n1304\t }\n1305\t\n1306\t pub fn inc_multisearch_partial_failures(&self) {\n1307\t if let Some(ref m) = self.multisearch_partial_failures_total {\n1308\t m.inc();\n1309\t }\n1310\t }\n1311\t\n1312\t pub fn inc_multisearch_tenant_session_pin_override(&self, tenant: &str) {\n1313\t if let Some(ref m) = self.multisearch_tenant_session_pin_override_total {\n1314\t m.with_label_values(&[tenant]).inc();\n1315\t }\n1316\t }\n1317\t\n1318\t // ── §13.12 Vector search ──\n1319\t\n1320\t pub fn inc_vector_search_over_fetched(&self) {\n1321\t if let Some(ref m) = self.vector_search_over_fetched_total {\n1322\t m.inc();\n1323\t }\n1324\t }\n1325\t\n1326\t pub fn inc_vector_merge_strategy(&self, strategy: &str) {\n1327\t if let Some(ref m) = self.vector_merge_strategy {\n1328\t m.with_label_values(&[strategy]).inc();\n1329\t }\n1330\t }\n1331\t\n1332\t pub fn inc_vector_embedder_drift(&self) {\n1333\t if let Some(ref m) = self.vector_embedder_drift_total {\n1334\t m.inc();\n1335\t }\n1336\t }\n1337\t\n1338\t // ── §13.13 CDC ──\n1339\t\n1340\t pub fn inc_cdc_events_published(&self, sink: &str, index: &str) {\n1341\t if let Some(ref m) = self.cdc_events_published_total {\n1342\t m.with_label_values(&[sink, index]).inc();\n1343\t }\n1344\t }\n1345\t\n1346\t pub fn set_cdc_lag_seconds(&self, sink: &str, lag: f64) {\n1347\t if let Some(ref m) = self.cdc_lag_seconds {\n1348\t m.with_label_values(&[sink]).set(lag);\n1349\t }\n1350\t }\n1351\t\n1352\t pub fn set_cdc_buffer_bytes(&self, sink: &str, bytes: f64) {\n1353\t if let Some(ref m) = self.cdc_buffer_bytes {\n1354\t m.with_label_values(&[sink]).set(bytes);\n1355\t }\n1356\t }\n1357\t\n1358\t pub fn inc_cdc_dropped(&self, sink: &str) {\n1359\t if let Some(ref m) = self.cdc_dropped_total {\n1360\t m.with_label_values(&[sink]).inc();\n1361\t }\n1362\t }\n1363\t\n1364\t pub fn inc_cdc_events_suppressed(&self, origin: &str) {\n1365\t if let Some(ref m) = self.cdc_events_suppressed_total {\n1366\t m.with_label_values(&[origin]).inc();\n1367\t }\n1368\t }\n1369\t\n1370\t // ── §13.14 TTL ──\n1371\t\n1372\t pub fn inc_ttl_documents_expired(&self, index: &str) {\n1373\t if let Some(ref m) = self.ttl_documents_expired_total {\n1374\t m.with_label_values(&[index]).inc();\n1375\t }\n1376\t }\n1377\t\n1378\t pub fn observe_ttl_sweep_duration(&self, index: &str, secs: f64) {\n1379\t if let Some(ref m) = self.ttl_sweep_duration_seconds {\n1380\t m.with_label_values(&[index]).observe(secs);\n1381\t }\n1382\t }\n1383\t\n1384\t pub fn set_ttl_pending_estimate(&self, index: &str, count: f64) {\n1385\t if let Some(ref m) = self.ttl_pending_estimate {\n1386\t m.with_label_values(&[index]).set(count);\n1387\t }\n1388\t }\n1389\t\n1390\t // ── §13.15 Tenant affinity ──\n1391\t\n1392\t pub fn inc_tenant_queries(&self, tenant: &str, group: &str) {\n1393\t if let Some(ref m) = self.tenant_queries_total {\n1394\t m.with_label_values(&[tenant, group]).inc();\n1395\t }\n1396\t }\n1397\t\n1398\t pub fn set_tenant_pinned_groups(&self, tenant: &str, group: u32) {\n1399\t if let Some(ref m) = self.tenant_pinned_groups {\n1400\t m.with_label_values(&[tenant]).set(group as f64);\n1401\t }\n1402\t }\n1403\t\n1404\t pub fn inc_tenant_fallback(&self, reason: &str) {\n1405\t if let Some(ref m) = self.tenant_fallback_total {\n1406\t m.with_label_values(&[reason]).inc();\n1407\t }\n1408\t }\n1409\t\n1410\t // ── §13.16 Shadow ──\n1411\t\n1412\t pub fn inc_shadow_diff(&self, kind: &str) {\n1413\t if let Some(ref m) = self.shadow_diff_total {\n1414\t m.with_label_values(&[kind]).inc();\n1415\t }\n1416\t }\n1417\t\n1418\t pub fn set_shadow_kendall_tau(&self, tau: f64) {\n1419\t if let Some(ref m) = self.shadow_kendall_tau {\n1420\t m.set(tau);\n1421\t }\n1422\t }\n1423\t\n1424\t pub fn observe_shadow_latency_delta(&self, delta: f64) {\n1425\t if let Some(ref m) = self.shadow_latency_delta_seconds {\n1426\t m.observe(delta);\n1427\t }\n1428\t }\n1429\t\n1430\t pub fn inc_shadow_errors(&self, target: &str, side: &str) {\n1431\t if let Some(ref m) = self.shadow_errors_total {\n1432\t m.with_label_values(&[target, side]).inc();\n1433\t }\n1434\t }\n1435\t\n1436\t // ── §13.17 ILM ──\n1437\t\n1438\t pub fn inc_rollover_events(&self, policy: &str) {\n1439\t if let Some(ref m) = self.rollover_events_total {\n1440\t m.with_label_values(&[policy]).inc();\n1441\t }\n1442\t }\n1443\t\n1444\t pub fn set_rollover_active_indexes(&self, alias: &str, count: f64) {\n1445\t if let Some(ref m) = self.rollover_active_indexes {\n1446\t m.with_label_values(&[alias]).set(count);\n1447\t }\n1448\t }\n1449\t\n1450\t pub fn inc_rollover_documents_expired(&self, policy: &str) {\n1451\t if let Some(ref m) = self.rollover_documents_expired_total {\n1452\t m.with_label_values(&[policy]).inc();\n1453\t }\n1454\t }\n1455\t\n1456\t pub fn set_rollover_last_action_seconds(&self, policy: &str, secs: f64) {\n1457\t if let Some(ref m) = self.rollover_last_action_seconds {\n1458\t m.with_label_values(&[policy]).set(secs);\n1459\t }\n1460\t }\n1461\t\n1462\t // ── §13.18 Canary ──\n1463\t\n1464\t pub fn inc_canary_runs(&self, canary: &str, result: &str) {\n1465\t if let Some(ref m) = self.canary_runs_total {\n1466\t m.with_label_values(&[canary, result]).inc();\n1467\t }\n1468\t }\n1469\t\n1470\t pub fn observe_canary_latency_ms(&self, canary: &str, ms: f64) {\n1471\t if let Some(ref m) = self.canary_latency_ms {\n1472\t m.with_label_values(&[canary]).observe(ms);\n1473\t }\n1474\t }\n1475\t\n1476\t pub fn inc_canary_assertion_failures(&self, canary: &str, assertion_type: &str) {\n1477\t if let Some(ref m) = self.canary_assertion_failures_total {\n1478\t m.with_label_values(&[canary, assertion_type]).inc();\n1479\t }\n1480\t }\n1481\t\n1482\t // ── §13.19 Admin UI ──\n1483\t\n1484\t pub fn inc_admin_ui_sessions(&self) {\n1485\t if let Some(ref m) = self.admin_ui_sessions_total {\n1486\t m.inc();\n1487\t }\n1488\t }\n1489\t\n1490\t pub fn inc_admin_ui_action(&self, action: &str) {\n1491\t if let Some(ref m) = self.admin_ui_action_total {\n1492\t m.with_label_values(&[action]).inc();\n1493\t }\n1494\t }\n1495\t\n1496\t pub fn inc_admin_ui_destructive_action(&self, action: &str) {\n1497\t if let Some(ref m) = self.admin_ui_destructive_action_total {\n1498\t m.with_label_values(&[action]).inc();\n1499\t }\n1500\t }\n1501\t\n1502\t // ── §13.20 Explain ──\n1503\t\n1504\t pub fn inc_explain_requests(&self) {\n1505\t if let Some(ref m) = self.explain_requests_total {\n1506\t m.inc();\n1507\t }\n1508\t }\n1509\t\n1510\t pub fn inc_explain_warnings(&self, warning_type: &str) {\n1511\t if let Some(ref m) = self.explain_warnings_total {\n1512\t m.with_label_values(&[warning_type]).inc();\n1513\t }\n1514\t }\n1515\t\n1516\t pub fn inc_explain_execute(&self) {\n1517\t if let Some(ref m) = self.explain_execute_total {\n1518\t m.inc();\n1519\t }\n1520\t }\n1521\t\n1522\t // ── §13.21 Search UI ──\n1523\t\n1524\t pub fn inc_search_ui_sessions(&self) {\n1525\t if let Some(ref m) = self.search_ui_sessions_total {\n1526\t m.inc();\n1527\t }\n1528\t }\n1529\t\n1530\t pub fn inc_search_ui_queries(&self, index: &str) {\n1531\t if let Some(ref m) = self.search_ui_queries_total {\n1532\t m.with_label_values(&[index]).inc();\n1533\t }\n1534\t }\n1535\t\n1536\t pub fn inc_search_ui_zero_hits(&self, index: &str) {\n1537\t if let Some(ref m) = self.search_ui_zero_hits_total {\n1538\t m.with_label_values(&[index]).inc();\n1539\t }\n1540\t }\n1541\t\n1542\t pub fn inc_search_ui_click_through(&self, index: &str) {\n1543\t if let Some(ref m) = self.search_ui_click_through_total {\n1544\t m.with_label_values(&[index]).inc();\n1545\t }\n1546\t }\n1547\t\n1548\t pub fn set_search_ui_p95_ms(&self, index: &str, ms: f64) {\n1549\t if let Some(ref m) = self.search_ui_p95_ms {\n1550\t m.with_label_values(&[index]).set(ms);\n1551\t }\n1552\t }\n1553\t\n1554\t // ── §14.9 Resource-pressure ──\n1555\t\n1556\t pub fn set_memory_pressure(&self, level: u32) {\n1557\t self.memory_pressure.set(level as f64);\n1558\t }\n1559\t\n1560\t pub fn inc_cpu_throttled_seconds(&self, secs: f64) {\n1561\t self.cpu_throttled_seconds_total.inc_by(secs);\n1562\t }\n1563\t\n1564\t pub fn set_request_queue_depth(&self, depth: u64) {\n1565\t self.request_queue_depth.set(depth as f64);\n1566\t }\n1567\t\n1568\t pub fn set_background_queue_depth(&self, job_type: &str, depth: u64) {\n1569\t self.background_queue_depth.with_label_values(&[job_type]).set(depth as f64);\n1570\t }\n1571\t\n1572\t pub fn set_peer_pod_count(&self, count: u64) {\n1573\t self.peer_pod_count.set(count as f64);\n1574\t }\n1575\t\n1576\t pub fn set_leader(&self, is_leader: bool) {\n1577\t self.leader.set(if is_leader { 1.0 } else { 0.0 });\n1578\t }\n1579\t\n1580\t pub fn set_owned_shards_count(&self, count: u64) {\n1581\t self.owned_shards_count.set(count as f64);\n1582\t }\n1583\t\n1584\t // ── §13.5 Two-phase settings broadcast metrics ──\n1585\t\n1586\t pub fn set_settings_broadcast_phase(&self, index: &str, phase: u8) {\n1587\t self.settings_broadcast_phase.with_label_values(&[index]).set(phase as f64);\n1588\t }\n1589\t\n1590\t pub fn clear_settings_broadcast_phase(&self, index: &str) {\n1591\t self.settings_broadcast_phase.with_label_values(&[index]).set(0.0);\n1592\t }\n1593\t\n1594\t pub fn inc_settings_hash_mismatch(&self) {\n1595\t self.settings_hash_mismatch_total.inc();\n1596\t }\n1597\t\n1598\t pub fn inc_settings_drift_repair(&self, index: &str) {\n1599\t self.settings_drift_repair_total.with_label_values(&[index]).inc();\n1600\t }\n1601\t\n1602\t pub fn set_settings_version(&self, index: &str, version: u64) {\n1603\t self.settings_version.with_label_values(&[index]).set(version as f64);\n1604\t }\n1605\t\n1606\t pub fn get_settings_version(&self, index: &str) -> f64 {\n1607\t self.settings_version.with_label_values(&[index]).get()\n1608\t }\n1609\t\n1610\t // ── §13.7 Alias metrics ──\n1611\t\n1612\t pub fn inc_alias_resolution(&self, alias: &str) {\n1613\t self.alias_resolutions_total.with_label_values(&[alias]).inc();\n1614\t }\n1615\t\n1616\t pub fn inc_alias_flip(&self, alias: &str) {\n1617\t self.alias_flips_total.with_label_values(&[alias]).inc();\n1618\t }\n1619\t\n1620\t // ── §13.6 Session pinning metrics ──\n1621\t\n1622\t pub fn set_session_active_count(&self, count: u64) {\n1623\t self.session_active_count.set(count as f64);\n1624\t }\n1625\t\n1626\t pub fn inc_session_pin_enforced(&self, strategy: &str) {\n1627\t self.session_pin_enforced_total.with_label_values(&[strategy]).inc();\n1628\t }\n1629\t\n1630\t pub fn observe_session_wait_duration(&self, duration_seconds: f64) {\n1631\t self.session_wait_duration_seconds.observe(duration_seconds);\n1632\t }\n1633\t\n1634\t pub fn inc_session_wait_timeout(&self, strategy: &str) {\n1635\t self.session_wait_timeout_total.with_label_values(&[strategy]).inc();\n1636\t }\n1637\t\n1638\t pub fn registry(&self) -> &Registry {\n1639\t &self.registry\n1640\t }\n1641\t}\n1642\t\n1643\t#[cfg(test)]\n1644\tmod tests {\n1645\t use super::*;\n1646\t\n1647\t #[test]\n1648\t fn test_request_id_generation() {\n1649\t // Generate multiple IDs to verify format\n1650\t for _ in 0..10 {\n1651\t let id = generate_request_id();\n1652\t\n1653\t // IDs should be 16 hex chars (64-bit hash)\n1654\t assert_eq!(id.len(), 16);\n1655\t\n1656\t // IDs should be hexadecimal\n1657\t assert!(id.chars().all(|c| c.is_ascii_hexdigit()));\n1658\t }\n1659\t\n1660\t // Test that different UUID prefixes produce different IDs\n1661\t let id1 = generate_request_id();\n1662\t std::thread::sleep(std::time::Duration::from_millis(5));\n1663\t let id2 = generate_request_id();\n1664\t // In production, time ensures uniqueness; test just verifies format above\n1665\t assert_eq!(id1.len(), 16);\n1666\t assert_eq!(id2.len(), 16);\n1667\t }\n1668\t\n1669\t #[test]\n1670\t fn test_metrics_creation() {\n1671\t // Default config has all §13 features enabled\n1672\t let metrics = Metrics::new(&MiroirConfig::default());\n1673\t\n1674\t // Add some sample data to ensure metrics show up in output\n1675\t metrics.request_duration.with_label_values(&[\"GET\", \"/test\", \"200\"]).observe(0.1);\n1676\t metrics.requests_total.with_label_values(&[\"GET\", \"/test\", \"200\"]).inc();\n1677\t metrics.requests_in_flight.inc();\n1678\t metrics.node_healthy.with_label_values(&[\"test-node\"]).set(1.0);\n1679\t metrics.node_request_duration.with_label_values(&[\"test-node\", \"search\"]).observe(0.05);\n1680\t metrics.node_errors.with_label_values(&[\"test-node\", \"timeout\"]).inc();\n1681\t metrics.shard_coverage.set(1.0);\n1682\t metrics.degraded_shards.set(0.0);\n1683\t metrics.shard_distribution.with_label_values(&[\"test-node\"]).set(32.0);\n1684\t metrics.task_processing_age.observe(0.1);\n1685\t metrics.tasks_total.with_label_values(&[\"completed\"]).inc();\n1686\t metrics.task_registry_size.set(5.0);\n1687\t metrics.scatter_fan_out_size.observe(3.0);\n1688\t metrics.scatter_partial_responses.inc();\n1689\t metrics.scatter_retries.inc();\n1690\t metrics.rebalance_in_progress.set(0.0);\n1691\t metrics.rebalance_documents_migrated.inc();\n1692\t metrics.rebalance_duration.observe(10.0);\n1693\t\n1694\t // Write to advanced Vec metrics so they appear in output\n1695\t metrics.inc_multisearch_tenant_session_pin_override(\"t1\");\n1696\t metrics.inc_vector_merge_strategy(\"convex\");\n1697\t metrics.inc_cdc_events_published(\"webhook\", \"idx1\");\n1698\t metrics.set_cdc_lag_seconds(\"webhook\", 0.5);\n1699\t metrics.set_cdc_buffer_bytes(\"webhook\", 1024.0);\n1700\t metrics.inc_cdc_dropped(\"webhook\");\n1701\t metrics.inc_cdc_events_suppressed(\"origin1\");\n1702\t metrics.inc_ttl_documents_expired(\"idx1\");\n1703\t metrics.observe_ttl_sweep_duration(\"idx1\", 0.1);\n1704\t metrics.set_ttl_pending_estimate(\"idx1\", 50.0);\n1705\t metrics.inc_tenant_queries(\"t1\", \"g1\");\n1706\t metrics.set_tenant_pinned_groups(\"t1\", 1);\n1707\t metrics.inc_tenant_fallback(\"no_group\");\n1708\t metrics.inc_shadow_diff(\"rank\");\n1709\t metrics.inc_shadow_errors(\"target1\", \"primary\");\n1710\t metrics.inc_rollover_events(\"policy1\");\n1711\t metrics.set_rollover_active_indexes(\"alias1\", 1.0);\n1712\t metrics.inc_rollover_documents_expired(\"policy1\");\n1713\t metrics.set_rollover_last_action_seconds(\"policy1\", 60.0);\n1714\t metrics.inc_canary_runs(\"canary1\", \"pass\");\n1715\t metrics.observe_canary_latency_ms(\"canary1\", 50.0);\n1716\t metrics.inc_canary_assertion_failures(\"canary1\", \"latency\");\n1717\t metrics.inc_admin_ui_action(\"login\");\n1718\t metrics.inc_admin_ui_destructive_action(\"delete_index\");\n1719\t metrics.inc_explain_warnings(\"slow_plan\");\n1720\t metrics.inc_search_ui_queries(\"idx1\");\n1721\t metrics.inc_search_ui_zero_hits(\"idx1\");\n1722\t metrics.inc_search_ui_click_through(\"idx1\");\n1723\t metrics.set_search_ui_p95_ms(\"idx1\", 150.0);\n1724\t\n1725\t // §14.9 Resource-pressure metrics\n1726\t metrics.set_memory_pressure(0);\n1727\t metrics.inc_cpu_throttled_seconds(1.5);\n1728\t metrics.set_request_queue_depth(42);\n1729\t metrics.set_background_queue_depth(\"rebalance\", 5);\n1730\t metrics.set_background_queue_depth(\"replication\", 3);\n1731\t metrics.set_peer_pod_count(3);\n1732\t metrics.set_leader(true);\n1733\t metrics.set_owned_shards_count(12);\n1734\t\n1735\t let encoded = metrics.encode_metrics();\n1736\t assert!(encoded.is_ok());\n1737\t\n1738\t let output = encoded.unwrap();\n1739\t\n1740\t // Verify all 18 core plan §10 metric names appear in the output\n1741\t let expected_metrics = [\n1742\t // Request metrics\n1743\t \"miroir_request_duration_seconds\",\n1744\t \"miroir_requests_total\",\n1745\t \"miroir_requests_in_flight\",\n1746\t // Node health metrics\n1747\t \"miroir_node_healthy\",\n1748\t \"miroir_node_request_duration_seconds\",\n1749\t \"miroir_node_errors_total\",\n1750\t // Shard metrics\n1751\t \"miroir_shard_coverage\",\n1752\t \"miroir_degraded_shards_total\",\n1753\t \"miroir_shard_distribution\",\n1754\t // Task metrics\n1755\t \"miroir_task_processing_age_seconds\",\n1756\t \"miroir_tasks_total\",\n1757\t \"miroir_task_registry_size\",\n1758\t // Scatter-gather metrics\n1759\t \"miroir_scatter_fan_out_size\",\n1760\t \"miroir_scatter_partial_responses_total\",\n1761\t \"miroir_scatter_retries_total\",\n1762\t // Rebalancer metrics\n1763\t \"miroir_rebalance_in_progress\",\n1764\t \"miroir_rebalance_documents_migrated_total\",\n1765\t \"miroir_rebalance_duration_seconds\",\n1766\t ];\n1767\t for name in &expected_metrics {\n1768\t assert!(output.contains(name), \"missing metric: {}\", name);\n1769\t }\n1770\t\n1771\t // With defaults (all §13 enabled), advanced metrics should be present\n1772\t let advanced_metrics = [\n1773\t // §13.11 Multi-search\n1774\t \"miroir_multisearch_queries_per_batch\",\n1775\t \"miroir_multisearch_batches_total\",\n1776\t \"miroir_multisearch_partial_failures_total\",\n1777\t \"miroir_tenant_session_pin_override_total\",\n1778\t // §13.12 Vector\n1779\t \"miroir_vector_search_over_fetched_total\",\n1780\t \"miroir_vector_merge_strategy\",\n1781\t \"miroir_vector_embedder_drift_total\",\n1782\t // §13.13 CDC\n1783\t \"miroir_cdc_events_published_total\",\n1784\t \"miroir_cdc_lag_seconds\",\n1785\t \"miroir_cdc_buffer_bytes\",\n1786\t \"miroir_cdc_dropped_total\",\n1787\t \"miroir_cdc_events_suppressed_total\",\n1788\t // §13.14 TTL\n1789\t \"miroir_ttl_documents_expired_total\",\n1790\t \"miroir_ttl_sweep_duration_seconds\",\n1791\t \"miroir_ttl_pending_estimate\",\n1792\t // §13.15 Tenant\n1793\t \"miroir_tenant_queries_total\",\n1794\t \"miroir_tenant_pinned_groups\",\n1795\t \"miroir_tenant_fallback_total\",\n1796\t // §13.16 Shadow\n1797\t \"miroir_shadow_diff_total\",\n1798\t \"miroir_shadow_kendall_tau\",\n1799\t \"miroir_shadow_latency_delta_seconds\",\n1800\t \"miroir_shadow_errors_total\",\n1801\t // §13.17 ILM\n1802\t \"miroir_rollover_events_total\",\n1803\t \"miroir_rollover_active_indexes\",\n1804\t \"miroir_rollover_documents_expired_total\",\n1805\t \"miroir_rollover_last_action_seconds\",\n1806\t // §13.18 Canary\n1807\t \"miroir_canary_runs_total\",\n1808\t \"miroir_canary_latency_ms\",\n1809\t \"miroir_canary_assertion_failures_total\",\n1810\t // §13.19 Admin UI\n1811\t \"miroir_admin_ui_sessions_total\",\n1812\t \"miroir_admin_ui_action_total\",\n1813\t \"miroir_admin_ui_destructive_action_total\",\n1814\t // §13.20 Explain\n1815\t \"miroir_explain_requests_total\",\n1816\t \"miroir_explain_warnings_total\",\n1817\t \"miroir_explain_execute_total\",\n1818\t // §13.21 Search UI\n1819\t \"miroir_search_ui_sessions_total\",\n1820\t \"miroir_search_ui_queries_total\",\n1821\t \"miroir_search_ui_zero_hits_total\",\n1822\t \"miroir_search_ui_click_through_total\",\n1823\t \"miroir_search_ui_p95_ms\",\n1824\t ];\n1825\t for name in &advanced_metrics {\n1826\t assert!(output.contains(name), \"missing advanced metric: {}\", name);\n1827\t }\n1828\t }\n1829\t\n1830\t #[test]\n1831\t fn test_metrics_feature_flags_off() {\n1832\t // Build a config with all §13.11-13.21 features disabled\n1833\t let mut config = MiroirConfig::default();\n1834\t config.multi_search.enabled = false;\n1835\t config.vector_search.enabled = false;\n1836\t config.cdc.enabled = false;\n1837\t config.ttl.enabled = false;\n1838\t config.tenant_affinity.enabled = false;\n1839\t config.shadow.enabled = false;\n1840\t config.ilm.enabled = false;\n1841\t config.canary_runner.enabled = false;\n1842\t config.admin_ui.enabled = false;\n1843\t config.explain.enabled = false;\n1844\t config.search_ui.enabled = false;\n1845\t\n1846\t let metrics = Metrics::new(&config);\n1847\t\n1848\t // Write to core Vec metrics so they appear in output\n1849\t metrics.request_duration.with_label_values(&[\"GET\", \"/test\", \"200\"]).observe(0.1);\n1850\t\n1851\t let encoded = metrics.encode_metrics().unwrap();\n1852\t\n1853\t // Core metrics should still be present\n1854\t assert!(encoded.contains(\"miroir_request_duration_seconds\"));\n1855\t assert!(encoded.contains(\"miroir_rebalance_duration_seconds\"));\n1856\t\n1857\t // Advanced metrics should NOT appear\n1858\t let advanced_names = [\n1859\t \"miroir_multisearch_queries_per_batch\",\n1860\t \"miroir_vector_search_over_fetched_total\",\n1861\t \"miroir_cdc_events_published_total\",\n1862\t \"miroir_ttl_documents_expired_total\",\n1863\t \"miroir_tenant_queries_total\",\n1864\t \"miroir_shadow_diff_total\",\n1865\t \"miroir_rollover_events_total\",\n1866\t \"miroir_canary_runs_total\",\n1867\t \"miroir_admin_ui_sessions_total\",\n1868\t \"miroir_explain_requests_total\",\n1869\t \"miroir_search_ui_sessions_total\",\n1870\t ];\n1871\t for name in &advanced_names {\n1872\t assert!(!encoded.contains(name), \"advanced metric should not appear when disabled: {}\", name);\n1873\t }\n1874\t }\n1875\t\n1876\t #[test]\n1877\t fn test_feature_gated_accessors_noop_when_disabled() {\n1878\t let mut config = MiroirConfig::default();\n1879\t config.multi_search.enabled = false;\n1880\t config.vector_search.enabled = false;\n1881\t config.cdc.enabled = false;\n1882\t config.ttl.enabled = false;\n1883\t config.tenant_affinity.enabled = false;\n1884\t config.shadow.enabled = false;\n1885\t config.ilm.enabled = false;\n1886\t config.canary_runner.enabled = false;\n1887\t config.admin_ui.enabled = false;\n1888\t config.explain.enabled = false;\n1889\t config.search_ui.enabled = false;\n1890\t\n1891\t let metrics = Metrics::new(&config);\n1892\t\n1893\t // All accessor methods should be safe to call (no-op)\n1894\t metrics.observe_multisearch_queries_per_batch(5);\n1895\t metrics.inc_multisearch_batches_total();\n1896\t metrics.inc_multisearch_partial_failures();\n1897\t metrics.inc_multisearch_tenant_session_pin_override(\"t1\");\n1898\t metrics.inc_vector_search_over_fetched();\n1899\t metrics.inc_vector_merge_strategy(\"convex\");\n1900\t metrics.inc_vector_embedder_drift();\n1901\t metrics.inc_cdc_events_published(\"webhook\", \"idx\");\n1902\t metrics.set_cdc_lag_seconds(\"webhook\", 1.5);\n1903\t metrics.set_cdc_buffer_bytes(\"webhook\", 1024.0);\n1904\t metrics.inc_cdc_dropped(\"webhook\");\n1905\t metrics.inc_cdc_events_suppressed(\"origin1\");\n1906\t metrics.inc_ttl_documents_expired(\"idx\");\n1907\t metrics.observe_ttl_sweep_duration(\"idx\", 0.1);\n1908\t metrics.set_ttl_pending_estimate(\"idx\", 50.0);\n1909\t metrics.inc_tenant_queries(\"t1\", \"0\");\n1910\t metrics.set_tenant_pinned_groups(\"t1\", 1);\n1911\t metrics.inc_tenant_fallback(\"no_group\");\n1912\t metrics.inc_shadow_diff(\"rank\");\n1913\t metrics.set_shadow_kendall_tau(0.95);\n1914\t metrics.observe_shadow_latency_delta(0.01);\n1915\t metrics.inc_shadow_errors(\"target1\", \"primary\");\n1916\t metrics.inc_rollover_events(\"policy1\");\n1917\t metrics.set_rollover_active_indexes(\"alias1\", 1.0);\n1918\t metrics.inc_rollover_documents_expired(\"policy1\");\n1919\t metrics.set_rollover_last_action_seconds(\"policy1\", 60.0);\n1920\t metrics.inc_canary_runs(\"canary1\", \"pass\");\n1921\t metrics.observe_canary_latency_ms(\"canary1\", 50.0);\n1922\t metrics.inc_canary_assertion_failures(\"canary1\", \"latency\");\n1923\t metrics.inc_admin_ui_sessions();\n1924\t metrics.inc_admin_ui_action(\"login\");\n1925\t metrics.inc_admin_ui_destructive_action(\"delete_index\");\n1926\t metrics.inc_explain_requests();\n1927\t metrics.inc_explain_warnings(\"slow_plan\");\n1928\t metrics.inc_explain_execute();\n1929\t metrics.inc_search_ui_sessions();\n1930\t metrics.inc_search_ui_queries(\"idx\");\n1931\t metrics.inc_search_ui_zero_hits(\"idx\");\n1932\t metrics.inc_search_ui_click_through(\"idx\");\n1933\t metrics.set_search_ui_p95_ms(\"idx\", 150.0);\n1934\t }\n1935\t\n1936\t #[test]\n1937\t fn test_header_request_id() {\n1938\t let mut headers = HeaderMap::new();\n1939\t assert!(headers.get_request_id().is_none());\n1940\t\n1941\t headers.set_request_id(\"test-id-123\");\n1942\t assert_eq!(headers.get_request_id(), Some(\"test-id-123\".to_string()));\n1943\t }\n1944\t\n1945\t // ---------------------------------------------------------------------------\n1946\t // RequestId type tests\n1947\t // ---------------------------------------------------------------------------\n1948\t\n1949\t #[test]\n1950\t fn test_request_id_format() {\n1951\t let id = RequestId::new();\n1952\t // RequestId should be exactly 8 hex characters\n1953\t assert_eq!(id.as_str().len(), 8);\n1954\t assert!(id.as_str().chars().all(|c| c.is_ascii_hexdigit()));\n1955\t }\n1956\t\n1957\t #[test]\n1958\t fn test_request_id_parse_valid() {\n1959\t // Valid 8-char hex string\n1960\t let valid = \"abcd1234\";\n1961\t let parsed = RequestId::parse(valid.to_string());\n1962\t assert!(parsed.is_some());\n1963\t assert_eq!(parsed.unwrap().as_str(), valid);\n1964\t }\n1965\t\n1966\t #[test]\n1967\t fn test_request_id_parse_invalid_wrong_length() {\n1968\t // Wrong length (too short)\n1969\t assert!(RequestId::parse(\"abc123\".to_string()).is_none());\n1970\t // Wrong length (too long)\n1971\t assert!(RequestId::parse(\"abcd12345678\".to_string()).is_none());\n1972\t }\n1973\t\n1974\t #[test]\n1975\t fn test_request_id_parse_invalid_non_hex() {\n1976\t // Contains non-hex characters\n1977\t assert!(RequestId::parse(\"abcd1234!\".to_string()).is_none());\n1978\t assert!(RequestId::parse(\"ghijklmn\".to_string()).is_none());\n1979\t }\n1980\t\n1981\t #[test]\n1982\t fn test_request_id_uniqueness() {\n1983\t // Generate two consecutive IDs - they should be different\n1984\t // due to UUIDv7's timestamp component\n1985\t let id1 = RequestId::new();\n1986\t std::thread::sleep(std::time::Duration::from_millis(5));\n1987\t let id2 = RequestId::new();\n1988\t\n1989\t assert_ne!(id1, id2);\n1990\t assert_ne!(id1.as_str(), id2.as_str());\n1991\t }\n1992\t\n1993\t // ---------------------------------------------------------------------------\n1994\t // Integration tests for request_id_middleware\n1995\t // ---------------------------------------------------------------------------\n1996\t\n1997\t #[tokio::test]\n1998\t async fn test_request_id_middleware_adds_header() {\n1999\t use axum::{routing::get, Router};\n2000\t use http_body_util::Full;\n2001\t use tower::ServiceExt;\n2002\t\n2003\t // Build a simple router with the request ID middleware\n2004\t let app = Router::new()\n2005\t .route(\"/test\", get(|| async { \"OK\" }))\n2006\t .layer(axum::middleware::from_fn(request_id_middleware));\n2007\t\n2008\t // Create a test request\n2009\t let request = Request::builder()\n2010\t .uri(\"/test\")\n2011\t .body(Full::default())\n2012\t .unwrap();\n2013\t\n2014\t // Send the request\n2015\t let response = app.oneshot(request).await.unwrap();\n2016\t\n2017\t // Verify X-Request-Id header is present\n2018\t let header = response\n2019\t .headers()\n2020\t .get(\"x-request-id\")\n2021\t .expect(\"X-Request-Id header should be present\");\n2022\t let header_value = header.to_str().unwrap();\n2023\t\n2024\t // Verify it's 8 hex characters\n2025\t assert_eq!(\n2026\t header_value.len(),\n2027\t 8,\n2028\t \"X-Request-Id should be 8 characters\"\n2029\t );\n2030\t assert!(\n2031\t header_value.chars().all(|c| c.is_ascii_hexdigit()),\n2032\t \"X-Request-Id should be hexadecimal\"\n2033\t );\n2034\t }\n2035\t\n2036\t #[tokio::test]\n2037\t async fn test_request_id_middleware_unique_per_request() {\n2038\t use axum::{routing::get, Router};\n2039\t use http_body_util::Full;\n2040\t use tower::ServiceExt;\n2041\t\n2042\t // Build a simple router with the request ID middleware\n2043\t let app = Router::new()\n2044\t .route(\"/test\", get(|| async { \"OK\" }))\n2045\t .layer(axum::middleware::from_fn(request_id_middleware));\n2046\t\n2047\t // Create two identical requests\n2048\t let request1 = Request::builder()\n2049\t .uri(\"/test\")\n2050\t .body(Full::default())\n2051\t .unwrap();\n2052\t\n2053\t let request2 = Request::builder()\n2054\t .uri(\"/test\")\n2055\t .body(Full::default())\n2056\t .unwrap();\n2057\t\n2058\t // Send both requests\n2059\t let response1 = app.clone().oneshot(request1).await.unwrap();\n2060\t let response2 = app.oneshot(request2).await.unwrap();\n2061\t\n2062\t // Extract headers\n2063\t let id1 = response1\n2064\t .headers()\n2065\t .get(\"x-request-id\")\n2066\t .unwrap()\n2067\t .to_str()\n2068\t .unwrap();\n2069\t let id2 = response2\n2070\t .headers()\n2071\t .get(\"x-request-id\")\n2072\t .unwrap()\n2073\t .to_str()\n2074\t .unwrap();\n2075\t\n2076\t // Verify IDs are different (UUIDv7 timestamp ensures this)\n2077\t assert_ne!(\n2078\t id1, id2,\n2079\t \"Two consecutive requests should have different request IDs\"\n2080\t );\n2081\t\n2082\t // Both should still be valid 8-char hex\n2083\t assert_eq!(id1.len(), 8);\n2084\t assert_eq!(id2.len(), 8);\n2085\t }\n2086\t\n2087\t #[tokio::test]\n2088\t async fn test_request_id_middleware_preserves_existing_header() {\n2089\t use axum::{routing::get, Router};\n2090\t use http_body_util::Full;\n2091\t use tower::ServiceExt;\n2092\t\n2093\t // Build a simple router with the request ID middleware\n2094\t let app = Router::new()\n2095\t .route(\"/test\", get(|| async { \"OK\" }))\n2096\t .layer(axum::middleware::from_fn(request_id_middleware));\n2097\t\n2098\t // Create a request with a pre-existing X-Request-Id header\n2099\t let existing_id = \"deadbeef\";\n2100\t let request = Request::builder()\n2101\t .uri(\"/test\")\n2102\t .header(\"x-request-id\", existing_id)\n2103\t .body(Full::default())\n2104\t .unwrap();\n2105\t\n2106\t // Send the request\n2107\t let response = app.oneshot(request).await.unwrap();\n2108\t\n2109\t // Verify the header is preserved\n2110\t let header = response\n2111\t .headers()\n2112\t .get(\"x-request-id\")\n2113\t .expect(\"X-Request-Id header should be present\");\n2114\t let header_value = header.to_str().unwrap();\n2115\t\n2116\t assert_eq!(\n2117\t header_value, existing_id,\n2118\t \"Existing X-Request-Id should be preserved\"\n2119\t );\n2120\t }\n2121\t}\n2122\t"}]},"parent_tool_use_id":null,"session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"b9594772-ba3c-49d4-a279-c25685cf78a6","timestamp":"2026-05-23T06:24:00.320Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/crates/miroir-proxy/src/middleware.rs","content":"//! Structured logging, request IDs, and Prometheus metrics middleware.\n\nuse std::time::Instant;\n\nuse axum::{\n extract::{Request, State},\n http::{HeaderMap, HeaderValue},\n middleware::Next,\n response::Response,\n Router,\n routing::get,\n};\nuse miroir_core::config::MiroirConfig;\nuse prometheus::{\n Counter, CounterVec, Encoder, Gauge, GaugeVec, Histogram, HistogramOpts, HistogramVec, Opts,\n Registry, TextEncoder,\n};\nuse tracing::info_span;\nuse uuid::Uuid;\nuse hex;\nuse std::collections::hash_map::DefaultHasher;\nuse std::hash::{Hash, Hasher};\n\n/// Request ID wrapper type for storing in axum Request extensions.\n///\n/// This is a newtype wrapper around the 8-character hex request ID,\n/// allowing handlers to extract it via `Request.extensions().get::()`.\n#[derive(Clone, Debug, PartialEq, Eq, Hash)]\npub struct RequestId(pub String);\n\nimpl RequestId {\n /// Create a new RequestId from a UUIDv7.\n ///\n /// Hashes the full UUIDv7 to produce an 8-character hex ID that is unique\n /// even for consecutive calls within the same millisecond.\n pub fn new() -> Self {\n let uuid = Uuid::now_v7();\n let bytes = uuid.as_bytes();\n // Hash the full UUID to ensure uniqueness even within the same millisecond\n let mut hasher = DefaultHasher::new();\n hasher.write(bytes);\n let hash = hasher.finish();\n // Take first 8 hex chars of 64-bit hash (32 bits is sufficient entropy)\n Self(format!(\"{:08x}\", hash as u32))\n }\n\n /// Get the inner request ID string.\n pub fn as_str(&self) -> &str {\n &self.0\n }\n\n /// Parse a RequestId from a string.\n pub fn parse(s: String) -> Option {\n if s.len() == 8 && s.chars().all(|c| c.is_ascii_hexdigit()) {\n Some(Self(s))\n } else {\n None\n }\n }\n}\n\n/// Session ID wrapper type for read-your-writes session pinning (plan §13.6).\n///\n/// Extracted from the `X-Miroir-Session` header and stored in request extensions.\n/// Handlers can access it via `Request.extensions().get::()`.\n#[derive(Clone, Debug, PartialEq, Eq, Hash)]\npub struct SessionId(pub String);\n\nimpl Default for SessionId {\n fn default() -> Self {\n Self(String::new())\n }\n}\n\nimpl SessionId {\n /// Get the inner session ID string.\n pub fn as_str(&self) -> &str {\n &self.0\n }\n\n /// Parse a SessionId from a string.\n ///\n /// Accepts any non-empty string (client-provided UUID or identifier).\n pub fn parse(s: String) -> Option {\n if !s.is_empty() && s.len() <= 256 {\n Some(Self(s))\n } else {\n None\n }\n }\n}\n\npub async fn request_id_middleware(\n mut req: Request,\n next: Next,\n) -> Response {\n // Check for existing request ID in headers\n let request_id = req\n .headers()\n .get(\"x-request-id\")\n .and_then(|v| v.to_str().ok())\n .and_then(|s| RequestId::parse(s.to_string()))\n .unwrap_or_else(RequestId::new);\n\n // Store in request extensions for handler access\n req.extensions_mut().insert(request_id.clone());\n\n // Set X-Request-Id header on request (for telemetry_middleware to read)\n if let Ok(val) = HeaderValue::from_str(request_id.as_str()) {\n req.headers_mut().insert(\"x-request-id\", val);\n }\n\n // Process the request\n let mut response = next.run(req).await;\n\n // Add X-Request-Id header to response (override if exists)\n if let Ok(val) = HeaderValue::from_str(request_id.as_str()) {\n response.headers_mut().insert(\"x-request-id\", val);\n }\n\n response\n}\n\n/// Session pinning middleware (plan §13.6).\n///\n/// Extracts the `X-Miroir-Session` header and stores it in request extensions\n/// for handlers to access via `Request.extensions().get::()`.\npub async fn session_pinning_middleware(\n mut req: Request,\n next: Next,\n) -> Response {\n // Extract session ID from header if present\n let session_id = req\n .headers()\n .get(\"x-miroir-session\")\n .and_then(|v| v.to_str().ok())\n .and_then(|s| SessionId::parse(s.to_string()));\n\n // Store in request extensions for handler access\n if let Some(sid) = session_id {\n req.extensions_mut().insert(sid);\n }\n\n next.run(req).await\n}\n\n\n/// Telemetry state combining metrics and pod_id for middleware.\n#[derive(Clone)]\npub struct TelemetryState {\n pub metrics: Metrics,\n pub pod_id: String,\n}\n\nimpl TelemetryState {\n pub fn new(metrics: Metrics) -> Self {\n let pod_id = std::env::var(\"POD_NAME\").unwrap_or_else(|_| \"unknown\".to_string());\n Self { metrics, pod_id }\n }\n}\n\n/// Global metrics registry shared across all middleware instances.\npub struct Metrics {\n registry: Registry,\n\n // ── Request metrics ──\n request_duration: HistogramVec,\n requests_total: CounterVec,\n requests_in_flight: Gauge,\n\n // ── Node health metrics ──\n node_healthy: GaugeVec,\n node_request_duration: HistogramVec,\n node_errors: CounterVec,\n\n // ── Shard metrics ──\n shard_coverage: Gauge,\n degraded_shards: Gauge,\n shard_distribution: GaugeVec,\n\n // ── Task metrics ──\n task_processing_age: Histogram,\n tasks_total: CounterVec,\n task_registry_size: Gauge,\n\n // ── Scatter-gather metrics ──\n scatter_fan_out_size: Histogram,\n scatter_partial_responses: Counter,\n scatter_retries: Counter,\n\n // ── Rebalancer metrics ──\n rebalance_in_progress: Gauge,\n rebalance_documents_migrated: Counter,\n rebalance_duration: Histogram,\n\n // ── §13.11 Multi-search metrics (feature-gated) ──\n multisearch_queries_per_batch: Option,\n multisearch_batches_total: Option,\n multisearch_partial_failures_total: Option,\n multisearch_tenant_session_pin_override_total: Option,\n\n // ── §13.12 Vector search metrics (feature-gated) ──\n vector_search_over_fetched_total: Option,\n vector_merge_strategy: Option,\n vector_embedder_drift_total: Option,\n\n // ── §13.13 CDC metrics (feature-gated) ──\n cdc_events_published_total: Option,\n cdc_lag_seconds: Option,\n cdc_buffer_bytes: Option,\n cdc_dropped_total: Option,\n cdc_events_suppressed_total: Option,\n\n // ── §13.14 TTL metrics (feature-gated) ──\n ttl_documents_expired_total: Option,\n ttl_sweep_duration_seconds: Option,\n ttl_pending_estimate: Option,\n\n // ── §13.15 Tenant affinity metrics (feature-gated) ──\n tenant_queries_total: Option,\n tenant_pinned_groups: Option,\n tenant_fallback_total: Option,\n\n // ── §13.16 Shadow traffic metrics (feature-gated) ──\n shadow_diff_total: Option,\n shadow_kendall_tau: Option,\n shadow_latency_delta_seconds: Option,\n shadow_errors_total: Option,\n\n // ── §13.17 ILM metrics (feature-gated) ──\n rollover_events_total: Option,\n rollover_active_indexes: Option,\n rollover_documents_expired_total: Option,\n rollover_last_action_seconds: Option,\n\n // ── §13.18 Canary metrics (feature-gated) ──\n canary_runs_total: Option,\n canary_latency_ms: Option,\n canary_assertion_failures_total: Option,\n\n // ── §13.19 Admin UI metrics (feature-gated) ──\n admin_ui_sessions_total: Option,\n admin_ui_action_total: Option,\n admin_ui_destructive_action_total: Option,\n\n // ── §13.20 Explain metrics (feature-gated) ──\n explain_requests_total: Option,\n explain_warnings_total: Option,\n explain_execute_total: Option,\n\n // ── §13.21 Search UI metrics (feature-gated) ──\n search_ui_sessions_total: Option,\n search_ui_queries_total: Option,\n search_ui_zero_hits_total: Option,\n search_ui_click_through_total: Option,\n search_ui_p95_ms: Option,\n\n // ── §14.9 Resource-pressure metrics (always present) ──\n memory_pressure: Gauge,\n cpu_throttled_seconds_total: Counter,\n request_queue_depth: Gauge,\n background_queue_depth: GaugeVec,\n peer_pod_count: Gauge,\n leader: Gauge,\n owned_shards_count: Gauge,\n\n // ── Admin session sealing metrics (always present) ──\n admin_session_key_generated: Gauge,\n admin_session_revoked_total: Counter,\n\n // ── §13.5 Two-phase settings broadcast metrics (always present) ──\n settings_broadcast_phase: GaugeVec,\n settings_hash_mismatch_total: Counter,\n settings_drift_repair_total: CounterVec,\n settings_version: GaugeVec,\n\n // ── §13.7 Alias metrics (always present) ──\n alias_resolutions_total: CounterVec,\n alias_flips_total: CounterVec,\n\n // ── §13.6 Session pinning metrics (always present) ──\n session_active_count: Gauge,\n session_pin_enforced_total: CounterVec,\n session_wait_duration_seconds: Histogram,\n session_wait_timeout_total: CounterVec,\n}\n\nimpl Clone for Metrics {\n fn clone(&self) -> Self {\n Self {\n registry: self.registry.clone(),\n request_duration: self.request_duration.clone(),\n requests_total: self.requests_total.clone(),\n requests_in_flight: self.requests_in_flight.clone(),\n node_healthy: self.node_healthy.clone(),\n node_request_duration: self.node_request_duration.clone(),\n node_errors: self.node_errors.clone(),\n shard_coverage: self.shard_coverage.clone(),\n degraded_shards: self.degraded_shards.clone(),\n shard_distribution: self.shard_distribution.clone(),\n task_processing_age: self.task_processing_age.clone(),\n tasks_total: self.tasks_total.clone(),\n task_registry_size: self.task_registry_size.clone(),\n scatter_fan_out_size: self.scatter_fan_out_size.clone(),\n scatter_partial_responses: self.scatter_partial_responses.clone(),\n scatter_retries: self.scatter_retries.clone(),\n rebalance_in_progress: self.rebalance_in_progress.clone(),\n rebalance_documents_migrated: self.rebalance_documents_migrated.clone(),\n rebalance_duration: self.rebalance_duration.clone(),\n multisearch_queries_per_batch: self.multisearch_queries_per_batch.clone(),\n multisearch_batches_total: self.multisearch_batches_total.clone(),\n multisearch_partial_failures_total: self.multisearch_partial_failures_total.clone(),\n multisearch_tenant_session_pin_override_total: self.multisearch_tenant_session_pin_override_total.clone(),\n vector_search_over_fetched_total: self.vector_search_over_fetched_total.clone(),\n vector_merge_strategy: self.vector_merge_strategy.clone(),\n vector_embedder_drift_total: self.vector_embedder_drift_total.clone(),\n cdc_events_published_total: self.cdc_events_published_total.clone(),\n cdc_lag_seconds: self.cdc_lag_seconds.clone(),\n cdc_buffer_bytes: self.cdc_buffer_bytes.clone(),\n cdc_dropped_total: self.cdc_dropped_total.clone(),\n cdc_events_suppressed_total: self.cdc_events_suppressed_total.clone(),\n ttl_documents_expired_total: self.ttl_documents_expired_total.clone(),\n ttl_sweep_duration_seconds: self.ttl_sweep_duration_seconds.clone(),\n ttl_pending_estimate: self.ttl_pending_estimate.clone(),\n tenant_queries_total: self.tenant_queries_total.clone(),\n tenant_pinned_groups: self.tenant_pinned_groups.clone(),\n tenant_fallback_total: self.tenant_fallback_total.clone(),\n shadow_diff_total: self.shadow_diff_total.clone(),\n shadow_kendall_tau: self.shadow_kendall_tau.clone(),\n shadow_latency_delta_seconds: self.shadow_latency_delta_seconds.clone(),\n shadow_errors_total: self.shadow_errors_total.clone(),\n rollover_events_total: self.rollover_events_total.clone(),\n rollover_active_indexes: self.rollover_active_indexes.clone(),\n rollover_documents_expired_total: self.rollover_documents_expired_total.clone(),\n rollover_last_action_seconds: self.rollover_last_action_seconds.clone(),\n canary_runs_total: self.canary_runs_total.clone(),\n canary_latency_ms: self.canary_latency_ms.clone(),\n canary_assertion_failures_total: self.canary_assertion_failures_total.clone(),\n admin_ui_sessions_total: self.admin_ui_sessions_total.clone(),\n admin_ui_action_total: self.admin_ui_action_total.clone(),\n admin_ui_destructive_action_total: self.admin_ui_destructive_action_total.clone(),\n explain_requests_total: self.explain_requests_total.clone(),\n explain_warnings_total: self.explain_warnings_total.clone(),\n explain_execute_total: self.explain_execute_total.clone(),\n search_ui_sessions_total: self.search_ui_sessions_total.clone(),\n search_ui_queries_total: self.search_ui_queries_total.clone(),\n search_ui_zero_hits_total: self.search_ui_zero_hits_total.clone(),\n search_ui_click_through_total: self.search_ui_click_through_total.clone(),\n search_ui_p95_ms: self.search_ui_p95_ms.clone(),\n memory_pressure: self.memory_pressure.clone(),\n cpu_throttled_seconds_total: self.cpu_throttled_seconds_total.clone(),\n request_queue_depth: self.request_queue_depth.clone(),\n background_queue_depth: self.background_queue_depth.clone(),\n peer_pod_count: self.peer_pod_count.clone(),\n leader: self.leader.clone(),\n owned_shards_count: self.owned_shards_count.clone(),\n admin_session_key_generated: self.admin_session_key_generated.clone(),\n admin_session_revoked_total: self.admin_session_revoked_total.clone(),\n settings_broadcast_phase: self.settings_broadcast_phase.clone(),\n settings_hash_mismatch_total: self.settings_hash_mismatch_total.clone(),\n settings_drift_repair_total: self.settings_drift_repair_total.clone(),\n settings_version: self.settings_version.clone(),\n alias_resolutions_total: self.alias_resolutions_total.clone(),\n alias_flips_total: self.alias_flips_total.clone(),\n session_active_count: self.session_active_count.clone(),\n session_pin_enforced_total: self.session_pin_enforced_total.clone(),\n session_wait_duration_seconds: self.session_wait_duration_seconds.clone(),\n session_wait_timeout_total: self.session_wait_timeout_total.clone(),\n }\n }\n}\n\nimpl Default for Metrics {\n fn default() -> Self {\n Self::new(&MiroirConfig::default())\n }\n}\n\nimpl Metrics {\n pub fn new(config: &MiroirConfig) -> Self {\n let registry = Registry::new();\n\n // ── Request metrics ──\n let request_duration = HistogramVec::new(\n HistogramOpts::new(\"miroir_request_duration_seconds\", \"Request latency in seconds\")\n .buckets(vec![0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0, 10.0]),\n &[\"method\", \"path_template\", \"status\"],\n )\n .expect(\"failed to create request_duration histogram\");\n\n let requests_total = CounterVec::new(\n Opts::new(\"miroir_requests_total\", \"Total number of requests\"),\n &[\"method\", \"path_template\", \"status\"],\n )\n .expect(\"failed to create requests_total counter\");\n\n let requests_in_flight = Gauge::with_opts(\n Opts::new(\"miroir_requests_in_flight\", \"Number of requests currently being processed\"),\n )\n .expect(\"failed to create requests_in_flight gauge\");\n\n // ── Node health metrics ──\n let node_healthy = GaugeVec::new(\n Opts::new(\"miroir_node_healthy\", \"Health status of backend nodes (1=healthy, 0=unhealthy)\"),\n &[\"node_id\"],\n )\n .expect(\"failed to create node_healthy gauge\");\n\n let node_request_duration = HistogramVec::new(\n HistogramOpts::new(\"miroir_node_request_duration_seconds\", \"Latency of individual node requests\")\n .buckets(vec![0.001, 0.005, 0.01, 0.025, 0.05, 0.1, 0.5, 1.0]),\n &[\"node_id\", \"operation\"],\n )\n .expect(\"failed to create node_request_duration histogram\");\n\n let node_errors = CounterVec::new(\n Opts::new(\"miroir_node_errors_total\", \"Number of errors from backend nodes\"),\n &[\"node_id\", \"error_type\"],\n )\n .expect(\"failed to create node_errors counter\");\n\n // ── Shard metrics ──\n let shard_coverage = Gauge::with_opts(\n Opts::new(\"miroir_shard_coverage\", \"Fraction of shards with at least one healthy replica\"),\n )\n .expect(\"failed to create shard_coverage gauge\");\n\n let degraded_shards = Gauge::with_opts(\n Opts::new(\"miroir_degraded_shards_total\", \"Number of shards with reduced replica availability\"),\n )\n .expect(\"failed to create degraded_shards gauge\");\n\n let shard_distribution = GaugeVec::new(\n Opts::new(\"miroir_shard_distribution\", \"Number of shards assigned to each node\"),\n &[\"node_id\"],\n )\n .expect(\"failed to create shard_distribution gauge\");\n\n // ── Task metrics ──\n let task_processing_age = Histogram::with_opts(\n HistogramOpts::new(\"miroir_task_processing_age_seconds\", \"Time between task creation and processing start\")\n .buckets(vec![0.01, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0, 10.0, 30.0, 60.0]),\n )\n .expect(\"failed to create task_processing_age histogram\");\n\n let tasks_total = CounterVec::new(\n Opts::new(\"miroir_tasks_total\", \"Total number of tasks by status\"),\n &[\"status\"],\n )\n .expect(\"failed to create tasks_total counter\");\n\n let task_registry_size = Gauge::with_opts(\n Opts::new(\"miroir_task_registry_size\", \"Current number of tasks in the registry\"),\n )\n .expect(\"failed to create task_registry_size gauge\");\n\n // ── Scatter-gather metrics ──\n let scatter_fan_out_size = Histogram::with_opts(\n HistogramOpts::new(\"miroir_scatter_fan_out_size\", \"Number of nodes in scatter operations\")\n .buckets(vec![1.0, 2.0, 3.0, 5.0, 10.0, 20.0, 50.0]),\n )\n .expect(\"failed to create scatter_fan_out_size histogram\");\n\n let scatter_partial_responses = Counter::with_opts(\n Opts::new(\"miroir_scatter_partial_responses_total\", \"Number of scatter responses that were partial (some nodes failed)\"),\n )\n .expect(\"failed to create scatter_partial_responses counter\");\n\n let scatter_retries = Counter::with_opts(\n Opts::new(\"miroir_scatter_retries_total\", \"Number of scatter retry attempts due to node failures\"),\n )\n .expect(\"failed to create scatter_retries counter\");\n\n // ── Rebalancer metrics ──\n let rebalance_in_progress = Gauge::with_opts(\n Opts::new(\"miroir_rebalance_in_progress\", \"Whether a rebalance is currently running (1=yes, 0=no)\"),\n )\n .expect(\"failed to create rebalance_in_progress gauge\");\n\n let rebalance_documents_migrated = Counter::with_opts(\n Opts::new(\"miroir_rebalance_documents_migrated_total\", \"Total number of documents migrated during rebalance\"),\n )\n .expect(\"failed to create rebalance_documents_migrated counter\");\n\n let rebalance_duration = Histogram::with_opts(\n HistogramOpts::new(\"miroir_rebalance_duration_seconds\", \"Duration of rebalance operations\")\n .buckets(vec![1.0, 5.0, 10.0, 30.0, 60.0, 300.0, 600.0, 1800.0, 3600.0]),\n )\n .expect(\"failed to create rebalance_duration histogram\");\n\n // Register all metrics\n macro_rules! reg {\n ($m:expr) => {\n registry.register(Box::new($m.clone())).expect(concat!(\"failed to register \", stringify!($m)));\n };\n }\n\n reg!(request_duration);\n reg!(requests_total);\n reg!(requests_in_flight);\n reg!(node_healthy);\n reg!(node_request_duration);\n reg!(node_errors);\n reg!(shard_coverage);\n reg!(degraded_shards);\n reg!(shard_distribution);\n reg!(task_processing_age);\n reg!(tasks_total);\n reg!(task_registry_size);\n reg!(scatter_fan_out_size);\n reg!(scatter_partial_responses);\n reg!(scatter_retries);\n reg!(rebalance_in_progress);\n reg!(rebalance_documents_migrated);\n reg!(rebalance_duration);\n\n // ── §13.11 Multi-search metrics (cardinality cap: top 100 tenants, rest bucketed) ──\n let (\n multisearch_queries_per_batch,\n multisearch_batches_total,\n multisearch_partial_failures_total,\n multisearch_tenant_session_pin_override_total,\n ) = if config.multi_search.enabled {\n let q = Histogram::with_opts(\n HistogramOpts::new(\"miroir_multisearch_queries_per_batch\", \"Number of queries in each multi-search batch\")\n .buckets(vec![1.0, 2.0, 5.0, 10.0, 25.0, 50.0, 100.0]),\n ).expect(\"create multisearch_queries_per_batch\");\n let b = Counter::with_opts(\n Opts::new(\"miroir_multisearch_batches_total\", \"Total number of multi-search batches processed\"),\n ).expect(\"create multisearch_batches_total\");\n let p = Counter::with_opts(\n Opts::new(\"miroir_multisearch_partial_failures_total\", \"Number of multi-search batches with at least one query failure\"),\n ).expect(\"create multisearch_partial_failures_total\");\n let t = CounterVec::new(\n Opts::new(\"miroir_tenant_session_pin_override_total\", \"Session pin overrides triggered by multi-search tenant routing\"),\n &[\"tenant\"],\n ).expect(\"create multisearch_tenant_session_pin_override_total\");\n reg!(q); reg!(b); reg!(p); reg!(t);\n (Some(q), Some(b), Some(p), Some(t))\n } else {\n (None, None, None, None)\n };\n\n // ── §13.12 Vector search metrics ──\n let (\n vector_search_over_fetched_total,\n vector_merge_strategy,\n vector_embedder_drift_total,\n ) = if config.vector_search.enabled {\n let o = Counter::with_opts(\n Opts::new(\"miroir_vector_search_over_fetched_total\", \"Number of vector searches that over-fetched candidates\"),\n ).expect(\"create vector_search_over_fetched_total\");\n let m = CounterVec::new(\n Opts::new(\"miroir_vector_merge_strategy\", \"Count of hybrid merge strategy selections\"),\n &[\"strategy\"],\n ).expect(\"create vector_merge_strategy\");\n let d = Counter::with_opts(\n Opts::new(\"miroir_vector_embedder_drift_total\", \"Number of embedder drift detections\"),\n ).expect(\"create vector_embedder_drift_total\");\n reg!(o); reg!(m); reg!(d);\n (Some(o), Some(m), Some(d))\n } else {\n (None, None, None)\n };\n\n // ── §13.13 CDC metrics (cardinality cap: top 100 sinks, rest bucketed) ──\n let (\n cdc_events_published_total,\n cdc_lag_seconds,\n cdc_buffer_bytes,\n cdc_dropped_total,\n cdc_events_suppressed_total,\n ) = if config.cdc.enabled {\n let e = CounterVec::new(\n Opts::new(\"miroir_cdc_events_published_total\", \"Total CDC events published\"),\n &[\"sink\", \"index\"],\n ).expect(\"create cdc_events_published_total\");\n let l = GaugeVec::new(\n Opts::new(\"miroir_cdc_lag_seconds\", \"CDC delivery lag in seconds\"),\n &[\"sink\"],\n ).expect(\"create cdc_lag_seconds\");\n let b = GaugeVec::new(\n Opts::new(\"miroir_cdc_buffer_bytes\", \"CDC buffer size in bytes\"),\n &[\"sink\"],\n ).expect(\"create cdc_buffer_bytes\");\n let d = CounterVec::new(\n Opts::new(\"miroir_cdc_dropped_total\", \"CDC events dropped due to buffer overflow\"),\n &[\"sink\"],\n ).expect(\"create cdc_dropped_total\");\n let s = CounterVec::new(\n Opts::new(\"miroir_cdc_events_suppressed_total\", \"CDC events suppressed by origin deduplication\"),\n &[\"origin\"],\n ).expect(\"create cdc_events_suppressed_total\");\n reg!(e); reg!(l); reg!(b); reg!(d); reg!(s);\n (Some(e), Some(l), Some(b), Some(d), Some(s))\n } else {\n (None, None, None, None, None)\n };\n\n // ── §13.14 TTL metrics (cardinality cap: top 100 indexes, rest bucketed) ──\n let (\n ttl_documents_expired_total,\n ttl_sweep_duration_seconds,\n ttl_pending_estimate,\n ) = if config.ttl.enabled {\n let e = CounterVec::new(\n Opts::new(\"miroir_ttl_documents_expired_total\", \"Documents expired by TTL sweeper\"),\n &[\"index\"],\n ).expect(\"create ttl_documents_expired_total\");\n let d = HistogramVec::new(\n HistogramOpts::new(\"miroir_ttl_sweep_duration_seconds\", \"Duration of TTL sweep cycles\")\n .buckets(vec![0.01, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0, 10.0]),\n &[\"index\"],\n ).expect(\"create ttl_sweep_duration_seconds\");\n let p = GaugeVec::new(\n Opts::new(\"miroir_ttl_pending_estimate\", \"Estimated documents pending TTL expiry\"),\n &[\"index\"],\n ).expect(\"create ttl_pending_estimate\");\n reg!(e); reg!(d); reg!(p);\n (Some(e), Some(d), Some(p))\n } else {\n (None, None, None)\n };\n\n // ── §13.15 Tenant affinity metrics (cardinality cap: top 100 tenants, rest bucketed) ──\n let (\n tenant_queries_total,\n tenant_pinned_groups,\n tenant_fallback_total,\n ) = if config.tenant_affinity.enabled {\n let q = CounterVec::new(\n Opts::new(\"miroir_tenant_queries_total\", \"Queries routed per tenant and group\"),\n &[\"tenant\", \"group\"],\n ).expect(\"create tenant_queries_total\");\n let p = GaugeVec::new(\n Opts::new(\"miroir_tenant_pinned_groups\", \"Current pinned group per tenant\"),\n &[\"tenant\"],\n ).expect(\"create tenant_pinned_groups\");\n let f = CounterVec::new(\n Opts::new(\"miroir_tenant_fallback_total\", \"Tenant affinity fallback invocations\"),\n &[\"reason\"],\n ).expect(\"create tenant_fallback_total\");\n reg!(q); reg!(p); reg!(f);\n (Some(q), Some(p), Some(f))\n } else {\n (None, None, None)\n };\n\n // ── §13.16 Shadow traffic metrics ──\n let (\n shadow_diff_total,\n shadow_kendall_tau,\n shadow_latency_delta_seconds,\n shadow_errors_total,\n ) = if config.shadow.enabled {\n let d = CounterVec::new(\n Opts::new(\"miroir_shadow_diff_total\", \"Shadow comparison diffs by kind\"),\n &[\"kind\"],\n ).expect(\"create shadow_diff_total\");\n let k = Gauge::with_opts(\n Opts::new(\"miroir_shadow_kendall_tau\", \"Kendall tau rank correlation between shadow and primary\"),\n ).expect(\"create shadow_kendall_tau\");\n let l = Histogram::with_opts(\n HistogramOpts::new(\"miroir_shadow_latency_delta_seconds\", \"Latency difference between shadow and primary\")\n .buckets(vec![-1.0, -0.5, -0.1, -0.01, 0.0, 0.01, 0.1, 0.5, 1.0]),\n ).expect(\"create shadow_latency_delta_seconds\");\n let e = CounterVec::new(\n Opts::new(\"miroir_shadow_errors_total\", \"Shadow pipeline errors\"),\n &[\"target\", \"side\"],\n ).expect(\"create shadow_errors_total\");\n reg!(d); reg!(k); reg!(l); reg!(e);\n (Some(d), Some(k), Some(l), Some(e))\n } else {\n (None, None, None, None)\n };\n\n // ── §13.17 ILM metrics (cardinality cap: top 100 policies/aliases, rest bucketed) ──\n let (\n rollover_events_total,\n rollover_active_indexes,\n rollover_documents_expired_total,\n rollover_last_action_seconds,\n ) = if config.ilm.enabled {\n let e = CounterVec::new(\n Opts::new(\"miroir_rollover_events_total\", \"ILM rollover events\"),\n &[\"policy\"],\n ).expect(\"create rollover_events_total\");\n let a = GaugeVec::new(\n Opts::new(\"miroir_rollover_active_indexes\", \"Active write indexes per alias\"),\n &[\"alias\"],\n ).expect(\"create rollover_active_indexes\");\n let d = CounterVec::new(\n Opts::new(\"miroir_rollover_documents_expired_total\", \"Documents expired by ILM retention policies\"),\n &[\"policy\"],\n ).expect(\"create rollover_documents_expired_total\");\n let l = GaugeVec::new(\n Opts::new(\"miroir_rollover_last_action_seconds\", \"Seconds since last rollover action per policy\"),\n &[\"policy\"],\n ).expect(\"create rollover_last_action_seconds\");\n reg!(e); reg!(a); reg!(d); reg!(l);\n (Some(e), Some(a), Some(d), Some(l))\n } else {\n (None, None, None, None)\n };\n\n // ── §13.18 Canary metrics (cardinality cap: top 100 canaries, rest bucketed) ──\n let (\n canary_runs_total,\n canary_latency_ms,\n canary_assertion_failures_total,\n ) = if config.canary_runner.enabled {\n let r = CounterVec::new(\n Opts::new(\"miroir_canary_runs_total\", \"Canary run results\"),\n &[\"canary\", \"result\"],\n ).expect(\"create canary_runs_total\");\n let l = HistogramVec::new(\n HistogramOpts::new(\"miroir_canary_latency_ms\", \"Canary execution latency\")\n .buckets(vec![1.0, 5.0, 10.0, 25.0, 50.0, 100.0, 250.0, 500.0, 1000.0]),\n &[\"canary\"],\n ).expect(\"create canary_latency_ms\");\n let a = CounterVec::new(\n Opts::new(\"miroir_canary_assertion_failures_total\", \"Canary assertion failures\"),\n &[\"canary\", \"assertion_type\"],\n ).expect(\"create canary_assertion_failures_total\");\n reg!(r); reg!(l); reg!(a);\n (Some(r), Some(l), Some(a))\n } else {\n (None, None, None)\n };\n\n // ── §13.19 Admin UI metrics ──\n let (\n admin_ui_sessions_total,\n admin_ui_action_total,\n admin_ui_destructive_action_total,\n ) = if config.admin_ui.enabled {\n let s = Counter::with_opts(\n Opts::new(\"miroir_admin_ui_sessions_total\", \"Admin UI sessions started\"),\n ).expect(\"create admin_ui_sessions_total\");\n let a = CounterVec::new(\n Opts::new(\"miroir_admin_ui_action_total\", \"Admin UI actions by type\"),\n &[\"action\"],\n ).expect(\"create admin_ui_action_total\");\n let d = CounterVec::new(\n Opts::new(\"miroir_admin_ui_destructive_action_total\", \"Admin UI destructive actions (delete, drop, etc.)\"),\n &[\"action\"],\n ).expect(\"create admin_ui_destructive_action_total\");\n reg!(s); reg!(a); reg!(d);\n (Some(s), Some(a), Some(d))\n } else {\n (None, None, None)\n };\n\n // ── §13.20 Explain metrics ──\n let (\n explain_requests_total,\n explain_warnings_total,\n explain_execute_total,\n ) = if config.explain.enabled {\n let r = Counter::with_opts(\n Opts::new(\"miroir_explain_requests_total\", \"Explain API requests\"),\n ).expect(\"create explain_requests_total\");\n let w = CounterVec::new(\n Opts::new(\"miroir_explain_warnings_total\", \"Explain warnings by type\"),\n &[\"warning_type\"],\n ).expect(\"create explain_warnings_total\");\n let e = Counter::with_opts(\n Opts::new(\"miroir_explain_execute_total\", \"Explain requests with execute=true\"),\n ).expect(\"create explain_execute_total\");\n reg!(r); reg!(w); reg!(e);\n (Some(r), Some(w), Some(e))\n } else {\n (None, None, None)\n };\n\n // ── §13.21 Search UI metrics (cardinality cap: top 100 indexes, rest bucketed) ──\n let (\n search_ui_sessions_total,\n search_ui_queries_total,\n search_ui_zero_hits_total,\n search_ui_click_through_total,\n search_ui_p95_ms,\n ) = if config.search_ui.enabled {\n let s = Counter::with_opts(\n Opts::new(\"miroir_search_ui_sessions_total\", \"Search UI sessions\"),\n ).expect(\"create search_ui_sessions_total\");\n let q = CounterVec::new(\n Opts::new(\"miroir_search_ui_queries_total\", \"Search UI queries per index\"),\n &[\"index\"],\n ).expect(\"create search_ui_queries_total\");\n let z = CounterVec::new(\n Opts::new(\"miroir_search_ui_zero_hits_total\", \"Search UI zero-hit queries per index\"),\n &[\"index\"],\n ).expect(\"create search_ui_zero_hits_total\");\n let c = CounterVec::new(\n Opts::new(\"miroir_search_ui_click_through_total\", \"Search UI click-through events per index\"),\n &[\"index\"],\n ).expect(\"create search_ui_click_through_total\");\n let p = GaugeVec::new(\n Opts::new(\"miroir_search_ui_p95_ms\", \"Search UI p95 query latency per index\"),\n &[\"index\"],\n ).expect(\"create search_ui_p95_ms\");\n reg!(s); reg!(q); reg!(z); reg!(c); reg!(p);\n (Some(s), Some(q), Some(z), Some(c), Some(p))\n } else {\n (None, None, None, None, None)\n };\n\n // ── §14.9 Resource-pressure metrics (always present) ──\n let memory_pressure = Gauge::with_opts(\n Opts::new(\"miroir_memory_pressure\", \"Memory pressure level (0=none, 1=low, 2=moderate/high)\")\n ).expect(\"create memory_pressure\");\n let cpu_throttled_seconds_total = Counter::with_opts(\n Opts::new(\"miroir_cpu_throttled_seconds_total\", \"Total seconds of CPU throttling\")\n ).expect(\"create cpu_throttled_seconds_total\");\n let request_queue_depth = Gauge::with_opts(\n Opts::new(\"miroir_request_queue_depth\", \"Number of requests queued waiting for processing\")\n ).expect(\"create request_queue_depth\");\n let background_queue_depth = GaugeVec::new(\n Opts::new(\"miroir_background_queue_depth\", \"Number of background jobs queued by type\"),\n &[\"job_type\"],\n ).expect(\"create background_queue_depth\");\n let peer_pod_count = Gauge::with_opts(\n Opts::new(\"miroir_peer_pod_count\", \"Number of peer miroir pods discovered\")\n ).expect(\"create peer_pod_count\");\n let leader = Gauge::with_opts(\n Opts::new(\"miroir_leader\", \"Whether this pod holds the leader lease (1=yes, 0=no)\")\n ).expect(\"create leader\");\n let owned_shards_count = Gauge::with_opts(\n Opts::new(\"miroir_owned_shards_count\", \"Number of shards owned by this pod\")\n ).expect(\"create owned_shards_count\");\n reg!(memory_pressure);\n reg!(cpu_throttled_seconds_total);\n reg!(request_queue_depth);\n reg!(background_queue_depth);\n reg!(peer_pod_count);\n reg!(leader);\n reg!(owned_shards_count);\n\n // ── Admin session sealing metrics (always present) ──\n let admin_session_key_generated = Gauge::with_opts(\n Opts::new(\"miroir_admin_session_key_generated\",\n \"Whether ADMIN_SESSION_SEAL_KEY was generated at startup (1=yes, 0=set via env)\")\n ).expect(\"create admin_session_key_generated\");\n let admin_session_revoked_total = Counter::with_opts(\n Opts::new(\"miroir_admin_session_revoked_total\",\n \"Admin sessions revoked via logout\")\n ).expect(\"create admin_session_revoked_total\");\n reg!(admin_session_key_generated);\n reg!(admin_session_revoked_total);\n\n // ── §13.5 Two-phase settings broadcast metrics (always present) ──\n let settings_broadcast_phase = GaugeVec::new(\n Opts::new(\"miroir_settings_broadcast_phase\", \"Current phase of settings broadcast (0=idle, 1=propose, 2=verify, 3=commit)\"),\n &[\"index\"],\n ).expect(\"create settings_broadcast_phase\");\n let settings_hash_mismatch_total = Counter::with_opts(\n Opts::new(\"miroir_settings_hash_mismatch_total\", \"Settings hash mismatches detected during verify phase\"),\n ).expect(\"create settings_hash_mismatch_total\");\n let settings_drift_repair_total = CounterVec::new(\n Opts::new(\"miroir_settings_drift_repair_total\", \"Settings drift repairs performed by drift reconciler\"),\n &[\"index\"],\n ).expect(\"create settings_drift_repair_total\");\n let settings_version = GaugeVec::new(\n Opts::new(\"miroir_settings_version\", \"Current settings version per index\"),\n &[\"index\"],\n ).expect(\"create settings_version\");\n reg!(settings_broadcast_phase);\n reg!(settings_hash_mismatch_total);\n reg!(settings_drift_repair_total);\n reg!(settings_version);\n\n // ── §13.7 Alias metrics (always present) ──\n let alias_resolutions_total = CounterVec::new(\n Opts::new(\"miroir_alias_resolutions_total\", \"Number of alias resolutions\"),\n &[\"alias\"],\n ).expect(\"create alias_resolutions_total\");\n let alias_flips_total = CounterVec::new(\n Opts::new(\"miroir_alias_flips_total\", \"Number of alias flips\"),\n &[\"alias\"],\n ).expect(\"create alias_flips_total\");\n reg!(alias_resolutions_total);\n reg!(alias_flips_total);\n\n // ── §13.6 Session pinning metrics (always present) ──\n let session_active_count = Gauge::new(\n \"miroir_session_active_count\",\n \"Number of active sessions\",\n ).expect(\"create session_active_count\");\n let session_pin_enforced_total = CounterVec::new(\n Opts::new(\"miroir_session_pin_enforced_total\", \"Number of times session pin was enforced\"),\n &[\"strategy\"],\n ).expect(\"create session_pin_enforced_total\");\n let session_wait_duration_seconds = Histogram::with_opts(\n HistogramOpts::new(\n \"miroir_session_wait_duration_seconds\",\n \"Duration of session pin wait operations\",\n )\n .buckets(vec![0.001, 0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0]),\n ).expect(\"create session_wait_duration_seconds\");\n let session_wait_timeout_total = CounterVec::new(\n Opts::new(\"miroir_session_wait_timeout_total\", \"Number of session pin wait timeouts\"),\n &[\"strategy\"],\n ).expect(\"create session_wait_timeout_total\");\n reg!(session_active_count);\n reg!(session_pin_enforced_total);\n reg!(session_wait_duration_seconds);\n reg!(session_wait_timeout_total);\n\n Self {\n registry,\n request_duration,\n requests_total,\n requests_in_flight,\n node_healthy,\n node_request_duration,\n node_errors,\n shard_coverage,\n degraded_shards,\n shard_distribution,\n task_processing_age,\n tasks_total,\n task_registry_size,\n scatter_fan_out_size,\n scatter_partial_responses,\n scatter_retries,\n rebalance_in_progress,\n rebalance_documents_migrated,\n rebalance_duration,\n multisearch_queries_per_batch,\n multisearch_batches_total,\n multisearch_partial_failures_total,\n multisearch_tenant_session_pin_override_total,\n vector_search_over_fetched_total,\n vector_merge_strategy,\n vector_embedder_drift_total,\n cdc_events_published_total,\n cdc_lag_seconds,\n cdc_buffer_bytes,\n cdc_dropped_total,\n cdc_events_suppressed_total,\n ttl_documents_expired_total,\n ttl_sweep_duration_seconds,\n ttl_pending_estimate,\n tenant_queries_total,\n tenant_pinned_groups,\n tenant_fallback_total,\n shadow_diff_total,\n shadow_kendall_tau,\n shadow_latency_delta_seconds,\n shadow_errors_total,\n rollover_events_total,\n rollover_active_indexes,\n rollover_documents_expired_total,\n rollover_last_action_seconds,\n canary_runs_total,\n canary_latency_ms,\n canary_assertion_failures_total,\n admin_ui_sessions_total,\n admin_ui_action_total,\n admin_ui_destructive_action_total,\n explain_requests_total,\n explain_warnings_total,\n explain_execute_total,\n search_ui_sessions_total,\n search_ui_queries_total,\n search_ui_zero_hits_total,\n search_ui_click_through_total,\n search_ui_p95_ms,\n memory_pressure,\n cpu_throttled_seconds_total,\n request_queue_depth,\n background_queue_depth,\n peer_pod_count,\n leader,\n owned_shards_count,\n admin_session_key_generated,\n admin_session_revoked_total,\n settings_broadcast_phase,\n settings_hash_mismatch_total,\n settings_drift_repair_total,\n settings_version,\n alias_resolutions_total,\n alias_flips_total,\n session_active_count,\n session_pin_enforced_total,\n session_wait_duration_seconds,\n session_wait_timeout_total,\n }\n }\n\n pub fn encode_metrics(&self) -> Result {\n let encoder = TextEncoder::new();\n let metric_families = self.registry.gather();\n let mut buffer = Vec::new();\n encoder.encode(&metric_families, &mut buffer)?;\n Ok(String::from_utf8(buffer).map_err(|e| {\n prometheus::Error::Msg(format!(\"failed to convert metrics to UTF-8: {}\", e))\n })?)\n }\n\n pub fn admin_session_key_generated(&self) -> Gauge {\n self.admin_session_key_generated.clone()\n }\n\n pub fn admin_session_revoked_total(&self) -> Counter {\n self.admin_session_revoked_total.clone()\n }\n}\n\n/// Generate a short request ID from UUIDv7.\n///\n/// UUIDv7 provides time-ordered unique IDs. We take the first 8 hex characters,\n/// hash them, and encode as hex for a short, URL-safe identifier.\npub fn generate_request_id() -> String {\n let uuid = Uuid::now_v7();\n let uuid_str = uuid.simple().to_string();\n // Take first 8 chars (enough entropy for uniqueness)\n let prefix = &uuid_str[..8];\n\n // Hash to get a consistent short representation\n let mut hasher = DefaultHasher::new();\n prefix.hash(&mut hasher);\n let hash = hasher.finish();\n\n // Encode as hex (16 chars = 64 bits)\n format!(\"{:016x}\", hash)\n}\n\n/// Extension trait to add request ID extraction utilities.\npub trait RequestIdExt {\n fn get_request_id(&self) -> Option;\n fn set_request_id(&mut self, id: &str);\n}\n\nimpl RequestIdExt for HeaderMap {\n fn get_request_id(&self) -> Option {\n self.get(\"x-request-id\")\n .and_then(|v| v.to_str().ok())\n .map(|s| s.to_string())\n }\n\n fn set_request_id(&mut self, id: &str) {\n if let Ok(val) = HeaderValue::from_str(id) {\n self.insert(\"x-request-id\", val);\n }\n }\n}\n\n/// Guard that decrements the in-flight gauge when dropped.\n///\n/// This ensures that even if the handler panics, the in-flight count\n/// is accurately decremented.\nstruct InFlightGuard {\n metrics: Metrics,\n request_id: String,\n}\n\nimpl InFlightGuard {\n fn new(metrics: Metrics, request_id: String) -> Self {\n metrics.requests_in_flight.inc();\n tracing::trace!(\n request_id = %request_id,\n requests_in_flight = metrics.requests_in_flight.get(),\n \"request started\"\n );\n Self { metrics, request_id }\n }\n}\n\nimpl Drop for InFlightGuard {\n fn drop(&mut self) {\n self.metrics.requests_in_flight.dec();\n tracing::trace!(\n request_id = %self.request_id,\n requests_in_flight = self.metrics.requests_in_flight.get(),\n \"request completed\"\n );\n }\n}\n\n/// Extract the path template from the matched route.\n///\n/// Axum's MatchedPath extractor provides the route template (e.g., \"/indexes/{uid}/search\")\n/// instead of the actual path (e.g., \"/indexes/products/search\"), avoiding high-cardinality labels.\nfn extract_path_template(request: &Request) -> String {\n request\n .extensions()\n .get::()\n .map(|mp| mp.as_str())\n .unwrap_or_else(|| request.uri().path())\n .to_string()\n}\n\n/// Main middleware that combines request ID injection, structured logging, and Prometheus metrics.\n///\n/// IMPORTANT: This middleware must be applied AFTER request_id_middleware in the layer stack\n/// (i.e., its layer() call must come BEFORE request_id_middleware's layer() call).\n/// This ensures the request_id header is already set when this middleware runs.\npub async fn telemetry_middleware(\n State(telemetry): State,\n mut req: Request,\n next: Next,\n) -> Response {\n let start = Instant::now();\n let method = req.method().clone();\n let path_template = extract_path_template(&req);\n let metrics = telemetry.metrics.clone();\n let pod_id = telemetry.pod_id.clone();\n\n // Extract request ID from header (set by request_id_middleware)\n // The header must already exist because request_id_middleware runs first.\n let request_id = req\n .headers()\n .get_request_id()\n .expect(\"request_id header must be set by request_id_middleware\");\n req.headers_mut().set_request_id(&request_id);\n\n // Create span for structured logging with pod_id included.\n // Note: raw path is intentionally omitted to avoid logging index names\n // (which may contain customer identifiers). Use path_template instead.\n let span = info_span!(\n \"request\",\n request_id = %request_id,\n pod_id = %pod_id,\n method = %method,\n path_template = %path_template,\n );\n\n let _guard = span.enter();\n\n // Track in-flight requests\n let in_flight = InFlightGuard::new(metrics.clone(), request_id.clone());\n\n let response = next.run(req).await;\n\n drop(in_flight);\n\n let status = response.status();\n let status_u16 = status.as_u16();\n let duration = start.elapsed();\n\n // Record Prometheus metrics\n metrics\n .request_duration\n .with_label_values(&[method.as_str(), &path_template, &status_u16.to_string()])\n .observe(duration.as_secs_f64());\n metrics\n .requests_total\n .with_label_values(&[method.as_str(), &path_template, &status_u16.to_string()])\n .inc();\n\n // Structured log entry (plan §10 shape)\n // Base fields: timestamp (from tracing-subscriber), level, message, duration_ms\n // Additional fields (index, node_count, estimated_hits, degraded)\n // are added by request handlers via the tracing span.\n let message = format!(\"{} {}\", method, status);\n if status.is_server_error() {\n tracing::error!(\n target: \"miroir.request\",\n pod_id = %pod_id,\n request_id = %request_id,\n message = %message,\n duration_ms = duration.as_millis() as u64,\n status = status_u16,\n method = %method,\n path_template = %path_template,\n );\n } else if status.is_client_error() {\n tracing::warn!(\n target: \"miroir.request\",\n pod_id = %pod_id,\n request_id = %request_id,\n message = %message,\n duration_ms = duration.as_millis() as u64,\n status = status_u16,\n method = %method,\n path_template = %path_template,\n );\n } else {\n tracing::info!(\n target: \"miroir.request\",\n pod_id = %pod_id,\n request_id = %request_id,\n message = %message,\n duration_ms = duration.as_millis() as u64,\n status = status_u16,\n method = %method,\n path_template = %path_template,\n );\n }\n\n // Ensure request ID is in response headers\n let mut response = response;\n if !response.headers().contains_key(\"x-request-id\") {\n if let Ok(val) = HeaderValue::from_str(&request_id) {\n response.headers_mut().insert(\"x-request-id\", val);\n }\n }\n\n response\n}\n\n/// Create the metrics router for the :9090 server.\npub fn metrics_router() -> Router {\n Router::new().route(\"/metrics\", get(metrics_handler))\n}\n\n/// Handler that returns Prometheus metrics in text exposition format.\nasync fn metrics_handler(State(metrics): State) -> String {\n match metrics.encode_metrics() {\n Ok(metrics) => metrics,\n Err(e) => {\n tracing::error!(error = %e, \"failed to encode metrics\");\n format!(\"# ERROR: failed to encode metrics: {}\\n\", e)\n }\n }\n}\n\n/// Accessor methods for metrics that can be used by other parts of the application.\nimpl Metrics {\n // ── Scatter-gather ──\n\n pub fn record_scatter_fan_out(&self, size: u64) {\n self.scatter_fan_out_size.observe(size as f64);\n }\n\n pub fn inc_scatter_partial_responses(&self) {\n self.scatter_partial_responses.inc();\n }\n\n pub fn inc_scatter_retries(&self) {\n self.scatter_retries.inc();\n }\n\n // ── Node health ──\n\n pub fn set_node_healthy(&self, node_id: &str, healthy: bool) {\n self.node_healthy.with_label_values(&[node_id]).set(if healthy { 1.0 } else { 0.0 });\n }\n\n pub fn record_node_request_duration(&self, node_id: &str, operation: &str, duration_secs: f64) {\n self.node_request_duration.with_label_values(&[node_id, operation]).observe(duration_secs);\n }\n\n pub fn inc_node_errors(&self, node_id: &str, error_type: &str) {\n self.node_errors.with_label_values(&[node_id, error_type]).inc();\n }\n\n // ── Shards ──\n\n pub fn set_shard_coverage(&self, coverage: f64) {\n self.shard_coverage.set(coverage);\n }\n\n pub fn set_degraded_shards(&self, count: f64) {\n self.degraded_shards.set(count);\n }\n\n pub fn set_shard_distribution(&self, node_id: &str, count: f64) {\n self.shard_distribution.with_label_values(&[node_id]).set(count);\n }\n\n // ── Tasks ──\n\n pub fn observe_task_processing_age(&self, age_secs: f64) {\n self.task_processing_age.observe(age_secs);\n }\n\n pub fn inc_tasks_total(&self, status: &str) {\n self.tasks_total.with_label_values(&[status]).inc();\n }\n\n pub fn set_task_registry_size(&self, size: f64) {\n self.task_registry_size.set(size);\n }\n\n // ── Rebalancer ──\n\n pub fn set_rebalance_in_progress(&self, v: bool) {\n self.rebalance_in_progress.set(if v { 1.0 } else { 0.0 });\n }\n\n pub fn inc_rebalance_documents_migrated(&self, count: u64) {\n self.rebalance_documents_migrated.inc_by(count as f64);\n }\n\n pub fn observe_rebalance_duration(&self, secs: f64) {\n self.rebalance_duration.observe(secs);\n }\n\n // ── §13.11 Multi-search ──\n\n pub fn observe_multisearch_queries_per_batch(&self, count: u64) {\n if let Some(ref m) = self.multisearch_queries_per_batch {\n m.observe(count as f64);\n }\n }\n\n pub fn inc_multisearch_batches_total(&self) {\n if let Some(ref m) = self.multisearch_batches_total {\n m.inc();\n }\n }\n\n pub fn inc_multisearch_partial_failures(&self) {\n if let Some(ref m) = self.multisearch_partial_failures_total {\n m.inc();\n }\n }\n\n pub fn inc_multisearch_tenant_session_pin_override(&self, tenant: &str) {\n if let Some(ref m) = self.multisearch_tenant_session_pin_override_total {\n m.with_label_values(&[tenant]).inc();\n }\n }\n\n // ── §13.12 Vector search ──\n\n pub fn inc_vector_search_over_fetched(&self) {\n if let Some(ref m) = self.vector_search_over_fetched_total {\n m.inc();\n }\n }\n\n pub fn inc_vector_merge_strategy(&self, strategy: &str) {\n if let Some(ref m) = self.vector_merge_strategy {\n m.with_label_values(&[strategy]).inc();\n }\n }\n\n pub fn inc_vector_embedder_drift(&self) {\n if let Some(ref m) = self.vector_embedder_drift_total {\n m.inc();\n }\n }\n\n // ── §13.13 CDC ──\n\n pub fn inc_cdc_events_published(&self, sink: &str, index: &str) {\n if let Some(ref m) = self.cdc_events_published_total {\n m.with_label_values(&[sink, index]).inc();\n }\n }\n\n pub fn set_cdc_lag_seconds(&self, sink: &str, lag: f64) {\n if let Some(ref m) = self.cdc_lag_seconds {\n m.with_label_values(&[sink]).set(lag);\n }\n }\n\n pub fn set_cdc_buffer_bytes(&self, sink: &str, bytes: f64) {\n if let Some(ref m) = self.cdc_buffer_bytes {\n m.with_label_values(&[sink]).set(bytes);\n }\n }\n\n pub fn inc_cdc_dropped(&self, sink: &str) {\n if let Some(ref m) = self.cdc_dropped_total {\n m.with_label_values(&[sink]).inc();\n }\n }\n\n pub fn inc_cdc_events_suppressed(&self, origin: &str) {\n if let Some(ref m) = self.cdc_events_suppressed_total {\n m.with_label_values(&[origin]).inc();\n }\n }\n\n // ── §13.14 TTL ──\n\n pub fn inc_ttl_documents_expired(&self, index: &str) {\n if let Some(ref m) = self.ttl_documents_expired_total {\n m.with_label_values(&[index]).inc();\n }\n }\n\n pub fn observe_ttl_sweep_duration(&self, index: &str, secs: f64) {\n if let Some(ref m) = self.ttl_sweep_duration_seconds {\n m.with_label_values(&[index]).observe(secs);\n }\n }\n\n pub fn set_ttl_pending_estimate(&self, index: &str, count: f64) {\n if let Some(ref m) = self.ttl_pending_estimate {\n m.with_label_values(&[index]).set(count);\n }\n }\n\n // ── §13.15 Tenant affinity ──\n\n pub fn inc_tenant_queries(&self, tenant: &str, group: &str) {\n if let Some(ref m) = self.tenant_queries_total {\n m.with_label_values(&[tenant, group]).inc();\n }\n }\n\n pub fn set_tenant_pinned_groups(&self, tenant: &str, group: u32) {\n if let Some(ref m) = self.tenant_pinned_groups {\n m.with_label_values(&[tenant]).set(group as f64);\n }\n }\n\n pub fn inc_tenant_fallback(&self, reason: &str) {\n if let Some(ref m) = self.tenant_fallback_total {\n m.with_label_values(&[reason]).inc();\n }\n }\n\n // ── §13.16 Shadow ──\n\n pub fn inc_shadow_diff(&self, kind: &str) {\n if let Some(ref m) = self.shadow_diff_total {\n m.with_label_values(&[kind]).inc();\n }\n }\n\n pub fn set_shadow_kendall_tau(&self, tau: f64) {\n if let Some(ref m) = self.shadow_kendall_tau {\n m.set(tau);\n }\n }\n\n pub fn observe_shadow_latency_delta(&self, delta: f64) {\n if let Some(ref m) = self.shadow_latency_delta_seconds {\n m.observe(delta);\n }\n }\n\n pub fn inc_shadow_errors(&self, target: &str, side: &str) {\n if let Some(ref m) = self.shadow_errors_total {\n m.with_label_values(&[target, side]).inc();\n }\n }\n\n // ── §13.17 ILM ──\n\n pub fn inc_rollover_events(&self, policy: &str) {\n if let Some(ref m) = self.rollover_events_total {\n m.with_label_values(&[policy]).inc();\n }\n }\n\n pub fn set_rollover_active_indexes(&self, alias: &str, count: f64) {\n if let Some(ref m) = self.rollover_active_indexes {\n m.with_label_values(&[alias]).set(count);\n }\n }\n\n pub fn inc_rollover_documents_expired(&self, policy: &str) {\n if let Some(ref m) = self.rollover_documents_expired_total {\n m.with_label_values(&[policy]).inc();\n }\n }\n\n pub fn set_rollover_last_action_seconds(&self, policy: &str, secs: f64) {\n if let Some(ref m) = self.rollover_last_action_seconds {\n m.with_label_values(&[policy]).set(secs);\n }\n }\n\n // ── §13.18 Canary ──\n\n pub fn inc_canary_runs(&self, canary: &str, result: &str) {\n if let Some(ref m) = self.canary_runs_total {\n m.with_label_values(&[canary, result]).inc();\n }\n }\n\n pub fn observe_canary_latency_ms(&self, canary: &str, ms: f64) {\n if let Some(ref m) = self.canary_latency_ms {\n m.with_label_values(&[canary]).observe(ms);\n }\n }\n\n pub fn inc_canary_assertion_failures(&self, canary: &str, assertion_type: &str) {\n if let Some(ref m) = self.canary_assertion_failures_total {\n m.with_label_values(&[canary, assertion_type]).inc();\n }\n }\n\n // ── §13.19 Admin UI ──\n\n pub fn inc_admin_ui_sessions(&self) {\n if let Some(ref m) = self.admin_ui_sessions_total {\n m.inc();\n }\n }\n\n pub fn inc_admin_ui_action(&self, action: &str) {\n if let Some(ref m) = self.admin_ui_action_total {\n m.with_label_values(&[action]).inc();\n }\n }\n\n pub fn inc_admin_ui_destructive_action(&self, action: &str) {\n if let Some(ref m) = self.admin_ui_destructive_action_total {\n m.with_label_values(&[action]).inc();\n }\n }\n\n // ── §13.20 Explain ──\n\n pub fn inc_explain_requests(&self) {\n if let Some(ref m) = self.explain_requests_total {\n m.inc();\n }\n }\n\n pub fn inc_explain_warnings(&self, warning_type: &str) {\n if let Some(ref m) = self.explain_warnings_total {\n m.with_label_values(&[warning_type]).inc();\n }\n }\n\n pub fn inc_explain_execute(&self) {\n if let Some(ref m) = self.explain_execute_total {\n m.inc();\n }\n }\n\n // ── §13.21 Search UI ──\n\n pub fn inc_search_ui_sessions(&self) {\n if let Some(ref m) = self.search_ui_sessions_total {\n m.inc();\n }\n }\n\n pub fn inc_search_ui_queries(&self, index: &str) {\n if let Some(ref m) = self.search_ui_queries_total {\n m.with_label_values(&[index]).inc();\n }\n }\n\n pub fn inc_search_ui_zero_hits(&self, index: &str) {\n if let Some(ref m) = self.search_ui_zero_hits_total {\n m.with_label_values(&[index]).inc();\n }\n }\n\n pub fn inc_search_ui_click_through(&self, index: &str) {\n if let Some(ref m) = self.search_ui_click_through_total {\n m.with_label_values(&[index]).inc();\n }\n }\n\n pub fn set_search_ui_p95_ms(&self, index: &str, ms: f64) {\n if let Some(ref m) = self.search_ui_p95_ms {\n m.with_label_values(&[index]).set(ms);\n }\n }\n\n // ── §14.9 Resource-pressure ──\n\n pub fn set_memory_pressure(&self, level: u32) {\n self.memory_pressure.set(level as f64);\n }\n\n pub fn inc_cpu_throttled_seconds(&self, secs: f64) {\n self.cpu_throttled_seconds_total.inc_by(secs);\n }\n\n pub fn set_request_queue_depth(&self, depth: u64) {\n self.request_queue_depth.set(depth as f64);\n }\n\n pub fn set_background_queue_depth(&self, job_type: &str, depth: u64) {\n self.background_queue_depth.with_label_values(&[job_type]).set(depth as f64);\n }\n\n pub fn set_peer_pod_count(&self, count: u64) {\n self.peer_pod_count.set(count as f64);\n }\n\n pub fn set_leader(&self, is_leader: bool) {\n self.leader.set(if is_leader { 1.0 } else { 0.0 });\n }\n\n pub fn set_owned_shards_count(&self, count: u64) {\n self.owned_shards_count.set(count as f64);\n }\n\n // ── §13.5 Two-phase settings broadcast metrics ──\n\n pub fn set_settings_broadcast_phase(&self, index: &str, phase: u8) {\n self.settings_broadcast_phase.with_label_values(&[index]).set(phase as f64);\n }\n\n pub fn clear_settings_broadcast_phase(&self, index: &str) {\n self.settings_broadcast_phase.with_label_values(&[index]).set(0.0);\n }\n\n pub fn inc_settings_hash_mismatch(&self) {\n self.settings_hash_mismatch_total.inc();\n }\n\n pub fn inc_settings_drift_repair(&self, index: &str) {\n self.settings_drift_repair_total.with_label_values(&[index]).inc();\n }\n\n pub fn set_settings_version(&self, index: &str, version: u64) {\n self.settings_version.with_label_values(&[index]).set(version as f64);\n }\n\n pub fn get_settings_version(&self, index: &str) -> f64 {\n self.settings_version.with_label_values(&[index]).get()\n }\n\n // ── §13.7 Alias metrics ──\n\n pub fn inc_alias_resolution(&self, alias: &str) {\n self.alias_resolutions_total.with_label_values(&[alias]).inc();\n }\n\n pub fn inc_alias_flip(&self, alias: &str) {\n self.alias_flips_total.with_label_values(&[alias]).inc();\n }\n\n // ── §13.6 Session pinning metrics ──\n\n pub fn set_session_active_count(&self, count: u64) {\n self.session_active_count.set(count as f64);\n }\n\n pub fn inc_session_pin_enforced(&self, strategy: &str) {\n self.session_pin_enforced_total.with_label_values(&[strategy]).inc();\n }\n\n pub fn observe_session_wait_duration(&self, duration_seconds: f64) {\n self.session_wait_duration_seconds.observe(duration_seconds);\n }\n\n pub fn inc_session_wait_timeout(&self, strategy: &str) {\n self.session_wait_timeout_total.with_label_values(&[strategy]).inc();\n }\n\n pub fn registry(&self) -> &Registry {\n &self.registry\n }\n}\n\n#[cfg(test)]\nmod tests {\n use super::*;\n\n #[test]\n fn test_request_id_generation() {\n // Generate multiple IDs to verify format\n for _ in 0..10 {\n let id = generate_request_id();\n\n // IDs should be 16 hex chars (64-bit hash)\n assert_eq!(id.len(), 16);\n\n // IDs should be hexadecimal\n assert!(id.chars().all(|c| c.is_ascii_hexdigit()));\n }\n\n // Test that different UUID prefixes produce different IDs\n let id1 = generate_request_id();\n std::thread::sleep(std::time::Duration::from_millis(5));\n let id2 = generate_request_id();\n // In production, time ensures uniqueness; test just verifies format above\n assert_eq!(id1.len(), 16);\n assert_eq!(id2.len(), 16);\n }\n\n #[test]\n fn test_metrics_creation() {\n // Default config has all §13 features enabled\n let metrics = Metrics::new(&MiroirConfig::default());\n\n // Add some sample data to ensure metrics show up in output\n metrics.request_duration.with_label_values(&[\"GET\", \"/test\", \"200\"]).observe(0.1);\n metrics.requests_total.with_label_values(&[\"GET\", \"/test\", \"200\"]).inc();\n metrics.requests_in_flight.inc();\n metrics.node_healthy.with_label_values(&[\"test-node\"]).set(1.0);\n metrics.node_request_duration.with_label_values(&[\"test-node\", \"search\"]).observe(0.05);\n metrics.node_errors.with_label_values(&[\"test-node\", \"timeout\"]).inc();\n metrics.shard_coverage.set(1.0);\n metrics.degraded_shards.set(0.0);\n metrics.shard_distribution.with_label_values(&[\"test-node\"]).set(32.0);\n metrics.task_processing_age.observe(0.1);\n metrics.tasks_total.with_label_values(&[\"completed\"]).inc();\n metrics.task_registry_size.set(5.0);\n metrics.scatter_fan_out_size.observe(3.0);\n metrics.scatter_partial_responses.inc();\n metrics.scatter_retries.inc();\n metrics.rebalance_in_progress.set(0.0);\n metrics.rebalance_documents_migrated.inc();\n metrics.rebalance_duration.observe(10.0);\n\n // Write to advanced Vec metrics so they appear in output\n metrics.inc_multisearch_tenant_session_pin_override(\"t1\");\n metrics.inc_vector_merge_strategy(\"convex\");\n metrics.inc_cdc_events_published(\"webhook\", \"idx1\");\n metrics.set_cdc_lag_seconds(\"webhook\", 0.5);\n metrics.set_cdc_buffer_bytes(\"webhook\", 1024.0);\n metrics.inc_cdc_dropped(\"webhook\");\n metrics.inc_cdc_events_suppressed(\"origin1\");\n metrics.inc_ttl_documents_expired(\"idx1\");\n metrics.observe_ttl_sweep_duration(\"idx1\", 0.1);\n metrics.set_ttl_pending_estimate(\"idx1\", 50.0);\n metrics.inc_tenant_queries(\"t1\", \"g1\");\n metrics.set_tenant_pinned_groups(\"t1\", 1);\n metrics.inc_tenant_fallback(\"no_group\");\n metrics.inc_shadow_diff(\"rank\");\n metrics.inc_shadow_errors(\"target1\", \"primary\");\n metrics.inc_rollover_events(\"policy1\");\n metrics.set_rollover_active_indexes(\"alias1\", 1.0);\n metrics.inc_rollover_documents_expired(\"policy1\");\n metrics.set_rollover_last_action_seconds(\"policy1\", 60.0);\n metrics.inc_canary_runs(\"canary1\", \"pass\");\n metrics.observe_canary_latency_ms(\"canary1\", 50.0);\n metrics.inc_canary_assertion_failures(\"canary1\", \"latency\");\n metrics.inc_admin_ui_action(\"login\");\n metrics.inc_admin_ui_destructive_action(\"delete_index\");\n metrics.inc_explain_warnings(\"slow_plan\");\n metrics.inc_search_ui_queries(\"idx1\");\n metrics.inc_search_ui_zero_hits(\"idx1\");\n metrics.inc_search_ui_click_through(\"idx1\");\n metrics.set_search_ui_p95_ms(\"idx1\", 150.0);\n\n // §14.9 Resource-pressure metrics\n metrics.set_memory_pressure(0);\n metrics.inc_cpu_throttled_seconds(1.5);\n metrics.set_request_queue_depth(42);\n metrics.set_background_queue_depth(\"rebalance\", 5);\n metrics.set_background_queue_depth(\"replication\", 3);\n metrics.set_peer_pod_count(3);\n metrics.set_leader(true);\n metrics.set_owned_shards_count(12);\n\n let encoded = metrics.encode_metrics();\n assert!(encoded.is_ok());\n\n let output = encoded.unwrap();\n\n // Verify all 18 core plan §10 metric names appear in the output\n let expected_metrics = [\n // Request metrics\n \"miroir_request_duration_seconds\",\n \"miroir_requests_total\",\n \"miroir_requests_in_flight\",\n // Node health metrics\n \"miroir_node_healthy\",\n \"miroir_node_request_duration_seconds\",\n \"miroir_node_errors_total\",\n // Shard metrics\n \"miroir_shard_coverage\",\n \"miroir_degraded_shards_total\",\n \"miroir_shard_distribution\",\n // Task metrics\n \"miroir_task_processing_age_seconds\",\n \"miroir_tasks_total\",\n \"miroir_task_registry_size\",\n // Scatter-gather metrics\n \"miroir_scatter_fan_out_size\",\n \"miroir_scatter_partial_responses_total\",\n \"miroir_scatter_retries_total\",\n // Rebalancer metrics\n \"miroir_rebalance_in_progress\",\n \"miroir_rebalance_documents_migrated_total\",\n \"miroir_rebalance_duration_seconds\",\n ];\n for name in &expected_metrics {\n assert!(output.contains(name), \"missing metric: {}\", name);\n }\n\n // With defaults (all §13 enabled), advanced metrics should be present\n let advanced_metrics = [\n // §13.11 Multi-search\n \"miroir_multisearch_queries_per_batch\",\n \"miroir_multisearch_batches_total\",\n \"miroir_multisearch_partial_failures_total\",\n \"miroir_tenant_session_pin_override_total\",\n // §13.12 Vector\n \"miroir_vector_search_over_fetched_total\",\n \"miroir_vector_merge_strategy\",\n \"miroir_vector_embedder_drift_total\",\n // §13.13 CDC\n \"miroir_cdc_events_published_total\",\n \"miroir_cdc_lag_seconds\",\n \"miroir_cdc_buffer_bytes\",\n \"miroir_cdc_dropped_total\",\n \"miroir_cdc_events_suppressed_total\",\n // §13.14 TTL\n \"miroir_ttl_documents_expired_total\",\n \"miroir_ttl_sweep_duration_seconds\",\n \"miroir_ttl_pending_estimate\",\n // §13.15 Tenant\n \"miroir_tenant_queries_total\",\n \"miroir_tenant_pinned_groups\",\n \"miroir_tenant_fallback_total\",\n // §13.16 Shadow\n \"miroir_shadow_diff_total\",\n \"miroir_shadow_kendall_tau\",\n \"miroir_shadow_latency_delta_seconds\",\n \"miroir_shadow_errors_total\",\n // §13.17 ILM\n \"miroir_rollover_events_total\",\n \"miroir_rollover_active_indexes\",\n \"miroir_rollover_documents_expired_total\",\n \"miroir_rollover_last_action_seconds\",\n // §13.18 Canary\n \"miroir_canary_runs_total\",\n \"miroir_canary_latency_ms\",\n \"miroir_canary_assertion_failures_total\",\n // §13.19 Admin UI\n \"miroir_admin_ui_sessions_total\",\n \"miroir_admin_ui_action_total\",\n \"miroir_admin_ui_destructive_action_total\",\n // §13.20 Explain\n \"miroir_explain_requests_total\",\n \"miroir_explain_warnings_total\",\n \"miroir_explain_execute_total\",\n // §13.21 Search UI\n \"miroir_search_ui_sessions_total\",\n \"miroir_search_ui_queries_total\",\n \"miroir_search_ui_zero_hits_total\",\n \"miroir_search_ui_click_through_total\",\n \"miroir_search_ui_p95_ms\",\n ];\n for name in &advanced_metrics {\n assert!(output.contains(name), \"missing advanced metric: {}\", name);\n }\n }\n\n #[test]\n fn test_metrics_feature_flags_off() {\n // Build a config with all §13.11-13.21 features disabled\n let mut config = MiroirConfig::default();\n config.multi_search.enabled = false;\n config.vector_search.enabled = false;\n config.cdc.enabled = false;\n config.ttl.enabled = false;\n config.tenant_affinity.enabled = false;\n config.shadow.enabled = false;\n config.ilm.enabled = false;\n config.canary_runner.enabled = false;\n config.admin_ui.enabled = false;\n config.explain.enabled = false;\n config.search_ui.enabled = false;\n\n let metrics = Metrics::new(&config);\n\n // Write to core Vec metrics so they appear in output\n metrics.request_duration.with_label_values(&[\"GET\", \"/test\", \"200\"]).observe(0.1);\n\n let encoded = metrics.encode_metrics().unwrap();\n\n // Core metrics should still be present\n assert!(encoded.contains(\"miroir_request_duration_seconds\"));\n assert!(encoded.contains(\"miroir_rebalance_duration_seconds\"));\n\n // Advanced metrics should NOT appear\n let advanced_names = [\n \"miroir_multisearch_queries_per_batch\",\n \"miroir_vector_search_over_fetched_total\",\n \"miroir_cdc_events_published_total\",\n \"miroir_ttl_documents_expired_total\",\n \"miroir_tenant_queries_total\",\n \"miroir_shadow_diff_total\",\n \"miroir_rollover_events_total\",\n \"miroir_canary_runs_total\",\n \"miroir_admin_ui_sessions_total\",\n \"miroir_explain_requests_total\",\n \"miroir_search_ui_sessions_total\",\n ];\n for name in &advanced_names {\n assert!(!encoded.contains(name), \"advanced metric should not appear when disabled: {}\", name);\n }\n }\n\n #[test]\n fn test_feature_gated_accessors_noop_when_disabled() {\n let mut config = MiroirConfig::default();\n config.multi_search.enabled = false;\n config.vector_search.enabled = false;\n config.cdc.enabled = false;\n config.ttl.enabled = false;\n config.tenant_affinity.enabled = false;\n config.shadow.enabled = false;\n config.ilm.enabled = false;\n config.canary_runner.enabled = false;\n config.admin_ui.enabled = false;\n config.explain.enabled = false;\n config.search_ui.enabled = false;\n\n let metrics = Metrics::new(&config);\n\n // All accessor methods should be safe to call (no-op)\n metrics.observe_multisearch_queries_per_batch(5);\n metrics.inc_multisearch_batches_total();\n metrics.inc_multisearch_partial_failures();\n metrics.inc_multisearch_tenant_session_pin_override(\"t1\");\n metrics.inc_vector_search_over_fetched();\n metrics.inc_vector_merge_strategy(\"convex\");\n metrics.inc_vector_embedder_drift();\n metrics.inc_cdc_events_published(\"webhook\", \"idx\");\n metrics.set_cdc_lag_seconds(\"webhook\", 1.5);\n metrics.set_cdc_buffer_bytes(\"webhook\", 1024.0);\n metrics.inc_cdc_dropped(\"webhook\");\n metrics.inc_cdc_events_suppressed(\"origin1\");\n metrics.inc_ttl_documents_expired(\"idx\");\n metrics.observe_ttl_sweep_duration(\"idx\", 0.1);\n metrics.set_ttl_pending_estimate(\"idx\", 50.0);\n metrics.inc_tenant_queries(\"t1\", \"0\");\n metrics.set_tenant_pinned_groups(\"t1\", 1);\n metrics.inc_tenant_fallback(\"no_group\");\n metrics.inc_shadow_diff(\"rank\");\n metrics.set_shadow_kendall_tau(0.95);\n metrics.observe_shadow_latency_delta(0.01);\n metrics.inc_shadow_errors(\"target1\", \"primary\");\n metrics.inc_rollover_events(\"policy1\");\n metrics.set_rollover_active_indexes(\"alias1\", 1.0);\n metrics.inc_rollover_documents_expired(\"policy1\");\n metrics.set_rollover_last_action_seconds(\"policy1\", 60.0);\n metrics.inc_canary_runs(\"canary1\", \"pass\");\n metrics.observe_canary_latency_ms(\"canary1\", 50.0);\n metrics.inc_canary_assertion_failures(\"canary1\", \"latency\");\n metrics.inc_admin_ui_sessions();\n metrics.inc_admin_ui_action(\"login\");\n metrics.inc_admin_ui_destructive_action(\"delete_index\");\n metrics.inc_explain_requests();\n metrics.inc_explain_warnings(\"slow_plan\");\n metrics.inc_explain_execute();\n metrics.inc_search_ui_sessions();\n metrics.inc_search_ui_queries(\"idx\");\n metrics.inc_search_ui_zero_hits(\"idx\");\n metrics.inc_search_ui_click_through(\"idx\");\n metrics.set_search_ui_p95_ms(\"idx\", 150.0);\n }\n\n #[test]\n fn test_header_request_id() {\n let mut headers = HeaderMap::new();\n assert!(headers.get_request_id().is_none());\n\n headers.set_request_id(\"test-id-123\");\n assert_eq!(headers.get_request_id(), Some(\"test-id-123\".to_string()));\n }\n\n // ---------------------------------------------------------------------------\n // RequestId type tests\n // ---------------------------------------------------------------------------\n\n #[test]\n fn test_request_id_format() {\n let id = RequestId::new();\n // RequestId should be exactly 8 hex characters\n assert_eq!(id.as_str().len(), 8);\n assert!(id.as_str().chars().all(|c| c.is_ascii_hexdigit()));\n }\n\n #[test]\n fn test_request_id_parse_valid() {\n // Valid 8-char hex string\n let valid = \"abcd1234\";\n let parsed = RequestId::parse(valid.to_string());\n assert!(parsed.is_some());\n assert_eq!(parsed.unwrap().as_str(), valid);\n }\n\n #[test]\n fn test_request_id_parse_invalid_wrong_length() {\n // Wrong length (too short)\n assert!(RequestId::parse(\"abc123\".to_string()).is_none());\n // Wrong length (too long)\n assert!(RequestId::parse(\"abcd12345678\".to_string()).is_none());\n }\n\n #[test]\n fn test_request_id_parse_invalid_non_hex() {\n // Contains non-hex characters\n assert!(RequestId::parse(\"abcd1234!\".to_string()).is_none());\n assert!(RequestId::parse(\"ghijklmn\".to_string()).is_none());\n }\n\n #[test]\n fn test_request_id_uniqueness() {\n // Generate two consecutive IDs - they should be different\n // due to UUIDv7's timestamp component\n let id1 = RequestId::new();\n std::thread::sleep(std::time::Duration::from_millis(5));\n let id2 = RequestId::new();\n\n assert_ne!(id1, id2);\n assert_ne!(id1.as_str(), id2.as_str());\n }\n\n // ---------------------------------------------------------------------------\n // Integration tests for request_id_middleware\n // ---------------------------------------------------------------------------\n\n #[tokio::test]\n async fn test_request_id_middleware_adds_header() {\n use axum::{routing::get, Router};\n use http_body_util::Full;\n use tower::ServiceExt;\n\n // Build a simple router with the request ID middleware\n let app = Router::new()\n .route(\"/test\", get(|| async { \"OK\" }))\n .layer(axum::middleware::from_fn(request_id_middleware));\n\n // Create a test request\n let request = Request::builder()\n .uri(\"/test\")\n .body(Full::default())\n .unwrap();\n\n // Send the request\n let response = app.oneshot(request).await.unwrap();\n\n // Verify X-Request-Id header is present\n let header = response\n .headers()\n .get(\"x-request-id\")\n .expect(\"X-Request-Id header should be present\");\n let header_value = header.to_str().unwrap();\n\n // Verify it's 8 hex characters\n assert_eq!(\n header_value.len(),\n 8,\n \"X-Request-Id should be 8 characters\"\n );\n assert!(\n header_value.chars().all(|c| c.is_ascii_hexdigit()),\n \"X-Request-Id should be hexadecimal\"\n );\n }\n\n #[tokio::test]\n async fn test_request_id_middleware_unique_per_request() {\n use axum::{routing::get, Router};\n use http_body_util::Full;\n use tower::ServiceExt;\n\n // Build a simple router with the request ID middleware\n let app = Router::new()\n .route(\"/test\", get(|| async { \"OK\" }))\n .layer(axum::middleware::from_fn(request_id_middleware));\n\n // Create two identical requests\n let request1 = Request::builder()\n .uri(\"/test\")\n .body(Full::default())\n .unwrap();\n\n let request2 = Request::builder()\n .uri(\"/test\")\n .body(Full::default())\n .unwrap();\n\n // Send both requests\n let response1 = app.clone().oneshot(request1).await.unwrap();\n let response2 = app.oneshot(request2).await.unwrap();\n\n // Extract headers\n let id1 = response1\n .headers()\n .get(\"x-request-id\")\n .unwrap()\n .to_str()\n .unwrap();\n let id2 = response2\n .headers()\n .get(\"x-request-id\")\n .unwrap()\n .to_str()\n .unwrap();\n\n // Verify IDs are different (UUIDv7 timestamp ensures this)\n assert_ne!(\n id1, id2,\n \"Two consecutive requests should have different request IDs\"\n );\n\n // Both should still be valid 8-char hex\n assert_eq!(id1.len(), 8);\n assert_eq!(id2.len(), 8);\n }\n\n #[tokio::test]\n async fn test_request_id_middleware_preserves_existing_header() {\n use axum::{routing::get, Router};\n use http_body_util::Full;\n use tower::ServiceExt;\n\n // Build a simple router with the request ID middleware\n let app = Router::new()\n .route(\"/test\", get(|| async { \"OK\" }))\n .layer(axum::middleware::from_fn(request_id_middleware));\n\n // Create a request with a pre-existing X-Request-Id header\n let existing_id = \"deadbeef\";\n let request = Request::builder()\n .uri(\"/test\")\n .header(\"x-request-id\", existing_id)\n .body(Full::default())\n .unwrap();\n\n // Send the request\n let response = app.oneshot(request).await.unwrap();\n\n // Verify the header is preserved\n let header = response\n .headers()\n .get(\"x-request-id\")\n .expect(\"X-Request-Id header should be present\");\n let header_value = header.to_str().unwrap();\n\n assert_eq!(\n header_value, existing_id,\n \"Existing X-Request-Id should be preserved\"\n );\n }\n}\n","numLines":2122,"startLine":1,"totalLines":2122}}} +{"type":"system","subtype":"status","status":"requesting","uuid":"fba93238-a28d-4067-b33e-f5b65dba43ca","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379"} +{"type":"stream_event","event":{"type":"message_start","message":{"id":"msg_20260523142402e35f124078714058","type":"message","role":"assistant","model":"glm-4.7","content":[],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0}}},"session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","parent_tool_use_id":null,"uuid":"bfa5cde6-3283-4cee-9c40-edfefce89cf2","ttft_ms":2298} 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P7.1 Core metrics families acceptance tests.\n2\t//!\n3\t//! Verifies that all plan §10 core metrics are properly registered and accessible.\n4\t\n5\tuse miroir_proxy::middleware::Metrics;\n6\tuse miroir_core::config::MiroirConfig;\n7\t\n8\t#[test]\n9\tfn test_all_core_metrics_registered() {\n10\t let config = MiroirConfig::default();\n11\t let metrics = Metrics::new(&config);\n12\t\n13\t // Add sample data to ensure metrics appear in output\n14\t // Request metrics - use telemetry middleware to record these\n15\t // (we can't directly access the private fields)\n16\t metrics.requests_in_flight().inc();\n17\t metrics.requests_in_flight().dec();\n18\t\n19\t // Node metrics\n20\t metrics.set_node_healthy(\"node-1\", true);\n21\t metrics.record_node_request_duration(\"node-1\", \"search\", 0.05);\n22\t metrics.inc_node_errors(\"node-1\", \"timeout\");\n23\t\n24\t // Shard metrics - use f64 for values\n25\t metrics.set_shard_coverage(1.0);\n26\t metrics.set_degraded_shards(0.0);\n27\t metrics.set_shard_distribution(\"node-1\", 32.0);\n28\t\n29\t // Task metrics\n30\t metrics.observe_task_processing_age(0.1);\n31\t metrics.inc_tasks_total(\"completed\");\n32\t metrics.set_task_registry_size(5.0);\n33\t\n34\t // Scatter-gather metrics\n35\t metrics.record_scatter_fan_out(3);\n36\t metrics.inc_scatter_partial_responses();\n37\t metrics.inc_scatter_retries();\n38\t\n39\t // Rebalancer metrics\n40\t metrics.set_rebalance_in_progress(false);\n41\t metrics.inc_rebalance_documents_migrated(100);\n42\t metrics.observe_rebalance_duration(10.0);\n43\t\n44\t let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n45\t let output = encoded.as_str();\n46\t\n47\t // Verify all 18 core plan §10 metric names appear in the output\n48\t let expected_metrics = [\n49\t // Request metrics (3)\n50\t \"miroir_request_duration_seconds\",\n51\t \"miroir_requests_total\",\n52\t \"miroir_requests_in_flight\",\n53\t // Node health metrics (3)\n54\t \"miroir_node_healthy\",\n55\t \"miroir_node_request_duration_seconds\",\n56\t \"miroir_node_errors_total\",\n57\t // Shard metrics (3)\n58\t \"miroir_shard_coverage\",\n59\t \"miroir_degraded_shards_total\",\n60\t \"miroir_shard_distribution\",\n61\t // Task metrics (3)\n62\t \"miroir_task_processing_age_seconds\",\n63\t \"miroir_tasks_total\",\n64\t \"miroir_task_registry_size\",\n65\t // Scatter-gather metrics (3)\n66\t \"miroir_scatter_fan_out_size\",\n67\t \"miroir_scatter_partial_responses_total\",\n68\t \"miroir_scatter_retries_total\",\n69\t // Rebalancer metrics (3)\n70\t \"miroir_rebalance_in_progress\",\n71\t \"miroir_rebalance_documents_migrated_total\",\n72\t \"miroir_rebalance_duration_seconds\",\n73\t ];\n74\t\n75\t for name in &expected_metrics {\n76\t assert!(\n77\t output.contains(name),\n78\t \"missing core metric: {}\",\n79\t name\n80\t );\n81\t }\n82\t}\n83\t\n84\t#[test]\n85\tfn test_scatter_fan_out_metric_records_correctly() {\n86\t let config = MiroirConfig::default();\n87\t let metrics = Metrics::new(&config);\n88\t\n89\t // Record a scatter operation that hit 3 nodes\n90\t metrics.record_scatter_fan_out(3);\n91\t\n92\t let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n93\t let output = encoded.as_str();\n94\t\n95\t // Verify the metric is present\n96\t assert!(\n97\t output.contains(\"miroir_scatter_fan_out_size\"),\n98\t \"miroir_scatter_fan_out_size metric not found\"\n99\t );\n100\t\n101\t // Verify the sample value is recorded (histogram buckets should show a sample at 3.0)\n102\t // Note: Prometheus histogram buckets use le=\"3.0\" format, not le=\"3\"\n103\t assert!(\n104\t output.contains(\"miroir_scatter_fan_out_size_bucket{le=\\\"3.0\\\"} 1\"),\n105\t \"Expected histogram sample at bucket 3.0 not found. Output:\\n{}\",\n106\t output\n107\t );\n108\t}\n109\t\n110\t#[test]\n111\tfn test_node_health_metrics_have_correct_labels() {\n112\t let config = MiroirConfig::default();\n113\t let metrics = Metrics::new(&config);\n114\t\n115\t // Set node health for two nodes\n116\t metrics.set_node_healthy(\"node-1\", true);\n117\t metrics.set_node_healthy(\"node-2\", false);\n118\t\n119\t let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n120\t let output = encoded.as_str();\n121\t\n122\t // Verify node_id label is present and values are correct\n123\t assert!(\n124\t output.contains(\"miroir_node_healthy\") &&\n125\t output.contains(\"node-1\") &&\n126\t output.contains(\" 1\"),\n127\t \"Expected node-1 healthy metric not found. Output:\\n{}\",\n128\t output\n129\t );\n130\t assert!(\n131\t output.contains(\"miroir_node_healthy\") &&\n132\t output.contains(\"node-2\") &&\n133\t output.contains(\" 0\"),\n134\t \"Expected node-2 unhealthy metric not found. Output:\\n{}\",\n135\t output\n136\t );\n137\t}\n138\t\n139\t#[test]\n140\tfn test_node_request_duration_has_operation_label() {\n141\t let config = MiroirConfig::default();\n142\t let metrics = Metrics::new(&config);\n143\t\n144\t // Record a node request duration\n145\t metrics.record_node_request_duration(\"node-1\", \"search\", 0.05);\n146\t\n147\t let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n148\t let output = encoded.as_str();\n149\t\n150\t // Verify operation label is present (format may vary: \"node-1\",\"search\" or node_id=\"node-1\",operation=\"search\")\n151\t assert!(\n152\t output.contains(\"miroir_node_request_duration_seconds\") &&\n153\t output.contains(\"node-1\") &&\n154\t output.contains(\"search\"),\n155\t \"Expected node request duration metric with node_id and operation labels not found. Output:\\n{}\",\n156\t output\n157\t );\n158\t}\n159\t\n160\t#[test]\n161\tfn test_task_metrics_have_status_label() {\n162\t let config = MiroirConfig::default();\n163\t let metrics = Metrics::new(&config);\n164\t\n165\t // Increment task counters\n166\t metrics.inc_tasks_total(\"completed\");\n167\t metrics.inc_tasks_total(\"failed\");\n168\t\n169\t let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n170\t let output = encoded.as_str();\n171\t\n172\t // Verify status label is present\n173\t assert!(\n174\t output.contains(\"miroir_tasks_total\") &&\n175\t output.contains(\"completed\") &&\n176\t output.contains(\"failed\"),\n177\t \"Expected tasks_total metric with status labels not found. Output:\\n{}\",\n178\t output\n179\t );\n180\t}\n181\t"}]},"parent_tool_use_id":null,"session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"dd0f0d6a-d601-4824-af1a-882dbff4f0f1","timestamp":"2026-05-23T06:24:10.204Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/crates/miroir-proxy/tests/p7_1_core_metrics.rs","content":"//! P7.1 Core metrics families acceptance tests.\n//!\n//! Verifies that all plan §10 core metrics are properly registered and accessible.\n\nuse miroir_proxy::middleware::Metrics;\nuse miroir_core::config::MiroirConfig;\n\n#[test]\nfn test_all_core_metrics_registered() {\n let config = MiroirConfig::default();\n let metrics = Metrics::new(&config);\n\n // Add sample data to ensure metrics appear in output\n // Request metrics - use telemetry middleware to record these\n // (we can't directly access the private fields)\n metrics.requests_in_flight().inc();\n metrics.requests_in_flight().dec();\n\n // Node metrics\n metrics.set_node_healthy(\"node-1\", true);\n metrics.record_node_request_duration(\"node-1\", \"search\", 0.05);\n metrics.inc_node_errors(\"node-1\", \"timeout\");\n\n // Shard metrics - use f64 for values\n metrics.set_shard_coverage(1.0);\n metrics.set_degraded_shards(0.0);\n metrics.set_shard_distribution(\"node-1\", 32.0);\n\n // Task metrics\n metrics.observe_task_processing_age(0.1);\n metrics.inc_tasks_total(\"completed\");\n metrics.set_task_registry_size(5.0);\n\n // Scatter-gather metrics\n metrics.record_scatter_fan_out(3);\n metrics.inc_scatter_partial_responses();\n metrics.inc_scatter_retries();\n\n // Rebalancer metrics\n metrics.set_rebalance_in_progress(false);\n metrics.inc_rebalance_documents_migrated(100);\n metrics.observe_rebalance_duration(10.0);\n\n let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n let output = encoded.as_str();\n\n // Verify all 18 core plan §10 metric names appear in the output\n let expected_metrics = [\n // Request metrics (3)\n \"miroir_request_duration_seconds\",\n \"miroir_requests_total\",\n \"miroir_requests_in_flight\",\n // Node health metrics (3)\n \"miroir_node_healthy\",\n \"miroir_node_request_duration_seconds\",\n \"miroir_node_errors_total\",\n // Shard metrics (3)\n \"miroir_shard_coverage\",\n \"miroir_degraded_shards_total\",\n \"miroir_shard_distribution\",\n // Task metrics (3)\n \"miroir_task_processing_age_seconds\",\n \"miroir_tasks_total\",\n \"miroir_task_registry_size\",\n // Scatter-gather metrics (3)\n \"miroir_scatter_fan_out_size\",\n \"miroir_scatter_partial_responses_total\",\n \"miroir_scatter_retries_total\",\n // Rebalancer metrics (3)\n \"miroir_rebalance_in_progress\",\n \"miroir_rebalance_documents_migrated_total\",\n \"miroir_rebalance_duration_seconds\",\n ];\n\n for name in &expected_metrics {\n assert!(\n output.contains(name),\n \"missing core metric: {}\",\n name\n );\n }\n}\n\n#[test]\nfn test_scatter_fan_out_metric_records_correctly() {\n let config = MiroirConfig::default();\n let metrics = Metrics::new(&config);\n\n // Record a scatter operation that hit 3 nodes\n metrics.record_scatter_fan_out(3);\n\n let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n let output = encoded.as_str();\n\n // Verify the metric is present\n assert!(\n output.contains(\"miroir_scatter_fan_out_size\"),\n \"miroir_scatter_fan_out_size metric not found\"\n );\n\n // Verify the sample value is recorded (histogram buckets should show a sample at 3.0)\n // Note: Prometheus histogram buckets use le=\"3.0\" format, not le=\"3\"\n assert!(\n output.contains(\"miroir_scatter_fan_out_size_bucket{le=\\\"3.0\\\"} 1\"),\n \"Expected histogram sample at bucket 3.0 not found. Output:\\n{}\",\n output\n );\n}\n\n#[test]\nfn test_node_health_metrics_have_correct_labels() {\n let config = MiroirConfig::default();\n let metrics = Metrics::new(&config);\n\n // Set node health for two nodes\n metrics.set_node_healthy(\"node-1\", true);\n metrics.set_node_healthy(\"node-2\", false);\n\n let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n let output = encoded.as_str();\n\n // Verify node_id label is present and values are correct\n assert!(\n output.contains(\"miroir_node_healthy\") &&\n output.contains(\"node-1\") &&\n output.contains(\" 1\"),\n \"Expected node-1 healthy metric not found. Output:\\n{}\",\n output\n );\n assert!(\n output.contains(\"miroir_node_healthy\") &&\n output.contains(\"node-2\") &&\n output.contains(\" 0\"),\n \"Expected node-2 unhealthy metric not found. Output:\\n{}\",\n output\n );\n}\n\n#[test]\nfn test_node_request_duration_has_operation_label() {\n let config = MiroirConfig::default();\n let metrics = Metrics::new(&config);\n\n // Record a node request duration\n metrics.record_node_request_duration(\"node-1\", \"search\", 0.05);\n\n let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n let output = encoded.as_str();\n\n // Verify operation label is present (format may vary: \"node-1\",\"search\" or node_id=\"node-1\",operation=\"search\")\n assert!(\n output.contains(\"miroir_node_request_duration_seconds\") &&\n output.contains(\"node-1\") &&\n output.contains(\"search\"),\n \"Expected node request duration metric with node_id and operation labels not found. 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Checking port 9090 /metrics endpoint (unauthenticated)...\"\n37\tMETRICS_9090=$(curl -s \"${METRICS_URL}/metrics\" 2>/dev/null || echo \"\")\n38\tif [ -z \"$METRICS_9090\" ]; then\n39\t echo \" ❌ FAILED: Could not connect to ${METRICS_URL}/metrics\"\n40\t exit 1\n41\tfi\n42\techo \" ✓ Connected to ${METRICS_URL}/metrics\"\n43\t\n44\techo \"\"\n45\techo \"2. Checking port 7700 /_miroir/metrics endpoint (admin-key gated)...\"\n46\tMETRICS_7700=$(curl -s -H \"Authorization: Bearer ${ADMIN_KEY}\" \"${BASE_URL}/_miroir/metrics\" 2>/dev/null || echo \"\")\n47\tif [ -z \"$METRICS_7700\" ]; then\n48\t echo \" ❌ FAILED: Could not connect to ${BASE_URL}/_miroir/metrics\"\n49\t exit 1\n50\tfi\n51\techo \" ✓ Connected to ${BASE_URL}/_miroir/metrics\"\n52\t\n53\techo \"\"\n54\techo \"3. Verifying /_miroir/metrics requires admin authentication...\"\n55\tUNAUTH_RESPONSE=$(curl -s -w \"%{http_code}\" \"${BASE_URL}/_miroir/metrics\" -o /dev/null 2>/dev/null || echo \"000\")\n56\tif [ \"$UNAUTH_RESPONSE\" != \"401\" ] && [ \"$UNAUTH_RESPONSE\" != \"403\" ]; then\n57\t echo \" ❌ FAILED: /_miroir/metrics returned ${UNAUTH_RESPONSE} (expected 401/403)\"\n58\t exit 1\n59\tfi\n60\techo \" ✓ /_miroir/metrics requires authentication (returned ${UNAUTH_RESPONSE})\"\n61\t\n62\techo \"\"\n63\techo \"4. Verifying all core metrics are present...\"\n64\tMISSING_COUNT=0\n65\tfor metric in \"${CORE_METRICS[@]}\"; do\n66\t if echo \"$METRICS_9090\" | grep -q \"^${metric}\"; then\n67\t echo \" ✓ ${metric}\"\n68\t else\n69\t echo \" ❌ MISSING: ${metric}\"\n70\t MISSING_COUNT=$((MISSING_COUNT + 1))\n71\t fi\n72\tdone\n73\t\n74\tif [ $MISSING_COUNT -gt 0 ]; then\n75\t echo \"\"\n76\t echo \"❌ FAILED: ${MISSING_COUNT} core metrics are missing\"\n77\t exit 1\n78\tfi\n79\t\n80\techo \"\"\n81\techo \"5. Verifying path_template labels have no UUIDs...\"\n82\t# Check for potential UUID patterns in path_template labels\n83\tif echo \"$METRICS_9090\" | grep -q 'path_template=\".*[0-9a-f]\\{8\\}-[0-9a-f]\\{4\\}-[0-9a-f]\\{4\\}-[0-9a-f]\\{4\\}-[0-9a-f]\\{12\\}'; then\n84\t echo \" ❌ FAILED: Found potential UUID in path_template label\"\n85\t exit 1\n86\tfi\n87\techo \" ✓ No UUIDs found in path_template labels\"\n88\t\n89\techo \"\"\n90\techo \"6. Verifying both endpoints return identical data...\"\n91\t# Sort and compare the metrics output (ignore HELP/TYPE lines for comparison)\n92\tMETRICS_9090_SORTED=$(echo \"$METRICS_9090\" | grep -v \"^#\" | grep -v \"^$\" | sort)\n93\tMETRICS_7700_SORTED=$(echo \"$METRICS_7700\" | grep -v \"^#\" | grep -v \"^$\" | sort)\n94\tif [ \"$METRICS_9090_SORTED\" != \"$METRICS_7700_SORTED\" ]; then\n95\t echo \" ❌ FAILED: Metrics differ between :9090/metrics and :7700/_miroir/metrics\"\n96\t exit 1\n97\tfi\n98\techo \" ✓ Both endpoints return identical metrics data\"\n99\t\n100\techo \"\"\n101\techo \"=== All Verifications Passed ✓ ===\"\n102\techo \"\"\n103\techo \"Summary:\"\n104\techo \" - All 18 core metrics are registered\"\n105\techo \" - Port 9090 /metrics is accessible (unauthenticated, pod-internal)\"\n106\techo \" - Port 7700 /_miroir/metrics requires admin authentication\"\n107\techo \" - Both endpoints return identical data\"\n108\techo \" - path_template labels contain no UUIDs\"\n109\t"}]},"parent_tool_use_id":null,"session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"65c6d818-42b0-48b6-868a-154e8729393a","timestamp":"2026-05-23T06:24:18.314Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/tests/verify_p7_1_core_metrics.sh","content":"#!/bin/bash\n# Verification script for P7.1 Core metrics families\n# Tests that all core metrics are properly registered and accessible\n\nset -e\n\nADMIN_KEY=\"${MIROIR_ADMIN_API_KEY:-admin123}\"\nBASE_URL=\"${MIROIR_BASE_URL:-http://localhost:7700}\"\nMETRICS_URL=\"${MIROIR_METRICS_URL:-http://localhost:9090}\"\n\necho \"=== P7.1 Core Metrics Verification ===\"\necho \"\"\n\n# Expected core metric names (from plan §10)\nCORE_METRICS=(\n \"miroir_request_duration_seconds\"\n \"miroir_requests_total\"\n \"miroir_requests_in_flight\"\n \"miroir_node_healthy\"\n \"miroir_node_request_duration_seconds\"\n \"miroir_node_errors_total\"\n \"miroir_shard_coverage\"\n \"miroir_degraded_shards_total\"\n \"miroir_shard_distribution\"\n \"miroir_task_processing_age_seconds\"\n \"miroir_tasks_total\"\n \"miroir_task_registry_size\"\n \"miroir_scatter_fan_out_size\"\n \"miroir_scatter_partial_responses_total\"\n \"miroir_scatter_retries_total\"\n \"miroir_rebalance_in_progress\"\n \"miroir_rebalance_documents_migrated_total\"\n \"miroir_rebalance_duration_seconds\"\n)\n\necho \"1. Checking port 9090 /metrics endpoint (unauthenticated)...\"\nMETRICS_9090=$(curl -s \"${METRICS_URL}/metrics\" 2>/dev/null || echo \"\")\nif [ -z \"$METRICS_9090\" ]; then\n echo \" ❌ FAILED: Could not connect to ${METRICS_URL}/metrics\"\n exit 1\nfi\necho \" ✓ Connected to ${METRICS_URL}/metrics\"\n\necho \"\"\necho \"2. Checking port 7700 /_miroir/metrics endpoint (admin-key gated)...\"\nMETRICS_7700=$(curl -s -H \"Authorization: Bearer ${ADMIN_KEY}\" \"${BASE_URL}/_miroir/metrics\" 2>/dev/null || echo \"\")\nif [ -z \"$METRICS_7700\" ]; then\n echo \" ❌ FAILED: Could not connect to ${BASE_URL}/_miroir/metrics\"\n exit 1\nfi\necho \" ✓ Connected to ${BASE_URL}/_miroir/metrics\"\n\necho \"\"\necho \"3. Verifying /_miroir/metrics requires admin authentication...\"\nUNAUTH_RESPONSE=$(curl -s -w \"%{http_code}\" \"${BASE_URL}/_miroir/metrics\" -o /dev/null 2>/dev/null || echo \"000\")\nif [ \"$UNAUTH_RESPONSE\" != \"401\" ] && [ \"$UNAUTH_RESPONSE\" != \"403\" ]; then\n echo \" ❌ FAILED: /_miroir/metrics returned ${UNAUTH_RESPONSE} (expected 401/403)\"\n exit 1\nfi\necho \" ✓ /_miroir/metrics requires authentication (returned ${UNAUTH_RESPONSE})\"\n\necho \"\"\necho \"4. Verifying all core metrics are present...\"\nMISSING_COUNT=0\nfor metric in \"${CORE_METRICS[@]}\"; do\n if echo \"$METRICS_9090\" | grep -q \"^${metric}\"; then\n echo \" ✓ ${metric}\"\n else\n echo \" ❌ MISSING: ${metric}\"\n MISSING_COUNT=$((MISSING_COUNT + 1))\n fi\ndone\n\nif [ $MISSING_COUNT -gt 0 ]; then\n echo \"\"\n echo \"❌ FAILED: ${MISSING_COUNT} core metrics are missing\"\n exit 1\nfi\n\necho \"\"\necho \"5. Verifying path_template labels have no UUIDs...\"\n# Check for potential UUID patterns in path_template labels\nif echo \"$METRICS_9090\" | grep -q 'path_template=\".*[0-9a-f]\\{8\\}-[0-9a-f]\\{4\\}-[0-9a-f]\\{4\\}-[0-9a-f]\\{4\\}-[0-9a-f]\\{12\\}'; then\n echo \" ❌ FAILED: Found potential UUID in path_template label\"\n exit 1\nfi\necho \" ✓ No UUIDs found in path_template labels\"\n\necho \"\"\necho \"6. Verifying both endpoints return identical data...\"\n# Sort and compare the metrics output (ignore HELP/TYPE lines for comparison)\nMETRICS_9090_SORTED=$(echo \"$METRICS_9090\" | grep -v \"^#\" | grep -v \"^$\" | sort)\nMETRICS_7700_SORTED=$(echo \"$METRICS_7700\" | grep -v \"^#\" | grep -v \"^$\" | sort)\nif [ \"$METRICS_9090_SORTED\" != \"$METRICS_7700_SORTED\" ]; then\n echo \" ❌ FAILED: Metrics differ between :9090/metrics and :7700/_miroir/metrics\"\n exit 1\nfi\necho \" ✓ Both endpoints return identical metrics data\"\n\necho \"\"\necho \"=== All Verifications Passed ✓ ===\"\necho \"\"\necho \"Summary:\"\necho \" - All 18 core metrics are registered\"\necho \" - Port 9090 /metrics is accessible (unauthenticated, pod-internal)\"\necho \" - Port 7700 /_miroir/metrics requires admin authentication\"\necho \" - Both endpoints return identical data\"\necho \" - path_template labels contain no UUIDs\"\n","numLines":109,"startLine":1,"totalLines":109}}} 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Now let me also fix the `record_scatter_fan_out` call - the method signature expects `u64` but `3` as a literal should work. Let me check if there are any other issues.\n\nActually, looking at line 90, the method is called as `metrics.record_scatter_fan_out(3)` which should work since the method signature is `record_scatter_fan_out(&self, size: u64)` and `3` is a u32 literal that gets coerced to u64.\n\nBut wait, looking at the accessor method definition on line 1224:\n```rust\npub fn record_scatter_fan_out(&self, size: u64) {\n self.scatter_fan_out_size.observe(size as f64);\n}\n```\n\nThis should work fine. 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crates/miroir-core/src/anti_entropy.rs:12:5\n |\n12 | use std::collections::HashMap;\n | ^^^^^^^^^^^^^^^^^^^^^^^^^\n\nwarning: unused import: `crate::router::shard_for_key`\n --> crates/miroir-core/src/explainer.rs:7:5\n |\n7 | use crate::router::shard_for_key;\n | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n\nwarning: unused imports: `MiroirError` and `Result`\n --> crates/miroir-core/src/hedging.rs:6:20\n |\n6 | use crate::error::{MiroirError, Result};\n | ^^^^^^^^^^^ ^^^^^^\n\nwarning: unused imports: `Instant` and `sleep`\n --> crates/miroir-core/src/hedging.rs:14:19\n |\n14 | use tokio::time::{sleep, Instant};\n | ^^^^^ ^^^^^^^\n\nwarning: unused import: `std::future::Future`\n --> crates/miroir-core/src/multi_search.rs:10:5\n |\n10 | use std::future::Future;\n | ^^^^^^^^^^^^^^^^^^^\n\nwarning: unused import: `Instant`\n --> crates/miroir-core/src/rebalancer_worker/drift_reconciler.rs:16:27\n |\n16 | use std::time::{Duration, Instant};\n | ^^^^^^^\n\nwarning: unused import: `tokio::sync::RwLock`\n --> crates/miroir-core/src/rebalancer_worker/drift_reconciler.rs:17:5\n |\n17 | use tokio::sync::RwLock;\n | ^^^^^^^^^^^^^^^^^^^\n\nwarning: unused imports: `MiroirError` and `Result`\n --> crates/miroir-core/src/replica_selection.rs:6:20\n |\n6 | use crate::error::{MiroirError, Result};\n | ^^^^^^^^^^^ ^^^^^^\n\nwarning: unused import: `Group`\n --> crates/miroir-core/src/replica_selection.rs:7:23\n |\n7 | use crate::topology::{Group, NodeId};\n | ^^^^^\n\nwarning: unused import: `Duration`\n --> crates/miroir-core/src/replica_selection.rs:12:17\n |\n12 | use std::time::{Duration, Instant};\n | ^^^^^^^^\n\nwarning: unused import: `MiroirError`\n --> crates/miroir-core/src/ttl.rs:6:20\n |\n6 | use crate::error::{MiroirError, Result};\n | ^^^^^^^^^^^\n\nwarning: unused variable: `replica_groups`\n --> crates/miroir-core/src/anti_entropy.rs:160:13\n |\n160 | let replica_groups = topology.groups().count() as u32;\n | ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_replica_groups`\n |\n = note: `#[warn(unused_variables)]` on by default\n\nwarning: unused variable: `reference`\n --> crates/miroir-core/src/anti_entropy.rs:288:9\n |\n288 | reference: &ShardFingerprint,\n | ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_reference`\n\nwarning: unused variable: `job`\n --> crates/miroir-core/src/rebalancer_worker/mod.rs:922:22\n |\n922 | for (job_id, job) in active_jobs","is_error":false}]},"parent_tool_use_id":null,"session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"27a343a5-0d13-4381-b040-d1edf7c13b11","timestamp":"2026-05-23T06:25:08.489Z","tool_use_result":{"stdout":" Blocking waiting for file lock on build directory\n Compiling miroir-core v0.1.0 (/home/coding/miroir/crates/miroir-core)\nwarning: unused import: `MiroirError`\n --> crates/miroir-core/src/anti_entropy.rs:7:20\n |\n7 | use crate::error::{MiroirError, Result};\n | ^^^^^^^^^^^\n |\n = note: `#[warn(unused_imports)]` on by default\n\nwarning: unused import: `Group`\n --> crates/miroir-core/src/anti_entropy.rs:10:23\n |\n10 | use crate::topology::{Group, NodeId, Topology};\n | ^^^^^\n\nwarning: unused import: `std::collections::HashMap`\n --> crates/miroir-core/src/anti_entropy.rs:12:5\n |\n12 | use std::collections::HashMap;\n | ^^^^^^^^^^^^^^^^^^^^^^^^^\n\nwarning: unused import: `crate::router::shard_for_key`\n --> crates/miroir-core/src/explainer.rs:7:5\n |\n7 | use crate::router::shard_for_key;\n | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n\nwarning: unused imports: `MiroirError` and `Result`\n --> crates/miroir-core/src/hedging.rs:6:20\n |\n6 | use crate::error::{MiroirError, Result};\n | ^^^^^^^^^^^ ^^^^^^\n\nwarning: unused imports: `Instant` and `sleep`\n --> crates/miroir-core/src/hedging.rs:14:19\n |\n14 | use tokio::time::{sleep, Instant};\n | ^^^^^ ^^^^^^^\n\nwarning: unused import: `std::future::Future`\n --> crates/miroir-core/src/multi_search.rs:10:5\n |\n10 | use std::future::Future;\n | ^^^^^^^^^^^^^^^^^^^\n\nwarning: unused import: `Instant`\n --> crates/miroir-core/src/rebalancer_worker/drift_reconciler.rs:16:27\n |\n16 | use std::time::{Duration, Instant};\n | ^^^^^^^\n\nwarning: unused import: `tokio::sync::RwLock`\n --> crates/miroir-core/src/rebalancer_worker/drift_reconciler.rs:17:5\n |\n17 | use tokio::sync::RwLock;\n | ^^^^^^^^^^^^^^^^^^^\n\nwarning: unused imports: `MiroirError` and `Result`\n --> crates/miroir-core/src/replica_selection.rs:6:20\n |\n6 | use crate::error::{MiroirError, Result};\n | ^^^^^^^^^^^ ^^^^^^\n\nwarning: unused import: `Group`\n --> crates/miroir-core/src/replica_selection.rs:7:23\n |\n7 | use crate::topology::{Group, NodeId};\n | ^^^^^\n\nwarning: unused import: `Duration`\n --> crates/miroir-core/src/replica_selection.rs:12:17\n |\n12 | use std::time::{Duration, Instant};\n | ^^^^^^^^\n\nwarning: unused import: `MiroirError`\n --> crates/miroir-core/src/ttl.rs:6:20\n |\n6 | use crate::error::{MiroirError, Result};\n | ^^^^^^^^^^^\n\nwarning: unused variable: `replica_groups`\n --> crates/miroir-core/src/anti_entropy.rs:160:13\n |\n160 | let replica_groups = topology.groups().count() as u32;\n | ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_replica_groups`\n |\n = note: `#[warn(unused_variables)]` on by default\n\nwarning: unused variable: `reference`\n --> crates/miroir-core/src/anti_entropy.rs:288:9\n |\n288 | reference: &ShardFingerprint,\n | ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_reference`\n\nwarning: unused variable: `job`\n --> crates/miroir-core/src/rebalancer_worker/mod.rs:922:22\n |\n922 | for (job_id, job) in active_jobs","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false}} +{"type":"system","subtype":"status","status":"requesting","uuid":"2e7c889f-5cb1-4c35-accb-2f89986426a8","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379"} 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tests/p29_reserved_field_rejection.rs (target/debug/deps/p29_reserved_field_rejection-d4fe32442ccfbe16)\n\nrunning 0 tests\n\ntest result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 6 filtered out; finished in 0.00s\n\n Running tests/p2_phase2_dod.rs (target/debug/deps/p2_phase2_dod-d584bdde4d72ca91)\n\nrunning 0 tests\n\ntest result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 14 filtered out; finished in 0.00s\n\n Running tests/p3_phase3_task_registry.rs (target/debug/deps/p3_phase3_task_registry-16b4801047bc1029)\n\nrunning 0 tests\n\ntest result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 12 filtered out; finished in 0.00s\n\n Running tests/p5_5_two_phase_settings_broadcast.rs (target/debug/deps/p5_5_two_phase_settings_broadcast-3b4ede7569032392)\n\nrunning 0 tests\n\ntest result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 8 filtered out; finished in 0.00s\n\n Running tests/p7_1_core_metrics.rs (target/debug/deps/p7_1_core_metrics-250c105a13088399)\n\nrunning 0 tests\n\ntest result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 5 filtered out; finished in 0.00s\n\n Running tests/p7_5_structured_logging.rs (target/debug/deps/p7_5_structured_logging-31fa71c7a2228682)\n\nrunning 0 tests\n\ntest result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 17 filtered out; finished in 0.00s","is_error":false}]},"parent_tool_use_id":null,"session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"337db2fb-abf4-4d3d-b29e-6b87e8660045","timestamp":"2026-05-23T06:25:48.533Z","tool_use_result":{"stdout":"test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 11 filtered out; finished in 0.00s\n\n Running tests/p13_7_full_alias_integration.rs (target/debug/deps/p13_7_full_alias_integration-9cba7f698f0811c2)\n\nrunning 0 tests\n\ntest result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 14 filtered out; finished in 0.00s\n\n Running tests/p24_index_lifecycle.rs (target/debug/deps/p24_index_lifecycle-0014b96c8e44d830)\n\nrunning 0 tests\n\ntest result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 11 filtered out; finished in 0.00s\n\n Running tests/p29_reserved_field_rejection.rs (target/debug/deps/p29_reserved_field_rejection-d4fe32442ccfbe16)\n\nrunning 0 tests\n\ntest result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 6 filtered out; finished in 0.00s\n\n Running tests/p2_phase2_dod.rs (target/debug/deps/p2_phase2_dod-d584bdde4d72ca91)\n\nrunning 0 tests\n\ntest result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 14 filtered out; finished in 0.00s\n\n Running tests/p3_phase3_task_registry.rs (target/debug/deps/p3_phase3_task_registry-16b4801047bc1029)\n\nrunning 0 tests\n\ntest result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 12 filtered out; finished in 0.00s\n\n Running tests/p5_5_two_phase_settings_broadcast.rs (target/debug/deps/p5_5_two_phase_settings_broadcast-3b4ede7569032392)\n\nrunning 0 tests\n\ntest result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 8 filtered out; finished in 0.00s\n\n Running 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P7.1 Core metrics families acceptance tests.\n2\t//!\n3\t//! Verifies that all plan §10 core metrics are properly registered and accessible.\n4\t\n5\tuse miroir_proxy::middleware::Metrics;\n6\tuse miroir_core::config::MiroirConfig;\n7\t\n8\t#[test]\n9\tfn test_all_core_metrics_registered() {\n10\t let config = MiroirConfig::default();\n11\t let metrics = Metrics::new(&config);\n12\t\n13\t // Add sample data to ensure metrics appear in output\n14\t // Request metrics - recorded via telemetry_middleware in integration tests\n15\t // Here we just verify the metrics are registered\n16\t\n17\t // Node metrics\n18\t metrics.set_node_healthy(\"node-1\", true);\n19\t metrics.record_node_request_duration(\"node-1\", \"search\", 0.05);\n20\t metrics.inc_node_errors(\"node-1\", \"timeout\");\n21\t\n22\t // Shard metrics - use f64 for values\n23\t metrics.set_shard_coverage(1.0);\n24\t metrics.set_degraded_shards(0.0);\n25\t metrics.set_shard_distribution(\"node-1\", 32.0);\n26\t\n27\t // Task metrics\n28\t metrics.observe_task_processing_age(0.1);\n29\t metrics.inc_tasks_total(\"completed\");\n30\t metrics.set_task_registry_size(5.0);\n31\t\n32\t // Scatter-gather metrics\n33\t metrics.record_scatter_fan_out(3);\n34\t metrics.inc_scatter_partial_responses();\n35\t metrics.inc_scatter_retries();\n36\t\n37\t // Rebalancer metrics\n38\t metrics.set_rebalance_in_progress(false);\n39\t metrics.inc_rebalance_documents_migrated(100);\n40\t metrics.observe_rebalance_duration(10.0);\n41\t\n42\t let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n43\t let output = encoded.as_str();\n44\t\n45\t // Verify all 18 core plan §10 metric names appear in the output\n46\t let expected_metrics = [\n47\t // Request metrics (3)\n48\t \"miroir_request_duration_seconds\",\n49\t \"miroir_requests_total\",\n50\t \"miroir_requests_in_flight\",\n51\t // Node health metrics (3)\n52\t \"miroir_node_healthy\",\n53\t \"miroir_node_request_duration_seconds\",\n54\t \"miroir_node_errors_total\",\n55\t // Shard metrics (3)\n56\t \"miroir_shard_coverage\",\n57\t \"miroir_degraded_shards_total\",\n58\t \"miroir_shard_distribution\",\n59\t // Task metrics (3)\n60\t \"miroir_task_processing_age_seconds\",\n61\t \"miroir_tasks_total\",\n62\t \"miroir_task_registry_size\",\n63\t // Scatter-gather metrics (3)\n64\t \"miroir_scatter_fan_out_size\",\n65\t \"miroir_scatter_partial_responses_total\",\n66\t \"miroir_scatter_retries_total\",\n67\t // Rebalancer metrics (3)\n68\t \"miroir_rebalance_in_progress\",\n69\t \"miroir_rebalance_documents_migrated_total\",\n70\t \"miroir_rebalance_duration_seconds\",\n71\t ];\n72\t\n73\t for name in &expected_metrics {\n74\t assert!(\n75\t output.contains(name),\n76\t \"missing core metric: {}\",\n77\t name\n78\t );\n79\t }\n80\t}\n81\t\n82\t#[test]\n83\tfn test_scatter_fan_out_metric_records_correctly() {\n84\t let config = MiroirConfig::default();\n85\t let metrics = Metrics::new(&config);\n86\t\n87\t // Record a scatter operation that hit 3 nodes\n88\t metrics.record_scatter_fan_out(3);\n89\t\n90\t let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n91\t let output = encoded.as_str();\n92\t\n93\t // Verify the metric is present\n94\t assert!(\n95\t output.contains(\"miroir_scatter_fan_out_size\"),\n96\t \"miroir_scatter_fan_out_size metric not found\"\n97\t );\n98\t\n99\t // Verify the sample value is recorded (histogram buckets should show a sample at 3.0)\n100\t // Note: Prometheus histogram buckets use le=\"3.0\" format, not le=\"3\"\n101\t assert!(\n102\t output.contains(\"miroir_scatter_fan_out_size_bucket{le=\\\"3.0\\\"} 1\"),\n103\t \"Expected histogram sample at bucket 3.0 not found. Output:\\n{}\",\n104\t output\n105\t );\n106\t}\n107\t\n108\t#[test]\n109\tfn test_node_health_metrics_have_correct_labels() {\n110\t let config = MiroirConfig::default();\n111\t let metrics = Metrics::new(&config);\n112\t\n113\t // Set node health for two nodes\n114\t metrics.set_node_healthy(\"node-1\", true);\n115\t metrics.set_node_healthy(\"node-2\", false);\n116\t\n117\t let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n118\t let output = encoded.as_str();\n119\t\n120\t // Verify node_id label is present and values are correct\n121\t assert!(\n122\t output.contains(\"miroir_node_healthy\") &&\n123\t output.contains(\"node-1\") &&\n124\t output.contains(\" 1\"),\n125\t \"Expected node-1 healthy metric not found. Output:\\n{}\",\n126\t output\n127\t );\n128\t assert!(\n129\t output.contains(\"miroir_node_healthy\") &&\n130\t output.contains(\"node-2\") &&\n131\t output.contains(\" 0\"),\n132\t \"Expected node-2 unhealthy metric not found. Output:\\n{}\",\n133\t output\n134\t );\n135\t}\n136\t\n137\t#[test]\n138\tfn test_node_request_duration_has_operation_label() {\n139\t let config = MiroirConfig::default();\n140\t let metrics = Metrics::new(&config);\n141\t\n142\t // Record a node request duration\n143\t metrics.record_node_request_duration(\"node-1\", \"search\", 0.05);\n144\t\n145\t let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n146\t let output = encoded.as_str();\n147\t\n148\t // Verify operation label is present (format may vary: \"node-1\",\"search\" or node_id=\"node-1\",operation=\"search\")\n149\t assert!(\n150\t output.contains(\"miroir_node_request_duration_seconds\") &&\n151\t output.contains(\"node-1\") &&\n152\t output.contains(\"search\"),\n153\t \"Expected node request duration metric with node_id and operation labels not found. 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Verifies that all plan §10 core metrics are properly registered and accessible.\n\nuse miroir_proxy::middleware::Metrics;\nuse miroir_core::config::MiroirConfig;\n\n#[test]\nfn test_all_core_metrics_registered() {\n let config = MiroirConfig::default();\n let metrics = Metrics::new(&config);\n\n // Add sample data to ensure metrics appear in output\n // Request metrics - recorded via telemetry_middleware in integration tests\n // Here we just verify the metrics are registered\n\n // Node metrics\n metrics.set_node_healthy(\"node-1\", true);\n metrics.record_node_request_duration(\"node-1\", \"search\", 0.05);\n metrics.inc_node_errors(\"node-1\", \"timeout\");\n\n // Shard metrics - use f64 for values\n metrics.set_shard_coverage(1.0);\n metrics.set_degraded_shards(0.0);\n metrics.set_shard_distribution(\"node-1\", 32.0);\n\n // Task metrics\n metrics.observe_task_processing_age(0.1);\n metrics.inc_tasks_total(\"completed\");\n metrics.set_task_registry_size(5.0);\n\n // Scatter-gather metrics\n metrics.record_scatter_fan_out(3);\n metrics.inc_scatter_partial_responses();\n metrics.inc_scatter_retries();\n\n // Rebalancer metrics\n metrics.set_rebalance_in_progress(false);\n metrics.inc_rebalance_documents_migrated(100);\n metrics.observe_rebalance_duration(10.0);\n\n let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n let output = encoded.as_str();\n\n // Verify all 18 core plan §10 metric names appear in the output\n let expected_metrics = [\n // Request metrics (3)\n \"miroir_request_duration_seconds\",\n \"miroir_requests_total\",\n \"miroir_requests_in_flight\",\n // Node health metrics (3)\n \"miroir_node_healthy\",\n \"miroir_node_request_duration_seconds\",\n \"miroir_node_errors_total\",\n // Shard metrics (3)\n \"miroir_shard_coverage\",\n \"miroir_degraded_shards_total\",\n \"miroir_shard_distribution\",\n // Task metrics (3)\n \"miroir_task_processing_age_seconds\",\n \"miroir_tasks_total\",\n \"miroir_task_registry_size\",\n // Scatter-gather metrics (3)\n \"miroir_scatter_fan_out_size\",\n \"miroir_scatter_partial_responses_total\",\n \"miroir_scatter_retries_total\",\n // Rebalancer metrics (3)\n \"miroir_rebalance_in_progress\",\n \"miroir_rebalance_documents_migrated_total\",\n \"miroir_rebalance_duration_seconds\",\n ];\n\n for name in &expected_metrics {\n assert!(\n output.contains(name),\n \"missing core metric: {}\",\n name\n );\n }\n}\n\n#[test]\nfn test_scatter_fan_out_metric_records_correctly() {\n let config = MiroirConfig::default();\n let metrics = Metrics::new(&config);\n\n // Record a scatter operation that hit 3 nodes\n metrics.record_scatter_fan_out(3);\n\n let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n let output = encoded.as_str();\n\n // Verify the metric is present\n assert!(\n output.contains(\"miroir_scatter_fan_out_size\"),\n \"miroir_scatter_fan_out_size metric not found\"\n );\n\n // Verify the sample value is recorded (histogram buckets should show a sample at 3.0)\n // Note: Prometheus histogram buckets use le=\"3.0\" format, not le=\"3\"\n assert!(\n output.contains(\"miroir_scatter_fan_out_size_bucket{le=\\\"3.0\\\"} 1\"),\n \"Expected histogram sample at bucket 3.0 not found. Output:\\n{}\",\n output\n );\n}\n\n#[test]\nfn test_node_health_metrics_have_correct_labels() {\n let config = MiroirConfig::default();\n let metrics = Metrics::new(&config);\n\n // Set node health for two nodes\n metrics.set_node_healthy(\"node-1\", true);\n metrics.set_node_healthy(\"node-2\", false);\n\n let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n let output = encoded.as_str();\n\n // Verify node_id label is present and values are correct\n assert!(\n output.contains(\"miroir_node_healthy\") &&\n output.contains(\"node-1\") &&\n output.contains(\" 1\"),\n \"Expected node-1 healthy metric not found. Output:\\n{}\",\n output\n );\n assert!(\n output.contains(\"miroir_node_healthy\") &&\n output.contains(\"node-2\") &&\n output.contains(\" 0\"),\n \"Expected node-2 unhealthy metric not found. Output:\\n{}\",\n output\n );\n}\n\n#[test]\nfn test_node_request_duration_has_operation_label() {\n let config = MiroirConfig::default();\n let metrics = Metrics::new(&config);\n\n // Record a node request duration\n metrics.record_node_request_duration(\"node-1\", \"search\", 0.05);\n\n let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n let output = encoded.as_str();\n\n // Verify operation label is present (format may vary: \"node-1\",\"search\" or node_id=\"node-1\",operation=\"search\")\n assert!(\n output.contains(\"miroir_node_request_duration_seconds\") &&\n output.contains(\"node-1\") &&\n output.contains(\"search\"),\n \"Expected node request duration metric with node_id and operation labels not found. 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Let me run them with more output to see what's wrong:"}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":null,"session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"275006ad-63ff-4338-8d02-127125eb7579"} +{"type":"stream_event","event":{"type":"content_block_stop","index":1},"session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","parent_tool_use_id":null,"uuid":"37710387-f3de-421b-b991-c592a3f2fd9b"} +{"type":"stream_event","event":{"type":"content_block_start","index":2,"content_block":{"type":"tool_use","id":"call_bc6c9d705f87474e8c026cbe","name":"Bash","input":{}}},"session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","parent_tool_use_id":null,"uuid":"cb449b4e-66df-4848-9941-52a56afa1c2f"} +{"type":"stream_event","event":{"type":"content_block_delta","index":2,"delta":{"type":"input_json_delta","partial_json":"{\"command\":\"cargo test -p miroir-proxy --test p7_1_core_metrics -- --nocapture 2>&1 | grep -A 30 \\\"test_all_core_metrics_registered\\\\|test_scatter_fan_out\\\"\",\"description\":\"Run tests with output to see failures\"}"}},"session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","parent_tool_use_id":null,"uuid":"15ce574e-8807-465c-a4b9-ffe2fce58cc6"} +{"type":"assistant","message":{"id":"msg_20260523142602ecd8ef5a87c04868","type":"message","role":"assistant","model":"glm-4.7","content":[{"type":"tool_use","id":"call_bc6c9d705f87474e8c026cbe","name":"Bash","input":{"command":"cargo test -p miroir-proxy --test p7_1_core_metrics -- --nocapture 2>&1 | grep -A 30 \"test_all_core_metrics_registered\\|test_scatter_fan_out\"","description":"Run tests with output to see failures"}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":null,"session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"4824d3fd-baf1-4caa-9ed2-e58bbadb6257"} +{"type":"stream_event","event":{"type":"content_block_stop","index":2},"session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","parent_tool_use_id":null,"uuid":"526439fb-e69c-4e73-b4a7-ccbcc8a81386"} +{"type":"stream_event","event":{"type":"message_delta","delta":{"stop_reason":"tool_use","stop_sequence":null},"usage":{"input_tokens":587,"output_tokens":133,"cache_read_input_tokens":63808,"server_tool_use":{"web_search_requests":0},"service_tier":"standard"}},"session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","parent_tool_use_id":null,"uuid":"e3681f3d-6bb9-4d5c-a62c-e821e7c91b0f"} +{"type":"stream_event","event":{"type":"message_stop"},"session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","parent_tool_use_id":null,"uuid":"ba59d986-2f5c-4d90-9399-f61e640f5983"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_bc6c9d705f87474e8c026cbe","type":"tool_result","content":"thread 'test_all_core_metrics_registered' panicked at crates/miroir-proxy/tests/p7_1_core_metrics.rs:74:9:\nmissing core metric: miroir_request_duration_seconds\nnote: run with `RUST_BACKTRACE=1` environment variable to display a backtrace\ntest test_node_health_metrics_have_correct_labels ... ok\ntest test_all_core_metrics_registered ... FAILED\n\nthread 'test_scatter_fan_out_metric_records_correctly' panicked at crates/miroir-proxy/tests/p7_1_core_metrics.rs:101:5:\nExpected histogram sample at bucket 3.0 not found. Output:\n# HELP miroir_admin_session_key_generated Whether ADMIN_SESSION_SEAL_KEY was generated at startup (1=yes, 0=set via env)\n# TYPE miroir_admin_session_key_generated gauge\nmiroir_admin_session_key_generated 0\n# HELP miroir_admin_session_revoked_total Admin sessions revoked via logout\n# TYPE miroir_admin_session_revoked_total counter\nmiroir_admin_session_revoked_total 0\n# HELP miroir_admin_ui_sessions_total Admin UI sessions started\n# TYPE miroir_admin_ui_sessions_total counter\nmiroir_admin_ui_sessions_total 0\n# HELP miroir_cpu_throttled_seconds_total Total seconds of CPU throttling\n# TYPE miroir_cpu_throttled_seconds_total counter\nmiroir_cpu_throttled_seconds_total 0\n# HELP miroir_degraded_shards_total Number of shards with reduced replica availability\n# TYPE miroir_degraded_shards_total gauge\nmiroir_degraded_shards_total 0\n# HELP miroir_explain_execute_total Explain requests with execute=true\n# TYPE miroir_explain_execute_total counter\nmiroir_explain_execute_total 0\n# HELP miroir_explain_requests_total Explain API requests\n# TYPE miroir_explain_requests_total counter\nmiroir_explain_requests_total 0\n# HELP miroir_leader Whether this pod holds the leader lease (1=yes, 0=no)\n# TYPE miroir_leader gauge\nmiroir_leader 0\n# HELP miroir_memory_pressure Memory pressure level (0=none, 1=low, 2=moderate/high)\n# TYPE miroir_memory_pressure gauge\nmiroir_memory_pressure 0\n# HELP miroir_multisearch_batches_total Total number of multi-search batches processed\n# TYPE miroir_multisearch_batches_total counter\n--\ntest test_scatter_fan_out_metric_records_correctly ... FAILED\ntest test_node_request_duration_has_operation_label ... ok\ntest test_task_metrics_have_status_label ... ok\n\nfailures:\n\nfailures:\n test_all_core_metrics_registered\n test_scatter_fan_out_metric_records_correctly\n\ntest result: FAILED. 3 passed; 2 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s\n\nerror: test failed, to rerun pass `-p miroir-proxy --test p7_1_core_metrics`","is_error":false}]},"parent_tool_use_id":null,"session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"b9b806b7-88fc-4d0a-b6b7-d696ebd55910","timestamp":"2026-05-23T06:26:06.048Z","tool_use_result":{"stdout":"thread 'test_all_core_metrics_registered' panicked at crates/miroir-proxy/tests/p7_1_core_metrics.rs:74:9:\nmissing core metric: miroir_request_duration_seconds\nnote: run with `RUST_BACKTRACE=1` environment variable to display a backtrace\ntest test_node_health_metrics_have_correct_labels ... ok\ntest test_all_core_metrics_registered ... FAILED\n\nthread 'test_scatter_fan_out_metric_records_correctly' panicked at crates/miroir-proxy/tests/p7_1_core_metrics.rs:101:5:\nExpected histogram sample at bucket 3.0 not found. Output:\n# HELP miroir_admin_session_key_generated Whether ADMIN_SESSION_SEAL_KEY was generated at startup (1=yes, 0=set via env)\n# TYPE miroir_admin_session_key_generated gauge\nmiroir_admin_session_key_generated 0\n# HELP miroir_admin_session_revoked_total Admin sessions revoked via logout\n# TYPE miroir_admin_session_revoked_total counter\nmiroir_admin_session_revoked_total 0\n# HELP miroir_admin_ui_sessions_total Admin UI sessions started\n# TYPE miroir_admin_ui_sessions_total counter\nmiroir_admin_ui_sessions_total 0\n# HELP miroir_cpu_throttled_seconds_total Total seconds of CPU throttling\n# TYPE miroir_cpu_throttled_seconds_total counter\nmiroir_cpu_throttled_seconds_total 0\n# HELP miroir_degraded_shards_total Number of shards with reduced replica availability\n# TYPE miroir_degraded_shards_total gauge\nmiroir_degraded_shards_total 0\n# HELP miroir_explain_execute_total Explain requests with execute=true\n# TYPE miroir_explain_execute_total counter\nmiroir_explain_execute_total 0\n# HELP miroir_explain_requests_total Explain API requests\n# TYPE miroir_explain_requests_total counter\nmiroir_explain_requests_total 0\n# HELP miroir_leader Whether this pod holds the leader lease (1=yes, 0=no)\n# TYPE miroir_leader gauge\nmiroir_leader 0\n# HELP miroir_memory_pressure Memory pressure level (0=none, 1=low, 2=moderate/high)\n# TYPE miroir_memory_pressure gauge\nmiroir_memory_pressure 0\n# HELP miroir_multisearch_batches_total Total number of multi-search batches processed\n# TYPE miroir_multisearch_batches_total counter\n--\ntest test_scatter_fan_out_metric_records_correctly ... 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\\\"miroir_node_healthy\\\",\\n \\\"miroir_node_request_duration_seconds\\\",\\n \\\"miroir_node_errors_total\\\",\\n // Shard metrics (3)\\n \\\"miroir_shard_coverage\\\",\\n \\\"miroir_degraded_shards_total\\\",\\n \\\"miroir_shard_distribution\\\",\\n // Task metrics (3)\\n \\\"miroir_task_processing_age_seconds\\\",\\n \\\"miroir_tasks_total\\\",\\n \\\"miroir_task_registry_size\\\",\\n // Scatter-gather metrics (3)\\n \\\"miroir_scatter_fan_out_size\\\",\\n \\\"miroir_scatter_partial_responses_total\\\",\\n \\\"miroir_scatter_retries_total\\\",\\n // Rebalancer metrics (3)\\n \\\"miroir_rebalance_in_progress\\\",\\n \\\"miroir_rebalance_documents_migrated_total\\\",\\n \\\"miroir_rebalance_duration_seconds\\\",\\n ];\\n\\n for name in &expected_metrics {\\n // Check for HELP or TYPE line (metadata) OR data line for the metric\\n let has_metadata = output.contains(&format!(\\\"# HELP {}\\\", name)) || output.contains(&format!(\\\"# TYPE {}\\\", name));\\n let has_data = output.lines().any(|line| line.starts_with(name));\\n assert!(\\n has_metadata || has_data,\\n \\\"missing core metric: {} (no HELP/TYPE metadata or data lines found)\\\\nOutput snippet:\\\\n{}\\\",\\n name,\\n output.lines().take(50).collect::>().join(\\\"\\\\n\\\")\\n );\\n }\"}"}},"session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","parent_tool_use_id":null,"uuid":"c57a5601-4880-47e9-958d-faedb94574f1"} +{"type":"assistant","message":{"id":"msg_202605231426081a383e21c40b4194","type":"message","role":"assistant","model":"glm-4.7","content":[{"type":"tool_use","id":"call_cbe0d420e2af493787f8e57b","name":"Edit","input":{"replace_all":false,"file_path":"/home/coding/miroir/crates/miroir-proxy/tests/p7_1_core_metrics.rs","old_string":" let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n let output = encoded.as_str();\n\n // Verify all 18 core plan §10 metric names appear in the output\n let expected_metrics = [\n // Request metrics (3)\n \"miroir_request_duration_seconds\",\n \"miroir_requests_total\",\n \"miroir_requests_in_flight\",\n // Node health metrics (3)\n \"miroir_node_healthy\",\n \"miroir_node_request_duration_seconds\",\n \"miroir_node_errors_total\",\n // Shard metrics (3)\n \"miroir_shard_coverage\",\n \"miroir_degraded_shards_total\",\n \"miroir_shard_distribution\",\n // Task metrics (3)\n \"miroir_task_processing_age_seconds\",\n \"miroir_tasks_total\",\n \"miroir_task_registry_size\",\n // Scatter-gather metrics (3)\n \"miroir_scatter_fan_out_size\",\n \"miroir_scatter_partial_responses_total\",\n \"miroir_scatter_retries_total\",\n // Rebalancer metrics (3)\n \"miroir_rebalance_in_progress\",\n \"miroir_rebalance_documents_migrated_total\",\n \"miroir_rebalance_duration_seconds\",\n ];\n\n for name in &expected_metrics {\n assert!(\n output.contains(name),\n \"missing core metric: {}\",\n name\n );\n }","new_string":" let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n let output = encoded.as_str();\n\n // Verify all 18 core plan §10 metric names appear in the output\n // Check for either HELP, TYPE, or data lines for each metric\n let expected_metrics = [\n // Request metrics (3)\n \"miroir_request_duration_seconds\",\n \"miroir_requests_total\",\n \"miroir_requests_in_flight\",\n // Node health metrics (3)\n \"miroir_node_healthy\",\n \"miroir_node_request_duration_seconds\",\n \"miroir_node_errors_total\",\n // Shard metrics (3)\n \"miroir_shard_coverage\",\n \"miroir_degraded_shards_total\",\n \"miroir_shard_distribution\",\n // Task metrics (3)\n \"miroir_task_processing_age_seconds\",\n \"miroir_tasks_total\",\n \"miroir_task_registry_size\",\n // Scatter-gather metrics (3)\n \"miroir_scatter_fan_out_size\",\n \"miroir_scatter_partial_responses_total\",\n \"miroir_scatter_retries_total\",\n // Rebalancer metrics (3)\n \"miroir_rebalance_in_progress\",\n \"miroir_rebalance_documents_migrated_total\",\n \"miroir_rebalance_duration_seconds\",\n ];\n\n for name in &expected_metrics {\n // Check for HELP or TYPE line (metadata) OR data line for the metric\n let has_metadata = output.contains(&format!(\"# HELP {}\", name)) || output.contains(&format!(\"# TYPE {}\", name));\n let has_data = output.lines().any(|line| line.starts_with(name));\n assert!(\n has_metadata || has_data,\n \"missing core metric: {} (no HELP/TYPE metadata or data lines found)\\nOutput snippet:\\n{}\",\n name,\n output.lines().take(50).collect::>().join(\"\\n\")\n );\n }"}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":null,"session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"3b3fa7f0-9458-41e5-81ba-906d28a62eef"} +{"type":"stream_event","event":{"type":"content_block_stop","index":2},"session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","parent_tool_use_id":null,"uuid":"8937c6ca-8b4b-40cd-bd1a-2800c6fb224e"} 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(file state is current in your context — no need to Read it back)"}]},"parent_tool_use_id":null,"session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"6e1edf87-e765-462d-9da4-23ec0c24bdf4","timestamp":"2026-05-23T06:26:24.292Z","tool_use_result":{"filePath":"/home/coding/miroir/crates/miroir-proxy/tests/p7_1_core_metrics.rs","oldString":" let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n let output = encoded.as_str();\n\n // Verify all 18 core plan §10 metric names appear in the output\n let expected_metrics = [\n // Request metrics (3)\n \"miroir_request_duration_seconds\",\n \"miroir_requests_total\",\n \"miroir_requests_in_flight\",\n // Node health metrics (3)\n \"miroir_node_healthy\",\n \"miroir_node_request_duration_seconds\",\n \"miroir_node_errors_total\",\n // Shard metrics (3)\n \"miroir_shard_coverage\",\n \"miroir_degraded_shards_total\",\n \"miroir_shard_distribution\",\n // Task metrics (3)\n \"miroir_task_processing_age_seconds\",\n \"miroir_tasks_total\",\n \"miroir_task_registry_size\",\n // Scatter-gather metrics (3)\n \"miroir_scatter_fan_out_size\",\n \"miroir_scatter_partial_responses_total\",\n \"miroir_scatter_retries_total\",\n // Rebalancer metrics (3)\n \"miroir_rebalance_in_progress\",\n \"miroir_rebalance_documents_migrated_total\",\n \"miroir_rebalance_duration_seconds\",\n ];\n\n for name in &expected_metrics {\n assert!(\n output.contains(name),\n \"missing core metric: {}\",\n name\n );\n }","newString":" let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n let output = encoded.as_str();\n\n // Verify all 18 core plan §10 metric names appear in the output\n // Check for either HELP, TYPE, or data lines for each metric\n let expected_metrics = [\n // Request metrics (3)\n \"miroir_request_duration_seconds\",\n \"miroir_requests_total\",\n \"miroir_requests_in_flight\",\n // Node health metrics (3)\n \"miroir_node_healthy\",\n \"miroir_node_request_duration_seconds\",\n \"miroir_node_errors_total\",\n // Shard metrics (3)\n \"miroir_shard_coverage\",\n \"miroir_degraded_shards_total\",\n \"miroir_shard_distribution\",\n // Task metrics (3)\n \"miroir_task_processing_age_seconds\",\n \"miroir_tasks_total\",\n \"miroir_task_registry_size\",\n // Scatter-gather metrics (3)\n \"miroir_scatter_fan_out_size\",\n \"miroir_scatter_partial_responses_total\",\n \"miroir_scatter_retries_total\",\n // Rebalancer metrics (3)\n \"miroir_rebalance_in_progress\",\n \"miroir_rebalance_documents_migrated_total\",\n \"miroir_rebalance_duration_seconds\",\n ];\n\n for name in &expected_metrics {\n // Check for HELP or TYPE line (metadata) OR data line for the metric\n let has_metadata = output.contains(&format!(\"# HELP {}\", name)) || output.contains(&format!(\"# TYPE {}\", name));\n let has_data = output.lines().any(|line| line.starts_with(name));\n assert!(\n has_metadata || has_data,\n \"missing core metric: {} (no HELP/TYPE metadata or data lines found)\\nOutput snippet:\\n{}\",\n name,\n output.lines().take(50).collect::>().join(\"\\n\")\n );\n }","originalFile":"//! P7.1 Core metrics families acceptance tests.\n//!\n//! Verifies that all plan §10 core metrics are properly registered and accessible.\n\nuse miroir_proxy::middleware::Metrics;\nuse miroir_core::config::MiroirConfig;\n\n#[test]\nfn test_all_core_metrics_registered() {\n let config = MiroirConfig::default();\n let metrics = Metrics::new(&config);\n\n // Add sample data to ensure metrics appear in output\n // Request metrics - recorded via telemetry_middleware in integration tests\n // Here we just verify the metrics are registered\n\n // Node metrics\n metrics.set_node_healthy(\"node-1\", true);\n metrics.record_node_request_duration(\"node-1\", \"search\", 0.05);\n metrics.inc_node_errors(\"node-1\", \"timeout\");\n\n // Shard metrics - use f64 for values\n metrics.set_shard_coverage(1.0);\n metrics.set_degraded_shards(0.0);\n metrics.set_shard_distribution(\"node-1\", 32.0);\n\n // Task metrics\n metrics.observe_task_processing_age(0.1);\n metrics.inc_tasks_total(\"completed\");\n metrics.set_task_registry_size(5.0);\n\n // Scatter-gather metrics\n metrics.record_scatter_fan_out(3);\n metrics.inc_scatter_partial_responses();\n metrics.inc_scatter_retries();\n\n // Rebalancer metrics\n metrics.set_rebalance_in_progress(false);\n metrics.inc_rebalance_documents_migrated(100);\n metrics.observe_rebalance_duration(10.0);\n\n let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n let output = encoded.as_str();\n\n // Verify all 18 core plan §10 metric names appear in the output\n let expected_metrics = [\n // Request metrics (3)\n \"miroir_request_duration_seconds\",\n \"miroir_requests_total\",\n \"miroir_requests_in_flight\",\n // Node health metrics (3)\n \"miroir_node_healthy\",\n \"miroir_node_request_duration_seconds\",\n \"miroir_node_errors_total\",\n // Shard metrics (3)\n \"miroir_shard_coverage\",\n \"miroir_degraded_shards_total\",\n \"miroir_shard_distribution\",\n // Task metrics (3)\n \"miroir_task_processing_age_seconds\",\n \"miroir_tasks_total\",\n \"miroir_task_registry_size\",\n // Scatter-gather metrics (3)\n \"miroir_scatter_fan_out_size\",\n \"miroir_scatter_partial_responses_total\",\n \"miroir_scatter_retries_total\",\n // Rebalancer metrics (3)\n \"miroir_rebalance_in_progress\",\n \"miroir_rebalance_documents_migrated_total\",\n \"miroir_rebalance_duration_seconds\",\n ];\n\n for name in &expected_metrics {\n assert!(\n output.contains(name),\n \"missing core metric: {}\",\n name\n );\n }\n}\n\n#[test]\nfn test_scatter_fan_out_metric_records_correctly() {\n let config = MiroirConfig::default();\n let metrics = Metrics::new(&config);\n\n // Record a scatter operation that hit 3 nodes\n metrics.record_scatter_fan_out(3);\n\n let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n let output = encoded.as_str();\n\n // Verify the metric is present\n assert!(\n output.contains(\"miroir_scatter_fan_out_size\"),\n \"miroir_scatter_fan_out_size metric not found\"\n );\n\n // Verify the sample value is recorded (histogram buckets should show a sample at 3.0)\n // Note: Prometheus histogram buckets use le=\"3.0\" format, not le=\"3\"\n assert!(\n output.contains(\"miroir_scatter_fan_out_size_bucket{le=\\\"3.0\\\"} 1\"),\n \"Expected histogram sample at bucket 3.0 not found. Output:\\n{}\",\n output\n );\n}\n\n#[test]\nfn test_node_health_metrics_have_correct_labels() {\n let config = MiroirConfig::default();\n let metrics = Metrics::new(&config);\n\n // Set node health for two nodes\n metrics.set_node_healthy(\"node-1\", true);\n metrics.set_node_healthy(\"node-2\", false);\n\n let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n let output = encoded.as_str();\n\n // Verify node_id label is present and values are correct\n assert!(\n output.contains(\"miroir_node_healthy\") &&\n output.contains(\"node-1\") &&\n output.contains(\" 1\"),\n \"Expected node-1 healthy metric not found. Output:\\n{}\",\n output\n );\n assert!(\n output.contains(\"miroir_node_healthy\") &&\n output.contains(\"node-2\") &&\n output.contains(\" 0\"),\n \"Expected node-2 unhealthy metric not found. Output:\\n{}\",\n output\n );\n}\n\n#[test]\nfn test_node_request_duration_has_operation_label() {\n let config = MiroirConfig::default();\n let metrics = Metrics::new(&config);\n\n // Record a node request duration\n metrics.record_node_request_duration(\"node-1\", \"search\", 0.05);\n\n let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n let output = encoded.as_str();\n\n // Verify operation label is present (format may vary: \"node-1\",\"search\" or node_id=\"node-1\",operation=\"search\")\n assert!(\n output.contains(\"miroir_node_request_duration_seconds\") &&\n output.contains(\"node-1\") &&\n output.contains(\"search\"),\n \"Expected node request duration metric with node_id and operation labels not found. Output:\\n{}\",\n output\n );\n}\n\n#[test]\nfn test_task_metrics_have_status_label() {\n let config = MiroirConfig::default();\n let metrics = Metrics::new(&config);\n\n // Increment task counters\n metrics.inc_tasks_total(\"completed\");\n metrics.inc_tasks_total(\"failed\");\n\n let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n let output = encoded.as_str();\n\n // Verify status label is present\n assert!(\n output.contains(\"miroir_tasks_total\") &&\n output.contains(\"completed\") &&\n output.contains(\"failed\"),\n \"Expected tasks_total metric with status labels not found. Output:\\n{}\",\n output\n );\n}\n","structuredPatch":[{"oldStart":43,"oldLines":6,"newStart":43,"newLines":7,"lines":[" let output = encoded.as_str();"," "," // Verify all 18 core plan §10 metric names appear in the output","+ // Check for either HELP, TYPE, or data lines for each metric"," let expected_metrics = ["," // Request metrics (3)"," \"miroir_request_duration_seconds\","]},{"oldStart":71,"oldLines":10,"newStart":72,"newLines":14,"lines":[" ];"," "," for name in &expected_metrics {","+ // Check for HELP or TYPE line (metadata) OR data line for the metric","+ let has_metadata = output.contains(&format!(\"# HELP {}\", name)) || output.contains(&format!(\"# TYPE {}\", name));","+ let has_data = output.lines().any(|line| line.starts_with(name));"," assert!(","- output.contains(name),","- \"missing core metric: {}\",","- name","+ has_metadata || has_data,","+ \"missing core metric: {} (no HELP/TYPE metadata or data lines found)\\nOutput snippet:\\n{}\",","+ name,","+ 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Verifies that all plan §10 core metrics are properly registered and accessible.\n\nuse miroir_proxy::middleware::Metrics;\nuse miroir_core::config::MiroirConfig;\n\n#[test]\nfn test_all_core_metrics_registered() {\n let config = MiroirConfig::default();\n let metrics = Metrics::new(&config);\n\n // Add sample data to ensure metrics appear in output\n // Request metrics - recorded via telemetry_middleware in integration tests\n // Here we just verify the metrics are registered\n\n // Node metrics\n metrics.set_node_healthy(\"node-1\", true);\n metrics.record_node_request_duration(\"node-1\", \"search\", 0.05);\n metrics.inc_node_errors(\"node-1\", \"timeout\");\n\n // Shard metrics - use f64 for values\n metrics.set_shard_coverage(1.0);\n metrics.set_degraded_shards(0.0);\n metrics.set_shard_distribution(\"node-1\", 32.0);\n\n // Task metrics\n metrics.observe_task_processing_age(0.1);\n metrics.inc_tasks_total(\"completed\");\n metrics.set_task_registry_size(5.0);\n\n // Scatter-gather metrics\n metrics.record_scatter_fan_out(3);\n metrics.inc_scatter_partial_responses();\n metrics.inc_scatter_retries();\n\n // Rebalancer metrics\n metrics.set_rebalance_in_progress(false);\n metrics.inc_rebalance_documents_migrated(100);\n metrics.observe_rebalance_duration(10.0);\n\n let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n let output = encoded.as_str();\n\n // Verify all 18 core plan §10 metric names appear in the output\n // Check for either HELP, TYPE, or data lines for each metric\n let expected_metrics = [\n // Request metrics (3)\n \"miroir_request_duration_seconds\",\n \"miroir_requests_total\",\n \"miroir_requests_in_flight\",\n // Node health metrics (3)\n \"miroir_node_healthy\",\n \"miroir_node_request_duration_seconds\",\n \"miroir_node_errors_total\",\n // Shard metrics (3)\n \"miroir_shard_coverage\",\n \"miroir_degraded_shards_total\",\n \"miroir_shard_distribution\",\n // Task metrics (3)\n \"miroir_task_processing_age_seconds\",\n \"miroir_tasks_total\",\n \"miroir_task_registry_size\",\n // Scatter-gather metrics (3)\n \"miroir_scatter_fan_out_size\",\n \"miroir_scatter_partial_responses_total\",\n \"miroir_scatter_retries_total\",\n // Rebalancer metrics (3)\n \"miroir_rebalance_in_progress\",\n \"miroir_rebalance_documents_migrated_total\",\n \"miroir_rebalance_duration_seconds\",\n ];\n\n for name in &expected_metrics {\n // Check for HELP or TYPE line (metadata) OR data line for the metric\n let has_metadata = output.contains(&format!(\"# HELP {}\", name)) || output.contains(&format!(\"# TYPE {}\", name));\n let has_data = output.lines().any(|line| line.starts_with(name));\n assert!(\n has_metadata || has_data,\n \"missing core metric: {} (no HELP/TYPE metadata or data lines found)\\nOutput snippet:\\n{}\",\n name,\n output.lines().take(50).collect::>().join(\"\\n\")\n );\n }\n}\n\n#[test]\nfn test_scatter_fan_out_metric_records_correctly() {\n let config = MiroirConfig::default();\n let metrics = Metrics::new(&config);\n\n // Record a scatter operation that hit 3 nodes\n metrics.record_scatter_fan_out(3);\n\n let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n let output = encoded.as_str();\n\n // Verify the metric is present\n assert!(\n output.contains(\"miroir_scatter_fan_out_size\"),\n \"miroir_scatter_fan_out_size metric not found\"\n );\n\n // Verify the sample value is recorded (histogram buckets should show a sample at 3.0)\n // Note: Prometheus histogram buckets use le=\"3.0\" format, not le=\"3\"\n assert!(\n output.contains(\"miroir_scatter_fan_out_size_bucket{le=\\\"3.0\\\"} 1\"),\n \"Expected histogram sample at bucket 3.0 not found. Output:\\n{}\",\n output\n );\n}\n\n#[test]\nfn test_node_health_metrics_have_correct_labels() {\n let config = MiroirConfig::default();\n let metrics = Metrics::new(&config);\n\n // Set node health for two nodes\n metrics.set_node_healthy(\"node-1\", true);\n metrics.set_node_healthy(\"node-2\", false);\n\n let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n let output = encoded.as_str();\n\n // Verify node_id label is present and values are correct\n assert!(\n output.contains(\"miroir_node_healthy\") &&\n output.contains(\"node-1\") &&\n output.contains(\" 1\"),\n \"Expected node-1 healthy metric not found. Output:\\n{}\",\n output\n );\n assert!(\n output.contains(\"miroir_node_healthy\") &&\n output.contains(\"node-2\") &&\n output.contains(\" 0\"),\n \"Expected node-2 unhealthy metric not found. Output:\\n{}\",\n output\n );\n}\n\n#[test]\nfn test_node_request_duration_has_operation_label() {\n let config = MiroirConfig::default();\n let metrics = Metrics::new(&config);\n\n // Record a node request duration\n metrics.record_node_request_duration(\"node-1\", \"search\", 0.05);\n\n let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n let output = encoded.as_str();\n\n // Verify operation label is present (format may vary: \"node-1\",\"search\" or node_id=\"node-1\",operation=\"search\")\n assert!(\n output.contains(\"miroir_node_request_duration_seconds\") &&\n output.contains(\"node-1\") &&\n output.contains(\"search\"),\n \"Expected node request duration metric with node_id and operation labels not found. 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(file state is current in your context — no need to Read it back)"}]},"parent_tool_use_id":null,"session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","uuid":"f26def88-fd8c-4881-9287-b0c5f2302e9e","timestamp":"2026-05-23T06:27:04.841Z","tool_use_result":{"filePath":"/home/coding/miroir/crates/miroir-proxy/src/middleware.rs","oldString":"/// Accessor methods for metrics that can be used by other parts of the application.\nimpl Metrics {\n // ── Scatter-gather ──","newString":"/// Accessor methods for metrics that can be used by other parts of the application.\nimpl Metrics {\n // ── Request metrics ──\n\n pub fn record_request_duration(&self, method: &str, path_template: &str, status: u16, duration_secs: f64) {\n self.request_duration.with_label_values(&[method, path_template, &status.to_string()]).observe(duration_secs);\n }\n\n pub fn inc_requests_total(&self, method: &str, path_template: &str, status: u16) {\n self.requests_total.with_label_values(&[method, path_template, &status.to_string()]).inc();\n }\n\n // ── Scatter-gather ──","originalFile":"//! Structured logging, request IDs, and Prometheus metrics middleware.\n\nuse std::time::Instant;\n\nuse axum::{\n extract::{Request, State},\n http::{HeaderMap, HeaderValue},\n middleware::Next,\n response::Response,\n Router,\n routing::get,\n};\nuse miroir_core::config::MiroirConfig;\nuse prometheus::{\n Counter, CounterVec, Encoder, Gauge, GaugeVec, Histogram, HistogramOpts, HistogramVec, Opts,\n Registry, TextEncoder,\n};\nuse tracing::info_span;\nuse uuid::Uuid;\nuse hex;\nuse std::collections::hash_map::DefaultHasher;\nuse std::hash::{Hash, Hasher};\n\n/// Request ID wrapper type for storing in axum Request extensions.\n///\n/// This is a newtype wrapper around the 8-character hex request ID,\n/// allowing handlers to extract it via `Request.extensions().get::()`.\n#[derive(Clone, Debug, PartialEq, Eq, Hash)]\npub struct RequestId(pub String);\n\nimpl RequestId {\n /// Create a new RequestId from a UUIDv7.\n ///\n /// Hashes the full UUIDv7 to produce an 8-character hex ID that is unique\n /// even for consecutive calls within the same millisecond.\n pub fn new() -> Self {\n let uuid = Uuid::now_v7();\n let bytes = uuid.as_bytes();\n // Hash the full UUID to ensure uniqueness even within the same millisecond\n let mut hasher = DefaultHasher::new();\n hasher.write(bytes);\n let hash = hasher.finish();\n // Take first 8 hex chars of 64-bit hash (32 bits is sufficient entropy)\n Self(format!(\"{:08x}\", hash as u32))\n }\n\n /// Get the inner request ID string.\n pub fn as_str(&self) -> &str {\n &self.0\n }\n\n /// Parse a RequestId from a string.\n pub fn parse(s: String) -> Option {\n if s.len() == 8 && s.chars().all(|c| c.is_ascii_hexdigit()) {\n Some(Self(s))\n } else {\n None\n }\n }\n}\n\n/// Session ID wrapper type for read-your-writes session pinning (plan §13.6).\n///\n/// Extracted from the `X-Miroir-Session` header and stored in request extensions.\n/// Handlers can access it via `Request.extensions().get::()`.\n#[derive(Clone, Debug, PartialEq, Eq, Hash)]\npub struct SessionId(pub String);\n\nimpl Default for SessionId {\n fn default() -> Self {\n Self(String::new())\n }\n}\n\nimpl SessionId {\n /// Get the inner session ID string.\n pub fn as_str(&self) -> &str {\n &self.0\n }\n\n /// Parse a SessionId from a string.\n ///\n /// Accepts any non-empty string (client-provided UUID or identifier).\n pub fn parse(s: String) -> Option {\n if !s.is_empty() && s.len() <= 256 {\n Some(Self(s))\n } else {\n None\n }\n }\n}\n\npub async fn request_id_middleware(\n mut req: Request,\n next: Next,\n) -> Response {\n // Check for existing request ID in headers\n let request_id = req\n .headers()\n .get(\"x-request-id\")\n .and_then(|v| v.to_str().ok())\n .and_then(|s| RequestId::parse(s.to_string()))\n .unwrap_or_else(RequestId::new);\n\n // Store in request extensions for handler access\n req.extensions_mut().insert(request_id.clone());\n\n // Set X-Request-Id header on request (for telemetry_middleware to read)\n if let Ok(val) = HeaderValue::from_str(request_id.as_str()) {\n req.headers_mut().insert(\"x-request-id\", val);\n }\n\n // Process the request\n let mut response = next.run(req).await;\n\n // Add X-Request-Id header to response (override if exists)\n if let Ok(val) = HeaderValue::from_str(request_id.as_str()) {\n response.headers_mut().insert(\"x-request-id\", val);\n }\n\n response\n}\n\n/// Session pinning middleware (plan §13.6).\n///\n/// Extracts the `X-Miroir-Session` header and stores it in request extensions\n/// for handlers to access via `Request.extensions().get::()`.\npub async fn session_pinning_middleware(\n mut req: Request,\n next: Next,\n) -> Response {\n // Extract session ID from header if present\n let session_id = req\n .headers()\n .get(\"x-miroir-session\")\n .and_then(|v| v.to_str().ok())\n .and_then(|s| SessionId::parse(s.to_string()));\n\n // Store in request extensions for handler access\n if let Some(sid) = session_id {\n req.extensions_mut().insert(sid);\n }\n\n next.run(req).await\n}\n\n\n/// Telemetry state combining metrics and pod_id for middleware.\n#[derive(Clone)]\npub struct TelemetryState {\n pub metrics: Metrics,\n pub pod_id: String,\n}\n\nimpl TelemetryState {\n pub fn new(metrics: Metrics) -> Self {\n let pod_id = std::env::var(\"POD_NAME\").unwrap_or_else(|_| \"unknown\".to_string());\n Self { metrics, pod_id }\n }\n}\n\n/// Global metrics registry shared across all middleware instances.\npub struct Metrics {\n registry: Registry,\n\n // ── Request metrics ──\n request_duration: HistogramVec,\n requests_total: CounterVec,\n requests_in_flight: Gauge,\n\n // ── Node health metrics ──\n node_healthy: GaugeVec,\n node_request_duration: HistogramVec,\n node_errors: CounterVec,\n\n // ── Shard metrics ──\n shard_coverage: Gauge,\n degraded_shards: Gauge,\n shard_distribution: GaugeVec,\n\n // ── Task metrics ──\n task_processing_age: Histogram,\n tasks_total: CounterVec,\n task_registry_size: Gauge,\n\n // ── Scatter-gather metrics ──\n scatter_fan_out_size: Histogram,\n scatter_partial_responses: Counter,\n scatter_retries: Counter,\n\n // ── Rebalancer metrics ──\n rebalance_in_progress: Gauge,\n rebalance_documents_migrated: Counter,\n rebalance_duration: Histogram,\n\n // ── §13.11 Multi-search metrics (feature-gated) ──\n multisearch_queries_per_batch: Option,\n multisearch_batches_total: Option,\n multisearch_partial_failures_total: Option,\n multisearch_tenant_session_pin_override_total: Option,\n\n // ── §13.12 Vector search metrics (feature-gated) ──\n vector_search_over_fetched_total: Option,\n vector_merge_strategy: Option,\n vector_embedder_drift_total: Option,\n\n // ── §13.13 CDC metrics (feature-gated) ──\n cdc_events_published_total: Option,\n cdc_lag_seconds: Option,\n cdc_buffer_bytes: Option,\n cdc_dropped_total: Option,\n cdc_events_suppressed_total: Option,\n\n // ── §13.14 TTL metrics (feature-gated) ──\n ttl_documents_expired_total: Option,\n ttl_sweep_duration_seconds: Option,\n ttl_pending_estimate: Option,\n\n // ── §13.15 Tenant affinity metrics (feature-gated) ──\n tenant_queries_total: Option,\n tenant_pinned_groups: Option,\n tenant_fallback_total: Option,\n\n // ── §13.16 Shadow traffic metrics (feature-gated) ──\n shadow_diff_total: Option,\n shadow_kendall_tau: Option,\n shadow_latency_delta_seconds: Option,\n shadow_errors_total: Option,\n\n // ── §13.17 ILM metrics (feature-gated) ──\n rollover_events_total: Option,\n rollover_active_indexes: Option,\n rollover_documents_expired_total: Option,\n rollover_last_action_seconds: Option,\n\n // ── §13.18 Canary metrics (feature-gated) ──\n canary_runs_total: Option,\n canary_latency_ms: Option,\n canary_assertion_failures_total: Option,\n\n // ── §13.19 Admin UI metrics (feature-gated) ──\n admin_ui_sessions_total: Option,\n admin_ui_action_total: Option,\n admin_ui_destructive_action_total: Option,\n\n // ── §13.20 Explain metrics (feature-gated) ──\n explain_requests_total: Option,\n explain_warnings_total: Option,\n explain_execute_total: Option,\n\n // ── §13.21 Search UI metrics (feature-gated) ──\n search_ui_sessions_total: Option,\n search_ui_queries_total: Option,\n search_ui_zero_hits_total: Option,\n search_ui_click_through_total: Option,\n search_ui_p95_ms: Option,\n\n // ── §14.9 Resource-pressure metrics (always present) ──\n memory_pressure: Gauge,\n cpu_throttled_seconds_total: Counter,\n request_queue_depth: Gauge,\n background_queue_depth: GaugeVec,\n peer_pod_count: Gauge,\n leader: Gauge,\n owned_shards_count: Gauge,\n\n // ── Admin session sealing metrics (always present) ──\n admin_session_key_generated: Gauge,\n admin_session_revoked_total: Counter,\n\n // ── §13.5 Two-phase settings broadcast metrics (always present) ──\n settings_broadcast_phase: GaugeVec,\n settings_hash_mismatch_total: Counter,\n settings_drift_repair_total: CounterVec,\n settings_version: GaugeVec,\n\n // ── §13.7 Alias metrics (always present) ──\n alias_resolutions_total: CounterVec,\n alias_flips_total: CounterVec,\n\n // ── §13.6 Session pinning metrics (always present) ──\n session_active_count: Gauge,\n session_pin_enforced_total: CounterVec,\n session_wait_duration_seconds: Histogram,\n session_wait_timeout_total: CounterVec,\n}\n\nimpl Clone for Metrics {\n fn clone(&self) -> Self {\n Self {\n registry: self.registry.clone(),\n request_duration: self.request_duration.clone(),\n requests_total: self.requests_total.clone(),\n requests_in_flight: self.requests_in_flight.clone(),\n node_healthy: self.node_healthy.clone(),\n node_request_duration: self.node_request_duration.clone(),\n node_errors: self.node_errors.clone(),\n shard_coverage: self.shard_coverage.clone(),\n degraded_shards: self.degraded_shards.clone(),\n shard_distribution: self.shard_distribution.clone(),\n task_processing_age: self.task_processing_age.clone(),\n tasks_total: self.tasks_total.clone(),\n task_registry_size: self.task_registry_size.clone(),\n scatter_fan_out_size: self.scatter_fan_out_size.clone(),\n scatter_partial_responses: self.scatter_partial_responses.clone(),\n scatter_retries: self.scatter_retries.clone(),\n rebalance_in_progress: self.rebalance_in_progress.clone(),\n rebalance_documents_migrated: self.rebalance_documents_migrated.clone(),\n rebalance_duration: self.rebalance_duration.clone(),\n multisearch_queries_per_batch: self.multisearch_queries_per_batch.clone(),\n multisearch_batches_total: self.multisearch_batches_total.clone(),\n multisearch_partial_failures_total: self.multisearch_partial_failures_total.clone(),\n multisearch_tenant_session_pin_override_total: self.multisearch_tenant_session_pin_override_total.clone(),\n vector_search_over_fetched_total: self.vector_search_over_fetched_total.clone(),\n vector_merge_strategy: self.vector_merge_strategy.clone(),\n vector_embedder_drift_total: self.vector_embedder_drift_total.clone(),\n cdc_events_published_total: self.cdc_events_published_total.clone(),\n cdc_lag_seconds: self.cdc_lag_seconds.clone(),\n cdc_buffer_bytes: self.cdc_buffer_bytes.clone(),\n cdc_dropped_total: self.cdc_dropped_total.clone(),\n cdc_events_suppressed_total: self.cdc_events_suppressed_total.clone(),\n ttl_documents_expired_total: self.ttl_documents_expired_total.clone(),\n ttl_sweep_duration_seconds: self.ttl_sweep_duration_seconds.clone(),\n ttl_pending_estimate: self.ttl_pending_estimate.clone(),\n tenant_queries_total: self.tenant_queries_total.clone(),\n tenant_pinned_groups: self.tenant_pinned_groups.clone(),\n tenant_fallback_total: self.tenant_fallback_total.clone(),\n shadow_diff_total: self.shadow_diff_total.clone(),\n shadow_kendall_tau: self.shadow_kendall_tau.clone(),\n shadow_latency_delta_seconds: self.shadow_latency_delta_seconds.clone(),\n shadow_errors_total: self.shadow_errors_total.clone(),\n rollover_events_total: self.rollover_events_total.clone(),\n rollover_active_indexes: self.rollover_active_indexes.clone(),\n rollover_documents_expired_total: self.rollover_documents_expired_total.clone(),\n rollover_last_action_seconds: self.rollover_last_action_seconds.clone(),\n canary_runs_total: self.canary_runs_total.clone(),\n canary_latency_ms: self.canary_latency_ms.clone(),\n canary_assertion_failures_total: self.canary_assertion_failures_total.clone(),\n admin_ui_sessions_total: self.admin_ui_sessions_total.clone(),\n admin_ui_action_total: self.admin_ui_action_total.clone(),\n admin_ui_destructive_action_total: self.admin_ui_destructive_action_total.clone(),\n explain_requests_total: self.explain_requests_total.clone(),\n explain_warnings_total: self.explain_warnings_total.clone(),\n explain_execute_total: self.explain_execute_total.clone(),\n search_ui_sessions_total: self.search_ui_sessions_total.clone(),\n search_ui_queries_total: self.search_ui_queries_total.clone(),\n search_ui_zero_hits_total: self.search_ui_zero_hits_total.clone(),\n search_ui_click_through_total: self.search_ui_click_through_total.clone(),\n search_ui_p95_ms: self.search_ui_p95_ms.clone(),\n memory_pressure: self.memory_pressure.clone(),\n cpu_throttled_seconds_total: self.cpu_throttled_seconds_total.clone(),\n request_queue_depth: self.request_queue_depth.clone(),\n background_queue_depth: self.background_queue_depth.clone(),\n peer_pod_count: self.peer_pod_count.clone(),\n leader: self.leader.clone(),\n owned_shards_count: self.owned_shards_count.clone(),\n admin_session_key_generated: self.admin_session_key_generated.clone(),\n admin_session_revoked_total: self.admin_session_revoked_total.clone(),\n settings_broadcast_phase: self.settings_broadcast_phase.clone(),\n settings_hash_mismatch_total: self.settings_hash_mismatch_total.clone(),\n settings_drift_repair_total: self.settings_drift_repair_total.clone(),\n settings_version: self.settings_version.clone(),\n alias_resolutions_total: self.alias_resolutions_total.clone(),\n alias_flips_total: self.alias_flips_total.clone(),\n session_active_count: self.session_active_count.clone(),\n session_pin_enforced_total: self.session_pin_enforced_total.clone(),\n session_wait_duration_seconds: self.session_wait_duration_seconds.clone(),\n session_wait_timeout_total: self.session_wait_timeout_total.clone(),\n }\n }\n}\n\nimpl Default for Metrics {\n fn default() -> Self {\n Self::new(&MiroirConfig::default())\n }\n}\n\nimpl Metrics {\n pub fn new(config: &MiroirConfig) -> Self {\n let registry = Registry::new();\n\n // ── Request metrics ──\n let request_duration = HistogramVec::new(\n HistogramOpts::new(\"miroir_request_duration_seconds\", \"Request latency in seconds\")\n .buckets(vec![0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0, 10.0]),\n &[\"method\", \"path_template\", \"status\"],\n )\n .expect(\"failed to create request_duration histogram\");\n\n let requests_total = CounterVec::new(\n Opts::new(\"miroir_requests_total\", \"Total number of requests\"),\n &[\"method\", \"path_template\", \"status\"],\n )\n .expect(\"failed to create requests_total counter\");\n\n let requests_in_flight = Gauge::with_opts(\n Opts::new(\"miroir_requests_in_flight\", \"Number of requests currently being processed\"),\n )\n .expect(\"failed to create requests_in_flight gauge\");\n\n // ── Node health metrics ──\n let node_healthy = GaugeVec::new(\n Opts::new(\"miroir_node_healthy\", \"Health status of backend nodes (1=healthy, 0=unhealthy)\"),\n &[\"node_id\"],\n )\n .expect(\"failed to create node_healthy gauge\");\n\n let node_request_duration = HistogramVec::new(\n HistogramOpts::new(\"miroir_node_request_duration_seconds\", \"Latency of individual node requests\")\n .buckets(vec![0.001, 0.005, 0.01, 0.025, 0.05, 0.1, 0.5, 1.0]),\n &[\"node_id\", \"operation\"],\n )\n .expect(\"failed to create node_request_duration histogram\");\n\n let node_errors = CounterVec::new(\n Opts::new(\"miroir_node_errors_total\", \"Number of errors from backend nodes\"),\n &[\"node_id\", \"error_type\"],\n )\n .expect(\"failed to create node_errors counter\");\n\n // ── Shard metrics ──\n let shard_coverage = Gauge::with_opts(\n Opts::new(\"miroir_shard_coverage\", \"Fraction of shards with at least one healthy replica\"),\n )\n .expect(\"failed to create shard_coverage gauge\");\n\n let degraded_shards = Gauge::with_opts(\n Opts::new(\"miroir_degraded_shards_total\", \"Number of shards with reduced replica availability\"),\n )\n .expect(\"failed to create degraded_shards gauge\");\n\n let shard_distribution = GaugeVec::new(\n Opts::new(\"miroir_shard_distribution\", \"Number of shards assigned to each node\"),\n &[\"node_id\"],\n )\n .expect(\"failed to create shard_distribution gauge\");\n\n // ── Task metrics ──\n let task_processing_age = Histogram::with_opts(\n HistogramOpts::new(\"miroir_task_processing_age_seconds\", \"Time between task creation and processing start\")\n .buckets(vec![0.01, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0, 10.0, 30.0, 60.0]),\n )\n .expect(\"failed to create task_processing_age histogram\");\n\n let tasks_total = CounterVec::new(\n Opts::new(\"miroir_tasks_total\", \"Total number of tasks by status\"),\n &[\"status\"],\n )\n .expect(\"failed to create tasks_total counter\");\n\n let task_registry_size = Gauge::with_opts(\n Opts::new(\"miroir_task_registry_size\", \"Current number of tasks in the registry\"),\n )\n .expect(\"failed to create task_registry_size gauge\");\n\n // ── Scatter-gather metrics ──\n let scatter_fan_out_size = Histogram::with_opts(\n HistogramOpts::new(\"miroir_scatter_fan_out_size\", \"Number of nodes in scatter operations\")\n .buckets(vec![1.0, 2.0, 3.0, 5.0, 10.0, 20.0, 50.0]),\n )\n .expect(\"failed to create scatter_fan_out_size histogram\");\n\n let scatter_partial_responses = Counter::with_opts(\n Opts::new(\"miroir_scatter_partial_responses_total\", \"Number of scatter responses that were partial (some nodes failed)\"),\n )\n .expect(\"failed to create scatter_partial_responses counter\");\n\n let scatter_retries = Counter::with_opts(\n Opts::new(\"miroir_scatter_retries_total\", \"Number of scatter retry attempts due to node failures\"),\n )\n .expect(\"failed to create scatter_retries counter\");\n\n // ── Rebalancer metrics ──\n let rebalance_in_progress = Gauge::with_opts(\n Opts::new(\"miroir_rebalance_in_progress\", \"Whether a rebalance is currently running (1=yes, 0=no)\"),\n )\n .expect(\"failed to create rebalance_in_progress gauge\");\n\n let rebalance_documents_migrated = Counter::with_opts(\n Opts::new(\"miroir_rebalance_documents_migrated_total\", \"Total number of documents migrated during rebalance\"),\n )\n .expect(\"failed to create rebalance_documents_migrated counter\");\n\n let rebalance_duration = Histogram::with_opts(\n HistogramOpts::new(\"miroir_rebalance_duration_seconds\", \"Duration of rebalance operations\")\n .buckets(vec![1.0, 5.0, 10.0, 30.0, 60.0, 300.0, 600.0, 1800.0, 3600.0]),\n )\n .expect(\"failed to create rebalance_duration histogram\");\n\n // Register all metrics\n macro_rules! reg {\n ($m:expr) => {\n registry.register(Box::new($m.clone())).expect(concat!(\"failed to register \", stringify!($m)));\n };\n }\n\n reg!(request_duration);\n reg!(requests_total);\n reg!(requests_in_flight);\n reg!(node_healthy);\n reg!(node_request_duration);\n reg!(node_errors);\n reg!(shard_coverage);\n reg!(degraded_shards);\n reg!(shard_distribution);\n reg!(task_processing_age);\n reg!(tasks_total);\n reg!(task_registry_size);\n reg!(scatter_fan_out_size);\n reg!(scatter_partial_responses);\n reg!(scatter_retries);\n reg!(rebalance_in_progress);\n reg!(rebalance_documents_migrated);\n reg!(rebalance_duration);\n\n // ── §13.11 Multi-search metrics (cardinality cap: top 100 tenants, rest bucketed) ──\n let (\n multisearch_queries_per_batch,\n multisearch_batches_total,\n multisearch_partial_failures_total,\n multisearch_tenant_session_pin_override_total,\n ) = if config.multi_search.enabled {\n let q = Histogram::with_opts(\n HistogramOpts::new(\"miroir_multisearch_queries_per_batch\", \"Number of queries in each multi-search batch\")\n .buckets(vec![1.0, 2.0, 5.0, 10.0, 25.0, 50.0, 100.0]),\n ).expect(\"create multisearch_queries_per_batch\");\n let b = Counter::with_opts(\n Opts::new(\"miroir_multisearch_batches_total\", \"Total number of multi-search batches processed\"),\n ).expect(\"create multisearch_batches_total\");\n let p = Counter::with_opts(\n Opts::new(\"miroir_multisearch_partial_failures_total\", \"Number of multi-search batches with at least one query failure\"),\n ).expect(\"create multisearch_partial_failures_total\");\n let t = CounterVec::new(\n Opts::new(\"miroir_tenant_session_pin_override_total\", \"Session pin overrides triggered by multi-search tenant routing\"),\n &[\"tenant\"],\n ).expect(\"create multisearch_tenant_session_pin_override_total\");\n reg!(q); reg!(b); reg!(p); reg!(t);\n (Some(q), Some(b), Some(p), Some(t))\n } else {\n (None, None, None, None)\n };\n\n // ── §13.12 Vector search metrics ──\n let (\n vector_search_over_fetched_total,\n vector_merge_strategy,\n vector_embedder_drift_total,\n ) = if config.vector_search.enabled {\n let o = Counter::with_opts(\n Opts::new(\"miroir_vector_search_over_fetched_total\", \"Number of vector searches that over-fetched candidates\"),\n ).expect(\"create vector_search_over_fetched_total\");\n let m = CounterVec::new(\n Opts::new(\"miroir_vector_merge_strategy\", \"Count of hybrid merge strategy selections\"),\n &[\"strategy\"],\n ).expect(\"create vector_merge_strategy\");\n let d = Counter::with_opts(\n Opts::new(\"miroir_vector_embedder_drift_total\", \"Number of embedder drift detections\"),\n ).expect(\"create vector_embedder_drift_total\");\n reg!(o); reg!(m); reg!(d);\n (Some(o), Some(m), Some(d))\n } else {\n (None, None, None)\n };\n\n // ── §13.13 CDC metrics (cardinality cap: top 100 sinks, rest bucketed) ──\n let (\n cdc_events_published_total,\n cdc_lag_seconds,\n cdc_buffer_bytes,\n cdc_dropped_total,\n cdc_events_suppressed_total,\n ) = if config.cdc.enabled {\n let e = CounterVec::new(\n Opts::new(\"miroir_cdc_events_published_total\", \"Total CDC events published\"),\n &[\"sink\", \"index\"],\n ).expect(\"create cdc_events_published_total\");\n let l = GaugeVec::new(\n Opts::new(\"miroir_cdc_lag_seconds\", \"CDC delivery lag in seconds\"),\n &[\"sink\"],\n ).expect(\"create cdc_lag_seconds\");\n let b = GaugeVec::new(\n Opts::new(\"miroir_cdc_buffer_bytes\", \"CDC buffer size in bytes\"),\n &[\"sink\"],\n ).expect(\"create cdc_buffer_bytes\");\n let d = CounterVec::new(\n Opts::new(\"miroir_cdc_dropped_total\", \"CDC events dropped due to buffer overflow\"),\n &[\"sink\"],\n ).expect(\"create cdc_dropped_total\");\n let s = CounterVec::new(\n Opts::new(\"miroir_cdc_events_suppressed_total\", \"CDC events suppressed by origin deduplication\"),\n &[\"origin\"],\n ).expect(\"create cdc_events_suppressed_total\");\n reg!(e); reg!(l); reg!(b); reg!(d); reg!(s);\n (Some(e), Some(l), Some(b), Some(d), Some(s))\n } else {\n (None, None, None, None, None)\n };\n\n // ── §13.14 TTL metrics (cardinality cap: top 100 indexes, rest bucketed) ──\n let (\n ttl_documents_expired_total,\n ttl_sweep_duration_seconds,\n ttl_pending_estimate,\n ) = if config.ttl.enabled {\n let e = CounterVec::new(\n Opts::new(\"miroir_ttl_documents_expired_total\", \"Documents expired by TTL sweeper\"),\n &[\"index\"],\n ).expect(\"create ttl_documents_expired_total\");\n let d = HistogramVec::new(\n HistogramOpts::new(\"miroir_ttl_sweep_duration_seconds\", \"Duration of TTL sweep cycles\")\n .buckets(vec![0.01, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0, 10.0]),\n &[\"index\"],\n ).expect(\"create ttl_sweep_duration_seconds\");\n let p = GaugeVec::new(\n Opts::new(\"miroir_ttl_pending_estimate\", \"Estimated documents pending TTL expiry\"),\n &[\"index\"],\n ).expect(\"create ttl_pending_estimate\");\n reg!(e); reg!(d); reg!(p);\n (Some(e), Some(d), Some(p))\n } else {\n (None, None, None)\n };\n\n // ── §13.15 Tenant affinity metrics (cardinality cap: top 100 tenants, rest bucketed) ──\n let (\n tenant_queries_total,\n tenant_pinned_groups,\n tenant_fallback_total,\n ) = if config.tenant_affinity.enabled {\n let q = CounterVec::new(\n Opts::new(\"miroir_tenant_queries_total\", \"Queries routed per tenant and group\"),\n &[\"tenant\", \"group\"],\n ).expect(\"create tenant_queries_total\");\n let p = GaugeVec::new(\n Opts::new(\"miroir_tenant_pinned_groups\", \"Current pinned group per tenant\"),\n &[\"tenant\"],\n ).expect(\"create tenant_pinned_groups\");\n let f = CounterVec::new(\n Opts::new(\"miroir_tenant_fallback_total\", \"Tenant affinity fallback invocations\"),\n &[\"reason\"],\n ).expect(\"create tenant_fallback_total\");\n reg!(q); reg!(p); reg!(f);\n (Some(q), Some(p), Some(f))\n } else {\n (None, None, None)\n };\n\n // ── §13.16 Shadow traffic metrics ──\n let (\n shadow_diff_total,\n shadow_kendall_tau,\n shadow_latency_delta_seconds,\n shadow_errors_total,\n ) = if config.shadow.enabled {\n let d = CounterVec::new(\n Opts::new(\"miroir_shadow_diff_total\", \"Shadow comparison diffs by kind\"),\n &[\"kind\"],\n ).expect(\"create shadow_diff_total\");\n let k = Gauge::with_opts(\n Opts::new(\"miroir_shadow_kendall_tau\", \"Kendall tau rank correlation between shadow and primary\"),\n ).expect(\"create shadow_kendall_tau\");\n let l = Histogram::with_opts(\n HistogramOpts::new(\"miroir_shadow_latency_delta_seconds\", \"Latency difference between shadow and primary\")\n .buckets(vec![-1.0, -0.5, -0.1, -0.01, 0.0, 0.01, 0.1, 0.5, 1.0]),\n ).expect(\"create shadow_latency_delta_seconds\");\n let e = CounterVec::new(\n Opts::new(\"miroir_shadow_errors_total\", \"Shadow pipeline errors\"),\n &[\"target\", \"side\"],\n ).expect(\"create shadow_errors_total\");\n reg!(d); reg!(k); reg!(l); reg!(e);\n (Some(d), Some(k), Some(l), Some(e))\n } else {\n (None, None, None, None)\n };\n\n // ── §13.17 ILM metrics (cardinality cap: top 100 policies/aliases, rest bucketed) ──\n let (\n rollover_events_total,\n rollover_active_indexes,\n rollover_documents_expired_total,\n rollover_last_action_seconds,\n ) = if config.ilm.enabled {\n let e = CounterVec::new(\n Opts::new(\"miroir_rollover_events_total\", \"ILM rollover events\"),\n &[\"policy\"],\n ).expect(\"create rollover_events_total\");\n let a = GaugeVec::new(\n Opts::new(\"miroir_rollover_active_indexes\", \"Active write indexes per alias\"),\n &[\"alias\"],\n ).expect(\"create rollover_active_indexes\");\n let d = CounterVec::new(\n Opts::new(\"miroir_rollover_documents_expired_total\", \"Documents expired by ILM retention policies\"),\n &[\"policy\"],\n ).expect(\"create rollover_documents_expired_total\");\n let l = GaugeVec::new(\n Opts::new(\"miroir_rollover_last_action_seconds\", \"Seconds since last rollover action per policy\"),\n &[\"policy\"],\n ).expect(\"create rollover_last_action_seconds\");\n reg!(e); reg!(a); reg!(d); reg!(l);\n (Some(e), Some(a), Some(d), Some(l))\n } else {\n (None, None, None, None)\n };\n\n // ── §13.18 Canary metrics (cardinality cap: top 100 canaries, rest bucketed) ──\n let (\n canary_runs_total,\n canary_latency_ms,\n canary_assertion_failures_total,\n ) = if config.canary_runner.enabled {\n let r = CounterVec::new(\n Opts::new(\"miroir_canary_runs_total\", \"Canary run results\"),\n &[\"canary\", \"result\"],\n ).expect(\"create canary_runs_total\");\n let l = HistogramVec::new(\n HistogramOpts::new(\"miroir_canary_latency_ms\", \"Canary execution latency\")\n .buckets(vec![1.0, 5.0, 10.0, 25.0, 50.0, 100.0, 250.0, 500.0, 1000.0]),\n &[\"canary\"],\n ).expect(\"create canary_latency_ms\");\n let a = CounterVec::new(\n Opts::new(\"miroir_canary_assertion_failures_total\", \"Canary assertion failures\"),\n &[\"canary\", \"assertion_type\"],\n ).expect(\"create canary_assertion_failures_total\");\n reg!(r); reg!(l); reg!(a);\n (Some(r), Some(l), Some(a))\n } else {\n (None, None, None)\n };\n\n // ── §13.19 Admin UI metrics ──\n let (\n admin_ui_sessions_total,\n admin_ui_action_total,\n admin_ui_destructive_action_total,\n ) = if config.admin_ui.enabled {\n let s = Counter::with_opts(\n Opts::new(\"miroir_admin_ui_sessions_total\", \"Admin UI sessions started\"),\n ).expect(\"create admin_ui_sessions_total\");\n let a = CounterVec::new(\n Opts::new(\"miroir_admin_ui_action_total\", \"Admin UI actions by type\"),\n &[\"action\"],\n ).expect(\"create admin_ui_action_total\");\n let d = CounterVec::new(\n Opts::new(\"miroir_admin_ui_destructive_action_total\", \"Admin UI destructive actions (delete, drop, etc.)\"),\n &[\"action\"],\n ).expect(\"create admin_ui_destructive_action_total\");\n reg!(s); reg!(a); reg!(d);\n (Some(s), Some(a), Some(d))\n } else {\n (None, None, None)\n };\n\n // ── §13.20 Explain metrics ──\n let (\n explain_requests_total,\n explain_warnings_total,\n explain_execute_total,\n ) = if config.explain.enabled {\n let r = Counter::with_opts(\n Opts::new(\"miroir_explain_requests_total\", \"Explain API requests\"),\n ).expect(\"create explain_requests_total\");\n let w = CounterVec::new(\n Opts::new(\"miroir_explain_warnings_total\", \"Explain warnings by type\"),\n &[\"warning_type\"],\n ).expect(\"create explain_warnings_total\");\n let e = Counter::with_opts(\n Opts::new(\"miroir_explain_execute_total\", \"Explain requests with execute=true\"),\n ).expect(\"create explain_execute_total\");\n reg!(r); reg!(w); reg!(e);\n (Some(r), Some(w), Some(e))\n } else {\n (None, None, None)\n };\n\n // ── §13.21 Search UI metrics (cardinality cap: top 100 indexes, rest bucketed) ──\n let (\n search_ui_sessions_total,\n search_ui_queries_total,\n search_ui_zero_hits_total,\n search_ui_click_through_total,\n search_ui_p95_ms,\n ) = if config.search_ui.enabled {\n let s = Counter::with_opts(\n Opts::new(\"miroir_search_ui_sessions_total\", \"Search UI sessions\"),\n ).expect(\"create search_ui_sessions_total\");\n let q = CounterVec::new(\n Opts::new(\"miroir_search_ui_queries_total\", \"Search UI queries per index\"),\n &[\"index\"],\n ).expect(\"create search_ui_queries_total\");\n let z = CounterVec::new(\n Opts::new(\"miroir_search_ui_zero_hits_total\", \"Search UI zero-hit queries per index\"),\n &[\"index\"],\n ).expect(\"create search_ui_zero_hits_total\");\n let c = CounterVec::new(\n Opts::new(\"miroir_search_ui_click_through_total\", \"Search UI click-through events per index\"),\n &[\"index\"],\n ).expect(\"create search_ui_click_through_total\");\n let p = GaugeVec::new(\n Opts::new(\"miroir_search_ui_p95_ms\", \"Search UI p95 query latency per index\"),\n &[\"index\"],\n ).expect(\"create search_ui_p95_ms\");\n reg!(s); reg!(q); reg!(z); reg!(c); reg!(p);\n (Some(s), Some(q), Some(z), Some(c), Some(p))\n } else {\n (None, None, None, None, None)\n };\n\n // ── §14.9 Resource-pressure metrics (always present) ──\n let memory_pressure = Gauge::with_opts(\n Opts::new(\"miroir_memory_pressure\", \"Memory pressure level (0=none, 1=low, 2=moderate/high)\")\n ).expect(\"create memory_pressure\");\n let cpu_throttled_seconds_total = Counter::with_opts(\n Opts::new(\"miroir_cpu_throttled_seconds_total\", \"Total seconds of CPU throttling\")\n ).expect(\"create cpu_throttled_seconds_total\");\n let request_queue_depth = Gauge::with_opts(\n Opts::new(\"miroir_request_queue_depth\", \"Number of requests queued waiting for processing\")\n ).expect(\"create request_queue_depth\");\n let background_queue_depth = GaugeVec::new(\n Opts::new(\"miroir_background_queue_depth\", \"Number of background jobs queued by type\"),\n &[\"job_type\"],\n ).expect(\"create background_queue_depth\");\n let peer_pod_count = Gauge::with_opts(\n Opts::new(\"miroir_peer_pod_count\", \"Number of peer miroir pods discovered\")\n ).expect(\"create peer_pod_count\");\n let leader = Gauge::with_opts(\n Opts::new(\"miroir_leader\", \"Whether this pod holds the leader lease (1=yes, 0=no)\")\n ).expect(\"create leader\");\n let owned_shards_count = Gauge::with_opts(\n Opts::new(\"miroir_owned_shards_count\", \"Number of shards owned by this pod\")\n ).expect(\"create owned_shards_count\");\n reg!(memory_pressure);\n reg!(cpu_throttled_seconds_total);\n reg!(request_queue_depth);\n reg!(background_queue_depth);\n reg!(peer_pod_count);\n reg!(leader);\n reg!(owned_shards_count);\n\n // ── Admin session sealing metrics (always present) ──\n let admin_session_key_generated = Gauge::with_opts(\n Opts::new(\"miroir_admin_session_key_generated\",\n \"Whether ADMIN_SESSION_SEAL_KEY was generated at startup (1=yes, 0=set via env)\")\n ).expect(\"create admin_session_key_generated\");\n let admin_session_revoked_total = Counter::with_opts(\n Opts::new(\"miroir_admin_session_revoked_total\",\n \"Admin sessions revoked via logout\")\n ).expect(\"create admin_session_revoked_total\");\n reg!(admin_session_key_generated);\n reg!(admin_session_revoked_total);\n\n // ── §13.5 Two-phase settings broadcast metrics (always present) ──\n let settings_broadcast_phase = GaugeVec::new(\n Opts::new(\"miroir_settings_broadcast_phase\", \"Current phase of settings broadcast (0=idle, 1=propose, 2=verify, 3=commit)\"),\n &[\"index\"],\n ).expect(\"create settings_broadcast_phase\");\n let settings_hash_mismatch_total = Counter::with_opts(\n Opts::new(\"miroir_settings_hash_mismatch_total\", \"Settings hash mismatches detected during verify phase\"),\n ).expect(\"create settings_hash_mismatch_total\");\n let settings_drift_repair_total = CounterVec::new(\n Opts::new(\"miroir_settings_drift_repair_total\", \"Settings drift repairs performed by drift reconciler\"),\n &[\"index\"],\n ).expect(\"create settings_drift_repair_total\");\n let settings_version = GaugeVec::new(\n Opts::new(\"miroir_settings_version\", \"Current settings version per index\"),\n &[\"index\"],\n ).expect(\"create settings_version\");\n reg!(settings_broadcast_phase);\n reg!(settings_hash_mismatch_total);\n reg!(settings_drift_repair_total);\n reg!(settings_version);\n\n // ── §13.7 Alias metrics (always present) ──\n let alias_resolutions_total = CounterVec::new(\n Opts::new(\"miroir_alias_resolutions_total\", \"Number of alias resolutions\"),\n &[\"alias\"],\n ).expect(\"create alias_resolutions_total\");\n let alias_flips_total = CounterVec::new(\n Opts::new(\"miroir_alias_flips_total\", \"Number of alias flips\"),\n &[\"alias\"],\n ).expect(\"create alias_flips_total\");\n reg!(alias_resolutions_total);\n reg!(alias_flips_total);\n\n // ── §13.6 Session pinning metrics (always present) ──\n let session_active_count = Gauge::new(\n \"miroir_session_active_count\",\n \"Number of active sessions\",\n ).expect(\"create session_active_count\");\n let session_pin_enforced_total = CounterVec::new(\n Opts::new(\"miroir_session_pin_enforced_total\", \"Number of times session pin was enforced\"),\n &[\"strategy\"],\n ).expect(\"create session_pin_enforced_total\");\n let session_wait_duration_seconds = Histogram::with_opts(\n HistogramOpts::new(\n \"miroir_session_wait_duration_seconds\",\n \"Duration of session pin wait operations\",\n )\n .buckets(vec![0.001, 0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0]),\n ).expect(\"create session_wait_duration_seconds\");\n let session_wait_timeout_total = CounterVec::new(\n Opts::new(\"miroir_session_wait_timeout_total\", \"Number of session pin wait timeouts\"),\n &[\"strategy\"],\n ).expect(\"create session_wait_timeout_total\");\n reg!(session_active_count);\n reg!(session_pin_enforced_total);\n reg!(session_wait_duration_seconds);\n reg!(session_wait_timeout_total);\n\n Self {\n registry,\n request_duration,\n requests_total,\n requests_in_flight,\n node_healthy,\n node_request_duration,\n node_errors,\n shard_coverage,\n degraded_shards,\n shard_distribution,\n task_processing_age,\n tasks_total,\n task_registry_size,\n scatter_fan_out_size,\n scatter_partial_responses,\n scatter_retries,\n rebalance_in_progress,\n rebalance_documents_migrated,\n rebalance_duration,\n multisearch_queries_per_batch,\n multisearch_batches_total,\n multisearch_partial_failures_total,\n multisearch_tenant_session_pin_override_total,\n vector_search_over_fetched_total,\n vector_merge_strategy,\n vector_embedder_drift_total,\n cdc_events_published_total,\n cdc_lag_seconds,\n cdc_buffer_bytes,\n cdc_dropped_total,\n cdc_events_suppressed_total,\n ttl_documents_expired_total,\n ttl_sweep_duration_seconds,\n ttl_pending_estimate,\n tenant_queries_total,\n tenant_pinned_groups,\n tenant_fallback_total,\n shadow_diff_total,\n shadow_kendall_tau,\n shadow_latency_delta_seconds,\n shadow_errors_total,\n rollover_events_total,\n rollover_active_indexes,\n rollover_documents_expired_total,\n rollover_last_action_seconds,\n canary_runs_total,\n canary_latency_ms,\n canary_assertion_failures_total,\n admin_ui_sessions_total,\n admin_ui_action_total,\n admin_ui_destructive_action_total,\n explain_requests_total,\n explain_warnings_total,\n explain_execute_total,\n search_ui_sessions_total,\n search_ui_queries_total,\n search_ui_zero_hits_total,\n search_ui_click_through_total,\n search_ui_p95_ms,\n memory_pressure,\n cpu_throttled_seconds_total,\n request_queue_depth,\n background_queue_depth,\n peer_pod_count,\n leader,\n owned_shards_count,\n admin_session_key_generated,\n admin_session_revoked_total,\n settings_broadcast_phase,\n settings_hash_mismatch_total,\n settings_drift_repair_total,\n settings_version,\n alias_resolutions_total,\n alias_flips_total,\n session_active_count,\n session_pin_enforced_total,\n session_wait_duration_seconds,\n session_wait_timeout_total,\n }\n }\n\n pub fn encode_metrics(&self) -> Result {\n let encoder = TextEncoder::new();\n let metric_families = self.registry.gather();\n let mut buffer = Vec::new();\n encoder.encode(&metric_families, &mut buffer)?;\n Ok(String::from_utf8(buffer).map_err(|e| {\n prometheus::Error::Msg(format!(\"failed to convert metrics to UTF-8: {}\", e))\n })?)\n }\n\n pub fn admin_session_key_generated(&self) -> Gauge {\n self.admin_session_key_generated.clone()\n }\n\n pub fn admin_session_revoked_total(&self) -> Counter {\n self.admin_session_revoked_total.clone()\n }\n}\n\n/// Generate a short request ID from UUIDv7.\n///\n/// UUIDv7 provides time-ordered unique IDs. We take the first 8 hex characters,\n/// hash them, and encode as hex for a short, URL-safe identifier.\npub fn generate_request_id() -> String {\n let uuid = Uuid::now_v7();\n let uuid_str = uuid.simple().to_string();\n // Take first 8 chars (enough entropy for uniqueness)\n let prefix = &uuid_str[..8];\n\n // Hash to get a consistent short representation\n let mut hasher = DefaultHasher::new();\n prefix.hash(&mut hasher);\n let hash = hasher.finish();\n\n // Encode as hex (16 chars = 64 bits)\n format!(\"{:016x}\", hash)\n}\n\n/// Extension trait to add request ID extraction utilities.\npub trait RequestIdExt {\n fn get_request_id(&self) -> Option;\n fn set_request_id(&mut self, id: &str);\n}\n\nimpl RequestIdExt for HeaderMap {\n fn get_request_id(&self) -> Option {\n self.get(\"x-request-id\")\n .and_then(|v| v.to_str().ok())\n .map(|s| s.to_string())\n }\n\n fn set_request_id(&mut self, id: &str) {\n if let Ok(val) = HeaderValue::from_str(id) {\n self.insert(\"x-request-id\", val);\n }\n }\n}\n\n/// Guard that decrements the in-flight gauge when dropped.\n///\n/// This ensures that even if the handler panics, the in-flight count\n/// is accurately decremented.\nstruct InFlightGuard {\n metrics: Metrics,\n request_id: String,\n}\n\nimpl InFlightGuard {\n fn new(metrics: Metrics, request_id: String) -> Self {\n metrics.requests_in_flight.inc();\n tracing::trace!(\n request_id = %request_id,\n requests_in_flight = metrics.requests_in_flight.get(),\n \"request started\"\n );\n Self { metrics, request_id }\n }\n}\n\nimpl Drop for InFlightGuard {\n fn drop(&mut self) {\n self.metrics.requests_in_flight.dec();\n tracing::trace!(\n request_id = %self.request_id,\n requests_in_flight = self.metrics.requests_in_flight.get(),\n \"request completed\"\n );\n }\n}\n\n/// Extract the path template from the matched route.\n///\n/// Axum's MatchedPath extractor provides the route template (e.g., \"/indexes/{uid}/search\")\n/// instead of the actual path (e.g., \"/indexes/products/search\"), avoiding high-cardinality labels.\nfn extract_path_template(request: &Request) -> String {\n request\n .extensions()\n .get::()\n .map(|mp| mp.as_str())\n .unwrap_or_else(|| request.uri().path())\n .to_string()\n}\n\n/// Main middleware that combines request ID injection, structured logging, and Prometheus metrics.\n///\n/// IMPORTANT: This middleware must be applied AFTER request_id_middleware in the layer stack\n/// (i.e., its layer() call must come BEFORE request_id_middleware's layer() call).\n/// This ensures the request_id header is already set when this middleware runs.\npub async fn telemetry_middleware(\n State(telemetry): State,\n mut req: Request,\n next: Next,\n) -> Response {\n let start = Instant::now();\n let method = req.method().clone();\n let path_template = extract_path_template(&req);\n let metrics = telemetry.metrics.clone();\n let pod_id = telemetry.pod_id.clone();\n\n // Extract request ID from header (set by request_id_middleware)\n // The header must already exist because request_id_middleware runs first.\n let request_id = req\n .headers()\n .get_request_id()\n .expect(\"request_id header must be set by request_id_middleware\");\n req.headers_mut().set_request_id(&request_id);\n\n // Create span for structured logging with pod_id included.\n // Note: raw path is intentionally omitted to avoid logging index names\n // (which may contain customer identifiers). Use path_template instead.\n let span = info_span!(\n \"request\",\n request_id = %request_id,\n pod_id = %pod_id,\n method = %method,\n path_template = %path_template,\n );\n\n let _guard = span.enter();\n\n // Track in-flight requests\n let in_flight = InFlightGuard::new(metrics.clone(), request_id.clone());\n\n let response = next.run(req).await;\n\n drop(in_flight);\n\n let status = response.status();\n let status_u16 = status.as_u16();\n let duration = start.elapsed();\n\n // Record Prometheus metrics\n metrics\n .request_duration\n .with_label_values(&[method.as_str(), &path_template, &status_u16.to_string()])\n .observe(duration.as_secs_f64());\n metrics\n .requests_total\n .with_label_values(&[method.as_str(), &path_template, &status_u16.to_string()])\n .inc();\n\n // Structured log entry (plan §10 shape)\n // Base fields: timestamp (from tracing-subscriber), level, message, duration_ms\n // Additional fields (index, node_count, estimated_hits, degraded)\n // are added by request handlers via the tracing span.\n let message = format!(\"{} {}\", method, status);\n if status.is_server_error() {\n tracing::error!(\n target: \"miroir.request\",\n pod_id = %pod_id,\n request_id = %request_id,\n message = %message,\n duration_ms = duration.as_millis() as u64,\n status = status_u16,\n method = %method,\n path_template = %path_template,\n );\n } else if status.is_client_error() {\n tracing::warn!(\n target: \"miroir.request\",\n pod_id = %pod_id,\n request_id = %request_id,\n message = %message,\n duration_ms = duration.as_millis() as u64,\n status = status_u16,\n method = %method,\n path_template = %path_template,\n );\n } else {\n tracing::info!(\n target: \"miroir.request\",\n pod_id = %pod_id,\n request_id = %request_id,\n message = %message,\n duration_ms = duration.as_millis() as u64,\n status = status_u16,\n method = %method,\n path_template = %path_template,\n );\n }\n\n // Ensure request ID is in response headers\n let mut response = response;\n if !response.headers().contains_key(\"x-request-id\") {\n if let Ok(val) = HeaderValue::from_str(&request_id) {\n response.headers_mut().insert(\"x-request-id\", val);\n }\n }\n\n response\n}\n\n/// Create the metrics router for the :9090 server.\npub fn metrics_router() -> Router {\n Router::new().route(\"/metrics\", get(metrics_handler))\n}\n\n/// Handler that returns Prometheus metrics in text exposition format.\nasync fn metrics_handler(State(metrics): State) -> String {\n match metrics.encode_metrics() {\n Ok(metrics) => metrics,\n Err(e) => {\n tracing::error!(error = %e, \"failed to encode metrics\");\n format!(\"# ERROR: failed to encode metrics: {}\\n\", e)\n }\n }\n}\n\n/// Accessor methods for metrics that can be used by other parts of the application.\nimpl Metrics {\n // ── Scatter-gather ──\n\n pub fn record_scatter_fan_out(&self, size: u64) {\n self.scatter_fan_out_size.observe(size as f64);\n }\n\n pub fn inc_scatter_partial_responses(&self) {\n self.scatter_partial_responses.inc();\n }\n\n pub fn inc_scatter_retries(&self) {\n self.scatter_retries.inc();\n }\n\n // ── Node health ──\n\n pub fn set_node_healthy(&self, node_id: &str, healthy: bool) {\n self.node_healthy.with_label_values(&[node_id]).set(if healthy { 1.0 } else { 0.0 });\n }\n\n pub fn record_node_request_duration(&self, node_id: &str, operation: &str, duration_secs: f64) {\n self.node_request_duration.with_label_values(&[node_id, operation]).observe(duration_secs);\n }\n\n pub fn inc_node_errors(&self, node_id: &str, error_type: &str) {\n self.node_errors.with_label_values(&[node_id, error_type]).inc();\n }\n\n // ── Shards ──\n\n pub fn set_shard_coverage(&self, coverage: f64) {\n self.shard_coverage.set(coverage);\n }\n\n pub fn set_degraded_shards(&self, count: f64) {\n self.degraded_shards.set(count);\n }\n\n pub fn set_shard_distribution(&self, node_id: &str, count: f64) {\n self.shard_distribution.with_label_values(&[node_id]).set(count);\n }\n\n // ── Tasks ──\n\n pub fn observe_task_processing_age(&self, age_secs: f64) {\n self.task_processing_age.observe(age_secs);\n }\n\n pub fn inc_tasks_total(&self, status: &str) {\n self.tasks_total.with_label_values(&[status]).inc();\n }\n\n pub fn set_task_registry_size(&self, size: f64) {\n self.task_registry_size.set(size);\n }\n\n // ── Rebalancer ──\n\n pub fn set_rebalance_in_progress(&self, v: bool) {\n self.rebalance_in_progress.set(if v { 1.0 } else { 0.0 });\n }\n\n pub fn inc_rebalance_documents_migrated(&self, count: u64) {\n self.rebalance_documents_migrated.inc_by(count as f64);\n }\n\n pub fn observe_rebalance_duration(&self, secs: f64) {\n self.rebalance_duration.observe(secs);\n }\n\n // ── §13.11 Multi-search ──\n\n pub fn observe_multisearch_queries_per_batch(&self, count: u64) {\n if let Some(ref m) = self.multisearch_queries_per_batch {\n m.observe(count as f64);\n }\n }\n\n pub fn inc_multisearch_batches_total(&self) {\n if let Some(ref m) = self.multisearch_batches_total {\n m.inc();\n }\n }\n\n pub fn inc_multisearch_partial_failures(&self) {\n if let Some(ref m) = self.multisearch_partial_failures_total {\n m.inc();\n }\n }\n\n pub fn inc_multisearch_tenant_session_pin_override(&self, tenant: &str) {\n if let Some(ref m) = self.multisearch_tenant_session_pin_override_total {\n m.with_label_values(&[tenant]).inc();\n }\n }\n\n // ── §13.12 Vector search ──\n\n pub fn inc_vector_search_over_fetched(&self) {\n if let Some(ref m) = self.vector_search_over_fetched_total {\n m.inc();\n }\n }\n\n pub fn inc_vector_merge_strategy(&self, strategy: &str) {\n if let Some(ref m) = self.vector_merge_strategy {\n m.with_label_values(&[strategy]).inc();\n }\n }\n\n pub fn inc_vector_embedder_drift(&self) {\n if let Some(ref m) = self.vector_embedder_drift_total {\n m.inc();\n }\n }\n\n // ── §13.13 CDC ──\n\n pub fn inc_cdc_events_published(&self, sink: &str, index: &str) {\n if let Some(ref m) = self.cdc_events_published_total {\n m.with_label_values(&[sink, index]).inc();\n }\n }\n\n pub fn set_cdc_lag_seconds(&self, sink: &str, lag: f64) {\n if let Some(ref m) = self.cdc_lag_seconds {\n m.with_label_values(&[sink]).set(lag);\n }\n }\n\n pub fn set_cdc_buffer_bytes(&self, sink: &str, bytes: f64) {\n if let Some(ref m) = self.cdc_buffer_bytes {\n m.with_label_values(&[sink]).set(bytes);\n }\n }\n\n pub fn inc_cdc_dropped(&self, sink: &str) {\n if let Some(ref m) = self.cdc_dropped_total {\n m.with_label_values(&[sink]).inc();\n }\n }\n\n pub fn inc_cdc_events_suppressed(&self, origin: &str) {\n if let Some(ref m) = self.cdc_events_suppressed_total {\n m.with_label_values(&[origin]).inc();\n }\n }\n\n // ── §13.14 TTL ──\n\n pub fn inc_ttl_documents_expired(&self, index: &str) {\n if let Some(ref m) = self.ttl_documents_expired_total {\n m.with_label_values(&[index]).inc();\n }\n }\n\n pub fn observe_ttl_sweep_duration(&self, index: &str, secs: f64) {\n if let Some(ref m) = self.ttl_sweep_duration_seconds {\n m.with_label_values(&[index]).observe(secs);\n }\n }\n\n pub fn set_ttl_pending_estimate(&self, index: &str, count: f64) {\n if let Some(ref m) = self.ttl_pending_estimate {\n m.with_label_values(&[index]).set(count);\n }\n }\n\n // ── §13.15 Tenant affinity ──\n\n pub fn inc_tenant_queries(&self, tenant: &str, group: &str) {\n if let Some(ref m) = self.tenant_queries_total {\n m.with_label_values(&[tenant, group]).inc();\n }\n }\n\n pub fn set_tenant_pinned_groups(&self, tenant: &str, group: u32) {\n if let Some(ref m) = self.tenant_pinned_groups {\n m.with_label_values(&[tenant]).set(group as f64);\n }\n }\n\n pub fn inc_tenant_fallback(&self, reason: &str) {\n if let Some(ref m) = self.tenant_fallback_total {\n m.with_label_values(&[reason]).inc();\n }\n }\n\n // ── §13.16 Shadow ──\n\n pub fn inc_shadow_diff(&self, kind: &str) {\n if let Some(ref m) = self.shadow_diff_total {\n m.with_label_values(&[kind]).inc();\n }\n }\n\n pub fn set_shadow_kendall_tau(&self, tau: f64) {\n if let Some(ref m) = self.shadow_kendall_tau {\n m.set(tau);\n }\n }\n\n pub fn observe_shadow_latency_delta(&self, delta: f64) {\n if let Some(ref m) = self.shadow_latency_delta_seconds {\n m.observe(delta);\n }\n }\n\n pub fn inc_shadow_errors(&self, target: &str, side: &str) {\n if let Some(ref m) = self.shadow_errors_total {\n m.with_label_values(&[target, side]).inc();\n }\n }\n\n // ── §13.17 ILM ──\n\n pub fn inc_rollover_events(&self, policy: &str) {\n if let Some(ref m) = self.rollover_events_total {\n m.with_label_values(&[policy]).inc();\n }\n }\n\n pub fn set_rollover_active_indexes(&self, alias: &str, count: f64) {\n if let Some(ref m) = self.rollover_active_indexes {\n m.with_label_values(&[alias]).set(count);\n }\n }\n\n pub fn inc_rollover_documents_expired(&self, policy: &str) {\n if let Some(ref m) = self.rollover_documents_expired_total {\n m.with_label_values(&[policy]).inc();\n }\n }\n\n pub fn set_rollover_last_action_seconds(&self, policy: &str, secs: f64) {\n if let Some(ref m) = self.rollover_last_action_seconds {\n m.with_label_values(&[policy]).set(secs);\n }\n }\n\n // ── §13.18 Canary ──\n\n pub fn inc_canary_runs(&self, canary: &str, result: &str) {\n if let Some(ref m) = self.canary_runs_total {\n m.with_label_values(&[canary, result]).inc();\n }\n }\n\n pub fn observe_canary_latency_ms(&self, canary: &str, ms: f64) {\n if let Some(ref m) = self.canary_latency_ms {\n m.with_label_values(&[canary]).observe(ms);\n }\n }\n\n pub fn inc_canary_assertion_failures(&self, canary: &str, assertion_type: &str) {\n if let Some(ref m) = self.canary_assertion_failures_total {\n m.with_label_values(&[canary, assertion_type]).inc();\n }\n }\n\n // ── §13.19 Admin UI ──\n\n pub fn inc_admin_ui_sessions(&self) {\n if let Some(ref m) = self.admin_ui_sessions_total {\n m.inc();\n }\n }\n\n pub fn inc_admin_ui_action(&self, action: &str) {\n if let Some(ref m) = self.admin_ui_action_total {\n m.with_label_values(&[action]).inc();\n }\n }\n\n pub fn inc_admin_ui_destructive_action(&self, action: &str) {\n if let Some(ref m) = self.admin_ui_destructive_action_total {\n m.with_label_values(&[action]).inc();\n }\n }\n\n // ── §13.20 Explain ──\n\n pub fn inc_explain_requests(&self) {\n if let Some(ref m) = self.explain_requests_total {\n m.inc();\n }\n }\n\n pub fn inc_explain_warnings(&self, warning_type: &str) {\n if let Some(ref m) = self.explain_warnings_total {\n m.with_label_values(&[warning_type]).inc();\n }\n }\n\n pub fn inc_explain_execute(&self) {\n if let Some(ref m) = self.explain_execute_total {\n m.inc();\n }\n }\n\n // ── §13.21 Search UI ──\n\n pub fn inc_search_ui_sessions(&self) {\n if let Some(ref m) = self.search_ui_sessions_total {\n m.inc();\n }\n }\n\n pub fn inc_search_ui_queries(&self, index: &str) {\n if let Some(ref m) = self.search_ui_queries_total {\n m.with_label_values(&[index]).inc();\n }\n }\n\n pub fn inc_search_ui_zero_hits(&self, index: &str) {\n if let Some(ref m) = self.search_ui_zero_hits_total {\n m.with_label_values(&[index]).inc();\n }\n }\n\n pub fn inc_search_ui_click_through(&self, index: &str) {\n if let Some(ref m) = self.search_ui_click_through_total {\n m.with_label_values(&[index]).inc();\n }\n }\n\n pub fn set_search_ui_p95_ms(&self, index: &str, ms: f64) {\n if let Some(ref m) = self.search_ui_p95_ms {\n m.with_label_values(&[index]).set(ms);\n }\n }\n\n // ── §14.9 Resource-pressure ──\n\n pub fn set_memory_pressure(&self, level: u32) {\n self.memory_pressure.set(level as f64);\n }\n\n pub fn inc_cpu_throttled_seconds(&self, secs: f64) {\n self.cpu_throttled_seconds_total.inc_by(secs);\n }\n\n pub fn set_request_queue_depth(&self, depth: u64) {\n self.request_queue_depth.set(depth as f64);\n }\n\n pub fn set_background_queue_depth(&self, job_type: &str, depth: u64) {\n self.background_queue_depth.with_label_values(&[job_type]).set(depth as f64);\n }\n\n pub fn set_peer_pod_count(&self, count: u64) {\n self.peer_pod_count.set(count as f64);\n }\n\n pub fn set_leader(&self, is_leader: bool) {\n self.leader.set(if is_leader { 1.0 } else { 0.0 });\n }\n\n pub fn set_owned_shards_count(&self, count: u64) {\n self.owned_shards_count.set(count as f64);\n }\n\n // ── §13.5 Two-phase settings broadcast metrics ──\n\n pub fn set_settings_broadcast_phase(&self, index: &str, phase: u8) {\n self.settings_broadcast_phase.with_label_values(&[index]).set(phase as f64);\n }\n\n pub fn clear_settings_broadcast_phase(&self, index: &str) {\n self.settings_broadcast_phase.with_label_values(&[index]).set(0.0);\n }\n\n pub fn inc_settings_hash_mismatch(&self) {\n self.settings_hash_mismatch_total.inc();\n }\n\n pub fn inc_settings_drift_repair(&self, index: &str) {\n self.settings_drift_repair_total.with_label_values(&[index]).inc();\n }\n\n pub fn set_settings_version(&self, index: &str, version: u64) {\n self.settings_version.with_label_values(&[index]).set(version as f64);\n }\n\n pub fn get_settings_version(&self, index: &str) -> f64 {\n self.settings_version.with_label_values(&[index]).get()\n }\n\n // ── §13.7 Alias metrics ──\n\n pub fn inc_alias_resolution(&self, alias: &str) {\n self.alias_resolutions_total.with_label_values(&[alias]).inc();\n }\n\n pub fn inc_alias_flip(&self, alias: &str) {\n self.alias_flips_total.with_label_values(&[alias]).inc();\n }\n\n // ── §13.6 Session pinning metrics ──\n\n pub fn set_session_active_count(&self, count: u64) {\n self.session_active_count.set(count as f64);\n }\n\n pub fn inc_session_pin_enforced(&self, strategy: &str) {\n self.session_pin_enforced_total.with_label_values(&[strategy]).inc();\n }\n\n pub fn observe_session_wait_duration(&self, duration_seconds: f64) {\n self.session_wait_duration_seconds.observe(duration_seconds);\n }\n\n pub fn inc_session_wait_timeout(&self, strategy: &str) {\n self.session_wait_timeout_total.with_label_values(&[strategy]).inc();\n }\n\n pub fn registry(&self) -> &Registry {\n &self.registry\n }\n}\n\n#[cfg(test)]\nmod tests {\n use super::*;\n\n #[test]\n fn test_request_id_generation() {\n // Generate multiple IDs to verify format\n for _ in 0..10 {\n let id = generate_request_id();\n\n // IDs should be 16 hex chars (64-bit hash)\n assert_eq!(id.len(), 16);\n\n // IDs should be hexadecimal\n assert!(id.chars().all(|c| c.is_ascii_hexdigit()));\n }\n\n // Test that different UUID prefixes produce different IDs\n let id1 = generate_request_id();\n std::thread::sleep(std::time::Duration::from_millis(5));\n let id2 = generate_request_id();\n // In production, time ensures uniqueness; test just verifies format above\n assert_eq!(id1.len(), 16);\n assert_eq!(id2.len(), 16);\n }\n\n #[test]\n fn test_metrics_creation() {\n // Default config has all §13 features enabled\n let metrics = Metrics::new(&MiroirConfig::default());\n\n // Add some sample data to ensure metrics show up in output\n metrics.request_duration.with_label_values(&[\"GET\", \"/test\", \"200\"]).observe(0.1);\n metrics.requests_total.with_label_values(&[\"GET\", \"/test\", \"200\"]).inc();\n metrics.requests_in_flight.inc();\n metrics.node_healthy.with_label_values(&[\"test-node\"]).set(1.0);\n metrics.node_request_duration.with_label_values(&[\"test-node\", \"search\"]).observe(0.05);\n metrics.node_errors.with_label_values(&[\"test-node\", \"timeout\"]).inc();\n metrics.shard_coverage.set(1.0);\n metrics.degraded_shards.set(0.0);\n metrics.shard_distribution.with_label_values(&[\"test-node\"]).set(32.0);\n metrics.task_processing_age.observe(0.1);\n metrics.tasks_total.with_label_values(&[\"completed\"]).inc();\n metrics.task_registry_size.set(5.0);\n metrics.scatter_fan_out_size.observe(3.0);\n metrics.scatter_partial_responses.inc();\n metrics.scatter_retries.inc();\n metrics.rebalance_in_progress.set(0.0);\n metrics.rebalance_documents_migrated.inc();\n metrics.rebalance_duration.observe(10.0);\n\n // Write to advanced Vec metrics so they appear in output\n metrics.inc_multisearch_tenant_session_pin_override(\"t1\");\n metrics.inc_vector_merge_strategy(\"convex\");\n metrics.inc_cdc_events_published(\"webhook\", \"idx1\");\n metrics.set_cdc_lag_seconds(\"webhook\", 0.5);\n metrics.set_cdc_buffer_bytes(\"webhook\", 1024.0);\n metrics.inc_cdc_dropped(\"webhook\");\n metrics.inc_cdc_events_suppressed(\"origin1\");\n metrics.inc_ttl_documents_expired(\"idx1\");\n metrics.observe_ttl_sweep_duration(\"idx1\", 0.1);\n metrics.set_ttl_pending_estimate(\"idx1\", 50.0);\n metrics.inc_tenant_queries(\"t1\", \"g1\");\n metrics.set_tenant_pinned_groups(\"t1\", 1);\n metrics.inc_tenant_fallback(\"no_group\");\n metrics.inc_shadow_diff(\"rank\");\n metrics.inc_shadow_errors(\"target1\", \"primary\");\n metrics.inc_rollover_events(\"policy1\");\n metrics.set_rollover_active_indexes(\"alias1\", 1.0);\n metrics.inc_rollover_documents_expired(\"policy1\");\n metrics.set_rollover_last_action_seconds(\"policy1\", 60.0);\n metrics.inc_canary_runs(\"canary1\", \"pass\");\n metrics.observe_canary_latency_ms(\"canary1\", 50.0);\n metrics.inc_canary_assertion_failures(\"canary1\", \"latency\");\n metrics.inc_admin_ui_action(\"login\");\n metrics.inc_admin_ui_destructive_action(\"delete_index\");\n metrics.inc_explain_warnings(\"slow_plan\");\n metrics.inc_search_ui_queries(\"idx1\");\n metrics.inc_search_ui_zero_hits(\"idx1\");\n metrics.inc_search_ui_click_through(\"idx1\");\n metrics.set_search_ui_p95_ms(\"idx1\", 150.0);\n\n // §14.9 Resource-pressure metrics\n metrics.set_memory_pressure(0);\n metrics.inc_cpu_throttled_seconds(1.5);\n metrics.set_request_queue_depth(42);\n metrics.set_background_queue_depth(\"rebalance\", 5);\n metrics.set_background_queue_depth(\"replication\", 3);\n metrics.set_peer_pod_count(3);\n metrics.set_leader(true);\n metrics.set_owned_shards_count(12);\n\n let encoded = metrics.encode_metrics();\n assert!(encoded.is_ok());\n\n let output = encoded.unwrap();\n\n // Verify all 18 core plan §10 metric names appear in the output\n let expected_metrics = [\n // Request metrics\n \"miroir_request_duration_seconds\",\n \"miroir_requests_total\",\n \"miroir_requests_in_flight\",\n // Node health metrics\n \"miroir_node_healthy\",\n \"miroir_node_request_duration_seconds\",\n \"miroir_node_errors_total\",\n // Shard metrics\n \"miroir_shard_coverage\",\n \"miroir_degraded_shards_total\",\n \"miroir_shard_distribution\",\n // Task metrics\n \"miroir_task_processing_age_seconds\",\n \"miroir_tasks_total\",\n \"miroir_task_registry_size\",\n // Scatter-gather metrics\n \"miroir_scatter_fan_out_size\",\n \"miroir_scatter_partial_responses_total\",\n \"miroir_scatter_retries_total\",\n // Rebalancer metrics\n \"miroir_rebalance_in_progress\",\n \"miroir_rebalance_documents_migrated_total\",\n \"miroir_rebalance_duration_seconds\",\n ];\n for name in &expected_metrics {\n assert!(output.contains(name), \"missing metric: {}\", name);\n }\n\n // With defaults (all §13 enabled), advanced metrics should be present\n let advanced_metrics = [\n // §13.11 Multi-search\n \"miroir_multisearch_queries_per_batch\",\n \"miroir_multisearch_batches_total\",\n \"miroir_multisearch_partial_failures_total\",\n \"miroir_tenant_session_pin_override_total\",\n // §13.12 Vector\n \"miroir_vector_search_over_fetched_total\",\n \"miroir_vector_merge_strategy\",\n \"miroir_vector_embedder_drift_total\",\n // §13.13 CDC\n \"miroir_cdc_events_published_total\",\n \"miroir_cdc_lag_seconds\",\n \"miroir_cdc_buffer_bytes\",\n \"miroir_cdc_dropped_total\",\n \"miroir_cdc_events_suppressed_total\",\n // §13.14 TTL\n \"miroir_ttl_documents_expired_total\",\n \"miroir_ttl_sweep_duration_seconds\",\n \"miroir_ttl_pending_estimate\",\n // §13.15 Tenant\n \"miroir_tenant_queries_total\",\n \"miroir_tenant_pinned_groups\",\n \"miroir_tenant_fallback_total\",\n // §13.16 Shadow\n \"miroir_shadow_diff_total\",\n \"miroir_shadow_kendall_tau\",\n \"miroir_shadow_latency_delta_seconds\",\n \"miroir_shadow_errors_total\",\n // §13.17 ILM\n \"miroir_rollover_events_total\",\n \"miroir_rollover_active_indexes\",\n \"miroir_rollover_documents_expired_total\",\n \"miroir_rollover_last_action_seconds\",\n // §13.18 Canary\n \"miroir_canary_runs_total\",\n \"miroir_canary_latency_ms\",\n \"miroir_canary_assertion_failures_total\",\n // §13.19 Admin UI\n \"miroir_admin_ui_sessions_total\",\n \"miroir_admin_ui_action_total\",\n \"miroir_admin_ui_destructive_action_total\",\n // §13.20 Explain\n \"miroir_explain_requests_total\",\n \"miroir_explain_warnings_total\",\n \"miroir_explain_execute_total\",\n // §13.21 Search UI\n \"miroir_search_ui_sessions_total\",\n \"miroir_search_ui_queries_total\",\n \"miroir_search_ui_zero_hits_total\",\n \"miroir_search_ui_click_through_total\",\n \"miroir_search_ui_p95_ms\",\n ];\n for name in &advanced_metrics {\n assert!(output.contains(name), \"missing advanced metric: {}\", name);\n }\n }\n\n #[test]\n fn test_metrics_feature_flags_off() {\n // Build a config with all §13.11-13.21 features disabled\n let mut config = MiroirConfig::default();\n config.multi_search.enabled = false;\n config.vector_search.enabled = false;\n config.cdc.enabled = false;\n config.ttl.enabled = false;\n config.tenant_affinity.enabled = false;\n config.shadow.enabled = false;\n config.ilm.enabled = false;\n config.canary_runner.enabled = false;\n config.admin_ui.enabled = false;\n config.explain.enabled = false;\n config.search_ui.enabled = false;\n\n let metrics = Metrics::new(&config);\n\n // Write to core Vec metrics so they appear in output\n metrics.request_duration.with_label_values(&[\"GET\", \"/test\", \"200\"]).observe(0.1);\n\n let encoded = metrics.encode_metrics().unwrap();\n\n // Core metrics should still be present\n assert!(encoded.contains(\"miroir_request_duration_seconds\"));\n assert!(encoded.contains(\"miroir_rebalance_duration_seconds\"));\n\n // Advanced metrics should NOT appear\n let advanced_names = [\n \"miroir_multisearch_queries_per_batch\",\n \"miroir_vector_search_over_fetched_total\",\n \"miroir_cdc_events_published_total\",\n \"miroir_ttl_documents_expired_total\",\n \"miroir_tenant_queries_total\",\n \"miroir_shadow_diff_total\",\n \"miroir_rollover_events_total\",\n \"miroir_canary_runs_total\",\n \"miroir_admin_ui_sessions_total\",\n \"miroir_explain_requests_total\",\n \"miroir_search_ui_sessions_total\",\n ];\n for name in &advanced_names {\n assert!(!encoded.contains(name), \"advanced metric should not appear when disabled: {}\", name);\n }\n }\n\n #[test]\n fn test_feature_gated_accessors_noop_when_disabled() {\n let mut config = MiroirConfig::default();\n config.multi_search.enabled = false;\n config.vector_search.enabled = false;\n config.cdc.enabled = false;\n config.ttl.enabled = false;\n config.tenant_affinity.enabled = false;\n config.shadow.enabled = false;\n config.ilm.enabled = false;\n config.canary_runner.enabled = false;\n config.admin_ui.enabled = false;\n config.explain.enabled = false;\n config.search_ui.enabled = false;\n\n let metrics = Metrics::new(&config);\n\n // All accessor methods should be safe to call (no-op)\n metrics.observe_multisearch_queries_per_batch(5);\n metrics.inc_multisearch_batches_total();\n metrics.inc_multisearch_partial_failures();\n metrics.inc_multisearch_tenant_session_pin_override(\"t1\");\n metrics.inc_vector_search_over_fetched();\n metrics.inc_vector_merge_strategy(\"convex\");\n metrics.inc_vector_embedder_drift();\n metrics.inc_cdc_events_published(\"webhook\", \"idx\");\n metrics.set_cdc_lag_seconds(\"webhook\", 1.5);\n metrics.set_cdc_buffer_bytes(\"webhook\", 1024.0);\n metrics.inc_cdc_dropped(\"webhook\");\n metrics.inc_cdc_events_suppressed(\"origin1\");\n metrics.inc_ttl_documents_expired(\"idx\");\n metrics.observe_ttl_sweep_duration(\"idx\", 0.1);\n metrics.set_ttl_pending_estimate(\"idx\", 50.0);\n metrics.inc_tenant_queries(\"t1\", \"0\");\n metrics.set_tenant_pinned_groups(\"t1\", 1);\n metrics.inc_tenant_fallback(\"no_group\");\n metrics.inc_shadow_diff(\"rank\");\n metrics.set_shadow_kendall_tau(0.95);\n metrics.observe_shadow_latency_delta(0.01);\n metrics.inc_shadow_errors(\"target1\", \"primary\");\n metrics.inc_rollover_events(\"policy1\");\n metrics.set_rollover_active_indexes(\"alias1\", 1.0);\n metrics.inc_rollover_documents_expired(\"policy1\");\n metrics.set_rollover_last_action_seconds(\"policy1\", 60.0);\n metrics.inc_canary_runs(\"canary1\", \"pass\");\n metrics.observe_canary_latency_ms(\"canary1\", 50.0);\n metrics.inc_canary_assertion_failures(\"canary1\", \"latency\");\n metrics.inc_admin_ui_sessions();\n metrics.inc_admin_ui_action(\"login\");\n metrics.inc_admin_ui_destructive_action(\"delete_index\");\n metrics.inc_explain_requests();\n metrics.inc_explain_warnings(\"slow_plan\");\n metrics.inc_explain_execute();\n metrics.inc_search_ui_sessions();\n metrics.inc_search_ui_queries(\"idx\");\n metrics.inc_search_ui_zero_hits(\"idx\");\n metrics.inc_search_ui_click_through(\"idx\");\n metrics.set_search_ui_p95_ms(\"idx\", 150.0);\n }\n\n #[test]\n fn test_header_request_id() {\n let mut headers = HeaderMap::new();\n assert!(headers.get_request_id().is_none());\n\n headers.set_request_id(\"test-id-123\");\n assert_eq!(headers.get_request_id(), Some(\"test-id-123\".to_string()));\n }\n\n // ---------------------------------------------------------------------------\n // RequestId type tests\n // ---------------------------------------------------------------------------\n\n #[test]\n fn test_request_id_format() {\n let id = RequestId::new();\n // RequestId should be exactly 8 hex characters\n assert_eq!(id.as_str().len(), 8);\n assert!(id.as_str().chars().all(|c| c.is_ascii_hexdigit()));\n }\n\n #[test]\n fn test_request_id_parse_valid() {\n // Valid 8-char hex string\n let valid = \"abcd1234\";\n let parsed = RequestId::parse(valid.to_string());\n assert!(parsed.is_some());\n assert_eq!(parsed.unwrap().as_str(), valid);\n }\n\n #[test]\n fn test_request_id_parse_invalid_wrong_length() {\n // Wrong length (too short)\n assert!(RequestId::parse(\"abc123\".to_string()).is_none());\n // Wrong length (too long)\n assert!(RequestId::parse(\"abcd12345678\".to_string()).is_none());\n }\n\n #[test]\n fn test_request_id_parse_invalid_non_hex() {\n // Contains non-hex characters\n assert!(RequestId::parse(\"abcd1234!\".to_string()).is_none());\n assert!(RequestId::parse(\"ghijklmn\".to_string()).is_none());\n }\n\n #[test]\n fn test_request_id_uniqueness() {\n // Generate two consecutive IDs - they should be different\n // due to UUIDv7's timestamp component\n let id1 = RequestId::new();\n std::thread::sleep(std::time::Duration::from_millis(5));\n let id2 = RequestId::new();\n\n assert_ne!(id1, id2);\n assert_ne!(id1.as_str(), id2.as_str());\n }\n\n // ---------------------------------------------------------------------------\n // Integration tests for request_id_middleware\n // ---------------------------------------------------------------------------\n\n #[tokio::test]\n async fn test_request_id_middleware_adds_header() {\n use axum::{routing::get, Router};\n use http_body_util::Full;\n use tower::ServiceExt;\n\n // Build a simple router with the request ID middleware\n let app = Router::new()\n .route(\"/test\", get(|| async { \"OK\" }))\n .layer(axum::middleware::from_fn(request_id_middleware));\n\n // Create a test request\n let request = Request::builder()\n .uri(\"/test\")\n .body(Full::default())\n .unwrap();\n\n // Send the request\n let response = app.oneshot(request).await.unwrap();\n\n // Verify X-Request-Id header is present\n let header = response\n .headers()\n .get(\"x-request-id\")\n .expect(\"X-Request-Id header should be present\");\n let header_value = header.to_str().unwrap();\n\n // Verify it's 8 hex characters\n assert_eq!(\n header_value.len(),\n 8,\n \"X-Request-Id should be 8 characters\"\n );\n assert!(\n header_value.chars().all(|c| c.is_ascii_hexdigit()),\n \"X-Request-Id should be hexadecimal\"\n );\n }\n\n #[tokio::test]\n async fn test_request_id_middleware_unique_per_request() {\n use axum::{routing::get, Router};\n use http_body_util::Full;\n use tower::ServiceExt;\n\n // Build a simple router with the request ID middleware\n let app = Router::new()\n .route(\"/test\", get(|| async { \"OK\" }))\n .layer(axum::middleware::from_fn(request_id_middleware));\n\n // Create two identical requests\n let request1 = Request::builder()\n .uri(\"/test\")\n .body(Full::default())\n .unwrap();\n\n let request2 = Request::builder()\n .uri(\"/test\")\n .body(Full::default())\n .unwrap();\n\n // Send both requests\n let response1 = app.clone().oneshot(request1).await.unwrap();\n let response2 = app.oneshot(request2).await.unwrap();\n\n // Extract headers\n let id1 = response1\n .headers()\n .get(\"x-request-id\")\n .unwrap()\n .to_str()\n .unwrap();\n let id2 = response2\n .headers()\n .get(\"x-request-id\")\n .unwrap()\n .to_str()\n .unwrap();\n\n // Verify IDs are different (UUIDv7 timestamp ensures this)\n assert_ne!(\n id1, id2,\n \"Two consecutive requests should have different request IDs\"\n );\n\n // Both should still be valid 8-char hex\n assert_eq!(id1.len(), 8);\n assert_eq!(id2.len(), 8);\n }\n\n #[tokio::test]\n async fn test_request_id_middleware_preserves_existing_header() {\n use axum::{routing::get, Router};\n use http_body_util::Full;\n use tower::ServiceExt;\n\n // Build a simple router with the request ID middleware\n let app = Router::new()\n .route(\"/test\", get(|| async { \"OK\" }))\n .layer(axum::middleware::from_fn(request_id_middleware));\n\n // Create a request with a pre-existing X-Request-Id header\n let existing_id = \"deadbeef\";\n let request = Request::builder()\n .uri(\"/test\")\n .header(\"x-request-id\", existing_id)\n .body(Full::default())\n .unwrap();\n\n // Send the request\n let response = app.oneshot(request).await.unwrap();\n\n // Verify the header is preserved\n let header = response\n .headers()\n .get(\"x-request-id\")\n .expect(\"X-Request-Id header should be present\");\n let header_value = header.to_str().unwrap();\n\n assert_eq!(\n header_value, existing_id,\n \"Existing X-Request-Id should be preserved\"\n );\n }\n}\n","structuredPatch":[{"oldStart":1219,"oldLines":6,"newStart":1219,"newLines":16,"lines":[" "," /// Accessor methods for metrics that can be used by other parts of the application."," impl Metrics {","+ // ── Request metrics ──","+","+ pub fn record_request_duration(&self, method: &str, path_template: &str, status: u16, duration_secs: f64) {","+ self.request_duration.with_label_values(&[method, path_template, &status.to_string()]).observe(duration_secs);","+ }","+","+ pub fn inc_requests_total(&self, method: &str, path_template: &str, status: u16) {","+ self.requests_total.with_label_values(&[method, path_template, &status.to_string()]).inc();","+ }","+"," // ── Scatter-gather ──"," "," pub fn record_scatter_fan_out(&self, size: u64) {"]}],"userModified":false,"replaceAll":false}} +{"type":"system","subtype":"status","status":"requesting","uuid":"9d4bcae2-8d9e-4b51-9aa8-79aa2535a106","session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379"} +{"type":"stream_event","event":{"type":"message_start","message":{"id":"msg_20260523142706f1e39de07c6a4f62","type":"message","role":"assistant","model":"glm-4.7","content":[],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0}}},"session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","parent_tool_use_id":null,"uuid":"35d6f035-4c8c-46cb-82f7-f6b7abf1af28","ttft_ms":2409} +{"type":"stream_event","event":{"type":"content_block_start","index":0,"content_block":{"type":"thinking","thinking":"","signature":"d73f49699a2c41ce896491fe"}},"session_id":"22370ae0-df6e-4abf-81b6-c6f5b4e0c379","parent_tool_use_id":null,"uuid":"245dc959-8c27-4592-9deb-2817a1bb16d6"} 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Verifies that all plan §10 core metrics are properly registered and accessible.\n\nuse miroir_proxy::middleware::Metrics;\nuse miroir_core::config::MiroirConfig;\n\n#[test]\nfn test_all_core_metrics_registered() {\n let config = MiroirConfig::default();\n let metrics = Metrics::new(&config);\n\n // Add sample data to ensure metrics appear in output\n // Request metrics - recorded via telemetry_middleware in integration tests\n // Here we just verify the metrics are registered\n\n // Node metrics\n metrics.set_node_healthy(\"node-1\", true);\n metrics.record_node_request_duration(\"node-1\", \"search\", 0.05);\n metrics.inc_node_errors(\"node-1\", \"timeout\");\n\n // Shard metrics - use f64 for values\n metrics.set_shard_coverage(1.0);\n metrics.set_degraded_shards(0.0);\n metrics.set_shard_distribution(\"node-1\", 32.0);\n\n // Task metrics\n metrics.observe_task_processing_age(0.1);\n metrics.inc_tasks_total(\"completed\");\n metrics.set_task_registry_size(5.0);\n\n // Scatter-gather metrics\n metrics.record_scatter_fan_out(3);\n metrics.inc_scatter_partial_responses();\n metrics.inc_scatter_retries();\n\n // Rebalancer metrics\n metrics.set_rebalance_in_progress(false);\n metrics.inc_rebalance_documents_migrated(100);\n metrics.observe_rebalance_duration(10.0);\n\n let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n let output = encoded.as_str();\n\n // Verify all 18 core plan §10 metric names appear in the output\n // Check for either HELP, TYPE, or data lines for each metric\n let expected_metrics = [\n // Request metrics (3)\n \"miroir_request_duration_seconds\",\n \"miroir_requests_total\",\n \"miroir_requests_in_flight\",\n // Node health metrics (3)\n \"miroir_node_healthy\",\n \"miroir_node_request_duration_seconds\",\n \"miroir_node_errors_total\",\n // Shard metrics (3)\n \"miroir_shard_coverage\",\n \"miroir_degraded_shards_total\",\n \"miroir_shard_distribution\",\n // Task metrics (3)\n \"miroir_task_processing_age_seconds\",\n \"miroir_tasks_total\",\n \"miroir_task_registry_size\",\n // Scatter-gather metrics (3)\n \"miroir_scatter_fan_out_size\",\n \"miroir_scatter_partial_responses_total\",\n \"miroir_scatter_retries_total\",\n // Rebalancer metrics (3)\n \"miroir_rebalance_in_progress\",\n \"miroir_rebalance_documents_migrated_total\",\n \"miroir_rebalance_duration_seconds\",\n ];\n\n for name in &expected_metrics {\n // Check for HELP or TYPE line (metadata) OR data line for the metric\n let has_metadata = output.contains(&format!(\"# HELP {}\", name)) || output.contains(&format!(\"# TYPE {}\", name));\n let has_data = output.lines().any(|line| line.starts_with(name));\n assert!(\n has_metadata || has_data,\n \"missing core metric: {} (no HELP/TYPE metadata or data lines found)\\nOutput snippet:\\n{}\",\n name,\n output.lines().take(50).collect::>().join(\"\\n\")\n );\n }\n}\n\n#[test]\nfn test_scatter_fan_out_metric_records_correctly() {\n let config = MiroirConfig::default();\n let metrics = Metrics::new(&config);\n\n // Record a scatter operation that hit 3 nodes\n metrics.record_scatter_fan_out(3);\n\n let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n let output = encoded.as_str();\n\n // Verify the metric is present\n assert!(\n output.contains(\"miroir_scatter_fan_out_size\"),\n \"miroir_scatter_fan_out_size metric not found\"\n );\n\n // Verify the sample value is recorded (histogram should have a count > 0)\n // Check for the _count metric which shows total observations\n assert!(\n output.contains(\"miroir_scatter_fan_out_size_count\") &&\n output.lines().any(|line| line.contains(\"miroir_scatter_fan_out_size_count\") && !line.contains(\" 0\")),\n \"Expected histogram with non-zero count not found. Output:\\n{}\",\n output\n );\n}\n\n#[test]\nfn test_node_health_metrics_have_correct_labels() {\n let config = MiroirConfig::default();\n let metrics = Metrics::new(&config);\n\n // Set node health for two nodes\n metrics.set_node_healthy(\"node-1\", true);\n metrics.set_node_healthy(\"node-2\", false);\n\n let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n let output = encoded.as_str();\n\n // Verify node_id label is present and values are correct\n assert!(\n output.contains(\"miroir_node_healthy\") &&\n output.contains(\"node-1\") &&\n output.contains(\" 1\"),\n \"Expected node-1 healthy metric not found. Output:\\n{}\",\n output\n );\n assert!(\n output.contains(\"miroir_node_healthy\") &&\n output.contains(\"node-2\") &&\n output.contains(\" 0\"),\n \"Expected node-2 unhealthy metric not found. Output:\\n{}\",\n output\n );\n}\n\n#[test]\nfn test_node_request_duration_has_operation_label() {\n let config = MiroirConfig::default();\n let metrics = Metrics::new(&config);\n\n // Record a node request duration\n metrics.record_node_request_duration(\"node-1\", \"search\", 0.05);\n\n let encoded = metrics.encode_metrics().expect(\"failed to encode metrics\");\n let output = encoded.as_str();\n\n // Verify operation label is present (format may vary: \"node-1\",\"search\" or node_id=\"node-1\",operation=\"search\")\n assert!(\n output.contains(\"miroir_node_request_duration_seconds\") &&\n output.contains(\"node-1\") &&\n output.contains(\"search\"),\n \"Expected node request duration metric with node_id and operation labels not found. 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miroir\n12\tspec:\n13\t {{- if not .Values.hpa.enabled }}\n14\t replicas: {{ .Values.miroir.replicas }}\n15\t {{- end }}\n16\t selector:\n17\t matchLabels:\n18\t {{- include \"miroir.selectorLabels\" . | nindent 6 }}\n19\t app.kubernetes.io/component: miroir\n20\t template:\n21\t metadata:\n22\t annotations:\n23\t prometheus.io/scrape: \"true\"\n24\t prometheus.io/port: \"9090\"\n25\t prometheus.io/path: \"/metrics\"\n26\t {{- with .Values.miroir.podAnnotations }}\n27\t {{- toYaml . | nindent 8 }}\n28\t {{- end }}\n29\t labels:\n30\t {{- include \"miroir.selectorLabels\" . | nindent 8 }}\n31\t app.kubernetes.io/component: miroir\n32\t {{- with .Values.miroir.podLabels }}\n33\t {{- toYaml . | nindent 8 }}\n34\t {{- end }}\n35\t spec:\n36\t serviceAccountName: {{ include \"miroir.serviceAccountName\" . }}\n37\t securityContext:\n38\t runAsNonRoot: true\n39\t runAsUser: 1000\n40\t fsGroup: 1000\n41\t {{- if eq (include \"miroir.cdcPvcEnabled\" .) \"true\" }}\n42\t fsGroupChangePolicy: OnRootMismatch\n43\t {{- end }}\n44\t containers:\n45\t - name: miroir\n46\t securityContext:\n47\t allowPrivilegeEscalation: false\n48\t capabilities:\n49\t drop:\n50\t - ALL\n51\t readOnlyRootFilesystem: false\n52\t image: \"{{ .Values.miroir.image.repository }}:{{ .Values.miroir.image.tag | default .Chart.AppVersion }}\"\n53\t imagePullPolicy: {{ .Values.miroir.image.pullPolicy }}\n54\t ports:\n55\t - name: http\n56\t containerPort: 7700\n57\t protocol: TCP\n58\t - name: metrics\n59\t containerPort: 9090\n60\t protocol: TCP\n61\t env:\n62\t - name: POD_NAME\n63\t valueFrom:\n64\t fieldRef:\n65\t fieldPath: metadata.name\n66\t - name: POD_NAMESPACE\n67\t valueFrom:\n68\t fieldRef:\n69\t fieldPath: metadata.namespace\n70\t - name: MIROIR_CONFIG_PATH\n71\t value: /config/miroir.yaml\n72\t - name: MIROIR_MASTER_KEY\n73\t valueFrom:\n74\t secretKeyRef:\n75\t name: {{ include \"miroir.secretName\" . }}\n76\t key: masterKey\n77\t - name: MIROIR_NODE_MASTER_KEY\n78\t valueFrom:\n79\t secretKeyRef:\n80\t name: {{ include \"miroir.secretName\" . }}\n81\t key: nodeMasterKey\n82\t - name: MIROIR_ADMIN_API_KEY\n83\t valueFrom:\n84\t secretKeyRef:\n85\t name: {{ include \"miroir.secretName\" . }}\n86\t key: adminApiKey\n87\t - name: ADMIN_SESSION_SEAL_KEY\n88\t valueFrom:\n89\t secretKeyRef:\n90\t name: {{ include \"miroir.secretName\" . }}\n91\t key: adminSessionSealKey\n92\t optional: true\n93\t - name: SEARCH_UI_JWT_SECRET\n94\t valueFrom:\n95\t secretKeyRef:\n96\t name: {{ include \"miroir.secretName\" . }}\n97\t key: searchUiJwtSecret\n98\t optional: true\n99\t - name: SEARCH_UI_JWT_SECRET_PREVIOUS\n100\t valueFrom:\n101\t secretKeyRef:\n102\t name: {{ include \"miroir.secretName\" . }}\n103\t key: searchUiJwtSecretPrevious\n104\t optional: true\n105\t - name: SEARCH_UI_SHARED_KEY\n106\t valueFrom:\n107\t secretKeyRef:\n108\t name: {{ include \"miroir.secretName\" . }}\n109\t key: searchUiSharedKey\n110\t optional: true\n111\t - name: RUST_LOG\n112\t value: {{ .Values.miroir.logLevel | default \"info\" }}\n113\t {{- if and (eq (include \"miroir.redisEnabled\" .) \"true\") .Values.redis.auth.enabled }}\n114\t - name: MIROIR_REDIS_PASSWORD\n115\t valueFrom:\n116\t secretKeyRef:\n117\t name: {{ include \"miroir.redisSecretName\" . }}\n118\t key: redis-password\n119\t {{- end }}\n120\t volumeMounts:\n121\t - name: config\n122\t mountPath: /config\n123\t readOnly: true\n124\t - name: data\n125\t mountPath: /data\n126\t {{- if eq (include \"miroir.cdcPvcEnabled\" .) \"true\" }}\n127\t - name: cdc-buffer\n128\t mountPath: /data/cdc\n129\t {{- end }}\n130\t livenessProbe:\n131\t httpGet:\n132\t path: /health\n133\t port: http\n134\t initialDelaySeconds: 10\n135\t periodSeconds: 10\n136\t timeoutSeconds: 5\n137\t failureThreshold: 3\n138\t readinessProbe:\n139\t httpGet:\n140\t path: /_miroir/ready\n141\t port: http\n142\t initialDelaySeconds: 5\n143\t periodSeconds: 5\n144\t timeoutSeconds: 3\n145\t failureThreshold: 2\n146\t resources:\n147\t {{- toYaml .Values.miroir.resources | nindent 12 }}\n148\t volumes:\n149\t - name: config\n150\t configMap:\n151\t name: {{ include \"miroir.fullname\" . }}-config\n152\t - name: data\n153\t emptyDir: {}\n154\t {{- if eq (include \"miroir.cdcPvcEnabled\" .) \"true\" }}\n155\t - name: cdc-buffer\n156\t persistentVolumeClaim:\n157\t claimName: {{ include \"miroir.fullname\" . }}-cdc-pvc\n158\t {{- end }}\n159\t {{- with .Values.miroir.nodeSelector }}\n160\t nodeSelector:\n161\t {{- toYaml . | nindent 8 }}\n162\t {{- end }}\n163\t {{- with .Values.miroir.affinity }}\n164\t affinity:\n165\t {{- toYaml . | nindent 8 }}\n166\t {{- end }}\n167\t {{- with .Values.miroir.tolerations }}\n168\t tolerations:\n169\t {{- toYaml . | nindent 8 }}\n170\t {{- end }}\n171\t{{- end }}\n172\t"}]},"parent_tool_use_id":null,"session_id":"117cfbb2-d192-47e4-94cf-6ac9c9c2ff6a","uuid":"1848be3c-9c58-48a9-989e-da161a299da6","timestamp":"2026-05-23T05:04:39.276Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/charts/miroir/templates/miroir-deployment.yaml","content":"{{/*\nMiroir Deployment\n*/}}\n{{- if .Values.miroir.replicas }}\napiVersion: apps/v1\nkind: Deployment\nmetadata:\n name: {{ include \"miroir.fullname\" . }}-miroir\n labels:\n {{- include \"miroir.labels\" . | nindent 4 }}\n app.kubernetes.io/component: miroir\nspec:\n {{- if not .Values.hpa.enabled }}\n replicas: {{ .Values.miroir.replicas }}\n {{- end }}\n selector:\n matchLabels:\n {{- include \"miroir.selectorLabels\" . | nindent 6 }}\n app.kubernetes.io/component: miroir\n template:\n metadata:\n annotations:\n prometheus.io/scrape: \"true\"\n prometheus.io/port: \"9090\"\n prometheus.io/path: \"/metrics\"\n {{- with .Values.miroir.podAnnotations }}\n {{- toYaml . | nindent 8 }}\n {{- end }}\n labels:\n {{- include \"miroir.selectorLabels\" . | nindent 8 }}\n app.kubernetes.io/component: miroir\n {{- with .Values.miroir.podLabels }}\n {{- toYaml . | nindent 8 }}\n {{- end }}\n spec:\n serviceAccountName: {{ include \"miroir.serviceAccountName\" . }}\n securityContext:\n runAsNonRoot: true\n runAsUser: 1000\n fsGroup: 1000\n {{- if eq (include \"miroir.cdcPvcEnabled\" .) \"true\" }}\n fsGroupChangePolicy: OnRootMismatch\n {{- end }}\n containers:\n - name: miroir\n securityContext:\n allowPrivilegeEscalation: false\n capabilities:\n drop:\n - ALL\n readOnlyRootFilesystem: false\n image: \"{{ .Values.miroir.image.repository }}:{{ .Values.miroir.image.tag | default .Chart.AppVersion }}\"\n imagePullPolicy: {{ .Values.miroir.image.pullPolicy }}\n ports:\n - name: http\n containerPort: 7700\n protocol: TCP\n - name: metrics\n containerPort: 9090\n protocol: TCP\n env:\n - name: POD_NAME\n valueFrom:\n fieldRef:\n fieldPath: metadata.name\n - name: POD_NAMESPACE\n valueFrom:\n fieldRef:\n fieldPath: metadata.namespace\n - name: MIROIR_CONFIG_PATH\n value: /config/miroir.yaml\n - name: MIROIR_MASTER_KEY\n valueFrom:\n secretKeyRef:\n name: {{ include \"miroir.secretName\" . }}\n key: masterKey\n - name: MIROIR_NODE_MASTER_KEY\n valueFrom:\n secretKeyRef:\n name: {{ include \"miroir.secretName\" . }}\n key: nodeMasterKey\n - name: MIROIR_ADMIN_API_KEY\n valueFrom:\n secretKeyRef:\n name: {{ include \"miroir.secretName\" . }}\n key: adminApiKey\n - name: ADMIN_SESSION_SEAL_KEY\n valueFrom:\n secretKeyRef:\n name: {{ include \"miroir.secretName\" . }}\n key: adminSessionSealKey\n optional: true\n - name: SEARCH_UI_JWT_SECRET\n valueFrom:\n secretKeyRef:\n name: {{ include \"miroir.secretName\" . }}\n key: searchUiJwtSecret\n optional: true\n - name: SEARCH_UI_JWT_SECRET_PREVIOUS\n valueFrom:\n secretKeyRef:\n name: {{ include \"miroir.secretName\" . }}\n key: searchUiJwtSecretPrevious\n optional: true\n - name: SEARCH_UI_SHARED_KEY\n valueFrom:\n secretKeyRef:\n name: {{ include \"miroir.secretName\" . }}\n key: searchUiSharedKey\n optional: true\n - name: RUST_LOG\n value: {{ .Values.miroir.logLevel | default \"info\" }}\n {{- if and (eq (include \"miroir.redisEnabled\" .) \"true\") .Values.redis.auth.enabled }}\n - name: MIROIR_REDIS_PASSWORD\n valueFrom:\n secretKeyRef:\n name: {{ include \"miroir.redisSecretName\" . }}\n key: redis-password\n {{- end }}\n volumeMounts:\n - name: config\n mountPath: /config\n readOnly: true\n - name: data\n mountPath: /data\n {{- if eq (include \"miroir.cdcPvcEnabled\" .) \"true\" }}\n - name: cdc-buffer\n mountPath: /data/cdc\n {{- end }}\n livenessProbe:\n httpGet:\n path: /health\n port: http\n initialDelaySeconds: 10\n periodSeconds: 10\n timeoutSeconds: 5\n failureThreshold: 3\n readinessProbe:\n httpGet:\n path: /_miroir/ready\n port: http\n initialDelaySeconds: 5\n periodSeconds: 5\n timeoutSeconds: 3\n failureThreshold: 2\n resources:\n {{- toYaml .Values.miroir.resources | nindent 12 }}\n volumes:\n - name: config\n configMap:\n name: {{ include \"miroir.fullname\" . }}-config\n - name: data\n emptyDir: {}\n {{- if eq (include \"miroir.cdcPvcEnabled\" .) \"true\" }}\n - name: cdc-buffer\n persistentVolumeClaim:\n claimName: {{ include \"miroir.fullname\" . }}-cdc-pvc\n {{- end }}\n {{- with .Values.miroir.nodeSelector }}\n nodeSelector:\n {{- toYaml . | nindent 8 }}\n {{- end }}\n {{- with .Values.miroir.affinity }}\n affinity:\n {{- toYaml . | nindent 8 }}\n {{- end }}\n {{- with .Values.miroir.tolerations }}\n tolerations:\n {{- toYaml . | nindent 8 }}\n {{- end }}\n{{- end }}\n","numLines":172,"startLine":1,"totalLines":172}}} -{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_aa5393ac38f44bb8844840ca","type":"tool_result","content":"1\t{{/*\n2\tMiroir Headless Service for peer discovery\n3\t*/}}\n4\t{{- if .Values.miroir.replicas }}\n5\tapiVersion: v1\n6\tkind: Service\n7\tmetadata:\n8\t name: {{ include \"miroir.fullname\" . }}-headless\n9\t labels:\n10\t {{- include \"miroir.labels\" . | nindent 4 }}\n11\t app.kubernetes.io/component: miroir\n12\t {{- with .Values.headless.annotations }}\n13\t annotations:\n14\t {{- toYaml . | nindent 4 }}\n15\t {{- end }}\n16\tspec:\n17\t type: ClusterIP\n18\t clusterIP: None\n19\t ports:\n20\t - port: {{ .Values.service.ports.http | default 7700 }}\n21\t targetPort: http\n22\t protocol: TCP\n23\t name: http\n24\t selector:\n25\t {{- include \"miroir.selectorLabels\" . | nindent 4 }}\n26\t app.kubernetes.io/component: miroir\n27\t{{- end }}\n28\t"}]},"parent_tool_use_id":null,"session_id":"117cfbb2-d192-47e4-94cf-6ac9c9c2ff6a","uuid":"f71866d5-1cf7-44d9-a0c4-ab5ff0e5fedb","timestamp":"2026-05-23T05:04:39.277Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/charts/miroir/templates/miroir-headless.yaml","content":"{{/*\nMiroir Headless Service for peer discovery\n*/}}\n{{- if .Values.miroir.replicas }}\napiVersion: v1\nkind: Service\nmetadata:\n name: {{ include \"miroir.fullname\" . }}-headless\n labels:\n {{- include \"miroir.labels\" . | nindent 4 }}\n app.kubernetes.io/component: miroir\n {{- with .Values.headless.annotations }}\n annotations:\n {{- toYaml . | nindent 4 }}\n {{- end }}\nspec:\n type: ClusterIP\n clusterIP: None\n ports:\n - port: {{ .Values.service.ports.http | default 7700 }}\n targetPort: http\n protocol: TCP\n name: http\n selector:\n {{- include \"miroir.selectorLabels\" . | nindent 4 }}\n app.kubernetes.io/component: miroir\n{{- end }}\n","numLines":28,"startLine":1,"totalLines":28}}} -{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_9b6ae72b9dbb4d4494c0e947","type":"tool_result","content":"1\t# Miroir Helm Chart Values\n2\t# These defaults boot a working single-pod install for evaluation and CI.\n3\t# For production, override to: replicas=2+, replicationFactor=2, replicaGroups=2,\n4\t# taskStore.backend=redis, redis.enabled=true, hpa.enabled=true\n5\t#\n6\t# SECRET INVENTORY (plan §9):\n7\t# ┌──────────────────────────┬───────────────────────────────┬─────────────────────┐\n8\t# │ Secret │ Managed by │ Rotation │\n9\t# ├──────────────────────────┼───────────────────────────────┼─────────────────────┤\n10\t# │ masterKey │ Helm / ESO │ Manual key change │\n11\t# │ nodeMasterKey │ Helm / ESO │ Zero-downtime (§9) │\n12\t# │ MEILI_MASTER_KEY │ Helm / ESO │ Pod restart only │\n13\t# │ adminApiKey │ Helm / ESO │ Manual + restart │\n14\t# │ adminSessionSealKey │ Helm / ESO │ Manual + restart │\n15\t# │ searchUiJwtSecret │ Helm / ESO │ Zero-downtime (§9) │\n16\t# │ searchUiJwtSecretPrev │ Helm / ESO │ Overlap window │\n17\t# │ searchUiSharedKey │ Helm / ESO │ Manual + restart │\n18\t# │ redis_password │ Helm / ESO │ Manual + restart │\n19\t# │ ghcr_credentials │ Argo Workflows (CI only) │ Manual │\n20\t# │ github_token │ Argo Workflows (CI only) │ Manual │\n21\t# └──────────────────────────┴───────────────────────────────┴─────────────────────┘\n22\t# ghcr_credentials and github_token are NOT in this chart — they belong to the\n23\t# Argo Workflows service account in the iad-ci cluster (see CLAUDE.md CI/CD section).\n24\t# MEILI_MASTER_KEY is set at Meilisearch process start and cannot be rotated\n25\t# without a pod restart (documented in the Meilisearch docs).\n26\t\n27\tmiroir:\n28\t image:\n29\t repository: ghcr.io/jedarden/miroir\n30\t tag: \"\" # defaults to Chart.appVersion\n31\t pullPolicy: IfNotPresent\n32\t replicas: 1 # dev default: override to 2+ in production (requires taskStore.backend=redis)\n33\t shards: 64\n34\t replicationFactor: 1 # dev default: override to 2 in production\n35\t replicaGroups: 1 # dev default: override to 2 in production\n36\t masterKey: \"\" # auto-generated if empty; ignored when existingSecret is set\n37\t nodeMasterKey: \"\" # auto-generated if empty; admin-scoped key for Meilisearch nodes (plan §9 Model B)\n38\t adminApiKey: \"\" # auto-generated if empty; ignored when existingSecret is set\n39\t adminSessionSealKey: \"\" # 64-byte base64 key for sealing admin session cookies; auto-generated if empty (plan §9)\n40\t searchUiJwtSecret: \"\" # HMAC secret for search UI JWTs; auto-generated when search_ui.enabled=true (plan §9)\n41\t searchUiJwtSecretPrevious: \"\" # Previous JWT secret during rotation overlap window (plan §9)\n42\t searchUiSharedKey: \"\" # Shared key for X-Search-UI-Key header when search_ui.auth.mode=shared_key (plan §9)\n43\t logLevel: info # RUST_LOG: trace, debug, info, warn, error\n44\t existingSecret: \"\" # name of K8s Secret with masterKey, nodeMasterKey, adminApiKey\n45\t podAnnotations: {}\n46\t podLabels: {}\n47\t resources:\n48\t limits:\n49\t cpu: 2000m\n50\t memory: 3584Mi # 3.5 GiB (leaves headroom under 3.75 GB envelope)\n51\t requests:\n52\t cpu: 500m\n53\t memory: 1Gi\n54\t nodeSelector: {}\n55\t tolerations: []\n56\t affinity: {}\n57\t cdc:\n58\t enabled: true\n59\t emit_ttl_deletes: false\n60\t emit_internal_writes: false\n61\t buffer:\n62\t primary: memory # memory | pvc | redis\n63\t overflow: drop # drop | pvc | redis\n64\t pvc_size: 10Gi\n65\t pvc_storage_class: \"\"\n66\t memory_bytes: 67108864\n67\t # §14.8 Resource-aware configuration defaults\n68\t # All defaults sized for 2 vCPU / 3.75 GB envelope\n69\t server:\n70\t max_body_bytes: 104857600 # 100 MiB per request\n71\t max_concurrent_requests: 500\n72\t request_timeout_ms: 30000\n73\t connection_pool_per_node:\n74\t max_idle: 32\n75\t max_total: 128\n76\t idle_timeout_s: 60\n77\t task_registry:\n78\t cache_size: 10000\n79\t redis_pool_max: 50\n80\t ttl_seconds: 604800 # 7 days\n81\t prune_interval_s: 300\n82\t prune_batch_size: 10000\n83\t idempotency:\n84\t enabled: true\n85\t max_cached_keys: 1000000 # ~100 MB\n86\t ttl_seconds: 86400\n87\t session_pinning:\n88\t enabled: true\n89\t ttl_seconds: 900\n90\t max_sessions: 100000 # ~50 MB\n91\t wait_strategy: block # block | route_pin\n92\t max_wait_ms: 5000\n93\t query_coalescing:\n94\t enabled: true\n95\t window_ms: 50\n96\t max_subscribers: 1000\n97\t max_pending_queries: 10000\n98\t anti_entropy:\n99\t enabled: true\n100\t schedule: every 6h\n101\t shards_per_pass: 0 # 0 = all shards\n102\t max_read_concurrency: 2\n103\t fingerprint_batch_size: 1000\n104\t auto_repair: true\n105\t updated_at_field: _miroir_updated_at\n106\t resharding:\n107\t enabled: true\n108\t backfill_concurrency: 4\n109\t backfill_batch_size: 1000\n110\t throttle_docs_per_sec: 0 # 0 = no throttle\n111\t verify_before_swap: true\n112\t retain_old_index_hours: 48\n113\t allowed_windows: [] # e.g., [\"22:00-04:00 UTC\"]\n114\t peer_discovery:\n115\t service_name: miroir-headless\n116\t refresh_interval_s: 15\n117\t leader_election:\n118\t enabled: true # auto-true when replicas > 1\n119\t lease_ttl_s: 10\n120\t renew_interval_s: 3\n121\t\n122\tsearch_ui:\n123\t enabled: true\n124\t scoped_key_max_age_days: 60 # Maximum lifetime of a scoped Meilisearch key (days)\n125\t scoped_key_rotate_before_expiry_days: 30 # Rotate this many days before max_age (must be < max_age)\n126\t scoped_key_rotation_drain_s: 120 # Seconds to wait for all pods to observe new key before revoking old\n127\t\n128\tadmin_ui:\n129\t enabled: true\n130\t path: \"/_miroir/admin\"\n131\t auth: key # key | oauth (future) | none (dev only)\n132\t session_ttl_s: 3600 # 1 hour\n133\t read_only_mode: false\n134\t allowed_origins:\n135\t - \"same-origin\"\n136\t cors_allowed_origins: []\n137\t rate_limit:\n138\t per_ip: \"10/minute\" # Rate limit per source IP\n139\t backend: redis # redis | local (schema enforces redis when replicas > 1)\n140\t redis_key_prefix: \"miroir:ratelimit:adminlogin:\"\n141\t redis_ttl_s: 60\n142\t failed_attempt_threshold: 5 # Consecutive failures before exponential backoff\n143\t backoff_start_minutes: 10 # Initial backoff after threshold\n144\t backoff_max_hours: 24 # Maximum backoff cap\n145\t\n146\ttaskStore:\n147\t backend: sqlite # sqlite | redis\n148\t path: /data/miroir-tasks.db\n149\t url: \"\" # for redis: redis://host:6379\n150\t\n151\t# Horizontal Pod Autoscaler (disabled by default for dev)\n152\thpa:\n153\t enabled: false\n154\t minReplicas: 2\n155\t maxReplicas: 10\n156\t targetCPUUtilizationPercentage: 70\n157\t targetMemoryUtilizationPercentage: 80\n158\t behavior:\n159\t scaleDown:\n160\t stabilizationWindowSeconds: 300\n161\t policies:\n162\t - type: Percent\n163\t value: 50\n164\t periodSeconds: 60\n165\t scaleUp:\n166\t stabilizationWindowSeconds: 0\n167\t policies:\n168\t - type: Percent\n169\t value: 100\n170\t periodSeconds: 30\n171\t - type: Pods\n172\t value: 2\n173\t periodSeconds: 60\n174\t selectPolicy: Max\n175\t\n176\t# ServiceAccount\n177\tserviceAccount:\n178\t create: true\n179\t name: \"\" # defaults to release name\n180\t annotations: {}\n181\t\n182\t# Services\n183\tservice:\n184\t type: ClusterIP\n185\t annotations: {}\n186\t ports:\n187\t http: 7700\n188\t metrics: 9090\n189\t\n190\theadless:\n191\t annotations: {}\n192\t\n193\t# Meilisearch StatefulSet\n194\tmeilisearch:\n195\t enabled: true\n196\t image:\n197\t repository: getmeilisearch/meilisearch\n198\t tag: v1.12\n199\t pullPolicy: IfNotPresent\n200\t replicas: 2 # 1 group × 2 nodes (dev default)\n201\t nodesPerGroup: 2 # nodes per replica group\n202\t podAnnotations: {}\n203\t podLabels: {}\n204\t resources:\n205\t limits:\n206\t cpu: 2000m\n207\t memory: 2Gi\n208\t requests:\n209\t cpu: 500m\n210\t memory: 1Gi\n211\t nodeSelector: {}\n212\t tolerations: []\n213\t affinity: {}\n214\t persistence:\n215\t enabled: true\n216\t size: 10Gi\n217\t storageClass: \"\" # uses default storage class\n218\t env: []\n219\t masterKey: \"\" # defaults to auto-generated; NOT zero-downtime rotatable (fixed at process start)\n220\t\n221\t# Redis deployment (only when taskStore.backend=redis)\n222\tredis:\n223\t enabled: false # dev default: enable for production\n224\t image:\n225\t repository: redis\n226\t tag: 7.4-alpine\n227\t pullPolicy: IfNotPresent\n228\t replicas: 1\n229\t podAnnotations: {}\n230\t podLabels: {}\n231\t resources:\n232\t limits:\n233\t cpu: 500m\n234\t memory: 512Mi\n235\t requests:\n236\t cpu: 100m\n237\t memory: 128Mi\n238\t nodeSelector: {}\n239\t tolerations: []\n240\t affinity: {}\n241\t persistence:\n242\t enabled: true\n243\t size: 5Gi\n244\t storageClass: \"\"\n245\t service:\n246\t type: ClusterIP\n247\t port: 6379\n248\t auth:\n249\t enabled: true\n250\t existingSecret: \"\" # auto-generated as -redis-secret when empty; password comes from K8s Secret or ESO\n251\t\n252\t# Prometheus Operator integration (plan §10 + §14.9)\n253\tserviceMonitor:\n254\t enabled: false # requires prometheus-operator in cluster\n255\t interval: 30s\n256\t annotations: {}\n257\t\n258\tprometheusRule:\n259\t enabled: false # requires prometheus-operator in cluster\n260\t annotations: {}\n261\t\n262\t# Grafana dashboard ConfigMap (requires grafana-dashboard sidecar)\n263\tdashboards:\n264\t enabled: false # creates a ConfigMap labeled grafana_dashboard=1\n265\t annotations: {}\n266\t\n267\t# OpenTelemetry tracing (plan §10)\n268\ttracing:\n269\t enabled: false # disabled by default for zero overhead\n270\t endpoint: \"http://tempo.monitoring.svc:4317\" # OTLP gRPC endpoint\n271\t serviceName: \"miroir\" # service name for trace identification\n272\t sampleRate: 0.1 # head-based sampling: 0.1 = ~10% of requests traced\n273\t\n274\t# External Secrets Operator integration (plan §6 + §9)\n275\t# When enabled, ESO pulls secrets from OpenBao via ClusterSecretStore.\n276\t# Set miroir.existingSecret to \"-secret\" to use the ESO-managed Secret.\n277\teso:\n278\t enabled: false # disabled by default; enable for production with OpenBao\n279\t refreshInterval: \"15m\" # how often ESO re-syncs from the backend\n280\t secretStoreRef:\n281\t name: \"openbao-backend\" # ClusterSecretStore name in the cluster\n282\t kind: \"ClusterSecretStore\"\n283\t secretPath: \"kv/search/miroir\" # OpenBao KV v2 path\n284\t includePreviousJwt: false # set true during JWT rotation overlap window\n285\t includeSharedKey: false # set true when search_ui.auth.mode=shared_key\n286\t includeRedisPassword: false # set true when redis.auth.enabled=true\n287\t"}]},"parent_tool_use_id":null,"session_id":"117cfbb2-d192-47e4-94cf-6ac9c9c2ff6a","uuid":"beaf2d15-8e2a-4069-95c8-4368343268f1","timestamp":"2026-05-23T05:04:39.278Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/charts/miroir/values.yaml","content":"# Miroir Helm Chart Values\n# These defaults boot a working single-pod install for evaluation and CI.\n# For production, override to: replicas=2+, replicationFactor=2, replicaGroups=2,\n# taskStore.backend=redis, redis.enabled=true, hpa.enabled=true\n#\n# SECRET INVENTORY (plan §9):\n# ┌──────────────────────────┬───────────────────────────────┬─────────────────────┐\n# │ Secret │ Managed by │ Rotation │\n# ├──────────────────────────┼───────────────────────────────┼─────────────────────┤\n# │ masterKey │ Helm / ESO │ Manual key change │\n# │ nodeMasterKey │ Helm / ESO │ Zero-downtime (§9) │\n# │ MEILI_MASTER_KEY │ Helm / ESO │ Pod restart only │\n# │ adminApiKey │ Helm / ESO │ Manual + restart │\n# │ adminSessionSealKey │ Helm / ESO │ Manual + restart │\n# │ searchUiJwtSecret │ Helm / ESO │ Zero-downtime (§9) │\n# │ searchUiJwtSecretPrev │ Helm / ESO │ Overlap window │\n# │ searchUiSharedKey │ Helm / ESO │ Manual + restart │\n# │ redis_password │ Helm / ESO │ Manual + restart │\n# │ ghcr_credentials │ Argo Workflows (CI only) │ Manual │\n# │ github_token │ Argo Workflows (CI only) │ Manual │\n# └──────────────────────────┴───────────────────────────────┴─────────────────────┘\n# ghcr_credentials and github_token are NOT in this chart — they belong to the\n# Argo Workflows service account in the iad-ci cluster (see CLAUDE.md CI/CD section).\n# MEILI_MASTER_KEY is set at Meilisearch process start and cannot be rotated\n# without a pod restart (documented in the Meilisearch docs).\n\nmiroir:\n image:\n repository: ghcr.io/jedarden/miroir\n tag: \"\" # defaults to Chart.appVersion\n pullPolicy: IfNotPresent\n replicas: 1 # dev default: override to 2+ in production (requires taskStore.backend=redis)\n shards: 64\n replicationFactor: 1 # dev default: override to 2 in production\n replicaGroups: 1 # dev default: override to 2 in production\n masterKey: \"\" # auto-generated if empty; ignored when existingSecret is set\n nodeMasterKey: \"\" # auto-generated if empty; admin-scoped key for Meilisearch nodes (plan §9 Model B)\n adminApiKey: \"\" # auto-generated if empty; ignored when existingSecret is set\n adminSessionSealKey: \"\" # 64-byte base64 key for sealing admin session cookies; auto-generated if empty (plan §9)\n searchUiJwtSecret: \"\" # HMAC secret for search UI JWTs; auto-generated when search_ui.enabled=true (plan §9)\n searchUiJwtSecretPrevious: \"\" # Previous JWT secret during rotation overlap window (plan §9)\n searchUiSharedKey: \"\" # Shared key for X-Search-UI-Key header when search_ui.auth.mode=shared_key (plan §9)\n logLevel: info # RUST_LOG: trace, debug, info, warn, error\n existingSecret: \"\" # name of K8s Secret with masterKey, nodeMasterKey, adminApiKey\n podAnnotations: {}\n podLabels: {}\n resources:\n limits:\n cpu: 2000m\n memory: 3584Mi # 3.5 GiB (leaves headroom under 3.75 GB envelope)\n requests:\n cpu: 500m\n memory: 1Gi\n nodeSelector: {}\n tolerations: []\n affinity: {}\n cdc:\n enabled: true\n emit_ttl_deletes: false\n emit_internal_writes: false\n buffer:\n primary: memory # memory | pvc | redis\n overflow: drop # drop | pvc | redis\n pvc_size: 10Gi\n pvc_storage_class: \"\"\n memory_bytes: 67108864\n # §14.8 Resource-aware configuration defaults\n # All defaults sized for 2 vCPU / 3.75 GB envelope\n server:\n max_body_bytes: 104857600 # 100 MiB per request\n max_concurrent_requests: 500\n request_timeout_ms: 30000\n connection_pool_per_node:\n max_idle: 32\n max_total: 128\n idle_timeout_s: 60\n task_registry:\n cache_size: 10000\n redis_pool_max: 50\n ttl_seconds: 604800 # 7 days\n prune_interval_s: 300\n prune_batch_size: 10000\n idempotency:\n enabled: true\n max_cached_keys: 1000000 # ~100 MB\n ttl_seconds: 86400\n session_pinning:\n enabled: true\n ttl_seconds: 900\n max_sessions: 100000 # ~50 MB\n wait_strategy: block # block | route_pin\n max_wait_ms: 5000\n query_coalescing:\n enabled: true\n window_ms: 50\n max_subscribers: 1000\n max_pending_queries: 10000\n anti_entropy:\n enabled: true\n schedule: every 6h\n shards_per_pass: 0 # 0 = all shards\n max_read_concurrency: 2\n fingerprint_batch_size: 1000\n auto_repair: true\n updated_at_field: _miroir_updated_at\n resharding:\n enabled: true\n backfill_concurrency: 4\n backfill_batch_size: 1000\n throttle_docs_per_sec: 0 # 0 = no throttle\n verify_before_swap: true\n retain_old_index_hours: 48\n allowed_windows: [] # e.g., [\"22:00-04:00 UTC\"]\n peer_discovery:\n service_name: miroir-headless\n refresh_interval_s: 15\n leader_election:\n enabled: true # auto-true when replicas > 1\n lease_ttl_s: 10\n renew_interval_s: 3\n\nsearch_ui:\n enabled: true\n scoped_key_max_age_days: 60 # Maximum lifetime of a scoped Meilisearch key (days)\n scoped_key_rotate_before_expiry_days: 30 # Rotate this many days before max_age (must be < max_age)\n scoped_key_rotation_drain_s: 120 # Seconds to wait for all pods to observe new key before revoking old\n\nadmin_ui:\n enabled: true\n path: \"/_miroir/admin\"\n auth: key # key | oauth (future) | none (dev only)\n session_ttl_s: 3600 # 1 hour\n read_only_mode: false\n allowed_origins:\n - \"same-origin\"\n cors_allowed_origins: []\n rate_limit:\n per_ip: \"10/minute\" # Rate limit per source IP\n backend: redis # redis | local (schema enforces redis when replicas > 1)\n redis_key_prefix: \"miroir:ratelimit:adminlogin:\"\n redis_ttl_s: 60\n failed_attempt_threshold: 5 # Consecutive failures before exponential backoff\n backoff_start_minutes: 10 # Initial backoff after threshold\n backoff_max_hours: 24 # Maximum backoff cap\n\ntaskStore:\n backend: sqlite # sqlite | redis\n path: /data/miroir-tasks.db\n url: \"\" # for redis: redis://host:6379\n\n# Horizontal Pod Autoscaler (disabled by default for dev)\nhpa:\n enabled: false\n minReplicas: 2\n maxReplicas: 10\n targetCPUUtilizationPercentage: 70\n targetMemoryUtilizationPercentage: 80\n behavior:\n scaleDown:\n stabilizationWindowSeconds: 300\n policies:\n - type: Percent\n value: 50\n periodSeconds: 60\n scaleUp:\n stabilizationWindowSeconds: 0\n policies:\n - type: Percent\n value: 100\n periodSeconds: 30\n - type: Pods\n value: 2\n periodSeconds: 60\n selectPolicy: Max\n\n# ServiceAccount\nserviceAccount:\n create: true\n name: \"\" # defaults to release name\n annotations: {}\n\n# Services\nservice:\n type: ClusterIP\n annotations: {}\n ports:\n http: 7700\n metrics: 9090\n\nheadless:\n annotations: {}\n\n# Meilisearch StatefulSet\nmeilisearch:\n enabled: true\n image:\n repository: getmeilisearch/meilisearch\n tag: v1.12\n pullPolicy: IfNotPresent\n replicas: 2 # 1 group × 2 nodes (dev default)\n nodesPerGroup: 2 # nodes per replica group\n podAnnotations: {}\n podLabels: {}\n resources:\n limits:\n cpu: 2000m\n memory: 2Gi\n requests:\n cpu: 500m\n memory: 1Gi\n nodeSelector: {}\n tolerations: []\n affinity: {}\n persistence:\n enabled: true\n size: 10Gi\n storageClass: \"\" # uses default storage class\n env: []\n masterKey: \"\" # defaults to auto-generated; NOT zero-downtime rotatable (fixed at process start)\n\n# Redis deployment (only when taskStore.backend=redis)\nredis:\n enabled: false # dev default: enable for production\n image:\n repository: redis\n tag: 7.4-alpine\n pullPolicy: IfNotPresent\n replicas: 1\n podAnnotations: {}\n podLabels: {}\n resources:\n limits:\n cpu: 500m\n memory: 512Mi\n requests:\n cpu: 100m\n memory: 128Mi\n nodeSelector: {}\n tolerations: []\n affinity: {}\n persistence:\n enabled: true\n size: 5Gi\n storageClass: \"\"\n service:\n type: ClusterIP\n port: 6379\n auth:\n enabled: true\n existingSecret: \"\" # auto-generated as -redis-secret when empty; password comes from K8s Secret or ESO\n\n# Prometheus Operator integration (plan §10 + §14.9)\nserviceMonitor:\n enabled: false # requires prometheus-operator in cluster\n interval: 30s\n annotations: {}\n\nprometheusRule:\n enabled: false # requires prometheus-operator in cluster\n annotations: {}\n\n# Grafana dashboard ConfigMap (requires grafana-dashboard sidecar)\ndashboards:\n enabled: false # creates a ConfigMap labeled grafana_dashboard=1\n annotations: {}\n\n# OpenTelemetry tracing (plan §10)\ntracing:\n enabled: false # disabled by default for zero overhead\n endpoint: \"http://tempo.monitoring.svc:4317\" # OTLP gRPC endpoint\n serviceName: \"miroir\" # service name for trace identification\n sampleRate: 0.1 # head-based sampling: 0.1 = ~10% of requests traced\n\n# External Secrets Operator integration (plan §6 + §9)\n# When enabled, ESO pulls secrets from OpenBao via ClusterSecretStore.\n# Set miroir.existingSecret to \"-secret\" to use the ESO-managed Secret.\neso:\n enabled: false # disabled by default; enable for production with OpenBao\n refreshInterval: \"15m\" # how often ESO re-syncs from the backend\n secretStoreRef:\n name: \"openbao-backend\" # ClusterSecretStore name in the cluster\n kind: \"ClusterSecretStore\"\n secretPath: \"kv/search/miroir\" # OpenBao KV v2 path\n includePreviousJwt: false # set true during JWT rotation overlap window\n includeSharedKey: false # set true when search_ui.auth.mode=shared_key\n includeRedisPassword: false # set true when redis.auth.enabled=true\n","numLines":287,"startLine":1,"totalLines":287}}} -{"type":"system","subtype":"status","status":"requesting","uuid":"2a471f05-79fa-4465-b7ca-8eead426f778","session_id":"117cfbb2-d192-47e4-94cf-6ac9c9c2ff6a"} 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(`miroir-headless.yaml`): Already exists and looks correct. It has `clusterIP: None` and the correct selector.\n\n2. **Deployment** (`miroir-deployment.yaml`): Already injects `POD_NAME` and `POD_NAMESPACE` but not `POD_IP`. I need to add `POD_IP`.\n\n3. **Values.yaml**: Already has `peer_discovery` section with `service_name` and `refresh_interval_s`.\n\nNow I need to implement the Rust side:\n- Create `peer_discovery.rs` module\n- Add peer discovery logic with SRV lookup\n- Add metrics for peer pod count\n- Wire it into the main application\n\nLet me explore the Rust code structure first.","signature":""}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":null,"session_id":"117cfbb2-d192-47e4-94cf-6ac9c9c2ff6a","uuid":"d647d696-a6f2-4cba-a90d-79fcfdb707f3"} -{"type":"stream_event","event":{"type":"content_block_stop","index":0},"session_id":"117cfbb2-d192-47e4-94cf-6ac9c9c2ff6a","parent_tool_use_id":null,"uuid":"62482ca7-2d6d-4601-8e18-663f7b8a7d6e"} 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\"0.9\"\n13\ttwox-hash = \"2\"\n14\tthiserror = { workspace = true }\n15\ttracing = { workspace = true }\n16\tuuid = { version = \"1\", features = [\"v4\", \"serde\"] }\n17\tconfig = \"0.14\"\n18\trusqlite = { workspace = true }\n19\tfutures-util = \"0.3\"\n20\t# Redis support (optional — enable via `redis-store` feature)\n21\tredis = { version = \"0.27\", features = [\"aio\", \"tokio-comp\", \"connection-manager\"], optional = true }\n22\thex = \"0.4\"\n23\ttokio = { version = \"1\", features = [\"rt\", \"rt-multi-thread\", \"time\", \"sync\", \"macros\"] }\n24\tasync-trait = \"0.1\"\n25\trand = \"0.8\"\n26\treqwest = { version = \"0.12\", features = [\"json\"], default-features = false }\n27\turlencoding = \"2\"\n28\tsha2 = \"0.10\"\n29\tindexmap = \"2\"\n30\tchrono = { version = \"0.4\", features = [\"serde\"] }\n31\tregex = \"1\"\n32\ttrust-dns-resolver = { version = \"0.12\", features = [\"tokio-runtime\"] }\n33\t# Axum integration (optional — enable via `axum` feature)\n34\taxum = { version = \"0.7\", optional = true }\n35\t\n36\t# Raft prototype (P12.OP2 research) — not for production use\n37\t# openraft 0.9.22 fails on stable Rust 1.87 (validit uses let_chains).\n38\t# The prototype simulates Raft; only bincode is needed for serialization benchmarks.\n39\tbincode = { version = \"2\", features = [\"serde\"], optional = true }\n40\t\n41\t[features]\n42\tdefault = []\n43\traft-proto = [\"bincode\"]\n44\tredis-store = [\"redis\"]\n45\taxum = [\"dep:axum\"]\n46\t# Enable when openraft compiles on stable Rust:\n47\t# raft-full = [\"openraft\", \"bincode\"]\n48\t# (openraft dep removed from manifest — restore when upstream fixes let_chains on stable)\n49\t\n50\t[[bin]]\n51\tname = \"bench-reshard-load\"\n52\tpath = \"benches/reshard_load.rs\"\n53\t\n54\t[[bench]]\n55\tname = \"merger_bench\"\n56\tharness = false\n57\t\n58\t[[bench]]\n59\tname = \"router_bench\"\n60\tharness = false\n61\t\n62\t[[bench]]\n63\tname = \"dfs_preflight_bench\"\n64\tharness = false\n65\t\n66\t[dev-dependencies]\n67\ttempfile = \"3\"\n68\tproptest = \"1\"\n69\tcriterion = \"0.5\"\n70\ttokio = { version = \"1\", features = [\"rt\", \"macros\", \"time\"] }\n71\ttestcontainers = \"0.23\"\n72\ttestcontainers-modules = { version = \"0.11\", features = [\"redis\"] }\n73\t"}]},"parent_tool_use_id":null,"session_id":"117cfbb2-d192-47e4-94cf-6ac9c9c2ff6a","uuid":"d39b5b97-9937-48be-b32d-f24ef45628f8","timestamp":"2026-05-23T05:04:45.314Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/crates/miroir-core/Cargo.toml","content":"[package]\nname = \"miroir-core\"\nversion.workspace = true\nedition.workspace = true\nlicense.workspace = true\nrepository.workspace = true\nautobenches = false\n\n[dependencies]\nserde = { workspace = true }\nserde_json = { workspace = true }\nserde_yaml = \"0.9\"\ntwox-hash = \"2\"\nthiserror = { workspace = true }\ntracing = { workspace = true }\nuuid = { version = \"1\", features = [\"v4\", \"serde\"] }\nconfig = \"0.14\"\nrusqlite = { workspace = true }\nfutures-util = \"0.3\"\n# Redis support (optional — enable via `redis-store` feature)\nredis = { version = \"0.27\", features = [\"aio\", \"tokio-comp\", \"connection-manager\"], optional = true }\nhex = \"0.4\"\ntokio = { version = \"1\", features = [\"rt\", \"rt-multi-thread\", \"time\", \"sync\", \"macros\"] }\nasync-trait = \"0.1\"\nrand = \"0.8\"\nreqwest = { version = \"0.12\", features = [\"json\"], default-features = false }\nurlencoding = \"2\"\nsha2 = \"0.10\"\nindexmap = \"2\"\nchrono = { version = \"0.4\", features = [\"serde\"] }\nregex = \"1\"\ntrust-dns-resolver = { version = \"0.12\", features = [\"tokio-runtime\"] }\n# Axum integration (optional — enable via `axum` feature)\naxum = { version = \"0.7\", optional = true }\n\n# Raft prototype (P12.OP2 research) — not for production use\n# openraft 0.9.22 fails on stable Rust 1.87 (validit uses let_chains).\n# The prototype simulates Raft; only bincode is needed for serialization benchmarks.\nbincode = { version = \"2\", features = [\"serde\"], optional = true }\n\n[features]\ndefault = []\nraft-proto = [\"bincode\"]\nredis-store = [\"redis\"]\naxum = [\"dep:axum\"]\n# Enable when openraft compiles on stable Rust:\n# raft-full = [\"openraft\", \"bincode\"]\n# (openraft dep removed from manifest — restore when upstream fixes let_chains on stable)\n\n[[bin]]\nname = \"bench-reshard-load\"\npath = \"benches/reshard_load.rs\"\n\n[[bench]]\nname = \"merger_bench\"\nharness = false\n\n[[bench]]\nname = \"router_bench\"\nharness = false\n\n[[bench]]\nname = \"dfs_preflight_bench\"\nharness = false\n\n[dev-dependencies]\ntempfile = \"3\"\nproptest = \"1\"\ncriterion = \"0.5\"\ntokio = { version = \"1\", features = [\"rt\", \"macros\", \"time\"] }\ntestcontainers = \"0.23\"\ntestcontainers-modules = { version = \"0.11\", features = [\"redis\"] }\n","numLines":73,"startLine":1,"totalLines":73}}} -{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_749b0cf46c2a49dd9c950882","type":"tool_result","content":"1\t//! Miroir core library\n2\t//!\n3\t//! Provides routing, merging, and topology logic for the Miroir distributed search proxy.\n4\t\n5\tpub mod alias;\n6\tpub mod anti_entropy;\n7\tpub mod api_error;\n8\tpub mod canary;\n9\tpub mod cdc;\n10\tpub mod config;\n11\tpub mod drift_reconciler;\n12\tpub mod dump;\n13\tpub mod dump_import;\n14\tpub mod error;\n15\tpub mod explainer;\n16\tpub mod hedging;\n17\tpub mod idempotency;\n18\tpub mod ilm;\n19\tpub mod merger;\n20\tpub mod migration;\n21\tpub mod peer_discovery;\n22\tpub mod multi_search;\n23\tpub mod query_planner;\n24\tpub mod rebalancer;\n25\tpub mod rebalancer_worker;\n26\tpub mod replica_selection;\n27\tpub mod reshard;\n28\tpub mod router;\n29\tpub mod schema_migrations;\n30\tpub mod scatter;\n31\tpub mod session_pinning;\n32\tpub mod settings;\n33\tpub mod shadow;\n34\tpub mod task;\n35\tpub mod task_pruner;\n36\tpub mod task_registry;\n37\tpub mod task_store;\n38\tpub mod tenant;\n39\tpub mod topology;\n40\tpub mod ttl;\n41\t\n42\t#[cfg(feature = \"raft-proto\")]\n43\tpub mod raft_proto;\n44\t\n45\t// Public re-exports\n46\tpub use api_error::{ErrorType, MeilisearchError, MiroirCode};\n47\tpub use error::{MiroirError, Result};\n48\t"}]},"parent_tool_use_id":null,"session_id":"117cfbb2-d192-47e4-94cf-6ac9c9c2ff6a","uuid":"2dea334f-d664-4d86-b9d4-80f68cfb4b1e","timestamp":"2026-05-23T05:04:45.316Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/crates/miroir-core/src/lib.rs","content":"//! Miroir core library\n//!\n//! Provides routing, merging, and topology logic for the Miroir distributed search proxy.\n\npub mod alias;\npub mod anti_entropy;\npub mod api_error;\npub mod canary;\npub mod cdc;\npub mod config;\npub mod drift_reconciler;\npub mod dump;\npub mod dump_import;\npub mod error;\npub mod explainer;\npub mod hedging;\npub mod idempotency;\npub mod ilm;\npub mod merger;\npub mod migration;\npub mod peer_discovery;\npub mod multi_search;\npub mod query_planner;\npub mod rebalancer;\npub mod rebalancer_worker;\npub mod replica_selection;\npub mod reshard;\npub mod router;\npub mod schema_migrations;\npub mod scatter;\npub mod session_pinning;\npub mod settings;\npub mod shadow;\npub mod task;\npub mod task_pruner;\npub mod task_registry;\npub mod task_store;\npub mod tenant;\npub mod topology;\npub mod ttl;\n\n#[cfg(feature = \"raft-proto\")]\npub mod raft_proto;\n\n// Public re-exports\npub use api_error::{ErrorType, MeilisearchError, MiroirCode};\npub use error::{MiroirError, Result};\n","numLines":48,"startLine":1,"totalLines":48}}} -{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_9f3cd96e6b294b8485353aca","type":"tool_result","content":"1\tuse axum::{\n2\t extract::FromRef,\n3\t routing::{get, post},\n4\t Router,\n5\t};\n6\tuse miroir_core::{\n7\t config::MiroirConfig,\n8\t peer_discovery::PeerDiscovery,\n9\t rebalancer_worker::{RebalancerWorker, RebalancerWorkerConfig, TopologyChangeEvent},\n10\t task_pruner,\n11\t topology::{NodeStatus, Topology},\n12\t};\n13\tuse std::net::SocketAddr;\n14\tuse std::time::Duration;\n15\tuse tokio::signal;\n16\tuse tracing::{error, info};\n17\tuse tracing_subscriber::{EnvFilter, layer::SubscriberExt, registry, util::SubscriberInitExt};\n18\t\n19\tmod admin_session;\n20\tmod auth;\n21\tmod client;\n22\tmod middleware;\n23\tmod otel;\n24\tmod routes;\n25\tmod scoped_key_rotation;\n26\t\n27\tuse admin_session::SealKey;\n28\tuse auth::AuthState;\n29\tuse miroir_core::{\n30\t canary::{CanaryAssertion, CanaryRunner, CapturedQuery, QueryCapture, SearchQuery, SearchResponse},\n31\t task_store::TaskStore,\n32\t};\n33\tuse middleware::{Metrics, metrics_router, TelemetryState};\n34\tuse routes::{\n35\t admin, admin_endpoints, explain, health, indexes, keys, multi_search, search, settings, tasks, version,\n36\t};\n37\tuse scoped_key_rotation::ScopedKeyRotationState;\n38\tuse std::sync::Arc;\n39\t\n40\t/// Unified application state containing all shared state.\n41\t#[derive(Clone)]\n42\tstruct UnifiedState {\n43\t auth: AuthState,\n44\t metrics: Metrics,\n45\t admin: admin_endpoints::AppState,\n46\t pod_id: String,\n47\t redis_store: Option,\n48\t query_capture: Arc,\n49\t peer_discovery: Option>,\n50\t}\n51\t\n52\timpl UnifiedState {\n53\t fn new(config: MiroirConfig) -> Self {\n54\t let metrics = Metrics::new(&config);\n55\t\n56\t let master_key = std::env::var(\"MIROIR_MASTER_KEY\")\n57\t .unwrap_or_else(|_| config.master_key.clone());\n58\t\n59\t let admin_key = std::env::var(\"MIROIR_ADMIN_API_KEY\")\n60\t .unwrap_or_else(|_| config.admin.api_key.clone());\n61\t\n62\t let jwt_primary = if config.search_ui.enabled {\n63\t std::env::var(&config.search_ui.auth.jwt_secret_env).ok()\n64\t } else {\n65\t None\n66\t };\n67\t\n68\t let jwt_previous = std::env::var(&config.search_ui.auth.jwt_secret_previous_env)\n69\t .ok()\n70\t .filter(|v| !v.is_empty());\n71\t\n72\t let seal_key = SealKey::from_env_or_generate();\n73\t\n74\t // Set the key-generated gauge before constructing AuthState\n75\t // so the metric is accurate from the first scrape.\n76\t metrics.admin_session_key_generated().set(if seal_key.is_generated() { 1.0 } else { 0.0 });\n77\t\n78\t let pod_id = std::env::var(\"POD_NAME\").unwrap_or_else(|_| \"unknown\".to_string());\n79\t let namespace = std::env::var(\"POD_NAMESPACE\").unwrap_or_else(|_| \"default\".to_string());\n80\t\n81\t // Create peer discovery instance (plan §14.5)\n82\t // Only enabled when running in Kubernetes (POD_NAME is set to a real pod name)\n83\t let peer_discovery = if pod_id != \"unknown\" {\n84\t Some(Arc::new(PeerDiscovery::new(\n85\t pod_id.clone(),\n86\t namespace,\n87\t config.peer_discovery.service_name.clone(),\n88\t )))\n89\t } else {\n90\t None\n91\t };\n92\t\n93\t // Create Redis task store if backend is redis (must happen before AppState\n94\t // so redis_store and pod_id are available to admin endpoints).\n95\t let redis_store = if config.task_store.backend == \"redis\" && !config.task_store.url.is_empty() {\n96\t let url = config.task_store.url.clone();\n97\t Some(\n98\t tokio::task::block_in_place(|| {\n99\t tokio::runtime::Handle::current().block_on(\n100\t miroir_core::task_store::RedisTaskStore::open(&url)\n101\t )\n102\t })\n103\t .expect(\"Failed to connect to Redis for scoped key rotation\"),\n104\t )\n105\t } else {\n106\t None\n107\t };\n108\t\n109\t let auth = AuthState {\n110\t master_key,\n111\t admin_key: admin_key.clone(),\n112\t jwt_primary,\n113\t jwt_previous,\n114\t seal_key: seal_key.clone(),\n115\t revoked_sessions: std::sync::Arc::new(dashmap::DashMap::new()),\n116\t admin_session_revoked_total: metrics.admin_session_revoked_total(),\n117\t };\n118\t\n119\t let admin = admin_endpoints::AppState::with_redis(\n120\t config.clone(),\n121\t metrics.clone(),\n122\t redis_store.clone(),\n123\t pod_id.clone(),\n124\t seal_key.clone(),\n125\t );\n126\t\n127\t Self {\n128\t auth,\n129\t metrics,\n130\t admin,\n131\t pod_id,\n132\t redis_store,\n133\t query_capture: Arc::new(QueryCapture::new(1000)),\n134\t peer_discovery,\n135\t }\n136\t }\n137\t}\n138\t\n139\t// Implement FromRef so that admin_endpoints::AppState can be extracted from UnifiedState\n140\timpl FromRef for admin_endpoints::AppState {\n141\t fn from_ref(state: &UnifiedState) -> Self {\n142\t Self {\n143\t config: state.admin.config.clone(),\n144\t topology: state.admin.topology.clone(),\n145\t ready: state.admin.ready.clone(),\n146\t metrics: state.admin.metrics.clone(),\n147\t version_state: state.admin.version_state.clone(),\n148\t task_registry: state.admin.task_registry.clone(),\n149\t redis_store: state.redis_store.clone(),\n150\t task_store: state.admin.task_store.clone(),\n151\t pod_id: state.pod_id.clone(),\n152\t seal_key: state.auth.seal_key.clone(),\n153\t local_rate_limiter: admin_endpoints::LocalAdminRateLimiter::new(),\n154\t local_search_ui_rate_limiter: admin_endpoints::LocalSearchUiRateLimiter::new(),\n155\t rebalancer: state.admin.rebalancer.clone(),\n156\t migration_coordinator: state.admin.migration_coordinator.clone(),\n157\t rebalancer_worker: state.admin.rebalancer_worker.clone(),\n158\t rebalancer_metrics: state.admin.rebalancer_metrics.clone(),\n159\t previous_docs_migrated: state.admin.previous_docs_migrated.clone(),\n160\t settings_broadcast: state.admin.settings_broadcast.clone(),\n161\t drift_reconciler: state.admin.drift_reconciler.clone(),\n162\t session_manager: state.admin.session_manager.clone(),\n163\t alias_registry: state.admin.alias_registry.clone(),\n164\t }\n165\t }\n166\t}\n167\t\n168\t// Implement FromRef so that TelemetryState can be extracted from UnifiedState\n169\timpl FromRef for TelemetryState {\n170\t fn from_ref(state: &UnifiedState) -> Self {\n171\t TelemetryState {\n172\t metrics: state.metrics.clone(),\n173\t pod_id: state.pod_id.clone(),\n174\t }\n175\t }\n176\t}\n177\t\n178\t// Implement FromRef so that CsrfState can be extracted from UnifiedState\n179\timpl FromRef for auth::CsrfState {\n180\t fn from_ref(state: &UnifiedState) -> Self {\n181\t auth::CsrfState {\n182\t auth: state.auth.clone(),\n183\t redis_store: state.redis_store.clone(),\n184\t }\n185\t }\n186\t}\n187\t\n188\t// Implement FromRef so that routes::aliases::AliasState can be extracted from UnifiedState\n189\timpl FromRef for routes::aliases::AliasState {\n190\t fn from_ref(state: &UnifiedState) -> Self {\n191\t Self {\n192\t config: state.admin.config.clone(),\n193\t task_store: state.admin.task_store.clone(),\n194\t metrics: state.metrics.clone(),\n195\t }\n196\t }\n197\t}\n198\t\n199\t// Implement FromRef so that routes::explain::ExplainState can be extracted from UnifiedState\n200\timpl FromRef for routes::explain::ExplainState {\n201\t fn from_ref(state: &UnifiedState) -> Self {\n202\t Self {\n203\t config: state.admin.config.clone(),\n204\t topology: state.admin.topology.clone(),\n205\t }\n206\t }\n207\t}\n208\t\n209\t// Implement FromRef so that routes::multi_search::MultiSearchState can be extracted from UnifiedState\n210\timpl FromRef for routes::multi_search::MultiSearchState {\n211\t fn from_ref(state: &UnifiedState) -> Self {\n212\t Self {\n213\t config: state.admin.config.clone(),\n214\t topology: state.admin.topology.clone(),\n215\t node_master_key: state.admin.config.master_key.clone(),\n216\t metrics: state.metrics.clone(),\n217\t }\n218\t }\n219\t}\n220\t\n221\t// Implement FromRef so that routes::canary::CanaryState can be extracted from UnifiedState\n222\timpl FromRef for routes::canary::CanaryState {\n223\t fn from_ref(state: &UnifiedState) -> Self {\n224\t // Canary routes require Redis task store\n225\t let redis_store = state.redis_store.clone()\n226\t .expect(\"Canary routes require Redis task store (task_store.backend: redis)\");\n227\t let store: Arc = Arc::from(redis_store);\n228\t Self {\n229\t store,\n230\t capture: state.query_capture.clone(),\n231\t }\n232\t }\n233\t}\n234\t\n235\t#[tokio::main]\n236\tasync fn main() -> anyhow::Result<()> {\n237\t // Load configuration (file → env → CLI overlay)\n238\t let config = MiroirConfig::load()\n239\t .map_err(|e| anyhow::anyhow!(\"Failed to load config: {}\", e))?;\n240\t\n241\t // Initialize structured JSON logging (plan §10 format)\n242\t // Fields on every line: timestamp, level, target, message, pod_id\n243\t // Per-request fields (request_id) are added by telemetry middleware span.\n244\t let filter = EnvFilter::try_from_default_env()\n245\t .unwrap_or_else(|_| EnvFilter::new(\"info\"));\n246\t\n247\t let pod_id = std::env::var(\"POD_NAME\").unwrap_or_else(|_| \"unknown\".to_string());\n248\t\n249\t // Build subscriber - conditionally add OTel layer\n250\t // Note: We rebuild the layers in each branch because the types differ\n251\t // OTel layer must be applied to the bare registry first\n252\t if let Some(otel_layer) = otel::init_otel_layer(&config) {\n253\t let json_layer = tracing_subscriber::fmt::layer()\n254\t .json()\n255\t .flatten_event(true)\n256\t .with_target(true)\n257\t .with_current_span(true)\n258\t .with_span_list(false);\n259\t // Apply OTel layer to registry first, then add filter and json layer\n260\t registry()\n261\t .with(otel_layer)\n262\t .with(filter)\n263\t .with(json_layer)\n264\t .init();\n265\t } else {\n266\t let json_layer = tracing_subscriber::fmt::layer()\n267\t .json()\n268\t .flatten_event(true)\n269\t .with_target(true)\n270\t .with_current_span(true)\n271\t .with_span_list(false);\n272\t registry()\n273\t .with(filter)\n274\t .with(json_layer)\n275\t .init();\n276\t }\n277\t\n278\t // Set pod_id as a global default field so it appears on every log line.\n279\t // This is done via a separate info span that is entered once and never\n280\t // left — its fields propagate to all child spans and events.\n281\t let _pod_span = tracing::info_span!(\"runtime\", pod_id = %pod_id).entered();\n282\t\n283\t info!(\n284\t shards = config.shards,\n285\t replication_factor = config.replication_factor,\n286\t replica_groups = config.replica_groups,\n287\t \"miroir-proxy starting\"\n288\t );\n289\t\n290\t // Validate critical secrets at startup (plan §9: \"orchestrator refuses to\n291\t // start the search UI without it\").\n292\t if config.search_ui.enabled {\n293\t let jwt_env = &config.search_ui.auth.jwt_secret_env;\n294\t match std::env::var(jwt_env) {\n295\t Ok(v) if !v.is_empty() => {}\n296\t _ => {\n297\t anyhow::bail!(\n298\t \"search_ui is enabled but {} is not set — refusing to start. \\\n299\t Either set the env var or disable search_ui (search_ui.enabled: false)\",\n300\t jwt_env\n301\t );\n302\t }\n303\t }\n304\t }\n305\t\n306\t // Build unified state\n307\t let state = UnifiedState::new(config.clone());\n308\t\n309\t // Start health checker background task\n310\t let health_checker_state = state.admin.clone();\n311\t tokio::spawn(async move {\n312\t run_health_checker(health_checker_state).await;\n313\t });\n314\t\n315\t // Start rebalancer worker background task (plan §4)\n316\t if let Some(ref worker) = state.admin.rebalancer_worker {\n317\t let worker = worker.clone();\n318\t let pod_id = state.pod_id.clone();\n319\t tokio::spawn(async move {\n320\t info!(\n321\t pod_id = %pod_id,\n322\t \"rebalancer worker task starting\"\n323\t );\n324\t // Load any persisted rebalance jobs from previous runs\n325\t if let Err(e) = worker.load_persisted_jobs().await {\n326\t error!(error = %e, \"failed to load persisted rebalance jobs\");\n327\t }\n328\t worker.run().await;\n329\t error!(\"rebalancer worker task exited unexpectedly\");\n330\t });\n331\t } else {\n332\t info!(\"rebalancer worker not available (no task store configured)\");\n333\t }\n334\t\n335\t // Start scoped key rotation background task (requires Redis)\n336\t if let Some(ref redis) = state.redis_store {\n337\t let rotation_state = ScopedKeyRotationState {\n338\t config: state.admin.config.clone(),\n339\t redis: redis.clone(),\n340\t pod_id: state.pod_id.clone(),\n341\t };\n342\t tokio::spawn(async move {\n343\t scoped_key_rotation::run_scoped_key_rotator(rotation_state).await;\n344\t });\n345\t\n346\t // Start admin session revocation Pub/Sub subscriber (plan §9).\n347\t // When any pod revokes a session (logout), the session ID is published\n348\t // to `miroir:admin_session:revoked`. Every pod subscribes and adds the\n349\t // ID to its in-memory DashMap, ensuring revoked cookies are rejected\n350\t // across all pods within milliseconds.\n351\t let revoked_sessions = state.auth.revoked_sessions.clone();\n352\t let revoked_total = state.auth.admin_session_revoked_total.clone();\n353\t let redis_url = config.task_store.url.clone();\n354\t let key_prefix = redis.key_prefix().to_string();\n355\t tokio::spawn(async move {\n356\t info!(\"starting admin session revocation subscriber\");\n357\t if let Err(e) = miroir_core::task_store::RedisTaskStore::subscribe_session_revocations(\n358\t &redis_url,\n359\t &key_prefix,\n360\t move |session_id: String| {\n361\t revoked_sessions.insert(session_id, ());\n362\t revoked_total.inc();\n363\t },\n364\t )\n365\t .await\n366\t {\n367\t error!(error = %e, \"admin session revocation subscriber exited with error\");\n368\t }\n369\t });\n370\t }\n371\t\n372\t // Load aliases from task store on startup (plan §13.7)\n373\t // Aliases must be loaded before any request routing to ensure consistent resolution\n374\t if let Some(ref task_store) = state.admin.task_store {\n375\t let alias_registry = state.admin.alias_registry.clone();\n376\t let store = task_store.clone();\n377\t tokio::spawn(async move {\n378\t info!(\"loading aliases from task store\");\n379\t match alias_registry.sync_from_store(&*store).await {\n380\t Ok(()) => {\n381\t let count = alias_registry.list().await.len();\n382\t info!(count, \"aliases loaded successfully\");\n383\t }\n384\t Err(e) => {\n385\t error!(error = %e, \"failed to load aliases from task store\");\n386\t }\n387\t }\n388\t });\n389\t } else {\n390\t info!(\"alias loading skipped (no task store configured)\");\n391\t }\n392\t\n393\t // Start drift reconciler background task (plan §13.5)\n394\t // Uses the drift_reconciler from AppState which is already configured\n395\t if let Some(ref drift_reconciler) = state.admin.drift_reconciler {\n396\t let drift_reconciler = drift_reconciler.clone();\n397\t tokio::spawn(async move {\n398\t info!(\"drift reconciler started\");\n399\t drift_reconciler.run().await;\n400\t error!(\"drift reconciler exited unexpectedly\");\n401\t });\n402\t } else {\n403\t info!(\"drift reconciler not available (no task store configured)\");\n404\t }\n405\t\n406\t // Start peer discovery refresh loop (plan §14.5)\n407\t // Periodically performs SRV lookups to discover peer pods\n408\t if let Some(ref peer_discovery) = state.peer_discovery {\n409\t let peer_discovery = peer_discovery.clone();\n410\t let metrics = state.metrics.clone();\n411\t let refresh_interval_s = config.peer_discovery.refresh_interval_s;\n412\t tokio::spawn(async move {\n413\t let mut interval = tokio::time::interval(Duration::from_secs(refresh_interval_s));\n414\t info!(\n415\t interval_s = refresh_interval_s,\n416\t \"peer discovery refresh loop started\"\n417\t );\n418\t loop {\n419\t interval.tick().await;\n420\t match peer_discovery.refresh().await {\n421\t Ok(peer_set) => {\n422\t let count = peer_set.len() as u64;\n423\t info!(\n424\t peer_count = count,\n425\t \"peer discovery refresh completed\"\n426\t );\n427\t metrics.set_peer_pod_count(count);\n428\t }\n429\t Err(e) => {\n430\t error!(error = %e, \"peer discovery refresh failed\");\n431\t }\n432\t }\n433\t }\n434\t });\n435\t } else {\n436\t info!(\"peer discovery disabled (not running in Kubernetes)\");\n437\t }\n438\t\n439\t // Start task registry TTL pruner background task (plan §4, Phase 3)\n440\t // Runs on single-pod with advisory lock; Phase 6 §14.5 Mode A replaces with rendezvous\n441\t if let Some(ref store) = state.admin.task_store {\n442\t let store = store.clone();\n443\t let pruner_config = config.task_registry.clone();\n444\t tokio::spawn(async move {\n445\t // The pruner runs in its own thread via spawn_pruner\n446\t let _pruner_handle = task_pruner::spawn_pruner(store, pruner_config);\n447\t // The handle is dropped here only on process exit\n448\t info!(\"task registry TTL pruner started\");\n449\t // Keep this task alive forever\n450\t std::future::pending::<()>().await;\n451\t });\n452\t } else {\n453\t info!(\"task registry TTL pruner not available (no task store)\");\n454\t }\n455\t\n456\t // Start canary runner background task (plan §13.18)\n457\t // Only enabled when canary_runner.enabled = true and Redis is available\n458\t if config.canary_runner.enabled {\n459\t if let Some(ref redis) = state.redis_store {\n460\t let store: Arc = Arc::from(redis.clone());\n461\t let canary_config = config.canary_runner.clone();\n462\t\n463\t // Clone config values for the search executor\n464\t let search_config = config.clone();\n465\t let search_executor: miroir_core::canary::SearchExecutor = Arc::new(\n466\t move |index_uid: &str, query: &SearchQuery| -> std::pin::Pin> + Send>> {\n467\t let index_uid = index_uid.to_string();\n468\t let query = query.clone();\n469\t let config = search_config.clone();\n470\t\n471\t Box::pin(async move {\n472\t // For canary queries, we execute against the first available healthy node\n473\t let node_addresses: Vec<_> = config.nodes.iter()\n474\t .map(|n| n.address.clone())\n475\t .collect();\n476\t\n477\t for address in node_addresses {\n478\t let client = match reqwest::Client::builder()\n479\t .timeout(std::time::Duration::from_millis(config.scatter.node_timeout_ms))\n480\t .build()\n481\t {\n482\t Ok(c) => c,\n483\t Err(_) => continue,\n484\t };\n485\t\n486\t let url = format!(\"{}/indexes/{}/search\", address.trim_end_matches('/'), index_uid);\n487\t\n488\t // Build the search request body\n489\t let mut body = match serde_json::to_value(&query) {\n490\t Ok(v) => v,\n491\t Err(e) => return Err(miroir_core::error::MiroirError::InvalidRequest(format!(\"Failed to serialize query: {}\", e))),\n492\t };\n493\t\n494\t // Add limit to avoid large responses for canary queries\n495\t if !body.get(\"limit\").and_then(|v| v.as_u64()).is_some() {\n496\t body[\"limit\"] = serde_json::json!(20);\n497\t }\n498\t\n499\t let response = match client.post(&url)\n500\t .header(\"Authorization\", format!(\"Bearer {}\", config.node_master_key))\n501\t .json(&body)\n502\t .send()\n503\t .await\n504\t {\n505\t Ok(r) => r,\n506\t Err(_) => continue,\n507\t };\n508\t\n509\t if response.status().is_success() {\n510\t if let Ok(text) = response.text().await {\n511\t if let Ok(search_response) = serde_json::from_str::(&text) {\n512\t return Ok(search_response);\n513\t }\n514\t }\n515\t }\n516\t }\n517\t\n518\t // All nodes failed\n519\t Err(miroir_core::error::MiroirError::Topology(\n520\t \"All nodes failed for canary query\".to_string()\n521\t ))\n522\t })\n523\t }\n524\t );\n525\t\n526\t // Create metrics emitter callback\n527\t let metrics_for_canary = state.metrics.clone();\n528\t let metrics_emitter: miroir_core::canary::MetricsEmitter = Arc::new(\n529\t move |result| {\n530\t use miroir_core::canary::CanaryStatus;\n531\t let result_str = match result.status {\n532\t CanaryStatus::Passed => \"passed\",\n533\t CanaryStatus::Failed => \"failed\",\n534\t CanaryStatus::Error => \"error\",\n535\t };\n536\t metrics_for_canary.inc_canary_runs(&result.canary_id, result_str);\n537\t metrics_for_canary.observe_canary_latency_ms(&result.canary_id, result.latency_ms as f64);\n538\t\n539\t for failure in &result.failed_assertions {\n540\t metrics_for_canary.inc_canary_assertion_failures(&result.canary_id, &failure.assertion_type);\n541\t }\n542\t }\n543\t );\n544\t\n545\t // Create settings version checker callback\n546\t let store_for_version = store.clone();\n547\t let version_config = config.clone();\n548\t let settings_version_checker: miroir_core::canary::SettingsVersionChecker = Arc::new(\n549\t move |index_uid: &str| -> Option {\n550\t // Try to get the settings version from the task store\n551\t let node_ids: Vec = version_config.nodes.iter()\n552\t .map(|n| n.id.clone())\n553\t .collect();\n554\t\n555\t let mut min_version: Option = None;\n556\t for node_id in node_ids {\n557\t if let Ok(Some(row)) = store_for_version.get_node_settings_version(index_uid, &node_id) {\n558\t match min_version {\n559\t None => min_version = Some(row.version),\n560\t Some(current) if row.version < current => min_version = Some(row.version),\n561\t _ => {}\n562\t }\n563\t }\n564\t }\n565\t min_version\n566\t }\n567\t );\n568\t\n569\t // Create and start the canary runner\n570\t let runner = CanaryRunner::new(\n571\t store,\n572\t canary_config.max_concurrent_canaries as usize,\n573\t canary_config.run_history_per_canary as usize,\n574\t search_executor,\n575\t metrics_emitter,\n576\t settings_version_checker,\n577\t );\n578\t\n579\t tokio::spawn(async move {\n580\t info!(\"canary runner started\");\n581\t if let Err(e) = runner.start().await {\n582\t error!(\"canary runner exited: {}\", e);\n583\t }\n584\t });\n585\t } else {\n586\t info!(\"canary runner enabled but Redis not available - skipping\");\n587\t }\n588\t }\n589\t\n590\t // Build the main app router with UnifiedState\n591\t let app = Router::new()\n592\t .route(\"/health\", get(health::get_health))\n593\t .route(\"/version\", get(version::get_version::))\n594\t .route(\"/stats\", get(indexes::global_stats_handler))\n595\t .route(\"/multi-search\", post(multi_search::multi_search::)) // §13.11\n596\t .nest(\"/_miroir\", admin::router::())\n597\t .nest(\"/indexes\", indexes::router::())\n598\t .nest(\"/keys\", keys::router::())\n599\t .nest(\"/search\", search::router::())\n600\t .nest(\"/settings\", settings::router::())\n601\t .nest(\"/tasks\", tasks::router::())\n602\t // IMPORTANT: Layer order matters! Last layer() call = outermost = runs first.\n603\t // The middleware stack (from outermost to innermost):\n604\t // 1. csrf_middleware - runs first\n605\t // 2. auth_middleware\n606\t // 3. Extension layers\n607\t // 4. session_pinning_middleware - extracts X-Miroir-Session header\n608\t // 5. request_id_middleware - sets X-Request-Id header\n609\t // 6. telemetry_middleware - reads X-Request-Id, creates tracing span with request_id field\n610\t // The span's request_id field propagates to all child log events via with_current_span(true)\n611\t //\n612\t // To achieve this order, we add layers in REVERSE (last call = outermost):\n613\t .layer(axum::middleware::from_fn_with_state(\n614\t TelemetryState {\n615\t metrics: state.metrics.clone(),\n616\t pod_id: state.pod_id.clone(),\n617\t },\n618\t middleware::telemetry_middleware,\n619\t ))\n620\t .layer(axum::middleware::from_fn(\n621\t middleware::request_id_middleware,\n622\t ))\n623\t .layer(axum::middleware::from_fn(\n624\t middleware::session_pinning_middleware,\n625\t ))\n626\t .layer(axum::extract::DefaultBodyLimit::max(\n627\t config.server.max_body_bytes as usize,\n628\t ))\n629\t .layer(axum::Extension(state.admin.config.clone()))\n630\t .layer(axum::Extension(std::sync::Arc::new(state.admin.clone())))\n631\t .layer(axum::middleware::from_fn_with_state(\n632\t state.auth.clone(),\n633\t auth::auth_middleware,\n634\t ))\n635\t .layer(axum::middleware::from_fn_with_state(\n636\t auth::CsrfState {\n637\t auth: state.auth.clone(),\n638\t redis_store: state.redis_store.clone(),\n639\t },\n640\t auth::csrf_middleware,\n641\t ))\n642\t .with_state(state.clone());\n643\t\n644\t let main_addr: SocketAddr = format!(\"{}:{}\", config.server.bind, config.server.port)\n645\t .parse()\n646\t .map_err(|e| anyhow::anyhow!(\"Invalid bind address: {}\", e))?;\n647\t let metrics_addr: SocketAddr = SocketAddr::from(([0, 0, 0, 0], 9090));\n648\t\n649\t info!(\n650\t main_addr = %main_addr,\n651\t metrics_addr = %metrics_addr,\n652\t \"listening\"\n653\t );\n654\t\n655\t // Create listeners\n656\t let main_listener = tokio::net::TcpListener::bind(main_addr).await?;\n657\t let metrics_listener = tokio::net::TcpListener::bind(metrics_addr).await?;\n658\t\n659\t // Spawn main server with graceful shutdown\n660\t let main_server = axum::serve(main_listener, app)\n661\t .with_graceful_shutdown(shutdown_signal());\n662\t\n663\t // Spawn metrics server with graceful shutdown\n664\t let metrics_app = metrics_router().with_state(state.metrics.clone());\n665\t let metrics_server = axum::serve(metrics_listener, metrics_app)\n666\t .with_graceful_shutdown(shutdown_signal());\n667\t\n668\t // Run both servers concurrently\n669\t let (main_result, metrics_result) = tokio::join!(\n670\t main_server,\n671\t metrics_server\n672\t );\n673\t\n674\t // Check for errors\n675\t if let Err(e) = main_result {\n676\t error!(\"main server error: {}\", e);\n677\t }\n678\t if let Err(e) = metrics_result {\n679\t error!(\"metrics server error: {}\", e);\n680\t }\n681\t\n682\t Ok(())\n683\t}\n684\t\n685\t/// Background health checker - promotes nodes to Active when reachable.\n686\t///\n687\t/// On each tick it also updates the Prometheus metrics for node health,\n688\t/// shard coverage, shard distribution, and degraded shard count.\n689\tasync fn run_health_checker(state: admin_endpoints::AppState) {\n690\t let mut interval = tokio::time::interval(Duration::from_millis(\n691\t state.config.health.interval_ms,\n692\t ));\n693\t\n694\t loop {\n695\t interval.tick().await;\n696\t\n697\t let mut topo = state.topology.write().await;\n698\t let mut all_healthy = true;\n699\t\n700\t // Collect node IDs to iterate\n701\t let node_ids: Vec<_> = topo.nodes().map(|n| n.id.clone()).collect();\n702\t\n703\t for node_id in &node_ids {\n704\t // Get current node status\n705\t let current_status = topo.node(node_id).map(|n| n.status);\n706\t\n707\t // Skip nodes that are already Active/Healthy\n708\t if let Some(NodeStatus::Active) | Some(NodeStatus::Healthy) = current_status {\n709\t continue;\n710\t }\n711\t\n712\t // Get node address\n713\t let node_address = match topo.node(node_id) {\n714\t Some(n) => n.address.clone(),\n715\t None => {\n716\t all_healthy = false;\n717\t continue;\n718\t }\n719\t };\n720\t\n721\t // Try to reach the node\n722\t let client = match reqwest::Client::builder()\n723\t .timeout(Duration::from_millis(state.config.health.timeout_ms))\n724\t .build()\n725\t {\n726\t Ok(c) => c,\n727\t Err(_) => {\n728\t all_healthy = false;\n729\t continue;\n730\t }\n731\t };\n732\t\n733\t let url = format!(\"{}/health\", node_address.trim_end_matches('/'));\n734\t let result = client.get(&url).send().await;\n735\t\n736\t if result.is_ok() && result.unwrap().status().is_success() {\n737\t // Node is reachable - promote to Active\n738\t if let Some(node) = topo.node_mut(node_id) {\n739\t let _ = node.transition_to(NodeStatus::Active);\n740\t info!(node_id = %node_id, \"node promoted to Active\");\n741\t }\n742\t } else {\n743\t all_healthy = false;\n744\t }\n745\t }\n746\t\n747\t // Update node health gauges (§10 node metrics)\n748\t for node_id in &node_ids {\n749\t let healthy = topo.node(node_id).map(|n| n.is_healthy()).unwrap_or(false);\n750\t state.metrics.set_node_healthy(node_id.as_str(), healthy);\n751\t }\n752\t\n753\t // Compute and update shard metrics (§10 shard metrics)\n754\t update_shard_metrics(&topo, &state.metrics);\n755\t\n756\t // Update task registry size gauge\n757\t let task_count = state.task_registry.count();\n758\t state.metrics.set_task_registry_size(task_count as f64);\n759\t\n760\t // Sync rebalancer metrics to Prometheus\n761\t state.sync_rebalancer_metrics_to_prometheus().await;\n762\t\n763\t // Mark ready once all configured nodes are reachable\n764\t if all_healthy && !state.config.nodes.is_empty() {\n765\t state.mark_ready().await;\n766\t }\n767\t\n768\t // Update §14.9 resource-pressure metrics\n769\t update_resource_pressure_metrics(&state.metrics);\n770\t\n771\t // Update §13.6 session pinning metrics\n772\t state.session_manager.update_metrics(|count| {\n773\t state.metrics.set_session_active_count(count as u64);\n774\t });\n775\t\n776\t // Prune expired sessions (plan §13.6)\n777\t let pruned = state.session_manager.prune_expired().await;\n778\t if pruned > 0 {\n779\t info!(\n780\t pruned_count = pruned,\n781\t \"pruned expired sessions\"\n782\t );\n783\t }\n784\t }\n785\t}\n786\t\n787\t/// Compute shard coverage, degraded count, and per-node shard distribution\n788\t/// from the current topology and update the corresponding Prometheus gauges.\n789\tfn update_shard_metrics(topo: &Topology, metrics: &middleware::Metrics) {\n790\t let node_map = topo.node_map();\n791\t let mut healthy_shards = 0u64;\n792\t let mut degraded_shards = 0u64;\n793\t\n794\t // Per-node shard count\n795\t let mut node_shard_counts: std::collections::HashMap =\n796\t std::collections::HashMap::new();\n797\t\n798\t for shard_id in 0..topo.shards {\n799\t let mut has_healthy_replica = false;\n800\t for group in topo.groups() {\n801\t let assigned = miroir_core::router::assign_shard_in_group(\n802\t shard_id, group.nodes(), topo.rf(),\n803\t );\n804\t for node_id in &assigned {\n805\t let healthy = node_map\n806\t .get(node_id)\n807\t .map(|n| n.is_healthy())\n808\t .unwrap_or(false);\n809\t if healthy {\n810\t has_healthy_replica = true;\n811\t *node_shard_counts.entry(node_id.clone()).or_insert(0) += 1;\n812\t }\n813\t }\n814\t }\n815\t if has_healthy_replica {\n816\t healthy_shards += 1;\n817\t } else {\n818\t degraded_shards += 1;\n819\t }\n820\t }\n821\t\n822\t let coverage = if topo.shards > 0 {\n823\t healthy_shards as f64 / topo.shards as f64\n824\t } else {\n825\t 1.0\n826\t };\n827\t metrics.set_shard_coverage(coverage);\n828\t metrics.set_degraded_shards(degraded_shards as f64);\n829\t\n830\t for (node_id, count) in &node_shard_counts {\n831\t metrics.set_shard_distribution(node_id.as_str(), *count as f64);\n832\t }\n833\t}\n834\t\n835\t/// Read cgroup v2 memory pressure and update §14.9 resource-pressure gauges.\n836\t///\n837\t/// In Kubernetes each container has its own cgroup; the paths below are the\n838\t/// standard cgroup v2 mount points. If the files don't exist (e.g. local dev\n839\t/// on macOS) the metrics remain at their zero defaults.\n840\tfn update_resource_pressure_metrics(metrics: &middleware::Metrics) {\n841\t // ── Memory pressure ──\n842\t // cgroup v2: /sys/fs/cgroup/memory.current and memory.max\n843\t let mem_current = read_cgroup_metric(\"/sys/fs/cgroup/memory.current\");\n844\t let mem_max = read_cgroup_metric(\"/sys/fs/cgroup/memory.max\");\n845\t\n846\t if let (Some(current), Some(max)) = (mem_current, mem_max) {\n847\t if max > 0 {\n848\t let ratio = current as f64 / max as f64;\n849\t let level = if ratio > 0.90 { 2 } else if ratio > 0.75 { 1 } else { 0 };\n850\t metrics.set_memory_pressure(level);\n851\t }\n852\t }\n853\t\n854\t // ── CPU throttling ──\n855\t // cgroup v2: /sys/fs/cgroup/cpu.stat contains throttle_usec\n856\t if let Ok(contents) = std::fs::read_to_string(\"/sys/fs/cgroup/cpu.stat\") {\n857\t for line in contents.lines() {\n858\t if let Some(rest) = line.strip_prefix(\"throttled_usec \") {\n859\t if let Ok(usec) = rest.trim().parse::() {\n860\t // Report delta — the counter is cumulative, so we report\n861\t // the raw value and let Prometheus handle rate().\n862\t // For simplicity we set the counter to the absolute value\n863\t // (Prometheus counters are monotonic; since this is called\n864\t // periodically, we just inc by the new delta).\n865\t // Actually, the metric is a Counter, so we can only inc it.\n866\t // We'll read the previous throttled value from a thread-local.\n867\t // Simpler approach: just report the current throttle time\n868\t // as a one-shot increment if non-zero.\n869\t metrics.inc_cpu_throttled_seconds(usec / 1_000_000.0);\n870\t }\n871\t }\n872\t }\n873\t }\n874\t\n875\t // ── Peer pod count and leader status ──\n876\t // Peer pod count is now set by peer discovery refresh loop (plan §14.5).\n877\t // Leader election is not yet implemented (plan §14.5 Mode B).\n878\t // Owned shards count will be set by Mode A rendezvous (plan §14.5).\n879\t metrics.set_leader(true);\n880\t metrics.set_owned_shards_count(0);\n881\t}\n882\t\n883\t/// Read a single integer value from a cgroup pseudo-file.\n884\tfn read_cgroup_metric(path: &str) -> Option {\n885\t std::fs::read_to_string(path)\n886\t .ok()\n887\t .and_then(|s| s.trim().parse::().ok())\n888\t}\n889\t\n890\t/// Graceful shutdown signal handler.\n891\tasync fn shutdown_signal() {\n892\t let ctrl_c = async {\n893\t signal::ctrl_c()\n894\t .await\n895\t .expect(\"failed to install Ctrl+C handler\");\n896\t };\n897\t\n898\t #[cfg(unix)]\n899\t let terminate = async {\n900\t signal::unix::signal(signal::unix::SignalKind::terminate())\n901\t .expect(\"failed to install signal handler\")\n902\t .recv()\n903\t .await;\n904\t };\n905\t\n906\t #[cfg(not(unix))]\n907\t let terminate = std::future::pending::<()>;\n908\t\n909\t tokio::select! {\n910\t _ = ctrl_c => {},\n911\t _ = terminate => {},\n912\t }\n913\t\n914\t info!(\"shutdown signal received, draining in-flight requests...\");\n915\t\n916\t // Shutdown OpenTelemetry to flush any pending traces\n917\t otel::shutdown_otel();\n918\t}\n919\t"}]},"parent_tool_use_id":null,"session_id":"117cfbb2-d192-47e4-94cf-6ac9c9c2ff6a","uuid":"3dc882d5-6a3a-4179-8067-4224126188dc","timestamp":"2026-05-23T05:04:46.667Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/crates/miroir-proxy/src/main.rs","content":"use axum::{\n extract::FromRef,\n routing::{get, post},\n Router,\n};\nuse miroir_core::{\n config::MiroirConfig,\n peer_discovery::PeerDiscovery,\n rebalancer_worker::{RebalancerWorker, RebalancerWorkerConfig, TopologyChangeEvent},\n task_pruner,\n topology::{NodeStatus, Topology},\n};\nuse std::net::SocketAddr;\nuse std::time::Duration;\nuse tokio::signal;\nuse tracing::{error, info};\nuse tracing_subscriber::{EnvFilter, layer::SubscriberExt, registry, util::SubscriberInitExt};\n\nmod admin_session;\nmod auth;\nmod client;\nmod middleware;\nmod otel;\nmod routes;\nmod scoped_key_rotation;\n\nuse admin_session::SealKey;\nuse auth::AuthState;\nuse miroir_core::{\n canary::{CanaryAssertion, CanaryRunner, CapturedQuery, QueryCapture, SearchQuery, SearchResponse},\n task_store::TaskStore,\n};\nuse middleware::{Metrics, metrics_router, TelemetryState};\nuse routes::{\n admin, admin_endpoints, explain, health, indexes, keys, multi_search, search, settings, tasks, version,\n};\nuse scoped_key_rotation::ScopedKeyRotationState;\nuse std::sync::Arc;\n\n/// Unified application state containing all shared state.\n#[derive(Clone)]\nstruct UnifiedState {\n auth: AuthState,\n metrics: Metrics,\n admin: admin_endpoints::AppState,\n pod_id: String,\n redis_store: Option,\n query_capture: Arc,\n peer_discovery: Option>,\n}\n\nimpl UnifiedState {\n fn new(config: MiroirConfig) -> Self {\n let metrics = Metrics::new(&config);\n\n let master_key = std::env::var(\"MIROIR_MASTER_KEY\")\n .unwrap_or_else(|_| config.master_key.clone());\n\n let admin_key = std::env::var(\"MIROIR_ADMIN_API_KEY\")\n .unwrap_or_else(|_| config.admin.api_key.clone());\n\n let jwt_primary = if config.search_ui.enabled {\n std::env::var(&config.search_ui.auth.jwt_secret_env).ok()\n } else {\n None\n };\n\n let jwt_previous = std::env::var(&config.search_ui.auth.jwt_secret_previous_env)\n .ok()\n .filter(|v| !v.is_empty());\n\n let seal_key = SealKey::from_env_or_generate();\n\n // Set the key-generated gauge before constructing AuthState\n // so the metric is accurate from the first scrape.\n metrics.admin_session_key_generated().set(if seal_key.is_generated() { 1.0 } else { 0.0 });\n\n let pod_id = std::env::var(\"POD_NAME\").unwrap_or_else(|_| \"unknown\".to_string());\n let namespace = std::env::var(\"POD_NAMESPACE\").unwrap_or_else(|_| \"default\".to_string());\n\n // Create peer discovery instance (plan §14.5)\n // Only enabled when running in Kubernetes (POD_NAME is set to a real pod name)\n let peer_discovery = if pod_id != \"unknown\" {\n Some(Arc::new(PeerDiscovery::new(\n pod_id.clone(),\n namespace,\n config.peer_discovery.service_name.clone(),\n )))\n } else {\n None\n };\n\n // Create Redis task store if backend is redis (must happen before AppState\n // so redis_store and pod_id are available to admin endpoints).\n let redis_store = if config.task_store.backend == \"redis\" && !config.task_store.url.is_empty() {\n let url = config.task_store.url.clone();\n Some(\n tokio::task::block_in_place(|| {\n tokio::runtime::Handle::current().block_on(\n miroir_core::task_store::RedisTaskStore::open(&url)\n )\n })\n .expect(\"Failed to connect to Redis for scoped key rotation\"),\n )\n } else {\n None\n };\n\n let auth = AuthState {\n master_key,\n admin_key: admin_key.clone(),\n jwt_primary,\n jwt_previous,\n seal_key: seal_key.clone(),\n revoked_sessions: std::sync::Arc::new(dashmap::DashMap::new()),\n admin_session_revoked_total: metrics.admin_session_revoked_total(),\n };\n\n let admin = admin_endpoints::AppState::with_redis(\n config.clone(),\n metrics.clone(),\n redis_store.clone(),\n pod_id.clone(),\n seal_key.clone(),\n );\n\n Self {\n auth,\n metrics,\n admin,\n pod_id,\n redis_store,\n query_capture: Arc::new(QueryCapture::new(1000)),\n peer_discovery,\n }\n }\n}\n\n// Implement FromRef so that admin_endpoints::AppState can be extracted from UnifiedState\nimpl FromRef for admin_endpoints::AppState {\n fn from_ref(state: &UnifiedState) -> Self {\n Self {\n config: state.admin.config.clone(),\n topology: state.admin.topology.clone(),\n ready: state.admin.ready.clone(),\n metrics: state.admin.metrics.clone(),\n version_state: state.admin.version_state.clone(),\n task_registry: state.admin.task_registry.clone(),\n redis_store: state.redis_store.clone(),\n task_store: state.admin.task_store.clone(),\n pod_id: state.pod_id.clone(),\n seal_key: state.auth.seal_key.clone(),\n local_rate_limiter: admin_endpoints::LocalAdminRateLimiter::new(),\n local_search_ui_rate_limiter: admin_endpoints::LocalSearchUiRateLimiter::new(),\n rebalancer: state.admin.rebalancer.clone(),\n migration_coordinator: state.admin.migration_coordinator.clone(),\n rebalancer_worker: state.admin.rebalancer_worker.clone(),\n rebalancer_metrics: state.admin.rebalancer_metrics.clone(),\n previous_docs_migrated: state.admin.previous_docs_migrated.clone(),\n settings_broadcast: state.admin.settings_broadcast.clone(),\n drift_reconciler: state.admin.drift_reconciler.clone(),\n session_manager: state.admin.session_manager.clone(),\n alias_registry: state.admin.alias_registry.clone(),\n }\n }\n}\n\n// Implement FromRef so that TelemetryState can be extracted from UnifiedState\nimpl FromRef for TelemetryState {\n fn from_ref(state: &UnifiedState) -> Self {\n TelemetryState {\n metrics: state.metrics.clone(),\n pod_id: state.pod_id.clone(),\n }\n }\n}\n\n// Implement FromRef so that CsrfState can be extracted from UnifiedState\nimpl FromRef for auth::CsrfState {\n fn from_ref(state: &UnifiedState) -> Self {\n auth::CsrfState {\n auth: state.auth.clone(),\n redis_store: state.redis_store.clone(),\n }\n }\n}\n\n// Implement FromRef so that routes::aliases::AliasState can be extracted from UnifiedState\nimpl FromRef for routes::aliases::AliasState {\n fn from_ref(state: &UnifiedState) -> Self {\n Self {\n config: state.admin.config.clone(),\n task_store: state.admin.task_store.clone(),\n metrics: state.metrics.clone(),\n }\n }\n}\n\n// Implement FromRef so that routes::explain::ExplainState can be extracted from UnifiedState\nimpl FromRef for routes::explain::ExplainState {\n fn from_ref(state: &UnifiedState) -> Self {\n Self {\n config: state.admin.config.clone(),\n topology: state.admin.topology.clone(),\n }\n }\n}\n\n// Implement FromRef so that routes::multi_search::MultiSearchState can be extracted from UnifiedState\nimpl FromRef for routes::multi_search::MultiSearchState {\n fn from_ref(state: &UnifiedState) -> Self {\n Self {\n config: state.admin.config.clone(),\n topology: state.admin.topology.clone(),\n node_master_key: state.admin.config.master_key.clone(),\n metrics: state.metrics.clone(),\n }\n }\n}\n\n// Implement FromRef so that routes::canary::CanaryState can be extracted from UnifiedState\nimpl FromRef for routes::canary::CanaryState {\n fn from_ref(state: &UnifiedState) -> Self {\n // Canary routes require Redis task store\n let redis_store = state.redis_store.clone()\n .expect(\"Canary routes require Redis task store (task_store.backend: redis)\");\n let store: Arc = Arc::from(redis_store);\n Self {\n store,\n capture: state.query_capture.clone(),\n }\n }\n}\n\n#[tokio::main]\nasync fn main() -> anyhow::Result<()> {\n // Load configuration (file → env → CLI overlay)\n let config = MiroirConfig::load()\n .map_err(|e| anyhow::anyhow!(\"Failed to load config: {}\", e))?;\n\n // Initialize structured JSON logging (plan §10 format)\n // Fields on every line: timestamp, level, target, message, pod_id\n // Per-request fields (request_id) are added by telemetry middleware span.\n let filter = EnvFilter::try_from_default_env()\n .unwrap_or_else(|_| EnvFilter::new(\"info\"));\n\n let pod_id = std::env::var(\"POD_NAME\").unwrap_or_else(|_| \"unknown\".to_string());\n\n // Build subscriber - conditionally add OTel layer\n // Note: We rebuild the layers in each branch because the types differ\n // OTel layer must be applied to the bare registry first\n if let Some(otel_layer) = otel::init_otel_layer(&config) {\n let json_layer = tracing_subscriber::fmt::layer()\n .json()\n .flatten_event(true)\n .with_target(true)\n .with_current_span(true)\n .with_span_list(false);\n // Apply OTel layer to registry first, then add filter and json layer\n registry()\n .with(otel_layer)\n .with(filter)\n .with(json_layer)\n .init();\n } else {\n let json_layer = tracing_subscriber::fmt::layer()\n .json()\n .flatten_event(true)\n .with_target(true)\n .with_current_span(true)\n .with_span_list(false);\n registry()\n .with(filter)\n .with(json_layer)\n .init();\n }\n\n // Set pod_id as a global default field so it appears on every log line.\n // This is done via a separate info span that is entered once and never\n // left — its fields propagate to all child spans and events.\n let _pod_span = tracing::info_span!(\"runtime\", pod_id = %pod_id).entered();\n\n info!(\n shards = config.shards,\n replication_factor = config.replication_factor,\n replica_groups = config.replica_groups,\n \"miroir-proxy starting\"\n );\n\n // Validate critical secrets at startup (plan §9: \"orchestrator refuses to\n // start the search UI without it\").\n if config.search_ui.enabled {\n let jwt_env = &config.search_ui.auth.jwt_secret_env;\n match std::env::var(jwt_env) {\n Ok(v) if !v.is_empty() => {}\n _ => {\n anyhow::bail!(\n \"search_ui is enabled but {} is not set — refusing to start. \\\n Either set the env var or disable search_ui (search_ui.enabled: false)\",\n jwt_env\n );\n }\n }\n }\n\n // Build unified state\n let state = UnifiedState::new(config.clone());\n\n // Start health checker background task\n let health_checker_state = state.admin.clone();\n tokio::spawn(async move {\n run_health_checker(health_checker_state).await;\n });\n\n // Start rebalancer worker background task (plan §4)\n if let Some(ref worker) = state.admin.rebalancer_worker {\n let worker = worker.clone();\n let pod_id = state.pod_id.clone();\n tokio::spawn(async move {\n info!(\n pod_id = %pod_id,\n \"rebalancer worker task starting\"\n );\n // Load any persisted rebalance jobs from previous runs\n if let Err(e) = worker.load_persisted_jobs().await {\n error!(error = %e, \"failed to load persisted rebalance jobs\");\n }\n worker.run().await;\n error!(\"rebalancer worker task exited unexpectedly\");\n });\n } else {\n info!(\"rebalancer worker not available (no task store configured)\");\n }\n\n // Start scoped key rotation background task (requires Redis)\n if let Some(ref redis) = state.redis_store {\n let rotation_state = ScopedKeyRotationState {\n config: state.admin.config.clone(),\n redis: redis.clone(),\n pod_id: state.pod_id.clone(),\n };\n tokio::spawn(async move {\n scoped_key_rotation::run_scoped_key_rotator(rotation_state).await;\n });\n\n // Start admin session revocation Pub/Sub subscriber (plan §9).\n // When any pod revokes a session (logout), the session ID is published\n // to `miroir:admin_session:revoked`. Every pod subscribes and adds the\n // ID to its in-memory DashMap, ensuring revoked cookies are rejected\n // across all pods within milliseconds.\n let revoked_sessions = state.auth.revoked_sessions.clone();\n let revoked_total = state.auth.admin_session_revoked_total.clone();\n let redis_url = config.task_store.url.clone();\n let key_prefix = redis.key_prefix().to_string();\n tokio::spawn(async move {\n info!(\"starting admin session revocation subscriber\");\n if let Err(e) = miroir_core::task_store::RedisTaskStore::subscribe_session_revocations(\n &redis_url,\n &key_prefix,\n move |session_id: String| {\n revoked_sessions.insert(session_id, ());\n revoked_total.inc();\n },\n )\n .await\n {\n error!(error = %e, \"admin session revocation subscriber exited with error\");\n }\n });\n }\n\n // Load aliases from task store on startup (plan §13.7)\n // Aliases must be loaded before any request routing to ensure consistent resolution\n if let Some(ref task_store) = state.admin.task_store {\n let alias_registry = state.admin.alias_registry.clone();\n let store = task_store.clone();\n tokio::spawn(async move {\n info!(\"loading aliases from task store\");\n match alias_registry.sync_from_store(&*store).await {\n Ok(()) => {\n let count = alias_registry.list().await.len();\n info!(count, \"aliases loaded successfully\");\n }\n Err(e) => {\n error!(error = %e, \"failed to load aliases from task store\");\n }\n }\n });\n } else {\n info!(\"alias loading skipped (no task store configured)\");\n }\n\n // Start drift reconciler background task (plan §13.5)\n // Uses the drift_reconciler from AppState which is already configured\n if let Some(ref drift_reconciler) = state.admin.drift_reconciler {\n let drift_reconciler = drift_reconciler.clone();\n tokio::spawn(async move {\n info!(\"drift reconciler started\");\n drift_reconciler.run().await;\n error!(\"drift reconciler exited unexpectedly\");\n });\n } else {\n info!(\"drift reconciler not available (no task store configured)\");\n }\n\n // Start peer discovery refresh loop (plan §14.5)\n // Periodically performs SRV lookups to discover peer pods\n if let Some(ref peer_discovery) = state.peer_discovery {\n let peer_discovery = peer_discovery.clone();\n let metrics = state.metrics.clone();\n let refresh_interval_s = config.peer_discovery.refresh_interval_s;\n tokio::spawn(async move {\n let mut interval = tokio::time::interval(Duration::from_secs(refresh_interval_s));\n info!(\n interval_s = refresh_interval_s,\n \"peer discovery refresh loop started\"\n );\n loop {\n interval.tick().await;\n match peer_discovery.refresh().await {\n Ok(peer_set) => {\n let count = peer_set.len() as u64;\n info!(\n peer_count = count,\n \"peer discovery refresh completed\"\n );\n metrics.set_peer_pod_count(count);\n }\n Err(e) => {\n error!(error = %e, \"peer discovery refresh failed\");\n }\n }\n }\n });\n } else {\n info!(\"peer discovery disabled (not running in Kubernetes)\");\n }\n\n // Start task registry TTL pruner background task (plan §4, Phase 3)\n // Runs on single-pod with advisory lock; Phase 6 §14.5 Mode A replaces with rendezvous\n if let Some(ref store) = state.admin.task_store {\n let store = store.clone();\n let pruner_config = config.task_registry.clone();\n tokio::spawn(async move {\n // The pruner runs in its own thread via spawn_pruner\n let _pruner_handle = task_pruner::spawn_pruner(store, pruner_config);\n // The handle is dropped here only on process exit\n info!(\"task registry TTL pruner started\");\n // Keep this task alive forever\n std::future::pending::<()>().await;\n });\n } else {\n info!(\"task registry TTL pruner not available (no task store)\");\n }\n\n // Start canary runner background task (plan §13.18)\n // Only enabled when canary_runner.enabled = true and Redis is available\n if config.canary_runner.enabled {\n if let Some(ref redis) = state.redis_store {\n let store: Arc = Arc::from(redis.clone());\n let canary_config = config.canary_runner.clone();\n\n // Clone config values for the search executor\n let search_config = config.clone();\n let search_executor: miroir_core::canary::SearchExecutor = Arc::new(\n move |index_uid: &str, query: &SearchQuery| -> std::pin::Pin> + Send>> {\n let index_uid = index_uid.to_string();\n let query = query.clone();\n let config = search_config.clone();\n\n Box::pin(async move {\n // For canary queries, we execute against the first available healthy node\n let node_addresses: Vec<_> = config.nodes.iter()\n .map(|n| n.address.clone())\n .collect();\n\n for address in node_addresses {\n let client = match reqwest::Client::builder()\n .timeout(std::time::Duration::from_millis(config.scatter.node_timeout_ms))\n .build()\n {\n Ok(c) => c,\n Err(_) => continue,\n };\n\n let url = format!(\"{}/indexes/{}/search\", address.trim_end_matches('/'), index_uid);\n\n // Build the search request body\n let mut body = match serde_json::to_value(&query) {\n Ok(v) => v,\n Err(e) => return Err(miroir_core::error::MiroirError::InvalidRequest(format!(\"Failed to serialize query: {}\", e))),\n };\n\n // Add limit to avoid large responses for canary queries\n if !body.get(\"limit\").and_then(|v| v.as_u64()).is_some() {\n body[\"limit\"] = serde_json::json!(20);\n }\n\n let response = match client.post(&url)\n .header(\"Authorization\", format!(\"Bearer {}\", config.node_master_key))\n .json(&body)\n .send()\n .await\n {\n Ok(r) => r,\n Err(_) => continue,\n };\n\n if response.status().is_success() {\n if let Ok(text) = response.text().await {\n if let Ok(search_response) = serde_json::from_str::(&text) {\n return Ok(search_response);\n }\n }\n }\n }\n\n // All nodes failed\n Err(miroir_core::error::MiroirError::Topology(\n \"All nodes failed for canary query\".to_string()\n ))\n })\n }\n );\n\n // Create metrics emitter callback\n let metrics_for_canary = state.metrics.clone();\n let metrics_emitter: miroir_core::canary::MetricsEmitter = Arc::new(\n move |result| {\n use miroir_core::canary::CanaryStatus;\n let result_str = match result.status {\n CanaryStatus::Passed => \"passed\",\n CanaryStatus::Failed => \"failed\",\n CanaryStatus::Error => \"error\",\n };\n metrics_for_canary.inc_canary_runs(&result.canary_id, result_str);\n metrics_for_canary.observe_canary_latency_ms(&result.canary_id, result.latency_ms as f64);\n\n for failure in &result.failed_assertions {\n metrics_for_canary.inc_canary_assertion_failures(&result.canary_id, &failure.assertion_type);\n }\n }\n );\n\n // Create settings version checker callback\n let store_for_version = store.clone();\n let version_config = config.clone();\n let settings_version_checker: miroir_core::canary::SettingsVersionChecker = Arc::new(\n move |index_uid: &str| -> Option {\n // Try to get the settings version from the task store\n let node_ids: Vec = version_config.nodes.iter()\n .map(|n| n.id.clone())\n .collect();\n\n let mut min_version: Option = None;\n for node_id in node_ids {\n if let Ok(Some(row)) = store_for_version.get_node_settings_version(index_uid, &node_id) {\n match min_version {\n None => min_version = Some(row.version),\n Some(current) if row.version < current => min_version = Some(row.version),\n _ => {}\n }\n }\n }\n min_version\n }\n );\n\n // Create and start the canary runner\n let runner = CanaryRunner::new(\n store,\n canary_config.max_concurrent_canaries as usize,\n canary_config.run_history_per_canary as usize,\n search_executor,\n metrics_emitter,\n settings_version_checker,\n );\n\n tokio::spawn(async move {\n info!(\"canary runner started\");\n if let Err(e) = runner.start().await {\n error!(\"canary runner exited: {}\", e);\n }\n });\n } else {\n info!(\"canary runner enabled but Redis not available - skipping\");\n }\n }\n\n // Build the main app router with UnifiedState\n let app = Router::new()\n .route(\"/health\", get(health::get_health))\n .route(\"/version\", get(version::get_version::))\n .route(\"/stats\", get(indexes::global_stats_handler))\n .route(\"/multi-search\", post(multi_search::multi_search::)) // §13.11\n .nest(\"/_miroir\", admin::router::())\n .nest(\"/indexes\", indexes::router::())\n .nest(\"/keys\", keys::router::())\n .nest(\"/search\", search::router::())\n .nest(\"/settings\", settings::router::())\n .nest(\"/tasks\", tasks::router::())\n // IMPORTANT: Layer order matters! Last layer() call = outermost = runs first.\n // The middleware stack (from outermost to innermost):\n // 1. csrf_middleware - runs first\n // 2. auth_middleware\n // 3. Extension layers\n // 4. session_pinning_middleware - extracts X-Miroir-Session header\n // 5. request_id_middleware - sets X-Request-Id header\n // 6. telemetry_middleware - reads X-Request-Id, creates tracing span with request_id field\n // The span's request_id field propagates to all child log events via with_current_span(true)\n //\n // To achieve this order, we add layers in REVERSE (last call = outermost):\n .layer(axum::middleware::from_fn_with_state(\n TelemetryState {\n metrics: state.metrics.clone(),\n pod_id: state.pod_id.clone(),\n },\n middleware::telemetry_middleware,\n ))\n .layer(axum::middleware::from_fn(\n middleware::request_id_middleware,\n ))\n .layer(axum::middleware::from_fn(\n middleware::session_pinning_middleware,\n ))\n .layer(axum::extract::DefaultBodyLimit::max(\n config.server.max_body_bytes as usize,\n ))\n .layer(axum::Extension(state.admin.config.clone()))\n .layer(axum::Extension(std::sync::Arc::new(state.admin.clone())))\n .layer(axum::middleware::from_fn_with_state(\n state.auth.clone(),\n auth::auth_middleware,\n ))\n .layer(axum::middleware::from_fn_with_state(\n auth::CsrfState {\n auth: state.auth.clone(),\n redis_store: state.redis_store.clone(),\n },\n auth::csrf_middleware,\n ))\n .with_state(state.clone());\n\n let main_addr: SocketAddr = format!(\"{}:{}\", config.server.bind, config.server.port)\n .parse()\n .map_err(|e| anyhow::anyhow!(\"Invalid bind address: {}\", e))?;\n let metrics_addr: SocketAddr = SocketAddr::from(([0, 0, 0, 0], 9090));\n\n info!(\n main_addr = %main_addr,\n metrics_addr = %metrics_addr,\n \"listening\"\n );\n\n // Create listeners\n let main_listener = tokio::net::TcpListener::bind(main_addr).await?;\n let metrics_listener = tokio::net::TcpListener::bind(metrics_addr).await?;\n\n // Spawn main server with graceful shutdown\n let main_server = axum::serve(main_listener, app)\n .with_graceful_shutdown(shutdown_signal());\n\n // Spawn metrics server with graceful shutdown\n let metrics_app = metrics_router().with_state(state.metrics.clone());\n let metrics_server = axum::serve(metrics_listener, metrics_app)\n .with_graceful_shutdown(shutdown_signal());\n\n // Run both servers concurrently\n let (main_result, metrics_result) = tokio::join!(\n main_server,\n metrics_server\n );\n\n // Check for errors\n if let Err(e) = main_result {\n error!(\"main server error: {}\", e);\n }\n if let Err(e) = metrics_result {\n error!(\"metrics server error: {}\", e);\n }\n\n Ok(())\n}\n\n/// Background health checker - promotes nodes to Active when reachable.\n///\n/// On each tick it also updates the Prometheus metrics for node health,\n/// shard coverage, shard distribution, and degraded shard count.\nasync fn run_health_checker(state: admin_endpoints::AppState) {\n let mut interval = tokio::time::interval(Duration::from_millis(\n state.config.health.interval_ms,\n ));\n\n loop {\n interval.tick().await;\n\n let mut topo = state.topology.write().await;\n let mut all_healthy = true;\n\n // Collect node IDs to iterate\n let node_ids: Vec<_> = topo.nodes().map(|n| n.id.clone()).collect();\n\n for node_id in &node_ids {\n // Get current node status\n let current_status = topo.node(node_id).map(|n| n.status);\n\n // Skip nodes that are already Active/Healthy\n if let Some(NodeStatus::Active) | Some(NodeStatus::Healthy) = current_status {\n continue;\n }\n\n // Get node address\n let node_address = match topo.node(node_id) {\n Some(n) => n.address.clone(),\n None => {\n all_healthy = false;\n continue;\n }\n };\n\n // Try to reach the node\n let client = match reqwest::Client::builder()\n .timeout(Duration::from_millis(state.config.health.timeout_ms))\n .build()\n {\n Ok(c) => c,\n Err(_) => {\n all_healthy = false;\n continue;\n }\n };\n\n let url = format!(\"{}/health\", node_address.trim_end_matches('/'));\n let result = client.get(&url).send().await;\n\n if result.is_ok() && result.unwrap().status().is_success() {\n // Node is reachable - promote to Active\n if let Some(node) = topo.node_mut(node_id) {\n let _ = node.transition_to(NodeStatus::Active);\n info!(node_id = %node_id, \"node promoted to Active\");\n }\n } else {\n all_healthy = false;\n }\n }\n\n // Update node health gauges (§10 node metrics)\n for node_id in &node_ids {\n let healthy = topo.node(node_id).map(|n| n.is_healthy()).unwrap_or(false);\n state.metrics.set_node_healthy(node_id.as_str(), healthy);\n }\n\n // Compute and update shard metrics (§10 shard metrics)\n update_shard_metrics(&topo, &state.metrics);\n\n // Update task registry size gauge\n let task_count = state.task_registry.count();\n state.metrics.set_task_registry_size(task_count as f64);\n\n // Sync rebalancer metrics to Prometheus\n state.sync_rebalancer_metrics_to_prometheus().await;\n\n // Mark ready once all configured nodes are reachable\n if all_healthy && !state.config.nodes.is_empty() {\n state.mark_ready().await;\n }\n\n // Update §14.9 resource-pressure metrics\n update_resource_pressure_metrics(&state.metrics);\n\n // Update §13.6 session pinning metrics\n state.session_manager.update_metrics(|count| {\n state.metrics.set_session_active_count(count as u64);\n });\n\n // Prune expired sessions (plan §13.6)\n let pruned = state.session_manager.prune_expired().await;\n if pruned > 0 {\n info!(\n pruned_count = pruned,\n \"pruned expired sessions\"\n );\n }\n }\n}\n\n/// Compute shard coverage, degraded count, and per-node shard distribution\n/// from the current topology and update the corresponding Prometheus gauges.\nfn update_shard_metrics(topo: &Topology, metrics: &middleware::Metrics) {\n let node_map = topo.node_map();\n let mut healthy_shards = 0u64;\n let mut degraded_shards = 0u64;\n\n // Per-node shard count\n let mut node_shard_counts: std::collections::HashMap =\n std::collections::HashMap::new();\n\n for shard_id in 0..topo.shards {\n let mut has_healthy_replica = false;\n for group in topo.groups() {\n let assigned = miroir_core::router::assign_shard_in_group(\n shard_id, group.nodes(), topo.rf(),\n );\n for node_id in &assigned {\n let healthy = node_map\n .get(node_id)\n .map(|n| n.is_healthy())\n .unwrap_or(false);\n if healthy {\n has_healthy_replica = true;\n *node_shard_counts.entry(node_id.clone()).or_insert(0) += 1;\n }\n }\n }\n if has_healthy_replica {\n healthy_shards += 1;\n } else {\n degraded_shards += 1;\n }\n }\n\n let coverage = if topo.shards > 0 {\n healthy_shards as f64 / topo.shards as f64\n } else {\n 1.0\n };\n metrics.set_shard_coverage(coverage);\n metrics.set_degraded_shards(degraded_shards as f64);\n\n for (node_id, count) in &node_shard_counts {\n metrics.set_shard_distribution(node_id.as_str(), *count as f64);\n }\n}\n\n/// Read cgroup v2 memory pressure and update §14.9 resource-pressure gauges.\n///\n/// In Kubernetes each container has its own cgroup; the paths below are the\n/// standard cgroup v2 mount points. If the files don't exist (e.g. local dev\n/// on macOS) the metrics remain at their zero defaults.\nfn update_resource_pressure_metrics(metrics: &middleware::Metrics) {\n // ── Memory pressure ──\n // cgroup v2: /sys/fs/cgroup/memory.current and memory.max\n let mem_current = read_cgroup_metric(\"/sys/fs/cgroup/memory.current\");\n let mem_max = read_cgroup_metric(\"/sys/fs/cgroup/memory.max\");\n\n if let (Some(current), Some(max)) = (mem_current, mem_max) {\n if max > 0 {\n let ratio = current as f64 / max as f64;\n let level = if ratio > 0.90 { 2 } else if ratio > 0.75 { 1 } else { 0 };\n metrics.set_memory_pressure(level);\n }\n }\n\n // ── CPU throttling ──\n // cgroup v2: /sys/fs/cgroup/cpu.stat contains throttle_usec\n if let Ok(contents) = std::fs::read_to_string(\"/sys/fs/cgroup/cpu.stat\") {\n for line in contents.lines() {\n if let Some(rest) = line.strip_prefix(\"throttled_usec \") {\n if let Ok(usec) = rest.trim().parse::() {\n // Report delta — the counter is cumulative, so we report\n // the raw value and let Prometheus handle rate().\n // For simplicity we set the counter to the absolute value\n // (Prometheus counters are monotonic; since this is called\n // periodically, we just inc by the new delta).\n // Actually, the metric is a Counter, so we can only inc it.\n // We'll read the previous throttled value from a thread-local.\n // Simpler approach: just report the current throttle time\n // as a one-shot increment if non-zero.\n metrics.inc_cpu_throttled_seconds(usec / 1_000_000.0);\n }\n }\n }\n }\n\n // ── Peer pod count and leader status ──\n // Peer pod count is now set by peer discovery refresh loop (plan §14.5).\n // Leader election is not yet implemented (plan §14.5 Mode B).\n // Owned shards count will be set by Mode A rendezvous (plan §14.5).\n metrics.set_leader(true);\n metrics.set_owned_shards_count(0);\n}\n\n/// Read a single integer value from a cgroup pseudo-file.\nfn read_cgroup_metric(path: &str) -> Option {\n std::fs::read_to_string(path)\n .ok()\n .and_then(|s| s.trim().parse::().ok())\n}\n\n/// Graceful shutdown signal handler.\nasync fn shutdown_signal() {\n let ctrl_c = async {\n signal::ctrl_c()\n .await\n .expect(\"failed to install Ctrl+C handler\");\n };\n\n #[cfg(unix)]\n let terminate = async {\n signal::unix::signal(signal::unix::SignalKind::terminate())\n .expect(\"failed to install signal handler\")\n .recv()\n .await;\n };\n\n #[cfg(not(unix))]\n let terminate = std::future::pending::<()>;\n\n tokio::select! {\n _ = ctrl_c => {},\n _ = terminate => {},\n }\n\n info!(\"shutdown signal received, draining in-flight requests...\");\n\n // Shutdown OpenTelemetry to flush any pending traces\n otel::shutdown_otel();\n}\n","numLines":919,"startLine":1,"totalLines":919}}} -{"type":"system","subtype":"status","status":"requesting","uuid":"9f9d420e-d065-4094-8bb1-f4b19bed9e01","session_id":"117cfbb2-d192-47e4-94cf-6ac9c9c2ff6a"} 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Peer discovery via Kubernetes headless Service SRV records (plan §14.5).\n2\t//!\n3\t//! This module provides zero-config peer discovery for Miroir pods in the same\n4\t//! Deployment. Each pod periodically performs an SRV lookup against the headless\n5\t//! Service to discover all peer pod names, then updates the peer set atomically.\n6\t//!\n7\t//! # Peer Identity\n8\t//!\n9\t//! - `PeerId = POD_NAME` (the pod name injected via Downward API)\n10\t//! - The headless Service SRV record returns a list of `{target, port}` entries\n11\t//! - The `target` field contains the pod DNS name (e.g., `miroir-miroir-0.miroir-headless.default.svc.cluster.local`)\n12\t//! - We extract the pod name from the first component of the target\n13\t//!\n14\t//! # Usage\n15\t//!\n16\t//! ```no_run\n17\t//! use miroir_core::peer_discovery::{PeerDiscovery, PeerId};\n18\t//! use std::sync::Arc;\n19\t//!\n20\t//! #[tokio::main]\n21\t//! async fn main() {\n22\t//! let pod_name = std::env::var(\"POD_NAME\").unwrap();\n23\t//! let namespace = std::env::var(\"POD_NAMESPACE\").unwrap();\n24\t//! let service_name = \"miroir-headless\";\n25\t//!\n26\t//! let discovery = PeerDiscovery::new(\n27\t//! pod_name,\n28\t//! namespace,\n29\t//! service_name.to_string(),\n30\t//! );\n31\t//!\n32\t//! // Refresh peers\n33\t//! let peers = discovery.refresh().await;\n34\t//! println!(\"Discovered {} peers\", peers.peers.len());\n35\t//! }\n36\t//! ```\n37\t\n38\tuse crate::error::{MiroirError, Result};\n39\tuse serde::{Deserialize, Serialize};\n40\tuse std::sync::Arc;\n41\tuse std::time::Instant;\n42\tuse tokio::sync::RwLock;\n43\t\n44\t/// Unique identifier for a peer pod.\n45\t///\n46\t/// This is simply the pod name (e.g., `miroir-miroir-0`).\n47\tpub type PeerId = String;\n48\t\n49\t/// The current set of discovered peers with metadata.\n50\t#[derive(Debug, Clone, Serialize, Deserialize)]\n51\tpub struct PeerSet {\n52\t /// List of peer pod names (including self).\n53\t pub peers: Vec,\n54\t /// Instant when this peer set was last refreshed.\n55\t pub refreshed_at: Instant,\n56\t}\n57\t\n58\timpl PeerSet {\n59\t /// Create a new peer set.\n60\t pub fn new(peers: Vec) -> Self {\n61\t Self {\n62\t peers,\n63\t refreshed_at: Instant::now(),\n64\t }\n65\t }\n66\t\n67\t /// Count of peers in the set.\n68\t pub fn len(&self) -> usize {\n69\t self.peers.len()\n70\t }\n71\t\n72\t /// Whether the peer set is empty.\n73\t pub fn is_empty(&self) -> bool {\n74\t self.peers.is_empty()\n75\t }\n76\t}\n77\t\n78\t/// Peer discovery via Kubernetes headless Service.\n79\tpub struct PeerDiscovery {\n80\t /// Our own pod name (injected via Downward API).\n81\t pod_name: PeerId,\n82\t /// Kubernetes namespace (injected via Downward API).\n83\t namespace: String,\n84\t /// Headless Service name (e.g., \"miroir-headless\").\n85\t service_name: String,\n86\t /// Current peer set.\n87\t peer_set: Arc>,\n88\t}\n89\t\n90\timpl PeerDiscovery {\n91\t /// Create a new peer discovery instance.\n92\t ///\n93\t /// # Arguments\n94\t ///\n95\t /// * `pod_name` - Our pod name (from `POD_NAME` env var)\n96\t /// * `namespace` - Kubernetes namespace (from `POD_NAMESPACE` env var)\n97\t /// * `service_name` - Headless Service name (e.g., \"miroir-headless\")\n98\t pub fn new(pod_name: String, namespace: String, service_name: String) -> Self {\n99\t Self {\n100\t pod_name,\n101\t namespace,\n102\t service_name,\n103\t peer_set: Arc::new(RwLock::new(PeerSet::new(Vec::new()))),\n104\t }\n105\t }\n106\t\n107\t /// Get the current peer set.\n108\t pub async fn peers(&self) -> Vec {\n109\t self.peer_set.read().await.peers.clone()\n110\t }\n111\t\n112\t /// Get the peer set count.\n113\t pub async fn peer_count(&self) -> usize {\n114\t self.peer_set.read().await.len()\n115\t }\n116\t\n117\t /// Refresh the peer set by performing an SRV lookup.\n118\t ///\n119\t /// This resolves `_miroir._tcp...svc.cluster.local`\n120\t /// and extracts pod names from the returned targets.\n121\t ///\n122\t /// Returns the updated peer set.\n123\t pub async fn refresh(&self) -> Result {\n124\t let srv_name = format!(\n125\t \"_miroir._tcp.{}.{}.svc.cluster.local\",\n126\t self.service_name, self.namespace\n127\t );\n128\t\n129\t // Perform SRV lookup\n130\t let resolver = trust_dns_resolver::TokioAsyncResolver::tokio_from_system_conf()\n131\t .map_err(|e| MiroirError::Discovery(format!(\"failed to create DNS resolver: {}\", e)))?;\n132\t\n133\t let lookup = resolver\n134\t .srv_lookup(&srv_name)\n135\t .await\n136\t .map_err(|e| MiroirError::Discovery(format!(\"SRV lookup failed for {}: {}\", srv_name, e)))?;\n137\t\n138\t // Extract pod names from SRV targets\n139\t // Each SRV record has a target like \"miroir-miroir-0.miroir-headless.default.svc.cluster.local\"\n140\t // We extract the first component as the pod name.\n141\t let mut peers: Vec = lookup\n142\t .iter()\n143\t .filter_map(|srv| {\n144\t let target = srv.target().to_string();\n145\t // Remove trailing dot if present\n146\t let target = target.strip_suffix('.').unwrap_or(&target);\n147\t // Split and take first component\n148\t target.split('.').next().map(|s| s.to_string())\n149\t })\n150\t .collect();\n151\t\n152\t // Sort for deterministic ordering\n153\t peers.sort();\n154\t\n155\t // Update peer set\n156\t let new_peer_set = PeerSet::new(peers);\n157\t *self.peer_set.write().await = new_peer_set.clone();\n158\t\n159\t Ok(new_peer_set)\n160\t }\n161\t\n162\t /// Get our own pod name.\n163\t pub fn pod_name(&self) -> &str {\n164\t &self.pod_name\n165\t }\n166\t}\n167\t\n168\t#[cfg(test)]\n169\tmod tests {\n170\t use super::*;\n171\t\n172\t #[test]\n173\t fn test_peer_set_empty() {\n174\t let set = PeerSet::new(vec![]);\n175\t assert!(set.is_empty());\n176\t assert_eq!(set.len(), 0);\n177\t }\n178\t\n179\t #[test]\n180\t fn test_peer_set_with_peers() {\n181\t let set = PeerSet::new(vec![\"pod-1\".into(), \"pod-2\".into(), \"pod-3\".into()]);\n182\t assert!(!set.is_empty());\n183\t assert_eq!(set.len(), 3);\n184\t }\n185\t}\n186\t"}]},"parent_tool_use_id":null,"session_id":"117cfbb2-d192-47e4-94cf-6ac9c9c2ff6a","uuid":"8c75a9a5-71dd-4af9-b86a-10f8a66e0980","timestamp":"2026-05-23T05:04:50.571Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/crates/miroir-core/src/peer_discovery.rs","content":"//! Peer discovery via Kubernetes headless Service SRV records (plan §14.5).\n//!\n//! This module provides zero-config peer discovery for Miroir pods in the same\n//! Deployment. Each pod periodically performs an SRV lookup against the headless\n//! Service to discover all peer pod names, then updates the peer set atomically.\n//!\n//! # Peer Identity\n//!\n//! - `PeerId = POD_NAME` (the pod name injected via Downward API)\n//! - The headless Service SRV record returns a list of `{target, port}` entries\n//! - The `target` field contains the pod DNS name (e.g., `miroir-miroir-0.miroir-headless.default.svc.cluster.local`)\n//! - We extract the pod name from the first component of the target\n//!\n//! # Usage\n//!\n//! ```no_run\n//! use miroir_core::peer_discovery::{PeerDiscovery, PeerId};\n//! use std::sync::Arc;\n//!\n//! #[tokio::main]\n//! async fn main() {\n//! let pod_name = std::env::var(\"POD_NAME\").unwrap();\n//! let namespace = std::env::var(\"POD_NAMESPACE\").unwrap();\n//! let service_name = \"miroir-headless\";\n//!\n//! let discovery = PeerDiscovery::new(\n//! pod_name,\n//! namespace,\n//! service_name.to_string(),\n//! );\n//!\n//! // Refresh peers\n//! let peers = discovery.refresh().await;\n//! println!(\"Discovered {} peers\", peers.peers.len());\n//! }\n//! ```\n\nuse crate::error::{MiroirError, Result};\nuse serde::{Deserialize, Serialize};\nuse std::sync::Arc;\nuse std::time::Instant;\nuse tokio::sync::RwLock;\n\n/// Unique identifier for a peer pod.\n///\n/// This is simply the pod name (e.g., `miroir-miroir-0`).\npub type PeerId = String;\n\n/// The current set of discovered peers with metadata.\n#[derive(Debug, Clone, Serialize, Deserialize)]\npub struct PeerSet {\n /// List of peer pod names (including self).\n pub peers: Vec,\n /// Instant when this peer set was last refreshed.\n pub refreshed_at: Instant,\n}\n\nimpl PeerSet {\n /// Create a new peer set.\n pub fn new(peers: Vec) -> Self {\n Self {\n peers,\n refreshed_at: Instant::now(),\n }\n }\n\n /// Count of peers in the set.\n pub fn len(&self) -> usize {\n self.peers.len()\n }\n\n /// Whether the peer set is empty.\n pub fn is_empty(&self) -> bool {\n self.peers.is_empty()\n }\n}\n\n/// Peer discovery via Kubernetes headless Service.\npub struct PeerDiscovery {\n /// Our own pod name (injected via Downward API).\n pod_name: PeerId,\n /// Kubernetes namespace (injected via Downward API).\n namespace: String,\n /// Headless Service name (e.g., \"miroir-headless\").\n service_name: String,\n /// Current peer set.\n peer_set: Arc>,\n}\n\nimpl PeerDiscovery {\n /// Create a new peer discovery instance.\n ///\n /// # Arguments\n ///\n /// * `pod_name` - Our pod name (from `POD_NAME` env var)\n /// * `namespace` - Kubernetes namespace (from `POD_NAMESPACE` env var)\n /// * `service_name` - Headless Service name (e.g., \"miroir-headless\")\n pub fn new(pod_name: String, namespace: String, service_name: String) -> Self {\n Self {\n pod_name,\n namespace,\n service_name,\n peer_set: Arc::new(RwLock::new(PeerSet::new(Vec::new()))),\n }\n }\n\n /// Get the current peer set.\n pub async fn peers(&self) -> Vec {\n self.peer_set.read().await.peers.clone()\n }\n\n /// Get the peer set count.\n pub async fn peer_count(&self) -> usize {\n self.peer_set.read().await.len()\n }\n\n /// Refresh the peer set by performing an SRV lookup.\n ///\n /// This resolves `_miroir._tcp...svc.cluster.local`\n /// and extracts pod names from the returned targets.\n ///\n /// Returns the updated peer set.\n pub async fn refresh(&self) -> Result {\n let srv_name = format!(\n \"_miroir._tcp.{}.{}.svc.cluster.local\",\n self.service_name, self.namespace\n );\n\n // Perform SRV lookup\n let resolver = trust_dns_resolver::TokioAsyncResolver::tokio_from_system_conf()\n .map_err(|e| MiroirError::Discovery(format!(\"failed to create DNS resolver: {}\", e)))?;\n\n let lookup = resolver\n .srv_lookup(&srv_name)\n .await\n .map_err(|e| MiroirError::Discovery(format!(\"SRV lookup failed for {}: {}\", srv_name, e)))?;\n\n // Extract pod names from SRV targets\n // Each SRV record has a target like \"miroir-miroir-0.miroir-headless.default.svc.cluster.local\"\n // We extract the first component as the pod name.\n let mut peers: Vec = lookup\n .iter()\n .filter_map(|srv| {\n let target = srv.target().to_string();\n // Remove trailing dot if present\n let target = target.strip_suffix('.').unwrap_or(&target);\n // Split and take first component\n target.split('.').next().map(|s| s.to_string())\n })\n .collect();\n\n // Sort for deterministic ordering\n peers.sort();\n\n // Update peer set\n let new_peer_set = PeerSet::new(peers);\n *self.peer_set.write().await = new_peer_set.clone();\n\n Ok(new_peer_set)\n }\n\n /// Get our own pod name.\n pub fn pod_name(&self) -> &str {\n &self.pod_name\n }\n}\n\n#[cfg(test)]\nmod tests {\n use super::*;\n\n #[test]\n fn test_peer_set_empty() {\n let set = PeerSet::new(vec![]);\n assert!(set.is_empty());\n assert_eq!(set.len(), 0);\n }\n\n #[test]\n fn test_peer_set_with_peers() {\n let set = PeerSet::new(vec![\"pod-1\".into(), \"pod-2\".into(), \"pod-3\".into()]);\n assert!(!set.is_empty());\n assert_eq!(set.len(), 3);\n 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Registry::new();\n382-\n383- // ── Request metrics ──\n384- let request_duration = HistogramVec::new(\n385- HistogramOpts::new(\"miroir_request_duration_seconds\", \"Request latency in seconds\")\n386- .buckets(vec![0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0, 10.0]),\n387- &[\"method\", \"path_template\", \"status\"],\n388- )\n389- .expect(\"failed to create request_duration histogram\");\n390-\n391- let requests_total = CounterVec::new(\n392- Opts::new(\"miroir_requests_total\", \"Total number of requests\"),\n393- &[\"method\", \"path_template\", \"status\"],\n394- )\n395- .expect(\"failed to create requests_total counter\");\n396-\n397- let requests_in_flight = Gauge::with_opts(\n398- Opts::new(\"miroir_requests_in_flight\", \"Number of requests currently being processed\"),\n399- )\n400- .expect(\"failed to create requests_in_flight gauge\");\n401-\n402- // ── Node health metrics ──\n403- let node_healthy = GaugeVec::new(\n404- Opts::new(\"miroir_node_healthy\", \"Health status of backend nodes (1=healthy, 0=unhealthy)\"),\n405- &[\"node_id\"],\n406- )\n407- .expect(\"failed to create node_healthy gauge\");\n408-\n409- let node_request_duration = HistogramVec::new(\n410- HistogramOpts::new(\"miroir_node_request_duration_seconds\", \"Latency of individual node requests\")\n411- .buckets(vec![0.001, 0.005, 0.01, 0.025, 0.05, 0.1, 0.5, 1.0]),\n412- &[\"node_id\", \"operation\"],\n413- )\n414- .expect(\"failed to create node_request_duration histogram\");\n415-\n416- let node_errors = CounterVec::new(\n417- Opts::new(\"miroir_node_errors_total\", \"Number of errors from backend nodes\"),\n418- &[\"node_id\", \"error_type\"],\n419- )\n420- .expect(\"failed to create node_errors counter\");\n421-\n422- // ── Shard metrics ──\n423- let shard_coverage = Gauge::with_opts(\n424- Opts::new(\"miroir_shard_coverage\", \"Fraction of shards with at least one healthy replica\"),\n425- )\n426- .expect(\"failed to create shard_coverage gauge\");\n427-\n428- let degraded_shards = Gauge::with_opts(\n429- Opts::new(\"miroir_degraded_shards_total\", \"Number of shards with reduced replica availability\"),\n430- )\n431- .expect(\"failed to create degraded_shards gauge\");\n432-\n433- let shard_distribution = GaugeVec::new(\n434- Opts::new(\"miroir_shard_distribution\", \"Number of shards assigned to each node\"),\n435- &[\"node_id\"],\n436- )\n437- .expect(\"failed to create shard_distribution gauge\");\n438-\n439- // ── Task metrics ──\n440- let task_processing_age = Histogram::with_opts(\n441- HistogramOpts::new(\"miroir_task_processing_age_seconds\", \"Time between task creation and processing start\")\n442- .buckets(vec![0.01, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0, 10.0, 30.0, 60.0]),\n443- )\n444- .expect(\"failed to create task_processing_age histogram\");\n445-\n446- let tasks_total = CounterVec::new(\n447- Opts::new(\"miroir_tasks_total\", \"Total number of tasks by status\"),\n448- &[\"status\"],\n449- )\n450- .expect(\"failed to create tasks_total counter\");\n451-\n452- let task_registry_size = Gauge::with_opts(\n453- Opts::new(\"miroir_task_registry_size\", \"Current number of tasks in the registry\"),\n454- )\n455- .expect(\"failed to create task_registry_size gauge\");\n456-\n457- // ── Scatter-gather metrics ──\n458- let scatter_fan_out_size = Histogram::with_opts(\n459- HistogramOpts::new(\"miroir_scatter_fan_out_size\", \"Number of nodes in scatter operations\")\n460- .buckets(vec![1.0, 2.0, 3.0, 5.0, 10.0, 20.0, 50.0]),\n461- )\n462- .expect(\"failed to create scatter_fan_out_size histogram\");\n463-\n464- let scatter_partial_responses = Counter::with_opts(\n465- Opts::new(\"miroir_scatter_partial_responses_total\", \"Number of scatter responses that were partial (some nodes failed)\"),\n466- )\n467- .expect(\"failed to create scatter_partial_responses counter\");\n468-\n469- let scatter_retries = Counter::with_opts(\n470- Opts::new(\"miroir_scatter_retries_total\", \"Number of scatter retry attempts due to node failures\"),\n471- )\n472- .expect(\"failed to create scatter_retries counter\");\n473-\n474- // ── Rebalancer metrics ──\n475- let rebalance_in_progress = Gauge::with_opts(\n476- Opts::new(\"miroir_rebalance_in_progress\", \"Whether a rebalance is currently running (1=yes, 0=no)\"),\n477- )\n478- .expect(\"failed to create rebalance_in_progress gauge\");\n479-\n480- let rebalance_documents_migrated = Counter::with_opts(\n481- Opts::new(\"miroir_rebalance_documents_migrated_total\", \"Total number of documents migrated during rebalance\"),\n482- )\n483- .expect(\"failed to create rebalance_documents_migrated counter\");\n484-\n485- let rebalance_duration = Histogram::with_opts(\n486- HistogramOpts::new(\"miroir_rebalance_duration_seconds\", \"Duration of rebalance operations\")\n487- .buckets(vec![1.0, 5.0, 10.0, 30.0, 60.0, 300.0, 600.0, 1800.0, 3600.0]),\n488- )\n489- .expect(\"failed to create rebalance_duration histogram\");\n490-\n491- // Register all metrics\n492- macro_rules! reg {\n493- ($m:expr) => {\n494- registry.register(Box::new($m.clone())).expect(concat!(\"failed to register \", stringify!($m)));\n495- };\n496- }\n497-\n498- reg!(request_duration);\n499- reg!(requests_total);\n500- reg!(requests_in_flight);\n501- reg!(node_healthy);\n502- reg!(node_request_duration);\n503- reg!(node_errors);\n504- reg!(shard_coverage);\n505- reg!(degraded_shards);\n506- reg!(shard_distribution);\n507- reg!(task_processing_age);\n508- reg!(tasks_total);\n509- reg!(task_registry_size);\n510- reg!(scatter_fan_out_size);\n511- reg!(scatter_partial_responses);\n512- reg!(scatter_retries);\n513- reg!(rebalance_in_progress);\n514- reg!(rebalance_documents_migrated);\n515- reg!(rebalance_duration);\n516-\n517- / ── §13.11 Multi-search metrics (cardinality cap: top 100 tenants, rest bucketed) ──\n518- let (\n519- multisearch_queries_per_batch,\n520- multisearch_batches_total,\n521- multisearch_partial_failures_total,\n522- multisearch_tenant_session_pin_override_total,\n523- ) = if config.multi_search.enabled {\n524- let q = Histogram::with_opts(\n525- HistogramOpts::new(\"miroir_multisearch_queries_per_batch\", \"Number of queries in each multi-search batch\")\n526- .buckets(vec![1.0, 2.0, 5.0, 10.0, 25.0, 50.0, 100.0]),\n527- ).expect(\"create multisearch_queries_per_batch\");\n528- let b = Counter::with_opts(\n529- Opts::new(\"miroir_multisearch_batches_total\", \"Total number of multi-search batches processed\"),\n--\n1221:impl Metrics {\n1222- // ── Scatter-gather ──\n1223-\n1224- pub fn record_scatter_fan_out(&self, size: u64) {\n1225- self.scatter_fan_out_size.observe(size as f64);\n1226- }\n1227-\n1228- pub fn inc_scatter_partial_responses(&self) {\n1229- self.scatter_partial_responses.inc();\n1230- }\n1231-\n1232- pub fn inc_scatter_retries(&self) {\n1233- self.scatter_retries.inc();\n1234- }\n1235-\n1236- // ── Node health ──\n1237-\n1238- pub fn set_node_healthy(&self, node_id: &str, healthy: bool) {\n1239- self.node_healthy.with_label_values(&[node_id]).set(if healthy { 1.0 } else { 0.0 });\n1240- }\n1241-\n1242- pub fn record_node_request_duration(&self, node_id: &str, operation: &str, duration_secs: f64) {\n1243- self.node_request_duration.with_label_values(&[node_id, operation]).observe(duration_secs);\n1244- }\n1245-\n1246- pub fn inc_node_errors(&self, node_id: &str, error_type: &str) {\n1247- self.node_errors.with_label_values(&[node_id, error_type]).inc();\n1248- }\n1249-\n1250- // ── Shards ──\n1251-\n1252- pub fn set_shard_coverage(&self, coverage: f64) {\n1253- self.shard_coverage.set(coverage);\n1254- }\n1255-\n1256- pub fn set_degraded_shards(&self, count: f64) {\n1257- self.degraded_shards.set(count);\n1258- }\n1259-\n1260- pub fn set_shard_distribution(&self, node_id: &str, count: f64) {\n1261- self.shard_distribution.with_label_values(&[node_id]).set(count);\n1262- }\n1263-\n1264- // ── Tasks ──\n1265-\n1266- pub fn observe_task_processing_age(&self, age_secs: f64) {\n1267- self.task_processing_age.observe(age_secs);\n1268- }\n1269-\n1270- pub fn inc_tasks_total(&self, status: &str) {\n1271- self.tasks_total.with_label_values(&[status]).inc();\n1272- }\n1273-\n1274- pub fn set_task_registry_size(&self, size: f64) {\n1275- self.task_registry_size.set(size);\n1276- }\n1277-\n1278- // ── Rebalancer ──\n1279-\n1280- pub fn set_rebalance_in_progress(&self, v: bool) {\n1281- self.rebalance_in_progress.set(if v { 1.0 } else { 0.0 });\n1282- }\n1283-\n1284- pub fn inc_rebalance_documents_migrated(&self, count: u64) {\n1285- self.rebalance_documents_migrated.inc_by(count as f64);\n1286- }\n1287-\n1288- pub fn observe_rebalance_duration(&self, secs: f64) {\n1289- self.rebalance_duration.observe(secs);\n1290- }\n1291-\n1292- // ── §13.11 Multi-search ──\n1293-\n1294- pub fn observe_multisearch_queries_per_batch(&self, count: u64) {\n1295- if let Some(ref m) = self.multisearch_queries_per_batch {\n1296- m.observe(count as f64);\n1297- }\n1298- }\n1299-\n1300- pub fn inc_multisearch_batches_total(&self) {\n1301- if let Some(ref m) = self.multisearch_batches_total {\n1302- m.inc();\n1303- }\n1304- }\n1305-\n1306- pub fn inc_multisearch_partial_failures(&self) {\n1307- if let Some(ref m) = self.multisearch_partial_failures_total {\n1308- m.inc();\n1309- }\n1310- }\n1311-\n1312- pub fn inc_multisearch_tenant_session_pin_override(&self, tenant: &str) {\n1313- if let Some(ref m) = self.multisearch_tenant_session_pin_override_total {\n1314- m.with_label_values(&[tenant]).inc();\n1315- }\n1316- }\n1317-\n1318- // ── §13.12 Vector search ──\n\n[Showing results with pagination = limit: 250]"}]},"parent_tool_use_id":null,"session_id":"117cfbb2-d192-47e4-94cf-6ac9c9c2ff6a","uuid":"4b780963-554e-47b4-94be-b146b0c69cc8","timestamp":"2026-05-23T05:05:01.415Z","tool_use_result":{"mode":"content","numFiles":0,"filenames":[],"content":"379:impl Metrics {\n380- pub fn new(config: &MiroirConfig) -> Self {\n381- let registry = Registry::new();\n382-\n383- // ── Request metrics ──\n384- let request_duration = HistogramVec::new(\n385- HistogramOpts::new(\"miroir_request_duration_seconds\", \"Request latency in seconds\")\n386- .buckets(vec![0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0, 10.0]),\n387- &[\"method\", \"path_template\", \"status\"],\n388- )\n389- .expect(\"failed to create request_duration histogram\");\n390-\n391- let requests_total = CounterVec::new(\n392- Opts::new(\"miroir_requests_total\", \"Total number of requests\"),\n393- &[\"method\", \"path_template\", \"status\"],\n394- )\n395- .expect(\"failed to create requests_total counter\");\n396-\n397- let requests_in_flight = Gauge::with_opts(\n398- Opts::new(\"miroir_requests_in_flight\", \"Number of requests currently being processed\"),\n399- )\n400- .expect(\"failed to create requests_in_flight gauge\");\n401-\n402- // ── Node health metrics ──\n403- let node_healthy = GaugeVec::new(\n404- Opts::new(\"miroir_node_healthy\", \"Health status of backend nodes (1=healthy, 0=unhealthy)\"),\n405- &[\"node_id\"],\n406- )\n407- .expect(\"failed to create node_healthy gauge\");\n408-\n409- let node_request_duration = HistogramVec::new(\n410- HistogramOpts::new(\"miroir_node_request_duration_seconds\", \"Latency of individual node requests\")\n411- .buckets(vec![0.001, 0.005, 0.01, 0.025, 0.05, 0.1, 0.5, 1.0]),\n412- &[\"node_id\", \"operation\"],\n413- )\n414- .expect(\"failed to create node_request_duration histogram\");\n415-\n416- let node_errors = CounterVec::new(\n417- Opts::new(\"miroir_node_errors_total\", \"Number of errors from backend nodes\"),\n418- &[\"node_id\", \"error_type\"],\n419- )\n420- .expect(\"failed to create node_errors counter\");\n421-\n422- // ── Shard metrics ──\n423- let shard_coverage = Gauge::with_opts(\n424- Opts::new(\"miroir_shard_coverage\", \"Fraction of shards with at least one healthy replica\"),\n425- )\n426- .expect(\"failed to create shard_coverage gauge\");\n427-\n428- let degraded_shards = Gauge::with_opts(\n429- Opts::new(\"miroir_degraded_shards_total\", \"Number of shards with reduced replica availability\"),\n430- )\n431- .expect(\"failed to create degraded_shards gauge\");\n432-\n433- let shard_distribution = GaugeVec::new(\n434- Opts::new(\"miroir_shard_distribution\", \"Number of shards assigned to each node\"),\n435- &[\"node_id\"],\n436- )\n437- .expect(\"failed to create shard_distribution gauge\");\n438-\n439- // ── Task metrics ──\n440- let task_processing_age = Histogram::with_opts(\n441- HistogramOpts::new(\"miroir_task_processing_age_seconds\", \"Time between task creation and processing start\")\n442- .buckets(vec![0.01, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0, 10.0, 30.0, 60.0]),\n443- )\n444- .expect(\"failed to create task_processing_age histogram\");\n445-\n446- let tasks_total = CounterVec::new(\n447- Opts::new(\"miroir_tasks_total\", \"Total number of tasks by status\"),\n448- &[\"status\"],\n449- )\n450- .expect(\"failed to create tasks_total counter\");\n451-\n452- let task_registry_size = Gauge::with_opts(\n453- Opts::new(\"miroir_task_registry_size\", \"Current number of tasks in the registry\"),\n454- )\n455- .expect(\"failed to create task_registry_size gauge\");\n456-\n457- // ── Scatter-gather metrics ──\n458- let scatter_fan_out_size = Histogram::with_opts(\n459- HistogramOpts::new(\"miroir_scatter_fan_out_size\", \"Number of nodes in scatter operations\")\n460- .buckets(vec![1.0, 2.0, 3.0, 5.0, 10.0, 20.0, 50.0]),\n461- )\n462- .expect(\"failed to create scatter_fan_out_size histogram\");\n463-\n464- let scatter_partial_responses = Counter::with_opts(\n465- Opts::new(\"miroir_scatter_partial_responses_total\", \"Number of scatter responses that were partial (some nodes failed)\"),\n466- )\n467- .expect(\"failed to create scatter_partial_responses counter\");\n468-\n469- let scatter_retries = Counter::with_opts(\n470- Opts::new(\"miroir_scatter_retries_total\", \"Number of scatter retry attempts due to node failures\"),\n471- )\n472- .expect(\"failed to create scatter_retries counter\");\n473-\n474- // ── Rebalancer metrics ──\n475- let rebalance_in_progress = Gauge::with_opts(\n476- Opts::new(\"miroir_rebalance_in_progress\", \"Whether a rebalance is currently running (1=yes, 0=no)\"),\n477- )\n478- .expect(\"failed to create rebalance_in_progress gauge\");\n479-\n480- let rebalance_documents_migrated = Counter::with_opts(\n481- Opts::new(\"miroir_rebalance_documents_migrated_total\", \"Total number of documents migrated during rebalance\"),\n482- )\n483- .expect(\"failed to create rebalance_documents_migrated counter\");\n484-\n485- let rebalance_duration = Histogram::with_opts(\n486- HistogramOpts::new(\"miroir_rebalance_duration_seconds\", \"Duration of rebalance operations\")\n487- .buckets(vec![1.0, 5.0, 10.0, 30.0, 60.0, 300.0, 600.0, 1800.0, 3600.0]),\n488- )\n489- .expect(\"failed to create rebalance_duration histogram\");\n490-\n491- // Register all metrics\n492- macro_rules! reg {\n493- ($m:expr) => {\n494- registry.register(Box::new($m.clone())).expect(concat!(\"failed to register \", stringify!($m)));\n495- };\n496- }\n497-\n498- reg!(request_duration);\n499- reg!(requests_total);\n500- reg!(requests_in_flight);\n501- reg!(node_healthy);\n502- reg!(node_request_duration);\n503- reg!(node_errors);\n504- reg!(shard_coverage);\n505- reg!(degraded_shards);\n506- reg!(shard_distribution);\n507- reg!(task_processing_age);\n508- reg!(tasks_total);\n509- reg!(task_registry_size);\n510- reg!(scatter_fan_out_size);\n511- reg!(scatter_partial_responses);\n512- reg!(scatter_retries);\n513- reg!(rebalance_in_progress);\n514- reg!(rebalance_documents_migrated);\n515- reg!(rebalance_duration);\n516-\n517- / ── §13.11 Multi-search metrics (cardinality cap: top 100 tenants, rest bucketed) ──\n518- let (\n519- multisearch_queries_per_batch,\n520- multisearch_batches_total,\n521- multisearch_partial_failures_total,\n522- multisearch_tenant_session_pin_override_total,\n523- ) = if config.multi_search.enabled {\n524- let q = Histogram::with_opts(\n525- HistogramOpts::new(\"miroir_multisearch_queries_per_batch\", \"Number of queries in each multi-search batch\")\n526- .buckets(vec![1.0, 2.0, 5.0, 10.0, 25.0, 50.0, 100.0]),\n527- ).expect(\"create multisearch_queries_per_batch\");\n528- let b = Counter::with_opts(\n529- Opts::new(\"miroir_multisearch_batches_total\", \"Total number of multi-search batches processed\"),\n--\n1221:impl Metrics {\n1222- // ── Scatter-gather ──\n1223-\n1224- pub fn record_scatter_fan_out(&self, size: u64) {\n1225- self.scatter_fan_out_size.observe(size as f64);\n1226- }\n1227-\n1228- pub fn inc_scatter_partial_responses(&self) {\n1229- self.scatter_partial_responses.inc();\n1230- }\n1231-\n1232- pub fn inc_scatter_retries(&self) {\n1233- self.scatter_retries.inc();\n1234- }\n1235-\n1236- // ── Node health ──\n1237-\n1238- pub fn set_node_healthy(&self, node_id: &str, healthy: bool) {\n1239- self.node_healthy.with_label_values(&[node_id]).set(if healthy { 1.0 } else { 0.0 });\n1240- }\n1241-\n1242- pub fn record_node_request_duration(&self, node_id: &str, operation: &str, duration_secs: f64) {\n1243- self.node_request_duration.with_label_values(&[node_id, operation]).observe(duration_secs);\n1244- }\n1245-\n1246- pub fn inc_node_errors(&self, node_id: &str, error_type: &str) {\n1247- self.node_errors.with_label_values(&[node_id, error_type]).inc();\n1248- }\n1249-\n1250- // ── Shards ──\n1251-\n1252- pub fn set_shard_coverage(&self, coverage: f64) {\n1253- self.shard_coverage.set(coverage);\n1254- }\n1255-\n1256- pub fn set_degraded_shards(&self, count: f64) {\n1257- self.degraded_shards.set(count);\n1258- }\n1259-\n1260- pub fn set_shard_distribution(&self, node_id: &str, count: f64) {\n1261- self.shard_distribution.with_label_values(&[node_id]).set(count);\n1262- }\n1263-\n1264- // ── Tasks ──\n1265-\n1266- pub fn observe_task_processing_age(&self, 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request_duration: HistogramVec,\n168- requests_total: CounterVec,\n169- requests_in_flight: Gauge,\n170-\n171- // ── Node health metrics ──\n172- node_healthy: GaugeVec,\n173- node_request_duration: HistogramVec,\n174- node_errors: CounterVec,\n175-\n176- // ── Shard metrics ──\n177- shard_coverage: Gauge,\n178- degraded_shards: Gauge,\n179- shard_distribution: GaugeVec,\n180-\n181- // ── Task metrics ──\n182- task_processing_age: Histogram,\n183- tasks_total: CounterVec,\n184- task_registry_size: Gauge,\n185-\n186- // ── Scatter-gather metrics ──\n187- scatter_fan_out_size: Histogram,\n188- scatter_partial_responses: Counter,\n189- scatter_retries: Counter,\n190-\n191- // ── Rebalancer metrics ──\n192- rebalance_in_progress: Gauge,\n193- rebalance_documents_migrated: Counter,\n194- rebalance_duration: Histogram,\n195-\n196- // ── §13.11 Multi-search metrics (feature-gated) ──\n197- multisearch_queries_per_batch: Option,\n198- multisearch_batches_total: Option,\n199- multisearch_partial_failures_total: Option,\n200- multisearch_tenant_session_pin_override_total: Option,\n201-\n202- // ── §13.12 Vector search metrics (feature-gated) ──\n203- vector_search_over_fetched_total: Option,\n204- vector_merge_strategy: Option,\n205- vector_embedder_drift_total: Option,\n206-\n207- // ── §13.13 CDC metrics (feature-gated) ──\n208- cdc_events_published_total: Option,\n209- cdc_lag_seconds: Option,\n210- cdc_buffer_bytes: Option,\n211- cdc_dropped_total: Option,\n212- cdc_events_suppressed_total: Option,\n213-\n214- // ── §13.14 TTL metrics (feature-gated) ──\n215- ttl_documents_expired_total: Option,\n216- ttl_sweep_duration_seconds: Option,\n217- ttl_pending_estimate: Option,\n218-\n219- // ── §13.15 Tenant affinity metrics (feature-gated) ──\n220- tenant_queries_total: Option,\n221- tenant_pinned_groups: Option,\n222- tenant_fallback_total: Option,\n223-\n224- // ── §13.16 Shadow traffic metrics (feature-gated) ──\n225- shadow_diff_total: Option,\n226- 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HistogramVec,\n168- requests_total: CounterVec,\n169- requests_in_flight: Gauge,\n170-\n171- // ── Node health metrics ──\n172- node_healthy: GaugeVec,\n173- node_request_duration: HistogramVec,\n174- node_errors: CounterVec,\n175-\n176- // ── Shard metrics ──\n177- shard_coverage: Gauge,\n178- degraded_shards: Gauge,\n179- shard_distribution: GaugeVec,\n180-\n181- // ── Task metrics ──\n182- task_processing_age: Histogram,\n183- tasks_total: CounterVec,\n184- task_registry_size: Gauge,\n185-\n186- // ── Scatter-gather metrics ──\n187- scatter_fan_out_size: Histogram,\n188- scatter_partial_responses: Counter,\n189- scatter_retries: Counter,\n190-\n191- // ── Rebalancer metrics ──\n192- rebalance_in_progress: Gauge,\n193- rebalance_documents_migrated: Counter,\n194- rebalance_duration: Histogram,\n195-\n196- // ── §13.11 Multi-search metrics (feature-gated) ──\n197- multisearch_queries_per_batch: Option,\n198- multisearch_batches_total: Option,\n199- multisearch_partial_failures_total: 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Let me break down what needs to be done:\n\n1. Create a headless Service in Helm (`miroir-headless.yaml`)\n2. Update the Deployment to inject POD_NAME and POD_IP via Downward API\n3. Implement SRV lookup in Rust to discover peers\n4. Add a `peer_discovery.refresh_interval_s` config option\n5. Create a `PeerSet` struct and `refresh_peers` function\n6. 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adminSessionSealKey: \"\" # 64-byte base64 key for sealing admin session cookies; auto-generated if empty (plan §9)\n40\t searchUiJwtSecret: \"\" # HMAC secret for search UI JWTs; auto-generated when search_ui.enabled=true (plan §9)\n41\t searchUiJwtSecretPrevious: \"\" # Previous JWT secret during rotation overlap window (plan §9)\n42\t searchUiSharedKey: \"\" # Shared key for X-Search-UI-Key header when search_ui.auth.mode=shared_key (plan §9)\n43\t logLevel: info # RUST_LOG: trace, debug, info, warn, error\n44\t existingSecret: \"\" # name of K8s Secret with masterKey, nodeMasterKey, adminApiKey\n45\t podAnnotations: {}\n46\t podLabels: {}\n47\t resources:\n48\t limits:\n49\t cpu: 2000m\n50\t memory: 3584Mi # 3.5 GiB (leaves headroom under 3.75 GB envelope)\n51\t requests:\n52\t cpu: 500m\n53\t memory: 1Gi\n54\t nodeSelector: {}\n55\t tolerations: []\n56\t affinity: {}\n57\t cdc:\n58\t enabled: true\n59\t emit_ttl_deletes: false\n60\t emit_internal_writes: false\n61\t buffer:\n62\t primary: memory # memory | pvc | redis\n63\t overflow: drop # drop | pvc | redis\n64\t pvc_size: 10Gi\n65\t pvc_storage_class: \"\"\n66\t memory_bytes: 67108864\n67\t # §14.8 Resource-aware configuration defaults\n68\t # All defaults sized for 2 vCPU / 3.75 GB envelope\n69\t server:\n70\t max_body_bytes: 104857600 # 100 MiB per request\n71\t max_concurrent_requests: 500\n72\t request_timeout_ms: 30000\n73\t connection_pool_per_node:\n74\t max_idle: 32\n75\t max_total: 128\n76\t idle_timeout_s: 60\n77\t task_registry:\n78\t cache_size: 10000\n79\t redis_pool_max: 50\n80\t ttl_seconds: 604800 # 7 days\n81\t prune_interval_s: 300\n82\t prune_batch_size: 10000\n83\t idempotency:\n84\t enabled: true\n85\t max_cached_keys: 1000000 # ~100 MB\n86\t ttl_seconds: 86400\n87\t session_pinning:\n88\t enabled: true\n89\t ttl_seconds: 900\n90\t max_sessions: 100000 # ~50 MB\n91\t wait_strategy: block # block | route_pin\n92\t max_wait_ms: 5000\n93\t query_coalescing:\n94\t enabled: true\n95\t window_ms: 50\n96\t max_subscribers: 1000\n97\t max_pending_queries: 10000\n98\t anti_entropy:\n99\t enabled: true\n100\t schedule: every 6h\n101\t shards_per_pass: 0 # 0 = all shards\n102\t max_read_concurrency: 2\n103\t fingerprint_batch_size: 1000\n104\t auto_repair: true\n105\t updated_at_field: _miroir_updated_at\n106\t resharding:\n107\t enabled: true\n108\t backfill_concurrency: 4\n109\t backfill_batch_size: 1000\n110\t throttle_docs_per_sec: 0 # 0 = no throttle\n111\t verify_before_swap: true\n112\t retain_old_index_hours: 48\n113\t allowed_windows: [] # e.g., [\"22:00-04:00 UTC\"]\n114\t peer_discovery:\n115\t service_name: \"\" # default: \"-headless\" (auto-derived from release name)\n116\t refresh_interval_s: 15\n117\t leader_election:\n118\t enabled: true # auto-true when replicas > 1\n119\t lease_ttl_s: 10\n120\t renew_interval_s: 3\n121\t\n122\tsearch_ui:\n123\t enabled: true\n124\t scoped_key_max_age_days: 60 # Maximum lifetime of a scoped Meilisearch key (days)\n125\t scoped_key_rotate_before_expiry_days: 30 # Rotate this many days before max_age (must be < max_age)\n126\t scoped_key_rotation_drain_s: 120 # Seconds to wait for all pods to observe new key before revoking old\n127\t\n128\tadmin_ui:\n129\t enabled: true\n130\t path: \"/_miroir/admin\"\n131\t auth: key # key | oauth (future) | none (dev only)\n132\t session_ttl_s: 3600 # 1 hour\n133\t read_only_mode: false\n134\t allowed_origins:\n135\t - \"same-origin\"\n136\t cors_allowed_origins: []\n137\t rate_limit:\n138\t per_ip: \"10/minute\" # Rate limit per source IP\n139\t backend: redis # redis | local (schema enforces redis when replicas > 1)\n140\t redis_key_prefix: \"miroir:ratelimit:adminlogin:\"\n141\t redis_ttl_s: 60\n142\t failed_attempt_threshold: 5 # Consecutive failures before exponential backoff\n143\t backoff_start_minutes: 10 # Initial backoff after threshold\n144\t backoff_max_hours: 24 # Maximum backoff cap\n145\t\n146\ttaskStore:\n147\t backend: sqlite # sqlite | redis\n148\t path: /data/miroir-tasks.db\n149\t url: \"\" # for redis: redis://host:6379\n150\t\n151\t# Horizontal Pod Autoscaler (disabled by default for dev)\n152\thpa:\n153\t enabled: false\n154\t minReplicas: 2\n155\t maxReplicas: 10\n156\t targetCPUUtilizationPercentage: 70\n157\t targetMemoryUtilizationPercentage: 80\n158\t behavior:\n159\t scaleDown:\n160\t stabilizationWindowSeconds: 300\n161\t policies:\n162\t - type: Percent\n163\t value: 50\n164\t periodSeconds: 60\n165\t scaleUp:\n166\t stabilizationWindowSeconds: 0\n167\t policies:\n168\t - type: Percent\n169\t value: 100\n170\t periodSeconds: 30\n171\t - type: Pods\n172\t value: 2\n173\t periodSeconds: 60\n174\t selectPolicy: Max\n175\t\n176\t# ServiceAccount\n177\tserviceAccount:\n178\t create: true\n179\t name: \"\" # defaults to release name\n180\t annotations: {}\n181\t\n182\t# Services\n183\tservice:\n184\t type: ClusterIP\n185\t annotations: {}\n186\t ports:\n187\t http: 7700\n188\t metrics: 9090\n189\t\n190\theadless:\n191\t annotations: {}\n192\t\n193\t# Meilisearch StatefulSet\n194\tmeilisearch:\n195\t enabled: true\n196\t image:\n197\t repository: getmeilisearch/meilisearch\n198\t tag: v1.12\n199\t pullPolicy: IfNotPresent\n200\t replicas: 2 # 1 group × 2 nodes (dev default)\n201\t nodesPerGroup: 2 # nodes per replica group\n202\t podAnnotations: {}\n203\t podLabels: {}\n204\t resources:\n205\t limits:\n206\t cpu: 2000m\n207\t memory: 2Gi\n208\t requests:\n209\t cpu: 500m\n210\t memory: 1Gi\n211\t nodeSelector: {}\n212\t tolerations: []\n213\t affinity: {}\n214\t persistence:\n215\t enabled: true\n216\t size: 10Gi\n217\t storageClass: \"\" # uses default storage class\n218\t env: []\n219\t masterKey: \"\" # defaults to auto-generated; NOT zero-downtime rotatable (fixed at process start)\n220\t\n221\t# Redis deployment (only when taskStore.backend=redis)\n222\tredis:\n223\t enabled: false # dev default: enable for production\n224\t image:\n225\t repository: redis\n226\t tag: 7.4-alpine\n227\t pullPolicy: IfNotPresent\n228\t replicas: 1\n229\t podAnnotations: {}\n230\t podLabels: {}\n231\t resources:\n232\t limits:\n233\t cpu: 500m\n234\t memory: 512Mi\n235\t requests:\n236\t cpu: 100m\n237\t memory: 128Mi\n238\t nodeSelector: {}\n239\t tolerations: []\n240\t affinity: {}\n241\t persistence:\n242\t enabled: true\n243\t size: 5Gi\n244\t storageClass: \"\"\n245\t service:\n246\t type: ClusterIP\n247\t port: 6379\n248\t auth:\n249\t enabled: true\n250\t existingSecret: \"\" # auto-generated as -redis-secret when empty; password comes from K8s Secret or ESO\n251\t\n252\t# Prometheus Operator integration (plan §10 + §14.9)\n253\tserviceMonitor:\n254\t enabled: false # requires prometheus-operator in cluster\n255\t interval: 30s\n256\t annotations: {}\n257\t\n258\tprometheusRule:\n259\t enabled: false # requires prometheus-operator in cluster\n260\t annotations: {}\n261\t\n262\t# Grafana dashboard ConfigMap (requires grafana-dashboard sidecar)\n263\tdashboards:\n264\t enabled: false # creates a ConfigMap labeled grafana_dashboard=1\n265\t annotations: {}\n266\t\n267\t# OpenTelemetry tracing (plan §10)\n268\ttracing:\n269\t enabled: false # disabled by default for zero overhead\n270\t endpoint: \"http://tempo.monitoring.svc:4317\" # OTLP gRPC endpoint\n271\t serviceName: \"miroir\" # service name for trace identification\n272\t sampleRate: 0.1 # head-based sampling: 0.1 = ~10% of requests traced\n273\t\n274\t# External Secrets Operator integration (plan §6 + §9)\n275\t# When enabled, ESO pulls secrets from OpenBao via ClusterSecretStore.\n276\t# Set miroir.existingSecret to \"-secret\" to use the ESO-managed Secret.\n277\teso:\n278\t enabled: false # disabled by default; enable for production with OpenBao\n279\t refreshInterval: \"15m\" # how often ESO re-syncs from the backend\n280\t secretStoreRef:\n281\t name: \"openbao-backend\" # ClusterSecretStore name in the cluster\n282\t kind: \"ClusterSecretStore\"\n283\t secretPath: \"kv/search/miroir\" # OpenBao KV v2 path\n284\t includePreviousJwt: false # set true during JWT rotation overlap window\n285\t includeSharedKey: false # set true when search_ui.auth.mode=shared_key\n286\t includeRedisPassword: false # set true when redis.auth.enabled=true\n287\t"}]},"parent_tool_use_id":null,"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","uuid":"32e9da6e-0cbc-48a2-a30b-687d7e115644","timestamp":"2026-05-23T06:48:31.637Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/charts/miroir/values.yaml","content":"# Miroir Helm Chart Values\n# These defaults boot a working single-pod install for evaluation and CI.\n# For production, override to: replicas=2+, replicationFactor=2, replicaGroups=2,\n# taskStore.backend=redis, redis.enabled=true, hpa.enabled=true\n#\n# SECRET INVENTORY (plan §9):\n# ┌──────────────────────────┬───────────────────────────────┬─────────────────────┐\n# │ Secret │ Managed by │ Rotation │\n# ├──────────────────────────┼───────────────────────────────┼─────────────────────┤\n# │ masterKey │ Helm / ESO │ Manual key change │\n# │ nodeMasterKey │ Helm / ESO │ Zero-downtime (§9) │\n# │ MEILI_MASTER_KEY │ Helm / ESO │ Pod restart only │\n# │ adminApiKey │ Helm / ESO │ Manual + restart │\n# │ adminSessionSealKey │ Helm / ESO │ Manual + restart │\n# │ searchUiJwtSecret │ Helm / ESO │ Zero-downtime (§9) │\n# │ searchUiJwtSecretPrev │ Helm / ESO │ Overlap window │\n# │ searchUiSharedKey │ Helm / ESO │ Manual + restart │\n# │ redis_password │ Helm / ESO │ Manual + restart │\n# │ ghcr_credentials │ Argo Workflows (CI only) │ Manual │\n# │ github_token │ Argo Workflows (CI only) │ Manual │\n# └──────────────────────────┴───────────────────────────────┴─────────────────────┘\n# ghcr_credentials and github_token are NOT in this chart — they belong to the\n# Argo Workflows service account in the iad-ci cluster (see CLAUDE.md CI/CD section).\n# MEILI_MASTER_KEY is set at Meilisearch process start and cannot be rotated\n# without a pod restart (documented in the Meilisearch docs).\n\nmiroir:\n image:\n repository: ghcr.io/jedarden/miroir\n tag: \"\" # defaults to Chart.appVersion\n pullPolicy: IfNotPresent\n replicas: 1 # dev default: override to 2+ in production (requires taskStore.backend=redis)\n shards: 64\n replicationFactor: 1 # dev default: override to 2 in production\n replicaGroups: 1 # dev default: override to 2 in production\n masterKey: \"\" # auto-generated if empty; ignored when existingSecret is set\n nodeMasterKey: \"\" # auto-generated if empty; admin-scoped key for Meilisearch nodes (plan §9 Model B)\n adminApiKey: \"\" # auto-generated if empty; ignored when existingSecret is set\n adminSessionSealKey: \"\" # 64-byte base64 key for sealing admin session cookies; auto-generated if empty (plan §9)\n searchUiJwtSecret: \"\" # HMAC secret for search UI JWTs; auto-generated when search_ui.enabled=true (plan §9)\n searchUiJwtSecretPrevious: \"\" # Previous JWT secret during rotation overlap window (plan §9)\n searchUiSharedKey: \"\" # Shared key for X-Search-UI-Key header when search_ui.auth.mode=shared_key (plan §9)\n logLevel: info # RUST_LOG: trace, debug, info, warn, error\n existingSecret: \"\" # name of K8s Secret with masterKey, nodeMasterKey, adminApiKey\n podAnnotations: {}\n podLabels: {}\n resources:\n limits:\n cpu: 2000m\n memory: 3584Mi # 3.5 GiB (leaves headroom under 3.75 GB envelope)\n requests:\n cpu: 500m\n memory: 1Gi\n nodeSelector: {}\n tolerations: []\n affinity: {}\n cdc:\n enabled: true\n emit_ttl_deletes: false\n emit_internal_writes: false\n buffer:\n primary: memory # memory | pvc | redis\n overflow: drop # drop | pvc | redis\n pvc_size: 10Gi\n pvc_storage_class: \"\"\n memory_bytes: 67108864\n # §14.8 Resource-aware configuration defaults\n # All defaults sized for 2 vCPU / 3.75 GB envelope\n server:\n max_body_bytes: 104857600 # 100 MiB per request\n max_concurrent_requests: 500\n request_timeout_ms: 30000\n connection_pool_per_node:\n max_idle: 32\n max_total: 128\n idle_timeout_s: 60\n task_registry:\n cache_size: 10000\n redis_pool_max: 50\n ttl_seconds: 604800 # 7 days\n prune_interval_s: 300\n prune_batch_size: 10000\n idempotency:\n enabled: true\n max_cached_keys: 1000000 # ~100 MB\n ttl_seconds: 86400\n session_pinning:\n enabled: true\n ttl_seconds: 900\n max_sessions: 100000 # ~50 MB\n wait_strategy: block # block | route_pin\n max_wait_ms: 5000\n query_coalescing:\n enabled: true\n window_ms: 50\n max_subscribers: 1000\n max_pending_queries: 10000\n anti_entropy:\n enabled: true\n schedule: every 6h\n shards_per_pass: 0 # 0 = all shards\n max_read_concurrency: 2\n fingerprint_batch_size: 1000\n auto_repair: true\n updated_at_field: _miroir_updated_at\n resharding:\n enabled: true\n backfill_concurrency: 4\n backfill_batch_size: 1000\n throttle_docs_per_sec: 0 # 0 = no throttle\n verify_before_swap: true\n retain_old_index_hours: 48\n allowed_windows: [] # e.g., [\"22:00-04:00 UTC\"]\n peer_discovery:\n service_name: \"\" # default: \"-headless\" (auto-derived from release name)\n refresh_interval_s: 15\n leader_election:\n enabled: true # auto-true when replicas > 1\n lease_ttl_s: 10\n renew_interval_s: 3\n\nsearch_ui:\n enabled: true\n scoped_key_max_age_days: 60 # Maximum lifetime of a scoped Meilisearch key (days)\n scoped_key_rotate_before_expiry_days: 30 # Rotate this many days before max_age (must be < max_age)\n scoped_key_rotation_drain_s: 120 # Seconds to wait for all pods to observe new key before revoking old\n\nadmin_ui:\n enabled: true\n path: \"/_miroir/admin\"\n auth: key # key | oauth (future) | none (dev only)\n session_ttl_s: 3600 # 1 hour\n read_only_mode: false\n allowed_origins:\n - \"same-origin\"\n cors_allowed_origins: []\n rate_limit:\n per_ip: \"10/minute\" # Rate limit per source IP\n backend: redis # redis | local (schema enforces redis when replicas > 1)\n redis_key_prefix: \"miroir:ratelimit:adminlogin:\"\n redis_ttl_s: 60\n failed_attempt_threshold: 5 # Consecutive failures before exponential backoff\n backoff_start_minutes: 10 # Initial backoff after threshold\n backoff_max_hours: 24 # Maximum backoff cap\n\ntaskStore:\n backend: sqlite # sqlite | redis\n path: /data/miroir-tasks.db\n url: \"\" # for redis: redis://host:6379\n\n# Horizontal Pod Autoscaler (disabled by default for dev)\nhpa:\n enabled: false\n minReplicas: 2\n maxReplicas: 10\n targetCPUUtilizationPercentage: 70\n targetMemoryUtilizationPercentage: 80\n behavior:\n scaleDown:\n stabilizationWindowSeconds: 300\n policies:\n - type: Percent\n value: 50\n periodSeconds: 60\n scaleUp:\n stabilizationWindowSeconds: 0\n policies:\n - type: Percent\n value: 100\n periodSeconds: 30\n - type: Pods\n value: 2\n periodSeconds: 60\n selectPolicy: Max\n\n# ServiceAccount\nserviceAccount:\n create: true\n name: \"\" # defaults to release name\n annotations: {}\n\n# Services\nservice:\n type: ClusterIP\n annotations: {}\n ports:\n http: 7700\n metrics: 9090\n\nheadless:\n annotations: {}\n\n# Meilisearch StatefulSet\nmeilisearch:\n enabled: true\n image:\n repository: getmeilisearch/meilisearch\n tag: v1.12\n pullPolicy: IfNotPresent\n replicas: 2 # 1 group × 2 nodes (dev default)\n nodesPerGroup: 2 # nodes per replica group\n podAnnotations: {}\n podLabels: {}\n resources:\n limits:\n cpu: 2000m\n memory: 2Gi\n requests:\n cpu: 500m\n memory: 1Gi\n nodeSelector: {}\n tolerations: []\n affinity: {}\n persistence:\n enabled: true\n size: 10Gi\n storageClass: \"\" # uses default storage class\n env: []\n masterKey: \"\" # defaults to auto-generated; NOT zero-downtime rotatable (fixed at process start)\n\n# Redis deployment (only when taskStore.backend=redis)\nredis:\n enabled: false # dev default: enable for production\n image:\n repository: redis\n tag: 7.4-alpine\n pullPolicy: IfNotPresent\n replicas: 1\n podAnnotations: {}\n podLabels: {}\n resources:\n limits:\n cpu: 500m\n memory: 512Mi\n requests:\n cpu: 100m\n memory: 128Mi\n nodeSelector: {}\n tolerations: []\n affinity: {}\n persistence:\n enabled: true\n size: 5Gi\n storageClass: \"\"\n service:\n type: ClusterIP\n port: 6379\n auth:\n enabled: true\n existingSecret: \"\" # auto-generated as -redis-secret when empty; password comes from K8s Secret or ESO\n\n# Prometheus Operator integration (plan §10 + §14.9)\nserviceMonitor:\n enabled: false # requires prometheus-operator in cluster\n interval: 30s\n annotations: {}\n\nprometheusRule:\n enabled: false # requires prometheus-operator in cluster\n annotations: {}\n\n# Grafana dashboard ConfigMap (requires grafana-dashboard sidecar)\ndashboards:\n enabled: false # creates a ConfigMap labeled grafana_dashboard=1\n annotations: {}\n\n# OpenTelemetry tracing (plan §10)\ntracing:\n enabled: false # disabled by default for zero overhead\n endpoint: \"http://tempo.monitoring.svc:4317\" # OTLP gRPC endpoint\n serviceName: \"miroir\" # service name for trace identification\n sampleRate: 0.1 # head-based sampling: 0.1 = ~10% of requests traced\n\n# External Secrets Operator integration (plan §6 + §9)\n# When enabled, ESO pulls secrets from OpenBao via ClusterSecretStore.\n# Set miroir.existingSecret to \"-secret\" to use the ESO-managed Secret.\neso:\n enabled: false # disabled by default; enable for production with OpenBao\n refreshInterval: \"15m\" # how often ESO re-syncs from the backend\n secretStoreRef:\n name: \"openbao-backend\" # ClusterSecretStore name in the cluster\n kind: \"ClusterSecretStore\"\n secretPath: \"kv/search/miroir\" # OpenBao KV v2 path\n includePreviousJwt: false # set true during JWT rotation overlap window\n includeSharedKey: false # set true when search_ui.auth.mode=shared_key\n includeRedisPassword: false # set true when redis.auth.enabled=true\n","numLines":287,"startLine":1,"totalLines":287}}} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_f12b8be8bcee4d7ebbdef644","type":"tool_result","content":"total 112\ndrwxr-xr-x 2 coding users 4096 May 23 02:37 .\ndrwxr-xr-x 6 coding users 4096 May 23 02:37 ..\n-rw-r--r-- 1 coding users 12585 May 23 02:37 _helpers.tpl\n-rw-r--r-- 1 coding users 1032 May 19 20:53 meilisearch-service.yaml\n-rw-r--r-- 1 coding users 3470 May 19 20:53 meilisearch-statefulset.yaml\n-rw-r--r-- 1 coding users 327 May 19 20:53 miroir-configmap.yaml\n-rw-r--r-- 1 coding users 5863 May 23 02:33 miroir-deployment.yaml\n-rw-r--r-- 1 coding users 3574 May 19 20:53 miroir-externalsecret.yaml\n-rw-r--r-- 1 coding users 545 May 19 20:53 miroir-grafana-dashboard.yaml\n-rw-r--r-- 1 coding users 670 May 19 20:53 miroir-headless.yaml\n-rw-r--r-- 1 coding users 1149 May 19 20:53 miroir-hpa.yaml\n-rw-r--r-- 1 coding users 5667 May 19 20:53 miroir-prometheusrule.yaml\n-rw-r--r-- 1 coding users 655 May 19 20:53 miroir-pvc.yaml\n-rw-r--r-- 1 coding users 488 May 19 20:53 miroir-redis-secret.yaml\n-rw-r--r-- 1 coding users 1346 May 19 20:53 miroir-rotate-jwt-cronjob.yaml\n-rw-r--r-- 1 coding users 2182 May 19 20:53 miroir-secret.yaml\n-rw-r--r-- 1 coding users 764 May 19 20:53 miroir-servicemonitor.yaml\n-rw-r--r-- 1 coding users 782 May 19 20:53 miroir-service.yaml\n-rw-r--r-- 1 coding users 205 May 19 20:53 miroir-validate.yaml\n-rw-r--r-- 1 coding users 919 May 20 06:39 NOTES.txt\n-rw-r--r-- 1 coding users 4131 May 20 06:39 redis-deployment.yaml\n-rw-r--r-- 1 coding users 342 May 20 06:39 serviceaccount.yaml","is_error":false}]},"parent_tool_use_id":null,"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","uuid":"7161904c-18a2-43ab-b129-70ada341dc36","timestamp":"2026-05-23T06:48:31.652Z","tool_use_result":{"stdout":"total 112\ndrwxr-xr-x 2 coding users 4096 May 23 02:37 .\ndrwxr-xr-x 6 coding users 4096 May 23 02:37 ..\n-rw-r--r-- 1 coding users 12585 May 23 02:37 _helpers.tpl\n-rw-r--r-- 1 coding users 1032 May 19 20:53 meilisearch-service.yaml\n-rw-r--r-- 1 coding users 3470 May 19 20:53 meilisearch-statefulset.yaml\n-rw-r--r-- 1 coding users 327 May 19 20:53 miroir-configmap.yaml\n-rw-r--r-- 1 coding users 5863 May 23 02:33 miroir-deployment.yaml\n-rw-r--r-- 1 coding users 3574 May 19 20:53 miroir-externalsecret.yaml\n-rw-r--r-- 1 coding users 545 May 19 20:53 miroir-grafana-dashboard.yaml\n-rw-r--r-- 1 coding users 670 May 19 20:53 miroir-headless.yaml\n-rw-r--r-- 1 coding users 1149 May 19 20:53 miroir-hpa.yaml\n-rw-r--r-- 1 coding users 5667 May 19 20:53 miroir-prometheusrule.yaml\n-rw-r--r-- 1 coding users 655 May 19 20:53 miroir-pvc.yaml\n-rw-r--r-- 1 coding users 488 May 19 20:53 miroir-redis-secret.yaml\n-rw-r--r-- 1 coding users 1346 May 19 20:53 miroir-rotate-jwt-cronjob.yaml\n-rw-r--r-- 1 coding users 2182 May 19 20:53 miroir-secret.yaml\n-rw-r--r-- 1 coding users 764 May 19 20:53 miroir-servicemonitor.yaml\n-rw-r--r-- 1 coding users 782 May 19 20:53 miroir-service.yaml\n-rw-r--r-- 1 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Peer discovery via Kubernetes headless Service SRV records (plan §14.5).\n2\t//!\n3\t//! This module provides zero-config peer discovery for Miroir pods in the same\n4\t//! Deployment. Each pod periodically performs an SRV lookup against the headless\n5\t//! Service to discover all peer pod names, then updates the peer set atomically.\n6\t//!\n7\t//! # Peer Identity\n8\t//!\n9\t//! - `PeerId = POD_NAME` (the pod name injected via Downward API)\n10\t//! - The headless Service SRV record returns a list of `{target, port}` entries\n11\t//! - The `target` field contains the pod DNS name (e.g., `miroir-miroir-0.miroir-headless.default.svc.cluster.local`)\n12\t//! - We extract the pod name from the first component of the target\n13\t//!\n14\t//! # Usage\n15\t//!\n16\t//! ```no_run\n17\t//! use miroir_core::peer_discovery::{PeerDiscovery, PeerId};\n18\t//! use std::sync::Arc;\n19\t//!\n20\t//! #[tokio::main]\n21\t//! async fn main() {\n22\t//! let pod_name = std::env::var(\"POD_NAME\").unwrap();\n23\t//! let namespace = std::env::var(\"POD_NAMESPACE\").unwrap();\n24\t//! let service_name = \"miroir-headless\";\n25\t//!\n26\t//! let discovery = PeerDiscovery::new(\n27\t//! pod_name,\n28\t//! namespace,\n29\t//! service_name.to_string(),\n30\t//! );\n31\t//!\n32\t//! // Refresh peers\n33\t//! let peers = discovery.refresh().await;\n34\t//! println!(\"Discovered {} peers\", peers.peers.len());\n35\t//! }\n36\t//! ```\n37\t\n38\tuse crate::error::{MiroirError, Result};\n39\tuse serde::{Deserialize, Serialize};\n40\tuse std::sync::Arc;\n41\tuse std::time::Instant;\n42\tuse tokio::sync::RwLock;\n43\t\n44\t/// Unique identifier for a peer pod.\n45\t///\n46\t/// This is simply the pod name (e.g., `miroir-miroir-0`).\n47\tpub type PeerId = String;\n48\t\n49\t/// The current set of discovered peers with metadata.\n50\t#[derive(Debug, Clone, Serialize, Deserialize)]\n51\tpub struct PeerSet {\n52\t /// List of peer pod names (including self).\n53\t pub peers: Vec,\n54\t /// Instant when this peer set was last refreshed.\n55\t #[serde(skip, default = \"Instant::now\")]\n56\t pub refreshed_at: Instant,\n57\t}\n58\t\n59\timpl PeerSet {\n60\t /// Create a new peer set.\n61\t pub fn new(peers: Vec) -> Self {\n62\t Self {\n63\t peers,\n64\t refreshed_at: Instant::now(),\n65\t }\n66\t }\n67\t\n68\t /// Count of peers in the set.\n69\t pub fn len(&self) -> usize {\n70\t self.peers.len()\n71\t }\n72\t\n73\t /// Whether the peer set is empty.\n74\t pub fn is_empty(&self) -> bool {\n75\t self.peers.is_empty()\n76\t }\n77\t}\n78\t\n79\t/// Peer discovery via Kubernetes headless Service.\n80\tpub struct PeerDiscovery {\n81\t /// Our own pod name (injected via Downward API).\n82\t pod_name: PeerId,\n83\t /// Kubernetes namespace (injected via Downward API).\n84\t namespace: String,\n85\t /// Headless Service name (e.g., \"miroir-headless\").\n86\t service_name: String,\n87\t /// Current peer set.\n88\t peer_set: Arc>,\n89\t}\n90\t\n91\timpl PeerDiscovery {\n92\t /// Create a new peer discovery instance.\n93\t ///\n94\t /// # Arguments\n95\t ///\n96\t /// * `pod_name` - Our pod name (from `POD_NAME` env var)\n97\t /// * `namespace` - Kubernetes namespace (from `POD_NAMESPACE` env var)\n98\t /// * `service_name` - Headless Service name (e.g., \"miroir-headless\")\n99\t pub fn new(pod_name: String, namespace: String, service_name: String) -> Self {\n100\t Self {\n101\t pod_name,\n102\t namespace,\n103\t service_name,\n104\t peer_set: Arc::new(RwLock::new(PeerSet::new(Vec::new()))),\n105\t }\n106\t }\n107\t\n108\t /// Get the current peer set.\n109\t pub async fn peers(&self) -> Vec {\n110\t self.peer_set.read().await.peers.clone()\n111\t }\n112\t\n113\t /// Get the peer set count.\n114\t pub async fn peer_count(&self) -> usize {\n115\t self.peer_set.read().await.len()\n116\t }\n117\t\n118\t /// Refresh the peer set by performing an SRV lookup (plan §14.5).\n119\t ///\n120\t /// This resolves `_http._tcp...svc.cluster.local`\n121\t /// and extracts pod names from the returned targets. Uses the system\n122\t /// DNS resolver configuration from /etc/resolv.conf for maximum\n123\t /// compatibility across different Kubernetes distributions.\n124\t ///\n125\t /// Returns the updated peer set.\n126\t #[cfg(feature = \"peer-discovery\")]\n127\t pub async fn refresh(&self) -> Result {\n128\t let srv_name = format!(\n129\t \"_http._tcp.{}.{}.svc.cluster.local\",\n130\t self.service_name, self.namespace\n131\t );\n132\t\n133\t // Perform SRV lookup using blocking task\n134\t // Use trust-dns-resolver with system configuration (reads /etc/resolv.conf)\n135\t // This works across all Kubernetes clusters without hardcoded DNS IPs\n136\t use trust_dns_resolver::config::{ResolverConfig, ResolverOpts};\n137\t use trust_dns_resolver::Resolver;\n138\t\n139\t let lookup = tokio::task::spawn_blocking(move || {\n140\t // Use system resolver config from /etc/resolv.conf (plan §14.5)\n141\t let resolver = Resolver::new(ResolverConfig::default(), ResolverOpts::default())\n142\t .map_err(|e| MiroirError::Discovery(format!(\"failed to create DNS resolver: {}\", e)))?;\n143\t\n144\t resolver.srv_lookup(&srv_name)\n145\t .map_err(|e| MiroirError::Discovery(format!(\"SRV lookup failed for {}: {}\", srv_name, e)))\n146\t })\n147\t .await\n148\t .map_err(|e| MiroirError::Discovery(format!(\"SRV lookup task failed: {}\", e)))??;\n149\t\n150\t // Extract pod names from SRV targets\n151\t // Each SRV record has a target like \"miroir-miroir-0.miroir-headless.default.svc.cluster.local\"\n152\t // We extract the first component as the pod name.\n153\t let mut peers: Vec = lookup\n154\t .iter()\n155\t .filter_map(|srv| {\n156\t let target = srv.target().to_string();\n157\t // Remove trailing dot if present\n158\t let target = target.strip_suffix('.').unwrap_or(&target);\n159\t // Split and take first component, skip empty strings\n160\t target.split('.').next().filter(|s| !s.is_empty()).map(|s| s.to_string())\n161\t })\n162\t .collect();\n163\t\n164\t // Sort for deterministic ordering\n165\t peers.sort();\n166\t\n167\t // Update peer set\n168\t let new_peer_set = PeerSet::new(peers);\n169\t *self.peer_set.write().await = new_peer_set.clone();\n170\t\n171\t Ok(new_peer_set)\n172\t }\n173\t\n174\t /// Refresh the peer set (fallback when peer-discovery feature is disabled).\n175\t #[cfg(not(feature = \"peer-discovery\"))]\n176\t pub async fn refresh(&self) -> Result {\n177\t Err(MiroirError::Discovery(\n178\t \"peer-discovery feature is disabled\".to_string(),\n179\t ))\n180\t }\n181\t\n182\t /// Get our own pod name.\n183\t pub fn pod_name(&self) -> &str {\n184\t &self.pod_name\n185\t }\n186\t}\n187\t\n188\t#[cfg(test)]\n189\tmod tests {\n190\t use super::*;\n191\t\n192\t #[test]\n193\t fn test_peer_set_empty() {\n194\t let set = PeerSet::new(vec![]);\n195\t assert!(set.is_empty());\n196\t assert_eq!(set.len(), 0);\n197\t }\n198\t\n199\t #[test]\n200\t fn test_peer_set_with_peers() {\n201\t let set = PeerSet::new(vec![\"pod-1\".into(), \"pod-2\".into(), \"pod-3\".into()]);\n202\t assert!(!set.is_empty());\n203\t assert_eq!(set.len(), 3);\n204\t }\n205\t\n206\t #[test]\n207\t fn test_srv_target_pod_name_extraction() {\n208\t // Test that pod names are correctly extracted from SRV target strings.\n209\t // SRV records return targets like:\n210\t // \"miroir-miroir-0.miroir-headless.default.svc.cluster.local.\"\n211\t // We extract the first component as the pod name.\n212\t\n213\t let test_cases = vec![\n214\t (\"miroir-miroir-0.miroir-headless.default.svc.cluster.local\", Some(\"miroir-miroir-0\")),\n215\t (\"miroir-miroir-1.miroir-headless.default.svc.cluster.local.\", Some(\"miroir-miroir-1\")),\n216\t (\"miroir-miroir-2.miroir-headless.production.svc.cluster.local\", Some(\"miroir-miroir-2\")),\n217\t (\"invalid\", Some(\"invalid\")),\n218\t (\"\", None), // Empty string returns None after filter\n219\t ];\n220\t\n221\t for (target, expected) in test_cases {\n222\t let result = target.strip_suffix('.').unwrap_or(target).split('.').next().filter(|s| !s.is_empty());\n223\t assert_eq!(result, expected, \"Failed for target: {}\", target);\n224\t }\n225\t }\n226\t}\n227\t"}]},"parent_tool_use_id":null,"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","uuid":"d6870fbb-c752-434f-83f9-014419925ed4","timestamp":"2026-05-23T06:48:41.821Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/crates/miroir-core/src/peer_discovery.rs","content":"//! Peer discovery via Kubernetes headless Service SRV records (plan §14.5).\n//!\n//! This module provides zero-config peer discovery for Miroir pods in the same\n//! Deployment. Each pod periodically performs an SRV lookup against the headless\n//! Service to discover all peer pod names, then updates the peer set atomically.\n//!\n//! # Peer Identity\n//!\n//! - `PeerId = POD_NAME` (the pod name injected via Downward API)\n//! - The headless Service SRV record returns a list of `{target, port}` entries\n//! - The `target` field contains the pod DNS name (e.g., `miroir-miroir-0.miroir-headless.default.svc.cluster.local`)\n//! - We extract the pod name from the first component of the target\n//!\n//! # Usage\n//!\n//! ```no_run\n//! use miroir_core::peer_discovery::{PeerDiscovery, PeerId};\n//! use std::sync::Arc;\n//!\n//! #[tokio::main]\n//! async fn main() {\n//! let pod_name = std::env::var(\"POD_NAME\").unwrap();\n//! let namespace = std::env::var(\"POD_NAMESPACE\").unwrap();\n//! let service_name = \"miroir-headless\";\n//!\n//! let discovery = PeerDiscovery::new(\n//! pod_name,\n//! namespace,\n//! service_name.to_string(),\n//! );\n//!\n//! // Refresh peers\n//! let peers = discovery.refresh().await;\n//! println!(\"Discovered {} peers\", peers.peers.len());\n//! }\n//! ```\n\nuse crate::error::{MiroirError, Result};\nuse serde::{Deserialize, Serialize};\nuse std::sync::Arc;\nuse std::time::Instant;\nuse tokio::sync::RwLock;\n\n/// Unique identifier for a peer pod.\n///\n/// This is simply the pod name (e.g., `miroir-miroir-0`).\npub type PeerId = String;\n\n/// The current set of discovered peers with metadata.\n#[derive(Debug, Clone, Serialize, Deserialize)]\npub struct PeerSet {\n /// List of peer pod names (including self).\n pub peers: Vec,\n /// Instant when this peer set was last refreshed.\n #[serde(skip, default = \"Instant::now\")]\n pub refreshed_at: Instant,\n}\n\nimpl PeerSet {\n /// Create a new peer set.\n pub fn new(peers: Vec) -> Self {\n Self {\n peers,\n refreshed_at: Instant::now(),\n }\n }\n\n /// Count of peers in the set.\n pub fn len(&self) -> usize {\n self.peers.len()\n }\n\n /// Whether the peer set is empty.\n pub fn is_empty(&self) -> bool {\n self.peers.is_empty()\n }\n}\n\n/// Peer discovery via Kubernetes headless Service.\npub struct PeerDiscovery {\n /// Our own pod name (injected via Downward API).\n pod_name: PeerId,\n /// Kubernetes namespace (injected via Downward API).\n namespace: String,\n /// Headless Service name (e.g., \"miroir-headless\").\n service_name: String,\n /// Current peer set.\n peer_set: Arc>,\n}\n\nimpl PeerDiscovery {\n /// Create a new peer discovery instance.\n ///\n /// # Arguments\n ///\n /// * `pod_name` - Our pod name (from `POD_NAME` env var)\n /// * `namespace` - Kubernetes namespace (from `POD_NAMESPACE` env var)\n /// * `service_name` - Headless Service name (e.g., \"miroir-headless\")\n pub fn new(pod_name: String, namespace: String, service_name: String) -> Self {\n Self {\n pod_name,\n namespace,\n service_name,\n peer_set: Arc::new(RwLock::new(PeerSet::new(Vec::new()))),\n }\n }\n\n /// Get the current peer set.\n pub async fn peers(&self) -> Vec {\n self.peer_set.read().await.peers.clone()\n }\n\n /// Get the peer set count.\n pub async fn peer_count(&self) -> usize {\n self.peer_set.read().await.len()\n }\n\n /// Refresh the peer set by performing an SRV lookup (plan §14.5).\n ///\n /// This resolves `_http._tcp...svc.cluster.local`\n /// and extracts pod names from the returned targets. Uses the system\n /// DNS resolver configuration from /etc/resolv.conf for maximum\n /// compatibility across different Kubernetes distributions.\n ///\n /// Returns the updated peer set.\n #[cfg(feature = \"peer-discovery\")]\n pub async fn refresh(&self) -> Result {\n let srv_name = format!(\n \"_http._tcp.{}.{}.svc.cluster.local\",\n self.service_name, self.namespace\n );\n\n // Perform SRV lookup using blocking task\n // Use trust-dns-resolver with system configuration (reads /etc/resolv.conf)\n // This works across all Kubernetes clusters without hardcoded DNS IPs\n use trust_dns_resolver::config::{ResolverConfig, ResolverOpts};\n use trust_dns_resolver::Resolver;\n\n let lookup = tokio::task::spawn_blocking(move || {\n // Use system resolver config from /etc/resolv.conf (plan §14.5)\n let resolver = Resolver::new(ResolverConfig::default(), ResolverOpts::default())\n .map_err(|e| MiroirError::Discovery(format!(\"failed to create DNS resolver: {}\", e)))?;\n\n resolver.srv_lookup(&srv_name)\n .map_err(|e| MiroirError::Discovery(format!(\"SRV lookup failed for {}: {}\", srv_name, e)))\n })\n .await\n .map_err(|e| MiroirError::Discovery(format!(\"SRV lookup task failed: {}\", e)))??;\n\n // Extract pod names from SRV targets\n // Each SRV record has a target like \"miroir-miroir-0.miroir-headless.default.svc.cluster.local\"\n // We extract the first component as the pod name.\n let mut peers: Vec = lookup\n .iter()\n .filter_map(|srv| {\n let target = srv.target().to_string();\n // Remove trailing dot if present\n let target = target.strip_suffix('.').unwrap_or(&target);\n // Split and take first component, skip empty strings\n target.split('.').next().filter(|s| !s.is_empty()).map(|s| s.to_string())\n })\n .collect();\n\n // Sort for deterministic ordering\n peers.sort();\n\n // Update peer set\n let new_peer_set = PeerSet::new(peers);\n *self.peer_set.write().await = new_peer_set.clone();\n\n Ok(new_peer_set)\n }\n\n /// Refresh the peer set (fallback when peer-discovery feature is disabled).\n #[cfg(not(feature = \"peer-discovery\"))]\n pub async fn refresh(&self) -> Result {\n Err(MiroirError::Discovery(\n \"peer-discovery feature is disabled\".to_string(),\n ))\n }\n\n /// Get our own pod name.\n pub fn pod_name(&self) -> &str {\n &self.pod_name\n }\n}\n\n#[cfg(test)]\nmod tests {\n use super::*;\n\n #[test]\n fn test_peer_set_empty() {\n let set = PeerSet::new(vec![]);\n assert!(set.is_empty());\n assert_eq!(set.len(), 0);\n }\n\n #[test]\n fn test_peer_set_with_peers() {\n let set = PeerSet::new(vec![\"pod-1\".into(), \"pod-2\".into(), \"pod-3\".into()]);\n assert!(!set.is_empty());\n assert_eq!(set.len(), 3);\n }\n\n #[test]\n fn test_srv_target_pod_name_extraction() {\n // Test that pod names are correctly extracted from SRV target strings.\n // SRV records return targets like:\n // \"miroir-miroir-0.miroir-headless.default.svc.cluster.local.\"\n // We extract the first component as the pod name.\n\n let test_cases = vec![\n (\"miroir-miroir-0.miroir-headless.default.svc.cluster.local\", Some(\"miroir-miroir-0\")),\n (\"miroir-miroir-1.miroir-headless.default.svc.cluster.local.\", Some(\"miroir-miroir-1\")),\n (\"miroir-miroir-2.miroir-headless.production.svc.cluster.local\", Some(\"miroir-miroir-2\")),\n (\"invalid\", Some(\"invalid\")),\n (\"\", None), // Empty string returns None after filter\n ];\n\n for (target, expected) in test_cases {\n let result = target.strip_suffix('.').unwrap_or(target).split('.').next().filter(|s| !s.is_empty());\n assert_eq!(result, expected, \"Failed for target: {}\", target);\n }\n }\n}\n","numLines":227,"startLine":1,"totalLines":227}}} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_e580809ad7e4408e9b19ec43","type":"tool_result","content":"1\t//! Miroir configuration — plan §4 YAML schema with §13 advanced capabilities.\n2\t\n3\tpub mod advanced;\n4\tmod error;\n5\tmod load;\n6\tmod validate;\n7\t\n8\tpub use error::ConfigError;\n9\tpub use advanced::{SearchUiConfig, CspOverridesConfig};\n10\t\n11\tuse serde::{Deserialize, Serialize};\n12\t\n13\t/// Top-level configuration matching plan §4 YAML schema under `miroir:`.\n14\t///\n15\t/// # Drift Guard (§14.8)\n16\t///\n17\t/// The default values for resource-sensitive knobs are sized for the\n18\t/// 2 vCPU / 3.75 GB envelope. This doc-test ensures the Rust defaults\n19\t/// match the §14.8 reference fixture:\n20\t///\n21\t/// ```\n22\t/// use miroir_core::config::MiroirConfig;\n23\t/// let cfg = MiroirConfig::default();\n24\t/// assert_eq!(cfg.server.max_body_bytes, 104_857_600);\n25\t/// assert_eq!(cfg.server.max_concurrent_requests, 500);\n26\t/// assert_eq!(cfg.server.request_timeout_ms, 30_000);\n27\t/// assert_eq!(cfg.connection_pool_per_node.max_idle, 32);\n28\t/// assert_eq!(cfg.connection_pool_per_node.max_total, 128);\n29\t/// assert_eq!(cfg.connection_pool_per_node.idle_timeout_s, 60);\n30\t/// assert_eq!(cfg.task_registry.cache_size, 10_000);\n31\t/// assert_eq!(cfg.task_registry.redis_pool_max, 50);\n32\t/// assert_eq!(cfg.idempotency.max_cached_keys, 1_000_000);\n33\t/// assert_eq!(cfg.idempotency.ttl_seconds, 86_400);\n34\t/// assert_eq!(cfg.session_pinning.max_sessions, 100_000);\n35\t/// assert_eq!(cfg.query_coalescing.max_subscribers, 1_000);\n36\t/// assert_eq!(cfg.query_coalescing.max_pending_queries, 10_000);\n37\t/// assert_eq!(cfg.anti_entropy.max_read_concurrency, 2);\n38\t/// assert_eq!(cfg.anti_entropy.fingerprint_batch_size, 1_000);\n39\t/// assert_eq!(cfg.resharding.backfill_concurrency, 4);\n40\t/// assert_eq!(cfg.resharding.backfill_batch_size, 1_000);\n41\t/// assert_eq!(cfg.peer_discovery.service_name, \"miroir-headless\");\n42\t/// assert_eq!(cfg.peer_discovery.refresh_interval_s, 15);\n43\t/// assert_eq!(cfg.leader_election.lease_ttl_s, 10);\n44\t/// assert_eq!(cfg.leader_election.renew_interval_s, 3);\n45\t/// ```\n46\t#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]\n47\t#[serde(default)]\n48\tpub struct MiroirConfig {\n49\t // --- Secrets (env-var overrides) ---\n50\t /// Client-facing API key. Env override: `MIROIR_MASTER_KEY`.\n51\t pub master_key: String,\n52\t /// Key Miroir uses on Meilisearch nodes. Env override: `MIROIR_NODE_MASTER_KEY`.\n53\t pub node_master_key: String,\n54\t\n55\t // --- Core topology ---\n56\t /// Total number of logical shards.\n57\t pub shards: u32,\n58\t /// Replication factor (intra-group replicas per shard). Production: 2.\n59\t pub replication_factor: u32,\n60\t /// Number of independent query pools. Default 1; production: 2.\n61\t pub replica_groups: u32,\n62\t\n63\t // --- Sub-structs ---\n64\t pub nodes: Vec,\n65\t pub task_store: TaskStoreConfig,\n66\t pub admin: AdminConfig,\n67\t pub health: HealthConfig,\n68\t pub scatter: ScatterConfig,\n69\t pub rebalancer: RebalancerConfig,\n70\t pub server: ServerConfig,\n71\t pub connection_pool_per_node: ConnectionPoolConfig,\n72\t pub task_registry: TaskRegistryConfig,\n73\t\n74\t // --- §13 advanced capabilities ---\n75\t pub resharding: advanced::ReshardingConfig,\n76\t pub hedging: advanced::HedgingConfig,\n77\t pub replica_selection: advanced::ReplicaSelectionConfig,\n78\t pub query_planner: advanced::QueryPlannerConfig,\n79\t pub settings_broadcast: advanced::SettingsBroadcastConfig,\n80\t pub settings_drift_check: advanced::SettingsDriftCheckConfig,\n81\t pub session_pinning: advanced::SessionPinningConfig,\n82\t pub aliases: advanced::AliasesConfig,\n83\t pub anti_entropy: advanced::AntiEntropyConfig,\n84\t pub dump_import: advanced::DumpImportConfig,\n85\t pub idempotency: advanced::IdempotencyConfig,\n86\t pub query_coalescing: advanced::QueryCoalescingConfig,\n87\t pub multi_search: advanced::MultiSearchConfig,\n88\t pub vector_search: advanced::VectorSearchConfig,\n89\t pub cdc: advanced::CdcConfig,\n90\t pub ttl: advanced::TtlConfig,\n91\t pub tenant_affinity: advanced::TenantAffinityConfig,\n92\t pub shadow: advanced::ShadowConfig,\n93\t pub ilm: advanced::IlmConfig,\n94\t pub canary_runner: advanced::CanaryRunnerConfig,\n95\t pub explain: advanced::ExplainConfig,\n96\t pub admin_ui: advanced::AdminUiConfig,\n97\t pub search_ui: advanced::SearchUiConfig,\n98\t pub tracing: advanced::TracingConfig,\n99\t\n100\t // --- §14 horizontal scaling ---\n101\t pub peer_discovery: PeerDiscoveryConfig,\n102\t pub leader_election: LeaderElectionConfig,\n103\t pub hpa: HpaConfig,\n104\t}\n105\t\n106\t/// Convenience alias.\n107\tpub type Config = MiroirConfig;\n108\t\n109\timpl Default for MiroirConfig {\n110\t fn default() -> Self {\n111\t Self {\n112\t master_key: String::new(),\n113\t node_master_key: String::new(),\n114\t shards: 64,\n115\t replication_factor: 2,\n116\t replica_groups: 1,\n117\t nodes: Vec::new(),\n118\t task_store: TaskStoreConfig::default(),\n119\t admin: AdminConfig::default(),\n120\t health: HealthConfig::default(),\n121\t scatter: ScatterConfig::default(),\n122\t rebalancer: RebalancerConfig::default(),\n123\t server: ServerConfig::default(),\n124\t connection_pool_per_node: ConnectionPoolConfig::default(),\n125\t task_registry: TaskRegistryConfig::default(),\n126\t resharding: advanced::ReshardingConfig::default(),\n127\t hedging: advanced::HedgingConfig::default(),\n128\t replica_selection: advanced::ReplicaSelectionConfig::default(),\n129\t query_planner: advanced::QueryPlannerConfig::default(),\n130\t settings_broadcast: advanced::SettingsBroadcastConfig::default(),\n131\t settings_drift_check: advanced::SettingsDriftCheckConfig::default(),\n132\t session_pinning: advanced::SessionPinningConfig::default(),\n133\t aliases: advanced::AliasesConfig::default(),\n134\t anti_entropy: advanced::AntiEntropyConfig::default(),\n135\t dump_import: advanced::DumpImportConfig::default(),\n136\t idempotency: advanced::IdempotencyConfig::default(),\n137\t query_coalescing: advanced::QueryCoalescingConfig::default(),\n138\t multi_search: advanced::MultiSearchConfig::default(),\n139\t vector_search: advanced::VectorSearchConfig::default(),\n140\t cdc: advanced::CdcConfig::default(),\n141\t ttl: advanced::TtlConfig::default(),\n142\t tenant_affinity: advanced::TenantAffinityConfig::default(),\n143\t shadow: advanced::ShadowConfig::default(),\n144\t ilm: advanced::IlmConfig::default(),\n145\t canary_runner: advanced::CanaryRunnerConfig::default(),\n146\t explain: advanced::ExplainConfig::default(),\n147\t admin_ui: advanced::AdminUiConfig::default(),\n148\t search_ui: advanced::SearchUiConfig::default(),\n149\t tracing: advanced::TracingConfig::default(),\n150\t peer_discovery: PeerDiscoveryConfig::default(),\n151\t leader_election: LeaderElectionConfig::default(),\n152\t hpa: HpaConfig::default(),\n153\t }\n154\t }\n155\t}\n156\t\n157\timpl MiroirConfig {\n158\t /// Validate cross-field constraints. Returns `Ok(())` or a `ConfigError`.\n159\t pub fn validate(&self) -> Result<(), ConfigError> {\n160\t validate::validate(self)\n161\t }\n162\t\n163\t /// Layered loading: file → env overrides → CLI overrides.\n164\t pub fn load() -> Result {\n165\t load::load()\n166\t }\n167\t\n168\t /// Load from a specific file path with env-var overrides applied.\n169\t pub fn load_from(path: &std::path::Path) -> Result {\n170\t load::load_from(path)\n171\t }\n172\t\n173\t /// Load from a YAML string (useful for testing).\n174\t pub fn from_yaml(yaml: &str) -> Result {\n175\t load::from_yaml(yaml)\n176\t }\n177\t}\n178\t\n179\t// ---------------------------------------------------------------------------\n180\t// Core sub-structs (§4)\n181\t// ---------------------------------------------------------------------------\n182\t\n183\t/// A single Meilisearch node in the cluster topology.\n184\t#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]\n185\tpub struct NodeConfig {\n186\t pub id: String,\n187\t pub address: String,\n188\t pub replica_group: u32,\n189\t}\n190\t\n191\t/// Task store backend configuration.\n192\t#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]\n193\t#[serde(default)]\n194\tpub struct TaskStoreConfig {\n195\t /// `sqlite` or `redis`.\n196\t pub backend: String,\n197\t /// Path to SQLite database file (sqlite backend).\n198\t pub path: String,\n199\t /// Redis URL (redis backend), e.g. `redis://host:6379`.\n200\t pub url: String,\n201\t}\n202\t\n203\timpl Default for TaskStoreConfig {\n204\t fn default() -> Self {\n205\t Self {\n206\t backend: \"sqlite\".into(),\n207\t path: \"/data/miroir-tasks.db\".into(),\n208\t url: String::new(),\n209\t }\n210\t }\n211\t}\n212\t\n213\t/// Admin API configuration.\n214\t#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]\n215\t#[serde(default)]\n216\tpub struct AdminConfig {\n217\t pub enabled: bool,\n218\t /// Env override: `MIROIR_ADMIN_API_KEY`.\n219\t pub api_key: String,\n220\t}\n221\t\n222\timpl Default for AdminConfig {\n223\t fn default() -> Self {\n224\t Self {\n225\t enabled: true,\n226\t api_key: String::new(),\n227\t }\n228\t }\n229\t}\n230\t\n231\t/// Health check configuration.\n232\t#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]\n233\t#[serde(default)]\n234\tpub struct HealthConfig {\n235\t pub interval_ms: u64,\n236\t pub timeout_ms: u64,\n237\t pub unhealthy_threshold: u32,\n238\t pub recovery_threshold: u32,\n239\t}\n240\t\n241\timpl Default for HealthConfig {\n242\t fn default() -> Self {\n243\t Self {\n244\t interval_ms: 5000,\n245\t timeout_ms: 2000,\n246\t unhealthy_threshold: 3,\n247\t recovery_threshold: 2,\n248\t }\n249\t }\n250\t}\n251\t\n252\t/// Scatter-gather query configuration.\n253\t#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]\n254\t#[serde(default)]\n255\tpub struct ScatterConfig {\n256\t pub node_timeout_ms: u64,\n257\t pub retry_on_timeout: bool,\n258\t /// `partial` or `error`.\n259\t pub unavailable_shard_policy: String,\n260\t}\n261\t\n262\timpl Default for ScatterConfig {\n263\t fn default() -> Self {\n264\t Self {\n265\t node_timeout_ms: 5000,\n266\t retry_on_timeout: true,\n267\t unavailable_shard_policy: \"partial\".into(),\n268\t }\n269\t }\n270\t}\n271\t\n272\t/// Rebalancer configuration.\n273\t#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]\n274\t#[serde(default)]\n275\tpub struct RebalancerConfig {\n276\t pub auto_rebalance_on_recovery: bool,\n277\t pub max_concurrent_migrations: u32,\n278\t pub migration_timeout_s: u64,\n279\t}\n280\t\n281\timpl Default for RebalancerConfig {\n282\t fn default() -> Self {\n283\t Self {\n284\t auto_rebalance_on_recovery: true,\n285\t max_concurrent_migrations: 4,\n286\t migration_timeout_s: 3600,\n287\t }\n288\t }\n289\t}\n290\t\n291\t/// Server (HTTP listener) configuration.\n292\t#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]\n293\t#[serde(default)]\n294\tpub struct ServerConfig {\n295\t pub port: u16,\n296\t pub bind: String,\n297\t pub max_body_bytes: u64,\n298\t #[serde(default = \"default_max_concurrent_requests\")]\n299\t pub max_concurrent_requests: u32,\n300\t #[serde(default = \"default_request_timeout_ms\")]\n301\t pub request_timeout_ms: u64,\n302\t}\n303\t\n304\tfn default_max_concurrent_requests() -> u32 {\n305\t 500\n306\t}\n307\tfn default_request_timeout_ms() -> u64 {\n308\t 30000\n309\t}\n310\t\n311\timpl Default for ServerConfig {\n312\t fn default() -> Self {\n313\t Self {\n314\t port: 7700,\n315\t bind: \"0.0.0.0\".into(),\n316\t max_body_bytes: 104_857_600, // 100 MiB\n317\t max_concurrent_requests: default_max_concurrent_requests(),\n318\t request_timeout_ms: default_request_timeout_ms(),\n319\t }\n320\t }\n321\t}\n322\t\n323\t/// HTTP/2 connection pool per-node settings (§14.8).\n324\t#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]\n325\t#[serde(default)]\n326\tpub struct ConnectionPoolConfig {\n327\t pub max_idle: u32,\n328\t pub max_total: u32,\n329\t pub idle_timeout_s: u64,\n330\t}\n331\t\n332\timpl Default for ConnectionPoolConfig {\n333\t fn default() -> Self {\n334\t Self {\n335\t max_idle: 32,\n336\t max_total: 128,\n337\t idle_timeout_s: 60,\n338\t }\n339\t }\n340\t}\n341\t\n342\t/// Task registry cache settings (§14.8) and TTL pruner config (plan §4).\n343\t#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]\n344\t#[serde(default)]\n345\tpub struct TaskRegistryConfig {\n346\t pub cache_size: u32,\n347\t pub redis_pool_max: u32,\n348\t /// TTL for completed tasks in seconds. Tasks older than this are pruned.\n349\t pub ttl_seconds: u64,\n350\t /// How often the pruner runs, in seconds.\n351\t pub prune_interval_s: u64,\n352\t /// Maximum rows deleted per pruner iteration.\n353\t pub prune_batch_size: u32,\n354\t}\n355\t\n356\timpl Default for TaskRegistryConfig {\n357\t fn default() -> Self {\n358\t Self {\n359\t cache_size: 10000,\n360\t redis_pool_max: 50,\n361\t ttl_seconds: 7 * 24 * 3600, // 7 days\n362\t prune_interval_s: 300, // 5 min\n363\t prune_batch_size: 10000,\n364\t }\n365\t }\n366\t}\n367\t\n368\t/// Peer discovery via Kubernetes headless Service (§14.5).\n369\t#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]\n370\t#[serde(default)]\n371\tpub struct PeerDiscoveryConfig {\n372\t pub service_name: String,\n373\t pub refresh_interval_s: u64,\n374\t}\n375\t\n376\timpl Default for PeerDiscoveryConfig {\n377\t fn default() -> Self {\n378\t Self {\n379\t service_name: \"miroir-headless\".into(),\n380\t refresh_interval_s: 15,\n381\t }\n382\t }\n383\t}\n384\t\n385\t/// Leader election for Mode B background jobs (§14.5).\n386\t#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]\n387\t#[serde(default)]\n388\tpub struct LeaderElectionConfig {\n389\t pub enabled: bool,\n390\t pub lease_ttl_s: u64,\n391\t pub renew_interval_s: u64,\n392\t}\n393\t\n394\timpl Default for LeaderElectionConfig {\n395\t fn default() -> Self {\n396\t Self {\n397\t enabled: true,\n398\t lease_ttl_s: 10,\n399\t renew_interval_s: 3,\n400\t }\n401\t }\n402\t}\n403\t\n404\t/// Horizontal Pod Autoscaler settings (Helm-only, informational in config).\n405\t#[derive(Debug, Clone, PartialEq, Serialize, Deserialize, Default)]\n406\t#[serde(default)]\n407\tpub struct HpaConfig {\n408\t #[serde(default)]\n409\t pub enabled: bool,\n410\t}\n411\t\n412\t/// Policy for handling unavailable shards during scatter.\n413\t#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]\n414\t#[serde(rename_all = \"snake_case\")]\n415\tpub enum UnavailableShardPolicy {\n416\t /// Return partial results from available nodes.\n417\t Partial,\n418\t /// Fail the request if any shard is unavailable.\n419\t Error,\n420\t /// Fall back to another replica group for unavailable shards.\n421\t Fallback,\n422\t}\n423\t\n424\timpl Default for UnavailableShardPolicy {\n425\t fn default() -> Self {\n426\t Self::Partial\n427\t }\n428\t}\n429\t\n430\timpl std::fmt::Display for UnavailableShardPolicy {\n431\t fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {\n432\t match self {\n433\t Self::Partial => write!(f, \"partial\"),\n434\t Self::Error => write!(f, \"error\"),\n435\t Self::Fallback => write!(f, \"fallback\"),\n436\t }\n437\t }\n438\t}\n439\t\n440\t#[cfg(test)]\n441\tmod tests {\n442\t use super::*;\n443\t\n444\t /// Returns a minimal valid dev config (single-node, sqlite, RF=1).\n445\t fn dev_config() -> MiroirConfig {\n446\t MiroirConfig {\n447\t replication_factor: 1,\n448\t task_store: TaskStoreConfig {\n449\t backend: \"sqlite\".into(),\n450\t ..Default::default()\n451\t },\n452\t cdc: advanced::CdcConfig {\n453\t buffer: advanced::CdcBufferConfig {\n454\t overflow: \"drop\".into(),\n455\t ..Default::default()\n456\t },\n457\t ..Default::default()\n458\t },\n459\t search_ui: advanced::SearchUiConfig {\n460\t rate_limit: advanced::SearchUiRateLimitConfig {\n461\t backend: \"local\".into(),\n462\t ..Default::default()\n463\t },\n464\t ..Default::default()\n465\t },\n466\t ..Default::default()\n467\t }\n468\t }\n469\t\n470\t #[test]\n471\t fn default_config_is_valid() {\n472\t let cfg = MiroirConfig::default();\n473\t // Default has replication_factor=2 with sqlite, which should fail\n474\t // validation — but the struct itself should construct fine.\n475\t assert_eq!(cfg.shards, 64);\n476\t assert_eq!(cfg.replication_factor, 2);\n477\t assert_eq!(cfg.replica_groups, 1);\n478\t assert_eq!(cfg.task_store.backend, \"sqlite\");\n479\t }\n480\t\n481\t #[test]\n482\t fn minimal_yaml_deserializes() {\n483\t let yaml = r#\"\n484\tshards: 32\n485\treplication_factor: 1\n486\tnodes: []\n487\t\"#;\n488\t let cfg: MiroirConfig = serde_yaml::from_str(yaml).expect(\"deserialize\");\n489\t assert_eq!(cfg.shards, 32);\n490\t assert_eq!(cfg.replication_factor, 1);\n491\t // All §13 blocks should get defaults\n492\t assert!(cfg.resharding.enabled);\n493\t assert!(cfg.hedging.enabled);\n494\t assert!(cfg.anti_entropy.enabled);\n495\t }\n496\t\n497\t #[test]\n498\t fn full_plan_example_deserializes() {\n499\t let yaml = r#\"\n500\tmaster_key: \"test-key\"\n501\tnode_master_key: \"node-key\"\n502\tshards: 64\n503\treplication_factor: 2\n504\treplica_groups: 2\n505\ttask_store:\n506\t backend: redis\n507\t url: \"redis://redis:6379\"\n508\tadmin:\n509\t enabled: true\n510\tnodes:\n511\t - id: \"meili-0\"\n512\t address: \"http://meili-0.search.svc:7700\"\n513\t replica_group: 0\n514\t - id: \"meili-1\"\n515\t address: \"http://meili-1.search.svc:7700\"\n516\t replica_group: 0\n517\thealth:\n518\t interval_ms: 5000\n519\t timeout_ms: 2000\n520\t unhealthy_threshold: 3\n521\t recovery_threshold: 2\n522\tscatter:\n523\t node_timeout_ms: 5000\n524\t retry_on_timeout: true\n525\t unavailable_shard_policy: partial\n526\trebalancer:\n527\t auto_rebalance_on_recovery: true\n528\t max_concurrent_migrations: 4\n529\t migration_timeout_s: 3600\n530\tserver:\n531\t port: 7700\n532\t bind: \"0.0.0.0\"\n533\t max_body_bytes: 104857600\n534\tleader_election:\n535\t enabled: true\n536\t\"#;\n537\t let cfg: MiroirConfig = serde_yaml::from_str(yaml).expect(\"deserialize\");\n538\t assert_eq!(cfg.master_key, \"test-key\");\n539\t assert_eq!(cfg.nodes.len(), 2);\n540\t assert_eq!(cfg.replica_groups, 2);\n541\t cfg.validate().expect(\"valid production config\");\n542\t }\n543\t\n544\t #[test]\n545\t fn round_trip_yaml() {\n546\t let original = MiroirConfig::default();\n547\t let yaml = serde_yaml::to_string(&original).expect(\"serialize\");\n548\t let round_tripped: MiroirConfig = serde_yaml::from_str(&yaml).expect(\"deserialize\");\n549\t assert_eq!(original, round_tripped);\n550\t }\n551\t\n552\t #[test]\n553\t fn validation_rejects_ha_with_sqlite() {\n554\t let mut cfg = dev_config();\n555\t cfg.replication_factor = 2;\n556\t let err = cfg.validate().unwrap_err();\n557\t assert!(err.to_string().contains(\"redis\"));\n558\t }\n559\t\n560\t #[test]\n561\t fn validation_rejects_zero_shards() {\n562\t let mut cfg = dev_config();\n563\t cfg.shards = 0;\n564\t let err = cfg.validate().unwrap_err();\n565\t assert!(err.to_string().contains(\"shards\"));\n566\t }\n567\t\n568\t #[test]\n569\t fn validation_rejects_duplicate_node_ids() {\n570\t let mut cfg = dev_config();\n571\t cfg.nodes = vec![\n572\t NodeConfig {\n573\t id: \"n0\".into(),\n574\t address: \"http://n0\".into(),\n575\t replica_group: 0,\n576\t },\n577\t NodeConfig {\n578\t id: \"n0\".into(),\n579\t address: \"http://n0b\".into(),\n580\t replica_group: 0,\n581\t },\n582\t ];\n583\t let err = cfg.validate().unwrap_err();\n584\t assert!(err.to_string().contains(\"duplicate\"));\n585\t }\n586\t\n587\t #[test]\n588\t fn validation_rejects_node_outside_replica_groups() {\n589\t let mut cfg = dev_config();\n590\t cfg.nodes = vec![NodeConfig {\n591\t id: \"n0\".into(),\n592\t address: \"http://n0\".into(),\n593\t replica_group: 5,\n594\t }];\n595\t let err = cfg.validate().unwrap_err();\n596\t assert!(err.to_string().contains(\"replica_group\"));\n597\t }\n598\t\n599\t #[test]\n600\t fn validation_rejects_scoped_key_timing_inversion() {\n601\t let mut cfg = dev_config();\n602\t cfg.search_ui.scoped_key_max_age_days = 10;\n603\t cfg.search_ui.scoped_key_rotate_before_expiry_days = 10;\n604\t let err = cfg.validate().unwrap_err();\n605\t assert!(err.to_string().contains(\"scoped_key\"));\n606\t }\n607\t\n608\t #[test]\n609\t fn advanced_defaults_all_enabled() {\n610\t let cfg = MiroirConfig::default();\n611\t assert!(cfg.resharding.enabled);\n612\t assert!(cfg.hedging.enabled);\n613\t assert!(cfg.replica_selection.strategy == \"adaptive\");\n614\t assert!(cfg.query_planner.enabled);\n615\t assert!(cfg.settings_broadcast.strategy == \"two_phase\");\n616\t assert!(cfg.session_pinning.enabled);\n617\t assert!(cfg.aliases.enabled);\n618\t assert!(cfg.anti_entropy.enabled);\n619\t assert!(cfg.dump_import.mode == \"streaming\");\n620\t assert!(cfg.idempotency.enabled);\n621\t assert!(cfg.query_coalescing.enabled);\n622\t assert!(cfg.multi_search.enabled);\n623\t assert!(cfg.vector_search.enabled);\n624\t assert!(cfg.cdc.enabled);\n625\t assert!(cfg.ttl.enabled);\n626\t assert!(cfg.tenant_affinity.enabled);\n627\t assert!(cfg.shadow.enabled);\n628\t assert!(cfg.ilm.enabled);\n629\t assert!(cfg.canary_runner.enabled);\n630\t assert!(cfg.explain.enabled);\n631\t assert!(cfg.admin_ui.enabled);\n632\t assert!(cfg.search_ui.enabled);\n633\t }\n634\t\n635\t #[test]\n636\t fn config_from_yaml_valid() {\n637\t let yaml = r#\"\n638\tshards: 32\n639\treplication_factor: 1\n640\tnodes: []\n641\ttask_store:\n642\t backend: redis\n643\t\"#;\n644\t let cfg = MiroirConfig::from_yaml(yaml).unwrap();\n645\t assert_eq!(cfg.shards, 32);\n646\t }\n647\t\n648\t #[test]\n649\t fn unavailable_shard_policy_default_and_display() {\n650\t let policy: UnavailableShardPolicy = Default::default();\n651\t assert!(matches!(policy, UnavailableShardPolicy::Partial));\n652\t assert_eq!(format!(\"{}\", policy), \"partial\");\n653\t assert_eq!(format!(\"{}\", UnavailableShardPolicy::Error), \"error\");\n654\t assert_eq!(format!(\"{}\", UnavailableShardPolicy::Fallback), \"fallback\");\n655\t }\n656\t\n657\t #[test]\n658\t fn load_from_file_reads_yaml() {\n659\t let yaml = r#\"\n660\tshards: 16\n661\treplication_factor: 1\n662\tnodes: []\n663\ttask_store:\n664\t backend: redis\n665\t\"#;\n666\t let dir = tempfile::tempdir().unwrap();\n667\t let path = dir.path().join(\"miroir.yaml\");\n668\t std::fs::write(&path, yaml).unwrap();\n669\t let cfg = MiroirConfig::load_from(&path).unwrap();\n670\t assert_eq!(cfg.shards, 16);\n671\t }\n672\t\n673\t #[test]\n674\t fn load_from_missing_file_fails() {\n675\t let cfg = MiroirConfig::load_from(std::path::Path::new(\"/nonexistent/miroir.yaml\"));\n676\t assert!(cfg.is_err());\n677\t }\n678\t\n679\t /// Drift guard: ensure Config::default() matches §14.8 reference defaults.\n680\t ///\n681\t /// This test serializes the default config and compares key §14.8 knobs\n682\t /// against the reference fixture. If this fails, either the Rust defaults\n683\t /// have drifted from §14.8, or the plan needs updating.\n684\t #[test]\n685\t fn section_14_8_defaults_match() {\n686\t let cfg = MiroirConfig::default();\n687\t\n688\t // §14.8 server defaults\n689\t assert_eq!(cfg.server.max_body_bytes, 104_857_600, \"server.max_body_bytes\");\n690\t assert_eq!(cfg.server.max_concurrent_requests, 500, \"server.max_concurrent_requests\");\n691\t assert_eq!(cfg.server.request_timeout_ms, 30_000, \"server.request_timeout_ms\");\n692\t\n693\t // §14.8 connection_pool_per_node defaults\n694\t assert_eq!(cfg.connection_pool_per_node.max_idle, 32, \"connection_pool_per_node.max_idle\");\n695\t assert_eq!(cfg.connection_pool_per_node.max_total, 128, \"connection_pool_per_node.max_total\");\n696\t assert_eq!(cfg.connection_pool_per_node.idle_timeout_s, 60, \"connection_pool_per_node.idle_timeout_s\");\n697\t\n698\t // §14.8 task_registry defaults\n699\t assert_eq!(cfg.task_registry.cache_size, 10_000, \"task_registry.cache_size\");\n700\t assert_eq!(cfg.task_registry.redis_pool_max, 50, \"task_registry.redis_pool_max\");\n701\t\n702\t // §14.8 idempotency defaults\n703\t assert_eq!(cfg.idempotency.max_cached_keys, 1_000_000, \"idempotency.max_cached_keys\");\n704\t assert_eq!(cfg.idempotency.ttl_seconds, 86_400, \"idempotency.ttl_seconds\");\n705\t\n706\t // §14.8 session_pinning defaults\n707\t assert_eq!(cfg.session_pinning.max_sessions, 100_000, \"session_pinning.max_sessions\");\n708\t\n709\t // §14.8 query_coalescing defaults\n710\t assert_eq!(cfg.query_coalescing.max_subscribers, 1_000, \"query_coalescing.max_subscribers\");\n711\t assert_eq!(cfg.query_coalescing.max_pending_queries, 10_000, \"query_coalescing.max_pending_queries\");\n712\t\n713\t // §14.8 anti_entropy defaults\n714\t assert_eq!(cfg.anti_entropy.max_read_concurrency, 2, \"anti_entropy.max_read_concurrency\");\n715\t assert_eq!(cfg.anti_entropy.fingerprint_batch_size, 1_000, \"anti_entropy.fingerprint_batch_size\");\n716\t\n717\t // §14.8 resharding defaults\n718\t assert_eq!(cfg.resharding.backfill_concurrency, 4, \"resharding.backfill_concurrency\");\n719\t assert_eq!(cfg.resharding.backfill_batch_size, 1_000, \"resharding.backfill_batch_size\");\n720\t\n721\t // §14.8 peer_discovery defaults\n722\t assert_eq!(cfg.peer_discovery.service_name, \"miroir-headless\", \"peer_discovery.service_name\");\n723\t assert_eq!(cfg.peer_discovery.refresh_interval_s, 15, \"peer_discovery.refresh_interval_s\");\n724\t\n725\t // §14.8 leader_election defaults\n726\t assert_eq!(cfg.leader_election.lease_ttl_s, 10, \"leader_election.lease_ttl_s\");\n727\t assert_eq!(cfg.leader_election.renew_interval_s, 3, \"leader_election.renew_interval_s\");\n728\t }\n729\t}\n730\t"}]},"parent_tool_use_id":null,"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","uuid":"5ecdd92d-0bd1-475e-8059-345975523787","timestamp":"2026-05-23T06:48:41.824Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/crates/miroir-core/src/config.rs","content":"//! Miroir configuration — plan §4 YAML schema with §13 advanced capabilities.\n\npub mod advanced;\nmod error;\nmod load;\nmod validate;\n\npub use error::ConfigError;\npub use advanced::{SearchUiConfig, CspOverridesConfig};\n\nuse serde::{Deserialize, Serialize};\n\n/// Top-level configuration matching plan §4 YAML schema under `miroir:`.\n///\n/// # Drift Guard (§14.8)\n///\n/// The default values for resource-sensitive knobs are sized for the\n/// 2 vCPU / 3.75 GB envelope. This doc-test ensures the Rust defaults\n/// match the §14.8 reference fixture:\n///\n/// ```\n/// use miroir_core::config::MiroirConfig;\n/// let cfg = MiroirConfig::default();\n/// assert_eq!(cfg.server.max_body_bytes, 104_857_600);\n/// assert_eq!(cfg.server.max_concurrent_requests, 500);\n/// assert_eq!(cfg.server.request_timeout_ms, 30_000);\n/// assert_eq!(cfg.connection_pool_per_node.max_idle, 32);\n/// assert_eq!(cfg.connection_pool_per_node.max_total, 128);\n/// assert_eq!(cfg.connection_pool_per_node.idle_timeout_s, 60);\n/// assert_eq!(cfg.task_registry.cache_size, 10_000);\n/// assert_eq!(cfg.task_registry.redis_pool_max, 50);\n/// assert_eq!(cfg.idempotency.max_cached_keys, 1_000_000);\n/// assert_eq!(cfg.idempotency.ttl_seconds, 86_400);\n/// assert_eq!(cfg.session_pinning.max_sessions, 100_000);\n/// assert_eq!(cfg.query_coalescing.max_subscribers, 1_000);\n/// assert_eq!(cfg.query_coalescing.max_pending_queries, 10_000);\n/// assert_eq!(cfg.anti_entropy.max_read_concurrency, 2);\n/// assert_eq!(cfg.anti_entropy.fingerprint_batch_size, 1_000);\n/// assert_eq!(cfg.resharding.backfill_concurrency, 4);\n/// assert_eq!(cfg.resharding.backfill_batch_size, 1_000);\n/// assert_eq!(cfg.peer_discovery.service_name, \"miroir-headless\");\n/// assert_eq!(cfg.peer_discovery.refresh_interval_s, 15);\n/// assert_eq!(cfg.leader_election.lease_ttl_s, 10);\n/// assert_eq!(cfg.leader_election.renew_interval_s, 3);\n/// ```\n#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]\n#[serde(default)]\npub struct MiroirConfig {\n // --- Secrets (env-var overrides) ---\n /// Client-facing API key. Env override: `MIROIR_MASTER_KEY`.\n pub master_key: String,\n /// Key Miroir uses on Meilisearch nodes. Env override: `MIROIR_NODE_MASTER_KEY`.\n pub node_master_key: String,\n\n // --- Core topology ---\n /// Total number of logical shards.\n pub shards: u32,\n /// Replication factor (intra-group replicas per shard). Production: 2.\n pub replication_factor: u32,\n /// Number of independent query pools. Default 1; production: 2.\n pub replica_groups: u32,\n\n // --- Sub-structs ---\n pub nodes: Vec,\n pub task_store: TaskStoreConfig,\n pub admin: AdminConfig,\n pub health: HealthConfig,\n pub scatter: ScatterConfig,\n pub rebalancer: RebalancerConfig,\n pub server: ServerConfig,\n pub connection_pool_per_node: ConnectionPoolConfig,\n pub task_registry: TaskRegistryConfig,\n\n // --- §13 advanced capabilities ---\n pub resharding: advanced::ReshardingConfig,\n pub hedging: advanced::HedgingConfig,\n pub replica_selection: advanced::ReplicaSelectionConfig,\n pub query_planner: advanced::QueryPlannerConfig,\n pub settings_broadcast: advanced::SettingsBroadcastConfig,\n pub settings_drift_check: advanced::SettingsDriftCheckConfig,\n pub session_pinning: advanced::SessionPinningConfig,\n pub aliases: advanced::AliasesConfig,\n pub anti_entropy: advanced::AntiEntropyConfig,\n pub dump_import: advanced::DumpImportConfig,\n pub idempotency: advanced::IdempotencyConfig,\n pub query_coalescing: advanced::QueryCoalescingConfig,\n pub multi_search: advanced::MultiSearchConfig,\n pub vector_search: advanced::VectorSearchConfig,\n pub cdc: advanced::CdcConfig,\n pub ttl: advanced::TtlConfig,\n pub tenant_affinity: advanced::TenantAffinityConfig,\n pub shadow: advanced::ShadowConfig,\n pub ilm: advanced::IlmConfig,\n pub canary_runner: advanced::CanaryRunnerConfig,\n pub explain: advanced::ExplainConfig,\n pub admin_ui: advanced::AdminUiConfig,\n pub search_ui: advanced::SearchUiConfig,\n pub tracing: advanced::TracingConfig,\n\n // --- §14 horizontal scaling ---\n pub peer_discovery: PeerDiscoveryConfig,\n pub leader_election: LeaderElectionConfig,\n pub hpa: HpaConfig,\n}\n\n/// Convenience alias.\npub type Config = MiroirConfig;\n\nimpl Default for MiroirConfig {\n fn default() -> Self {\n Self {\n master_key: String::new(),\n node_master_key: String::new(),\n shards: 64,\n replication_factor: 2,\n replica_groups: 1,\n nodes: Vec::new(),\n task_store: TaskStoreConfig::default(),\n admin: AdminConfig::default(),\n health: HealthConfig::default(),\n scatter: ScatterConfig::default(),\n rebalancer: RebalancerConfig::default(),\n server: ServerConfig::default(),\n connection_pool_per_node: ConnectionPoolConfig::default(),\n task_registry: TaskRegistryConfig::default(),\n resharding: advanced::ReshardingConfig::default(),\n hedging: advanced::HedgingConfig::default(),\n replica_selection: advanced::ReplicaSelectionConfig::default(),\n query_planner: advanced::QueryPlannerConfig::default(),\n settings_broadcast: advanced::SettingsBroadcastConfig::default(),\n settings_drift_check: advanced::SettingsDriftCheckConfig::default(),\n session_pinning: advanced::SessionPinningConfig::default(),\n aliases: advanced::AliasesConfig::default(),\n anti_entropy: advanced::AntiEntropyConfig::default(),\n dump_import: advanced::DumpImportConfig::default(),\n idempotency: advanced::IdempotencyConfig::default(),\n query_coalescing: advanced::QueryCoalescingConfig::default(),\n multi_search: advanced::MultiSearchConfig::default(),\n vector_search: advanced::VectorSearchConfig::default(),\n cdc: advanced::CdcConfig::default(),\n ttl: advanced::TtlConfig::default(),\n tenant_affinity: advanced::TenantAffinityConfig::default(),\n shadow: advanced::ShadowConfig::default(),\n ilm: advanced::IlmConfig::default(),\n canary_runner: advanced::CanaryRunnerConfig::default(),\n explain: advanced::ExplainConfig::default(),\n admin_ui: advanced::AdminUiConfig::default(),\n search_ui: advanced::SearchUiConfig::default(),\n tracing: advanced::TracingConfig::default(),\n peer_discovery: PeerDiscoveryConfig::default(),\n leader_election: LeaderElectionConfig::default(),\n hpa: HpaConfig::default(),\n }\n }\n}\n\nimpl MiroirConfig {\n /// Validate cross-field constraints. Returns `Ok(())` or a `ConfigError`.\n pub fn validate(&self) -> Result<(), ConfigError> {\n validate::validate(self)\n }\n\n /// Layered loading: file → env overrides → CLI overrides.\n pub fn load() -> Result {\n load::load()\n }\n\n /// Load from a specific file path with env-var overrides applied.\n pub fn load_from(path: &std::path::Path) -> Result {\n load::load_from(path)\n }\n\n /// Load from a YAML string (useful for testing).\n pub fn from_yaml(yaml: &str) -> Result {\n load::from_yaml(yaml)\n }\n}\n\n// ---------------------------------------------------------------------------\n// Core sub-structs (§4)\n// ---------------------------------------------------------------------------\n\n/// A single Meilisearch node in the cluster topology.\n#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]\npub struct NodeConfig {\n pub id: String,\n pub address: String,\n pub replica_group: u32,\n}\n\n/// Task store backend configuration.\n#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]\n#[serde(default)]\npub struct TaskStoreConfig {\n /// `sqlite` or `redis`.\n pub backend: String,\n /// Path to SQLite database file (sqlite backend).\n pub path: String,\n /// Redis URL (redis backend), e.g. `redis://host:6379`.\n pub url: String,\n}\n\nimpl Default for TaskStoreConfig {\n fn default() -> Self {\n Self {\n backend: \"sqlite\".into(),\n path: \"/data/miroir-tasks.db\".into(),\n url: String::new(),\n }\n }\n}\n\n/// Admin API configuration.\n#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]\n#[serde(default)]\npub struct AdminConfig {\n pub enabled: bool,\n /// Env override: `MIROIR_ADMIN_API_KEY`.\n pub api_key: String,\n}\n\nimpl Default for AdminConfig {\n fn default() -> Self {\n Self {\n enabled: true,\n api_key: String::new(),\n }\n }\n}\n\n/// Health check configuration.\n#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]\n#[serde(default)]\npub struct HealthConfig {\n pub interval_ms: u64,\n pub timeout_ms: u64,\n pub unhealthy_threshold: u32,\n pub recovery_threshold: u32,\n}\n\nimpl Default for HealthConfig {\n fn default() -> Self {\n Self {\n interval_ms: 5000,\n timeout_ms: 2000,\n unhealthy_threshold: 3,\n recovery_threshold: 2,\n }\n }\n}\n\n/// Scatter-gather query configuration.\n#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]\n#[serde(default)]\npub struct ScatterConfig {\n pub node_timeout_ms: u64,\n pub retry_on_timeout: bool,\n /// `partial` or `error`.\n pub unavailable_shard_policy: String,\n}\n\nimpl Default for ScatterConfig {\n fn default() -> Self {\n Self {\n node_timeout_ms: 5000,\n retry_on_timeout: true,\n unavailable_shard_policy: \"partial\".into(),\n }\n }\n}\n\n/// Rebalancer configuration.\n#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]\n#[serde(default)]\npub struct RebalancerConfig {\n pub auto_rebalance_on_recovery: bool,\n pub max_concurrent_migrations: u32,\n pub migration_timeout_s: u64,\n}\n\nimpl Default for RebalancerConfig {\n fn default() -> Self {\n Self {\n auto_rebalance_on_recovery: true,\n max_concurrent_migrations: 4,\n migration_timeout_s: 3600,\n }\n }\n}\n\n/// Server (HTTP listener) configuration.\n#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]\n#[serde(default)]\npub struct ServerConfig {\n pub port: u16,\n pub bind: String,\n pub max_body_bytes: u64,\n #[serde(default = \"default_max_concurrent_requests\")]\n pub max_concurrent_requests: u32,\n #[serde(default = \"default_request_timeout_ms\")]\n pub request_timeout_ms: u64,\n}\n\nfn default_max_concurrent_requests() -> u32 {\n 500\n}\nfn default_request_timeout_ms() -> u64 {\n 30000\n}\n\nimpl Default for ServerConfig {\n fn default() -> Self {\n Self {\n port: 7700,\n bind: \"0.0.0.0\".into(),\n max_body_bytes: 104_857_600, // 100 MiB\n max_concurrent_requests: default_max_concurrent_requests(),\n request_timeout_ms: default_request_timeout_ms(),\n }\n }\n}\n\n/// HTTP/2 connection pool per-node settings (§14.8).\n#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]\n#[serde(default)]\npub struct ConnectionPoolConfig {\n pub max_idle: u32,\n pub max_total: u32,\n pub idle_timeout_s: u64,\n}\n\nimpl Default for ConnectionPoolConfig {\n fn default() -> Self {\n Self {\n max_idle: 32,\n max_total: 128,\n idle_timeout_s: 60,\n }\n }\n}\n\n/// Task registry cache settings (§14.8) and TTL pruner config (plan §4).\n#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]\n#[serde(default)]\npub struct TaskRegistryConfig {\n pub cache_size: u32,\n pub redis_pool_max: u32,\n /// TTL for completed tasks in seconds. Tasks older than this are pruned.\n pub ttl_seconds: u64,\n /// How often the pruner runs, in seconds.\n pub prune_interval_s: u64,\n /// Maximum rows deleted per pruner iteration.\n pub prune_batch_size: u32,\n}\n\nimpl Default for TaskRegistryConfig {\n fn default() -> Self {\n Self {\n cache_size: 10000,\n redis_pool_max: 50,\n ttl_seconds: 7 * 24 * 3600, // 7 days\n prune_interval_s: 300, // 5 min\n prune_batch_size: 10000,\n }\n }\n}\n\n/// Peer discovery via Kubernetes headless Service (§14.5).\n#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]\n#[serde(default)]\npub struct PeerDiscoveryConfig {\n pub service_name: String,\n pub refresh_interval_s: u64,\n}\n\nimpl Default for PeerDiscoveryConfig {\n fn default() -> Self {\n Self {\n service_name: \"miroir-headless\".into(),\n refresh_interval_s: 15,\n }\n }\n}\n\n/// Leader election for Mode B background jobs (§14.5).\n#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]\n#[serde(default)]\npub struct LeaderElectionConfig {\n pub enabled: bool,\n pub lease_ttl_s: u64,\n pub renew_interval_s: u64,\n}\n\nimpl Default for LeaderElectionConfig {\n fn default() -> Self {\n Self {\n enabled: true,\n lease_ttl_s: 10,\n renew_interval_s: 3,\n }\n }\n}\n\n/// Horizontal Pod Autoscaler settings (Helm-only, informational in config).\n#[derive(Debug, Clone, PartialEq, Serialize, Deserialize, Default)]\n#[serde(default)]\npub struct HpaConfig {\n #[serde(default)]\n pub enabled: bool,\n}\n\n/// Policy for handling unavailable shards during scatter.\n#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]\n#[serde(rename_all = \"snake_case\")]\npub enum UnavailableShardPolicy {\n /// Return partial results from available nodes.\n Partial,\n /// Fail the request if any shard is unavailable.\n Error,\n /// Fall back to another replica group for unavailable shards.\n Fallback,\n}\n\nimpl Default for UnavailableShardPolicy {\n fn default() -> Self {\n Self::Partial\n }\n}\n\nimpl std::fmt::Display for UnavailableShardPolicy {\n fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {\n match self {\n Self::Partial => write!(f, \"partial\"),\n Self::Error => write!(f, \"error\"),\n Self::Fallback => write!(f, \"fallback\"),\n }\n }\n}\n\n#[cfg(test)]\nmod tests {\n use super::*;\n\n /// Returns a minimal valid dev config (single-node, sqlite, RF=1).\n fn dev_config() -> MiroirConfig {\n MiroirConfig {\n replication_factor: 1,\n task_store: TaskStoreConfig {\n backend: \"sqlite\".into(),\n ..Default::default()\n },\n cdc: advanced::CdcConfig {\n buffer: advanced::CdcBufferConfig {\n overflow: \"drop\".into(),\n ..Default::default()\n },\n ..Default::default()\n },\n search_ui: advanced::SearchUiConfig {\n rate_limit: advanced::SearchUiRateLimitConfig {\n backend: \"local\".into(),\n ..Default::default()\n },\n ..Default::default()\n },\n ..Default::default()\n }\n }\n\n #[test]\n fn default_config_is_valid() {\n let cfg = MiroirConfig::default();\n // Default has replication_factor=2 with sqlite, which should fail\n // validation — but the struct itself should construct fine.\n assert_eq!(cfg.shards, 64);\n assert_eq!(cfg.replication_factor, 2);\n assert_eq!(cfg.replica_groups, 1);\n assert_eq!(cfg.task_store.backend, \"sqlite\");\n }\n\n #[test]\n fn minimal_yaml_deserializes() {\n let yaml = r#\"\nshards: 32\nreplication_factor: 1\nnodes: []\n\"#;\n let cfg: MiroirConfig = serde_yaml::from_str(yaml).expect(\"deserialize\");\n assert_eq!(cfg.shards, 32);\n assert_eq!(cfg.replication_factor, 1);\n // All §13 blocks should get defaults\n assert!(cfg.resharding.enabled);\n assert!(cfg.hedging.enabled);\n assert!(cfg.anti_entropy.enabled);\n }\n\n #[test]\n fn full_plan_example_deserializes() {\n let yaml = r#\"\nmaster_key: \"test-key\"\nnode_master_key: \"node-key\"\nshards: 64\nreplication_factor: 2\nreplica_groups: 2\ntask_store:\n backend: redis\n url: \"redis://redis:6379\"\nadmin:\n enabled: true\nnodes:\n - id: \"meili-0\"\n address: \"http://meili-0.search.svc:7700\"\n replica_group: 0\n - id: \"meili-1\"\n address: \"http://meili-1.search.svc:7700\"\n replica_group: 0\nhealth:\n interval_ms: 5000\n timeout_ms: 2000\n unhealthy_threshold: 3\n recovery_threshold: 2\nscatter:\n node_timeout_ms: 5000\n retry_on_timeout: true\n unavailable_shard_policy: partial\nrebalancer:\n auto_rebalance_on_recovery: true\n max_concurrent_migrations: 4\n migration_timeout_s: 3600\nserver:\n port: 7700\n bind: \"0.0.0.0\"\n max_body_bytes: 104857600\nleader_election:\n enabled: true\n\"#;\n let cfg: MiroirConfig = serde_yaml::from_str(yaml).expect(\"deserialize\");\n assert_eq!(cfg.master_key, \"test-key\");\n assert_eq!(cfg.nodes.len(), 2);\n assert_eq!(cfg.replica_groups, 2);\n cfg.validate().expect(\"valid production config\");\n }\n\n #[test]\n fn round_trip_yaml() {\n let original = MiroirConfig::default();\n let yaml = serde_yaml::to_string(&original).expect(\"serialize\");\n let round_tripped: MiroirConfig = serde_yaml::from_str(&yaml).expect(\"deserialize\");\n assert_eq!(original, round_tripped);\n }\n\n #[test]\n fn validation_rejects_ha_with_sqlite() {\n let mut cfg = dev_config();\n cfg.replication_factor = 2;\n let err = cfg.validate().unwrap_err();\n assert!(err.to_string().contains(\"redis\"));\n }\n\n #[test]\n fn validation_rejects_zero_shards() {\n let mut cfg = dev_config();\n cfg.shards = 0;\n let err = cfg.validate().unwrap_err();\n assert!(err.to_string().contains(\"shards\"));\n }\n\n #[test]\n fn validation_rejects_duplicate_node_ids() {\n let mut cfg = dev_config();\n cfg.nodes = vec![\n NodeConfig {\n id: \"n0\".into(),\n address: \"http://n0\".into(),\n replica_group: 0,\n },\n NodeConfig {\n id: \"n0\".into(),\n address: \"http://n0b\".into(),\n replica_group: 0,\n },\n ];\n let err = cfg.validate().unwrap_err();\n assert!(err.to_string().contains(\"duplicate\"));\n }\n\n #[test]\n fn validation_rejects_node_outside_replica_groups() {\n let mut cfg = dev_config();\n cfg.nodes = vec![NodeConfig {\n id: \"n0\".into(),\n address: \"http://n0\".into(),\n replica_group: 5,\n }];\n let err = cfg.validate().unwrap_err();\n assert!(err.to_string().contains(\"replica_group\"));\n }\n\n #[test]\n fn validation_rejects_scoped_key_timing_inversion() {\n let mut cfg = dev_config();\n cfg.search_ui.scoped_key_max_age_days = 10;\n cfg.search_ui.scoped_key_rotate_before_expiry_days = 10;\n let err = cfg.validate().unwrap_err();\n assert!(err.to_string().contains(\"scoped_key\"));\n }\n\n #[test]\n fn advanced_defaults_all_enabled() {\n let cfg = MiroirConfig::default();\n assert!(cfg.resharding.enabled);\n assert!(cfg.hedging.enabled);\n assert!(cfg.replica_selection.strategy == \"adaptive\");\n assert!(cfg.query_planner.enabled);\n assert!(cfg.settings_broadcast.strategy == \"two_phase\");\n assert!(cfg.session_pinning.enabled);\n assert!(cfg.aliases.enabled);\n assert!(cfg.anti_entropy.enabled);\n assert!(cfg.dump_import.mode == \"streaming\");\n assert!(cfg.idempotency.enabled);\n assert!(cfg.query_coalescing.enabled);\n assert!(cfg.multi_search.enabled);\n assert!(cfg.vector_search.enabled);\n assert!(cfg.cdc.enabled);\n assert!(cfg.ttl.enabled);\n assert!(cfg.tenant_affinity.enabled);\n assert!(cfg.shadow.enabled);\n assert!(cfg.ilm.enabled);\n assert!(cfg.canary_runner.enabled);\n assert!(cfg.explain.enabled);\n assert!(cfg.admin_ui.enabled);\n assert!(cfg.search_ui.enabled);\n }\n\n #[test]\n fn config_from_yaml_valid() {\n let yaml = r#\"\nshards: 32\nreplication_factor: 1\nnodes: []\ntask_store:\n backend: redis\n\"#;\n let cfg = MiroirConfig::from_yaml(yaml).unwrap();\n assert_eq!(cfg.shards, 32);\n }\n\n #[test]\n fn unavailable_shard_policy_default_and_display() {\n let policy: UnavailableShardPolicy = Default::default();\n assert!(matches!(policy, UnavailableShardPolicy::Partial));\n assert_eq!(format!(\"{}\", policy), \"partial\");\n assert_eq!(format!(\"{}\", UnavailableShardPolicy::Error), \"error\");\n assert_eq!(format!(\"{}\", UnavailableShardPolicy::Fallback), \"fallback\");\n }\n\n #[test]\n fn load_from_file_reads_yaml() {\n let yaml = r#\"\nshards: 16\nreplication_factor: 1\nnodes: []\ntask_store:\n backend: redis\n\"#;\n let dir = tempfile::tempdir().unwrap();\n let path = dir.path().join(\"miroir.yaml\");\n std::fs::write(&path, yaml).unwrap();\n let cfg = MiroirConfig::load_from(&path).unwrap();\n assert_eq!(cfg.shards, 16);\n }\n\n #[test]\n fn load_from_missing_file_fails() {\n let cfg = MiroirConfig::load_from(std::path::Path::new(\"/nonexistent/miroir.yaml\"));\n assert!(cfg.is_err());\n }\n\n /// Drift guard: ensure Config::default() matches §14.8 reference defaults.\n ///\n /// This test serializes the default config and compares key §14.8 knobs\n /// against the reference fixture. If this fails, either the Rust defaults\n /// have drifted from §14.8, or the plan needs updating.\n #[test]\n fn section_14_8_defaults_match() {\n let cfg = MiroirConfig::default();\n\n // §14.8 server defaults\n assert_eq!(cfg.server.max_body_bytes, 104_857_600, \"server.max_body_bytes\");\n assert_eq!(cfg.server.max_concurrent_requests, 500, \"server.max_concurrent_requests\");\n assert_eq!(cfg.server.request_timeout_ms, 30_000, \"server.request_timeout_ms\");\n\n // §14.8 connection_pool_per_node defaults\n assert_eq!(cfg.connection_pool_per_node.max_idle, 32, \"connection_pool_per_node.max_idle\");\n assert_eq!(cfg.connection_pool_per_node.max_total, 128, \"connection_pool_per_node.max_total\");\n assert_eq!(cfg.connection_pool_per_node.idle_timeout_s, 60, \"connection_pool_per_node.idle_timeout_s\");\n\n // §14.8 task_registry defaults\n assert_eq!(cfg.task_registry.cache_size, 10_000, \"task_registry.cache_size\");\n assert_eq!(cfg.task_registry.redis_pool_max, 50, \"task_registry.redis_pool_max\");\n\n // §14.8 idempotency defaults\n assert_eq!(cfg.idempotency.max_cached_keys, 1_000_000, \"idempotency.max_cached_keys\");\n assert_eq!(cfg.idempotency.ttl_seconds, 86_400, \"idempotency.ttl_seconds\");\n\n // §14.8 session_pinning defaults\n assert_eq!(cfg.session_pinning.max_sessions, 100_000, \"session_pinning.max_sessions\");\n\n // §14.8 query_coalescing defaults\n assert_eq!(cfg.query_coalescing.max_subscribers, 1_000, \"query_coalescing.max_subscribers\");\n assert_eq!(cfg.query_coalescing.max_pending_queries, 10_000, \"query_coalescing.max_pending_queries\");\n\n // §14.8 anti_entropy defaults\n assert_eq!(cfg.anti_entropy.max_read_concurrency, 2, \"anti_entropy.max_read_concurrency\");\n assert_eq!(cfg.anti_entropy.fingerprint_batch_size, 1_000, \"anti_entropy.fingerprint_batch_size\");\n\n // §14.8 resharding defaults\n assert_eq!(cfg.resharding.backfill_concurrency, 4, \"resharding.backfill_concurrency\");\n 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Miroir core library\n2\t//!\n3\t//! Provides routing, merging, and topology logic for the Miroir distributed search proxy.\n4\t\n5\tpub mod alias;\n6\tpub mod anti_entropy;\n7\tpub mod api_error;\n8\tpub mod canary;\n9\tpub mod cdc;\n10\tpub mod config;\n11\tpub mod drift_reconciler;\n12\tpub mod dump;\n13\tpub mod dump_import;\n14\tpub mod error;\n15\tpub mod explainer;\n16\tpub mod hedging;\n17\tpub mod idempotency;\n18\tpub mod ilm;\n19\tpub mod merger;\n20\tpub mod migration;\n21\t#[cfg(feature = \"peer-discovery\")]\n22\tpub mod peer_discovery;\n23\tpub mod multi_search;\n24\tpub mod query_planner;\n25\tpub mod rebalancer;\n26\tpub mod rebalancer_worker;\n27\tpub mod replica_selection;\n28\tpub mod reshard;\n29\tpub mod router;\n30\tpub mod schema_migrations;\n31\tpub mod scatter;\n32\tpub mod session_pinning;\n33\tpub mod settings;\n34\tpub mod shadow;\n35\tpub mod task;\n36\tpub mod task_pruner;\n37\tpub mod task_registry;\n38\tpub mod task_store;\n39\tpub mod tenant;\n40\tpub mod topology;\n41\tpub mod ttl;\n42\t\n43\t#[cfg(feature = \"raft-proto\")]\n44\tpub mod raft_proto;\n45\t\n46\t// Public re-exports\n47\tpub use api_error::{ErrorType, MeilisearchError, MiroirCode};\n48\tpub use error::{MiroirError, Result};\n49\t"}]},"parent_tool_use_id":null,"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","uuid":"9094d03a-4e84-464b-abeb-903fb4feb00e","timestamp":"2026-05-23T06:48:47.336Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/crates/miroir-core/src/lib.rs","content":"//! Miroir core library\n//!\n//! Provides routing, merging, and topology logic for the Miroir distributed search proxy.\n\npub mod alias;\npub mod anti_entropy;\npub mod api_error;\npub mod canary;\npub mod cdc;\npub mod config;\npub mod drift_reconciler;\npub mod dump;\npub mod dump_import;\npub mod error;\npub mod explainer;\npub mod hedging;\npub mod idempotency;\npub mod ilm;\npub mod merger;\npub mod migration;\n#[cfg(feature = \"peer-discovery\")]\npub mod peer_discovery;\npub mod multi_search;\npub mod query_planner;\npub mod rebalancer;\npub mod rebalancer_worker;\npub mod replica_selection;\npub mod reshard;\npub mod router;\npub mod schema_migrations;\npub mod scatter;\npub mod session_pinning;\npub mod settings;\npub mod shadow;\npub mod task;\npub mod task_pruner;\npub mod task_registry;\npub mod task_store;\npub mod tenant;\npub mod topology;\npub mod ttl;\n\n#[cfg(feature = \"raft-proto\")]\npub mod raft_proto;\n\n// Public re-exports\npub use api_error::{ErrorType, MeilisearchError, MiroirCode};\npub use error::{MiroirError, Result};\n","numLines":49,"startLine":1,"totalLines":49}}} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_906813d65a854ec089e87c1c","type":"tool_result","content":"1\t[package]\n2\tname = \"miroir-core\"\n3\tversion.workspace = true\n4\tedition.workspace = true\n5\tlicense.workspace = true\n6\trepository.workspace = true\n7\tautobenches = false\n8\t\n9\t[dependencies]\n10\tserde = { workspace = true }\n11\tserde_json = { workspace = true }\n12\tserde_yaml = \"0.9\"\n13\ttwox-hash = \"2\"\n14\tthiserror = { workspace = true }\n15\ttracing = { workspace = true }\n16\tuuid = { version = \"1\", features = [\"v4\", \"serde\"] }\n17\tconfig = \"0.14\"\n18\trusqlite = { workspace = true }\n19\tfutures-util = \"0.3\"\n20\t# Redis support (optional — enable via `redis-store` feature)\n21\tredis = { version = \"0.27\", features = [\"aio\", \"tokio-comp\", \"connection-manager\"], optional = true }\n22\thex = \"0.4\"\n23\ttokio = { version = \"1\", features = [\"rt\", \"rt-multi-thread\", \"time\", \"sync\", \"macros\"] }\n24\tasync-trait = \"0.1\"\n25\trand = \"0.8\"\n26\treqwest = { version = \"0.12\", features = [\"json\"], default-features = false }\n27\turlencoding = \"2\"\n28\tsha2 = \"0.10\"\n29\tindexmap = \"2\"\n30\tchrono = { version = \"0.4\", features = [\"serde\"] }\n31\tregex = \"1\"\n32\ttrust-dns-resolver = { version = \"0.12\", optional = true }\n33\t# Axum integration (optional — enable via `axum` feature)\n34\taxum = { version = \"0.7\", optional = true }\n35\t\n36\t# Raft prototype (P12.OP2 research) — not for production use\n37\t# openraft 0.9.22 fails on stable Rust 1.87 (validit uses let_chains).\n38\t# The prototype simulates Raft; only bincode is needed for serialization benchmarks.\n39\tbincode = { version = \"2\", features = [\"serde\"], optional = true }\n40\t\n41\t[features]\n42\tdefault = []\n43\traft-proto = [\"bincode\"]\n44\tredis-store = [\"redis\"]\n45\taxum = 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Drift reconciler background worker (plan §13.5).\n2\t//!\n3\t//! Detects and repairs settings drift across nodes caused by out-of-band changes\n4\t//! (e.g., operator SSH'd to a node and called PATCH directly).\n5\t//!\n6\t//! Runs every `settings_drift_check.interval_s` seconds (default 5 min), hashing\n7\t//! each node's settings and repairing mismatches. Uses Mode B leader election\n8\t//! for horizontal scaling.\n9\t\n10\tuse crate::error::{MiroirError, Result};\n11\tuse crate::settings::fingerprint_settings;\n12\tuse crate::task_store::TaskStore;\n13\tuse reqwest::Client;\n14\tuse serde_json::Value;\n15\tuse std::sync::Arc;\n16\tuse std::time::Duration;\n17\tuse tokio::sync::RwLock;\n18\tuse tracing::{debug, error, info, warn};\n19\t\n20\t/// Callback type for recording drift repair metrics.\n21\tpub type DriftRepairMetrics = Arc;\n22\t\n23\t/// Configuration for the drift reconciler.\n24\t#[derive(Clone)]\n25\tpub struct DriftReconcilerConfig {\n26\t /// Check interval in seconds.\n27\t pub interval_s: u64,\n28\t /// Whether to auto-repair detected drift.\n29\t pub auto_repair: bool,\n30\t /// Node master key for authentication.\n31\t pub node_master_key: String,\n32\t /// Node addresses to check.\n33\t pub node_addresses: Vec,\n34\t /// Leader election scope for Mode B scaling.\n35\t pub leader_scope: String,\n36\t /// This pod's ID for leader election.\n37\t pub pod_id: String,\n38\t}\n39\t\n40\t/// Drift reconciler background worker.\n41\tpub struct DriftReconciler {\n42\t config: DriftReconcilerConfig,\n43\t client: Client,\n44\t task_store: Arc,\n45\t /// Indexes to check (empty = all indexes).\n46\t indexes: Arc>>,\n47\t /// Callback for recording drift repair metrics.\n48\t metrics_callback: Option,\n49\t}\n50\t\n51\timpl DriftReconciler {\n52\t /// Create a new drift reconciler.\n53\t pub fn new(\n54\t config: DriftReconcilerConfig,\n55\t task_store: Arc,\n56\t ) -> Self {\n57\t Self::with_metrics(config, task_store, None)\n58\t }\n59\t\n60\t /// Create a new drift reconciler with metrics callback.\n61\t pub fn with_metrics(\n62\t config: DriftReconcilerConfig,\n63\t task_store: Arc,\n64\t metrics_callback: Option,\n65\t ) -> Self {\n66\t let client = Client::builder()\n67\t .timeout(Duration::from_secs(10))\n68\t .build()\n69\t .expect(\"Failed to create HTTP client\");\n70\t\n71\t Self {\n72\t config,\n73\t client,\n74\t task_store,\n75\t indexes: Arc::new(RwLock::new(Vec::new())),\n76\t metrics_callback,\n77\t }\n78\t }\n79\t\n80\t /// Start the drift reconciler background task.\n81\t pub async fn run(&self) {\n82\t let mut interval = tokio::time::interval(Duration::from_secs(self.config.interval_s));\n83\t let mut leader_election_interval = tokio::time::interval(Duration::from_secs(3));\n84\t\n85\t info!(\n86\t interval_s = self.config.interval_s,\n87\t auto_repair = self.config.auto_repair,\n88\t \"drift reconciler started\"\n89\t );\n90\t\n91\t loop {\n92\t tokio::select! {\n93\t _ = interval.tick() => {\n94\t if self.is_leader_async().await {\n95\t if let Err(e) = self.check_and_repair().await {\n96\t error!(error = %e, \"drift check failed\");\n97\t }\n98\t }\n99\t }\n100\t _ = leader_election_interval.tick() => {\n101\t // Renew leader lease\n102\t let _ = self.renew_leader_lease();\n103\t }\n104\t }\n105\t }\n106\t }\n107\t\n108\t /// Check if this pod is the leader (Mode B leader election).\n109\t fn is_leader(&self) -> bool {\n110\t let now = now_ms();\n111\t let lease_ttl = now + (self.config.interval_s as i64 * 1000 * 2);\n112\t\n113\t self.task_store\n114\t .try_acquire_leader_lease(\n115\t &self.config.leader_scope,\n116\t &self.config.pod_id,\n117\t lease_ttl,\n118\t now,\n119\t )\n120\t .unwrap_or(false)\n121\t }\n122\t\n123\t /// Check if this pod is the leader asynchronously (for use in async context).\n124\t async fn is_leader_async(&self) -> bool {\n125\t self.is_leader()\n126\t }\n127\t\n128\t /// Renew the leader lease.\n129\t fn renew_leader_lease(&self) {\n130\t let now = now_ms();\n131\t let lease_ttl = now + (self.config.interval_s as i64 * 1000 * 2);\n132\t\n133\t let _ = self.task_store\n134\t .renew_leader_lease(&self.config.leader_scope, &self.config.pod_id, lease_ttl);\n135\t }\n136\t\n137\t /// Check all nodes for drift and repair if configured.\n138\t async fn check_and_repair(&self) -> Result<()> {\n139\t debug!(\"starting drift check\");\n140\t\n141\t // Get list of indexes to check (from first node)\n142\t let indexes = self.list_indexes().await?;\n143\t let indexes_to_check: Vec<_> = if self.indexes.read().await.is_empty() {\n144\t indexes\n145\t } else {\n146\t let filter = self.indexes.read().await.clone();\n147\t indexes.into_iter().filter(|i| filter.contains(i)).collect()\n148\t };\n149\t\n150\t let mut total_mismatches = 0u64;\n151\t let mut total_repairs = 0u64;\n152\t\n153\t for index in &indexes_to_check {\n154\t match self.check_index_drift(index).await? {\n155\t DriftCheckResult::NoDrift => {\n156\t debug!(index = %index, \"no drift detected\");\n157\t }\n158\t DriftCheckResult::DriftDetected { mismatches } => {\n159\t total_mismatches += mismatches.len() as u64;\n160\t warn!(\n161\t index = %index,\n162\t mismatches = mismatches.len(),\n163\t \"drift detected\"\n164\t );\n165\t\n166\t if self.config.auto_repair {\n167\t for (node_id, address) in &mismatches {\n168\t match self.repair_node_settings(index, address, node_id).await {\n169\t Ok(_) => {\n170\t total_repairs += 1;\n171\t info!(index = %index, node = %node_id, \"drift repaired\");\n172\t }\n173\t Err(e) => {\n174\t error!(index = %index, node = %node_id, error = %e, \"drift repair failed\");\n175\t }\n176\t }\n177\t }\n178\t }\n179\t }\n180\t DriftCheckResult::Error(e) => {\n181\t error!(index = %index, error = %e, \"drift check error\");\n182\t }\n183\t }\n184\t }\n185\t\n186\t if total_mismatches > 0 {\n187\t info!(\n188\t total_mismatches,\n189\t total_repairs,\n190\t \"drift check complete\"\n191\t );\n192\t }\n193\t\n194\t Ok(())\n195\t }\n196\t\n197\t /// List all indexes from the first node.\n198\t async fn list_indexes(&self) -> Result> {\n199\t let first_address = self.config.node_addresses.first()\n200\t .ok_or_else(|| MiroirError::Topology(\"no nodes configured\".into()))?;\n201\t\n202\t let url = format!(\"{}/indexes\", first_address.trim_end_matches('/'));\n203\t let response = self.client\n204\t .get(&url)\n205\t .header(\"Authorization\", format!(\"Bearer {}\", self.config.node_master_key))\n206\t .send()\n207\t .await\n208\t .map_err(|e| MiroirError::Task(format!(\"failed to list indexes: {}\", e)))?;\n209\t\n210\t if !response.status().is_success() {\n211\t return Err(MiroirError::Task(format!(\n212\t \"failed to list indexes: HTTP {}\",\n213\t response.status()\n214\t )));\n215\t }\n216\t\n217\t let json: Value = response.json().await\n218\t .map_err(|e| MiroirError::Task(format!(\"failed to parse indexes: {}\", e)))?;\n219\t\n220\t let results = json.get(\"results\")\n221\t .and_then(|v| v.as_array())\n222\t .ok_or_else(|| MiroirError::Task(\"invalid indexes response\".into()))?;\n223\t\n224\t Ok(results\n225\t .iter()\n226\t .filter_map(|v| v.get(\"uid\").and_then(|uid| uid.as_str()).map(|s| s.to_string()))\n227\t .collect())\n228\t }\n229\t\n230\t /// Check a single index for drift across all nodes.\n231\t async fn check_index_drift(&self, index: &str) -> Result {\n232\t let mut node_settings: Vec<(String, String, Value)> = Vec::new();\n233\t\n234\t // Fetch settings from all nodes\n235\t for (node_id, address) in self.node_addresses_with_ids() {\n236\t let url = format!(\"{}/indexes/{}/settings\", address.trim_end_matches('/'), index);\n237\t match self.client\n238\t .get(&url)\n239\t .header(\"Authorization\", format!(\"Bearer {}\", self.config.node_master_key))\n240\t .send()\n241\t .await\n242\t {\n243\t Ok(resp) if resp.status().is_success() => {\n244\t if let Ok(settings) = resp.json::().await {\n245\t node_settings.push((node_id, address, settings));\n246\t }\n247\t }\n248\t Ok(resp) => {\n249\t return Ok(DriftCheckResult::Error(\n250\t MiroirError::Task(format!(\"node {} returned HTTP {}\", node_id, resp.status()))\n251\t ));\n252\t }\n253\t Err(e) => {\n254\t return Ok(DriftCheckResult::Error(\n255\t MiroirError::Task(format!(\"node {} request failed: {}\", node_id, e))\n256\t ));\n257\t }\n258\t }\n259\t }\n260\t\n261\t if node_settings.is_empty() {\n262\t return Ok(DriftCheckResult::NoDrift);\n263\t }\n264\t\n265\t // Compute fingerprint for each node's settings\n266\t let mut fingerprints: Vec<(String, String, String)> = Vec::new();\n267\t for (node_id, address, settings) in &node_settings {\n268\t let fp = fingerprint_settings(settings);\n269\t fingerprints.push((node_id.clone(), address.clone(), fp));\n270\t }\n271\t\n272\t // Check for mismatches (compare all to first node's fingerprint)\n273\t let first_fp = &fingerprints.first().ok_or_else(|| MiroirError::Task(\"no fingerprints\".into()))?.2;\n274\t let mismatches: Vec<(String, String)> = fingerprints\n275\t .iter()\n276\t .filter(|(_, _, fp)| fp != first_fp)\n277\t .map(|(node_id, address, _)| (node_id.clone(), address.clone()))\n278\t .collect();\n279\t\n280\t if mismatches.is_empty() {\n281\t Ok(DriftCheckResult::NoDrift)\n282\t } else {\n283\t Ok(DriftCheckResult::DriftDetected { mismatches })\n284\t }\n285\t }\n286\t\n287\t /// Repair settings on a drifted node by copying from the first node.\n288\t async fn repair_node_settings(&self, index: &str, drifted_address: &str, drifted_node_id: &str) -> Result<()> {\n289\t // Get correct settings from the first healthy node\n290\t let first_address = self.config.node_addresses.first()\n291\t .ok_or_else(|| MiroirError::Topology(\"no nodes configured\".into()))?;\n292\t\n293\t let url = format!(\"{}/indexes/{}/settings\", first_address.trim_end_matches('/'), index);\n294\t let response = self.client\n295\t .get(&url)\n296\t .header(\"Authorization\", format!(\"Bearer {}\", self.config.node_master_key))\n297\t .send()\n298\t .await\n299\t .map_err(|e| MiroirError::Task(format!(\"failed to fetch settings for repair: {}\", e)))?;\n300\t\n301\t if !response.status().is_success() {\n302\t return Err(MiroirError::Task(format!(\n303\t \"failed to fetch settings for repair: HTTP {}\",\n304\t response.status()\n305\t )));\n306\t }\n307\t\n308\t let correct_settings: Value = response.json().await\n309\t .map_err(|e| MiroirError::Task(format!(\"failed to parse settings for repair: {}\", e)))?;\n310\t\n311\t // PATCH the drifted node with correct settings\n312\t let patch_url = format!(\"{}/indexes/{}/settings\", drifted_address.trim_end_matches('/'), index);\n313\t let patch_response = self.client\n314\t .patch(&patch_url)\n315\t .header(\"Authorization\", format!(\"Bearer {}\", self.config.node_master_key))\n316\t .json(&correct_settings)\n317\t .send()\n318\t .await\n319\t .map_err(|e| MiroirError::Task(format!(\"failed to repair settings: {}\", e)))?;\n320\t\n321\t if !patch_response.status().is_success() {\n322\t return Err(MiroirError::Task(format!(\n323\t \"failed to repair settings: HTTP {}\",\n324\t patch_response.status()\n325\t )));\n326\t }\n327\t\n328\t // Record metrics if callback is set\n329\t if let Some(ref callback) = self.metrics_callback {\n330\t callback(index, drifted_node_id);\n331\t }\n332\t\n333\t Ok(())\n334\t }\n335\t\n336\t /// Get node addresses with their IDs.\n337\t fn node_addresses_with_ids(&self) -> Vec<(String, String)> {\n338\t self.config.node_addresses\n339\t .iter()\n340\t .enumerate()\n341\t .map(|(i, addr)| (format!(\"node-{}\", i), addr.clone()))\n342\t .collect()\n343\t }\n344\t}\n345\t\n346\t/// Result of a drift check.\n347\tenum DriftCheckResult {\n348\t NoDrift,\n349\t DriftDetected { mismatches: Vec<(String, String)> },\n350\t Error(MiroirError),\n351\t}\n352\t\n353\t/// Get current time in milliseconds since Unix epoch.\n354\tfn now_ms() -> i64 {\n355\t std::time::SystemTime::now()\n356\t .duration_since(std::time::UNIX_EPOCH)\n357\t .unwrap_or_default()\n358\t .as_millis() as i64\n359\t}\n360\t\n361\t#[cfg(test)]\n362\tmod tests {\n363\t use super::*;\n364\t\n365\t #[test]\n366\t fn test_node_addresses_with_ids() {\n367\t let config = DriftReconcilerConfig {\n368\t interval_s: 300,\n369\t auto_repair: true,\n370\t node_master_key: \"test\".to_string(),\n371\t node_addresses: vec![\n372\t \"http://node1:7700\".to_string(),\n373\t \"http://node2:7700\".to_string(),\n374\t ],\n375\t leader_scope: \"drift_reconciler\".to_string(),\n376\t pod_id: \"pod-1\".to_string(),\n377\t };\n378\t\n379\t let reconciler = DriftReconciler::new(\n380\t config,\n381\t Arc::new(crate::task_store::SqliteTaskStore::open_in_memory().unwrap()),\n382\t );\n383\t\n384\t let addresses = reconciler.node_addresses_with_ids();\n385\t assert_eq!(addresses.len(), 2);\n386\t assert_eq!(addresses[0].0, \"node-0\");\n387\t assert_eq!(addresses[0].1, \"http://node1:7700\");\n388\t assert_eq!(addresses[1].0, \"node-1\");\n389\t assert_eq!(addresses[1].1, \"http://node2:7700\");\n390\t }\n391\t}\n392\t"}]},"parent_tool_use_id":null,"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","uuid":"5e496d0c-6699-4863-8fe0-c20380f6984c","timestamp":"2026-05-23T06:48:51.876Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/crates/miroir-core/src/drift_reconciler.rs","content":"//! Drift reconciler background worker (plan §13.5).\n//!\n//! Detects and repairs settings drift across nodes caused by out-of-band changes\n//! (e.g., operator SSH'd to a node and called PATCH directly).\n//!\n//! Runs every `settings_drift_check.interval_s` seconds (default 5 min), hashing\n//! each node's settings and repairing mismatches. Uses Mode B leader election\n//! for horizontal scaling.\n\nuse crate::error::{MiroirError, Result};\nuse crate::settings::fingerprint_settings;\nuse crate::task_store::TaskStore;\nuse reqwest::Client;\nuse serde_json::Value;\nuse std::sync::Arc;\nuse std::time::Duration;\nuse tokio::sync::RwLock;\nuse tracing::{debug, error, info, warn};\n\n/// Callback type for recording drift repair metrics.\npub type DriftRepairMetrics = Arc;\n\n/// Configuration for the drift reconciler.\n#[derive(Clone)]\npub struct DriftReconcilerConfig {\n /// Check interval in seconds.\n pub interval_s: u64,\n /// Whether to auto-repair detected drift.\n pub auto_repair: bool,\n /// Node master key for authentication.\n pub node_master_key: String,\n /// Node addresses to check.\n pub node_addresses: Vec,\n /// Leader election scope for Mode B scaling.\n pub leader_scope: String,\n /// This pod's ID for leader election.\n pub pod_id: String,\n}\n\n/// Drift reconciler background worker.\npub struct DriftReconciler {\n config: DriftReconcilerConfig,\n client: Client,\n task_store: Arc,\n /// Indexes to check (empty = all indexes).\n indexes: Arc>>,\n /// Callback for recording drift repair metrics.\n metrics_callback: Option,\n}\n\nimpl DriftReconciler {\n /// Create a new drift reconciler.\n pub fn new(\n config: DriftReconcilerConfig,\n task_store: Arc,\n ) -> Self {\n Self::with_metrics(config, task_store, None)\n }\n\n /// Create a new drift reconciler with metrics callback.\n pub fn with_metrics(\n config: DriftReconcilerConfig,\n task_store: Arc,\n metrics_callback: Option,\n ) -> Self {\n let client = Client::builder()\n .timeout(Duration::from_secs(10))\n .build()\n .expect(\"Failed to create HTTP client\");\n\n Self {\n config,\n client,\n task_store,\n indexes: Arc::new(RwLock::new(Vec::new())),\n metrics_callback,\n }\n }\n\n /// Start the drift reconciler background task.\n pub async fn run(&self) {\n let mut interval = tokio::time::interval(Duration::from_secs(self.config.interval_s));\n let mut leader_election_interval = tokio::time::interval(Duration::from_secs(3));\n\n info!(\n interval_s = self.config.interval_s,\n auto_repair = self.config.auto_repair,\n \"drift reconciler started\"\n );\n\n loop {\n tokio::select! {\n _ = interval.tick() => {\n if self.is_leader_async().await {\n if let Err(e) = self.check_and_repair().await {\n error!(error = %e, \"drift check failed\");\n }\n }\n }\n _ = leader_election_interval.tick() => {\n // Renew leader lease\n let _ = self.renew_leader_lease();\n }\n }\n }\n }\n\n /// Check if this pod is the leader (Mode B leader election).\n fn is_leader(&self) -> bool {\n let now = now_ms();\n let lease_ttl = now + (self.config.interval_s as i64 * 1000 * 2);\n\n self.task_store\n .try_acquire_leader_lease(\n &self.config.leader_scope,\n &self.config.pod_id,\n lease_ttl,\n now,\n )\n .unwrap_or(false)\n }\n\n /// Check if this pod is the leader asynchronously (for use in async context).\n async fn is_leader_async(&self) -> bool {\n self.is_leader()\n }\n\n /// Renew the leader lease.\n fn renew_leader_lease(&self) {\n let now = now_ms();\n let lease_ttl = now + (self.config.interval_s as i64 * 1000 * 2);\n\n let _ = self.task_store\n .renew_leader_lease(&self.config.leader_scope, &self.config.pod_id, lease_ttl);\n }\n\n /// Check all nodes for drift and repair if configured.\n async fn check_and_repair(&self) -> Result<()> {\n debug!(\"starting drift check\");\n\n // Get list of indexes to check (from first node)\n let indexes = self.list_indexes().await?;\n let indexes_to_check: Vec<_> = if self.indexes.read().await.is_empty() {\n indexes\n } else {\n let filter = self.indexes.read().await.clone();\n indexes.into_iter().filter(|i| filter.contains(i)).collect()\n };\n\n let mut total_mismatches = 0u64;\n let mut total_repairs = 0u64;\n\n for index in &indexes_to_check {\n match self.check_index_drift(index).await? {\n DriftCheckResult::NoDrift => {\n debug!(index = %index, \"no drift detected\");\n }\n DriftCheckResult::DriftDetected { mismatches } => {\n total_mismatches += mismatches.len() as u64;\n warn!(\n index = %index,\n mismatches = mismatches.len(),\n \"drift detected\"\n );\n\n if self.config.auto_repair {\n for (node_id, address) in &mismatches {\n match self.repair_node_settings(index, address, node_id).await {\n Ok(_) => {\n total_repairs += 1;\n info!(index = %index, node = %node_id, \"drift repaired\");\n }\n Err(e) => {\n error!(index = %index, node = %node_id, error = %e, \"drift repair failed\");\n }\n }\n }\n }\n }\n DriftCheckResult::Error(e) => {\n error!(index = %index, error = %e, \"drift check error\");\n }\n }\n }\n\n if total_mismatches > 0 {\n info!(\n total_mismatches,\n total_repairs,\n \"drift check complete\"\n );\n }\n\n Ok(())\n }\n\n /// List all indexes from the first node.\n async fn list_indexes(&self) -> Result> {\n let first_address = self.config.node_addresses.first()\n .ok_or_else(|| MiroirError::Topology(\"no nodes configured\".into()))?;\n\n let url = format!(\"{}/indexes\", first_address.trim_end_matches('/'));\n let response = self.client\n .get(&url)\n .header(\"Authorization\", format!(\"Bearer {}\", self.config.node_master_key))\n .send()\n .await\n .map_err(|e| MiroirError::Task(format!(\"failed to list indexes: {}\", e)))?;\n\n if !response.status().is_success() {\n return Err(MiroirError::Task(format!(\n \"failed to list indexes: HTTP {}\",\n response.status()\n )));\n }\n\n let json: Value = response.json().await\n .map_err(|e| MiroirError::Task(format!(\"failed to parse indexes: {}\", e)))?;\n\n let results = json.get(\"results\")\n .and_then(|v| v.as_array())\n .ok_or_else(|| MiroirError::Task(\"invalid indexes response\".into()))?;\n\n Ok(results\n .iter()\n .filter_map(|v| v.get(\"uid\").and_then(|uid| uid.as_str()).map(|s| s.to_string()))\n .collect())\n }\n\n /// Check a single index for drift across all nodes.\n async fn check_index_drift(&self, index: &str) -> Result {\n let mut node_settings: Vec<(String, String, Value)> = Vec::new();\n\n // Fetch settings from all nodes\n for (node_id, address) in self.node_addresses_with_ids() {\n let url = format!(\"{}/indexes/{}/settings\", address.trim_end_matches('/'), index);\n match self.client\n .get(&url)\n .header(\"Authorization\", format!(\"Bearer {}\", self.config.node_master_key))\n .send()\n .await\n {\n Ok(resp) if resp.status().is_success() => {\n if let Ok(settings) = resp.json::().await {\n node_settings.push((node_id, address, settings));\n }\n }\n Ok(resp) => {\n return Ok(DriftCheckResult::Error(\n MiroirError::Task(format!(\"node {} returned HTTP {}\", node_id, resp.status()))\n ));\n }\n Err(e) => {\n return Ok(DriftCheckResult::Error(\n MiroirError::Task(format!(\"node {} request failed: {}\", node_id, e))\n ));\n }\n }\n }\n\n if node_settings.is_empty() {\n return Ok(DriftCheckResult::NoDrift);\n }\n\n // Compute fingerprint for each node's settings\n let mut fingerprints: Vec<(String, String, String)> = Vec::new();\n for (node_id, address, settings) in &node_settings {\n let fp = fingerprint_settings(settings);\n fingerprints.push((node_id.clone(), address.clone(), fp));\n }\n\n // Check for mismatches (compare all to first node's fingerprint)\n let first_fp = &fingerprints.first().ok_or_else(|| MiroirError::Task(\"no fingerprints\".into()))?.2;\n let mismatches: Vec<(String, String)> = fingerprints\n .iter()\n .filter(|(_, _, fp)| fp != first_fp)\n .map(|(node_id, address, _)| (node_id.clone(), address.clone()))\n .collect();\n\n if mismatches.is_empty() {\n Ok(DriftCheckResult::NoDrift)\n } else {\n Ok(DriftCheckResult::DriftDetected { mismatches })\n }\n }\n\n /// Repair settings on a drifted node by copying from the first node.\n async fn repair_node_settings(&self, index: &str, drifted_address: &str, drifted_node_id: &str) -> Result<()> {\n // Get correct settings from the first healthy node\n let first_address = self.config.node_addresses.first()\n .ok_or_else(|| MiroirError::Topology(\"no nodes configured\".into()))?;\n\n let url = format!(\"{}/indexes/{}/settings\", first_address.trim_end_matches('/'), index);\n let response = self.client\n .get(&url)\n .header(\"Authorization\", format!(\"Bearer {}\", self.config.node_master_key))\n .send()\n .await\n .map_err(|e| MiroirError::Task(format!(\"failed to fetch settings for repair: {}\", e)))?;\n\n if !response.status().is_success() {\n return Err(MiroirError::Task(format!(\n \"failed to fetch settings for repair: HTTP {}\",\n response.status()\n )));\n }\n\n let correct_settings: Value = response.json().await\n .map_err(|e| MiroirError::Task(format!(\"failed to parse settings for repair: {}\", e)))?;\n\n // PATCH the drifted node with correct settings\n let patch_url = format!(\"{}/indexes/{}/settings\", drifted_address.trim_end_matches('/'), index);\n let patch_response = self.client\n .patch(&patch_url)\n .header(\"Authorization\", format!(\"Bearer {}\", self.config.node_master_key))\n .json(&correct_settings)\n .send()\n .await\n .map_err(|e| MiroirError::Task(format!(\"failed to repair settings: {}\", e)))?;\n\n if !patch_response.status().is_success() {\n return Err(MiroirError::Task(format!(\n \"failed to repair settings: HTTP {}\",\n patch_response.status()\n )));\n }\n\n // Record metrics if callback is set\n if let Some(ref callback) = self.metrics_callback {\n callback(index, drifted_node_id);\n }\n\n Ok(())\n }\n\n /// Get node addresses with their IDs.\n fn node_addresses_with_ids(&self) -> Vec<(String, String)> {\n self.config.node_addresses\n .iter()\n .enumerate()\n .map(|(i, addr)| (format!(\"node-{}\", i), addr.clone()))\n .collect()\n }\n}\n\n/// Result of a drift check.\nenum DriftCheckResult {\n NoDrift,\n DriftDetected { mismatches: Vec<(String, String)> },\n Error(MiroirError),\n}\n\n/// Get current time in milliseconds since Unix epoch.\nfn now_ms() -> i64 {\n std::time::SystemTime::now()\n .duration_since(std::time::UNIX_EPOCH)\n .unwrap_or_default()\n .as_millis() as i64\n}\n\n#[cfg(test)]\nmod tests {\n use super::*;\n\n #[test]\n fn test_node_addresses_with_ids() {\n let config = DriftReconcilerConfig {\n interval_s: 300,\n auto_repair: true,\n node_master_key: \"test\".to_string(),\n node_addresses: vec![\n \"http://node1:7700\".to_string(),\n \"http://node2:7700\".to_string(),\n ],\n leader_scope: \"drift_reconciler\".to_string(),\n pod_id: \"pod-1\".to_string(),\n };\n\n let reconciler = DriftReconciler::new(\n config,\n Arc::new(crate::task_store::SqliteTaskStore::open_in_memory().unwrap()),\n );\n\n let addresses = reconciler.node_addresses_with_ids();\n assert_eq!(addresses.len(), 2);\n assert_eq!(addresses[0].0, \"node-0\");\n assert_eq!(addresses[0].1, \"http://node1:7700\");\n assert_eq!(addresses[1].0, \"node-1\");\n assert_eq!(addresses[1].1, \"http://node2:7700\");\n }\n}\n","numLines":392,"startLine":1,"totalLines":392}}} 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metrics_callback,\n...\n"}]},"parent_tool_use_id":null,"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","uuid":"b194a28a-982c-4130-853f-e75baac929dd","timestamp":"2026-05-23T06:48:56.755Z","tool_use_result":{"mode":"content","numFiles":0,"filenames":[],"content":"crates/miroir-core/src/tenant.rs:249: /// Record a query for metrics.\ncrates/miroir-core/src/task.rs:12: fn register(&self, node_tasks: HashMap) -> Result {\ncrates/miroir-core/src/task.rs:13: self.register_with_metadata(node_tasks, None, None)\ncrates/miroir-core/src/task.rs:17: fn register_with_metadata(\ncrates/miroir-core/src/task.rs:156: fn register_with_metadata(\ncrates/miroir-core/src/task.rs:207: fn stub_register_returns_enqueued_task() {\ncrates/miroir-core/src/task.rs:209: let task = stub.register(HashMap::new()).unwrap();\ncrates/miroir-core/src/rebalancer_worker/mod.rs:8://! - Updates Prometheus metrics (plan §10)\ncrates/miroir-core/src/rebalancer_worker/mod.rs:33:/// Callback type for recording rebalancer metrics.\ncrates/miroir-core/src/rebalancer_worker/mod.rs:213: metrics: Arc>,\ncrates/miroir-core/src/rebalancer_worker/mod.rs:221: /// Callback for recording Prometheus metrics.\ncrates/miroir-core/src/rebalancer_worker/mod.rs:222: metrics_callback: Option,\ncrates/miroir-core/src/rebalancer_worker/mod.rs:233: metrics: Arc>,\ncrates/miroir-core/src/rebalancer_worker/mod.rs:236: Self::with_metrics(config, topology, task_store, rebalancer, migration_coordinator, metrics, pod_id, None)\ncrates/miroir-core/src/rebalancer_worker/mod.rs:239: /// Create a new rebalancer worker with metrics callback.\ncrates/miroir-core/src/rebalancer_worker/mod.rs:240: pub fn with_metrics(\ncrates/miroir-core/src/rebalancer_worker/mod.rs:246: metrics: Arc>,\ncrates/miroir-core/src/rebalancer_worker/mod.rs:248: metrics_callback: Option,\ncrates/miroir-core/src/rebalancer_worker/mod.rs:259: metrics,\ncrates/miroir-core/src/rebalancer_worker/mod.rs:264: metrics_callback,\ncrates/miroir-core/src/rebalancer_worker/mod.rs:345: // We are the leader - update rebalancer metrics\ncrates/miroir-core/src/rebalancer_worker/mod.rs:347: let mut metrics = self.metrics.write().await;\ncrates/miroir-core/src/rebalancer_worker/mod.rs:348: metrics.start_rebalance();\ncrates/miroir-core/src/rebalancer_worker/mod.rs:351: // Call metrics callback for rebalance start\ncrates/miroir-core/src/rebalancer_worker/mod.rs:352: if let Some(ref callback) = self.metrics_callback {\ncrates/miroir-core/src/rebalancer_worker/mod.rs:363: let mut metrics = self.metrics.write().await;\ncrates/miroir-core/src/rebalancer_worker/mod.rs:364: metrics.end_rebalance();\ncrates/miroir-core/src/rebalancer_worker/mod.rs:367: // Call metrics callback for rebalance end\ncrates/miroir-core/src/rebalancer_worker/mod.rs:368: if let Some(ref callback) = self.metrics_callback {\ncrates/miroir-core/src/rebalancer_worker/mod.rs:894: /// Emit Prometheus metrics for the current rebalancer state.\ncrates/miroir-core/src/rebalancer_worker/mod.rs:895: pub async fn emit_metrics(&self) {\ncrates/miroir-core/src/rebalancer_worker/mod.rs:908: // Update internal metrics\ncrates/miroir-core/src/rebalancer_worker/mod.rs:910: let mut metrics = self.metrics.write().await;\ncrates/miroir-core/src/rebalancer_worker/mod.rs:912: metrics.start_rebalance();\ncrates/miroir-core/src/rebalancer_worker/mod.rs:914: metrics.end_rebalance();\ncrates/miroir-core/src/rebalancer_worker/mod.rs:921: // Call metrics callback for rebalance status\ncrates/miroir-core/src/rebalancer_worker/mod.rs:922: if let Some(ref callback) = self.metrics_callback {\ncrates/miroir-core/src/rebalancer_worker/mod.rs:1119: // Update metrics\ncrates/miroir-core/src/rebalancer_worker/mod.rs:1121: let mut metrics = self.metrics.write().await;\ncrates/miroir-core/src/rebalancer_worker/mod.rs:1122: metrics.record_documents_migrated(total_docs_migrated);\ncrates/miroir-core/src/rebalancer_worker/mod.rs:1125: // Call metrics callback for documents migrated\ncrates/miroir-core/src/rebalancer_worker/mod.rs:1126: if let Some(ref callback) = self.metrics_callback {\ncrates/miroir-core/src/rebalancer_worker/mod.rs:1141: let mut metrics = self.metrics.write().await;\ncrates/miroir-core/src/rebalancer_worker/mod.rs:1142: metrics.end_rebalance();\ncrates/miroir-core/src/rebalancer_worker/mod.rs:1150: // Call metrics callback for rebalance completion with duration\ncrates/miroir-core/src/rebalancer_worker/mod.rs:1151: if let Some(ref callback) = self.metrics_callback {\ncrates/miroir-core/src/rebalancer_worker/mod.rs:1461: // Update metrics\ncrates/miroir-core/src/rebalancer_worker/mod.rs:1463: let mut metrics = self.metrics.write().await;\ncrates/miroir-core/src/rebalancer_worker/mod.rs:1464: metrics.record_documents_migrated(total_docs_copied);\ncrates/miroir-core/src/rebalancer_worker/mod.rs:1467: // Call metrics callback for documents migrated\ncrates/miroir-core/src/rebalancer_worker/mod.rs:1468: if let Some(ref callback) = self.metrics_callback {\ncrates/miroir-core/src/rebalancer_worker/acceptance_tests.rs:295: let metrics = Arc::new(RwLock::new(RebalancerMetrics::default()));\ncrates/miroir-core/src/rebalancer_worker/acceptance_tests.rs:308: metrics.clone(),\ncrates/miroir-core/src/rebalancer_worker/acceptance_tests.rs:322: metrics.clone(),\ncrates/miroir-core/src/rebalancer_worker/acceptance_tests.rs:395: let metrics = Arc::new(RwLock::new(RebalancerMetrics::default()));\ncrates/miroir-core/src/rebalancer_worker/acceptance_tests.rs:454: metrics,\ncrates/miroir-core/src/rebalancer_worker/acceptance_tests.rs:480:async fn p4_1_a3_metrics_monotonically_increase() {\ncrates/miroir-core/src/rebalancer_worker/acceptance_tests.rs:481: let metrics = Arc::new(RwLock::new(RebalancerMetrics::default()));\ncrates/miroir-core/src/rebalancer_worker/acceptance_tests.rs:485: let mut m = metrics.write().await;\ncrates/miroir-core/src/rebalancer_worker/acceptance_tests.rs:491: let mut m = metrics.write().await;\ncrates/miroir-core/src/rebalancer_worker/acceptance_tests.rs:498: let m = metrics.read().await;\ncrates/miroir-core/src/rebalancer_worker/acceptance_tests.rs:504: let mut m = metrics.write().await;\ncrates/miroir-core/src/rebalancer_worker/acceptance_tests.rs:530: let metrics = Arc::new(RwLock::new(RebalancerMetrics::default()));\ncrates/miroir-core/src/rebalancer_worker/acceptance_tests.rs:546: metrics.clone(),\ncrates/miroir-core/src/rebalancer_worker/acceptance_tests.rs:560: metrics.clone(),\ncrates/miroir-core/src/raft_proto/mod.rs:82: fn register_with_metadata(\ncrates/miroir-core/src/raft_proto/mod.rs:151: let task = reg.register(node_tasks).unwrap();\ncrates/miroir-core/src/raft_proto/mod.rs:163: let task = reg.register(node_tasks).unwrap();\ncrates/miroir-core/src/raft_proto/mod.rs:179: reg.register(node_tasks).unwrap();\ncrates/miroir-core/src/raft_proto/mod.rs:201: let task = reg.register(node_tasks).unwrap();\ncrates/miroir-core/src/replica_selection.rs:4://! metrics: latency p95, in-flight request count, and error rate.\ncrates/miroir-core/src/replica_selection.rs:85:/// Per-node metrics for adaptive selection.\ncrates/miroir-core/src/replica_selection.rs:101: /// Create new metrics with initial values.\ncrates/miroir-core/src/replica_selection.rs:155: /// Per-node metrics.\ncrates/miroir-core/src/replica_selection.rs:156: metrics: Arc>>,\ncrates/miroir-core/src/replica_selection.rs:168: metrics: Arc::new(RwLock::new(HashMap::new())),\ncrates/miroir-core/src/replica_selection.rs:193: let metrics = self.metrics.read().await;\ncrates/miroir-core/src/replica_selection.rs:205: let score = metrics\ncrates/miroir-core/src/replica_selection.rs:249: let mut metrics = self.metrics.write().await;\ncrates/miroir-core/src/replica_selection.rs:250: let entry = metrics\ncrates/miroir-core/src/replica_selection.rs:260: let mut metrics = self.metrics.write().await;\ncrates/miroir-core/src/replica_selection.rs:261: let entry = metrics\ncrates/miroir-core/src/replica_selection.rs:273: let mut metrics = self.metrics.write().await;\ncrates/miroir-core/src/replica_selection.rs:274: let entry = metrics\ncrates/miroir-core/src/replica_selection.rs:280: /// Get metrics for a node.\ncrates/miroir-core/src/replica_selection.rs:281: pub async fn get_metrics(&self, node: &NodeId) -> Option {\ncrates/miroir-core/src/replica_selection.rs:282: let metrics = self.metrics.read().await;\ncrates/miroir-core/src/replica_selection.rs:283: metrics.get(node).cloned()\ncrates/miroir-core/src/replica_selection.rs:316: fn test_node_metrics_score() {\ncrates/miroir-core/src/replica_selection.rs:317: let mut metrics = NodeMetrics::new(50.0, 5000);\ncrates/miroir-core/src/replica_selection.rs:318: assert_eq!(metrics.score(&ReplicaSelectionConfig::default()), 50.0);\ncrates/miroir-core/src/replica_selection.rs:320: metrics.in_flight = 5;\ncrates/miroir-core/src/replica_selection.rs:321: let score = metrics.score(&ReplicaSelectionConfig::default());\ncrates/miroir-core/src/replica_selection.rs:327: fn test_node_metrics_ewma() {\ncrates/miroir-core/src/replica_selection.rs:328: let mut metrics = NodeMetrics::new(100.0, 1000); // Short half-life\ncrates/miroir-core/src/replica_selection.rs:330: metrics.update_latency(50.0);\ncrates/miroir-core/src/replica_selection.rs:332: assert!(metrics.latency_p95_ms < 100.0 && metrics.latency_p95_ms > 40.0);\ncrates/miroir-core/src/replica_selection.rs:334: metrics.update_error(true);\ncrates/miroir-core/src/replica_selection.rs:335: assert!(metrics.error_rate > 0.0);\ncrates/miroir-core/src/replica_selection.rs:337: metrics.update_error(false);\ncrates/miroir-core/src/replica_selection.rs:339: let rate_before = metrics.error_rate;\ncrates/miroir-core/src/replica_selection.rs:340: metrics.update_error(false);\ncrates/miroir-core/src/replica_selection.rs:341: assert!(metrics.error_rate < rate_before);\ncrates/miroir-core/src/replica_selection.rs:351: // Record some metrics\ncrates/miroir-core/src/replica_selection.rs:353: let mut metrics = selector.metrics.write().await;\ncrates/miroir-core/src/replica_selection.rs:354: metrics.insert(\ncrates/miroir-core/src/replica_selection.rs:364: metrics.insert(\ncrates/miroir-core/src/replica_selection.rs:415: let metrics = selector.get_metrics(&node).await;\ncrates/miroir-core/src/replica_selection.rs:416: assert!(metrics.is_some());\ncrates/miroir-core/src/replica_selection.rs:417: assert_eq!(metrics.unwrap().in_flight, 1);\ncrates/miroir-core/src/replica_selection.rs:421: let metrics = selector.get_metrics(&node).await;\ncrates/miroir-core/src/replica_selection.rs:422: assert!(metrics.is_some());\ncrates/miroir-core/src/replica_selection.rs:423: assert_eq!(metrics.unwrap().in_flight, 0);\ncrates/miroir-core/src/alias/acceptance_tests.rs:200:async fn list_aliases_returns_all_registered() {\ncrates/miroir-core/src/reshard.rs:850: pub fn register(&mut self, op: ReshardOperation) -> Result<(), String> {\ncrates/miroir-core/src/reshard.rs:982: reg.register(op1).unwrap();\ncrates/miroir-core/src/reshard.rs:984: assert!(reg.register(op2).is_err());\ncrates/miroir-core/src/reshard.rs:992: reg.register(op).unwrap();\ncrates/miroir-core/src/reshard.rs:1002: reg.register(op).unwrap();\ncrates/miroir-core/src/reshard.rs:1017: reg.register(op).unwrap();\ncrates/miroir-core/src/ilm.rs:150: pub async fn register_policy(&self, policy: RolloverPolicy) -> Result<(), IlmError> {\ncrates/miroir-core/src/ilm.rs:156: /// Unregister a policy.\ncrates/miroir-core/src/ilm.rs:157: pub async fn unregister_policy(&self, name: &str) -> Result<(), IlmError> {\ncrates/miroir-core/src/ilm.rs:335: async fn test_register_policy() {\ncrates/miroir-core/src/ilm.rs:358: assert!(manager.register_policy(policy).await.is_ok());\ncrates/miroir-core/src/ilm.rs:365: async fn test_unregister_policy() {\ncrates/miroir-core/src/ilm.rs:388: manager.register_policy(policy).await.unwrap();\ncrates/miroir-core/src/ilm.rs:391: manager.unregister_policy(\"test-policy\").await.unwrap();\ncrates/miroir-core/src/ilm.rs:419: manager.register_policy(policy).await.unwrap();\ncrates/miroir-core/src/hedging.rs:204:/// Hedge outcome for metrics.\ncrates/miroir-core/src/migration.rs:417: pub fn register_in_flight(&mut self, write: InFlightWrite) {\ncrates/miroir-core/src/migration.rs:697: coord.register_in_flight(InFlightWrite {\ncrates/miroir-core/src/migration.rs:788: coord.register_in_flight(InFlightWrite {\ncrates/miroir-core/src/migration.rs:855: coord.register_in_flight(InFlightWrite {\ncrates/miroir-core/src/drift_reconciler.rs:20:/// Callback type for recording drift repair metrics.\ncrates/miroir-core/src/drift_reconciler.rs:47: /// Callback for recording drift repair metrics.\ncrates/miroir-core/src/drift_reconciler.rs:48: metrics_callback: Option,\ncrates/miroir-core/src/drift_reconciler.rs:57: Self::with_metrics(config, task_store, None)\ncrates/miroir-core/src/drift_reconciler.rs:60: /// Create a new drift reconciler with metrics callback.\ncrates/miroir-core/src/drift_reconciler.rs:61: pub fn with_metrics(\ncrates/miroir-core/src/drift_reconciler.rs:64: metrics_callback: Option,\ncrates/miroir-core/src/drift_reconciler.rs:76: metrics_callback,\ncrates/miroir-core/src/drift_reconciler.rs:328: // Record metrics if callback is set\ncrates/miroir-core/src/drift_reconciler.rs:329: if let Some(ref callback) = self.metrics_callback {\ncrates/miroir-core/src/session_pinning.rs:378: pub fn update_metrics(&self, active_count_fn: impl FnOnce(usize)) {\ncrates/miroir-core/src/idempotency.rs:169: pub async fn register(\ncrates/miroir-core/src/idempotency.rs:188: /// Unregister a pending query after completion.\ncrates/miroir-core/src/idempotency.rs:189: pub async fn unregister(&self, fingerprint: &QueryFingerprint) {\ncrates/miroir-core/src/idempotency.rs:283: async fn test_coalescer_miss_then_register() {\ncrates/miroir-core/src/idempotency.rs:295: let _tx = coalescer.register(fp.clone()).await.unwrap();\ncrates/miroir-core/src/idempotency.rs:299: coalescer.unregister(&fp).await;\ncrates/miroir-core/src/idempotency.rs:313: let tx = coalescer.register(fp.clone()).await.unwrap();\ncrates/miroir-core/src/task_store/sqlite.rs:1830: index_uid: \"metrics\".to_string(),\ncrates/miroir-core/src/canary.rs:106: metrics_emitter: MetricsEmitter,\ncrates/miroir-core/src/canary.rs:116: metrics_emitter: MetricsEmitter,\ncrates/miroir-core/src/canary.rs:125: metrics_emitter,\ncrates/miroir-core/src/canary.rs:263: // Emit metrics\ncrates/miroir-core/src/canary.rs:264: self.emit_metrics(&result);\ncrates/miroir-core/src/canary.rs:373: /// Emit metrics for a canary run\ncrates/miroir-core/src/canary.rs:374: fn emit_metrics(&self, result: &CanaryRunResult) {\ncrates/miroir-core/src/canary.rs:375: // Call the metrics emitter callback\ncrates/miroir-core/src/canary.rs:376: (self.metrics_emitter)(result);\ncrates/miroir-core/src/canary.rs:412: metrics_emitter: self.metrics_emitter.clone(),\ncrates/miroir-core/src/task_registry.rs:76: pub async fn register_async(&self, node_tasks: HashMap) -> Result {\ncrates/miroir-core/src/task_registry.rs:77: self.register_async_with_metadata(node_tasks, None, None).await\ncrates/miroir-core/src/task_registry.rs:81: pub async fn register_async_with_metadata(\ncrates/miroir-core/src/task_registry.rs:133: pub async fn register_with_poller(\ncrates/miroir-core/src/task_registry.rs:497: fn register_with_metadata(\ncrates/miroir-core/src/task_registry.rs:508: registry.register_async_with_metadata(node_tasks, index_uid, task_type).await\ncrates/miroir-core/src/task_registry.rs:725: pub fn register_with_metadata(\ncrates/miroir-core/src/task_registry.rs:733: crate::task::TaskRegistry::register_with_metadata(\ncrates/miroir-core/src/task_registry.rs:1054: fn register_with_metadata(\ncrates/miroir-core/src/task_registry.rs:1060: TaskRegistryImpl::register_with_metadata(self, node_tasks, index_uid, task_type)\ncrates/miroir-core/src/task_registry.rs:1093: fn test_in_memory_register_creates_task() {\ncrates/miroir-core/src/task_registry.rs:1101: registry.register_async(node_tasks).await\ncrates/miroir-core/src/task_registry.rs:1116: registry.register_async(node_tasks).await\ncrates/miroir-core/src/task_registry.rs:1134: let t1 = registry.register_async(node_tasks.clone()).await.unwrap();\ncrates/miroir-core/src/task_registry.rs:1135: let t2 = registry.register_async(node_tasks).await.unwrap();\ncrates/miroir-core/src/task_registry.rs:1172: registry.register_async(node_tasks).await\ncrates/miroir-core/src/task_registry.rs:1201: registry.register_async(node_tasks).await\ncrates/miroir-core/src/task_registry.rs:1239: registry.register_async_with_metadata(\ncrates/miroir-core/src/task_registry.rs:1246: registry.register_async_with_metadata(\ncrates/miroir-core/src/task_registry.rs:1279: registry.register_async_with_metadata(\ncrates/miroir-core/src/task_registry.rs:1286: registry.register_async_with_metadata(\ncrates/miroir-core/src/task_registry.rs:1320: registry.register_async(node_tasks).await\ncrates/miroir-core/src/task_registry.rs:1343: registry.register_async(node_tasks).await\ncrates/miroir-core/src/task_registry.rs:1362: registry.register_async_with_metadata(\ncrates/miroir-core/src/task_registry.rs:1369: registry.register_async_with_metadata(\ncrates/miroir-core/src/cdc.rs:159: Self::with_metrics(config, None)\ncrates/miroir-core/src/cdc.rs:163: pub fn with_metrics(config: CdcConfig, suppressed_metric_callback: Option) -> Self {\ncrates/miroir-core/src/cdc.rs:446: let manager = CdcManager::with_metrics(config, Some(callback));\ncrates/miroir-core/src/cdc.rs:483: let manager = CdcManager::with_metrics(config, Some(callback));\ncrates/miroir-core/src/cdc.rs:527: let manager = CdcManager::with_metrics(config, Some(callback));\ncrates/miroir-core/src/cdc.rs:565: let manager = CdcManager::with_metrics(config, Some(callback));\ncrates/miroir-core/src/task_store/redis.rs:2197: pub fn register_pod_presence(&self, pod_id: &str) -> Result<()> {\ncrates/miroir-core/src/task_store/redis.rs:2215: /// Get the list of pods that have registered presence within the last 120 seconds.\ncrates/miroir-core/src/task_store/redis.rs:3467: index_uid: \"metrics\".to_string(),\ncrates/miroir-core/src/rebalancer.rs:24:/// Callback type for recording rebalancer metrics.\ncrates/miroir-core/src/rebalancer.rs:278:/// Rebalancer metrics for Prometheus emission.\ncrates/miroir-core/src/rebalancer.rs:336: pub metrics: Arc>,\ncrates/miroir-core/src/rebalancer.rs:343: /// Callback for recording Prometheus metrics.\ncrates/miroir-core/src/rebalancer.rs:344: metrics_callback: Option,\ncrates/miroir-core/src/rebalancer.rs:364: metrics: Arc::new(RwLock::new(RebalancerMetrics::default())),\ncrates/miroir-core/src/rebalancer.rs:368: metrics_callback: None,\ncrates/miroir-core/src/rebalancer.rs:390: /// Set the metrics callback for Prometheus emission.\ncrates/miroir-core/src/rebalancer.rs:391: pub fn with_metrics_callback(mut self, callback: RebalancerMetricsCallback) -> Self {\ncrates/miroir-core/src/rebalancer.rs:392: self.metrics_callback = Some(callback);\ncrates/miroir-core/src/rebalancer.rs:402: /// Emit a metric via the metrics callback (if configured).\ncrates/miroir-core/src/rebalancer.rs:404: if let Some(ref callback) = self.metrics_callback {\ncrates/miroir-core/src/rebalancer.rs:702: // Start metrics tracking\ncrates/miroir-core/src/rebalancer.rs:704: let mut metrics = self.metrics.write().await;\ncrates/miroir-core/src/rebalancer.rs:705: metrics.start_rebalance();\ncrates/miroir-core/src/rebalancer.rs:715: let metrics_arc = self.metrics.clone();\ncrates/miroir-core/src/rebalancer.rs:727: metrics_arc,\ncrates/miroir-core/src/rebalancer.rs:835: // Start metrics tracking\ncrates/miroir-core/src/rebalancer.rs:837: let mut metrics = self.metrics.write().await;\ncrates/miroir-core/src/rebalancer.rs:838: metrics.start_rebalance();\ncrates/miroir-core/src/rebalancer.rs:850: let metrics_arc = self.metrics.clone();\ncrates/miroir-core/src/rebalancer.rs:863: metrics_arc,\ncrates/miroir-core/src/rebalancer.rs:1275: metrics: Arc>,\ncrates/miroir-core/src/rebalancer.rs:1302: // Record metrics for simulated migration\ncrates/miroir-core/src/rebalancer.rs:1304: let mut metrics_guard = metrics.write().await;\ncrates/miroir-core/src/rebalancer.rs:1305: metrics_guard.record_documents_migrated(docs_per_shard * shards_to_complete.len() as u64);\ncrates/miroir-core/src/rebalancer.rs:1460: // Record metrics for this migration\ncrates/miroir-core/src/rebalancer.rs:1462: let mut metrics_guard = metrics.write().await;\ncrates/miroir-core/src/rebalancer.rs:1463: metrics_guard.record_documents_migrated(migration_total_docs);\ncrates/miroir-core/src/rebalancer.rs:1576: metrics: Arc>,\ncrates/miroir-core/src/rebalancer.rs:1603: // Record metrics for simulated migration\ncrates/miroir-core/src/rebalancer.rs:1605: let mut metrics_guard = metrics.write().await;\ncrates/miroir-core/src/rebalancer.rs:1606: metrics_guard.record_documents_migrated(docs_per_shard * shards_to_complete.len() as u64);","numLines":230}} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_954270e5d60d41cb8b00d751","type":"tool_result","content":"1\t//! Rebalancer background worker with advisory lock.\n2\t//!\n3\t//! Implements plan §4 \"Rebalancer\" background task:\n4\t//! - Advisory lock via leader_lease (only one pod runs the rebalancer)\n5\t//! - Reacts to topology change events (node add/drain/fail/recover)\n6\t//! - Computes affected shards using the Phase 1 router\n7\t//! - Drives the migration state machine for each affected shard\n8\t//! - Updates Prometheus metrics (plan §10)\n9\t//! - Progress persistence via jobs table for resumability\n10\t\n11\tmod drift_reconciler;\n12\t\n13\t#[cfg(test)]\n14\tmod acceptance_tests;\n15\t\n16\t#[cfg(test)]\n17\tmod settings_broadcast_acceptance_tests;\n18\t\n19\tpub use drift_reconciler::{DriftReconciler, DriftReconcilerConfig};\n20\t\n21\tuse crate::migration::{MigrationCoordinator, MigrationId, MigrationNodeId, ShardId};\n22\tuse crate::rebalancer::{MigrationExecutor, Rebalancer, RebalancerMetrics};\n23\tuse crate::router::assign_shard_in_group;\n24\tuse crate::task_store::{NewJob, TaskStore};\n25\tuse crate::topology::{NodeId as TopologyNodeId, Topology};\n26\tuse serde::{Deserialize, Serialize};\n27\tuse std::collections::HashMap;\n28\tuse std::sync::Arc;\n29\tuse std::time::{Duration, Instant};\n30\tuse tokio::sync::{mpsc, RwLock};\n31\tuse tracing::{debug, error, info};\n32\t\n33\t/// Callback type for recording rebalancer metrics.\n34\t///\n35\t/// Called when:\n36\t/// - Documents are migrated (count)\n37\t/// - Rebalance starts (in_progress = true)\n38\t/// - Rebalance ends (in_progress = false, duration_secs)\n39\tpub type RebalancerMetricsCallback = Arc, Option) + Send + Sync>;\n40\t\n41\t/// Default leader lease TTL in seconds.\n42\tconst LEASE_TTL_SECS: u64 = 10;\n43\t\n44\t/// Default interval for lease renewal checks.\n45\tconst LEASE_RENEWAL_INTERVAL_MS: u64 = 2000;\n46\t\n47\t/// Maximum time to wait for a migration job to complete.\n48\tconst MIGRATION_TIMEOUT_SECS: u64 = 3600;\n49\t\n50\t/// Unique identifier for a rebalance job (per index).\n51\t#[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]\n52\tpub struct RebalanceJobId(pub String);\n53\t\n54\timpl RebalanceJobId {\n55\t /// Create a new rebalance job ID for an index.\n56\t pub fn new(index_uid: &str) -> Self {\n57\t Self(format!(\"rebalance:{}\", index_uid))\n58\t }\n59\t\n60\t /// Get the index UID from the job ID.\n61\t pub fn index_uid(&self) -> &str {\n62\t self.0.strip_prefix(\"rebalance:\").unwrap_or(&self.0)\n63\t }\n64\t}\n65\t\n66\t/// Topology change event that triggers rebalancing.\n67\t#[derive(Debug, Clone, Serialize, Deserialize)]\n68\tpub enum TopologyChangeEvent {\n69\t /// A new node was added to a replica group.\n70\t NodeAdded {\n71\t node_id: String,\n72\t replica_group: u32,\n73\t index_uid: String,\n74\t },\n75\t /// A node is being drained (preparing for removal).\n76\t NodeDraining {\n77\t node_id: String,\n78\t replica_group: u32,\n79\t index_uid: String,\n80\t },\n81\t /// A node failed and needs recovery.\n82\t NodeFailed {\n83\t node_id: String,\n84\t replica_group: u32,\n85\t index_uid: String,\n86\t },\n87\t /// A node recovered after failure.\n88\t NodeRecovered {\n89\t node_id: String,\n90\t replica_group: u32,\n91\t index_uid: String,\n92\t },\n93\t}\n94\t\n95\t/// Per-shard migration progress for persistence.\n96\t#[derive(Debug, Clone, Serialize, Deserialize)]\n97\tpub struct ShardMigrationProgress {\n98\t /// Shard ID.\n99\t pub shard_id: u32,\n100\t /// Current phase.\n101\t pub phase: String,\n102\t /// Documents migrated so far.\n103\t pub docs_migrated: u64,\n104\t /// Last offset for pagination resume.\n105\t pub last_offset: u32,\n106\t /// Source node for migration.\n107\t pub source_node: Option,\n108\t /// Target node for migration.\n109\t pub target_node: String,\n110\t}\n111\t\n112\t/// Per-shard migration state for the worker.\n113\t#[derive(Debug, Clone, Serialize, Deserialize)]\n114\tstruct ShardState {\n115\t /// Current phase.\n116\t phase: ShardMigrationPhase,\n117\t /// Documents migrated so far.\n118\t docs_migrated: u64,\n119\t /// Last offset for pagination resume.\n120\t last_offset: u32,\n121\t /// Source node for migration.\n122\t source_node: Option,\n123\t /// Target node for migration.\n124\t target_node: String,\n125\t /// When this shard migration started.\n126\t #[serde(skip, default = \"Instant::now\")]\n127\t started_at: Instant,\n128\t}\n129\t\n130\t/// Migration phases for a single shard.\n131\t#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]\n132\tpub enum ShardMigrationPhase {\n133\t /// Waiting to start.\n134\t Idle,\n135\t /// Dual-write active.\n136\t DualWriteStarted,\n137\t /// Background migration in progress.\n138\t MigrationInProgress,\n139\t /// Migration complete, preparing cutover.\n140\t MigrationComplete,\n141\t /// Dual-write stopped.\n142\t DualWriteStopped,\n143\t /// Old replica deleted.\n144\t OldReplicaDeleted,\n145\t /// Migration failed.\n146\t Failed,\n147\t}\n148\t\n149\t/// State machine for a rebalance job (per index).\n150\t#[derive(Debug, Clone, Serialize, Deserialize)]\n151\tstruct RebalanceJob {\n152\t /// Job ID.\n153\t id: RebalanceJobId,\n154\t /// Index UID being rebalanced.\n155\t index_uid: String,\n156\t /// Replica group being rebalanced.\n157\t replica_group: u32,\n158\t /// Per-shard migration state.\n159\t shards: HashMap,\n160\t /// Job started at.\n161\t #[serde(skip, default = \"Instant::now\")]\n162\t started_at: Instant,\n163\t /// Job completed at (if finished).\n164\t #[serde(skip, default)]\n165\t completed_at: Option,\n166\t /// Total documents migrated.\n167\t total_docs_migrated: u64,\n168\t /// Whether the job is paused.\n169\t paused: bool,\n170\t}\n171\t\n172\t/// Configuration for the rebalancer worker.\n173\t#[derive(Debug, Clone, Serialize, Deserialize)]\n174\tpub struct RebalancerWorkerConfig {\n175\t /// Maximum concurrent migrations (plan §14.2 memory budget).\n176\t pub max_concurrent_migrations: u32,\n177\t /// Leader lease TTL in seconds.\n178\t pub lease_ttl_secs: u64,\n179\t /// Lease renewal interval in milliseconds.\n180\t pub lease_renewal_interval_ms: u64,\n181\t /// Migration batch size.\n182\t pub migration_batch_size: u32,\n183\t /// Delay between migration batches (ms).\n184\t pub migration_batch_delay_ms: u64,\n185\t /// Channel capacity for topology events.\n186\t pub event_channel_capacity: usize,\n187\t}\n188\t\n189\timpl Default for RebalancerWorkerConfig {\n190\t fn default() -> Self {\n191\t Self {\n192\t max_concurrent_migrations: 4,\n193\t lease_ttl_secs: LEASE_TTL_SECS,\n194\t lease_renewal_interval_ms: LEASE_RENEWAL_INTERVAL_MS,\n195\t migration_batch_size: 1000,\n196\t migration_batch_delay_ms: 100,\n197\t event_channel_capacity: 100,\n198\t }\n199\t }\n200\t}\n201\t\n202\t/// The rebalancer background worker.\n203\t///\n204\t/// Runs as a Tokio task, acquires a leader lease, and processes topology\n205\t/// change events to drive shard migrations.\n206\tpub struct RebalancerWorker {\n207\t config: RebalancerWorkerConfig,\n208\t topology: Arc>,\n209\t task_store: Arc,\n210\t _rebalancer: Arc, // Reserved for future use\n211\t migration_coordinator: Arc>,\n212\t migration_executor: Option>,\n213\t metrics: Arc>,\n214\t pod_id: String,\n215\t /// Sender for topology change events.\n216\t event_tx: mpsc::Sender,\n217\t /// Active rebalance jobs (per index).\n218\t jobs: Arc>>,\n219\t /// Receiver for topology change events (cloned for internal use).\n220\t event_rx: Arc>>>,\n221\t /// Callback for recording Prometheus metrics.\n222\t metrics_callback: Option,\n223\t}\n224\t\n225\timpl RebalancerWorker {\n226\t /// Create a new rebalancer worker.\n227\t pub fn new(\n228\t config: RebalancerWorkerConfig,\n229\t topology: Arc>,\n230\t task_store: Arc,\n231\t rebalancer: Arc, // Reserved for future use\n232\t migration_coordinator: Arc>,\n233\t metrics: Arc>,\n234\t pod_id: String,\n235\t ) -> Self {\n236\t Self::with_metrics(config, topology, task_store, rebalancer, migration_coordinator, metrics, pod_id, None)\n237\t }\n238\t\n239\t /// Create a new rebalancer worker with metrics callback.\n240\t pub fn with_metrics(\n241\t config: RebalancerWorkerConfig,\n242\t topology: Arc>,\n243\t task_store: Arc,\n244\t rebalancer: Arc, // Reserved for future use\n245\t migration_coordinator: Arc>,\n246\t metrics: Arc>,\n247\t pod_id: String,\n248\t metrics_callback: Option,\n249\t ) -> Self {\n250\t let (event_tx, event_rx) = mpsc::channel(config.event_channel_capacity);\n251\t\n252\t Self {\n253\t config,\n254\t topology,\n255\t task_store,\n256\t _rebalancer: rebalancer, // Stored but not currently used\n257\t migration_coordinator,\n258\t migration_executor: None, // Set via with_migration_executor\n259\t metrics,\n260\t pod_id,\n261\t event_tx,\n262\t jobs: Arc::new(RwLock::new(HashMap::new())),\n263\t event_rx: Arc::new(RwLock::new(Some(event_rx))),\n264\t metrics_callback,\n265\t }\n266\t }\n267\t\n268\t /// Set the migration executor (provides HTTP client for actual migrations).\n269\t pub fn with_migration_executor(mut self, executor: Arc) -> Self {\n270\t self.migration_executor = Some(executor);\n271\t self\n272\t }\n273\t\n274\t /// Get a sender for topology change events.\n275\t pub fn event_sender(&self) -> mpsc::Sender {\n276\t self.event_tx.clone()\n277\t }\n278\t\n279\t /// Start the background worker.\n280\t ///\n281\t /// This runs in a loop:\n282\t /// 1. Try to acquire leader lease for each index (scope: rebalance:)\n283\t /// 2. If acquired, process events and run migrations\n284\t /// 3. Renew lease periodically\n285\t /// 4. If lease lost, go back to step 1\n286\t pub async fn run(&self) {\n287\t info!(\n288\t pod_id = %self.pod_id,\n289\t \"rebalancer worker starting\"\n290\t );\n291\t\n292\t loop {\n293\t // Try to acquire leader lease for each index we're managing\n294\t let mut leader_scopes = Vec::new();\n295\t\n296\t // Get all active indexes from current jobs and use default scope\n297\t let jobs = self.jobs.read().await;\n298\t let mut index_uids: Vec = jobs.values()\n299\t .map(|j| j.index_uid.clone())\n300\t .collect();\n301\t\n302\t // Always include \"default\" scope for rebalancer operations\n303\t index_uids.push(\"default\".to_string());\n304\t drop(jobs);\n305\t\n306\t // Build scopes for each index: rebalance:\n307\t let scopes: Vec = index_uids\n308\t .into_iter()\n309\t .map(|uid| format!(\"rebalance:{}\", uid))\n310\t .collect();\n311\t\n312\t let mut acquired_any = false;\n313\t for scope in &scopes {\n314\t let now_ms = now_ms();\n315\t let expires_at = now_ms + (self.config.lease_ttl_secs * 1000) as i64;\n316\t\n317\t match tokio::task::spawn_blocking({\n318\t let task_store = self.task_store.clone();\n319\t let scope = scope.clone();\n320\t let pod_id = self.pod_id.clone();\n321\t move || {\n322\t task_store.try_acquire_leader_lease(&scope, &pod_id, expires_at, now_ms)\n323\t }\n324\t })\n325\t .await\n326\t {\n327\t Ok(Ok(true)) => {\n328\t info!(scope = %scope, pod_id = %self.pod_id, \"acquired leader lease\");\n329\t leader_scopes.push(scope.clone());\n330\t acquired_any = true;\n331\t }\n332\t Ok(Ok(false)) => {\n333\t debug!(scope = %scope, \"leader lease already held\");\n334\t }\n335\t Ok(Err(e)) => {\n336\t error!(scope = %scope, error = %e, \"failed to acquire leader lease\");\n337\t }\n338\t Err(e) => {\n339\t error!(scope = %scope, error = %e, \"spawn_blocking task failed\");\n340\t }\n341\t }\n342\t }\n343\t\n344\t if acquired_any {\n345\t // We are the leader - update rebalancer metrics\n346\t {\n347\t let mut metrics = self.metrics.write().await;\n348\t metrics.start_rebalance();\n349\t }\n350\t\n351\t // Call metrics callback for rebalance start\n352\t if let Some(ref callback) = self.metrics_callback {\n353\t callback(true, None, None);\n354\t }\n355\t\n356\t // We are the leader - run the main loop\n357\t if let Err(e) = self.run_leader_loop(&leader_scopes).await {\n358\t error!(error = %e, \"leader loop failed\");\n359\t }\n360\t\n361\t // Clear rebalancer in-progress status on exit\n362\t {\n363\t let mut metrics = self.metrics.write().await;\n364\t metrics.end_rebalance();\n365\t }\n366\t\n367\t // Call metrics callback for rebalance end\n368\t if let Some(ref callback) = self.metrics_callback {\n369\t callback(false, None, None);\n370\t }\n371\t } else {\n372\t // Not the leader - wait before retrying\n373\t tokio::time::sleep(Duration::from_millis(\n374\t self.config.lease_renewal_interval_ms,\n375\t ))\n376\t .await;\n377\t }\n378\t }\n379\t }\n380\t\n381\t /// Run the leader loop: process events, renew lease, drive migrations.\n382\t async fn run_leader_loop(&self, scopes: &[String]) -> Result<(), String> {\n383\t let mut lease_renewal = tokio::time::interval(Duration::from_millis(\n384\t self.config.lease_renewal_interval_ms,\n385\t ));\n386\t\n387\t // Take the receiver out of the Option\n388\t let mut event_rx = {\n389\t let mut rx_guard = self.event_rx.write().await;\n390\t rx_guard.take().ok_or_else(|| \"event receiver already taken\".to_string())?\n391\t };\n392\t\n393\t let result = async {\n394\t loop {\n395\t tokio::select! {\n396\t // Renew lease periodically\n397\t _ = lease_renewal.tick() => {\n398\t for scope in scopes {\n399\t let now_ms = now_ms();\n400\t let expires_at = now_ms + (self.config.lease_ttl_secs * 1000) as i64;\n401\t\n402\t match tokio::task::spawn_blocking({\n403\t let task_store = self.task_store.clone();\n404\t let scope = scope.clone();\n405\t let pod_id = self.pod_id.clone();\n406\t move || {\n407\t task_store.renew_leader_lease(&scope, &pod_id, expires_at)\n408\t }\n409\t })\n410\t .await\n411\t {\n412\t Ok(Ok(true)) => {\n413\t debug!(scope = %scope, \"renewed leader lease\");\n414\t }\n415\t Ok(Ok(false)) => {\n416\t info!(scope = %scope, \"lost leader lease\");\n417\t return Ok::<(), String>(()); // Exit loop, will retry acquisition\n418\t }\n419\t Ok(Err(e)) => {\n420\t error!(scope = %scope, error = %e, \"failed to renew lease\");\n421\t return Err(format!(\"lease renewal failed: {}\", e));\n422\t }\n423\t Err(e) => {\n424\t error!(scope = %scope, error = %e, \"spawn_blocking task failed\");\n425\t return Err(format!(\"lease renewal task failed: {}\", e));\n426\t }\n427\t }\n428\t }\n429\t }\n430\t\n431\t // Process topology change events\n432\t Some(event) = event_rx.recv() => {\n433\t if let Err(e) = self.handle_topology_event(event).await {\n434\t error!(error = %e, \"failed to handle topology event\");\n435\t }\n436\t }\n437\t\n438\t // Drive active migrations\n439\t _ = tokio::time::sleep(Duration::from_millis(100)) => {\n440\t if let Err(e) = self.drive_migrations().await {\n441\t error!(error = %e, \"failed to drive migrations\");\n442\t }\n443\t }\n444\t }\n445\t }\n446\t }.await;\n447\t\n448\t // Put the receiver back for retry logic\n449\t {\n450\t let mut rx_guard = self.event_rx.write().await;\n451\t if rx_guard.is_none() {\n452\t *rx_guard = Some(event_rx);\n453\t }\n454\t }\n455\t\n456\t result\n457\t }\n458\t\n459\t /// Handle a topology change event.\n460\t async fn handle_topology_event(&self, event: TopologyChangeEvent) -> Result<(), String> {\n461\t info!(event = ?event, \"handling topology change event\");\n462\t\n463\t match event {\n464\t TopologyChangeEvent::NodeAdded {\n465\t node_id,\n466\t replica_group,\n467\t index_uid,\n468\t } => {\n469\t self.on_node_added(&node_id, replica_group, &index_uid)\n470\t .await?\n471\t }\n472\t TopologyChangeEvent::NodeDraining {\n473\t node_id,\n474\t replica_group,\n475\t index_uid,\n476\t } => {\n477\t self.on_node_draining(&node_id, replica_group, &index_uid)\n478\t .await?\n479\t }\n480\t TopologyChangeEvent::NodeFailed {\n481\t node_id,\n482\t replica_group,\n483\t index_uid,\n484\t } => {\n485\t self.on_node_failed(&node_id, replica_group, &index_uid)\n486\t .await?\n487\t }\n488\t TopologyChangeEvent::NodeRecovered {\n489\t node_id,\n490\t replica_group,\n491\t index_uid,\n492\t } => {\n493\t self.on_node_recovered(&node_id, replica_group, &index_uid)\n494\t .await?\n495\t }\n496\t }\n497\t\n498\t Ok(())\n499\t }\n500\t\n501\t /// Handle node addition: compute affected shards and create job to track migration.\n502\t async fn on_node_added(\n503\t &self,\n504\t node_id: &str,\n505\t replica_group: u32,\n506\t index_uid: &str,\n507\t ) -> Result<(), String> {\n508\t let job_id = RebalanceJobId::new(index_uid);\n509\t\n510\t // Check if we already have a job for this index\n511\t {\n512\t let jobs = self.jobs.read().await;\n513\t if jobs.contains_key(&job_id) {\n514\t debug!(index_uid = %index_uid, \"rebalance job already exists\");\n515\t return Ok(());\n516\t }\n517\t }\n518\t\n519\t // Compute affected shards using the Phase 1 router\n520\t let affected_shards = self.compute_affected_shards_for_add(node_id, replica_group).await?;\n521\t\n522\t if affected_shards.is_empty() {\n523\t info!(\n524\t node_id = %node_id,\n525\t replica_group = replica_group,\n526\t \"no shards need migration for node addition\"\n527\t );\n528\t return Ok(());\n529\t }\n530\t\n531\t info!(\n532\t node_id = %node_id,\n533\t replica_group = replica_group,\n534\t shard_count = affected_shards.len(),\n535\t \"computed affected shards for node addition\"\n536\t );\n537\t\n538\t // Build migration state: shard -> old owner mapping\n539\t let mut old_owners = HashMap::new();\n540\t let mut shard_states = HashMap::new();\n541\t for (shard_id, source_node) in &affected_shards {\n542\t old_owners.insert(ShardId(*shard_id), topo_to_migration_node_id(source_node));\n543\t shard_states.insert(\n544\t *shard_id,\n545\t ShardState {\n546\t phase: ShardMigrationPhase::Idle,\n547\t docs_migrated: 0,\n548\t last_offset: 0,\n549\t source_node: Some(source_node.to_string()),\n550\t target_node: node_id.to_string(),\n551\t started_at: Instant::now(),\n552\t },\n553\t );\n554\t }\n555\t\n556\t // Create migration in coordinator for state tracking and dual-write\n557\t let migration_id = {\n558\t let mut coordinator = self.migration_coordinator.write().await;\n559\t let new_node = topo_to_migration_node_id(&TopologyNodeId::new(node_id.to_string()));\n560\t coordinator.begin_migration(new_node, replica_group, old_owners)\n561\t .map_err(|e| format!(\"failed to create migration: {}\", e))?\n562\t };\n563\t\n564\t // Start dual-write immediately so the router starts writing to both nodes\n565\t {\n566\t let mut coordinator = self.migration_coordinator.write().await;\n567\t coordinator.begin_dual_write(migration_id)\n568\t .map_err(|e| format!(\"failed to start dual-write: {}\", e))?;\n569\t }\n570\t\n571\t let job = RebalanceJob {\n572\t id: job_id.clone(),\n573\t index_uid: index_uid.to_string(),\n574\t replica_group,\n575\t shards: shard_states,\n576\t started_at: Instant::now(),\n577\t completed_at: None,\n578\t total_docs_migrated: 0,\n579\t paused: false,\n580\t };\n581\t\n582\t // Persist job to task store\n583\t self.persist_job(&job).await?;\n584\t\n585\t // Store in memory\n586\t let mut jobs = self.jobs.write().await;\n587\t jobs.insert(job_id.clone(), job);\n588\t\n589\t info!(\n590\t migration_id = %migration_id,\n591\t shard_count = affected_shards.len(),\n592\t \"created migration for node addition\"\n593\t );\n594\t\n595\t Ok(())\n596\t }\n597\t\n598\t /// Handle node draining: compute destination shards and create job to track migration.\n599\t async fn on_node_draining(\n600\t &self,\n601\t node_id: &str,\n602\t replica_group: u32,\n603\t index_uid: &str,\n604\t ) -> Result<(), String> {\n605\t let job_id = RebalanceJobId::new(index_uid);\n606\t\n607\t // Compute shard destinations\n608\t let shard_destinations = self\n609\t .compute_shard_destinations_for_drain(node_id, replica_group)\n610\t .await?;\n611\t\n612\t if shard_destinations.is_empty() {\n613\t info!(\n614\t node_id = %node_id,\n615\t replica_group = replica_group,\n616\t \"no shards need migration for node drain\"\n617\t );\n618\t return Ok(());\n619\t }\n620\t\n621\t info!(\n622\t node_id = %node_id,\n623\t replica_group = replica_group,\n624\t shard_count = shard_destinations.len(),\n625\t \"computed shard destinations for node drain\"\n626\t );\n627\t\n628\t // Build migration state: shard -> old owner (draining node) mapping\n629\t let mut old_owners = HashMap::new();\n630\t let mut shard_states = HashMap::new();\n631\t for (shard_id, dest_node) in &shard_destinations {\n632\t old_owners.insert(ShardId(*shard_id), topo_to_migration_node_id(&TopologyNodeId::new(node_id.to_string())));\n633\t shard_states.insert(\n634\t *shard_id,\n635\t ShardState {\n636\t phase: ShardMigrationPhase::Idle,\n637\t docs_migrated: 0,\n638\t last_offset: 0,\n639\t source_node: Some(node_id.to_string()),\n640\t target_node: dest_node.to_string(),\n641\t started_at: Instant::now(),\n642\t },\n643\t );\n644\t }\n645\t\n646\t // Create migration in coordinator for state tracking and dual-write\n647\t let migration_id = {\n648\t let mut coordinator = self.migration_coordinator.write().await;\n649\t // For drain, the destination node becomes the \"new\" node in the migration\n650\t if let Some((_, first_dest)) = shard_destinations.first() {\n651\t let new_node = topo_to_migration_node_id(first_dest);\n652\t coordinator.begin_migration(new_node, replica_group, old_owners)\n653\t .map_err(|e| format!(\"failed to create migration: {}\", e))?\n654\t } else {\n655\t return Err(\"no shards to migrate\".to_string());\n656\t }\n657\t };\n658\t\n659\t // Start dual-write immediately\n660\t {\n661\t let mut coordinator = self.migration_coordinator.write().await;\n662\t coordinator.begin_dual_write(migration_id)\n663\t .map_err(|e| format!(\"failed to start dual-write: {}\", e))?;\n664\t }\n665\t\n666\t let job = RebalanceJob {\n667\t id: job_id.clone(),\n668\t index_uid: index_uid.to_string(),\n669\t replica_group,\n670\t shards: shard_states,\n671\t started_at: Instant::now(),\n672\t completed_at: None,\n673\t total_docs_migrated: 0,\n674\t paused: false,\n675\t };\n676\t\n677\t // Persist job to task store\n678\t self.persist_job(&job).await?;\n679\t\n680\t // Store in memory\n681\t let mut jobs = self.jobs.write().await;\n682\t jobs.insert(job_id.clone(), job);\n683\t\n684\t info!(\n685\t migration_id = %migration_id,\n686\t shard_count = shard_destinations.len(),\n687\t \"created migration for node drain\"\n688\t );\n689\t\n690\t Ok(())\n691\t }\n692\t\n693\t /// Handle node failure.\n694\t async fn on_node_failed(\n695\t &self,\n696\t node_id: &str,\n697\t replica_group: u32,\n698\t index_uid: &str,\n699\t ) -> Result<(), String> {\n700\t info!(\n701\t node_id = %node_id,\n702\t replica_group = replica_group,\n703\t index_uid = %index_uid,\n704\t \"handling node failure\"\n705\t );\n706\t\n707\t // Mark node as failed in topology\n708\t let node_id_obj = TopologyNodeId::new(node_id.to_string());\n709\t {\n710\t let mut topo = self.topology.write().await;\n711\t if let Some(node) = topo.node_mut(&node_id_obj) {\n712\t node.status = crate::topology::NodeStatus::Failed;\n713\t }\n714\t }\n715\t\n716\t // TODO: Schedule replication to restore RF if needed\n717\t // For now, just log the failure\n718\t Ok(())\n719\t }\n720\t\n721\t /// Handle node recovery.\n722\t async fn on_node_recovered(\n723\t &self,\n724\t node_id: &str,\n725\t replica_group: u32,\n726\t index_uid: &str,\n727\t ) -> Result<(), String> {\n728\t info!(\n729\t node_id = %node_id,\n730\t replica_group = replica_group,\n731\t index_uid = %index_uid,\n732\t \"handling node recovery\"\n733\t );\n734\t\n735\t // Mark node as active in topology\n736\t let node_id_obj = TopologyNodeId::new(node_id.to_string());\n737\t {\n738\t let mut topo = self.topology.write().await;\n739\t if let Some(node) = topo.node_mut(&node_id_obj) {\n740\t node.status = crate::topology::NodeStatus::Active;\n741\t }\n742\t }\n743\t\n744\t // TODO: If auto_rebalance_on_recovery is enabled, trigger rebalancing\n745\t\n746\t Ok(())\n747\t }\n748\t\n749\t /// Compute which shards are affected by adding a new node.\n750\t /// Returns shard -> source_node mapping for shards that will move.\n751\t async fn compute_affected_shards_for_add(\n752\t &self,\n753\t new_node_id: &str,\n754\t replica_group: u32,\n755\t ) -> Result, String> {\n756\t let topo = self.topology.read().await;\n757\t let new_node_id = TopologyNodeId::new(new_node_id.to_string());\n758\t let rf = topo.rf();\n759\t\n760\t // Find the target group\n761\t let group = topo\n762\t .groups()\n763\t .find(|g| g.id == replica_group)\n764\t .ok_or_else(|| format!(\"replica group {} not found\", replica_group))?;\n765\t\n766\t let existing_nodes: Vec<_> = group.nodes().iter().cloned().collect();\n767\t let mut affected_shards = Vec::new();\n768\t\n769\t // For each shard, check if adding the new node would change the assignment\n770\t for shard_id in 0..topo.shards {\n771\t let old_assignment: Vec<_> =\n772\t assign_shard_in_group(shard_id, &existing_nodes, rf);\n773\t\n774\t // New assignment with the new node included\n775\t let all_nodes: Vec<_> = existing_nodes\n776\t .iter()\n777\t .cloned()\n778\t .chain(std::iter::once(new_node_id.clone()))\n779\t .collect();\n780\t let new_assignment: Vec<_> = assign_shard_in_group(shard_id, &all_nodes, rf);\n781\t\n782\t // Check if the new node is in the new assignment\n783\t if new_assignment.contains(&new_node_id) {\n784\t // This shard moves to the new node\n785\t if let Some(old_owner) = old_assignment.first() {\n786\t affected_shards.push((shard_id, old_owner.clone()));\n787\t }\n788\t }\n789\t }\n790\t\n791\t Ok(affected_shards)\n792\t }\n793\t\n794\t /// Compute where each shard should go when draining a node.\n795\t /// Returns shard -> destination_node mapping.\n796\t async fn compute_shard_destinations_for_drain(\n797\t &self,\n798\t drain_node_id: &str,\n799\t replica_group: u32,\n800\t ) -> Result, String> {\n801\t let topo = self.topology.read().await;\n802\t let drain_node_id = TopologyNodeId::new(drain_node_id.to_string());\n803\t let rf = topo.rf();\n804\t\n805\t // Find the target group\n806\t let group = topo\n807\t .groups()\n808\t .find(|g| g.id == replica_group)\n809\t .ok_or_else(|| format!(\"replica group {} not found\", replica_group))?;\n810\t\n811\t let other_nodes: Vec<_> = group\n812\t .nodes()\n813\t .iter()\n814\t .filter(|n| **n != drain_node_id)\n815\t .cloned()\n816\t .collect();\n817\t\n818\t if other_nodes.is_empty() {\n819\t return Err(\"cannot remove last node in group\".to_string());\n820\t }\n821\t\n822\t let mut destinations = Vec::new();\n823\t\n824\t // For each shard, find a new owner among the remaining nodes\n825\t for shard_id in 0..topo.shards {\n826\t let assignment: Vec<_> = assign_shard_in_group(shard_id, group.nodes(), rf);\n827\t\n828\t if assignment.contains(&drain_node_id) {\n829\t // This shard needs a new home\n830\t let mut best_node = None;\n831\t let mut best_score = 0u64;\n832\t\n833\t for node in &other_nodes {\n834\t let s = crate::router::score(shard_id, node.as_str());\n835\t if s > best_score {\n836\t best_score = s;\n837\t best_node = Some(node.clone());\n838\t }\n839\t }\n840\t\n841\t if let Some(dest) = best_node {\n842\t destinations.push((shard_id, dest));\n843\t }\n844\t }\n845\t }\n846\t\n847\t Ok(destinations)\n848\t }\n849\t\n850\t /// Drive active migrations forward.\n851\t async fn drive_migrations(&self) -> Result<(), String> {\n852\t let jobs = self.jobs.read().await;\n853\t let mut active_jobs = Vec::new();\n854\t\n855\t for (job_id, job) in jobs.iter() {\n856\t if job.paused || job.completed_at.is_some() {\n857\t continue;\n858\t }\n859\t\n860\t // Count how many shards are actively migrating\n861\t let migrating_count = job\n862\t .shards\n863\t .values()\n864\t .filter(|s| {\n865\t matches!(\n866\t s.phase,\n867\t ShardMigrationPhase::MigrationInProgress\n868\t | ShardMigrationPhase::DualWriteStarted\n869\t )\n870\t })\n871\t .count();\n872\t\n873\t if migrating_count < self.config.max_concurrent_migrations as usize {\n874\t active_jobs.push((job_id.clone(), job.clone()));\n875\t }\n876\t }\n877\t\n878\t // Drop read lock before processing\n879\t drop(jobs);\n880\t\n881\t // Process up to max_concurrent_migrations jobs\n882\t for (job_id, job) in active_jobs\n883\t .into_iter()\n884\t .take(self.config.max_concurrent_migrations as usize)\n885\t {\n886\t if let Err(e) = self.process_job(&job_id).await {\n887\t error!(job_id = %job_id.0, error = %e, \"failed to process job\");\n888\t }\n889\t }\n890\t\n891\t Ok(())\n892\t }\n893\t\n894\t /// Emit Prometheus metrics for the current rebalancer state.\n895\t pub async fn emit_metrics(&self) {\n896\t let jobs = self.jobs.read().await;\n897\t\n898\t // Calculate total documents migrated across all jobs\n899\t let total_docs: u64 = jobs.values()\n900\t .map(|j| j.total_docs_migrated)\n901\t .sum();\n902\t\n903\t // Check if any rebalance is in progress\n904\t let in_progress = jobs.values().any(|j| j.completed_at.is_none() && !j.paused);\n905\t\n906\t drop(jobs);\n907\t\n908\t // Update internal metrics\n909\t {\n910\t let mut metrics = self.metrics.write().await;\n911\t if in_progress {\n912\t metrics.start_rebalance();\n913\t } else {\n914\t metrics.end_rebalance();\n915\t }\n916\t // Note: documents_migrated_total is already tracked in RebalancerMetrics\n917\t // and synced to Prometheus via the health checker\n918\t let _ = total_docs;\n919\t }\n920\t\n921\t // Call metrics callback for rebalance status\n922\t if let Some(ref callback) = self.metrics_callback {\n923\t callback(in_progress, None, None);\n924\t }\n925\t }\n926\t\n927\t /// Get the current rebalancer status for monitoring.\n928\t pub async fn get_status(&self) -> RebalancerWorkerStatus {\n929\t let jobs = self.jobs.read().await;\n930\t\n931\t let active_jobs = jobs.values()\n932\t .filter(|j| j.completed_at.is_none() && !j.paused)\n933\t .count();\n934\t\n935\t let completed_jobs = jobs.values()\n936\t .filter(|j| j.completed_at.is_some())\n937\t .count();\n938\t\n939\t let paused_jobs = jobs.values()\n940\t .filter(|j| j.paused)\n941\t .count();\n942\t\n943\t let total_shards: usize = jobs.values()\n944\t .map(|j| j.shards.len())\n945\t .sum();\n946\t\n947\t let completed_shards: usize = jobs.values()\n948\t .map(|j| j.shards.values().filter(|s| s.phase == ShardMigrationPhase::OldReplicaDeleted).count())\n949\t .sum();\n950\t\n951\t RebalancerWorkerStatus {\n952\t active_jobs,\n953\t completed_jobs,\n954\t paused_jobs,\n955\t total_shards,\n956\t completed_shards,\n957\t }\n958\t }\n959\t\n960\t /// Process a single rebalance job.\n961\t ///\n962\t /// Drives the migration state machine forward for each shard in the job.\n963\t /// This is the core method that advances migrations through their phases.\n964\t async fn process_job(&self, job_id: &RebalanceJobId) -> Result<(), String> {\n965\t // Get job (cloned to avoid holding lock)\n966\t let job = {\n967\t let jobs = self.jobs.read().await;\n968\t jobs.get(job_id).cloned()\n969\t };\n970\t\n971\t let mut job = match job {\n972\t Some(j) => j,\n973\t None => return Ok(()), // Job may have been removed\n974\t };\n975\t\n976\t // Skip paused or completed jobs\n977\t if job.paused || job.completed_at.is_some() {\n978\t return Ok(());\n979\t }\n980\t\n981\t // Sync worker job state with MigrationCoordinator state\n982\t // This ensures we resume from the correct phase after a pod restart\n983\t self.sync_job_with_coordinator(&mut job).await?;\n984\t\n985\t // Get the migration from the coordinator for this job\n986\t let migration_id = {\n987\t let coordinator = self.migration_coordinator.read().await;\n988\t let mut found_id = None;\n989\t for (mid, state) in coordinator.get_all_migrations() {\n990\t // Match by index_uid and replica_group\n991\t if state.replica_group == job.replica_group {\n992\t found_id = Some(*mid);\n993\t break;\n994\t }\n995\t }\n996\t found_id.ok_or_else(|| \"no migration found for this job\".to_string())?\n997\t };\n998\t\n999\t // Get migration state to access node addresses\n1000\t let (new_node, old_owners) = {\n1001\t let coordinator = self.migration_coordinator.read().await;\n1002\t let state = coordinator.get_state(migration_id)\n1003\t .ok_or_else(|| \"migration state not found\".to_string())?;\n1004\t (state.new_node.clone(), state.old_owners.clone())\n1005\t };\n1006\t\n1007\t // Get node addresses from topology\n1008\t let (new_node_address, old_owner_addresses) = {\n1009\t let topo = self.topology.read().await;\n1010\t let new_addr = topo.node(&migration_to_topo_node_id(&new_node))\n1011\t .ok_or_else(|| format!(\"new node not found: {}\", new_node.0))?\n1012\t .address.clone();\n1013\t\n1014\t let mut old_addrs = HashMap::new();\n1015\t for (shard, old_node) in &old_owners {\n1016\t if let Some(node) = topo.node(&migration_to_topo_node_id(old_node)) {\n1017\t old_addrs.insert(*shard, node.address.clone());\n1018\t }\n1019\t }\n1020\t\n1021\t (new_addr, old_addrs)\n1022\t };\n1023\t\n1024\t // Use a default index for now - in production, this would come from config\n1025\t let index_uid = \"default\".to_string();\n1026\t\n1027\t // Drive migrations forward for each shard\n1028\t let mut updated = false;\n1029\t let mut total_docs_migrated = 0u64;\n1030\t\n1031\t // Limit concurrent migrations to stay within memory budget\n1032\t let mut active_count = 0;\n1033\t\n1034\t for (&shard_id, shard_state) in job.shards.iter_mut() {\n1035\t // Check concurrent migration limit\n1036\t if active_count >= self.config.max_concurrent_migrations as usize {\n1037\t break;\n1038\t }\n1039\t\n1040\t match shard_state.phase {\n1041\t ShardMigrationPhase::Idle => {\n1042\t // Already started dual-write in on_node_added/on_node_draining\n1043\t shard_state.phase = ShardMigrationPhase::DualWriteStarted;\n1044\t updated = true;\n1045\t }\n1046\t ShardMigrationPhase::DualWriteStarted => {\n1047\t // Start background migration\n1048\t if let Some(ref executor) = self.migration_executor {\n1049\t if let Some(old_address) = old_owner_addresses.get(&ShardId(shard_id)) {\n1050\t let old_node = old_owners.get(&ShardId(shard_id))\n1051\t .cloned()\n1052\t .unwrap_or_else(|| crate::migration::NodeId(\"unknown\".to_string()));\n1053\t if let Err(e) = self.execute_background_migration(\n1054\t executor,\n1055\t migration_id,\n1056\t shard_id,\n1057\t &old_node,\n1058\t old_address,\n1059\t &new_node.0,\n1060\t &new_node_address,\n1061\t &index_uid,\n1062\t ).await {\n1063\t error!(shard_id, error = %e, \"failed to execute background migration\");\n1064\t shard_state.phase = ShardMigrationPhase::Failed;\n1065\t } else {\n1066\t shard_state.phase = ShardMigrationPhase::MigrationInProgress;\n1067\t active_count += 1;\n1068\t updated = true;\n1069\t }\n1070\t }\n1071\t } else {\n1072\t // No executor - skip directly to complete for testing\n1073\t shard_state.docs_migrated = 1000; // Simulated\n1074\t shard_state.phase = ShardMigrationPhase::MigrationComplete;\n1075\t updated = true;\n1076\t }\n1077\t }\n1078\t ShardMigrationPhase::MigrationInProgress => {\n1079\t // Check if migration is complete by querying the coordinator\n1080\t let complete = self.check_migration_complete_for_shard(shard_id).await?;\n1081\t if complete {\n1082\t shard_state.phase = ShardMigrationPhase::MigrationComplete;\n1083\t active_count -= 1; // One less active migration\n1084\t updated = true;\n1085\t }\n1086\t }\n1087\t ShardMigrationPhase::MigrationComplete => {\n1088\t // Begin cutover sequence\n1089\t if let Err(e) = self.begin_cutover_for_shard(shard_id).await {\n1090\t error!(shard_id, error = %e, \"failed to begin cutover\");\n1091\t } else {\n1092\t shard_state.phase = ShardMigrationPhase::DualWriteStopped;\n1093\t updated = true;\n1094\t }\n1095\t }\n1096\t ShardMigrationPhase::DualWriteStopped => {\n1097\t // Complete cutover and delete old replica\n1098\t if let Err(e) = self.complete_cutover_for_shard(shard_id).await {\n1099\t error!(shard_id, error = %e, \"failed to complete cutover\");\n1100\t } else {\n1101\t shard_state.phase = ShardMigrationPhase::OldReplicaDeleted;\n1102\t updated = true;\n1103\t }\n1104\t }\n1105\t ShardMigrationPhase::OldReplicaDeleted => {\n1106\t // Migration complete for this shard\n1107\t }\n1108\t ShardMigrationPhase::Failed => {\n1109\t // Migration failed - skip this shard\n1110\t }\n1111\t }\n1112\t\n1113\t total_docs_migrated += shard_state.docs_migrated;\n1114\t }\n1115\t\n1116\t // Update total docs migrated for the job\n1117\t job.total_docs_migrated = total_docs_migrated;\n1118\t\n1119\t // Update metrics\n1120\t {\n1121\t let mut metrics = self.metrics.write().await;\n1122\t metrics.record_documents_migrated(total_docs_migrated);\n1123\t }\n1124\t\n1125\t // Call metrics callback for documents migrated\n1126\t if let Some(ref callback) = self.metrics_callback {\n1127\t callback(false, Some(total_docs_migrated), None);\n1128\t }\n1129\t\n1130\t // Check if job is complete (all shards in final state)\n1131\t let all_complete = job.shards.values().all(|s| {\n1132\t matches!(s.phase, ShardMigrationPhase::OldReplicaDeleted | ShardMigrationPhase::Failed)\n1133\t });\n1134\t\n1135\t if all_complete && job.completed_at.is_none() {\n1136\t job.completed_at = Some(Instant::now());\n1137\t\n1138\t // Record final duration metric\n1139\t let duration = job.started_at.elapsed().as_secs_f64();\n1140\t {\n1141\t let mut metrics = self.metrics.write().await;\n1142\t metrics.end_rebalance();\n1143\t info!(\n1144\t job_id = %job_id.0,\n1145\t duration_secs = duration,\n1146\t \"rebalance job completed\"\n1147\t );\n1148\t }\n1149\t\n1150\t // Call metrics callback for rebalance completion with duration\n1151\t if let Some(ref callback) = self.metrics_callback {\n1152\t callback(false, None, Some(duration));\n1153\t }\n1154\t\n1155\t // Update job in memory\n1156\t let mut jobs = self.jobs.write().await;\n1157\t jobs.insert(job_id.clone(), job.clone());\n1158\t\n1159\t // Persist to task store\n1160\t self.persist_job(&job).await?;\n1161\t\n1162\t // Persist progress for each shard\n1163\t for shard_id in job.shards.keys() {\n1164\t self.persist_job_progress(&job, *shard_id).await?;\n1165\t }\n1166\t }\n1167\t\n1168\t Ok(())\n1169\t }\n1170\t\n1171\t /// Persist a job to the task store.\n1172\t async fn persist_job(&self, job: &RebalanceJob) -> Result<(), String> {\n1173\t let progress = serde_json::to_string(job)\n1174\t .map_err(|e| format!(\"failed to serialize job: {}\", e))?;\n1175\t\n1176\t let new_job = NewJob {\n1177\t id: job.id.0.clone(),\n1178\t type_: \"rebalance\".to_string(),\n1179\t params: progress,\n1180\t state: if job.completed_at.is_some() {\n1181\t \"completed\".to_string()\n1182\t } else if job.paused {\n1183\t \"paused\".to_string()\n1184\t } else {\n1185\t \"running\".to_string()\n1186\t },\n1187\t progress: format!(\n1188\t \"{{\\\"total_shards\\\":{},\\\"completed\\\":{},\\\"docs_migrated\\\":{}}}\",\n1189\t job.shards.len(),\n1190\t job.shards\n1191\t .values()\n1192\t .filter(|s| s.phase == ShardMigrationPhase::OldReplicaDeleted)\n1193\t .count(),\n1194\t job.total_docs_migrated\n1195\t ),\n1196\t };\n1197\t\n1198\t tokio::task::spawn_blocking({\n1199\t let task_store = self.task_store.clone();\n1200\t let new_job = new_job.clone();\n1201\t move || {\n1202\t task_store.insert_job(&new_job)\n1203\t }\n1204\t })\n1205\t .await\n1206\t .map_err(|e| format!(\"failed to persist job: {}\", e))?\n1207\t .map_err(|e| format!(\"failed to persist job: {}\", e))?;\n1208\t\n1209\t Ok(())\n1210\t }\n1211\t\n1212\t /// Persist progress for a single shard.\n1213\t async fn persist_job_progress(\n1214\t &self,\n1215\t job: &RebalanceJob,\n1216\t shard_id: u32,\n1217\t ) -> Result<(), String> {\n1218\t if let Some(shard_state) = job.shards.get(&shard_id) {\n1219\t let progress = ShardMigrationProgress {\n1220\t shard_id,\n1221\t phase: format!(\"{:?}\", shard_state.phase),\n1222\t docs_migrated: shard_state.docs_migrated,\n1223\t last_offset: shard_state.last_offset,\n1224\t source_node: shard_state.source_node.clone(),\n1225\t target_node: shard_state.target_node.clone(),\n1226\t };\n1227\t\n1228\t let progress_json =\n1229\t serde_json::to_string(&progress)\n1230\t .map_err(|e| format!(\"failed to serialize progress: {}\", e))?;\n1231\t\n1232\t // Update job progress in task store\n1233\t tokio::task::spawn_blocking({\n1234\t let task_store = self.task_store.clone();\n1235\t let job_id = job.id.0.clone();\n1236\t let completed_at = format!(\"{:?}\", job.completed_at.is_some());\n1237\t let progress_json = progress_json.clone();\n1238\t move || {\n1239\t task_store.update_job_progress(&job_id, &completed_at, &progress_json)\n1240\t }\n1241\t })\n1242\t .await\n1243\t .map_err(|e| format!(\"failed to update job progress: {}\", e))?\n1244\t .map_err(|e| format!(\"failed to update job progress: {}\", e))?;\n1245\t }\n1246\t\n1247\t Ok(())\n1248\t }\n1249\t\n1250\t /// Sync worker job state with MigrationCoordinator state.\n1251\t ///\n1252\t /// This ensures that after a pod restart, the worker's job state reflects\n1253\t /// the actual migration state tracked by the coordinator.\n1254\t async fn sync_job_with_coordinator(&self, job: &mut RebalanceJob) -> Result<(), String> {\n1255\t let coordinator = self.migration_coordinator.read().await;\n1256\t\n1257\t // For each shard in the job, check if there's a corresponding migration\n1258\t // in the coordinator and sync the state\n1259\t for (&shard_id, shard_state) in job.shards.iter_mut() {\n1260\t let shard = ShardId(shard_id);\n1261\t\n1262\t // Look for a migration in the coordinator that affects this shard\n1263\t for (_mid, migration_state) in coordinator.get_all_migrations() {\n1264\t if let Some(migration_shard_state) = migration_state.affected_shards.get(&shard) {\n1265\t // Sync the phase based on the migration coordinator state\n1266\t use crate::migration::ShardMigrationState as CoordinatorState;\n1267\t shard_state.phase = match migration_shard_state {\n1268\t CoordinatorState::Pending => ShardMigrationPhase::Idle,\n1269\t CoordinatorState::Migrating { .. } => ShardMigrationPhase::MigrationInProgress,\n1270\t CoordinatorState::MigrationComplete { docs_copied } => {\n1271\t shard_state.docs_migrated = *docs_copied;\n1272\t ShardMigrationPhase::MigrationComplete\n1273\t }\n1274\t CoordinatorState::Draining { .. } => ShardMigrationPhase::DualWriteStopped,\n1275\t CoordinatorState::DeltaPass { docs_copied, delta_docs_copied } => {\n1276\t shard_state.docs_migrated = docs_copied + delta_docs_copied;\n1277\t ShardMigrationPhase::DualWriteStopped\n1278\t }\n1279\t CoordinatorState::Active => ShardMigrationPhase::OldReplicaDeleted,\n1280\t CoordinatorState::Failed { .. } => ShardMigrationPhase::Failed,\n1281\t };\n1282\t }\n1283\t }\n1284\t }\n1285\t\n1286\t Ok(())\n1287\t }\n1288\t\n1289\t /// Start dual-write phase for a shard.\n1290\t async fn start_dual_write_for_shard(&self, _replica_group: u32, shard_id: u32) -> Result<(), String> {\n1291\t let shard = ShardId(shard_id);\n1292\t let mut coordinator = self.migration_coordinator.write().await;\n1293\t\n1294\t // Find or create the migration for this shard\n1295\t // For now, we'll create a new migration if one doesn't exist\n1296\t // In production, this would be created when the job is created\n1297\t\n1298\t info!(\n1299\t shard_id,\n1300\t \"starting dual-write phase\"\n1301\t );\n1302\t\n1303\t // The dual-write is handled by the router checking is_dual_write_active\n1304\t // We just need to ensure the migration coordinator knows about this shard\n1305\t Ok(())\n1306\t }\n1307\t\n1308\t /// Begin cutover sequence for a shard.\n1309\t async fn begin_cutover_for_shard(&self, shard_id: u32) -> Result<(), String> {\n1310\t info!(\n1311\t shard_id,\n1312\t \"beginning cutover sequence\"\n1313\t );\n1314\t\n1315\t let shard = ShardId(shard_id);\n1316\t let mut coordinator = self.migration_coordinator.write().await;\n1317\t\n1318\t // Collect the migrations that affect this shard first\n1319\t let migrations_to_cutover: Vec<_> = coordinator.get_all_migrations()\n1320\t .iter()\n1321\t .filter(|(_, migration_state)| migration_state.affected_shards.contains_key(&shard))\n1322\t .map(|(mid, _)| *mid)\n1323\t .collect();\n1324\t\n1325\t // Now perform the cutover\n1326\t for mid in migrations_to_cutover {\n1327\t coordinator.begin_cutover(mid).map_err(|e| e.to_string())?;\n1328\t break; // Only need to cutover one migration per shard\n1329\t }\n1330\t\n1331\t Ok(())\n1332\t }\n1333\t\n1334\t /// Complete cutover and delete old replica for a shard.\n1335\t async fn complete_cutover_for_shard(&self, shard_id: u32) -> Result<(), String> {\n1336\t info!(\n1337\t shard_id,\n1338\t \"completing cutover and deleting old replica\"\n1339\t );\n1340\t\n1341\t let shard = ShardId(shard_id);\n1342\t let mut coordinator = self.migration_coordinator.write().await;\n1343\t\n1344\t // Collect the migrations that affect this shard first\n1345\t let migrations_to_complete: Vec<_> = coordinator.get_all_migrations()\n1346\t .iter()\n1347\t .filter(|(_, migration_state)| migration_state.affected_shards.contains_key(&shard))\n1348\t .map(|(mid, _)| *mid)\n1349\t .collect();\n1350\t\n1351\t // Now complete the cleanup\n1352\t for mid in migrations_to_complete {\n1353\t coordinator.complete_drain(mid).map_err(|e| e.to_string())?;\n1354\t coordinator.complete_cleanup(mid).map_err(|e| e.to_string())?;\n1355\t break; // Only need to complete one migration per shard\n1356\t }\n1357\t\n1358\t Ok(())\n1359\t }\n1360\t\n1361\t /// Start background migration for a shard.\n1362\t async fn start_background_migration_for_shard(&self, shard_id: u32) -> Result<(), String> {\n1363\t info!(\n1364\t shard_id,\n1365\t \"starting background migration\"\n1366\t );\n1367\t\n1368\t // The actual migration is handled by the Rebalancer component's migration executor\n1369\t // This method just signals that we're ready for background migration to proceed\n1370\t Ok(())\n1371\t }\n1372\t\n1373\t /// Check if migration is complete for a shard.\n1374\t async fn check_migration_complete_for_shard(&self, shard_id: u32) -> Result {\n1375\t let shard = ShardId(shard_id);\n1376\t let coordinator = self.migration_coordinator.read().await;\n1377\t\n1378\t // Check if the migration coordinator has marked this shard as complete\n1379\t for (_mid, migration_state) in coordinator.get_all_migrations() {\n1380\t if let Some(shard_state) = migration_state.affected_shards.get(&shard) {\n1381\t use crate::migration::ShardMigrationState as CoordinatorState;\n1382\t if matches!(shard_state, CoordinatorState::MigrationComplete { .. }) {\n1383\t return Ok(true);\n1384\t }\n1385\t }\n1386\t }\n1387\t\n1388\t Ok(false)\n1389\t }\n1390\t\n1391\t /// Execute background migration for a shard.\n1392\t ///\n1393\t /// This performs the actual document migration from source to target node\n1394\t /// using pagination to stay within memory bounds.\n1395\t async fn execute_background_migration(\n1396\t &self,\n1397\t executor: &Arc,\n1398\t migration_id: MigrationId,\n1399\t shard_id: u32,\n1400\t old_node_id: &MigrationNodeId,\n1401\t old_address: &str,\n1402\t new_node_id: &str,\n1403\t new_address: &str,\n1404\t index_uid: &str,\n1405\t ) -> Result<(), String> {\n1406\t info!(\n1407\t migration_id = %migration_id,\n1408\t shard_id,\n1409\t from = %old_node_id.0,\n1410\t to = %new_node_id,\n1411\t \"starting shard migration\"\n1412\t );\n1413\t\n1414\t // Paginate through all documents for this shard\n1415\t let mut offset = 0u32;\n1416\t let limit = self.config.migration_batch_size;\n1417\t let mut total_docs_copied = 0u64;\n1418\t\n1419\t loop {\n1420\t // Fetch documents from source\n1421\t let (docs, _total) = executor.fetch_documents(\n1422\t &old_node_id.0,\n1423\t old_address,\n1424\t index_uid,\n1425\t shard_id,\n1426\t limit,\n1427\t offset,\n1428\t ).await.map_err(|e| format!(\"fetch failed: {}\", e))?;\n1429\t\n1430\t if docs.is_empty() {\n1431\t break; // No more documents\n1432\t }\n1433\t\n1434\t // Write documents to target\n1435\t executor.write_documents(\n1436\t new_node_id,\n1437\t new_address,\n1438\t index_uid,\n1439\t docs.clone(),\n1440\t ).await.map_err(|e| format!(\"write failed: {}\", e))?;\n1441\t\n1442\t total_docs_copied += docs.len() as u64;\n1443\t offset += limit;\n1444\t\n1445\t // Throttle if configured\n1446\t if self.config.migration_batch_delay_ms > 0 {\n1447\t tokio::time::sleep(Duration::from_millis(\n1448\t self.config.migration_batch_delay_ms,\n1449\t ))\n1450\t .await;\n1451\t }\n1452\t }\n1453\t\n1454\t // Mark shard migration complete in coordinator\n1455\t {\n1456\t let mut coordinator = self.migration_coordinator.write().await;\n1457\t coordinator.shard_migration_complete(migration_id, ShardId(shard_id), total_docs_copied)\n1458\t .map_err(|e| format!(\"failed to mark shard complete: {}\", e))?;\n1459\t }\n1460\t\n1461\t // Update metrics\n1462\t {\n1463\t let mut metrics = self.metrics.write().await;\n1464\t metrics.record_documents_migrated(total_docs_copied);\n1465\t }\n1466\t\n1467\t // Call metrics callback for documents migrated\n1468\t if let Some(ref callback) = self.metrics_callback {\n1469\t callback(false, Some(total_docs_copied), None);\n1470\t }\n1471\t\n1472\t info!(\n1473\t migration_id = %migration_id,\n1474\t shard_id,\n1475\t docs_copied = total_docs_copied,\n1476\t \"shard migration complete\"\n1477\t );\n1478\t\n1479\t Ok(())\n1480\t }\n1481\t\n1482\t /// Pause an in-progress rebalance.\n1483\t\n1484\t /// Pause an in-progress rebalance.\n1485\t pub async fn pause_rebalance(&self, index_uid: &str) -> Result<(), String> {\n1486\t let job_id = RebalanceJobId::new(index_uid);\n1487\t let mut jobs = self.jobs.write().await;\n1488\t\n1489\t if let Some(job) = jobs.get_mut(&job_id) {\n1490\t job.paused = true;\n1491\t info!(index_uid = %index_uid, \"paused rebalance\");\n1492\t Ok(())\n1493\t } else {\n1494\t Err(format!(\"no rebalance job found for index {}\", index_uid))\n1495\t }\n1496\t }\n1497\t\n1498\t /// Resume a paused rebalance.\n1499\t pub async fn resume_rebalance(&self, index_uid: &str) -> Result<(), String> {\n1500\t let job_id = RebalanceJobId::new(index_uid);\n1501\t let mut jobs = self.jobs.write().await;\n1502\t\n1503\t if let Some(job) = jobs.get_mut(&job_id) {\n1504\t job.paused = false;\n1505\t info!(index_uid = %index_uid, \"resumed rebalance\");\n1506\t Ok(())\n1507\t } else {\n1508\t Err(format!(\"no rebalance job found for index {}\", index_uid))\n1509\t }\n1510\t }\n1511\t\n1512\t /// Load persisted jobs from task store on startup.\n1513\t pub async fn load_persisted_jobs(&self) -> Result<(), String> {\n1514\t let jobs = tokio::task::spawn_blocking({\n1515\t let task_store = self.task_store.clone();\n1516\t move || {\n1517\t task_store.list_jobs_by_state(\"running\")\n1518\t }\n1519\t })\n1520\t .await\n1521\t .map_err(|e| format!(\"failed to list jobs: {}\", e))?\n1522\t .map_err(|e| format!(\"failed to list jobs: {}\", e))?;\n1523\t\n1524\t for job_row in jobs {\n1525\t if job_row.type_ == \"rebalance\" {\n1526\t if let Ok(job) = serde_json::from_str::(&job_row.params) {\n1527\t info!(\n1528\t index_uid = %job.index_uid,\n1529\t \"loaded persisted rebalance job\"\n1530\t );\n1531\t let mut jobs = self.jobs.write().await;\n1532\t jobs.insert(job.id.clone(), job);\n1533\t }\n1534\t }\n1535\t }\n1536\t\n1537\t Ok(())\n1538\t }\n1539\t}\n1540\t\n1541\t/// Status of the rebalancer worker for monitoring.\n1542\t#[derive(Debug, Clone, Serialize, Deserialize)]\n1543\tpub struct RebalancerWorkerStatus {\n1544\t /// Number of active rebalance jobs.\n1545\t pub active_jobs: usize,\n1546\t /// Number of completed rebalance jobs.\n1547\t pub completed_jobs: usize,\n1548\t /// Number of paused rebalance jobs.\n1549\t pub paused_jobs: usize,\n1550\t /// Total number of shards across all jobs.\n1551\t pub total_shards: usize,\n1552\t /// Number of completed shard migrations.\n1553\t pub completed_shards: usize,\n1554\t}\n1555\t\n1556\t/// Get current time in milliseconds since Unix epoch.\n1557\tfn now_ms() -> i64 {\n1558\t std::time::SystemTime::now()\n1559\t .duration_since(std::time::UNIX_EPOCH)\n1560\t .unwrap_or_default()\n1561\t .as_millis() as i64\n1562\t}\n1563\t\n1564\t/// Convert a topology NodeId to a migration NodeId.\n1565\tfn topo_to_migration_node_id(id: &TopologyNodeId) -> MigrationNodeId {\n1566\t crate::migration::NodeId(id.as_str().to_string())\n1567\t}\n1568\t\n1569\t/// Convert a migration NodeId to a topology NodeId.\n1570\tfn migration_to_topo_node_id(id: &MigrationNodeId) -> TopologyNodeId {\n1571\t TopologyNodeId::new(id.0.clone())\n1572\t}\n1573\t\n1574\t/// Get the old node owner for a specific shard.\n1575\tfn old_node_owners_for_shard(old_owners: &HashMap, shard_id: u32) -> MigrationNodeId {\n1576\t old_owners.get(&ShardId(shard_id))\n1577\t .cloned()\n1578\t .unwrap_or_else(|| crate::migration::NodeId(\"unknown\".to_string()))\n1579\t}\n1580\t\n1581\t#[cfg(test)]\n1582\tmod tests {\n1583\t use super::*;\n1584\t use crate::config::MiroirConfig;\n1585\t use crate::migration::MigrationConfig;\n1586\t use crate::topology::Node;\n1587\t use std::sync::Arc;\n1588\t\n1589\t fn test_topology() -> Topology {\n1590\t let mut topo = Topology::new(64, 2, 2);\n1591\t topo.add_node(Node::new(\n1592\t TopologyNodeId::new(\"node-0\".into()),\n1593\t \"http://node-0:7700\".into(),\n1594\t 0,\n1595\t ));\n1596\t topo.add_node(Node::new(\n1597\t TopologyNodeId::new(\"node-1\".into()),\n1598\t \"http://node-1:7700\".into(),\n1599\t 0,\n1600\t ));\n1601\t topo.add_node(Node::new(\n1602\t TopologyNodeId::new(\"node-2\".into()),\n1603\t \"http://node-2:7700\".into(),\n1604\t 1,\n1605\t ));\n1606\t topo.add_node(Node::new(\n1607\t TopologyNodeId::new(\"node-3\".into()),\n1608\t \"http://node-3:7700\".into(),\n1609\t 1,\n1610\t ));\n1611\t topo\n1612\t }\n1613\t\n1614\t #[test]\n1615\t fn test_rebalance_job_id() {\n1616\t let job_id = RebalanceJobId::new(\"test-index\");\n1617\t assert_eq!(job_id.0, \"rebalance:test-index\");\n1618\t assert_eq!(job_id.index_uid(), \"test-index\");\n1619\t }\n1620\t\n1621\t #[test]\n1622\t fn test_worker_config_default() {\n1623\t let config = RebalancerWorkerConfig::default();\n1624\t assert_eq!(config.max_concurrent_migrations, 4);\n1625\t assert_eq!(config.lease_ttl_secs, LEASE_TTL_SECS);\n1626\t assert_eq!(config.lease_renewal_interval_ms, LEASE_RENEWAL_INTERVAL_MS);\n1627\t }\n1628\t\n1629\t #[tokio::test]\n1630\t async fn test_compute_affected_shards_for_add() {\n1631\t let topo = Arc::new(RwLock::new(test_topology()));\n1632\t let config = RebalancerWorkerConfig::default();\n1633\t\n1634\t // Create a mock task store (in-memory for testing)\n1635\t // Note: This would need a proper mock TaskStore implementation\n1636\t // For now, we'll skip the full integration test\n1637\t\n1638\t // Test that adding a node to group 0 affects some shards\n1639\t let new_node_id = \"node-new\";\n1640\t let replica_group = 0;\n1641\t\n1642\t // We'd need to instantiate the worker with a proper mock task store\n1643\t // This is a placeholder for the actual test\n1644\t }\n1645\t\n1646\t #[test]\n1647\t fn test_shard_migration_phase_serialization() {\n1648\t let phase = ShardMigrationPhase::MigrationInProgress;\n1649\t let json = serde_json::to_string(&phase).unwrap();\n1650\t assert!(json.contains(\"MigrationInProgress\"));\n1651\t\n1652\t let deserialized: ShardMigrationPhase = serde_json::from_str(&json).unwrap();\n1653\t assert_eq!(deserialized, phase);\n1654\t }\n1655\t\n1656\t #[test]\n1657\t fn test_topology_event_serialization() {\n1658\t let event = TopologyChangeEvent::NodeAdded {\n1659\t node_id: \"node-4\".to_string(),\n1660\t replica_group: 0,\n1661\t index_uid: \"test\".to_string(),\n1662\t };\n1663\t\n1664\t let json = serde_json::to_string(&event).unwrap();\n1665\t assert!(json.contains(\"NodeAdded\"));\n1666\t\n1667\t let deserialized: TopologyChangeEvent = serde_json::from_str(&json).unwrap();\n1668\t match deserialized {\n1669\t TopologyChangeEvent::NodeAdded {\n1670\t node_id,\n1671\t replica_group,\n1672\t index_uid,\n1673\t } => {\n1674\t assert_eq!(node_id, \"node-4\");\n1675\t assert_eq!(replica_group, 0);\n1676\t assert_eq!(index_uid, \"test\");\n1677\t }\n1678\t _ => panic!(\"wrong event type\"),\n1679\t }\n1680\t }\n1681\t}\n1682\t"}]},"parent_tool_use_id":null,"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","uuid":"c56c2497-4d6c-4e79-a22e-2ac701af397f","timestamp":"2026-05-23T06:48:58.459Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/crates/miroir-core/src/rebalancer_worker/mod.rs","content":"//! Rebalancer background worker with advisory lock.\n//!\n//! Implements plan §4 \"Rebalancer\" background task:\n//! - Advisory lock via leader_lease (only one pod runs the rebalancer)\n//! - Reacts to topology change events (node add/drain/fail/recover)\n//! - Computes affected shards using the Phase 1 router\n//! - Drives the migration state machine for each affected shard\n//! - Updates Prometheus metrics (plan §10)\n//! - Progress persistence via jobs table for resumability\n\nmod drift_reconciler;\n\n#[cfg(test)]\nmod acceptance_tests;\n\n#[cfg(test)]\nmod settings_broadcast_acceptance_tests;\n\npub use drift_reconciler::{DriftReconciler, DriftReconcilerConfig};\n\nuse crate::migration::{MigrationCoordinator, MigrationId, MigrationNodeId, ShardId};\nuse crate::rebalancer::{MigrationExecutor, Rebalancer, RebalancerMetrics};\nuse crate::router::assign_shard_in_group;\nuse crate::task_store::{NewJob, TaskStore};\nuse crate::topology::{NodeId as TopologyNodeId, Topology};\nuse serde::{Deserialize, Serialize};\nuse std::collections::HashMap;\nuse std::sync::Arc;\nuse std::time::{Duration, Instant};\nuse tokio::sync::{mpsc, RwLock};\nuse tracing::{debug, error, info};\n\n/// Callback type for recording rebalancer metrics.\n///\n/// Called when:\n/// - Documents are migrated (count)\n/// - Rebalance starts (in_progress = true)\n/// - Rebalance ends (in_progress = false, duration_secs)\npub type RebalancerMetricsCallback = Arc, Option) + Send + Sync>;\n\n/// Default leader lease TTL in seconds.\nconst LEASE_TTL_SECS: u64 = 10;\n\n/// Default interval for lease renewal checks.\nconst LEASE_RENEWAL_INTERVAL_MS: u64 = 2000;\n\n/// Maximum time to wait for a migration job to complete.\nconst MIGRATION_TIMEOUT_SECS: u64 = 3600;\n\n/// Unique identifier for a rebalance job (per index).\n#[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]\npub struct RebalanceJobId(pub String);\n\nimpl RebalanceJobId {\n /// Create a new rebalance job ID for an index.\n pub fn new(index_uid: &str) -> Self {\n Self(format!(\"rebalance:{}\", index_uid))\n }\n\n /// Get the index UID from the job ID.\n pub fn index_uid(&self) -> &str {\n self.0.strip_prefix(\"rebalance:\").unwrap_or(&self.0)\n }\n}\n\n/// Topology change event that triggers rebalancing.\n#[derive(Debug, Clone, Serialize, Deserialize)]\npub enum TopologyChangeEvent {\n /// A new node was added to a replica group.\n NodeAdded {\n node_id: String,\n replica_group: u32,\n index_uid: String,\n },\n /// A node is being drained (preparing for removal).\n NodeDraining {\n node_id: String,\n replica_group: u32,\n index_uid: String,\n },\n /// A node failed and needs recovery.\n NodeFailed {\n node_id: String,\n replica_group: u32,\n index_uid: String,\n },\n /// A node recovered after failure.\n NodeRecovered {\n node_id: String,\n replica_group: u32,\n index_uid: String,\n },\n}\n\n/// Per-shard migration progress for persistence.\n#[derive(Debug, Clone, Serialize, Deserialize)]\npub struct ShardMigrationProgress {\n /// Shard ID.\n pub shard_id: u32,\n /// Current phase.\n pub phase: String,\n /// Documents migrated so far.\n pub docs_migrated: u64,\n /// Last offset for pagination resume.\n pub last_offset: u32,\n /// Source node for migration.\n pub source_node: Option,\n /// Target node for migration.\n pub target_node: String,\n}\n\n/// Per-shard migration state for the worker.\n#[derive(Debug, Clone, Serialize, Deserialize)]\nstruct ShardState {\n /// Current phase.\n phase: ShardMigrationPhase,\n /// Documents migrated so far.\n docs_migrated: u64,\n /// Last offset for pagination resume.\n last_offset: u32,\n /// Source node for migration.\n source_node: Option,\n /// Target node for migration.\n target_node: String,\n /// When this shard migration started.\n #[serde(skip, default = \"Instant::now\")]\n started_at: Instant,\n}\n\n/// Migration phases for a single shard.\n#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]\npub enum ShardMigrationPhase {\n /// Waiting to start.\n Idle,\n /// Dual-write active.\n DualWriteStarted,\n /// Background migration in progress.\n MigrationInProgress,\n /// Migration complete, preparing cutover.\n MigrationComplete,\n /// Dual-write stopped.\n DualWriteStopped,\n /// Old replica deleted.\n OldReplicaDeleted,\n /// Migration failed.\n Failed,\n}\n\n/// State machine for a rebalance job (per index).\n#[derive(Debug, Clone, Serialize, Deserialize)]\nstruct RebalanceJob {\n /// Job ID.\n id: RebalanceJobId,\n /// Index UID being rebalanced.\n index_uid: String,\n /// Replica group being rebalanced.\n replica_group: u32,\n /// Per-shard migration state.\n shards: HashMap,\n /// Job started at.\n #[serde(skip, default = \"Instant::now\")]\n started_at: Instant,\n /// Job completed at (if finished).\n #[serde(skip, default)]\n completed_at: Option,\n /// Total documents migrated.\n total_docs_migrated: u64,\n /// Whether the job is paused.\n paused: bool,\n}\n\n/// Configuration for the rebalancer worker.\n#[derive(Debug, Clone, Serialize, Deserialize)]\npub struct RebalancerWorkerConfig {\n /// Maximum concurrent migrations (plan §14.2 memory budget).\n pub max_concurrent_migrations: u32,\n /// Leader lease TTL in seconds.\n pub lease_ttl_secs: u64,\n /// Lease renewal interval in milliseconds.\n pub lease_renewal_interval_ms: u64,\n /// Migration batch size.\n pub migration_batch_size: u32,\n /// Delay between migration batches (ms).\n pub migration_batch_delay_ms: u64,\n /// Channel capacity for topology events.\n pub event_channel_capacity: usize,\n}\n\nimpl Default for RebalancerWorkerConfig {\n fn default() -> Self {\n Self {\n max_concurrent_migrations: 4,\n lease_ttl_secs: LEASE_TTL_SECS,\n lease_renewal_interval_ms: LEASE_RENEWAL_INTERVAL_MS,\n migration_batch_size: 1000,\n migration_batch_delay_ms: 100,\n event_channel_capacity: 100,\n }\n }\n}\n\n/// The rebalancer background worker.\n///\n/// Runs as a Tokio task, acquires a leader lease, and processes topology\n/// change events to drive shard migrations.\npub struct RebalancerWorker {\n config: RebalancerWorkerConfig,\n topology: Arc>,\n task_store: Arc,\n _rebalancer: Arc, // Reserved for future use\n migration_coordinator: Arc>,\n migration_executor: Option>,\n metrics: Arc>,\n pod_id: String,\n /// Sender for topology change events.\n event_tx: mpsc::Sender,\n /// Active rebalance jobs (per index).\n jobs: Arc>>,\n /// Receiver for topology change events (cloned for internal use).\n event_rx: Arc>>>,\n /// Callback for recording Prometheus metrics.\n metrics_callback: Option,\n}\n\nimpl RebalancerWorker {\n /// Create a new rebalancer worker.\n pub fn new(\n config: RebalancerWorkerConfig,\n topology: Arc>,\n task_store: Arc,\n rebalancer: Arc, // Reserved for future use\n migration_coordinator: Arc>,\n metrics: Arc>,\n pod_id: String,\n ) -> Self {\n Self::with_metrics(config, topology, task_store, rebalancer, migration_coordinator, metrics, pod_id, None)\n }\n\n /// Create a new rebalancer worker with metrics callback.\n pub fn with_metrics(\n config: RebalancerWorkerConfig,\n topology: Arc>,\n task_store: Arc,\n rebalancer: Arc, // Reserved for future use\n migration_coordinator: Arc>,\n metrics: Arc>,\n pod_id: String,\n metrics_callback: Option,\n ) -> Self {\n let (event_tx, event_rx) = mpsc::channel(config.event_channel_capacity);\n\n Self {\n config,\n topology,\n task_store,\n _rebalancer: rebalancer, // Stored but not currently used\n migration_coordinator,\n migration_executor: None, // Set via with_migration_executor\n metrics,\n pod_id,\n event_tx,\n jobs: Arc::new(RwLock::new(HashMap::new())),\n event_rx: Arc::new(RwLock::new(Some(event_rx))),\n metrics_callback,\n }\n }\n\n /// Set the migration executor (provides HTTP client for actual migrations).\n pub fn with_migration_executor(mut self, executor: Arc) -> Self {\n self.migration_executor = Some(executor);\n self\n }\n\n /// Get a sender for topology change events.\n pub fn event_sender(&self) -> mpsc::Sender {\n self.event_tx.clone()\n }\n\n /// Start the background worker.\n ///\n /// This runs in a loop:\n /// 1. Try to acquire leader lease for each index (scope: rebalance:)\n /// 2. If acquired, process events and run migrations\n /// 3. Renew lease periodically\n /// 4. If lease lost, go back to step 1\n pub async fn run(&self) {\n info!(\n pod_id = %self.pod_id,\n \"rebalancer worker starting\"\n );\n\n loop {\n // Try to acquire leader lease for each index we're managing\n let mut leader_scopes = Vec::new();\n\n // Get all active indexes from current jobs and use default scope\n let jobs = self.jobs.read().await;\n let mut index_uids: Vec = jobs.values()\n .map(|j| j.index_uid.clone())\n .collect();\n\n // Always include \"default\" scope for rebalancer operations\n index_uids.push(\"default\".to_string());\n drop(jobs);\n\n // Build scopes for each index: rebalance:\n let scopes: Vec = index_uids\n .into_iter()\n .map(|uid| format!(\"rebalance:{}\", uid))\n .collect();\n\n let mut acquired_any = false;\n for scope in &scopes {\n let now_ms = now_ms();\n let expires_at = now_ms + (self.config.lease_ttl_secs * 1000) as i64;\n\n match tokio::task::spawn_blocking({\n let task_store = self.task_store.clone();\n let scope = scope.clone();\n let pod_id = self.pod_id.clone();\n move || {\n task_store.try_acquire_leader_lease(&scope, &pod_id, expires_at, now_ms)\n }\n })\n .await\n {\n Ok(Ok(true)) => {\n info!(scope = %scope, pod_id = %self.pod_id, \"acquired leader lease\");\n leader_scopes.push(scope.clone());\n acquired_any = true;\n }\n Ok(Ok(false)) => {\n debug!(scope = %scope, \"leader lease already held\");\n }\n Ok(Err(e)) => {\n error!(scope = %scope, error = %e, \"failed to acquire leader lease\");\n }\n Err(e) => {\n error!(scope = %scope, error = %e, \"spawn_blocking task failed\");\n }\n }\n }\n\n if acquired_any {\n // We are the leader - update rebalancer metrics\n {\n let mut metrics = self.metrics.write().await;\n metrics.start_rebalance();\n }\n\n // Call metrics callback for rebalance start\n if let Some(ref callback) = self.metrics_callback {\n callback(true, None, None);\n }\n\n // We are the leader - run the main loop\n if let Err(e) = self.run_leader_loop(&leader_scopes).await {\n error!(error = %e, \"leader loop failed\");\n }\n\n // Clear rebalancer in-progress status on exit\n {\n let mut metrics = self.metrics.write().await;\n metrics.end_rebalance();\n }\n\n // Call metrics callback for rebalance end\n if let Some(ref callback) = self.metrics_callback {\n callback(false, None, None);\n }\n } else {\n // Not the leader - wait before retrying\n tokio::time::sleep(Duration::from_millis(\n self.config.lease_renewal_interval_ms,\n ))\n .await;\n }\n }\n }\n\n /// Run the leader loop: process events, renew lease, drive migrations.\n async fn run_leader_loop(&self, scopes: &[String]) -> Result<(), String> {\n let mut lease_renewal = tokio::time::interval(Duration::from_millis(\n self.config.lease_renewal_interval_ms,\n ));\n\n // Take the receiver out of the Option\n let mut event_rx = {\n let mut rx_guard = self.event_rx.write().await;\n rx_guard.take().ok_or_else(|| \"event receiver already taken\".to_string())?\n };\n\n let result = async {\n loop {\n tokio::select! {\n // Renew lease periodically\n _ = lease_renewal.tick() => {\n for scope in scopes {\n let now_ms = now_ms();\n let expires_at = now_ms + (self.config.lease_ttl_secs * 1000) as i64;\n\n match tokio::task::spawn_blocking({\n let task_store = self.task_store.clone();\n let scope = scope.clone();\n let pod_id = self.pod_id.clone();\n move || {\n task_store.renew_leader_lease(&scope, &pod_id, expires_at)\n }\n })\n .await\n {\n Ok(Ok(true)) => {\n debug!(scope = %scope, \"renewed leader lease\");\n }\n Ok(Ok(false)) => {\n info!(scope = %scope, \"lost leader lease\");\n return Ok::<(), String>(()); // Exit loop, will retry acquisition\n }\n Ok(Err(e)) => {\n error!(scope = %scope, error = %e, \"failed to renew lease\");\n return Err(format!(\"lease renewal failed: {}\", e));\n }\n Err(e) => {\n error!(scope = %scope, error = %e, \"spawn_blocking task failed\");\n return Err(format!(\"lease renewal task failed: {}\", e));\n }\n }\n }\n }\n\n // Process topology change events\n Some(event) = event_rx.recv() => {\n if let Err(e) = self.handle_topology_event(event).await {\n error!(error = %e, \"failed to handle topology event\");\n }\n }\n\n // Drive active migrations\n _ = tokio::time::sleep(Duration::from_millis(100)) => {\n if let Err(e) = self.drive_migrations().await {\n error!(error = %e, \"failed to drive migrations\");\n }\n }\n }\n }\n }.await;\n\n // Put the receiver back for retry logic\n {\n let mut rx_guard = self.event_rx.write().await;\n if rx_guard.is_none() {\n *rx_guard = Some(event_rx);\n }\n }\n\n result\n }\n\n /// Handle a topology change event.\n async fn handle_topology_event(&self, event: TopologyChangeEvent) -> Result<(), String> {\n info!(event = ?event, \"handling topology change event\");\n\n match event {\n TopologyChangeEvent::NodeAdded {\n node_id,\n replica_group,\n index_uid,\n } => {\n self.on_node_added(&node_id, replica_group, &index_uid)\n .await?\n }\n TopologyChangeEvent::NodeDraining {\n node_id,\n replica_group,\n index_uid,\n } => {\n self.on_node_draining(&node_id, replica_group, &index_uid)\n .await?\n }\n TopologyChangeEvent::NodeFailed {\n node_id,\n replica_group,\n index_uid,\n } => {\n self.on_node_failed(&node_id, replica_group, &index_uid)\n .await?\n }\n TopologyChangeEvent::NodeRecovered {\n node_id,\n replica_group,\n index_uid,\n } => {\n self.on_node_recovered(&node_id, replica_group, &index_uid)\n .await?\n }\n }\n\n Ok(())\n }\n\n /// Handle node addition: compute affected shards and create job to track migration.\n async fn on_node_added(\n &self,\n node_id: &str,\n replica_group: u32,\n index_uid: &str,\n ) -> Result<(), String> {\n let job_id = RebalanceJobId::new(index_uid);\n\n // Check if we already have a job for this index\n {\n let jobs = self.jobs.read().await;\n if jobs.contains_key(&job_id) {\n debug!(index_uid = %index_uid, \"rebalance job already exists\");\n return Ok(());\n }\n }\n\n // Compute affected shards using the Phase 1 router\n let affected_shards = self.compute_affected_shards_for_add(node_id, replica_group).await?;\n\n if affected_shards.is_empty() {\n info!(\n node_id = %node_id,\n replica_group = replica_group,\n \"no shards need migration for node addition\"\n );\n return Ok(());\n }\n\n info!(\n node_id = %node_id,\n replica_group = replica_group,\n shard_count = affected_shards.len(),\n \"computed affected shards for node addition\"\n );\n\n // Build migration state: shard -> old owner mapping\n let mut old_owners = HashMap::new();\n let mut shard_states = HashMap::new();\n for (shard_id, source_node) in &affected_shards {\n old_owners.insert(ShardId(*shard_id), topo_to_migration_node_id(source_node));\n shard_states.insert(\n *shard_id,\n ShardState {\n phase: ShardMigrationPhase::Idle,\n docs_migrated: 0,\n last_offset: 0,\n source_node: Some(source_node.to_string()),\n target_node: node_id.to_string(),\n started_at: Instant::now(),\n },\n );\n }\n\n // Create migration in coordinator for state tracking and dual-write\n let migration_id = {\n let mut coordinator = self.migration_coordinator.write().await;\n let new_node = topo_to_migration_node_id(&TopologyNodeId::new(node_id.to_string()));\n coordinator.begin_migration(new_node, replica_group, old_owners)\n .map_err(|e| format!(\"failed to create migration: {}\", e))?\n };\n\n // Start dual-write immediately so the router starts writing to both nodes\n {\n let mut coordinator = self.migration_coordinator.write().await;\n coordinator.begin_dual_write(migration_id)\n .map_err(|e| format!(\"failed to start dual-write: {}\", e))?;\n }\n\n let job = RebalanceJob {\n id: job_id.clone(),\n index_uid: index_uid.to_string(),\n replica_group,\n shards: shard_states,\n started_at: Instant::now(),\n completed_at: None,\n total_docs_migrated: 0,\n paused: false,\n };\n\n // Persist job to task store\n self.persist_job(&job).await?;\n\n // Store in memory\n let mut jobs = self.jobs.write().await;\n jobs.insert(job_id.clone(), job);\n\n info!(\n migration_id = %migration_id,\n shard_count = affected_shards.len(),\n \"created migration for node addition\"\n );\n\n Ok(())\n }\n\n /// Handle node draining: compute destination shards and create job to track migration.\n async fn on_node_draining(\n &self,\n node_id: &str,\n replica_group: u32,\n index_uid: &str,\n ) -> Result<(), String> {\n let job_id = RebalanceJobId::new(index_uid);\n\n // Compute shard destinations\n let shard_destinations = self\n .compute_shard_destinations_for_drain(node_id, replica_group)\n .await?;\n\n if shard_destinations.is_empty() {\n info!(\n node_id = %node_id,\n replica_group = replica_group,\n \"no shards need migration for node drain\"\n );\n return Ok(());\n }\n\n info!(\n node_id = %node_id,\n replica_group = replica_group,\n shard_count = shard_destinations.len(),\n \"computed shard destinations for node drain\"\n );\n\n // Build migration state: shard -> old owner (draining node) mapping\n let mut old_owners = HashMap::new();\n let mut shard_states = HashMap::new();\n for (shard_id, dest_node) in &shard_destinations {\n old_owners.insert(ShardId(*shard_id), topo_to_migration_node_id(&TopologyNodeId::new(node_id.to_string())));\n shard_states.insert(\n *shard_id,\n ShardState {\n phase: ShardMigrationPhase::Idle,\n docs_migrated: 0,\n last_offset: 0,\n source_node: Some(node_id.to_string()),\n target_node: dest_node.to_string(),\n started_at: Instant::now(),\n },\n );\n }\n\n // Create migration in coordinator for state tracking and dual-write\n let migration_id = {\n let mut coordinator = self.migration_coordinator.write().await;\n // For drain, the destination node becomes the \"new\" node in the migration\n if let Some((_, first_dest)) = shard_destinations.first() {\n let new_node = topo_to_migration_node_id(first_dest);\n coordinator.begin_migration(new_node, replica_group, old_owners)\n .map_err(|e| format!(\"failed to create migration: {}\", e))?\n } else {\n return Err(\"no shards to migrate\".to_string());\n }\n };\n\n // Start dual-write immediately\n {\n let mut coordinator = self.migration_coordinator.write().await;\n coordinator.begin_dual_write(migration_id)\n .map_err(|e| format!(\"failed to start dual-write: {}\", e))?;\n }\n\n let job = RebalanceJob {\n id: job_id.clone(),\n index_uid: index_uid.to_string(),\n replica_group,\n shards: shard_states,\n started_at: Instant::now(),\n completed_at: None,\n total_docs_migrated: 0,\n paused: false,\n };\n\n // Persist job to task store\n self.persist_job(&job).await?;\n\n // Store in memory\n let mut jobs = self.jobs.write().await;\n jobs.insert(job_id.clone(), job);\n\n info!(\n migration_id = %migration_id,\n shard_count = shard_destinations.len(),\n \"created migration for node drain\"\n );\n\n Ok(())\n }\n\n /// Handle node failure.\n async fn on_node_failed(\n &self,\n node_id: &str,\n replica_group: u32,\n index_uid: &str,\n ) -> Result<(), String> {\n info!(\n node_id = %node_id,\n replica_group = replica_group,\n index_uid = %index_uid,\n \"handling node failure\"\n );\n\n // Mark node as failed in topology\n let node_id_obj = TopologyNodeId::new(node_id.to_string());\n {\n let mut topo = self.topology.write().await;\n if let Some(node) = topo.node_mut(&node_id_obj) {\n node.status = crate::topology::NodeStatus::Failed;\n }\n }\n\n // TODO: Schedule replication to restore RF if needed\n // For now, just log the failure\n Ok(())\n }\n\n /// Handle node recovery.\n async fn on_node_recovered(\n &self,\n node_id: &str,\n replica_group: u32,\n index_uid: &str,\n ) -> Result<(), String> {\n info!(\n node_id = %node_id,\n replica_group = replica_group,\n index_uid = %index_uid,\n \"handling node recovery\"\n );\n\n // Mark node as active in topology\n let node_id_obj = TopologyNodeId::new(node_id.to_string());\n {\n let mut topo = self.topology.write().await;\n if let Some(node) = topo.node_mut(&node_id_obj) {\n node.status = crate::topology::NodeStatus::Active;\n }\n }\n\n // TODO: If auto_rebalance_on_recovery is enabled, trigger rebalancing\n\n Ok(())\n }\n\n /// Compute which shards are affected by adding a new node.\n /// Returns shard -> source_node mapping for shards that will move.\n async fn compute_affected_shards_for_add(\n &self,\n new_node_id: &str,\n replica_group: u32,\n ) -> Result, String> {\n let topo = self.topology.read().await;\n let new_node_id = TopologyNodeId::new(new_node_id.to_string());\n let rf = topo.rf();\n\n // Find the target group\n let group = topo\n .groups()\n .find(|g| g.id == replica_group)\n .ok_or_else(|| format!(\"replica group {} not found\", replica_group))?;\n\n let existing_nodes: Vec<_> = group.nodes().iter().cloned().collect();\n let mut affected_shards = Vec::new();\n\n // For each shard, check if adding the new node would change the assignment\n for shard_id in 0..topo.shards {\n let old_assignment: Vec<_> =\n assign_shard_in_group(shard_id, &existing_nodes, rf);\n\n // New assignment with the new node included\n let all_nodes: Vec<_> = existing_nodes\n .iter()\n .cloned()\n .chain(std::iter::once(new_node_id.clone()))\n .collect();\n let new_assignment: Vec<_> = assign_shard_in_group(shard_id, &all_nodes, rf);\n\n // Check if the new node is in the new assignment\n if new_assignment.contains(&new_node_id) {\n // This shard moves to the new node\n if let Some(old_owner) = old_assignment.first() {\n affected_shards.push((shard_id, old_owner.clone()));\n }\n }\n }\n\n Ok(affected_shards)\n }\n\n /// Compute where each shard should go when draining a node.\n /// Returns shard -> destination_node mapping.\n async fn compute_shard_destinations_for_drain(\n &self,\n drain_node_id: &str,\n replica_group: u32,\n ) -> Result, String> {\n let topo = self.topology.read().await;\n let drain_node_id = TopologyNodeId::new(drain_node_id.to_string());\n let rf = topo.rf();\n\n // Find the target group\n let group = topo\n .groups()\n .find(|g| g.id == replica_group)\n .ok_or_else(|| format!(\"replica group {} not found\", replica_group))?;\n\n let other_nodes: Vec<_> = group\n .nodes()\n .iter()\n .filter(|n| **n != drain_node_id)\n .cloned()\n .collect();\n\n if other_nodes.is_empty() {\n return Err(\"cannot remove last node in group\".to_string());\n }\n\n let mut destinations = Vec::new();\n\n // For each shard, find a new owner among the remaining nodes\n for shard_id in 0..topo.shards {\n let assignment: Vec<_> = assign_shard_in_group(shard_id, group.nodes(), rf);\n\n if assignment.contains(&drain_node_id) {\n // This shard needs a new home\n let mut best_node = None;\n let mut best_score = 0u64;\n\n for node in &other_nodes {\n let s = crate::router::score(shard_id, node.as_str());\n if s > best_score {\n best_score = s;\n best_node = Some(node.clone());\n }\n }\n\n if let Some(dest) = best_node {\n destinations.push((shard_id, dest));\n }\n }\n }\n\n Ok(destinations)\n }\n\n /// Drive active migrations forward.\n async fn drive_migrations(&self) -> Result<(), String> {\n let jobs = self.jobs.read().await;\n let mut active_jobs = Vec::new();\n\n for (job_id, job) in jobs.iter() {\n if job.paused || job.completed_at.is_some() {\n continue;\n }\n\n // Count how many shards are actively migrating\n let migrating_count = job\n .shards\n .values()\n .filter(|s| {\n matches!(\n s.phase,\n ShardMigrationPhase::MigrationInProgress\n | ShardMigrationPhase::DualWriteStarted\n )\n })\n .count();\n\n if migrating_count < self.config.max_concurrent_migrations as usize {\n active_jobs.push((job_id.clone(), job.clone()));\n }\n }\n\n // Drop read lock before processing\n drop(jobs);\n\n // Process up to max_concurrent_migrations jobs\n for (job_id, job) in active_jobs\n .into_iter()\n .take(self.config.max_concurrent_migrations as usize)\n {\n if let Err(e) = self.process_job(&job_id).await {\n error!(job_id = %job_id.0, error = %e, \"failed to process job\");\n }\n }\n\n Ok(())\n }\n\n /// Emit Prometheus metrics for the current rebalancer state.\n pub async fn emit_metrics(&self) {\n let jobs = self.jobs.read().await;\n\n // Calculate total documents migrated across all jobs\n let total_docs: u64 = jobs.values()\n .map(|j| j.total_docs_migrated)\n .sum();\n\n // Check if any rebalance is in progress\n let in_progress = jobs.values().any(|j| j.completed_at.is_none() && !j.paused);\n\n drop(jobs);\n\n // Update internal metrics\n {\n let mut metrics = self.metrics.write().await;\n if in_progress {\n metrics.start_rebalance();\n } else {\n metrics.end_rebalance();\n }\n // Note: documents_migrated_total is already tracked in RebalancerMetrics\n // and synced to Prometheus via the health checker\n let _ = total_docs;\n }\n\n // Call metrics callback for rebalance status\n if let Some(ref callback) = self.metrics_callback {\n callback(in_progress, None, None);\n }\n }\n\n /// Get the current rebalancer status for monitoring.\n pub async fn get_status(&self) -> RebalancerWorkerStatus {\n let jobs = self.jobs.read().await;\n\n let active_jobs = jobs.values()\n .filter(|j| j.completed_at.is_none() && !j.paused)\n .count();\n\n let completed_jobs = jobs.values()\n .filter(|j| j.completed_at.is_some())\n .count();\n\n let paused_jobs = jobs.values()\n .filter(|j| j.paused)\n .count();\n\n let total_shards: usize = jobs.values()\n .map(|j| j.shards.len())\n .sum();\n\n let completed_shards: usize = jobs.values()\n .map(|j| j.shards.values().filter(|s| s.phase == ShardMigrationPhase::OldReplicaDeleted).count())\n .sum();\n\n RebalancerWorkerStatus {\n active_jobs,\n completed_jobs,\n paused_jobs,\n total_shards,\n completed_shards,\n }\n }\n\n /// Process a single rebalance job.\n ///\n /// Drives the migration state machine forward for each shard in the job.\n /// This is the core method that advances migrations through their phases.\n async fn process_job(&self, job_id: &RebalanceJobId) -> Result<(), String> {\n // Get job (cloned to avoid holding lock)\n let job = {\n let jobs = self.jobs.read().await;\n jobs.get(job_id).cloned()\n };\n\n let mut job = match job {\n Some(j) => j,\n None => return Ok(()), // Job may have been removed\n };\n\n // Skip paused or completed jobs\n if job.paused || job.completed_at.is_some() {\n return Ok(());\n }\n\n // Sync worker job state with MigrationCoordinator state\n // This ensures we resume from the correct phase after a pod restart\n self.sync_job_with_coordinator(&mut job).await?;\n\n // Get the migration from the coordinator for this job\n let migration_id = {\n let coordinator = self.migration_coordinator.read().await;\n let mut found_id = None;\n for (mid, state) in coordinator.get_all_migrations() {\n // Match by index_uid and replica_group\n if state.replica_group == job.replica_group {\n found_id = Some(*mid);\n break;\n }\n }\n found_id.ok_or_else(|| \"no migration found for this job\".to_string())?\n };\n\n // Get migration state to access node addresses\n let (new_node, old_owners) = {\n let coordinator = self.migration_coordinator.read().await;\n let state = coordinator.get_state(migration_id)\n .ok_or_else(|| \"migration state not found\".to_string())?;\n (state.new_node.clone(), state.old_owners.clone())\n };\n\n // Get node addresses from topology\n let (new_node_address, old_owner_addresses) = {\n let topo = self.topology.read().await;\n let new_addr = topo.node(&migration_to_topo_node_id(&new_node))\n .ok_or_else(|| format!(\"new node not found: {}\", new_node.0))?\n .address.clone();\n\n let mut old_addrs = HashMap::new();\n for (shard, old_node) in &old_owners {\n if let Some(node) = topo.node(&migration_to_topo_node_id(old_node)) {\n old_addrs.insert(*shard, node.address.clone());\n }\n }\n\n (new_addr, old_addrs)\n };\n\n // Use a default index for now - in production, this would come from config\n let index_uid = \"default\".to_string();\n\n // Drive migrations forward for each shard\n let mut updated = false;\n let mut total_docs_migrated = 0u64;\n\n // Limit concurrent migrations to stay within memory budget\n let mut active_count = 0;\n\n for (&shard_id, shard_state) in job.shards.iter_mut() {\n // Check concurrent migration limit\n if active_count >= self.config.max_concurrent_migrations as usize {\n break;\n }\n\n match shard_state.phase {\n ShardMigrationPhase::Idle => {\n // Already started dual-write in on_node_added/on_node_draining\n shard_state.phase = ShardMigrationPhase::DualWriteStarted;\n updated = true;\n }\n ShardMigrationPhase::DualWriteStarted => {\n // Start background migration\n if let Some(ref executor) = self.migration_executor {\n if let Some(old_address) = old_owner_addresses.get(&ShardId(shard_id)) {\n let old_node = old_owners.get(&ShardId(shard_id))\n .cloned()\n .unwrap_or_else(|| crate::migration::NodeId(\"unknown\".to_string()));\n if let Err(e) = self.execute_background_migration(\n executor,\n migration_id,\n shard_id,\n &old_node,\n old_address,\n &new_node.0,\n &new_node_address,\n &index_uid,\n ).await {\n error!(shard_id, error = %e, \"failed to execute background migration\");\n shard_state.phase = ShardMigrationPhase::Failed;\n } else {\n shard_state.phase = ShardMigrationPhase::MigrationInProgress;\n active_count += 1;\n updated = true;\n }\n }\n } else {\n // No executor - skip directly to complete for testing\n shard_state.docs_migrated = 1000; // Simulated\n shard_state.phase = ShardMigrationPhase::MigrationComplete;\n updated = true;\n }\n }\n ShardMigrationPhase::MigrationInProgress => {\n // Check if migration is complete by querying the coordinator\n let complete = self.check_migration_complete_for_shard(shard_id).await?;\n if complete {\n shard_state.phase = ShardMigrationPhase::MigrationComplete;\n active_count -= 1; // One less active migration\n updated = true;\n }\n }\n ShardMigrationPhase::MigrationComplete => {\n // Begin cutover sequence\n if let Err(e) = self.begin_cutover_for_shard(shard_id).await {\n error!(shard_id, error = %e, \"failed to begin cutover\");\n } else {\n shard_state.phase = ShardMigrationPhase::DualWriteStopped;\n updated = true;\n }\n }\n ShardMigrationPhase::DualWriteStopped => {\n // Complete cutover and delete old replica\n if let Err(e) = self.complete_cutover_for_shard(shard_id).await {\n error!(shard_id, error = %e, \"failed to complete cutover\");\n } else {\n shard_state.phase = ShardMigrationPhase::OldReplicaDeleted;\n updated = true;\n }\n }\n ShardMigrationPhase::OldReplicaDeleted => {\n // Migration complete for this shard\n }\n ShardMigrationPhase::Failed => {\n // Migration failed - skip this shard\n }\n }\n\n total_docs_migrated += shard_state.docs_migrated;\n }\n\n // Update total docs migrated for the job\n job.total_docs_migrated = total_docs_migrated;\n\n // Update metrics\n {\n let mut metrics = self.metrics.write().await;\n metrics.record_documents_migrated(total_docs_migrated);\n }\n\n // Call metrics callback for documents migrated\n if let Some(ref callback) = self.metrics_callback {\n callback(false, Some(total_docs_migrated), None);\n }\n\n // Check if job is complete (all shards in final state)\n let all_complete = job.shards.values().all(|s| {\n matches!(s.phase, ShardMigrationPhase::OldReplicaDeleted | ShardMigrationPhase::Failed)\n });\n\n if all_complete && job.completed_at.is_none() {\n job.completed_at = Some(Instant::now());\n\n // Record final duration metric\n let duration = job.started_at.elapsed().as_secs_f64();\n {\n let mut metrics = self.metrics.write().await;\n metrics.end_rebalance();\n info!(\n job_id = %job_id.0,\n duration_secs = duration,\n \"rebalance job completed\"\n );\n }\n\n // Call metrics callback for rebalance completion with duration\n if let Some(ref callback) = self.metrics_callback {\n callback(false, None, Some(duration));\n }\n\n // Update job in memory\n let mut jobs = self.jobs.write().await;\n jobs.insert(job_id.clone(), job.clone());\n\n // Persist to task store\n self.persist_job(&job).await?;\n\n // Persist progress for each shard\n for shard_id in job.shards.keys() {\n self.persist_job_progress(&job, *shard_id).await?;\n }\n }\n\n Ok(())\n }\n\n /// Persist a job to the task store.\n async fn persist_job(&self, job: &RebalanceJob) -> Result<(), String> {\n let progress = serde_json::to_string(job)\n .map_err(|e| format!(\"failed to serialize job: {}\", e))?;\n\n let new_job = NewJob {\n id: job.id.0.clone(),\n type_: \"rebalance\".to_string(),\n params: progress,\n state: if job.completed_at.is_some() {\n \"completed\".to_string()\n } else if job.paused {\n \"paused\".to_string()\n } else {\n \"running\".to_string()\n },\n progress: format!(\n \"{{\\\"total_shards\\\":{},\\\"completed\\\":{},\\\"docs_migrated\\\":{}}}\",\n job.shards.len(),\n job.shards\n .values()\n .filter(|s| s.phase == ShardMigrationPhase::OldReplicaDeleted)\n .count(),\n job.total_docs_migrated\n ),\n };\n\n tokio::task::spawn_blocking({\n let task_store = self.task_store.clone();\n let new_job = new_job.clone();\n move || {\n task_store.insert_job(&new_job)\n }\n })\n .await\n .map_err(|e| format!(\"failed to persist job: {}\", e))?\n .map_err(|e| format!(\"failed to persist job: {}\", e))?;\n\n Ok(())\n }\n\n /// Persist progress for a single shard.\n async fn persist_job_progress(\n &self,\n job: &RebalanceJob,\n shard_id: u32,\n ) -> Result<(), String> {\n if let Some(shard_state) = job.shards.get(&shard_id) {\n let progress = ShardMigrationProgress {\n shard_id,\n phase: format!(\"{:?}\", shard_state.phase),\n docs_migrated: shard_state.docs_migrated,\n last_offset: shard_state.last_offset,\n source_node: shard_state.source_node.clone(),\n target_node: shard_state.target_node.clone(),\n };\n\n let progress_json =\n serde_json::to_string(&progress)\n .map_err(|e| format!(\"failed to serialize progress: {}\", e))?;\n\n // Update job progress in task store\n tokio::task::spawn_blocking({\n let task_store = self.task_store.clone();\n let job_id = job.id.0.clone();\n let completed_at = format!(\"{:?}\", job.completed_at.is_some());\n let progress_json = progress_json.clone();\n move || {\n task_store.update_job_progress(&job_id, &completed_at, &progress_json)\n }\n })\n .await\n .map_err(|e| format!(\"failed to update job progress: {}\", e))?\n .map_err(|e| format!(\"failed to update job progress: {}\", e))?;\n }\n\n Ok(())\n }\n\n /// Sync worker job state with MigrationCoordinator state.\n ///\n /// This ensures that after a pod restart, the worker's job state reflects\n /// the actual migration state tracked by the coordinator.\n async fn sync_job_with_coordinator(&self, job: &mut RebalanceJob) -> Result<(), String> {\n let coordinator = self.migration_coordinator.read().await;\n\n // For each shard in the job, check if there's a corresponding migration\n // in the coordinator and sync the state\n for (&shard_id, shard_state) in job.shards.iter_mut() {\n let shard = ShardId(shard_id);\n\n // Look for a migration in the coordinator that affects this shard\n for (_mid, migration_state) in coordinator.get_all_migrations() {\n if let Some(migration_shard_state) = migration_state.affected_shards.get(&shard) {\n // Sync the phase based on the migration coordinator state\n use crate::migration::ShardMigrationState as CoordinatorState;\n shard_state.phase = match migration_shard_state {\n CoordinatorState::Pending => ShardMigrationPhase::Idle,\n CoordinatorState::Migrating { .. } => ShardMigrationPhase::MigrationInProgress,\n CoordinatorState::MigrationComplete { docs_copied } => {\n shard_state.docs_migrated = *docs_copied;\n ShardMigrationPhase::MigrationComplete\n }\n CoordinatorState::Draining { .. } => ShardMigrationPhase::DualWriteStopped,\n CoordinatorState::DeltaPass { docs_copied, delta_docs_copied } => {\n shard_state.docs_migrated = docs_copied + delta_docs_copied;\n ShardMigrationPhase::DualWriteStopped\n }\n CoordinatorState::Active => ShardMigrationPhase::OldReplicaDeleted,\n CoordinatorState::Failed { .. } => ShardMigrationPhase::Failed,\n };\n }\n }\n }\n\n Ok(())\n }\n\n /// Start dual-write phase for a shard.\n async fn start_dual_write_for_shard(&self, _replica_group: u32, shard_id: u32) -> Result<(), String> {\n let shard = ShardId(shard_id);\n let mut coordinator = self.migration_coordinator.write().await;\n\n // Find or create the migration for this shard\n // For now, we'll create a new migration if one doesn't exist\n // In production, this would be created when the job is created\n\n info!(\n shard_id,\n \"starting dual-write phase\"\n );\n\n // The dual-write is handled by the router checking is_dual_write_active\n // We just need to ensure the migration coordinator knows about this shard\n Ok(())\n }\n\n /// Begin cutover sequence for a shard.\n async fn begin_cutover_for_shard(&self, shard_id: u32) -> Result<(), String> {\n info!(\n shard_id,\n \"beginning cutover sequence\"\n );\n\n let shard = ShardId(shard_id);\n let mut coordinator = self.migration_coordinator.write().await;\n\n // Collect the migrations that affect this shard first\n let migrations_to_cutover: Vec<_> = coordinator.get_all_migrations()\n .iter()\n .filter(|(_, migration_state)| migration_state.affected_shards.contains_key(&shard))\n .map(|(mid, _)| *mid)\n .collect();\n\n // Now perform the cutover\n for mid in migrations_to_cutover {\n coordinator.begin_cutover(mid).map_err(|e| e.to_string())?;\n break; // Only need to cutover one migration per shard\n }\n\n Ok(())\n }\n\n /// Complete cutover and delete old replica for a shard.\n async fn complete_cutover_for_shard(&self, shard_id: u32) -> Result<(), String> {\n info!(\n shard_id,\n \"completing cutover and deleting old replica\"\n );\n\n let shard = ShardId(shard_id);\n let mut coordinator = self.migration_coordinator.write().await;\n\n // Collect the migrations that affect this shard first\n let migrations_to_complete: Vec<_> = coordinator.get_all_migrations()\n .iter()\n .filter(|(_, migration_state)| migration_state.affected_shards.contains_key(&shard))\n .map(|(mid, _)| *mid)\n .collect();\n\n // Now complete the cleanup\n for mid in migrations_to_complete {\n coordinator.complete_drain(mid).map_err(|e| e.to_string())?;\n coordinator.complete_cleanup(mid).map_err(|e| e.to_string())?;\n break; // Only need to complete one migration per shard\n }\n\n Ok(())\n }\n\n /// Start background migration for a shard.\n async fn start_background_migration_for_shard(&self, shard_id: u32) -> Result<(), String> {\n info!(\n shard_id,\n \"starting background migration\"\n );\n\n // The actual migration is handled by the Rebalancer component's migration executor\n // This method just signals that we're ready for background migration to proceed\n Ok(())\n }\n\n /// Check if migration is complete for a shard.\n async fn check_migration_complete_for_shard(&self, shard_id: u32) -> Result {\n let shard = ShardId(shard_id);\n let coordinator = self.migration_coordinator.read().await;\n\n // Check if the migration coordinator has marked this shard as complete\n for (_mid, migration_state) in coordinator.get_all_migrations() {\n if let Some(shard_state) = migration_state.affected_shards.get(&shard) {\n use crate::migration::ShardMigrationState as CoordinatorState;\n if matches!(shard_state, CoordinatorState::MigrationComplete { .. }) {\n return Ok(true);\n }\n }\n }\n\n Ok(false)\n }\n\n /// Execute background migration for a shard.\n ///\n /// This performs the actual document migration from source to target node\n /// using pagination to stay within memory bounds.\n async fn execute_background_migration(\n &self,\n executor: &Arc,\n migration_id: MigrationId,\n shard_id: u32,\n old_node_id: &MigrationNodeId,\n old_address: &str,\n new_node_id: &str,\n new_address: &str,\n index_uid: &str,\n ) -> Result<(), String> {\n info!(\n migration_id = %migration_id,\n shard_id,\n from = %old_node_id.0,\n to = %new_node_id,\n \"starting shard migration\"\n );\n\n // Paginate through all documents for this shard\n let mut offset = 0u32;\n let limit = self.config.migration_batch_size;\n let mut total_docs_copied = 0u64;\n\n loop {\n // Fetch documents from source\n let (docs, _total) = executor.fetch_documents(\n &old_node_id.0,\n old_address,\n index_uid,\n shard_id,\n limit,\n offset,\n ).await.map_err(|e| format!(\"fetch failed: {}\", e))?;\n\n if docs.is_empty() {\n break; // No more documents\n }\n\n // Write documents to target\n executor.write_documents(\n new_node_id,\n new_address,\n index_uid,\n docs.clone(),\n ).await.map_err(|e| format!(\"write failed: {}\", e))?;\n\n total_docs_copied += docs.len() as u64;\n offset += limit;\n\n // Throttle if configured\n if self.config.migration_batch_delay_ms > 0 {\n tokio::time::sleep(Duration::from_millis(\n self.config.migration_batch_delay_ms,\n ))\n .await;\n }\n }\n\n // Mark shard migration complete in coordinator\n {\n let mut coordinator = self.migration_coordinator.write().await;\n coordinator.shard_migration_complete(migration_id, ShardId(shard_id), total_docs_copied)\n .map_err(|e| format!(\"failed to mark shard complete: {}\", e))?;\n }\n\n // Update metrics\n {\n let mut metrics = self.metrics.write().await;\n metrics.record_documents_migrated(total_docs_copied);\n }\n\n // Call metrics callback for documents migrated\n if let Some(ref callback) = self.metrics_callback {\n callback(false, Some(total_docs_copied), None);\n }\n\n info!(\n migration_id = %migration_id,\n shard_id,\n docs_copied = total_docs_copied,\n \"shard migration complete\"\n );\n\n Ok(())\n }\n\n /// Pause an in-progress rebalance.\n\n /// Pause an in-progress rebalance.\n pub async fn pause_rebalance(&self, index_uid: &str) -> Result<(), String> {\n let job_id = RebalanceJobId::new(index_uid);\n let mut jobs = self.jobs.write().await;\n\n if let Some(job) = jobs.get_mut(&job_id) {\n job.paused = true;\n info!(index_uid = %index_uid, \"paused rebalance\");\n Ok(())\n } else {\n Err(format!(\"no rebalance job found for index {}\", index_uid))\n }\n }\n\n /// Resume a paused rebalance.\n pub async fn resume_rebalance(&self, index_uid: &str) -> Result<(), String> {\n let job_id = RebalanceJobId::new(index_uid);\n let mut jobs = self.jobs.write().await;\n\n if let Some(job) = jobs.get_mut(&job_id) {\n job.paused = false;\n info!(index_uid = %index_uid, \"resumed rebalance\");\n Ok(())\n } else {\n Err(format!(\"no rebalance job found for index {}\", index_uid))\n }\n }\n\n /// Load persisted jobs from task store on startup.\n pub async fn load_persisted_jobs(&self) -> Result<(), String> {\n let jobs = tokio::task::spawn_blocking({\n let task_store = self.task_store.clone();\n move || {\n task_store.list_jobs_by_state(\"running\")\n }\n })\n .await\n .map_err(|e| format!(\"failed to list jobs: {}\", e))?\n .map_err(|e| format!(\"failed to list jobs: {}\", e))?;\n\n for job_row in jobs {\n if job_row.type_ == \"rebalance\" {\n if let Ok(job) = serde_json::from_str::(&job_row.params) {\n info!(\n index_uid = %job.index_uid,\n \"loaded persisted rebalance job\"\n );\n let mut jobs = self.jobs.write().await;\n jobs.insert(job.id.clone(), job);\n }\n }\n }\n\n Ok(())\n }\n}\n\n/// Status of the rebalancer worker for monitoring.\n#[derive(Debug, Clone, Serialize, Deserialize)]\npub struct RebalancerWorkerStatus {\n /// Number of active rebalance jobs.\n pub active_jobs: usize,\n /// Number of completed rebalance jobs.\n pub completed_jobs: usize,\n /// Number of paused rebalance jobs.\n pub paused_jobs: usize,\n /// Total number of shards across all jobs.\n pub total_shards: usize,\n /// Number of completed shard migrations.\n pub completed_shards: usize,\n}\n\n/// Get current time in milliseconds since Unix epoch.\nfn now_ms() -> i64 {\n std::time::SystemTime::now()\n .duration_since(std::time::UNIX_EPOCH)\n .unwrap_or_default()\n .as_millis() as i64\n}\n\n/// Convert a topology NodeId to a migration NodeId.\nfn topo_to_migration_node_id(id: &TopologyNodeId) -> MigrationNodeId {\n crate::migration::NodeId(id.as_str().to_string())\n}\n\n/// Convert a migration NodeId to a topology NodeId.\nfn migration_to_topo_node_id(id: &MigrationNodeId) -> TopologyNodeId {\n TopologyNodeId::new(id.0.clone())\n}\n\n/// Get the old node owner for a specific shard.\nfn old_node_owners_for_shard(old_owners: &HashMap, shard_id: u32) -> MigrationNodeId {\n old_owners.get(&ShardId(shard_id))\n .cloned()\n .unwrap_or_else(|| crate::migration::NodeId(\"unknown\".to_string()))\n}\n\n#[cfg(test)]\nmod tests {\n use super::*;\n use crate::config::MiroirConfig;\n use crate::migration::MigrationConfig;\n use crate::topology::Node;\n use std::sync::Arc;\n\n fn test_topology() -> Topology {\n let mut topo = Topology::new(64, 2, 2);\n topo.add_node(Node::new(\n TopologyNodeId::new(\"node-0\".into()),\n \"http://node-0:7700\".into(),\n 0,\n ));\n topo.add_node(Node::new(\n TopologyNodeId::new(\"node-1\".into()),\n \"http://node-1:7700\".into(),\n 0,\n ));\n topo.add_node(Node::new(\n TopologyNodeId::new(\"node-2\".into()),\n \"http://node-2:7700\".into(),\n 1,\n ));\n topo.add_node(Node::new(\n TopologyNodeId::new(\"node-3\".into()),\n \"http://node-3:7700\".into(),\n 1,\n ));\n topo\n }\n\n #[test]\n fn test_rebalance_job_id() {\n let job_id = RebalanceJobId::new(\"test-index\");\n assert_eq!(job_id.0, \"rebalance:test-index\");\n assert_eq!(job_id.index_uid(), \"test-index\");\n }\n\n #[test]\n fn test_worker_config_default() {\n let config = RebalancerWorkerConfig::default();\n assert_eq!(config.max_concurrent_migrations, 4);\n assert_eq!(config.lease_ttl_secs, LEASE_TTL_SECS);\n assert_eq!(config.lease_renewal_interval_ms, LEASE_RENEWAL_INTERVAL_MS);\n }\n\n #[tokio::test]\n async fn test_compute_affected_shards_for_add() {\n let topo = Arc::new(RwLock::new(test_topology()));\n let config = RebalancerWorkerConfig::default();\n\n // Create a mock task store (in-memory for testing)\n // Note: This would need a proper mock TaskStore implementation\n // For now, 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Cluster rebalancer for elastic topology operations.\n2\t//!\n3\t//! Implements plan §2 topology changes and §4 rebalancer:\n4\t//! - Node addition (within a group)\n5\t//! - Replica-group addition\n6\t//! - Node removal (drain)\n7\t//! - Group removal\n8\t//! - Unplanned node failure handling\n9\t//!\n10\t//! 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MigrationNodeId(id.as_str().to_string())\n30\t}\n31\t\n32\t/// Convert a migration NodeId to a topology NodeId.\n33\tfn migration_to_topo_node_id(id: &MigrationNodeId) -> TopologyNodeId {\n34\t TopologyNodeId::new(id.0.clone())\n35\t}\n36\t\n37\t/// Configuration for the rebalancer.\n38\t#[derive(Debug, Clone, Serialize, Deserialize)]\n39\tpub struct RebalancerConfig {\n40\t /// Maximum concurrent shard migrations.\n41\t pub max_concurrent_migrations: u32,\n42\t /// Timeout for a single migration operation.\n43\t pub migration_timeout_s: u64,\n44\t /// Whether to automatically rebalance on node recovery.\n45\t pub auto_rebalance_on_recovery: bool,\n46\t /// Batch size for document migration.\n47\t pub migration_batch_size: u32,\n48\t /// Delay between migration batches (ms).\n49\t pub migration_batch_delay_ms: u64,\n50\t}\n51\t\n52\timpl Default for RebalancerConfig {\n53\t fn default() -> Self {\n54\t Self {\n55\t max_concurrent_migrations: 4,\n56\t migration_timeout_s: 3600,\n57\t auto_rebalance_on_recovery: true,\n58\t migration_batch_size: 1000,\n59\t migration_batch_delay_ms: 100,\n60\t }\n61\t }\n62\t}\n63\t\n64\t/// Type of topology operation.\n65\t#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]\n66\t#[serde(rename_all = \"snake_case\")]\n67\tpub enum TopologyOperationType {\n68\t /// Adding a new node to an existing replica group.\n69\t AddNode,\n70\t /// Removing a node from a replica group.\n71\t RemoveNode,\n72\t /// Draining a node before removal.\n73\t DrainNode,\n74\t /// Adding a new replica group.\n75\t AddReplicaGroup,\n76\t /// Removing an entire replica group.\n77\t RemoveReplicaGroup,\n78\t /// Handling a failed node.\n79\t NodeFailure,\n80\t}\n81\t\n82\t/// Status of a topology operation.\n83\t#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]\n84\t#[serde(rename_all = \"snake_case\")]\n85\tpub enum TopologyOperationStatus {\n86\t /// Operation is pending.\n87\t Pending,\n88\t /// Operation is in progress.\n89\t InProgress,\n90\t /// Operation completed successfully.\n91\t Complete,\n92\t /// Operation failed.\n93\t Failed,\n94\t /// Operation was cancelled.\n95\t Cancelled,\n96\t}\n97\t\n98\t/// A topology operation (node/group add/remove/drain).\n99\t#[derive(Debug, Clone, Serialize, Deserialize)]\n100\tpub struct TopologyOperation {\n101\t /// Unique operation ID.\n102\t pub id: u64,\n103\t /// Type of operation.\n104\t pub op_type: TopologyOperationType,\n105\t /// Current status.\n106\t pub status: TopologyOperationStatus,\n107\t /// Target node ID (for node operations).\n108\t pub target_node: Option,\n109\t /// Target replica group ID (for group operations).\n110\t pub target_group: Option,\n111\t /// Shard migrations in progress for this operation.\n112\t pub migrations: Vec,\n113\t /// Start time.\n114\t pub started_at: Option,\n115\t /// Completion time.\n116\t pub completed_at: Option,\n117\t /// Error message if failed.\n118\t pub error: Option,\n119\t}\n120\t\n121\t/// Result of a topology operation request.\n122\t#[derive(Debug, Clone, Serialize, Deserialize)]\n123\tpub struct TopologyOperationResult {\n124\t /// Operation ID.\n125\t pub id: u64,\n126\t /// Status message.\n127\t pub message: String,\n128\t /// Number of shard migrations initiated.\n129\t pub migrations_count: usize,\n130\t}\n131\t\n132\t/// Status of all ongoing topology operations.\n133\t#[derive(Debug, Clone, Serialize, Deserialize)]\n134\tpub struct RebalanceStatus {\n135\t /// Whether a rebalance is currently in progress.\n136\t pub in_progress: bool,\n137\t /// Active topology operations.\n138\t pub operations: Vec,\n139\t /// Active migration details.\n140\t pub migrations: HashMap,\n141\t}\n142\t\n143\t/// Status of a single migration.\n144\t#[derive(Debug, Clone, Serialize, Deserialize)]\n145\tpub struct MigrationStatus {\n146\t /// Migration ID.\n147\t pub id: u64,\n148\t /// New node ID.\n149\t pub new_node: String,\n150\t /// Replica group.\n151\t pub replica_group: u32,\n152\t /// Current phase.\n153\t pub phase: String,\n154\t /// Affected shards count.\n155\t pub shards_count: usize,\n156\t /// Completed shards count.\n157\t pub completed_count: usize,\n158\t}\n159\t\n160\t/// Request to add a node to a replica group.\n161\t#[derive(Debug, Clone, Deserialize)]\n162\tpub struct AddNodeRequest {\n163\t /// Node ID.\n164\t pub id: String,\n165\t /// Node address.\n166\t pub address: String,\n167\t /// Replica group to join.\n168\t pub replica_group: u32,\n169\t}\n170\t\n171\t/// Request to remove a node from the cluster.\n172\t#[derive(Debug, Clone, Deserialize)]\n173\tpub struct RemoveNodeRequest {\n174\t /// Node ID to remove.\n175\t pub node_id: String,\n176\t /// Force removal without draining (dangerous).\n177\t pub force: bool,\n178\t}\n179\t\n180\t/// Request to drain a node (prepare for removal).\n181\t#[derive(Debug, Clone, Deserialize)]\n182\tpub struct DrainNodeRequest {\n183\t /// Node ID to 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Cluster rebalancer for elastic topology operations.\n//!\n//! Implements plan §2 topology changes and §4 rebalancer:\n//! - Node addition (within a group)\n//! - Replica-group addition\n//! - Node removal (drain)\n//! - Group removal\n//! - Unplanned node failure handling\n//!\n//! The rebalancer coordinates shard migrations using the migration coordinator\n//! and provides admin API endpoints for topology operations.\n\nuse crate::migration::{MigrationCoordinator, MigrationId, MigrationConfig, MigrationError, NodeId as MigrationNodeId, ShardId};\nuse crate::task_store::TaskStore;\nuse crate::topology::{Node, NodeId as TopologyNodeId, NodeStatus, Topology};\nuse crate::router::{assign_shard_in_group, score};\nuse serde::{Deserialize, Serialize};\nuse std::collections::HashMap;\nuse std::sync::Arc;\nuse std::time::{Duration, Instant};\nuse tokio::sync::RwLock;\nuse tracing::{debug, error, info, instrument, warn};\n\n/// Callback type for recording rebalancer metrics.\npub type RebalancerMetricsCallback = Arc;\n\n/// Convert a topology NodeId to a migration NodeId.\nfn topo_to_migration_node_id(id: &TopologyNodeId) -> MigrationNodeId {\n MigrationNodeId(id.as_str().to_string())\n}\n\n/// Convert a migration NodeId to a topology NodeId.\nfn migration_to_topo_node_id(id: &MigrationNodeId) -> TopologyNodeId {\n TopologyNodeId::new(id.0.clone())\n}\n\n/// Configuration for the rebalancer.\n#[derive(Debug, Clone, Serialize, Deserialize)]\npub struct RebalancerConfig {\n /// Maximum concurrent shard migrations.\n pub max_concurrent_migrations: u32,\n /// Timeout for a single migration operation.\n pub migration_timeout_s: u64,\n /// Whether to automatically rebalance on node recovery.\n pub auto_rebalance_on_recovery: bool,\n /// Batch size for document migration.\n pub migration_batch_size: u32,\n /// Delay between migration batches (ms).\n pub migration_batch_delay_ms: u64,\n}\n\nimpl Default for RebalancerConfig {\n fn default() -> Self {\n Self {\n max_concurrent_migrations: 4,\n migration_timeout_s: 3600,\n auto_rebalance_on_recovery: true,\n migration_batch_size: 1000,\n migration_batch_delay_ms: 100,\n }\n }\n}\n\n/// Type of topology operation.\n#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]\n#[serde(rename_all = \"snake_case\")]\npub enum TopologyOperationType {\n /// Adding a new node to an existing replica group.\n AddNode,\n /// Removing a node from a replica group.\n RemoveNode,\n /// Draining a node before removal.\n DrainNode,\n /// Adding a new replica group.\n AddReplicaGroup,\n /// Removing an entire replica group.\n RemoveReplicaGroup,\n /// Handling a failed node.\n NodeFailure,\n}\n\n/// Status of a topology operation.\n#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]\n#[serde(rename_all = \"snake_case\")]\npub enum TopologyOperationStatus {\n /// Operation is pending.\n Pending,\n /// Operation is in progress.\n InProgress,\n /// Operation completed successfully.\n Complete,\n /// Operation failed.\n Failed,\n /// Operation was cancelled.\n Cancelled,\n}\n\n/// A topology operation (node/group add/remove/drain).\n#[derive(Debug, Clone, Serialize, Deserialize)]\npub struct TopologyOperation {\n /// Unique operation ID.\n pub id: u64,\n /// Type of operation.\n pub op_type: TopologyOperationType,\n /// Current status.\n pub status: TopologyOperationStatus,\n /// Target node ID (for node operations).\n pub target_node: Option,\n /// Target replica group ID (for group operations).\n pub target_group: Option,\n /// Shard migrations in progress for this operation.\n pub migrations: Vec,\n /// Start time.\n pub started_at: Option,\n /// Completion time.\n pub completed_at: Option,\n /// Error message if failed.\n pub error: Option,\n}\n\n/// Result of a topology operation request.\n#[derive(Debug, Clone, Serialize, Deserialize)]\npub struct TopologyOperationResult {\n /// Operation ID.\n pub id: u64,\n /// Status message.\n pub message: String,\n /// Number of shard migrations initiated.\n pub migrations_count: usize,\n}\n\n/// Status of all ongoing topology operations.\n#[derive(Debug, Clone, Serialize, Deserialize)]\npub struct RebalanceStatus {\n /// Whether a rebalance is currently in progress.\n pub 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NodeId.\n33-fn migration_to_topo_node_id(id: &MigrationNodeId) -> TopologyNodeId {\n34- TopologyNodeId::new(id.0.clone())\n35-}\n36-\n37-/// Configuration for the rebalancer.\n38-#[derive(Debug, Clone, Serialize, Deserialize)]\n39-pub struct RebalancerConfig {\n40- /// Maximum concurrent shard migrations.\n41- pub max_concurrent_migrations: u32,\n42- /// Timeout for a single migration operation.\n43- pub migration_timeout_s: u64,\n44- /// Whether to automatically rebalance on node recovery.\n45- pub auto_rebalance_on_recovery: bool,\n46- /// Batch size for document migration.\n47- pub migration_batch_size: u32,\n48- /// Delay between migration batches (ms).\n49- pub migration_batch_delay_ms: u64,\n50-}\n51-\n52-impl Default for RebalancerConfig {\n53- fn default() -> Self {\n54- Self {\n55- max_concurrent_migrations: 4,\n--\n280:pub struct RebalancerMetrics {\n281- /// Total number of documents migrated.\n282- pub documents_migrated_total: u64,\n283- /// Number of currently active migrations.\n284- pub active_migrations: u64,\n285- /// Start time of the current rebalance operation.\n286- pub rebalance_start_time: Option,\n287-}\n288-\n289:impl RebalancerMetrics {\n290- /// Record that documents were migrated.\n291- pub fn record_documents_migrated(&mut self, count: u64) {\n292- self.documents_migrated_total += count;\n293- }\n294-\n295- /// Increment active migrations count.\n296- pub fn increment_active_migrations(&mut self) {\n297- self.active_migrations += 1;\n298- }\n299-\n300- /// Decrement active migrations count.\n301- pub fn decrement_active_migrations(&mut self) {\n302- self.active_migrations = self.active_migrations.saturating_sub(1);\n303- }\n304-\n305- /// Start a rebalance operation.\n306- pub fn start_rebalance(&mut self) {\n307- self.rebalance_start_time = Some(Instant::now());\n308- }\n309-\n310- /// End a rebalance operation and return duration in seconds.\n311- pub fn end_rebalance(&mut self) -> f64 {\n312- self.rebalance_start_time\n313- .take()\n314- .map(|t| t.elapsed().as_secs_f64())\n315- .unwrap_or(0.0)\n316- }\n317-\n318- /// Get the current rebalance duration in seconds.\n319- pub fn current_duration_secs(&self) -> f64 {\n--\n336: pub metrics: Arc>,\n337- /// Task store for leader lease (P4.1 background worker).\n338- task_store: Option>,\n339- /// This pod's ID for leader election.\n340- pod_id: Option,\n341- /// Leader lease scope prefix.\n342- leader_scope: String,\n343- /// Callback for recording Prometheus metrics.\n344: metrics_callback: Option,\n345-}\n346-\n347-impl Rebalancer {\n348- /// Create a new rebalancer.\n349- pub fn new(\n350- config: RebalancerConfig,\n351- topology: Arc>,\n352- migration_config: MigrationConfig,\n353- ) -> Self {\n354- let coordinator = Arc::new(RwLock::new(MigrationCoordinator::new(migration_config)));\n355-\n356- Self {\n357- config,\n358- topology,\n359- migration_coordinator: coordinator,\n360- operations: Arc::new(RwLock::new(HashMap::new())),\n361- next_op_id: Arc::new(std::sync::atomic::AtomicU64::new(1)),\n362- active_migrations: Arc::new(RwLock::new(HashMap::new())),\n363- migration_executor: None,\n364: metrics: Arc::new(RwLock::new(RebalancerMetrics::default())),\n365- task_store: None,\n366- pod_id: None,\n367- leader_scope: \"rebalance:global\".to_string(),\n368- metrics_callback: None,\n369- }\n370- }\n371-\n372- /// Set the task store for leader lease (P4.1 background worker).\n373- pub fn with_task_store(mut self, task_store: Arc) -> Self {\n374- self.task_store = Some(task_store);\n375- self\n376- }\n377-\n378- /// Set the pod ID for leader election.\n379- pub fn with_pod_id(mut self, pod_id: String) -> Self {\n380- self.pod_id = Some(pod_id);\n381- self\n382- }\n383-\n384- /// Set the leader lease scope.\n385- pub fn with_leader_scope(mut self, scope: String) -> Self {\n386- self.leader_scope = scope;\n387- self\n388- }\n389-\n390- /// Set the metrics callback for Prometheus emission.\n391: pub fn with_metrics_callback(mut self, callback: RebalancerMetricsCallback) -> Self {\n392- self.metrics_callback = Some(callback);\n393- self\n394- }\n395-\n396- /// Set the migration executor (provides HTTP client for actual migrations).\n397- pub fn with_migration_executor(mut self, executor: Arc) -> Self {\n398- self.migration_executor = Some(executor);\n399- self\n400- }\n401-\n402- /// Emit a metric via the metrics callback (if configured).\n403- fn emit_metric(&self, name: &str, value: f64) {\n404- if let Some(ref callback) = self.metrics_callback {\n405- callback(name, value);\n406- }\n407- }\n408-\n409- /// Run the background rebalancer worker (P4.1).\n410- ///\n411- /// This method runs in a loop, periodically checking for topology changes\n412- /// and triggering rebalancing as needed. Uses leader lease to ensure only\n413- /// one pod runs the rebalancer at a time.\n414- #[instrument(skip_all, fields(pod_id = ?self.pod_id))]\n415- pub async fn run_background(&self) -> Result<(), RebalancerError> {\n416- let Some(ref task_store) = self.task_store else {\n417- return Err(RebalancerError::InvalidState(\n418- \"task_store required for background worker\".into(),\n419- ));\n420- };\n421-\n--\n1275: metrics: Arc>,\n1276-) -> Result<(), RebalancerError> {\n1277- let Some(exec) = executor else {\n1278- // No executor - simulate completion for testing\n1279- for mid in migrations {\n1280- tokio::time::sleep(tokio::time::Duration::from_millis(\n1281- config.migration_batch_delay_ms,\n1282- ))\n1283- .await;\n1284-\n1285- let shards_to_complete = {\n1286- let coord = coordinator.read().await;\n1287- if let Some(state) = coord.get_state(mid) {\n1288- state.old_owners.keys().copied().collect::>()\n1289- } else {\n1290- continue;\n1291- }\n1292- };\n1293-\n1294- let docs_per_shard = 1000u64;\n1295- {\n1296- let mut coord = coordinator.write().await;\n1297- for shard in &shards_to_complete {\n1298- coord.shard_migration_complete(mid, *shard, docs_per_shard)?;\n1299- }\n1300- }\n1301-\n1302- // Record metrics for simulated migration\n1303- {\n1304- let mut metrics_guard = metrics.write().await;\n1305- metrics_guard.record_documents_migrated(docs_per_shard * shards_to_complete.len() as u64);\n--\n1576: metrics: Arc>,\n1577-) -> Result<(), RebalancerError> {\n1578- let Some(exec) = executor else {\n1579- // No executor - simulate completion for testing\n1580- for mid in migrations {\n1581- tokio::time::sleep(tokio::time::Duration::from_millis(\n1582- config.migration_batch_delay_ms,\n1583- ))\n1584- .await;\n1585-\n1586- let shards_to_complete = {\n1587- let coord = coordinator.read().await;\n1588- if let Some(state) = coord.get_state(mid) {\n1589- state.old_owners.keys().copied().collect::>()\n1590- } else {\n1591- continue;\n1592- }\n1593- 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migration_to_topo_node_id(id: &MigrationNodeId) -> TopologyNodeId {\n34- TopologyNodeId::new(id.0.clone())\n35-}\n36-\n37-/// Configuration for the rebalancer.\n38-#[derive(Debug, Clone, Serialize, Deserialize)]\n39-pub struct RebalancerConfig {\n40- /// Maximum concurrent shard migrations.\n41- pub max_concurrent_migrations: u32,\n42- /// Timeout for a single migration operation.\n43- pub migration_timeout_s: u64,\n44- /// Whether to automatically rebalance on node recovery.\n45- pub auto_rebalance_on_recovery: bool,\n46- /// Batch size for document migration.\n47- pub migration_batch_size: u32,\n48- /// Delay between migration batches (ms).\n49- pub migration_batch_delay_ms: u64,\n50-}\n51-\n52-impl Default for RebalancerConfig {\n53- fn default() -> Self {\n54- Self {\n55- max_concurrent_migrations: 4,\n--\n280:pub struct RebalancerMetrics {\n281- /// Total number of documents migrated.\n282- pub documents_migrated_total: u64,\n283- /// Number of currently active migrations.\n284- pub active_migrations: u64,\n285- /// Start time of the current rebalance operation.\n286- pub rebalance_start_time: Option,\n287-}\n288-\n289:impl RebalancerMetrics {\n290- /// Record that documents were migrated.\n291- pub fn record_documents_migrated(&mut self, count: u64) {\n292- self.documents_migrated_total += count;\n293- }\n294-\n295- /// Increment active migrations count.\n296- pub fn increment_active_migrations(&mut self) {\n297- self.active_migrations += 1;\n298- }\n299-\n300- /// Decrement active migrations count.\n301- pub fn decrement_active_migrations(&mut self) {\n302- self.active_migrations = self.active_migrations.saturating_sub(1);\n303- }\n304-\n305- /// Start a rebalance operation.\n306- pub fn start_rebalance(&mut self) {\n307- self.rebalance_start_time = Some(Instant::now());\n308- }\n309-\n310- /// End a rebalance operation and return duration in seconds.\n311- pub fn end_rebalance(&mut self) -> f64 {\n312- self.rebalance_start_time\n313- .take()\n314- .map(|t| t.elapsed().as_secs_f64())\n315- .unwrap_or(0.0)\n316- }\n317-\n318- /// Get the current rebalance duration in seconds.\n319- pub fn current_duration_secs(&self) -> f64 {\n--\n336: pub metrics: Arc>,\n337- /// Task store for leader lease (P4.1 background worker).\n338- task_store: Option>,\n339- /// This pod's ID for leader election.\n340- pod_id: Option,\n341- /// Leader lease scope prefix.\n342- leader_scope: String,\n343- /// Callback for recording Prometheus metrics.\n344: metrics_callback: Option,\n345-}\n346-\n347-impl Rebalancer {\n348- /// Create a new rebalancer.\n349- pub fn new(\n350- config: RebalancerConfig,\n351- topology: Arc>,\n352- migration_config: MigrationConfig,\n353- ) -> Self {\n354- let coordinator = Arc::new(RwLock::new(MigrationCoordinator::new(migration_config)));\n355-\n356- Self {\n357- config,\n358- topology,\n359- migration_coordinator: coordinator,\n360- operations: Arc::new(RwLock::new(HashMap::new())),\n361- next_op_id: Arc::new(std::sync::atomic::AtomicU64::new(1)),\n362- active_migrations: Arc::new(RwLock::new(HashMap::new())),\n363- migration_executor: None,\n364: metrics: Arc::new(RwLock::new(RebalancerMetrics::default())),\n365- task_store: None,\n366- pod_id: None,\n367- leader_scope: \"rebalance:global\".to_string(),\n368- metrics_callback: None,\n369- }\n370- }\n371-\n372- /// Set the task store for leader lease (P4.1 background worker).\n373- pub fn with_task_store(mut self, task_store: Arc) -> Self {\n374- self.task_store = Some(task_store);\n375- self\n376- }\n377-\n378- /// Set the pod ID for leader election.\n379- pub fn with_pod_id(mut self, pod_id: String) -> Self {\n380- self.pod_id = Some(pod_id);\n381- self\n382- }\n383-\n384- /// Set the leader lease scope.\n385- pub fn with_leader_scope(mut self, scope: String) -> Self {\n386- self.leader_scope = scope;\n387- self\n388- }\n389-\n390- /// Set the metrics callback for Prometheus emission.\n391: pub fn with_metrics_callback(mut self, callback: RebalancerMetricsCallback) -> Self {\n392- self.metrics_callback = Some(callback);\n393- self\n394- }\n395-\n396- /// Set the migration executor (provides HTTP client for actual migrations).\n397- pub fn with_migration_executor(mut self, executor: Arc) -> Self {\n398- self.migration_executor = Some(executor);\n399- self\n400- }\n401-\n402- /// Emit a metric via the metrics callback (if configured).\n403- fn emit_metric(&self, name: &str, value: f64) {\n404- if let Some(ref callback) = self.metrics_callback {\n405- callback(name, value);\n406- }\n407- }\n408-\n409- /// Run the background rebalancer worker (P4.1).\n410- ///\n411- /// This method runs in a loop, periodically checking for topology changes\n412- /// and triggering rebalancing as needed. 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+{"type":"stream_event","event":{"type":"content_block_stop","index":1},"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","parent_tool_use_id":null,"uuid":"e9b95d5a-d5d1-4879-805a-4daf0947d98e"} +{"type":"stream_event","event":{"type":"message_delta","delta":{"stop_reason":"tool_use","stop_sequence":null},"usage":{"input_tokens":862,"output_tokens":55,"cache_read_input_tokens":75776,"server_tool_use":{"web_search_requests":0},"service_tier":"standard"}},"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","parent_tool_use_id":null,"uuid":"d24fc50c-9b3c-4d79-bd73-0e30478057c4"} +{"type":"stream_event","event":{"type":"message_stop"},"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","parent_tool_use_id":null,"uuid":"30fdecc2-2fa2-4903-8c7a-eb8b26bc217f"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_74dc5cae1f214e4f9eaef8aa","type":"tool_result","content":"1\tuse axum::{\n2\t extract::FromRef,\n3\t routing::{get, post},\n4\t Router,\n5\t};\n6\tuse miroir_core::{\n7\t config::MiroirConfig,\n8\t peer_discovery::PeerDiscovery,\n9\t rebalancer_worker::{RebalancerWorker, RebalancerWorkerConfig, TopologyChangeEvent},\n10\t task_pruner,\n11\t topology::{NodeStatus, Topology},\n12\t};\n13\tuse std::net::SocketAddr;\n14\tuse std::time::Duration;\n15\tuse tokio::signal;\n16\tuse tracing::{error, info};\n17\tuse tracing_subscriber::{EnvFilter, layer::SubscriberExt, registry, util::SubscriberInitExt};\n18\t\n19\tmod admin_session;\n20\tmod auth;\n21\tmod client;\n22\tmod middleware;\n23\tmod otel;\n24\tmod routes;\n25\tmod scoped_key_rotation;\n26\t\n27\tuse admin_session::SealKey;\n28\tuse auth::AuthState;\n29\tuse miroir_core::{\n30\t canary::{CanaryAssertion, CanaryRunner, CapturedQuery, QueryCapture, SearchQuery, SearchResponse},\n31\t task_store::TaskStore,\n32\t};\n33\tuse middleware::{Metrics, metrics_router, TelemetryState};\n34\tuse routes::{\n35\t admin, admin_endpoints, explain, health, indexes, keys, multi_search, search, settings, tasks, version,\n36\t};\n37\tuse scoped_key_rotation::ScopedKeyRotationState;\n38\tuse std::sync::Arc;\n39\t\n40\t/// Unified application state containing all shared state.\n41\t#[derive(Clone)]\n42\tstruct UnifiedState {\n43\t auth: AuthState,\n44\t metrics: Metrics,\n45\t admin: admin_endpoints::AppState,\n46\t pod_id: String,\n47\t redis_store: Option,\n48\t query_capture: Arc,\n49\t peer_discovery: Option>,\n50\t}\n51\t\n52\timpl UnifiedState {\n53\t fn new(config: MiroirConfig) -> Self {\n54\t let metrics = Metrics::new(&config);\n55\t\n56\t let master_key = std::env::var(\"MIROIR_MASTER_KEY\")\n57\t .unwrap_or_else(|_| config.master_key.clone());\n58\t\n59\t let admin_key = std::env::var(\"MIROIR_ADMIN_API_KEY\")\n60\t .unwrap_or_else(|_| config.admin.api_key.clone());\n61\t\n62\t let jwt_primary = if config.search_ui.enabled {\n63\t std::env::var(&config.search_ui.auth.jwt_secret_env).ok()\n64\t } else {\n65\t None\n66\t };\n67\t\n68\t let jwt_previous = std::env::var(&config.search_ui.auth.jwt_secret_previous_env)\n69\t .ok()\n70\t .filter(|v| !v.is_empty());\n71\t\n72\t let seal_key = SealKey::from_env_or_generate();\n73\t\n74\t // Set the key-generated gauge before constructing AuthState\n75\t // so the metric is accurate from the first scrape.\n76\t metrics.admin_session_key_generated().set(if seal_key.is_generated() { 1.0 } else { 0.0 });\n77\t\n78\t let pod_id = std::env::var(\"POD_NAME\").unwrap_or_else(|_| \"unknown\".to_string());\n79\t let namespace = std::env::var(\"POD_NAMESPACE\").unwrap_or_else(|_| \"default\".to_string());\n80\t\n81\t // Create peer discovery instance (plan §14.5)\n82\t // Only enabled when running in Kubernetes (POD_NAME is set to a real pod name)\n83\t let peer_discovery = if pod_id != \"unknown\" {\n84\t Some(Arc::new(PeerDiscovery::new(\n85\t pod_id.clone(),\n86\t namespace,\n87\t config.peer_discovery.service_name.clone(),\n88\t )))\n89\t } else {\n90\t None\n91\t };\n92\t\n93\t // Create Redis task store if backend is redis (must happen before AppState\n94\t // so redis_store and pod_id are available to admin endpoints).\n95\t let redis_store = if config.task_store.backend == \"redis\" && !config.task_store.url.is_empty() {\n96\t let url = config.task_store.url.clone();\n97\t Some(\n98\t tokio::task::block_in_place(|| {\n99\t tokio::runtime::Handle::current().block_on(\n100\t miroir_core::task_store::RedisTaskStore::open(&url)\n101\t )\n102\t })\n103\t .expect(\"Failed to connect to Redis for scoped key rotation\"),\n104\t )\n105\t } else {\n106\t None\n107\t };\n108\t\n109\t let auth = AuthState {\n110\t master_key,\n111\t admin_key: admin_key.clone(),\n112\t jwt_primary,\n113\t jwt_previous,\n114\t seal_key: seal_key.clone(),\n115\t revoked_sessions: std::sync::Arc::new(dashmap::DashMap::new()),\n116\t admin_session_revoked_total: metrics.admin_session_revoked_total(),\n117\t };\n118\t\n119\t let admin = admin_endpoints::AppState::with_redis(\n120\t config.clone(),\n121\t metrics.clone(),\n122\t redis_store.clone(),\n123\t pod_id.clone(),\n124\t seal_key.clone(),\n125\t );\n126\t\n127\t Self {\n128\t auth,\n129\t metrics,\n130\t admin,\n131\t pod_id,\n132\t redis_store,\n133\t query_capture: Arc::new(QueryCapture::new(1000)),\n134\t peer_discovery,\n135\t }\n136\t }\n137\t}\n138\t\n139\t// Implement FromRef so that admin_endpoints::AppState can be extracted from UnifiedState\n140\timpl FromRef for admin_endpoints::AppState {\n141\t fn from_ref(state: &UnifiedState) -> Self {\n142\t Self {\n143\t config: state.admin.config.clone(),\n144\t topology: state.admin.topology.clone(),\n145\t ready: state.admin.ready.clone(),\n146\t metrics: state.admin.metrics.clone(),\n147\t version_state: state.admin.version_state.clone(),\n148\t task_registry: state.admin.task_registry.clone(),\n149\t redis_store: state.redis_store.clone(),\n150\t task_store: state.admin.task_store.clone(),\n151\t pod_id: state.pod_id.clone(),\n152\t seal_key: state.auth.seal_key.clone(),\n153\t local_rate_limiter: admin_endpoints::LocalAdminRateLimiter::new(),\n154\t local_search_ui_rate_limiter: admin_endpoints::LocalSearchUiRateLimiter::new(),\n155\t rebalancer: state.admin.rebalancer.clone(),\n156\t migration_coordinator: state.admin.migration_coordinator.clone(),\n157\t rebalancer_worker: state.admin.rebalancer_worker.clone(),\n158\t rebalancer_metrics: state.admin.rebalancer_metrics.clone(),\n159\t previous_docs_migrated: state.admin.previous_docs_migrated.clone(),\n160\t settings_broadcast: state.admin.settings_broadcast.clone(),\n161\t drift_reconciler: state.admin.drift_reconciler.clone(),\n162\t session_manager: state.admin.session_manager.clone(),\n163\t alias_registry: state.admin.alias_registry.clone(),\n164\t }\n165\t }\n166\t}\n167\t\n168\t// Implement FromRef so that TelemetryState can be extracted from UnifiedState\n169\timpl FromRef for TelemetryState {\n170\t fn from_ref(state: &UnifiedState) -> Self {\n171\t TelemetryState {\n172\t metrics: state.metrics.clone(),\n173\t pod_id: state.pod_id.clone(),\n174\t }\n175\t }\n176\t}\n177\t\n178\t// Implement FromRef so that CsrfState can be extracted from UnifiedState\n179\timpl FromRef for auth::CsrfState {\n180\t fn from_ref(state: &UnifiedState) -> Self {\n181\t auth::CsrfState {\n182\t auth: state.auth.clone(),\n183\t redis_store: state.redis_store.clone(),\n184\t }\n185\t }\n186\t}\n187\t\n188\t// Implement FromRef so that routes::aliases::AliasState can be extracted from UnifiedState\n189\timpl FromRef for routes::aliases::AliasState {\n190\t fn from_ref(state: &UnifiedState) -> Self {\n191\t Self {\n192\t config: state.admin.config.clone(),\n193\t task_store: state.admin.task_store.clone(),\n194\t metrics: state.metrics.clone(),\n195\t }\n196\t }\n197\t}\n198\t\n199\t// Implement FromRef so that routes::explain::ExplainState can be extracted from UnifiedState\n200\timpl FromRef for routes::explain::ExplainState {\n201\t fn from_ref(state: &UnifiedState) -> Self {\n202\t Self {\n203\t config: state.admin.config.clone(),\n204\t topology: state.admin.topology.clone(),\n205\t }\n206\t }\n207\t}\n208\t\n209\t// Implement FromRef so that routes::multi_search::MultiSearchState can be extracted from UnifiedState\n210\timpl FromRef for routes::multi_search::MultiSearchState {\n211\t fn from_ref(state: &UnifiedState) -> Self {\n212\t Self {\n213\t config: state.admin.config.clone(),\n214\t topology: state.admin.topology.clone(),\n215\t node_master_key: state.admin.config.master_key.clone(),\n216\t metrics: state.metrics.clone(),\n217\t alias_registry: state.admin.alias_registry.clone(),\n218\t }\n219\t }\n220\t}\n221\t\n222\t// Implement FromRef so that routes::canary::CanaryState can be extracted from UnifiedState\n223\timpl FromRef for routes::canary::CanaryState {\n224\t fn from_ref(state: &UnifiedState) -> Self {\n225\t // Canary routes require Redis task store\n226\t let redis_store = state.redis_store.clone()\n227\t .expect(\"Canary routes require Redis task store (task_store.backend: redis)\");\n228\t let store: Arc = Arc::from(redis_store);\n229\t Self {\n230\t store,\n231\t capture: state.query_capture.clone(),\n232\t }\n233\t }\n234\t}\n235\t\n236\t#[tokio::main]\n237\tasync fn main() -> anyhow::Result<()> {\n238\t // Load configuration (file → env → CLI overlay)\n239\t let config = MiroirConfig::load()\n240\t .map_err(|e| anyhow::anyhow!(\"Failed to load config: {}\", e))?;\n241\t\n242\t // Initialize structured JSON logging (plan §10 format)\n243\t // Fields on every line: timestamp, level, target, message, pod_id\n244\t // Per-request fields (request_id) are added by telemetry middleware span.\n245\t let filter = EnvFilter::try_from_default_env()\n246\t .unwrap_or_else(|_| EnvFilter::new(\"info\"));\n247\t\n248\t let pod_id = std::env::var(\"POD_NAME\").unwrap_or_else(|_| \"unknown\".to_string());\n249\t\n250\t // Build subscriber - conditionally add OTel layer\n251\t // Note: We rebuild the layers in each branch because the types differ\n252\t // OTel layer must be applied to the bare registry first\n253\t if let Some(otel_layer) = otel::init_otel_layer(&config) {\n254\t let json_layer = tracing_subscriber::fmt::layer()\n255\t .json()\n256\t .flatten_event(true)\n257\t .with_target(true)\n258\t .with_current_span(true)\n259\t .with_span_list(false);\n260\t // Apply OTel layer to registry first, then add filter and json layer\n261\t registry()\n262\t .with(otel_layer)\n263\t .with(filter)\n264\t .with(json_layer)\n265\t .init();\n266\t } else {\n267\t let json_layer = tracing_subscriber::fmt::layer()\n268\t .json()\n269\t .flatten_event(true)\n270\t .with_target(true)\n271\t .with_current_span(true)\n272\t .with_span_list(false);\n273\t registry()\n274\t .with(filter)\n275\t .with(json_layer)\n276\t .init();\n277\t }\n278\t\n279\t // Set pod_id as a global default field so it appears on every log line.\n280\t // This is done via a separate info span that is entered once and never\n281\t // left — its fields propagate to all child spans and events.\n282\t let _pod_span = tracing::info_span!(\"runtime\", pod_id = %pod_id).entered();\n283\t\n284\t info!(\n285\t shards = config.shards,\n286\t replication_factor = config.replication_factor,\n287\t replica_groups = config.replica_groups,\n288\t \"miroir-proxy starting\"\n289\t );\n290\t\n291\t // Validate critical secrets at startup (plan §9: \"orchestrator refuses to\n292\t // start the search UI without it\").\n293\t if config.search_ui.enabled {\n294\t let jwt_env = &config.search_ui.auth.jwt_secret_env;\n295\t match std::env::var(jwt_env) {\n296\t Ok(v) if !v.is_empty() => {}\n297\t _ => {\n298\t anyhow::bail!(\n299\t \"search_ui is enabled but {} is not set — refusing to start. \\\n300\t Either set the env var or disable search_ui (search_ui.enabled: false)\",\n301\t jwt_env\n302\t );\n303\t }\n304\t }\n305\t }\n306\t\n307\t // Build unified state\n308\t let state = UnifiedState::new(config.clone());\n309\t\n310\t // Start health checker background task\n311\t let health_checker_state = state.admin.clone();\n312\t tokio::spawn(async move {\n313\t run_health_checker(health_checker_state).await;\n314\t });\n315\t\n316\t // Start rebalancer worker background task (plan §4)\n317\t if let Some(ref worker) = state.admin.rebalancer_worker {\n318\t let worker = worker.clone();\n319\t let pod_id = state.pod_id.clone();\n320\t tokio::spawn(async move {\n321\t info!(\n322\t pod_id = %pod_id,\n323\t \"rebalancer worker task starting\"\n324\t );\n325\t // Load any persisted rebalance jobs from previous runs\n326\t if let Err(e) = worker.load_persisted_jobs().await {\n327\t error!(error = %e, \"failed to load persisted rebalance jobs\");\n328\t }\n329\t worker.run().await;\n330\t error!(\"rebalancer worker task exited unexpectedly\");\n331\t });\n332\t } else {\n333\t info!(\"rebalancer worker not available (no task store configured)\");\n334\t }\n335\t\n336\t // Start scoped key rotation background task (requires Redis)\n337\t if let Some(ref redis) = state.redis_store {\n338\t let rotation_state = ScopedKeyRotationState {\n339\t config: state.admin.config.clone(),\n340\t redis: redis.clone(),\n341\t pod_id: state.pod_id.clone(),\n342\t };\n343\t tokio::spawn(async move {\n344\t scoped_key_rotation::run_scoped_key_rotator(rotation_state).await;\n345\t });\n346\t\n347\t // Start admin session revocation Pub/Sub subscriber (plan §9).\n348\t // When any pod revokes a session (logout), the session ID is published\n349\t // to `miroir:admin_session:revoked`. Every pod subscribes and adds the\n350\t // ID to its in-memory DashMap, ensuring revoked cookies are rejected\n351\t // across all pods within milliseconds.\n352\t let revoked_sessions = state.auth.revoked_sessions.clone();\n353\t let revoked_total = state.auth.admin_session_revoked_total.clone();\n354\t let redis_url = config.task_store.url.clone();\n355\t let key_prefix = redis.key_prefix().to_string();\n356\t tokio::spawn(async move {\n357\t info!(\"starting admin session revocation subscriber\");\n358\t if let Err(e) = miroir_core::task_store::RedisTaskStore::subscribe_session_revocations(\n359\t &redis_url,\n360\t &key_prefix,\n361\t move |session_id: String| {\n362\t revoked_sessions.insert(session_id, ());\n363\t revoked_total.inc();\n364\t },\n365\t )\n366\t .await\n367\t {\n368\t error!(error = %e, \"admin session revocation subscriber exited with error\");\n369\t }\n370\t });\n371\t }\n372\t\n373\t // Load aliases from task store on startup (plan §13.7)\n374\t // Aliases must be loaded before any request routing to ensure consistent resolution\n375\t if let Some(ref task_store) = state.admin.task_store {\n376\t let alias_registry = state.admin.alias_registry.clone();\n377\t let store = task_store.clone();\n378\t tokio::spawn(async move {\n379\t info!(\"loading aliases from task store\");\n380\t match alias_registry.sync_from_store(&*store).await {\n381\t Ok(()) => {\n382\t let count = alias_registry.list().await.len();\n383\t info!(count, \"aliases loaded successfully\");\n384\t }\n385\t Err(e) => {\n386\t error!(error = %e, \"failed to load aliases from task store\");\n387\t }\n388\t }\n389\t });\n390\t } else {\n391\t info!(\"alias loading skipped (no task store configured)\");\n392\t }\n393\t\n394\t // Start drift reconciler background task (plan §13.5)\n395\t // Uses the drift_reconciler from AppState which is already configured\n396\t if let Some(ref drift_reconciler) = state.admin.drift_reconciler {\n397\t let drift_reconciler = drift_reconciler.clone();\n398\t tokio::spawn(async move {\n399\t info!(\"drift reconciler started\");\n400\t drift_reconciler.run().await;\n401\t error!(\"drift reconciler exited unexpectedly\");\n402\t });\n403\t } else {\n404\t info!(\"drift reconciler not available (no task store configured)\");\n405\t }\n406\t\n407\t // Start peer discovery refresh loop (plan §14.5)\n408\t // Periodically performs SRV lookups to discover peer pods\n409\t if let Some(ref peer_discovery) = state.peer_discovery {\n410\t let peer_discovery = peer_discovery.clone();\n411\t let metrics = state.metrics.clone();\n412\t let refresh_interval_s = config.peer_discovery.refresh_interval_s;\n413\t tokio::spawn(async move {\n414\t let mut interval = tokio::time::interval(Duration::from_secs(refresh_interval_s));\n415\t info!(\n416\t interval_s = refresh_interval_s,\n417\t \"peer discovery refresh loop started\"\n418\t );\n419\t loop {\n420\t interval.tick().await;\n421\t match peer_discovery.refresh().await {\n422\t Ok(peer_set) => {\n423\t let count = peer_set.len() as u64;\n424\t info!(\n425\t peer_count = count,\n426\t \"peer discovery refresh completed\"\n427\t );\n428\t metrics.set_peer_pod_count(count);\n429\t }\n430\t Err(e) => {\n431\t error!(error = %e, \"peer discovery refresh failed\");\n432\t }\n433\t }\n434\t }\n435\t });\n436\t } else {\n437\t info!(\"peer discovery disabled (not running in Kubernetes)\");\n438\t }\n439\t\n440\t // Start task registry TTL pruner background task (plan §4, Phase 3)\n441\t // Runs on single-pod with advisory lock; Phase 6 §14.5 Mode A replaces with rendezvous\n442\t if let Some(ref store) = state.admin.task_store {\n443\t let store = store.clone();\n444\t let pruner_config = config.task_registry.clone();\n445\t tokio::spawn(async move {\n446\t // The pruner runs in its own thread via spawn_pruner\n447\t let _pruner_handle = task_pruner::spawn_pruner(store, pruner_config);\n448\t // The handle is dropped here only on process exit\n449\t info!(\"task registry TTL pruner started\");\n450\t // Keep this task alive forever\n451\t std::future::pending::<()>().await;\n452\t });\n453\t } else {\n454\t info!(\"task registry TTL pruner not available (no task store)\");\n455\t }\n456\t\n457\t // Start canary runner background task (plan §13.18)\n458\t // Only enabled when canary_runner.enabled = true and Redis is available\n459\t if config.canary_runner.enabled {\n460\t if let Some(ref redis) = state.redis_store {\n461\t let store: Arc = Arc::from(redis.clone());\n462\t let canary_config = config.canary_runner.clone();\n463\t\n464\t // Clone config values for the search executor\n465\t let search_config = config.clone();\n466\t let search_executor: miroir_core::canary::SearchExecutor = Arc::new(\n467\t move |index_uid: &str, query: &SearchQuery| -> std::pin::Pin> + Send>> {\n468\t let index_uid = index_uid.to_string();\n469\t let query = query.clone();\n470\t let config = search_config.clone();\n471\t\n472\t Box::pin(async move {\n473\t // For canary queries, we execute against the first available healthy node\n474\t let node_addresses: Vec<_> = config.nodes.iter()\n475\t .map(|n| n.address.clone())\n476\t .collect();\n477\t\n478\t for address in node_addresses {\n479\t let client = match reqwest::Client::builder()\n480\t .timeout(std::time::Duration::from_millis(config.scatter.node_timeout_ms))\n481\t .build()\n482\t {\n483\t Ok(c) => c,\n484\t Err(_) => continue,\n485\t };\n486\t\n487\t let url = format!(\"{}/indexes/{}/search\", address.trim_end_matches('/'), index_uid);\n488\t\n489\t // Build the search request body\n490\t let mut body = match serde_json::to_value(&query) {\n491\t Ok(v) => v,\n492\t Err(e) => return Err(miroir_core::error::MiroirError::InvalidRequest(format!(\"Failed to serialize query: {}\", e))),\n493\t };\n494\t\n495\t // Add limit to avoid large responses for canary queries\n496\t if !body.get(\"limit\").and_then(|v| v.as_u64()).is_some() {\n497\t body[\"limit\"] = serde_json::json!(20);\n498\t }\n499\t\n500\t let response = match client.post(&url)\n501\t .header(\"Authorization\", format!(\"Bearer {}\", config.node_master_key))\n502\t .json(&body)\n503\t .send()\n504\t .await\n505\t {\n506\t Ok(r) => r,\n507\t Err(_) => continue,\n508\t };\n509\t\n510\t if response.status().is_success() {\n511\t if let Ok(text) = response.text().await {\n512\t if let Ok(search_response) = serde_json::from_str::(&text) {\n513\t return Ok(search_response);\n514\t }\n515\t }\n516\t }\n517\t }\n518\t\n519\t // All nodes failed\n520\t Err(miroir_core::error::MiroirError::Topology(\n521\t \"All nodes failed for canary query\".to_string()\n522\t ))\n523\t })\n524\t }\n525\t );\n526\t\n527\t // Create metrics emitter callback\n528\t let metrics_for_canary = state.metrics.clone();\n529\t let metrics_emitter: miroir_core::canary::MetricsEmitter = Arc::new(\n530\t move |result| {\n531\t use miroir_core::canary::CanaryStatus;\n532\t let result_str = match result.status {\n533\t CanaryStatus::Passed => \"passed\",\n534\t CanaryStatus::Failed => \"failed\",\n535\t CanaryStatus::Error => \"error\",\n536\t };\n537\t metrics_for_canary.inc_canary_runs(&result.canary_id, result_str);\n538\t metrics_for_canary.observe_canary_latency_ms(&result.canary_id, result.latency_ms as f64);\n539\t\n540\t for failure in &result.failed_assertions {\n541\t metrics_for_canary.inc_canary_assertion_failures(&result.canary_id, &failure.assertion_type);\n542\t }\n543\t }\n544\t );\n545\t\n546\t // Create settings version checker callback\n547\t let store_for_version = store.clone();\n548\t let version_config = config.clone();\n549\t let settings_version_checker: miroir_core::canary::SettingsVersionChecker = Arc::new(\n550\t move |index_uid: &str| -> Option {\n551\t // Try to get the settings version from the task store\n552\t let node_ids: Vec = version_config.nodes.iter()\n553\t .map(|n| n.id.clone())\n554\t .collect();\n555\t\n556\t let mut min_version: Option = None;\n557\t for node_id in node_ids {\n558\t if let Ok(Some(row)) = store_for_version.get_node_settings_version(index_uid, &node_id) {\n559\t match min_version {\n560\t None => min_version = Some(row.version),\n561\t Some(current) if row.version < current => min_version = Some(row.version),\n562\t _ => {}\n563\t }\n564\t }\n565\t }\n566\t min_version\n567\t }\n568\t );\n569\t\n570\t // Create and start the canary runner\n571\t let runner = CanaryRunner::new(\n572\t store,\n573\t canary_config.max_concurrent_canaries as usize,\n574\t canary_config.run_history_per_canary as usize,\n575\t search_executor,\n576\t metrics_emitter,\n577\t settings_version_checker,\n578\t );\n579\t\n580\t tokio::spawn(async move {\n581\t info!(\"canary runner started\");\n582\t if let Err(e) = runner.start().await {\n583\t error!(\"canary runner exited: {}\", e);\n584\t }\n585\t });\n586\t } else {\n587\t info!(\"canary runner enabled but Redis not available - skipping\");\n588\t }\n589\t }\n590\t\n591\t // Build the main app router with UnifiedState\n592\t let app = Router::new()\n593\t .route(\"/health\", get(health::get_health))\n594\t .route(\"/version\", get(version::get_version::))\n595\t .route(\"/stats\", get(indexes::global_stats_handler))\n596\t .route(\"/multi-search\", post(multi_search::multi_search::)) // §13.11\n597\t .nest(\"/_miroir\", admin::router::())\n598\t .nest(\"/indexes\", indexes::router::())\n599\t .nest(\"/keys\", keys::router::())\n600\t .nest(\"/search\", search::router::())\n601\t .nest(\"/settings\", settings::router::())\n602\t .nest(\"/tasks\", tasks::router::())\n603\t // IMPORTANT: Layer order matters! Last layer() call = outermost = runs first.\n604\t // The middleware stack (from outermost to innermost):\n605\t // 1. csrf_middleware - runs first\n606\t // 2. auth_middleware\n607\t // 3. Extension layers\n608\t // 4. session_pinning_middleware - extracts X-Miroir-Session header\n609\t // 5. request_id_middleware - sets X-Request-Id header\n610\t // 6. telemetry_middleware - reads X-Request-Id, creates tracing span with request_id field\n611\t // The span's request_id field propagates to all child log events via with_current_span(true)\n612\t //\n613\t // To achieve this order, we add layers in REVERSE (last call = outermost):\n614\t .layer(axum::middleware::from_fn_with_state(\n615\t TelemetryState {\n616\t metrics: state.metrics.clone(),\n617\t pod_id: state.pod_id.clone(),\n618\t },\n619\t middleware::telemetry_middleware,\n620\t ))\n621\t .layer(axum::middleware::from_fn(\n622\t middleware::request_id_middleware,\n623\t ))\n624\t .layer(axum::middleware::from_fn(\n625\t middleware::session_pinning_middleware,\n626\t ))\n627\t .layer(axum::extract::DefaultBodyLimit::max(\n628\t config.server.max_body_bytes as usize,\n629\t ))\n630\t .layer(axum::Extension(state.admin.config.clone()))\n631\t .layer(axum::Extension(std::sync::Arc::new(state.admin.clone())))\n632\t .layer(axum::middleware::from_fn_with_state(\n633\t state.auth.clone(),\n634\t auth::auth_middleware,\n635\t ))\n636\t .layer(axum::middleware::from_fn_with_state(\n637\t auth::CsrfState {\n638\t auth: state.auth.clone(),\n639\t redis_store: state.redis_store.clone(),\n640\t },\n641\t auth::csrf_middleware,\n642\t ))\n643\t .with_state(state.clone());\n644\t\n645\t let main_addr: SocketAddr = format!(\"{}:{}\", config.server.bind, config.server.port)\n646\t .parse()\n647\t .map_err(|e| anyhow::anyhow!(\"Invalid bind address: {}\", e))?;\n648\t let metrics_addr: SocketAddr = SocketAddr::from(([0, 0, 0, 0], 9090));\n649\t\n650\t info!(\n651\t main_addr = %main_addr,\n652\t metrics_addr = %metrics_addr,\n653\t \"listening\"\n654\t );\n655\t\n656\t // Create listeners\n657\t let main_listener = tokio::net::TcpListener::bind(main_addr).await?;\n658\t let metrics_listener = tokio::net::TcpListener::bind(metrics_addr).await?;\n659\t\n660\t // Spawn main server with graceful shutdown\n661\t let main_server = axum::serve(main_listener, app)\n662\t .with_graceful_shutdown(shutdown_signal());\n663\t\n664\t // Spawn metrics server with graceful shutdown\n665\t let metrics_app = metrics_router().with_state(state.metrics.clone());\n666\t let metrics_server = axum::serve(metrics_listener, metrics_app)\n667\t .with_graceful_shutdown(shutdown_signal());\n668\t\n669\t // Run both servers concurrently\n670\t let (main_result, metrics_result) = tokio::join!(\n671\t main_server,\n672\t metrics_server\n673\t );\n674\t\n675\t // Check for errors\n676\t if let Err(e) = main_result {\n677\t error!(\"main server error: {}\", e);\n678\t }\n679\t if let Err(e) = metrics_result {\n680\t error!(\"metrics server error: {}\", e);\n681\t }\n682\t\n683\t Ok(())\n684\t}\n685\t\n686\t/// Background health checker - promotes nodes to Active when reachable.\n687\t///\n688\t/// On each tick it also updates the Prometheus metrics for node health,\n689\t/// shard coverage, shard distribution, and degraded shard count.\n690\tasync fn run_health_checker(state: admin_endpoints::AppState) {\n691\t let mut interval = tokio::time::interval(Duration::from_millis(\n692\t state.config.health.interval_ms,\n693\t ));\n694\t\n695\t loop {\n696\t interval.tick().await;\n697\t\n698\t let mut topo = state.topology.write().await;\n699\t let mut all_healthy = true;\n700\t\n701\t // Collect node IDs to iterate\n702\t let node_ids: Vec<_> = topo.nodes().map(|n| n.id.clone()).collect();\n703\t\n704\t for node_id in &node_ids {\n705\t // Get current node status\n706\t let current_status = topo.node(node_id).map(|n| n.status);\n707\t\n708\t // Skip nodes that are already Active/Healthy\n709\t if let Some(NodeStatus::Active) | Some(NodeStatus::Healthy) = current_status {\n710\t continue;\n711\t }\n712\t\n713\t // Get node address\n714\t let node_address = match topo.node(node_id) {\n715\t Some(n) => n.address.clone(),\n716\t None => {\n717\t all_healthy = false;\n718\t continue;\n719\t }\n720\t };\n721\t\n722\t // Try to reach the node\n723\t let client = match reqwest::Client::builder()\n724\t .timeout(Duration::from_millis(state.config.health.timeout_ms))\n725\t .build()\n726\t {\n727\t Ok(c) => c,\n728\t Err(_) => {\n729\t all_healthy = false;\n730\t continue;\n731\t }\n732\t };\n733\t\n734\t let url = format!(\"{}/health\", node_address.trim_end_matches('/'));\n735\t let result = client.get(&url).send().await;\n736\t\n737\t if result.is_ok() && result.unwrap().status().is_success() {\n738\t // Node is reachable - promote to Active\n739\t if let Some(node) = topo.node_mut(node_id) {\n740\t let _ = node.transition_to(NodeStatus::Active);\n741\t info!(node_id = %node_id, \"node promoted to Active\");\n742\t }\n743\t } else {\n744\t all_healthy = false;\n745\t }\n746\t }\n747\t\n748\t // Update node health gauges (§10 node metrics)\n749\t for node_id in &node_ids {\n750\t let healthy = topo.node(node_id).map(|n| n.is_healthy()).unwrap_or(false);\n751\t state.metrics.set_node_healthy(node_id.as_str(), healthy);\n752\t }\n753\t\n754\t // Compute and update shard metrics (§10 shard metrics)\n755\t update_shard_metrics(&topo, &state.metrics);\n756\t\n757\t // Update task registry size gauge\n758\t let task_count = state.task_registry.count();\n759\t state.metrics.set_task_registry_size(task_count as f64);\n760\t\n761\t // Sync rebalancer metrics to Prometheus\n762\t state.sync_rebalancer_metrics_to_prometheus().await;\n763\t\n764\t // Mark ready once all configured nodes are reachable\n765\t if all_healthy && !state.config.nodes.is_empty() {\n766\t state.mark_ready().await;\n767\t }\n768\t\n769\t // Update §14.9 resource-pressure metrics\n770\t update_resource_pressure_metrics(&state.metrics);\n771\t\n772\t // Update §13.6 session pinning metrics\n773\t state.session_manager.update_metrics(|count| {\n774\t state.metrics.set_session_active_count(count as u64);\n775\t });\n776\t\n777\t // Prune expired sessions (plan §13.6)\n778\t let pruned = state.session_manager.prune_expired().await;\n779\t if pruned > 0 {\n780\t info!(\n781\t pruned_count = pruned,\n782\t \"pruned expired sessions\"\n783\t );\n784\t }\n785\t }\n786\t}\n787\t\n788\t/// Compute shard coverage, degraded count, and per-node shard distribution\n789\t/// from the current topology and update the corresponding Prometheus gauges.\n790\tfn update_shard_metrics(topo: &Topology, metrics: &middleware::Metrics) {\n791\t let node_map = topo.node_map();\n792\t let mut healthy_shards = 0u64;\n793\t let mut degraded_shards = 0u64;\n794\t\n795\t // Per-node shard count\n796\t let mut node_shard_counts: std::collections::HashMap =\n797\t std::collections::HashMap::new();\n798\t\n799\t for shard_id in 0..topo.shards {\n800\t let mut has_healthy_replica = false;\n801\t for group in topo.groups() {\n802\t let assigned = miroir_core::router::assign_shard_in_group(\n803\t shard_id, group.nodes(), topo.rf(),\n804\t );\n805\t for node_id in &assigned {\n806\t let healthy = node_map\n807\t .get(node_id)\n808\t .map(|n| n.is_healthy())\n809\t .unwrap_or(false);\n810\t if healthy {\n811\t has_healthy_replica = true;\n812\t *node_shard_counts.entry(node_id.clone()).or_insert(0) += 1;\n813\t }\n814\t }\n815\t }\n816\t if has_healthy_replica {\n817\t healthy_shards += 1;\n818\t } else {\n819\t degraded_shards += 1;\n820\t }\n821\t }\n822\t\n823\t let coverage = if topo.shards > 0 {\n824\t healthy_shards as f64 / topo.shards as f64\n825\t } else {\n826\t 1.0\n827\t };\n828\t metrics.set_shard_coverage(coverage);\n829\t metrics.set_degraded_shards(degraded_shards as f64);\n830\t\n831\t for (node_id, count) in &node_shard_counts {\n832\t metrics.set_shard_distribution(node_id.as_str(), *count as f64);\n833\t }\n834\t}\n835\t\n836\t/// Read cgroup v2 memory pressure and update §14.9 resource-pressure gauges.\n837\t///\n838\t/// In Kubernetes each container has its own cgroup; the paths below are the\n839\t/// standard cgroup v2 mount points. If the files don't exist (e.g. local dev\n840\t/// on macOS) the metrics remain at their zero defaults.\n841\tfn update_resource_pressure_metrics(metrics: &middleware::Metrics) {\n842\t // ── Memory pressure ──\n843\t // cgroup v2: /sys/fs/cgroup/memory.current and memory.max\n844\t let mem_current = read_cgroup_metric(\"/sys/fs/cgroup/memory.current\");\n845\t let mem_max = read_cgroup_metric(\"/sys/fs/cgroup/memory.max\");\n846\t\n847\t if let (Some(current), Some(max)) = (mem_current, mem_max) {\n848\t if max > 0 {\n849\t let ratio = current as f64 / max as f64;\n850\t let level = if ratio > 0.90 { 2 } else if ratio > 0.75 { 1 } else { 0 };\n851\t metrics.set_memory_pressure(level);\n852\t }\n853\t }\n854\t\n855\t // ── CPU throttling ──\n856\t // cgroup v2: /sys/fs/cgroup/cpu.stat contains throttle_usec\n857\t if let Ok(contents) = std::fs::read_to_string(\"/sys/fs/cgroup/cpu.stat\") {\n858\t for line in contents.lines() {\n859\t if let Some(rest) = line.strip_prefix(\"throttled_usec \") {\n860\t if let Ok(usec) = rest.trim().parse::() {\n861\t // Report delta — the counter is cumulative, so we report\n862\t // the raw value and let Prometheus handle rate().\n863\t // For simplicity we set the counter to the absolute value\n864\t // (Prometheus counters are monotonic; since this is called\n865\t // periodically, we just inc by the new delta).\n866\t // Actually, the metric is a Counter, so we can only inc it.\n867\t // We'll read the previous throttled value from a thread-local.\n868\t // Simpler approach: just report the current throttle time\n869\t // as a one-shot increment if non-zero.\n870\t metrics.inc_cpu_throttled_seconds(usec / 1_000_000.0);\n871\t }\n872\t }\n873\t }\n874\t }\n875\t\n876\t // ── Peer pod count and leader status ──\n877\t // Peer pod count is now set by peer discovery refresh loop (plan §14.5).\n878\t // Leader election is not yet implemented (plan §14.5 Mode B).\n879\t // Owned shards count will be set by Mode A rendezvous (plan §14.5).\n880\t metrics.set_leader(true);\n881\t metrics.set_owned_shards_count(0);\n882\t}\n883\t\n884\t/// Read a single integer value from a cgroup pseudo-file.\n885\tfn read_cgroup_metric(path: &str) -> Option {\n886\t std::fs::read_to_string(path)\n887\t .ok()\n888\t .and_then(|s| s.trim().parse::().ok())\n889\t}\n890\t\n891\t/// Graceful shutdown signal handler.\n892\tasync fn shutdown_signal() {\n893\t let ctrl_c = async {\n894\t signal::ctrl_c()\n895\t .await\n896\t .expect(\"failed to install Ctrl+C handler\");\n897\t };\n898\t\n899\t #[cfg(unix)]\n900\t let terminate = async {\n901\t signal::unix::signal(signal::unix::SignalKind::terminate())\n902\t .expect(\"failed to install signal handler\")\n903\t .recv()\n904\t .await;\n905\t };\n906\t\n907\t #[cfg(not(unix))]\n908\t let terminate = std::future::pending::<()>;\n909\t\n910\t tokio::select! {\n911\t _ = ctrl_c => {},\n912\t _ = terminate => {},\n913\t }\n914\t\n915\t info!(\"shutdown signal received, draining in-flight requests...\");\n916\t\n917\t // Shutdown OpenTelemetry to flush any pending traces\n918\t otel::shutdown_otel();\n919\t}\n920\t"}]},"parent_tool_use_id":null,"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","uuid":"bb8ad1a8-9f92-446d-be18-0f42b48918cb","timestamp":"2026-05-23T06:49:21.453Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/crates/miroir-proxy/src/main.rs","content":"use axum::{\n extract::FromRef,\n routing::{get, post},\n Router,\n};\nuse miroir_core::{\n config::MiroirConfig,\n peer_discovery::PeerDiscovery,\n rebalancer_worker::{RebalancerWorker, RebalancerWorkerConfig, TopologyChangeEvent},\n task_pruner,\n topology::{NodeStatus, Topology},\n};\nuse std::net::SocketAddr;\nuse std::time::Duration;\nuse tokio::signal;\nuse tracing::{error, info};\nuse tracing_subscriber::{EnvFilter, layer::SubscriberExt, registry, util::SubscriberInitExt};\n\nmod admin_session;\nmod auth;\nmod client;\nmod middleware;\nmod otel;\nmod routes;\nmod scoped_key_rotation;\n\nuse admin_session::SealKey;\nuse auth::AuthState;\nuse miroir_core::{\n canary::{CanaryAssertion, CanaryRunner, CapturedQuery, QueryCapture, SearchQuery, SearchResponse},\n task_store::TaskStore,\n};\nuse middleware::{Metrics, metrics_router, TelemetryState};\nuse routes::{\n admin, admin_endpoints, explain, health, indexes, keys, multi_search, search, settings, tasks, version,\n};\nuse scoped_key_rotation::ScopedKeyRotationState;\nuse std::sync::Arc;\n\n/// Unified application state containing all shared state.\n#[derive(Clone)]\nstruct UnifiedState {\n auth: AuthState,\n metrics: Metrics,\n admin: admin_endpoints::AppState,\n pod_id: String,\n redis_store: Option,\n query_capture: Arc,\n peer_discovery: Option>,\n}\n\nimpl UnifiedState {\n fn new(config: MiroirConfig) -> Self {\n let metrics = Metrics::new(&config);\n\n let master_key = std::env::var(\"MIROIR_MASTER_KEY\")\n .unwrap_or_else(|_| config.master_key.clone());\n\n let admin_key = std::env::var(\"MIROIR_ADMIN_API_KEY\")\n .unwrap_or_else(|_| config.admin.api_key.clone());\n\n let jwt_primary = if config.search_ui.enabled {\n std::env::var(&config.search_ui.auth.jwt_secret_env).ok()\n } else {\n None\n };\n\n let jwt_previous = std::env::var(&config.search_ui.auth.jwt_secret_previous_env)\n .ok()\n .filter(|v| !v.is_empty());\n\n let seal_key = SealKey::from_env_or_generate();\n\n // Set the key-generated gauge before constructing AuthState\n // so the metric is accurate from the first scrape.\n metrics.admin_session_key_generated().set(if seal_key.is_generated() { 1.0 } else { 0.0 });\n\n let pod_id = std::env::var(\"POD_NAME\").unwrap_or_else(|_| \"unknown\".to_string());\n let namespace = std::env::var(\"POD_NAMESPACE\").unwrap_or_else(|_| \"default\".to_string());\n\n // Create peer discovery instance (plan §14.5)\n // Only enabled when running in Kubernetes (POD_NAME is set to a real pod name)\n let peer_discovery = if pod_id != \"unknown\" {\n Some(Arc::new(PeerDiscovery::new(\n pod_id.clone(),\n namespace,\n config.peer_discovery.service_name.clone(),\n )))\n } else {\n None\n };\n\n // Create Redis task store if backend is redis (must happen before AppState\n // so redis_store and pod_id are available to admin endpoints).\n let redis_store = if config.task_store.backend == \"redis\" && !config.task_store.url.is_empty() {\n let url = config.task_store.url.clone();\n Some(\n tokio::task::block_in_place(|| {\n tokio::runtime::Handle::current().block_on(\n miroir_core::task_store::RedisTaskStore::open(&url)\n )\n })\n .expect(\"Failed to connect to Redis for scoped key rotation\"),\n )\n } else {\n None\n };\n\n let auth = AuthState {\n master_key,\n admin_key: admin_key.clone(),\n jwt_primary,\n jwt_previous,\n seal_key: seal_key.clone(),\n revoked_sessions: std::sync::Arc::new(dashmap::DashMap::new()),\n admin_session_revoked_total: metrics.admin_session_revoked_total(),\n };\n\n let admin = admin_endpoints::AppState::with_redis(\n config.clone(),\n metrics.clone(),\n redis_store.clone(),\n pod_id.clone(),\n seal_key.clone(),\n );\n\n Self {\n auth,\n metrics,\n admin,\n pod_id,\n redis_store,\n query_capture: Arc::new(QueryCapture::new(1000)),\n peer_discovery,\n }\n }\n}\n\n// Implement FromRef so that admin_endpoints::AppState can be extracted from UnifiedState\nimpl FromRef for admin_endpoints::AppState {\n fn from_ref(state: &UnifiedState) -> Self {\n Self {\n config: state.admin.config.clone(),\n topology: state.admin.topology.clone(),\n ready: state.admin.ready.clone(),\n metrics: state.admin.metrics.clone(),\n version_state: state.admin.version_state.clone(),\n task_registry: state.admin.task_registry.clone(),\n redis_store: state.redis_store.clone(),\n task_store: state.admin.task_store.clone(),\n pod_id: state.pod_id.clone(),\n seal_key: state.auth.seal_key.clone(),\n local_rate_limiter: admin_endpoints::LocalAdminRateLimiter::new(),\n local_search_ui_rate_limiter: admin_endpoints::LocalSearchUiRateLimiter::new(),\n rebalancer: state.admin.rebalancer.clone(),\n migration_coordinator: state.admin.migration_coordinator.clone(),\n rebalancer_worker: state.admin.rebalancer_worker.clone(),\n rebalancer_metrics: state.admin.rebalancer_metrics.clone(),\n previous_docs_migrated: state.admin.previous_docs_migrated.clone(),\n settings_broadcast: state.admin.settings_broadcast.clone(),\n drift_reconciler: state.admin.drift_reconciler.clone(),\n session_manager: state.admin.session_manager.clone(),\n alias_registry: state.admin.alias_registry.clone(),\n }\n }\n}\n\n// Implement FromRef so that TelemetryState can be extracted from UnifiedState\nimpl FromRef for TelemetryState {\n fn from_ref(state: &UnifiedState) -> Self {\n TelemetryState {\n metrics: state.metrics.clone(),\n pod_id: state.pod_id.clone(),\n }\n }\n}\n\n// Implement FromRef so that CsrfState can be extracted from UnifiedState\nimpl FromRef for auth::CsrfState {\n fn from_ref(state: &UnifiedState) -> Self {\n auth::CsrfState {\n auth: state.auth.clone(),\n redis_store: state.redis_store.clone(),\n }\n }\n}\n\n// Implement FromRef so that routes::aliases::AliasState can be extracted from UnifiedState\nimpl FromRef for routes::aliases::AliasState {\n fn from_ref(state: &UnifiedState) -> Self {\n Self {\n config: state.admin.config.clone(),\n task_store: state.admin.task_store.clone(),\n metrics: state.metrics.clone(),\n }\n }\n}\n\n// Implement FromRef so that routes::explain::ExplainState can be extracted from UnifiedState\nimpl FromRef for routes::explain::ExplainState {\n fn from_ref(state: &UnifiedState) -> Self {\n Self {\n config: state.admin.config.clone(),\n topology: state.admin.topology.clone(),\n }\n }\n}\n\n// Implement FromRef so that routes::multi_search::MultiSearchState can be extracted from UnifiedState\nimpl FromRef for routes::multi_search::MultiSearchState {\n fn from_ref(state: &UnifiedState) -> Self {\n Self {\n config: state.admin.config.clone(),\n topology: state.admin.topology.clone(),\n node_master_key: state.admin.config.master_key.clone(),\n metrics: state.metrics.clone(),\n alias_registry: state.admin.alias_registry.clone(),\n }\n }\n}\n\n// Implement FromRef so that routes::canary::CanaryState can be extracted from UnifiedState\nimpl FromRef for routes::canary::CanaryState {\n fn from_ref(state: &UnifiedState) -> Self {\n // Canary routes require Redis task store\n let redis_store = state.redis_store.clone()\n .expect(\"Canary routes require Redis task store (task_store.backend: redis)\");\n let store: Arc = Arc::from(redis_store);\n Self {\n store,\n capture: state.query_capture.clone(),\n }\n }\n}\n\n#[tokio::main]\nasync fn main() -> anyhow::Result<()> {\n // Load configuration (file → env → CLI overlay)\n let config = MiroirConfig::load()\n .map_err(|e| anyhow::anyhow!(\"Failed to load config: {}\", e))?;\n\n // Initialize structured JSON logging (plan §10 format)\n // Fields on every line: timestamp, level, target, message, pod_id\n // Per-request fields (request_id) are added by telemetry middleware span.\n let filter = EnvFilter::try_from_default_env()\n .unwrap_or_else(|_| EnvFilter::new(\"info\"));\n\n let pod_id = std::env::var(\"POD_NAME\").unwrap_or_else(|_| \"unknown\".to_string());\n\n // Build subscriber - conditionally add OTel layer\n // Note: We rebuild the layers in each branch because the types differ\n // OTel layer must be applied to the bare registry first\n if let Some(otel_layer) = otel::init_otel_layer(&config) {\n let json_layer = tracing_subscriber::fmt::layer()\n .json()\n .flatten_event(true)\n .with_target(true)\n .with_current_span(true)\n .with_span_list(false);\n // Apply OTel layer to registry first, then add filter and json layer\n registry()\n .with(otel_layer)\n .with(filter)\n .with(json_layer)\n .init();\n } else {\n let json_layer = tracing_subscriber::fmt::layer()\n .json()\n .flatten_event(true)\n .with_target(true)\n .with_current_span(true)\n .with_span_list(false);\n registry()\n .with(filter)\n .with(json_layer)\n .init();\n }\n\n // Set pod_id as a global default field so it appears on every log line.\n // This is done via a separate info span that is entered once and never\n // left — its fields propagate to all child spans and events.\n let _pod_span = tracing::info_span!(\"runtime\", pod_id = %pod_id).entered();\n\n info!(\n shards = config.shards,\n replication_factor = config.replication_factor,\n replica_groups = config.replica_groups,\n \"miroir-proxy starting\"\n );\n\n // Validate critical secrets at startup (plan §9: \"orchestrator refuses to\n // start the search UI without it\").\n if config.search_ui.enabled {\n let jwt_env = &config.search_ui.auth.jwt_secret_env;\n match std::env::var(jwt_env) {\n Ok(v) if !v.is_empty() => {}\n _ => {\n anyhow::bail!(\n \"search_ui is enabled but {} is not set — refusing to start. \\\n Either set the env var or disable search_ui (search_ui.enabled: false)\",\n jwt_env\n );\n }\n }\n }\n\n // Build unified state\n let state = UnifiedState::new(config.clone());\n\n // Start health checker background task\n let health_checker_state = state.admin.clone();\n tokio::spawn(async move {\n run_health_checker(health_checker_state).await;\n });\n\n // Start rebalancer worker background task (plan §4)\n if let Some(ref worker) = state.admin.rebalancer_worker {\n let worker = worker.clone();\n let pod_id = state.pod_id.clone();\n tokio::spawn(async move {\n info!(\n pod_id = %pod_id,\n \"rebalancer worker task starting\"\n );\n // Load any persisted rebalance jobs from previous runs\n if let Err(e) = worker.load_persisted_jobs().await {\n error!(error = %e, \"failed to load persisted rebalance jobs\");\n }\n worker.run().await;\n error!(\"rebalancer worker task exited unexpectedly\");\n });\n } else {\n info!(\"rebalancer worker not available (no task store configured)\");\n }\n\n // Start scoped key rotation background task (requires Redis)\n if let Some(ref redis) = state.redis_store {\n let rotation_state = ScopedKeyRotationState {\n config: state.admin.config.clone(),\n redis: redis.clone(),\n pod_id: state.pod_id.clone(),\n };\n tokio::spawn(async move {\n scoped_key_rotation::run_scoped_key_rotator(rotation_state).await;\n });\n\n // Start admin session revocation Pub/Sub subscriber (plan §9).\n // When any pod revokes a session (logout), the session ID is published\n // to `miroir:admin_session:revoked`. Every pod subscribes and adds the\n // ID to its in-memory DashMap, ensuring revoked cookies are rejected\n // across all pods within milliseconds.\n let revoked_sessions = state.auth.revoked_sessions.clone();\n let revoked_total = state.auth.admin_session_revoked_total.clone();\n let redis_url = config.task_store.url.clone();\n let key_prefix = redis.key_prefix().to_string();\n tokio::spawn(async move {\n info!(\"starting admin session revocation subscriber\");\n if let Err(e) = miroir_core::task_store::RedisTaskStore::subscribe_session_revocations(\n &redis_url,\n &key_prefix,\n move |session_id: String| {\n revoked_sessions.insert(session_id, ());\n revoked_total.inc();\n },\n )\n .await\n {\n error!(error = %e, \"admin session revocation subscriber exited with error\");\n }\n });\n }\n\n // Load aliases from task store on startup (plan §13.7)\n // Aliases must be loaded before any request routing to ensure consistent resolution\n if let Some(ref task_store) = state.admin.task_store {\n let alias_registry = state.admin.alias_registry.clone();\n let store = task_store.clone();\n tokio::spawn(async move {\n info!(\"loading aliases from task store\");\n match alias_registry.sync_from_store(&*store).await {\n Ok(()) => {\n let count = alias_registry.list().await.len();\n info!(count, \"aliases loaded successfully\");\n }\n Err(e) => {\n error!(error = %e, \"failed to load aliases from task store\");\n }\n }\n });\n } else {\n info!(\"alias loading skipped (no task store configured)\");\n }\n\n // Start drift reconciler background task (plan §13.5)\n // Uses the drift_reconciler from AppState which is already configured\n if let Some(ref drift_reconciler) = state.admin.drift_reconciler {\n let drift_reconciler = drift_reconciler.clone();\n tokio::spawn(async move {\n info!(\"drift reconciler started\");\n drift_reconciler.run().await;\n error!(\"drift reconciler exited unexpectedly\");\n });\n } else {\n info!(\"drift reconciler not available (no task store configured)\");\n }\n\n // Start peer discovery refresh loop (plan §14.5)\n // Periodically performs SRV lookups to discover peer pods\n if let Some(ref peer_discovery) = state.peer_discovery {\n let peer_discovery = peer_discovery.clone();\n let metrics = state.metrics.clone();\n let refresh_interval_s = config.peer_discovery.refresh_interval_s;\n tokio::spawn(async move {\n let mut interval = tokio::time::interval(Duration::from_secs(refresh_interval_s));\n info!(\n interval_s = refresh_interval_s,\n \"peer discovery refresh loop started\"\n );\n loop {\n interval.tick().await;\n match peer_discovery.refresh().await {\n Ok(peer_set) => {\n let count = peer_set.len() as u64;\n info!(\n peer_count = count,\n \"peer discovery refresh completed\"\n );\n metrics.set_peer_pod_count(count);\n }\n Err(e) => {\n error!(error = %e, \"peer discovery refresh failed\");\n }\n }\n }\n });\n } else {\n info!(\"peer discovery disabled (not running in Kubernetes)\");\n }\n\n // Start task registry TTL pruner background task (plan §4, Phase 3)\n // Runs on single-pod with advisory lock; Phase 6 §14.5 Mode A replaces with rendezvous\n if let Some(ref store) = state.admin.task_store {\n let store = store.clone();\n let pruner_config = config.task_registry.clone();\n tokio::spawn(async move {\n // The pruner runs in its own thread via spawn_pruner\n let _pruner_handle = task_pruner::spawn_pruner(store, pruner_config);\n // The handle is dropped here only on process exit\n info!(\"task registry TTL pruner started\");\n // Keep this task alive forever\n std::future::pending::<()>().await;\n });\n } else {\n info!(\"task registry TTL pruner not available (no task store)\");\n }\n\n // Start canary runner background task (plan §13.18)\n // Only enabled when canary_runner.enabled = true and Redis is available\n if config.canary_runner.enabled {\n if let Some(ref redis) = state.redis_store {\n let store: Arc = Arc::from(redis.clone());\n let canary_config = config.canary_runner.clone();\n\n // Clone config values for the search executor\n let search_config = config.clone();\n let search_executor: miroir_core::canary::SearchExecutor = Arc::new(\n move |index_uid: &str, query: &SearchQuery| -> std::pin::Pin> + Send>> {\n let index_uid = index_uid.to_string();\n let query = query.clone();\n let config = search_config.clone();\n\n Box::pin(async move {\n // For canary queries, we execute against the first available healthy node\n let node_addresses: Vec<_> = config.nodes.iter()\n .map(|n| n.address.clone())\n .collect();\n\n for address in node_addresses {\n let client = match reqwest::Client::builder()\n .timeout(std::time::Duration::from_millis(config.scatter.node_timeout_ms))\n .build()\n {\n Ok(c) => c,\n Err(_) => continue,\n };\n\n let url = format!(\"{}/indexes/{}/search\", address.trim_end_matches('/'), index_uid);\n\n // Build the search request body\n let mut body = match serde_json::to_value(&query) {\n Ok(v) => v,\n Err(e) => return Err(miroir_core::error::MiroirError::InvalidRequest(format!(\"Failed to serialize query: {}\", e))),\n };\n\n // Add limit to avoid large responses for canary queries\n if !body.get(\"limit\").and_then(|v| v.as_u64()).is_some() {\n body[\"limit\"] = serde_json::json!(20);\n }\n\n let response = match client.post(&url)\n .header(\"Authorization\", format!(\"Bearer {}\", config.node_master_key))\n .json(&body)\n .send()\n .await\n {\n Ok(r) => r,\n Err(_) => continue,\n };\n\n if response.status().is_success() {\n if let Ok(text) = response.text().await {\n if let Ok(search_response) = serde_json::from_str::(&text) {\n return Ok(search_response);\n }\n }\n }\n }\n\n // All nodes failed\n Err(miroir_core::error::MiroirError::Topology(\n \"All nodes failed for canary query\".to_string()\n ))\n })\n }\n );\n\n // Create metrics emitter callback\n let metrics_for_canary = state.metrics.clone();\n let metrics_emitter: miroir_core::canary::MetricsEmitter = Arc::new(\n move |result| {\n use miroir_core::canary::CanaryStatus;\n let result_str = match result.status {\n CanaryStatus::Passed => \"passed\",\n CanaryStatus::Failed => \"failed\",\n CanaryStatus::Error => \"error\",\n };\n metrics_for_canary.inc_canary_runs(&result.canary_id, result_str);\n metrics_for_canary.observe_canary_latency_ms(&result.canary_id, result.latency_ms as f64);\n\n for failure in &result.failed_assertions {\n metrics_for_canary.inc_canary_assertion_failures(&result.canary_id, &failure.assertion_type);\n }\n }\n );\n\n // Create settings version checker callback\n let store_for_version = store.clone();\n let version_config = config.clone();\n let settings_version_checker: miroir_core::canary::SettingsVersionChecker = Arc::new(\n move |index_uid: &str| -> Option {\n // Try to get the settings version from the task store\n let node_ids: Vec = version_config.nodes.iter()\n .map(|n| n.id.clone())\n .collect();\n\n let mut min_version: Option = None;\n for node_id in node_ids {\n if let Ok(Some(row)) = store_for_version.get_node_settings_version(index_uid, &node_id) {\n match min_version {\n None => min_version = Some(row.version),\n Some(current) if row.version < current => min_version = Some(row.version),\n _ => {}\n }\n }\n }\n min_version\n }\n );\n\n // Create and start the canary runner\n let runner = CanaryRunner::new(\n store,\n canary_config.max_concurrent_canaries as usize,\n canary_config.run_history_per_canary as usize,\n search_executor,\n metrics_emitter,\n settings_version_checker,\n );\n\n tokio::spawn(async move {\n info!(\"canary runner started\");\n if let Err(e) = runner.start().await {\n error!(\"canary runner exited: {}\", e);\n }\n });\n } else {\n info!(\"canary runner enabled but Redis not available - skipping\");\n }\n }\n\n // Build the main app router with UnifiedState\n let app = Router::new()\n .route(\"/health\", get(health::get_health))\n .route(\"/version\", get(version::get_version::))\n .route(\"/stats\", get(indexes::global_stats_handler))\n .route(\"/multi-search\", post(multi_search::multi_search::)) // §13.11\n .nest(\"/_miroir\", admin::router::())\n .nest(\"/indexes\", indexes::router::())\n .nest(\"/keys\", keys::router::())\n .nest(\"/search\", search::router::())\n .nest(\"/settings\", settings::router::())\n .nest(\"/tasks\", tasks::router::())\n // IMPORTANT: Layer order matters! Last layer() call = outermost = runs first.\n // The middleware stack (from outermost to innermost):\n // 1. csrf_middleware - runs first\n // 2. auth_middleware\n // 3. Extension layers\n // 4. session_pinning_middleware - extracts X-Miroir-Session header\n // 5. request_id_middleware - sets X-Request-Id header\n // 6. telemetry_middleware - reads X-Request-Id, creates tracing span with request_id field\n // The span's request_id field propagates to all child log events via with_current_span(true)\n //\n // To achieve this order, we add layers in REVERSE (last call = outermost):\n .layer(axum::middleware::from_fn_with_state(\n TelemetryState {\n metrics: state.metrics.clone(),\n pod_id: state.pod_id.clone(),\n },\n middleware::telemetry_middleware,\n ))\n .layer(axum::middleware::from_fn(\n middleware::request_id_middleware,\n ))\n .layer(axum::middleware::from_fn(\n middleware::session_pinning_middleware,\n ))\n .layer(axum::extract::DefaultBodyLimit::max(\n config.server.max_body_bytes as usize,\n ))\n .layer(axum::Extension(state.admin.config.clone()))\n .layer(axum::Extension(std::sync::Arc::new(state.admin.clone())))\n .layer(axum::middleware::from_fn_with_state(\n state.auth.clone(),\n auth::auth_middleware,\n ))\n .layer(axum::middleware::from_fn_with_state(\n auth::CsrfState {\n auth: state.auth.clone(),\n redis_store: state.redis_store.clone(),\n },\n auth::csrf_middleware,\n ))\n .with_state(state.clone());\n\n let main_addr: SocketAddr = format!(\"{}:{}\", config.server.bind, config.server.port)\n .parse()\n .map_err(|e| anyhow::anyhow!(\"Invalid bind address: {}\", e))?;\n let metrics_addr: SocketAddr = SocketAddr::from(([0, 0, 0, 0], 9090));\n\n info!(\n main_addr = %main_addr,\n metrics_addr = %metrics_addr,\n \"listening\"\n );\n\n // Create listeners\n let main_listener = tokio::net::TcpListener::bind(main_addr).await?;\n let metrics_listener = tokio::net::TcpListener::bind(metrics_addr).await?;\n\n // Spawn main server with graceful shutdown\n let main_server = axum::serve(main_listener, app)\n .with_graceful_shutdown(shutdown_signal());\n\n // Spawn metrics server with graceful shutdown\n let metrics_app = metrics_router().with_state(state.metrics.clone());\n let metrics_server = axum::serve(metrics_listener, metrics_app)\n .with_graceful_shutdown(shutdown_signal());\n\n // Run both servers concurrently\n let (main_result, metrics_result) = tokio::join!(\n main_server,\n metrics_server\n );\n\n // Check for errors\n if let Err(e) = main_result {\n error!(\"main server error: {}\", e);\n }\n if let Err(e) = metrics_result {\n error!(\"metrics server error: {}\", e);\n }\n\n Ok(())\n}\n\n/// Background health checker - promotes nodes to Active when reachable.\n///\n/// On each tick it also updates the Prometheus metrics for node health,\n/// shard coverage, shard distribution, and degraded shard count.\nasync fn run_health_checker(state: admin_endpoints::AppState) {\n let mut interval = tokio::time::interval(Duration::from_millis(\n state.config.health.interval_ms,\n ));\n\n loop {\n interval.tick().await;\n\n let mut topo = state.topology.write().await;\n let mut all_healthy = true;\n\n // Collect node IDs to iterate\n let node_ids: Vec<_> = topo.nodes().map(|n| n.id.clone()).collect();\n\n for node_id in &node_ids {\n // Get current node status\n let current_status = topo.node(node_id).map(|n| n.status);\n\n // Skip nodes that are already Active/Healthy\n if let Some(NodeStatus::Active) | Some(NodeStatus::Healthy) = current_status {\n continue;\n }\n\n // Get node address\n let node_address = match topo.node(node_id) {\n Some(n) => n.address.clone(),\n None => {\n all_healthy = false;\n continue;\n }\n };\n\n // Try to reach the node\n let client = match reqwest::Client::builder()\n .timeout(Duration::from_millis(state.config.health.timeout_ms))\n .build()\n {\n Ok(c) => c,\n Err(_) => {\n all_healthy = false;\n continue;\n }\n };\n\n let url = format!(\"{}/health\", node_address.trim_end_matches('/'));\n let result = client.get(&url).send().await;\n\n if result.is_ok() && result.unwrap().status().is_success() {\n // Node is reachable - promote to Active\n if let Some(node) = topo.node_mut(node_id) {\n let _ = node.transition_to(NodeStatus::Active);\n info!(node_id = %node_id, \"node promoted to Active\");\n }\n } else {\n all_healthy = false;\n }\n }\n\n // Update node health gauges (§10 node metrics)\n for node_id in &node_ids {\n let healthy = topo.node(node_id).map(|n| n.is_healthy()).unwrap_or(false);\n state.metrics.set_node_healthy(node_id.as_str(), healthy);\n }\n\n // Compute and update shard metrics (§10 shard metrics)\n update_shard_metrics(&topo, &state.metrics);\n\n // Update task registry size gauge\n let task_count = state.task_registry.count();\n state.metrics.set_task_registry_size(task_count as f64);\n\n // Sync rebalancer metrics to Prometheus\n state.sync_rebalancer_metrics_to_prometheus().await;\n\n // Mark ready once all configured nodes are reachable\n if all_healthy && !state.config.nodes.is_empty() {\n state.mark_ready().await;\n }\n\n // Update §14.9 resource-pressure metrics\n update_resource_pressure_metrics(&state.metrics);\n\n // Update §13.6 session pinning metrics\n state.session_manager.update_metrics(|count| {\n state.metrics.set_session_active_count(count as u64);\n });\n\n // Prune expired sessions (plan §13.6)\n let pruned = state.session_manager.prune_expired().await;\n if pruned > 0 {\n info!(\n pruned_count = pruned,\n \"pruned expired sessions\"\n );\n }\n }\n}\n\n/// Compute shard coverage, degraded count, and per-node shard distribution\n/// from the current topology and update the corresponding Prometheus gauges.\nfn update_shard_metrics(topo: &Topology, metrics: &middleware::Metrics) {\n let node_map = topo.node_map();\n let mut healthy_shards = 0u64;\n let mut degraded_shards = 0u64;\n\n // Per-node shard count\n let mut node_shard_counts: std::collections::HashMap =\n std::collections::HashMap::new();\n\n for shard_id in 0..topo.shards {\n let mut has_healthy_replica = false;\n for group in topo.groups() {\n let assigned = miroir_core::router::assign_shard_in_group(\n shard_id, group.nodes(), topo.rf(),\n );\n for node_id in &assigned {\n let healthy = node_map\n .get(node_id)\n .map(|n| n.is_healthy())\n .unwrap_or(false);\n if healthy {\n has_healthy_replica = true;\n *node_shard_counts.entry(node_id.clone()).or_insert(0) += 1;\n }\n }\n }\n if has_healthy_replica {\n healthy_shards += 1;\n } else {\n degraded_shards += 1;\n }\n }\n\n let coverage = if topo.shards > 0 {\n healthy_shards as f64 / topo.shards as f64\n } else {\n 1.0\n };\n metrics.set_shard_coverage(coverage);\n metrics.set_degraded_shards(degraded_shards as f64);\n\n for (node_id, count) in &node_shard_counts {\n metrics.set_shard_distribution(node_id.as_str(), *count as f64);\n }\n}\n\n/// Read cgroup v2 memory pressure and update §14.9 resource-pressure gauges.\n///\n/// In Kubernetes each container has its own cgroup; the paths below are the\n/// standard cgroup v2 mount points. If the files don't exist (e.g. local dev\n/// on macOS) the metrics remain at their zero defaults.\nfn update_resource_pressure_metrics(metrics: &middleware::Metrics) {\n // ── Memory pressure ──\n // cgroup v2: /sys/fs/cgroup/memory.current and memory.max\n let mem_current = read_cgroup_metric(\"/sys/fs/cgroup/memory.current\");\n let mem_max = read_cgroup_metric(\"/sys/fs/cgroup/memory.max\");\n\n if let (Some(current), Some(max)) = (mem_current, mem_max) {\n if max > 0 {\n let ratio = current as f64 / max as f64;\n let level = if ratio > 0.90 { 2 } else if ratio > 0.75 { 1 } else { 0 };\n metrics.set_memory_pressure(level);\n }\n }\n\n // ── CPU throttling ──\n // cgroup v2: /sys/fs/cgroup/cpu.stat contains throttle_usec\n if let Ok(contents) = std::fs::read_to_string(\"/sys/fs/cgroup/cpu.stat\") {\n for line in contents.lines() {\n if let Some(rest) = line.strip_prefix(\"throttled_usec \") {\n if let Ok(usec) = rest.trim().parse::() {\n // Report delta — the counter is cumulative, 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Structured logging, request IDs, and Prometheus metrics middleware.\n2\t\n3\tuse std::time::Instant;\n4\t\n5\tuse axum::{\n6\t extract::{Request, State},\n7\t http::{HeaderMap, HeaderValue},\n8\t middleware::Next,\n9\t response::Response,\n10\t Router,\n11\t routing::get,\n12\t};\n13\tuse miroir_core::config::MiroirConfig;\n14\tuse prometheus::{\n15\t Counter, CounterVec, Encoder, Gauge, GaugeVec, Histogram, HistogramOpts, HistogramVec, Opts,\n16\t Registry, TextEncoder,\n17\t};\n18\tuse tracing::info_span;\n19\tuse uuid::Uuid;\n20\tuse hex;\n21\tuse std::collections::hash_map::DefaultHasher;\n22\tuse std::hash::{Hash, Hasher};\n23\t\n24\t/// Request ID wrapper type for storing in axum Request extensions.\n25\t///\n26\t/// This is a newtype wrapper around the 8-character hex request ID,\n27\t/// allowing handlers to extract it via `Request.extensions().get::()`.\n28\t#[derive(Clone, Debug, PartialEq, Eq, Hash)]\n29\tpub struct RequestId(pub String);\n30\t\n31\timpl RequestId {\n32\t /// Create a new RequestId from a UUIDv7.\n33\t ///\n34\t /// Hashes the full UUIDv7 to produce an 8-character hex ID that is unique\n35\t /// even for consecutive calls within the same millisecond.\n36\t pub fn new() -> Self {\n37\t let uuid = Uuid::now_v7();\n38\t let bytes = uuid.as_bytes();\n39\t // Hash the full UUID to ensure uniqueness even within the same millisecond\n40\t let mut hasher = DefaultHasher::new();\n41\t hasher.write(bytes);\n42\t let hash = hasher.finish();\n43\t // Take first 8 hex chars of 64-bit hash (32 bits is sufficient entropy)\n44\t Self(format!(\"{:08x}\", hash as u32))\n45\t }\n46\t\n47\t /// Get the inner request ID string.\n48\t pub fn as_str(&self) -> &str {\n49\t &self.0\n50\t }\n51\t\n52\t /// Parse a RequestId from a string.\n53\t pub fn parse(s: String) -> Option {\n54\t if s.len() == 8 && s.chars().all(|c| c.is_ascii_hexdigit()) {\n55\t Some(Self(s))\n56\t } else {\n57\t None\n58\t }\n59\t }\n60\t}\n61\t\n62\t/// Session ID wrapper type for read-your-writes session pinning (plan §13.6).\n63\t///\n64\t/// Extracted from the `X-Miroir-Session` header and stored in request extensions.\n65\t/// Handlers can access it via `Request.extensions().get::()`.\n66\t#[derive(Clone, Debug, PartialEq, Eq, Hash)]\n67\tpub struct SessionId(pub String);\n68\t\n69\timpl Default for SessionId {\n70\t fn default() -> Self {\n71\t Self(String::new())\n72\t }\n73\t}\n74\t\n75\timpl SessionId {\n76\t /// Get the inner session ID string.\n77\t pub fn as_str(&self) -> &str {\n78\t &self.0\n79\t }\n80\t\n81\t /// Parse a SessionId from a string.\n82\t ///\n83\t /// Accepts any non-empty string (client-provided UUID or identifier).\n84\t pub fn parse(s: String) -> Option {\n85\t if !s.is_empty() && s.len() <= 256 {\n86\t Some(Self(s))\n87\t } else {\n88\t None\n89\t }\n90\t }\n91\t}\n92\t\n93\tpub async fn request_id_middleware(\n94\t mut req: Request,\n95\t next: Next,\n96\t) -> Response {\n97\t // Check for existing request ID in headers\n98\t let request_id = req\n99\t .headers()\n100\t .get(\"x-request-id\")\n101\t .and_then(|v| v.to_str().ok())\n102\t .and_then(|s| RequestId::parse(s.to_string()))\n103\t .unwrap_or_else(RequestId::new);\n104\t\n105\t // Store in request extensions for handler access\n106\t req.extensions_mut().insert(request_id.clone());\n107\t\n108\t // Set X-Request-Id header on request (for telemetry_middleware to read)\n109\t if let Ok(val) = HeaderValue::from_str(request_id.as_str()) {\n110\t req.headers_mut().insert(\"x-request-id\", val);\n111\t }\n112\t\n113\t // Process the request\n114\t let mut response = next.run(req).await;\n115\t\n116\t // Add X-Request-Id header to response (override if exists)\n117\t if let Ok(val) = HeaderValue::from_str(request_id.as_str()) {\n118\t response.headers_mut().insert(\"x-request-id\", val);\n119\t }\n120\t\n121\t response\n122\t}\n123\t\n124\t/// Session pinning middleware (plan §13.6).\n125\t///\n126\t/// Extracts the `X-Miroir-Session` header and stores it in request extensions\n127\t/// for handlers to access via `Request.extensions().get::()`.\n128\tpub async fn session_pinning_middleware(\n129\t mut req: Request,\n130\t next: Next,\n131\t) -> Response {\n132\t // Extract session ID from header if present\n133\t let session_id = req\n134\t .headers()\n135\t .get(\"x-miroir-session\")\n136\t .and_then(|v| v.to_str().ok())\n137\t .and_then(|s| SessionId::parse(s.to_string()));\n138\t\n139\t // Store in request extensions for handler access\n140\t if let Some(sid) = session_id {\n141\t req.extensions_mut().insert(sid);\n142\t }\n143\t\n144\t next.run(req).await\n145\t}\n146\t\n147\t\n148\t/// Telemetry state combining metrics and pod_id for middleware.\n149\t#[derive(Clone)]\n150\tpub struct TelemetryState {\n151\t pub metrics: Metrics,\n152\t pub pod_id: String,\n153\t}\n154\t\n155\timpl TelemetryState {\n156\t pub fn new(metrics: Metrics) -> Self {\n157\t let pod_id = std::env::var(\"POD_NAME\").unwrap_or_else(|_| \"unknown\".to_string());\n158\t Self { metrics, pod_id }\n159\t }\n160\t}\n161\t\n162\t/// Global metrics registry shared across all middleware instances.\n163\tpub struct Metrics {\n164\t registry: Registry,\n165\t\n166\t // ── Request metrics ──\n167\t request_duration: HistogramVec,\n168\t requests_total: CounterVec,\n169\t requests_in_flight: Gauge,\n170\t\n171\t // ── Node health metrics ──\n172\t node_healthy: GaugeVec,\n173\t node_request_duration: HistogramVec,\n174\t node_errors: CounterVec,\n175\t\n176\t // ── Shard metrics ──\n177\t shard_coverage: Gauge,\n178\t degraded_shards: Gauge,\n179\t shard_distribution: GaugeVec,\n180\t\n181\t // ── Task metrics ──\n182\t task_processing_age: Histogram,\n183\t tasks_total: CounterVec,\n184\t task_registry_size: Gauge,\n185\t\n186\t // ── Scatter-gather metrics ──\n187\t scatter_fan_out_size: Histogram,\n188\t scatter_partial_responses: Counter,\n189\t scatter_retries: Counter,\n190\t\n191\t // ── Rebalancer metrics ──\n192\t rebalance_in_progress: Gauge,\n193\t rebalance_documents_migrated: Counter,\n194\t rebalance_duration: Histogram,\n195\t\n196\t // ── §13.11 Multi-search metrics (feature-gated) ──\n197\t multisearch_queries_per_batch: Option,\n198\t multisearch_batches_total: Option,\n199\t multisearch_partial_failures_total: Option,\n200\t multisearch_tenant_session_pin_override_total: Option,\n201\t\n202\t // ── §13.12 Vector search metrics (feature-gated) ──\n203\t vector_search_over_fetched_total: Option,\n204\t vector_merge_strategy: Option,\n205\t vector_embedder_drift_total: Option,\n206\t\n207\t // ── §13.13 CDC metrics (feature-gated) ──\n208\t cdc_events_published_total: Option,\n209\t cdc_lag_seconds: Option,\n210\t cdc_buffer_bytes: Option,\n211\t cdc_dropped_total: Option,\n212\t cdc_events_suppressed_total: Option,\n213\t\n214\t // ── §13.14 TTL metrics (feature-gated) ──\n215\t ttl_documents_expired_total: Option,\n216\t ttl_sweep_duration_seconds: Option,\n217\t ttl_pending_estimate: Option,\n218\t\n219\t // ── §13.15 Tenant affinity metrics (feature-gated) ──\n220\t tenant_queries_total: Option,\n221\t tenant_pinned_groups: Option,\n222\t tenant_fallback_total: Option,\n223\t\n224\t // ── §13.16 Shadow traffic metrics (feature-gated) ──\n225\t shadow_diff_total: Option,\n226\t shadow_kendall_tau: Option,\n227\t shadow_latency_delta_seconds: Option,\n228\t shadow_errors_total: Option,\n229\t\n230\t // ── §13.17 ILM metrics (feature-gated) ──\n231\t rollover_events_total: Option,\n232\t rollover_active_indexes: Option,\n233\t rollover_documents_expired_total: Option,\n234\t rollover_last_action_seconds: Option,\n235\t\n236\t // ── §13.18 Canary metrics (feature-gated) ──\n237\t canary_runs_total: Option,\n238\t canary_latency_ms: Option,\n239\t canary_assertion_failures_total: Option,\n240\t\n241\t // ── §13.19 Admin UI metrics (feature-gated) ──\n242\t admin_ui_sessions_total: Option,\n243\t admin_ui_action_total: Option,\n244\t admin_ui_destructive_action_total: Option,\n245\t\n246\t // ── §13.20 Explain metrics (feature-gated) ──\n247\t explain_requests_total: Option,\n248\t explain_warnings_total: Option,\n249\t explain_execute_total: Option,\n250\t\n251\t // ── §13.21 Search UI metrics (feature-gated) ──\n252\t search_ui_sessions_total: Option,\n253\t search_ui_queries_total: Option,\n254\t search_ui_zero_hits_total: Option,\n255\t search_ui_click_through_total: Option,\n256\t search_ui_p95_ms: Option,\n257\t\n258\t // ── §14.9 Resource-pressure metrics (always present) ──\n259\t memory_pressure: Gauge,\n260\t cpu_throttled_seconds_total: Counter,\n261\t request_queue_depth: Gauge,\n262\t background_queue_depth: GaugeVec,\n263\t peer_pod_count: Gauge,\n264\t leader: Gauge,\n265\t owned_shards_count: Gauge,\n266\t\n267\t // ── Admin session sealing metrics (always present) ──\n268\t admin_session_key_generated: Gauge,\n269\t admin_session_revoked_total: Counter,\n270\t\n271\t // ── §13.5 Two-phase settings broadcast metrics (always present) ──\n272\t settings_broadcast_phase: GaugeVec,\n273\t settings_hash_mismatch_total: Counter,\n274\t settings_drift_repair_total: CounterVec,\n275\t settings_version: GaugeVec,\n276\t\n277\t // ── §13.7 Alias metrics (always present) ──\n278\t alias_resolutions_total: CounterVec,\n279\t alias_flips_total: CounterVec,\n280\t\n281\t // ── §13.6 Session pinning metrics (always present) ──\n282\t session_active_count: Gauge,\n283\t session_pin_enforced_total: CounterVec,\n284\t session_wait_duration_seconds: Histogram,\n285\t session_wait_timeout_total: CounterVec,\n286\t}\n287\t\n288\timpl Clone for Metrics {\n289\t fn clone(&self) -> Self {\n290\t Self {\n291\t registry: self.registry.clone(),\n292\t request_duration: self.request_duration.clone(),\n293\t requests_total: self.requests_total.clone(),\n294\t requests_in_flight: self.requests_in_flight.clone(),\n295\t node_healthy: self.node_healthy.clone(),\n296\t node_request_duration: self.node_request_duration.clone(),\n297\t node_errors: self.node_errors.clone(),\n298\t shard_coverage: self.shard_coverage.clone(),\n299\t degraded_shards: self.degraded_shards.clone(),\n300\t shard_distribution: self.shard_distribution.clone(),\n301\t task_processing_age: self.task_processing_age.clone(),\n302\t tasks_total: self.tasks_total.clone(),\n303\t task_registry_size: self.task_registry_size.clone(),\n304\t scatter_fan_out_size: self.scatter_fan_out_size.clone(),\n305\t scatter_partial_responses: self.scatter_partial_responses.clone(),\n306\t scatter_retries: self.scatter_retries.clone(),\n307\t rebalance_in_progress: self.rebalance_in_progress.clone(),\n308\t rebalance_documents_migrated: self.rebalance_documents_migrated.clone(),\n309\t rebalance_duration: self.rebalance_duration.clone(),\n310\t multisearch_queries_per_batch: self.multisearch_queries_per_batch.clone(),\n311\t multisearch_batches_total: self.multisearch_batches_total.clone(),\n312\t multisearch_partial_failures_total: self.multisearch_partial_failures_total.clone(),\n313\t multisearch_tenant_session_pin_override_total: self.multisearch_tenant_session_pin_override_total.clone(),\n314\t vector_search_over_fetched_total: self.vector_search_over_fetched_total.clone(),\n315\t vector_merge_strategy: self.vector_merge_strategy.clone(),\n316\t vector_embedder_drift_total: self.vector_embedder_drift_total.clone(),\n317\t cdc_events_published_total: self.cdc_events_published_total.clone(),\n318\t cdc_lag_seconds: self.cdc_lag_seconds.clone(),\n319\t cdc_buffer_bytes: self.cdc_buffer_bytes.clone(),\n320\t cdc_dropped_total: self.cdc_dropped_total.clone(),\n321\t cdc_events_suppressed_total: self.cdc_events_suppressed_total.clone(),\n322\t ttl_documents_expired_total: self.ttl_documents_expired_total.clone(),\n323\t ttl_sweep_duration_seconds: self.ttl_sweep_duration_seconds.clone(),\n324\t ttl_pending_estimate: self.ttl_pending_estimate.clone(),\n325\t tenant_queries_total: self.tenant_queries_total.clone(),\n326\t tenant_pinned_groups: self.tenant_pinned_groups.clone(),\n327\t tenant_fallback_total: self.tenant_fallback_total.clone(),\n328\t shadow_diff_total: self.shadow_diff_total.clone(),\n329\t shadow_kendall_tau: self.shadow_kendall_tau.clone(),\n330\t shadow_latency_delta_seconds: self.shadow_latency_delta_seconds.clone(),\n331\t shadow_errors_total: self.shadow_errors_total.clone(),\n332\t rollover_events_total: self.rollover_events_total.clone(),\n333\t rollover_active_indexes: self.rollover_active_indexes.clone(),\n334\t rollover_documents_expired_total: self.rollover_documents_expired_total.clone(),\n335\t rollover_last_action_seconds: self.rollover_last_action_seconds.clone(),\n336\t canary_runs_total: self.canary_runs_total.clone(),\n337\t canary_latency_ms: self.canary_latency_ms.clone(),\n338\t canary_assertion_failures_total: self.canary_assertion_failures_total.clone(),\n339\t admin_ui_sessions_total: self.admin_ui_sessions_total.clone(),\n340\t admin_ui_action_total: self.admin_ui_action_total.clone(),\n341\t admin_ui_destructive_action_total: self.admin_ui_destructive_action_total.clone(),\n342\t explain_requests_total: self.explain_requests_total.clone(),\n343\t explain_warnings_total: self.explain_warnings_total.clone(),\n344\t explain_execute_total: self.explain_execute_total.clone(),\n345\t search_ui_sessions_total: self.search_ui_sessions_total.clone(),\n346\t search_ui_queries_total: self.search_ui_queries_total.clone(),\n347\t search_ui_zero_hits_total: self.search_ui_zero_hits_total.clone(),\n348\t search_ui_click_through_total: self.search_ui_click_through_total.clone(),\n349\t search_ui_p95_ms: self.search_ui_p95_ms.clone(),\n350\t memory_pressure: self.memory_pressure.clone(),\n351\t cpu_throttled_seconds_total: self.cpu_throttled_seconds_total.clone(),\n352\t request_queue_depth: self.request_queue_depth.clone(),\n353\t background_queue_depth: self.background_queue_depth.clone(),\n354\t peer_pod_count: self.peer_pod_count.clone(),\n355\t leader: self.leader.clone(),\n356\t owned_shards_count: self.owned_shards_count.clone(),\n357\t admin_session_key_generated: self.admin_session_key_generated.clone(),\n358\t admin_session_revoked_total: self.admin_session_revoked_total.clone(),\n359\t settings_broadcast_phase: self.settings_broadcast_phase.clone(),\n360\t settings_hash_mismatch_total: self.settings_hash_mismatch_total.clone(),\n361\t settings_drift_repair_total: self.settings_drift_repair_total.clone(),\n362\t settings_version: self.settings_version.clone(),\n363\t alias_resolutions_total: self.alias_resolutions_total.clone(),\n364\t alias_flips_total: self.alias_flips_total.clone(),\n365\t session_active_count: self.session_active_count.clone(),\n366\t session_pin_enforced_total: self.session_pin_enforced_total.clone(),\n367\t session_wait_duration_seconds: self.session_wait_duration_seconds.clone(),\n368\t session_wait_timeout_total: self.session_wait_timeout_total.clone(),\n369\t }\n370\t }\n371\t}\n372\t\n373\timpl Default for Metrics {\n374\t fn default() -> Self {\n375\t Self::new(&MiroirConfig::default())\n376\t }\n377\t}\n378\t\n379\timpl Metrics {\n380\t pub fn new(config: &MiroirConfig) -> Self {\n381\t let registry = Registry::new();\n382\t\n383\t // ── Request metrics ──\n384\t let request_duration = HistogramVec::new(\n385\t HistogramOpts::new(\"miroir_request_duration_seconds\", \"Request latency in seconds\")\n386\t .buckets(vec![0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0, 10.0]),\n387\t &[\"method\", \"path_template\", \"status\"],\n388\t )\n389\t .expect(\"failed to create request_duration histogram\");\n390\t\n391\t let requests_total = CounterVec::new(\n392\t Opts::new(\"miroir_requests_total\", \"Total number of requests\"),\n393\t &[\"method\", \"path_template\", \"status\"],\n394\t )\n395\t .expect(\"failed to create requests_total counter\");\n396\t\n397\t let requests_in_flight = Gauge::with_opts(\n398\t Opts::new(\"miroir_requests_in_flight\", \"Number of requests currently being processed\"),\n399\t )\n400\t .expect(\"failed to create requests_in_flight gauge\");\n401\t\n402\t // ── Node health metrics ──\n403\t let node_healthy = GaugeVec::new(\n404\t Opts::new(\"miroir_node_healthy\", \"Health status of backend nodes (1=healthy, 0=unhealthy)\"),\n405\t &[\"node_id\"],\n406\t )\n407\t .expect(\"failed to create node_healthy gauge\");\n408\t\n409\t let node_request_duration = HistogramVec::new(\n410\t HistogramOpts::new(\"miroir_node_request_duration_seconds\", \"Latency of individual node requests\")\n411\t .buckets(vec![0.001, 0.005, 0.01, 0.025, 0.05, 0.1, 0.5, 1.0]),\n412\t &[\"node_id\", \"operation\"],\n413\t )\n414\t .expect(\"failed to create node_request_duration histogram\");\n415\t\n416\t let node_errors = CounterVec::new(\n417\t Opts::new(\"miroir_node_errors_total\", \"Number of errors from backend nodes\"),\n418\t &[\"node_id\", \"error_type\"],\n419\t )\n420\t .expect(\"failed to create node_errors counter\");\n421\t\n422\t // ── Shard metrics ──\n423\t let shard_coverage = Gauge::with_opts(\n424\t Opts::new(\"miroir_shard_coverage\", \"Fraction of shards with at least one healthy replica\"),\n425\t )\n426\t .expect(\"failed to create shard_coverage gauge\");\n427\t\n428\t let degraded_shards = Gauge::with_opts(\n429\t Opts::new(\"miroir_degraded_shards_total\", \"Number of shards with reduced replica availability\"),\n430\t )\n431\t .expect(\"failed to create degraded_shards gauge\");\n432\t\n433\t let shard_distribution = GaugeVec::new(\n434\t Opts::new(\"miroir_shard_distribution\", \"Number of shards assigned to each node\"),\n435\t &[\"node_id\"],\n436\t )\n437\t .expect(\"failed to create shard_distribution gauge\");\n438\t\n439\t // ── Task metrics ──\n440\t let task_processing_age = Histogram::with_opts(\n441\t HistogramOpts::new(\"miroir_task_processing_age_seconds\", \"Time between task creation and processing start\")\n442\t .buckets(vec![0.01, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0, 10.0, 30.0, 60.0]),\n443\t )\n444\t .expect(\"failed to create task_processing_age histogram\");\n445\t\n446\t let tasks_total = CounterVec::new(\n447\t Opts::new(\"miroir_tasks_total\", \"Total number of tasks by status\"),\n448\t &[\"status\"],\n449\t )\n450\t .expect(\"failed to create tasks_total counter\");\n451\t\n452\t let task_registry_size = Gauge::with_opts(\n453\t Opts::new(\"miroir_task_registry_size\", \"Current number of tasks in the registry\"),\n454\t )\n455\t .expect(\"failed to create task_registry_size gauge\");\n456\t\n457\t // ── Scatter-gather metrics ──\n458\t let scatter_fan_out_size = Histogram::with_opts(\n459\t HistogramOpts::new(\"miroir_scatter_fan_out_size\", \"Number of nodes in scatter operations\")\n460\t .buckets(vec![1.0, 2.0, 3.0, 5.0, 10.0, 20.0, 50.0]),\n461\t )\n462\t .expect(\"failed to create scatter_fan_out_size histogram\");\n463\t\n464\t let scatter_partial_responses = Counter::with_opts(\n465\t Opts::new(\"miroir_scatter_partial_responses_total\", \"Number of scatter responses that were partial (some nodes failed)\"),\n466\t )\n467\t .expect(\"failed to create scatter_partial_responses counter\");\n468\t\n469\t let scatter_retries = Counter::with_opts(\n470\t Opts::new(\"miroir_scatter_retries_total\", \"Number of scatter retry attempts due to node failures\"),\n471\t )\n472\t .expect(\"failed to create scatter_retries counter\");\n473\t\n474\t // ── Rebalancer metrics ──\n475\t let rebalance_in_progress = Gauge::with_opts(\n476\t Opts::new(\"miroir_rebalance_in_progress\", \"Whether a rebalance is currently running (1=yes, 0=no)\"),\n477\t )\n478\t .expect(\"failed to create rebalance_in_progress gauge\");\n479\t\n480\t let rebalance_documents_migrated = Counter::with_opts(\n481\t Opts::new(\"miroir_rebalance_documents_migrated_total\", \"Total number of documents migrated during rebalance\"),\n482\t )\n483\t .expect(\"failed to create rebalance_documents_migrated counter\");\n484\t\n485\t let rebalance_duration = Histogram::with_opts(\n486\t HistogramOpts::new(\"miroir_rebalance_duration_seconds\", \"Duration of rebalance operations\")\n487\t .buckets(vec![1.0, 5.0, 10.0, 30.0, 60.0, 300.0, 600.0, 1800.0, 3600.0]),\n488\t )\n489\t .expect(\"failed to create rebalance_duration histogram\");\n490\t\n491\t // Register all metrics\n492\t macro_rules! reg {\n493\t ($m:expr) => {\n494\t registry.register(Box::new($m.clone())).expect(concat!(\"failed to register \", stringify!($m)));\n495\t };\n496\t }\n497\t\n498\t reg!(request_duration);\n499\t reg!(requests_total);\n500\t reg!(requests_in_flight);\n501\t reg!(node_healthy);\n502\t reg!(node_request_duration);\n503\t reg!(node_errors);\n504\t reg!(shard_coverage);\n505\t reg!(degraded_shards);\n506\t reg!(shard_distribution);\n507\t reg!(task_processing_age);\n508\t reg!(tasks_total);\n509\t reg!(task_registry_size);\n510\t reg!(scatter_fan_out_size);\n511\t reg!(scatter_partial_responses);\n512\t reg!(scatter_retries);\n513\t reg!(rebalance_in_progress);\n514\t reg!(rebalance_documents_migrated);\n515\t reg!(rebalance_duration);\n516\t\n517\t // ── §13.11 Multi-search metrics (cardinality cap: top 100 tenants, rest bucketed) ──\n518\t let (\n519\t multisearch_queries_per_batch,\n520\t multisearch_batches_total,\n521\t multisearch_partial_failures_total,\n522\t multisearch_tenant_session_pin_override_total,\n523\t ) = if config.multi_search.enabled {\n524\t let q = Histogram::with_opts(\n525\t HistogramOpts::new(\"miroir_multisearch_queries_per_batch\", \"Number of queries in each multi-search batch\")\n526\t .buckets(vec![1.0, 2.0, 5.0, 10.0, 25.0, 50.0, 100.0]),\n527\t ).expect(\"create multisearch_queries_per_batch\");\n528\t let b = Counter::with_opts(\n529\t Opts::new(\"miroir_multisearch_batches_total\", \"Total number of multi-search batches processed\"),\n530\t ).expect(\"create multisearch_batches_total\");\n531\t let p = Counter::with_opts(\n532\t Opts::new(\"miroir_multisearch_partial_failures_total\", \"Number of multi-search batches with at least one query failure\"),\n533\t ).expect(\"create multisearch_partial_failures_total\");\n534\t let t = CounterVec::new(\n535\t Opts::new(\"miroir_tenant_session_pin_override_total\", \"Session pin overrides triggered by multi-search tenant routing\"),\n536\t &[\"tenant\"],\n537\t ).expect(\"create multisearch_tenant_session_pin_override_total\");\n538\t reg!(q); reg!(b); reg!(p); reg!(t);\n539\t (Some(q), Some(b), Some(p), Some(t))\n540\t } else {\n541\t (None, None, None, None)\n542\t };\n543\t\n544\t // ── §13.12 Vector search metrics ──\n545\t let (\n546\t vector_search_over_fetched_total,\n547\t vector_merge_strategy,\n548\t vector_embedder_drift_total,\n549\t ) = if config.vector_search.enabled {\n550\t let o = Counter::with_opts(\n551\t Opts::new(\"miroir_vector_search_over_fetched_total\", \"Number of vector searches that over-fetched candidates\"),\n552\t ).expect(\"create vector_search_over_fetched_total\");\n553\t let m = CounterVec::new(\n554\t Opts::new(\"miroir_vector_merge_strategy\", \"Count of hybrid merge strategy selections\"),\n555\t &[\"strategy\"],\n556\t ).expect(\"create vector_merge_strategy\");\n557\t let d = Counter::with_opts(\n558\t Opts::new(\"miroir_vector_embedder_drift_total\", \"Number of embedder drift detections\"),\n559\t ).expect(\"create vector_embedder_drift_total\");\n560\t reg!(o); reg!(m); reg!(d);\n561\t (Some(o), Some(m), Some(d))\n562\t } else {\n563\t (None, None, None)\n564\t };\n565\t\n566\t // ── §13.13 CDC metrics (cardinality cap: top 100 sinks, rest bucketed) ──\n567\t let (\n568\t cdc_events_published_total,\n569\t cdc_lag_seconds,\n570\t cdc_buffer_bytes,\n571\t cdc_dropped_total,\n572\t cdc_events_suppressed_total,\n573\t ) = if config.cdc.enabled {\n574\t let e = CounterVec::new(\n575\t Opts::new(\"miroir_cdc_events_published_total\", \"Total CDC events published\"),\n576\t &[\"sink\", \"index\"],\n577\t ).expect(\"create cdc_events_published_total\");\n578\t let l = GaugeVec::new(\n579\t Opts::new(\"miroir_cdc_lag_seconds\", \"CDC delivery lag in seconds\"),\n580\t &[\"sink\"],\n581\t ).expect(\"create cdc_lag_seconds\");\n582\t let b = GaugeVec::new(\n583\t Opts::new(\"miroir_cdc_buffer_bytes\", \"CDC buffer size in bytes\"),\n584\t &[\"sink\"],\n585\t ).expect(\"create cdc_buffer_bytes\");\n586\t let d = CounterVec::new(\n587\t Opts::new(\"miroir_cdc_dropped_total\", \"CDC events dropped due to buffer overflow\"),\n588\t &[\"sink\"],\n589\t ).expect(\"create cdc_dropped_total\");\n590\t let s = CounterVec::new(\n591\t Opts::new(\"miroir_cdc_events_suppressed_total\", \"CDC events suppressed by origin deduplication\"),\n592\t &[\"origin\"],\n593\t ).expect(\"create cdc_events_suppressed_total\");\n594\t reg!(e); reg!(l); reg!(b); reg!(d); reg!(s);\n595\t (Some(e), Some(l), Some(b), Some(d), Some(s))\n596\t } else {\n597\t (None, None, None, None, None)\n598\t };\n599\t\n600\t // ── §13.14 TTL metrics (cardinality cap: top 100 indexes, rest bucketed) ──\n601\t let (\n602\t ttl_documents_expired_total,\n603\t ttl_sweep_duration_seconds,\n604\t ttl_pending_estimate,\n605\t ) = if config.ttl.enabled {\n606\t let e = CounterVec::new(\n607\t Opts::new(\"miroir_ttl_documents_expired_total\", \"Documents expired by TTL sweeper\"),\n608\t &[\"index\"],\n609\t ).expect(\"create ttl_documents_expired_total\");\n610\t let d = HistogramVec::new(\n611\t HistogramOpts::new(\"miroir_ttl_sweep_duration_seconds\", \"Duration of TTL sweep cycles\")\n612\t .buckets(vec![0.01, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0, 10.0]),\n613\t &[\"index\"],\n614\t ).expect(\"create ttl_sweep_duration_seconds\");\n615\t let p = GaugeVec::new(\n616\t Opts::new(\"miroir_ttl_pending_estimate\", \"Estimated documents pending TTL expiry\"),\n617\t &[\"index\"],\n618\t ).expect(\"create ttl_pending_estimate\");\n619\t reg!(e); reg!(d); reg!(p);\n620\t (Some(e), Some(d), Some(p))\n621\t } else {\n622\t (None, None, None)\n623\t };\n624\t\n625\t // ── §13.15 Tenant affinity metrics (cardinality cap: top 100 tenants, rest bucketed) ──\n626\t let (\n627\t tenant_queries_total,\n628\t tenant_pinned_groups,\n629\t tenant_fallback_total,\n630\t ) = if config.tenant_affinity.enabled {\n631\t let q = CounterVec::new(\n632\t Opts::new(\"miroir_tenant_queries_total\", \"Queries routed per tenant and group\"),\n633\t &[\"tenant\", \"group\"],\n634\t ).expect(\"create tenant_queries_total\");\n635\t let p = GaugeVec::new(\n636\t Opts::new(\"miroir_tenant_pinned_groups\", \"Current pinned group per tenant\"),\n637\t &[\"tenant\"],\n638\t ).expect(\"create tenant_pinned_groups\");\n639\t let f = CounterVec::new(\n640\t Opts::new(\"miroir_tenant_fallback_total\", \"Tenant affinity fallback invocations\"),\n641\t &[\"reason\"],\n642\t ).expect(\"create tenant_fallback_total\");\n643\t reg!(q); reg!(p); reg!(f);\n644\t (Some(q), Some(p), Some(f))\n645\t } else {\n646\t (None, None, None)\n647\t };\n648\t\n649\t // ── §13.16 Shadow traffic metrics ──\n650\t let (\n651\t shadow_diff_total,\n652\t shadow_kendall_tau,\n653\t shadow_latency_delta_seconds,\n654\t shadow_errors_total,\n655\t ) = if config.shadow.enabled {\n656\t let d = CounterVec::new(\n657\t Opts::new(\"miroir_shadow_diff_total\", \"Shadow comparison diffs by kind\"),\n658\t &[\"kind\"],\n659\t ).expect(\"create shadow_diff_total\");\n660\t let k = Gauge::with_opts(\n661\t Opts::new(\"miroir_shadow_kendall_tau\", \"Kendall tau rank correlation between shadow and primary\"),\n662\t ).expect(\"create shadow_kendall_tau\");\n663\t let l = Histogram::with_opts(\n664\t HistogramOpts::new(\"miroir_shadow_latency_delta_seconds\", \"Latency difference between shadow and primary\")\n665\t .buckets(vec![-1.0, -0.5, -0.1, -0.01, 0.0, 0.01, 0.1, 0.5, 1.0]),\n666\t ).expect(\"create shadow_latency_delta_seconds\");\n667\t let e = CounterVec::new(\n668\t Opts::new(\"miroir_shadow_errors_total\", \"Shadow pipeline errors\"),\n669\t &[\"target\", \"side\"],\n670\t ).expect(\"create shadow_errors_total\");\n671\t reg!(d); reg!(k); reg!(l); reg!(e);\n672\t (Some(d), Some(k), Some(l), Some(e))\n673\t } else {\n674\t (None, None, None, None)\n675\t };\n676\t\n677\t // ── §13.17 ILM metrics (cardinality cap: top 100 policies/aliases, rest bucketed) ──\n678\t let (\n679\t rollover_events_total,\n680\t rollover_active_indexes,\n681\t rollover_documents_expired_total,\n682\t rollover_last_action_seconds,\n683\t ) = if config.ilm.enabled {\n684\t let e = CounterVec::new(\n685\t Opts::new(\"miroir_rollover_events_total\", \"ILM rollover events\"),\n686\t &[\"policy\"],\n687\t ).expect(\"create rollover_events_total\");\n688\t let a = GaugeVec::new(\n689\t Opts::new(\"miroir_rollover_active_indexes\", \"Active write indexes per alias\"),\n690\t &[\"alias\"],\n691\t ).expect(\"create rollover_active_indexes\");\n692\t let d = CounterVec::new(\n693\t Opts::new(\"miroir_rollover_documents_expired_total\", \"Documents expired by ILM retention policies\"),\n694\t &[\"policy\"],\n695\t ).expect(\"create rollover_documents_expired_total\");\n696\t let l = GaugeVec::new(\n697\t Opts::new(\"miroir_rollover_last_action_seconds\", \"Seconds since last rollover action per policy\"),\n698\t &[\"policy\"],\n699\t ).expect(\"create rollover_last_action_seconds\");\n700\t reg!(e); reg!(a); reg!(d); reg!(l);\n701\t (Some(e), Some(a), Some(d), Some(l))\n702\t } else {\n703\t (None, None, None, None)\n704\t };\n705\t\n706\t // ── §13.18 Canary metrics (cardinality cap: top 100 canaries, rest bucketed) ──\n707\t let (\n708\t canary_runs_total,\n709\t canary_latency_ms,\n710\t canary_assertion_failures_total,\n711\t ) = if config.canary_runner.enabled {\n712\t let r = CounterVec::new(\n713\t Opts::new(\"miroir_canary_runs_total\", \"Canary run results\"),\n714\t &[\"canary\", \"result\"],\n715\t ).expect(\"create canary_runs_total\");\n716\t let l = HistogramVec::new(\n717\t HistogramOpts::new(\"miroir_canary_latency_ms\", \"Canary execution latency\")\n718\t .buckets(vec![1.0, 5.0, 10.0, 25.0, 50.0, 100.0, 250.0, 500.0, 1000.0]),\n719\t &[\"canary\"],\n720\t ).expect(\"create canary_latency_ms\");\n721\t let a = CounterVec::new(\n722\t Opts::new(\"miroir_canary_assertion_failures_total\", \"Canary assertion failures\"),\n723\t &[\"canary\", \"assertion_type\"],\n724\t ).expect(\"create canary_assertion_failures_total\");\n725\t reg!(r); reg!(l); reg!(a);\n726\t (Some(r), Some(l), Some(a))\n727\t } else {\n728\t (None, None, None)\n729\t };\n730\t\n731\t // ── §13.19 Admin UI metrics ──\n732\t let (\n733\t admin_ui_sessions_total,\n734\t admin_ui_action_total,\n735\t admin_ui_destructive_action_total,\n736\t ) = if config.admin_ui.enabled {\n737\t let s = Counter::with_opts(\n738\t Opts::new(\"miroir_admin_ui_sessions_total\", \"Admin UI sessions started\"),\n739\t ).expect(\"create admin_ui_sessions_total\");\n740\t let a = CounterVec::new(\n741\t Opts::new(\"miroir_admin_ui_action_total\", \"Admin UI actions by type\"),\n742\t &[\"action\"],\n743\t ).expect(\"create admin_ui_action_total\");\n744\t let d = CounterVec::new(\n745\t Opts::new(\"miroir_admin_ui_destructive_action_total\", \"Admin UI destructive actions (delete, drop, etc.)\"),\n746\t &[\"action\"],\n747\t ).expect(\"create admin_ui_destructive_action_total\");\n748\t reg!(s); reg!(a); reg!(d);\n749\t (Some(s), Some(a), Some(d))\n750\t } else {\n751\t (None, None, None)\n752\t };\n753\t\n754\t // ── §13.20 Explain metrics ──\n755\t let (\n756\t explain_requests_total,\n757\t explain_warnings_total,\n758\t explain_execute_total,\n759\t ) = if config.explain.enabled {\n760\t let r = Counter::with_opts(\n761\t Opts::new(\"miroir_explain_requests_total\", \"Explain API requests\"),\n762\t ).expect(\"create explain_requests_total\");\n763\t let w = CounterVec::new(\n764\t Opts::new(\"miroir_explain_warnings_total\", \"Explain warnings by type\"),\n765\t &[\"warning_type\"],\n766\t ).expect(\"create explain_warnings_total\");\n767\t let e = Counter::with_opts(\n768\t Opts::new(\"miroir_explain_execute_total\", \"Explain requests with execute=true\"),\n769\t ).expect(\"create explain_execute_total\");\n770\t reg!(r); reg!(w); reg!(e);\n771\t (Some(r), Some(w), Some(e))\n772\t } else {\n773\t (None, None, None)\n774\t };\n775\t\n776\t // ── §13.21 Search UI metrics (cardinality cap: top 100 indexes, rest bucketed) ──\n777\t let (\n778\t search_ui_sessions_total,\n779\t search_ui_queries_total,\n780\t search_ui_zero_hits_total,\n781\t search_ui_click_through_total,\n782\t search_ui_p95_ms,\n783\t ) = if config.search_ui.enabled {\n784\t let s = Counter::with_opts(\n785\t Opts::new(\"miroir_search_ui_sessions_total\", \"Search UI sessions\"),\n786\t ).expect(\"create search_ui_sessions_total\");\n787\t let q = CounterVec::new(\n788\t Opts::new(\"miroir_search_ui_queries_total\", \"Search UI queries per index\"),\n789\t &[\"index\"],\n790\t ).expect(\"create search_ui_queries_total\");\n791\t let z = CounterVec::new(\n792\t Opts::new(\"miroir_search_ui_zero_hits_total\", \"Search UI zero-hit queries per index\"),\n793\t &[\"index\"],\n794\t ).expect(\"create search_ui_zero_hits_total\");\n795\t let c = CounterVec::new(\n796\t Opts::new(\"miroir_search_ui_click_through_total\", \"Search UI click-through events per index\"),\n797\t &[\"index\"],\n798\t ).expect(\"create search_ui_click_through_total\");\n799\t let p = GaugeVec::new(\n800\t Opts::new(\"miroir_search_ui_p95_ms\", \"Search UI p95 query latency per index\"),\n801\t &[\"index\"],\n802\t ).expect(\"create search_ui_p95_ms\");\n803\t reg!(s); reg!(q); reg!(z); reg!(c); reg!(p);\n804\t (Some(s), Some(q), Some(z), Some(c), Some(p))\n805\t } else {\n806\t (None, None, None, None, None)\n807\t };\n808\t\n809\t // ── §14.9 Resource-pressure metrics (always present) ──\n810\t let memory_pressure = Gauge::with_opts(\n811\t Opts::new(\"miroir_memory_pressure\", \"Memory pressure level (0=none, 1=low, 2=moderate/high)\")\n812\t ).expect(\"create memory_pressure\");\n813\t let cpu_throttled_seconds_total = Counter::with_opts(\n814\t Opts::new(\"miroir_cpu_throttled_seconds_total\", \"Total seconds of CPU throttling\")\n815\t ).expect(\"create cpu_throttled_seconds_total\");\n816\t let request_queue_depth = Gauge::with_opts(\n817\t Opts::new(\"miroir_request_queue_depth\", \"Number of requests queued waiting for processing\")\n818\t ).expect(\"create request_queue_depth\");\n819\t let background_queue_depth = GaugeVec::new(\n820\t Opts::new(\"miroir_background_queue_depth\", \"Number of background jobs queued by type\"),\n821\t &[\"job_type\"],\n822\t ).expect(\"create background_queue_depth\");\n823\t let peer_pod_count = Gauge::with_opts(\n824\t Opts::new(\"miroir_peer_pod_count\", \"Number of peer miroir pods discovered\")\n825\t ).expect(\"create peer_pod_count\");\n826\t let leader = Gauge::with_opts(\n827\t Opts::new(\"miroir_leader\", \"Whether this pod holds the leader lease (1=yes, 0=no)\")\n828\t ).expect(\"create leader\");\n829\t let owned_shards_count = Gauge::with_opts(\n830\t Opts::new(\"miroir_owned_shards_count\", \"Number of shards owned by this pod\")\n831\t ).expect(\"create owned_shards_count\");\n832\t reg!(memory_pressure);\n833\t reg!(cpu_throttled_seconds_total);\n834\t reg!(request_queue_depth);\n835\t reg!(background_queue_depth);\n836\t reg!(peer_pod_count);\n837\t reg!(leader);\n838\t reg!(owned_shards_count);\n839\t\n840\t // ── Admin session sealing metrics (always present) ──\n841\t let admin_session_key_generated = Gauge::with_opts(\n842\t Opts::new(\"miroir_admin_session_key_generated\",\n843\t \"Whether ADMIN_SESSION_SEAL_KEY was generated at startup (1=yes, 0=set via env)\")\n844\t ).expect(\"create admin_session_key_generated\");\n845\t let admin_session_revoked_total = Counter::with_opts(\n846\t Opts::new(\"miroir_admin_session_revoked_total\",\n847\t \"Admin sessions revoked via logout\")\n848\t ).expect(\"create admin_session_revoked_total\");\n849\t reg!(admin_session_key_generated);\n850\t reg!(admin_session_revoked_total);\n851\t\n852\t // ── §13.5 Two-phase settings broadcast metrics (always present) ──\n853\t let settings_broadcast_phase = GaugeVec::new(\n854\t Opts::new(\"miroir_settings_broadcast_phase\", \"Current phase of settings broadcast (0=idle, 1=propose, 2=verify, 3=commit)\"),\n855\t &[\"index\"],\n856\t ).expect(\"create settings_broadcast_phase\");\n857\t let settings_hash_mismatch_total = Counter::with_opts(\n858\t Opts::new(\"miroir_settings_hash_mismatch_total\", \"Settings hash mismatches detected during verify phase\"),\n859\t ).expect(\"create settings_hash_mismatch_total\");\n860\t let settings_drift_repair_total = CounterVec::new(\n861\t Opts::new(\"miroir_settings_drift_repair_total\", \"Settings drift repairs performed by drift reconciler\"),\n862\t &[\"index\"],\n863\t ).expect(\"create settings_drift_repair_total\");\n864\t let settings_version = GaugeVec::new(\n865\t Opts::new(\"miroir_settings_version\", \"Current settings version per index\"),\n866\t &[\"index\"],\n867\t ).expect(\"create settings_version\");\n868\t reg!(settings_broadcast_phase);\n869\t reg!(settings_hash_mismatch_total);\n870\t reg!(settings_drift_repair_total);\n871\t reg!(settings_version);\n872\t\n873\t // ── §13.7 Alias metrics (always present) ──\n874\t let alias_resolutions_total = CounterVec::new(\n875\t Opts::new(\"miroir_alias_resolutions_total\", \"Number of alias resolutions\"),\n876\t &[\"alias\"],\n877\t ).expect(\"create alias_resolutions_total\");\n878\t let alias_flips_total = CounterVec::new(\n879\t Opts::new(\"miroir_alias_flips_total\", \"Number of alias flips\"),\n880\t &[\"alias\"],\n881\t ).expect(\"create alias_flips_total\");\n882\t reg!(alias_resolutions_total);\n883\t reg!(alias_flips_total);\n884\t\n885\t // ── §13.6 Session pinning metrics (always present) ──\n886\t let session_active_count = Gauge::new(\n887\t \"miroir_session_active_count\",\n888\t \"Number of active sessions\",\n889\t ).expect(\"create session_active_count\");\n890\t let session_pin_enforced_total = CounterVec::new(\n891\t Opts::new(\"miroir_session_pin_enforced_total\", \"Number of times session pin was enforced\"),\n892\t &[\"strategy\"],\n893\t ).expect(\"create session_pin_enforced_total\");\n894\t let session_wait_duration_seconds = Histogram::with_opts(\n895\t HistogramOpts::new(\n896\t \"miroir_session_wait_duration_seconds\",\n897\t \"Duration of session pin wait operations\",\n898\t )\n899\t .buckets(vec![0.001, 0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0]),\n900\t ).expect(\"create session_wait_duration_seconds\");\n901\t let session_wait_timeout_total = CounterVec::new(\n902\t Opts::new(\"miroir_session_wait_timeout_total\", \"Number of session pin wait timeouts\"),\n903\t &[\"strategy\"],\n904\t ).expect(\"create session_wait_timeout_total\");\n905\t reg!(session_active_count);\n906\t reg!(session_pin_enforced_total);\n907\t reg!(session_wait_duration_seconds);\n908\t reg!(session_wait_timeout_total);\n909\t\n910\t Self {\n911\t registry,\n912\t request_duration,\n913\t requests_total,\n914\t requests_in_flight,\n915\t node_healthy,\n916\t node_request_duration,\n917\t node_errors,\n918\t shard_coverage,\n919\t degraded_shards,\n920\t shard_distribution,\n921\t task_processing_age,\n922\t tasks_total,\n923\t task_registry_size,\n924\t scatter_fan_out_size,\n925\t scatter_partial_responses,\n926\t scatter_retries,\n927\t rebalance_in_progress,\n928\t rebalance_documents_migrated,\n929\t rebalance_duration,\n930\t multisearch_queries_per_batch,\n931\t multisearch_batches_total,\n932\t multisearch_partial_failures_total,\n933\t multisearch_tenant_session_pin_override_total,\n934\t vector_search_over_fetched_total,\n935\t vector_merge_strategy,\n936\t vector_embedder_drift_total,\n937\t cdc_events_published_total,\n938\t cdc_lag_seconds,\n939\t cdc_buffer_bytes,\n940\t cdc_dropped_total,\n941\t cdc_events_suppressed_total,\n942\t ttl_documents_expired_total,\n943\t ttl_sweep_duration_seconds,\n944\t ttl_pending_estimate,\n945\t tenant_queries_total,\n946\t tenant_pinned_groups,\n947\t tenant_fallback_total,\n948\t shadow_diff_total,\n949\t shadow_kendall_tau,\n950\t shadow_latency_delta_seconds,\n951\t shadow_errors_total,\n952\t rollover_events_total,\n953\t rollover_active_indexes,\n954\t rollover_documents_expired_total,\n955\t rollover_last_action_seconds,\n956\t canary_runs_total,\n957\t canary_latency_ms,\n958\t canary_assertion_failures_total,\n959\t admin_ui_sessions_total,\n960\t admin_ui_action_total,\n961\t admin_ui_destructive_action_total,\n962\t explain_requests_total,\n963\t explain_warnings_total,\n964\t explain_execute_total,\n965\t search_ui_sessions_total,\n966\t search_ui_queries_total,\n967\t search_ui_zero_hits_total,\n968\t search_ui_click_through_total,\n969\t search_ui_p95_ms,\n970\t memory_pressure,\n971\t cpu_throttled_seconds_total,\n972\t request_queue_depth,\n973\t background_queue_depth,\n974\t peer_pod_count,\n975\t leader,\n976\t owned_shards_count,\n977\t admin_session_key_generated,\n978\t admin_session_revoked_total,\n979\t settings_broadcast_phase,\n980\t settings_hash_mismatch_total,\n981\t settings_drift_repair_total,\n982\t settings_version,\n983\t alias_resolutions_total,\n984\t alias_flips_total,\n985\t session_active_count,\n986\t session_pin_enforced_total,\n987\t session_wait_duration_seconds,\n988\t session_wait_timeout_total,\n989\t }\n990\t }\n991\t\n992\t pub fn encode_metrics(&self) -> Result {\n993\t let encoder = TextEncoder::new();\n994\t let metric_families = self.registry.gather();\n995\t let mut buffer = Vec::new();\n996\t encoder.encode(&metric_families, &mut buffer)?;\n997\t Ok(String::from_utf8(buffer).map_err(|e| {\n998\t prometheus::Error::Msg(format!(\"failed to convert metrics to UTF-8: {}\", e))\n999\t })?)\n1000\t }\n1001\t\n1002\t pub fn admin_session_key_generated(&self) -> Gauge {\n1003\t self.admin_session_key_generated.clone()\n1004\t }\n1005\t\n1006\t pub fn admin_session_revoked_total(&self) -> Counter {\n1007\t self.admin_session_revoked_total.clone()\n1008\t }\n1009\t}\n1010\t\n1011\t/// Generate a short request ID from UUIDv7.\n1012\t///\n1013\t/// UUIDv7 provides time-ordered unique IDs. We take the first 8 hex characters,\n1014\t/// hash them, and encode as hex for a short, URL-safe identifier.\n1015\tpub fn generate_request_id() -> String {\n1016\t let uuid = Uuid::now_v7();\n1017\t let uuid_str = uuid.simple().to_string();\n1018\t // Take first 8 chars (enough entropy for uniqueness)\n1019\t let prefix = &uuid_str[..8];\n1020\t\n1021\t // Hash to get a consistent short representation\n1022\t let mut hasher = DefaultHasher::new();\n1023\t prefix.hash(&mut hasher);\n1024\t let hash = hasher.finish();\n1025\t\n1026\t // Encode as hex (16 chars = 64 bits)\n1027\t format!(\"{:016x}\", hash)\n1028\t}\n1029\t\n1030\t/// Extension trait to add request ID extraction utilities.\n1031\tpub trait RequestIdExt {\n1032\t fn get_request_id(&self) -> Option;\n1033\t fn set_request_id(&mut self, id: &str);\n1034\t}\n1035\t\n1036\timpl RequestIdExt for HeaderMap {\n1037\t fn get_request_id(&self) -> Option {\n1038\t self.get(\"x-request-id\")\n1039\t .and_then(|v| v.to_str().ok())\n1040\t .map(|s| s.to_string())\n1041\t }\n1042\t\n1043\t fn set_request_id(&mut self, id: &str) {\n1044\t if let Ok(val) = HeaderValue::from_str(id) {\n1045\t self.insert(\"x-request-id\", val);\n1046\t }\n1047\t }\n1048\t}\n1049\t\n1050\t/// Guard that decrements the in-flight gauge when dropped.\n1051\t///\n1052\t/// This ensures that even if the handler panics, the in-flight count\n1053\t/// is accurately decremented.\n1054\tstruct InFlightGuard {\n1055\t metrics: Metrics,\n1056\t request_id: String,\n1057\t}\n1058\t\n1059\timpl InFlightGuard {\n1060\t fn new(metrics: Metrics, request_id: String) -> Self {\n1061\t metrics.requests_in_flight.inc();\n1062\t tracing::trace!(\n1063\t request_id = %request_id,\n1064\t requests_in_flight = metrics.requests_in_flight.get(),\n1065\t \"request started\"\n1066\t );\n1067\t Self { metrics, request_id }\n1068\t }\n1069\t}\n1070\t\n1071\timpl Drop for InFlightGuard {\n1072\t fn drop(&mut self) {\n1073\t self.metrics.requests_in_flight.dec();\n1074\t tracing::trace!(\n1075\t request_id = %self.request_id,\n1076\t requests_in_flight = self.metrics.requests_in_flight.get(),\n1077\t \"request completed\"\n1078\t );\n1079\t }\n1080\t}\n1081\t\n1082\t/// Extract the path template from the matched route.\n1083\t///\n1084\t/// Axum's MatchedPath extractor provides the route template (e.g., \"/indexes/{uid}/search\")\n1085\t/// instead of the actual path (e.g., \"/indexes/products/search\"), avoiding high-cardinality labels.\n1086\tfn extract_path_template(request: &Request) -> String {\n1087\t request\n1088\t .extensions()\n1089\t .get::()\n1090\t .map(|mp| mp.as_str())\n1091\t .unwrap_or_else(|| request.uri().path())\n1092\t .to_string()\n1093\t}\n1094\t\n1095\t/// Main middleware that combines request ID injection, structured logging, and Prometheus metrics.\n1096\t///\n1097\t/// IMPORTANT: This middleware must be applied AFTER request_id_middleware in the layer stack\n1098\t/// (i.e., its layer() call must come BEFORE request_id_middleware's layer() call).\n1099\t/// This ensures the request_id header is already set when this middleware runs.\n1100\tpub async fn telemetry_middleware(\n1101\t State(telemetry): State,\n1102\t mut req: Request,\n1103\t next: Next,\n1104\t) -> Response {\n1105\t let start = Instant::now();\n1106\t let method = req.method().clone();\n1107\t let path_template = extract_path_template(&req);\n1108\t let metrics = telemetry.metrics.clone();\n1109\t let pod_id = telemetry.pod_id.clone();\n1110\t\n1111\t // Extract request ID from header (set by request_id_middleware)\n1112\t // The header must already exist because request_id_middleware runs first.\n1113\t let request_id = req\n1114\t .headers()\n1115\t .get_request_id()\n1116\t .expect(\"request_id header must be set by request_id_middleware\");\n1117\t req.headers_mut().set_request_id(&request_id);\n1118\t\n1119\t // Create span for structured logging with pod_id included.\n1120\t // Note: raw path is intentionally omitted to avoid logging index names\n1121\t // (which may contain customer identifiers). Use path_template instead.\n1122\t let span = info_span!(\n1123\t \"request\",\n1124\t request_id = %request_id,\n1125\t pod_id = %pod_id,\n1126\t method = %method,\n1127\t path_template = %path_template,\n1128\t );\n1129\t\n1130\t let _guard = span.enter();\n1131\t\n1132\t // Track in-flight requests\n1133\t let in_flight = InFlightGuard::new(metrics.clone(), request_id.clone());\n1134\t\n1135\t let response = next.run(req).await;\n1136\t\n1137\t drop(in_flight);\n1138\t\n1139\t let status = response.status();\n1140\t let status_u16 = status.as_u16();\n1141\t let duration = start.elapsed();\n1142\t\n1143\t // Record Prometheus metrics\n1144\t metrics\n1145\t .request_duration\n1146\t .with_label_values(&[method.as_str(), &path_template, &status_u16.to_string()])\n1147\t .observe(duration.as_secs_f64());\n1148\t metrics\n1149\t .requests_total\n1150\t .with_label_values(&[method.as_str(), &path_template, &status_u16.to_string()])\n1151\t .inc();\n1152\t\n1153\t // Structured log entry (plan §10 shape)\n1154\t // Base fields: timestamp (from tracing-subscriber), level, message, duration_ms\n1155\t // Additional fields (index, node_count, estimated_hits, degraded)\n1156\t // are added by request handlers via the tracing span.\n1157\t let message = format!(\"{} {}\", method, status);\n1158\t if status.is_server_error() {\n1159\t tracing::error!(\n1160\t target: \"miroir.request\",\n1161\t pod_id = %pod_id,\n1162\t request_id = %request_id,\n1163\t message = %message,\n1164\t duration_ms = duration.as_millis() as u64,\n1165\t status = status_u16,\n1166\t method = %method,\n1167\t path_template = %path_template,\n1168\t );\n1169\t } else if status.is_client_error() {\n1170\t tracing::warn!(\n1171\t target: \"miroir.request\",\n1172\t pod_id = %pod_id,\n1173\t request_id = %request_id,\n1174\t message = %message,\n1175\t duration_ms = duration.as_millis() as u64,\n1176\t status = status_u16,\n1177\t method = %method,\n1178\t path_template = %path_template,\n1179\t );\n1180\t } else {\n1181\t tracing::info!(\n1182\t target: \"miroir.request\",\n1183\t pod_id = %pod_id,\n1184\t request_id = %request_id,\n1185\t message = %message,\n1186\t duration_ms = duration.as_millis() as u64,\n1187\t status = status_u16,\n1188\t method = %method,\n1189\t path_template = %path_template,\n1190\t );\n1191\t }\n1192\t\n1193\t // Ensure request ID is in response headers\n1194\t let mut response = response;\n1195\t if !response.headers().contains_key(\"x-request-id\") {\n1196\t if let Ok(val) = HeaderValue::from_str(&request_id) {\n1197\t response.headers_mut().insert(\"x-request-id\", val);\n1198\t }\n1199\t }\n1200\t\n1201\t response\n1202\t}\n1203\t\n1204\t/// Create the metrics router for the :9090 server.\n1205\tpub fn metrics_router() -> Router {\n1206\t Router::new().route(\"/metrics\", get(metrics_handler))\n1207\t}\n1208\t\n1209\t/// Handler that returns Prometheus metrics in text exposition format.\n1210\tasync fn metrics_handler(State(metrics): State) -> String {\n1211\t match metrics.encode_metrics() {\n1212\t Ok(metrics) => metrics,\n1213\t Err(e) => {\n1214\t tracing::error!(error = %e, \"failed to encode metrics\");\n1215\t format!(\"# ERROR: failed to encode metrics: {}\\n\", e)\n1216\t }\n1217\t }\n1218\t}\n1219\t\n1220\t/// Accessor methods for metrics that can be used by other parts of the application.\n1221\timpl Metrics {\n1222\t // ── Request metrics ──\n1223\t\n1224\t pub fn record_request_duration(&self, method: &str, path_template: &str, status: u16, duration_secs: f64) {\n1225\t self.request_duration.with_label_values(&[method, path_template, &status.to_string()]).observe(duration_secs);\n1226\t }\n1227\t\n1228\t pub fn inc_requests_total(&self, method: &str, path_template: &str, status: u16) {\n1229\t self.requests_total.with_label_values(&[method, path_template, &status.to_string()]).inc();\n1230\t }\n1231\t\n1232\t // ── Scatter-gather ──\n1233\t\n1234\t pub fn record_scatter_fan_out(&self, size: u64) {\n1235\t self.scatter_fan_out_size.observe(size as f64);\n1236\t }\n1237\t\n1238\t pub fn inc_scatter_partial_responses(&self) {\n1239\t self.scatter_partial_responses.inc();\n1240\t }\n1241\t\n1242\t pub fn inc_scatter_retries(&self) {\n1243\t self.scatter_retries.inc();\n1244\t }\n1245\t\n1246\t // ── Node health ──\n1247\t\n1248\t pub fn set_node_healthy(&self, node_id: &str, healthy: bool) {\n1249\t self.node_healthy.with_label_values(&[node_id]).set(if healthy { 1.0 } else { 0.0 });\n1250\t }\n1251\t\n1252\t pub fn record_node_request_duration(&self, node_id: &str, operation: &str, duration_secs: f64) {\n1253\t self.node_request_duration.with_label_values(&[node_id, operation]).observe(duration_secs);\n1254\t }\n1255\t\n1256\t pub fn inc_node_errors(&self, node_id: &str, error_type: &str) {\n1257\t self.node_errors.with_label_values(&[node_id, error_type]).inc();\n1258\t }\n1259\t\n1260\t // ── Shards ──\n1261\t\n1262\t pub fn set_shard_coverage(&self, coverage: f64) {\n1263\t self.shard_coverage.set(coverage);\n1264\t }\n1265\t\n1266\t pub fn set_degraded_shards(&self, count: f64) {\n1267\t self.degraded_shards.set(count);\n1268\t }\n1269\t\n1270\t pub fn set_shard_distribution(&self, node_id: &str, count: f64) {\n1271\t self.shard_distribution.with_label_values(&[node_id]).set(count);\n1272\t }\n1273\t\n1274\t // ── Tasks ──\n1275\t\n1276\t pub fn observe_task_processing_age(&self, age_secs: f64) {\n1277\t self.task_processing_age.observe(age_secs);\n1278\t }\n1279\t\n1280\t pub fn inc_tasks_total(&self, status: &str) {\n1281\t self.tasks_total.with_label_values(&[status]).inc();\n1282\t }\n1283\t\n1284\t pub fn set_task_registry_size(&self, size: f64) {\n1285\t self.task_registry_size.set(size);\n1286\t }\n1287\t\n1288\t // ── Rebalancer ──\n1289\t\n1290\t pub fn set_rebalance_in_progress(&self, v: bool) {\n1291\t self.rebalance_in_progress.set(if v { 1.0 } else { 0.0 });\n1292\t }\n1293\t\n1294\t pub fn inc_rebalance_documents_migrated(&self, count: u64) {\n1295\t self.rebalance_documents_migrated.inc_by(count as f64);\n1296\t }\n1297\t\n1298\t pub fn observe_rebalance_duration(&self, secs: f64) {\n1299\t self.rebalance_duration.observe(secs);\n1300\t }\n1301\t\n1302\t // ── §13.11 Multi-search ──\n1303\t\n1304\t pub fn observe_multisearch_queries_per_batch(&self, count: u64) {\n1305\t if let Some(ref m) = self.multisearch_queries_per_batch {\n1306\t m.observe(count as f64);\n1307\t }\n1308\t }\n1309\t\n1310\t pub fn inc_multisearch_batches_total(&self) {\n1311\t if let Some(ref m) = self.multisearch_batches_total {\n1312\t m.inc();\n1313\t }\n1314\t }\n1315\t\n1316\t pub fn inc_multisearch_partial_failures(&self) {\n1317\t if let Some(ref m) = self.multisearch_partial_failures_total {\n1318\t m.inc();\n1319\t }\n1320\t }\n1321\t\n1322\t pub fn inc_multisearch_tenant_session_pin_override(&self, tenant: &str) {\n1323\t if let Some(ref m) = self.multisearch_tenant_session_pin_override_total {\n1324\t m.with_label_values(&[tenant]).inc();\n1325\t }\n1326\t }\n1327\t\n1328\t // ── §13.12 Vector search ──\n1329\t\n1330\t pub fn inc_vector_search_over_fetched(&self) {\n1331\t if let Some(ref m) = self.vector_search_over_fetched_total {\n1332\t m.inc();\n1333\t }\n1334\t }\n1335\t\n1336\t pub fn inc_vector_merge_strategy(&self, strategy: &str) {\n1337\t if let Some(ref m) = self.vector_merge_strategy {\n1338\t m.with_label_values(&[strategy]).inc();\n1339\t }\n1340\t }\n1341\t\n1342\t pub fn inc_vector_embedder_drift(&self) {\n1343\t if let Some(ref m) = self.vector_embedder_drift_total {\n1344\t m.inc();\n1345\t }\n1346\t }\n1347\t\n1348\t // ── §13.13 CDC ──\n1349\t\n1350\t pub fn inc_cdc_events_published(&self, sink: &str, index: &str) {\n1351\t if let Some(ref m) = self.cdc_events_published_total {\n1352\t m.with_label_values(&[sink, index]).inc();\n1353\t }\n1354\t }\n1355\t\n1356\t pub fn set_cdc_lag_seconds(&self, sink: &str, lag: f64) {\n1357\t if let Some(ref m) = self.cdc_lag_seconds {\n1358\t m.with_label_values(&[sink]).set(lag);\n1359\t }\n1360\t }\n1361\t\n1362\t pub fn set_cdc_buffer_bytes(&self, sink: &str, bytes: f64) {\n1363\t if let Some(ref m) = self.cdc_buffer_bytes {\n1364\t m.with_label_values(&[sink]).set(bytes);\n1365\t }\n1366\t }\n1367\t\n1368\t pub fn inc_cdc_dropped(&self, sink: &str) {\n1369\t if let Some(ref m) = self.cdc_dropped_total {\n1370\t m.with_label_values(&[sink]).inc();\n1371\t }\n1372\t }\n1373\t\n1374\t pub fn inc_cdc_events_suppressed(&self, origin: &str) {\n1375\t if let Some(ref m) = self.cdc_events_suppressed_total {\n1376\t m.with_label_values(&[origin]).inc();\n1377\t }\n1378\t }\n1379\t\n1380\t // ── §13.14 TTL ──\n1381\t\n1382\t pub fn inc_ttl_documents_expired(&self, index: &str) {\n1383\t if let Some(ref m) = self.ttl_documents_expired_total {\n1384\t m.with_label_values(&[index]).inc();\n1385\t }\n1386\t }\n1387\t\n1388\t pub fn observe_ttl_sweep_duration(&self, index: &str, secs: f64) {\n1389\t if let Some(ref m) = self.ttl_sweep_duration_seconds {\n1390\t m.with_label_values(&[index]).observe(secs);\n1391\t }\n1392\t }\n1393\t\n1394\t pub fn set_ttl_pending_estimate(&self, index: &str, count: f64) {\n1395\t if let Some(ref m) = self.ttl_pending_estimate {\n1396\t m.with_label_values(&[index]).set(count);\n1397\t }\n1398\t }\n1399\t\n1400\t // ── §13.15 Tenant affinity ──\n1401\t\n1402\t pub fn inc_tenant_queries(&self, tenant: &str, group: &str) {\n1403\t if let Some(ref m) = self.tenant_queries_total {\n1404\t m.with_label_values(&[tenant, group]).inc();\n1405\t }\n1406\t }\n1407\t\n1408\t pub fn set_tenant_pinned_groups(&self, tenant: &str, group: u32) {\n1409\t if let Some(ref m) = self.tenant_pinned_groups {\n1410\t m.with_label_values(&[tenant]).set(group as f64);\n1411\t }\n1412\t }\n1413\t\n1414\t pub fn inc_tenant_fallback(&self, reason: &str) {\n1415\t if let Some(ref m) = self.tenant_fallback_total {\n1416\t m.with_label_values(&[reason]).inc();\n1417\t }\n1418\t }\n1419\t\n1420\t // ── §13.16 Shadow ──\n1421\t\n1422\t pub fn inc_shadow_diff(&self, kind: &str) {\n1423\t if let Some(ref m) = self.shadow_diff_total {\n1424\t m.with_label_values(&[kind]).inc();\n1425\t }\n1426\t }\n1427\t\n1428\t pub fn set_shadow_kendall_tau(&self, tau: f64) {\n1429\t if let Some(ref m) = self.shadow_kendall_tau {\n1430\t m.set(tau);\n1431\t }\n1432\t }\n1433\t\n1434\t pub fn observe_shadow_latency_delta(&self, delta: f64) {\n1435\t if let Some(ref m) = self.shadow_latency_delta_seconds {\n1436\t m.observe(delta);\n1437\t }\n1438\t }\n1439\t\n1440\t pub fn inc_shadow_errors(&self, target: &str, side: &str) {\n1441\t if let Some(ref m) = self.shadow_errors_total {\n1442\t m.with_label_values(&[target, side]).inc();\n1443\t }\n1444\t }\n1445\t\n1446\t // ── §13.17 ILM ──\n1447\t\n1448\t pub fn inc_rollover_events(&self, policy: &str) {\n1449\t if let Some(ref m) = self.rollover_events_total {\n1450\t m.with_label_values(&[policy]).inc();\n1451\t }\n1452\t }\n1453\t\n1454\t pub fn set_rollover_active_indexes(&self, alias: &str, count: f64) {\n1455\t if let Some(ref m) = self.rollover_active_indexes {\n1456\t m.with_label_values(&[alias]).set(count);\n1457\t }\n1458\t }\n1459\t\n1460\t pub fn inc_rollover_documents_expired(&self, policy: &str) {\n1461\t if let Some(ref m) = self.rollover_documents_expired_total {\n1462\t m.with_label_values(&[policy]).inc();\n1463\t }\n1464\t }\n1465\t\n1466\t pub fn set_rollover_last_action_seconds(&self, policy: &str, secs: f64) {\n1467\t if let Some(ref m) = self.rollover_last_action_seconds {\n1468\t m.with_label_values(&[policy]).set(secs);\n1469\t }\n1470\t }\n1471\t\n1472\t // ── §13.18 Canary ──\n1473\t\n1474\t pub fn inc_canary_runs(&self, canary: &str, result: &str) {\n1475\t if let Some(ref m) = self.canary_runs_total {\n1476\t m.with_label_values(&[canary, result]).inc();\n1477\t }\n1478\t }\n1479\t\n1480\t pub fn observe_canary_latency_ms(&self, canary: &str, ms: f64) {\n1481\t if let Some(ref m) = self.canary_latency_ms {\n1482\t m.with_label_values(&[canary]).observe(ms);\n1483\t }\n1484\t }\n1485\t\n1486\t pub fn inc_canary_assertion_failures(&self, canary: &str, assertion_type: &str) {\n1487\t if let Some(ref m) = self.canary_assertion_failures_total {\n1488\t m.with_label_values(&[canary, assertion_type]).inc();\n1489\t }\n1490\t }\n1491\t\n1492\t // ── §13.19 Admin UI ──\n1493\t\n1494\t pub fn inc_admin_ui_sessions(&self) {\n1495\t if let Some(ref m) = self.admin_ui_sessions_total {\n1496\t m.inc();\n1497\t }\n1498\t }\n1499\t\n1500\t pub fn inc_admin_ui_action(&self, action: &str) {\n1501\t if let Some(ref m) = self.admin_ui_action_total {\n1502\t m.with_label_values(&[action]).inc();\n1503\t }\n1504\t }\n1505\t\n1506\t pub fn inc_admin_ui_destructive_action(&self, action: &str) {\n1507\t if let Some(ref m) = self.admin_ui_destructive_action_total {\n1508\t m.with_label_values(&[action]).inc();\n1509\t }\n1510\t }\n1511\t\n1512\t // ── §13.20 Explain ──\n1513\t\n1514\t pub fn inc_explain_requests(&self) {\n1515\t if let Some(ref m) = self.explain_requests_total {\n1516\t m.inc();\n1517\t }\n1518\t }\n1519\t\n1520\t pub fn inc_explain_warnings(&self, warning_type: &str) {\n1521\t if let Some(ref m) = self.explain_warnings_total {\n1522\t m.with_label_values(&[warning_type]).inc();\n1523\t }\n1524\t }\n1525\t\n1526\t pub fn inc_explain_execute(&self) {\n1527\t if let Some(ref m) = self.explain_execute_total {\n1528\t m.inc();\n1529\t }\n1530\t }\n1531\t\n1532\t // ── §13.21 Search UI ──\n1533\t\n1534\t pub fn inc_search_ui_sessions(&self) {\n1535\t if let Some(ref m) = self.search_ui_sessions_total {\n1536\t m.inc();\n1537\t }\n1538\t }\n1539\t\n1540\t pub fn inc_search_ui_queries(&self, index: &str) {\n1541\t if let Some(ref m) = self.search_ui_queries_total {\n1542\t m.with_label_values(&[index]).inc();\n1543\t }\n1544\t }\n1545\t\n1546\t pub fn inc_search_ui_zero_hits(&self, index: &str) {\n1547\t if let Some(ref m) = self.search_ui_zero_hits_total {\n1548\t m.with_label_values(&[index]).inc();\n1549\t }\n1550\t }\n1551\t\n1552\t pub fn inc_search_ui_click_through(&self, index: &str) {\n1553\t if let Some(ref m) = self.search_ui_click_through_total {\n1554\t m.with_label_values(&[index]).inc();\n1555\t }\n1556\t }\n1557\t\n1558\t pub fn set_search_ui_p95_ms(&self, index: &str, ms: f64) {\n1559\t if let Some(ref m) = self.search_ui_p95_ms {\n1560\t m.with_label_values(&[index]).set(ms);\n1561\t }\n1562\t }\n1563\t\n1564\t // ── §14.9 Resource-pressure ──\n1565\t\n1566\t pub fn set_memory_pressure(&self, level: u32) {\n1567\t self.memory_pressure.set(level as f64);\n1568\t }\n1569\t\n1570\t pub fn inc_cpu_throttled_seconds(&self, secs: f64) {\n1571\t self.cpu_throttled_seconds_total.inc_by(secs);\n1572\t }\n1573\t\n1574\t pub fn set_request_queue_depth(&self, depth: u64) {\n1575\t self.request_queue_depth.set(depth as f64);\n1576\t }\n1577\t\n1578\t pub fn set_background_queue_depth(&self, job_type: &str, depth: u64) {\n1579\t self.background_queue_depth.with_label_values(&[job_type]).set(depth as f64);\n1580\t }\n1581\t\n1582\t pub fn set_peer_pod_count(&self, count: u64) {\n1583\t self.peer_pod_count.set(count as f64);\n1584\t }\n1585\t\n1586\t pub fn set_leader(&self, is_leader: bool) {\n1587\t self.leader.set(if is_leader { 1.0 } else { 0.0 });\n1588\t }\n1589\t\n1590\t pub fn set_owned_shards_count(&self, count: u64) {\n1591\t self.owned_shards_count.set(count as f64);\n1592\t }\n1593\t\n1594\t // ── §13.5 Two-phase settings broadcast metrics ──\n1595\t\n1596\t pub fn set_settings_broadcast_phase(&self, index: &str, phase: u8) {\n1597\t self.settings_broadcast_phase.with_label_values(&[index]).set(phase as f64);\n1598\t }\n1599\t\n1600\t pub fn clear_settings_broadcast_phase(&self, index: &str) {\n1601\t self.settings_broadcast_phase.with_label_values(&[index]).set(0.0);\n1602\t }\n1603\t\n1604\t pub fn inc_settings_hash_mismatch(&self) {\n1605\t self.settings_hash_mismatch_total.inc();\n1606\t }\n1607\t\n1608\t pub fn inc_settings_drift_repair(&self, index: &str) {\n1609\t self.settings_drift_repair_total.with_label_values(&[index]).inc();\n1610\t }\n1611\t\n1612\t pub fn set_settings_version(&self, index: &str, version: u64) {\n1613\t self.settings_version.with_label_values(&[index]).set(version as f64);\n1614\t }\n1615\t\n1616\t pub fn get_settings_version(&self, index: &str) -> f64 {\n1617\t self.settings_version.with_label_values(&[index]).get()\n1618\t }\n1619\t\n1620\t // ── §13.7 Alias metrics ──\n1621\t\n1622\t pub fn inc_alias_resolution(&self, alias: &str) {\n1623\t self.alias_resolutions_total.with_label_values(&[alias]).inc();\n1624\t }\n1625\t\n1626\t pub fn inc_alias_flip(&self, alias: &str) {\n1627\t self.alias_flips_total.with_label_values(&[alias]).inc();\n1628\t }\n1629\t\n1630\t // ── §13.6 Session pinning metrics ──\n1631\t\n1632\t pub fn set_session_active_count(&self, count: u64) {\n1633\t self.session_active_count.set(count as f64);\n1634\t }\n1635\t\n1636\t pub fn inc_session_pin_enforced(&self, strategy: &str) {\n1637\t self.session_pin_enforced_total.with_label_values(&[strategy]).inc();\n1638\t }\n1639\t\n1640\t pub fn observe_session_wait_duration(&self, duration_seconds: f64) {\n1641\t self.session_wait_duration_seconds.observe(duration_seconds);\n1642\t }\n1643\t\n1644\t pub fn inc_session_wait_timeout(&self, strategy: &str) {\n1645\t self.session_wait_timeout_total.with_label_values(&[strategy]).inc();\n1646\t }\n1647\t\n1648\t pub fn registry(&self) -> &Registry {\n1649\t &self.registry\n1650\t }\n1651\t}\n1652\t\n1653\t#[cfg(test)]\n1654\tmod tests {\n1655\t use super::*;\n1656\t\n1657\t #[test]\n1658\t fn test_request_id_generation() {\n1659\t // Generate multiple IDs to verify format\n1660\t for _ in 0..10 {\n1661\t let id = generate_request_id();\n1662\t\n1663\t // IDs should be 16 hex chars (64-bit hash)\n1664\t assert_eq!(id.len(), 16);\n1665\t\n1666\t // IDs should be hexadecimal\n1667\t assert!(id.chars().all(|c| c.is_ascii_hexdigit()));\n1668\t }\n1669\t\n1670\t // Test that different UUID prefixes produce different IDs\n1671\t let id1 = generate_request_id();\n1672\t std::thread::sleep(std::time::Duration::from_millis(5));\n1673\t let id2 = generate_request_id();\n1674\t // In production, time ensures uniqueness; test just verifies format above\n1675\t assert_eq!(id1.len(), 16);\n1676\t assert_eq!(id2.len(), 16);\n1677\t }\n1678\t\n1679\t #[test]\n1680\t fn test_metrics_creation() {\n1681\t // Default config has all §13 features enabled\n1682\t let metrics = Metrics::new(&MiroirConfig::default());\n1683\t\n1684\t // Add some sample data to ensure metrics show up in output\n1685\t metrics.request_duration.with_label_values(&[\"GET\", \"/test\", \"200\"]).observe(0.1);\n1686\t metrics.requests_total.with_label_values(&[\"GET\", \"/test\", \"200\"]).inc();\n1687\t metrics.requests_in_flight.inc();\n1688\t metrics.node_healthy.with_label_values(&[\"test-node\"]).set(1.0);\n1689\t metrics.node_request_duration.with_label_values(&[\"test-node\", \"search\"]).observe(0.05);\n1690\t metrics.node_errors.with_label_values(&[\"test-node\", \"timeout\"]).inc();\n1691\t metrics.shard_coverage.set(1.0);\n1692\t metrics.degraded_shards.set(0.0);\n1693\t metrics.shard_distribution.with_label_values(&[\"test-node\"]).set(32.0);\n1694\t metrics.task_processing_age.observe(0.1);\n1695\t metrics.tasks_total.with_label_values(&[\"completed\"]).inc();\n1696\t metrics.task_registry_size.set(5.0);\n1697\t metrics.scatter_fan_out_size.observe(3.0);\n1698\t metrics.scatter_partial_responses.inc();\n1699\t metrics.scatter_retries.inc();\n1700\t metrics.rebalance_in_progress.set(0.0);\n1701\t metrics.rebalance_documents_migrated.inc();\n1702\t metrics.rebalance_duration.observe(10.0);\n1703\t\n1704\t // Write to advanced Vec metrics so they appear in output\n1705\t metrics.inc_multisearch_tenant_session_pin_override(\"t1\");\n1706\t metrics.inc_vector_merge_strategy(\"convex\");\n1707\t metrics.inc_cdc_events_published(\"webhook\", \"idx1\");\n1708\t metrics.set_cdc_lag_seconds(\"webhook\", 0.5);\n1709\t metrics.set_cdc_buffer_bytes(\"webhook\", 1024.0);\n1710\t metrics.inc_cdc_dropped(\"webhook\");\n1711\t metrics.inc_cdc_events_suppressed(\"origin1\");\n1712\t metrics.inc_ttl_documents_expired(\"idx1\");\n1713\t metrics.observe_ttl_sweep_duration(\"idx1\", 0.1);\n1714\t metrics.set_ttl_pending_estimate(\"idx1\", 50.0);\n1715\t metrics.inc_tenant_queries(\"t1\", \"g1\");\n1716\t metrics.set_tenant_pinned_groups(\"t1\", 1);\n1717\t metrics.inc_tenant_fallback(\"no_group\");\n1718\t metrics.inc_shadow_diff(\"rank\");\n1719\t metrics.inc_shadow_errors(\"target1\", \"primary\");\n1720\t metrics.inc_rollover_events(\"policy1\");\n1721\t metrics.set_rollover_active_indexes(\"alias1\", 1.0);\n1722\t metrics.inc_rollover_documents_expired(\"policy1\");\n1723\t metrics.set_rollover_last_action_seconds(\"policy1\", 60.0);\n1724\t metrics.inc_canary_runs(\"canary1\", \"pass\");\n1725\t metrics.observe_canary_latency_ms(\"canary1\", 50.0);\n1726\t metrics.inc_canary_assertion_failures(\"canary1\", \"latency\");\n1727\t metrics.inc_admin_ui_action(\"login\");\n1728\t metrics.inc_admin_ui_destructive_action(\"delete_index\");\n1729\t metrics.inc_explain_warnings(\"slow_plan\");\n1730\t metrics.inc_search_ui_queries(\"idx1\");\n1731\t metrics.inc_search_ui_zero_hits(\"idx1\");\n1732\t metrics.inc_search_ui_click_through(\"idx1\");\n1733\t metrics.set_search_ui_p95_ms(\"idx1\", 150.0);\n1734\t\n1735\t // §14.9 Resource-pressure metrics\n1736\t metrics.set_memory_pressure(0);\n1737\t metrics.inc_cpu_throttled_seconds(1.5);\n1738\t metrics.set_request_queue_depth(42);\n1739\t metrics.set_background_queue_depth(\"rebalance\", 5);\n1740\t metrics.set_background_queue_depth(\"replication\", 3);\n1741\t metrics.set_peer_pod_count(3);\n1742\t metrics.set_leader(true);\n1743\t metrics.set_owned_shards_count(12);\n1744\t\n1745\t let encoded = metrics.encode_metrics();\n1746\t assert!(encoded.is_ok());\n1747\t\n1748\t let output = encoded.unwrap();\n1749\t\n1750\t // Verify all 18 core plan §10 metric names appear in the output\n1751\t let expected_metrics = [\n1752\t // Request metrics\n1753\t \"miroir_request_duration_seconds\",\n1754\t \"miroir_requests_total\",\n1755\t \"miroir_requests_in_flight\",\n1756\t // Node health metrics\n1757\t \"miroir_node_healthy\",\n1758\t \"miroir_node_request_duration_seconds\",\n1759\t \"miroir_node_errors_total\",\n1760\t // Shard metrics\n1761\t \"miroir_shard_coverage\",\n1762\t \"miroir_degraded_shards_total\",\n1763\t \"miroir_shard_distribution\",\n1764\t // Task metrics\n1765\t \"miroir_task_processing_age_seconds\",\n1766\t \"miroir_tasks_total\",\n1767\t \"miroir_task_registry_size\",\n1768\t // Scatter-gather metrics\n1769\t \"miroir_scatter_fan_out_size\",\n1770\t \"miroir_scatter_partial_responses_total\",\n1771\t \"miroir_scatter_retries_total\",\n1772\t // Rebalancer metrics\n1773\t \"miroir_rebalance_in_progress\",\n1774\t \"miroir_rebalance_documents_migrated_total\",\n1775\t \"miroir_rebalance_duration_seconds\",\n1776\t ];\n1777\t for name in &expected_metrics {\n1778\t assert!(output.contains(name), \"missing metric: {}\", name);\n1779\t }\n1780\t\n1781\t // With defaults (all §13 enabled), advanced metrics should be present\n1782\t let advanced_metrics = [\n1783\t // §13.11 Multi-search\n1784\t \"miroir_multisearch_queries_per_batch\",\n1785\t \"miroir_multisearch_batches_total\",\n1786\t \"miroir_multisearch_partial_failures_total\",\n1787\t \"miroir_tenant_session_pin_override_total\",\n1788\t // §13.12 Vector\n1789\t \"miroir_vector_search_over_fetched_total\",\n1790\t \"miroir_vector_merge_strategy\",\n1791\t \"miroir_vector_embedder_drift_total\",\n1792\t // §13.13 CDC\n1793\t \"miroir_cdc_events_published_total\",\n1794\t \"miroir_cdc_lag_seconds\",\n1795\t \"miroir_cdc_buffer_bytes\",\n1796\t \"miroir_cdc_dropped_total\",\n1797\t \"miroir_cdc_events_suppressed_total\",\n1798\t // §13.14 TTL\n1799\t \"miroir_ttl_documents_expired_total\",\n1800\t \"miroir_ttl_sweep_duration_seconds\",\n1801\t \"miroir_ttl_pending_estimate\",\n1802\t // §13.15 Tenant\n1803\t \"miroir_tenant_queries_total\",\n1804\t \"miroir_tenant_pinned_groups\",\n1805\t \"miroir_tenant_fallback_total\",\n1806\t // §13.16 Shadow\n1807\t \"miroir_shadow_diff_total\",\n1808\t \"miroir_shadow_kendall_tau\",\n1809\t \"miroir_shadow_latency_delta_seconds\",\n1810\t \"miroir_shadow_errors_total\",\n1811\t // §13.17 ILM\n1812\t \"miroir_rollover_events_total\",\n1813\t \"miroir_rollover_active_indexes\",\n1814\t \"miroir_rollover_documents_expired_total\",\n1815\t \"miroir_rollover_last_action_seconds\",\n1816\t // §13.18 Canary\n1817\t \"miroir_canary_runs_total\",\n1818\t \"miroir_canary_latency_ms\",\n1819\t \"miroir_canary_assertion_failures_total\",\n1820\t // §13.19 Admin UI\n1821\t \"miroir_admin_ui_sessions_total\",\n1822\t \"miroir_admin_ui_action_total\",\n1823\t \"miroir_admin_ui_destructive_action_total\",\n1824\t // §13.20 Explain\n1825\t \"miroir_explain_requests_total\",\n1826\t \"miroir_explain_warnings_total\",\n1827\t \"miroir_explain_execute_total\",\n1828\t // §13.21 Search UI\n1829\t \"miroir_search_ui_sessions_total\",\n1830\t \"miroir_search_ui_queries_total\",\n1831\t \"miroir_search_ui_zero_hits_total\",\n1832\t \"miroir_search_ui_click_through_total\",\n1833\t \"miroir_search_ui_p95_ms\",\n1834\t ];\n1835\t for name in &advanced_metrics {\n1836\t assert!(output.contains(name), \"missing advanced metric: {}\", name);\n1837\t }\n1838\t }\n1839\t\n1840\t #[test]\n1841\t fn test_metrics_feature_flags_off() {\n1842\t // Build a config with all §13.11-13.21 features disabled\n1843\t let mut config = MiroirConfig::default();\n1844\t config.multi_search.enabled = false;\n1845\t config.vector_search.enabled = false;\n1846\t config.cdc.enabled = false;\n1847\t config.ttl.enabled = false;\n1848\t config.tenant_affinity.enabled = false;\n1849\t config.shadow.enabled = false;\n1850\t config.ilm.enabled = false;\n1851\t config.canary_runner.enabled = false;\n1852\t config.admin_ui.enabled = false;\n1853\t config.explain.enabled = false;\n1854\t config.search_ui.enabled = false;\n1855\t\n1856\t let metrics = Metrics::new(&config);\n1857\t\n1858\t // Write to core Vec metrics so they appear in output\n1859\t metrics.request_duration.with_label_values(&[\"GET\", \"/test\", \"200\"]).observe(0.1);\n1860\t\n1861\t let encoded = metrics.encode_metrics().unwrap();\n1862\t\n1863\t // Core metrics should still be present\n1864\t assert!(encoded.contains(\"miroir_request_duration_seconds\"));\n1865\t assert!(encoded.contains(\"miroir_rebalance_duration_seconds\"));\n1866\t\n1867\t // Advanced metrics should NOT appear\n1868\t let advanced_names = [\n1869\t \"miroir_multisearch_queries_per_batch\",\n1870\t \"miroir_vector_search_over_fetched_total\",\n1871\t \"miroir_cdc_events_published_total\",\n1872\t \"miroir_ttl_documents_expired_total\",\n1873\t \"miroir_tenant_queries_total\",\n1874\t \"miroir_shadow_diff_total\",\n1875\t \"miroir_rollover_events_total\",\n1876\t \"miroir_canary_runs_total\",\n1877\t \"miroir_admin_ui_sessions_total\",\n1878\t \"miroir_explain_requests_total\",\n1879\t \"miroir_search_ui_sessions_total\",\n1880\t ];\n1881\t for name in &advanced_names {\n1882\t assert!(!encoded.contains(name), \"advanced metric should not appear when disabled: {}\", name);\n1883\t }\n1884\t }\n1885\t\n1886\t #[test]\n1887\t fn test_feature_gated_accessors_noop_when_disabled() {\n1888\t let mut config = MiroirConfig::default();\n1889\t config.multi_search.enabled = false;\n1890\t config.vector_search.enabled = false;\n1891\t config.cdc.enabled = false;\n1892\t config.ttl.enabled = false;\n1893\t config.tenant_affinity.enabled = false;\n1894\t config.shadow.enabled = false;\n1895\t config.ilm.enabled = false;\n1896\t config.canary_runner.enabled = false;\n1897\t config.admin_ui.enabled = false;\n1898\t config.explain.enabled = false;\n1899\t config.search_ui.enabled = false;\n1900\t\n1901\t let metrics = Metrics::new(&config);\n1902\t\n1903\t // All accessor methods should be safe to call (no-op)\n1904\t metrics.observe_multisearch_queries_per_batch(5);\n1905\t metrics.inc_multisearch_batches_total();\n1906\t metrics.inc_multisearch_partial_failures();\n1907\t metrics.inc_multisearch_tenant_session_pin_override(\"t1\");\n1908\t metrics.inc_vector_search_over_fetched();\n1909\t metrics.inc_vector_merge_strategy(\"convex\");\n1910\t metrics.inc_vector_embedder_drift();\n1911\t metrics.inc_cdc_events_published(\"webhook\", \"idx\");\n1912\t metrics.set_cdc_lag_seconds(\"webhook\", 1.5);\n1913\t metrics.set_cdc_buffer_bytes(\"webhook\", 1024.0);\n1914\t metrics.inc_cdc_dropped(\"webhook\");\n1915\t metrics.inc_cdc_events_suppressed(\"origin1\");\n1916\t metrics.inc_ttl_documents_expired(\"idx\");\n1917\t metrics.observe_ttl_sweep_duration(\"idx\", 0.1);\n1918\t metrics.set_ttl_pending_estimate(\"idx\", 50.0);\n1919\t metrics.inc_tenant_queries(\"t1\", \"0\");\n1920\t metrics.set_tenant_pinned_groups(\"t1\", 1);\n1921\t metrics.inc_tenant_fallback(\"no_group\");\n1922\t metrics.inc_shadow_diff(\"rank\");\n1923\t metrics.set_shadow_kendall_tau(0.95);\n1924\t metrics.observe_shadow_latency_delta(0.01);\n1925\t metrics.inc_shadow_errors(\"target1\", \"primary\");\n1926\t metrics.inc_rollover_events(\"policy1\");\n1927\t metrics.set_rollover_active_indexes(\"alias1\", 1.0);\n1928\t metrics.inc_rollover_documents_expired(\"policy1\");\n1929\t metrics.set_rollover_last_action_seconds(\"policy1\", 60.0);\n1930\t metrics.inc_canary_runs(\"canary1\", \"pass\");\n1931\t metrics.observe_canary_latency_ms(\"canary1\", 50.0);\n1932\t metrics.inc_canary_assertion_failures(\"canary1\", \"latency\");\n1933\t metrics.inc_admin_ui_sessions();\n1934\t metrics.inc_admin_ui_action(\"login\");\n1935\t metrics.inc_admin_ui_destructive_action(\"delete_index\");\n1936\t metrics.inc_explain_requests();\n1937\t metrics.inc_explain_warnings(\"slow_plan\");\n1938\t metrics.inc_explain_execute();\n1939\t metrics.inc_search_ui_sessions();\n1940\t metrics.inc_search_ui_queries(\"idx\");\n1941\t metrics.inc_search_ui_zero_hits(\"idx\");\n1942\t metrics.inc_search_ui_click_through(\"idx\");\n1943\t metrics.set_search_ui_p95_ms(\"idx\", 150.0);\n1944\t }\n1945\t\n1946\t #[test]\n1947\t fn test_header_request_id() {\n1948\t let mut headers = HeaderMap::new();\n1949\t assert!(headers.get_request_id().is_none());\n1950\t\n1951\t headers.set_request_id(\"test-id-123\");\n1952\t assert_eq!(headers.get_request_id(), Some(\"test-id-123\".to_string()));\n1953\t }\n1954\t\n1955\t // ---------------------------------------------------------------------------\n1956\t // RequestId type tests\n1957\t // ---------------------------------------------------------------------------\n1958\t\n1959\t #[test]\n1960\t fn test_request_id_format() {\n1961\t let id = RequestId::new();\n1962\t // RequestId should be exactly 8 hex characters\n1963\t assert_eq!(id.as_str().len(), 8);\n1964\t assert!(id.as_str().chars().all(|c| c.is_ascii_hexdigit()));\n1965\t }\n1966\t\n1967\t #[test]\n1968\t fn test_request_id_parse_valid() {\n1969\t // Valid 8-char hex string\n1970\t let valid = \"abcd1234\";\n1971\t let parsed = RequestId::parse(valid.to_string());\n1972\t assert!(parsed.is_some());\n1973\t assert_eq!(parsed.unwrap().as_str(), valid);\n1974\t }\n1975\t\n1976\t #[test]\n1977\t fn test_request_id_parse_invalid_wrong_length() {\n1978\t // Wrong length (too short)\n1979\t assert!(RequestId::parse(\"abc123\".to_string()).is_none());\n1980\t // Wrong length (too long)\n1981\t assert!(RequestId::parse(\"abcd12345678\".to_string()).is_none());\n1982\t }\n1983\t\n1984\t #[test]\n1985\t fn test_request_id_parse_invalid_non_hex() {\n1986\t // Contains non-hex characters\n1987\t assert!(RequestId::parse(\"abcd1234!\".to_string()).is_none());\n1988\t assert!(RequestId::parse(\"ghijklmn\".to_string()).is_none());\n1989\t }\n1990\t\n1991\t #[test]\n1992\t fn test_request_id_uniqueness() {\n1993\t // Generate two consecutive IDs - they should be different\n1994\t // due to UUIDv7's timestamp component\n1995\t let id1 = RequestId::new();\n1996\t std::thread::sleep(std::time::Duration::from_millis(5));\n1997\t let id2 = RequestId::new();\n1998\t\n1999\t assert_ne!(id1, id2);\n2000\t assert_ne!(id1.as_str(), id2.as_str());\n2001\t }\n2002\t\n2003\t // ---------------------------------------------------------------------------\n2004\t // Integration tests for request_id_middleware\n2005\t // ---------------------------------------------------------------------------\n2006\t\n2007\t #[tokio::test]\n2008\t async fn test_request_id_middleware_adds_header() {\n2009\t use axum::{routing::get, Router};\n2010\t use http_body_util::Full;\n2011\t use tower::ServiceExt;\n2012\t\n2013\t // Build a simple router with the request ID middleware\n2014\t let app = Router::new()\n2015\t .route(\"/test\", get(|| async { \"OK\" }))\n2016\t .layer(axum::middleware::from_fn(request_id_middleware));\n2017\t\n2018\t // Create a test request\n2019\t let request = Request::builder()\n2020\t .uri(\"/test\")\n2021\t .body(Full::default())\n2022\t .unwrap();\n2023\t\n2024\t // Send the request\n2025\t let response = app.oneshot(request).await.unwrap();\n2026\t\n2027\t // Verify X-Request-Id header is present\n2028\t let header = response\n2029\t .headers()\n2030\t .get(\"x-request-id\")\n2031\t .expect(\"X-Request-Id header should be present\");\n2032\t let header_value = header.to_str().unwrap();\n2033\t\n2034\t // Verify it's 8 hex characters\n2035\t assert_eq!(\n2036\t header_value.len(),\n2037\t 8,\n2038\t \"X-Request-Id should be 8 characters\"\n2039\t );\n2040\t assert!(\n2041\t header_value.chars().all(|c| c.is_ascii_hexdigit()),\n2042\t \"X-Request-Id should be hexadecimal\"\n2043\t );\n2044\t }\n2045\t\n2046\t #[tokio::test]\n2047\t async fn test_request_id_middleware_unique_per_request() {\n2048\t use axum::{routing::get, Router};\n2049\t use http_body_util::Full;\n2050\t use tower::ServiceExt;\n2051\t\n2052\t // Build a simple router with the request ID middleware\n2053\t let app = Router::new()\n2054\t .route(\"/test\", get(|| async { \"OK\" }))\n2055\t .layer(axum::middleware::from_fn(request_id_middleware));\n2056\t\n2057\t // Create two identical requests\n2058\t let request1 = Request::builder()\n2059\t .uri(\"/test\")\n2060\t .body(Full::default())\n2061\t .unwrap();\n2062\t\n2063\t let request2 = Request::builder()\n2064\t .uri(\"/test\")\n2065\t .body(Full::default())\n2066\t .unwrap();\n2067\t\n2068\t // Send both requests\n2069\t let response1 = app.clone().oneshot(request1).await.unwrap();\n2070\t let response2 = app.oneshot(request2).await.unwrap();\n2071\t\n2072\t // Extract headers\n2073\t let id1 = response1\n2074\t .headers()\n2075\t .get(\"x-request-id\")\n2076\t .unwrap()\n2077\t .to_str()\n2078\t .unwrap();\n2079\t let id2 = response2\n2080\t .headers()\n2081\t .get(\"x-request-id\")\n2082\t .unwrap()\n2083\t .to_str()\n2084\t .unwrap();\n2085\t\n2086\t // Verify IDs are different (UUIDv7 timestamp ensures this)\n2087\t assert_ne!(\n2088\t id1, id2,\n2089\t \"Two consecutive requests should have different request IDs\"\n2090\t );\n2091\t\n2092\t // Both should still be valid 8-char hex\n2093\t assert_eq!(id1.len(), 8);\n2094\t assert_eq!(id2.len(), 8);\n2095\t }\n2096\t\n2097\t #[tokio::test]\n2098\t async fn test_request_id_middleware_preserves_existing_header() {\n2099\t use axum::{routing::get, Router};\n2100\t use http_body_util::Full;\n2101\t use tower::ServiceExt;\n2102\t\n2103\t // Build a simple router with the request ID middleware\n2104\t let app = Router::new()\n2105\t .route(\"/test\", get(|| async { \"OK\" }))\n2106\t .layer(axum::middleware::from_fn(request_id_middleware));\n2107\t\n2108\t // Create a request with a pre-existing X-Request-Id header\n2109\t let existing_id = \"deadbeef\";\n2110\t let request = Request::builder()\n2111\t .uri(\"/test\")\n2112\t .header(\"x-request-id\", existing_id)\n2113\t .body(Full::default())\n2114\t .unwrap();\n2115\t\n2116\t // Send the request\n2117\t let response = app.oneshot(request).await.unwrap();\n2118\t\n2119\t // Verify the header is preserved\n2120\t let header = response\n2121\t .headers()\n2122\t .get(\"x-request-id\")\n2123\t .expect(\"X-Request-Id header should be present\");\n2124\t let header_value = header.to_str().unwrap();\n2125\t\n2126\t assert_eq!(\n2127\t header_value, existing_id,\n2128\t \"Existing X-Request-Id should be preserved\"\n2129\t );\n2130\t }\n2131\t}\n2132\t"}]},"parent_tool_use_id":null,"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","uuid":"112565c0-b733-45de-ada5-13ad4223778d","timestamp":"2026-05-23T06:49:28.876Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/crates/miroir-proxy/src/middleware.rs","content":"//! Structured logging, request IDs, and Prometheus metrics middleware.\n\nuse std::time::Instant;\n\nuse axum::{\n extract::{Request, State},\n http::{HeaderMap, HeaderValue},\n middleware::Next,\n response::Response,\n Router,\n routing::get,\n};\nuse miroir_core::config::MiroirConfig;\nuse prometheus::{\n Counter, CounterVec, Encoder, Gauge, GaugeVec, Histogram, HistogramOpts, HistogramVec, Opts,\n Registry, TextEncoder,\n};\nuse tracing::info_span;\nuse uuid::Uuid;\nuse hex;\nuse std::collections::hash_map::DefaultHasher;\nuse std::hash::{Hash, Hasher};\n\n/// Request ID wrapper type for storing in axum Request extensions.\n///\n/// This is a newtype wrapper around the 8-character hex request ID,\n/// allowing handlers to extract it via `Request.extensions().get::()`.\n#[derive(Clone, Debug, PartialEq, Eq, Hash)]\npub struct RequestId(pub String);\n\nimpl RequestId {\n /// Create a new RequestId from a UUIDv7.\n ///\n /// Hashes the full UUIDv7 to produce an 8-character hex ID that is unique\n /// even for consecutive calls within the same millisecond.\n pub fn new() -> Self {\n let uuid = Uuid::now_v7();\n let bytes = uuid.as_bytes();\n // Hash the full UUID to ensure uniqueness even within the same millisecond\n let mut hasher = DefaultHasher::new();\n hasher.write(bytes);\n let hash = hasher.finish();\n // Take first 8 hex chars of 64-bit hash (32 bits is sufficient entropy)\n Self(format!(\"{:08x}\", hash as u32))\n }\n\n /// Get the inner request ID string.\n pub fn as_str(&self) -> &str {\n &self.0\n }\n\n /// Parse a RequestId from a string.\n pub fn parse(s: String) -> Option {\n if s.len() == 8 && s.chars().all(|c| c.is_ascii_hexdigit()) {\n Some(Self(s))\n } else {\n None\n }\n }\n}\n\n/// Session ID wrapper type for read-your-writes session pinning (plan §13.6).\n///\n/// Extracted from the `X-Miroir-Session` header and stored in request extensions.\n/// Handlers can access it via `Request.extensions().get::()`.\n#[derive(Clone, Debug, PartialEq, Eq, Hash)]\npub struct SessionId(pub String);\n\nimpl Default for SessionId {\n fn default() -> Self {\n Self(String::new())\n }\n}\n\nimpl SessionId {\n /// Get the inner session ID string.\n pub fn as_str(&self) -> &str {\n &self.0\n }\n\n /// Parse a SessionId from a string.\n ///\n /// Accepts any non-empty string (client-provided UUID or identifier).\n pub fn parse(s: String) -> Option {\n if !s.is_empty() && s.len() <= 256 {\n Some(Self(s))\n } else {\n None\n }\n }\n}\n\npub async fn request_id_middleware(\n mut req: Request,\n next: Next,\n) -> Response {\n // Check for existing request ID in headers\n let request_id = req\n .headers()\n .get(\"x-request-id\")\n .and_then(|v| v.to_str().ok())\n .and_then(|s| RequestId::parse(s.to_string()))\n .unwrap_or_else(RequestId::new);\n\n // Store in request extensions for handler access\n req.extensions_mut().insert(request_id.clone());\n\n // Set X-Request-Id header on request (for telemetry_middleware to read)\n if let Ok(val) = HeaderValue::from_str(request_id.as_str()) {\n req.headers_mut().insert(\"x-request-id\", val);\n }\n\n // Process the request\n let mut response = next.run(req).await;\n\n // Add X-Request-Id header to response (override if exists)\n if let Ok(val) = HeaderValue::from_str(request_id.as_str()) {\n response.headers_mut().insert(\"x-request-id\", val);\n }\n\n response\n}\n\n/// Session pinning middleware (plan §13.6).\n///\n/// Extracts the `X-Miroir-Session` header and stores it in request extensions\n/// for handlers to access via `Request.extensions().get::()`.\npub async fn session_pinning_middleware(\n mut req: Request,\n next: Next,\n) -> Response {\n // Extract session ID from header if present\n let session_id = req\n .headers()\n .get(\"x-miroir-session\")\n .and_then(|v| v.to_str().ok())\n .and_then(|s| SessionId::parse(s.to_string()));\n\n // Store in request extensions for handler access\n if let Some(sid) = session_id {\n req.extensions_mut().insert(sid);\n }\n\n next.run(req).await\n}\n\n\n/// Telemetry state combining metrics and pod_id for middleware.\n#[derive(Clone)]\npub struct TelemetryState {\n pub metrics: Metrics,\n pub pod_id: String,\n}\n\nimpl TelemetryState {\n pub fn new(metrics: Metrics) -> Self {\n let pod_id = std::env::var(\"POD_NAME\").unwrap_or_else(|_| \"unknown\".to_string());\n Self { metrics, pod_id }\n }\n}\n\n/// Global metrics registry shared across all middleware instances.\npub struct Metrics {\n registry: Registry,\n\n // ── Request metrics ──\n request_duration: HistogramVec,\n requests_total: CounterVec,\n requests_in_flight: Gauge,\n\n // ── Node health metrics ──\n node_healthy: GaugeVec,\n node_request_duration: HistogramVec,\n node_errors: CounterVec,\n\n // ── Shard metrics ──\n shard_coverage: Gauge,\n degraded_shards: Gauge,\n shard_distribution: GaugeVec,\n\n // ── Task metrics ──\n task_processing_age: Histogram,\n tasks_total: CounterVec,\n task_registry_size: Gauge,\n\n // ── Scatter-gather metrics ──\n scatter_fan_out_size: Histogram,\n scatter_partial_responses: Counter,\n scatter_retries: Counter,\n\n // ── Rebalancer metrics ──\n rebalance_in_progress: Gauge,\n rebalance_documents_migrated: Counter,\n rebalance_duration: Histogram,\n\n // ── §13.11 Multi-search metrics (feature-gated) ──\n multisearch_queries_per_batch: Option,\n multisearch_batches_total: Option,\n multisearch_partial_failures_total: Option,\n multisearch_tenant_session_pin_override_total: Option,\n\n // ── §13.12 Vector search metrics (feature-gated) ──\n vector_search_over_fetched_total: Option,\n vector_merge_strategy: Option,\n vector_embedder_drift_total: Option,\n\n // ── §13.13 CDC metrics (feature-gated) ──\n cdc_events_published_total: Option,\n cdc_lag_seconds: Option,\n cdc_buffer_bytes: Option,\n cdc_dropped_total: Option,\n cdc_events_suppressed_total: Option,\n\n // ── §13.14 TTL metrics (feature-gated) ──\n ttl_documents_expired_total: Option,\n ttl_sweep_duration_seconds: Option,\n ttl_pending_estimate: Option,\n\n // ── §13.15 Tenant affinity metrics (feature-gated) ──\n tenant_queries_total: Option,\n tenant_pinned_groups: Option,\n tenant_fallback_total: Option,\n\n // ── §13.16 Shadow traffic metrics (feature-gated) ──\n shadow_diff_total: Option,\n shadow_kendall_tau: Option,\n shadow_latency_delta_seconds: Option,\n shadow_errors_total: Option,\n\n // ── §13.17 ILM metrics (feature-gated) ──\n rollover_events_total: Option,\n rollover_active_indexes: Option,\n rollover_documents_expired_total: Option,\n rollover_last_action_seconds: Option,\n\n // ── §13.18 Canary metrics (feature-gated) ──\n canary_runs_total: Option,\n canary_latency_ms: Option,\n canary_assertion_failures_total: Option,\n\n // ── §13.19 Admin UI metrics (feature-gated) ──\n admin_ui_sessions_total: Option,\n admin_ui_action_total: Option,\n admin_ui_destructive_action_total: Option,\n\n // ── §13.20 Explain metrics (feature-gated) ──\n explain_requests_total: Option,\n explain_warnings_total: Option,\n explain_execute_total: Option,\n\n // ── §13.21 Search UI metrics (feature-gated) ──\n search_ui_sessions_total: Option,\n search_ui_queries_total: Option,\n search_ui_zero_hits_total: Option,\n search_ui_click_through_total: Option,\n search_ui_p95_ms: Option,\n\n // ── §14.9 Resource-pressure metrics (always present) ──\n memory_pressure: Gauge,\n cpu_throttled_seconds_total: Counter,\n request_queue_depth: Gauge,\n background_queue_depth: GaugeVec,\n peer_pod_count: Gauge,\n leader: Gauge,\n owned_shards_count: Gauge,\n\n // ── Admin session sealing metrics (always present) ──\n admin_session_key_generated: Gauge,\n admin_session_revoked_total: Counter,\n\n // ── §13.5 Two-phase settings broadcast metrics (always present) ──\n settings_broadcast_phase: GaugeVec,\n settings_hash_mismatch_total: Counter,\n settings_drift_repair_total: CounterVec,\n settings_version: GaugeVec,\n\n // ── §13.7 Alias metrics (always present) ──\n alias_resolutions_total: CounterVec,\n alias_flips_total: CounterVec,\n\n // ── §13.6 Session pinning metrics (always present) ──\n session_active_count: Gauge,\n session_pin_enforced_total: CounterVec,\n session_wait_duration_seconds: Histogram,\n session_wait_timeout_total: CounterVec,\n}\n\nimpl Clone for Metrics {\n fn clone(&self) -> Self {\n Self {\n registry: self.registry.clone(),\n request_duration: self.request_duration.clone(),\n requests_total: self.requests_total.clone(),\n requests_in_flight: self.requests_in_flight.clone(),\n node_healthy: self.node_healthy.clone(),\n node_request_duration: self.node_request_duration.clone(),\n node_errors: self.node_errors.clone(),\n shard_coverage: self.shard_coverage.clone(),\n degraded_shards: self.degraded_shards.clone(),\n shard_distribution: self.shard_distribution.clone(),\n task_processing_age: self.task_processing_age.clone(),\n tasks_total: self.tasks_total.clone(),\n task_registry_size: self.task_registry_size.clone(),\n scatter_fan_out_size: self.scatter_fan_out_size.clone(),\n scatter_partial_responses: self.scatter_partial_responses.clone(),\n scatter_retries: self.scatter_retries.clone(),\n rebalance_in_progress: self.rebalance_in_progress.clone(),\n rebalance_documents_migrated: self.rebalance_documents_migrated.clone(),\n rebalance_duration: self.rebalance_duration.clone(),\n multisearch_queries_per_batch: self.multisearch_queries_per_batch.clone(),\n multisearch_batches_total: self.multisearch_batches_total.clone(),\n multisearch_partial_failures_total: self.multisearch_partial_failures_total.clone(),\n multisearch_tenant_session_pin_override_total: self.multisearch_tenant_session_pin_override_total.clone(),\n vector_search_over_fetched_total: self.vector_search_over_fetched_total.clone(),\n vector_merge_strategy: self.vector_merge_strategy.clone(),\n vector_embedder_drift_total: self.vector_embedder_drift_total.clone(),\n cdc_events_published_total: self.cdc_events_published_total.clone(),\n cdc_lag_seconds: self.cdc_lag_seconds.clone(),\n cdc_buffer_bytes: self.cdc_buffer_bytes.clone(),\n cdc_dropped_total: self.cdc_dropped_total.clone(),\n cdc_events_suppressed_total: self.cdc_events_suppressed_total.clone(),\n ttl_documents_expired_total: self.ttl_documents_expired_total.clone(),\n ttl_sweep_duration_seconds: self.ttl_sweep_duration_seconds.clone(),\n ttl_pending_estimate: self.ttl_pending_estimate.clone(),\n tenant_queries_total: self.tenant_queries_total.clone(),\n tenant_pinned_groups: self.tenant_pinned_groups.clone(),\n tenant_fallback_total: self.tenant_fallback_total.clone(),\n shadow_diff_total: self.shadow_diff_total.clone(),\n shadow_kendall_tau: self.shadow_kendall_tau.clone(),\n shadow_latency_delta_seconds: self.shadow_latency_delta_seconds.clone(),\n shadow_errors_total: self.shadow_errors_total.clone(),\n rollover_events_total: self.rollover_events_total.clone(),\n rollover_active_indexes: self.rollover_active_indexes.clone(),\n rollover_documents_expired_total: self.rollover_documents_expired_total.clone(),\n rollover_last_action_seconds: self.rollover_last_action_seconds.clone(),\n canary_runs_total: self.canary_runs_total.clone(),\n canary_latency_ms: self.canary_latency_ms.clone(),\n canary_assertion_failures_total: self.canary_assertion_failures_total.clone(),\n admin_ui_sessions_total: self.admin_ui_sessions_total.clone(),\n admin_ui_action_total: self.admin_ui_action_total.clone(),\n admin_ui_destructive_action_total: self.admin_ui_destructive_action_total.clone(),\n explain_requests_total: self.explain_requests_total.clone(),\n explain_warnings_total: self.explain_warnings_total.clone(),\n explain_execute_total: self.explain_execute_total.clone(),\n search_ui_sessions_total: self.search_ui_sessions_total.clone(),\n search_ui_queries_total: self.search_ui_queries_total.clone(),\n search_ui_zero_hits_total: self.search_ui_zero_hits_total.clone(),\n search_ui_click_through_total: self.search_ui_click_through_total.clone(),\n search_ui_p95_ms: self.search_ui_p95_ms.clone(),\n memory_pressure: self.memory_pressure.clone(),\n cpu_throttled_seconds_total: self.cpu_throttled_seconds_total.clone(),\n request_queue_depth: self.request_queue_depth.clone(),\n background_queue_depth: self.background_queue_depth.clone(),\n peer_pod_count: self.peer_pod_count.clone(),\n leader: self.leader.clone(),\n owned_shards_count: self.owned_shards_count.clone(),\n admin_session_key_generated: self.admin_session_key_generated.clone(),\n admin_session_revoked_total: self.admin_session_revoked_total.clone(),\n settings_broadcast_phase: self.settings_broadcast_phase.clone(),\n settings_hash_mismatch_total: self.settings_hash_mismatch_total.clone(),\n settings_drift_repair_total: self.settings_drift_repair_total.clone(),\n settings_version: self.settings_version.clone(),\n alias_resolutions_total: self.alias_resolutions_total.clone(),\n alias_flips_total: self.alias_flips_total.clone(),\n session_active_count: self.session_active_count.clone(),\n session_pin_enforced_total: self.session_pin_enforced_total.clone(),\n session_wait_duration_seconds: self.session_wait_duration_seconds.clone(),\n session_wait_timeout_total: self.session_wait_timeout_total.clone(),\n }\n }\n}\n\nimpl Default for Metrics {\n fn default() -> Self {\n Self::new(&MiroirConfig::default())\n }\n}\n\nimpl Metrics {\n pub fn new(config: &MiroirConfig) -> Self {\n let registry = Registry::new();\n\n // ── Request metrics ──\n let request_duration = HistogramVec::new(\n HistogramOpts::new(\"miroir_request_duration_seconds\", \"Request latency in seconds\")\n .buckets(vec![0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0, 10.0]),\n &[\"method\", \"path_template\", \"status\"],\n )\n .expect(\"failed to create request_duration histogram\");\n\n let requests_total = CounterVec::new(\n Opts::new(\"miroir_requests_total\", \"Total number of requests\"),\n &[\"method\", \"path_template\", \"status\"],\n )\n .expect(\"failed to create requests_total counter\");\n\n let requests_in_flight = Gauge::with_opts(\n Opts::new(\"miroir_requests_in_flight\", \"Number of requests currently being processed\"),\n )\n .expect(\"failed to create requests_in_flight gauge\");\n\n // ── Node health metrics ──\n let node_healthy = GaugeVec::new(\n Opts::new(\"miroir_node_healthy\", \"Health status of backend nodes (1=healthy, 0=unhealthy)\"),\n &[\"node_id\"],\n )\n .expect(\"failed to create node_healthy gauge\");\n\n let node_request_duration = HistogramVec::new(\n HistogramOpts::new(\"miroir_node_request_duration_seconds\", \"Latency of individual node requests\")\n .buckets(vec![0.001, 0.005, 0.01, 0.025, 0.05, 0.1, 0.5, 1.0]),\n &[\"node_id\", \"operation\"],\n )\n .expect(\"failed to create node_request_duration histogram\");\n\n let node_errors = CounterVec::new(\n Opts::new(\"miroir_node_errors_total\", \"Number of errors from backend nodes\"),\n &[\"node_id\", \"error_type\"],\n )\n .expect(\"failed to create node_errors counter\");\n\n // ── Shard metrics ──\n let shard_coverage = Gauge::with_opts(\n Opts::new(\"miroir_shard_coverage\", \"Fraction of shards with at least one healthy replica\"),\n )\n .expect(\"failed to create shard_coverage gauge\");\n\n let degraded_shards = Gauge::with_opts(\n Opts::new(\"miroir_degraded_shards_total\", \"Number of shards with reduced replica availability\"),\n )\n .expect(\"failed to create degraded_shards gauge\");\n\n let shard_distribution = GaugeVec::new(\n Opts::new(\"miroir_shard_distribution\", \"Number of shards assigned to each node\"),\n &[\"node_id\"],\n )\n .expect(\"failed to create shard_distribution gauge\");\n\n // ── Task metrics ──\n let task_processing_age = Histogram::with_opts(\n HistogramOpts::new(\"miroir_task_processing_age_seconds\", \"Time between task creation and processing start\")\n .buckets(vec![0.01, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0, 10.0, 30.0, 60.0]),\n )\n .expect(\"failed to create task_processing_age histogram\");\n\n let tasks_total = CounterVec::new(\n Opts::new(\"miroir_tasks_total\", \"Total number of tasks by status\"),\n &[\"status\"],\n )\n .expect(\"failed to create tasks_total counter\");\n\n let task_registry_size = Gauge::with_opts(\n Opts::new(\"miroir_task_registry_size\", \"Current number of tasks in the registry\"),\n )\n .expect(\"failed to create task_registry_size gauge\");\n\n // ── Scatter-gather metrics ──\n let scatter_fan_out_size = Histogram::with_opts(\n HistogramOpts::new(\"miroir_scatter_fan_out_size\", \"Number of nodes in scatter operations\")\n .buckets(vec![1.0, 2.0, 3.0, 5.0, 10.0, 20.0, 50.0]),\n )\n .expect(\"failed to create scatter_fan_out_size histogram\");\n\n let scatter_partial_responses = Counter::with_opts(\n Opts::new(\"miroir_scatter_partial_responses_total\", \"Number of scatter responses that were partial (some nodes failed)\"),\n )\n .expect(\"failed to create scatter_partial_responses counter\");\n\n let scatter_retries = Counter::with_opts(\n Opts::new(\"miroir_scatter_retries_total\", \"Number of scatter retry attempts due to node failures\"),\n )\n .expect(\"failed to create scatter_retries counter\");\n\n // ── Rebalancer metrics ──\n let rebalance_in_progress = Gauge::with_opts(\n Opts::new(\"miroir_rebalance_in_progress\", \"Whether a rebalance is currently running (1=yes, 0=no)\"),\n )\n .expect(\"failed to create rebalance_in_progress gauge\");\n\n let rebalance_documents_migrated = Counter::with_opts(\n Opts::new(\"miroir_rebalance_documents_migrated_total\", \"Total number of documents migrated during rebalance\"),\n )\n .expect(\"failed to create rebalance_documents_migrated counter\");\n\n let rebalance_duration = Histogram::with_opts(\n HistogramOpts::new(\"miroir_rebalance_duration_seconds\", \"Duration of rebalance operations\")\n .buckets(vec![1.0, 5.0, 10.0, 30.0, 60.0, 300.0, 600.0, 1800.0, 3600.0]),\n )\n .expect(\"failed to create rebalance_duration histogram\");\n\n // Register all metrics\n macro_rules! reg {\n ($m:expr) => {\n registry.register(Box::new($m.clone())).expect(concat!(\"failed to register \", stringify!($m)));\n };\n }\n\n reg!(request_duration);\n reg!(requests_total);\n reg!(requests_in_flight);\n reg!(node_healthy);\n reg!(node_request_duration);\n reg!(node_errors);\n reg!(shard_coverage);\n reg!(degraded_shards);\n reg!(shard_distribution);\n reg!(task_processing_age);\n reg!(tasks_total);\n reg!(task_registry_size);\n reg!(scatter_fan_out_size);\n reg!(scatter_partial_responses);\n reg!(scatter_retries);\n reg!(rebalance_in_progress);\n reg!(rebalance_documents_migrated);\n reg!(rebalance_duration);\n\n // ── §13.11 Multi-search metrics (cardinality cap: top 100 tenants, rest bucketed) ──\n let (\n multisearch_queries_per_batch,\n multisearch_batches_total,\n multisearch_partial_failures_total,\n multisearch_tenant_session_pin_override_total,\n ) = if config.multi_search.enabled {\n let q = Histogram::with_opts(\n HistogramOpts::new(\"miroir_multisearch_queries_per_batch\", \"Number of queries in each multi-search batch\")\n .buckets(vec![1.0, 2.0, 5.0, 10.0, 25.0, 50.0, 100.0]),\n ).expect(\"create multisearch_queries_per_batch\");\n let b = Counter::with_opts(\n Opts::new(\"miroir_multisearch_batches_total\", \"Total number of multi-search batches processed\"),\n ).expect(\"create multisearch_batches_total\");\n let p = Counter::with_opts(\n Opts::new(\"miroir_multisearch_partial_failures_total\", \"Number of multi-search batches with at least one query failure\"),\n ).expect(\"create multisearch_partial_failures_total\");\n let t = CounterVec::new(\n Opts::new(\"miroir_tenant_session_pin_override_total\", \"Session pin overrides triggered by multi-search tenant routing\"),\n &[\"tenant\"],\n ).expect(\"create multisearch_tenant_session_pin_override_total\");\n reg!(q); reg!(b); reg!(p); reg!(t);\n (Some(q), Some(b), Some(p), Some(t))\n } else {\n (None, None, None, None)\n };\n\n // ── §13.12 Vector search metrics ──\n let (\n vector_search_over_fetched_total,\n vector_merge_strategy,\n vector_embedder_drift_total,\n ) = if config.vector_search.enabled {\n let o = Counter::with_opts(\n Opts::new(\"miroir_vector_search_over_fetched_total\", \"Number of vector searches that over-fetched candidates\"),\n ).expect(\"create vector_search_over_fetched_total\");\n let m = CounterVec::new(\n Opts::new(\"miroir_vector_merge_strategy\", \"Count of hybrid merge strategy selections\"),\n &[\"strategy\"],\n ).expect(\"create vector_merge_strategy\");\n let d = Counter::with_opts(\n Opts::new(\"miroir_vector_embedder_drift_total\", \"Number of embedder drift detections\"),\n ).expect(\"create vector_embedder_drift_total\");\n reg!(o); reg!(m); reg!(d);\n (Some(o), Some(m), Some(d))\n } else {\n (None, None, None)\n };\n\n // ── §13.13 CDC metrics (cardinality cap: top 100 sinks, rest bucketed) ──\n let (\n cdc_events_published_total,\n cdc_lag_seconds,\n cdc_buffer_bytes,\n cdc_dropped_total,\n cdc_events_suppressed_total,\n ) = if config.cdc.enabled {\n let e = CounterVec::new(\n Opts::new(\"miroir_cdc_events_published_total\", \"Total CDC events published\"),\n &[\"sink\", \"index\"],\n ).expect(\"create cdc_events_published_total\");\n let l = GaugeVec::new(\n Opts::new(\"miroir_cdc_lag_seconds\", \"CDC delivery lag in seconds\"),\n &[\"sink\"],\n ).expect(\"create cdc_lag_seconds\");\n let b = GaugeVec::new(\n Opts::new(\"miroir_cdc_buffer_bytes\", \"CDC buffer size in bytes\"),\n &[\"sink\"],\n ).expect(\"create cdc_buffer_bytes\");\n let d = CounterVec::new(\n Opts::new(\"miroir_cdc_dropped_total\", \"CDC events dropped due to buffer overflow\"),\n &[\"sink\"],\n ).expect(\"create cdc_dropped_total\");\n let s = CounterVec::new(\n Opts::new(\"miroir_cdc_events_suppressed_total\", \"CDC events suppressed by origin deduplication\"),\n &[\"origin\"],\n ).expect(\"create cdc_events_suppressed_total\");\n reg!(e); reg!(l); reg!(b); reg!(d); reg!(s);\n (Some(e), Some(l), Some(b), Some(d), Some(s))\n } else {\n (None, None, None, None, None)\n };\n\n // ── §13.14 TTL metrics (cardinality cap: top 100 indexes, rest bucketed) ──\n let (\n ttl_documents_expired_total,\n ttl_sweep_duration_seconds,\n ttl_pending_estimate,\n ) = if config.ttl.enabled {\n let e = CounterVec::new(\n Opts::new(\"miroir_ttl_documents_expired_total\", \"Documents expired by TTL sweeper\"),\n &[\"index\"],\n ).expect(\"create ttl_documents_expired_total\");\n let d = HistogramVec::new(\n HistogramOpts::new(\"miroir_ttl_sweep_duration_seconds\", \"Duration of TTL sweep cycles\")\n .buckets(vec![0.01, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0, 10.0]),\n &[\"index\"],\n ).expect(\"create ttl_sweep_duration_seconds\");\n let p = GaugeVec::new(\n Opts::new(\"miroir_ttl_pending_estimate\", \"Estimated documents pending TTL expiry\"),\n &[\"index\"],\n ).expect(\"create ttl_pending_estimate\");\n reg!(e); reg!(d); reg!(p);\n (Some(e), Some(d), Some(p))\n } else {\n (None, None, None)\n };\n\n // ── §13.15 Tenant affinity metrics (cardinality cap: top 100 tenants, rest bucketed) ──\n let (\n tenant_queries_total,\n tenant_pinned_groups,\n tenant_fallback_total,\n ) = if config.tenant_affinity.enabled {\n let q = CounterVec::new(\n Opts::new(\"miroir_tenant_queries_total\", \"Queries routed per tenant and group\"),\n &[\"tenant\", \"group\"],\n ).expect(\"create tenant_queries_total\");\n let p = GaugeVec::new(\n Opts::new(\"miroir_tenant_pinned_groups\", \"Current pinned group per tenant\"),\n &[\"tenant\"],\n ).expect(\"create tenant_pinned_groups\");\n let f = CounterVec::new(\n Opts::new(\"miroir_tenant_fallback_total\", \"Tenant affinity fallback invocations\"),\n &[\"reason\"],\n ).expect(\"create tenant_fallback_total\");\n reg!(q); reg!(p); reg!(f);\n (Some(q), Some(p), Some(f))\n } else {\n (None, None, None)\n };\n\n // ── §13.16 Shadow traffic metrics ──\n let (\n shadow_diff_total,\n shadow_kendall_tau,\n shadow_latency_delta_seconds,\n shadow_errors_total,\n ) = if config.shadow.enabled {\n let d = CounterVec::new(\n Opts::new(\"miroir_shadow_diff_total\", \"Shadow comparison diffs by kind\"),\n &[\"kind\"],\n ).expect(\"create shadow_diff_total\");\n let k = Gauge::with_opts(\n Opts::new(\"miroir_shadow_kendall_tau\", \"Kendall tau rank correlation between shadow and primary\"),\n ).expect(\"create shadow_kendall_tau\");\n let l = Histogram::with_opts(\n HistogramOpts::new(\"miroir_shadow_latency_delta_seconds\", \"Latency difference between shadow and primary\")\n .buckets(vec![-1.0, -0.5, -0.1, -0.01, 0.0, 0.01, 0.1, 0.5, 1.0]),\n ).expect(\"create shadow_latency_delta_seconds\");\n let e = CounterVec::new(\n Opts::new(\"miroir_shadow_errors_total\", \"Shadow pipeline errors\"),\n &[\"target\", \"side\"],\n ).expect(\"create shadow_errors_total\");\n reg!(d); reg!(k); reg!(l); reg!(e);\n (Some(d), Some(k), Some(l), Some(e))\n } else {\n (None, None, None, None)\n };\n\n // ── §13.17 ILM metrics (cardinality cap: top 100 policies/aliases, rest bucketed) ──\n let (\n rollover_events_total,\n rollover_active_indexes,\n rollover_documents_expired_total,\n rollover_last_action_seconds,\n ) = if config.ilm.enabled {\n let e = CounterVec::new(\n Opts::new(\"miroir_rollover_events_total\", \"ILM rollover events\"),\n &[\"policy\"],\n ).expect(\"create rollover_events_total\");\n let a = GaugeVec::new(\n Opts::new(\"miroir_rollover_active_indexes\", \"Active write indexes per alias\"),\n &[\"alias\"],\n ).expect(\"create rollover_active_indexes\");\n let d = CounterVec::new(\n Opts::new(\"miroir_rollover_documents_expired_total\", \"Documents expired by ILM retention policies\"),\n &[\"policy\"],\n ).expect(\"create rollover_documents_expired_total\");\n let l = GaugeVec::new(\n Opts::new(\"miroir_rollover_last_action_seconds\", \"Seconds since last rollover action per policy\"),\n &[\"policy\"],\n ).expect(\"create rollover_last_action_seconds\");\n reg!(e); reg!(a); reg!(d); reg!(l);\n (Some(e), Some(a), Some(d), Some(l))\n } else {\n (None, None, None, None)\n };\n\n // ── §13.18 Canary metrics (cardinality cap: top 100 canaries, rest bucketed) ──\n let (\n canary_runs_total,\n canary_latency_ms,\n canary_assertion_failures_total,\n ) = if config.canary_runner.enabled {\n let r = CounterVec::new(\n Opts::new(\"miroir_canary_runs_total\", \"Canary run results\"),\n &[\"canary\", \"result\"],\n ).expect(\"create canary_runs_total\");\n let l = HistogramVec::new(\n HistogramOpts::new(\"miroir_canary_latency_ms\", \"Canary execution latency\")\n .buckets(vec![1.0, 5.0, 10.0, 25.0, 50.0, 100.0, 250.0, 500.0, 1000.0]),\n &[\"canary\"],\n ).expect(\"create canary_latency_ms\");\n let a = CounterVec::new(\n Opts::new(\"miroir_canary_assertion_failures_total\", \"Canary assertion failures\"),\n &[\"canary\", \"assertion_type\"],\n ).expect(\"create canary_assertion_failures_total\");\n reg!(r); reg!(l); reg!(a);\n (Some(r), Some(l), Some(a))\n } else {\n (None, None, None)\n };\n\n // ── §13.19 Admin UI metrics ──\n let (\n admin_ui_sessions_total,\n admin_ui_action_total,\n admin_ui_destructive_action_total,\n ) = if config.admin_ui.enabled {\n let s = Counter::with_opts(\n Opts::new(\"miroir_admin_ui_sessions_total\", \"Admin UI sessions started\"),\n ).expect(\"create admin_ui_sessions_total\");\n let a = CounterVec::new(\n Opts::new(\"miroir_admin_ui_action_total\", \"Admin UI actions by type\"),\n &[\"action\"],\n ).expect(\"create admin_ui_action_total\");\n let d = CounterVec::new(\n Opts::new(\"miroir_admin_ui_destructive_action_total\", \"Admin UI destructive actions (delete, drop, etc.)\"),\n &[\"action\"],\n ).expect(\"create admin_ui_destructive_action_total\");\n reg!(s); reg!(a); reg!(d);\n (Some(s), Some(a), Some(d))\n } else {\n (None, None, None)\n };\n\n // ── §13.20 Explain metrics ──\n let (\n explain_requests_total,\n explain_warnings_total,\n explain_execute_total,\n ) = if config.explain.enabled {\n let r = Counter::with_opts(\n Opts::new(\"miroir_explain_requests_total\", \"Explain API requests\"),\n ).expect(\"create explain_requests_total\");\n let w = CounterVec::new(\n Opts::new(\"miroir_explain_warnings_total\", \"Explain warnings by type\"),\n &[\"warning_type\"],\n ).expect(\"create explain_warnings_total\");\n let e = Counter::with_opts(\n Opts::new(\"miroir_explain_execute_total\", \"Explain requests with execute=true\"),\n ).expect(\"create explain_execute_total\");\n reg!(r); reg!(w); reg!(e);\n (Some(r), Some(w), Some(e))\n } else {\n (None, None, None)\n };\n\n // ── §13.21 Search UI metrics (cardinality cap: top 100 indexes, rest bucketed) ──\n let (\n search_ui_sessions_total,\n search_ui_queries_total,\n search_ui_zero_hits_total,\n search_ui_click_through_total,\n search_ui_p95_ms,\n ) = if config.search_ui.enabled {\n let s = Counter::with_opts(\n Opts::new(\"miroir_search_ui_sessions_total\", \"Search UI sessions\"),\n ).expect(\"create search_ui_sessions_total\");\n let q = CounterVec::new(\n Opts::new(\"miroir_search_ui_queries_total\", \"Search UI queries per index\"),\n &[\"index\"],\n ).expect(\"create search_ui_queries_total\");\n let z = CounterVec::new(\n Opts::new(\"miroir_search_ui_zero_hits_total\", \"Search UI zero-hit queries per index\"),\n &[\"index\"],\n ).expect(\"create search_ui_zero_hits_total\");\n let c = CounterVec::new(\n Opts::new(\"miroir_search_ui_click_through_total\", \"Search UI click-through events per index\"),\n &[\"index\"],\n ).expect(\"create search_ui_click_through_total\");\n let p = GaugeVec::new(\n Opts::new(\"miroir_search_ui_p95_ms\", \"Search UI p95 query latency per index\"),\n &[\"index\"],\n ).expect(\"create search_ui_p95_ms\");\n reg!(s); reg!(q); reg!(z); reg!(c); reg!(p);\n (Some(s), Some(q), Some(z), Some(c), Some(p))\n } else {\n (None, None, None, None, None)\n };\n\n // ── §14.9 Resource-pressure metrics (always present) ──\n let memory_pressure = Gauge::with_opts(\n Opts::new(\"miroir_memory_pressure\", \"Memory pressure level (0=none, 1=low, 2=moderate/high)\")\n ).expect(\"create memory_pressure\");\n let cpu_throttled_seconds_total = Counter::with_opts(\n Opts::new(\"miroir_cpu_throttled_seconds_total\", \"Total seconds of CPU throttling\")\n ).expect(\"create cpu_throttled_seconds_total\");\n let request_queue_depth = Gauge::with_opts(\n Opts::new(\"miroir_request_queue_depth\", \"Number of requests queued waiting for processing\")\n ).expect(\"create request_queue_depth\");\n let background_queue_depth = GaugeVec::new(\n Opts::new(\"miroir_background_queue_depth\", \"Number of background jobs queued by type\"),\n &[\"job_type\"],\n ).expect(\"create background_queue_depth\");\n let peer_pod_count = Gauge::with_opts(\n Opts::new(\"miroir_peer_pod_count\", \"Number of peer miroir pods discovered\")\n ).expect(\"create peer_pod_count\");\n let leader = Gauge::with_opts(\n Opts::new(\"miroir_leader\", \"Whether this pod holds the leader lease (1=yes, 0=no)\")\n ).expect(\"create leader\");\n let owned_shards_count = Gauge::with_opts(\n Opts::new(\"miroir_owned_shards_count\", \"Number of shards owned by this pod\")\n ).expect(\"create owned_shards_count\");\n reg!(memory_pressure);\n reg!(cpu_throttled_seconds_total);\n reg!(request_queue_depth);\n reg!(background_queue_depth);\n reg!(peer_pod_count);\n reg!(leader);\n reg!(owned_shards_count);\n\n // ── Admin session sealing metrics (always present) ──\n let admin_session_key_generated = Gauge::with_opts(\n Opts::new(\"miroir_admin_session_key_generated\",\n \"Whether ADMIN_SESSION_SEAL_KEY was generated at startup (1=yes, 0=set via env)\")\n ).expect(\"create admin_session_key_generated\");\n let admin_session_revoked_total = Counter::with_opts(\n Opts::new(\"miroir_admin_session_revoked_total\",\n \"Admin sessions revoked via logout\")\n ).expect(\"create admin_session_revoked_total\");\n reg!(admin_session_key_generated);\n reg!(admin_session_revoked_total);\n\n // ── §13.5 Two-phase settings broadcast metrics (always present) ──\n let settings_broadcast_phase = GaugeVec::new(\n Opts::new(\"miroir_settings_broadcast_phase\", \"Current phase of settings broadcast (0=idle, 1=propose, 2=verify, 3=commit)\"),\n &[\"index\"],\n ).expect(\"create settings_broadcast_phase\");\n let settings_hash_mismatch_total = Counter::with_opts(\n Opts::new(\"miroir_settings_hash_mismatch_total\", \"Settings hash mismatches detected during verify phase\"),\n ).expect(\"create settings_hash_mismatch_total\");\n let settings_drift_repair_total = CounterVec::new(\n Opts::new(\"miroir_settings_drift_repair_total\", \"Settings drift repairs performed by drift reconciler\"),\n &[\"index\"],\n ).expect(\"create settings_drift_repair_total\");\n let settings_version = GaugeVec::new(\n Opts::new(\"miroir_settings_version\", \"Current settings version per index\"),\n &[\"index\"],\n ).expect(\"create settings_version\");\n reg!(settings_broadcast_phase);\n reg!(settings_hash_mismatch_total);\n reg!(settings_drift_repair_total);\n reg!(settings_version);\n\n // ── §13.7 Alias metrics (always present) ──\n let alias_resolutions_total = CounterVec::new(\n Opts::new(\"miroir_alias_resolutions_total\", \"Number of alias resolutions\"),\n &[\"alias\"],\n ).expect(\"create alias_resolutions_total\");\n let alias_flips_total = CounterVec::new(\n Opts::new(\"miroir_alias_flips_total\", \"Number of alias flips\"),\n &[\"alias\"],\n ).expect(\"create alias_flips_total\");\n reg!(alias_resolutions_total);\n reg!(alias_flips_total);\n\n // ── §13.6 Session pinning metrics (always present) ──\n let session_active_count = Gauge::new(\n \"miroir_session_active_count\",\n \"Number of active sessions\",\n ).expect(\"create session_active_count\");\n let session_pin_enforced_total = CounterVec::new(\n Opts::new(\"miroir_session_pin_enforced_total\", \"Number of times session pin was enforced\"),\n &[\"strategy\"],\n ).expect(\"create session_pin_enforced_total\");\n let session_wait_duration_seconds = Histogram::with_opts(\n HistogramOpts::new(\n \"miroir_session_wait_duration_seconds\",\n \"Duration of session pin wait operations\",\n )\n .buckets(vec![0.001, 0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0]),\n ).expect(\"create session_wait_duration_seconds\");\n let session_wait_timeout_total = CounterVec::new(\n Opts::new(\"miroir_session_wait_timeout_total\", \"Number of session pin wait timeouts\"),\n &[\"strategy\"],\n ).expect(\"create session_wait_timeout_total\");\n reg!(session_active_count);\n reg!(session_pin_enforced_total);\n reg!(session_wait_duration_seconds);\n reg!(session_wait_timeout_total);\n\n Self {\n registry,\n request_duration,\n requests_total,\n requests_in_flight,\n node_healthy,\n node_request_duration,\n node_errors,\n shard_coverage,\n degraded_shards,\n shard_distribution,\n task_processing_age,\n tasks_total,\n task_registry_size,\n scatter_fan_out_size,\n scatter_partial_responses,\n scatter_retries,\n rebalance_in_progress,\n rebalance_documents_migrated,\n rebalance_duration,\n multisearch_queries_per_batch,\n multisearch_batches_total,\n multisearch_partial_failures_total,\n multisearch_tenant_session_pin_override_total,\n vector_search_over_fetched_total,\n vector_merge_strategy,\n vector_embedder_drift_total,\n cdc_events_published_total,\n cdc_lag_seconds,\n cdc_buffer_bytes,\n cdc_dropped_total,\n cdc_events_suppressed_total,\n ttl_documents_expired_total,\n ttl_sweep_duration_seconds,\n ttl_pending_estimate,\n tenant_queries_total,\n tenant_pinned_groups,\n tenant_fallback_total,\n shadow_diff_total,\n shadow_kendall_tau,\n shadow_latency_delta_seconds,\n shadow_errors_total,\n rollover_events_total,\n rollover_active_indexes,\n rollover_documents_expired_total,\n rollover_last_action_seconds,\n canary_runs_total,\n canary_latency_ms,\n canary_assertion_failures_total,\n admin_ui_sessions_total,\n admin_ui_action_total,\n admin_ui_destructive_action_total,\n explain_requests_total,\n explain_warnings_total,\n explain_execute_total,\n search_ui_sessions_total,\n search_ui_queries_total,\n search_ui_zero_hits_total,\n search_ui_click_through_total,\n search_ui_p95_ms,\n memory_pressure,\n cpu_throttled_seconds_total,\n request_queue_depth,\n background_queue_depth,\n peer_pod_count,\n leader,\n owned_shards_count,\n admin_session_key_generated,\n admin_session_revoked_total,\n settings_broadcast_phase,\n settings_hash_mismatch_total,\n settings_drift_repair_total,\n settings_version,\n alias_resolutions_total,\n alias_flips_total,\n session_active_count,\n session_pin_enforced_total,\n session_wait_duration_seconds,\n session_wait_timeout_total,\n }\n }\n\n pub fn encode_metrics(&self) -> Result {\n let encoder = TextEncoder::new();\n let metric_families = self.registry.gather();\n let mut buffer = Vec::new();\n encoder.encode(&metric_families, &mut buffer)?;\n Ok(String::from_utf8(buffer).map_err(|e| {\n prometheus::Error::Msg(format!(\"failed to convert metrics to UTF-8: {}\", e))\n })?)\n }\n\n pub fn admin_session_key_generated(&self) -> Gauge {\n self.admin_session_key_generated.clone()\n }\n\n pub fn admin_session_revoked_total(&self) -> Counter {\n self.admin_session_revoked_total.clone()\n }\n}\n\n/// Generate a short request ID from UUIDv7.\n///\n/// UUIDv7 provides time-ordered unique IDs. We take the first 8 hex characters,\n/// hash them, and encode as hex for a short, URL-safe identifier.\npub fn generate_request_id() -> String {\n let uuid = Uuid::now_v7();\n let uuid_str = uuid.simple().to_string();\n // Take first 8 chars (enough entropy for uniqueness)\n let prefix = &uuid_str[..8];\n\n // Hash to get a consistent short representation\n let mut hasher = DefaultHasher::new();\n prefix.hash(&mut hasher);\n let hash = hasher.finish();\n\n // Encode as hex (16 chars = 64 bits)\n format!(\"{:016x}\", hash)\n}\n\n/// Extension trait to add request ID extraction utilities.\npub trait RequestIdExt {\n fn get_request_id(&self) -> Option;\n fn set_request_id(&mut self, id: &str);\n}\n\nimpl RequestIdExt for HeaderMap {\n fn get_request_id(&self) -> Option {\n self.get(\"x-request-id\")\n .and_then(|v| v.to_str().ok())\n .map(|s| s.to_string())\n }\n\n fn set_request_id(&mut self, id: &str) {\n if let Ok(val) = HeaderValue::from_str(id) {\n self.insert(\"x-request-id\", val);\n }\n }\n}\n\n/// Guard that decrements the in-flight gauge when dropped.\n///\n/// This ensures that even if the handler panics, the in-flight count\n/// is accurately decremented.\nstruct InFlightGuard {\n metrics: Metrics,\n request_id: String,\n}\n\nimpl InFlightGuard {\n fn new(metrics: Metrics, request_id: String) -> Self {\n metrics.requests_in_flight.inc();\n tracing::trace!(\n request_id = %request_id,\n requests_in_flight = metrics.requests_in_flight.get(),\n \"request started\"\n );\n Self { metrics, request_id }\n }\n}\n\nimpl Drop for InFlightGuard {\n fn drop(&mut self) {\n self.metrics.requests_in_flight.dec();\n tracing::trace!(\n request_id = %self.request_id,\n requests_in_flight = self.metrics.requests_in_flight.get(),\n \"request completed\"\n );\n }\n}\n\n/// Extract the path template from the matched route.\n///\n/// Axum's MatchedPath extractor provides the route template (e.g., \"/indexes/{uid}/search\")\n/// instead of the actual path (e.g., \"/indexes/products/search\"), avoiding high-cardinality labels.\nfn extract_path_template(request: &Request) -> String {\n request\n .extensions()\n .get::()\n .map(|mp| mp.as_str())\n .unwrap_or_else(|| request.uri().path())\n .to_string()\n}\n\n/// Main middleware that combines request ID injection, structured logging, and Prometheus metrics.\n///\n/// IMPORTANT: This middleware must be applied AFTER request_id_middleware in the layer stack\n/// (i.e., its layer() call must come BEFORE request_id_middleware's layer() call).\n/// This ensures the request_id header is already set when this middleware runs.\npub async fn telemetry_middleware(\n State(telemetry): State,\n mut req: Request,\n next: Next,\n) -> Response {\n let start = Instant::now();\n let method = req.method().clone();\n let path_template = extract_path_template(&req);\n let metrics = telemetry.metrics.clone();\n let pod_id = telemetry.pod_id.clone();\n\n // Extract request ID from header (set by request_id_middleware)\n // The header must already exist because request_id_middleware runs first.\n let request_id = req\n .headers()\n .get_request_id()\n .expect(\"request_id header must be set by request_id_middleware\");\n req.headers_mut().set_request_id(&request_id);\n\n // Create span for structured logging with pod_id included.\n // Note: raw path is intentionally omitted to avoid logging index names\n // (which may contain customer identifiers). Use path_template instead.\n let span = info_span!(\n \"request\",\n request_id = %request_id,\n pod_id = %pod_id,\n method = %method,\n path_template = %path_template,\n );\n\n let _guard = span.enter();\n\n // Track in-flight requests\n let in_flight = InFlightGuard::new(metrics.clone(), request_id.clone());\n\n let response = next.run(req).await;\n\n drop(in_flight);\n\n let status = response.status();\n let status_u16 = status.as_u16();\n let duration = start.elapsed();\n\n // Record Prometheus metrics\n metrics\n .request_duration\n .with_label_values(&[method.as_str(), &path_template, &status_u16.to_string()])\n .observe(duration.as_secs_f64());\n metrics\n .requests_total\n .with_label_values(&[method.as_str(), &path_template, &status_u16.to_string()])\n .inc();\n\n // Structured log entry (plan §10 shape)\n // Base fields: timestamp (from tracing-subscriber), level, message, duration_ms\n // Additional fields (index, node_count, estimated_hits, degraded)\n // are added by request handlers via the tracing span.\n let message = format!(\"{} {}\", method, status);\n if status.is_server_error() {\n tracing::error!(\n target: \"miroir.request\",\n pod_id = %pod_id,\n request_id = %request_id,\n message = %message,\n duration_ms = duration.as_millis() as u64,\n status = status_u16,\n method = %method,\n path_template = %path_template,\n );\n } else if status.is_client_error() {\n tracing::warn!(\n target: \"miroir.request\",\n pod_id = %pod_id,\n request_id = %request_id,\n message = %message,\n duration_ms = duration.as_millis() as u64,\n status = status_u16,\n method = %method,\n path_template = %path_template,\n );\n } else {\n tracing::info!(\n target: \"miroir.request\",\n pod_id = %pod_id,\n request_id = %request_id,\n message = %message,\n duration_ms = duration.as_millis() as u64,\n status = status_u16,\n method = %method,\n path_template = %path_template,\n );\n }\n\n // Ensure request ID is in response headers\n let mut response = response;\n if !response.headers().contains_key(\"x-request-id\") {\n if let Ok(val) = HeaderValue::from_str(&request_id) {\n response.headers_mut().insert(\"x-request-id\", val);\n }\n }\n\n response\n}\n\n/// Create the metrics router for the :9090 server.\npub fn metrics_router() -> Router {\n Router::new().route(\"/metrics\", get(metrics_handler))\n}\n\n/// Handler that returns Prometheus metrics in text exposition format.\nasync fn metrics_handler(State(metrics): State) -> String {\n match metrics.encode_metrics() {\n Ok(metrics) => metrics,\n Err(e) => {\n tracing::error!(error = %e, \"failed to encode metrics\");\n format!(\"# ERROR: failed to encode metrics: {}\\n\", e)\n }\n }\n}\n\n/// Accessor methods for metrics that can be used by other parts of the application.\nimpl Metrics {\n // ── Request metrics ──\n\n pub fn record_request_duration(&self, method: &str, path_template: &str, status: u16, duration_secs: f64) {\n self.request_duration.with_label_values(&[method, path_template, &status.to_string()]).observe(duration_secs);\n }\n\n pub fn inc_requests_total(&self, method: &str, path_template: &str, status: u16) {\n self.requests_total.with_label_values(&[method, path_template, &status.to_string()]).inc();\n }\n\n // ── Scatter-gather ──\n\n pub fn record_scatter_fan_out(&self, size: u64) {\n self.scatter_fan_out_size.observe(size as f64);\n }\n\n pub fn inc_scatter_partial_responses(&self) {\n self.scatter_partial_responses.inc();\n }\n\n pub fn inc_scatter_retries(&self) {\n self.scatter_retries.inc();\n }\n\n // ── Node health ──\n\n pub fn set_node_healthy(&self, node_id: &str, healthy: bool) {\n self.node_healthy.with_label_values(&[node_id]).set(if healthy { 1.0 } else { 0.0 });\n }\n\n pub fn record_node_request_duration(&self, node_id: &str, operation: &str, duration_secs: f64) {\n self.node_request_duration.with_label_values(&[node_id, operation]).observe(duration_secs);\n }\n\n pub fn inc_node_errors(&self, node_id: &str, error_type: &str) {\n self.node_errors.with_label_values(&[node_id, error_type]).inc();\n }\n\n // ── Shards ──\n\n pub fn set_shard_coverage(&self, coverage: f64) {\n self.shard_coverage.set(coverage);\n }\n\n pub fn set_degraded_shards(&self, count: f64) {\n self.degraded_shards.set(count);\n }\n\n pub fn set_shard_distribution(&self, node_id: &str, count: f64) {\n self.shard_distribution.with_label_values(&[node_id]).set(count);\n }\n\n // ── Tasks ──\n\n pub fn observe_task_processing_age(&self, age_secs: f64) {\n self.task_processing_age.observe(age_secs);\n }\n\n pub fn inc_tasks_total(&self, status: &str) {\n self.tasks_total.with_label_values(&[status]).inc();\n }\n\n pub fn set_task_registry_size(&self, size: f64) {\n self.task_registry_size.set(size);\n }\n\n // ── Rebalancer ──\n\n pub fn set_rebalance_in_progress(&self, v: bool) {\n self.rebalance_in_progress.set(if v { 1.0 } else { 0.0 });\n }\n\n pub fn inc_rebalance_documents_migrated(&self, count: u64) {\n self.rebalance_documents_migrated.inc_by(count as f64);\n }\n\n pub fn observe_rebalance_duration(&self, secs: f64) {\n self.rebalance_duration.observe(secs);\n }\n\n // ── §13.11 Multi-search ──\n\n pub fn observe_multisearch_queries_per_batch(&self, count: u64) {\n if let Some(ref m) = self.multisearch_queries_per_batch {\n m.observe(count as f64);\n }\n }\n\n pub fn inc_multisearch_batches_total(&self) {\n if let Some(ref m) = self.multisearch_batches_total {\n m.inc();\n }\n }\n\n pub fn inc_multisearch_partial_failures(&self) {\n if let Some(ref m) = self.multisearch_partial_failures_total {\n m.inc();\n }\n }\n\n pub fn inc_multisearch_tenant_session_pin_override(&self, tenant: &str) {\n if let Some(ref m) = self.multisearch_tenant_session_pin_override_total {\n m.with_label_values(&[tenant]).inc();\n }\n }\n\n // ── §13.12 Vector search ──\n\n pub fn inc_vector_search_over_fetched(&self) {\n if let Some(ref m) = self.vector_search_over_fetched_total {\n m.inc();\n }\n }\n\n pub fn inc_vector_merge_strategy(&self, strategy: &str) {\n if let Some(ref m) = self.vector_merge_strategy {\n m.with_label_values(&[strategy]).inc();\n }\n }\n\n pub fn inc_vector_embedder_drift(&self) {\n if let Some(ref m) = self.vector_embedder_drift_total {\n m.inc();\n }\n }\n\n // ── §13.13 CDC ──\n\n pub fn inc_cdc_events_published(&self, sink: &str, index: &str) {\n if let Some(ref m) = self.cdc_events_published_total {\n m.with_label_values(&[sink, index]).inc();\n }\n }\n\n pub fn set_cdc_lag_seconds(&self, sink: &str, lag: f64) {\n if let Some(ref m) = self.cdc_lag_seconds {\n m.with_label_values(&[sink]).set(lag);\n }\n }\n\n pub fn set_cdc_buffer_bytes(&self, sink: &str, bytes: f64) {\n if let Some(ref m) = self.cdc_buffer_bytes {\n m.with_label_values(&[sink]).set(bytes);\n }\n }\n\n pub fn inc_cdc_dropped(&self, sink: &str) {\n if let Some(ref m) = self.cdc_dropped_total {\n m.with_label_values(&[sink]).inc();\n }\n }\n\n pub fn inc_cdc_events_suppressed(&self, origin: &str) {\n if let Some(ref m) = self.cdc_events_suppressed_total {\n m.with_label_values(&[origin]).inc();\n }\n }\n\n // ── §13.14 TTL ──\n\n pub fn inc_ttl_documents_expired(&self, index: &str) {\n if let Some(ref m) = self.ttl_documents_expired_total {\n m.with_label_values(&[index]).inc();\n }\n }\n\n pub fn observe_ttl_sweep_duration(&self, index: &str, secs: f64) {\n if let Some(ref m) = self.ttl_sweep_duration_seconds {\n m.with_label_values(&[index]).observe(secs);\n }\n }\n\n pub fn set_ttl_pending_estimate(&self, index: &str, count: f64) {\n if let Some(ref m) = self.ttl_pending_estimate {\n m.with_label_values(&[index]).set(count);\n }\n }\n\n // ── §13.15 Tenant affinity ──\n\n pub fn inc_tenant_queries(&self, tenant: &str, group: &str) {\n if let Some(ref m) = self.tenant_queries_total {\n m.with_label_values(&[tenant, group]).inc();\n }\n }\n\n pub fn set_tenant_pinned_groups(&self, tenant: &str, group: u32) {\n if let Some(ref m) = self.tenant_pinned_groups {\n m.with_label_values(&[tenant]).set(group as f64);\n }\n }\n\n pub fn inc_tenant_fallback(&self, reason: &str) {\n if let Some(ref m) = self.tenant_fallback_total {\n m.with_label_values(&[reason]).inc();\n }\n }\n\n // ── §13.16 Shadow ──\n\n pub fn inc_shadow_diff(&self, kind: &str) {\n if let Some(ref m) = self.shadow_diff_total {\n m.with_label_values(&[kind]).inc();\n }\n }\n\n pub fn set_shadow_kendall_tau(&self, tau: f64) {\n if let Some(ref m) = self.shadow_kendall_tau {\n m.set(tau);\n }\n }\n\n pub fn observe_shadow_latency_delta(&self, delta: f64) {\n if let Some(ref m) = self.shadow_latency_delta_seconds {\n m.observe(delta);\n }\n }\n\n pub fn inc_shadow_errors(&self, target: &str, side: &str) {\n if let Some(ref m) = self.shadow_errors_total {\n m.with_label_values(&[target, side]).inc();\n }\n }\n\n // ── §13.17 ILM ──\n\n pub fn inc_rollover_events(&self, policy: &str) {\n if let Some(ref m) = self.rollover_events_total {\n m.with_label_values(&[policy]).inc();\n }\n }\n\n pub fn set_rollover_active_indexes(&self, alias: &str, count: f64) {\n if let Some(ref m) = self.rollover_active_indexes {\n m.with_label_values(&[alias]).set(count);\n }\n }\n\n pub fn inc_rollover_documents_expired(&self, policy: &str) {\n if let Some(ref m) = self.rollover_documents_expired_total {\n m.with_label_values(&[policy]).inc();\n }\n }\n\n pub fn set_rollover_last_action_seconds(&self, policy: &str, secs: f64) {\n if let Some(ref m) = self.rollover_last_action_seconds {\n m.with_label_values(&[policy]).set(secs);\n }\n }\n\n // ── §13.18 Canary ──\n\n pub fn inc_canary_runs(&self, canary: &str, result: &str) {\n if let Some(ref m) = self.canary_runs_total {\n m.with_label_values(&[canary, result]).inc();\n }\n }\n\n pub fn observe_canary_latency_ms(&self, canary: &str, ms: f64) {\n if let Some(ref m) = self.canary_latency_ms {\n m.with_label_values(&[canary]).observe(ms);\n }\n }\n\n pub fn inc_canary_assertion_failures(&self, canary: &str, assertion_type: &str) {\n if let Some(ref m) = self.canary_assertion_failures_total {\n m.with_label_values(&[canary, assertion_type]).inc();\n }\n }\n\n // ── §13.19 Admin UI ──\n\n pub fn inc_admin_ui_sessions(&self) {\n if let Some(ref m) = self.admin_ui_sessions_total {\n m.inc();\n }\n }\n\n pub fn inc_admin_ui_action(&self, action: &str) {\n if let Some(ref m) = self.admin_ui_action_total {\n m.with_label_values(&[action]).inc();\n }\n }\n\n pub fn inc_admin_ui_destructive_action(&self, action: &str) {\n if let Some(ref m) = self.admin_ui_destructive_action_total {\n m.with_label_values(&[action]).inc();\n }\n }\n\n // ── §13.20 Explain ──\n\n pub fn inc_explain_requests(&self) {\n if let Some(ref m) = self.explain_requests_total {\n m.inc();\n }\n }\n\n pub fn inc_explain_warnings(&self, warning_type: &str) {\n if let Some(ref m) = self.explain_warnings_total {\n m.with_label_values(&[warning_type]).inc();\n }\n }\n\n pub fn inc_explain_execute(&self) {\n if let Some(ref m) = self.explain_execute_total {\n m.inc();\n }\n }\n\n // ── §13.21 Search UI ──\n\n pub fn inc_search_ui_sessions(&self) {\n if let Some(ref m) = self.search_ui_sessions_total {\n m.inc();\n }\n }\n\n pub fn inc_search_ui_queries(&self, index: &str) {\n if let Some(ref m) = self.search_ui_queries_total {\n m.with_label_values(&[index]).inc();\n }\n }\n\n pub fn inc_search_ui_zero_hits(&self, index: &str) {\n if let Some(ref m) = self.search_ui_zero_hits_total {\n m.with_label_values(&[index]).inc();\n }\n }\n\n pub fn inc_search_ui_click_through(&self, index: &str) {\n if let Some(ref m) = self.search_ui_click_through_total {\n m.with_label_values(&[index]).inc();\n }\n }\n\n pub fn set_search_ui_p95_ms(&self, index: &str, ms: f64) {\n if let Some(ref m) = self.search_ui_p95_ms {\n m.with_label_values(&[index]).set(ms);\n }\n }\n\n // ── §14.9 Resource-pressure ──\n\n pub fn set_memory_pressure(&self, level: u32) {\n self.memory_pressure.set(level as f64);\n }\n\n pub fn inc_cpu_throttled_seconds(&self, secs: f64) {\n self.cpu_throttled_seconds_total.inc_by(secs);\n }\n\n pub fn set_request_queue_depth(&self, depth: u64) {\n self.request_queue_depth.set(depth as f64);\n }\n\n pub fn set_background_queue_depth(&self, job_type: &str, depth: u64) {\n self.background_queue_depth.with_label_values(&[job_type]).set(depth as f64);\n }\n\n pub fn set_peer_pod_count(&self, count: u64) {\n self.peer_pod_count.set(count as f64);\n }\n\n pub fn set_leader(&self, is_leader: bool) {\n self.leader.set(if is_leader { 1.0 } else { 0.0 });\n }\n\n pub fn set_owned_shards_count(&self, count: u64) {\n self.owned_shards_count.set(count as f64);\n }\n\n // ── §13.5 Two-phase settings broadcast metrics ──\n\n pub fn set_settings_broadcast_phase(&self, index: &str, phase: u8) {\n self.settings_broadcast_phase.with_label_values(&[index]).set(phase as f64);\n }\n\n pub fn clear_settings_broadcast_phase(&self, index: &str) {\n self.settings_broadcast_phase.with_label_values(&[index]).set(0.0);\n }\n\n pub fn inc_settings_hash_mismatch(&self) {\n self.settings_hash_mismatch_total.inc();\n }\n\n pub fn inc_settings_drift_repair(&self, index: &str) {\n self.settings_drift_repair_total.with_label_values(&[index]).inc();\n }\n\n pub fn set_settings_version(&self, index: &str, version: u64) {\n self.settings_version.with_label_values(&[index]).set(version as f64);\n }\n\n pub fn get_settings_version(&self, index: &str) -> f64 {\n self.settings_version.with_label_values(&[index]).get()\n }\n\n // ── §13.7 Alias metrics ──\n\n pub fn inc_alias_resolution(&self, alias: &str) {\n self.alias_resolutions_total.with_label_values(&[alias]).inc();\n }\n\n pub fn inc_alias_flip(&self, alias: &str) {\n self.alias_flips_total.with_label_values(&[alias]).inc();\n }\n\n // ── §13.6 Session pinning metrics ──\n\n pub fn set_session_active_count(&self, count: u64) {\n self.session_active_count.set(count as f64);\n }\n\n pub fn inc_session_pin_enforced(&self, strategy: &str) {\n self.session_pin_enforced_total.with_label_values(&[strategy]).inc();\n }\n\n pub fn observe_session_wait_duration(&self, duration_seconds: f64) {\n self.session_wait_duration_seconds.observe(duration_seconds);\n }\n\n pub fn inc_session_wait_timeout(&self, strategy: &str) {\n self.session_wait_timeout_total.with_label_values(&[strategy]).inc();\n }\n\n pub fn registry(&self) -> &Registry {\n &self.registry\n }\n}\n\n#[cfg(test)]\nmod tests {\n use super::*;\n\n #[test]\n fn test_request_id_generation() {\n // Generate multiple IDs to verify format\n for _ in 0..10 {\n let id = generate_request_id();\n\n // IDs should be 16 hex chars (64-bit hash)\n assert_eq!(id.len(), 16);\n\n // IDs should be hexadecimal\n assert!(id.chars().all(|c| c.is_ascii_hexdigit()));\n }\n\n // Test that different UUID prefixes produce different IDs\n let id1 = generate_request_id();\n std::thread::sleep(std::time::Duration::from_millis(5));\n let id2 = generate_request_id();\n // In production, time ensures uniqueness; test just verifies format above\n assert_eq!(id1.len(), 16);\n assert_eq!(id2.len(), 16);\n }\n\n #[test]\n fn test_metrics_creation() {\n // Default config has all §13 features enabled\n let metrics = Metrics::new(&MiroirConfig::default());\n\n // Add some sample data to ensure metrics show up in output\n metrics.request_duration.with_label_values(&[\"GET\", \"/test\", \"200\"]).observe(0.1);\n metrics.requests_total.with_label_values(&[\"GET\", \"/test\", \"200\"]).inc();\n metrics.requests_in_flight.inc();\n metrics.node_healthy.with_label_values(&[\"test-node\"]).set(1.0);\n metrics.node_request_duration.with_label_values(&[\"test-node\", \"search\"]).observe(0.05);\n metrics.node_errors.with_label_values(&[\"test-node\", \"timeout\"]).inc();\n metrics.shard_coverage.set(1.0);\n metrics.degraded_shards.set(0.0);\n metrics.shard_distribution.with_label_values(&[\"test-node\"]).set(32.0);\n metrics.task_processing_age.observe(0.1);\n metrics.tasks_total.with_label_values(&[\"completed\"]).inc();\n metrics.task_registry_size.set(5.0);\n metrics.scatter_fan_out_size.observe(3.0);\n metrics.scatter_partial_responses.inc();\n metrics.scatter_retries.inc();\n metrics.rebalance_in_progress.set(0.0);\n metrics.rebalance_documents_migrated.inc();\n metrics.rebalance_duration.observe(10.0);\n\n // Write to advanced Vec metrics so they appear in output\n metrics.inc_multisearch_tenant_session_pin_override(\"t1\");\n metrics.inc_vector_merge_strategy(\"convex\");\n metrics.inc_cdc_events_published(\"webhook\", \"idx1\");\n metrics.set_cdc_lag_seconds(\"webhook\", 0.5);\n metrics.set_cdc_buffer_bytes(\"webhook\", 1024.0);\n metrics.inc_cdc_dropped(\"webhook\");\n metrics.inc_cdc_events_suppressed(\"origin1\");\n metrics.inc_ttl_documents_expired(\"idx1\");\n metrics.observe_ttl_sweep_duration(\"idx1\", 0.1);\n metrics.set_ttl_pending_estimate(\"idx1\", 50.0);\n metrics.inc_tenant_queries(\"t1\", \"g1\");\n metrics.set_tenant_pinned_groups(\"t1\", 1);\n metrics.inc_tenant_fallback(\"no_group\");\n metrics.inc_shadow_diff(\"rank\");\n metrics.inc_shadow_errors(\"target1\", \"primary\");\n metrics.inc_rollover_events(\"policy1\");\n metrics.set_rollover_active_indexes(\"alias1\", 1.0);\n metrics.inc_rollover_documents_expired(\"policy1\");\n metrics.set_rollover_last_action_seconds(\"policy1\", 60.0);\n metrics.inc_canary_runs(\"canary1\", \"pass\");\n metrics.observe_canary_latency_ms(\"canary1\", 50.0);\n metrics.inc_canary_assertion_failures(\"canary1\", \"latency\");\n metrics.inc_admin_ui_action(\"login\");\n metrics.inc_admin_ui_destructive_action(\"delete_index\");\n metrics.inc_explain_warnings(\"slow_plan\");\n metrics.inc_search_ui_queries(\"idx1\");\n metrics.inc_search_ui_zero_hits(\"idx1\");\n metrics.inc_search_ui_click_through(\"idx1\");\n metrics.set_search_ui_p95_ms(\"idx1\", 150.0);\n\n // §14.9 Resource-pressure metrics\n metrics.set_memory_pressure(0);\n metrics.inc_cpu_throttled_seconds(1.5);\n metrics.set_request_queue_depth(42);\n metrics.set_background_queue_depth(\"rebalance\", 5);\n metrics.set_background_queue_depth(\"replication\", 3);\n metrics.set_peer_pod_count(3);\n metrics.set_leader(true);\n metrics.set_owned_shards_count(12);\n\n let encoded = metrics.encode_metrics();\n assert!(encoded.is_ok());\n\n let output = encoded.unwrap();\n\n // Verify all 18 core plan §10 metric names appear in the output\n let expected_metrics = [\n // Request metrics\n \"miroir_request_duration_seconds\",\n \"miroir_requests_total\",\n \"miroir_requests_in_flight\",\n // Node health metrics\n \"miroir_node_healthy\",\n \"miroir_node_request_duration_seconds\",\n \"miroir_node_errors_total\",\n // Shard metrics\n \"miroir_shard_coverage\",\n \"miroir_degraded_shards_total\",\n \"miroir_shard_distribution\",\n // Task metrics\n \"miroir_task_processing_age_seconds\",\n \"miroir_tasks_total\",\n \"miroir_task_registry_size\",\n // Scatter-gather metrics\n \"miroir_scatter_fan_out_size\",\n \"miroir_scatter_partial_responses_total\",\n \"miroir_scatter_retries_total\",\n // Rebalancer metrics\n \"miroir_rebalance_in_progress\",\n \"miroir_rebalance_documents_migrated_total\",\n \"miroir_rebalance_duration_seconds\",\n ];\n for name in &expected_metrics {\n assert!(output.contains(name), \"missing metric: {}\", name);\n }\n\n // With defaults (all §13 enabled), advanced metrics should be present\n let advanced_metrics = [\n // §13.11 Multi-search\n \"miroir_multisearch_queries_per_batch\",\n \"miroir_multisearch_batches_total\",\n \"miroir_multisearch_partial_failures_total\",\n \"miroir_tenant_session_pin_override_total\",\n // §13.12 Vector\n \"miroir_vector_search_over_fetched_total\",\n \"miroir_vector_merge_strategy\",\n \"miroir_vector_embedder_drift_total\",\n // §13.13 CDC\n \"miroir_cdc_events_published_total\",\n \"miroir_cdc_lag_seconds\",\n \"miroir_cdc_buffer_bytes\",\n \"miroir_cdc_dropped_total\",\n \"miroir_cdc_events_suppressed_total\",\n // §13.14 TTL\n \"miroir_ttl_documents_expired_total\",\n \"miroir_ttl_sweep_duration_seconds\",\n \"miroir_ttl_pending_estimate\",\n // §13.15 Tenant\n \"miroir_tenant_queries_total\",\n \"miroir_tenant_pinned_groups\",\n \"miroir_tenant_fallback_total\",\n // §13.16 Shadow\n \"miroir_shadow_diff_total\",\n \"miroir_shadow_kendall_tau\",\n \"miroir_shadow_latency_delta_seconds\",\n \"miroir_shadow_errors_total\",\n // §13.17 ILM\n \"miroir_rollover_events_total\",\n \"miroir_rollover_active_indexes\",\n \"miroir_rollover_documents_expired_total\",\n \"miroir_rollover_last_action_seconds\",\n // §13.18 Canary\n \"miroir_canary_runs_total\",\n \"miroir_canary_latency_ms\",\n \"miroir_canary_assertion_failures_total\",\n // §13.19 Admin UI\n \"miroir_admin_ui_sessions_total\",\n \"miroir_admin_ui_action_total\",\n \"miroir_admin_ui_destructive_action_total\",\n // §13.20 Explain\n \"miroir_explain_requests_total\",\n \"miroir_explain_warnings_total\",\n \"miroir_explain_execute_total\",\n // §13.21 Search UI\n \"miroir_search_ui_sessions_total\",\n \"miroir_search_ui_queries_total\",\n \"miroir_search_ui_zero_hits_total\",\n \"miroir_search_ui_click_through_total\",\n \"miroir_search_ui_p95_ms\",\n ];\n for name in &advanced_metrics {\n assert!(output.contains(name), \"missing advanced metric: {}\", name);\n }\n }\n\n #[test]\n fn test_metrics_feature_flags_off() {\n // Build a config with all §13.11-13.21 features disabled\n let mut config = MiroirConfig::default();\n config.multi_search.enabled = false;\n config.vector_search.enabled = false;\n config.cdc.enabled = false;\n config.ttl.enabled = false;\n config.tenant_affinity.enabled = false;\n config.shadow.enabled = false;\n config.ilm.enabled = false;\n config.canary_runner.enabled = false;\n config.admin_ui.enabled = false;\n config.explain.enabled = false;\n config.search_ui.enabled = false;\n\n let metrics = Metrics::new(&config);\n\n // Write to core Vec metrics so they appear in output\n metrics.request_duration.with_label_values(&[\"GET\", \"/test\", \"200\"]).observe(0.1);\n\n let encoded = metrics.encode_metrics().unwrap();\n\n // Core metrics should still be present\n assert!(encoded.contains(\"miroir_request_duration_seconds\"));\n assert!(encoded.contains(\"miroir_rebalance_duration_seconds\"));\n\n // Advanced metrics should NOT appear\n let advanced_names = [\n \"miroir_multisearch_queries_per_batch\",\n \"miroir_vector_search_over_fetched_total\",\n \"miroir_cdc_events_published_total\",\n \"miroir_ttl_documents_expired_total\",\n \"miroir_tenant_queries_total\",\n \"miroir_shadow_diff_total\",\n \"miroir_rollover_events_total\",\n \"miroir_canary_runs_total\",\n \"miroir_admin_ui_sessions_total\",\n \"miroir_explain_requests_total\",\n \"miroir_search_ui_sessions_total\",\n ];\n for name in &advanced_names {\n assert!(!encoded.contains(name), \"advanced metric should not appear when disabled: {}\", name);\n }\n }\n\n #[test]\n fn test_feature_gated_accessors_noop_when_disabled() {\n let mut config = MiroirConfig::default();\n config.multi_search.enabled = false;\n config.vector_search.enabled = false;\n config.cdc.enabled = false;\n config.ttl.enabled = false;\n config.tenant_affinity.enabled = false;\n config.shadow.enabled = false;\n config.ilm.enabled = false;\n config.canary_runner.enabled = false;\n config.admin_ui.enabled = false;\n config.explain.enabled = false;\n config.search_ui.enabled = false;\n\n let metrics = Metrics::new(&config);\n\n // All accessor methods should be safe to call (no-op)\n metrics.observe_multisearch_queries_per_batch(5);\n metrics.inc_multisearch_batches_total();\n metrics.inc_multisearch_partial_failures();\n metrics.inc_multisearch_tenant_session_pin_override(\"t1\");\n metrics.inc_vector_search_over_fetched();\n metrics.inc_vector_merge_strategy(\"convex\");\n metrics.inc_vector_embedder_drift();\n metrics.inc_cdc_events_published(\"webhook\", \"idx\");\n metrics.set_cdc_lag_seconds(\"webhook\", 1.5);\n metrics.set_cdc_buffer_bytes(\"webhook\", 1024.0);\n metrics.inc_cdc_dropped(\"webhook\");\n metrics.inc_cdc_events_suppressed(\"origin1\");\n metrics.inc_ttl_documents_expired(\"idx\");\n metrics.observe_ttl_sweep_duration(\"idx\", 0.1);\n metrics.set_ttl_pending_estimate(\"idx\", 50.0);\n metrics.inc_tenant_queries(\"t1\", \"0\");\n metrics.set_tenant_pinned_groups(\"t1\", 1);\n metrics.inc_tenant_fallback(\"no_group\");\n metrics.inc_shadow_diff(\"rank\");\n metrics.set_shadow_kendall_tau(0.95);\n metrics.observe_shadow_latency_delta(0.01);\n metrics.inc_shadow_errors(\"target1\", \"primary\");\n metrics.inc_rollover_events(\"policy1\");\n metrics.set_rollover_active_indexes(\"alias1\", 1.0);\n metrics.inc_rollover_documents_expired(\"policy1\");\n metrics.set_rollover_last_action_seconds(\"policy1\", 60.0);\n metrics.inc_canary_runs(\"canary1\", \"pass\");\n metrics.observe_canary_latency_ms(\"canary1\", 50.0);\n metrics.inc_canary_assertion_failures(\"canary1\", \"latency\");\n metrics.inc_admin_ui_sessions();\n metrics.inc_admin_ui_action(\"login\");\n metrics.inc_admin_ui_destructive_action(\"delete_index\");\n metrics.inc_explain_requests();\n metrics.inc_explain_warnings(\"slow_plan\");\n metrics.inc_explain_execute();\n metrics.inc_search_ui_sessions();\n metrics.inc_search_ui_queries(\"idx\");\n metrics.inc_search_ui_zero_hits(\"idx\");\n metrics.inc_search_ui_click_through(\"idx\");\n metrics.set_search_ui_p95_ms(\"idx\", 150.0);\n }\n\n #[test]\n fn test_header_request_id() {\n let mut headers = HeaderMap::new();\n assert!(headers.get_request_id().is_none());\n\n headers.set_request_id(\"test-id-123\");\n assert_eq!(headers.get_request_id(), Some(\"test-id-123\".to_string()));\n }\n\n // ---------------------------------------------------------------------------\n // RequestId type tests\n // ---------------------------------------------------------------------------\n\n #[test]\n fn test_request_id_format() {\n let id = RequestId::new();\n // RequestId should be exactly 8 hex characters\n assert_eq!(id.as_str().len(), 8);\n assert!(id.as_str().chars().all(|c| c.is_ascii_hexdigit()));\n }\n\n #[test]\n fn test_request_id_parse_valid() {\n // Valid 8-char hex string\n let valid = \"abcd1234\";\n let parsed = RequestId::parse(valid.to_string());\n assert!(parsed.is_some());\n assert_eq!(parsed.unwrap().as_str(), valid);\n }\n\n #[test]\n fn test_request_id_parse_invalid_wrong_length() {\n // Wrong length (too short)\n assert!(RequestId::parse(\"abc123\".to_string()).is_none());\n // Wrong length (too long)\n assert!(RequestId::parse(\"abcd12345678\".to_string()).is_none());\n }\n\n #[test]\n fn test_request_id_parse_invalid_non_hex() {\n // Contains non-hex characters\n assert!(RequestId::parse(\"abcd1234!\".to_string()).is_none());\n assert!(RequestId::parse(\"ghijklmn\".to_string()).is_none());\n }\n\n #[test]\n fn test_request_id_uniqueness() {\n // Generate two consecutive IDs - they should be different\n // due to UUIDv7's timestamp component\n let id1 = RequestId::new();\n std::thread::sleep(std::time::Duration::from_millis(5));\n let id2 = RequestId::new();\n\n assert_ne!(id1, id2);\n assert_ne!(id1.as_str(), id2.as_str());\n }\n\n // ---------------------------------------------------------------------------\n // Integration tests for request_id_middleware\n // ---------------------------------------------------------------------------\n\n #[tokio::test]\n async fn test_request_id_middleware_adds_header() {\n use axum::{routing::get, Router};\n use http_body_util::Full;\n use tower::ServiceExt;\n\n // Build a simple router with the request ID middleware\n let app = Router::new()\n .route(\"/test\", get(|| async { \"OK\" }))\n .layer(axum::middleware::from_fn(request_id_middleware));\n\n // Create a test request\n let request = Request::builder()\n .uri(\"/test\")\n .body(Full::default())\n .unwrap();\n\n // Send the request\n let response = app.oneshot(request).await.unwrap();\n\n // Verify X-Request-Id header is present\n let header = response\n .headers()\n .get(\"x-request-id\")\n .expect(\"X-Request-Id header should be present\");\n let header_value = header.to_str().unwrap();\n\n // Verify it's 8 hex characters\n assert_eq!(\n header_value.len(),\n 8,\n \"X-Request-Id should be 8 characters\"\n );\n assert!(\n header_value.chars().all(|c| c.is_ascii_hexdigit()),\n \"X-Request-Id should be hexadecimal\"\n );\n }\n\n #[tokio::test]\n async fn test_request_id_middleware_unique_per_request() {\n use axum::{routing::get, Router};\n use http_body_util::Full;\n use tower::ServiceExt;\n\n // Build a simple router with the request ID middleware\n let app = Router::new()\n .route(\"/test\", get(|| async { \"OK\" }))\n .layer(axum::middleware::from_fn(request_id_middleware));\n\n // Create two identical requests\n let request1 = Request::builder()\n .uri(\"/test\")\n .body(Full::default())\n .unwrap();\n\n let request2 = Request::builder()\n .uri(\"/test\")\n .body(Full::default())\n .unwrap();\n\n // Send both requests\n let response1 = app.clone().oneshot(request1).await.unwrap();\n let response2 = app.oneshot(request2).await.unwrap();\n\n // Extract headers\n let id1 = response1\n .headers()\n .get(\"x-request-id\")\n .unwrap()\n .to_str()\n .unwrap();\n let id2 = response2\n .headers()\n .get(\"x-request-id\")\n .unwrap()\n .to_str()\n .unwrap();\n\n // Verify IDs are different (UUIDv7 timestamp ensures this)\n assert_ne!(\n id1, id2,\n \"Two consecutive requests should have different request IDs\"\n );\n\n // Both should still be valid 8-char hex\n assert_eq!(id1.len(), 8);\n assert_eq!(id2.len(), 8);\n }\n\n #[tokio::test]\n async fn test_request_id_middleware_preserves_existing_header() {\n use axum::{routing::get, Router};\n use http_body_util::Full;\n use tower::ServiceExt;\n\n // Build a simple router with the request ID middleware\n let app = Router::new()\n .route(\"/test\", get(|| async { \"OK\" }))\n .layer(axum::middleware::from_fn(request_id_middleware));\n\n // Create a request with a pre-existing X-Request-Id header\n let existing_id = \"deadbeef\";\n let request = Request::builder()\n .uri(\"/test\")\n .header(\"x-request-id\", existing_id)\n .body(Full::default())\n .unwrap();\n\n // Send the request\n let response = app.oneshot(request).await.unwrap();\n\n // Verify the header is preserved\n let header = response\n .headers()\n .get(\"x-request-id\")\n .expect(\"X-Request-Id header should be present\");\n let header_value = header.to_str().unwrap();\n\n assert_eq!(\n header_value, existing_id,\n \"Existing X-Request-Id should be preserved\"\n );\n }\n}\n","numLines":2132,"startLine":1,"totalLines":2132}}} +{"type":"system","subtype":"status","status":"requesting","uuid":"c5e85779-3add-4daa-a447-7a100259fd9e","session_id":"9b1ab346-8bcf-48fe-9e09-304887755605"} 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The peer discovery refresh loop is already integrated in main.rs (lines 407-438). \n\nLooking at the code:\n1. The peer_discovery module exists with SRV lookup implementation\n2. The config has `peer_discovery` section with `service_name` and `refresh_interval_s`\n3. The main.rs already has the peer discovery refresh loop\n4. The Metrics struct already has the `set_peer_pod_count` method\n\nLet me check if there's anything missing. Looking at the peer_discovery.rs module, I see it uses `trust-dns-resolver` which is conditionally compiled with the `peer-discovery` feature. Let me verify the feature is properly set up.\n\nLet me also check if there are any tests or verification scripts that I should run.","signature":""}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":null,"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","uuid":"019b47c6-4b7f-4ffd-a6bc-4258d69568ec"} +{"type":"stream_event","event":{"type":"content_block_stop","index":0},"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","parent_tool_use_id":null,"uuid":"a1b5d01f-a224-40f1-a84a-55b3fa12e779"} +{"type":"stream_event","event":{"type":"content_block_start","index":1,"content_block":{"type":"text","text":""}},"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","parent_tool_use_id":null,"uuid":"154d29f5-5f0e-42c9-9c96-8996f58d5093"} 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Let me verify the feature flag and run tests to ensure everything works."}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":null,"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","uuid":"5ed35e8f-c33f-4586-91c5-b314d7598649"} +{"type":"stream_event","event":{"type":"content_block_stop","index":1},"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","parent_tool_use_id":null,"uuid":"b420a769-d9fa-47b4-b0cd-e620ffe0c6d1"} +{"type":"stream_event","event":{"type":"content_block_start","index":2,"content_block":{"type":"tool_use","id":"call_2f6da48dd8334ab6bf02b791","name":"Bash","input":{}}},"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","parent_tool_use_id":null,"uuid":"ee084393-a98e-4ca9-a03e-cdd7515dff12"} +{"type":"stream_event","event":{"type":"content_block_delta","index":2,"delta":{"type":"input_json_delta","partial_json":"{\"command\":\"cargo test --package miroir-core --lib peer_discovery 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crates/miroir-core/src/alias/acceptance_tests.rs:150:46\n |\n150 | use crate::task_store::{SqliteTaskStore, AliasHistoryEntry};\n | ^^^^^^^^^^^^^^^^^\n |\n = note: `#[warn(unused_imports)]` on by default\n\nwarning: unused import: `MiroirError`\n --> crates/miroir-core/src/anti_entropy.rs:7:20\n |\n7 | use crate::error::{MiroirError, Result};\n | ^^^^^^^^^^^\n\nwarning: unused import: `Group`\n --> crates/miroir-core/src/anti_entropy.rs:10:23\n |\n10 | use crate::topology::{Group, NodeId, Topology};\n | ^^^^^\n\nwarning: unused import: `std::collections::HashMap`\n --> crates/miroir-core/src/anti_entropy.rs:12:5\n |\n12 | use std::collections::HashMap;\n | ^^^^^^^^^^^^^^^^^^^^^^^^^\n\nwarning: unused imports: `AtomicUsize` and `Ordering`\n --> crates/miroir-core/src/cdc.rs:467:33\n |\n467 | use std::sync::atomic::{AtomicUsize, Ordering};\n | ^^^^^^^^^^^ ^^^^^^^^\n\nwarning: unused import: `crate::router::shard_for_key`\n --> crates/miroir-core/src/explainer.rs:7:5\n |\n7 | use crate::router::shard_for_key;\n | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n\nwarning: unused imports: `MiroirError` and `Result`\n --> crates/miroir-core/src/hedging.rs:6:20\n |\n6 | use crate::error::{MiroirError, Result};\n | ^^^^^^^^^^^ ^^^^^^\n\nwarning: unused imports: `Instant` and `sleep`\n --> crates/miroir-core/src/hedging.rs:14:19\n |\n14 | use tokio::time::{sleep, Instant};\n | ^^^^^ ^^^^^^^\n\nwarning: unused import: `std::future::Future`\n --> crates/miroir-core/src/multi_search.rs:10:5\n |\n10 | use std::future::Future;\n | ^^^^^^^^^^^^^^^^^^^\n\nwarning: unused import: `Instant`\n --> crates/miroir-core/src/rebalancer_worker/drift_reconciler.rs:16:27\n |\n16 | use std::time::{Duration, Instant};\n | ^^^^^^^\n\nwarning: unused import: `tokio::sync::RwLock`\n --> crates/miroir-core/src/rebalancer_worker/drift_reconciler.rs:17:5\n |\n17 | use tokio::sync::RwLock;\n | ^^^^^^^^^^^^^^^^^^^\n\nwarning: unused import: `std::sync::Arc`\n --> crates/miroir-core/src/rebalancer_worker/drift_reconciler.rs:394:9\n |\n394 | use std::sync::Arc;\n | ^^^^^^^^^^^^^^\n\nwarning: unused imports: `AdminSessionRow`, `CanaryRow`, `CdcCursorRow`, `NewAdminSession`, `NewCanary`, `NewCdcCursor`, `NewRolloverPolicy`, `NewSearchUiConfig`, `NewTenantMapping`, `RolloverPolicyRow`, `SearchUiConfigRow`, and `TenantMapRow`\n --> crates/miroir-core/src/rebalancer_worker/acceptance_tests.rs:11:68\n |\n11 | ...e, NewCanary, CanaryRow, NewCdcCursor, CdcCursorRow, NewTenantMapping, TenantMapRow, NewRolloverPolicy, RolloverPolicyRow, NewSearchUiConfig, SearchUiConfigRow, NewAdminSession, AdminSessionRow};\n | ^^^^^^^^^ ^^^^^^^^^ ^^^^^^^^^^^^ ^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^\n\nwarning: unused import: `tokio::sync::mpsc`\n --> crates/miroir-core/src/rebalancer_worker/acceptance_tests.rs:517:9\n |\n517 | use tokio::sync::mpsc;\n | ^^^^^^^^^^^^^^^^^\n\nwarning: unused import: `Ordering`\n --> crates/miroir-core/src/rebalancer_worker/acceptance_tests.rs:518:40\n |\n518 | use std::sync::atomic::{AtomicU32, Ordering};\n | ^^^^^^^^\n\nwarning: unused import: `tokio::sync::RwLock`\n --> crates/miroir-core/src/rebalancer_worker/settings_broadcast_acceptance_tests.rs:31:5\n |\n31 | use tokio::sync::RwLock;\n | ^^^^^^^^^^^^^^^^^^^\n\nwarning: unused import: `crate::config::MiroirConfig`\n --> crates/miroir-core/src/rebalancer_worker/mod.rs:1584:9","is_error":false}]},"parent_tool_use_id":null,"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","uuid":"4f412787-cfe1-48f1-bf60-f6ad618c2f69","timestamp":"2026-05-23T06:49:38.225Z","tool_use_result":{"stdout":"warning: unused import: `AliasHistoryEntry`\n --> crates/miroir-core/src/alias/acceptance_tests.rs:150:46\n |\n150 | use crate::task_store::{SqliteTaskStore, AliasHistoryEntry};\n | ^^^^^^^^^^^^^^^^^\n |\n = note: `#[warn(unused_imports)]` on by default\n\nwarning: unused import: `MiroirError`\n --> crates/miroir-core/src/anti_entropy.rs:7:20\n |\n7 | use crate::error::{MiroirError, Result};\n | ^^^^^^^^^^^\n\nwarning: unused import: `Group`\n --> crates/miroir-core/src/anti_entropy.rs:10:23\n |\n10 | use crate::topology::{Group, NodeId, Topology};\n | ^^^^^\n\nwarning: unused import: `std::collections::HashMap`\n --> crates/miroir-core/src/anti_entropy.rs:12:5\n |\n12 | use std::collections::HashMap;\n | ^^^^^^^^^^^^^^^^^^^^^^^^^\n\nwarning: unused imports: `AtomicUsize` and `Ordering`\n --> crates/miroir-core/src/cdc.rs:467:33\n |\n467 | use std::sync::atomic::{AtomicUsize, Ordering};\n | ^^^^^^^^^^^ ^^^^^^^^\n\nwarning: unused import: `crate::router::shard_for_key`\n --> crates/miroir-core/src/explainer.rs:7:5\n |\n7 | use crate::router::shard_for_key;\n | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n\nwarning: unused imports: `MiroirError` and `Result`\n --> crates/miroir-core/src/hedging.rs:6:20\n |\n6 | use crate::error::{MiroirError, Result};\n | ^^^^^^^^^^^ ^^^^^^\n\nwarning: unused imports: `Instant` and `sleep`\n --> crates/miroir-core/src/hedging.rs:14:19\n |\n14 | use tokio::time::{sleep, Instant};\n | ^^^^^ ^^^^^^^\n\nwarning: unused import: `std::future::Future`\n --> crates/miroir-core/src/multi_search.rs:10:5\n |\n10 | use std::future::Future;\n | ^^^^^^^^^^^^^^^^^^^\n\nwarning: unused import: `Instant`\n --> crates/miroir-core/src/rebalancer_worker/drift_reconciler.rs:16:27\n |\n16 | use std::time::{Duration, Instant};\n | ^^^^^^^\n\nwarning: unused import: `tokio::sync::RwLock`\n --> crates/miroir-core/src/rebalancer_worker/drift_reconciler.rs:17:5\n |\n17 | use tokio::sync::RwLock;\n | ^^^^^^^^^^^^^^^^^^^\n\nwarning: unused import: `std::sync::Arc`\n --> crates/miroir-core/src/rebalancer_worker/drift_reconciler.rs:394:9\n |\n394 | use std::sync::Arc;\n | ^^^^^^^^^^^^^^\n\nwarning: unused imports: `AdminSessionRow`, `CanaryRow`, `CdcCursorRow`, `NewAdminSession`, `NewCanary`, `NewCdcCursor`, `NewRolloverPolicy`, `NewSearchUiConfig`, `NewTenantMapping`, `RolloverPolicyRow`, `SearchUiConfigRow`, and `TenantMapRow`\n --> crates/miroir-core/src/rebalancer_worker/acceptance_tests.rs:11:68\n |\n11 | ...e, NewCanary, CanaryRow, NewCdcCursor, CdcCursorRow, NewTenantMapping, TenantMapRow, NewRolloverPolicy, RolloverPolicyRow, NewSearchUiConfig, SearchUiConfigRow, NewAdminSession, AdminSessionRow};\n | ^^^^^^^^^ ^^^^^^^^^ ^^^^^^^^^^^^ ^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^\n\nwarning: unused import: `tokio::sync::mpsc`\n --> crates/miroir-core/src/rebalancer_worker/acceptance_tests.rs:517:9\n |\n517 | use tokio::sync::mpsc;\n | ^^^^^^^^^^^^^^^^^\n\nwarning: unused import: `Ordering`\n --> crates/miroir-core/src/rebalancer_worker/acceptance_tests.rs:518:40\n |\n518 | use std::sync::atomic::{AtomicU32, Ordering};\n | ^^^^^^^^\n\nwarning: unused import: `tokio::sync::RwLock`\n --> crates/miroir-core/src/rebalancer_worker/settings_broadcast_acceptance_tests.rs:31:5\n |\n31 | use tokio::sync::RwLock;\n | ^^^^^^^^^^^^^^^^^^^\n\nwarning: unused import: `crate::config::MiroirConfig`\n --> crates/miroir-core/src/rebalancer_worker/mod.rs:1584:9","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false}} +{"type":"system","subtype":"status","status":"requesting","uuid":"f51820e5-153e-4e16-98b3-faa193cf56ee","session_id":"9b1ab346-8bcf-48fe-9e09-304887755605"} +{"type":"stream_event","event":{"type":"message_start","message":{"id":"msg_20260523144940d6c96301ce824e70","type":"message","role":"assistant","model":"glm-4.7","content":[],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0}}},"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","parent_tool_use_id":null,"uuid":"e632c1ad-dc91-4b3a-a2bd-68909e5950a4","ttft_ms":2473} 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Let me check if there are specific peer discovery tests and run them with the peer-discovery feature enabled.","signature":""}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":null,"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","uuid":"2a4959cc-cd7b-4609-ba54-84a0eb7dc0fb"} +{"type":"stream_event","event":{"type":"content_block_stop","index":0},"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","parent_tool_use_id":null,"uuid":"e6a0da40-06e1-4dc2-b954-0c5bb39291cc"} +{"type":"stream_event","event":{"type":"content_block_start","index":1,"content_block":{"type":"tool_use","id":"call_ef25622311f440ec8eba300a","name":"Bash","input":{}}},"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","parent_tool_use_id":null,"uuid":"ff0c6ab7-19e3-46e8-bf7c-b1bb0eeb3ea4"} 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struct DriftReconciler {\n | --------------- field in this struct\n49 | config: DriftReconcilerConfig,\n50 | settings_broadcast: Arc,\n | ^^^^^^^^^^^^^^^^^^\n\nwarning: field `topology` is never read\n --> crates/miroir-core/src/task_registry.rs:38:5\n |\n36 | pub struct ClientNodePoller {\n | ---------------- field in this struct\n37 | client: Arc,\n38 | topology: Arc,\n | ^^^^^^^^\n\nwarning: structure field `indexUid` should have a snake case name\n --> crates/miroir-core/src/multi_search.rs:26:9\n |\n26 | pub indexUid: String,\n | ^^^^^^^^ help: convert the identifier to snake case: `index_uid`\n |\n = note: `#[warn(non_snake_case)]` on by default\n\nwarning: `miroir-core` (lib test) generated 61 warnings (run `cargo fix --lib -p miroir-core --tests` to apply 24 suggestions)\n Finished `test` profile [unoptimized + debuginfo] target(s) in 0.14s\n Running unittests src/lib.rs (target/debug/deps/miroir_core-e09ad63f21c817a7)\n\nrunning 3 tests\ntest peer_discovery::tests::test_peer_set_empty ... ok\ntest peer_discovery::tests::test_peer_set_with_peers ... ok\ntest peer_discovery::tests::test_srv_target_pod_name_extraction ... ok\n\ntest result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 392 filtered out; finished in 0.00s","is_error":false}]},"parent_tool_use_id":null,"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","uuid":"3407d5ac-e51f-45e1-9fe8-0abfe0a12f56","timestamp":"2026-05-23T06:49:43.199Z","tool_use_result":{"stdout":"...\n1290 | async fn start_dual_write_for_shard(&self, _replica_group: u32, shard_id: u32) -> Result<(), String> {\n | ^^^^^^^^^^^^^^^^^^^^^^^^^^\n...\n1362 | async fn start_background_migration_for_shard(&self, shard_id: u32) -> Result<(), String> {\n | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n\nwarning: function `old_node_owners_for_shard` is never used\n --> crates/miroir-core/src/rebalancer_worker/mod.rs:1575:4\n |\n1575 | fn old_node_owners_for_shard(old_owners: &HashMap, shard_id: u32) -> MigrationNodeId {\n | ^^^^^^^^^^^^^^^^^^^^^^^^^\n\nwarning: field `settings_broadcast` is never read\n --> crates/miroir-core/src/rebalancer_worker/drift_reconciler.rs:50:5\n |\n48 | pub struct DriftReconciler {\n | --------------- field in this struct\n49 | config: DriftReconcilerConfig,\n50 | settings_broadcast: Arc,\n | ^^^^^^^^^^^^^^^^^^\n\nwarning: field `topology` is never read\n --> crates/miroir-core/src/task_registry.rs:38:5\n |\n36 | pub struct ClientNodePoller {\n | ---------------- field in this struct\n37 | client: Arc,\n38 | topology: Arc,\n | ^^^^^^^^\n\nwarning: structure field `indexUid` should have a snake case name\n --> crates/miroir-core/src/multi_search.rs:26:9\n |\n26 | pub indexUid: String,\n | ^^^^^^^^ help: convert the identifier to snake case: `index_uid`\n |\n = note: `#[warn(non_snake_case)]` on by default\n\nwarning: `miroir-core` (lib test) generated 61 warnings (run `cargo fix --lib -p miroir-core --tests` to apply 24 suggestions)\n Finished `test` 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Checking miroir_peer_pod_count metric exists...\"\n15\tMETRICS=$(curl -s \"${METRICS_URL}/metrics\" 2>/dev/null || echo \"\")\n16\tif [ -z \"$METRICS\" ]; then\n17\t echo \" ❌ FAILED: Could not connect to ${METRICS_URL}/metrics\"\n18\t exit 1\n19\tfi\n20\t\n21\tif echo \"$METRICS\" | grep -q \"^miroir_peer_pod_count\"; then\n22\t echo \" ✓ miroir_peer_pod_count metric exists\"\n23\telse\n24\t echo \" ❌ FAILED: miroir_peer_pod_count metric not found\"\n25\t exit 1\n26\tfi\n27\t\n28\techo \"\"\n29\techo \"2. Checking miroir_leader metric exists...\"\n30\tif echo \"$METRICS\" | grep -q \"^miroir_leader\"; then\n31\t echo \" ✓ miroir_leader metric exists\"\n32\telse\n33\t echo \" ❌ FAILED: miroir_leader metric not found\"\n34\t exit 1\n35\tfi\n36\t\n37\techo \"\"\n38\techo \"3. Checking miroir_owned_shards_count metric exists...\"\n39\tif echo \"$METRICS\" | grep -q \"^miroir_owned_shards_count\"; then\n40\t echo \" ✓ miroir_owned_shards_count metric exists\"\n41\telse\n42\t echo \" ❌ FAILED: miroir_owned_shards_count metric not found\"\n43\t exit 1\n44\tfi\n45\t\n46\techo \"\"\n47\techo \"4. Verifying POD_NAME env var is set (if running in K8s)...\"\n48\tPOD_NAME=\"${POD_NAME:-unknown}\"\n49\tif [ \"$POD_NAME\" != \"unknown\" ]; then\n50\t echo \" ✓ POD_NAME=$POD_NAME\"\n51\telse\n52\t echo \" ⚠ POD_NAME not set (not running in Kubernetes)\"\n53\tfi\n54\t\n55\techo \"\"\n56\techo \"5. Verifying POD_NAMESPACE env var is set (if running in K8s)...\"\n57\tPOD_NAMESPACE=\"${POD_NAMESPACE:-unknown}\"\n58\tif [ \"$POD_NAMESPACE\" != \"unknown\" ]; then\n59\t echo \" ✓ POD_NAMESPACE=$POD_NAMESPACE\"\n60\telse\n61\t echo \" ⚠ POD_NAMESPACE not set (not running in Kubernetes)\"\n62\tfi\n63\t\n64\techo \"\"\n65\techo \"6. Verifying POD_IP env var is set (if running in K8s)...\"\n66\tPOD_IP=\"${POD_IP:-unknown}\"\n67\tif [ \"$POD_IP\" != \"unknown\" ]; then\n68\t echo \" ✓ POD_IP=$POD_IP\"\n69\telse\n70\t echo \" ⚠ POD_IP not set (not running in Kubernetes)\"\n71\tfi\n72\t\n73\techo \"\"\n74\techo \"7. Checking peer_discovery configuration...\"\n75\t# The peer_discovery config is internal, but we can check the log for the refresh loop starting\n76\t# For local dev, peer discovery may be disabled if POD_NAME=unknown\n77\tif [ \"$POD_NAME\" = \"unknown\" ]; then\n78\t echo \" ℹ peer discovery disabled (not running in Kubernetes)\"\n79\telse\n80\t echo \" ✓ peer discovery should be enabled (POD_NAME is set)\"\n81\tfi\n82\t\n83\techo \"\"\n84\techo \"=== P6.2 Peer Discovery Verification Complete ✓ ===\"\n85\t"}]},"parent_tool_use_id":null,"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","uuid":"5040b993-906a-446d-9655-6e0a4cb624e6","timestamp":"2026-05-23T06:49:58.935Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/tests/verify_p6_2_peer_discovery.sh","content":"#!/usr/bin/env bash\n# Verification script for P6.2 Peer Discovery\n# Tests that peer discovery is properly configured and the miroir_peer_pod_count metric exists\n\nset -e\n\nADMIN_KEY=\"${MIROIR_ADMIN_API_KEY:-admin123}\"\nBASE_URL=\"${MIROIR_BASE_URL:-http://localhost:7700}\"\nMETRICS_URL=\"${MIROIR_METRICS_URL:-http://localhost:9090}\"\n\necho \"=== P6.2 Peer Discovery Verification ===\"\necho \"\"\n\necho \"1. Checking miroir_peer_pod_count metric exists...\"\nMETRICS=$(curl -s \"${METRICS_URL}/metrics\" 2>/dev/null || echo \"\")\nif [ -z \"$METRICS\" ]; then\n echo \" ❌ FAILED: Could not connect to ${METRICS_URL}/metrics\"\n exit 1\nfi\n\nif echo \"$METRICS\" | grep -q \"^miroir_peer_pod_count\"; then\n echo \" ✓ miroir_peer_pod_count metric exists\"\nelse\n echo \" ❌ FAILED: miroir_peer_pod_count metric not found\"\n exit 1\nfi\n\necho \"\"\necho \"2. Checking miroir_leader metric exists...\"\nif echo \"$METRICS\" | grep -q \"^miroir_leader\"; then\n echo \" ✓ miroir_leader metric exists\"\nelse\n echo \" ❌ FAILED: miroir_leader metric not found\"\n exit 1\nfi\n\necho \"\"\necho \"3. Checking miroir_owned_shards_count metric exists...\"\nif echo \"$METRICS\" | grep -q \"^miroir_owned_shards_count\"; then\n echo \" ✓ miroir_owned_shards_count metric exists\"\nelse\n echo \" ❌ FAILED: miroir_owned_shards_count metric not found\"\n exit 1\nfi\n\necho \"\"\necho \"4. 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Checking peer_discovery configuration...\"\n# The peer_discovery config is internal, but we can check the log for the refresh loop starting\n# For local dev, peer discovery may be disabled if POD_NAME=unknown\nif [ \"$POD_NAME\" = \"unknown\" ]; then\n echo \" ℹ peer discovery disabled (not running in Kubernetes)\"\nelse\n echo \" ✓ peer discovery should be enabled (POD_NAME is set)\"\nfi\n\necho \"\"\necho \"=== P6.2 Peer Discovery Verification Complete ✓ ===\"\n","numLines":85,"startLine":1,"totalLines":85}}} +{"type":"system","subtype":"status","status":"requesting","uuid":"cadc5ed2-cfd5-4802-b806-67aecefc388d","session_id":"9b1ab346-8bcf-48fe-9e09-304887755605"} 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Full output saved to: /home/coding/.claude/projects/-home-coding-miroir/9b1ab346-8bcf-48fe-9e09-304887755605/tool-results/call_5560f3b5a29148a69311a4e1.txt\n\nPreview (first 2KB):\ndocs/plan/plan.md-3187- **Scoped-key rotation coordination.** Rotation is a multi-pod handoff that must never revoke the old key while any peer is still serving requests against it. Coordination uses three pieces of shared state:\ndocs/plan/plan.md-3188- - **Shared-key record.** A Redis hash at `miroir:search_ui_scoped_key:` with fields `{primary_uid, previous_uid, rotated_at, generation}`. On every inbound SPA request, the pod substitutes `primary_uid` as the Meilisearch authorization when forwarding; it additionally accepts `previous_uid` as a valid fallback during the overlap window (in case a just-restarted pod still references the old UID it read a moment earlier). `generation` is a monotonic counter bumped on each rotation.\ndocs/plan/plan.md-3189- - **Leader lease.** Rotation is driven by a single leader holding the `search_ui_key_rotation:` lease (Mode B, §14.5). Only the leader mints the new scoped key, updates the hash, and later revokes `previous_uid`.\ndocs/plan/plan.md-3190- - **Per-pod observation beacon.** Each pod writes `miroir:search_ui_scoped_key_observed:: = {generation, observed_at}` with 60 s TTL, refreshed on every use of the scoped key. This gives the leader a reliable \"who has seen what\" view of the fleet.\n/home/coding/miroir/docs/plan/plan.md-3191-\ndocs/plan/plan.md:3192:[Omitted long matching line]\n/home/coding/miroir/docs/plan/plan.md-3193-\n/home/coding/miroir/docs/plan/plan.md-3194-[Omitted long context line]\n/home/coding/miroir/docs/plan/plan.md-3195-\n/home/coding/miroir/docs/plan/plan.md-3196-[Omitted long context line]\n/home/coding/miroir/docs/plan/plan.md-3197-[Omitted long context line]\n/home/coding/miroir/docs/plan/plan.md-3198-\n...\n"}]},"parent_tool_use_id":null,"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","uuid":"3d6e59f1-4241-46b1-a40b-5a5d72482f19","timestamp":"2026-05-23T06:50:11.618Z","tool_use_result":{"mode":"content","numFiles":0,"filenames":[],"content":"docs/plan/plan.md-3187- **Scoped-key rotation coordination.** Rotation is a multi-pod handoff that must never revoke the old key while any peer is still serving requests against it. Coordination uses three pieces of shared state:\ndocs/plan/plan.md-3188- - **Shared-key record.** A Redis hash at `miroir:search_ui_scoped_key:` with fields `{primary_uid, previous_uid, rotated_at, generation}`. On every inbound SPA request, the pod substitutes `primary_uid` as the Meilisearch authorization when forwarding; it additionally accepts `previous_uid` as a valid fallback during the overlap window (in case a just-restarted pod still references the old UID it read a moment earlier). `generation` is a monotonic counter bumped on each rotation.\ndocs/plan/plan.md-3189- - **Leader lease.** Rotation is driven by a single leader holding the `search_ui_key_rotation:` lease (Mode B, §14.5). Only the leader mints the new scoped key, updates the hash, and later revokes `previous_uid`.\ndocs/plan/plan.md-3190- - **Per-pod observation beacon.** Each pod writes `miroir:search_ui_scoped_key_observed:: = {generation, observed_at}` with 60 s TTL, refreshed on every use of the scoped key. This gives the leader a reliable \"who has seen what\" view of the fleet.\n/home/coding/miroir/docs/plan/plan.md-3191-\ndocs/plan/plan.md:3192:[Omitted long matching line]\n/home/coding/miroir/docs/plan/plan.md-3193-\n/home/coding/miroir/docs/plan/plan.md-3194-[Omitted long context line]\n/home/coding/miroir/docs/plan/plan.md-3195-\n/home/coding/miroir/docs/plan/plan.md-3196-[Omitted long context line]\n/home/coding/miroir/docs/plan/plan.md-3197-[Omitted long context line]\n/home/coding/miroir/docs/plan/plan.md-3198-\ndocs/plan/plan.md-3199- **Scope and index claims (defense-in-depth).** JWT claims include `scope: [\"search\", \"multi_search\", \"beacon\"]` (array of allowed action names) and `idx: ` (the single index this session is bound to). The orchestrator validates on every request **before any node call**: the (method + path) must match an allowed action in `scope`, and the target index must equal `idx`. The mapping from (method, path) to action names is:\n/home/coding/miroir/docs/plan/plan.md-3200- - `POST /indexes/{idx}/search` → `search`\n/home/coding/miroir/docs/plan/plan.md-3201- - `POST /multi-search` → `multi_search` (every sub-query's `indexUid` must equal `idx`)\n/home/coding/miroir/docs/plan/plan.md-3202- - `POST /_miroir/ui/search/{idx}/beacon` → `beacon`\n/home/coding/miroir/docs/plan/plan.md-3203-\ndocs/plan/plan.md-3204- Any other combination returns `miroir_jwt_scope_denied` (HTTP 403). This is a belt-and-braces check on top of the scoped Meilisearch key's own `actions: [\"search\"]` restriction: the orchestrator rejects disallowed combinations before the node sees the request, which matters for endpoints Meilisearch itself does not gate (e.g. the Miroir-side `beacon` endpoint).\n/home/coding/miroir/docs/plan/plan.md-3205-\ndocs/plan/plan.md-3206- **JWT claim shape:**\n/home/coding/miroir/docs/plan/plan.md-3207- ```json\n/home/coding/miroir/docs/plan/plan.md-3208- {\ndocs/plan/plan.md-3209- \"iss\": \"miroir\",\ndocs/plan/plan.md-3210- \"sub\": \"search-ui-session\",\ndocs/plan/plan.md-3211- \"idx\": \"products\",\ndocs/plan/plan.md-3212- \"scope\": [\"search\", \"multi_search\", \"beacon\"],\n--\n/home/coding/miroir/.beads/issues.jsonl-16-[Omitted long context line]\n/home/coding/miroir/.beads/issues.jsonl-17-[Omitted long context line]\n/home/coding/miroir/.beads/issues.jsonl-18-[Omitted long context line]\n/home/coding/miroir/.beads/issues.jsonl-19-[Omitted long 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never duplicated across pods. Three coordination modes cover all background tasks:\n3513\t\n3514\t**Mode A — Shard-partitioned ownership (parallel by shard).**\n3515\t\n3516\tEach pod owns a subset of shards for background processing. Assignment uses rendezvous hashing over the current peer set:\n3517\t\n3518\t```\n3519\tpeers = discover_peers() // headless-Service DNS lookup\n3520\towns(s, p) = p == top1_by_score(hash(s || pid) for pid in peers)\n3521\t```\n3522\t\n3523\tApplies to:\n3524\t- Anti-entropy reconciler (§13.8) — each pod fingerprints and repairs the shards it owns\n3525\t- Settings drift check (§13.5) — each pod polls a subset of (index, node) settings-hash pairs\n3526\t- Task registry pruner — each pod prunes tasks where it wins the rendezvous score for the task's `miroir_id`: `top1_by_score(hash(miroir_id || pid) for pid in peers) == self_pid`. Matches anti-entropy / drift-check partitioning; minimal reshuffling on scale events.\n3527\t\n3528\tWhen the peer set changes (scale event, pod restart), rendezvous redistributes ownership with minimal reshuffling. No explicit handoff — the new owner runs the next scheduled pass. Transient double-work during a 15-second discovery window is harmless: anti-entropy is idempotent, settings-repair is idempotent.\n3529\t\n3530\t**Mode B — Leader-only (singleton coordinator).**\n3531\t\n3532\tExactly one pod holds the leader lease at a time, backed by a lease row in the task store (Redis `SET NX EX 10` renewed every 3s; SQLite advisory lock for single-replica deployments). The leader runs operations that must be singleton or atomic:\n3533\t\n3534\t- Reshard coordinator (§13.1) — one reshard per index at a time; cutover is atomic\n3535\t- Rebalancer (existing Section 4) — already uses advisory lock\n3536\t- Alias flip serializer (§13.7) — atomic per alias\n3537\t- Two-phase settings broadcast (§13.5) — one settings change in flight per index\n3538\t\n3539\tLeader loss mid-operation causes a pause; the new leader reads the persisted phase state from the task store and resumes from the last committed phase. All operations are idempotent by design and safe to resume at any phase boundary.\n3540\t\n3541\t**Mode C — Work-queued (streaming jobs that outgrow a single pod).**\n3542\t\n3543\tHeavy streaming operations — large dump imports (§13.9), large reshard backfills (§13.1) — can exceed a single pod's envelope. They are submitted as **jobs** to a queue in the task store; any pod claims a job with lease-based ownership:\n3544\t\n3545\t```\n3546\tjob = {\n3547\t id: uuid,\n3548\t type: \"dump_import\" | \"reshard_backfill\",\n3549\t params: { ... },\n3550\t state: \"queued\" | \"in_progress\" | \"completed\" | \"failed\",\n3551\t claimed_by: pod_id | null,\n3552\t claim_expires_at: ts, // heartbeat every 10s, timeout 30s\n3553\t progress: { bytes_processed, docs_routed, last_cursor, ... },\n3554\t}\n3555\t```\n3556\t\n3557\tA large dump import is **split into chunks** on NDJSON line boundaries by the first pod that picks it up; chunks are re-enqueued as independent jobs. Each chunk is bounded by `dump_import.chunk_size_bytes` (default 256 MiB) so one chunk fits a pod's buffer. HPA reacts to queue depth: if `miroir_background_queue_depth > 0` and pods are at capacity, add pods; once queue drains, scale back down.\n3558\t\n3559\tReshard backfill partitions by shard-id range and uses the same chunked-job mechanism. Progress cursors are persisted per chunk so a crashed claim resumes at the last committed offset (idempotent via primary keys).\n3560\t\n3561\t**Peer discovery.** All three modes rely on the current peer set. Mechanism:\n3562\t\n3563\t- Kubernetes Downward API injects `POD_NAME` and `POD_IP` as env vars\n3564\t- A headless Service (`miroir-headless`) with label selector on the Deployment exposes pod IPs via DNS SRV records\n3565\t- Each pod refreshes its peer set every 15s via SRV lookup\n3566\t- No external service registry required; no Kubernetes API calls from the pod\n3567\t\n3568\t### 14.6 Per-feature scaling behavior\n3569\t\n3570\t| Capability | Scaling mode | Notes |\n3571\t|------------|-------------|-------|\n3572\t| §13.1 Online resharding | B (leader) + C (backfill queue) | Leader owns phase state machine; any pod consumes backfill chunks. Bounded-memory backfill via paginated `filter=_miroir_shard={id}`. |\n3573\t| §13.2 Hedged requests | stateless per-request | No coordination needed — each pod hedges its own requests. |\n3574\t| §13.3 Adaptive replica selection | per-pod EWMA | Each pod's scores are local; pods converge independently. Slight divergence is harmless. |\n3575\t| §13.4 Shard-aware query planner | per-request | Pure function of filter. Plan cache is per-pod. |\n3576\t| §13.5 Two-phase settings broadcast | B (leader) | Leader issues PATCH and verifies. Drift reconciler runs in mode A. |\n3577\t| §13.6 Session pinning | shared-state per-pod cache | Session row lives in task store (Redis); per-pod LRU caches it. Any pod can serve a session. |\n3578\t| §13.7 Atomic index aliases | shared state | Alias table in task store. All pods read same table with short TTL cache. |\n3579\t| §13.8 Anti-entropy reconciler | A (shard-partitioned) | Each pod fingerprints its owned shards. Naturally horizontal. |\n3580\t| §13.9 Streaming dump import | C (chunked jobs) | 500 GB dump → chunks → pods consume from queue; HPA scales on queue depth. |\n3581\t| §13.10 Idempotency + coalescing | per-pod + shared fallback | Idempotency cache per-pod with task-store lookup on miss — a retry on a different pod still dedups. Coalescing is per-pod only (acceptable: identical concurrent queries hitting different pods each issue their own scatter, which is rare and bounded by pod count). |\n3582\t| §13.11 Multi-search | stateless per-request | Sub-queries fan out using existing scatter infrastructure; each sub-query is independently routed. |\n3583\t| §13.12 Vector / hybrid search | stateless per-request | Merger uses more memory per request (see §14.2 vector over-fetch scratch row); no cross-pod coordination. |\n3584\t| §13.13 CDC publisher | per-pod publishers with shared cursors | `cdc_cursors` in the task store serialize cursor advancement via compare-and-swap; each pod publishes its own shard of events. Overflow buffer in Redis is shared across pods. |\n3585\t| §13.14 TTL sweeper | A (shard-partitioned) | Each pod sweeps only its rendezvous-owned shards; no duplicate deletes across pods. |\n3586\t| §13.15 Tenant affinity | stateless per-request | Hash-or-explicit routing decision; no shared state on the hot path (tenant map LRU is per-pod). |\n3587\t| §13.16 Shadow tee | stateless per-request | Each pod independently decides (per its local `sample_rate` RNG) whether to shadow a given request. |\n3588\t| §13.17 ILM rollover | B (leader-only) | Serialized alias flips + index create/delete; exactly one pod runs the daily policy evaluator at a time. |\n3589\t| §13.18 Canary runner | A (shard-partitioned) | Each canary ID is rendezvous-owned by exactly one pod per interval; no duplicate canary runs. |\n3590\t| §13.19 Admin UI | per-pod | Any pod serves the SPA; stateful sections read the shared task store. |\n3591\t| §13.20 Explain API | stateless per-request | Pure function of request + topology + config; no cross-pod coordination. |\n3592\t| §13.21 Search UI | per-pod (SPA + static assets); rate limiter needs shared state | Any pod serves the SPA. **Rate-limiter requirement:** multi-pod deployments MUST set `search_ui.rate_limit.backend: redis` — `values.schema.json` rejects `backend: local` when `miroir.replicas > 1`. With `backend: local`, the effective cluster-wide rate is `per_ip × pod_count` because each pod counts independently. Redis rate-limit bucket memory sized at ~20 MB per 10k active IPs (§14.7). |\n3593\t\n3594\t**Note.** TTL sweeper (§13.14), CDC publisher (§13.13), and canary runner (§13.18) are all Mode-A partitioned across pods; each pod consumes only its share of the workload, so the §14.2 memory rows for these features scale with `1/pod_count`.\n3595\t\n3596\t### 14.7 Revised deployment sizing matrix\n3597\t\n3598\tEach row gives the orchestrator pod count (2 vCPU / 3.75 GB each) for the stated workload. Meilisearch node sizing follows Section 6 independently.\n3599\t\n3600\t| Corpus | Peak QPS | Orchestrator pods | Task store |\n3601\t|--------|----------|-------------------|------------|\n3602\t| ≤ 10 GB | ≤ 500 | 2 (HA) | Redis (or SQLite if replicas=1) |\n3603\t| ≤ 50 GB | ≤ 2 k | 2–4 (HPA) | Redis |\n3604\t| ≤ 200 GB | ≤ 5 k | 4–8 (HPA) | Redis |\n3605\t| ≤ 1 TB | ≤ 20 k | 8–12 (HPA) | Redis |\n3606\t| ≤ 5 TB | ≤ 100 k | 12–24 (HPA) | Redis (clustered or Sentinel) |\n3607\t\n3608\tOrchestrator count scales with query throughput; Meilisearch node count scales with corpus size and RG/RF. They are orthogonal.\n3609\t\n3610\t**Task-store / Redis memory accounting.** When Redis is the task store, it also backs shared state for idempotency replay keys, session pinning rows, alias cache, background job queue, leader lease, CDC overflow buffer (when configured), and — new in §13.21 — search UI rate-limit buckets. Add **~20 MB for search UI rate-limit buckets at 10k active IPs** on top of the task-store baseline when `search_ui.rate_limit.backend: redis`. Bucket rows auto-expire per `redis_ttl_s` so the footprint stays bounded under IP-scan/spray attacks.\n3611\t\n3612\t### 14.8 Resource-aware configuration defaults\n3613\t\n3614\tEvery resource-sensitive knob has a default sized for the 2 vCPU / 3.75 GB envelope:\n3615\t\n3616\t```yaml\n3617\tmiroir:\n3618\t server:\n3619\t max_body_bytes: 104857600 # 100 MiB per request\n3620\t max_concurrent_requests: 500\n3621\t request_timeout_ms: 30000\n3622\t\n3623\t connection_pool_per_node:\n3624\t max_idle: 32\n3625\t max_total: 128\n3626\t idle_timeout_s: 60\n3627\t\n3628\t task_registry:\n3629\t cache_size: 10000\n3630\t redis_pool_max: 50\n3631\t\n3632\t idempotency:\n3633\t max_cached_keys: 1000000 # ~100 MB\n3634\t ttl_seconds: 86400\n3635\t\n3636\t session_pinning:\n3637\t max_sessions: 100000 # ~50 MB\n3638\t\n3639\t query_coalescing:\n3640\t max_subscribers: 1000\n3641\t max_pending_queries: 10000\n3642\t\n3643\t # dump_import: see §13.9 for the full schema. Key horizontal-scaling knob\n3644\t # surfaced here is chunk_size_bytes (256 MiB, fits one pod's buffer) — the\n3645\t # chunk-parallel coordinator in §14.5 Mode C shards work at this granularity.\n3646\t\n3647\t anti_entropy:\n3648\t max_read_concurrency: 2\n3649\t fingerprint_batch_size: 1000\n3650\t\n3651\t resharding:\n3652\t backfill_concurrency: 4\n3653\t backfill_batch_size: 1000\n3654\t\n3655\t peer_discovery:\n3656\t service_name: \"miroir-headless\"\n3657\t refresh_interval_s: 15\n3658\t\n3659\t leader_election:\n3660\t enabled: true # auto-true when replicas > 1\n3661\t lease_ttl_s: 10\n3662\t renew_interval_s: 3\n3663\t```\n3664\t\n3665\tKubernetes pod resource requests/limits:\n3666\t\n3667\t```yaml\n3668\tresources:\n3669\t requests:\n3670\t cpu: \"500m\"\n3671\t memory: \"1Gi\"\n3672\t limits:\n3673\t cpu: \"2000m\"\n3674\t memory: \"3584Mi\" # 3.5 GiB (leaves headroom under 3.75 GB node limit)\n3675\t```\n3676\t\n3677\t### 14.9 Resource-pressure metrics and alerts\n3678\t\n3679\tNew metrics to surface when a pod is near its envelope or the cluster is under-scaled:\n3680\t\n3681\t```\n3682\tmiroir_memory_pressure gauge 0=ok, 1=warn (>75%), 2=critical (>90%)\n3683\tmiroir_cpu_throttled_seconds_total counter cgroup CPU throttling\n3684\tmiroir_request_queue_depth gauge pending requests\n3685\tmiroir_background_queue_depth{job_type} gauge per job type\n3686\tmiroir_peer_pod_count gauge observed peer set size\n3687\tmiroir_leader gauge 1 if this pod is leader, 0 otherwise\n3688\tmiroir_owned_shards_count gauge shards this pod owns (mode A)\n3689\t```\n3690\t\n3691\tAlerts:\n3692\t\n3693\t```yaml\n3694\t- alert: MiroirMemoryPressure\n3695\t expr: miroir_memory_pressure >= 2\n3696\t for: 5m\n3697\t annotations: { summary: \"Pod near memory limit; HPA should scale\" }\n3698\t\n3699\t- alert: MiroirRequestQueueBacklog\n3700\t expr: miroir_request_queue_depth > 500\n3701\t for: 2m\n3702\t annotations: { summary: \"Request queue backlog — add pods\" }\n3703\t\n3704\t- alert: MiroirBackgroundJobBacklog\n3705\t expr: miroir_background_queue_depth > 100\n3706\t for: 10m\n3707\t annotations: { summary: \"Heavy background jobs queued — HPA should react\" }\n3708\t\n3709\t- alert: MiroirPeerDiscoveryGap\n3710\t expr: miroir_peer_pod_count < kube_deployment_status_replicas_ready{deployment=\"miroir\"}\n3711\t for: 2m\n3712\t annotations: { summary: \"Pods failing peer discovery — background work uneven\" }\n3713\t\n3714\t- alert: MiroirNoLeader\n3715\t expr: sum(miroir_leader) == 0\n3716\t for: 1m\n3717\t annotations: { summary: \"No pod holds leader lease — background coordination stalled\" }\n3718\t```\n3719\t\n3720\t### 14.10 Vertical scaling escape valve\n3721\t\n3722\tThe design target is 2 vCPU / 3.75 GB per pod. For edge cases (dev clusters, very small deployments, constrained environments), an operator **may** provision a single pod at a higher limit (e.g. 4 vCPU / 8 GB). All memory budgets scale linearly by multiplier and HPA may remain disabled.\n3723\t\n3724\tThis is supported but **not** the recommended production topology — horizontal scaling delivers better fault tolerance (zero-downtime rollouts, pod-loss survival) and avoids the all-eggs-one-basket risk of a single large pod. Single-large-pod mode is documented for completeness, not promoted as an equivalent option.\n3725\t\n3726\t---\n3727\t\n3728\t## 15. Open Problems\n3729\t\n3730\tThese are documented constraints, not blockers. Initial release ships with known limitations.\n3731\t\n3732\t1. **Shard migration write safety** — Dual-write during migration must not lose documents that arrive exactly at the migration cutover boundary. Requires careful sequencing: new writes go to both old and new nodes until the new node is confirmed complete, then old node stops receiving those shards. Race condition analysis needed before implementation. **Status:** Verified empirically via chaos tests (`cutover_race.rs`). Loss rate: 0/1M writes with AE on + delta pass on; 0/50K with delta pass alone. Hard refusal policy blocks `skip_delta_pass + anti_entropy_enabled=false`. See `docs/trade-offs.md` for full results and rationale.\n3733\t\n3734\t2. **Task state HA** — SQLite is single-writer. Running 2 Miroir replicas requires Redis. A future enhancement is a lightweight Raft-based in-process consensus so Redis is not required for HA mode.\n3735\t\n3736\t3. **Resharding (S change) vs. node scaling (N change)** — These are distinct operations with very different costs. Adding or removing nodes (changing N) is always supported without a full reindex; rendezvous hashing plus the `_miroir_shard` filter migration moves only the affected fraction of documents. Increasing the logical shard count (changing S) is a different matter: it changes the hash function output, invalidating every document's current shard assignment, and requires a full reindex. Operators must choose S generously at index creation (`S = max_nodes_per_group_ever × 8`, per Section 2 — groups are independent and each group's rendezvous assignment is scoped to its own node list) to avoid ever needing to reshard. A cluster that starts at 2 nodes per group and grows to 60 nodes per group never needs to reshard, as long as S was set to ≥ 480 at creation (or 512 for a round power of two). Node fleet elasticity is unlimited within the chosen S, and adding replica groups never consumes S headroom. **Status:** Online resharding path now exists — see §13.1 (shadow-index dual-hash). The \"choose S generously\" guidance remains the recommended default because online resharding doubles transient storage and write load; treat §13.1 as a remediation, not a license to under-provision.\n3737\t\n3738\t4. **Score normalization at scale** — `_rankingScore` is comparable across shards only when index settings are identical. Testing at scale with diverse document distributions is needed to validate that scores remain comparable in practice (e.g., do documents on a shard with very few matching results receive inflated scores?). **Status:** Settings-divergence risk is addressed by the two-phase broadcast and drift reconciler (§13.5). The open concern that remains is purely statistical — whether scores are comparable across shards with very different document-count distributions. Requires empirical validation at scale.\n3739\t\n3740\t5. **Dump import distribution** — Importing a Meilisearch dump via Miroir historically broadcast all documents to all nodes, transiently placing 100% of documents on every node. **Status:** Addressed by streaming routed dump import (§13.9); documents are routed to owning nodes on the fly, never broadcast. Broadcast mode retained as a fallback for dump variants Miroir cannot fully reconstruct via the public API.\n3741\t\n3742\t6. **arm64 support** — Deferred. Not planned for v0.x. Added when K8s ARM node support is required.\n3743\t\n3744\t **Current state:** Everything is amd64-only — `rust-toolchain.toml` targets `x86_64-unknown-linux-musl`, Dockerfile builds only that target, CI binaries are named `*-linux-amd64`, and there is no multi-arch Docker manifest. The fleet is entirely amd64 (iad-ci, ardenone cluster nodes).\n3745\t\n3746\t **When prioritized, the changes are:**\n3747\t\n3748\t - **CI cross-compilation:** The Argo Workflow `cargo-build` step needs a matrix over targets — install `aarch64-linux-gnu` cross-compiler, add `rustup target add aarch64-unknown-linux-musl`, build both `x86_64-unknown-linux-musl` and `aarch64-unknown-linux-musl` for `miroir-proxy` and `miroir-ctl`.\n3749\t - **Docker multi-arch:** Kaniko build needs `--customPlatform=linux/amd64,linux/arm64` (or equivalent) for manifest list support. Image tag `ghcr.io/jedarden/miroir:` should span both architectures.\n3750\t - **Binary naming:** Add `miroir-proxy-linux-arm64` and `miroir-ctl-linux-arm64` to GitHub releases.\n3751\t - **Helm chart:** No changes — the chart is arch-agnostic at the k8s layer; node selectors choose the right manifest entry automatically.\n3752\t - **`rust-toolchain.toml`:** Add `aarch64-unknown-linux-musl` to the targets array.\n3753\t - **Phase 9 testing:** Add arm64 test runs once the CI pipeline supports cross-compilation.\n3754\t\n3755\t **Trigger for prioritization:** A concrete use case emerges — e.g., deploying to Hetzner Ampere, AWS Graviton, GCP Tau T2A, or Rackspace Spot ARM nodes.\n3756\t"}]},"parent_tool_use_id":null,"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","uuid":"e4713f40-5c9a-47ad-acf0-adb952f9eee5","timestamp":"2026-05-23T06:50:23.318Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/docs/plan/plan.md","content":"### 14.5 Horizontal scaling: background work\n\nBackground work must be partitioned, never duplicated across pods. Three coordination modes cover all background tasks:\n\n**Mode A — Shard-partitioned ownership (parallel by shard).**\n\nEach pod owns a subset of shards for background processing. Assignment uses rendezvous hashing over the current peer set:\n\n```\npeers = discover_peers() // headless-Service DNS lookup\nowns(s, p) = p == top1_by_score(hash(s || pid) for pid in peers)\n```\n\nApplies to:\n- Anti-entropy reconciler (§13.8) — each pod fingerprints and repairs the shards it owns\n- Settings drift check (§13.5) — each pod polls a subset of (index, node) settings-hash pairs\n- Task registry pruner — each pod prunes tasks where it wins the rendezvous score for the task's `miroir_id`: `top1_by_score(hash(miroir_id || pid) for pid in peers) == self_pid`. Matches anti-entropy / drift-check partitioning; minimal reshuffling on scale events.\n\nWhen the peer set changes (scale event, pod restart), rendezvous redistributes ownership with minimal reshuffling. No explicit handoff — the new owner runs the next scheduled pass. Transient double-work during a 15-second discovery window is harmless: anti-entropy is idempotent, settings-repair is idempotent.\n\n**Mode B — Leader-only (singleton coordinator).**\n\nExactly one pod holds the leader lease at a time, backed by a lease row in the task store (Redis `SET NX EX 10` renewed every 3s; SQLite advisory lock for single-replica deployments). The leader runs operations that must be singleton or atomic:\n\n- Reshard coordinator (§13.1) — one reshard per index at a time; cutover is atomic\n- Rebalancer (existing Section 4) — already uses advisory lock\n- Alias flip serializer (§13.7) — atomic per alias\n- Two-phase settings broadcast (§13.5) — one settings change in flight per index\n\nLeader loss mid-operation causes a pause; the new leader reads the persisted phase state from the task store and resumes from the last committed phase. All operations are idempotent by design and safe to resume at any phase boundary.\n\n**Mode C — Work-queued (streaming jobs that outgrow a single pod).**\n\nHeavy streaming operations — large dump imports (§13.9), large reshard backfills (§13.1) — can exceed a single pod's envelope. They are submitted as **jobs** to a queue in the task store; any pod claims a job with lease-based ownership:\n\n```\njob = {\n id: uuid,\n type: \"dump_import\" | \"reshard_backfill\",\n params: { ... },\n state: \"queued\" | \"in_progress\" | \"completed\" | \"failed\",\n claimed_by: pod_id | null,\n claim_expires_at: ts, // heartbeat every 10s, timeout 30s\n progress: { bytes_processed, docs_routed, last_cursor, ... },\n}\n```\n\nA large dump import is **split into chunks** on NDJSON line boundaries by the first pod that picks it up; chunks are re-enqueued as independent jobs. Each chunk is bounded by `dump_import.chunk_size_bytes` (default 256 MiB) so one chunk fits a pod's buffer. HPA reacts to queue depth: if `miroir_background_queue_depth > 0` and pods are at capacity, add pods; once queue drains, scale back down.\n\nReshard backfill partitions by shard-id range and uses the same chunked-job mechanism. Progress cursors are persisted per chunk so a crashed claim resumes at the last committed offset (idempotent via primary keys).\n\n**Peer discovery.** All three modes rely on the current peer set. Mechanism:\n\n- Kubernetes Downward API injects `POD_NAME` and `POD_IP` as env vars\n- A headless Service (`miroir-headless`) with label selector on the Deployment exposes pod IPs via DNS SRV records\n- Each pod refreshes its peer set every 15s via SRV lookup\n- No external service registry required; no Kubernetes API calls from the pod\n\n### 14.6 Per-feature scaling behavior\n\n| Capability | Scaling mode | Notes |\n|------------|-------------|-------|\n| §13.1 Online resharding | B (leader) + C (backfill queue) | Leader owns phase state machine; any pod consumes backfill chunks. Bounded-memory backfill via paginated `filter=_miroir_shard={id}`. |\n| §13.2 Hedged requests | stateless per-request | No coordination needed — each pod hedges its own requests. |\n| §13.3 Adaptive replica selection | per-pod EWMA | Each pod's scores are local; pods converge independently. Slight divergence is harmless. |\n| §13.4 Shard-aware query planner | per-request | Pure function of filter. Plan cache is per-pod. |\n| §13.5 Two-phase settings broadcast | B (leader) | Leader issues PATCH and verifies. Drift reconciler runs in mode A. |\n| §13.6 Session pinning | shared-state per-pod cache | Session row lives in task store (Redis); per-pod LRU caches it. Any pod can serve a session. |\n| §13.7 Atomic index aliases | shared state | Alias table in task store. All pods read same table with short TTL cache. |\n| §13.8 Anti-entropy reconciler | A (shard-partitioned) | Each pod fingerprints its owned shards. Naturally horizontal. |\n| §13.9 Streaming dump import | C (chunked jobs) | 500 GB dump → chunks → pods consume from queue; HPA scales on queue depth. |\n| §13.10 Idempotency + coalescing | per-pod + shared fallback | Idempotency cache per-pod with task-store lookup on miss — a retry on a different pod still dedups. Coalescing is per-pod only (acceptable: identical concurrent queries hitting different pods each issue their own scatter, which is rare and bounded by pod count). |\n| §13.11 Multi-search | stateless per-request | Sub-queries fan out using existing scatter infrastructure; each sub-query is independently routed. |\n| §13.12 Vector / hybrid search | stateless per-request | Merger uses more memory per request (see §14.2 vector over-fetch scratch row); no cross-pod coordination. |\n| §13.13 CDC publisher | per-pod publishers with shared cursors | `cdc_cursors` in the task store serialize cursor advancement via compare-and-swap; each pod publishes its own shard of events. Overflow buffer in Redis is shared across pods. |\n| §13.14 TTL sweeper | A (shard-partitioned) | Each pod sweeps only its rendezvous-owned shards; no duplicate deletes across pods. |\n| §13.15 Tenant affinity | stateless per-request | Hash-or-explicit routing decision; no shared state on the hot path (tenant map LRU is per-pod). |\n| §13.16 Shadow tee | stateless per-request | Each pod independently decides (per its local `sample_rate` RNG) whether to shadow a given request. |\n| §13.17 ILM rollover | B (leader-only) | Serialized alias flips + index create/delete; exactly one pod runs the daily policy evaluator at a time. |\n| §13.18 Canary runner | A (shard-partitioned) | Each canary ID is rendezvous-owned by exactly one pod per interval; no duplicate canary runs. |\n| §13.19 Admin UI | per-pod | Any pod serves the SPA; stateful sections read the shared task store. |\n| §13.20 Explain API | stateless per-request | Pure function of request + topology + config; no cross-pod coordination. |\n| §13.21 Search UI | per-pod (SPA + static assets); rate limiter needs shared state | Any pod serves the SPA. **Rate-limiter requirement:** multi-pod deployments MUST set `search_ui.rate_limit.backend: redis` — `values.schema.json` rejects `backend: local` when `miroir.replicas > 1`. With `backend: local`, the effective cluster-wide rate is `per_ip × pod_count` because each pod counts independently. Redis rate-limit bucket memory sized at ~20 MB per 10k active IPs (§14.7). |\n\n**Note.** TTL sweeper (§13.14), CDC publisher (§13.13), and canary runner (§13.18) are all Mode-A partitioned across pods; each pod consumes only its share of the workload, so the §14.2 memory rows for these features scale with `1/pod_count`.\n\n### 14.7 Revised deployment sizing matrix\n\nEach row gives the orchestrator pod count (2 vCPU / 3.75 GB each) for the stated workload. Meilisearch node sizing follows Section 6 independently.\n\n| Corpus | Peak QPS | Orchestrator pods | Task store |\n|--------|----------|-------------------|------------|\n| ≤ 10 GB | ≤ 500 | 2 (HA) | Redis (or SQLite if replicas=1) |\n| ≤ 50 GB | ≤ 2 k | 2–4 (HPA) | Redis |\n| ≤ 200 GB | ≤ 5 k | 4–8 (HPA) | Redis |\n| ≤ 1 TB | ≤ 20 k | 8–12 (HPA) | Redis |\n| ≤ 5 TB | ≤ 100 k | 12–24 (HPA) | Redis (clustered or Sentinel) |\n\nOrchestrator count scales with query throughput; Meilisearch node count scales with corpus size and RG/RF. They are orthogonal.\n\n**Task-store / Redis memory accounting.** When Redis is the task store, it also backs shared state for idempotency replay keys, session pinning rows, alias cache, background job queue, leader lease, CDC overflow buffer (when configured), and — new in §13.21 — search UI rate-limit buckets. Add **~20 MB for search UI rate-limit buckets at 10k active IPs** on top of the task-store baseline when `search_ui.rate_limit.backend: redis`. Bucket rows auto-expire per `redis_ttl_s` so the footprint stays bounded under IP-scan/spray attacks.\n\n### 14.8 Resource-aware configuration defaults\n\nEvery resource-sensitive knob has a default sized for the 2 vCPU / 3.75 GB envelope:\n\n```yaml\nmiroir:\n server:\n max_body_bytes: 104857600 # 100 MiB per request\n max_concurrent_requests: 500\n request_timeout_ms: 30000\n\n connection_pool_per_node:\n max_idle: 32\n max_total: 128\n idle_timeout_s: 60\n\n task_registry:\n cache_size: 10000\n redis_pool_max: 50\n\n idempotency:\n max_cached_keys: 1000000 # ~100 MB\n ttl_seconds: 86400\n\n session_pinning:\n max_sessions: 100000 # ~50 MB\n\n query_coalescing:\n max_subscribers: 1000\n max_pending_queries: 10000\n\n # dump_import: see §13.9 for the full schema. Key horizontal-scaling knob\n # surfaced here is chunk_size_bytes (256 MiB, fits one pod's buffer) — the\n # chunk-parallel coordinator in §14.5 Mode C shards work at this granularity.\n\n anti_entropy:\n max_read_concurrency: 2\n fingerprint_batch_size: 1000\n\n resharding:\n backfill_concurrency: 4\n backfill_batch_size: 1000\n\n peer_discovery:\n service_name: \"miroir-headless\"\n refresh_interval_s: 15\n\n leader_election:\n enabled: true # auto-true when replicas > 1\n lease_ttl_s: 10\n renew_interval_s: 3\n```\n\nKubernetes pod resource requests/limits:\n\n```yaml\nresources:\n requests:\n cpu: \"500m\"\n memory: \"1Gi\"\n limits:\n cpu: \"2000m\"\n memory: \"3584Mi\" # 3.5 GiB (leaves headroom under 3.75 GB node limit)\n```\n\n### 14.9 Resource-pressure metrics and alerts\n\nNew metrics to surface when a pod is near its envelope or the cluster is under-scaled:\n\n```\nmiroir_memory_pressure gauge 0=ok, 1=warn (>75%), 2=critical (>90%)\nmiroir_cpu_throttled_seconds_total counter cgroup CPU throttling\nmiroir_request_queue_depth gauge pending requests\nmiroir_background_queue_depth{job_type} gauge per job type\nmiroir_peer_pod_count gauge observed peer set size\nmiroir_leader gauge 1 if this pod is leader, 0 otherwise\nmiroir_owned_shards_count gauge shards this pod owns (mode A)\n```\n\nAlerts:\n\n```yaml\n- alert: MiroirMemoryPressure\n expr: miroir_memory_pressure >= 2\n for: 5m\n annotations: { summary: \"Pod near memory limit; HPA should scale\" }\n\n- alert: MiroirRequestQueueBacklog\n expr: miroir_request_queue_depth > 500\n for: 2m\n annotations: { summary: \"Request queue backlog — add pods\" }\n\n- alert: MiroirBackgroundJobBacklog\n expr: miroir_background_queue_depth > 100\n for: 10m\n annotations: { summary: \"Heavy background jobs queued — HPA should react\" }\n\n- alert: MiroirPeerDiscoveryGap\n expr: miroir_peer_pod_count < kube_deployment_status_replicas_ready{deployment=\"miroir\"}\n for: 2m\n annotations: { summary: \"Pods failing peer discovery — background work uneven\" }\n\n- alert: MiroirNoLeader\n expr: sum(miroir_leader) == 0\n for: 1m\n annotations: { summary: \"No pod holds leader lease — background coordination stalled\" }\n```\n\n### 14.10 Vertical scaling escape valve\n\nThe design target is 2 vCPU / 3.75 GB per pod. For edge cases (dev clusters, very small deployments, constrained environments), an operator **may** provision a single pod at a higher limit (e.g. 4 vCPU / 8 GB). All memory budgets scale linearly by multiplier and HPA may remain disabled.\n\nThis is supported but **not** the recommended production topology — horizontal scaling delivers better fault tolerance (zero-downtime rollouts, pod-loss survival) and avoids the all-eggs-one-basket risk of a single large pod. Single-large-pod mode is documented for completeness, not promoted as an equivalent option.\n\n---\n\n## 15. Open Problems\n\nThese are documented constraints, not blockers. Initial release ships with known limitations.\n\n1. **Shard migration write safety** — Dual-write during migration must not lose documents that arrive exactly at the migration cutover boundary. Requires careful sequencing: new writes go to both old and new nodes until the new node is confirmed complete, then old node stops receiving those shards. Race condition analysis needed before implementation. **Status:** Verified empirically via chaos tests (`cutover_race.rs`). Loss rate: 0/1M writes with AE on + delta pass on; 0/50K with delta pass alone. Hard refusal policy blocks `skip_delta_pass + anti_entropy_enabled=false`. See `docs/trade-offs.md` for full results and rationale.\n\n2. **Task state HA** — SQLite is single-writer. Running 2 Miroir replicas requires Redis. A future enhancement is a lightweight Raft-based in-process consensus so Redis is not required for HA mode.\n\n3. **Resharding (S change) vs. node scaling (N change)** — These are distinct operations with very different costs. Adding or removing nodes (changing N) is always supported without a full reindex; rendezvous hashing plus the `_miroir_shard` filter migration moves only the affected fraction of documents. Increasing the logical shard count (changing S) is a different matter: it changes the hash function output, invalidating every document's current shard assignment, and requires a full reindex. Operators must choose S generously at index creation (`S = max_nodes_per_group_ever × 8`, per Section 2 — groups are independent and each group's rendezvous assignment is scoped to its own node list) to avoid ever needing to reshard. A cluster that starts at 2 nodes per group and grows to 60 nodes per group never needs to reshard, as long as S was set to ≥ 480 at creation (or 512 for a round power of two). Node fleet elasticity is unlimited within the chosen S, and adding replica groups never consumes S headroom. **Status:** Online resharding path now exists — see §13.1 (shadow-index dual-hash). The \"choose S generously\" guidance remains the recommended default because online resharding doubles transient storage and write load; treat §13.1 as a remediation, not a license to under-provision.\n\n4. **Score normalization at scale** — `_rankingScore` is comparable across shards only when index settings are identical. Testing at scale with diverse document distributions is needed to validate that scores remain comparable in practice (e.g., do documents on a shard with very few matching results receive inflated scores?). **Status:** Settings-divergence risk is addressed by the two-phase broadcast and drift reconciler (§13.5). The open concern that remains is purely statistical — whether scores are comparable across shards with very different document-count distributions. Requires empirical validation at scale.\n\n5. **Dump import distribution** — Importing a Meilisearch dump via Miroir historically broadcast all documents to all nodes, transiently placing 100% of documents on every node. **Status:** Addressed by streaming routed dump import (§13.9); documents are routed to owning nodes on the fly, never broadcast. Broadcast mode retained as a fallback for dump variants Miroir cannot fully reconstruct via the public API.\n\n6. **arm64 support** — Deferred. Not planned for v0.x. Added when K8s ARM node support is required.\n\n **Current state:** Everything is amd64-only — `rust-toolchain.toml` targets `x86_64-unknown-linux-musl`, Dockerfile builds only that target, CI binaries are named `*-linux-amd64`, and there is no multi-arch Docker manifest. The fleet is entirely amd64 (iad-ci, ardenone cluster nodes).\n\n **When prioritized, the changes are:**\n\n - **CI cross-compilation:** The Argo Workflow `cargo-build` step needs a matrix over targets — install `aarch64-linux-gnu` cross-compiler, add `rustup target add aarch64-unknown-linux-musl`, build both `x86_64-unknown-linux-musl` and `aarch64-unknown-linux-musl` for `miroir-proxy` and `miroir-ctl`.\n - **Docker multi-arch:** Kaniko build needs `--customPlatform=linux/amd64,linux/arm64` (or equivalent) for manifest list support. Image tag `ghcr.io/jedarden/miroir:` should span both architectures.\n - **Binary naming:** Add `miroir-proxy-linux-arm64` and `miroir-ctl-linux-arm64` to GitHub releases.\n - **Helm chart:** No changes — the chart is arch-agnostic at the k8s layer; node selectors choose the right manifest entry automatically.\n - **`rust-toolchain.toml`:** Add `aarch64-unknown-linux-musl` to the targets array.\n - **Phase 9 testing:** Add arm64 test runs once the CI pipeline supports cross-compilation.\n\n **Trigger for prioritization:** A concrete use case emerges — e.g., deploying to Hetzner Ampere, AWS Graviton, GCP Tau T2A, or Rackspace Spot ARM nodes.\n","numLines":247,"startLine":3510,"totalLines":3756}}} +{"type":"system","subtype":"status","status":"requesting","uuid":"701d4df3-1c4b-4529-bf5e-530938771084","session_id":"9b1ab346-8bcf-48fe-9e09-304887755605"} 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Let me run the tests and create a verification summary."}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":null,"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","uuid":"a1812fca-1a8e-4af5-99d1-cc631545c8b8"} +{"type":"stream_event","event":{"type":"content_block_stop","index":1},"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","parent_tool_use_id":null,"uuid":"f3c08feb-1a6d-4104-a082-7bd50459a728"} +{"type":"stream_event","event":{"type":"content_block_start","index":2,"content_block":{"type":"tool_use","id":"call_4cb7051f482e43019b936164","name":"Bash","input":{}}},"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","parent_tool_use_id":null,"uuid":"baf02a1c-11a9-4ff4-ba62-862f1a715972"} +{"type":"stream_event","event":{"type":"content_block_delta","index":2,"delta":{"type":"input_json_delta","partial_json":"{\"command\":\"cargo test --package miroir-core --lib --features peer-discovery 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crates/miroir-core/src/multi_search.rs:26:9\n |\n26 | pub indexUid: String,\n | ^^^^^^^^ help: convert the identifier to snake case: `index_uid`\n |\n = note: `#[warn(non_snake_case)]` on by default\n\nwarning: `miroir-core` (lib test) generated 61 warnings (run `cargo fix --lib -p miroir-core --tests` to apply 24 suggestions)\n Finished `test` profile [unoptimized + debuginfo] target(s) in 0.15s\n Running unittests src/lib.rs (target/debug/deps/miroir_core-e09ad63f21c817a7)\n\nrunning 3 tests\ntest peer_discovery::tests::test_peer_set_empty ... ok\ntest peer_discovery::tests::test_peer_set_with_peers ... ok\ntest peer_discovery::tests::test_srv_target_pod_name_extraction ... ok\n\ntest result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 392 filtered out; finished in 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The implementation is complete. 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Helm Templates ✓\\n- `charts/miroir/templates/miroir-headless.yaml` - Headless Service with label selector\\n- `charts/miroir/templates/miroir-deployment.yaml` - POD_NAME, POD_NAMESPACE, POD_IP env vars via Downward API\\n\\n### 2. Rust Implementation ✓\\n- `crates/miroir-core/src/peer_discovery.rs` - SRV-based peer discovery module\\n - `PeerSet` struct with `peers: Vec` and `refreshed_at: Instant`\\n - `PeerDiscovery::refresh()` method for SRV lookup\\n - Feature flag: `peer-discovery` (uses `trust-dns-resolver`)\\n\\n### 3. Configuration ✓\\n- `crates/miroir-core/src/config.rs` - `PeerDiscoveryConfig` struct\\n - `service_name: \\\"miroir-headless\\\"` (default)\\n - `refresh_interval_s: 15` (default)\\n- `charts/miroir/values.yaml` - Config section with same defaults\\n\\n### 4. Main Loop Integration ✓\\n- `crates/miroir-proxy/src/main.rs` (lines 407-438)\\n - Creates `PeerDiscovery` instance when POD_NAME is set\\n - Spawns background refresh loop with configurable interval\\n - Calls `metrics.set_peer_pod_count(count)` on successful refresh\\n\\n### 5. Metrics ✓\\n- `crates/miroir-proxy/src/middleware.rs` (line 823-825, 1582-1584)\\n - `miroir_peer_pod_count` gauge metric\\n - `miroir_leader` gauge metric\\n - `miroir_owned_shards_count` gauge metric\\n\\n### 6. Verification Script ✓\\n- `tests/verify_p6_2_peer_discovery.sh` - Checks metrics and env vars\\n - Shebang: `#!/usr/bin/env bash` (NixOS compatible)\\n\\n## Acceptance Tests (require K8s environment)\\n\\nThe following acceptance tests require a real Kubernetes deployment:\\n\\n1. **3-pod deployment**: Each pod sees all 3 peer names within 30s of last pod ready\\n2. **Scale 3→5**: New peers discovered within `refresh_interval_s × 2`\\n3. **Pod eviction**: Crashed pod drops from peer set within `refresh_interval_s × 2`\\n4. **Metric verification**: `miroir_peer_pod_count` matches `kube_deployment_status_replicas_ready`\\n\\n## Unit Tests\\n\\nAll peer discovery unit tests pass:\\n- `test_peer_set_empty` ✓\\n- `test_peer_set_with_peers` ✓\\n- `test_srv_target_pod_name_extraction` ✓\\n\\n## Implementation Notes\\n\\n- The peer discovery implementation was already complete in the codebase\\n- No code changes were required - this task was verification-only\\n- The `peer-discovery` feature flag must be enabled for SRV lookups to work\\n- Peer discovery automatically disables when `POD_NAME=unknown` (local dev)\\n\\n## Plan §14.5 Alignment\\n\\nFully implements plan §14.5 \\\"Peer discovery\\\" with:\\n- Headless Service SRV lookup mechanism\\n- 15-second refresh interval (configurable)\\n- Zero-config operation (uses Downward API env vars)\\n- No K8s API calls from pods\\n- Transient double-work is acceptable (idempotent operations)\\n\"}"}},"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","parent_tool_use_id":null,"uuid":"548780ab-9ba3-4cd2-90d7-87bcb3c68825"} +{"type":"assistant","message":{"id":"msg_20260523145051e918d1b8cd354d96","type":"message","role":"assistant","model":"glm-4.7","content":[{"type":"tool_use","id":"call_7d25c0ae1ef7414fa2b46e69","name":"Write","input":{"file_path":"/home/coding/miroir/notes/miroir-m9q.2-verification-summary.md","content":"# P6.2 Peer Discovery Implementation Verification\n\n## Summary\n\nVerified that peer discovery per plan §14.5 is fully implemented:\n\n### 1. Helm Templates ✓\n- `charts/miroir/templates/miroir-headless.yaml` - Headless Service with label selector\n- `charts/miroir/templates/miroir-deployment.yaml` - POD_NAME, POD_NAMESPACE, POD_IP env vars via Downward API\n\n### 2. Rust Implementation ✓\n- `crates/miroir-core/src/peer_discovery.rs` - SRV-based peer discovery module\n - `PeerSet` struct with `peers: Vec` and `refreshed_at: Instant`\n - `PeerDiscovery::refresh()` method for SRV lookup\n - Feature flag: `peer-discovery` (uses `trust-dns-resolver`)\n\n### 3. Configuration ✓\n- `crates/miroir-core/src/config.rs` - `PeerDiscoveryConfig` struct\n - `service_name: \"miroir-headless\"` (default)\n - `refresh_interval_s: 15` (default)\n- `charts/miroir/values.yaml` - Config section with same defaults\n\n### 4. Main Loop Integration ✓\n- `crates/miroir-proxy/src/main.rs` (lines 407-438)\n - Creates `PeerDiscovery` instance when POD_NAME is set\n - Spawns background refresh loop with configurable interval\n - Calls `metrics.set_peer_pod_count(count)` on successful refresh\n\n### 5. Metrics ✓\n- `crates/miroir-proxy/src/middleware.rs` (line 823-825, 1582-1584)\n - `miroir_peer_pod_count` gauge metric\n - `miroir_leader` gauge metric\n - `miroir_owned_shards_count` gauge metric\n\n### 6. Verification Script ✓\n- `tests/verify_p6_2_peer_discovery.sh` - Checks metrics and env vars\n - Shebang: `#!/usr/bin/env bash` (NixOS compatible)\n\n## Acceptance Tests (require K8s environment)\n\nThe following acceptance tests require a real Kubernetes deployment:\n\n1. **3-pod deployment**: Each pod sees all 3 peer names within 30s of last pod ready\n2. **Scale 3→5**: New peers discovered within `refresh_interval_s × 2`\n3. **Pod eviction**: Crashed pod drops from peer set within `refresh_interval_s × 2`\n4. **Metric verification**: `miroir_peer_pod_count` matches `kube_deployment_status_replicas_ready`\n\n## Unit Tests\n\nAll peer discovery unit tests pass:\n- `test_peer_set_empty` ✓\n- `test_peer_set_with_peers` ✓\n- `test_srv_target_pod_name_extraction` ✓\n\n## Implementation Notes\n\n- The peer discovery implementation was already complete in the codebase\n- No code changes were required - this task was verification-only\n- The `peer-discovery` feature flag must be enabled for SRV lookups to work\n- Peer discovery automatically disables when `POD_NAME=unknown` (local dev)\n\n## Plan §14.5 Alignment\n\nFully implements plan §14.5 \"Peer discovery\" with:\n- Headless Service SRV lookup mechanism\n- 15-second refresh interval (configurable)\n- Zero-config operation (uses Downward API env vars)\n- No K8s API calls from pods\n- Transient double-work is acceptable (idempotent operations)\n"}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":null,"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","uuid":"d7cb9280-758d-4573-aac1-24dbcc84ef21"} +{"type":"stream_event","event":{"type":"content_block_stop","index":2},"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","parent_tool_use_id":null,"uuid":"bfb1bb37-daa0-44eb-a127-00a860cf16f7"} +{"type":"stream_event","event":{"type":"message_delta","delta":{"stop_reason":"tool_use","stop_sequence":null},"usage":{"input_tokens":509,"output_tokens":817,"cache_read_input_tokens":120448,"server_tool_use":{"web_search_requests":0},"service_tier":"standard"}},"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","parent_tool_use_id":null,"uuid":"1fc7b047-70b8-4743-ab32-0977d990d53a"} +{"type":"stream_event","event":{"type":"message_stop"},"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","parent_tool_use_id":null,"uuid":"d5d3f03b-47bc-44a2-8f38-788134c54c1c"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_7d25c0ae1ef7414fa2b46e69","type":"tool_result","content":"File created successfully at: /home/coding/miroir/notes/miroir-m9q.2-verification-summary.md (file state is current in your context — no need to Read it back)"}]},"parent_tool_use_id":null,"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","uuid":"ded428b9-6d5e-4dfc-b3a6-a68a07a37a34","timestamp":"2026-05-23T06:51:05.900Z","tool_use_result":{"type":"create","filePath":"/home/coding/miroir/notes/miroir-m9q.2-verification-summary.md","content":"# P6.2 Peer Discovery Implementation Verification\n\n## Summary\n\nVerified that peer discovery per plan §14.5 is fully implemented:\n\n### 1. Helm Templates ✓\n- `charts/miroir/templates/miroir-headless.yaml` - Headless Service with label selector\n- `charts/miroir/templates/miroir-deployment.yaml` - POD_NAME, POD_NAMESPACE, POD_IP env vars via Downward API\n\n### 2. Rust Implementation ✓\n- `crates/miroir-core/src/peer_discovery.rs` - SRV-based peer discovery module\n - `PeerSet` struct with `peers: Vec` and `refreshed_at: Instant`\n - `PeerDiscovery::refresh()` method for SRV lookup\n - Feature flag: `peer-discovery` (uses `trust-dns-resolver`)\n\n### 3. Configuration ✓\n- `crates/miroir-core/src/config.rs` - `PeerDiscoveryConfig` struct\n - `service_name: \"miroir-headless\"` (default)\n - `refresh_interval_s: 15` (default)\n- `charts/miroir/values.yaml` - Config section with same defaults\n\n### 4. Main Loop Integration ✓\n- `crates/miroir-proxy/src/main.rs` (lines 407-438)\n - Creates `PeerDiscovery` instance when POD_NAME is set\n - Spawns background refresh loop with configurable interval\n - Calls `metrics.set_peer_pod_count(count)` on successful refresh\n\n### 5. Metrics ✓\n- `crates/miroir-proxy/src/middleware.rs` (line 823-825, 1582-1584)\n - `miroir_peer_pod_count` gauge metric\n - `miroir_leader` gauge metric\n - `miroir_owned_shards_count` gauge metric\n\n### 6. Verification Script ✓\n- `tests/verify_p6_2_peer_discovery.sh` - Checks metrics and env vars\n - Shebang: `#!/usr/bin/env bash` (NixOS compatible)\n\n## Acceptance Tests (require K8s environment)\n\nThe following acceptance tests require a real Kubernetes deployment:\n\n1. **3-pod deployment**: Each pod sees all 3 peer names within 30s of last pod ready\n2. **Scale 3→5**: New peers discovered within `refresh_interval_s × 2`\n3. **Pod eviction**: Crashed pod drops from peer set within `refresh_interval_s × 2`\n4. **Metric verification**: `miroir_peer_pod_count` matches `kube_deployment_status_replicas_ready`\n\n## Unit Tests\n\nAll peer discovery unit tests pass:\n- `test_peer_set_empty` ✓\n- `test_peer_set_with_peers` ✓\n- `test_srv_target_pod_name_extraction` ✓\n\n## Implementation Notes\n\n- The peer discovery implementation was already complete in the codebase\n- No code changes were required - this task was verification-only\n- The `peer-discovery` feature flag must be enabled for 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with NixOS-compatible shebang\n\n## Retrospective\n- **What worked:** The implementation was already complete; systematic verification of each component (Helm, Rust, config, main loop, metrics) confirmed alignment with plan \\$14.5\n- **What didn't:** N/A - verification task, no implementation changes required\n- **Surprise:** The peer-discovery feature flag and conditional compilation were already properly set up\n- **Reusable pattern:** For verification tasks, check: (1) plan requirements, (2) Helm manifests, (3) Rust implementation, (4) main loop integration, (5) metrics, (6) verification scripts\"","description":"Close bead with retrospective using --"}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":null,"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","uuid":"607605e8-13ae-42bc-b216-cd138a2507d9"} 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Implementation Verified\n\nAll components of plan $14.5 peer discovery are in place:\n- Helm headless Service (miroir-headless.yaml)\n- Downward API env vars (POD_NAME, POD_NAMESPACE, POD_IP)\n- Rust peer_discovery module with SRV lookup (trust-dns-resolver)\n- Background refresh loop in main.rs (15s interval, configurable)\n- miroir_peer_pod_count metric\n- Verification script with NixOS-compatible shebang\n\n## Retrospective\n- **What worked:** The implementation was already complete; systematic verification of each component (Helm, Rust, config, main loop, metrics) confirmed alignment with plan $14.5\n- **What didn't:** N/A - verification task, no implementation changes required\n- **Surprise:** The peer-discovery feature flag and conditional compilation were already properly set up\n- **Reusable pattern:** For verification tasks, check: (1) plan requirements, (2) Helm manifests, (3) Rust implementation, (4) main loop integration, (5) metrics, (6) verification scripts' found\n\nUsage: br close [OPTIONS] \n\nFor more information, try '--help'.","is_error":true,"tool_use_id":"call_d1a8a30a095146a699014250"}]},"parent_tool_use_id":null,"session_id":"9b1ab346-8bcf-48fe-9e09-304887755605","uuid":"ea6a8b68-37e6-4be1-bd81-be4cbe140b83","timestamp":"2026-05-23T06:51:38.346Z","tool_use_result":"Error: Exit code 1\nError: error: unexpected argument 'P6.2 Peer discovery via headless Service + Downward API - VERIFICATION COMPLETE\n\n## Implementation Verified\n\nAll components of plan $14.5 peer discovery are in place:\n- Helm headless Service (miroir-headless.yaml)\n- Downward API env vars (POD_NAME, POD_NAMESPACE, POD_IP)\n- Rust peer_discovery module with SRV lookup (trust-dns-resolver)\n- Background refresh loop in main.rs (15s interval, configurable)\n- miroir_peer_pod_count metric\n- Verification script with NixOS-compatible shebang\n\n## Retrospective\n- **What worked:** The implementation was already complete; systematic verification of each component (Helm, Rust, config, main loop, metrics) confirmed alignment with plan $14.5\n- **What didn't:** N/A - verification task, no implementation changes required\n- **Surprise:** The peer-discovery feature flag and conditional compilation were already properly set up\n- **Reusable pattern:** For verification tasks, check: (1) plan requirements, (2) Helm manifests, (3) Rust implementation, (4) main loop integration, (5) metrics, (6) verification scripts' found\n\nUsage: br close [OPTIONS] \n\nFor more information, try '--help'."} 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-{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_029bdece803f47e982d9d3ac","type":"tool_result","content":"1\t#[cfg(feature = \"redis-store\")]\n2\tmod redis;\n3\tmod sqlite;\n4\t\n5\t#[cfg(feature = \"redis-store\")]\n6\tpub use redis::{RedisTaskStore, SearchUiScopedKey};\n7\tpub use sqlite::SqliteTaskStore;\n8\t\n9\tuse crate::Result;\n10\tuse std::collections::HashMap;\n11\t\n12\t/// Per-table store operations covering tables 1–14 from plan §4.\n13\tpub trait TaskStore: Send + Sync {\n14\t // --- Lifecycle ---\n15\t\n16\t /// Run idempotent migrations for all tables. Safe to call on every startup.\n17\t fn migrate(&self) -> Result<()>;\n18\t\n19\t // --- Table 1: tasks ---\n20\t\n21\t /// Insert a new task row.\n22\t fn insert_task(&self, task: &NewTask) -> Result<()>;\n23\t\n24\t /// Get a task by miroir_id.\n25\t fn get_task(&self, miroir_id: &str) -> Result>;\n26\t\n27\t /// Update a task's status.\n28\t fn update_task_status(&self, miroir_id: &str, status: &str) -> Result;\n29\t\n30\t /// Update a node task within a task's node_tasks JSON.\n31\t fn update_node_task(&self, miroir_id: &str, node_id: &str, task_uid: u64) -> Result;\n32\t\n33\t /// Set the error field on a task.\n34\t fn set_task_error(&self, miroir_id: &str, error: &str) -> Result;\n35\t\n36\t /// List tasks with optional status filter and pagination.\n37\t fn list_tasks(&self, filter: &TaskFilter) -> Result>;\n38\t\n39\t /// Prune terminal tasks older than `cutoff_ms` (created_at < cutoff_ms\n40\t /// AND status IN (succeeded, failed, canceled)). Returns number deleted.\n41\t /// Limited to `batch_size` rows per call.\n42\t fn prune_tasks(&self, cutoff_ms: i64, batch_size: u32) -> Result;\n43\t\n44\t /// Count total rows in the tasks table (for the miroir_task_registry_size gauge).\n45\t fn task_count(&self) -> Result;\n46\t\n47\t // --- Table 2: node_settings_version ---\n48\t\n49\t /// Upsert a settings version for (index_uid, node_id).\n50\t fn upsert_node_settings_version(\n51\t &self,\n52\t index_uid: &str,\n53\t node_id: &str,\n54\t version: i64,\n55\t updated_at: i64,\n56\t ) -> Result<()>;\n57\t\n58\t /// Get the settings version for (index_uid, node_id).\n59\t fn get_node_settings_version(\n60\t &self,\n61\t index_uid: &str,\n62\t node_id: &str,\n63\t ) -> Result>;\n64\t\n65\t // --- Table 3: aliases ---\n66\t\n67\t /// Create a new alias.\n68\t fn create_alias(&self, alias: &NewAlias) -> Result<()>;\n69\t\n70\t /// Get an alias by name.\n71\t fn get_alias(&self, name: &str) -> Result>;\n72\t\n73\t /// Flip a single alias to a new current_uid, recording history.\n74\t fn flip_alias(&self, name: &str, new_uid: &str, history_retention: usize) -> Result;\n75\t\n76\t /// Delete an alias.\n77\t fn delete_alias(&self, name: &str) -> Result;\n78\t\n79\t /// List all aliases.\n80\t fn list_aliases(&self) -> Result>;\n81\t\n82\t // --- Table 4: sessions ---\n83\t\n84\t /// Create or replace a session.\n85\t fn upsert_session(&self, session: &SessionRow) -> Result<()>;\n86\t\n87\t /// Get a session by id.\n88\t fn get_session(&self, session_id: &str) -> Result>;\n89\t\n90\t /// Delete expired sessions.\n91\t fn delete_expired_sessions(&self, now_ms: i64) -> Result;\n92\t\n93\t // --- Table 5: idempotency_cache ---\n94\t\n95\t /// Insert an idempotency cache entry.\n96\t fn insert_idempotency_entry(&self, entry: &IdempotencyEntry) -> Result<()>;\n97\t\n98\t /// Look up an idempotency entry by key.\n99\t fn get_idempotency_entry(&self, key: &str) -> Result>;\n100\t\n101\t /// Delete expired entries.\n102\t fn delete_expired_idempotency_entries(&self, now_ms: i64) -> Result;\n103\t\n104\t // --- Table 6: jobs ---\n105\t\n106\t /// Insert a new job.\n107\t fn insert_job(&self, job: &NewJob) -> Result<()>;\n108\t\n109\t /// Get a job by id.\n110\t fn get_job(&self, id: &str) -> Result>;\n111\t\n112\t /// Claim a queued job (CAS: only if still queued).\n113\t fn claim_job(&self, id: &str, claimed_by: &str, claim_expires_at: i64) -> Result;\n114\t\n115\t /// Update job state and progress.\n116\t fn update_job_progress(&self, id: &str, state: &str, progress: &str) -> Result;\n117\t\n118\t /// Renew a job claim (heartbeat).\n119\t fn renew_job_claim(&self, id: &str, claim_expires_at: i64) -> Result;\n120\t\n121\t /// List jobs by state.\n122\t fn list_jobs_by_state(&self, state: &str) -> Result>;\n123\t\n124\t // --- Table 7: leader_lease ---\n125\t\n126\t /// Try to acquire a leader lease (CAS: only if expired or held by us).\n127\t /// `now_ms` is the current time for expiry comparison.\n128\t fn try_acquire_leader_lease(\n129\t &self,\n130\t scope: &str,\n131\t holder: &str,\n132\t expires_at: i64,\n133\t now_ms: i64,\n134\t ) -> Result;\n135\t\n136\t /// Renew a leader lease we already hold.\n137\t fn renew_leader_lease(&self, scope: &str, holder: &str, expires_at: i64) -> Result;\n138\t\n139\t /// Get current lease holder for a scope.\n140\t fn get_leader_lease(&self, scope: &str) -> Result>;\n141\t\n142\t // --- Table 8: canaries ---\n143\t\n144\t /// Create or update a canary.\n145\t fn upsert_canary(&self, canary: &NewCanary) -> Result<()>;\n146\t\n147\t /// Get a canary by id.\n148\t fn get_canary(&self, id: &str) -> Result>;\n149\t\n150\t /// List all canaries.\n151\t fn list_canaries(&self) -> Result>;\n152\t\n153\t /// Delete a canary.\n154\t fn delete_canary(&self, id: &str) -> Result;\n155\t\n156\t // --- Table 9: canary_runs ---\n157\t\n158\t /// Insert a canary run (auto-prunes to run_history_per_canary).\n159\t fn insert_canary_run(&self, run: &NewCanaryRun, run_history_limit: usize) -> Result<()>;\n160\t\n161\t /// Get runs for a canary, most recent first.\n162\t fn get_canary_runs(&self, canary_id: &str, limit: usize) -> Result>;\n163\t\n164\t // --- Table 10: cdc_cursors ---\n165\t\n166\t /// Upsert a CDC cursor for (sink_name, index_uid).\n167\t fn upsert_cdc_cursor(&self, cursor: &NewCdcCursor) -> Result<()>;\n168\t\n169\t /// Get a CDC cursor by (sink_name, index_uid).\n170\t fn get_cdc_cursor(&self, sink_name: &str, index_uid: &str) -> Result>;\n171\t\n172\t /// List all CDC cursors for a sink.\n173\t fn list_cdc_cursors(&self, sink_name: &str) -> Result>;\n174\t\n175\t // --- Table 11: tenant_map ---\n176\t\n177\t /// Insert a tenant mapping.\n178\t fn insert_tenant_mapping(&self, mapping: &NewTenantMapping) -> Result<()>;\n179\t\n180\t /// Get tenant mapping by API key hash.\n181\t fn get_tenant_mapping(&self, api_key_hash: &[u8]) -> Result>;\n182\t\n183\t /// Delete a tenant mapping.\n184\t fn delete_tenant_mapping(&self, api_key_hash: &[u8]) -> Result;\n185\t\n186\t // --- Table 12: rollover_policies ---\n187\t\n188\t /// Create or update a rollover policy.\n189\t fn upsert_rollover_policy(&self, policy: &NewRolloverPolicy) -> Result<()>;\n190\t\n191\t /// Get a rollover policy by name.\n192\t fn get_rollover_policy(&self, name: &str) -> Result>;\n193\t\n194\t /// List all rollover policies.\n195\t fn list_rollover_policies(&self) -> Result>;\n196\t\n197\t /// Delete a rollover policy.\n198\t fn delete_rollover_policy(&self, name: &str) -> Result;\n199\t\n200\t // --- Table 13: search_ui_config ---\n201\t\n202\t /// Set search UI config for an index.\n203\t fn upsert_search_ui_config(&self, config: &NewSearchUiConfig) -> Result<()>;\n204\t\n205\t /// Get search UI config for an index.\n206\t fn get_search_ui_config(&self, index_uid: &str) -> Result>;\n207\t\n208\t /// Delete search UI config for an index.\n209\t fn delete_search_ui_config(&self, index_uid: &str) -> Result;\n210\t\n211\t // --- Table 14: admin_sessions ---\n212\t\n213\t /// Create an admin session.\n214\t fn insert_admin_session(&self, session: &NewAdminSession) -> Result<()>;\n215\t\n216\t /// Get an admin session by id.\n217\t fn get_admin_session(&self, session_id: &str) -> Result>;\n218\t\n219\t /// Revoke a session (logout).\n220\t fn revoke_admin_session(&self, session_id: &str) -> Result;\n221\t\n222\t /// Delete expired and revoked sessions (lazy eviction + pruner).\n223\t fn delete_expired_admin_sessions(&self, now_ms: i64) -> Result;\n224\t}\n225\t\n226\t// --- Row types ---\n227\t\n228\t/// New task to insert (table 1).\n229\t#[derive(Debug, Clone)]\n230\tpub struct NewTask {\n231\t pub miroir_id: String,\n232\t pub created_at: i64,\n233\t pub status: String,\n234\t pub node_tasks: HashMap,\n235\t pub error: Option,\n236\t pub started_at: Option,\n237\t pub finished_at: Option,\n238\t pub index_uid: Option,\n239\t pub task_type: Option,\n240\t pub node_errors: HashMap,\n241\t}\n242\t\n243\t/// Task row from the DB (table 1).\n244\t#[derive(Debug, Clone)]\n245\tpub struct TaskRow {\n246\t pub miroir_id: String,\n247\t pub created_at: i64,\n248\t pub status: String,\n249\t pub node_tasks: HashMap,\n250\t pub error: Option,\n251\t pub started_at: Option,\n252\t pub finished_at: Option,\n253\t pub index_uid: Option,\n254\t pub task_type: Option,\n255\t pub node_errors: HashMap,\n256\t}\n257\t\n258\t/// Node settings version row (table 2).\n259\t#[derive(Debug, Clone)]\n260\tpub struct NodeSettingsVersionRow {\n261\t pub index_uid: String,\n262\t pub node_id: String,\n263\t pub version: i64,\n264\t pub updated_at: i64,\n265\t}\n266\t\n267\t/// New alias to create (table 3).\n268\t#[derive(Debug, Clone)]\n269\tpub struct NewAlias {\n270\t pub name: String,\n271\t pub kind: String,\n272\t pub current_uid: Option,\n273\t pub target_uids: Option>,\n274\t pub version: i64,\n275\t pub created_at: i64,\n276\t pub history: Vec,\n277\t}\n278\t\n279\t/// Alias row from the DB (table 3).\n280\t#[derive(Debug, Clone)]\n281\tpub struct AliasRow {\n282\t pub name: String,\n283\t pub kind: String,\n284\t pub current_uid: Option,\n285\t pub target_uids: Option>,\n286\t pub version: i64,\n287\t pub created_at: i64,\n288\t pub history: Vec,\n289\t}\n290\t\n291\t/// A single entry in alias history.\n292\t#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]\n293\tpub struct AliasHistoryEntry {\n294\t pub uid: String,\n295\t pub flipped_at: i64,\n296\t}\n297\t\n298\t/// Session row (table 4).\n299\t#[derive(Debug, Clone)]\n300\tpub struct SessionRow {\n301\t pub session_id: String,\n302\t pub last_write_mtask_id: Option,\n303\t pub last_write_at: Option,\n304\t pub pinned_group: Option,\n305\t pub min_settings_version: i64,\n306\t pub ttl: i64,\n307\t}\n308\t\n309\t/// Idempotency cache entry (table 5).\n310\t#[derive(Debug, Clone)]\n311\tpub struct IdempotencyEntry {\n312\t pub key: String,\n313\t pub body_sha256: Vec,\n314\t pub miroir_task_id: String,\n315\t pub expires_at: i64,\n316\t}\n317\t\n318\t/// New job to insert (table 6).\n319\t#[derive(Debug, Clone)]\n320\tpub struct NewJob {\n321\t pub id: String,\n322\t pub type_: String,\n323\t pub params: String,\n324\t pub state: String,\n325\t pub progress: String,\n326\t}\n327\t\n328\t/// Job row from the DB (table 6).\n329\t#[derive(Debug, Clone)]\n330\tpub struct JobRow {\n331\t pub id: String,\n332\t pub type_: String,\n333\t pub params: String,\n334\t pub state: String,\n335\t pub claimed_by: Option,\n336\t pub claim_expires_at: Option,\n337\t pub progress: String,\n338\t}\n339\t\n340\t/// Leader lease row (table 7).\n341\t#[derive(Debug, Clone)]\n342\tpub struct LeaderLeaseRow {\n343\t pub scope: String,\n344\t pub holder: String,\n345\t pub expires_at: i64,\n346\t}\n347\t\n348\t/// Filter for listing tasks.\n349\t#[derive(Debug, Clone, Default)]\n350\tpub struct TaskFilter {\n351\t pub status: Option,\n352\t pub index_uid: Option,\n353\t pub task_type: Option,\n354\t pub limit: Option,\n355\t pub offset: Option,\n356\t}\n357\t\n358\t// --- Tables 8-14 row types (feature-flagged) ---\n359\t\n360\t/// Canary definition row (table 8).\n361\t#[derive(Debug, Clone)]\n362\tpub struct CanaryRow {\n363\t pub id: String,\n364\t pub name: String,\n365\t pub index_uid: String,\n366\t pub interval_s: i64,\n367\t pub query_json: String,\n368\t pub assertions_json: String,\n369\t pub enabled: bool,\n370\t pub created_at: i64,\n371\t}\n372\t\n373\t/// New or updated canary (table 8).\n374\t#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]\n375\tpub struct NewCanary {\n376\t pub id: String,\n377\t pub name: String,\n378\t pub index_uid: String,\n379\t pub interval_s: i64,\n380\t pub query_json: String,\n381\t pub assertions_json: String,\n382\t pub enabled: bool,\n383\t pub created_at: i64,\n384\t}\n385\t\n386\t/// Canary run row (table 9).\n387\t#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]\n388\tpub struct CanaryRunRow {\n389\t pub canary_id: String,\n390\t pub ran_at: i64,\n391\t pub status: String,\n392\t pub latency_ms: i64,\n393\t pub failed_assertions_json: Option,\n394\t}\n395\t\n396\t/// New canary run to insert (table 9).\n397\t#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]\n398\tpub struct NewCanaryRun {\n399\t pub canary_id: String,\n400\t pub ran_at: i64,\n401\t pub status: String,\n402\t pub latency_ms: i64,\n403\t pub failed_assertions_json: Option,\n404\t}\n405\t\n406\t/// CDC cursor row (table 10).\n407\t#[derive(Debug, Clone)]\n408\tpub struct CdcCursorRow {\n409\t pub sink_name: String,\n410\t pub index_uid: String,\n411\t pub last_event_seq: i64,\n412\t pub updated_at: i64,\n413\t}\n414\t\n415\t/// New or updated CDC cursor (table 10).\n416\t#[derive(Debug, Clone)]\n417\tpub struct NewCdcCursor {\n418\t pub sink_name: String,\n419\t pub index_uid: String,\n420\t pub last_event_seq: i64,\n421\t pub updated_at: i64,\n422\t}\n423\t\n424\t/// Tenant map row (table 11).\n425\t#[derive(Debug, Clone)]\n426\tpub struct TenantMapRow {\n427\t pub api_key_hash: Vec,\n428\t pub tenant_id: String,\n429\t pub group_id: Option,\n430\t}\n431\t\n432\t/// New tenant mapping (table 11).\n433\t#[derive(Debug, Clone)]\n434\tpub struct NewTenantMapping {\n435\t pub api_key_hash: Vec,\n436\t pub tenant_id: String,\n437\t pub group_id: Option,\n438\t}\n439\t\n440\t/// Rollover policy row (table 12).\n441\t#[derive(Debug, Clone)]\n442\tpub struct RolloverPolicyRow {\n443\t pub name: String,\n444\t pub write_alias: String,\n445\t pub read_alias: String,\n446\t pub pattern: String,\n447\t pub triggers_json: String,\n448\t pub retention_json: String,\n449\t pub template_json: String,\n450\t pub enabled: bool,\n451\t}\n452\t\n453\t/// New or updated rollover policy (table 12).\n454\t#[derive(Debug, Clone)]\n455\tpub struct NewRolloverPolicy {\n456\t pub name: String,\n457\t pub write_alias: String,\n458\t pub read_alias: String,\n459\t pub pattern: String,\n460\t pub triggers_json: String,\n461\t pub retention_json: String,\n462\t pub template_json: String,\n463\t pub enabled: bool,\n464\t}\n465\t\n466\t/// Search UI config row (table 13).\n467\t#[derive(Debug, Clone)]\n468\tpub struct SearchUiConfigRow {\n469\t pub index_uid: String,\n470\t pub config_json: String,\n471\t pub updated_at: i64,\n472\t}\n473\t\n474\t/// New or updated search UI config (table 13).\n475\t#[derive(Debug, Clone)]\n476\tpub struct NewSearchUiConfig {\n477\t pub index_uid: String,\n478\t pub config_json: String,\n479\t pub updated_at: i64,\n480\t}\n481\t\n482\t/// Admin session row (table 14).\n483\t#[derive(Debug, Clone)]\n484\tpub struct AdminSessionRow {\n485\t pub session_id: String,\n486\t pub csrf_token: String,\n487\t pub admin_key_hash: String,\n488\t pub created_at: i64,\n489\t pub expires_at: i64,\n490\t pub revoked: bool,\n491\t pub user_agent: Option,\n492\t pub source_ip: Option,\n493\t}\n494\t\n495\t/// New admin session (table 14).\n496\t#[derive(Debug, Clone)]\n497\tpub struct NewAdminSession {\n498\t pub session_id: String,\n499\t pub csrf_token: String,\n500\t pub admin_key_hash: String,\n501\t pub created_at: i64,\n502\t pub expires_at: i64,\n503\t pub user_agent: Option,\n504\t pub source_ip: Option,\n505\t}\n506\t"}]},"parent_tool_use_id":"call_d8ab3450251e405481f12a94","session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","uuid":"06105ae3-cdde-431f-878e-ec2427217ecc","timestamp":"2026-05-23T05:57:07.242Z"} -{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_57215398828e4a76a2bedcaa","type":"tool_result","content":"1\t//! Background TTL pruner for the tasks table (plan §4, Phase 3).\n2\t//!\n3\t//! Runs on a configurable interval, acquires an advisory lock via the\n4\t//! `leader_lease` table, and batch-deletes terminal tasks older than\n5\t//! `task_registry.ttl_seconds`. Phase 6 §14.5 Mode A replaces the\n6\t//! single-pod advisory lock with rendezvous-partitioned ownership.\n7\t\n8\tuse crate::config::TaskRegistryConfig;\n9\tuse crate::task_store::TaskStore;\n10\tuse std::sync::atomic::{AtomicU64, Ordering};\n11\tuse std::sync::Arc;\n12\tuse std::thread;\n13\tuse std::time::{Duration, Instant};\n14\tuse tracing::{debug, error, info, warn};\n15\t\n16\t/// Prometheus-style gauge exposed per plan §10.\n17\t/// Updated by the pruner after each cycle.\n18\tstatic TASK_REGISTRY_SIZE: AtomicU64 = AtomicU64::new(0);\n19\t\n20\t/// Read the current `miroir_task_registry_size` gauge value.\n21\tpub fn task_registry_size() -> u64 {\n22\t TASK_REGISTRY_SIZE.load(Ordering::Relaxed)\n23\t}\n24\t\n25\t/// Advisory lock scope used by the pruner.\n26\tconst LOCK_SCOPE: &str = \"pruner:task_ttl\";\n27\t\n28\t/// Holder identity for this pruner instance.\n29\tfn holder_id() -> String {\n30\t format!(\"pruner-{}\", std::process::id())\n31\t}\n32\t\n33\t/// Run a single pruner iteration. Returns the number of tasks deleted.\n34\t///\n35\t/// 1. Try to acquire the advisory lock (leader_lease).\n36\t/// 2. Compute cutoff = now - ttl_seconds.\n37\t/// 3. Batch-delete terminal tasks older than cutoff.\n38\t/// 4. Update the `miroir_task_registry_size` gauge.\n39\t/// 5. Release the lock.\n40\tpub fn prune_once(store: &dyn TaskStore, cfg: &TaskRegistryConfig) -> usize {\n41\t let holder = holder_id();\n42\t let now = now_ms();\n43\t let lease_duration_ms = (cfg.prune_interval_s * 1000) + 30_000; // interval + 30s buffer\n44\t let expires_at = now + lease_duration_ms as i64;\n45\t\n46\t // Step 1: advisory lock\n47\t let acquired = match store.try_acquire_leader_lease(LOCK_SCOPE, &holder, expires_at, now) {\n48\t Ok(true) => true,\n49\t Ok(false) => {\n50\t debug!(\"pruner: another instance holds the lock, skipping\");\n51\t return 0;\n52\t }\n53\t Err(e) => {\n54\t error!(\"pruner: failed to acquire lock: {e}\");\n55\t return 0;\n56\t }\n57\t };\n58\t\n59\t let result = prune_inner(store, cfg);\n60\t\n61\t // Release lock\n62\t if acquired {\n63\t if let Err(e) = store.renew_leader_lease(LOCK_SCOPE, &holder, now) {\n64\t warn!(\"pruner: failed to release lock: {e}\");\n65\t }\n66\t }\n67\t\n68\t result\n69\t}\n70\t\n71\tfn prune_inner(store: &dyn TaskStore, cfg: &TaskRegistryConfig) -> usize {\n72\t let now = now_ms();\n73\t let cutoff = now - (cfg.ttl_seconds * 1000) as i64;\n74\t\n75\t debug!(\"pruner: running with cutoff={cutoff}, batch_size={}\", cfg.prune_batch_size);\n76\t\n77\t let mut total_deleted = 0usize;\n78\t loop {\n79\t match store.prune_tasks(cutoff, cfg.prune_batch_size) {\n80\t Ok(deleted) => {\n81\t total_deleted += deleted;\n82\t if deleted < cfg.prune_batch_size as usize {\n83\t break; // no more rows to prune\n84\t }\n85\t }\n86\t Err(e) => {\n87\t error!(\"pruner: delete batch failed: {e}\");\n88\t break;\n89\t }\n90\t }\n91\t }\n92\t\n93\t // Update gauge\n94\t match store.task_count() {\n95\t Ok(count) => {\n96\t TASK_REGISTRY_SIZE.store(count, Ordering::Relaxed);\n97\t info!(\"pruner: deleted {total_deleted} tasks, registry_size={count}\");\n98\t }\n99\t Err(e) => {\n100\t error!(\"pruner: failed to count tasks: {e}\");\n101\t }\n102\t }\n103\t\n104\t total_deleted\n105\t}\n106\t\n107\t/// Spawn a background thread that runs `prune_once` on a fixed interval.\n108\t///\n109\t/// Call this once at startup. The thread is daemon-like: it exits when\n110\t/// the returned `PrunerHandle` is dropped or the process exits.\n111\tpub fn spawn_pruner(\n112\t store: Arc,\n113\t cfg: TaskRegistryConfig,\n114\t) -> PrunerHandle {\n115\t let interval = Duration::from_secs(cfg.prune_interval_s);\n116\t let stop = std::sync::atomic::AtomicBool::new(false);\n117\t let stop_flag = Arc::new(stop);\n118\t\n119\t let flag_ref = Arc::clone(&stop_flag);\n120\t let handle = thread::Builder::new()\n121\t .name(\"miroir-task-pruner\".into())\n122\t .spawn(move || {\n123\t info!(\"pruner: starting with interval={}s ttl={}s\", cfg.prune_interval_s, cfg.ttl_seconds);\n124\t loop {\n125\t if flag_ref.load(Ordering::Relaxed) {\n126\t info!(\"pruner: stopping\");\n127\t break;\n128\t }\n129\t let start = Instant::now();\n130\t prune_once(store.as_ref(), &cfg);\n131\t let elapsed = start.elapsed();\n132\t if elapsed < interval {\n133\t // Sleep in small increments to check stop flag\n134\t let remaining = interval - elapsed;\n135\t let check_interval = Duration::from_secs(1);\n136\t let mut slept = Duration::ZERO;\n137\t while slept < remaining {\n138\t if flag_ref.load(Ordering::Relaxed) {\n139\t info!(\"pruner: stopping during sleep\");\n140\t return;\n141\t }\n142\t let sleep_dur = remaining - slept;\n143\t let sleep_dur = sleep_dur.min(check_interval);\n144\t thread::sleep(sleep_dur);\n145\t slept += sleep_dur;\n146\t }\n147\t }\n148\t }\n149\t })\n150\t .expect(\"failed to spawn pruner thread\");\n151\t\n152\t PrunerHandle {\n153\t handle: Some(handle),\n154\t stop_flag,\n155\t }\n156\t}\n157\t\n158\t/// Handle to the background pruner thread. Dropping this signals the\n159\t/// pruner to stop and joins the thread.\n160\tpub struct PrunerHandle {\n161\t handle: Option>,\n162\t stop_flag: Arc,\n163\t}\n164\t\n165\timpl PrunerHandle {\n166\t /// Signal the pruner to stop and wait for it to finish.\n167\t pub fn stop(&mut self) {\n168\t self.stop_flag.store(true, Ordering::Relaxed);\n169\t if let Some(h) = self.handle.take() {\n170\t let _ = h.join();\n171\t }\n172\t }\n173\t}\n174\t\n175\timpl Drop for PrunerHandle {\n176\t fn drop(&mut self) {\n177\t self.stop();\n178\t }\n179\t}\n180\t\n181\tfn now_ms() -> i64 {\n182\t std::time::SystemTime::now()\n183\t .duration_since(std::time::UNIX_EPOCH)\n184\t .unwrap()\n185\t .as_millis() as i64\n186\t}\n187\t\n188\t#[cfg(test)]\n189\tmod tests {\n190\t use super::*;\n191\t use crate::config::TaskRegistryConfig;\n192\t use crate::task_store::{NewTask, SqliteTaskStore, TaskStore};\n193\t use std::collections::HashMap;\n194\t use std::sync::Mutex;\n195\t\n196\t /// Serialize tests that read/write the global `TASK_REGISTRY_SIZE` gauge.\n197\t static GAUGE_LOCK: Mutex<()> = Mutex::new(());\n198\t\n199\t fn test_store() -> SqliteTaskStore {\n200\t let store = SqliteTaskStore::open_in_memory().unwrap();\n201\t store.migrate().unwrap();\n202\t store\n203\t }\n204\t\n205\t fn default_cfg() -> TaskRegistryConfig {\n206\t TaskRegistryConfig::default()\n207\t }\n208\t\n209\t /// Helper: insert a task with given id, created_at, status.\n210\t fn insert_task(store: &dyn TaskStore, id: &str, created_at: i64, status: &str) {\n211\t store\n212\t .insert_task(&NewTask {\n213\t miroir_id: id.to_string(),\n214\t created_at,\n215\t status: status.to_string(),\n216\t node_tasks: HashMap::new(),\n217\t error: None,\n218\t started_at: None,\n219\t finished_at: None,\n220\t index_uid: None,\n221\t task_type: None,\n222\t node_errors: HashMap::new(),\n223\t })\n224\t .unwrap();\n225\t }\n226\t\n227\t /// Helper: return current time in ms.\n228\t fn now() -> i64 {\n229\t std::time::SystemTime::now()\n230\t .duration_since(std::time::UNIX_EPOCH)\n231\t .unwrap()\n232\t .as_millis() as i64\n233\t }\n234\t\n235\t /// Acceptance: After insert of 10k terminal tasks with created_at = now - 8d,\n236\t /// next pruner cycle drops all 10k.\n237\t #[test]\n238\t fn pruner_deletes_10k_old_terminal_tasks() {\n239\t let _lock = GAUGE_LOCK.lock().unwrap_or_else(|e| e.into_inner());\n240\t let store = test_store();\n241\t let eight_days_ms: i64 = 8 * 24 * 3600 * 1000;\n242\t let old_time = now() - eight_days_ms;\n243\t\n244\t // Insert 10k terminal tasks at old_time\n245\t for i in 0..10_000 {\n246\t let status = match i % 3 {\n247\t 0 => \"succeeded\",\n248\t 1 => \"failed\",\n249\t _ => \"canceled\",\n250\t };\n251\t insert_task(&store, &format!(\"old-{i}\"), old_time, status);\n252\t }\n253\t\n254\t assert_eq!(store.task_count().unwrap(), 10_000);\n255\t\n256\t let mut cfg = default_cfg();\n257\t cfg.ttl_seconds = 7 * 24 * 3600; // 7 days\n258\t let deleted = prune_once(&store, &cfg);\n259\t\n260\t assert_eq!(deleted, 10_000);\n261\t assert_eq!(store.task_count().unwrap(), 0);\n262\t assert_eq!(task_registry_size(), 0);\n263\t }\n264\t\n265\t /// Acceptance: A single in-flight `processing` task at created_at = now - 10d is preserved.\n266\t #[test]\n267\t fn pruner_preserves_processing_tasks() {\n268\t let _lock = GAUGE_LOCK.lock().unwrap_or_else(|e| e.into_inner());\n269\t let store = test_store();\n270\t let ten_days_ms: i64 = 10 * 24 * 3600 * 1000;\n271\t let old_time = now() - ten_days_ms;\n272\t\n273\t // Insert an old processing task\n274\t insert_task(&store, \"processing-old\", old_time, \"processing\");\n275\t\n276\t // Also insert old terminal tasks that should be deleted\n277\t insert_task(&store, \"succeeded-old\", old_time, \"succeeded\");\n278\t insert_task(&store, \"failed-old\", old_time, \"failed\");\n279\t\n280\t assert_eq!(store.task_count().unwrap(), 3);\n281\t\n282\t let cfg = default_cfg();\n283\t let deleted = prune_once(&store, &cfg);\n284\t\n285\t assert_eq!(deleted, 2);\n286\t assert!(store.get_task(\"processing-old\").unwrap().is_some());\n287\t assert!(store.get_task(\"succeeded-old\").unwrap().is_none());\n288\t assert!(store.get_task(\"failed-old\").unwrap().is_none());\n289\t assert_eq!(store.task_count().unwrap(), 1);\n290\t }\n291\t\n292\t /// Acceptance: Pruner advisory lock prevents two instances pruning simultaneously.\n293\t #[test]\n294\t fn advisory_lock_prevents_concurrent_pruning() {\n295\t let _lock = GAUGE_LOCK.lock().unwrap_or_else(|e| e.into_inner());\n296\t let store = test_store();\n297\t let ten_days_ms: i64 = 10 * 24 * 3600 * 1000;\n298\t let old_time = now() - ten_days_ms;\n299\t\n300\t // Insert old tasks\n301\t for i in 0..100 {\n302\t insert_task(&store, &format!(\"old-{i}\"), old_time, \"succeeded\");\n303\t }\n304\t\n305\t let cfg = default_cfg();\n306\t\n307\t // Manually acquire the lock as another instance\n308\t let now = std::time::SystemTime::now()\n309\t .duration_since(std::time::UNIX_EPOCH)\n310\t .unwrap()\n311\t .as_millis() as i64;\n312\t let other_holder = \"other-pruner-999\";\n313\t store\n314\t .try_acquire_leader_lease(LOCK_SCOPE, other_holder, now + 600_000, now)\n315\t .unwrap();\n316\t\n317\t // prune_once should see the lock held and skip\n318\t let deleted = prune_once(&store, &cfg);\n319\t assert_eq!(deleted, 0);\n320\t // Tasks should still be there\n321\t assert_eq!(store.task_count().unwrap(), 100);\n322\t }\n323\t\n324\t /// Acceptance: miroir_task_registry_size gauge drops after a prune cycle.\n325\t #[test]\n326\t fn gauge_drops_after_prune() {\n327\t let _lock = GAUGE_LOCK.lock().unwrap_or_else(|e| e.into_inner());\n328\t let store = test_store();\n329\t let ten_days_ms: i64 = 10 * 24 * 3600 * 1000;\n330\t let old_time = now() - ten_days_ms;\n331\t\n332\t // Insert 5 old + 5 recent tasks\n333\t for i in 0..5 {\n334\t insert_task(&store, &format!(\"old-{i}\"), old_time, \"succeeded\");\n335\t }\n336\t for i in 0..5 {\n337\t insert_task(&store, &format!(\"new-{i}\"), now(), \"succeeded\");\n338\t }\n339\t\n340\t assert_eq!(store.task_count().unwrap(), 10);\n341\t\n342\t let cfg = default_cfg();\n343\t prune_once(&store, &cfg);\n344\t\n345\t // Gauge should reflect remaining tasks\n346\t assert_eq!(task_registry_size(), 5);\n347\t assert_eq!(store.task_count().unwrap(), 5);\n348\t }\n349\t\n350\t /// Test that pruner respects batch_size — multiple iterations needed.\n351\t #[test]\n352\t fn pruner_batches_correctly() {\n353\t let _lock = GAUGE_LOCK.lock().unwrap_or_else(|e| e.into_inner());\n354\t let store = test_store();\n355\t let ten_days_ms: i64 = 10 * 24 * 3600 * 1000;\n356\t let old_time = now() - ten_days_ms;\n357\t\n358\t for i in 0..25 {\n359\t insert_task(&store, &format!(\"old-{i}\"), old_time, \"succeeded\");\n360\t }\n361\t\n362\t let mut cfg = default_cfg();\n363\t cfg.prune_batch_size = 10; // small batch\n364\t let deleted = prune_once(&store, &cfg);\n365\t\n366\t assert_eq!(deleted, 25); // all deleted via multiple batches\n367\t assert_eq!(store.task_count().unwrap(), 0);\n368\t }\n369\t\n370\t /// Acceptance: spawn_pruner runs in background, PrunerHandle::stop joins cleanly.\n371\t #[test]\n372\t fn spawn_pruner_runs_and_stops() {\n373\t let _lock = GAUGE_LOCK.lock().unwrap_or_else(|e| e.into_inner());\n374\t let store = Arc::new(test_store());\n375\t let ten_days_ms: i64 = 10 * 24 * 3600 * 1000;\n376\t let old_time = now() - ten_days_ms;\n377\t\n378\t for i in 0..5 {\n379\t insert_task(store.as_ref(), &format!(\"old-{i}\"), old_time, \"succeeded\");\n380\t }\n381\t\n382\t let mut cfg = default_cfg();\n383\t cfg.prune_interval_s = 1;\n384\t let mut handle = spawn_pruner(store.clone(), cfg);\n385\t\n386\t // Give the pruner a moment to run at least one cycle\n387\t thread::sleep(Duration::from_millis(200));\n388\t handle.stop();\n389\t\n390\t // Old tasks should be pruned\n391\t assert_eq!(store.task_count().unwrap(), 0);\n392\t }\n393\t\n394\t /// Acceptance: dropping PrunerHandle signals stop and joins.\n395\t #[test]\n396\t fn pruner_handle_drop_stops_thread() {\n397\t let _lock = GAUGE_LOCK.lock().unwrap_or_else(|e| e.into_inner());\n398\t let store = Arc::new(test_store());\n399\t let mut cfg = default_cfg();\n400\t cfg.prune_interval_s = 600; // long interval so it sleeps in the loop\n401\t {\n402\t let _handle = spawn_pruner(store, cfg);\n403\t // handle dropped here\n404\t }\n405\t // Thread should have stopped — if this hangs, the test will time out\n406\t }\n407\t}\n408\t"}]},"parent_tool_use_id":"call_d8ab3450251e405481f12a94","session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","uuid":"2143cd10-64a6-4615-be88-5e070069915f","timestamp":"2026-05-23T05:57:07.244Z"} -{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_a045d077dec84636b1d8c47d","type":"tool_result","content":"1\t//! Rendezvous hash-based routing and shard assignment.\n2\t\n3\tuse crate::migration::{MigrationCoordinator, ShardId};\n4\tuse crate::topology::{Group, NodeId, Topology};\n5\tuse std::collections::HashSet;\n6\tuse std::hash::{Hash, Hasher};\n7\tuse twox_hash::XxHash64;\n8\t\n9\t/// Compute a rendezvous score for a shard+node pair.\n10\t///\n11\t/// Higher scores win; used for deterministic shard assignment.\n12\tpub fn score(shard_id: u32, node_id: &str) -> u64 {\n13\t let mut h = XxHash64::with_seed(0);\n14\t shard_id.hash(&mut h);\n15\t node_id.hash(&mut h);\n16\t h.finish()\n17\t}\n18\t\n19\t/// Assign a shard to `rf` nodes within a single replica group.\n20\t///\n21\t/// `group_nodes` is the subset of nodes belonging to that group.\n22\t///\n23\t/// Sorts by score descending, breaking ties lexicographically on node_id\n24\t/// for deterministic resolution.\n25\tpub fn assign_shard_in_group(shard_id: u32, group_nodes: &[NodeId], rf: usize) -> Vec {\n26\t let mut scored: Vec<(u64, &NodeId)> = group_nodes\n27\t .iter()\n28\t .map(|n| (score(shard_id, n.as_str()), n))\n29\t .collect();\n30\t scored.sort_unstable_by(|a, b| {\n31\t b.0.cmp(&a.0)\n32\t .then_with(|| a.1.as_str().cmp(b.1.as_str()))\n33\t });\n34\t scored\n35\t .into_iter()\n36\t .take(rf)\n37\t .map(|(_, n)| n.clone())\n38\t .collect()\n39\t}\n40\t\n41\t/// All write targets for a document: the RF nodes in EACH replica group.\n42\tpub fn write_targets(shard_id: u32, topology: &Topology) -> Vec {\n43\t topology\n44\t .groups()\n45\t .flat_map(|group| assign_shard_in_group(shard_id, group.nodes(), topology.rf()))\n46\t .collect()\n47\t}\n48\t\n49\t/// All write targets for a document, considering dual-write state during migration.\n50\t///\n51\t/// This is the migration-aware version of `write_targets`. When a shard is in\n52\t/// dual-write phase (node addition in progress), it includes both the old owner\n53\t/// AND the new node in the target list to ensure no writes are lost during migration.\n54\t///\n55\t/// # Arguments\n56\t/// * `shard_id` - The shard ID being written to\n57\t/// * `topology` - The cluster topology\n58\t/// * `migration_coordinator` - Optional migration coordinator for dual-write detection\n59\t///\n60\t/// # Returns\n61\t/// A vector of node IDs that should receive the write. During dual-write for a shard,\n62\t/// this includes both the standard RF nodes AND the new node.\n63\tpub fn write_targets_with_migration(\n64\t shard_id: u32,\n65\t topology: &Topology,\n66\t migration_coordinator: Option<&MigrationCoordinator>,\n67\t) -> Vec {\n68\t let shard = ShardId(shard_id);\n69\t\n70\t // Start with standard write targets\n71\t let mut targets: Vec = write_targets(shard_id, topology);\n72\t\n73\t // Check if this shard is in dual-write phase\n74\t if let Some(coordinator) = migration_coordinator {\n75\t if coordinator.is_dual_write_active(shard) {\n76\t // Find migrations affecting this shard\n77\t for (_mid, state) in coordinator.get_all_migrations() {\n78\t if state.affected_shards.contains_key(&shard) {\n79\t // This shard is being migrated - include the new node\n80\t // Convert migration NodeId to topology NodeId\n81\t let new_node_id = crate::topology::NodeId::new(state.new_node.0.clone());\n82\t\n83\t // Only add if not already in targets\n84\t if !targets.contains(&new_node_id) {\n85\t targets.push(new_node_id);\n86\t }\n87\t }\n88\t }\n89\t }\n90\t }\n91\t\n92\t targets\n93\t}\n94\t\n95\t/// Select the replica group for a query (round-robin by query counter).\n96\t///\n97\t/// Returns 0 when there are no replica groups (caller handles the empty case).\n98\tpub fn query_group(query_seq: u64, replica_groups: u32) -> u32 {\n99\t if replica_groups == 0 {\n100\t return 0;\n101\t }\n102\t (query_seq % replica_groups as u64) as u32\n103\t}\n104\t\n105\t/// The covering set for a search: one node per shard within the chosen group.\n106\tpub fn covering_set(shard_count: u32, group: &Group, rf: usize, query_seq: u64) -> Vec {\n107\t (0..shard_count)\n108\t .map(|shard_id| {\n109\t let replicas = assign_shard_in_group(shard_id, group.nodes(), rf);\n110\t // rotate through replicas for intra-group load balancing\n111\t replicas[(query_seq as usize) % replicas.len()].clone()\n112\t })\n113\t .collect::>()\n114\t .into_iter()\n115\t .collect()\n116\t}\n117\t\n118\t/// Covering set with settings version floor filtering (plan §13.5).\n119\t///\n120\t/// Excludes nodes whose settings version for the given index is below `floor`.\n121\t/// Returns None if no covering set can be assembled (caller should return 503).\n122\tpub fn covering_set_with_version_floor(\n123\t shard_count: u32,\n124\t group: &Group,\n125\t rf: usize,\n126\t query_seq: u64,\n127\t index: &str,\n128\t floor: u64,\n129\t version_checker: &impl Fn(&str, &str) -> u64,\n130\t) -> Option> {\n131\t let mut result = Vec::new();\n132\t let mut used_nodes = HashSet::new();\n133\t\n134\t for shard_id in 0..shard_count {\n135\t let replicas = assign_shard_in_group(shard_id, group.nodes(), rf);\n136\t\n137\t // Filter replicas by settings version floor, then by query_seq rotation\n138\t let eligible: Vec<_> = replicas\n139\t .iter()\n140\t .filter(|node_id| {\n141\t let version = version_checker(index, node_id.as_str());\n142\t version >= floor\n143\t })\n144\t .collect();\n145\t\n146\t if eligible.is_empty() {\n147\t // No eligible replica for this shard\n148\t return None;\n149\t }\n150\t\n151\t // Rotate through eligible replicas using query_seq\n152\t let selected = eligible[query_seq as usize % eligible.len()];\n153\t if used_nodes.insert(selected.clone()) {\n154\t result.push(selected.clone());\n155\t }\n156\t }\n157\t\n158\t Some(result)\n159\t}\n160\t\n161\t/// Compute the shard ID for a document's primary key.\n162\tpub fn shard_for_key(primary_key: &str, shard_count: u32) -> u32 {\n163\t let mut h = XxHash64::with_seed(0);\n164\t primary_key.hash(&mut h);\n165\t (h.finish() % shard_count as u64) as u32\n166\t}\n167\t\n168\t/// Count differences between two shard assignments.\n169\t///\n170\t/// Returns the number of shard-node pairs that differ between old and new.\n171\t/// For each shard, counts nodes in new assignment that weren't in old.\n172\tpub fn count_assignment_diff(\n173\t old_shards: &[(u32, Vec)],\n174\t new_shards: &[(u32, Vec)],\n175\t) -> usize {\n176\t let old_map: std::collections::HashMap<_, _> = old_shards\n177\t .iter()\n178\t .map(|(shard, nodes)| (*shard, nodes.clone()))\n179\t .collect();\n180\t\n181\t let mut diff = 0;\n182\t for (shard, new_nodes) in new_shards {\n183\t if let Some(old_nodes) = old_map.get(shard) {\n184\t // Count nodes in new that weren't in old (counts each change once)\n185\t for node in new_nodes {\n186\t if !old_nodes.contains(node) {\n187\t diff += 1;\n188\t }\n189\t }\n190\t }\n191\t }\n192\t diff\n193\t}\n194\t\n195\t#[cfg(test)]\n196\tmod tests {\n197\t use super::*;\n198\t use crate::topology::{Node, NodeId};\n199\t use std::collections::HashMap;\n200\t\n201\t /// Test 1: Determinism — same inputs always produce the same output.\n202\t #[test]\n203\t fn test_determinism() {\n204\t let nodes = vec![\n205\t NodeId::new(\"node-a\".to_string()),\n206\t NodeId::new(\"node-b\".to_string()),\n207\t NodeId::new(\"node-c\".to_string()),\n208\t ];\n209\t\n210\t let reference = (0..100)\n211\t .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes, 2)))\n212\t .collect::>();\n213\t\n214\t // Run 1000 times and compare to reference\n215\t for _ in 0..1000 {\n216\t let current = (0..100)\n217\t .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes, 2)))\n218\t .collect::>();\n219\t\n220\t assert_eq!(reference, current, \"Assignment is non-deterministic\");\n221\t }\n222\t }\n223\t\n224\t /// Test 2: Reshuffle bound on add — 64 shards, 3→4 nodes.\n225\t ///\n226\t /// Expected: at most 2 × (1/4) × 64 = 32 shard-node edges differ.\n227\t #[test]\n228\t fn test_reshuffle_bound_on_add() {\n229\t let shard_count = 64;\n230\t let rf = 2;\n231\t\n232\t let nodes_3 = vec![\n233\t NodeId::new(\"node-a\".to_string()),\n234\t NodeId::new(\"node-b\".to_string()),\n235\t NodeId::new(\"node-c\".to_string()),\n236\t ];\n237\t\n238\t let mut nodes_4 = nodes_3.clone();\n239\t nodes_4.push(NodeId::new(\"node-d\".to_string()));\n240\t\n241\t let old_assignment: Vec<_> = (0..shard_count)\n242\t .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes_3, rf)))\n243\t .collect();\n244\t\n245\t let new_assignment: Vec<_> = (0..shard_count)\n246\t .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes_4, rf)))\n247\t .collect();\n248\t\n249\t let diff = count_assignment_diff(&old_assignment, &new_assignment);\n250\t let max_diff = 2 * (shard_count as f64 / 4.0).ceil() as usize;\n251\t\n252\t assert!(\n253\t diff <= max_diff,\n254\t \"Add reshuffle exceeded bound: {} > {}\",\n255\t diff,\n256\t max_diff\n257\t );\n258\t }\n259\t\n260\t /// Test 3: Reshuffle bound on remove — 64 shards, 4→3 nodes.\n261\t ///\n262\t /// Expected: ~RF × S / Ng edges differ.\n263\t #[test]\n264\t fn test_reshuffle_bound_on_remove() {\n265\t let shard_count = 64;\n266\t let rf = 2;\n267\t\n268\t let nodes_4 = vec![\n269\t NodeId::new(\"node-a\".to_string()),\n270\t NodeId::new(\"node-b\".to_string()),\n271\t NodeId::new(\"node-c\".to_string()),\n272\t NodeId::new(\"node-d\".to_string()),\n273\t ];\n274\t\n275\t let nodes_3 = vec![\n276\t NodeId::new(\"node-a\".to_string()),\n277\t NodeId::new(\"node-b\".to_string()),\n278\t NodeId::new(\"node-c\".to_string()),\n279\t ];\n280\t\n281\t let old_assignment: Vec<_> = (0..shard_count)\n282\t .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes_4, rf)))\n283\t .collect();\n284\t\n285\t let new_assignment: Vec<_> = (0..shard_count)\n286\t .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes_3, rf)))\n287\t .collect();\n288\t\n289\t let diff = count_assignment_diff(&old_assignment, &new_assignment);\n290\t // Expected ~RF × S / Ng = 2 × 64 / 4 = 32\n291\t let expected_diff = (rf * shard_count as usize) / 4;\n292\t\n293\t assert!(\n294\t (diff as isize - expected_diff as isize).abs() <= expected_diff as isize / 2,\n295\t \"Remove reshuffle deviated significantly from expected: {} vs ~{}\",\n296\t diff,\n297\t expected_diff\n298\t );\n299\t }\n300\t\n301\t /// Test 4: Uniformity — 64 shards, 3 nodes, RF=1.\n302\t ///\n303\t /// Expected: each node holds approximately equal shards (18–26 per plan §8 DoD).\n304\t #[test]\n305\t fn test_uniformity() {\n306\t let shard_count = 64;\n307\t let rf = 1;\n308\t\n309\t let nodes = vec![\n310\t NodeId::new(\"node-a\".to_string()),\n311\t NodeId::new(\"node-b\".to_string()),\n312\t NodeId::new(\"node-c\".to_string()),\n313\t ];\n314\t\n315\t let mut shard_counts: HashMap = HashMap::new();\n316\t for node in &nodes {\n317\t shard_counts.insert(node.clone(), 0);\n318\t }\n319\t\n320\t for shard_id in 0..shard_count {\n321\t let assigned = assign_shard_in_group(shard_id, &nodes, rf);\n322\t for node in assigned {\n323\t *shard_counts.entry(node).or_insert(0) += 1;\n324\t }\n325\t }\n326\t\n327\t // Expected per node: 64/3 ≈ 21.3\n328\t // Verified range: 17–26 (XxHash64 with 64 shards / 3 nodes)\n329\t for (node, count) in shard_counts {\n330\t assert!(\n331\t (17..=26).contains(&count),\n332\t \"Node {} has {} shards, expected 17–26\",\n333\t node.as_str(),\n334\t count\n335\t );\n336\t }\n337\t }\n338\t\n339\t /// Test 5: RF=2 placement — minimal change on add/remove.\n340\t #[test]\n341\t fn test_rf2_placement_stability() {\n342\t let shard_count = 64;\n343\t let rf = 2;\n344\t\n345\t let nodes_3 = vec![\n346\t NodeId::new(\"node-a\".to_string()),\n347\t NodeId::new(\"node-b\".to_string()),\n348\t NodeId::new(\"node-c\".to_string()),\n349\t ];\n350\t\n351\t let mut nodes_4 = nodes_3.clone();\n352\t nodes_4.push(NodeId::new(\"node-d\".to_string()));\n353\t\n354\t let old_assignment: Vec<_> = (0..shard_count)\n355\t .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes_3, rf)))\n356\t .collect();\n357\t\n358\t let new_assignment: Vec<_> = (0..shard_count)\n359\t .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes_4, rf)))\n360\t .collect();\n361\t\n362\t let diff = count_assignment_diff(&old_assignment, &new_assignment);\n363\t\n364\t // For RF=2, adding a node should affect at most 2 × (1/4) × 64 = 32 edges\n365\t let max_diff = 2 * (shard_count as f64 / 4.0).ceil() as usize;\n366\t\n367\t assert!(\n368\t diff <= max_diff,\n369\t \"RF=2 placement changed too much on add: {} > {}\",\n370\t diff,\n371\t max_diff\n372\t );\n373\t }\n374\t\n375\t /// Test 6: shard_for_key matches known fixture.\n376\t #[test]\n377\t fn test_shard_for_key_fixture() {\n378\t // Known test vectors computed with: XxHash64::with_seed(0).hash(pk) % shard_count\n379\t let fixtures: Vec<(&str, u32, u32)> = vec![\n380\t (\"user:123\", 64, 46),\n381\t (\"user:456\", 64, 48),\n382\t (\"product:abc\", 64, 24),\n383\t (\"order:xyz\", 64, 10),\n384\t (\"alpha\", 128, 104),\n385\t (\"beta\", 128, 91),\n386\t ];\n387\t\n388\t for (key, shard_count, expected) in fixtures {\n389\t let actual = shard_for_key(key, shard_count);\n390\t assert_eq!(\n391\t actual, expected,\n392\t \"shard_for_key({:?}, {}) = {}, expected {}\",\n393\t key, shard_count, actual, expected\n394\t );\n395\t }\n396\t }\n397\t\n398\t /// Test tie-breaking in assign_shard_in_group.\n399\t #[test]\n400\t fn test_tie_breaking() {\n401\t // Use node IDs that are unlikely but could theoretically collide\n402\t let nodes = vec![\n403\t NodeId::new(\"node-zzz\".to_string()),\n404\t NodeId::new(\"node-aaa\".to_string()),\n405\t ];\n406\t\n407\t let result = assign_shard_in_group(0, &nodes, 1);\n408\t\n409\t // Even if scores were identical (extremely rare), node-aaa should come first\n410\t // because we sort by node_id ascending for ties\n411\t assert_eq!(result.len(), 1);\n412\t // The actual result depends on hash values - we're just verifying determinism\n413\t let result2 = assign_shard_in_group(0, &nodes, 1);\n414\t assert_eq!(result, result2, \"Tie-breaking is non-deterministic\");\n415\t }\n416\t\n417\t /// Test score function uses canonical hash order.\n418\t #[test]\n419\t fn test_score_canonical_order() {\n420\t let node_a = \"node-a\";\n421\t let node_b = \"node-b\";\n422\t\n423\t // Different shard_id → different score\n424\t let score_0_a = score(0, node_a);\n425\t let score_1_a = score(1, node_a);\n426\t assert_ne!(score_0_a, score_1_a, \"Same node, different shard should differ\");\n427\t\n428\t // Different node_id → different score (same shard)\n429\t let score_0_b = score(0, node_b);\n430\t assert_ne!(score_0_a, score_0_b, \"Same shard, different node should differ\");\n431\t\n432\t // Verify determinism\n433\t assert_eq!(score(0, node_a), score_0_a, \"Score is non-deterministic\");\n434\t }\n435\t\n436\t // ── P1.3 acceptance tests: write_targets, query_group, covering_set ───\n437\t\n438\t /// P1.3-A1: write_targets returns exactly RG × RF nodes (counting duplicates).\n439\t #[test]\n440\t fn test_write_targets_returns_rg_x_rf_nodes() {\n441\t let mut topo = Topology::new(64, 3, 2);\n442\t // Add 5 nodes to each of 3 groups\n443\t for i in 0u32..15 {\n444\t let rg = i / 5;\n445\t topo.add_node(Node::new(\n446\t NodeId::new(format!(\"node-{i}\")),\n447\t format!(\"http://node-{i}:7700\"),\n448\t rg,\n449\t ));\n450\t }\n451\t\n452\t let targets = write_targets(0, &topo);\n453\t // RG=3, RF=2 → 6 nodes total (may include duplicates)\n454\t assert_eq!(targets.len(), 6, \"write_targets should return RG × RF nodes\");\n455\t }\n456\t\n457\t /// P1.3-A2: write_targets assigns one-per-group.\n458\t #[test]\n459\t fn test_write_targets_one_per_group() {\n460\t let mut topo = Topology::new(64, 2, 2);\n461\t // Group 0: nodes 0-2, Group 1: nodes 3-5\n462\t for i in 0u32..6 {\n463\t let rg = if i < 3 { 0 } else { 1 };\n464\t topo.add_node(Node::new(\n465\t NodeId::new(format!(\"node-{i}\")),\n466\t format!(\"http://node-{i}:7700\"),\n467\t rg,\n468\t ));\n469\t }\n470\t\n471\t let shard_id = 7;\n472\t let targets = write_targets(shard_id, &topo);\n473\t\n474\t // Verify that the subset in group 0 matches assign_shard_in_group\n475\t let g0 = topo.group(0).unwrap();\n476\t let g0_targets: Vec<_> = targets\n477\t .iter()\n478\t .filter(|n| g0.nodes().contains(n))\n479\t .collect();\n480\t let g0_expected = assign_shard_in_group(shard_id, g0.nodes(), 2);\n481\t assert_eq!(\n482\t g0_targets.len(),\n483\t g0_expected.len(),\n484\t \"Group 0 should have exactly RF nodes\"\n485\t );\n486\t for node in &g0_expected {\n487\t assert!(g0_targets.contains(&node), \"Group 0 missing expected node\");\n488\t }\n489\t\n490\t // Verify that the subset in group 1 matches assign_shard_in_group\n491\t let g1 = topo.group(1).unwrap();\n492\t let g1_targets: Vec<_> = targets\n493\t .iter()\n494\t .filter(|n| g1.nodes().contains(n))\n495\t .collect();\n496\t let g1_expected = assign_shard_in_group(shard_id, g1.nodes(), 2);\n497\t assert_eq!(\n498\t g1_targets.len(),\n499\t g1_expected.len(),\n500\t \"Group 1 should have exactly RF nodes\"\n501\t );\n502\t for node in &g1_expected {\n503\t assert!(g1_targets.contains(&node), \"Group 1 missing expected node\");\n504\t }\n505\t }\n506\t\n507\t /// P1.3-A3: covering_set covers all shards within the chosen group.\n508\t #[test]\n509\t fn test_covering_set_covers_all_shards() {\n510\t let mut topo = Topology::new(16, 1, 2);\n511\t for i in 0u32..4 {\n512\t topo.add_node(Node::new(\n513\t NodeId::new(format!(\"node-{i}\")),\n514\t format!(\"http://node-{i}:7700\"),\n515\t 0,\n516\t ));\n517\t }\n518\t\n519\t let group = topo.group(0).unwrap();\n520\t let shard_count = 16;\n521\t let covering = covering_set(shard_count, group, 2, 0);\n522\t\n523\t // Verify that every shard is represented in the covering set\n524\t for shard_id in 0..shard_count {\n525\t let replicas = assign_shard_in_group(shard_id, group.nodes(), 2);\n526\t let selected = &replicas[0]; // query_seq=0 → first replica\n527\t assert!(\n528\t covering.contains(selected),\n529\t \"Shard {}'s selected node {:?} not in covering set\",\n530\t shard_id,\n531\t selected\n532\t );\n533\t }\n534\t }\n535\t\n536\t /// P1.3-A4: covering_set size is bounded by Ng (nodes in group).\n537\t #[test]\n538\t fn test_covering_set_size_bound() {\n539\t let mut topo = Topology::new(1000, 1, 3);\n540\t for i in 0u32..5 {\n541\t topo.add_node(Node::new(\n542\t NodeId::new(format!(\"node-{i}\")),\n543\t format!(\"http://node-{i}:7700\"),\n544\t 0,\n545\t ));\n546\t }\n547\t\n548\t let group = topo.group(0).unwrap();\n549\t let ng = group.node_count();\n550\t let covering = covering_set(1000, group, 3, 0);\n551\t\n552\t assert!(\n553\t covering.len() <= ng,\n554\t \"covering_set size {} exceeds group node count {}\",\n555\t covering.len(),\n556\t ng\n557\t );\n558\t }\n559\t\n560\t /// P1.3-A5: Two identical Topologies produce identical covering_set outputs.\n561\t #[test]\n562\t fn test_covering_set_determinism() {\n563\t let mut topo1 = Topology::new(64, 2, 2);\n564\t let mut topo2 = Topology::new(64, 2, 2);\n565\t\n566\t for i in 0u32..6 {\n567\t let rg = if i < 3 { 0 } else { 1 };\n568\t let node = Node::new(\n569\t NodeId::new(format!(\"node-{i}\")),\n570\t format!(\"http://node-{i}:7700\"),\n571\t rg,\n572\t );\n573\t topo1.add_node(node.clone());\n574\t topo2.add_node(node);\n575\t }\n576\t\n577\t let g1 = topo1.group(0).unwrap();\n578\t let g2 = topo2.group(0).unwrap();\n579\t\n580\t for query_seq in 0..10 {\n581\t let c1 = covering_set(64, g1, 2, query_seq);\n582\t let c2 = covering_set(64, g2, 2, query_seq);\n583\t // Compare as sets since order may vary due to HashSet iteration\n584\t let s1: std::collections::HashSet<_> = c1.into_iter().collect();\n585\t let s2: std::collections::HashSet<_> = c2.into_iter().collect();\n586\t assert_eq!(\n587\t s1, s2,\n588\t \"covering_set differs for identical topologies at query_seq={}\",\n589\t query_seq\n590\t );\n591\t }\n592\t }\n593\t\n594\t /// P1.3-A6: query_group distribution is uniform (chi-square test).\n595\t #[test]\n596\t fn test_query_group_uniform_distribution() {\n597\t let replica_groups = 5u32;\n598\t let samples = 10_000;\n599\t\n600\t let mut counts = vec![0usize; replica_groups as usize];\n601\t for query_seq in 0..samples {\n602\t let g = query_group(query_seq as u64, replica_groups);\n603\t counts[g as usize] += 1;\n604\t }\n605\t\n606\t // Expected count per group: samples / RG\n607\t let expected = samples as f64 / replica_groups as f64;\n608\t\n609\t // Chi-square statistic: sum((observed - expected)^2 / expected)\n610\t let chi_square: f64 = counts\n611\t .iter()\n612\t .map(|&observed| {\n613\t let diff = observed as f64 - expected;\n614\t (diff * diff) / expected\n615\t })\n616\t .sum();\n617\t\n618\t // Degrees of freedom = RG - 1 = 4\n619\t // Critical value at p=0.95 is ~9.49\n620\t let critical_value = 9.49;\n621\t\n622\t assert!(\n623\t chi_square < critical_value,\n624\t \"query_group distribution not uniform: chi-square={} > {}\",\n625\t chi_square,\n626\t critical_value\n627\t );\n628\t }\n629\t\n630\t /// P1.3-A7: covering_set rotates replicas by query_seq.\n631\t #[test]\n632\t fn test_covering_set_rotates_replicas() {\n633\t let mut topo = Topology::new(8, 1, 3);\n634\t for i in 0u32..4 {\n635\t topo.add_node(Node::new(\n636\t NodeId::new(format!(\"node-{i}\")),\n637\t format!(\"http://node-{i}:7700\"),\n638\t 0,\n639\t ));\n640\t }\n641\t\n642\t let group = topo.group(0).unwrap();\n643\t let c0 = covering_set(8, group, 3, 0);\n644\t let c1 = covering_set(8, group, 3, 1);\n645\t let c2 = covering_set(8, group, 3, 2);\n646\t\n647\t // For each shard, verify that the selected node rotates\n648\t for shard_id in 0..8 {\n649\t let replicas = assign_shard_in_group(shard_id, group.nodes(), 3);\n650\t let r0 = &replicas[0];\n651\t let r1 = &replicas[1];\n652\t let r2 = &replicas[2];\n653\t\n654\t assert!(c0.contains(r0), \"query_seq=0 should select first replica\");\n655\t assert!(c1.contains(r1), \"query_seq=1 should select second replica\");\n656\t assert!(c2.contains(r2), \"query_seq=2 should select third replica\");\n657\t }\n658\t }\n659\t}\n660\t"}]},"parent_tool_use_id":"call_d8ab3450251e405481f12a94","session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","uuid":"bfd3bfc2-d044-41e9-9426-59f695cd3e5d","timestamp":"2026-05-23T05:57:07.245Z"} -{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_afff3cf7c16a4f509cd4c814","type":"tool_result","content":"1\tuse axum::{http::StatusCode, Json};\n2\tuse serde::Serialize;\n3\t\n4\t#[derive(Serialize)]\n5\tpub struct HealthResponse {\n6\t status: String,\n7\t}\n8\t\n9\tpub async fn get_health() -> Result, StatusCode> {\n10\t Ok(Json(HealthResponse {\n11\t status: \"available\".to_string(),\n12\t }))\n13\t}\n14\t"}]},"parent_tool_use_id":"call_d8ab3450251e405481f12a94","session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","uuid":"23002ff7-b9ce-41a8-8199-078e488d8b2c","timestamp":"2026-05-23T05:57:07.246Z"} -{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_2ccbd63a770348ceb05b2c3c","type":"tool_result","content":"1\t//! Cluster rebalancer for elastic topology operations.\n2\t//!\n3\t//! Implements plan §2 topology changes and §4 rebalancer:\n4\t//! - Node addition (within a group)\n5\t//! - Replica-group addition\n6\t//! - Node removal (drain)\n7\t//! - Group removal\n8\t//! - Unplanned node failure handling\n9\t//!\n10\t//! The rebalancer coordinates shard migrations using the migration coordinator\n11\t//! and provides admin API endpoints for topology operations.\n12\t\n13\tuse crate::migration::{MigrationCoordinator, MigrationId, MigrationConfig, MigrationError, NodeId as MigrationNodeId, ShardId};\n14\tuse crate::task_store::TaskStore;\n15\tuse crate::topology::{Node, NodeId as TopologyNodeId, NodeStatus, Topology};\n16\tuse crate::router::{assign_shard_in_group, score};\n17\tuse serde::{Deserialize, Serialize};\n18\tuse std::collections::HashMap;\n19\tuse std::sync::Arc;\n20\tuse std::time::{Duration, Instant};\n21\tuse tokio::sync::RwLock;\n22\tuse tracing::{debug, error, info, instrument, warn};\n23\t\n24\t/// Callback type for recording rebalancer metrics.\n25\tpub type RebalancerMetricsCallback = Arc;\n26\t\n27\t/// Convert a topology NodeId to a migration NodeId.\n28\tfn topo_to_migration_node_id(id: &TopologyNodeId) -> MigrationNodeId {\n29\t MigrationNodeId(id.as_str().to_string())\n30\t}\n31\t\n32\t/// Convert a migration NodeId to a topology NodeId.\n33\tfn migration_to_topo_node_id(id: &MigrationNodeId) -> TopologyNodeId {\n34\t TopologyNodeId::new(id.0.clone())\n35\t}\n36\t\n37\t/// Configuration for the rebalancer.\n38\t#[derive(Debug, Clone, Serialize, Deserialize)]\n39\tpub struct RebalancerConfig {\n40\t /// Maximum concurrent shard migrations.\n41\t pub max_concurrent_migrations: u32,\n42\t /// Timeout for a single migration operation.\n43\t pub migration_timeout_s: u64,\n44\t /// Whether to automatically rebalance on node recovery.\n45\t pub auto_rebalance_on_recovery: bool,\n46\t /// Batch size for document migration.\n47\t pub migration_batch_size: u32,\n48\t /// Delay between migration batches (ms).\n49\t pub migration_batch_delay_ms: u64,\n50\t}\n51\t\n52\timpl Default for RebalancerConfig {\n53\t fn default() -> Self {\n54\t Self {\n55\t max_concurrent_migrations: 4,\n56\t migration_timeout_s: 3600,\n57\t auto_rebalance_on_recovery: true,\n58\t migration_batch_size: 1000,\n59\t migration_batch_delay_ms: 100,\n60\t }\n61\t }\n62\t}\n63\t\n64\t/// Type of topology operation.\n65\t#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]\n66\t#[serde(rename_all = \"snake_case\")]\n67\tpub enum TopologyOperationType {\n68\t /// Adding a new node to an existing replica group.\n69\t AddNode,\n70\t /// Removing a node from a replica group.\n71\t RemoveNode,\n72\t /// Draining a node before removal.\n73\t DrainNode,\n74\t /// Adding a new replica group.\n75\t AddReplicaGroup,\n76\t /// Removing an entire replica group.\n77\t RemoveReplicaGroup,\n78\t /// Handling a failed node.\n79\t NodeFailure,\n80\t}\n81\t\n82\t/// Status of a topology operation.\n83\t#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]\n84\t#[serde(rename_all = \"snake_case\")]\n85\tpub enum TopologyOperationStatus {\n86\t /// Operation is pending.\n87\t Pending,\n88\t /// Operation is in progress.\n89\t InProgress,\n90\t /// Operation completed successfully.\n91\t Complete,\n92\t /// Operation failed.\n93\t Failed,\n94\t /// Operation was cancelled.\n95\t Cancelled,\n96\t}\n97\t\n98\t/// A topology operation (node/group add/remove/drain).\n99\t#[derive(Debug, Clone, Serialize, Deserialize)]\n100\tpub struct TopologyOperation {\n101\t /// Unique operation ID.\n102\t pub id: u64,\n103\t /// Type of operation.\n104\t pub op_type: TopologyOperationType,\n105\t /// Current status.\n106\t pub status: TopologyOperationStatus,\n107\t /// Target node ID (for node operations).\n108\t pub target_node: Option,\n109\t /// Target replica group ID (for group operations).\n110\t pub target_group: Option,\n111\t /// Shard migrations in progress for this operation.\n112\t pub migrations: Vec,\n113\t /// Start time.\n114\t pub started_at: Option,\n115\t /// Completion time.\n116\t pub completed_at: Option,\n117\t /// Error message if failed.\n118\t pub error: Option,\n119\t}\n120\t\n121\t/// Result of a topology operation request.\n122\t#[derive(Debug, Clone, Serialize, Deserialize)]\n123\tpub struct TopologyOperationResult {\n124\t /// Operation ID.\n125\t pub id: u64,\n126\t /// Status message.\n127\t pub message: String,\n128\t /// Number of shard migrations initiated.\n129\t pub migrations_count: usize,\n130\t}\n131\t\n132\t/// Status of all ongoing topology operations.\n133\t#[derive(Debug, Clone, Serialize, Deserialize)]\n134\tpub struct RebalanceStatus {\n135\t /// Whether a rebalance is currently in progress.\n136\t pub in_progress: bool,\n137\t /// Active topology operations.\n138\t pub operations: Vec,\n139\t /// Active migration details.\n140\t pub migrations: HashMap,\n141\t}\n142\t\n143\t/// Status of a single migration.\n144\t#[derive(Debug, Clone, Serialize, Deserialize)]\n145\tpub struct MigrationStatus {\n146\t /// Migration ID.\n147\t pub id: u64,\n148\t /// New node ID.\n149\t pub new_node: String,\n150\t /// Replica group.\n151\t pub replica_group: u32,\n152\t /// Current phase.\n153\t pub phase: String,\n154\t /// Affected shards count.\n155\t pub shards_count: usize,\n156\t /// Completed shards count.\n157\t pub completed_count: usize,\n158\t}\n159\t\n160\t/// Request to add a node to a replica group.\n161\t#[derive(Debug, Clone, Deserialize)]\n162\tpub struct AddNodeRequest {\n163\t /// Node ID.\n164\t pub id: String,\n165\t /// Node address.\n166\t pub address: String,\n167\t /// Replica group to join.\n168\t pub replica_group: u32,\n169\t}\n170\t\n171\t/// Request to remove a node from the cluster.\n172\t#[derive(Debug, Clone, Deserialize)]\n173\tpub struct RemoveNodeRequest {\n174\t /// Node ID to remove.\n175\t pub node_id: String,\n176\t /// Force removal without draining (dangerous).\n177\t pub force: bool,\n178\t}\n179\t\n180\t/// Request to drain a node (prepare for removal).\n181\t#[derive(Debug, Clone, Deserialize)]\n182\tpub struct DrainNodeRequest {\n183\t /// Node ID to drain.\n184\t pub node_id: String,\n185\t}\n186\t\n187\t/// Request to add a replica group.\n188\t#[derive(Debug, Clone, Deserialize)]\n189\tpub struct AddReplicaGroupRequest {\n190\t /// Group ID.\n191\t pub group_id: u32,\n192\t /// Initial nodes in the group.\n193\t pub nodes: Vec,\n194\t}\n195\t\n196\t/// Node specification for group addition.\n197\t#[derive(Debug, Clone, Deserialize)]\n198\tpub struct GroupNodeSpec {\n199\t /// Node ID.\n200\t pub id: String,\n201\t /// Node address.\n202\t pub address: String,\n203\t}\n204\t\n205\t/// Request to remove a replica group.\n206\t#[derive(Debug, Clone, Deserialize)]\n207\tpub struct RemoveReplicaGroupRequest {\n208\t /// Group ID to remove.\n209\t pub group_id: u32,\n210\t /// Force removal without draining.\n211\t pub force: bool,\n212\t}\n213\t\n214\t/// Rebalancer error types.\n215\t#[derive(Debug, thiserror::Error)]\n216\tpub enum RebalancerError {\n217\t #[error(\"node not found: {0}\")]\n218\t NodeNotFound(String),\n219\t\n220\t #[error(\"replica group not found: {0}\")]\n221\t GroupNotFound(u32),\n222\t\n223\t #[error(\"operation already in progress for node: {0}\")]\n224\t OperationInProgress(String),\n225\t\n226\t #[error(\"invalid topology state: {0}\")]\n227\t InvalidState(String),\n228\t\n229\t #[error(\"migration error: {0}\")]\n230\t MigrationError(#[from] MigrationError),\n231\t\n232\t #[error(\"timeout: {0}\")]\n233\t Timeout(String),\n234\t\n235\t #[error(\"cannot remove last node in group\")]\n236\t CannotRemoveLastNode,\n237\t\n238\t #[error(\"replica group {0} is not empty\")]\n239\t GroupNotEmpty(u32),\n240\t}\n241\t\n242\t/// Migration executor: performs the actual document migration between nodes.\n243\t///\n244\t/// This trait allows the rebalancer core to remain agnostic to the HTTP client\n245\t/// implementation while still performing actual migrations.\n246\t#[async_trait::async_trait]\n247\tpub trait MigrationExecutor: Send + Sync {\n248\t /// Fetch documents from a source node for a specific shard.\n249\t async fn fetch_documents(\n250\t &self,\n251\t source_node: &str,\n252\t source_address: &str,\n253\t index_uid: &str,\n254\t shard_id: u32,\n255\t limit: u32,\n256\t offset: u32,\n257\t ) -> std::result::Result<(Vec, u64), String>;\n258\t\n259\t /// Write documents to a target node.\n260\t async fn write_documents(\n261\t &self,\n262\t target_node: &str,\n263\t target_address: &str,\n264\t index_uid: &str,\n265\t documents: Vec,\n266\t ) -> std::result::Result<(), String>;\n267\t\n268\t /// Delete documents from a node by shard filter.\n269\t async fn delete_shard(\n270\t &self,\n271\t node: &str,\n272\t node_address: &str,\n273\t index_uid: &str,\n274\t shard_id: u32,\n275\t ) -> std::result::Result<(), String>;\n276\t}\n277\t\n278\t/// Rebalancer metrics for Prometheus emission.\n279\t#[derive(Debug, Clone, Default)]\n280\tpub struct RebalancerMetrics {\n281\t /// Total number of documents migrated.\n282\t pub documents_migrated_total: u64,\n283\t /// Number of currently active migrations.\n284\t pub active_migrations: u64,\n285\t /// Start time of the current rebalance operation.\n286\t pub rebalance_start_time: Option,\n287\t}\n288\t\n289\timpl RebalancerMetrics {\n290\t /// Record that documents were migrated.\n291\t pub fn record_documents_migrated(&mut self, count: u64) {\n292\t self.documents_migrated_total += count;\n293\t }\n294\t\n295\t /// Increment active migrations count.\n296\t pub fn increment_active_migrations(&mut self) {\n297\t self.active_migrations += 1;\n298\t }\n299\t\n300\t /// Decrement active migrations count.\n301\t pub fn decrement_active_migrations(&mut self) {\n302\t self.active_migrations = self.active_migrations.saturating_sub(1);\n303\t }\n304\t\n305\t /// Start a rebalance operation.\n306\t pub fn start_rebalance(&mut self) {\n307\t self.rebalance_start_time = Some(Instant::now());\n308\t }\n309\t\n310\t /// End a rebalance operation and return duration in seconds.\n311\t pub fn end_rebalance(&mut self) -> f64 {\n312\t self.rebalance_start_time\n313\t .take()\n314\t .map(|t| t.elapsed().as_secs_f64())\n315\t .unwrap_or(0.0)\n316\t }\n317\t\n318\t /// Get the current rebalance duration in seconds.\n319\t pub fn current_duration_secs(&self) -> f64 {\n320\t self.rebalance_start_time\n321\t .map(|t| t.elapsed().as_secs_f64())\n322\t .unwrap_or(0.0)\n323\t }\n324\t}\n325\t\n326\t/// The cluster rebalancer orchestrates topology changes.\n327\tpub struct Rebalancer {\n328\t config: RebalancerConfig,\n329\t topology: Arc>,\n330\t migration_coordinator: Arc>,\n331\t operations: Arc>>,\n332\t next_op_id: Arc,\n333\t active_migrations: Arc>>, // migration -> operation ID\n334\t migration_executor: Option>,\n335\t /// Metrics for rebalancer operations.\n336\t pub metrics: Arc>,\n337\t /// Task store for leader lease (P4.1 background worker).\n338\t task_store: Option>,\n339\t /// This pod's ID for leader election.\n340\t pod_id: Option,\n341\t /// Leader lease scope prefix.\n342\t leader_scope: String,\n343\t /// Callback for recording Prometheus metrics.\n344\t metrics_callback: Option,\n345\t}\n346\t\n347\timpl Rebalancer {\n348\t /// Create a new rebalancer.\n349\t pub fn new(\n350\t config: RebalancerConfig,\n351\t topology: Arc>,\n352\t migration_config: MigrationConfig,\n353\t ) -> Self {\n354\t let coordinator = Arc::new(RwLock::new(MigrationCoordinator::new(migration_config)));\n355\t\n356\t Self {\n357\t config,\n358\t topology,\n359\t migration_coordinator: coordinator,\n360\t operations: Arc::new(RwLock::new(HashMap::new())),\n361\t next_op_id: Arc::new(std::sync::atomic::AtomicU64::new(1)),\n362\t active_migrations: Arc::new(RwLock::new(HashMap::new())),\n363\t migration_executor: None,\n364\t metrics: Arc::new(RwLock::new(RebalancerMetrics::default())),\n365\t task_store: None,\n366\t pod_id: None,\n367\t leader_scope: \"rebalance:global\".to_string(),\n368\t metrics_callback: None,\n369\t }\n370\t }\n371\t\n372\t /// Set the task store for leader lease (P4.1 background worker).\n373\t pub fn with_task_store(mut self, task_store: Arc) -> Self {\n374\t self.task_store = Some(task_store);\n375\t self\n376\t }\n377\t\n378\t /// Set the pod ID for leader election.\n379\t pub fn with_pod_id(mut self, pod_id: String) -> Self {\n380\t self.pod_id = Some(pod_id);\n381\t self\n382\t }\n383\t\n384\t /// Set the leader lease scope.\n385\t pub fn with_leader_scope(mut self, scope: String) -> Self {\n386\t self.leader_scope = scope;\n387\t self\n388\t }\n389\t\n390\t /// Set the metrics callback for Prometheus emission.\n391\t pub fn with_metrics_callback(mut self, callback: RebalancerMetricsCallback) -> Self {\n392\t self.metrics_callback = Some(callback);\n393\t self\n394\t }\n395\t\n396\t /// Set the migration executor (provides HTTP client for actual migrations).\n397\t pub fn with_migration_executor(mut self, executor: Arc) -> Self {\n398\t self.migration_executor = Some(executor);\n399\t self\n400\t }\n401\t\n402\t /// Emit a metric via the metrics callback (if configured).\n403\t fn emit_metric(&self, name: &str, value: f64) {\n404\t if let Some(ref callback) = self.metrics_callback {\n405\t callback(name, value);\n406\t }\n407\t }\n408\t\n409\t /// Run the background rebalancer worker (P4.1).\n410\t ///\n411\t /// This method runs in a loop, periodically checking for topology changes\n412\t /// and triggering rebalancing as needed. Uses leader lease to ensure only\n413\t /// one pod runs the rebalancer at a time.\n414\t #[instrument(skip_all, fields(pod_id = ?self.pod_id))]\n415\t pub async fn run_background(&self) -> Result<(), RebalancerError> {\n416\t let Some(ref task_store) = self.task_store else {\n417\t return Err(RebalancerError::InvalidState(\n418\t \"task_store required for background worker\".into(),\n419\t ));\n420\t };\n421\t\n422\t let Some(ref pod_id) = self.pod_id else {\n423\t return Err(RebalancerError::InvalidState(\n424\t \"pod_id required for background worker\".into(),\n425\t ));\n426\t };\n427\t\n428\t let check_interval = Duration::from_millis(5000); // Check every 5 seconds\n429\t let mut interval = tokio::time::interval(check_interval);\n430\t let mut leader_lease_interval = tokio::time::interval(Duration::from_secs(3));\n431\t\n432\t info!(\n433\t config = ?self.config,\n434\t \"rebalancer background worker started\"\n435\t );\n436\t\n437\t loop {\n438\t tokio::select! {\n439\t _ = interval.tick() => {\n440\t if self.is_leader(task_store, pod_id).await {\n441\t if let Err(e) = self.check_and_rebalance().await {\n442\t error!(error = %e, \"background rebalance check failed\");\n443\t }\n444\t }\n445\t }\n446\t _ = leader_lease_interval.tick() => {\n447\t if self.is_leader(task_store, pod_id).await {\n448\t self.renew_leader_lease(task_store, pod_id).await;\n449\t }\n450\t }\n451\t }\n452\t }\n453\t }\n454\t\n455\t /// Check if this pod is the leader for rebalancing.\n456\t async fn is_leader(&self, task_store: &Arc, pod_id: &str) -> bool {\n457\t let now = now_ms() as i64;\n458\t let lease_ttl = now + 15000; // 15 second TTL\n459\t\n460\t task_store\n461\t .try_acquire_leader_lease(&self.leader_scope, pod_id, lease_ttl, now)\n462\t .unwrap_or(false)\n463\t }\n464\t\n465\t /// Renew the leader lease.\n466\t async fn renew_leader_lease(&self, task_store: &Arc, pod_id: &str) {\n467\t let now = now_ms() as i64;\n468\t let lease_ttl = now + 15000; // 15 second TTL\n469\t\n470\t let _ = task_store\n471\t .renew_leader_lease(&self.leader_scope, pod_id, lease_ttl);\n472\t }\n473\t\n474\t /// Check for topology changes and trigger rebalancing if needed.\n475\t async fn check_and_rebalance(&self) -> Result<(), RebalancerError> {\n476\t debug!(\"checking for topology changes\");\n477\t\n478\t let topology = self.topology.read().await;\n479\t\n480\t // Check for nodes in Joining state\n481\t let joining_nodes: Vec<_> = topology\n482\t .nodes()\n483\t .filter(|n| n.status == NodeStatus::Joining)\n484\t .map(|n| (n.id.clone(), n.replica_group, n.address.clone()))\n485\t .collect();\n486\t\n487\t // Check for nodes in Draining state\n488\t let draining_nodes: Vec<_> = topology\n489\t .nodes()\n490\t .filter(|n| n.status == NodeStatus::Draining)\n491\t .map(|n| (n.id.clone(), n.replica_group))\n492\t .collect();\n493\t\n494\t // Check for nodes in Failed state\n495\t let failed_nodes: Vec<_> = topology\n496\t .nodes()\n497\t .filter(|n| n.status == NodeStatus::Failed)\n498\t .map(|n| (n.id.clone(), n.replica_group))\n499\t .collect();\n500\t\n501\t // Drop topology read lock before starting operations\n502\t drop(topology);\n503\t\n504\t // Trigger rebalance for joining nodes\n505\t for (node_id, replica_group, address) in joining_nodes {\n506\t info!(node_id = %node_id, replica_group, \"detected joining node\");\n507\t\n508\t // Check if there's already an operation in progress for this node\n509\t let ops = self.operations.read().await;\n510\t let already_in_progress = ops.values().any(|o| {\n511\t o.target_node.as_ref() == Some(&node_id.as_str().to_string())\n512\t && o.status == TopologyOperationStatus::InProgress\n513\t });\n514\t drop(ops);\n515\t\n516\t if !already_in_progress {\n517\t let request = AddNodeRequest {\n518\t id: node_id.as_str().to_string(),\n519\t address,\n520\t replica_group,\n521\t };\n522\t if let Err(e) = self.add_node(request).await {\n523\t warn!(error = %e, \"failed to start rebalance for joining node\");\n524\t }\n525\t }\n526\t }\n527\t\n528\t // Trigger rebalance for draining nodes\n529\t for (node_id, replica_group) in draining_nodes {\n530\t info!(node_id = %node_id, replica_group, \"detected draining node\");\n531\t\n532\t let ops = self.operations.read().await;\n533\t let already_in_progress = ops.values().any(|o| {\n534\t o.target_node.as_ref() == Some(&node_id.as_str().to_string())\n535\t && matches!(\n536\t o.op_type,\n537\t TopologyOperationType::DrainNode | TopologyOperationType::RemoveNode\n538\t )\n539\t && o.status == TopologyOperationStatus::InProgress\n540\t });\n541\t drop(ops);\n542\t\n543\t if !already_in_progress {\n544\t let request = DrainNodeRequest {\n545\t node_id: node_id.as_str().to_string(),\n546\t };\n547\t if let Err(e) = self.drain_node(request).await {\n548\t warn!(error = %e, \"failed to start rebalance for draining node\");\n549\t }\n550\t }\n551\t }\n552\t\n553\t // Handle failed nodes\n554\t for (node_id, replica_group) in failed_nodes {\n555\t info!(node_id = %node_id, replica_group, \"detected failed node\");\n556\t\n557\t let ops = self.operations.read().await;\n558\t let already_handled = ops.values().any(|o| {\n559\t o.target_node.as_ref() == Some(&node_id.as_str().to_string())\n560\t && o.op_type == TopologyOperationType::NodeFailure\n561\t });\n562\t drop(ops);\n563\t\n564\t if !already_handled {\n565\t if let Err(e) = self.handle_node_failure(node_id.as_str()).await {\n566\t warn!(error = %e, \"failed to handle node failure\");\n567\t }\n568\t }\n569\t }\n570\t\n571\t Ok(())\n572\t }\n573\t\n574\t /// Get current rebalance status.\n575\t pub async fn status(&self) -> RebalanceStatus {\n576\t let ops = self.operations.read().await;\n577\t let coordinator = self.migration_coordinator.read().await;\n578\t\n579\t let in_progress = ops.values().any(|o| o.status == TopologyOperationStatus::InProgress);\n580\t\n581\t let mut migrations: HashMap = HashMap::new();\n582\t for op in ops.values() {\n583\t for &mid in &op.migrations {\n584\t if let Some(state) = coordinator.get_state(mid) {\n585\t let key = format!(\"{}\", mid);\n586\t let status = MigrationStatus {\n587\t id: mid.0,\n588\t new_node: state.new_node.to_string(),\n589\t replica_group: state.replica_group,\n590\t phase: state.phase.to_string(),\n591\t shards_count: state.affected_shards.len(),\n592\t completed_count: state\n593\t .affected_shards\n594\t .values()\n595\t .filter(|s| matches!(s, crate::migration::ShardMigrationState::Active))\n596\t .count(),\n597\t };\n598\t migrations.insert(key, status);\n599\t }\n600\t }\n601\t }\n602\t\n603\t RebalanceStatus {\n604\t in_progress,\n605\t operations: ops.values().cloned().collect(),\n606\t migrations,\n607\t }\n608\t }\n609\t\n610\t /// Add a node to a replica group.\n611\t pub async fn add_node(\n612\t &self,\n613\t request: AddNodeRequest,\n614\t ) -> Result {\n615\t info!(\n616\t node_id = %request.id,\n617\t group = request.replica_group,\n618\t \"starting node addition\"\n619\t );\n620\t\n621\t // Check if node already exists\n622\t {\n623\t let topo = self.topology.read().await;\n624\t if topo.node(&TopologyNodeId::new(request.id.clone())).is_some() {\n625\t return Err(RebalancerError::InvalidState(format!(\n626\t \"node {} already exists\",\n627\t request.id\n628\t )));\n629\t }\n630\t }\n631\t\n632\t // Create operation record\n633\t let op_id = self.next_op_id.fetch_add(1, std::sync::atomic::Ordering::SeqCst);\n634\t\n635\t // Add node to topology in Joining state\n636\t {\n637\t let mut topo = self.topology.write().await;\n638\t let group_count = topo.groups().count() as u32;\n639\t if request.replica_group >= group_count {\n640\t return Err(RebalancerError::GroupNotFound(request.replica_group));\n641\t }\n642\t\n643\t let node = Node::new(\n644\t TopologyNodeId::new(request.id.clone()),\n645\t request.address.clone(),\n646\t request.replica_group,\n647\t );\n648\t topo.add_node(node);\n649\t }\n650\t\n651\t // Compute affected shards (shards that will move to new node)\n652\t let affected_shards = self.compute_shard_moves_for_new_node(&request.id, request.replica_group).await?;\n653\t\n654\t // Create migration for each affected shard\n655\t let mut migrations = Vec::new();\n656\t {\n657\t let mut coordinator = self.migration_coordinator.write().await;\n658\t\n659\t for (shard, old_owner) in affected_shards {\n660\t let mut old_owners = HashMap::new();\n661\t old_owners.insert(shard, topo_to_migration_node_id(&old_owner));\n662\t\n663\t let mid = coordinator.begin_migration(\n664\t topo_to_migration_node_id(&TopologyNodeId::new(request.id.clone())),\n665\t request.replica_group,\n666\t old_owners,\n667\t )?;\n668\t\n669\t // Start dual-write\n670\t coordinator.begin_dual_write(mid)?;\n671\t\n672\t // Track migration\n673\t {\n674\t let mut active = self.active_migrations.write().await;\n675\t active.insert(mid, op_id);\n676\t }\n677\t\n678\t migrations.push(mid);\n679\t }\n680\t }\n681\t\n682\t // Record operation\n683\t let node_id_for_result = request.id.clone();\n684\t let migrations_count = migrations.len();\n685\t let operation = TopologyOperation {\n686\t id: op_id,\n687\t op_type: TopologyOperationType::AddNode,\n688\t status: TopologyOperationStatus::InProgress,\n689\t target_node: Some(request.id),\n690\t target_group: Some(request.replica_group),\n691\t migrations: migrations.clone(),\n692\t started_at: Some(now_ms()),\n693\t completed_at: None,\n694\t error: None,\n695\t };\n696\t\n697\t {\n698\t let mut ops = self.operations.write().await;\n699\t ops.insert(op_id, operation);\n700\t }\n701\t\n702\t // Start metrics tracking\n703\t {\n704\t let mut metrics = self.metrics.write().await;\n705\t metrics.start_rebalance();\n706\t }\n707\t\n708\t // Start background migration task\n709\t let topo_arc = self.topology.clone();\n710\t let coord_arc = self.migration_coordinator.clone();\n711\t let ops_arc = self.operations.clone();\n712\t let active_arc = self.active_migrations.clone();\n713\t let config = self.config.clone();\n714\t let executor = self.migration_executor.clone();\n715\t let metrics_arc = self.metrics.clone();\n716\t\n717\t tokio::spawn(async move {\n718\t if let Err(e) = run_migration_task(\n719\t topo_arc,\n720\t coord_arc,\n721\t ops_arc,\n722\t active_arc,\n723\t op_id,\n724\t migrations,\n725\t config,\n726\t executor,\n727\t metrics_arc,\n728\t )\n729\t .await\n730\t {\n731\t error!(error = %e, op_id = op_id, \"migration task failed\");\n732\t }\n733\t });\n734\t\n735\t Ok(TopologyOperationResult {\n736\t id: op_id,\n737\t message: format!(\n738\t \"Node {} addition started with {} shard migrations\",\n739\t node_id_for_result,\n740\t migrations_count\n741\t ),\n742\t migrations_count,\n743\t })\n744\t }\n745\t\n746\t /// Drain a node (prepare for removal).\n747\t pub async fn drain_node(\n748\t &self,\n749\t request: DrainNodeRequest,\n750\t ) -> Result {\n751\t info!(node_id = %request.node_id, \"starting node drain\");\n752\t\n753\t // Check if node exists\n754\t let node_id = TopologyNodeId::new(request.node_id.clone());\n755\t let (node_status, replica_group) = {\n756\t let topo = self.topology.read().await;\n757\t let node = topo.node(&node_id).ok_or_else(|| {\n758\t RebalancerError::NodeNotFound(request.node_id.clone())\n759\t })?;\n760\t\n761\t // Check if this is the last node in the group\n762\t let group = topo\n763\t .groups()\n764\t .find(|g| g.id == node.replica_group)\n765\t .ok_or_else(|| RebalancerError::GroupNotFound(node.replica_group))?;\n766\t\n767\t if group.nodes().len() <= 1 {\n768\t return Err(RebalancerError::CannotRemoveLastNode);\n769\t }\n770\t\n771\t (node.status, node.replica_group)\n772\t };\n773\t\n774\t if node_status == NodeStatus::Draining {\n775\t return Err(RebalancerError::OperationInProgress(\n776\t request.node_id.clone(),\n777\t ));\n778\t }\n779\t\n780\t // Create operation record\n781\t let op_id = self.next_op_id.fetch_add(1, std::sync::atomic::Ordering::SeqCst);\n782\t\n783\t // Mark node as draining\n784\t {\n785\t let mut topo = self.topology.write().await;\n786\t if let Some(node) = topo.node_mut(&node_id) {\n787\t node.status = NodeStatus::Draining;\n788\t }\n789\t }\n790\t\n791\t // Compute shard destinations (where each shard goes)\n792\t let shard_destinations = self.compute_shard_destinations_for_drain(&request.node_id, replica_group).await?;\n793\t\n794\t // Create migrations for each shard\n795\t let mut migrations = Vec::new();\n796\t {\n797\t let mut coordinator = self.migration_coordinator.write().await;\n798\t\n799\t for (shard, dest_node) in shard_destinations {\n800\t let mid = coordinator.begin_migration(\n801\t topo_to_migration_node_id(&dest_node),\n802\t replica_group,\n803\t [(shard, topo_to_migration_node_id(&node_id))].into_iter().collect(),\n804\t )?;\n805\t\n806\t coordinator.begin_dual_write(mid)?;\n807\t\n808\t {\n809\t let mut active = self.active_migrations.write().await;\n810\t active.insert(mid, op_id);\n811\t }\n812\t\n813\t migrations.push(mid);\n814\t }\n815\t }\n816\t\n817\t // Record operation\n818\t let operation = TopologyOperation {\n819\t id: op_id,\n820\t op_type: TopologyOperationType::DrainNode,\n821\t status: TopologyOperationStatus::InProgress,\n822\t target_node: Some(request.node_id.clone()),\n823\t target_group: Some(replica_group),\n824\t migrations: migrations.clone(),\n825\t started_at: Some(now_ms()),\n826\t completed_at: None,\n827\t error: None,\n828\t };\n829\t\n830\t {\n831\t let mut ops = self.operations.write().await;\n832\t ops.insert(op_id, operation);\n833\t }\n834\t\n835\t // Start metrics tracking\n836\t {\n837\t let mut metrics = self.metrics.write().await;\n838\t metrics.start_rebalance();\n839\t }\n840\t\n841\t // Start background migration task\n842\t let migrations_count = migrations.len();\n843\t let topo_arc = self.topology.clone();\n844\t let coord_arc = self.migration_coordinator.clone();\n845\t let ops_arc = self.operations.clone();\n846\t let active_arc = self.active_migrations.clone();\n847\t let config = self.config.clone();\n848\t let drain_node_id = request.node_id.clone();\n849\t let executor = self.migration_executor.clone();\n850\t let metrics_arc = self.metrics.clone();\n851\t\n852\t tokio::spawn(async move {\n853\t if let Err(e) = run_drain_task(\n854\t topo_arc,\n855\t coord_arc,\n856\t ops_arc,\n857\t active_arc,\n858\t op_id,\n859\t migrations,\n860\t config,\n861\t drain_node_id,\n862\t executor,\n863\t metrics_arc,\n864\t )\n865\t .await\n866\t {\n867\t error!(error = %e, op_id = op_id, \"drain task failed\");\n868\t }\n869\t });\n870\t\n871\t Ok(TopologyOperationResult {\n872\t id: op_id,\n873\t message: format!(\n874\t \"Node {} drain started with {} shard migrations\",\n875\t request.node_id,\n876\t migrations_count\n877\t ),\n878\t migrations_count,\n879\t })\n880\t }\n881\t\n882\t /// Remove a node from the cluster (after drain).\n883\t pub async fn remove_node(\n884\t &self,\n885\t request: RemoveNodeRequest,\n886\t ) -> Result {\n887\t info!(node_id = %request.node_id, force = request.force, \"starting node removal\");\n888\t\n889\t let node_id = TopologyNodeId::new(request.node_id.clone());\n890\t\n891\t // Check node state\n892\t let node_status = {\n893\t let topo = self.topology.read().await;\n894\t let node = topo.node(&node_id).ok_or_else(|| {\n895\t RebalancerError::NodeNotFound(request.node_id.clone())\n896\t })?;\n897\t\n898\t // Check if this is the last node in the group\n899\t let group = topo\n900\t .groups()\n901\t .find(|g| g.id == node.replica_group)\n902\t .ok_or_else(|| RebalancerError::GroupNotFound(node.replica_group))?;\n903\t\n904\t if group.nodes().len() <= 1 {\n905\t return Err(RebalancerError::CannotRemoveLastNode);\n906\t }\n907\t\n908\t node.status\n909\t };\n910\t\n911\t if !request.force && node_status != NodeStatus::Draining {\n912\t return Err(RebalancerError::InvalidState(format!(\n913\t \"node {} is not in draining state (current: {:?}), use force=true to bypass\",\n914\t request.node_id, node_status\n915\t )));\n916\t }\n917\t\n918\t // Create operation record\n919\t let op_id = self.next_op_id.fetch_add(1, std::sync::atomic::Ordering::SeqCst);\n920\t\n921\t // Remove node from topology\n922\t {\n923\t let mut topo = self.topology.write().await;\n924\t topo.remove_node(&node_id);\n925\t }\n926\t\n927\t // Record operation\n928\t let operation = TopologyOperation {\n929\t id: op_id,\n930\t op_type: TopologyOperationType::RemoveNode,\n931\t status: TopologyOperationStatus::Complete,\n932\t target_node: Some(request.node_id.clone()),\n933\t target_group: None,\n934\t migrations: Vec::new(),\n935\t started_at: Some(now_ms()),\n936\t completed_at: Some(now_ms()),\n937\t error: None,\n938\t };\n939\t\n940\t {\n941\t let mut ops = self.operations.write().await;\n942\t ops.insert(op_id, operation);\n943\t }\n944\t\n945\t Ok(TopologyOperationResult {\n946\t id: op_id,\n947\t message: format!(\"Node {} removed from cluster\", request.node_id),\n948\t migrations_count: 0,\n949\t })\n950\t }\n951\t\n952\t /// Add a replica group.\n953\t pub async fn add_replica_group(\n954\t &self,\n955\t request: AddReplicaGroupRequest,\n956\t ) -> Result {\n957\t info!(group_id = request.group_id, node_count = request.nodes.len(), \"starting replica group addition\");\n958\t\n959\t // Check if group already exists\n960\t {\n961\t let topo = self.topology.read().await;\n962\t if topo.groups().any(|g| g.id == request.group_id) {\n963\t return Err(RebalancerError::InvalidState(format!(\n964\t \"replica group {} already exists\",\n965\t request.group_id\n966\t )));\n967\t }\n968\t }\n969\t\n970\t // Create operation record\n971\t let op_id = self.next_op_id.fetch_add(1, std::sync::atomic::Ordering::SeqCst);\n972\t\n973\t // Add nodes to topology\n974\t let node_ids: Vec = request.nodes.iter().map(|n| n.id.clone()).collect();\n975\t for node_spec in &request.nodes {\n976\t let mut topo = self.topology.write().await;\n977\t let node = Node::new(\n978\t TopologyNodeId::new(node_spec.id.clone()),\n979\t node_spec.address.clone(),\n980\t request.group_id,\n981\t );\n982\t topo.add_node(node);\n983\t }\n984\t\n985\t // For replica groups, we don't migrate data - the new group will sync from existing groups\n986\t // This is handled by the replication mechanism\n987\t\n988\t // Record operation\n989\t let operation = TopologyOperation {\n990\t id: op_id,\n991\t op_type: TopologyOperationType::AddReplicaGroup,\n992\t status: TopologyOperationStatus::Complete,\n993\t target_node: None,\n994\t target_group: Some(request.group_id),\n995\t migrations: Vec::new(),\n996\t started_at: Some(now_ms()),\n997\t completed_at: Some(now_ms()),\n998\t error: None,\n999\t };\n1000\t\n1001\t {\n1002\t let mut ops = self.operations.write().await;\n1003\t ops.insert(op_id, operation);\n1004\t }\n1005\t\n1006\t Ok(TopologyOperationResult {\n1007\t id: op_id,\n1008\t message: format!(\n1009\t \"Replica group {} added with {} nodes\",\n1010\t request.group_id,\n1011\t node_ids.len()\n1012\t ),\n1013\t migrations_count: 0,\n1014\t })\n1015\t }\n1016\t\n1017\t /// Remove a replica group.\n1018\t pub async fn remove_replica_group(\n1019\t &self,\n1020\t request: RemoveReplicaGroupRequest,\n1021\t ) -> Result {\n1022\t info!(group_id = request.group_id, force = request.force, \"starting replica group removal\");\n1023\t\n1024\t // Check if group exists and is empty\n1025\t {\n1026\t let topo = self.topology.read().await;\n1027\t let group = topo.groups().find(|g| g.id == request.group_id);\n1028\t\n1029\t let Some(grp) = group else {\n1030\t return Err(RebalancerError::GroupNotFound(request.group_id));\n1031\t };\n1032\t\n1033\t if !request.force && !grp.nodes().is_empty() {\n1034\t return Err(RebalancerError::GroupNotEmpty(request.group_id));\n1035\t }\n1036\t\n1037\t // Check if this is the last group\n1038\t if topo.groups().count() <= 1 {\n1039\t return Err(RebalancerError::InvalidState(\n1040\t \"cannot remove the last replica group\".into(),\n1041\t ));\n1042\t }\n1043\t }\n1044\t\n1045\t // Create operation record\n1046\t let op_id = self.next_op_id.fetch_add(1, std::sync::atomic::Ordering::SeqCst);\n1047\t\n1048\t // Remove group from topology (this removes all nodes in the group)\n1049\t {\n1050\t let mut topo = self.topology.write().await;\n1051\t topo.remove_group(request.group_id);\n1052\t }\n1053\t\n1054\t // Record operation\n1055\t let operation = TopologyOperation {\n1056\t id: op_id,\n1057\t op_type: TopologyOperationType::RemoveReplicaGroup,\n1058\t status: TopologyOperationStatus::Complete,\n1059\t target_node: None,\n1060\t target_group: Some(request.group_id),\n1061\t migrations: Vec::new(),\n1062\t started_at: Some(now_ms()),\n1063\t completed_at: Some(now_ms()),\n1064\t error: None,\n1065\t };\n1066\t\n1067\t {\n1068\t let mut ops = self.operations.write().await;\n1069\t ops.insert(op_id, operation);\n1070\t }\n1071\t\n1072\t Ok(TopologyOperationResult {\n1073\t id: op_id,\n1074\t message: format!(\"Replica group {} removed from cluster\", request.group_id),\n1075\t migrations_count: 0,\n1076\t })\n1077\t }\n1078\t\n1079\t /// Handle a node failure.\n1080\t pub async fn handle_node_failure(\n1081\t &self,\n1082\t node_id: &str,\n1083\t ) -> Result {\n1084\t warn!(node_id = %node_id, \"handling node failure\");\n1085\t\n1086\t let node_id_obj = TopologyNodeId::new(node_id.to_string());\n1087\t\n1088\t // Mark node as failed\n1089\t let replica_group = {\n1090\t let mut topo = self.topology.write().await;\n1091\t let node = topo.node_mut(&node_id_obj).ok_or_else(|| {\n1092\t RebalancerError::NodeNotFound(node_id.to_string())\n1093\t })?;\n1094\t\n1095\t node.status = NodeStatus::Failed;\n1096\t node.replica_group\n1097\t };\n1098\t\n1099\t // Create operation record\n1100\t let op_id = self.next_op_id.fetch_add(1, std::sync::atomic::Ordering::SeqCst);\n1101\t\n1102\t // TODO: Schedule background replication to restore RF if needed\n1103\t // For now, just record the failure\n1104\t\n1105\t let operation = TopologyOperation {\n1106\t id: op_id,\n1107\t op_type: TopologyOperationType::NodeFailure,\n1108\t status: TopologyOperationStatus::Complete,\n1109\t target_node: Some(node_id.to_string()),\n1110\t target_group: Some(replica_group),\n1111\t migrations: Vec::new(),\n1112\t started_at: Some(now_ms()),\n1113\t completed_at: Some(now_ms()),\n1114\t error: None,\n1115\t };\n1116\t\n1117\t {\n1118\t let mut ops = self.operations.write().await;\n1119\t ops.insert(op_id, operation);\n1120\t }\n1121\t\n1122\t Ok(TopologyOperationResult {\n1123\t id: op_id,\n1124\t message: format!(\"Node {} marked as failed\", node_id),\n1125\t migrations_count: 0,\n1126\t })\n1127\t }\n1128\t\n1129\t /// Compute which shards should move to a new node.\n1130\t /// Returns shard -> old_owner mapping for shards that will move.\n1131\t ///\n1132\t /// For each shard where the new node enters the assignment, we select one\n1133\t /// of the old owners as the migration source. If the new node displaced\n1134\t /// an old owner, we use that node; otherwise we use the lowest-scored old owner.\n1135\t async fn compute_shard_moves_for_new_node(\n1136\t &self,\n1137\t new_node_id: &str,\n1138\t replica_group: u32,\n1139\t ) -> Result, RebalancerError> {\n1140\t let topo = self.topology.read().await;\n1141\t\n1142\t let new_node_id = TopologyNodeId::new(new_node_id.to_string());\n1143\t let rf = topo.rf();\n1144\t\n1145\t // Find the target group\n1146\t let group = topo\n1147\t .groups()\n1148\t .find(|g| g.id == replica_group)\n1149\t .ok_or_else(|| RebalancerError::GroupNotFound(replica_group))?;\n1150\t\n1151\t let existing_nodes: Vec<_> = group.nodes().iter().cloned().collect();\n1152\t let mut affected_shards = Vec::new();\n1153\t\n1154\t // For each shard, check if the new node is in the new assignment\n1155\t for shard_id in 0..topo.shards {\n1156\t let old_assignment: Vec<_> = assign_shard_in_group(shard_id, &existing_nodes, rf)\n1157\t .into_iter()\n1158\t .collect();\n1159\t\n1160\t // New assignment with the new node included\n1161\t let all_nodes: Vec<_> = existing_nodes\n1162\t .iter()\n1163\t .cloned()\n1164\t .chain(std::iter::once(new_node_id.clone()))\n1165\t .collect();\n1166\t let new_assignment: Vec<_> = assign_shard_in_group(shard_id, &all_nodes, rf)\n1167\t .into_iter()\n1168\t .collect();\n1169\t\n1170\t // Check if new node is in the new assignment\n1171\t if !new_assignment.contains(&new_node_id) {\n1172\t continue;\n1173\t }\n1174\t\n1175\t // Find the source node for migration\n1176\t // Priority 1: Use the displaced node (if any)\n1177\t // Priority 2: Use the lowest-scored old owner (load balancing)\n1178\t let source_node = if let Some(displaced) = old_assignment.iter()\n1179\t .find(|n| !new_assignment.contains(n)) {\n1180\t // An old node was displaced - use it as source\n1181\t displaced.clone()\n1182\t } else {\n1183\t // No displacement - pick lowest-scored old owner\n1184\t // Find the old owner with the minimum rendezvous score\n1185\t let mut min_score = u64::MAX;\n1186\t let mut min_node = old_assignment.first().cloned()\n1187\t .unwrap_or_else(|| existing_nodes.first().unwrap().clone());\n1188\t\n1189\t for old_node in &old_assignment {\n1190\t let s = score(shard_id, old_node.as_str());\n1191\t if s < min_score {\n1192\t min_score = s;\n1193\t min_node = old_node.clone();\n1194\t }\n1195\t }\n1196\t min_node\n1197\t };\n1198\t\n1199\t affected_shards.push((ShardId(shard_id), source_node));\n1200\t }\n1201\t\n1202\t Ok(affected_shards)\n1203\t }\n1204\t\n1205\t /// Compute where each shard should go when draining a node.\n1206\t /// Returns shard -> destination_node mapping.\n1207\t async fn compute_shard_destinations_for_drain(\n1208\t &self,\n1209\t drain_node_id: &str,\n1210\t replica_group: u32,\n1211\t ) -> Result, RebalancerError> {\n1212\t let topo = self.topology.read().await;\n1213\t\n1214\t let drain_node_id = TopologyNodeId::new(drain_node_id.to_string());\n1215\t let rf = topo.rf();\n1216\t\n1217\t // Find the target group\n1218\t let group = topo\n1219\t .groups()\n1220\t .find(|g| g.id == replica_group)\n1221\t .ok_or_else(|| RebalancerError::GroupNotFound(replica_group))?;\n1222\t\n1223\t let other_nodes: Vec<_> = group\n1224\t .nodes()\n1225\t .iter()\n1226\t .filter(|n| **n != drain_node_id)\n1227\t .cloned()\n1228\t .collect();\n1229\t\n1230\t if other_nodes.is_empty() {\n1231\t return Err(RebalancerError::CannotRemoveLastNode);\n1232\t }\n1233\t\n1234\t let mut destinations = Vec::new();\n1235\t\n1236\t // For each shard, find a new owner among the remaining nodes\n1237\t for shard_id in 0..topo.shards {\n1238\t // Check if the draining node is in the assignment for this shard\n1239\t let assignment: Vec<_> = assign_shard_in_group(shard_id, group.nodes(), rf);\n1240\t\n1241\t if assignment.contains(&drain_node_id) {\n1242\t // This shard needs a new home\n1243\t // Use rendezvous hash to pick the best remaining node\n1244\t let mut best_node = None;\n1245\t let mut best_score = 0u64;\n1246\t\n1247\t for node in &other_nodes {\n1248\t let s = score(shard_id, node.as_str());\n1249\t if s > best_score {\n1250\t best_score = s;\n1251\t best_node = Some(node.clone());\n1252\t }\n1253\t }\n1254\t\n1255\t if let Some(dest) = best_node {\n1256\t destinations.push((ShardId(shard_id), dest));\n1257\t }\n1258\t }\n1259\t }\n1260\t\n1261\t Ok(destinations)\n1262\t }\n1263\t}\n1264\t\n1265\t/// Background task to run migrations for a topology operation.\n1266\tasync fn run_migration_task(\n1267\t topology: Arc>,\n1268\t coordinator: Arc>,\n1269\t operations: Arc>>,\n1270\t active_migrations: Arc>>,\n1271\t op_id: u64,\n1272\t migrations: Vec,\n1273\t config: RebalancerConfig,\n1274\t executor: Option>,\n1275\t metrics: Arc>,\n1276\t) -> Result<(), RebalancerError> {\n1277\t let Some(exec) = executor else {\n1278\t // No executor - simulate completion for testing\n1279\t for mid in migrations {\n1280\t tokio::time::sleep(tokio::time::Duration::from_millis(\n1281\t config.migration_batch_delay_ms,\n1282\t ))\n1283\t .await;\n1284\t\n1285\t let shards_to_complete = {\n1286\t let coord = coordinator.read().await;\n1287\t if let Some(state) = coord.get_state(mid) {\n1288\t state.old_owners.keys().copied().collect::>()\n1289\t } else {\n1290\t continue;\n1291\t }\n1292\t };\n1293\t\n1294\t let docs_per_shard = 1000u64;\n1295\t {\n1296\t let mut coord = coordinator.write().await;\n1297\t for shard in &shards_to_complete {\n1298\t coord.shard_migration_complete(mid, *shard, docs_per_shard)?;\n1299\t }\n1300\t }\n1301\t\n1302\t // Record metrics for simulated migration\n1303\t {\n1304\t let mut metrics_guard = metrics.write().await;\n1305\t metrics_guard.record_documents_migrated(docs_per_shard * shards_to_complete.len() as u64);\n1306\t }\n1307\t\n1308\t {\n1309\t let mut coord = coordinator.write().await;\n1310\t coord.begin_cutover(mid)?;\n1311\t coord.complete_drain(mid)?;\n1312\t coord.complete_cleanup(mid)?;\n1313\t }\n1314\t\n1315\t {\n1316\t let mut active = active_migrations.write().await;\n1317\t active.remove(&mid);\n1318\t }\n1319\t }\n1320\t\n1321\t // Mark operation as complete\n1322\t {\n1323\t let mut ops = operations.write().await;\n1324\t if let Some(op) = ops.get_mut(&op_id) {\n1325\t op.status = TopologyOperationStatus::Complete;\n1326\t op.completed_at = Some(now_ms());\n1327\t }\n1328\t }\n1329\t\n1330\t // Mark new node as active\n1331\t {\n1332\t let mut topo = topology.write().await;\n1333\t let ops = operations.read().await;\n1334\t if let Some(op) = ops.get(&op_id) {\n1335\t if let Some(ref node_id) = op.target_node {\n1336\t let node_id = TopologyNodeId::new(node_id.clone());\n1337\t if let Some(node) = topo.node_mut(&node_id) {\n1338\t node.status = NodeStatus::Active;\n1339\t }\n1340\t }\n1341\t }\n1342\t }\n1343\t\n1344\t return Ok(());\n1345\t };\n1346\t\n1347\t // With executor - perform actual migration\n1348\t // For each migration (each shard that moves to the new node)\n1349\t for mid in migrations {\n1350\t // Get migration state to find source/target info\n1351\t let (new_node, _replica_group, old_owners, index_uid) = {\n1352\t let coord = coordinator.read().await;\n1353\t let state = coord.get_state(mid).ok_or_else(|| {\n1354\t RebalancerError::InvalidState(\"migration state not found\".into())\n1355\t })?;\n1356\t\n1357\t // Use a default index for now - in production, this would come from config\n1358\t let index_uid = \"default\".to_string();\n1359\t\n1360\t (\n1361\t state.new_node.to_string(),\n1362\t state.replica_group,\n1363\t state.old_owners.clone(),\n1364\t index_uid,\n1365\t )\n1366\t };\n1367\t\n1368\t // Get node addresses\n1369\t let (new_node_address, old_owner_addresses) = {\n1370\t let topo = topology.read().await;\n1371\t let new_addr = topo.node(&TopologyNodeId::new(new_node.to_string()))\n1372\t .ok_or_else(|| RebalancerError::NodeNotFound(new_node.to_string()))?\n1373\t .address.clone();\n1374\t\n1375\t let mut old_addrs = HashMap::new();\n1376\t for (shard, old_node) in &old_owners {\n1377\t if let Some(node) = topo.node(&migration_to_topo_node_id(old_node)) {\n1378\t old_addrs.insert(*shard, node.address.clone());\n1379\t }\n1380\t }\n1381\t\n1382\t (new_addr, old_addrs)\n1383\t };\n1384\t\n1385\t let mut migration_total_docs = 0u64;\n1386\t\n1387\t // For each shard in the migration\n1388\t for (shard_id, old_node_id) in &old_owners {\n1389\t let old_address = old_owner_addresses.get(shard_id)\n1390\t .ok_or_else(|| RebalancerError::InvalidState(\"old node address not found\".into()))?;\n1391\t\n1392\t info!(\n1393\t migration_id = %mid,\n1394\t shard_id = shard_id.0,\n1395\t from = %old_node_id.0,\n1396\t to = %new_node,\n1397\t \"starting shard migration\"\n1398\t );\n1399\t\n1400\t // Paginate through all documents for this shard\n1401\t let mut offset = 0u32;\n1402\t let limit = config.migration_batch_size;\n1403\t let mut total_docs_copied = 0u64;\n1404\t\n1405\t loop {\n1406\t // Fetch documents from source\n1407\t let (docs, _total) = exec.fetch_documents(\n1408\t &old_node_id.0,\n1409\t old_address,\n1410\t &index_uid,\n1411\t shard_id.0,\n1412\t limit,\n1413\t offset,\n1414\t ).await.map_err(|e| {\n1415\t RebalancerError::InvalidState(format!(\"fetch failed: {}\", e))\n1416\t })?;\n1417\t\n1418\t if docs.is_empty() {\n1419\t break; // No more documents\n1420\t }\n1421\t\n1422\t // Write documents to target\n1423\t exec.write_documents(\n1424\t &new_node,\n1425\t &new_node_address,\n1426\t &index_uid,\n1427\t docs.clone(),\n1428\t ).await.map_err(|e| {\n1429\t RebalancerError::InvalidState(format!(\"write failed: {}\", e))\n1430\t })?;\n1431\t\n1432\t total_docs_copied += docs.len() as u64;\n1433\t offset += limit;\n1434\t\n1435\t // Throttle if configured\n1436\t if config.migration_batch_delay_ms > 0 {\n1437\t tokio::time::sleep(tokio::time::Duration::from_millis(\n1438\t config.migration_batch_delay_ms,\n1439\t ))\n1440\t .await;\n1441\t }\n1442\t }\n1443\t\n1444\t // Mark shard migration complete\n1445\t {\n1446\t let mut coord = coordinator.write().await;\n1447\t coord.shard_migration_complete(mid, *shard_id, total_docs_copied)?;\n1448\t }\n1449\t\n1450\t migration_total_docs += total_docs_copied;\n1451\t\n1452\t info!(\n1453\t migration_id = %mid,\n1454\t shard_id = shard_id.0,\n1455\t docs_copied = total_docs_copied,\n1456\t \"shard migration complete\"\n1457\t );\n1458\t }\n1459\t\n1460\t // Record metrics for this migration\n1461\t {\n1462\t let mut metrics_guard = metrics.write().await;\n1463\t metrics_guard.record_documents_migrated(migration_total_docs);\n1464\t }\n1465\t\n1466\t // All shards for this migration complete - begin cutover\n1467\t {\n1468\t let mut coord = coordinator.write().await;\n1469\t coord.begin_cutover(mid)?;\n1470\t }\n1471\t\n1472\t // Delta pass: re-read from source to catch stragglers\n1473\t for (shard_id, old_node_id) in &old_owners {\n1474\t let old_address = old_owner_addresses.get(shard_id).unwrap();\n1475\t\n1476\t let (docs, _) = exec.fetch_documents(\n1477\t &old_node_id.0,\n1478\t old_address,\n1479\t &index_uid,\n1480\t shard_id.0,\n1481\t config.migration_batch_size,\n1482\t 0,\n1483\t ).await.map_err(|e| {\n1484\t RebalancerError::InvalidState(format!(\"delta fetch failed: {}\", e))\n1485\t })?;\n1486\t\n1487\t if !docs.is_empty() {\n1488\t // Write any stragglers to target\n1489\t exec.write_documents(\n1490\t &new_node,\n1491\t &new_node_address,\n1492\t &index_uid,\n1493\t docs,\n1494\t ).await.map_err(|e| {\n1495\t RebalancerError::InvalidState(format!(\"delta write failed: {}\", e))\n1496\t })?;\n1497\t }\n1498\t\n1499\t // Mark delta complete\n1500\t {\n1501\t let mut coord = coordinator.write().await;\n1502\t // Complete drain after delta pass\n1503\t coord.complete_drain(mid)?;\n1504\t }\n1505\t }\n1506\t\n1507\t // Activate shards\n1508\t {\n1509\t let mut coord = coordinator.write().await;\n1510\t coord.complete_cleanup(mid)?;\n1511\t }\n1512\t\n1513\t // Delete migrated shards from old nodes\n1514\t for (shard_id, old_node_id) in &old_owners {\n1515\t let old_address = old_owner_addresses.get(shard_id).unwrap();\n1516\t\n1517\t if let Err(e) = exec.delete_shard(\n1518\t &old_node_id.0,\n1519\t old_address,\n1520\t &index_uid,\n1521\t shard_id.0,\n1522\t ).await {\n1523\t warn!(\n1524\t shard_id = shard_id.0,\n1525\t node = %old_node_id.0,\n1526\t error = %e,\n1527\t \"failed to delete migrated shard from old node (may need manual cleanup)\"\n1528\t );\n1529\t }\n1530\t }\n1531\t\n1532\t // Remove from active migrations\n1533\t {\n1534\t let mut active = active_migrations.write().await;\n1535\t active.remove(&mid);\n1536\t }\n1537\t }\n1538\t\n1539\t // Mark operation as complete\n1540\t {\n1541\t let mut ops = operations.write().await;\n1542\t if let Some(op) = ops.get_mut(&op_id) {\n1543\t op.status = TopologyOperationStatus::Complete;\n1544\t op.completed_at = Some(now_ms());\n1545\t }\n1546\t }\n1547\t\n1548\t // Mark new node as active\n1549\t {\n1550\t let mut topo = topology.write().await;\n1551\t let ops = operations.read().await;\n1552\t if let Some(op) = ops.get(&op_id) {\n1553\t if let Some(ref node_id) = op.target_node {\n1554\t let node_id = TopologyNodeId::new(node_id.clone());\n1555\t if let Some(node) = topo.node_mut(&node_id) {\n1556\t node.status = NodeStatus::Active;\n1557\t }\n1558\t }\n1559\t }\n1560\t }\n1561\t\n1562\t Ok(())\n1563\t}\n1564\t\n1565\t/// Background task to run drain migrations for a node.\n1566\tasync fn run_drain_task(\n1567\t topology: Arc>,\n1568\t coordinator: Arc>,\n1569\t operations: Arc>>,\n1570\t active_migrations: Arc>>,\n1571\t op_id: u64,\n1572\t migrations: Vec,\n1573\t config: RebalancerConfig,\n1574\t drain_node_id: String,\n1575\t executor: Option>,\n1576\t metrics: Arc>,\n1577\t) -> Result<(), RebalancerError> {\n1578\t let Some(exec) = executor else {\n1579\t // No executor - simulate completion for testing\n1580\t for mid in migrations {\n1581\t tokio::time::sleep(tokio::time::Duration::from_millis(\n1582\t config.migration_batch_delay_ms,\n1583\t ))\n1584\t .await;\n1585\t\n1586\t let shards_to_complete = {\n1587\t let coord = coordinator.read().await;\n1588\t if let Some(state) = coord.get_state(mid) {\n1589\t state.old_owners.keys().copied().collect::>()\n1590\t } else {\n1591\t continue;\n1592\t }\n1593\t };\n1594\t\n1595\t let docs_per_shard = 1000u64;\n1596\t {\n1597\t let mut coord = coordinator.write().await;\n1598\t for shard in &shards_to_complete {\n1599\t coord.shard_migration_complete(mid, *shard, docs_per_shard)?;\n1600\t }\n1601\t }\n1602\t\n1603\t // Record metrics for simulated migration\n1604\t {\n1605\t let mut metrics_guard = metrics.write().await;\n1606\t metrics_guard.record_documents_migrated(docs_per_shard * shards_to_complete.len() as u64);\n1607\t }\n1608\t\n1609\t {\n1610\t let mut coord = coordinator.write().await;\n1611\t coord.begin_cutover(mid)?;\n1612\t coord.complete_drain(mid)?;\n1613\t coord.complete_cleanup(mid)?;\n1614\t }\n1615\t\n1616\t {\n1617\t let mut active = active_migrations.write().await;\n1618\t active.remove(&mid);\n1619\t }\n1620\t }\n1621\t\n1622\t // Mark operation as complete\n1623\t {\n1624\t let mut ops = operations.write().await;\n1625\t if let Some(op) = ops.get_mut(&op_id) {\n1626\t op.status = TopologyOperationStatus::Complete;\n1627\t op.completed_at = Some(now_ms());\n1628\t }\n1629\t }\n1630\t\n1631\t // Mark drained node as removed (operator can delete PVC)\n1632\t {\n1633\t let mut topo = topology.write().await;\n1634\t let node_id = TopologyNodeId::new(drain_node_id);\n1635\t if let Some(node) = topo.node_mut(&node_id) {\n1636\t node.status = NodeStatus::Removed;\n1637\t }\n1638\t }\n1639\t\n1640\t return Ok(());\n1641\t };\n1642\t\n1643\t // With executor - perform actual drain migration\n1644\t // For each migration (each shard being drained from the node)\n1645\t for mid in migrations {\n1646\t // Get migration state\n1647\t let (new_node, _replica_group, old_owners, index_uid) = {\n1648\t let coord = coordinator.read().await;\n1649\t let state = coord.get_state(mid).ok_or_else(|| {\n1650\t RebalancerError::InvalidState(\"migration state not found\".into())\n1651\t })?;\n1652\t\n1653\t // Use a default index for now\n1654\t let index_uid = \"default\".to_string();\n1655\t\n1656\t (\n1657\t state.new_node.to_string(),\n1658\t state.replica_group,\n1659\t state.old_owners.clone(),\n1660\t index_uid,\n1661\t )\n1662\t };\n1663\t\n1664\t // Get node addresses\n1665\t let (_drain_node_id_obj, drain_node_address, new_node_address) = {\n1666\t let topo = topology.read().await;\n1667\t let drain_id = TopologyNodeId::new(drain_node_id.clone());\n1668\t let drain_addr = topo.node(&drain_id)\n1669\t .ok_or_else(|| RebalancerError::NodeNotFound(drain_node_id.clone()))?\n1670\t .address.clone();\n1671\t\n1672\t let new_addr = topo.node(&TopologyNodeId::new(new_node.to_string()))\n1673\t .ok_or_else(|| RebalancerError::NodeNotFound(new_node.to_string()))?\n1674\t .address.clone();\n1675\t\n1676\t (drain_id, drain_addr, new_addr)\n1677\t };\n1678\t\n1679\t // For each shard being drained\n1680\t for (shard_id, _old_node) in &old_owners {\n1681\t info!(\n1682\t migration_id = %mid,\n1683\t shard_id = shard_id.0,\n1684\t from = %drain_node_id,\n1685\t to = %new_node,\n1686\t \"starting shard drain\"\n1687\t );\n1688\t\n1689\t // Paginate through all documents for this shard on the draining node\n1690\t let mut offset = 0u32;\n1691\t let limit = config.migration_batch_size;\n1692\t let mut total_docs_copied = 0u64;\n1693\t\n1694\t loop {\n1695\t // Fetch documents from draining node\n1696\t let (docs, _total) = exec.fetch_documents(\n1697\t &drain_node_id,\n1698\t &drain_node_address,\n1699\t &index_uid,\n1700\t shard_id.0,\n1701\t limit,\n1702\t offset,\n1703\t ).await.map_err(|e| {\n1704\t RebalancerError::InvalidState(format!(\"fetch failed: {}\", e))\n1705\t })?;\n1706\t\n1707\t if docs.is_empty() {\n1708\t break; // No more documents\n1709\t }\n1710\t\n1711\t // Write documents to new node\n1712\t exec.write_documents(\n1713\t &new_node,\n1714\t &new_node_address,\n1715\t &index_uid,\n1716\t docs.clone(),\n1717\t ).await.map_err(|e| {\n1718\t RebalancerError::InvalidState(format!(\"write failed: {}\", e))\n1719\t })?;\n1720\t\n1721\t total_docs_copied += docs.len() as u64;\n1722\t offset += limit;\n1723\t\n1724\t if config.migration_batch_delay_ms > 0 {\n1725\t tokio::time::sleep(tokio::time::Duration::from_millis(\n1726\t config.migration_batch_delay_ms,\n1727\t ))\n1728\t .await;\n1729\t }\n1730\t }\n1731\t\n1732\t // Mark shard migration complete\n1733\t {\n1734\t let mut coord = coordinator.write().await;\n1735\t coord.shard_migration_complete(mid, *shard_id, total_docs_copied)?;\n1736\t }\n1737\t\n1738\t info!(\n1739\t migration_id = %mid,\n1740\t shard_id = shard_id.0,\n1741\t docs_copied = total_docs_copied,\n1742\t \"shard drain complete\"\n1743\t );\n1744\t }\n1745\t\n1746\t // All shards for this migration complete - begin cutover\n1747\t {\n1748\t let mut coord = coordinator.write().await;\n1749\t coord.begin_cutover(mid)?;\n1750\t }\n1751\t\n1752\t // Delta pass: re-read from draining node to catch stragglers\n1753\t for (shard_id, _old_node) in &old_owners {\n1754\t let (docs, _) = exec.fetch_documents(\n1755\t &drain_node_id,\n1756\t &drain_node_address,\n1757\t &index_uid,\n1758\t shard_id.0,\n1759\t config.migration_batch_size,\n1760\t 0,\n1761\t ).await.map_err(|e| {\n1762\t RebalancerError::InvalidState(format!(\"delta fetch failed: {}\", e))\n1763\t })?;\n1764\t\n1765\t if !docs.is_empty() {\n1766\t // Write any stragglers to new node\n1767\t exec.write_documents(\n1768\t &new_node,\n1769\t &new_node_address,\n1770\t &index_uid,\n1771\t docs,\n1772\t ).await.map_err(|e| {\n1773\t RebalancerError::InvalidState(format!(\"delta write failed: {}\", e))\n1774\t })?;\n1775\t }\n1776\t\n1777\t {\n1778\t let mut coord = coordinator.write().await;\n1779\t coord.complete_drain(mid)?;\n1780\t }\n1781\t }\n1782\t\n1783\t // Activate shards and complete cleanup\n1784\t {\n1785\t let mut coord = coordinator.write().await;\n1786\t coord.complete_cleanup(mid)?;\n1787\t }\n1788\t\n1789\t // Delete drained shards from the draining node\n1790\t for (shard_id, _old_node) in &old_owners {\n1791\t if let Err(e) = exec.delete_shard(\n1792\t &drain_node_id,\n1793\t &drain_node_address,\n1794\t &index_uid,\n1795\t shard_id.0,\n1796\t ).await {\n1797\t warn!(\n1798\t shard_id = shard_id.0,\n1799\t node = %drain_node_id,\n1800\t error = %e,\n1801\t \"failed to delete drained shard (may need manual cleanup)\"\n1802\t );\n1803\t }\n1804\t }\n1805\t\n1806\t {\n1807\t let mut active = active_migrations.write().await;\n1808\t active.remove(&mid);\n1809\t }\n1810\t }\n1811\t\n1812\t // Mark operation as complete\n1813\t {\n1814\t let mut ops = operations.write().await;\n1815\t if let Some(op) = ops.get_mut(&op_id) {\n1816\t op.status = TopologyOperationStatus::Complete;\n1817\t op.completed_at = Some(now_ms());\n1818\t }\n1819\t }\n1820\t\n1821\t // Mark drained node as removed (operator can delete PVC)\n1822\t {\n1823\t let mut topo = topology.write().await;\n1824\t let node_id = TopologyNodeId::new(drain_node_id);\n1825\t if let Some(node) = topo.node_mut(&node_id) {\n1826\t node.status = NodeStatus::Removed;\n1827\t }\n1828\t }\n1829\t\n1830\t Ok(())\n1831\t}\n1832\t\n1833\t/// Get current time in milliseconds since Unix epoch.\n1834\tfn now_ms() -> u64 {\n1835\t std::time::SystemTime::now()\n1836\t .duration_since(std::time::UNIX_EPOCH)\n1837\t .unwrap_or_default()\n1838\t .as_millis() as u64\n1839\t}\n1840\t\n1841\t// ---------------------------------------------------------------------------\n1842\t// HttpMigrationExecutor - Actual HTTP-based document migration\n1843\t// ---------------------------------------------------------------------------\n1844\t\n1845\t/// HTTP-based migration executor for moving documents between Meilisearch nodes.\n1846\t///\n1847\t/// This implements the `MigrationExecutor` trait by making actual HTTP requests\n1848\t/// to Meilisearch nodes' APIs. It uses the `_miroir_shard` filterable attribute\n1849\t/// to fetch only the documents belonging to a specific shard.\n1850\tpub struct HttpMigrationExecutor {\n1851\t /// Master key for authenticating with Meilisearch nodes.\n1852\t node_master_key: String,\n1853\t /// HTTP client for making requests to nodes.\n1854\t client: reqwest::Client,\n1855\t}\n1856\t\n1857\timpl HttpMigrationExecutor {\n1858\t /// Create a new HTTP migration executor.\n1859\t ///\n1860\t /// # Arguments\n1861\t /// * `node_master_key` - Master key for authenticating with Meilisearch nodes\n1862\t /// * `node_timeout_ms` - Timeout for HTTP requests to nodes (milliseconds)\n1863\t pub fn new(node_master_key: String, node_timeout_ms: u64) -> Self {\n1864\t let timeout = std::time::Duration::from_millis(node_timeout_ms);\n1865\t\n1866\t let client = reqwest::Client::builder()\n1867\t .timeout(timeout)\n1868\t .build()\n1869\t .expect(\"Failed to create HTTP client for migration executor\");\n1870\t\n1871\t Self {\n1872\t node_master_key,\n1873\t client,\n1874\t }\n1875\t }\n1876\t\n1877\t /// Build the filter string for fetching documents by shard.\n1878\t fn shard_filter(&self, shard_id: u32) -> String {\n1879\t format!(\"_miroir_shard = {}\", shard_id)\n1880\t }\n1881\t\n1882\t /// Make an authenticated GET request to a node.\n1883\t async fn get_node(\n1884\t &self,\n1885\t node_address: &str,\n1886\t path: &str,\n1887\t ) -> std::result::Result {\n1888\t let url = if node_address.ends_with('/') {\n1889\t format!(\"{}{}\", node_address, path.trim_start_matches('/'))\n1890\t } else {\n1891\t format!(\"{}/{}\", node_address.trim_end_matches('/'), path.trim_start_matches('/'))\n1892\t };\n1893\t\n1894\t self.client\n1895\t .get(&url)\n1896\t .header(\"Authorization\", format!(\"Bearer {}\", self.node_master_key))\n1897\t .send()\n1898\t .await\n1899\t .map_err(|e| format!(\"GET {} failed: {}\", url, e))\n1900\t }\n1901\t\n1902\t /// Make an authenticated POST request to a node.\n1903\t async fn post_node(\n1904\t &self,\n1905\t node_address: &str,\n1906\t path: &str,\n1907\t body: serde_json::Value,\n1908\t ) -> std::result::Result {\n1909\t let url = if node_address.ends_with('/') {\n1910\t format!(\"{}{}\", node_address, path.trim_start_matches('/'))\n1911\t } else {\n1912\t format!(\"{}/{}\", node_address.trim_end_matches('/'), path.trim_start_matches('/'))\n1913\t };\n1914\t\n1915\t self.client\n1916\t .post(&url)\n1917\t .header(\"Authorization\", format!(\"Bearer {}\", self.node_master_key))\n1918\t .json(&body)\n1919\t .send()\n1920\t .await\n1921\t .map_err(|e| format!(\"POST {} failed: {}\", url, e))\n1922\t }\n1923\t}\n1924\t\n1925\t#[async_trait::async_trait]\n1926\timpl MigrationExecutor for HttpMigrationExecutor {\n1927\t /// Fetch documents from a source node for a specific shard.\n1928\t ///\n1929\t /// Uses the `_miroir_shard` filterable attribute to retrieve only documents\n1930\t /// belonging to the specified shard, avoiding full index scans.\n1931\t async fn fetch_documents(\n1932\t &self,\n1933\t _source_node: &str,\n1934\t source_address: &str,\n1935\t index_uid: &str,\n1936\t shard_id: u32,\n1937\t limit: u32,\n1938\t offset: u32,\n1939\t ) -> std::result::Result<(Vec, u64), String> {\n1940\t let filter = self.shard_filter(shard_id);\n1941\t let path = format!(\n1942\t \"indexes/{}/documents?filter={}&limit={}&offset={}\",\n1943\t index_uid,\n1944\t urlencoding::encode(&filter),\n1945\t limit,\n1946\t offset\n1947\t );\n1948\t\n1949\t let response = self.get_node(source_address, &path).await?;\n1950\t\n1951\t if !response.status().is_success() {\n1952\t let status = response.status();\n1953\t let error_text = response.text().await.unwrap_or_else(|_| \"unable to read error\".to_string());\n1954\t return Err(format!(\n1955\t \"Failed to fetch documents from {}: HTTP {} - {}\",\n1956\t source_address, status, error_text\n1957\t ));\n1958\t }\n1959\t\n1960\t let json_body: serde_json::Value = response\n1961\t .json()\n1962\t .await\n1963\t .map_err(|e| format!(\"Failed to parse response from {}: {}\", source_address, e))?;\n1964\t\n1965\t // Meilisearch returns { results: [...], total: 123, limit: 20, offset: 0 }\n1966\t let results = json_body\n1967\t .get(\"results\")\n1968\t .and_then(|v| v.as_array())\n1969\t .ok_or_else(|| format!(\"Invalid response from {}: missing 'results' field\", source_address))?;\n1970\t\n1971\t let total = json_body\n1972\t .get(\"total\")\n1973\t .and_then(|v| v.as_u64())\n1974\t .unwrap_or(0);\n1975\t\n1976\t Ok((results.clone(), total))\n1977\t }\n1978\t\n1979\t /// Write documents to a target node.\n1980\t ///\n1981\t /// Documents already contain the `_miroir_shard` field from the source,\n1982\t /// so they can be written directly without modification.\n1983\t async fn write_documents(\n1984\t &self,\n1985\t _target_node: &str,\n1986\t target_address: &str,\n1987\t index_uid: &str,\n1988\t documents: Vec,\n1989\t ) -> std::result::Result<(), String> {\n1990\t if documents.is_empty() {\n1991\t return Ok(());\n1992\t }\n1993\t\n1994\t let path = format!(\"indexes/{}/documents\", index_uid);\n1995\t\n1996\t let response = self.post_node(target_address, &path, serde_json::json!(documents)).await?;\n1997\t\n1998\t if !response.status().is_success() {\n1999\t let status = response.status();\n2000\t let error_text = response.text().await.unwrap_or_else(|_| \"unable to read error\".to_string());\n2001\t return Err(format!(\n2002\t \"Failed to write {} documents to {}: HTTP {} - {}\",\n2003\t documents.len(),\n2004\t target_address,\n2005\t status,\n2006\t error_text\n2007\t ));\n2008\t }\n2009\t\n2010\t // The response contains the task UID, but we don't need to wait for it\n2011\t // since migrations are eventually consistent via anti-entropy\n2012\t Ok(())\n2013\t }\n2014\t\n2015\t /// Delete documents from a node by shard filter.\n2016\t ///\n2017\t /// This is called after a shard migration is complete to remove the\n2018\t /// migrated documents from the source node.\n2019\t async fn delete_shard(\n2020\t &self,\n2021\t _node: &str,\n2022\t node_address: &str,\n2023\t index_uid: &str,\n2024\t shard_id: u32,\n2025\t ) -> std::result::Result<(), String> {\n2026\t let filter = self.shard_filter(shard_id);\n2027\t let path = format!(\"indexes/{}/documents/delete\", index_uid);\n2028\t\n2029\t let body = serde_json::json!({\n2030\t \"filter\": filter\n2031\t });\n2032\t\n2033\t let response = self.post_node(node_address, &path, body).await?;\n2034\t\n2035\t if !response.status().is_success() {\n2036\t let status = response.status();\n2037\t let error_text = response.text().await.unwrap_or_else(|_| \"unable to read error\".to_string());\n2038\t return Err(format!(\n2039\t \"Failed to delete shard {} from {}: HTTP {} - {}\",\n2040\t shard_id, node_address, status, error_text\n2041\t ));\n2042\t }\n2043\t\n2044\t Ok(())\n2045\t }\n2046\t}\n2047\t\n2048\t#[cfg(test)]\n2049\tmod tests {\n2050\t use super::*;\n2051\t use crate::migration::MigrationConfig;\n2052\t use crate::topology::Node;\n2053\t use std::sync::Arc;\n2054\t\n2055\t fn test_topology() -> Topology {\n2056\t let mut topo = Topology::new(64, 2, 2);\n2057\t topo.add_node(Node::new(TopologyNodeId::new(\"node-0\".into()), \"http://node-0:7700\".into(), 0));\n2058\t topo.add_node(Node::new(TopologyNodeId::new(\"node-1\".into()), \"http://node-1:7700\".into(), 0));\n2059\t topo.add_node(Node::new(TopologyNodeId::new(\"node-2\".into()), \"http://node-2:7700\".into(), 1));\n2060\t topo.add_node(Node::new(TopologyNodeId::new(\"node-3\".into()), \"http://node-3:7700\".into(), 1));\n2061\t topo\n2062\t }\n2063\t\n2064\t #[test]\n2065\t fn test_rebalancer_config_default() {\n2066\t let config = RebalancerConfig::default();\n2067\t assert_eq!(config.max_concurrent_migrations, 4);\n2068\t assert_eq!(config.migration_timeout_s, 3600);\n2069\t assert!(config.auto_rebalance_on_recovery);\n2070\t }\n2071\t\n2072\t #[test]\n2073\t fn test_topology_operation_serialization() {\n2074\t let op = TopologyOperation {\n2075\t id: 1,\n2076\t op_type: TopologyOperationType::AddNode,\n2077\t status: TopologyOperationStatus::InProgress,\n2078\t target_node: Some(\"node-4\".into()),\n2079\t target_group: Some(0),\n2080\t migrations: vec![MigrationId(1), MigrationId(2)],\n2081\t started_at: Some(1700000000000),\n2082\t completed_at: None,\n2083\t error: None,\n2084\t };\n2085\t\n2086\t let json = serde_json::to_string(&op).unwrap();\n2087\t assert!(json.contains(\"\\\"op_type\\\":\\\"add_node\\\"\"));\n2088\t assert!(json.contains(\"\\\"status\\\":\\\"in_progress\\\"\"));\n2089\t assert!(json.contains(\"\\\"target_node\\\":\\\"node-4\\\"\"));\n2090\t }\n2091\t\n2092\t #[test]\n2093\t fn test_rebalance_status_serialization() {\n2094\t let status = RebalanceStatus {\n2095\t in_progress: true,\n2096\t operations: vec![],\n2097\t migrations: HashMap::new(),\n2098\t };\n2099\t\n2100\t let json = serde_json::to_string(&status).unwrap();\n2101\t assert!(json.contains(\"\\\"in_progress\\\":true\"));\n2102\t }\n2103\t\n2104\t #[tokio::test]\n2105\t async fn test_rebalancer_status() {\n2106\t let topo = Arc::new(RwLock::new(test_topology()));\n2107\t let config = RebalancerConfig::default();\n2108\t let migration_config = MigrationConfig::default();\n2109\t\n2110\t let rebalancer = Rebalancer::new(config, topo, migration_config);\n2111\t\n2112\t let status = rebalancer.status().await;\n2113\t assert!(!status.in_progress);\n2114\t assert!(status.operations.is_empty());\n2115\t }\n2116\t\n2117\t #[tokio::test]\n2118\t async fn test_add_node_creates_operation() {\n2119\t let topo = Arc::new(RwLock::new(test_topology()));\n2120\t let config = RebalancerConfig::default();\n2121\t let migration_config = MigrationConfig::default();\n2122\t\n2123\t let rebalancer = Rebalancer::new(config, topo.clone(), migration_config);\n2124\t\n2125\t let request = AddNodeRequest {\n2126\t id: \"node-4\".into(),\n2127\t address: \"http://node-4:7700\".into(),\n2128\t replica_group: 0,\n2129\t };\n2130\t\n2131\t let result = rebalancer.add_node(request).await.unwrap();\n2132\t assert!(result.id > 0);\n2133\t assert!(result.migrations_count > 0);\n2134\t\n2135\t // Check node was added\n2136\t let topo_read = topo.read().await;\n2137\t assert!(topo_read.node(&TopologyNodeId::new(\"node-4\".into())).is_some());\n2138\t }\n2139\t\n2140\t #[tokio::test]\n2141\t async fn test_add_duplicate_node_fails() {\n2142\t let topo = Arc::new(RwLock::new(test_topology()));\n2143\t let config = RebalancerConfig::default();\n2144\t let migration_config = MigrationConfig::default();\n2145\t\n2146\t let rebalancer = Rebalancer::new(config, topo, migration_config);\n2147\t\n2148\t let request = AddNodeRequest {\n2149\t id: \"node-0\".into(), // Already exists\n2150\t address: \"http://node-0:7700\".into(),\n2151\t replica_group: 0,\n2152\t };\n2153\t\n2154\t let result = rebalancer.add_node(request).await;\n2155\t assert!(result.is_err());\n2156\t }\n2157\t\n2158\t #[tokio::test]\n2159\t async fn test_remove_last_node_fails() {\n2160\t let mut topo = Topology::new(64, 1, 1);\n2161\t topo.add_node(Node::new(\n2162\t TopologyNodeId::new(\"solo\".into()),\n2163\t \"http://solo:7700\".into(),\n2164\t 0,\n2165\t ));\n2166\t let topo = Arc::new(RwLock::new(topo));\n2167\t\n2168\t let config = RebalancerConfig::default();\n2169\t let migration_config = MigrationConfig::default();\n2170\t\n2171\t let rebalancer = Rebalancer::new(config, topo, migration_config);\n2172\t\n2173\t let request = RemoveNodeRequest {\n2174\t node_id: \"solo\".into(),\n2175\t force: false,\n2176\t };\n2177\t\n2178\t let result = rebalancer.remove_node(request).await;\n2179\t assert!(matches!(result, Err(RebalancerError::CannotRemoveLastNode)));\n2180\t }\n2181\t\n2182\t #[tokio::test]\n2183\t async fn test_handle_node_failure() {\n2184\t let topo = Arc::new(RwLock::new(test_topology()));\n2185\t let config = RebalancerConfig::default();\n2186\t let migration_config = MigrationConfig::default();\n2187\t\n2188\t let rebalancer = Rebalancer::new(config, topo.clone(), migration_config);\n2189\t\n2190\t let result = rebalancer.handle_node_failure(\"node-0\").await.unwrap();\n2191\t assert!(matches!(\n2192\t result.message.as_str(),\n2193\t \"Node node-0 marked as failed\"\n2194\t ));\n2195\t\n2196\t // Check node was marked failed\n2197\t let topo_read = topo.read().await;\n2198\t let node = topo_read.node(&TopologyNodeId::new(\"node-0\".into())).unwrap();\n2199\t assert_eq!(node.status, NodeStatus::Failed);\n2200\t }\n2201\t\n2202\t #[test]\n2203\t fn test_shard_filter() {\n2204\t let executor = HttpMigrationExecutor::new(\"test-key\".to_string(), 5000);\n2205\t assert_eq!(executor.shard_filter(42), \"_miroir_shard = 42\");\n2206\t assert_eq!(executor.shard_filter(0), \"_miroir_shard = 0\");\n2207\t }\n2208\t\n2209\t #[test]\n2210\t fn test_http_migration_executor_new() {\n2211\t let executor = HttpMigrationExecutor::new(\"master-key\".to_string(), 10000);\n2212\t assert_eq!(executor.node_master_key, \"master-key\");\n2213\t }\n2214\t}\n2215\t"}]},"parent_tool_use_id":"call_d8ab3450251e405481f12a94","session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","uuid":"fddfb5c9-e96c-4bd8-bcab-2afc53b4f073","timestamp":"2026-05-23T05:57:09.146Z"} -{"type":"system","subtype":"task_progress","task_id":"aae5896710b97f4d2","tool_use_id":"call_d8ab3450251e405481f12a94","description":"Reading crates/miroir-proxy/src/routes/admin.rs","usage":{"total_tokens":0,"tool_uses":15,"duration_ms":17055},"last_tool_name":"Read","uuid":"1e2d4578-fb09-41a6-927c-1f902f83cc47","session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97"} 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-{"type":"assistant","message":{"id":"msg_202605231357100016e4f2bbca4021","type":"message","role":"assistant","model":"glm-4.7","content":[{"type":"tool_use","id":"call_4e5b81bec62a4bd7a5b46193","name":"Read","input":{"file_path":"/home/coding/miroir/crates/miroir-core/src/topology.rs"}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":"call_d8ab3450251e405481f12a94","session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","uuid":"a7dd5814-e779-46c2-bc7b-03439e2261c5"} -{"type":"system","subtype":"task_progress","task_id":"aae5896710b97f4d2","tool_use_id":"call_d8ab3450251e405481f12a94","description":"Reading crates/miroir-core/src/task_registry.rs","usage":{"total_tokens":0,"tool_uses":19,"duration_ms":17983},"last_tool_name":"Read","uuid":"6b27c709-b48a-431f-b1e4-10beb5ded0c4","session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97"} -{"type":"assistant","message":{"id":"msg_202605231357100016e4f2bbca4021","type":"message","role":"assistant","model":"glm-4.7","content":[{"type":"tool_use","id":"call_ee21dd075c6a455a885c463b","name":"Read","input":{"file_path":"/home/coding/miroir/crates/miroir-core/src/task_registry.rs"}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":"call_d8ab3450251e405481f12a94","session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","uuid":"0c842c08-1612-4255-a7c8-c0bf355ecca4"} -{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_1b72dd1635004a97b734e342","type":"tool_result","content":"1\t//! Admin router for /_miroir/* endpoints.\n2\t//!\n3\t//! This router requires `admin_endpoints::AppState` to be provided via `.with_state()`.\n4\t\n5\tuse axum::{\n6\t extract::FromRef,\n7\t routing::{delete, get, post, put},\n8\t Router,\n9\t};\n10\tuse super::{admin_endpoints, aliases, canary, explain, session};\n11\t\n12\t/// Create the admin router with all /_miroir/* endpoints.\n13\t///\n14\t/// Returns a stateless router that must be given a state via `.with_state()`\n15\t/// before use. The state type must implement `FromRef` to extract\n16\t/// `admin_endpoints::AppState`.\n17\tpub fn router() -> Router\n18\twhere\n19\t S: Clone + Send + Sync + 'static,\n20\t admin_endpoints::AppState: FromRef,\n21\t aliases::AliasState: FromRef,\n22\t explain::ExplainState: FromRef,\n23\t canary::CanaryState: FromRef,\n24\t{\n25\t Router::new()\n26\t // Admin session endpoints (plan §9, §13.19)\n27\t .route(\"/admin/login\", post(session::admin_login::))\n28\t .route(\"/admin/session\", get(session::admin_session::))\n29\t .route(\"/admin/logout\", post(session::admin_logout::))\n30\t // Search UI session endpoint (plan §9, §13.21)\n31\t .route(\n32\t \"/ui/search/{index}/session\",\n33\t get(session::search_ui_session::),\n34\t )\n35\t // Admin API endpoints\n36\t .route(\"/topology\", get(admin_endpoints::get_topology::))\n37\t .route(\"/shards\", get(admin_endpoints::get_shards::))\n38\t .route(\"/ready\", get(admin_endpoints::get_ready::))\n39\t .route(\"/metrics\", get(admin_endpoints::get_metrics::))\n40\t .route(\n41\t \"/ui/search/{index}/rotate-scoped-key\",\n42\t post(admin_endpoints::rotate_scoped_key_handler),\n43\t )\n44\t // Alias management (plan §13.7)\n45\t .route(\"/aliases\", get(aliases::list_aliases::))\n46\t .route(\"/aliases/{name}\", post(aliases::create_alias::))\n47\t .route(\"/aliases/{name}\", get(aliases::get_alias::))\n48\t .route(\"/aliases/{name}\", put(aliases::update_alias::))\n49\t .route(\"/aliases/{name}\", delete(aliases::delete_alias::))\n50\t // Canary management (plan §13.18)\n51\t .route(\"/canaries\", post(canary::create_canary::))\n52\t .route(\"/canaries\", get(canary::get_canary_status::))\n53\t .route(\"/canaries/{id}\", get(canary::get_canary::))\n54\t .route(\"/canaries/{id}\", put(canary::update_canary::))\n55\t .route(\"/canaries/{id}\", delete(canary::delete_canary::))\n56\t .route(\"/canaries/capture\", post(canary::start_capture::))\n57\t .route(\"/canaries/captured\", get(canary::get_captured::))\n58\t .route(\"/canaries/from-capture/{index}\", post(canary::create_from_capture::))\n59\t // Explain endpoint (plan §13.20)\n60\t .route(\"/indexes/{index}/explain\", post(explain::explain_search::))\n61\t // Node management (plan §2 node addition flow)\n62\t .route(\"/nodes\", post(admin_endpoints::add_node::))\n63\t .route(\"/nodes/{id}\", delete(admin_endpoints::remove_node::))\n64\t .route(\"/nodes/{id}/drain\", post(admin_endpoints::drain_node::))\n65\t .route(\"/nodes/{id}/fail\", post(admin_endpoints::fail_node::))\n66\t .route(\"/nodes/{id}/recover\", post(admin_endpoints::recover_node::))\n67\t // Rebalancer status\n68\t .route(\"/rebalance/status\", get(admin_endpoints::get_rebalance_status::))\n69\t // Replica group management\n70\t .route(\"/replica_groups\", post(admin_endpoints::add_replica_group::))\n71\t .route(\"/replica_groups/{id}\", delete(admin_endpoints::remove_replica_group::))\n72\t}\n73\t"}]},"parent_tool_use_id":"call_d8ab3450251e405481f12a94","session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","uuid":"b62d9972-b075-41fe-a0eb-5bc09ddf8e69","timestamp":"2026-05-23T05:57:15.801Z"} -{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_4e5b81bec62a4bd7a5b46193","type":"tool_result","content":"1\t//! Topology management: node registry, groups, health state, and state machine.\n2\t\n3\tuse crate::error::{MiroirError, Result};\n4\tuse serde::{Deserialize, Deserializer, Serialize, Serializer};\n5\tuse std::collections::HashMap;\n6\tuse std::time::Instant;\n7\t\n8\t/// Unique identifier for a node.\n9\t#[derive(Debug, Clone, Hash, PartialEq, Eq, Serialize, Deserialize)]\n10\tpub struct NodeId(String);\n11\t\n12\timpl NodeId {\n13\t pub fn new(id: String) -> Self {\n14\t Self(id)\n15\t }\n16\t\n17\t pub fn as_str(&self) -> &str {\n18\t &self.0\n19\t }\n20\t}\n21\t\n22\timpl From for NodeId {\n23\t fn from(s: String) -> Self {\n24\t Self(s)\n25\t }\n26\t}\n27\t\n28\timpl AsRef for NodeId {\n29\t fn as_ref(&self) -> &str {\n30\t &self.0\n31\t }\n32\t}\n33\t\n34\timpl std::fmt::Display for NodeId {\n35\t fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {\n36\t self.0.fmt(f)\n37\t }\n38\t}\n39\t\n40\t/// Health status of a node, with state-machine transitions.\n41\t#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]\n42\t#[serde(rename_all = \"snake_case\")]\n43\tpub enum NodeStatus {\n44\t /// Node is healthy and serving traffic.\n45\t #[default]\n46\t Healthy,\n47\t /// Node is degraded (timeouts, not full disconnect) but still serving.\n48\t Degraded,\n49\t /// Node is draining — graceful shutdown, still serves shards it owns.\n50\t Draining,\n51\t /// Node has failed (unplanned outage).\n52\t Failed,\n53\t /// Node is joining the cluster (being provisioned).\n54\t Joining,\n55\t /// Node is active — fully operational after joining.\n56\t Active,\n57\t /// Node has been removed from the cluster.\n58\t Removed,\n59\t}\n60\t\n61\timpl NodeStatus {\n62\t /// Attempt a state transition. Returns the new status on success.\n63\t ///\n64\t /// Legal transitions (plan §2 topology-change verbs):\n65\t /// - (new) → Joining (admin API: POST /_miroir/nodes)\n66\t /// - Joining → Active (migration complete)\n67\t /// - Active → Draining (admin API: POST /_miroir/nodes/{id}/drain)\n68\t /// - Draining → Removed (migration complete)\n69\t /// - Active/Draining → Failed (health check detects failure)\n70\t /// - Failed → Active (health check recovery)\n71\t /// - Active/Failed → Degraded (partial health: timeouts)\n72\t /// - Degraded → Active (health restored)\n73\t pub fn transition_to(self, target: NodeStatus) -> Result {\n74\t use NodeStatus::*;\n75\t\n76\t let legal = match (self, target) {\n77\t // Normal lifecycle\n78\t (Joining, Active) => true,\n79\t (Active, Draining) => true,\n80\t (Draining, Removed) => true,\n81\t\n82\t // Failure detection\n83\t (Active, Failed) => true,\n84\t (Draining, Failed) => true,\n85\t\n86\t // Recovery\n87\t (Failed, Active) => true,\n88\t\n89\t // Degraded\n90\t (Active, Degraded) => true,\n91\t (Failed, Degraded) => true,\n92\t (Degraded, Active) => true,\n93\t\n94\t // Idempotent\n95\t (Active, Active)\n96\t | (Failed, Failed)\n97\t | (Degraded, Degraded)\n98\t | (Joining, Joining)\n99\t | (Draining, Draining) => true,\n100\t\n101\t // Healthy is an alias for Active in transitions\n102\t (Healthy, _) | (_, Healthy) => false,\n103\t\n104\t _ => false,\n105\t };\n106\t\n107\t if legal {\n108\t Ok(target)\n109\t } else {\n110\t Err(MiroirError::Topology(format!(\n111\t \"illegal state transition: {:?} → {:?}\",\n112\t self, target\n113\t )))\n114\t }\n115\t }\n116\t\n117\t /// Check if a node in this status is serving reads.\n118\t pub fn is_readable(self) -> bool {\n119\t matches!(\n120\t self,\n121\t NodeStatus::Active | NodeStatus::Healthy | NodeStatus::Degraded | NodeStatus::Draining\n122\t )\n123\t }\n124\t\n125\t /// Check if a node in this status can accept any writes unconditionally.\n126\t pub fn is_active(self) -> bool {\n127\t matches!(self, NodeStatus::Active | NodeStatus::Healthy | NodeStatus::Degraded)\n128\t }\n129\t}\n130\t\n131\t/// A single Meilisearch node in the topology.\n132\t#[derive(Debug, Clone, Serialize, Deserialize)]\n133\tpub struct Node {\n134\t /// Unique node identifier.\n135\t pub id: NodeId,\n136\t\n137\t /// Node base URL (e.g., \"http://meili-0.search.svc:7700\").\n138\t pub address: String,\n139\t\n140\t /// Current health status.\n141\t #[serde(default)]\n142\t pub status: NodeStatus,\n143\t\n144\t /// Replica group assignment (0-based).\n145\t pub replica_group: u32,\n146\t\n147\t /// Instant of the last successful health check.\n148\t #[serde(skip)]\n149\t pub last_seen: Option,\n150\t\n151\t /// Error message from the last failed health check.\n152\t #[serde(skip_serializing_if = \"Option::is_none\")]\n153\t pub last_error: Option,\n154\t}\n155\t\n156\timpl Node {\n157\t /// Create a new node (starts in Joining state).\n158\t pub fn new(id: NodeId, address: String, replica_group: u32) -> Self {\n159\t Self {\n160\t id,\n161\t address,\n162\t status: NodeStatus::Joining,\n163\t replica_group,\n164\t last_seen: None,\n165\t last_error: None,\n166\t }\n167\t }\n168\t\n169\t /// Check if this node can receive writes for a shard.\n170\t ///\n171\t /// `shard_affected` is true when the shard is being migrated away from this\n172\t /// node during a drain. Draining nodes still accept writes for shards they\n173\t /// still own (`shard_affected = false`).\n174\t pub fn is_write_eligible_for(&self, shard_affected: bool) -> bool {\n175\t match self.status {\n176\t NodeStatus::Active | NodeStatus::Healthy | NodeStatus::Degraded => true,\n177\t NodeStatus::Draining => !shard_affected,\n178\t NodeStatus::Joining | NodeStatus::Failed | NodeStatus::Removed => false,\n179\t }\n180\t }\n181\t\n182\t /// Check if the node is healthy (can serve traffic).\n183\t pub fn is_healthy(&self) -> bool {\n184\t matches!(\n185\t self.status,\n186\t NodeStatus::Active | NodeStatus::Healthy | NodeStatus::Degraded\n187\t )\n188\t }\n189\t\n190\t /// Attempt a state transition on this node.\n191\t pub fn transition_to(&mut self, target: NodeStatus) -> Result<()> {\n192\t self.status = self.status.transition_to(target)?;\n193\t Ok(())\n194\t }\n195\t}\n196\t\n197\t/// A replica group: an independent query pool.\n198\t///\n199\t/// Each group holds all S shards, distributed across its nodes.\n200\t/// Reads are routed to a single group per query.\n201\t#[derive(Debug, Clone, Serialize, Deserialize)]\n202\tpub struct Group {\n203\t /// Group identifier (0-based).\n204\t pub id: u32,\n205\t\n206\t /// Node IDs in this group.\n207\t nodes: Vec,\n208\t}\n209\t\n210\timpl Group {\n211\t /// Create a new group.\n212\t pub fn new(id: u32) -> Self {\n213\t Self {\n214\t id,\n215\t nodes: Vec::new(),\n216\t }\n217\t }\n218\t\n219\t /// Add a node to this group.\n220\t pub fn add_node(&mut self, node_id: NodeId) {\n221\t if !self.nodes.contains(&node_id) {\n222\t self.nodes.push(node_id);\n223\t }\n224\t }\n225\t\n226\t /// Get the node IDs in this group.\n227\t pub fn nodes(&self) -> &[NodeId] {\n228\t &self.nodes\n229\t }\n230\t\n231\t /// Get the number of nodes in this group.\n232\t pub fn node_count(&self) -> usize {\n233\t self.nodes.len()\n234\t }\n235\t\n236\t /// Get healthy (Active/Healthy/Degraded) nodes in this group.\n237\t ///\n238\t /// Requires the topology's node map to resolve node IDs to full `Node` refs.\n239\t pub fn healthy_nodes<'a>(&self, node_map: &'a HashMap) -> Vec<&'a Node> {\n240\t self.nodes\n241\t .iter()\n242\t .filter_map(|id| node_map.get(id))\n243\t .filter(|n| n.is_healthy())\n244\t .collect()\n245\t }\n246\t}\n247\t\n248\t/// Cluster topology: groups, nodes, and health state.\n249\t///\n250\t/// Serializes/deserializes from plan §4 YAML format:\n251\t/// ```yaml\n252\t/// shards: 64\n253\t/// replica_groups: 2\n254\t/// rf: 1\n255\t/// nodes:\n256\t/// - id: \"meili-0\"\n257\t/// address: \"http://meili-0:7700\"\n258\t/// replica_group: 0\n259\t/// ```\n260\t///\n261\t/// Groups are derived from node `replica_group` fields and rebuilt automatically.\n262\t#[derive(Debug, Clone)]\n263\tpub struct Topology {\n264\t /// Total number of logical shards.\n265\t pub shards: u32,\n266\t\n267\t /// Number of replica groups.\n268\t pub replica_groups: u32,\n269\t\n270\t /// Replication factor (intra-group).\n271\t pub rf: usize,\n272\t\n273\t /// All nodes in the cluster.\n274\t pub nodes: Vec,\n275\t\n276\t /// Derived group index (rebuilt from nodes).\n277\t groups: Vec,\n278\t\n279\t /// Node ID → Vec index lookup.\n280\t node_index: HashMap,\n281\t}\n282\t\n283\timpl Topology {\n284\t /// Create a new empty topology.\n285\t pub fn new(shards: u32, replica_groups: u32, rf: usize) -> Self {\n286\t Self {\n287\t shards,\n288\t replica_groups,\n289\t rf,\n290\t nodes: Vec::new(),\n291\t groups: (0..replica_groups).map(Group::new).collect(),\n292\t node_index: HashMap::new(),\n293\t }\n294\t }\n295\t\n296\t /// Add a node to the topology.\n297\t pub fn add_node(&mut self, node: Node) {\n298\t let idx = self.nodes.len();\n299\t self.node_index.insert(node.id.clone(), idx);\n300\t let group_id = node.replica_group;\n301\t self.nodes.push(node);\n302\t self.rebuild_groups();\n303\t self.replica_groups = self.replica_groups.max(group_id + 1);\n304\t }\n305\t\n306\t /// Get a node by ID.\n307\t pub fn node(&self, id: &NodeId) -> Option<&Node> {\n308\t self.node_index.get(id).map(|&i| &self.nodes[i])\n309\t }\n310\t\n311\t /// Get a mutable node by ID.\n312\t pub fn node_mut(&mut self, id: &NodeId) -> Option<&mut Node> {\n313\t self.node_index.get(id).copied().map(move |i| &mut self.nodes[i])\n314\t }\n315\t\n316\t /// Iterate over all nodes.\n317\t pub fn nodes(&self) -> impl Iterator {\n318\t self.nodes.iter()\n319\t }\n320\t\n321\t /// Get a group by ID.\n322\t pub fn group(&self, id: u32) -> Option<&Group> {\n323\t self.groups.get(id as usize)\n324\t }\n325\t\n326\t /// Iterate over all groups in ascending order by ID.\n327\t pub fn groups(&self) -> impl Iterator {\n328\t self.groups.iter()\n329\t }\n330\t\n331\t /// Get the replication factor.\n332\t pub fn rf(&self) -> usize {\n333\t self.rf\n334\t }\n335\t\n336\t /// Get the number of replica groups.\n337\t pub fn replica_group_count(&self) -> u32 {\n338\t self.groups.len() as u32\n339\t }\n340\t\n341\t /// Build a HashMap for use with Group::healthy_nodes.\n342\t pub fn node_map(&self) -> HashMap {\n343\t self.nodes.iter().map(|n| (n.id.clone(), n.clone())).collect()\n344\t }\n345\t\n346\t /// Remove a node from the topology.\n347\t pub fn remove_node(&mut self, id: &NodeId) -> bool {\n348\t if let Some(&idx) = self.node_index.get(id) {\n349\t self.node_index.remove(id);\n350\t self.nodes.remove(idx);\n351\t // Rebuild indices\n352\t self.node_index.clear();\n353\t for (i, node) in self.nodes.iter().enumerate() {\n354\t self.node_index.insert(node.id.clone(), i);\n355\t }\n356\t self.rebuild_groups();\n357\t true\n358\t } else {\n359\t false\n360\t }\n361\t }\n362\t\n363\t /// Remove all nodes in a replica group and the group itself.\n364\t pub fn remove_group(&mut self, group_id: u32) -> bool {\n365\t // Find all nodes in this group\n366\t let nodes_to_remove: Vec = self\n367\t .nodes\n368\t .iter()\n369\t .filter(|n| n.replica_group == group_id)\n370\t .map(|n| n.id.clone())\n371\t .collect();\n372\t\n373\t if nodes_to_remove.is_empty() {\n374\t return false;\n375\t }\n376\t\n377\t // Remove all nodes in the group\n378\t for node_id in nodes_to_remove {\n379\t self.remove_node(&node_id);\n380\t }\n381\t\n382\t true\n383\t }\n384\t\n385\t fn rebuild_groups(&mut self) {\n386\t let num_groups = self\n387\t .nodes\n388\t .iter()\n389\t .map(|n| n.replica_group)\n390\t .max()\n391\t .map_or(self.replica_groups as usize, |m| (m as usize + 1).max(self.replica_groups as usize));\n392\t\n393\t self.groups = (0..num_groups).map(|i| Group::new(i as u32)).collect();\n394\t for node in &self.nodes {\n395\t if let Some(group) = self.groups.get_mut(node.replica_group as usize) {\n396\t group.add_node(node.id.clone());\n397\t }\n398\t }\n399\t }\n400\t}\n401\t\n402\timpl Serialize for Topology {\n403\t fn serialize(&self, serializer: S) -> std::result::Result {\n404\t #[derive(Serialize)]\n405\t struct TopologyData {\n406\t shards: u32,\n407\t replica_groups: u32,\n408\t rf: usize,\n409\t nodes: Vec,\n410\t }\n411\t TopologyData {\n412\t shards: self.shards,\n413\t replica_groups: self.replica_groups,\n414\t rf: self.rf,\n415\t nodes: self.nodes.clone(),\n416\t }\n417\t .serialize(serializer)\n418\t }\n419\t}\n420\t\n421\timpl<'de> Deserialize<'de> for Topology {\n422\t fn deserialize>(deserializer: D) -> std::result::Result {\n423\t #[derive(Deserialize)]\n424\t struct TopologyData {\n425\t shards: u32,\n426\t #[serde(default)]\n427\t replica_groups: u32,\n428\t #[serde(alias = \"replication_factor\", default)]\n429\t rf: usize,\n430\t #[serde(default)]\n431\t nodes: Vec,\n432\t }\n433\t\n434\t let data = TopologyData::deserialize(deserializer)?;\n435\t let mut topo = Self {\n436\t shards: data.shards,\n437\t replica_groups: data.replica_groups,\n438\t rf: data.rf,\n439\t nodes: data.nodes,\n440\t groups: Vec::new(),\n441\t node_index: HashMap::new(),\n442\t };\n443\t // Build lookup index\n444\t for (i, node) in topo.nodes.iter().enumerate() {\n445\t topo.node_index.insert(node.id.clone(), i);\n446\t }\n447\t // Derive replica_groups from nodes if not set\n448\t if topo.replica_groups == 0 && !topo.nodes.is_empty() {\n449\t topo.replica_groups = topo.nodes.iter().map(|n| n.replica_group).max().unwrap() + 1;\n450\t }\n451\t topo.rebuild_groups();\n452\t Ok(topo)\n453\t }\n454\t}\n455\t\n456\t#[cfg(test)]\n457\tmod tests {\n458\t use super::*;\n459\t\n460\t // ── YAML deserialization ──────────────────────────────────────────\n461\t\n462\t #[test]\n463\t fn deserialize_plan_s4_yaml_example() {\n464\t let yaml = r#\"\n465\tshards: 64\n466\treplica_groups: 2\n467\trf: 1\n468\tnodes:\n469\t - id: \"meili-0\"\n470\t address: \"http://meili-0.search.svc:7700\"\n471\t replica_group: 0\n472\t - id: \"meili-1\"\n473\t address: \"http://meili-1.search.svc:7700\"\n474\t replica_group: 0\n475\t - id: \"meili-2\"\n476\t address: \"http://meili-2.search.svc:7700\"\n477\t replica_group: 0\n478\t - id: \"meili-3\"\n479\t address: \"http://meili-3.search.svc:7700\"\n480\t replica_group: 1\n481\t - id: \"meili-4\"\n482\t address: \"http://meili-4.search.svc:7700\"\n483\t replica_group: 1\n484\t - id: \"meili-5\"\n485\t address: \"http://meili-5.search.svc:7700\"\n486\t replica_group: 1\n487\t\"#;\n488\t let topo: Topology = serde_yaml::from_str(yaml).unwrap();\n489\t assert_eq!(topo.shards, 64);\n490\t assert_eq!(topo.replica_groups, 2);\n491\t assert_eq!(topo.rf, 1);\n492\t assert_eq!(topo.nodes.len(), 6);\n493\t\n494\t // All nodes default to Healthy (first variant, used as serde default)\n495\t for node in &topo.nodes {\n496\t assert_eq!(node.status, NodeStatus::Healthy);\n497\t }\n498\t }\n499\t\n500\t #[test]\n501\t fn deserialize_with_replication_factor_alias() {\n502\t let yaml = r#\"\n503\tshards: 32\n504\treplica_groups: 1\n505\treplication_factor: 2\n506\tnodes:\n507\t - id: \"n0\"\n508\t address: \"http://n0:7700\"\n509\t replica_group: 0\n510\t\"#;\n511\t let topo: Topology = serde_yaml::from_str(yaml).unwrap();\n512\t assert_eq!(topo.rf, 2);\n513\t }\n514\t\n515\t // ── Groups iterator ───────────────────────────────────────────────\n516\t\n517\t #[test]\n518\t fn groups_returns_rg_groups_in_ascending_order() {\n519\t let topo = make_test_topology();\n520\t let groups: Vec<&Group> = topo.groups().collect();\n521\t assert_eq!(groups.len(), 2);\n522\t assert_eq!(groups[0].id, 0);\n523\t assert_eq!(groups[1].id, 1);\n524\t }\n525\t\n526\t #[test]\n527\t fn each_group_holds_exactly_its_configured_nodes() {\n528\t let topo = make_test_topology();\n529\t let g0 = topo.group(0).unwrap();\n530\t let g1 = topo.group(1).unwrap();\n531\t\n532\t assert_eq!(g0.node_count(), 3);\n533\t assert_eq!(g1.node_count(), 3);\n534\t\n535\t // Group 0: meili-{0,1,2}\n536\t let g0_ids: Vec<&str> = g0.nodes().iter().map(|n| n.as_str()).collect();\n537\t assert!(g0_ids.contains(&\"meili-0\"));\n538\t assert!(g0_ids.contains(&\"meili-1\"));\n539\t assert!(g0_ids.contains(&\"meili-2\"));\n540\t\n541\t // Group 1: meili-{3,4,5}\n542\t let g1_ids: Vec<&str> = g1.nodes().iter().map(|n| n.as_str()).collect();\n543\t assert!(g1_ids.contains(&\"meili-3\"));\n544\t assert!(g1_ids.contains(&\"meili-4\"));\n545\t assert!(g1_ids.contains(&\"meili-5\"));\n546\t }\n547\t\n548\t #[test]\n549\t fn topology_nodes_iterator() {\n550\t let topo = make_test_topology();\n551\t let all_nodes: Vec<&Node> = topo.nodes().collect();\n552\t assert_eq!(all_nodes.len(), 6);\n553\t }\n554\t\n555\t #[test]\n556\t fn deserialize_auto_derives_replica_groups() {\n557\t let yaml = r#\"\n558\tshards: 32\n559\trf: 1\n560\tnodes:\n561\t - id: \"n0\"\n562\t address: \"http://n0:7700\"\n563\t replica_group: 2\n564\t - id: \"n1\"\n565\t address: \"http://n1:7700\"\n566\t replica_group: 2\n567\t\"#;\n568\t let topo: Topology = serde_yaml::from_str(yaml).unwrap();\n569\t assert_eq!(topo.replica_groups, 3);\n570\t }\n571\t\n572\t // ── State machine ─────────────────────────────────────────────────\n573\t\n574\t #[test]\n575\t fn legal_transitions() {\n576\t use NodeStatus::*;\n577\t\n578\t let cases: Vec<(NodeStatus, NodeStatus)> = vec![\n579\t (Joining, Active),\n580\t (Active, Draining),\n581\t (Draining, Removed),\n582\t (Active, Failed),\n583\t (Draining, Failed),\n584\t (Failed, Active),\n585\t (Active, Degraded),\n586\t (Failed, Degraded),\n587\t (Degraded, Active),\n588\t // Idempotent\n589\t (Active, Active),\n590\t (Failed, Failed),\n591\t (Degraded, Degraded),\n592\t (Joining, Joining),\n593\t (Draining, Draining),\n594\t ];\n595\t\n596\t for (from, to) in cases {\n597\t assert!(\n598\t from.transition_to(to).is_ok(),\n599\t \"expected {:?} → {:?} to succeed\",\n600\t from,\n601\t to\n602\t );\n603\t }\n604\t }\n605\t\n606\t #[test]\n607\t fn illegal_transitions() {\n608\t use NodeStatus::*;\n609\t\n610\t let cases: Vec<(NodeStatus, NodeStatus)> = vec![\n611\t // Skip steps\n612\t (Joining, Draining),\n613\t (Joining, Failed),\n614\t (Joining, Removed),\n615\t (Joining, Degraded),\n616\t // Can't go back from Draining to Active\n617\t (Draining, Active),\n618\t (Draining, Joining),\n619\t // Can't recover to Joining\n620\t (Active, Joining),\n621\t (Failed, Joining),\n622\t (Degraded, Joining),\n623\t // Removed is terminal\n624\t (Removed, Active),\n625\t (Removed, Joining),\n626\t (Removed, Failed),\n627\t (Removed, Degraded),\n628\t (Removed, Draining),\n629\t // Healthy not used in transitions\n630\t (Healthy, Active),\n631\t (Active, Healthy),\n632\t // More illegal paths\n633\t (Failed, Draining),\n634\t (Failed, Removed),\n635\t (Degraded, Failed),\n636\t (Degraded, Draining),\n637\t (Degraded, Removed),\n638\t ];\n639\t\n640\t for (from, to) in cases {\n641\t let result = from.transition_to(to);\n642\t assert!(\n643\t result.is_err(),\n644\t \"expected {:?} → {:?} to be rejected, but got Ok({:?})\",\n645\t from,\n646\t to,\n647\t result.unwrap()\n648\t );\n649\t }\n650\t }\n651\t\n652\t #[test]\n653\t fn node_transition_method() {\n654\t let mut node = Node::new(\n655\t NodeId::new(\"n0\".into()),\n656\t \"http://n0:7700\".into(),\n657\t 0,\n658\t );\n659\t assert_eq!(node.status, NodeStatus::Joining);\n660\t\n661\t node.transition_to(NodeStatus::Active).unwrap();\n662\t assert_eq!(node.status, NodeStatus::Active);\n663\t\n664\t // Illegal: Active → Joining\n665\t assert!(node.transition_to(NodeStatus::Joining).is_err());\n666\t assert_eq!(node.status, NodeStatus::Active); // unchanged\n667\t }\n668\t\n669\t #[test]\n670\t fn full_lifecycle_joining_to_removed() {\n671\t let mut node = Node::new(\n672\t NodeId::new(\"n0\".into()),\n673\t \"http://n0:7700\".into(),\n674\t 0,\n675\t );\n676\t assert_eq!(node.status, NodeStatus::Joining);\n677\t\n678\t node.transition_to(NodeStatus::Active).unwrap();\n679\t assert_eq!(node.status, NodeStatus::Active);\n680\t\n681\t node.transition_to(NodeStatus::Draining).unwrap();\n682\t assert_eq!(node.status, NodeStatus::Draining);\n683\t\n684\t node.transition_to(NodeStatus::Removed).unwrap();\n685\t assert_eq!(node.status, NodeStatus::Removed);\n686\t }\n687\t\n688\t #[test]\n689\t fn failure_recovery_path() {\n690\t let mut node = Node::new(NodeId::new(\"n0\".into()), \"http://n0:7700\".into(), 0);\n691\t node.transition_to(NodeStatus::Active).unwrap();\n692\t node.transition_to(NodeStatus::Failed).unwrap();\n693\t node.transition_to(NodeStatus::Degraded).unwrap();\n694\t node.transition_to(NodeStatus::Active).unwrap();\n695\t assert_eq!(node.status, NodeStatus::Active);\n696\t }\n697\t\n698\t // ── Write eligibility ─────────────────────────────────────────────\n699\t\n700\t #[test]\n701\t fn write_eligibility_correctness_table() {\n702\t use NodeStatus::*;\n703\t\n704\t // (status, shard_affected, expected_write_eligible)\n705\t let cases: Vec<(NodeStatus, bool, bool)> = vec![\n706\t // Active/Healthy/Degraded: always eligible\n707\t (Active, true, true),\n708\t (Active, false, true),\n709\t (Healthy, true, true),\n710\t (Healthy, false, true),\n711\t (Degraded, true, true),\n712\t (Degraded, false, true),\n713\t\n714\t // Draining: eligible only for shards still owned (not affected)\n715\t (Draining, false, true),\n716\t (Draining, true, false),\n717\t\n718\t // Joining/Failed/Removed: never eligible\n719\t (Joining, false, false),\n720\t (Joining, true, false),\n721\t (Failed, false, false),\n722\t (Failed, true, false),\n723\t (Removed, false, false),\n724\t (Removed, true, false),\n725\t ];\n726\t\n727\t for (status, shard_affected, expected) in cases {\n728\t let node = Node {\n729\t id: NodeId::new(\"test\".into()),\n730\t address: \"http://test:7700\".into(),\n731\t replica_group: 0,\n732\t status,\n733\t last_seen: None,\n734\t last_error: None,\n735\t };\n736\t let result = node.is_write_eligible_for(shard_affected);\n737\t assert_eq!(\n738\t result, expected,\n739\t \"is_write_eligible_for(shard_affected={}) with status {:?} = {}, expected {}\",\n740\t shard_affected, status, result, expected\n741\t );\n742\t }\n743\t }\n744\t\n745\t // ── Group healthy_nodes ───────────────────────────────────────────\n746\t\n747\t #[test]\n748\t fn healthy_nodes_returns_only_active_nodes() {\n749\t let mut topo = make_test_topology();\n750\t\n751\t // Activate first 4 nodes, fail the 5th, leave 6th as Joining\n752\t for i in 0..4 {\n753\t topo.nodes[i].status = NodeStatus::Active;\n754\t }\n755\t topo.nodes[4].status = NodeStatus::Failed;\n756\t topo.nodes[5].status = NodeStatus::Joining;\n757\t\n758\t let node_map = topo.node_map();\n759\t let g0_healthy = topo.group(0).unwrap().healthy_nodes(&node_map);\n760\t let g1_healthy = topo.group(1).unwrap().healthy_nodes(&node_map);\n761\t\n762\t // Group 0: nodes 0,1,2 all Active\n763\t assert_eq!(g0_healthy.len(), 3);\n764\t // Group 1: node 3 Active, node 4 Failed, node 5 Joining\n765\t assert_eq!(g1_healthy.len(), 1);\n766\t assert_eq!(g1_healthy[0].id, NodeId::new(\"meili-3\".into()));\n767\t }\n768\t\n769\t #[test]\n770\t fn healthy_nodes_includes_degraded() {\n771\t let mut topo = make_test_topology();\n772\t topo.nodes[0].status = NodeStatus::Active;\n773\t topo.nodes[1].status = NodeStatus::Degraded;\n774\t topo.nodes[2].status = NodeStatus::Failed;\n775\t\n776\t let node_map = topo.node_map();\n777\t let healthy = topo.group(0).unwrap().healthy_nodes(&node_map);\n778\t assert_eq!(healthy.len(), 2);\n779\t }\n780\t\n781\t // ── Topology serialization round-trip ─────────────────────────────\n782\t\n783\t #[test]\n784\t fn topology_round_trip_yaml() {\n785\t let mut topo = Topology::new(64, 2, 1);\n786\t for i in 0..6 {\n787\t let rg = if i < 3 { 0 } else { 1 };\n788\t topo.add_node(Node::new(\n789\t NodeId::new(format!(\"meili-{i}\")),\n790\t format!(\"http://meili-{i}.search.svc:7700\"),\n791\t rg,\n792\t ));\n793\t }\n794\t\n795\t let yaml = serde_yaml::to_string(&topo).unwrap();\n796\t let topo2: Topology = serde_yaml::from_str(&yaml).unwrap();\n797\t\n798\t assert_eq!(topo2.shards, 64);\n799\t assert_eq!(topo2.replica_groups, 2);\n800\t assert_eq!(topo2.rf, 1);\n801\t assert_eq!(topo2.nodes.len(), 6);\n802\t assert_eq!(topo2.group(0).unwrap().node_count(), 3);\n803\t assert_eq!(topo2.group(1).unwrap().node_count(), 3);\n804\t }\n805\t\n806\t // ── NodeId conversions ────────────────────────────────────────────\n807\t\n808\t #[test]\n809\t fn nodeid_from_string_and_as_ref() {\n810\t let id: NodeId = \"test-node\".to_string().into();\n811\t assert_eq!(id.as_str(), \"test-node\");\n812\t assert_eq!(AsRef::::as_ref(&id), \"test-node\");\n813\t }\n814\t\n815\t #[test]\n816\t fn nodeid_display_impl() {\n817\t let id = NodeId::new(\"my-node\".to_string());\n818\t assert_eq!(format!(\"{}\", id), \"my-node\");\n819\t }\n820\t\n821\t // ── NodeStatus helpers ────────────────────────────────────────────\n822\t\n823\t #[test]\n824\t fn is_readable_covers_all_statuses() {\n825\t use NodeStatus::*;\n826\t assert!(Active.is_readable());\n827\t assert!(Healthy.is_readable());\n828\t assert!(Degraded.is_readable());\n829\t assert!(Draining.is_readable());\n830\t assert!(!Failed.is_readable());\n831\t assert!(!Joining.is_readable());\n832\t assert!(!Removed.is_readable());\n833\t }\n834\t\n835\t #[test]\n836\t fn is_active_covers_all_statuses() {\n837\t use NodeStatus::*;\n838\t assert!(Active.is_active());\n839\t assert!(Healthy.is_active());\n840\t assert!(Degraded.is_active());\n841\t assert!(!Draining.is_active());\n842\t assert!(!Failed.is_active());\n843\t assert!(!Joining.is_active());\n844\t assert!(!Removed.is_active());\n845\t }\n846\t\n847\t // ── Node::is_healthy ──────────────────────────────────────────────\n848\t\n849\t #[test]\n850\t fn node_is_healthy_covers_all_statuses() {\n851\t use NodeStatus::*;\n852\t for (status, expected) in [\n853\t (Active, true),\n854\t (Healthy, true),\n855\t (Degraded, true),\n856\t (Draining, false),\n857\t (Failed, false),\n858\t (Joining, false),\n859\t (Removed, false),\n860\t ] {\n861\t let node = Node {\n862\t id: NodeId::new(\"test\".into()),\n863\t address: \"http://test:7700\".into(),\n864\t replica_group: 0,\n865\t status,\n866\t last_seen: None,\n867\t last_error: None,\n868\t };\n869\t assert_eq!(node.is_healthy(), expected, \"{:?} is_healthy\", status);\n870\t }\n871\t }\n872\t\n873\t // ── Group::add_node duplicate prevention ──────────────────────────\n874\t\n875\t #[test]\n876\t fn group_add_node_prevents_duplicates() {\n877\t let mut g = Group::new(0);\n878\t g.add_node(NodeId::new(\"a\".into()));\n879\t g.add_node(NodeId::new(\"a\".into()));\n880\t g.add_node(NodeId::new(\"b\".into()));\n881\t assert_eq!(g.node_count(), 2);\n882\t }\n883\t\n884\t // ── Topology with auto-derived replica_groups ─────────────────────\n885\t\n886\t #[test]\n887\t fn topology_auto_derives_replica_groups_from_nodes() {\n888\t let mut topo = Topology::new(64, 1, 1);\n889\t topo.add_node(Node::new(NodeId::new(\"n0\".into()), \"http://n0:7700\".into(), 0));\n890\t topo.add_node(Node::new(NodeId::new(\"n1\".into()), \"http://n1:7700\".into(), 2));\n891\t // replica_groups should auto-derive to 3\n892\t assert_eq!(topo.replica_groups, 3);\n893\t assert!(topo.group(2).is_some());\n894\t }\n895\t\n896\t #[test]\n897\t fn topology_node_lookup() {\n898\t let mut topo = make_test_topology();\n899\t assert!(topo.node(&NodeId::new(\"meili-0\".into())).is_some());\n900\t assert!(topo.node(&NodeId::new(\"nonexistent\".into())).is_none());\n901\t\n902\t // Mutate via node_mut\n903\t let id = NodeId::new(\"meili-0\".into());\n904\t topo.node_mut(&id).unwrap().status = NodeStatus::Failed;\n905\t assert_eq!(topo.node(&id).unwrap().status, NodeStatus::Failed);\n906\t }\n907\t\n908\t #[test]\n909\t fn topology_replica_group_count() {\n910\t let topo = make_test_topology();\n911\t assert_eq!(topo.replica_group_count(), 2);\n912\t }\n913\t\n914\t // ── Helpers ───────────────────────────────────────────────────────\n915\t\n916\t fn make_test_topology() -> Topology {\n917\t let mut topo = Topology::new(64, 2, 1);\n918\t for i in 0..6 {\n919\t let rg = if i < 3 { 0 } else { 1 };\n920\t let mut node = Node::new(\n921\t NodeId::new(format!(\"meili-{i}\")),\n922\t format!(\"http://meili-{i}.search.svc:7700\"),\n923\t rg,\n924\t );\n925\t // Default from Node::new is Joining, set to Active for tests\n926\t node.status = NodeStatus::Active;\n927\t topo.add_node(node);\n928\t }\n929\t topo\n930\t }\n931\t}\n932\t"}]},"parent_tool_use_id":"call_d8ab3450251e405481f12a94","session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","uuid":"8320e8fb-440c-4a5f-a578-040a2f07dbb7","timestamp":"2026-05-23T05:57:17.297Z"} -{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_5f6364a8aaa945ff8b3dd931","type":"tool_result","content":"1\t//! Rebalancer background worker with advisory lock.\n2\t//!\n3\t//! Implements plan §4 \"Rebalancer\" background task:\n4\t//! - Advisory lock via leader_lease (only one pod runs the rebalancer)\n5\t//! - Reacts to topology change events (node add/drain/fail/recover)\n6\t//! - Computes affected shards using the Phase 1 router\n7\t//! - Drives the migration state machine for each affected shard\n8\t//! - Updates Prometheus metrics (plan §10)\n9\t//! - Progress persistence via jobs table for resumability\n10\t\n11\tmod drift_reconciler;\n12\t\n13\t#[cfg(test)]\n14\tmod acceptance_tests;\n15\t\n16\t#[cfg(test)]\n17\tmod settings_broadcast_acceptance_tests;\n18\t\n19\tpub use drift_reconciler::{DriftReconciler, DriftReconcilerConfig};\n20\t\n21\tuse crate::migration::{MigrationCoordinator, MigrationId, MigrationNodeId, ShardId};\n22\tuse crate::rebalancer::{MigrationExecutor, Rebalancer, RebalancerMetrics};\n23\tuse crate::router::assign_shard_in_group;\n24\tuse crate::task_store::{NewJob, TaskStore};\n25\tuse crate::topology::{NodeId as TopologyNodeId, Topology};\n26\tuse serde::{Deserialize, Serialize};\n27\tuse std::collections::HashMap;\n28\tuse std::sync::Arc;\n29\tuse std::time::{Duration, Instant};\n30\tuse tokio::sync::{mpsc, RwLock};\n31\tuse tracing::{debug, error, info};\n32\t\n33\t/// Callback type for recording rebalancer metrics.\n34\t///\n35\t/// Called when:\n36\t/// - Documents are migrated (count)\n37\t/// - Rebalance starts (in_progress = true)\n38\t/// - Rebalance ends (in_progress = false, duration_secs)\n39\tpub type RebalancerMetricsCallback = Arc, Option) + Send + Sync>;\n40\t\n41\t/// Default leader lease TTL in seconds.\n42\tconst LEASE_TTL_SECS: u64 = 10;\n43\t\n44\t/// Default interval for lease renewal checks.\n45\tconst LEASE_RENEWAL_INTERVAL_MS: u64 = 2000;\n46\t\n47\t/// Maximum time to wait for a migration job to complete.\n48\tconst MIGRATION_TIMEOUT_SECS: u64 = 3600;\n49\t\n50\t/// Unique identifier for a rebalance job (per index).\n51\t#[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]\n52\tpub struct RebalanceJobId(pub String);\n53\t\n54\timpl RebalanceJobId {\n55\t /// Create a new rebalance job ID for an index.\n56\t pub fn new(index_uid: &str) -> Self {\n57\t Self(format!(\"rebalance:{}\", index_uid))\n58\t }\n59\t\n60\t /// Get the index UID from the job ID.\n61\t pub fn index_uid(&self) -> &str {\n62\t self.0.strip_prefix(\"rebalance:\").unwrap_or(&self.0)\n63\t }\n64\t}\n65\t\n66\t/// Topology change event that triggers rebalancing.\n67\t#[derive(Debug, Clone, Serialize, Deserialize)]\n68\tpub enum TopologyChangeEvent {\n69\t /// A new node was added to a replica group.\n70\t NodeAdded {\n71\t node_id: String,\n72\t replica_group: u32,\n73\t index_uid: String,\n74\t },\n75\t /// A node is being drained (preparing for removal).\n76\t NodeDraining {\n77\t node_id: String,\n78\t replica_group: u32,\n79\t index_uid: String,\n80\t },\n81\t /// A node failed and needs recovery.\n82\t NodeFailed {\n83\t node_id: String,\n84\t replica_group: u32,\n85\t index_uid: String,\n86\t },\n87\t /// A node recovered after failure.\n88\t NodeRecovered {\n89\t node_id: String,\n90\t replica_group: u32,\n91\t index_uid: String,\n92\t },\n93\t}\n94\t\n95\t/// Per-shard migration progress for persistence.\n96\t#[derive(Debug, Clone, Serialize, Deserialize)]\n97\tpub struct ShardMigrationProgress {\n98\t /// Shard ID.\n99\t pub shard_id: u32,\n100\t /// Current phase.\n101\t pub phase: String,\n102\t /// Documents migrated so far.\n103\t pub docs_migrated: u64,\n104\t /// Last offset for pagination resume.\n105\t pub last_offset: u32,\n106\t /// Source node for migration.\n107\t pub source_node: Option,\n108\t /// Target node for migration.\n109\t pub target_node: String,\n110\t}\n111\t\n112\t/// Per-shard migration state for the worker.\n113\t#[derive(Debug, Clone, Serialize, Deserialize)]\n114\tstruct ShardState {\n115\t /// Current phase.\n116\t phase: ShardMigrationPhase,\n117\t /// Documents migrated so far.\n118\t docs_migrated: u64,\n119\t /// Last offset for pagination resume.\n120\t last_offset: u32,\n121\t /// Source node for migration.\n122\t source_node: Option,\n123\t /// Target node for migration.\n124\t target_node: String,\n125\t /// When this shard migration started.\n126\t #[serde(skip, default = \"Instant::now\")]\n127\t started_at: Instant,\n128\t}\n129\t\n130\t/// Migration phases for a single shard.\n131\t#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]\n132\tpub enum ShardMigrationPhase {\n133\t /// Waiting to start.\n134\t Idle,\n135\t /// Dual-write active.\n136\t DualWriteStarted,\n137\t /// Background migration in progress.\n138\t MigrationInProgress,\n139\t /// Migration complete, preparing cutover.\n140\t MigrationComplete,\n141\t /// Dual-write stopped.\n142\t DualWriteStopped,\n143\t /// Old replica deleted.\n144\t OldReplicaDeleted,\n145\t /// Migration failed.\n146\t Failed,\n147\t}\n148\t\n149\t/// State machine for a rebalance job (per index).\n150\t#[derive(Debug, Clone, Serialize, Deserialize)]\n151\tstruct RebalanceJob {\n152\t /// Job ID.\n153\t id: RebalanceJobId,\n154\t /// Index UID being rebalanced.\n155\t index_uid: String,\n156\t /// Replica group being rebalanced.\n157\t replica_group: u32,\n158\t /// Per-shard migration state.\n159\t shards: HashMap,\n160\t /// Job started at.\n161\t #[serde(skip, default = \"Instant::now\")]\n162\t started_at: Instant,\n163\t /// Job completed at (if finished).\n164\t #[serde(skip, default)]\n165\t completed_at: Option,\n166\t /// Total documents migrated.\n167\t total_docs_migrated: u64,\n168\t /// Whether the job is paused.\n169\t paused: bool,\n170\t}\n171\t\n172\t/// Configuration for the rebalancer worker.\n173\t#[derive(Debug, Clone, Serialize, Deserialize)]\n174\tpub struct RebalancerWorkerConfig {\n175\t /// Maximum concurrent migrations (plan §14.2 memory budget).\n176\t pub max_concurrent_migrations: u32,\n177\t /// Leader lease TTL in seconds.\n178\t pub lease_ttl_secs: u64,\n179\t /// Lease renewal interval in milliseconds.\n180\t pub lease_renewal_interval_ms: u64,\n181\t /// Migration batch size.\n182\t pub migration_batch_size: u32,\n183\t /// Delay between migration batches (ms).\n184\t pub migration_batch_delay_ms: u64,\n185\t /// Channel capacity for topology events.\n186\t pub event_channel_capacity: usize,\n187\t}\n188\t\n189\timpl Default for RebalancerWorkerConfig {\n190\t fn default() -> Self {\n191\t Self {\n192\t max_concurrent_migrations: 4,\n193\t lease_ttl_secs: LEASE_TTL_SECS,\n194\t lease_renewal_interval_ms: LEASE_RENEWAL_INTERVAL_MS,\n195\t migration_batch_size: 1000,\n196\t migration_batch_delay_ms: 100,\n197\t event_channel_capacity: 100,\n198\t }\n199\t }\n200\t}\n201\t\n202\t/// The rebalancer background worker.\n203\t///\n204\t/// Runs as a Tokio task, acquires a leader lease, and processes topology\n205\t/// change events to drive shard migrations.\n206\tpub struct RebalancerWorker {\n207\t config: RebalancerWorkerConfig,\n208\t topology: Arc>,\n209\t task_store: Arc,\n210\t _rebalancer: Arc, // Reserved for future use\n211\t migration_coordinator: Arc>,\n212\t migration_executor: Option>,\n213\t metrics: Arc>,\n214\t pod_id: String,\n215\t /// Sender for topology change events.\n216\t event_tx: mpsc::Sender,\n217\t /// Active rebalance jobs (per index).\n218\t jobs: Arc>>,\n219\t /// Receiver for topology change events (cloned for internal use).\n220\t event_rx: Arc>>>,\n221\t /// Callback for recording Prometheus metrics.\n222\t metrics_callback: Option,\n223\t}\n224\t\n225\timpl RebalancerWorker {\n226\t /// Create a new rebalancer worker.\n227\t pub fn new(\n228\t config: RebalancerWorkerConfig,\n229\t topology: Arc>,\n230\t task_store: Arc,\n231\t rebalancer: Arc, // Reserved for future use\n232\t migration_coordinator: Arc>,\n233\t metrics: Arc>,\n234\t pod_id: String,\n235\t ) -> Self {\n236\t Self::with_metrics(config, topology, task_store, rebalancer, migration_coordinator, metrics, pod_id, None)\n237\t }\n238\t\n239\t /// Create a new rebalancer worker with metrics callback.\n240\t pub fn with_metrics(\n241\t config: RebalancerWorkerConfig,\n242\t topology: Arc>,\n243\t task_store: Arc,\n244\t rebalancer: Arc, // Reserved for future use\n245\t migration_coordinator: Arc>,\n246\t metrics: Arc>,\n247\t pod_id: String,\n248\t metrics_callback: Option,\n249\t ) -> Self {\n250\t let (event_tx, event_rx) = mpsc::channel(config.event_channel_capacity);\n251\t\n252\t Self {\n253\t config,\n254\t topology,\n255\t task_store,\n256\t _rebalancer: rebalancer, // Stored but not currently used\n257\t migration_coordinator,\n258\t migration_executor: None, // Set via with_migration_executor\n259\t metrics,\n260\t pod_id,\n261\t event_tx,\n262\t jobs: Arc::new(RwLock::new(HashMap::new())),\n263\t event_rx: Arc::new(RwLock::new(Some(event_rx))),\n264\t metrics_callback,\n265\t }\n266\t }\n267\t\n268\t /// Set the migration executor (provides HTTP client for actual migrations).\n269\t pub fn with_migration_executor(mut self, executor: Arc) -> Self {\n270\t self.migration_executor = Some(executor);\n271\t self\n272\t }\n273\t\n274\t /// Get a sender for topology change events.\n275\t pub fn event_sender(&self) -> mpsc::Sender {\n276\t self.event_tx.clone()\n277\t }\n278\t\n279\t /// Start the background worker.\n280\t ///\n281\t /// This runs in a loop:\n282\t /// 1. Try to acquire leader lease for each index (scope: rebalance:)\n283\t /// 2. If acquired, process events and run migrations\n284\t /// 3. Renew lease periodically\n285\t /// 4. If lease lost, go back to step 1\n286\t pub async fn run(&self) {\n287\t info!(\n288\t pod_id = %self.pod_id,\n289\t \"rebalancer worker starting\"\n290\t );\n291\t\n292\t loop {\n293\t // Try to acquire leader lease for each index we're managing\n294\t let mut leader_scopes = Vec::new();\n295\t\n296\t // Get all active indexes from current jobs and use default scope\n297\t let jobs = self.jobs.read().await;\n298\t let mut index_uids: Vec = jobs.values()\n299\t .map(|j| j.index_uid.clone())\n300\t .collect();\n301\t\n302\t // Always include \"default\" scope for rebalancer operations\n303\t index_uids.push(\"default\".to_string());\n304\t drop(jobs);\n305\t\n306\t // Build scopes for each index: rebalance:\n307\t let scopes: Vec = index_uids\n308\t .into_iter()\n309\t .map(|uid| format!(\"rebalance:{}\", uid))\n310\t .collect();\n311\t\n312\t let mut acquired_any = false;\n313\t for scope in &scopes {\n314\t let now_ms = now_ms();\n315\t let expires_at = now_ms + (self.config.lease_ttl_secs * 1000) as i64;\n316\t\n317\t match tokio::task::spawn_blocking({\n318\t let task_store = self.task_store.clone();\n319\t let scope = scope.clone();\n320\t let pod_id = self.pod_id.clone();\n321\t move || {\n322\t task_store.try_acquire_leader_lease(&scope, &pod_id, expires_at, now_ms)\n323\t }\n324\t })\n325\t .await\n326\t {\n327\t Ok(Ok(true)) => {\n328\t info!(scope = %scope, pod_id = %self.pod_id, \"acquired leader lease\");\n329\t leader_scopes.push(scope.clone());\n330\t acquired_any = true;\n331\t }\n332\t Ok(Ok(false)) => {\n333\t debug!(scope = %scope, \"leader lease already held\");\n334\t }\n335\t Ok(Err(e)) => {\n336\t error!(scope = %scope, error = %e, \"failed to acquire leader lease\");\n337\t }\n338\t Err(e) => {\n339\t error!(scope = %scope, error = %e, \"spawn_blocking task failed\");\n340\t }\n341\t }\n342\t }\n343\t\n344\t if acquired_any {\n345\t // We are the leader - update rebalancer metrics\n346\t {\n347\t let mut metrics = self.metrics.write().await;\n348\t metrics.start_rebalance();\n349\t }\n350\t\n351\t // Call metrics callback for rebalance start\n352\t if let Some(ref callback) = self.metrics_callback {\n353\t callback(true, None, None);\n354\t }\n355\t\n356\t // We are the leader - run the main loop\n357\t if let Err(e) = self.run_leader_loop(&leader_scopes).await {\n358\t error!(error = %e, \"leader loop failed\");\n359\t }\n360\t\n361\t // Clear rebalancer in-progress status on exit\n362\t {\n363\t let mut metrics = self.metrics.write().await;\n364\t metrics.end_rebalance();\n365\t }\n366\t\n367\t // Call metrics callback for rebalance end\n368\t if let Some(ref callback) = self.metrics_callback {\n369\t callback(false, None, None);\n370\t }\n371\t } else {\n372\t // Not the leader - wait before retrying\n373\t tokio::time::sleep(Duration::from_millis(\n374\t self.config.lease_renewal_interval_ms,\n375\t ))\n376\t .await;\n377\t }\n378\t }\n379\t }\n380\t\n381\t /// Run the leader loop: process events, renew lease, drive migrations.\n382\t async fn run_leader_loop(&self, scopes: &[String]) -> Result<(), String> {\n383\t let mut lease_renewal = tokio::time::interval(Duration::from_millis(\n384\t self.config.lease_renewal_interval_ms,\n385\t ));\n386\t\n387\t // Take the receiver out of the Option\n388\t let mut event_rx = {\n389\t let mut rx_guard = self.event_rx.write().await;\n390\t rx_guard.take().ok_or_else(|| \"event receiver already taken\".to_string())?\n391\t };\n392\t\n393\t let result = async {\n394\t loop {\n395\t tokio::select! {\n396\t // Renew lease periodically\n397\t _ = lease_renewal.tick() => {\n398\t for scope in scopes {\n399\t let now_ms = now_ms();\n400\t let expires_at = now_ms + (self.config.lease_ttl_secs * 1000) as i64;\n401\t\n402\t match tokio::task::spawn_blocking({\n403\t let task_store = self.task_store.clone();\n404\t let scope = scope.clone();\n405\t let pod_id = self.pod_id.clone();\n406\t move || {\n407\t task_store.renew_leader_lease(&scope, &pod_id, expires_at)\n408\t }\n409\t })\n410\t .await\n411\t {\n412\t Ok(Ok(true)) => {\n413\t debug!(scope = %scope, \"renewed leader lease\");\n414\t }\n415\t Ok(Ok(false)) => {\n416\t info!(scope = %scope, \"lost leader lease\");\n417\t return Ok::<(), String>(()); // Exit loop, will retry acquisition\n418\t }\n419\t Ok(Err(e)) => {\n420\t error!(scope = %scope, error = %e, \"failed to renew lease\");\n421\t return Err(format!(\"lease renewal failed: {}\", e));\n422\t }\n423\t Err(e) => {\n424\t error!(scope = %scope, error = %e, \"spawn_blocking task failed\");\n425\t return Err(format!(\"lease renewal task failed: {}\", e));\n426\t }\n427\t }\n428\t }\n429\t }\n430\t\n431\t // Process topology change events\n432\t Some(event) = event_rx.recv() => {\n433\t if let Err(e) = self.handle_topology_event(event).await {\n434\t error!(error = %e, \"failed to handle topology event\");\n435\t }\n436\t }\n437\t\n438\t // Drive active migrations\n439\t _ = tokio::time::sleep(Duration::from_millis(100)) => {\n440\t if let Err(e) = self.drive_migrations().await {\n441\t error!(error = %e, \"failed to drive migrations\");\n442\t }\n443\t }\n444\t }\n445\t }\n446\t }.await;\n447\t\n448\t // Put the receiver back for retry logic\n449\t {\n450\t let mut rx_guard = self.event_rx.write().await;\n451\t if rx_guard.is_none() {\n452\t *rx_guard = Some(event_rx);\n453\t }\n454\t }\n455\t\n456\t result\n457\t }\n458\t\n459\t /// Handle a topology change event.\n460\t async fn handle_topology_event(&self, event: TopologyChangeEvent) -> Result<(), String> {\n461\t info!(event = ?event, \"handling topology change event\");\n462\t\n463\t match event {\n464\t TopologyChangeEvent::NodeAdded {\n465\t node_id,\n466\t replica_group,\n467\t index_uid,\n468\t } => {\n469\t self.on_node_added(&node_id, replica_group, &index_uid)\n470\t .await?\n471\t }\n472\t TopologyChangeEvent::NodeDraining {\n473\t node_id,\n474\t replica_group,\n475\t index_uid,\n476\t } => {\n477\t self.on_node_draining(&node_id, replica_group, &index_uid)\n478\t .await?\n479\t }\n480\t TopologyChangeEvent::NodeFailed {\n481\t node_id,\n482\t replica_group,\n483\t index_uid,\n484\t } => {\n485\t self.on_node_failed(&node_id, replica_group, &index_uid)\n486\t .await?\n487\t }\n488\t TopologyChangeEvent::NodeRecovered {\n489\t node_id,\n490\t replica_group,\n491\t index_uid,\n492\t } => {\n493\t self.on_node_recovered(&node_id, replica_group, &index_uid)\n494\t .await?\n495\t }\n496\t }\n497\t\n498\t Ok(())\n499\t }\n500\t\n501\t /// Handle node addition: compute affected shards and create job to track migration.\n502\t async fn on_node_added(\n503\t &self,\n504\t node_id: &str,\n505\t replica_group: u32,\n506\t index_uid: &str,\n507\t ) -> Result<(), String> {\n508\t let job_id = RebalanceJobId::new(index_uid);\n509\t\n510\t // Check if we already have a job for this index\n511\t {\n512\t let jobs = self.jobs.read().await;\n513\t if jobs.contains_key(&job_id) {\n514\t debug!(index_uid = %index_uid, \"rebalance job already exists\");\n515\t return Ok(());\n516\t }\n517\t }\n518\t\n519\t // Compute affected shards using the Phase 1 router\n520\t let affected_shards = self.compute_affected_shards_for_add(node_id, replica_group).await?;\n521\t\n522\t if affected_shards.is_empty() {\n523\t info!(\n524\t node_id = %node_id,\n525\t replica_group = replica_group,\n526\t \"no shards need migration for node addition\"\n527\t );\n528\t return Ok(());\n529\t }\n530\t\n531\t info!(\n532\t node_id = %node_id,\n533\t replica_group = replica_group,\n534\t shard_count = affected_shards.len(),\n535\t \"computed affected shards for node addition\"\n536\t );\n537\t\n538\t // Build migration state: shard -> old owner mapping\n539\t let mut old_owners = HashMap::new();\n540\t let mut shard_states = HashMap::new();\n541\t for (shard_id, source_node) in &affected_shards {\n542\t old_owners.insert(ShardId(*shard_id), topo_to_migration_node_id(source_node));\n543\t shard_states.insert(\n544\t *shard_id,\n545\t ShardState {\n546\t phase: ShardMigrationPhase::Idle,\n547\t docs_migrated: 0,\n548\t last_offset: 0,\n549\t source_node: Some(source_node.to_string()),\n550\t target_node: node_id.to_string(),\n551\t started_at: Instant::now(),\n552\t },\n553\t );\n554\t }\n555\t\n556\t // Create migration in coordinator for state tracking and dual-write\n557\t let migration_id = {\n558\t let mut coordinator = self.migration_coordinator.write().await;\n559\t let new_node = topo_to_migration_node_id(&TopologyNodeId::new(node_id.to_string()));\n560\t coordinator.begin_migration(new_node, replica_group, old_owners)\n561\t .map_err(|e| format!(\"failed to create migration: {}\", e))?\n562\t };\n563\t\n564\t // Start dual-write immediately so the router starts writing to both nodes\n565\t {\n566\t let mut coordinator = self.migration_coordinator.write().await;\n567\t coordinator.begin_dual_write(migration_id)\n568\t .map_err(|e| format!(\"failed to start dual-write: {}\", e))?;\n569\t }\n570\t\n571\t let job = RebalanceJob {\n572\t id: job_id.clone(),\n573\t index_uid: index_uid.to_string(),\n574\t replica_group,\n575\t shards: shard_states,\n576\t started_at: Instant::now(),\n577\t completed_at: None,\n578\t total_docs_migrated: 0,\n579\t paused: false,\n580\t };\n581\t\n582\t // Persist job to task store\n583\t self.persist_job(&job).await?;\n584\t\n585\t // Store in memory\n586\t let mut jobs = self.jobs.write().await;\n587\t jobs.insert(job_id.clone(), job);\n588\t\n589\t info!(\n590\t migration_id = %migration_id,\n591\t shard_count = affected_shards.len(),\n592\t \"created migration for node addition\"\n593\t );\n594\t\n595\t Ok(())\n596\t }\n597\t\n598\t /// Handle node draining: compute destination shards and create job to track migration.\n599\t async fn on_node_draining(\n600\t &self,\n601\t node_id: &str,\n602\t replica_group: u32,\n603\t index_uid: &str,\n604\t ) -> Result<(), String> {\n605\t let job_id = RebalanceJobId::new(index_uid);\n606\t\n607\t // Compute shard destinations\n608\t let shard_destinations = self\n609\t .compute_shard_destinations_for_drain(node_id, replica_group)\n610\t .await?;\n611\t\n612\t if shard_destinations.is_empty() {\n613\t info!(\n614\t node_id = %node_id,\n615\t replica_group = replica_group,\n616\t \"no shards need migration for node drain\"\n617\t );\n618\t return Ok(());\n619\t }\n620\t\n621\t info!(\n622\t node_id = %node_id,\n623\t replica_group = replica_group,\n624\t shard_count = shard_destinations.len(),\n625\t \"computed shard destinations for node drain\"\n626\t );\n627\t\n628\t // Build migration state: shard -> old owner (draining node) mapping\n629\t let mut old_owners = HashMap::new();\n630\t let mut shard_states = HashMap::new();\n631\t for (shard_id, dest_node) in &shard_destinations {\n632\t old_owners.insert(ShardId(*shard_id), topo_to_migration_node_id(&TopologyNodeId::new(node_id.to_string())));\n633\t shard_states.insert(\n634\t *shard_id,\n635\t ShardState {\n636\t phase: ShardMigrationPhase::Idle,\n637\t docs_migrated: 0,\n638\t last_offset: 0,\n639\t source_node: Some(node_id.to_string()),\n640\t target_node: dest_node.to_string(),\n641\t started_at: Instant::now(),\n642\t },\n643\t );\n644\t }\n645\t\n646\t // Create migration in coordinator for state tracking and dual-write\n647\t let migration_id = {\n648\t let mut coordinator = self.migration_coordinator.write().await;\n649\t // For drain, the destination node becomes the \"new\" node in the migration\n650\t if let Some((_, first_dest)) = shard_destinations.first() {\n651\t let new_node = topo_to_migration_node_id(first_dest);\n652\t coordinator.begin_migration(new_node, replica_group, old_owners)\n653\t .map_err(|e| format!(\"failed to create migration: {}\", e))?\n654\t } else {\n655\t return Err(\"no shards to migrate\".to_string());\n656\t }\n657\t };\n658\t\n659\t // Start dual-write immediately\n660\t {\n661\t let mut coordinator = self.migration_coordinator.write().await;\n662\t coordinator.begin_dual_write(migration_id)\n663\t .map_err(|e| format!(\"failed to start dual-write: {}\", e))?;\n664\t }\n665\t\n666\t let job = RebalanceJob {\n667\t id: job_id.clone(),\n668\t index_uid: index_uid.to_string(),\n669\t replica_group,\n670\t shards: shard_states,\n671\t started_at: Instant::now(),\n672\t completed_at: None,\n673\t total_docs_migrated: 0,\n674\t paused: false,\n675\t };\n676\t\n677\t // Persist job to task store\n678\t self.persist_job(&job).await?;\n679\t\n680\t // Store in memory\n681\t let mut jobs = self.jobs.write().await;\n682\t jobs.insert(job_id.clone(), job);\n683\t\n684\t info!(\n685\t migration_id = %migration_id,\n686\t shard_count = shard_destinations.len(),\n687\t \"created migration for node drain\"\n688\t );\n689\t\n690\t Ok(())\n691\t }\n692\t\n693\t /// Handle node failure.\n694\t async fn on_node_failed(\n695\t &self,\n696\t node_id: &str,\n697\t replica_group: u32,\n698\t index_uid: &str,\n699\t ) -> Result<(), String> {\n700\t info!(\n701\t node_id = %node_id,\n702\t replica_group = replica_group,\n703\t index_uid = %index_uid,\n704\t \"handling node failure\"\n705\t );\n706\t\n707\t // Mark node as failed in topology\n708\t let node_id_obj = TopologyNodeId::new(node_id.to_string());\n709\t {\n710\t let mut topo = self.topology.write().await;\n711\t if let Some(node) = topo.node_mut(&node_id_obj) {\n712\t node.status = crate::topology::NodeStatus::Failed;\n713\t }\n714\t }\n715\t\n716\t // TODO: Schedule replication to restore RF if needed\n717\t // For now, just log the failure\n718\t Ok(())\n719\t }\n720\t\n721\t /// Handle node recovery.\n722\t async fn on_node_recovered(\n723\t &self,\n724\t node_id: &str,\n725\t replica_group: u32,\n726\t index_uid: &str,\n727\t ) -> Result<(), String> {\n728\t info!(\n729\t node_id = %node_id,\n730\t replica_group = replica_group,\n731\t index_uid = %index_uid,\n732\t \"handling node recovery\"\n733\t );\n734\t\n735\t // Mark node as active in topology\n736\t let node_id_obj = TopologyNodeId::new(node_id.to_string());\n737\t {\n738\t let mut topo = self.topology.write().await;\n739\t if let Some(node) = topo.node_mut(&node_id_obj) {\n740\t node.status = crate::topology::NodeStatus::Active;\n741\t }\n742\t }\n743\t\n744\t // TODO: If auto_rebalance_on_recovery is enabled, trigger rebalancing\n745\t\n746\t Ok(())\n747\t }\n748\t\n749\t /// Compute which shards are affected by adding a new node.\n750\t /// Returns shard -> source_node mapping for shards that will move.\n751\t async fn compute_affected_shards_for_add(\n752\t &self,\n753\t new_node_id: &str,\n754\t replica_group: u32,\n755\t ) -> Result, String> {\n756\t let topo = self.topology.read().await;\n757\t let new_node_id = TopologyNodeId::new(new_node_id.to_string());\n758\t let rf = topo.rf();\n759\t\n760\t // Find the target group\n761\t let group = topo\n762\t .groups()\n763\t .find(|g| g.id == replica_group)\n764\t .ok_or_else(|| format!(\"replica group {} not found\", replica_group))?;\n765\t\n766\t let existing_nodes: Vec<_> = group.nodes().iter().cloned().collect();\n767\t let mut affected_shards = Vec::new();\n768\t\n769\t // For each shard, check if adding the new node would change the assignment\n770\t for shard_id in 0..topo.shards {\n771\t let old_assignment: Vec<_> =\n772\t assign_shard_in_group(shard_id, &existing_nodes, rf);\n773\t\n774\t // New assignment with the new node included\n775\t let all_nodes: Vec<_> = existing_nodes\n776\t .iter()\n777\t .cloned()\n778\t .chain(std::iter::once(new_node_id.clone()))\n779\t .collect();\n780\t let new_assignment: Vec<_> = assign_shard_in_group(shard_id, &all_nodes, rf);\n781\t\n782\t // Check if the new node is in the new assignment\n783\t if new_assignment.contains(&new_node_id) {\n784\t // This shard moves to the new node\n785\t if let Some(old_owner) = old_assignment.first() {\n786\t affected_shards.push((shard_id, old_owner.clone()));\n787\t }\n788\t }\n789\t }\n790\t\n791\t Ok(affected_shards)\n792\t }\n793\t\n794\t /// Compute where each shard should go when draining a node.\n795\t /// Returns shard -> destination_node mapping.\n796\t async fn compute_shard_destinations_for_drain(\n797\t &self,\n798\t drain_node_id: &str,\n799\t replica_group: u32,\n800\t ) -> Result, String> {\n801\t let topo = self.topology.read().await;\n802\t let drain_node_id = TopologyNodeId::new(drain_node_id.to_string());\n803\t let rf = topo.rf();\n804\t\n805\t // Find the target group\n806\t let group = topo\n807\t .groups()\n808\t .find(|g| g.id == replica_group)\n809\t .ok_or_else(|| format!(\"replica group {} not found\", replica_group))?;\n810\t\n811\t let other_nodes: Vec<_> = group\n812\t .nodes()\n813\t .iter()\n814\t .filter(|n| **n != drain_node_id)\n815\t .cloned()\n816\t .collect();\n817\t\n818\t if other_nodes.is_empty() {\n819\t return Err(\"cannot remove last node in group\".to_string());\n820\t }\n821\t\n822\t let mut destinations = Vec::new();\n823\t\n824\t // For each shard, find a new owner among the remaining nodes\n825\t for shard_id in 0..topo.shards {\n826\t let assignment: Vec<_> = assign_shard_in_group(shard_id, group.nodes(), rf);\n827\t\n828\t if assignment.contains(&drain_node_id) {\n829\t // This shard needs a new home\n830\t let mut best_node = None;\n831\t let mut best_score = 0u64;\n832\t\n833\t for node in &other_nodes {\n834\t let s = crate::router::score(shard_id, node.as_str());\n835\t if s > best_score {\n836\t best_score = s;\n837\t best_node = Some(node.clone());\n838\t }\n839\t }\n840\t\n841\t if let Some(dest) = best_node {\n842\t destinations.push((shard_id, dest));\n843\t }\n844\t }\n845\t }\n846\t\n847\t Ok(destinations)\n848\t }\n849\t\n850\t /// Drive active migrations forward.\n851\t async fn drive_migrations(&self) -> Result<(), String> {\n852\t let jobs = self.jobs.read().await;\n853\t let mut active_jobs = Vec::new();\n854\t\n855\t for (job_id, job) in jobs.iter() {\n856\t if job.paused || job.completed_at.is_some() {\n857\t continue;\n858\t }\n859\t\n860\t // Count how many shards are actively migrating\n861\t let migrating_count = job\n862\t .shards\n863\t .values()\n864\t .filter(|s| {\n865\t matches!(\n866\t s.phase,\n867\t ShardMigrationPhase::MigrationInProgress\n868\t | ShardMigrationPhase::DualWriteStarted\n869\t )\n870\t })\n871\t .count();\n872\t\n873\t if migrating_count < self.config.max_concurrent_migrations as usize {\n874\t active_jobs.push((job_id.clone(), job.clone()));\n875\t }\n876\t }\n877\t\n878\t // Drop read lock before processing\n879\t drop(jobs);\n880\t\n881\t // Process up to max_concurrent_migrations jobs\n882\t for (job_id, job) in active_jobs\n883\t .into_iter()\n884\t .take(self.config.max_concurrent_migrations as usize)\n885\t {\n886\t if let Err(e) = self.process_job(&job_id).await {\n887\t error!(job_id = %job_id.0, error = %e, \"failed to process job\");\n888\t }\n889\t }\n890\t\n891\t Ok(())\n892\t }\n893\t\n894\t /// Emit Prometheus metrics for the current rebalancer state.\n895\t pub async fn emit_metrics(&self) {\n896\t let jobs = self.jobs.read().await;\n897\t\n898\t // Calculate total documents migrated across all jobs\n899\t let total_docs: u64 = jobs.values()\n900\t .map(|j| j.total_docs_migrated)\n901\t .sum();\n902\t\n903\t // Check if any rebalance is in progress\n904\t let in_progress = jobs.values().any(|j| j.completed_at.is_none() && !j.paused);\n905\t\n906\t drop(jobs);\n907\t\n908\t // Update internal metrics\n909\t {\n910\t let mut metrics = self.metrics.write().await;\n911\t if in_progress {\n912\t metrics.start_rebalance();\n913\t } else {\n914\t metrics.end_rebalance();\n915\t }\n916\t // Note: documents_migrated_total is already tracked in RebalancerMetrics\n917\t // and synced to Prometheus via the health checker\n918\t let _ = total_docs;\n919\t }\n920\t\n921\t // Call metrics callback for rebalance status\n922\t if let Some(ref callback) = self.metrics_callback {\n923\t callback(in_progress, None, None);\n924\t }\n925\t }\n926\t\n927\t /// Get the current rebalancer status for monitoring.\n928\t pub async fn get_status(&self) -> RebalancerWorkerStatus {\n929\t let jobs = self.jobs.read().await;\n930\t\n931\t let active_jobs = jobs.values()\n932\t .filter(|j| j.completed_at.is_none() && !j.paused)\n933\t .count();\n934\t\n935\t let completed_jobs = jobs.values()\n936\t .filter(|j| j.completed_at.is_some())\n937\t .count();\n938\t\n939\t let paused_jobs = jobs.values()\n940\t .filter(|j| j.paused)\n941\t .count();\n942\t\n943\t let total_shards: usize = jobs.values()\n944\t .map(|j| j.shards.len())\n945\t .sum();\n946\t\n947\t let completed_shards: usize = jobs.values()\n948\t .map(|j| j.shards.values().filter(|s| s.phase == ShardMigrationPhase::OldReplicaDeleted).count())\n949\t .sum();\n950\t\n951\t RebalancerWorkerStatus {\n952\t active_jobs,\n953\t completed_jobs,\n954\t paused_jobs,\n955\t total_shards,\n956\t completed_shards,\n957\t }\n958\t }\n959\t\n960\t /// Process a single rebalance job.\n961\t ///\n962\t /// Drives the migration state machine forward for each shard in the job.\n963\t /// This is the core method that advances migrations through their phases.\n964\t async fn process_job(&self, job_id: &RebalanceJobId) -> Result<(), String> {\n965\t // Get job (cloned to avoid holding lock)\n966\t let job = {\n967\t let jobs = self.jobs.read().await;\n968\t jobs.get(job_id).cloned()\n969\t };\n970\t\n971\t let mut job = match job {\n972\t Some(j) => j,\n973\t None => return Ok(()), // Job may have been removed\n974\t };\n975\t\n976\t // Skip paused or completed jobs\n977\t if job.paused || job.completed_at.is_some() {\n978\t return Ok(());\n979\t }\n980\t\n981\t // Sync worker job state with MigrationCoordinator state\n982\t // This ensures we resume from the correct phase after a pod restart\n983\t self.sync_job_with_coordinator(&mut job).await?;\n984\t\n985\t // Get the migration from the coordinator for this job\n986\t let migration_id = {\n987\t let coordinator = self.migration_coordinator.read().await;\n988\t let mut found_id = None;\n989\t for (mid, state) in coordinator.get_all_migrations() {\n990\t // Match by index_uid and replica_group\n991\t if state.replica_group == job.replica_group {\n992\t found_id = Some(*mid);\n993\t break;\n994\t }\n995\t }\n996\t found_id.ok_or_else(|| \"no migration found for this job\".to_string())?\n997\t };\n998\t\n999\t // Get migration state to access node addresses\n1000\t let (new_node, old_owners) = {\n1001\t let coordinator = self.migration_coordinator.read().await;\n1002\t let state = coordinator.get_state(migration_id)\n1003\t .ok_or_else(|| \"migration state not found\".to_string())?;\n1004\t (state.new_node.clone(), state.old_owners.clone())\n1005\t };\n1006\t\n1007\t // Get node addresses from topology\n1008\t let (new_node_address, old_owner_addresses) = {\n1009\t let topo = self.topology.read().await;\n1010\t let new_addr = topo.node(&migration_to_topo_node_id(&new_node))\n1011\t .ok_or_else(|| format!(\"new node not found: {}\", new_node.0))?\n1012\t .address.clone();\n1013\t\n1014\t let mut old_addrs = HashMap::new();\n1015\t for (shard, old_node) in &old_owners {\n1016\t if let Some(node) = topo.node(&migration_to_topo_node_id(old_node)) {\n1017\t old_addrs.insert(*shard, node.address.clone());\n1018\t }\n1019\t }\n1020\t\n1021\t (new_addr, old_addrs)\n1022\t };\n1023\t\n1024\t // Use a default index for now - in production, this would come from config\n1025\t let index_uid = \"default\".to_string();\n1026\t\n1027\t // Drive migrations forward for each shard\n1028\t let mut updated = false;\n1029\t let mut total_docs_migrated = 0u64;\n1030\t\n1031\t // Limit concurrent migrations to stay within memory budget\n1032\t let mut active_count = 0;\n1033\t\n1034\t for (&shard_id, shard_state) in job.shards.iter_mut() {\n1035\t // Check concurrent migration limit\n1036\t if active_count >= self.config.max_concurrent_migrations as usize {\n1037\t break;\n1038\t }\n1039\t\n1040\t match shard_state.phase {\n1041\t ShardMigrationPhase::Idle => {\n1042\t // Already started dual-write in on_node_added/on_node_draining\n1043\t shard_state.phase = ShardMigrationPhase::DualWriteStarted;\n1044\t updated = true;\n1045\t }\n1046\t ShardMigrationPhase::DualWriteStarted => {\n1047\t // Start background migration\n1048\t if let Some(ref executor) = self.migration_executor {\n1049\t if let Some(old_address) = old_owner_addresses.get(&ShardId(shard_id)) {\n1050\t let old_node = old_owners.get(&ShardId(shard_id))\n1051\t .cloned()\n1052\t .unwrap_or_else(|| crate::migration::NodeId(\"unknown\".to_string()));\n1053\t if let Err(e) = self.execute_background_migration(\n1054\t executor,\n1055\t migration_id,\n1056\t shard_id,\n1057\t &old_node,\n1058\t old_address,\n1059\t &new_node.0,\n1060\t &new_node_address,\n1061\t &index_uid,\n1062\t ).await {\n1063\t error!(shard_id, error = %e, \"failed to execute background migration\");\n1064\t shard_state.phase = ShardMigrationPhase::Failed;\n1065\t } else {\n1066\t shard_state.phase = ShardMigrationPhase::MigrationInProgress;\n1067\t active_count += 1;\n1068\t updated = true;\n1069\t }\n1070\t }\n1071\t } else {\n1072\t // No executor - skip directly to complete for testing\n1073\t shard_state.docs_migrated = 1000; // Simulated\n1074\t shard_state.phase = ShardMigrationPhase::MigrationComplete;\n1075\t updated = true;\n1076\t }\n1077\t }\n1078\t ShardMigrationPhase::MigrationInProgress => {\n1079\t // Check if migration is complete by querying the coordinator\n1080\t let complete = self.check_migration_complete_for_shard(shard_id).await?;\n1081\t if complete {\n1082\t shard_state.phase = ShardMigrationPhase::MigrationComplete;\n1083\t active_count -= 1; // One less active migration\n1084\t updated = true;\n1085\t }\n1086\t }\n1087\t ShardMigrationPhase::MigrationComplete => {\n1088\t // Begin cutover sequence\n1089\t if let Err(e) = self.begin_cutover_for_shard(shard_id).await {\n1090\t error!(shard_id, error = %e, \"failed to begin cutover\");\n1091\t } else {\n1092\t shard_state.phase = ShardMigrationPhase::DualWriteStopped;\n1093\t updated = true;\n1094\t }\n1095\t }\n1096\t ShardMigrationPhase::DualWriteStopped => {\n1097\t // Complete cutover and delete old replica\n1098\t if let Err(e) = self.complete_cutover_for_shard(shard_id).await {\n1099\t error!(shard_id, error = %e, \"failed to complete cutover\");\n1100\t } else {\n1101\t shard_state.phase = ShardMigrationPhase::OldReplicaDeleted;\n1102\t updated = true;\n1103\t }\n1104\t }\n1105\t ShardMigrationPhase::OldReplicaDeleted => {\n1106\t // Migration complete for this shard\n1107\t }\n1108\t ShardMigrationPhase::Failed => {\n1109\t // Migration failed - skip this shard\n1110\t }\n1111\t }\n1112\t\n1113\t total_docs_migrated += shard_state.docs_migrated;\n1114\t }\n1115\t\n1116\t // Update total docs migrated for the job\n1117\t job.total_docs_migrated = total_docs_migrated;\n1118\t\n1119\t // Update metrics\n1120\t {\n1121\t let mut metrics = self.metrics.write().await;\n1122\t metrics.record_documents_migrated(total_docs_migrated);\n1123\t }\n1124\t\n1125\t // Call metrics callback for documents migrated\n1126\t if let Some(ref callback) = self.metrics_callback {\n1127\t callback(false, Some(total_docs_migrated), None);\n1128\t }\n1129\t\n1130\t // Check if job is complete (all shards in final state)\n1131\t let all_complete = job.shards.values().all(|s| {\n1132\t matches!(s.phase, ShardMigrationPhase::OldReplicaDeleted | ShardMigrationPhase::Failed)\n1133\t });\n1134\t\n1135\t if all_complete && job.completed_at.is_none() {\n1136\t job.completed_at = Some(Instant::now());\n1137\t\n1138\t // Record final duration metric\n1139\t let duration = job.started_at.elapsed().as_secs_f64();\n1140\t {\n1141\t let mut metrics = self.metrics.write().await;\n1142\t metrics.end_rebalance();\n1143\t info!(\n1144\t job_id = %job_id.0,\n1145\t duration_secs = duration,\n1146\t \"rebalance job completed\"\n1147\t );\n1148\t }\n1149\t\n1150\t // Call metrics callback for rebalance completion with duration\n1151\t if let Some(ref callback) = self.metrics_callback {\n1152\t callback(false, None, Some(duration));\n1153\t }\n1154\t\n1155\t // Update job in memory\n1156\t let mut jobs = self.jobs.write().await;\n1157\t jobs.insert(job_id.clone(), job.clone());\n1158\t\n1159\t // Persist to task store\n1160\t self.persist_job(&job).await?;\n1161\t\n1162\t // Persist progress for each shard\n1163\t for shard_id in job.shards.keys() {\n1164\t self.persist_job_progress(&job, *shard_id).await?;\n1165\t }\n1166\t }\n1167\t\n1168\t Ok(())\n1169\t }\n1170\t\n1171\t /// Persist a job to the task store.\n1172\t async fn persist_job(&self, job: &RebalanceJob) -> Result<(), String> {\n1173\t let progress = serde_json::to_string(job)\n1174\t .map_err(|e| format!(\"failed to serialize job: {}\", e))?;\n1175\t\n1176\t let new_job = NewJob {\n1177\t id: job.id.0.clone(),\n1178\t type_: \"rebalance\".to_string(),\n1179\t params: progress,\n1180\t state: if job.completed_at.is_some() {\n1181\t \"completed\".to_string()\n1182\t } else if job.paused {\n1183\t \"paused\".to_string()\n1184\t } else {\n1185\t \"running\".to_string()\n1186\t },\n1187\t progress: format!(\n1188\t \"{{\\\"total_shards\\\":{},\\\"completed\\\":{},\\\"docs_migrated\\\":{}}}\",\n1189\t job.shards.len(),\n1190\t job.shards\n1191\t .values()\n1192\t .filter(|s| s.phase == ShardMigrationPhase::OldReplicaDeleted)\n1193\t .count(),\n1194\t job.total_docs_migrated\n1195\t ),\n1196\t };\n1197\t\n1198\t tokio::task::spawn_blocking({\n1199\t let task_store = self.task_store.clone();\n1200\t let new_job = new_job.clone();\n1201\t move || {\n1202\t task_store.insert_job(&new_job)\n1203\t }\n1204\t })\n1205\t .await\n1206\t .map_err(|e| format!(\"failed to persist job: {}\", e))?\n1207\t .map_err(|e| format!(\"failed to persist job: {}\", e))?;\n1208\t\n1209\t Ok(())\n1210\t }\n1211\t\n1212\t /// Persist progress for a single shard.\n1213\t async fn persist_job_progress(\n1214\t &self,\n1215\t job: &RebalanceJob,\n1216\t shard_id: u32,\n1217\t ) -> Result<(), String> {\n1218\t if let Some(shard_state) = job.shards.get(&shard_id) {\n1219\t let progress = ShardMigrationProgress {\n1220\t shard_id,\n1221\t phase: format!(\"{:?}\", shard_state.phase),\n1222\t docs_migrated: shard_state.docs_migrated,\n1223\t last_offset: shard_state.last_offset,\n1224\t source_node: shard_state.source_node.clone(),\n1225\t target_node: shard_state.target_node.clone(),\n1226\t };\n1227\t\n1228\t let progress_json =\n1229\t serde_json::to_string(&progress)\n1230\t .map_err(|e| format!(\"failed to serialize progress: {}\", e))?;\n1231\t\n1232\t // Update job progress in task store\n1233\t tokio::task::spawn_blocking({\n1234\t let task_store = self.task_store.clone();\n1235\t let job_id = job.id.0.clone();\n1236\t let completed_at = format!(\"{:?}\", job.completed_at.is_some());\n1237\t let progress_json = progress_json.clone();\n1238\t move || {\n1239\t task_store.update_job_progress(&job_id, &completed_at, &progress_json)\n1240\t }\n1241\t })\n1242\t .await\n1243\t .map_err(|e| format!(\"failed to update job progress: {}\", e))?\n1244\t .map_err(|e| format!(\"failed to update job progress: {}\", e))?;\n1245\t }\n1246\t\n1247\t Ok(())\n1248\t }\n1249\t\n1250\t /// Sync worker job state with MigrationCoordinator state.\n1251\t ///\n1252\t /// This ensures that after a pod restart, the worker's job state reflects\n1253\t /// the actual migration state tracked by the coordinator.\n1254\t async fn sync_job_with_coordinator(&self, job: &mut RebalanceJob) -> Result<(), String> {\n1255\t let coordinator = self.migration_coordinator.read().await;\n1256\t\n1257\t // For each shard in the job, check if there's a corresponding migration\n1258\t // in the coordinator and sync the state\n1259\t for (&shard_id, shard_state) in job.shards.iter_mut() {\n1260\t let shard = ShardId(shard_id);\n1261\t\n1262\t // Look for a migration in the coordinator that affects this shard\n1263\t for (_mid, migration_state) in coordinator.get_all_migrations() {\n1264\t if let Some(migration_shard_state) = migration_state.affected_shards.get(&shard) {\n1265\t // Sync the phase based on the migration coordinator state\n1266\t use crate::migration::ShardMigrationState as CoordinatorState;\n1267\t shard_state.phase = match migration_shard_state {\n1268\t CoordinatorState::Pending => ShardMigrationPhase::Idle,\n1269\t CoordinatorState::Migrating { .. } => ShardMigrationPhase::MigrationInProgress,\n1270\t CoordinatorState::MigrationComplete { docs_copied } => {\n1271\t shard_state.docs_migrated = *docs_copied;\n1272\t ShardMigrationPhase::MigrationComplete\n1273\t }\n1274\t CoordinatorState::Draining { .. } => ShardMigrationPhase::DualWriteStopped,\n1275\t CoordinatorState::DeltaPass { docs_copied, delta_docs_copied } => {\n1276\t shard_state.docs_migrated = docs_copied + delta_docs_copied;\n1277\t ShardMigrationPhase::DualWriteStopped\n1278\t }\n1279\t CoordinatorState::Active => ShardMigrationPhase::OldReplicaDeleted,\n1280\t CoordinatorState::Failed { .. } => ShardMigrationPhase::Failed,\n1281\t };\n1282\t }\n1283\t }\n1284\t }\n1285\t\n1286\t Ok(())\n1287\t }\n1288\t\n1289\t /// Start dual-write phase for a shard.\n1290\t async fn start_dual_write_for_shard(&self, _replica_group: u32, shard_id: u32) -> Result<(), String> {\n1291\t let shard = ShardId(shard_id);\n1292\t let mut coordinator = self.migration_coordinator.write().await;\n1293\t\n1294\t // Find or create the migration for this shard\n1295\t // For now, we'll create a new migration if one doesn't exist\n1296\t // In production, this would be created when the job is created\n1297\t\n1298\t info!(\n1299\t shard_id,\n1300\t \"starting dual-write phase\"\n1301\t );\n1302\t\n1303\t // The dual-write is handled by the router checking is_dual_write_active\n1304\t // We just need to ensure the migration coordinator knows about this shard\n1305\t Ok(())\n1306\t }\n1307\t\n1308\t /// Begin cutover sequence for a shard.\n1309\t async fn begin_cutover_for_shard(&self, shard_id: u32) -> Result<(), String> {\n1310\t info!(\n1311\t shard_id,\n1312\t \"beginning cutover sequence\"\n1313\t );\n1314\t\n1315\t let shard = ShardId(shard_id);\n1316\t let mut coordinator = self.migration_coordinator.write().await;\n1317\t\n1318\t // Collect the migrations that affect this shard first\n1319\t let migrations_to_cutover: Vec<_> = coordinator.get_all_migrations()\n1320\t .iter()\n1321\t .filter(|(_, migration_state)| migration_state.affected_shards.contains_key(&shard))\n1322\t .map(|(mid, _)| *mid)\n1323\t .collect();\n1324\t\n1325\t // Now perform the cutover\n1326\t for mid in migrations_to_cutover {\n1327\t coordinator.begin_cutover(mid).map_err(|e| e.to_string())?;\n1328\t break; // Only need to cutover one migration per shard\n1329\t }\n1330\t\n1331\t Ok(())\n1332\t }\n1333\t\n1334\t /// Complete cutover and delete old replica for a shard.\n1335\t async fn complete_cutover_for_shard(&self, shard_id: u32) -> Result<(), String> {\n1336\t info!(\n1337\t shard_id,\n1338\t \"completing cutover and deleting old replica\"\n1339\t );\n1340\t\n1341\t let shard = ShardId(shard_id);\n1342\t let mut coordinator = self.migration_coordinator.write().await;\n1343\t\n1344\t // Collect the migrations that affect this shard first\n1345\t let migrations_to_complete: Vec<_> = coordinator.get_all_migrations()\n1346\t .iter()\n1347\t .filter(|(_, migration_state)| migration_state.affected_shards.contains_key(&shard))\n1348\t .map(|(mid, _)| *mid)\n1349\t .collect();\n1350\t\n1351\t // Now complete the cleanup\n1352\t for mid in migrations_to_complete {\n1353\t coordinator.complete_drain(mid).map_err(|e| e.to_string())?;\n1354\t coordinator.complete_cleanup(mid).map_err(|e| e.to_string())?;\n1355\t break; // Only need to complete one migration per shard\n1356\t }\n1357\t\n1358\t Ok(())\n1359\t }\n1360\t\n1361\t /// Start background migration for a shard.\n1362\t async fn start_background_migration_for_shard(&self, shard_id: u32) -> Result<(), String> {\n1363\t info!(\n1364\t shard_id,\n1365\t \"starting background migration\"\n1366\t );\n1367\t\n1368\t // The actual migration is handled by the Rebalancer component's migration executor\n1369\t // This method just signals that we're ready for background migration to proceed\n1370\t Ok(())\n1371\t }\n1372\t\n1373\t /// Check if migration is complete for a shard.\n1374\t async fn check_migration_complete_for_shard(&self, shard_id: u32) -> Result {\n1375\t let shard = ShardId(shard_id);\n1376\t let coordinator = self.migration_coordinator.read().await;\n1377\t\n1378\t // Check if the migration coordinator has marked this shard as complete\n1379\t for (_mid, migration_state) in coordinator.get_all_migrations() {\n1380\t if let Some(shard_state) = migration_state.affected_shards.get(&shard) {\n1381\t use crate::migration::ShardMigrationState as CoordinatorState;\n1382\t if matches!(shard_state, CoordinatorState::MigrationComplete { .. }) {\n1383\t return Ok(true);\n1384\t }\n1385\t }\n1386\t }\n1387\t\n1388\t Ok(false)\n1389\t }\n1390\t\n1391\t /// Execute background migration for a shard.\n1392\t ///\n1393\t /// This performs the actual document migration from source to target node\n1394\t /// using pagination to stay within memory bounds.\n1395\t async fn execute_background_migration(\n1396\t &self,\n1397\t executor: &Arc,\n1398\t migration_id: MigrationId,\n1399\t shard_id: u32,\n1400\t old_node_id: &MigrationNodeId,\n1401\t old_address: &str,\n1402\t new_node_id: &str,\n1403\t new_address: &str,\n1404\t index_uid: &str,\n1405\t ) -> Result<(), String> {\n1406\t info!(\n1407\t migration_id = %migration_id,\n1408\t shard_id,\n1409\t from = %old_node_id.0,\n1410\t to = %new_node_id,\n1411\t \"starting shard migration\"\n1412\t );\n1413\t\n1414\t // Paginate through all documents for this shard\n1415\t let mut offset = 0u32;\n1416\t let limit = self.config.migration_batch_size;\n1417\t let mut total_docs_copied = 0u64;\n1418\t\n1419\t loop {\n1420\t // Fetch documents from source\n1421\t let (docs, _total) = executor.fetch_documents(\n1422\t &old_node_id.0,\n1423\t old_address,\n1424\t index_uid,\n1425\t shard_id,\n1426\t limit,\n1427\t offset,\n1428\t ).await.map_err(|e| format!(\"fetch failed: {}\", e))?;\n1429\t\n1430\t if docs.is_empty() {\n1431\t break; // No more documents\n1432\t }\n1433\t\n1434\t // Write documents to target\n1435\t executor.write_documents(\n1436\t new_node_id,\n1437\t new_address,\n1438\t index_uid,\n1439\t docs.clone(),\n1440\t ).await.map_err(|e| format!(\"write failed: {}\", e))?;\n1441\t\n1442\t total_docs_copied += docs.len() as u64;\n1443\t offset += limit;\n1444\t\n1445\t // Throttle if configured\n1446\t if self.config.migration_batch_delay_ms > 0 {\n1447\t tokio::time::sleep(Duration::from_millis(\n1448\t self.config.migration_batch_delay_ms,\n1449\t ))\n1450\t .await;\n1451\t }\n1452\t }\n1453\t\n1454\t // Mark shard migration complete in coordinator\n1455\t {\n1456\t let mut coordinator = self.migration_coordinator.write().await;\n1457\t coordinator.shard_migration_complete(migration_id, ShardId(shard_id), total_docs_copied)\n1458\t .map_err(|e| format!(\"failed to mark shard complete: {}\", e))?;\n1459\t }\n1460\t\n1461\t // Update metrics\n1462\t {\n1463\t let mut metrics = self.metrics.write().await;\n1464\t metrics.record_documents_migrated(total_docs_copied);\n1465\t }\n1466\t\n1467\t // Call metrics callback for documents migrated\n1468\t if let Some(ref callback) = self.metrics_callback {\n1469\t callback(false, Some(total_docs_copied), None);\n1470\t }\n1471\t\n1472\t info!(\n1473\t migration_id = %migration_id,\n1474\t shard_id,\n1475\t docs_copied = total_docs_copied,\n1476\t \"shard migration complete\"\n1477\t );\n1478\t\n1479\t Ok(())\n1480\t }\n1481\t\n1482\t /// Pause an in-progress rebalance.\n1483\t\n1484\t /// Pause an in-progress rebalance.\n1485\t pub async fn pause_rebalance(&self, index_uid: &str) -> Result<(), String> {\n1486\t let job_id = RebalanceJobId::new(index_uid);\n1487\t let mut jobs = self.jobs.write().await;\n1488\t\n1489\t if let Some(job) = jobs.get_mut(&job_id) {\n1490\t job.paused = true;\n1491\t info!(index_uid = %index_uid, \"paused rebalance\");\n1492\t Ok(())\n1493\t } else {\n1494\t Err(format!(\"no rebalance job found for index {}\", index_uid))\n1495\t }\n1496\t }\n1497\t\n1498\t /// Resume a paused rebalance.\n1499\t pub async fn resume_rebalance(&self, index_uid: &str) -> Result<(), String> {\n1500\t let job_id = RebalanceJobId::new(index_uid);\n1501\t let mut jobs = self.jobs.write().await;\n1502\t\n1503\t if let Some(job) = jobs.get_mut(&job_id) {\n1504\t job.paused = false;\n1505\t info!(index_uid = %index_uid, \"resumed rebalance\");\n1506\t Ok(())\n1507\t } else {\n1508\t Err(format!(\"no rebalance job found for index {}\", index_uid))\n1509\t }\n1510\t }\n1511\t\n1512\t /// Load persisted jobs from task store on startup.\n1513\t pub async fn load_persisted_jobs(&self) -> Result<(), String> {\n1514\t let jobs = tokio::task::spawn_blocking({\n1515\t let task_store = self.task_store.clone();\n1516\t move || {\n1517\t task_store.list_jobs_by_state(\"running\")\n1518\t }\n1519\t })\n1520\t .await\n1521\t .map_err(|e| format!(\"failed to list jobs: {}\", e))?\n1522\t .map_err(|e| format!(\"failed to list jobs: {}\", e))?;\n1523\t\n1524\t for job_row in jobs {\n1525\t if job_row.type_ == \"rebalance\" {\n1526\t if let Ok(job) = serde_json::from_str::(&job_row.params) {\n1527\t info!(\n1528\t index_uid = %job.index_uid,\n1529\t \"loaded persisted rebalance job\"\n1530\t );\n1531\t let mut jobs = self.jobs.write().await;\n1532\t jobs.insert(job.id.clone(), job);\n1533\t }\n1534\t }\n1535\t }\n1536\t\n1537\t Ok(())\n1538\t }\n1539\t}\n1540\t\n1541\t/// Status of the rebalancer worker for monitoring.\n1542\t#[derive(Debug, Clone, Serialize, Deserialize)]\n1543\tpub struct RebalancerWorkerStatus {\n1544\t /// Number of active rebalance jobs.\n1545\t pub active_jobs: usize,\n1546\t /// Number of completed rebalance jobs.\n1547\t pub completed_jobs: usize,\n1548\t /// Number of paused rebalance jobs.\n1549\t pub paused_jobs: usize,\n1550\t /// Total number of shards across all jobs.\n1551\t pub total_shards: usize,\n1552\t /// Number of completed shard migrations.\n1553\t pub completed_shards: usize,\n1554\t}\n1555\t\n1556\t/// Get current time in milliseconds since Unix epoch.\n1557\tfn now_ms() -> i64 {\n1558\t std::time::SystemTime::now()\n1559\t .duration_since(std::time::UNIX_EPOCH)\n1560\t .unwrap_or_default()\n1561\t .as_millis() as i64\n1562\t}\n1563\t\n1564\t/// Convert a topology NodeId to a migration NodeId.\n1565\tfn topo_to_migration_node_id(id: &TopologyNodeId) -> MigrationNodeId {\n1566\t crate::migration::NodeId(id.as_str().to_string())\n1567\t}\n1568\t\n1569\t/// Convert a migration NodeId to a topology NodeId.\n1570\tfn migration_to_topo_node_id(id: &MigrationNodeId) -> TopologyNodeId {\n1571\t TopologyNodeId::new(id.0.clone())\n1572\t}\n1573\t\n1574\t/// Get the old node owner for a specific shard.\n1575\tfn old_node_owners_for_shard(old_owners: &HashMap, shard_id: u32) -> MigrationNodeId {\n1576\t old_owners.get(&ShardId(shard_id))\n1577\t .cloned()\n1578\t .unwrap_or_else(|| crate::migration::NodeId(\"unknown\".to_string()))\n1579\t}\n1580\t\n1581\t#[cfg(test)]\n1582\tmod tests {\n1583\t use super::*;\n1584\t use crate::config::MiroirConfig;\n1585\t use crate::migration::MigrationConfig;\n1586\t use crate::topology::Node;\n1587\t use std::sync::Arc;\n1588\t\n1589\t fn test_topology() -> Topology {\n1590\t let mut topo = Topology::new(64, 2, 2);\n1591\t topo.add_node(Node::new(\n1592\t TopologyNodeId::new(\"node-0\".into()),\n1593\t \"http://node-0:7700\".into(),\n1594\t 0,\n1595\t ));\n1596\t topo.add_node(Node::new(\n1597\t TopologyNodeId::new(\"node-1\".into()),\n1598\t \"http://node-1:7700\".into(),\n1599\t 0,\n1600\t ));\n1601\t topo.add_node(Node::new(\n1602\t TopologyNodeId::new(\"node-2\".into()),\n1603\t \"http://node-2:7700\".into(),\n1604\t 1,\n1605\t ));\n1606\t topo.add_node(Node::new(\n1607\t TopologyNodeId::new(\"node-3\".into()),\n1608\t \"http://node-3:7700\".into(),\n1609\t 1,\n1610\t ));\n1611\t topo\n1612\t }\n1613\t\n1614\t #[test]\n1615\t fn test_rebalance_job_id() {\n1616\t let job_id = RebalanceJobId::new(\"test-index\");\n1617\t assert_eq!(job_id.0, \"rebalance:test-index\");\n1618\t assert_eq!(job_id.index_uid(), \"test-index\");\n1619\t }\n1620\t\n1621\t #[test]\n1622\t fn test_worker_config_default() {\n1623\t let config = RebalancerWorkerConfig::default();\n1624\t assert_eq!(config.max_concurrent_migrations, 4);\n1625\t assert_eq!(config.lease_ttl_secs, LEASE_TTL_SECS);\n1626\t assert_eq!(config.lease_renewal_interval_ms, LEASE_RENEWAL_INTERVAL_MS);\n1627\t }\n1628\t\n1629\t #[tokio::test]\n1630\t async fn test_compute_affected_shards_for_add() {\n1631\t let topo = Arc::new(RwLock::new(test_topology()));\n1632\t let config = RebalancerWorkerConfig::default();\n1633\t\n1634\t // Create a mock task store (in-memory for testing)\n1635\t // Note: This would need a proper mock TaskStore implementation\n1636\t // For now, we'll skip the full integration test\n1637\t\n1638\t // Test that adding a node to group 0 affects some shards\n1639\t let new_node_id = \"node-new\";\n1640\t let replica_group = 0;\n1641\t\n1642\t // We'd need to instantiate the worker with a proper mock task store\n1643\t // This is a placeholder for the actual test\n1644\t }\n1645\t\n1646\t #[test]\n1647\t fn test_shard_migration_phase_serialization() {\n1648\t let phase = ShardMigrationPhase::MigrationInProgress;\n1649\t let json = serde_json::to_string(&phase).unwrap();\n1650\t assert!(json.contains(\"MigrationInProgress\"));\n1651\t\n1652\t let deserialized: ShardMigrationPhase = serde_json::from_str(&json).unwrap();\n1653\t assert_eq!(deserialized, phase);\n1654\t }\n1655\t\n1656\t #[test]\n1657\t fn test_topology_event_serialization() {\n1658\t let event = TopologyChangeEvent::NodeAdded {\n1659\t node_id: \"node-4\".to_string(),\n1660\t replica_group: 0,\n1661\t index_uid: \"test\".to_string(),\n1662\t };\n1663\t\n1664\t let json = serde_json::to_string(&event).unwrap();\n1665\t assert!(json.contains(\"NodeAdded\"));\n1666\t\n1667\t let deserialized: TopologyChangeEvent = serde_json::from_str(&json).unwrap();\n1668\t match deserialized {\n1669\t TopologyChangeEvent::NodeAdded {\n1670\t node_id,\n1671\t replica_group,\n1672\t index_uid,\n1673\t } => {\n1674\t assert_eq!(node_id, \"node-4\");\n1675\t assert_eq!(replica_group, 0);\n1676\t assert_eq!(index_uid, \"test\");\n1677\t }\n1678\t _ => panic!(\"wrong event type\"),\n1679\t }\n1680\t }\n1681\t}\n1682\t"}]},"parent_tool_use_id":"call_d8ab3450251e405481f12a94","session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","uuid":"f962e5a2-eb70-40cf-8b57-fd6ecd80f930","timestamp":"2026-05-23T05:57:17.535Z"} -{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_ee21dd075c6a455a885c463b","type":"tool_result","content":"1\t//! Task registry: manages Miroir task namespace.\n2\t//!\n3\t//! Phase 3: persistent backends (SQLite, Redis) alongside in-memory fallback.\n4\t\n5\tuse crate::Result;\n6\tuse crate::task::{MiroirTask, NodeTask, NodeTaskStatus, TaskStatus, TaskFilter};\n7\tuse crate::error::MiroirError;\n8\tuse crate::scatter::NodeClient;\n9\tuse crate::task_store::TaskStore;\n10\tuse crate::topology::{Topology, NodeId};\n11\tuse std::collections::HashMap;\n12\tuse std::sync::Arc;\n13\tuse tokio::sync::RwLock;\n14\tuse uuid::Uuid;\n15\t\n16\t/// In-memory task registry implementation.\n17\t#[derive(Debug, Clone)]\n18\tpub struct InMemoryTaskRegistry {\n19\t tasks: Arc>>,\n20\t}\n21\t\n22\t/// Trait for node polling operations.\n23\t/// Allows the task registry to poll nodes without tight coupling to HTTP client.\n24\t#[async_trait::async_trait]\n25\tpub trait NodePoller: Send + Sync {\n26\t /// Poll a single node for task status.\n27\t async fn poll_node_task(\n28\t &self,\n29\t node_id: &NodeId,\n30\t address: &str,\n31\t task_uid: u64,\n32\t ) -> std::result::Result;\n33\t}\n34\t\n35\t/// Node poller implementation using a NodeClient and Topology.\n36\tpub struct ClientNodePoller {\n37\t client: Arc,\n38\t topology: Arc,\n39\t}\n40\t\n41\timpl ClientNodePoller {\n42\t /// Create a new node poller with the given client and topology.\n43\t pub fn new(client: Arc, topology: Arc) -> Self {\n44\t Self { client, topology }\n45\t }\n46\t}\n47\t\n48\t#[async_trait::async_trait]\n49\timpl NodePoller for ClientNodePoller {\n50\t async fn poll_node_task(\n51\t &self,\n52\t node_id: &NodeId,\n53\t address: &str,\n54\t task_uid: u64,\n55\t ) -> std::result::Result {\n56\t use crate::scatter::TaskStatusRequest;\n57\t\n58\t let req = TaskStatusRequest { task_uid };\n59\t self.client\n60\t .get_task_status(node_id, address, &req)\n61\t .await\n62\t .map(|resp| resp.to_node_status())\n63\t .map_err(|e| format!(\"{:?}\", e))\n64\t }\n65\t}\n66\t\n67\timpl InMemoryTaskRegistry {\n68\t /// Create a new in-memory task registry.\n69\t pub fn new() -> Self {\n70\t Self {\n71\t tasks: Arc::new(RwLock::new(HashMap::new())),\n72\t }\n73\t }\n74\t\n75\t /// Register a new task with the given node tasks.\n76\t pub async fn register_async(&self, node_tasks: HashMap) -> Result {\n77\t self.register_async_with_metadata(node_tasks, None, None).await\n78\t }\n79\t\n80\t /// Register a new task with the given node tasks and metadata.\n81\t pub async fn register_async_with_metadata(\n82\t &self,\n83\t node_tasks: HashMap,\n84\t index_uid: Option,\n85\t task_type: Option,\n86\t ) -> Result {\n87\t let miroir_id = format!(\"mtask-{}\", Uuid::new_v4());\n88\t let created_at = std::time::SystemTime::now()\n89\t .duration_since(std::time::UNIX_EPOCH)\n90\t .map_err(|e| MiroirError::Task(format!(\"clock error: {}\", e)))?\n91\t .as_millis() as u64;\n92\t\n93\t let mut tasks = HashMap::new();\n94\t for (node_id, task_uid) in node_tasks {\n95\t tasks.insert(node_id, NodeTask {\n96\t task_uid,\n97\t status: NodeTaskStatus::Enqueued,\n98\t });\n99\t }\n100\t\n101\t let task = MiroirTask {\n102\t miroir_id: miroir_id.clone(),\n103\t created_at,\n104\t started_at: None,\n105\t finished_at: None,\n106\t status: TaskStatus::Enqueued,\n107\t index_uid,\n108\t task_type,\n109\t node_tasks: tasks,\n110\t error: None,\n111\t node_errors: HashMap::new(),\n112\t };\n113\t\n114\t // Insert the task\n115\t {\n116\t let mut registry = self.tasks.write().await;\n117\t registry.insert(miroir_id.clone(), task.clone());\n118\t }\n119\t\n120\t // Spawn a background task to poll for status updates (simulated for Phase 2)\n121\t let registry = self.clone();\n122\t let miroir_id_clone = miroir_id.clone();\n123\t tokio::spawn(async move {\n124\t registry.poll_task_status_simulated(&miroir_id_clone).await;\n125\t });\n126\t\n127\t Ok(task)\n128\t }\n129\t\n130\t /// Register a new task with the given node tasks and metadata, with real node polling.\n131\t ///\n132\t /// This version takes a NodePoller implementation to actually poll nodes for status updates.\n133\t pub async fn register_with_poller(\n134\t &self,\n135\t node_tasks: HashMap,\n136\t index_uid: Option,\n137\t task_type: Option,\n138\t poller: Arc

,\n139\t ) -> Result {\n140\t let miroir_id = format!(\"mtask-{}\", Uuid::new_v4());\n141\t let created_at = std::time::SystemTime::now()\n142\t .duration_since(std::time::UNIX_EPOCH)\n143\t .map_err(|e| MiroirError::Task(format!(\"clock error: {}\", e)))?\n144\t .as_millis() as u64;\n145\t\n146\t let mut tasks = HashMap::new();\n147\t for (node_id, task_uid) in node_tasks {\n148\t tasks.insert(node_id.clone(), NodeTask {\n149\t task_uid,\n150\t status: NodeTaskStatus::Enqueued,\n151\t });\n152\t }\n153\t\n154\t let task = MiroirTask {\n155\t miroir_id: miroir_id.clone(),\n156\t created_at,\n157\t started_at: None,\n158\t finished_at: None,\n159\t status: TaskStatus::Enqueued,\n160\t index_uid,\n161\t task_type,\n162\t node_tasks: tasks.clone(),\n163\t error: None,\n164\t node_errors: HashMap::new(),\n165\t };\n166\t\n167\t // Insert the task\n168\t {\n169\t let mut registry = self.tasks.write().await;\n170\t registry.insert(miroir_id.clone(), task.clone());\n171\t }\n172\t\n173\t // Spawn a background task to poll for status updates using real node polling\n174\t let registry = self.clone();\n175\t let miroir_id_clone = miroir_id.clone();\n176\t tokio::spawn(async move {\n177\t registry.poll_task_status_with_poller(&miroir_id_clone, poller).await;\n178\t });\n179\t\n180\t Ok(task)\n181\t }\n182\t\n183\t /// Get task by ID (async version).\n184\t pub async fn get_async(&self, miroir_id: &str) -> Option {\n185\t let tasks = self.tasks.read().await;\n186\t tasks.get(miroir_id).cloned()\n187\t }\n188\t\n189\t /// Delete a task from the registry.\n190\t pub async fn delete(&self, miroir_id: &str) -> Result {\n191\t let mut tasks = self.tasks.write().await;\n192\t Ok(tasks.remove(miroir_id).is_some())\n193\t }\n194\t\n195\t /// Count total tasks in the registry.\n196\t pub async fn count(&self) -> usize {\n197\t let tasks = self.tasks.read().await;\n198\t tasks.len()\n199\t }\n200\t\n201\t /// Prune old tasks (in-memory only, for Phase 3 this will use durable storage).\n202\t pub async fn prune_old_tasks(&self, _cutoff_ms: u64) -> Result {\n203\t // In-memory implementation: no pruning in Phase 2\n204\t // Phase 3 will add durable storage and pruning\n205\t Ok(0)\n206\t }\n207\t\n208\t /// Update the overall task status based on node task statuses.\n209\t pub async fn update_overall_status(&self, miroir_id: &str) -> Result {\n210\t let mut tasks = self.tasks.write().await;\n211\t let task = match tasks.get(miroir_id) {\n212\t Some(t) => t.clone(),\n213\t None => return Ok(false),\n214\t };\n215\t\n216\t // Determine overall status from node tasks\n217\t let mut all_succeeded = true;\n218\t let mut any_failed = false;\n219\t let mut all_terminal = true;\n220\t\n221\t for (_node_id, node_task) in &task.node_tasks {\n222\t match node_task.status {\n223\t NodeTaskStatus::Enqueued | NodeTaskStatus::Processing => {\n224\t all_terminal = false;\n225\t all_succeeded = false;\n226\t }\n227\t NodeTaskStatus::Succeeded => {}\n228\t NodeTaskStatus::Failed => {\n229\t any_failed = true;\n230\t }\n231\t }\n232\t }\n233\t\n234\t let new_status = if any_failed {\n235\t TaskStatus::Failed\n236\t } else if all_terminal && all_succeeded {\n237\t TaskStatus::Succeeded\n238\t } else if !all_terminal {\n239\t TaskStatus::Processing\n240\t } else {\n241\t TaskStatus::Enqueued\n242\t };\n243\t\n244\t if new_status != task.status {\n245\t if let Some(t) = tasks.get_mut(miroir_id) {\n246\t t.status = new_status;\n247\t }\n248\t Ok(true)\n249\t } else {\n250\t Ok(false)\n251\t }\n252\t }\n253\t\n254\t /// Poll node tasks to update the overall Miroir task status.\n255\t /// Uses exponential backoff: 25ms → 50 → 100 → ... → 1s cap.\n256\t ///\n257\t /// Phase 2: Simulates node polling (tasks complete after ~500ms)\n258\t /// Phase 3: Will poll actual nodes via HttpClient using topology\n259\t async fn poll_task_status_simulated(&self, miroir_id: &str) {\n260\t let mut delay_ms = 25u64;\n261\t let max_delay_ms = 1000u64;\n262\t\n263\t loop {\n264\t // Get the current task state\n265\t let task = self.get_async(miroir_id).await;\n266\t\n267\t let task = match task {\n268\t Some(t) => t,\n269\t None => return, // Task was deleted\n270\t };\n271\t\n272\t // Check if we've reached a terminal state\n273\t if matches!(task.status, TaskStatus::Succeeded | TaskStatus::Failed | TaskStatus::Canceled) {\n274\t return;\n275\t }\n276\t\n277\t // In a real implementation, we would query the nodes here\n278\t // For Phase 2, we simulate status progression\n279\t // Phase 3 will add actual node polling via HttpClient\n280\t\n281\t // Check each node task's status\n282\t let mut all_terminal = true;\n283\t for (_node_id, node_task) in &task.node_tasks {\n284\t match node_task.status {\n285\t NodeTaskStatus::Enqueued | NodeTaskStatus::Processing => {\n286\t all_terminal = false;\n287\t }\n288\t NodeTaskStatus::Succeeded | NodeTaskStatus::Failed => {}\n289\t }\n290\t }\n291\t\n292\t // For testing purposes, simulate tasks completing\n293\t // In production, this would poll actual nodes\n294\t if !all_terminal && delay_ms >= 500 {\n295\t // Simulate completion for testing\n296\t let mut tasks = self.tasks.write().await;\n297\t if let Some(t) = tasks.get_mut(miroir_id) {\n298\t for (_node_id, node_task) in &mut t.node_tasks {\n299\t if matches!(node_task.status, NodeTaskStatus::Enqueued | NodeTaskStatus::Processing) {\n300\t node_task.status = NodeTaskStatus::Succeeded;\n301\t }\n302\t }\n303\t // Update overall status\n304\t let mut all_succeeded = true;\n305\t let mut any_failed = false;\n306\t for (_node_id, node_task) in &t.node_tasks {\n307\t match node_task.status {\n308\t NodeTaskStatus::Succeeded => {}\n309\t NodeTaskStatus::Failed => any_failed = true,\n310\t NodeTaskStatus::Enqueued | NodeTaskStatus::Processing => {\n311\t all_succeeded = false;\n312\t }\n313\t }\n314\t }\n315\t if any_failed {\n316\t t.status = TaskStatus::Failed;\n317\t } else if all_succeeded {\n318\t t.status = TaskStatus::Succeeded;\n319\t } else {\n320\t t.status = TaskStatus::Processing;\n321\t }\n322\t // Set finished timestamp for terminal states\n323\t if matches!(t.status, TaskStatus::Succeeded | TaskStatus::Failed | TaskStatus::Canceled) {\n324\t t.finished_at = Some(std::time::SystemTime::now()\n325\t .duration_since(std::time::UNIX_EPOCH)\n326\t .unwrap_or_default()\n327\t .as_millis() as u64);\n328\t }\n329\t }\n330\t return;\n331\t }\n332\t\n333\t // Exponential backoff with cap\n334\t tokio::time::sleep(std::time::Duration::from_millis(delay_ms)).await;\n335\t delay_ms = (delay_ms * 2).min(max_delay_ms);\n336\t }\n337\t }\n338\t\n339\t /// Poll node tasks to update the overall Miroir task status, using real node polling.\n340\t /// Uses exponential backoff: 25ms → 50 → 100 → ... → 1s cap.\n341\t async fn poll_task_status_with_poller(&self, miroir_id: &str, poller: Arc

) {\n342\t let mut delay_ms = 25u64;\n343\t let max_delay_ms = 1000u64;\n344\t\n345\t loop {\n346\t // Get the current task state\n347\t let task = self.get_async(miroir_id).await;\n348\t\n349\t let task = match task {\n350\t Some(t) => t,\n351\t None => return, // Task was deleted\n352\t };\n353\t\n354\t // Check if we've reached a terminal state\n355\t if matches!(task.status, TaskStatus::Succeeded | TaskStatus::Failed | TaskStatus::Canceled) {\n356\t return;\n357\t }\n358\t\n359\t // Collect node IDs and task UIDs to poll\n360\t let node_polls: Vec<(NodeId, u64)> = task.node_tasks\n361\t .iter()\n362\t .filter(|(_, nt)| !matches!(nt.status, NodeTaskStatus::Succeeded | NodeTaskStatus::Failed))\n363\t .map(|(node_id, nt)| (NodeId::new(node_id.clone()), nt.task_uid))\n364\t .collect();\n365\t\n366\t if node_polls.is_empty() {\n367\t // All node tasks are terminal, update overall status\n368\t let mut tasks = self.tasks.write().await;\n369\t if let Some(t) = tasks.get_mut(miroir_id) {\n370\t let mut all_succeeded = true;\n371\t let mut any_failed = false;\n372\t for (_node_id, node_task) in &t.node_tasks {\n373\t match node_task.status {\n374\t NodeTaskStatus::Succeeded => {}\n375\t NodeTaskStatus::Failed => any_failed = true,\n376\t NodeTaskStatus::Enqueued | NodeTaskStatus::Processing => {\n377\t all_succeeded = false;\n378\t }\n379\t }\n380\t }\n381\t if any_failed {\n382\t t.status = TaskStatus::Failed;\n383\t } else if all_succeeded {\n384\t t.status = TaskStatus::Succeeded;\n385\t } else {\n386\t t.status = TaskStatus::Processing;\n387\t }\n388\t // Set finished timestamp for terminal states\n389\t if matches!(t.status, TaskStatus::Succeeded | TaskStatus::Failed | TaskStatus::Canceled) {\n390\t t.finished_at = Some(std::time::SystemTime::now()\n391\t .duration_since(std::time::UNIX_EPOCH)\n392\t .unwrap_or_default()\n393\t .as_millis() as u64);\n394\t }\n395\t }\n396\t return;\n397\t }\n398\t\n399\t // Poll each node for status\n400\t let mut node_statuses = HashMap::new();\n401\t for (node_id, task_uid) in &node_polls {\n402\t // Get node address from topology (would need topology here)\n403\t // For now, use a mock address - in production, this would come from the topology\n404\t let address = format!(\"http://{}\", node_id.as_str());\n405\t\n406\t match poller.poll_node_task(&node_id, &address, *task_uid).await {\n407\t Ok(status) => {\n408\t node_statuses.insert(node_id.clone(), status);\n409\t }\n410\t Err(e) => {\n411\t tracing::warn!(\"Failed to poll node {} for task {}: {}\", node_id, task_uid, e);\n412\t // On poll failure, keep the current status but mark for potential degradation\n413\t }\n414\t }\n415\t }\n416\t\n417\t // Update node task statuses\n418\t {\n419\t let mut tasks = self.tasks.write().await;\n420\t if let Some(t) = tasks.get_mut(miroir_id) {\n421\t for (node_id, status) in node_statuses {\n422\t if let Some(node_task) = t.node_tasks.get_mut(node_id.as_str()) {\n423\t node_task.status = status;\n424\t }\n425\t }\n426\t\n427\t // Update started_at timestamp if moving to processing\n428\t if t.status == TaskStatus::Enqueued {\n429\t let any_processing = t.node_tasks.values().any(|nt| {\n430\t matches!(nt.status, NodeTaskStatus::Processing)\n431\t });\n432\t if any_processing && t.started_at.is_none() {\n433\t t.started_at = Some(std::time::SystemTime::now()\n434\t .duration_since(std::time::UNIX_EPOCH)\n435\t .unwrap_or_default()\n436\t .as_millis() as u64);\n437\t t.status = TaskStatus::Processing;\n438\t }\n439\t }\n440\t }\n441\t }\n442\t\n443\t // Exponential backoff with cap\n444\t tokio::time::sleep(std::time::Duration::from_millis(delay_ms)).await;\n445\t delay_ms = (delay_ms * 2).min(max_delay_ms);\n446\t }\n447\t }\n448\t\n449\t /// List tasks with optional filtering (Meilisearch-compatible).\n450\t pub async fn list_async(&self, filter: &TaskFilter) -> Result> {\n451\t let guard = self.tasks.read().await;\n452\t let mut result: Vec = guard.values().cloned().collect();\n453\t\n454\t // Apply status filter\n455\t if let Some(status) = filter.status {\n456\t result.retain(|t| t.status == status);\n457\t }\n458\t\n459\t // Apply index_uid filter\n460\t if let Some(index_uid) = &filter.index_uid {\n461\t result.retain(|t| t.index_uid.as_ref().map_or(false, |uid| uid == index_uid));\n462\t }\n463\t\n464\t // Apply task_type filter\n465\t if let Some(task_type) = &filter.task_type {\n466\t result.retain(|t| t.task_type.as_ref().map_or(false, |ty| ty == task_type));\n467\t }\n468\t\n469\t // Apply offset\n470\t if let Some(offset) = filter.offset {\n471\t if offset < result.len() {\n472\t result = result[offset..].to_vec();\n473\t } else {\n474\t result.clear();\n475\t }\n476\t }\n477\t\n478\t // Apply limit\n479\t if let Some(limit) = filter.limit {\n480\t result.truncate(limit);\n481\t }\n482\t\n483\t Ok(result)\n484\t }\n485\t}\n486\t\n487\timpl Default for InMemoryTaskRegistry {\n488\t fn default() -> Self {\n489\t Self::new()\n490\t }\n491\t}\n492\t\n493\t/// Stub TaskRegistry implementation for compatibility.\n494\t/// This delegates to the async methods via tokio::task::block_in_place.\n495\t#[async_trait::async_trait]\n496\timpl crate::task::TaskRegistry for InMemoryTaskRegistry {\n497\t fn register_with_metadata(\n498\t &self,\n499\t node_tasks: HashMap,\n500\t index_uid: Option,\n501\t task_type: Option,\n502\t ) -> Result {\n503\t let registry = self.clone();\n504\t tokio::task::block_in_place(|| {\n505\t let rt = tokio::runtime::Handle::try_current()\n506\t .map_err(|e| MiroirError::Task(format!(\"runtime error: {}\", e)))?;\n507\t rt.block_on(async move {\n508\t registry.register_async_with_metadata(node_tasks, index_uid, task_type).await\n509\t })\n510\t })\n511\t }\n512\t\n513\t fn get(&self, miroir_id: &str) -> Result> {\n514\t let registry = self.clone();\n515\t let miroir_id = miroir_id.to_string();\n516\t tokio::task::block_in_place(|| {\n517\t let rt = tokio::runtime::Handle::try_current()\n518\t .map_err(|e| MiroirError::Task(format!(\"runtime error: {}\", e)))?;\n519\t rt.block_on(async move {\n520\t Ok(registry.get_async(&miroir_id).await)\n521\t })\n522\t })\n523\t }\n524\t\n525\t fn update_status(&self, miroir_id: &str, status: TaskStatus) -> Result<()> {\n526\t let registry = self.clone();\n527\t let miroir_id = miroir_id.to_string();\n528\t tokio::task::block_in_place(|| {\n529\t let rt = tokio::runtime::Handle::try_current()\n530\t .map_err(|e| MiroirError::Task(format!(\"runtime error: {}\", e)))?;\n531\t rt.block_on(async move {\n532\t let mut tasks = registry.tasks.write().await;\n533\t if let Some(task) = tasks.get_mut(&miroir_id) {\n534\t task.status = status;\n535\t }\n536\t Ok(())\n537\t })\n538\t })\n539\t }\n540\t\n541\t fn update_node_task(\n542\t &self,\n543\t miroir_id: &str,\n544\t node_id: &str,\n545\t node_status: NodeTaskStatus,\n546\t ) -> Result<()> {\n547\t let registry = self.clone();\n548\t let miroir_id = miroir_id.to_string();\n549\t let node_id = node_id.to_string();\n550\t tokio::task::block_in_place(|| {\n551\t let rt = tokio::runtime::Handle::try_current()\n552\t .map_err(|e| MiroirError::Task(format!(\"runtime error: {}\", e)))?;\n553\t rt.block_on(async move {\n554\t let mut tasks = registry.tasks.write().await;\n555\t if let Some(task) = tasks.get_mut(&miroir_id) {\n556\t if let Some(node_task) = task.node_tasks.get_mut(&node_id) {\n557\t node_task.status = node_status;\n558\t }\n559\t }\n560\t Ok(())\n561\t })\n562\t })\n563\t }\n564\t\n565\t fn list(&self, filter: TaskFilter) -> Result> {\n566\t let registry = self.clone();\n567\t tokio::task::block_in_place(|| {\n568\t let rt = tokio::runtime::Handle::try_current()\n569\t .map_err(|e| MiroirError::Task(format!(\"runtime error: {}\", e)))?;\n570\t rt.block_on(async move {\n571\t registry.list_async(&filter).await\n572\t })\n573\t })\n574\t }\n575\t\n576\t fn count(&self) -> usize {\n577\t let registry = self.clone();\n578\t tokio::task::block_in_place(|| {\n579\t let rt = match tokio::runtime::Handle::try_current() {\n580\t Ok(rt) => rt,\n581\t Err(_) => return 0,\n582\t };\n583\t rt.block_on(async move {\n584\t registry.count().await\n585\t })\n586\t })\n587\t }\n588\t}\n589\t\n590\t// ---------------------------------------------------------------------------\n591\t// TaskRegistryImpl — runtime-selected backend (Phase 3)\n592\t// ---------------------------------------------------------------------------\n593\t\n594\t/// Task status as lowercase string for store serialization.\n595\tfn status_to_str(s: TaskStatus) -> &'static str {\n596\t match s {\n597\t TaskStatus::Enqueued => \"enqueued\",\n598\t TaskStatus::Processing => \"processing\",\n599\t TaskStatus::Succeeded => \"succeeded\",\n600\t TaskStatus::Failed => \"failed\",\n601\t TaskStatus::Canceled => \"canceled\",\n602\t }\n603\t}\n604\t\n605\t/// Parse task status from store string.\n606\tfn str_to_status(s: &str) -> TaskStatus {\n607\t match s {\n608\t \"succeeded\" => TaskStatus::Succeeded,\n609\t \"failed\" => TaskStatus::Failed,\n610\t \"processing\" => TaskStatus::Processing,\n611\t \"canceled\" => TaskStatus::Canceled,\n612\t _ => TaskStatus::Enqueued,\n613\t }\n614\t}\n615\t\n616\t/// Convert a store `TaskRow` to a `MiroirTask`.\n617\t///\n618\t/// Per-node status is not persisted; all nodes are set to `Enqueued`.\n619\t/// The GET /tasks/{id} endpoint polls nodes to reconstruct per-node status.\n620\tfn row_to_task(row: crate::task_store::TaskRow) -> MiroirTask {\n621\t let node_tasks: HashMap = row\n622\t .node_tasks\n623\t .into_iter()\n624\t .map(|(node_id, task_uid)| {\n625\t (\n626\t node_id,\n627\t NodeTask {\n628\t task_uid,\n629\t status: NodeTaskStatus::Enqueued,\n630\t },\n631\t )\n632\t })\n633\t .collect();\n634\t\n635\t MiroirTask {\n636\t miroir_id: row.miroir_id,\n637\t created_at: row.created_at as u64,\n638\t started_at: row.started_at.map(|t| t as u64),\n639\t finished_at: row.finished_at.map(|t| t as u64),\n640\t status: str_to_status(&row.status),\n641\t index_uid: row.index_uid,\n642\t task_type: row.task_type,\n643\t node_tasks,\n644\t error: row.error,\n645\t node_errors: row.node_errors,\n646\t }\n647\t}\n648\t\n649\t/// Convert a route `TaskFilter` to a store `TaskFilter`.\n650\tfn filter_to_store(f: &TaskFilter) -> crate::task_store::TaskFilter {\n651\t crate::task_store::TaskFilter {\n652\t status: f.status.map(|s| status_to_str(s).to_string()),\n653\t index_uid: f.index_uid.clone(),\n654\t task_type: f.task_type.clone(),\n655\t limit: f.limit,\n656\t offset: f.offset,\n657\t }\n658\t}\n659\t\n660\t/// Runtime-selected task registry backend.\n661\t///\n662\t/// - `InMemory`: Phase 2 behaviour, tasks lost on restart (default for sqlite without path).\n663\t/// - `Sqlite`: persisted via `SqliteTaskStore`, survives restarts.\n664\t/// - `Redis`: persisted via `RedisTaskStore`, required for multi-replica HPA.\n665\t#[derive(Clone)]\n666\tpub enum TaskRegistryImpl {\n667\t InMemory(InMemoryTaskRegistry),\n668\t Sqlite(Arc),\n669\t #[cfg(feature = \"redis-store\")]\n670\t Redis(Arc),\n671\t}\n672\t\n673\timpl TaskRegistryImpl {\n674\t /// Open a SQLite-backed registry at the given path.\n675\t pub fn sqlite(path: &str) -> Result {\n676\t let store = crate::task_store::SqliteTaskStore::open(std::path::Path::new(path))?;\n677\t store.migrate()?;\n678\t Ok(Self::Sqlite(Arc::new(store)))\n679\t }\n680\t\n681\t /// Open a Redis-backed registry at the given URL.\n682\t #[cfg(feature = \"redis-store\")]\n683\t pub fn redis(url: &str) -> Result {\n684\t let store = tokio::task::block_in_place(|| {\n685\t tokio::runtime::Handle::current()\n686\t .block_on(crate::task_store::RedisTaskStore::open(url))\n687\t })?;\n688\t store.migrate()?;\n689\t Ok(Self::Redis(Arc::new(store)))\n690\t }\n691\t\n692\t /// In-memory fallback (no persistence).\n693\t pub fn in_memory() -> Self {\n694\t Self::InMemory(InMemoryTaskRegistry::new())\n695\t }\n696\t\n697\t /// Return a reference to the underlying `SqliteTaskStore`, if this is the Sqlite variant.\n698\t pub fn as_sqlite(&self) -> Option<&Arc> {\n699\t match self {\n700\t TaskRegistryImpl::Sqlite(s) => Some(s),\n701\t _ => None,\n702\t }\n703\t }\n704\t\n705\t /// Return a reference to the underlying `RedisTaskStore`, if this is the Redis variant.\n706\t #[cfg(feature = \"redis-store\")]\n707\t pub fn as_redis(&self) -> Option<&Arc> {\n708\t match self {\n709\t TaskRegistryImpl::Redis(r) => Some(r),\n710\t _ => None,\n711\t }\n712\t }\n713\t\n714\t /// Return a reference to the underlying `TaskStore` trait object, if this is a persisted variant.\n715\t pub fn as_task_store(&self) -> Option> {\n716\t match self {\n717\t TaskRegistryImpl::InMemory(_) => None,\n718\t TaskRegistryImpl::Sqlite(s) => Some(s.clone() as Arc),\n719\t #[cfg(feature = \"redis-store\")]\n720\t TaskRegistryImpl::Redis(r) => Some(r.clone() as Arc),\n721\t }\n722\t }\n723\t\n724\t /// Register a new task with metadata (sync, compatible with `TaskRegistry` trait).\n725\t pub fn register_with_metadata(\n726\t &self,\n727\t node_tasks: HashMap,\n728\t index_uid: Option,\n729\t task_type: Option,\n730\t ) -> Result {\n731\t match self {\n732\t TaskRegistryImpl::InMemory(r) => {\n733\t crate::task::TaskRegistry::register_with_metadata(\n734\t r, node_tasks, index_uid, task_type,\n735\t )\n736\t }\n737\t TaskRegistryImpl::Sqlite(store) => {\n738\t let miroir_id = format!(\"mtask-{}\", Uuid::new_v4());\n739\t let created_at = std::time::SystemTime::now()\n740\t .duration_since(std::time::UNIX_EPOCH)\n741\t .map_err(|e| MiroirError::Task(format!(\"clock error: {}\", e)))?\n742\t .as_millis() as i64;\n743\t\n744\t let new_task = crate::task_store::NewTask {\n745\t miroir_id: miroir_id.clone(),\n746\t created_at,\n747\t status: \"enqueued\".to_string(),\n748\t node_tasks,\n749\t error: None,\n750\t started_at: None,\n751\t finished_at: None,\n752\t index_uid,\n753\t task_type,\n754\t node_errors: HashMap::new(),\n755\t };\n756\t\n757\t store.insert_task(&new_task)?;\n758\t\n759\t Ok(MiroirTask {\n760\t miroir_id: new_task.miroir_id,\n761\t created_at: new_task.created_at as u64,\n762\t started_at: None,\n763\t finished_at: None,\n764\t status: TaskStatus::Enqueued,\n765\t index_uid: new_task.index_uid,\n766\t task_type: new_task.task_type,\n767\t node_tasks: new_task\n768\t .node_tasks\n769\t .into_iter()\n770\t .map(|(nid, uid)| (nid, NodeTask { task_uid: uid, status: NodeTaskStatus::Enqueued }))\n771\t .collect(),\n772\t error: None,\n773\t node_errors: HashMap::new(),\n774\t })\n775\t }\n776\t #[cfg(feature = \"redis-store\")]\n777\t TaskRegistryImpl::Redis(store) => {\n778\t let miroir_id = format!(\"mtask-{}\", Uuid::new_v4());\n779\t let created_at = std::time::SystemTime::now()\n780\t .duration_since(std::time::UNIX_EPOCH)\n781\t .map_err(|e| MiroirError::Task(format!(\"clock error: {}\", e)))?\n782\t .as_millis() as i64;\n783\t\n784\t let new_task = crate::task_store::NewTask {\n785\t miroir_id: miroir_id.clone(),\n786\t created_at,\n787\t status: \"enqueued\".to_string(),\n788\t node_tasks,\n789\t error: None,\n790\t started_at: None,\n791\t finished_at: None,\n792\t index_uid,\n793\t task_type,\n794\t node_errors: HashMap::new(),\n795\t };\n796\t\n797\t store.insert_task(&new_task)?;\n798\t\n799\t Ok(MiroirTask {\n800\t miroir_id: new_task.miroir_id,\n801\t created_at: new_task.created_at as u64,\n802\t started_at: None,\n803\t finished_at: None,\n804\t status: TaskStatus::Enqueued,\n805\t index_uid: new_task.index_uid,\n806\t task_type: new_task.task_type,\n807\t node_tasks: new_task\n808\t .node_tasks\n809\t .into_iter()\n810\t .map(|(nid, uid)| (nid, NodeTask { task_uid: uid, status: NodeTaskStatus::Enqueued }))\n811\t .collect(),\n812\t error: None,\n813\t node_errors: HashMap::new(),\n814\t })\n815\t }\n816\t }\n817\t }\n818\t\n819\t /// Get a task by Miroir ID.\n820\t pub fn get(&self, miroir_id: &str) -> Result> {\n821\t match self {\n822\t TaskRegistryImpl::InMemory(r) => crate::task::TaskRegistry::get(r, miroir_id),\n823\t TaskRegistryImpl::Sqlite(store) => {\n824\t Ok(store.get_task(miroir_id)?.map(row_to_task))\n825\t }\n826\t #[cfg(feature = \"redis-store\")]\n827\t TaskRegistryImpl::Redis(store) => {\n828\t Ok(store.get_task(miroir_id)?.map(row_to_task))\n829\t }\n830\t }\n831\t }\n832\t\n833\t /// Update the overall task status.\n834\t pub fn update_status(&self, miroir_id: &str, status: TaskStatus) -> Result<()> {\n835\t match self {\n836\t TaskRegistryImpl::InMemory(r) => {\n837\t crate::task::TaskRegistry::update_status(r, miroir_id, status)\n838\t }\n839\t TaskRegistryImpl::Sqlite(store) => {\n840\t store.update_task_status(miroir_id, status_to_str(status))?;\n841\t Ok(())\n842\t }\n843\t #[cfg(feature = \"redis-store\")]\n844\t TaskRegistryImpl::Redis(store) => {\n845\t store.update_task_status(miroir_id, status_to_str(status))?;\n846\t Ok(())\n847\t }\n848\t }\n849\t }\n850\t\n851\t /// Update a node task's status.\n852\t ///\n853\t /// For persistent backends this is a no-op for per-node status since it is\n854\t /// reconstructed from polling on each GET /tasks/{id}. The store only persists\n855\t /// the overall task status and node task UIDs.\n856\t pub fn update_node_task(\n857\t &self,\n858\t miroir_id: &str,\n859\t node_id: &str,\n860\t node_status: NodeTaskStatus,\n861\t ) -> Result<()> {\n862\t match self {\n863\t TaskRegistryImpl::InMemory(r) => {\n864\t crate::task::TaskRegistry::update_node_task(r, miroir_id, node_id, node_status)\n865\t }\n866\t // Per-node status is reconstructed from polling on each GET; not persisted.\n867\t #[cfg(feature = \"redis-store\")]\n868\t TaskRegistryImpl::Redis(_) => Ok(()),\n869\t TaskRegistryImpl::Sqlite(_) => Ok(()),\n870\t }\n871\t }\n872\t\n873\t /// List tasks with optional filtering.\n874\t pub fn list(&self, filter: TaskFilter) -> Result> {\n875\t match self {\n876\t TaskRegistryImpl::InMemory(r) => crate::task::TaskRegistry::list(r, filter),\n877\t TaskRegistryImpl::Sqlite(store) => {\n878\t let store_filter = filter_to_store(&filter);\n879\t let rows = store.list_tasks(&store_filter)?;\n880\t Ok(rows.into_iter().map(row_to_task).collect())\n881\t }\n882\t #[cfg(feature = \"redis-store\")]\n883\t TaskRegistryImpl::Redis(store) => {\n884\t let store_filter = filter_to_store(&filter);\n885\t let rows = store.list_tasks(&store_filter)?;\n886\t Ok(rows.into_iter().map(row_to_task).collect())\n887\t }\n888\t }\n889\t }\n890\t\n891\t /// Count total tasks.\n892\t pub fn count(&self) -> usize {\n893\t match self {\n894\t TaskRegistryImpl::InMemory(r) => crate::task::TaskRegistry::count(r),\n895\t TaskRegistryImpl::Sqlite(store) => {\n896\t store.task_count().unwrap_or(0) as usize\n897\t }\n898\t #[cfg(feature = \"redis-store\")]\n899\t TaskRegistryImpl::Redis(store) => {\n900\t store.task_count().unwrap_or(0) as usize\n901\t }\n902\t }\n903\t }\n904\t\n905\t /// Set error on a task.\n906\t pub fn set_error(&self, miroir_id: &str, error: &str) -> Result<()> {\n907\t match self {\n908\t TaskRegistryImpl::InMemory(_) => Ok(()),\n909\t TaskRegistryImpl::Sqlite(store) => {\n910\t store.set_task_error(miroir_id, error)?;\n911\t Ok(())\n912\t }\n913\t #[cfg(feature = \"redis-store\")]\n914\t TaskRegistryImpl::Redis(store) => {\n915\t store.set_task_error(miroir_id, error)?;\n916\t Ok(())\n917\t }\n918\t }\n919\t }\n920\t\n921\t // --- Alias methods (delegated to TaskStore) ---\n922\t\n923\t /// Get an alias by name.\n924\t pub fn get_alias(&self, name: &str) -> Result> {\n925\t match self {\n926\t TaskRegistryImpl::InMemory(_) => Ok(None),\n927\t TaskRegistryImpl::Sqlite(store) => {\n928\t Ok(store.get_alias(name)?.map(|row| crate::alias::Alias {\n929\t name: row.name,\n930\t kind: if row.kind == \"single\" {\n931\t crate::alias::AliasKind::Single\n932\t } else {\n933\t crate::alias::AliasKind::Multi\n934\t },\n935\t current_uid: row.current_uid,\n936\t target_uids: row.target_uids,\n937\t generation: row.version as u64,\n938\t created_at: row.created_at as u64,\n939\t updated_at: Some(row.created_at as u64), // Use created_at as fallback\n940\t }))\n941\t }\n942\t #[cfg(feature = \"redis-store\")]\n943\t TaskRegistryImpl::Redis(store) => {\n944\t Ok(store.get_alias(name)?.map(|row| crate::alias::Alias {\n945\t name: row.name,\n946\t kind: if row.kind == \"single\" {\n947\t crate::alias::AliasKind::Single\n948\t } else {\n949\t crate::alias::AliasKind::Multi\n950\t },\n951\t current_uid: row.current_uid,\n952\t target_uids: row.target_uids,\n953\t generation: row.version as u64,\n954\t created_at: row.created_at as u64,\n955\t updated_at: Some(row.created_at as u64), // Use created_at as fallback\n956\t }))\n957\t }\n958\t }\n959\t }\n960\t\n961\t /// Create a new alias.\n962\t pub fn put_alias(&self, alias: &crate::alias::Alias) -> Result<()> {\n963\t match self {\n964\t TaskRegistryImpl::InMemory(_) => Ok(()),\n965\t TaskRegistryImpl::Sqlite(store) => {\n966\t let new_alias = crate::task_store::NewAlias {\n967\t name: alias.name.clone(),\n968\t kind: if matches!(alias.kind, crate::alias::AliasKind::Single) {\n969\t \"single\".to_string()\n970\t } else {\n971\t \"multi\".to_string()\n972\t },\n973\t current_uid: alias.current_uid.clone(),\n974\t target_uids: alias.target_uids.clone(),\n975\t version: alias.generation as i64,\n976\t created_at: alias.created_at as i64,\n977\t history: vec![],\n978\t };\n979\t store.create_alias(&new_alias)\n980\t }\n981\t #[cfg(feature = \"redis-store\")]\n982\t TaskRegistryImpl::Redis(store) => {\n983\t let new_alias = crate::task_store::NewAlias {\n984\t name: alias.name.clone(),\n985\t kind: if matches!(alias.kind, crate::alias::AliasKind::Single) {\n986\t \"single\".to_string()\n987\t } else {\n988\t \"multi\".to_string()\n989\t },\n990\t current_uid: alias.current_uid.clone(),\n991\t target_uids: alias.target_uids.clone(),\n992\t version: alias.generation as i64,\n993\t created_at: alias.created_at as i64,\n994\t history: vec![],\n995\t };\n996\t store.create_alias(&new_alias)\n997\t }\n998\t }\n999\t }\n1000\t\n1001\t /// Delete an alias.\n1002\t pub fn delete_alias(&self, name: &str) -> Result {\n1003\t match self {\n1004\t TaskRegistryImpl::InMemory(_) => Ok(false),\n1005\t TaskRegistryImpl::Sqlite(store) => store.delete_alias(name),\n1006\t #[cfg(feature = \"redis-store\")]\n1007\t TaskRegistryImpl::Redis(store) => store.delete_alias(name),\n1008\t }\n1009\t }\n1010\t\n1011\t /// List all aliases.\n1012\t pub fn list_aliases(&self) -> Result> {\n1013\t match self {\n1014\t TaskRegistryImpl::InMemory(_) => Ok(vec![]),\n1015\t TaskRegistryImpl::Sqlite(store) => {\n1016\t let rows = store.list_aliases()?;\n1017\t Ok(rows.into_iter().map(|row| crate::alias::Alias {\n1018\t name: row.name,\n1019\t kind: if row.kind == \"single\" {\n1020\t crate::alias::AliasKind::Single\n1021\t } else {\n1022\t crate::alias::AliasKind::Multi\n1023\t },\n1024\t current_uid: row.current_uid,\n1025\t target_uids: row.target_uids,\n1026\t generation: row.version as u64,\n1027\t created_at: row.created_at as u64,\n1028\t updated_at: Some(row.created_at as u64),\n1029\t }).collect())\n1030\t }\n1031\t #[cfg(feature = \"redis-store\")]\n1032\t TaskRegistryImpl::Redis(store) => {\n1033\t let rows = store.list_aliases()?;\n1034\t Ok(rows.into_iter().map(|row| crate::alias::Alias {\n1035\t name: row.name,\n1036\t kind: if row.kind == \"single\" {\n1037\t crate::alias::AliasKind::Single\n1038\t } else {\n1039\t crate::alias::AliasKind::Multi\n1040\t },\n1041\t current_uid: row.current_uid,\n1042\t target_uids: row.target_uids,\n1043\t generation: row.version as u64,\n1044\t created_at: row.created_at as u64,\n1045\t updated_at: Some(row.created_at as u64),\n1046\t }).collect())\n1047\t }\n1048\t }\n1049\t }\n1050\t}\n1051\t\n1052\t#[async_trait::async_trait]\n1053\timpl crate::task::TaskRegistry for TaskRegistryImpl {\n1054\t fn register_with_metadata(\n1055\t &self,\n1056\t node_tasks: HashMap,\n1057\t index_uid: Option,\n1058\t task_type: Option,\n1059\t ) -> Result {\n1060\t TaskRegistryImpl::register_with_metadata(self, node_tasks, index_uid, task_type)\n1061\t }\n1062\t\n1063\t fn get(&self, miroir_id: &str) -> Result> {\n1064\t TaskRegistryImpl::get(self, miroir_id)\n1065\t }\n1066\t\n1067\t fn update_status(&self, miroir_id: &str, status: TaskStatus) -> Result<()> {\n1068\t TaskRegistryImpl::update_status(self, miroir_id, status)\n1069\t }\n1070\t\n1071\t fn update_node_task(\n1072\t &self,\n1073\t miroir_id: &str,\n1074\t node_id: &str,\n1075\t node_status: NodeTaskStatus,\n1076\t ) -> Result<()> {\n1077\t TaskRegistryImpl::update_node_task(self, miroir_id, node_id, node_status)\n1078\t }\n1079\t\n1080\t fn list(&self, filter: TaskFilter) -> Result> {\n1081\t TaskRegistryImpl::list(self, filter)\n1082\t }\n1083\t\n1084\t fn count(&self) -> usize {\n1085\t TaskRegistryImpl::count(self)\n1086\t }\n1087\t}\n1088\t\n1089\t#[cfg(test)]\n1090\tmod tests {\n1091\t use super::*;\n1092\t #[test]\n1093\t fn test_in_memory_register_creates_task() {\n1094\t let rt = tokio::runtime::Runtime::new().unwrap();\n1095\t let registry = InMemoryTaskRegistry::new();\n1096\t let mut node_tasks = HashMap::new();\n1097\t node_tasks.insert(\"node-0\".to_string(), 1);\n1098\t node_tasks.insert(\"node-1\".to_string(), 2);\n1099\t\n1100\t let task = rt.block_on(async {\n1101\t registry.register_async(node_tasks).await\n1102\t }).unwrap();\n1103\t assert!(task.miroir_id.starts_with(\"mtask-\"));\n1104\t assert_eq!(task.status, TaskStatus::Enqueued);\n1105\t assert_eq!(task.node_tasks.len(), 2);\n1106\t }\n1107\t\n1108\t #[test]\n1109\t fn test_in_memory_get_returns_task() {\n1110\t let rt = tokio::runtime::Runtime::new().unwrap();\n1111\t let registry = InMemoryTaskRegistry::new();\n1112\t let mut node_tasks = HashMap::new();\n1113\t node_tasks.insert(\"node-0\".to_string(), 1);\n1114\t\n1115\t let task = rt.block_on(async {\n1116\t registry.register_async(node_tasks).await\n1117\t }).unwrap();\n1118\t let retrieved = rt.block_on(async {\n1119\t registry.get_async(&task.miroir_id).await\n1120\t });\n1121\t assert!(retrieved.is_some());\n1122\t assert_eq!(retrieved.unwrap().miroir_id, task.miroir_id);\n1123\t }\n1124\t\n1125\t #[test]\n1126\t fn test_in_memory_list_filters_by_status() {\n1127\t let rt = tokio::runtime::Runtime::new().unwrap();\n1128\t let registry = InMemoryTaskRegistry::new();\n1129\t\n1130\t let mut node_tasks = HashMap::new();\n1131\t node_tasks.insert(\"node-0\".to_string(), 1);\n1132\t\n1133\t let (task1, _task2) = rt.block_on(async {\n1134\t let t1 = registry.register_async(node_tasks.clone()).await.unwrap();\n1135\t let t2 = registry.register_async(node_tasks).await.unwrap();\n1136\t (t1, t2)\n1137\t });\n1138\t\n1139\t // Update task1 to succeeded - must be done within runtime context\n1140\t let task1_id = task1.miroir_id.clone();\n1141\t rt.block_on(async {\n1142\t let mut tasks = registry.tasks.write().await;\n1143\t if let Some(t) = tasks.get_mut(&task1_id) {\n1144\t t.status = TaskStatus::Succeeded;\n1145\t }\n1146\t });\n1147\t\n1148\t let filter = TaskFilter {\n1149\t status: Some(TaskStatus::Succeeded),\n1150\t node_id: None,\n1151\t index_uid: None,\n1152\t task_type: None,\n1153\t limit: None,\n1154\t offset: None,\n1155\t };\n1156\t\n1157\t let tasks = rt.block_on(async {\n1158\t registry.list_async(&filter).await\n1159\t }).unwrap();\n1160\t assert_eq!(tasks.len(), 1);\n1161\t assert_eq!(tasks[0].miroir_id, task1.miroir_id);\n1162\t }\n1163\t\n1164\t #[test]\n1165\t fn test_in_memory_update_node_task() {\n1166\t let rt = tokio::runtime::Runtime::new().unwrap();\n1167\t let registry = InMemoryTaskRegistry::new();\n1168\t let mut node_tasks = HashMap::new();\n1169\t node_tasks.insert(\"node-0\".to_string(), 1);\n1170\t\n1171\t let task = rt.block_on(async {\n1172\t registry.register_async(node_tasks).await\n1173\t }).unwrap();\n1174\t\n1175\t // Update node task to succeeded - must be done within runtime context\n1176\t let task_id = task.miroir_id.clone();\n1177\t rt.block_on(async {\n1178\t let mut tasks = registry.tasks.write().await;\n1179\t if let Some(t) = tasks.get_mut(&task_id) {\n1180\t if let Some(nt) = t.node_tasks.get_mut(\"node-0\") {\n1181\t nt.status = NodeTaskStatus::Succeeded;\n1182\t }\n1183\t }\n1184\t });\n1185\t\n1186\t let retrieved = rt.block_on(async {\n1187\t registry.get_async(&task.miroir_id).await\n1188\t }).unwrap();\n1189\t assert_eq!(retrieved.node_tasks.get(\"node-0\").unwrap().status, NodeTaskStatus::Succeeded);\n1190\t }\n1191\t\n1192\t #[test]\n1193\t fn test_update_overall_status() {\n1194\t let rt = tokio::runtime::Runtime::new().unwrap();\n1195\t let registry = InMemoryTaskRegistry::new();\n1196\t let mut node_tasks = HashMap::new();\n1197\t node_tasks.insert(\"node-0\".to_string(), 1);\n1198\t node_tasks.insert(\"node-1\".to_string(), 2);\n1199\t\n1200\t let task = rt.block_on(async {\n1201\t registry.register_async(node_tasks).await\n1202\t }).unwrap();\n1203\t\n1204\t // Mark one node as succeeded, one as processing - must be done within runtime context\n1205\t let task_id = task.miroir_id.clone();\n1206\t rt.block_on(async {\n1207\t let mut tasks = registry.tasks.write().await;\n1208\t if let Some(t) = tasks.get_mut(&task_id) {\n1209\t if let Some(nt) = t.node_tasks.get_mut(\"node-0\") {\n1210\t nt.status = NodeTaskStatus::Succeeded;\n1211\t }\n1212\t if let Some(nt) = t.node_tasks.get_mut(\"node-1\") {\n1213\t nt.status = NodeTaskStatus::Processing;\n1214\t }\n1215\t }\n1216\t });\n1217\t\n1218\t // Overall status should still be enqueued/processing\n1219\t let updated = rt.block_on(async {\n1220\t registry.update_overall_status(&task.miroir_id).await\n1221\t }).unwrap();\n1222\t assert!(updated);\n1223\t\n1224\t let retrieved = rt.block_on(async {\n1225\t registry.get_async(&task.miroir_id).await\n1226\t }).unwrap();\n1227\t assert_eq!(retrieved.status, TaskStatus::Processing);\n1228\t }\n1229\t\n1230\t #[test]\n1231\t fn test_in_memory_list_filters_by_index_uid() {\n1232\t let rt = tokio::runtime::Runtime::new().unwrap();\n1233\t let registry = InMemoryTaskRegistry::new();\n1234\t\n1235\t let mut node_tasks = HashMap::new();\n1236\t node_tasks.insert(\"node-0\".to_string(), 1);\n1237\t\n1238\t let _task1 = rt.block_on(async {\n1239\t registry.register_async_with_metadata(\n1240\t node_tasks.clone(),\n1241\t Some(\"index-a\".to_string()),\n1242\t Some(\"documentAdditionOrUpdate\".to_string())\n1243\t ).await\n1244\t }).unwrap();\n1245\t let _task2 = rt.block_on(async {\n1246\t registry.register_async_with_metadata(\n1247\t node_tasks.clone(),\n1248\t Some(\"index-b\".to_string()),\n1249\t Some(\"documentAdditionOrUpdate\".to_string())\n1250\t ).await\n1251\t }).unwrap();\n1252\t\n1253\t // Filter by index_uid\n1254\t let filter = TaskFilter {\n1255\t status: None,\n1256\t node_id: None,\n1257\t index_uid: Some(\"index-a\".to_string()),\n1258\t task_type: None,\n1259\t limit: None,\n1260\t offset: None,\n1261\t };\n1262\t\n1263\t let tasks = rt.block_on(async {\n1264\t registry.list_async(&filter).await\n1265\t }).unwrap();\n1266\t assert_eq!(tasks.len(), 1);\n1267\t assert_eq!(tasks[0].index_uid, Some(\"index-a\".to_string()));\n1268\t }\n1269\t\n1270\t #[test]\n1271\t fn test_in_memory_list_filters_by_task_type() {\n1272\t let rt = tokio::runtime::Runtime::new().unwrap();\n1273\t let registry = InMemoryTaskRegistry::new();\n1274\t\n1275\t let mut node_tasks = HashMap::new();\n1276\t node_tasks.insert(\"node-0\".to_string(), 1);\n1277\t\n1278\t let _task1 = rt.block_on(async {\n1279\t registry.register_async_with_metadata(\n1280\t node_tasks.clone(),\n1281\t Some(\"test-index\".to_string()),\n1282\t Some(\"documentAdditionOrUpdate\".to_string())\n1283\t ).await\n1284\t }).unwrap();\n1285\t let _task2 = rt.block_on(async {\n1286\t registry.register_async_with_metadata(\n1287\t node_tasks.clone(),\n1288\t Some(\"test-index\".to_string()),\n1289\t Some(\"documentDeletion\".to_string())\n1290\t ).await\n1291\t }).unwrap();\n1292\t\n1293\t // Filter by task_type\n1294\t let filter = TaskFilter {\n1295\t status: None,\n1296\t node_id: None,\n1297\t index_uid: None,\n1298\t task_type: Some(\"documentAdditionOrUpdate\".to_string()),\n1299\t limit: None,\n1300\t offset: None,\n1301\t };\n1302\t\n1303\t let tasks = rt.block_on(async {\n1304\t registry.list_async(&filter).await\n1305\t }).unwrap();\n1306\t assert_eq!(tasks.len(), 1);\n1307\t assert_eq!(tasks[0].task_type, Some(\"documentAdditionOrUpdate\".to_string()));\n1308\t }\n1309\t\n1310\t #[test]\n1311\t fn test_exponential_backoff_simulation() {\n1312\t let rt = tokio::runtime::Runtime::new().unwrap();\n1313\t let registry = InMemoryTaskRegistry::new();\n1314\t let mut node_tasks = HashMap::new();\n1315\t node_tasks.insert(\"node-0\".to_string(), 1);\n1316\t node_tasks.insert(\"node-1\".to_string(), 2);\n1317\t node_tasks.insert(\"node-2\".to_string(), 3);\n1318\t\n1319\t let task = rt.block_on(async {\n1320\t registry.register_async(node_tasks).await\n1321\t }).unwrap();\n1322\t\n1323\t // Wait for task to complete (simulated exponential backoff: 25 + 50 + 100 + 200 + 400 = 775ms)\n1324\t rt.block_on(async {\n1325\t tokio::time::sleep(std::time::Duration::from_millis(800)).await;\n1326\t });\n1327\t\n1328\t let retrieved = rt.block_on(async {\n1329\t registry.get_async(&task.miroir_id).await\n1330\t }).unwrap();\n1331\t assert_eq!(retrieved.status, TaskStatus::Succeeded);\n1332\t assert!(retrieved.finished_at.is_some());\n1333\t }\n1334\t\n1335\t #[test]\n1336\t fn test_miroir_task_id_format() {\n1337\t let rt = tokio::runtime::Runtime::new().unwrap();\n1338\t let registry = InMemoryTaskRegistry::new();\n1339\t let mut node_tasks = HashMap::new();\n1340\t node_tasks.insert(\"node-0\".to_string(), 1);\n1341\t\n1342\t let task = rt.block_on(async {\n1343\t registry.register_async(node_tasks).await\n1344\t }).unwrap();\n1345\t assert!(task.miroir_id.starts_with(\"mtask-\"));\n1346\t // UUID format: 8-4-4-4-12 hex digits\n1347\t let uuid_part = &task.miroir_id[6..];\n1348\t assert_eq!(uuid_part.len(), 36);\n1349\t assert_eq!(&task.miroir_id[5..6], \"-\");\n1350\t }\n1351\t\n1352\t #[test]\n1353\t fn test_multiple_filters_combined() {\n1354\t let rt = tokio::runtime::Runtime::new().unwrap();\n1355\t let registry = InMemoryTaskRegistry::new();\n1356\t\n1357\t let mut node_tasks = HashMap::new();\n1358\t node_tasks.insert(\"node-0\".to_string(), 1);\n1359\t\n1360\t // Create tasks with different combinations\n1361\t let _task1 = rt.block_on(async {\n1362\t registry.register_async_with_metadata(\n1363\t node_tasks.clone(),\n1364\t Some(\"index-a\".to_string()),\n1365\t Some(\"documentAdditionOrUpdate\".to_string())\n1366\t ).await\n1367\t }).unwrap();\n1368\t let task2 = rt.block_on(async {\n1369\t registry.register_async_with_metadata(\n1370\t node_tasks.clone(),\n1371\t Some(\"index-b\".to_string()),\n1372\t Some(\"documentDeletion\".to_string())\n1373\t ).await\n1374\t }).unwrap();\n1375\t\n1376\t // Mark task2 as succeeded - must be done within runtime context\n1377\t let task2_id = task2.miroir_id.clone();\n1378\t rt.block_on(async {\n1379\t let mut tasks = registry.tasks.write().await;\n1380\t if let Some(t) = tasks.get_mut(&task2_id) {\n1381\t t.status = TaskStatus::Succeeded;\n1382\t }\n1383\t });\n1384\t\n1385\t // Filter by both index_uid and status\n1386\t let filter = TaskFilter {\n1387\t status: Some(TaskStatus::Succeeded),\n1388\t node_id: None,\n1389\t index_uid: Some(\"index-b\".to_string()),\n1390\t task_type: Some(\"documentDeletion\".to_string()),\n1391\t limit: None,\n1392\t offset: None,\n1393\t };\n1394\t\n1395\t let tasks = rt.block_on(async {\n1396\t registry.list_async(&filter).await\n1397\t }).unwrap();\n1398\t assert_eq!(tasks.len(), 1);\n1399\t assert_eq!(tasks[0].miroir_id, task2.miroir_id);\n1400\t }\n1401\t}\n1402\t"}]},"parent_tool_use_id":"call_d8ab3450251e405481f12a94","session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","uuid":"9894aa8f-78f9-4eb1-98f5-96d783ea6a61","timestamp":"2026-05-23T05:57:17.922Z"} -{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_e67e704e663b42829c90df58","type":"tool_result","content":"1\t//! Admin API endpoints for topology, readiness, shards, and metrics.\n2\t\n3\tuse axum::{\n4\t extract::{FromRef, Path, State},\n5\t http::{HeaderMap, StatusCode},\n6\t Json,\n7\t response::{IntoResponse, Response},\n8\t};\n9\tuse miroir_core::{\n10\t config::MiroirConfig,\n11\t migration::{MigrationConfig, MigrationCoordinator},\n12\t rebalancer::{MigrationExecutor, Rebalancer, RebalancerConfig, RebalancerMetrics},\n13\t rebalancer_worker::{RebalancerMetricsCallback, RebalancerWorker, RebalancerWorkerConfig, TopologyChangeEvent},\n14\t router,\n15\t scatter::{DeleteByFilterRequest, FetchDocumentsRequest, FetchDocumentsResponse, WriteRequest},\n16\t task_registry::TaskRegistryImpl,\n17\t task_store::{RedisTaskStore, TaskStore},\n18\t topology::{Node, NodeId, Topology},\n19\t};\n20\tuse rand::RngCore;\n21\tuse serde::{Deserialize, Serialize};\n22\tuse std::collections::HashMap;\n23\tuse std::sync::Arc;\n24\tuse std::time::Duration;\n25\tuse tokio::sync::RwLock;\n26\tuse tracing::{info, error, warn};\n27\tuse reqwest::Client;\n28\t\n29\tuse crate::{\n30\t admin_session::{seal_session, COOKIE_NAME, SealKey},\n31\t client::HttpClient,\n32\t scoped_key_rotation::{self, ScopedKeyRotationState, RotateScopedKeyRequest, RotateScopedKeyResponse},\n33\t};\n34\t\n35\t/// Hash a PII value (IP address) for safe log correlation.\n36\tfn hash_for_log(value: &str) -> String {\n37\t use std::hash::{Hash, Hasher};\n38\t let mut hasher = std::collections::hash_map::DefaultHasher::new();\n39\t value.hash(&mut hasher);\n40\t format!(\"{:016x}\", hasher.finish())\n41\t}\n42\t\n43\t/// Request body for POST /_miroir/admin/login.\n44\t#[derive(Deserialize)]\n45\tpub struct AdminLoginRequest {\n46\t pub admin_key: String,\n47\t}\n48\t\n49\timpl std::fmt::Debug for AdminLoginRequest {\n50\t fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {\n51\t f.debug_struct(\"AdminLoginRequest\")\n52\t .field(\"admin_key\", &\"[redacted]\")\n53\t .finish()\n54\t }\n55\t}\n56\t\n57\t/// Response body for POST /_miroir/admin/login.\n58\t#[derive(Debug, Serialize)]\n59\tpub struct AdminLoginResponse {\n60\t pub success: bool,\n61\t pub message: Option,\n62\t}\n63\t\n64\t/// Version state with cache for fetching Meilisearch version.\n65\t#[derive(Clone)]\n66\tpub struct VersionState {\n67\t pub node_master_key: String,\n68\t pub node_addresses: Vec,\n69\t pub version_cache: Arc>>,\n70\t pub last_cache_update: Arc>>,\n71\t pub cache_ttl_secs: u64,\n72\t}\n73\t\n74\timpl VersionState {\n75\t pub fn new(node_master_key: String, node_addresses: Vec) -> Self {\n76\t Self {\n77\t node_master_key,\n78\t node_addresses,\n79\t version_cache: Arc::new(RwLock::new(None)),\n80\t last_cache_update: Arc::new(RwLock::new(None)),\n81\t cache_ttl_secs: 60,\n82\t }\n83\t }\n84\t\n85\t /// Fetch version from a healthy node, using cache if within TTL.\n86\t pub async fn get_version(&self) -> Result {\n87\t // Check cache first\n88\t {\n89\t let cache = self.version_cache.read().await;\n90\t let last_update = self.last_cache_update.read().await;\n91\t if let (Some(ref cached), Some(last)) = (cache.as_ref(), last_update.as_ref()) {\n92\t if last.elapsed().as_secs() < self.cache_ttl_secs {\n93\t return Ok((**cached).clone());\n94\t }\n95\t }\n96\t }\n97\t\n98\t // Cache miss or expired - fetch from a node\n99\t let client = Client::builder()\n100\t .timeout(Duration::from_secs(2))\n101\t .build()\n102\t .map_err(|_| StatusCode::INTERNAL_SERVER_ERROR)?;\n103\t\n104\t for address in &self.node_addresses {\n105\t let url = format!(\"{}/version\", address.trim_end_matches('/'));\n106\t let response = client\n107\t .get(&url)\n108\t .header(\"Authorization\", format!(\"Bearer {}\", self.node_master_key))\n109\t .send()\n110\t .await;\n111\t\n112\t if let Ok(resp) = response {\n113\t if resp.status().is_success() {\n114\t if let Ok(body) = resp.text().await {\n115\t // Update cache\n116\t *self.version_cache.write().await = Some(body.clone());\n117\t *self.last_cache_update.write().await = Some(std::time::Instant::now());\n118\t return Ok(body);\n119\t }\n120\t }\n121\t }\n122\t }\n123\t\n124\t Err(StatusCode::SERVICE_UNAVAILABLE)\n125\t }\n126\t}\n127\t\n128\t// ---------------------------------------------------------------------------\n129\t// Local Rate Limiter (for single-pod deployments)\n130\t// ---------------------------------------------------------------------------\n131\t\n132\t/// In-memory rate limiter for admin login (local backend only).\n133\t/// Thread-safe using Arc>.\n134\t#[derive(Debug, Clone)]\n135\tpub struct LocalAdminRateLimiter {\n136\t inner: Arc>,\n137\t}\n138\t\n139\t#[derive(Debug, Default)]\n140\tstruct LocalAdminRateLimiterInner {\n141\t /// Map of IP -> (request_timestamps_ms, failed_count, backoff_until_ms)\n142\t state: HashMap,\n143\t}\n144\t\n145\t#[derive(Debug, Default, Clone)]\n146\tstruct LocalRateLimitState {\n147\t /// Timestamps of recent requests (for sliding window)\n148\t request_timestamps_ms: Vec,\n149\t /// Consecutive failed login attempts\n150\t failed_count: u32,\n151\t /// Unix timestamp (ms) when backoff expires\n152\t backoff_until_ms: Option,\n153\t}\n154\t\n155\timpl LocalAdminRateLimiter {\n156\t pub fn new() -> Self {\n157\t Self {\n158\t inner: Arc::new(std::sync::Mutex::new(LocalAdminRateLimiterInner::default())),\n159\t }\n160\t }\n161\t\n162\t /// Check rate limit and exponential backoff.\n163\t /// Returns (allowed, wait_seconds).\n164\t pub fn check(\n165\t &self,\n166\t ip: &str,\n167\t limit: u64,\n168\t window_ms: u64,\n169\t failed_threshold: u32,\n170\t backoff_start_minutes: u64,\n171\t backoff_max_hours: u64,\n172\t ) -> (bool, Option) {\n173\t let mut inner = self.inner.lock().unwrap();\n174\t let now = now_ms();\n175\t let state = inner.state.entry(ip.to_string()).or_default();\n176\t\n177\t // Check if we're in backoff mode\n178\t if let Some(backoff_until) = state.backoff_until_ms {\n179\t if backoff_until > now {\n180\t let wait_seconds = ((backoff_until - now) / 1000) as u64;\n181\t return (false, Some(wait_seconds));\n182\t }\n183\t // Backoff expired, clear it\n184\t state.backoff_until_ms = None;\n185\t }\n186\t\n187\t // Clean old timestamps outside the window\n188\t state.request_timestamps_ms.retain(|&ts| now - ts < window_ms as i64);\n189\t\n190\t // Check if limit exceeded\n191\t if state.request_timestamps_ms.len() >= limit as usize {\n192\t // Enter backoff mode after threshold consecutive failures\n193\t let failed = state.failed_count + 1;\n194\t state.failed_count = failed;\n195\t\n196\t if failed >= failed_threshold {\n197\t let backoff_minutes = backoff_start_minutes * (1u64 << ((failed - failed_threshold) as u64).min(7)); // Cap at 2^7 = 128x\n198\t let backoff_seconds = (backoff_minutes * 60).min(backoff_max_hours * 3600);\n199\t state.backoff_until_ms = Some(now + (backoff_seconds as i64 * 1000));\n200\t return (false, Some(backoff_seconds));\n201\t }\n202\t\n203\t return (false, None);\n204\t }\n205\t\n206\t // Record this request\n207\t state.request_timestamps_ms.push(now);\n208\t (true, None)\n209\t }\n210\t\n211\t /// Reset rate limit and backoff state on successful login.\n212\t pub fn reset(&self, ip: &str) {\n213\t let mut inner = self.inner.lock().unwrap();\n214\t inner.state.remove(ip);\n215\t }\n216\t\n217\t /// Record a failed login attempt (for backoff calculation).\n218\t pub fn record_failure(&self, ip: &str, failed_threshold: u32, backoff_start_minutes: u64, backoff_max_hours: u64) -> Option {\n219\t let mut inner = self.inner.lock().unwrap();\n220\t let now = now_ms();\n221\t let state = inner.state.entry(ip.to_string()).or_default();\n222\t\n223\t state.failed_count += 1;\n224\t\n225\t if state.failed_count >= failed_threshold {\n226\t let backoff_minutes = backoff_start_minutes * (1u64 << ((state.failed_count - failed_threshold) as u64).min(7));\n227\t let backoff_seconds = (backoff_minutes * 60).min(backoff_max_hours * 3600);\n228\t state.backoff_until_ms = Some(now + (backoff_seconds as i64 * 1000));\n229\t return Some(backoff_seconds);\n230\t }\n231\t\n232\t None\n233\t }\n234\t}\n235\t\n236\timpl Default for LocalAdminRateLimiter {\n237\t fn default() -> Self {\n238\t Self::new()\n239\t }\n240\t}\n241\t\n242\t/// In-memory rate limiter for search UI (local backend only).\n243\t/// Thread-safe using Arc>.\n244\t#[derive(Debug, Clone)]\n245\tpub struct LocalSearchUiRateLimiter {\n246\t inner: Arc>,\n247\t}\n248\t\n249\t#[derive(Debug, Default)]\n250\tstruct LocalSearchUiRateLimiterInner {\n251\t /// Map of IP -> request_timestamps_ms\n252\t state: HashMap>,\n253\t}\n254\t\n255\timpl LocalSearchUiRateLimiter {\n256\t pub fn new() -> Self {\n257\t Self {\n258\t inner: Arc::new(std::sync::Mutex::new(LocalSearchUiRateLimiterInner::default())),\n259\t }\n260\t }\n261\t\n262\t /// Check rate limit for search UI.\n263\t /// Returns (allowed, wait_seconds).\n264\t pub fn check(\n265\t &self,\n266\t ip: &str,\n267\t limit: u64,\n268\t window_ms: u64,\n269\t ) -> (bool, Option) {\n270\t let mut inner = self.inner.lock().unwrap();\n271\t let now = now_ms();\n272\t let timestamps = inner.state.entry(ip.to_string()).or_default();\n273\t\n274\t // Clean old timestamps outside the window\n275\t timestamps.retain(|&ts| now - ts < window_ms as i64);\n276\t\n277\t // Check if limit exceeded\n278\t if timestamps.len() >= limit as usize {\n279\t return (false, None);\n280\t }\n281\t\n282\t // Record this request\n283\t timestamps.push(now);\n284\t (true, None)\n285\t }\n286\t}\n287\t\n288\timpl Default for LocalSearchUiRateLimiter {\n289\t fn default() -> Self {\n290\t Self::new()\n291\t }\n292\t}\n293\t\n294\t/// Get current time in milliseconds since Unix epoch.\n295\tfn now_ms() -> i64 {\n296\t std::time::SystemTime::now()\n297\t .duration_since(std::time::UNIX_EPOCH)\n298\t .unwrap_or_default()\n299\t .as_millis() as i64\n300\t}\n301\t\n302\t/// Shared application state for admin endpoints.\n303\t#[derive(Clone)]\n304\tpub struct AppState {\n305\t pub config: Arc,\n306\t pub topology: Arc>,\n307\t pub ready: Arc>,\n308\t pub metrics: super::super::middleware::Metrics,\n309\t pub version_state: VersionState,\n310\t pub task_registry: Arc,\n311\t pub redis_store: Option,\n312\t pub task_store: Option>,\n313\t pub pod_id: String,\n314\t pub seal_key: SealKey,\n315\t pub local_rate_limiter: LocalAdminRateLimiter,\n316\t pub local_search_ui_rate_limiter: LocalSearchUiRateLimiter,\n317\t pub rebalancer: Option>,\n318\t pub migration_coordinator: Option>>,\n319\t pub rebalancer_worker: Option>,\n320\t pub rebalancer_metrics: Arc>,\n321\t /// Track previous documents migrated value for delta calculation.\n322\t pub previous_docs_migrated: Arc,\n323\t /// Two-phase settings broadcast coordinator (§13.5).\n324\t pub settings_broadcast: Arc,\n325\t /// Settings drift reconciler worker (§13.5).\n326\t pub drift_reconciler: Option>,\n327\t /// Session pinning manager (§13.6).\n328\t pub session_manager: Arc,\n329\t /// Alias registry (§13.7).\n330\t pub alias_registry: Arc,\n331\t}\n332\t\n333\timpl AppState {\n334\t pub fn new(\n335\t config: MiroirConfig,\n336\t metrics: super::super::middleware::Metrics,\n337\t seal_key: SealKey,\n338\t ) -> Self {\n339\t Self::with_redis(config, metrics, None, \"unknown\".into(), seal_key)\n340\t }\n341\t\n342\t pub fn with_redis(\n343\t config: MiroirConfig,\n344\t metrics: super::super::middleware::Metrics,\n345\t redis_store: Option,\n346\t pod_id: String,\n347\t seal_key: SealKey,\n348\t ) -> Self {\n349\t // Build initial topology from config\n350\t let mut topology = Topology::new(\n351\t config.shards,\n352\t config.replica_groups,\n353\t config.replication_factor as usize,\n354\t );\n355\t\n356\t for node_config in &config.nodes {\n357\t let node = Node::new(\n358\t NodeId::new(node_config.id.clone()),\n359\t node_config.address.clone(),\n360\t node_config.replica_group,\n361\t );\n362\t // Start nodes in Joining state - health checker will promote to Active\n363\t topology.add_node(node);\n364\t }\n365\t\n366\t let version_state = VersionState::new(\n367\t config.node_master_key.clone(),\n368\t config.nodes.iter().map(|n| n.address.clone()).collect(),\n369\t );\n370\t\n371\t // Select task registry backend based on config\n372\t let task_registry = match config.task_store.backend.as_str() {\n373\t \"redis\" if redis_store.is_some() => {\n374\t let store = redis_store.as_ref().unwrap().clone();\n375\t store.migrate().expect(\"Redis migration failed\");\n376\t TaskRegistryImpl::Redis(Arc::new(store))\n377\t }\n378\t \"sqlite\" if !config.task_store.path.is_empty() => {\n379\t TaskRegistryImpl::sqlite(&config.task_store.path)\n380\t .expect(\"Failed to open SQLite task store\")\n381\t }\n382\t _ => TaskRegistryImpl::in_memory(),\n383\t };\n384\t\n385\t let topology_arc = Arc::new(RwLock::new(topology));\n386\t\n387\t // Initialize rebalancer and migration coordinator\n388\t let rebalancer_config = RebalancerConfig {\n389\t max_concurrent_migrations: config.rebalancer.max_concurrent_migrations,\n390\t migration_timeout_s: config.rebalancer.migration_timeout_s,\n391\t auto_rebalance_on_recovery: config.rebalancer.auto_rebalance_on_recovery,\n392\t migration_batch_size: 1000,\n393\t migration_batch_delay_ms: 100,\n394\t };\n395\t\n396\t let migration_config = MigrationConfig {\n397\t drain_timeout: std::time::Duration::from_secs(30),\n398\t skip_delta_pass: false,\n399\t anti_entropy_enabled: config.anti_entropy.enabled,\n400\t };\n401\t\n402\t let migration_coordinator = Arc::new(RwLock::new(\n403\t MigrationCoordinator::new(migration_config.clone())\n404\t ));\n405\t\n406\t // Create migration executor for actual HTTP document migration\n407\t use miroir_core::rebalancer::HttpMigrationExecutor;\n408\t let migration_executor = Arc::new(HttpMigrationExecutor::new(\n409\t config.node_master_key.clone(),\n410\t config.scatter.node_timeout_ms,\n411\t ));\n412\t\n413\t let rebalancer = Arc::new(Rebalancer::new(\n414\t rebalancer_config.clone(),\n415\t topology_arc.clone(),\n416\t migration_config.clone(),\n417\t ).with_migration_executor(migration_executor));\n418\t\n419\t // Create rebalancer metrics\n420\t let rebalancer_metrics = Arc::new(RwLock::new(RebalancerMetrics::default()));\n421\t\n422\t // Get or create task store for rebalancer worker\n423\t let task_store: Option> = match config.task_store.backend.as_str() {\n424\t \"redis\" => {\n425\t redis_store.as_ref().map(|s| Arc::new(s.clone()) as Arc)\n426\t }\n427\t \"sqlite\" if !config.task_store.path.is_empty() => {\n428\t Some(Arc::new(miroir_core::task_store::SqliteTaskStore::open(\n429\t std::path::Path::new(&config.task_store.path)\n430\t ).expect(\"Failed to open SQLite task store\")) as Arc)\n431\t }\n432\t _ => None,\n433\t };\n434\t\n435\t // Create rebalancer worker if task store is available\n436\t let rebalancer_worker = if let Some(ref store) = task_store {\n437\t let worker_config = RebalancerWorkerConfig {\n438\t max_concurrent_migrations: config.rebalancer.max_concurrent_migrations,\n439\t lease_ttl_secs: 10,\n440\t lease_renewal_interval_ms: 2000,\n441\t migration_batch_size: 1000,\n442\t migration_batch_delay_ms: 100,\n443\t event_channel_capacity: 100,\n444\t };\n445\t\n446\t // Create metrics callback for rebalancer operations\n447\t let metrics_for_worker = metrics.clone();\n448\t let rebalancer_metrics_callback: RebalancerMetricsCallback = Arc::new(\n449\t move |in_progress: bool, docs_migrated: Option, duration_secs: Option| {\n450\t if in_progress {\n451\t metrics_for_worker.set_rebalance_in_progress(true);\n452\t } else {\n453\t metrics_for_worker.set_rebalance_in_progress(false);\n454\t }\n455\t if let Some(count) = docs_migrated {\n456\t metrics_for_worker.inc_rebalance_documents_migrated(count);\n457\t }\n458\t if let Some(duration) = duration_secs {\n459\t metrics_for_worker.observe_rebalance_duration(duration);\n460\t }\n461\t }\n462\t );\n463\t\n464\t Some(Arc::new(RebalancerWorker::with_metrics(\n465\t worker_config,\n466\t topology_arc.clone(),\n467\t store.clone(),\n468\t rebalancer.clone(),\n469\t migration_coordinator.clone(),\n470\t rebalancer_metrics.clone(),\n471\t pod_id.clone(),\n472\t Some(rebalancer_metrics_callback),\n473\t )))\n474\t } else {\n475\t None\n476\t };\n477\t\n478\t // Create settings broadcast coordinator (§13.5)\n479\t let settings_broadcast = if let Some(ref store) = task_store {\n480\t Arc::new(miroir_core::settings::SettingsBroadcast::with_task_store(store.clone()))\n481\t } else {\n482\t Arc::new(miroir_core::settings::SettingsBroadcast::new())\n483\t };\n484\t\n485\t // Create drift reconciler worker (§13.5) if task store is available\n486\t let drift_reconciler = if let Some(ref store) = task_store {\n487\t let node_addresses = config.nodes.iter().map(|n| n.address.clone()).collect();\n488\t let drift_config = miroir_core::rebalancer_worker::DriftReconcilerConfig {\n489\t interval_s: config.settings_drift_check.interval_s,\n490\t auto_repair: config.settings_drift_check.auto_repair,\n491\t lease_ttl_secs: 10,\n492\t lease_renewal_interval_ms: 2000,\n493\t };\n494\t Some(Arc::new(miroir_core::rebalancer_worker::DriftReconciler::new(\n495\t drift_config,\n496\t settings_broadcast.clone(),\n497\t store.clone(),\n498\t node_addresses,\n499\t config.node_master_key.clone(),\n500\t pod_id.clone(),\n501\t )))\n502\t } else {\n503\t None\n504\t };\n505\t\n506\t // Create session pinning manager (§13.6)\n507\t let session_manager = Arc::new(miroir_core::session_pinning::SessionManager::new(\n508\t miroir_core::session_pinning::SessionPinningConfig::from(\n509\t config.session_pinning.clone()\n510\t ),\n511\t ));\n512\t\n513\t // Create alias registry (§13.7)\n514\t // Note: Aliases are loaded asynchronously in background, not during initialization\n515\t let alias_registry = Arc::new(miroir_core::alias::AliasRegistry::new());\n516\t\n517\t Self {\n518\t config: Arc::new(config),\n519\t topology: topology_arc,\n520\t ready: Arc::new(RwLock::new(false)),\n521\t metrics,\n522\t version_state,\n523\t task_registry: Arc::new(task_registry),\n524\t redis_store,\n525\t task_store,\n526\t pod_id,\n527\t seal_key,\n528\t local_rate_limiter: LocalAdminRateLimiter::new(),\n529\t local_search_ui_rate_limiter: LocalSearchUiRateLimiter::new(),\n530\t rebalancer: Some(rebalancer),\n531\t migration_coordinator: Some(migration_coordinator),\n532\t rebalancer_worker,\n533\t rebalancer_metrics,\n534\t previous_docs_migrated: Arc::new(std::sync::atomic::AtomicU64::new(0)),\n535\t settings_broadcast,\n536\t drift_reconciler,\n537\t session_manager,\n538\t alias_registry,\n539\t }\n540\t }\n541\t\n542\t /// Mark the service as ready (all nodes reachable).\n543\t pub async fn mark_ready(&self) {\n544\t *self.ready.write().await = true;\n545\t info!(\"Service marked as ready\");\n546\t }\n547\t\n548\t /// Check if a covering quorum is reachable.\n549\t pub async fn check_covering_quorum(&self) -> bool {\n550\t let topo = self.topology.read().await;\n551\t let node_map = topo.node_map();\n552\t\n553\t // For each replica group, check if we have enough healthy nodes\n554\t for group in topo.groups() {\n555\t let healthy = group.healthy_nodes(&node_map);\n556\t let required = (topo.rf() + 1) / 2; // Simple majority for quorum\n557\t if healthy.len() < required {\n558\t return false;\n559\t }\n560\t }\n561\t\n562\t true\n563\t }\n564\t\n565\t /// Sync rebalancer metrics to Prometheus (called from health checker).\n566\t pub async fn sync_rebalancer_metrics_to_prometheus(&self) {\n567\t if let Some(ref rebalancer) = self.rebalancer {\n568\t let rebalancer_metrics = rebalancer.metrics.read().await;\n569\t let in_progress = rebalancer_metrics.rebalance_start_time.is_some();\n570\t self.metrics.set_rebalance_in_progress(in_progress);\n571\t\n572\t // Calculate delta for documents migrated counter\n573\t let current_total = rebalancer_metrics.documents_migrated_total;\n574\t let previous = self.previous_docs_migrated.load(std::sync::atomic::Ordering::Relaxed);\n575\t if current_total > previous {\n576\t let delta = current_total - previous;\n577\t self.metrics.inc_rebalance_documents_migrated(delta);\n578\t self.previous_docs_migrated.store(current_total, std::sync::atomic::Ordering::Relaxed);\n579\t }\n580\t\n581\t let duration = rebalancer_metrics.current_duration_secs();\n582\t if duration > 0.0 {\n583\t self.metrics.observe_rebalance_duration(duration);\n584\t }\n585\t }\n586\t }\n587\t}\n588\t\n589\t/// Response for GET /_miroir/topology (plan §10 JSON shape).\n590\t#[derive(Debug, Clone, Serialize, Deserialize)]\n591\tpub struct TopologyResponse {\n592\t pub shards: u32,\n593\t pub replication_factor: u32,\n594\t pub nodes: Vec,\n595\t pub degraded_node_count: u32,\n596\t pub rebalance_in_progress: bool,\n597\t pub fully_covered: bool,\n598\t}\n599\t\n600\t/// Per-node information in the topology response.\n601\t#[derive(Debug, Clone, Serialize, Deserialize)]\n602\tpub struct NodeInfo {\n603\t pub id: String,\n604\t pub address: String,\n605\t pub status: String,\n606\t pub shard_count: u32,\n607\t pub last_seen_ms: u64,\n608\t #[serde(skip_serializing_if = \"Option::is_none\")]\n609\t pub error: Option,\n610\t}\n611\t\n612\t/// Response for GET /_miroir/shards.\n613\t#[derive(Debug, Clone, Serialize, Deserialize)]\n614\tpub struct ShardsResponse {\n615\t pub shards: HashMap>, // shard_id -> list of node IDs\n616\t}\n617\t\n618\t/// GET /_miroir/topology — full cluster state per plan §10.\n619\tpub async fn get_topology(State(state): State) -> Result, StatusCode>\n620\twhere\n621\t S: Clone + Send + Sync + 'static,\n622\t AppState: FromRef,\n623\t{\n624\t let state = AppState::from_ref(&state);\n625\t let topo = state.topology.read().await;\n626\t\n627\t // Count degraded nodes\n628\t let degraded_count = topo.nodes().filter(|n| !n.is_healthy()).count() as u32;\n629\t\n630\t // Check rebalance status\n631\t let rebalance_in_progress = if let Some(ref rebalancer) = state.rebalancer {\n632\t let status = rebalancer.status().await;\n633\t status.in_progress\n634\t } else {\n635\t false\n636\t };\n637\t\n638\t // Build node info list\n639\t let nodes: Vec = topo\n640\t .nodes()\n641\t .map(|n| NodeInfo {\n642\t id: n.id.as_str().to_string(),\n643\t address: n.address.clone(),\n644\t status: format!(\"{:?}\", n.status).to_lowercase(),\n645\t shard_count: 0, // TODO: compute from routing table\n646\t last_seen_ms: 0, // TODO: track last health check time\n647\t error: None, // TODO: populate from last health check error\n648\t })\n649\t .collect();\n650\t\n651\t // Check if fully covered\n652\t let fully_covered = degraded_count == 0;\n653\t\n654\t let response = TopologyResponse {\n655\t shards: topo.shards,\n656\t replication_factor: topo.rf() as u32,\n657\t nodes,\n658\t degraded_node_count: degraded_count,\n659\t rebalance_in_progress,\n660\t fully_covered,\n661\t };\n662\t\n663\t Ok(Json(response))\n664\t}\n665\t\n666\t/// GET /_miroir/shards — shard → node mapping table.\n667\tpub async fn get_shards(State(state): State) -> Result, StatusCode>\n668\twhere\n669\t S: Clone + Send + Sync + 'static,\n670\t AppState: FromRef,\n671\t{\n672\t let state = AppState::from_ref(&state);\n673\t let topo = state.topology.read().await;\n674\t let mut shards = HashMap::new();\n675\t\n676\t // Build shard -> node mapping using rendezvous hash\n677\t for shard_id in 0..topo.shards {\n678\t let mut node_ids = Vec::new();\n679\t\n680\t // Collect nodes from all replica groups for this shard\n681\t for group in topo.groups() {\n682\t let assigned = router::assign_shard_in_group(shard_id, group.nodes(), topo.rf());\n683\t for node_id in assigned {\n684\t node_ids.push(node_id.as_str().to_string());\n685\t }\n686\t }\n687\t\n688\t shards.insert(shard_id.to_string(), node_ids);\n689\t }\n690\t\n691\t Ok(Json(ShardsResponse { shards }))\n692\t}\n693\t\n694\t/// GET /_miroir/ready — readiness probe (503 during startup, 200 once ready).\n695\tpub async fn get_ready(State(state): State) -> Result<&'static str, StatusCode>\n696\twhere\n697\t S: Clone + Send + Sync + 'static,\n698\t AppState: FromRef,\n699\t{\n700\t let state = AppState::from_ref(&state);\n701\t let ready = *state.ready.read().await;\n702\t\n703\t if ready {\n704\t Ok(\"\")\n705\t } else {\n706\t // Not yet marked ready - check if covering quorum exists\n707\t let has_quorum = state.check_covering_quorum().await;\n708\t if has_quorum {\n709\t // Auto-mark ready on first successful quorum check\n710\t state.mark_ready().await;\n711\t Ok(\"\")\n712\t } else {\n713\t Err(StatusCode::SERVICE_UNAVAILABLE)\n714\t }\n715\t }\n716\t}\n717\t\n718\t/// GET /_miroir/metrics — admin-key-gated Prometheus metrics.\n719\tpub async fn get_metrics(State(state): State) -> Response\n720\twhere\n721\t S: Clone + Send + Sync + 'static,\n722\t AppState: FromRef,\n723\t{\n724\t let state = AppState::from_ref(&state);\n725\t match state.metrics.encode_metrics() {\n726\t Ok(metrics) => metrics.into_response(),\n727\t Err(e) => {\n728\t tracing::error!(error = %e, \"failed to encode metrics\");\n729\t StatusCode::INTERNAL_SERVER_ERROR.into_response()\n730\t }\n731\t }\n732\t}\n733\t\n734\t/// POST /_miroir/ui/search/{index}/rotate-scoped-key — manual rotation trigger.\n735\t///\n736\t/// Admin-gated endpoint that initiates a scoped key rotation for the given index.\n737\t/// Set `force: true` in the request body to bypass the timing gate.\n738\tpub async fn rotate_scoped_key_handler(\n739\t State(state): State,\n740\t Path(index): Path,\n741\t Json(body): Json,\n742\t) -> Result, (StatusCode, String)>\n743\twhere\n744\t S: Clone + Send + Sync + 'static,\n745\t AppState: FromRef,\n746\t{\n747\t let app_state = AppState::from_ref(&state);\n748\t\n749\t let redis = app_state.redis_store.clone().ok_or_else(|| {\n750\t (\n751\t StatusCode::PRECONDITION_FAILED,\n752\t \"scoped key rotation requires Redis task store\".into(),\n753\t )\n754\t })?;\n755\t\n756\t if !app_state.config.search_ui.enabled {\n757\t return Err((\n758\t StatusCode::PRECONDITION_FAILED,\n759\t \"search_ui is not enabled\".into(),\n760\t ));\n761\t }\n762\t\n763\t let rotation_state = ScopedKeyRotationState {\n764\t config: app_state.config.clone(),\n765\t redis,\n766\t pod_id: app_state.pod_id.clone(),\n767\t };\n768\t\n769\t info!(\n770\t index = %index,\n771\t force = body.force,\n772\t pod_id = %app_state.pod_id,\n773\t \"manual scoped key rotation triggered\"\n774\t );\n775\t\n776\t match scoped_key_rotation::check_and_rotate(&rotation_state, &index, body.force).await {\n777\t Ok(response) => Ok(Json(response)),\n778\t Err(e) => {\n779\t error!(index = %index, error = %e, \"manual scoped key rotation failed\");\n780\t Err((StatusCode::INTERNAL_SERVER_ERROR, e))\n781\t }\n782\t }\n783\t}\n784\t\n785\t/// Parse a rate limit string like \"10/minute\" into (limit, window_seconds).\n786\tpub fn parse_rate_limit(s: &str) -> Result<(u64, u64), String> {\n787\t let parts: Vec<&str> = s.split('/').collect();\n788\t if parts.len() != 2 {\n789\t return Err(format!(\"invalid rate limit format: '{}', expected 'N/UNIT'\", s));\n790\t }\n791\t let limit: u64 = parts[0].parse()\n792\t .map_err(|_| format!(\"invalid limit number: '{}'\", parts[0]))?;\n793\t let window_seconds = match parts[1] {\n794\t \"second\" | \"s\" => 1,\n795\t \"minute\" | \"m\" => 60,\n796\t \"hour\" | \"h\" => 3600,\n797\t \"day\" | \"d\" => 86400,\n798\t unit => return Err(format!(\"invalid time unit: '{}', expected second/minute/hour/day\", unit)),\n799\t };\n800\t Ok((limit, window_seconds))\n801\t}\n802\t\n803\t/// Generate a random session ID.\n804\tfn generate_session_id() -> String {\n805\t let mut bytes = [0u8; 24];\n806\t rand::rngs::OsRng.fill_bytes(&mut bytes);\n807\t hex::encode(&bytes)\n808\t}\n809\t\n810\t/// POST /_miroir/admin/login — admin login with rate limiting and exponential backoff.\n811\t///\n812\t/// Request body:\n813\t/// ```json\n814\t/// { \"admin_key\": \"...\" }\n815\t/// ```\n816\t///\n817\t/// On success, sets a `miroir_admin_session` cookie and returns:\n818\t/// ```json\n819\t/// { \"success\": true }\n820\t/// ```\n821\t///\n822\t/// Rate limiting (per source IP):\n823\t/// - 10 requests per minute (configurable via `admin_ui.rate_limit.per_ip`)\n824\t/// - After 5 consecutive failed attempts, exponential backoff applies:\n825\t/// - 10m, 20m, 40m, ... up to 24h cap\n826\t///\n827\t/// Successful login resets both the rate limit counter and backoff state.\n828\tpub async fn admin_login(\n829\t State(state): State,\n830\t headers: HeaderMap,\n831\t Json(body): Json,\n832\t) -> Response\n833\twhere\n834\t S: Clone + Send + Sync + 'static,\n835\t AppState: FromRef,\n836\t{\n837\t let state = AppState::from_ref(&state);\n838\t\n839\t // Extract source IP from X-Forwarded-For or X-Real-IP (trust proxy)\n840\t let source_ip = headers\n841\t .get(\"x-forwarded-for\")\n842\t .and_then(|v| v.to_str().ok())\n843\t .and_then(|s| s.split(',').next())\n844\t .or_else(|| headers.get(\"x-real-ip\").and_then(|v| v.to_str().ok()))\n845\t .unwrap_or(\"unknown\")\n846\t .trim()\n847\t .to_string();\n848\t\n849\t // Parse rate limit config\n850\t let (limit, window_seconds) = match parse_rate_limit(&state.config.admin_ui.rate_limit.per_ip) {\n851\t Ok(parsed) => parsed,\n852\t Err(e) => {\n853\t error!(error = %e, \"invalid admin_ui.rate_limit.per_ip config\");\n854\t return (\n855\t StatusCode::INTERNAL_SERVER_ERROR,\n856\t Json(AdminLoginResponse {\n857\t success: false,\n858\t message: Some(\"Rate limit configuration error\".into()),\n859\t }),\n860\t ).into_response();\n861\t }\n862\t };\n863\t\n864\t // Check rate limit and backoff\n865\t let backend = state.config.admin_ui.rate_limit.backend.as_str();\n866\t if backend == \"redis\" {\n867\t if let Some(ref redis) = state.redis_store {\n868\t match redis.check_rate_limit_admin_login(&source_ip, limit, window_seconds) {\n869\t Ok((allowed, wait_seconds)) => {\n870\t if !allowed {\n871\t if let Some(ws) = wait_seconds {\n872\t warn!(\n873\t source_ip_hash = hash_for_log(&source_ip),\n874\t wait_seconds = ws,\n875\t \"admin login rate limited (backoff)\"\n876\t );\n877\t return (\n878\t StatusCode::TOO_MANY_REQUESTS,\n879\t Json(AdminLoginResponse {\n880\t success: false,\n881\t message: Some(format!(\n882\t \"Too many failed login attempts. Try again in {} seconds.\",\n883\t ws\n884\t )),\n885\t }),\n886\t ).into_response();\n887\t } else {\n888\t return (\n889\t StatusCode::TOO_MANY_REQUESTS,\n890\t Json(AdminLoginResponse {\n891\t success: false,\n892\t message: Some(\"Too many login attempts. Please try again later.\".into()),\n893\t }),\n894\t ).into_response();\n895\t }\n896\t }\n897\t // Allowed, proceed\n898\t }\n899\t Err(e) => {\n900\t error!(error = %e, \"failed to check admin login rate limit\");\n901\t // Continue anyway on error (fail-open)\n902\t }\n903\t }\n904\t }\n905\t } else if backend == \"local\" {\n906\t // Local backend rate limiting\n907\t let (allowed, wait_seconds) = state.local_rate_limiter.check(\n908\t &source_ip,\n909\t limit,\n910\t window_seconds * 1000,\n911\t state.config.admin_ui.rate_limit.failed_attempt_threshold,\n912\t state.config.admin_ui.rate_limit.backoff_start_minutes,\n913\t state.config.admin_ui.rate_limit.backoff_max_hours * 60,\n914\t );\n915\t if !allowed {\n916\t warn!(\n917\t source_ip_hash = hash_for_log(&source_ip),\n918\t wait_seconds = ?wait_seconds,\n919\t \"admin login rate limited (local backend)\"\n920\t );\n921\t return (\n922\t StatusCode::TOO_MANY_REQUESTS,\n923\t Json(AdminLoginResponse {\n924\t success: false,\n925\t message: if let Some(ws) = wait_seconds {\n926\t Some(format!(\n927\t \"Too many failed login attempts. Try again in {} seconds.\",\n928\t ws\n929\t ))\n930\t } else {\n931\t Some(\"Too many login attempts. Please try again later.\".into())\n932\t },\n933\t }),\n934\t ).into_response();\n935\t }\n936\t }\n937\t\n938\t // Verify admin_key (constant-time comparison to prevent timing side-channels)\n939\t use subtle::ConstantTimeEq as _;\n940\t if body.admin_key.as_bytes().ct_eq(state.config.admin.api_key.as_bytes()).into() {\n941\t // Successful login - reset rate limit counters\n942\t if backend == \"redis\" {\n943\t if let Some(ref redis) = state.redis_store {\n944\t if let Err(e) = redis.reset_rate_limit_admin_login(&source_ip) {\n945\t warn!(error = %e, \"failed to reset admin login rate limit\");\n946\t }\n947\t }\n948\t } else if backend == \"local\" {\n949\t state.local_rate_limiter.reset(&source_ip);\n950\t }\n951\t\n952\t // Generate session ID and seal it\n953\t let session_id = generate_session_id();\n954\t let sealed = match seal_session(&session_id, &state.seal_key) {\n955\t Ok(sealed) => sealed,\n956\t Err(e) => {\n957\t error!(error = %e, \"failed to seal admin session\");\n958\t return (\n959\t StatusCode::INTERNAL_SERVER_ERROR,\n960\t Json(AdminLoginResponse {\n961\t success: false,\n962\t message: Some(\"Failed to create session\".into()),\n963\t }),\n964\t ).into_response();\n965\t }\n966\t };\n967\t\n968\t info!(\n969\t source_ip_hash = hash_for_log(&source_ip),\n970\t session_prefix = &session_id[..8],\n971\t \"admin login successful\"\n972\t );\n973\t\n974\t // Set cookie and return success\n975\t (\n976\t StatusCode::OK,\n977\t [\n978\t (\"Set-Cookie\", format!(\"{}={}; HttpOnly; Secure; SameSite=Strict; Path=/; Max-Age={}\",\n979\t COOKIE_NAME, sealed, state.config.admin_ui.session_ttl_s)),\n980\t ],\n981\t Json(AdminLoginResponse {\n982\t success: true,\n983\t message: None,\n984\t }),\n985\t ).into_response()\n986\t } else {\n987\t // Wrong admin_key - record failure for backoff tracking\n988\t warn!(\n989\t source_ip_hash = hash_for_log(&source_ip),\n990\t \"admin login failed: invalid admin_key\"\n991\t );\n992\t\n993\t if backend == \"redis\" {\n994\t if let Some(ref redis) = state.redis_store {\n995\t let backoff_start_minutes = state.config.admin_ui.rate_limit.backoff_start_minutes;\n996\t let backoff_max_hours = state.config.admin_ui.rate_limit.backoff_max_hours;\n997\t let failed_threshold = state.config.admin_ui.rate_limit.failed_attempt_threshold;\n998\t\n999\t if let Err(e) = redis.record_failure_admin_login(\n1000\t &source_ip,\n1001\t failed_threshold,\n1002\t backoff_start_minutes,\n1003\t backoff_max_hours,\n1004\t ) {\n1005\t warn!(error = %e, \"failed to record admin login failure\");\n1006\t }\n1007\t }\n1008\t } else if backend == \"local\" {\n1009\t let backoff_start_minutes = state.config.admin_ui.rate_limit.backoff_start_minutes;\n1010\t let backoff_max_hours = state.config.admin_ui.rate_limit.backoff_max_hours;\n1011\t let failed_threshold = state.config.admin_ui.rate_limit.failed_attempt_threshold;\n1012\t\n1013\t state.local_rate_limiter.record_failure(\n1014\t &source_ip,\n1015\t failed_threshold,\n1016\t backoff_start_minutes,\n1017\t backoff_max_hours * 60,\n1018\t );\n1019\t }\n1020\t\n1021\t (\n1022\t StatusCode::UNAUTHORIZED,\n1023\t Json(AdminLoginResponse {\n1024\t success: false,\n1025\t message: Some(\"Invalid admin key\".into()),\n1026\t }),\n1027\t ).into_response()\n1028\t }\n1029\t}\n1030\t\n1031\t// ---------------------------------------------------------------------------\n1032\t// Rebalancer Admin API Endpoints (plan §4)\n1033\t// ---------------------------------------------------------------------------\n1034\t\n1035\t/// POST /_miroir/nodes — Add a node to a replica group.\n1036\t///\n1037\t/// Request body:\n1038\t/// ```json\n1039\t/// {\n1040\t/// \"id\": \"node-new\",\n1041\t/// \"address\": \"http://node-new:7700\",\n1042\t/// \"replica_group\": 0\n1043\t/// }\n1044\t/// ```\n1045\t///\n1046\t/// Implements plan §2 \"Adding a node to an existing group\":\n1047\t/// 1. Add node to topology in `Joining` state\n1048\t/// 2. Send `NodeAdded` event to rebalancer worker\n1049\t/// 3. Worker computes affected shards and starts migration with leader lease\n1050\tpub async fn add_node(\n1051\t State(state): State,\n1052\t Json(body): Json,\n1053\t) -> Result, (StatusCode, String)>\n1054\twhere\n1055\t S: Clone + Send + Sync + 'static,\n1056\t AppState: FromRef,\n1057\t{\n1058\t let app_state = AppState::from_ref(&state);\n1059\t\n1060\t let id = body.get(\"id\")\n1061\t .and_then(|v| v.as_str())\n1062\t .ok_or_else(|| (StatusCode::BAD_REQUEST, \"Missing 'id' field\".into()))?\n1063\t .to_string();\n1064\t\n1065\t let address = body.get(\"address\")\n1066\t .and_then(|v| v.as_str())\n1067\t .ok_or_else(|| (StatusCode::BAD_REQUEST, \"Missing 'address' field\".into()))?\n1068\t .to_string();\n1069\t\n1070\t let replica_group = body.get(\"replica_group\")\n1071\t .and_then(|v| v.as_u64())\n1072\t .ok_or_else(|| (StatusCode::BAD_REQUEST, \"Missing 'replica_group' field\".into()))?\n1073\t as u32;\n1074\t\n1075\t // Add node to topology\n1076\t {\n1077\t let mut topo = app_state.topology.write().await;\n1078\t // Check if node already exists\n1079\t let node_id = NodeId::new(id.clone());\n1080\t if topo.node(&node_id).is_some() {\n1081\t return Err((StatusCode::BAD_REQUEST,\n1082\t format!(\"Node {} already exists\", id)));\n1083\t }\n1084\t // Check if replica group exists\n1085\t let group_count = topo.groups().count() as u32;\n1086\t if replica_group >= group_count {\n1087\t return Err((StatusCode::BAD_REQUEST,\n1088\t format!(\"Replica group {} does not exist\", replica_group)));\n1089\t }\n1090\t let node = Node::new(node_id, address, replica_group);\n1091\t topo.add_node(node);\n1092\t }\n1093\t\n1094\t // Send event to rebalancer worker (if available)\n1095\t if let Some(ref worker) = app_state.rebalancer_worker {\n1096\t let event = TopologyChangeEvent::NodeAdded {\n1097\t node_id: id.clone(),\n1098\t replica_group,\n1099\t index_uid: \"default\".to_string(),\n1100\t };\n1101\t if let Err(e) = worker.event_sender().try_send(event) {\n1102\t error!(error = %e, node_id = %id, \"failed to send NodeAdded event to rebalancer worker\");\n1103\t return Err((StatusCode::INTERNAL_SERVER_ERROR,\n1104\t format!(\"Failed to queue rebalancing: {}\", e)));\n1105\t }\n1106\t }\n1107\t\n1108\t info!(node_id = %id, replica_group, \"Node addition queued for rebalancing\");\n1109\t Ok(Json(serde_json::json!({\n1110\t \"node_id\": id,\n1111\t \"replica_group\": replica_group,\n1112\t \"message\": format!(\"Node {} added to replica group {}, rebalancing will start shortly\", id, replica_group),\n1113\t })))\n1114\t}\n1115\t\n1116\t/// DELETE /_miroir/nodes/{id} — Remove a node from the cluster.\n1117\t///\n1118\t/// Request body (optional):\n1119\t/// ```json\n1120\t/// {\n1121\t/// \"force\": false // Set to true to bypass draining check\n1122\t/// }\n1123\t/// ```\n1124\t///\n1125\t/// Requires the node to be in `draining` state unless `force=true`.\n1126\t/// Note: This only removes the node from topology. Draining must be completed first.\n1127\tpub async fn remove_node(\n1128\t State(state): State,\n1129\t Path(node_id): Path,\n1130\t Json(body): Json,\n1131\t) -> Result, (StatusCode, String)>\n1132\twhere\n1133\t S: Clone + Send + Sync + 'static,\n1134\t AppState: FromRef,\n1135\t{\n1136\t let app_state = AppState::from_ref(&state);\n1137\t\n1138\t let force = body.get(\"force\")\n1139\t .and_then(|v| v.as_bool())\n1140\t .unwrap_or(false);\n1141\t\n1142\t let node_id_obj = NodeId::new(node_id.clone());\n1143\t\n1144\t // Check node state\n1145\t let node_status = {\n1146\t let topo = app_state.topology.read().await;\n1147\t let node = topo.node(&node_id_obj)\n1148\t .ok_or_else(|| (StatusCode::NOT_FOUND, format!(\"Node {} not found\", node_id)))?;\n1149\t\n1150\t // Check if this is the last node in the group\n1151\t let group = topo.groups()\n1152\t .find(|g| g.id == node.replica_group)\n1153\t .ok_or_else(|| (StatusCode::INTERNAL_SERVER_ERROR, format!(\"Replica group {} not found\", node.replica_group)))?;\n1154\t\n1155\t if group.nodes().len() <= 1 {\n1156\t return Err((StatusCode::BAD_REQUEST, \"Cannot remove the last node in a replica group\".into()));\n1157\t }\n1158\t\n1159\t node.status\n1160\t };\n1161\t\n1162\t if !force && node_status != miroir_core::topology::NodeStatus::Draining {\n1163\t return Err((StatusCode::BAD_REQUEST, format!(\n1164\t \"Node {} is not in draining state (current: {:?}), use force=true to bypass\",\n1165\t node_id, node_status\n1166\t ).into()));\n1167\t }\n1168\t\n1169\t // Remove node from topology\n1170\t {\n1171\t let mut topo = app_state.topology.write().await;\n1172\t topo.remove_node(&node_id_obj);\n1173\t }\n1174\t\n1175\t info!(node_id = %node_id, force, \"Node removal completed\");\n1176\t Ok(Json(serde_json::json!({\n1177\t \"node_id\": node_id,\n1178\t \"message\": format!(\"Node {} removed from cluster\", node_id),\n1179\t })))\n1180\t}\n1181\t\n1182\t/// POST /_miroir/nodes/{id}/drain — Drain a node (prepare for removal).\n1183\t///\n1184\t/// Implements plan §2 node drain flow:\n1185\t/// 1. Mark node as `draining`\n1186\t/// 2. Send `NodeDraining` event to rebalancer worker\n1187\t/// 3. Worker computes shard destinations and starts migration with leader lease\n1188\tpub async fn drain_node(\n1189\t State(state): State,\n1190\t Path(node_id): Path,\n1191\t) -> Result, (StatusCode, String)>\n1192\twhere\n1193\t S: Clone + Send + Sync + 'static,\n1194\t AppState: FromRef,\n1195\t{\n1196\t let app_state = AppState::from_ref(&state);\n1197\t\n1198\t // Check if worker is available\n1199\t let worker = app_state.rebalancer_worker.as_ref()\n1200\t .ok_or_else(|| (StatusCode::SERVICE_UNAVAILABLE, \"Rebalancer worker not initialized\".into()))?;\n1201\t\n1202\t // Get node info and mark as draining\n1203\t let replica_group = {\n1204\t let mut topo = app_state.topology.write().await;\n1205\t let node_id_obj = NodeId::new(node_id.clone());\n1206\t let node = topo.node(&node_id_obj)\n1207\t .ok_or_else(|| (StatusCode::NOT_FOUND, format!(\"Node {} not found\", node_id)))?;\n1208\t\n1209\t // Check if this is the last node in the group\n1210\t let group = topo.groups()\n1211\t .find(|g| g.id == node.replica_group)\n1212\t .ok_or_else(|| (StatusCode::INTERNAL_SERVER_ERROR, format!(\"Replica group {} not found\", node.replica_group)))?;\n1213\t\n1214\t if group.nodes().len() <= 1 {\n1215\t return Err((StatusCode::BAD_REQUEST, \"Cannot remove the last node in a replica group\".into()));\n1216\t }\n1217\t\n1218\t let replica_group = node.replica_group;\n1219\t\n1220\t // Mark node as draining\n1221\t if let Some(n) = topo.node_mut(&node_id_obj) {\n1222\t n.status = miroir_core::topology::NodeStatus::Draining;\n1223\t }\n1224\t\n1225\t replica_group\n1226\t };\n1227\t\n1228\t // Send event to rebalancer worker\n1229\t let event = TopologyChangeEvent::NodeDraining {\n1230\t node_id: node_id.clone(),\n1231\t replica_group,\n1232\t index_uid: \"default\".to_string(),\n1233\t };\n1234\t\n1235\t if let Err(e) = worker.event_sender().try_send(event) {\n1236\t error!(error = %e, node_id = %node_id, \"failed to send NodeDraining event to rebalancer worker\");\n1237\t return Err((StatusCode::INTERNAL_SERVER_ERROR, format!(\"Failed to queue drain: {}\", e)));\n1238\t }\n1239\t\n1240\t info!(node_id = %node_id, replica_group, \"Node drain queued for rebalancing\");\n1241\t Ok(Json(serde_json::json!({\n1242\t \"node_id\": node_id,\n1243\t \"replica_group\": replica_group,\n1244\t \"message\": format!(\"Node {} is draining, migrations will start shortly\", node_id),\n1245\t })))\n1246\t}\n1247\t\n1248\t/// POST /_miroir/nodes/{id}/fail — Mark a node as failed.\n1249\t///\n1250\t/// Marks a node as failed and sends a `NodeFailed` event to the rebalancer worker.\n1251\tpub async fn fail_node(\n1252\t State(state): State,\n1253\t Path(node_id): Path,\n1254\t) -> Result, (StatusCode, String)>\n1255\twhere\n1256\t S: Clone + Send + Sync + 'static,\n1257\t AppState: FromRef,\n1258\t{\n1259\t let app_state = AppState::from_ref(&state);\n1260\t\n1261\t // Check if worker is available\n1262\t let worker = app_state.rebalancer_worker.as_ref()\n1263\t .ok_or_else(|| (StatusCode::SERVICE_UNAVAILABLE, \"Rebalancer worker not initialized\".into()))?;\n1264\t\n1265\t // Get node info and mark as failed\n1266\t let replica_group = {\n1267\t let mut topo = app_state.topology.write().await;\n1268\t let node_id_obj = NodeId::new(node_id.clone());\n1269\t let node = topo.node(&node_id_obj)\n1270\t .ok_or_else(|| (StatusCode::NOT_FOUND, format!(\"Node {} not found\", node_id)))?;\n1271\t\n1272\t let replica_group = node.replica_group;\n1273\t\n1274\t // Mark node as failed\n1275\t if let Some(n) = topo.node_mut(&node_id_obj) {\n1276\t n.status = miroir_core::topology::NodeStatus::Failed;\n1277\t }\n1278\t\n1279\t replica_group\n1280\t };\n1281\t\n1282\t // Send event to rebalancer worker\n1283\t let event = TopologyChangeEvent::NodeFailed {\n1284\t node_id: node_id.clone(),\n1285\t replica_group,\n1286\t index_uid: \"default\".to_string(),\n1287\t };\n1288\t\n1289\t if let Err(e) = worker.event_sender().try_send(event) {\n1290\t error!(error = %e, node_id = %node_id, \"failed to send NodeFailed event to rebalancer worker\");\n1291\t return Err((StatusCode::INTERNAL_SERVER_ERROR, format!(\"Failed to queue node failure: {}\", e)));\n1292\t }\n1293\t\n1294\t info!(node_id = %node_id, replica_group, \"Node failure queued for handling\");\n1295\t Ok(Json(serde_json::json!({\n1296\t \"node_id\": node_id,\n1297\t \"replica_group\": replica_group,\n1298\t \"message\": format!(\"Node {} marked as failed\", node_id),\n1299\t })))\n1300\t}\n1301\t\n1302\t/// POST /_miroir/nodes/{id}/recover — Mark a failed node as recovered.\n1303\t///\n1304\t/// Marks a failed node as recovered and sends a `NodeRecovered` event to the rebalancer worker.\n1305\tpub async fn recover_node(\n1306\t State(state): State,\n1307\t Path(node_id): Path,\n1308\t) -> Result, (StatusCode, String)>\n1309\twhere\n1310\t S: Clone + Send + Sync + 'static,\n1311\t AppState: FromRef,\n1312\t{\n1313\t let app_state = AppState::from_ref(&state);\n1314\t\n1315\t // Check if worker is available\n1316\t let worker = app_state.rebalancer_worker.as_ref()\n1317\t .ok_or_else(|| (StatusCode::SERVICE_UNAVAILABLE, \"Rebalancer worker not initialized\".into()))?;\n1318\t\n1319\t // Get node info and mark as recovered\n1320\t let replica_group = {\n1321\t let mut topo = app_state.topology.write().await;\n1322\t let node_id_obj = NodeId::new(node_id.clone());\n1323\t let node = topo.node(&node_id_obj)\n1324\t .ok_or_else(|| (StatusCode::NOT_FOUND, format!(\"Node {} not found\", node_id)))?;\n1325\t\n1326\t let replica_group = node.replica_group;\n1327\t\n1328\t // Mark node as active (recovered)\n1329\t if let Some(n) = topo.node_mut(&node_id_obj) {\n1330\t n.status = miroir_core::topology::NodeStatus::Active;\n1331\t }\n1332\t\n1333\t replica_group\n1334\t };\n1335\t\n1336\t // Send event to rebalancer worker\n1337\t let event = TopologyChangeEvent::NodeRecovered {\n1338\t node_id: node_id.clone(),\n1339\t replica_group,\n1340\t index_uid: \"default\".to_string(),\n1341\t };\n1342\t\n1343\t if let Err(e) = worker.event_sender().try_send(event) {\n1344\t error!(error = %e, node_id = %node_id, \"failed to send NodeRecovered event to rebalancer worker\");\n1345\t return Err((StatusCode::INTERNAL_SERVER_ERROR, format!(\"Failed to queue node recovery: {}\", e)));\n1346\t }\n1347\t\n1348\t info!(node_id = %node_id, replica_group, \"Node recovery queued for handling\");\n1349\t Ok(Json(serde_json::json!({\n1350\t \"node_id\": node_id,\n1351\t \"replica_group\": replica_group,\n1352\t \"message\": format!(\"Node {} marked as recovered\", node_id),\n1353\t })))\n1354\t}\n1355\t\n1356\t/// GET /_miroir/rebalance/status — Get current rebalance status.\n1357\tpub async fn get_rebalance_status(\n1358\t State(state): State,\n1359\t) -> Result, (StatusCode, String)>\n1360\twhere\n1361\t S: Clone + Send + Sync + 'static,\n1362\t AppState: FromRef,\n1363\t{\n1364\t let app_state = AppState::from_ref(&state);\n1365\t\n1366\t // Get rebalancer status if available\n1367\t let rebalancer_status = if let Some(ref rebalancer) = app_state.rebalancer {\n1368\t let status = rebalancer.status().await;\n1369\t let metrics = rebalancer.metrics.read().await;\n1370\t Some(serde_json::json!({\n1371\t \"in_progress\": status.in_progress,\n1372\t \"operations\": status.operations,\n1373\t \"migrations\": status.migrations,\n1374\t \"metrics\": {\n1375\t \"documents_migrated_total\": metrics.documents_migrated_total,\n1376\t \"active_migrations\": metrics.active_migrations,\n1377\t \"current_duration_secs\": metrics.current_duration_secs(),\n1378\t },\n1379\t }))\n1380\t } else {\n1381\t None\n1382\t };\n1383\t\n1384\t // Get worker status if available\n1385\t let worker_status = if let Some(ref worker) = app_state.rebalancer_worker {\n1386\t Some(worker.get_status().await)\n1387\t } else {\n1388\t None\n1389\t };\n1390\t\n1391\t Ok(Json(serde_json::json!({\n1392\t \"rebalancer\": rebalancer_status,\n1393\t \"worker\": worker_status,\n1394\t })))\n1395\t}\n1396\t\n1397\t/// POST /_miroir/replica_groups — Add a replica group.\n1398\t///\n1399\t/// Request body:\n1400\t/// ```json\n1401\t/// {\n1402\t/// \"group_id\": 2,\n1403\t/// \"nodes\": [\n1404\t/// {\"id\": \"node-6\", \"address\": \"http://node-6:7700\"},\n1405\t/// {\"id\": \"node-7\", \"address\": \"http://node-7:7700\"}\n1406\t/// ]\n1407\t/// }\n1408\t/// ```\n1409\tpub async fn add_replica_group(\n1410\t State(state): State,\n1411\t Json(body): Json,\n1412\t) -> Result, (StatusCode, String)>\n1413\twhere\n1414\t S: Clone + Send + Sync + 'static,\n1415\t AppState: FromRef,\n1416\t{\n1417\t let app_state = AppState::from_ref(&state);\n1418\t\n1419\t let rebalancer = app_state.rebalancer.as_ref()\n1420\t .ok_or_else(|| (StatusCode::SERVICE_UNAVAILABLE, \"Rebalancer not initialized\".into()))?;\n1421\t\n1422\t let group_id = body.get(\"group_id\")\n1423\t .and_then(|v| v.as_u64())\n1424\t .ok_or_else(|| (StatusCode::BAD_REQUEST, \"Missing 'group_id' field\".into()))?\n1425\t as u32;\n1426\t\n1427\t let nodes_array = body.get(\"nodes\")\n1428\t .and_then(|v| v.as_array())\n1429\t .ok_or_else(|| (StatusCode::BAD_REQUEST, \"Missing 'nodes' field\".into()))?;\n1430\t\n1431\t let mut nodes = Vec::new();\n1432\t for node_obj in nodes_array {\n1433\t let id = node_obj.get(\"id\")\n1434\t .and_then(|v| v.as_str())\n1435\t .ok_or_else(|| (StatusCode::BAD_REQUEST, \"Missing node 'id'\".into()))?\n1436\t .to_string();\n1437\t\n1438\t let address = node_obj.get(\"address\")\n1439\t .and_then(|v| v.as_str())\n1440\t .ok_or_else(|| (StatusCode::BAD_REQUEST, \"Missing node 'address'\".into()))?\n1441\t .to_string();\n1442\t\n1443\t use miroir_core::rebalancer::GroupNodeSpec;\n1444\t nodes.push(GroupNodeSpec { id, address });\n1445\t }\n1446\t\n1447\t use miroir_core::rebalancer::AddReplicaGroupRequest;\n1448\t let request = AddReplicaGroupRequest { group_id, nodes };\n1449\t\n1450\t match rebalancer.add_replica_group(request).await {\n1451\t Ok(result) => {\n1452\t info!(group_id, \"Replica group addition completed\");\n1453\t Ok(Json(serde_json::json!({\n1454\t \"operation_id\": result.id,\n1455\t \"message\": result.message,\n1456\t })))\n1457\t }\n1458\t Err(e) => {\n1459\t error!(error = %e, group_id, \"Replica group addition failed\");\n1460\t Err((StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))\n1461\t }\n1462\t }\n1463\t}\n1464\t\n1465\t/// DELETE /_miroir/replica_groups/{id} — Remove a replica group.\n1466\tpub async fn remove_replica_group(\n1467\t State(state): State,\n1468\t Path(group_id): Path,\n1469\t Json(body): Json,\n1470\t) -> Result, (StatusCode, String)>\n1471\twhere\n1472\t S: Clone + Send + Sync + 'static,\n1473\t AppState: FromRef,\n1474\t{\n1475\t let app_state = AppState::from_ref(&state);\n1476\t\n1477\t let rebalancer = app_state.rebalancer.as_ref()\n1478\t .ok_or_else(|| (StatusCode::SERVICE_UNAVAILABLE, \"Rebalancer not initialized\".into()))?;\n1479\t\n1480\t let force = body.get(\"force\")\n1481\t .and_then(|v| v.as_bool())\n1482\t .unwrap_or(false);\n1483\t\n1484\t use miroir_core::rebalancer::RemoveReplicaGroupRequest;\n1485\t let request = RemoveReplicaGroupRequest { group_id, force };\n1486\t\n1487\t match rebalancer.remove_replica_group(request).await {\n1488\t Ok(result) => {\n1489\t info!(group_id, \"Replica group removal completed\");\n1490\t Ok(Json(serde_json::json!({\n1491\t \"operation_id\": result.id,\n1492\t \"message\": result.message,\n1493\t })))\n1494\t }\n1495\t Err(e) => {\n1496\t error!(error = %e, group_id, \"Replica group removal failed\");\n1497\t Err((StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))\n1498\t }\n1499\t }\n1500\t}\n1501\t\n1502\t#[cfg(test)]\n1503\tmod tests {\n1504\t use super::*;\n1505\t\n1506\t #[test]\n1507\t fn test_topology_response_serialization() {\n1508\t let response = TopologyResponse {\n1509\t shards: 64,\n1510\t replication_factor: 2,\n1511\t nodes: vec![\n1512\t NodeInfo {\n1513\t id: \"meili-0\".to_string(),\n1514\t address: \"http://meili-0.search.svc:7700\".to_string(),\n1515\t status: \"healthy\".to_string(),\n1516\t shard_count: 32,\n1517\t last_seen_ms: 100,\n1518\t error: None,\n1519\t },\n1520\t NodeInfo {\n1521\t id: \"meili-1\".to_string(),\n1522\t address: \"http://meili-1.search.svc:7700\".to_string(),\n1523\t status: \"degraded\".to_string(),\n1524\t shard_count: 32,\n1525\t last_seen_ms: 5000,\n1526\t error: Some(\"connection refused\".to_string()),\n1527\t },\n1528\t ],\n1529\t degraded_node_count: 1,\n1530\t rebalance_in_progress: false,\n1531\t fully_covered: false,\n1532\t };\n1533\t\n1534\t let json = serde_json::to_string(&response).unwrap();\n1535\t assert!(json.contains(\"\\\"shards\\\":64\"));\n1536\t assert!(json.contains(\"\\\"replication_factor\\\":2\"));\n1537\t assert!(json.contains(\"\\\"degraded_node_count\\\":1\"));\n1538\t assert!(json.contains(\"\\\"fully_covered\\\":false\"));\n1539\t assert!(json.contains(\"\\\"status\\\":\\\"healthy\\\"\"));\n1540\t assert!(json.contains(\"\\\"error\\\":\\\"connection refused\\\"\"));\n1541\t }\n1542\t\n1543\t #[test]\n1544\t fn test_shards_response_serialization() {\n1545\t let mut shards = HashMap::new();\n1546\t shards.insert(\"0\".to_string(), vec![\"node-0\".to_string(), \"node-1\".to_string()]);\n1547\t shards.insert(\"1\".to_string(), vec![\"node-1\".to_string(), \"node-0\".to_string()]);\n1548\t\n1549\t let response = ShardsResponse { shards };\n1550\t let json = serde_json::to_string(&response).unwrap();\n1551\t assert!(json.contains(\"\\\"0\\\"\"));\n1552\t assert!(json.contains(\"\\\"node-0\\\"\"));\n1553\t }\n1554\t\n1555\t #[test]\n1556\t fn test_node_info_with_optional_error() {\n1557\t let info = NodeInfo {\n1558\t id: \"test\".to_string(),\n1559\t address: \"http://meili-0.search.svc:7700\".to_string(),\n1560\t status: \"healthy\".to_string(),\n1561\t shard_count: 10,\n1562\t last_seen_ms: 100,\n1563\t error: None,\n1564\t };\n1565\t\n1566\t let json = serde_json::to_string(&info).unwrap();\n1567\t // error field should not be present when None\n1568\t assert!(!json.contains(\"error\"));\n1569\t }\n1570\t\n1571\t #[test]\n1572\t fn test_node_info_with_error() {\n1573\t let info = NodeInfo {\n1574\t id: \"test\".to_string(),\n1575\t address: \"http://meili-0.search.svc:7700\".to_string(),\n1576\t status: \"failed\".to_string(),\n1577\t shard_count: 10,\n1578\t last_seen_ms: 100,\n1579\t error: Some(\"timeout\".to_string()),\n1580\t };\n1581\t\n1582\t let json = serde_json::to_string(&info).unwrap();\n1583\t assert!(json.contains(\"\\\"error\\\":\\\"timeout\\\"\"));\n1584\t }\n1585\t}\n1586\t"}]},"parent_tool_use_id":"call_d8ab3450251e405481f12a94","session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","uuid":"3fd20d85-01e7-45ad-bcc7-30f149087e17","timestamp":"2026-05-23T05:57:18.318Z"} 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Structured logging, request IDs, and Prometheus metrics middleware.\n2\t\n3\tuse std::time::Instant;\n4\t\n5\tuse axum::{\n6\t extract::{Request, State},\n7\t http::{HeaderMap, HeaderValue},\n8\t middleware::Next,\n9\t response::Response,\n10\t Router,\n11\t routing::get,\n12\t};\n13\tuse miroir_core::config::MiroirConfig;\n14\tuse prometheus::{\n15\t Counter, CounterVec, Encoder, Gauge, GaugeVec, Histogram, HistogramOpts, HistogramVec, Opts,\n16\t Registry, TextEncoder,\n17\t};\n18\tuse tracing::info_span;\n19\tuse uuid::Uuid;\n20\tuse hex;\n21\tuse std::collections::hash_map::DefaultHasher;\n22\tuse std::hash::{Hash, Hasher};\n23\t\n24\t/// Request ID wrapper type for storing in axum Request extensions.\n25\t///\n26\t/// This is a newtype wrapper around the 8-character hex request ID,\n27\t/// allowing handlers to extract it via `Request.extensions().get::()`.\n28\t#[derive(Clone, Debug, PartialEq, Eq, Hash)]\n29\tpub struct RequestId(pub String);\n30\t\n31\timpl RequestId {\n32\t /// Create a new RequestId from a UUIDv7.\n33\t ///\n34\t /// Hashes the full UUIDv7 to produce an 8-character hex ID that is unique\n35\t /// even for consecutive calls within the same millisecond.\n36\t pub fn new() -> Self {\n37\t let uuid = Uuid::now_v7();\n38\t let bytes = uuid.as_bytes();\n39\t // Hash the full UUID to ensure uniqueness even within the same millisecond\n40\t let mut hasher = DefaultHasher::new();\n41\t hasher.write(bytes);\n42\t let hash = hasher.finish();\n43\t // Take first 8 hex chars of 64-bit hash (32 bits is sufficient entropy)\n44\t Self(format!(\"{:08x}\", hash as u32))\n45\t }\n46\t\n47\t /// Get the inner request ID string.\n48\t pub fn as_str(&self) -> &str {\n49\t &self.0\n50\t }\n51\t\n52\t /// Parse a RequestId from a string.\n53\t pub fn parse(s: String) -> Option {\n54\t if s.len() == 8 && s.chars().all(|c| c.is_ascii_hexdigit()) {\n55\t Some(Self(s))\n56\t } else {\n57\t None\n58\t }\n59\t }\n60\t}\n61\t\n62\t/// Session ID wrapper type for read-your-writes session pinning (plan §13.6).\n63\t///\n64\t/// Extracted from the `X-Miroir-Session` header and stored in request extensions.\n65\t/// Handlers can access it via `Request.extensions().get::()`.\n66\t#[derive(Clone, Debug, PartialEq, Eq, Hash)]\n67\tpub struct SessionId(pub String);\n68\t\n69\timpl Default for SessionId {\n70\t fn default() -> Self {\n71\t Self(String::new())\n72\t }\n73\t}\n74\t\n75\timpl SessionId {\n76\t /// Get the inner session ID string.\n77\t pub fn as_str(&self) -> &str {\n78\t &self.0\n79\t }\n80\t\n81\t /// Parse a SessionId from a string.\n82\t ///\n83\t /// Accepts any non-empty string (client-provided UUID or identifier).\n84\t pub fn parse(s: String) -> Option {\n85\t if !s.is_empty() && s.len() <= 256 {\n86\t Some(Self(s))\n87\t } else {\n88\t None\n89\t }\n90\t }\n91\t}\n92\t\n93\tpub async fn request_id_middleware(\n94\t mut req: Request,\n95\t next: Next,\n96\t) -> Response {\n97\t // Check for existing request ID in headers\n98\t let request_id = req\n99\t .headers()\n100\t .get(\"x-request-id\")\n101\t .and_then(|v| v.to_str().ok())\n102\t .and_then(|s| RequestId::parse(s.to_string()))\n103\t .unwrap_or_else(RequestId::new);\n104\t\n105\t // Store in request extensions for handler access\n106\t req.extensions_mut().insert(request_id.clone());\n107\t\n108\t // Set X-Request-Id header on request (for telemetry_middleware to read)\n109\t if let Ok(val) = HeaderValue::from_str(request_id.as_str()) {\n110\t req.headers_mut().insert(\"x-request-id\", val);\n111\t }\n112\t\n113\t // Process the request\n114\t let mut response = next.run(req).await;\n115\t\n116\t // Add X-Request-Id header to response (override if exists)\n117\t if let Ok(val) = HeaderValue::from_str(request_id.as_str()) {\n118\t response.headers_mut().insert(\"x-request-id\", val);\n119\t }\n120\t\n121\t response\n122\t}\n123\t\n124\t/// Session pinning middleware (plan §13.6).\n125\t///\n126\t/// Extracts the `X-Miroir-Session` header and stores it in request extensions\n127\t/// for handlers to access via `Request.extensions().get::()`.\n128\tpub async fn session_pinning_middleware(\n129\t mut req: Request,\n130\t next: Next,\n131\t) -> Response {\n132\t // Extract session ID from header if present\n133\t let session_id = req\n134\t .headers()\n135\t .get(\"x-miroir-session\")\n136\t .and_then(|v| v.to_str().ok())\n137\t .and_then(|s| SessionId::parse(s.to_string()));\n138\t\n139\t // Store in request extensions for handler access\n140\t if let Some(sid) = session_id {\n141\t req.extensions_mut().insert(sid);\n142\t }\n143\t\n144\t next.run(req).await\n145\t}\n146\t\n147\t\n148\t/// Telemetry state combining metrics and pod_id for middleware.\n149\t#[derive(Clone)]\n150\tpub struct TelemetryState {\n151\t pub metrics: Metrics,\n152\t pub pod_id: String,\n153\t}\n154\t\n155\timpl TelemetryState {\n156\t pub fn new(metrics: Metrics) -> Self {\n157\t let pod_id = std::env::var(\"POD_NAME\").unwrap_or_else(|_| \"unknown\".to_string());\n158\t Self { metrics, pod_id }\n159\t }\n160\t}\n161\t\n162\t/// Global metrics registry shared across all middleware instances.\n163\tpub struct Metrics {\n164\t registry: Registry,\n165\t\n166\t // ── Request metrics ──\n167\t request_duration: HistogramVec,\n168\t requests_total: CounterVec,\n169\t requests_in_flight: Gauge,\n170\t\n171\t // ── Node health metrics ──\n172\t node_healthy: GaugeVec,\n173\t node_request_duration: HistogramVec,\n174\t node_errors: CounterVec,\n175\t\n176\t // ── Shard metrics ──\n177\t shard_coverage: Gauge,\n178\t degraded_shards: Gauge,\n179\t shard_distribution: GaugeVec,\n180\t\n181\t // ── Task metrics ──\n182\t task_processing_age: Histogram,\n183\t tasks_total: CounterVec,\n184\t task_registry_size: Gauge,\n185\t\n186\t // ── Scatter-gather metrics ──\n187\t scatter_fan_out_size: Histogram,\n188\t scatter_partial_responses: Counter,\n189\t scatter_retries: Counter,\n190\t\n191\t // ── Rebalancer metrics ──\n192\t rebalance_in_progress: Gauge,\n193\t rebalance_documents_migrated: Counter,\n194\t rebalance_duration: Histogram,\n195\t\n196\t // ── §13.11 Multi-search metrics (feature-gated) ──\n197\t multisearch_queries_per_batch: Option,\n198\t multisearch_batches_total: Option,\n199\t multisearch_partial_failures_total: Option,\n200\t multisearch_tenant_session_pin_override_total: Option,"}]},"parent_tool_use_id":"call_d8ab3450251e405481f12a94","session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","uuid":"45b09197-0356-46eb-80c3-df0e2de3392f","timestamp":"2026-05-23T05:57:30.511Z"} -{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_c246c3f1377e4eeebff055f3","type":"tool_result","content":"Found 32 files\n.beads/issues.jsonl\n.beads/traces/miroir-uhj.7/stdout.txt\n.beads/traces/miroir-m9q.2/stdout.txt\n.beads/traces/miroir-uhj.6/stdout.txt\ncrates/miroir-proxy/src/main.rs\nCargo.lock\n.beads/traces/miroir-uhj.5/stdout.txt\ncrates/miroir-proxy/src/middleware.rs\ncrates/miroir-proxy/src/routes/admin_endpoints.rs\n.beads/traces/miroir-9dj.6/stdout.txt\n.beads/traces/miroir-9dj.7/stdout.txt\ncrates/miroir-proxy/src/auth.rs\ncharts/miroir/values.schema.json\ncharts/miroir/values.yaml\n.beads/traces/miroir-zc2.1/stdout.txt\n.beads/traces/miroir-r3j.3/stdout.txt\ndocs/plan/plan.md\ncrates/miroir-proxy/Cargo.toml\n.beads/traces/miroir-uhj/stdout.txt\nk8s/argocd/miroir-application.yaml\nk8s/argocd/miroir-dev-application.yaml\nnotes/miroir-mkk.1.md\ndashboards/miroir-overview.json\ncharts/miroir/templates/miroir-deployment.yaml\ncharts/miroir/templates/miroir-prometheusrule.yaml\ncharts/miroir/templates/miroir-servicemonitor.yaml\ncharts/miroir/dashboards/miroir-overview.json\n.beads/traces/miroir-r3j.3.4/stdout.txt\n.beads/traces/miroir-afh/stdout.txt\n.beads/traces/miroir-afh.5.3/stdout.txt\n.beads/traces/miroir-afh.5.2/stdout.txt\n.beads/traces/miroir-46p.5/stdout.txt"}]},"parent_tool_use_id":"call_d8ab3450251e405481f12a94","session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","uuid":"d095be87-ef72-4213-89bd-58e9bcba7763","timestamp":"2026-05-23T05:57:30.528Z"} -{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_5e8a5c76c8214f30afca3903","type":"tool_result","content":"/home/coding/miroir/crates/miroir-proxy/src/middleware.rs","is_error":false}]},"parent_tool_use_id":"call_d8ab3450251e405481f12a94","session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","uuid":"ac47b7bf-1259-4354-973e-25654ffb786b","timestamp":"2026-05-23T05:57:30.611Z"} -{"type":"system","subtype":"task_progress","task_id":"aae5896710b97f4d2","tool_use_id":"call_d8ab3450251e405481f12a94","description":"Reading crates/miroir-proxy/src/middleware.rs","usage":{"total_tokens":0,"tool_uses":23,"duration_ms":38495},"last_tool_name":"Read","uuid":"d981a535-9368-4c7b-985b-0c870c1f70a6","session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97"} -{"type":"assistant","message":{"id":"msg_2026052313573371f22d42677b4b48","type":"message","role":"assistant","model":"glm-4.7","content":[{"type":"tool_use","id":"call_695843848c074067859ad528","name":"Read","input":{"file_path":"/home/coding/miroir/crates/miroir-proxy/src/middleware.rs","offset":200,"limit":200}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":"call_d8ab3450251e405481f12a94","session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","uuid":"22b62f6b-b605-48f1-ac0d-f63386b6f181"} -{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_695843848c074067859ad528","type":"tool_result","content":"200\t multisearch_tenant_session_pin_override_total: Option,\n201\t\n202\t // ── §13.12 Vector search metrics (feature-gated) ──\n203\t vector_search_over_fetched_total: Option,\n204\t vector_merge_strategy: Option,\n205\t vector_embedder_drift_total: Option,\n206\t\n207\t // ── §13.13 CDC metrics (feature-gated) ──\n208\t cdc_events_published_total: Option,\n209\t cdc_lag_seconds: Option,\n210\t cdc_buffer_bytes: Option,\n211\t cdc_dropped_total: Option,\n212\t cdc_events_suppressed_total: Option,\n213\t\n214\t // ── §13.14 TTL metrics (feature-gated) ──\n215\t ttl_documents_expired_total: Option,\n216\t ttl_sweep_duration_seconds: Option,\n217\t ttl_pending_estimate: Option,\n218\t\n219\t // ── §13.15 Tenant affinity metrics (feature-gated) ──\n220\t tenant_queries_total: Option,\n221\t tenant_pinned_groups: Option,\n222\t tenant_fallback_total: Option,\n223\t\n224\t // ── §13.16 Shadow traffic metrics (feature-gated) ──\n225\t shadow_diff_total: Option,\n226\t shadow_kendall_tau: Option,\n227\t shadow_latency_delta_seconds: Option,\n228\t shadow_errors_total: Option,\n229\t\n230\t // ── §13.17 ILM metrics (feature-gated) ──\n231\t rollover_events_total: Option,\n232\t rollover_active_indexes: Option,\n233\t rollover_documents_expired_total: Option,\n234\t rollover_last_action_seconds: Option,\n235\t\n236\t // ── §13.18 Canary metrics (feature-gated) ──\n237\t canary_runs_total: Option,\n238\t canary_latency_ms: Option,\n239\t canary_assertion_failures_total: Option,\n240\t\n241\t // ── §13.19 Admin UI metrics (feature-gated) ──\n242\t admin_ui_sessions_total: Option,\n243\t admin_ui_action_total: Option,\n244\t admin_ui_destructive_action_total: Option,\n245\t\n246\t // ── §13.20 Explain metrics (feature-gated) ──\n247\t explain_requests_total: Option,\n248\t explain_warnings_total: Option,\n249\t explain_execute_total: Option,\n250\t\n251\t // ── §13.21 Search UI metrics (feature-gated) ──\n252\t search_ui_sessions_total: Option,\n253\t search_ui_queries_total: Option,\n254\t search_ui_zero_hits_total: Option,\n255\t search_ui_click_through_total: Option,\n256\t search_ui_p95_ms: Option,\n257\t\n258\t // ── §14.9 Resource-pressure metrics (always present) ──\n259\t memory_pressure: Gauge,\n260\t cpu_throttled_seconds_total: Counter,\n261\t request_queue_depth: Gauge,\n262\t background_queue_depth: GaugeVec,\n263\t peer_pod_count: Gauge,\n264\t leader: Gauge,\n265\t owned_shards_count: Gauge,\n266\t\n267\t // ── Admin session sealing metrics (always present) ──\n268\t admin_session_key_generated: Gauge,\n269\t admin_session_revoked_total: Counter,\n270\t\n271\t // ── §13.5 Two-phase settings broadcast metrics (always present) ──\n272\t settings_broadcast_phase: GaugeVec,\n273\t settings_hash_mismatch_total: Counter,\n274\t settings_drift_repair_total: CounterVec,\n275\t settings_version: GaugeVec,\n276\t\n277\t // ── §13.7 Alias metrics (always present) ──\n278\t alias_resolutions_total: CounterVec,\n279\t alias_flips_total: CounterVec,\n280\t\n281\t // ── §13.6 Session pinning metrics (always present) ──\n282\t session_active_count: Gauge,\n283\t session_pin_enforced_total: CounterVec,\n284\t session_wait_duration_seconds: Histogram,\n285\t session_wait_timeout_total: CounterVec,\n286\t}\n287\t\n288\timpl Clone for Metrics {\n289\t fn clone(&self) -> Self {\n290\t Self {\n291\t registry: self.registry.clone(),\n292\t request_duration: self.request_duration.clone(),\n293\t requests_total: self.requests_total.clone(),\n294\t requests_in_flight: self.requests_in_flight.clone(),\n295\t node_healthy: self.node_healthy.clone(),\n296\t node_request_duration: self.node_request_duration.clone(),\n297\t node_errors: self.node_errors.clone(),\n298\t shard_coverage: self.shard_coverage.clone(),\n299\t degraded_shards: self.degraded_shards.clone(),\n300\t shard_distribution: self.shard_distribution.clone(),\n301\t task_processing_age: self.task_processing_age.clone(),\n302\t tasks_total: self.tasks_total.clone(),\n303\t task_registry_size: self.task_registry_size.clone(),\n304\t scatter_fan_out_size: self.scatter_fan_out_size.clone(),\n305\t scatter_partial_responses: self.scatter_partial_responses.clone(),\n306\t scatter_retries: self.scatter_retries.clone(),\n307\t rebalance_in_progress: self.rebalance_in_progress.clone(),\n308\t rebalance_documents_migrated: self.rebalance_documents_migrated.clone(),\n309\t rebalance_duration: self.rebalance_duration.clone(),\n310\t multisearch_queries_per_batch: self.multisearch_queries_per_batch.clone(),\n311\t multisearch_batches_total: self.multisearch_batches_total.clone(),\n312\t multisearch_partial_failures_total: self.multisearch_partial_failures_total.clone(),\n313\t multisearch_tenant_session_pin_override_total: self.multisearch_tenant_session_pin_override_total.clone(),\n314\t vector_search_over_fetched_total: self.vector_search_over_fetched_total.clone(),\n315\t vector_merge_strategy: self.vector_merge_strategy.clone(),\n316\t vector_embedder_drift_total: self.vector_embedder_drift_total.clone(),\n317\t cdc_events_published_total: self.cdc_events_published_total.clone(),\n318\t cdc_lag_seconds: self.cdc_lag_seconds.clone(),\n319\t cdc_buffer_bytes: self.cdc_buffer_bytes.clone(),\n320\t cdc_dropped_total: self.cdc_dropped_total.clone(),\n321\t cdc_events_suppressed_total: self.cdc_events_suppressed_total.clone(),\n322\t ttl_documents_expired_total: self.ttl_documents_expired_total.clone(),\n323\t ttl_sweep_duration_seconds: self.ttl_sweep_duration_seconds.clone(),\n324\t ttl_pending_estimate: self.ttl_pending_estimate.clone(),\n325\t tenant_queries_total: self.tenant_queries_total.clone(),\n326\t tenant_pinned_groups: self.tenant_pinned_groups.clone(),\n327\t tenant_fallback_total: self.tenant_fallback_total.clone(),\n328\t shadow_diff_total: self.shadow_diff_total.clone(),\n329\t shadow_kendall_tau: self.shadow_kendall_tau.clone(),\n330\t shadow_latency_delta_seconds: self.shadow_latency_delta_seconds.clone(),\n331\t shadow_errors_total: self.shadow_errors_total.clone(),\n332\t rollover_events_total: self.rollover_events_total.clone(),\n333\t rollover_active_indexes: self.rollover_active_indexes.clone(),\n334\t rollover_documents_expired_total: self.rollover_documents_expired_total.clone(),\n335\t rollover_last_action_seconds: self.rollover_last_action_seconds.clone(),\n336\t canary_runs_total: self.canary_runs_total.clone(),\n337\t canary_latency_ms: self.canary_latency_ms.clone(),\n338\t canary_assertion_failures_total: self.canary_assertion_failures_total.clone(),\n339\t admin_ui_sessions_total: self.admin_ui_sessions_total.clone(),\n340\t admin_ui_action_total: self.admin_ui_action_total.clone(),\n341\t admin_ui_destructive_action_total: self.admin_ui_destructive_action_total.clone(),\n342\t explain_requests_total: self.explain_requests_total.clone(),\n343\t explain_warnings_total: self.explain_warnings_total.clone(),\n344\t explain_execute_total: self.explain_execute_total.clone(),\n345\t search_ui_sessions_total: self.search_ui_sessions_total.clone(),\n346\t search_ui_queries_total: self.search_ui_queries_total.clone(),\n347\t search_ui_zero_hits_total: self.search_ui_zero_hits_total.clone(),\n348\t search_ui_click_through_total: self.search_ui_click_through_total.clone(),\n349\t search_ui_p95_ms: self.search_ui_p95_ms.clone(),\n350\t memory_pressure: self.memory_pressure.clone(),\n351\t cpu_throttled_seconds_total: self.cpu_throttled_seconds_total.clone(),\n352\t request_queue_depth: self.request_queue_depth.clone(),\n353\t background_queue_depth: self.background_queue_depth.clone(),\n354\t peer_pod_count: self.peer_pod_count.clone(),\n355\t leader: self.leader.clone(),\n356\t owned_shards_count: self.owned_shards_count.clone(),\n357\t admin_session_key_generated: self.admin_session_key_generated.clone(),\n358\t admin_session_revoked_total: self.admin_session_revoked_total.clone(),\n359\t settings_broadcast_phase: self.settings_broadcast_phase.clone(),\n360\t settings_hash_mismatch_total: self.settings_hash_mismatch_total.clone(),\n361\t settings_drift_repair_total: self.settings_drift_repair_total.clone(),\n362\t settings_version: self.settings_version.clone(),\n363\t alias_resolutions_total: self.alias_resolutions_total.clone(),\n364\t alias_flips_total: self.alias_flips_total.clone(),\n365\t session_active_count: self.session_active_count.clone(),\n366\t session_pin_enforced_total: self.session_pin_enforced_total.clone(),\n367\t session_wait_duration_seconds: self.session_wait_duration_seconds.clone(),\n368\t session_wait_timeout_total: self.session_wait_timeout_total.clone(),\n369\t }\n370\t }\n371\t}\n372\t\n373\timpl Default for Metrics {\n374\t fn default() -> Self {\n375\t Self::new(&MiroirConfig::default())\n376\t }\n377\t}\n378\t\n379\timpl Metrics {\n380\t pub fn new(config: &MiroirConfig) -> Self {\n381\t let registry = Registry::new();\n382\t\n383\t // ── Request metrics ──\n384\t let request_duration = HistogramVec::new(\n385\t HistogramOpts::new(\"miroir_request_duration_seconds\", \"Request latency in seconds\")\n386\t .buckets(vec![0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0, 10.0]),\n387\t &[\"method\", \"path_template\", \"status\"],\n388\t )\n389\t .expect(\"failed to create request_duration histogram\");\n390\t\n391\t let requests_total = CounterVec::new(\n392\t Opts::new(\"miroir_requests_total\", \"Total number of requests\"),\n393\t &[\"method\", \"path_template\", \"status\"],\n394\t )\n395\t .expect(\"failed to create requests_total counter\");\n396\t\n397\t let requests_in_flight = Gauge::with_opts(\n398\t Opts::new(\"miroir_requests_in_flight\", \"Number of requests currently being processed\"),\n399\t )"}]},"parent_tool_use_id":"call_d8ab3450251e405481f12a94","session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","uuid":"f3a9e8e1-3c20-4cf8-aa78-0fa24bc9105d","timestamp":"2026-05-23T05:57:36.327Z"} -{"type":"system","subtype":"task_notification","task_id":"aae5896710b97f4d2","tool_use_id":"call_d8ab3450251e405481f12a94","status":"completed","output_file":"","summary":"Explore codebase for rebalancer implementation","usage":{"total_tokens":0,"tool_uses":23,"duration_ms":65465},"uuid":"f1a3c6bc-8cb3-47a1-a0ce-3b64c6fab0a8","session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97"} -{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_d8ab3450251e405481f12a94","type":"tool_result","content":[{"type":"text","text":"Now I have enough information to provide a comprehensive summary. Let me compile my findings:\n\n## Summary of Miroir Codebase Analysis\n\nBased on my exploration of the Miroir codebase, here's a comprehensive summary of the existing patterns and structures relevant to Phase 5 rebalancing implementation:\n\n### 1. Background Task Patterns\n\n**File: `/home/coding/miroir/crates/miroir-core/src/task_pruner.rs`**\n- **Pattern**: Advisory lock-based background worker\n- **Key Implementation**:\n - Uses `try_acquire_leader_lease()` from TaskStore with scope `\"pruner:task_ttl\"`\n - Holder ID format: `\"pruner-{}\"` with process ID\n - Runs in background thread with configurable interval\n - PrunerHandle for graceful shutdown via atomic boolean flag\n - Prometheus gauge: `TASK_REGISTRY_SIZE` (AtomicU64)\n\n**Key Pattern Elements**:\n```rust\n// Leader lease acquisition\nlet acquired = store.try_acquire_leader_lease(LOCK_SCOPE, &holder, expires_at, now)?;\n\n// Background thread with stop flag\nlet stop = Arc::AtomicBool::new(false);\nthread::spawn(move || {\n loop {\n if stop.load(Ordering::Relaxed) { break; }\n // Work here\n thread::sleep(interval);\n }\n});\n```\n\n### 2. Leader Lease/Advisory Lock Implementation\n\n**File: `/home/coding/miroir/crates/miroir-core/src/task_store/mod.rs`**\n- **Table 7: leader_lease** with operations:\n - `try_acquire_leader_lease(scope, holder, expires_at, now_ms) -> Result`\n - `renew_leader_lease(scope, holder, expires_at) -> Result`\n - `get_leader_lease(scope) -> Result>`\n\n**LeaderLeaseRow Structure**:\n```rust\npub struct LeaderLeaseRow {\n pub scope: String,\n pub holder: String,\n pub expires_at: i64,\n}\n```\n\n### 3. Router Implementation (Phase 1)\n\n**File: `/home/coding/miroir/crates/miroir-core/src/router.rs`**\n- **Key Functions**:\n - `assign_shard_in_group(shard_id, group_nodes, rf) -> Vec`\n - `write_targets(shard_id, topology) -> Vec`\n - `score(shard_id, node_id) -> u64` (rendezvous hash scoring)\n - `count_assignment_diff(old_shards, new_shards) -> usize`\n\n**Pattern**: Deterministic shard assignment using rendezvous hash with tie-breaking by node_id lexicographic order.\n\n### 4. Jobs Table Structure (Phase 3)\n\n**File: `/home/coding/miroir/crates/miroir-core/src/task_store/mod.rs`**\n- **Table 6: jobs** with operations:\n - `insert_job(&NewJob) -> Result<()>`\n - `get_job(id) -> Result>`\n - `claim_job(id, claimed_by, claim_expires_at) -> Result` (CAS)\n - `update_job_progress(id, state, progress) -> Result`\n - `renew_job_claim(id, claim_expires_at) -> Result`\n - `list_jobs_by_state(state) -> Result>`\n\n**JobRow Structure**:\n```rust\npub struct JobRow {\n pub id: String,\n pub type_: String,\n pub params: String,\n pub state: String,\n pub claimed_by: Option,\n pub claim_expires_at: Option,\n pub progress: String,\n}\n```\n\n### 5. Metrics Patterns (miroir_rebalance_*)\n\n**File: `/home/coding/miroir/crates/miroir-proxy/src/middleware.rs`**\n- **Existing Rebalancer Metrics**:\n - `rebalance_in_progress: Gauge`\n - `rebalance_documents_migrated: Counter`\n - `rebalance_duration: Histogram`\n\n**Metric Update Pattern**:\n```rust\n// In RebalancerWorker\nlet metrics_callback: RebalancerMetricsCallback = Arc::new(\n move |in_progress: bool, docs_migrated: Option, duration_secs: Option| {\n if in_progress {\n metrics.set_rebalance_in_progress(true);\n }\n if let Some(count) = docs_migrated {\n metrics.inc_rebalance_documents_migrated(count);\n }\n if let Some(duration) = duration_secs {\n metrics.observe_rebalance_duration(duration);\n }\n }\n);\n```\n\n### 6. Topology Change Events\n\n**File: `/home/coding/miroir/crates/miroir-core/src/rebalancer_worker/mod.rs`**\n- **TopologyChangeEvent Enum**:\n```rust\npub enum TopologyChangeEvent {\n NodeAdded { node_id, replica_group, index_uid },\n NodeDraining { node_id, replica_group, index_uid },\n NodeFailed { node_id, replica_group, index_uid },\n NodeRecovered { node_id, replica_group, index_uid },\n}\n```\n\n**Event Sending Pattern**:\n```rust\n// Channel-based event delivery\nlet (event_tx, event_rx) = mpsc::channel(100);\nworker.event_sender().try_send(event)?;\n```\n\n### 7. Admin API Structure\n\n**File: `/home/coding/miroir/crates/miroir-proxy/src/routes/admin.rs`**\n- **Admin Endpoints**:\n - `POST /_miroir/nodes` - Add node to replica group\n - `DELETE /_miroir/nodes/{id}` - Remove node from cluster\n - `POST /_miroir/nodes/{id}/drain` - Drain a node\n - `POST /_miroir/nodes/{id}/fail` - Mark node as failed\n - `POST /_miroir/nodes/{id}/recover` - Mark node as recovered\n - `GET /_miroir/rebalance/status` - Get rebalance status\n\n**File: `/home/coding/miroir/crates/miroir-proxy/src/routes/admin_endpoints.rs`**\n- **Implementation Pattern**:\n```rust\npub async fn add_node(\n State(state): State,\n Json(body): Json,\n) -> Result, (StatusCode, String)>\n{\n // 1. Validate and extract request parameters\n // 2. Update topology\n // 3. Send event to rebalancer worker\n // 4. Return response\n}\n```\n\n### Key Structures and Patterns to Follow:\n\n1. **Background Worker Pattern**: Use advisory locks with leader lease, Tokio tasks for async processing, and event channels for communication.\n\n2. **Topology State Management**: Thread-safe `Arc>` with node status transitions and group management.\n\n3. **Migration Coordination**: Integration with `MigrationCoordinator` for shard migration state machine.\n\n4. **Metrics Integration**: Prometheus metrics with callbacks for real-time updates during rebalancing operations.\n\n5. **Error Handling**: Use `Result` for API endpoints and proper error propagation.\n\n6. **Configuration**: Extensive configuration via `MiroirConfig` with sensible defaults.\n\n### Gaps/Missing Components for Phase 5:\n\n1. **No automatic topology change detection** - Currently relies on manual admin API calls\n2. **Missing health-based triggering** - No automatic rebalancing based on node health degradation\n3. **Incomplete integration** between rebalancer worker and health checker for automatic failure detection\n4. **No rebalance job scheduling** - Jobs are created reactively, not scheduled based on cluster state\n\nThis codebase provides a solid foundation with clear patterns to follow for implementing Phase 5 automatic rebalancing triggered by topology changes."}]}]},"parent_tool_use_id":null,"session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","uuid":"7e9ee1cd-9661-4bd0-b9b4-91c9771d0e73","timestamp":"2026-05-23T05:58:03.272Z","tool_use_result":{"status":"completed","prompt":"Explore the Miroir codebase to understand:\n1. Existing background task patterns (health checker, etc.)\n2. Leader lease/advisory lock implementation\n3. Router implementation from Phase 1\n4. Jobs table structure from Phase 3\n5. Metrics patterns (miroir_rebalance_*)\n6. Topology change events (node add/drain/fail/recover)\n7. Admin API structure for triggering rebalances\n\nFocus on:\n- crates/miroir-core/src/\n- Any existing background workers\n- Leader lease implementation\n- Router module\n- Jobs/task-store module\n- Metrics module\n\nReturn a concise summary of:\n1. File paths and key structures for each component\n2. Existing patterns I should follow\n3. Any gaps or missing components I need to create","agentId":"aae5896710b97f4d2","agentType":"Explore","content":[{"type":"text","text":"Now I have enough information to provide a comprehensive summary. Let me compile my findings:\n\n## Summary of Miroir Codebase Analysis\n\nBased on my exploration of the Miroir codebase, here's a comprehensive summary of the existing patterns and structures relevant to Phase 5 rebalancing implementation:\n\n### 1. Background Task Patterns\n\n**File: `/home/coding/miroir/crates/miroir-core/src/task_pruner.rs`**\n- **Pattern**: Advisory lock-based background worker\n- **Key Implementation**:\n - Uses `try_acquire_leader_lease()` from TaskStore with scope `\"pruner:task_ttl\"`\n - Holder ID format: `\"pruner-{}\"` with process ID\n - Runs in background thread with configurable interval\n - PrunerHandle for graceful shutdown via atomic boolean flag\n - Prometheus gauge: `TASK_REGISTRY_SIZE` (AtomicU64)\n\n**Key Pattern Elements**:\n```rust\n// Leader lease acquisition\nlet acquired = store.try_acquire_leader_lease(LOCK_SCOPE, &holder, expires_at, now)?;\n\n// Background thread with stop flag\nlet stop = Arc::AtomicBool::new(false);\nthread::spawn(move || {\n loop {\n if stop.load(Ordering::Relaxed) { break; }\n // Work here\n thread::sleep(interval);\n }\n});\n```\n\n### 2. Leader Lease/Advisory Lock Implementation\n\n**File: `/home/coding/miroir/crates/miroir-core/src/task_store/mod.rs`**\n- **Table 7: leader_lease** with operations:\n - `try_acquire_leader_lease(scope, holder, expires_at, now_ms) -> Result`\n - `renew_leader_lease(scope, holder, expires_at) -> Result`\n - `get_leader_lease(scope) -> Result>`\n\n**LeaderLeaseRow Structure**:\n```rust\npub struct LeaderLeaseRow {\n pub scope: String,\n pub holder: String,\n pub expires_at: i64,\n}\n```\n\n### 3. Router Implementation (Phase 1)\n\n**File: `/home/coding/miroir/crates/miroir-core/src/router.rs`**\n- **Key Functions**:\n - `assign_shard_in_group(shard_id, group_nodes, rf) -> Vec`\n - `write_targets(shard_id, topology) -> Vec`\n - `score(shard_id, node_id) -> u64` (rendezvous hash scoring)\n - `count_assignment_diff(old_shards, new_shards) -> usize`\n\n**Pattern**: Deterministic shard assignment using rendezvous hash with tie-breaking by node_id lexicographic order.\n\n### 4. Jobs Table Structure (Phase 3)\n\n**File: `/home/coding/miroir/crates/miroir-core/src/task_store/mod.rs`**\n- **Table 6: jobs** with operations:\n - `insert_job(&NewJob) -> Result<()>`\n - `get_job(id) -> Result>`\n - `claim_job(id, claimed_by, claim_expires_at) -> Result` (CAS)\n - `update_job_progress(id, state, progress) -> Result`\n - `renew_job_claim(id, claim_expires_at) -> Result`\n - `list_jobs_by_state(state) -> Result>`\n\n**JobRow Structure**:\n```rust\npub struct JobRow {\n pub id: String,\n pub type_: String,\n pub params: String,\n pub state: String,\n pub claimed_by: Option,\n pub claim_expires_at: Option,\n pub progress: String,\n}\n```\n\n### 5. Metrics Patterns (miroir_rebalance_*)\n\n**File: `/home/coding/miroir/crates/miroir-proxy/src/middleware.rs`**\n- **Existing Rebalancer Metrics**:\n - `rebalance_in_progress: Gauge`\n - `rebalance_documents_migrated: Counter`\n - `rebalance_duration: Histogram`\n\n**Metric Update Pattern**:\n```rust\n// In RebalancerWorker\nlet metrics_callback: RebalancerMetricsCallback = Arc::new(\n move |in_progress: bool, docs_migrated: Option, duration_secs: Option| {\n if in_progress {\n metrics.set_rebalance_in_progress(true);\n }\n if let Some(count) = docs_migrated {\n metrics.inc_rebalance_documents_migrated(count);\n }\n if let Some(duration) = duration_secs {\n metrics.observe_rebalance_duration(duration);\n }\n }\n);\n```\n\n### 6. Topology Change Events\n\n**File: `/home/coding/miroir/crates/miroir-core/src/rebalancer_worker/mod.rs`**\n- **TopologyChangeEvent Enum**:\n```rust\npub enum TopologyChangeEvent {\n NodeAdded { node_id, replica_group, index_uid },\n NodeDraining { node_id, replica_group, index_uid },\n NodeFailed { node_id, replica_group, index_uid },\n NodeRecovered { node_id, replica_group, index_uid },\n}\n```\n\n**Event Sending Pattern**:\n```rust\n// Channel-based event delivery\nlet (event_tx, event_rx) = mpsc::channel(100);\nworker.event_sender().try_send(event)?;\n```\n\n### 7. Admin API Structure\n\n**File: `/home/coding/miroir/crates/miroir-proxy/src/routes/admin.rs`**\n- **Admin Endpoints**:\n - `POST /_miroir/nodes` - Add node to replica group\n - `DELETE /_miroir/nodes/{id}` - Remove node from cluster\n - `POST /_miroir/nodes/{id}/drain` - Drain a node\n - `POST /_miroir/nodes/{id}/fail` - Mark node as failed\n - `POST /_miroir/nodes/{id}/recover` - Mark node as recovered\n - `GET /_miroir/rebalance/status` - Get rebalance status\n\n**File: `/home/coding/miroir/crates/miroir-proxy/src/routes/admin_endpoints.rs`**\n- **Implementation Pattern**:\n```rust\npub async fn add_node(\n State(state): State,\n Json(body): Json,\n) -> Result, (StatusCode, String)>\n{\n // 1. Validate and extract request parameters\n // 2. Update topology\n // 3. Send event to rebalancer worker\n // 4. Return response\n}\n```\n\n### Key Structures and Patterns to Follow:\n\n1. **Background Worker Pattern**: Use advisory locks with leader lease, Tokio tasks for async processing, and event channels for communication.\n\n2. **Topology State Management**: Thread-safe `Arc>` with node status transitions and group management.\n\n3. **Migration Coordination**: Integration with `MigrationCoordinator` for shard migration state machine.\n\n4. **Metrics Integration**: Prometheus metrics with callbacks for real-time updates during rebalancing operations.\n\n5. **Error Handling**: Use `Result` for API endpoints and proper error propagation.\n\n6. **Configuration**: Extensive configuration via `MiroirConfig` with sensible defaults.\n\n### Gaps/Missing Components for Phase 5:\n\n1. **No automatic topology change detection** - Currently relies on manual admin API calls\n2. **Missing health-based triggering** - No automatic rebalancing based on node health degradation\n3. **Incomplete integration** 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Background TTL pruner for the tasks table (plan §4, Phase 3).\n2\t//!\n3\t//! Runs on a configurable interval, acquires an advisory lock via the\n4\t//! `leader_lease` table, and batch-deletes terminal tasks older than\n5\t//! `task_registry.ttl_seconds`. Phase 6 §14.5 Mode A replaces the\n6\t//! single-pod advisory lock with rendezvous-partitioned ownership.\n7\t\n8\tuse crate::config::TaskRegistryConfig;\n9\tuse crate::task_store::TaskStore;\n10\tuse std::sync::atomic::{AtomicU64, Ordering};\n11\tuse std::sync::Arc;\n12\tuse std::thread;\n13\tuse std::time::{Duration, Instant};\n14\tuse tracing::{debug, error, info, warn};\n15\t\n16\t/// Prometheus-style gauge exposed per plan §10.\n17\t/// Updated by the pruner after each cycle.\n18\tstatic TASK_REGISTRY_SIZE: AtomicU64 = AtomicU64::new(0);\n19\t\n20\t/// Read the current `miroir_task_registry_size` gauge value.\n21\tpub fn task_registry_size() -> u64 {\n22\t TASK_REGISTRY_SIZE.load(Ordering::Relaxed)\n23\t}\n24\t\n25\t/// Advisory lock scope used by the pruner.\n26\tconst LOCK_SCOPE: &str = \"pruner:task_ttl\";\n27\t\n28\t/// Holder identity for this pruner instance.\n29\tfn holder_id() -> String {\n30\t format!(\"pruner-{}\", std::process::id())\n31\t}\n32\t\n33\t/// Run a single pruner iteration. Returns the number of tasks deleted.\n34\t///\n35\t/// 1. Try to acquire the advisory lock (leader_lease).\n36\t/// 2. Compute cutoff = now - ttl_seconds.\n37\t/// 3. Batch-delete terminal tasks older than cutoff.\n38\t/// 4. Update the `miroir_task_registry_size` gauge.\n39\t/// 5. Release the lock.\n40\tpub fn prune_once(store: &dyn TaskStore, cfg: &TaskRegistryConfig) -> usize {\n41\t let holder = holder_id();\n42\t let now = now_ms();\n43\t let lease_duration_ms = (cfg.prune_interval_s * 1000) + 30_000; // interval + 30s buffer\n44\t let expires_at = now + lease_duration_ms as i64;\n45\t\n46\t // Step 1: advisory lock\n47\t let acquired = match store.try_acquire_leader_lease(LOCK_SCOPE, &holder, expires_at, now) {\n48\t Ok(true) => true,\n49\t Ok(false) => {\n50\t debug!(\"pruner: another instance holds the lock, skipping\");\n51\t return 0;\n52\t }\n53\t Err(e) => {\n54\t error!(\"pruner: failed to acquire lock: {e}\");\n55\t return 0;\n56\t }\n57\t };\n58\t\n59\t let result = prune_inner(store, cfg);\n60\t\n61\t // Release lock\n62\t if acquired {\n63\t if let Err(e) = store.renew_leader_lease(LOCK_SCOPE, &holder, now) {\n64\t warn!(\"pruner: failed to release lock: {e}\");\n65\t }\n66\t }\n67\t\n68\t result\n69\t}\n70\t\n71\tfn prune_inner(store: &dyn TaskStore, cfg: &TaskRegistryConfig) -> usize {\n72\t let now = now_ms();\n73\t let cutoff = now - (cfg.ttl_seconds * 1000) as i64;\n74\t\n75\t debug!(\"pruner: running with cutoff={cutoff}, batch_size={}\", cfg.prune_batch_size);\n76\t\n77\t let mut total_deleted = 0usize;\n78\t loop {\n79\t match store.prune_tasks(cutoff, cfg.prune_batch_size) {\n80\t Ok(deleted) => {\n81\t total_deleted += deleted;\n82\t if deleted < cfg.prune_batch_size as usize {\n83\t break; // no more rows to prune\n84\t }\n85\t }\n86\t Err(e) => {\n87\t error!(\"pruner: delete batch failed: {e}\");\n88\t break;\n89\t }\n90\t }\n91\t }\n92\t\n93\t // Update gauge\n94\t match store.task_count() {\n95\t Ok(count) => {\n96\t TASK_REGISTRY_SIZE.store(count, Ordering::Relaxed);\n97\t info!(\"pruner: deleted {total_deleted} tasks, registry_size={count}\");\n98\t }\n99\t Err(e) => {\n100\t error!(\"pruner: failed to count tasks: {e}\");\n101\t }\n102\t }\n103\t\n104\t total_deleted\n105\t}\n106\t\n107\t/// Spawn a background thread that runs `prune_once` on a fixed interval.\n108\t///\n109\t/// Call this once at startup. The thread is daemon-like: it exits when\n110\t/// the returned `PrunerHandle` is dropped or the process exits.\n111\tpub fn spawn_pruner(\n112\t store: Arc,\n113\t cfg: TaskRegistryConfig,\n114\t) -> PrunerHandle {\n115\t let interval = Duration::from_secs(cfg.prune_interval_s);\n116\t let stop = std::sync::atomic::AtomicBool::new(false);\n117\t let stop_flag = Arc::new(stop);\n118\t\n119\t let flag_ref = Arc::clone(&stop_flag);\n120\t let handle = thread::Builder::new()\n121\t .name(\"miroir-task-pruner\".into())\n122\t .spawn(move || {\n123\t info!(\"pruner: starting with interval={}s ttl={}s\", cfg.prune_interval_s, cfg.ttl_seconds);\n124\t loop {\n125\t if flag_ref.load(Ordering::Relaxed) {\n126\t info!(\"pruner: stopping\");\n127\t break;\n128\t }\n129\t let start = Instant::now();\n130\t prune_once(store.as_ref(), &cfg);\n131\t let elapsed = start.elapsed();\n132\t if elapsed < interval {\n133\t // Sleep in small increments to check stop flag\n134\t let remaining = interval - elapsed;\n135\t let check_interval = Duration::from_secs(1);\n136\t let mut slept = Duration::ZERO;\n137\t while slept < remaining {\n138\t if flag_ref.load(Ordering::Relaxed) {\n139\t info!(\"pruner: stopping during sleep\");\n140\t return;\n141\t }\n142\t let sleep_dur = remaining - slept;\n143\t let sleep_dur = sleep_dur.min(check_interval);\n144\t thread::sleep(sleep_dur);\n145\t slept += sleep_dur;\n146\t }\n147\t }\n148\t }\n149\t })\n150\t .expect(\"failed to spawn pruner thread\");\n151\t\n152\t PrunerHandle {\n153\t handle: Some(handle),\n154\t stop_flag,\n155\t }\n156\t}\n157\t\n158\t/// Handle to the background pruner thread. Dropping this signals the\n159\t/// pruner to stop and joins the thread.\n160\tpub struct PrunerHandle {\n161\t handle: Option>,\n162\t stop_flag: Arc,\n163\t}\n164\t\n165\timpl PrunerHandle {\n166\t /// Signal the pruner to stop and wait for it to finish.\n167\t pub fn stop(&mut self) {\n168\t self.stop_flag.store(true, Ordering::Relaxed);\n169\t if let Some(h) = self.handle.take() {\n170\t let _ = h.join();\n171\t }\n172\t }\n173\t}\n174\t\n175\timpl Drop for PrunerHandle {\n176\t fn drop(&mut self) {\n177\t self.stop();\n178\t }\n179\t}\n180\t\n181\tfn now_ms() -> i64 {\n182\t std::time::SystemTime::now()\n183\t .duration_since(std::time::UNIX_EPOCH)\n184\t .unwrap()\n185\t .as_millis() as i64\n186\t}\n187\t\n188\t#[cfg(test)]\n189\tmod tests {\n190\t use super::*;\n191\t use crate::config::TaskRegistryConfig;\n192\t use crate::task_store::{NewTask, SqliteTaskStore, TaskStore};\n193\t use std::collections::HashMap;\n194\t use std::sync::Mutex;\n195\t\n196\t /// Serialize tests that read/write the global `TASK_REGISTRY_SIZE` gauge.\n197\t static GAUGE_LOCK: Mutex<()> = Mutex::new(());\n198\t\n199\t fn test_store() -> SqliteTaskStore {\n200\t let store = SqliteTaskStore::open_in_memory().unwrap();\n201\t store.migrate().unwrap();\n202\t store\n203\t }\n204\t\n205\t fn default_cfg() -> TaskRegistryConfig {\n206\t TaskRegistryConfig::default()\n207\t }\n208\t\n209\t /// Helper: insert a task with given id, created_at, status.\n210\t fn insert_task(store: &dyn TaskStore, id: &str, created_at: i64, status: &str) {\n211\t store\n212\t .insert_task(&NewTask {\n213\t miroir_id: id.to_string(),\n214\t created_at,\n215\t status: status.to_string(),\n216\t node_tasks: HashMap::new(),\n217\t error: None,\n218\t started_at: None,\n219\t finished_at: None,\n220\t index_uid: None,\n221\t task_type: None,\n222\t node_errors: HashMap::new(),\n223\t })\n224\t .unwrap();\n225\t }\n226\t\n227\t /// Helper: return current time in ms.\n228\t fn now() -> i64 {\n229\t std::time::SystemTime::now()\n230\t .duration_since(std::time::UNIX_EPOCH)\n231\t .unwrap()\n232\t .as_millis() as i64\n233\t }\n234\t\n235\t /// Acceptance: After insert of 10k terminal tasks with created_at = now - 8d,\n236\t /// next pruner cycle drops all 10k.\n237\t #[test]\n238\t fn pruner_deletes_10k_old_terminal_tasks() {\n239\t let _lock = GAUGE_LOCK.lock().unwrap_or_else(|e| e.into_inner());\n240\t let store = test_store();\n241\t let eight_days_ms: i64 = 8 * 24 * 3600 * 1000;\n242\t let old_time = now() - eight_days_ms;\n243\t\n244\t // Insert 10k terminal tasks at old_time\n245\t for i in 0..10_000 {\n246\t let status = match i % 3 {\n247\t 0 => \"succeeded\",\n248\t 1 => \"failed\",\n249\t _ => \"canceled\",\n250\t };\n251\t insert_task(&store, &format!(\"old-{i}\"), old_time, status);\n252\t }\n253\t\n254\t assert_eq!(store.task_count().unwrap(), 10_000);\n255\t\n256\t let mut cfg = default_cfg();\n257\t cfg.ttl_seconds = 7 * 24 * 3600; // 7 days\n258\t let deleted = prune_once(&store, &cfg);\n259\t\n260\t assert_eq!(deleted, 10_000);\n261\t assert_eq!(store.task_count().unwrap(), 0);\n262\t assert_eq!(task_registry_size(), 0);\n263\t }\n264\t\n265\t /// Acceptance: A single in-flight `processing` task at created_at = now - 10d is preserved.\n266\t #[test]\n267\t fn pruner_preserves_processing_tasks() {\n268\t let _lock = GAUGE_LOCK.lock().unwrap_or_else(|e| e.into_inner());\n269\t let store = test_store();\n270\t let ten_days_ms: i64 = 10 * 24 * 3600 * 1000;\n271\t let old_time = now() - ten_days_ms;\n272\t\n273\t // Insert an old processing task\n274\t insert_task(&store, \"processing-old\", old_time, \"processing\");\n275\t\n276\t // Also insert old terminal tasks that should be deleted\n277\t insert_task(&store, \"succeeded-old\", old_time, \"succeeded\");\n278\t insert_task(&store, \"failed-old\", old_time, \"failed\");\n279\t\n280\t assert_eq!(store.task_count().unwrap(), 3);\n281\t\n282\t let cfg = default_cfg();\n283\t let deleted = prune_once(&store, &cfg);\n284\t\n285\t assert_eq!(deleted, 2);\n286\t assert!(store.get_task(\"processing-old\").unwrap().is_some());\n287\t assert!(store.get_task(\"succeeded-old\").unwrap().is_none());\n288\t assert!(store.get_task(\"failed-old\").unwrap().is_none());\n289\t assert_eq!(store.task_count().unwrap(), 1);\n290\t }\n291\t\n292\t /// Acceptance: Pruner advisory lock prevents two instances pruning simultaneously.\n293\t #[test]\n294\t fn advisory_lock_prevents_concurrent_pruning() {\n295\t let _lock = GAUGE_LOCK.lock().unwrap_or_else(|e| e.into_inner());\n296\t let store = test_store();\n297\t let ten_days_ms: i64 = 10 * 24 * 3600 * 1000;\n298\t let old_time = now() - ten_days_ms;\n299\t\n300\t // Insert old tasks\n301\t for i in 0..100 {\n302\t insert_task(&store, &format!(\"old-{i}\"), old_time, \"succeeded\");\n303\t }\n304\t\n305\t let cfg = default_cfg();\n306\t\n307\t // Manually acquire the lock as another instance\n308\t let now = std::time::SystemTime::now()\n309\t .duration_since(std::time::UNIX_EPOCH)\n310\t .unwrap()\n311\t .as_millis() as i64;\n312\t let other_holder = \"other-pruner-999\";\n313\t store\n314\t .try_acquire_leader_lease(LOCK_SCOPE, other_holder, now + 600_000, now)\n315\t .unwrap();\n316\t\n317\t // prune_once should see the lock held and skip\n318\t let deleted = prune_once(&store, &cfg);\n319\t assert_eq!(deleted, 0);\n320\t // Tasks should still be there\n321\t assert_eq!(store.task_count().unwrap(), 100);\n322\t }\n323\t\n324\t /// Acceptance: miroir_task_registry_size gauge drops after a prune cycle.\n325\t #[test]\n326\t fn gauge_drops_after_prune() {\n327\t let _lock = GAUGE_LOCK.lock().unwrap_or_else(|e| e.into_inner());\n328\t let store = test_store();\n329\t let ten_days_ms: i64 = 10 * 24 * 3600 * 1000;\n330\t let old_time = now() - ten_days_ms;\n331\t\n332\t // Insert 5 old + 5 recent tasks\n333\t for i in 0..5 {\n334\t insert_task(&store, &format!(\"old-{i}\"), old_time, \"succeeded\");\n335\t }\n336\t for i in 0..5 {\n337\t insert_task(&store, &format!(\"new-{i}\"), now(), \"succeeded\");\n338\t }\n339\t\n340\t assert_eq!(store.task_count().unwrap(), 10);\n341\t\n342\t let cfg = default_cfg();\n343\t prune_once(&store, &cfg);\n344\t\n345\t // Gauge should reflect remaining tasks\n346\t assert_eq!(task_registry_size(), 5);\n347\t assert_eq!(store.task_count().unwrap(), 5);\n348\t }\n349\t\n350\t /// Test that pruner respects batch_size — multiple iterations needed.\n351\t #[test]\n352\t fn pruner_batches_correctly() {\n353\t let _lock = GAUGE_LOCK.lock().unwrap_or_else(|e| e.into_inner());\n354\t let store = test_store();\n355\t let ten_days_ms: i64 = 10 * 24 * 3600 * 1000;\n356\t let old_time = now() - ten_days_ms;\n357\t\n358\t for i in 0..25 {\n359\t insert_task(&store, &format!(\"old-{i}\"), old_time, \"succeeded\");\n360\t }\n361\t\n362\t let mut cfg = default_cfg();\n363\t cfg.prune_batch_size = 10; // small batch\n364\t let deleted = prune_once(&store, &cfg);\n365\t\n366\t assert_eq!(deleted, 25); // all deleted via multiple batches\n367\t assert_eq!(store.task_count().unwrap(), 0);\n368\t }\n369\t\n370\t /// Acceptance: spawn_pruner runs in background, PrunerHandle::stop joins cleanly.\n371\t #[test]\n372\t fn spawn_pruner_runs_and_stops() {\n373\t let _lock = GAUGE_LOCK.lock().unwrap_or_else(|e| e.into_inner());\n374\t let store = Arc::new(test_store());\n375\t let ten_days_ms: i64 = 10 * 24 * 3600 * 1000;\n376\t let old_time = now() - ten_days_ms;\n377\t\n378\t for i in 0..5 {\n379\t insert_task(store.as_ref(), &format!(\"old-{i}\"), old_time, \"succeeded\");\n380\t }\n381\t\n382\t let mut cfg = default_cfg();\n383\t cfg.prune_interval_s = 1;\n384\t let mut handle = spawn_pruner(store.clone(), cfg);\n385\t\n386\t // Give the pruner a moment to run at least one cycle\n387\t thread::sleep(Duration::from_millis(200));\n388\t handle.stop();\n389\t\n390\t // Old tasks should be pruned\n391\t assert_eq!(store.task_count().unwrap(), 0);\n392\t }\n393\t\n394\t /// Acceptance: dropping PrunerHandle signals stop and joins.\n395\t #[test]\n396\t fn pruner_handle_drop_stops_thread() {\n397\t let _lock = GAUGE_LOCK.lock().unwrap_or_else(|e| e.into_inner());\n398\t let store = Arc::new(test_store());\n399\t let mut cfg = default_cfg();\n400\t cfg.prune_interval_s = 600; // long interval so it sleeps in the loop\n401\t {\n402\t let _handle = spawn_pruner(store, cfg);\n403\t // handle dropped here\n404\t }\n405\t // Thread should have stopped — if this hangs, the test will time out\n406\t }\n407\t}\n408\t"}]},"parent_tool_use_id":null,"session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","uuid":"942fe9f6-3bf1-4051-b54e-69e74d3db6ae","timestamp":"2026-05-23T05:58:08.056Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/crates/miroir-core/src/task_pruner.rs","content":"//! Background TTL pruner for the tasks table (plan §4, Phase 3).\n//!\n//! Runs on a configurable interval, acquires an advisory lock via the\n//! `leader_lease` table, and batch-deletes terminal tasks older than\n//! `task_registry.ttl_seconds`. Phase 6 §14.5 Mode A replaces the\n//! single-pod advisory lock with rendezvous-partitioned ownership.\n\nuse crate::config::TaskRegistryConfig;\nuse crate::task_store::TaskStore;\nuse std::sync::atomic::{AtomicU64, Ordering};\nuse std::sync::Arc;\nuse std::thread;\nuse std::time::{Duration, Instant};\nuse tracing::{debug, error, info, warn};\n\n/// Prometheus-style gauge exposed per plan §10.\n/// Updated by the pruner after each cycle.\nstatic TASK_REGISTRY_SIZE: AtomicU64 = AtomicU64::new(0);\n\n/// Read the current `miroir_task_registry_size` gauge value.\npub fn task_registry_size() -> u64 {\n TASK_REGISTRY_SIZE.load(Ordering::Relaxed)\n}\n\n/// Advisory lock scope used by the pruner.\nconst LOCK_SCOPE: &str = \"pruner:task_ttl\";\n\n/// Holder identity for this pruner instance.\nfn holder_id() -> String {\n format!(\"pruner-{}\", std::process::id())\n}\n\n/// Run a single pruner iteration. Returns the number of tasks deleted.\n///\n/// 1. Try to acquire the advisory lock (leader_lease).\n/// 2. Compute cutoff = now - ttl_seconds.\n/// 3. Batch-delete terminal tasks older than cutoff.\n/// 4. Update the `miroir_task_registry_size` gauge.\n/// 5. Release the lock.\npub fn prune_once(store: &dyn TaskStore, cfg: &TaskRegistryConfig) -> usize {\n let holder = holder_id();\n let now = now_ms();\n let lease_duration_ms = (cfg.prune_interval_s * 1000) + 30_000; // interval + 30s buffer\n let expires_at = now + lease_duration_ms as i64;\n\n // Step 1: advisory lock\n let acquired = match store.try_acquire_leader_lease(LOCK_SCOPE, &holder, expires_at, now) {\n Ok(true) => true,\n Ok(false) => {\n debug!(\"pruner: another instance holds the lock, skipping\");\n return 0;\n }\n Err(e) => {\n error!(\"pruner: failed to acquire lock: {e}\");\n return 0;\n }\n };\n\n let result = prune_inner(store, cfg);\n\n // Release lock\n if acquired {\n if let Err(e) = store.renew_leader_lease(LOCK_SCOPE, &holder, now) {\n warn!(\"pruner: failed to release lock: {e}\");\n }\n }\n\n result\n}\n\nfn prune_inner(store: &dyn TaskStore, cfg: &TaskRegistryConfig) -> usize {\n let now = now_ms();\n let cutoff = now - (cfg.ttl_seconds * 1000) as i64;\n\n debug!(\"pruner: running with cutoff={cutoff}, batch_size={}\", cfg.prune_batch_size);\n\n let mut total_deleted = 0usize;\n loop {\n match store.prune_tasks(cutoff, cfg.prune_batch_size) {\n Ok(deleted) => {\n total_deleted += deleted;\n if deleted < cfg.prune_batch_size as usize {\n break; // no more rows to prune\n }\n }\n Err(e) => {\n error!(\"pruner: delete batch failed: {e}\");\n break;\n }\n }\n }\n\n // Update gauge\n match store.task_count() {\n Ok(count) => {\n TASK_REGISTRY_SIZE.store(count, Ordering::Relaxed);\n info!(\"pruner: deleted {total_deleted} tasks, registry_size={count}\");\n }\n Err(e) => {\n error!(\"pruner: failed to count tasks: {e}\");\n }\n }\n\n total_deleted\n}\n\n/// Spawn a background thread that runs `prune_once` on a fixed interval.\n///\n/// Call this once at startup. The thread is daemon-like: it exits when\n/// the returned `PrunerHandle` is dropped or the process exits.\npub fn spawn_pruner(\n store: Arc,\n cfg: TaskRegistryConfig,\n) -> PrunerHandle {\n let interval = Duration::from_secs(cfg.prune_interval_s);\n let stop = std::sync::atomic::AtomicBool::new(false);\n let stop_flag = Arc::new(stop);\n\n let flag_ref = Arc::clone(&stop_flag);\n let handle = thread::Builder::new()\n .name(\"miroir-task-pruner\".into())\n .spawn(move || {\n info!(\"pruner: starting with interval={}s ttl={}s\", cfg.prune_interval_s, cfg.ttl_seconds);\n loop {\n if flag_ref.load(Ordering::Relaxed) {\n info!(\"pruner: stopping\");\n break;\n }\n let start = Instant::now();\n prune_once(store.as_ref(), &cfg);\n let elapsed = start.elapsed();\n if elapsed < interval {\n // Sleep in small increments to check stop flag\n let remaining = interval - elapsed;\n let check_interval = Duration::from_secs(1);\n let mut slept = Duration::ZERO;\n while slept < remaining {\n if flag_ref.load(Ordering::Relaxed) {\n info!(\"pruner: stopping during sleep\");\n return;\n }\n let sleep_dur = remaining - slept;\n let sleep_dur = sleep_dur.min(check_interval);\n thread::sleep(sleep_dur);\n slept += sleep_dur;\n }\n }\n }\n })\n .expect(\"failed to spawn pruner thread\");\n\n PrunerHandle {\n handle: Some(handle),\n stop_flag,\n }\n}\n\n/// Handle to the background pruner thread. Dropping this signals the\n/// pruner to stop and joins the thread.\npub struct PrunerHandle {\n handle: Option>,\n stop_flag: Arc,\n}\n\nimpl PrunerHandle {\n /// Signal the pruner to stop and wait for it to finish.\n pub fn stop(&mut self) {\n self.stop_flag.store(true, Ordering::Relaxed);\n if let Some(h) = self.handle.take() {\n let _ = h.join();\n }\n }\n}\n\nimpl Drop for PrunerHandle {\n fn drop(&mut self) {\n self.stop();\n }\n}\n\nfn now_ms() -> i64 {\n std::time::SystemTime::now()\n .duration_since(std::time::UNIX_EPOCH)\n .unwrap()\n .as_millis() as i64\n}\n\n#[cfg(test)]\nmod tests {\n use super::*;\n use crate::config::TaskRegistryConfig;\n use crate::task_store::{NewTask, SqliteTaskStore, TaskStore};\n use std::collections::HashMap;\n use std::sync::Mutex;\n\n /// Serialize tests that read/write the global `TASK_REGISTRY_SIZE` gauge.\n static GAUGE_LOCK: Mutex<()> = Mutex::new(());\n\n fn test_store() -> SqliteTaskStore {\n let store = SqliteTaskStore::open_in_memory().unwrap();\n store.migrate().unwrap();\n store\n }\n\n fn default_cfg() -> TaskRegistryConfig {\n TaskRegistryConfig::default()\n }\n\n /// Helper: insert a task with given id, created_at, status.\n fn insert_task(store: &dyn TaskStore, id: &str, created_at: i64, status: &str) {\n store\n .insert_task(&NewTask {\n miroir_id: id.to_string(),\n created_at,\n status: status.to_string(),\n node_tasks: HashMap::new(),\n error: None,\n started_at: None,\n finished_at: None,\n index_uid: None,\n task_type: None,\n node_errors: HashMap::new(),\n })\n .unwrap();\n }\n\n /// Helper: return current time in ms.\n fn now() -> i64 {\n std::time::SystemTime::now()\n .duration_since(std::time::UNIX_EPOCH)\n .unwrap()\n .as_millis() as i64\n }\n\n /// Acceptance: After insert of 10k terminal tasks with created_at = now - 8d,\n /// next pruner cycle drops all 10k.\n #[test]\n fn pruner_deletes_10k_old_terminal_tasks() {\n let _lock = GAUGE_LOCK.lock().unwrap_or_else(|e| e.into_inner());\n let store = test_store();\n let eight_days_ms: i64 = 8 * 24 * 3600 * 1000;\n let old_time = now() - eight_days_ms;\n\n // Insert 10k terminal tasks at old_time\n for i in 0..10_000 {\n let status = match i % 3 {\n 0 => \"succeeded\",\n 1 => \"failed\",\n _ => \"canceled\",\n };\n insert_task(&store, &format!(\"old-{i}\"), old_time, status);\n }\n\n assert_eq!(store.task_count().unwrap(), 10_000);\n\n let mut cfg = default_cfg();\n cfg.ttl_seconds = 7 * 24 * 3600; // 7 days\n let deleted = prune_once(&store, &cfg);\n\n assert_eq!(deleted, 10_000);\n assert_eq!(store.task_count().unwrap(), 0);\n assert_eq!(task_registry_size(), 0);\n }\n\n /// Acceptance: A single in-flight `processing` task at created_at = now - 10d is preserved.\n #[test]\n fn pruner_preserves_processing_tasks() {\n let _lock = GAUGE_LOCK.lock().unwrap_or_else(|e| e.into_inner());\n let store = test_store();\n let ten_days_ms: i64 = 10 * 24 * 3600 * 1000;\n let old_time = now() - ten_days_ms;\n\n // Insert an old processing task\n insert_task(&store, \"processing-old\", old_time, \"processing\");\n\n // Also insert old terminal tasks that should be deleted\n insert_task(&store, \"succeeded-old\", old_time, \"succeeded\");\n insert_task(&store, \"failed-old\", old_time, \"failed\");\n\n assert_eq!(store.task_count().unwrap(), 3);\n\n let cfg = default_cfg();\n let deleted = prune_once(&store, &cfg);\n\n assert_eq!(deleted, 2);\n assert!(store.get_task(\"processing-old\").unwrap().is_some());\n assert!(store.get_task(\"succeeded-old\").unwrap().is_none());\n assert!(store.get_task(\"failed-old\").unwrap().is_none());\n assert_eq!(store.task_count().unwrap(), 1);\n }\n\n /// Acceptance: Pruner advisory lock prevents two instances pruning simultaneously.\n #[test]\n fn advisory_lock_prevents_concurrent_pruning() {\n let _lock = GAUGE_LOCK.lock().unwrap_or_else(|e| e.into_inner());\n let store = test_store();\n let ten_days_ms: i64 = 10 * 24 * 3600 * 1000;\n let old_time = now() - ten_days_ms;\n\n // Insert old tasks\n for i in 0..100 {\n insert_task(&store, &format!(\"old-{i}\"), old_time, \"succeeded\");\n }\n\n let cfg = default_cfg();\n\n // Manually acquire the lock as another instance\n let now = std::time::SystemTime::now()\n .duration_since(std::time::UNIX_EPOCH)\n .unwrap()\n .as_millis() as i64;\n let other_holder = \"other-pruner-999\";\n store\n .try_acquire_leader_lease(LOCK_SCOPE, other_holder, now + 600_000, now)\n .unwrap();\n\n // prune_once should see the lock held and skip\n let deleted = prune_once(&store, &cfg);\n assert_eq!(deleted, 0);\n // Tasks should still be there\n assert_eq!(store.task_count().unwrap(), 100);\n }\n\n /// Acceptance: miroir_task_registry_size gauge drops after a prune cycle.\n #[test]\n fn gauge_drops_after_prune() {\n let _lock = GAUGE_LOCK.lock().unwrap_or_else(|e| e.into_inner());\n let store = test_store();\n let ten_days_ms: i64 = 10 * 24 * 3600 * 1000;\n let old_time = now() - ten_days_ms;\n\n // Insert 5 old + 5 recent tasks\n for i in 0..5 {\n insert_task(&store, &format!(\"old-{i}\"), old_time, \"succeeded\");\n }\n for i in 0..5 {\n insert_task(&store, &format!(\"new-{i}\"), now(), \"succeeded\");\n }\n\n assert_eq!(store.task_count().unwrap(), 10);\n\n let cfg = default_cfg();\n prune_once(&store, &cfg);\n\n // Gauge should reflect remaining tasks\n assert_eq!(task_registry_size(), 5);\n assert_eq!(store.task_count().unwrap(), 5);\n }\n\n /// Test that pruner respects batch_size — multiple iterations needed.\n #[test]\n fn pruner_batches_correctly() {\n let _lock = GAUGE_LOCK.lock().unwrap_or_else(|e| e.into_inner());\n let store = test_store();\n let ten_days_ms: i64 = 10 * 24 * 3600 * 1000;\n let old_time = now() - ten_days_ms;\n\n for i in 0..25 {\n insert_task(&store, &format!(\"old-{i}\"), old_time, \"succeeded\");\n }\n\n let mut cfg = default_cfg();\n cfg.prune_batch_size = 10; // small batch\n let deleted = prune_once(&store, &cfg);\n\n assert_eq!(deleted, 25); // all deleted via multiple batches\n assert_eq!(store.task_count().unwrap(), 0);\n }\n\n /// Acceptance: spawn_pruner runs in background, PrunerHandle::stop joins cleanly.\n #[test]\n fn spawn_pruner_runs_and_stops() {\n let _lock = GAUGE_LOCK.lock().unwrap_or_else(|e| e.into_inner());\n let store = Arc::new(test_store());\n let ten_days_ms: i64 = 10 * 24 * 3600 * 1000;\n let old_time = now() - ten_days_ms;\n\n for i in 0..5 {\n insert_task(store.as_ref(), &format!(\"old-{i}\"), old_time, \"succeeded\");\n }\n\n let mut cfg = default_cfg();\n cfg.prune_interval_s = 1;\n let mut handle = spawn_pruner(store.clone(), cfg);\n\n // Give the pruner a moment to run at least one cycle\n thread::sleep(Duration::from_millis(200));\n handle.stop();\n\n // Old tasks should be pruned\n assert_eq!(store.task_count().unwrap(), 0);\n }\n\n /// Acceptance: dropping PrunerHandle signals stop and joins.\n #[test]\n fn pruner_handle_drop_stops_thread() {\n let _lock = GAUGE_LOCK.lock().unwrap_or_else(|e| e.into_inner());\n let store = Arc::new(test_store());\n let mut cfg = default_cfg();\n cfg.prune_interval_s = 600; // long interval so it sleeps in the loop\n {\n let _handle = spawn_pruner(store, cfg);\n // handle dropped here\n }\n // Thread should have stopped — if this hangs, the test will time out\n }\n}\n","numLines":408,"startLine":1,"totalLines":408}}} -{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_2f60998d8aea460c9dbd89fb","type":"tool_result","content":"1\t//! Rendezvous hash-based routing and shard assignment.\n2\t\n3\tuse crate::migration::{MigrationCoordinator, ShardId};\n4\tuse crate::topology::{Group, NodeId, Topology};\n5\tuse std::collections::HashSet;\n6\tuse std::hash::{Hash, Hasher};\n7\tuse twox_hash::XxHash64;\n8\t\n9\t/// Compute a rendezvous score for a shard+node pair.\n10\t///\n11\t/// Higher scores win; used for deterministic shard assignment.\n12\tpub fn score(shard_id: u32, node_id: &str) -> u64 {\n13\t let mut h = XxHash64::with_seed(0);\n14\t shard_id.hash(&mut h);\n15\t node_id.hash(&mut h);\n16\t h.finish()\n17\t}\n18\t\n19\t/// Assign a shard to `rf` nodes within a single replica group.\n20\t///\n21\t/// `group_nodes` is the subset of nodes belonging to that group.\n22\t///\n23\t/// Sorts by score descending, breaking ties lexicographically on node_id\n24\t/// for deterministic resolution.\n25\tpub fn assign_shard_in_group(shard_id: u32, group_nodes: &[NodeId], rf: usize) -> Vec {\n26\t let mut scored: Vec<(u64, &NodeId)> = group_nodes\n27\t .iter()\n28\t .map(|n| (score(shard_id, n.as_str()), n))\n29\t .collect();\n30\t scored.sort_unstable_by(|a, b| {\n31\t b.0.cmp(&a.0)\n32\t .then_with(|| a.1.as_str().cmp(b.1.as_str()))\n33\t });\n34\t scored\n35\t .into_iter()\n36\t .take(rf)\n37\t .map(|(_, n)| n.clone())\n38\t .collect()\n39\t}\n40\t\n41\t/// All write targets for a document: the RF nodes in EACH replica group.\n42\tpub fn write_targets(shard_id: u32, topology: &Topology) -> Vec {\n43\t topology\n44\t .groups()\n45\t .flat_map(|group| assign_shard_in_group(shard_id, group.nodes(), topology.rf()))\n46\t .collect()\n47\t}\n48\t\n49\t/// All write targets for a document, considering dual-write state during migration.\n50\t///\n51\t/// This is the migration-aware version of `write_targets`. When a shard is in\n52\t/// dual-write phase (node addition in progress), it includes both the old owner\n53\t/// AND the new node in the target list to ensure no writes are lost during migration.\n54\t///\n55\t/// # Arguments\n56\t/// * `shard_id` - The shard ID being written to\n57\t/// * `topology` - The cluster topology\n58\t/// * `migration_coordinator` - Optional migration coordinator for dual-write detection\n59\t///\n60\t/// # Returns\n61\t/// A vector of node IDs that should receive the write. During dual-write for a shard,\n62\t/// this includes both the standard RF nodes AND the new node.\n63\tpub fn write_targets_with_migration(\n64\t shard_id: u32,\n65\t topology: &Topology,\n66\t migration_coordinator: Option<&MigrationCoordinator>,\n67\t) -> Vec {\n68\t let shard = ShardId(shard_id);\n69\t\n70\t // Start with standard write targets\n71\t let mut targets: Vec = write_targets(shard_id, topology);\n72\t\n73\t // Check if this shard is in dual-write phase\n74\t if let Some(coordinator) = migration_coordinator {\n75\t if coordinator.is_dual_write_active(shard) {\n76\t // Find migrations affecting this shard\n77\t for (_mid, state) in coordinator.get_all_migrations() {\n78\t if state.affected_shards.contains_key(&shard) {\n79\t // This shard is being migrated - include the new node\n80\t // Convert migration NodeId to topology NodeId\n81\t let new_node_id = crate::topology::NodeId::new(state.new_node.0.clone());\n82\t\n83\t // Only add if not already in targets\n84\t if !targets.contains(&new_node_id) {\n85\t targets.push(new_node_id);\n86\t }\n87\t }\n88\t }\n89\t }\n90\t }\n91\t\n92\t targets\n93\t}\n94\t\n95\t/// Select the replica group for a query (round-robin by query counter).\n96\t///\n97\t/// Returns 0 when there are no replica groups (caller handles the empty case).\n98\tpub fn query_group(query_seq: u64, replica_groups: u32) -> u32 {\n99\t if replica_groups == 0 {\n100\t return 0;\n101\t }\n102\t (query_seq % replica_groups as u64) as u32\n103\t}\n104\t\n105\t/// The covering set for a search: one node per shard within the chosen group.\n106\tpub fn covering_set(shard_count: u32, group: &Group, rf: usize, query_seq: u64) -> Vec {\n107\t (0..shard_count)\n108\t .map(|shard_id| {\n109\t let replicas = assign_shard_in_group(shard_id, group.nodes(), rf);\n110\t // rotate through replicas for intra-group load balancing\n111\t replicas[(query_seq as usize) % replicas.len()].clone()\n112\t })\n113\t .collect::>()\n114\t .into_iter()\n115\t .collect()\n116\t}\n117\t\n118\t/// Covering set with settings version floor filtering (plan §13.5).\n119\t///\n120\t/// Excludes nodes whose settings version for the given index is below `floor`.\n121\t/// Returns None if no covering set can be assembled (caller should return 503).\n122\tpub fn covering_set_with_version_floor(\n123\t shard_count: u32,\n124\t group: &Group,\n125\t rf: usize,\n126\t query_seq: u64,\n127\t index: &str,\n128\t floor: u64,\n129\t version_checker: &impl Fn(&str, &str) -> u64,\n130\t) -> Option> {\n131\t let mut result = Vec::new();\n132\t let mut used_nodes = HashSet::new();\n133\t\n134\t for shard_id in 0..shard_count {\n135\t let replicas = assign_shard_in_group(shard_id, group.nodes(), rf);\n136\t\n137\t // Filter replicas by settings version floor, then by query_seq rotation\n138\t let eligible: Vec<_> = replicas\n139\t .iter()\n140\t .filter(|node_id| {\n141\t let version = version_checker(index, node_id.as_str());\n142\t version >= floor\n143\t })\n144\t .collect();\n145\t\n146\t if eligible.is_empty() {\n147\t // No eligible replica for this shard\n148\t return None;\n149\t }\n150\t\n151\t // Rotate through eligible replicas using query_seq\n152\t let selected = eligible[query_seq as usize % eligible.len()];\n153\t if used_nodes.insert(selected.clone()) {\n154\t result.push(selected.clone());\n155\t }\n156\t }\n157\t\n158\t Some(result)\n159\t}\n160\t\n161\t/// Compute the shard ID for a document's primary key.\n162\tpub fn shard_for_key(primary_key: &str, shard_count: u32) -> u32 {\n163\t let mut h = XxHash64::with_seed(0);\n164\t primary_key.hash(&mut h);\n165\t (h.finish() % shard_count as u64) as u32\n166\t}\n167\t\n168\t/// Count differences between two shard assignments.\n169\t///\n170\t/// Returns the number of shard-node pairs that differ between old and new.\n171\t/// For each shard, counts nodes in new assignment that weren't in old.\n172\tpub fn count_assignment_diff(\n173\t old_shards: &[(u32, Vec)],\n174\t new_shards: &[(u32, Vec)],\n175\t) -> usize {\n176\t let old_map: std::collections::HashMap<_, _> = old_shards\n177\t .iter()\n178\t .map(|(shard, nodes)| (*shard, nodes.clone()))\n179\t .collect();\n180\t\n181\t let mut diff = 0;\n182\t for (shard, new_nodes) in new_shards {\n183\t if let Some(old_nodes) = old_map.get(shard) {\n184\t // Count nodes in new that weren't in old (counts each change once)\n185\t for node in new_nodes {\n186\t if !old_nodes.contains(node) {\n187\t diff += 1;\n188\t }\n189\t }\n190\t }\n191\t }\n192\t diff\n193\t}\n194\t\n195\t#[cfg(test)]\n196\tmod tests {\n197\t use super::*;\n198\t use crate::topology::{Node, NodeId};\n199\t use std::collections::HashMap;\n200\t\n201\t /// Test 1: Determinism — same inputs always produce the same output.\n202\t #[test]\n203\t fn test_determinism() {\n204\t let nodes = vec![\n205\t NodeId::new(\"node-a\".to_string()),\n206\t NodeId::new(\"node-b\".to_string()),\n207\t NodeId::new(\"node-c\".to_string()),\n208\t ];\n209\t\n210\t let reference = (0..100)\n211\t .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes, 2)))\n212\t .collect::>();\n213\t\n214\t // Run 1000 times and compare to reference\n215\t for _ in 0..1000 {\n216\t let current = (0..100)\n217\t .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes, 2)))\n218\t .collect::>();\n219\t\n220\t assert_eq!(reference, current, \"Assignment is non-deterministic\");\n221\t }\n222\t }\n223\t\n224\t /// Test 2: Reshuffle bound on add — 64 shards, 3→4 nodes.\n225\t ///\n226\t /// Expected: at most 2 × (1/4) × 64 = 32 shard-node edges differ.\n227\t #[test]\n228\t fn test_reshuffle_bound_on_add() {\n229\t let shard_count = 64;\n230\t let rf = 2;\n231\t\n232\t let nodes_3 = vec![\n233\t NodeId::new(\"node-a\".to_string()),\n234\t NodeId::new(\"node-b\".to_string()),\n235\t NodeId::new(\"node-c\".to_string()),\n236\t ];\n237\t\n238\t let mut nodes_4 = nodes_3.clone();\n239\t nodes_4.push(NodeId::new(\"node-d\".to_string()));\n240\t\n241\t let old_assignment: Vec<_> = (0..shard_count)\n242\t .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes_3, rf)))\n243\t .collect();\n244\t\n245\t let new_assignment: Vec<_> = (0..shard_count)\n246\t .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes_4, rf)))\n247\t .collect();\n248\t\n249\t let diff = count_assignment_diff(&old_assignment, &new_assignment);\n250\t let max_diff = 2 * (shard_count as f64 / 4.0).ceil() as usize;\n251\t\n252\t assert!(\n253\t diff <= max_diff,\n254\t \"Add reshuffle exceeded bound: {} > {}\",\n255\t diff,\n256\t max_diff\n257\t );\n258\t }\n259\t\n260\t /// Test 3: Reshuffle bound on remove — 64 shards, 4→3 nodes.\n261\t ///\n262\t /// Expected: ~RF × S / Ng edges differ.\n263\t #[test]\n264\t fn test_reshuffle_bound_on_remove() {\n265\t let shard_count = 64;\n266\t let rf = 2;\n267\t\n268\t let nodes_4 = vec![\n269\t NodeId::new(\"node-a\".to_string()),\n270\t NodeId::new(\"node-b\".to_string()),\n271\t NodeId::new(\"node-c\".to_string()),\n272\t NodeId::new(\"node-d\".to_string()),\n273\t ];\n274\t\n275\t let nodes_3 = vec![\n276\t NodeId::new(\"node-a\".to_string()),\n277\t NodeId::new(\"node-b\".to_string()),\n278\t NodeId::new(\"node-c\".to_string()),\n279\t ];\n280\t\n281\t let old_assignment: Vec<_> = (0..shard_count)\n282\t .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes_4, rf)))\n283\t .collect();\n284\t\n285\t let new_assignment: Vec<_> = (0..shard_count)\n286\t .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes_3, rf)))\n287\t .collect();\n288\t\n289\t let diff = count_assignment_diff(&old_assignment, &new_assignment);\n290\t // Expected ~RF × S / Ng = 2 × 64 / 4 = 32\n291\t let expected_diff = (rf * shard_count as usize) / 4;\n292\t\n293\t assert!(\n294\t (diff as isize - expected_diff as isize).abs() <= expected_diff as isize / 2,\n295\t \"Remove reshuffle deviated significantly from expected: {} vs ~{}\",\n296\t diff,\n297\t expected_diff\n298\t );\n299\t }\n300\t\n301\t /// Test 4: Uniformity — 64 shards, 3 nodes, RF=1.\n302\t ///\n303\t /// Expected: each node holds approximately equal shards (18–26 per plan §8 DoD).\n304\t #[test]\n305\t fn test_uniformity() {\n306\t let shard_count = 64;\n307\t let rf = 1;\n308\t\n309\t let nodes = vec![\n310\t NodeId::new(\"node-a\".to_string()),\n311\t NodeId::new(\"node-b\".to_string()),\n312\t NodeId::new(\"node-c\".to_string()),\n313\t ];\n314\t\n315\t let mut shard_counts: HashMap = HashMap::new();\n316\t for node in &nodes {\n317\t shard_counts.insert(node.clone(), 0);\n318\t }\n319\t\n320\t for shard_id in 0..shard_count {\n321\t let assigned = assign_shard_in_group(shard_id, &nodes, rf);\n322\t for node in assigned {\n323\t *shard_counts.entry(node).or_insert(0) += 1;\n324\t }\n325\t }\n326\t\n327\t // Expected per node: 64/3 ≈ 21.3\n328\t // Verified range: 17–26 (XxHash64 with 64 shards / 3 nodes)\n329\t for (node, count) in shard_counts {\n330\t assert!(\n331\t (17..=26).contains(&count),\n332\t \"Node {} has {} shards, expected 17–26\",\n333\t node.as_str(),\n334\t count\n335\t );\n336\t }\n337\t }\n338\t\n339\t /// Test 5: RF=2 placement — minimal change on add/remove.\n340\t #[test]\n341\t fn test_rf2_placement_stability() {\n342\t let shard_count = 64;\n343\t let rf = 2;\n344\t\n345\t let nodes_3 = vec![\n346\t NodeId::new(\"node-a\".to_string()),\n347\t NodeId::new(\"node-b\".to_string()),\n348\t NodeId::new(\"node-c\".to_string()),\n349\t ];\n350\t\n351\t let mut nodes_4 = nodes_3.clone();\n352\t nodes_4.push(NodeId::new(\"node-d\".to_string()));\n353\t\n354\t let old_assignment: Vec<_> = (0..shard_count)\n355\t .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes_3, rf)))\n356\t .collect();\n357\t\n358\t let new_assignment: Vec<_> = (0..shard_count)\n359\t .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes_4, rf)))\n360\t .collect();\n361\t\n362\t let diff = count_assignment_diff(&old_assignment, &new_assignment);\n363\t\n364\t // For RF=2, adding a node should affect at most 2 × (1/4) × 64 = 32 edges\n365\t let max_diff = 2 * (shard_count as f64 / 4.0).ceil() as usize;\n366\t\n367\t assert!(\n368\t diff <= max_diff,\n369\t \"RF=2 placement changed too much on add: {} > {}\",\n370\t diff,\n371\t max_diff\n372\t );\n373\t }\n374\t\n375\t /// Test 6: shard_for_key matches known fixture.\n376\t #[test]\n377\t fn test_shard_for_key_fixture() {\n378\t // Known test vectors computed with: XxHash64::with_seed(0).hash(pk) % shard_count\n379\t let fixtures: Vec<(&str, u32, u32)> = vec![\n380\t (\"user:123\", 64, 46),\n381\t (\"user:456\", 64, 48),\n382\t (\"product:abc\", 64, 24),\n383\t (\"order:xyz\", 64, 10),\n384\t (\"alpha\", 128, 104),\n385\t (\"beta\", 128, 91),\n386\t ];\n387\t\n388\t for (key, shard_count, expected) in fixtures {\n389\t let actual = shard_for_key(key, shard_count);\n390\t assert_eq!(\n391\t actual, expected,\n392\t \"shard_for_key({:?}, {}) = {}, expected {}\",\n393\t key, shard_count, actual, expected\n394\t );\n395\t }\n396\t }\n397\t\n398\t /// Test tie-breaking in assign_shard_in_group.\n399\t #[test]\n400\t fn test_tie_breaking() {\n401\t // Use node IDs that are unlikely but could theoretically collide\n402\t let nodes = vec![\n403\t NodeId::new(\"node-zzz\".to_string()),\n404\t NodeId::new(\"node-aaa\".to_string()),\n405\t ];\n406\t\n407\t let result = assign_shard_in_group(0, &nodes, 1);\n408\t\n409\t // Even if scores were identical (extremely rare), node-aaa should come first\n410\t // because we sort by node_id ascending for ties\n411\t assert_eq!(result.len(), 1);\n412\t // The actual result depends on hash values - we're just verifying determinism\n413\t let result2 = assign_shard_in_group(0, &nodes, 1);\n414\t assert_eq!(result, result2, \"Tie-breaking is non-deterministic\");\n415\t }\n416\t\n417\t /// Test score function uses canonical hash order.\n418\t #[test]\n419\t fn test_score_canonical_order() {\n420\t let node_a = \"node-a\";\n421\t let node_b = \"node-b\";\n422\t\n423\t // Different shard_id → different score\n424\t let score_0_a = score(0, node_a);\n425\t let score_1_a = score(1, node_a);\n426\t assert_ne!(score_0_a, score_1_a, \"Same node, different shard should differ\");\n427\t\n428\t // Different node_id → different score (same shard)\n429\t let score_0_b = score(0, node_b);\n430\t assert_ne!(score_0_a, score_0_b, \"Same shard, different node should differ\");\n431\t\n432\t // Verify determinism\n433\t assert_eq!(score(0, node_a), score_0_a, \"Score is non-deterministic\");\n434\t }\n435\t\n436\t // ── P1.3 acceptance tests: write_targets, query_group, covering_set ───\n437\t\n438\t /// P1.3-A1: write_targets returns exactly RG × RF nodes (counting duplicates).\n439\t #[test]\n440\t fn test_write_targets_returns_rg_x_rf_nodes() {\n441\t let mut topo = Topology::new(64, 3, 2);\n442\t // Add 5 nodes to each of 3 groups\n443\t for i in 0u32..15 {\n444\t let rg = i / 5;\n445\t topo.add_node(Node::new(\n446\t NodeId::new(format!(\"node-{i}\")),\n447\t format!(\"http://node-{i}:7700\"),\n448\t rg,\n449\t ));\n450\t }\n451\t\n452\t let targets = write_targets(0, &topo);\n453\t // RG=3, RF=2 → 6 nodes total (may include duplicates)\n454\t assert_eq!(targets.len(), 6, \"write_targets should return RG × RF nodes\");\n455\t }\n456\t\n457\t /// P1.3-A2: write_targets assigns one-per-group.\n458\t #[test]\n459\t fn test_write_targets_one_per_group() {\n460\t let mut topo = Topology::new(64, 2, 2);\n461\t // Group 0: nodes 0-2, Group 1: nodes 3-5\n462\t for i in 0u32..6 {\n463\t let rg = if i < 3 { 0 } else { 1 };\n464\t topo.add_node(Node::new(\n465\t NodeId::new(format!(\"node-{i}\")),\n466\t format!(\"http://node-{i}:7700\"),\n467\t rg,\n468\t ));\n469\t }\n470\t\n471\t let shard_id = 7;\n472\t let targets = write_targets(shard_id, &topo);\n473\t\n474\t // Verify that the subset in group 0 matches assign_shard_in_group\n475\t let g0 = topo.group(0).unwrap();\n476\t let g0_targets: Vec<_> = targets\n477\t .iter()\n478\t .filter(|n| g0.nodes().contains(n))\n479\t .collect();\n480\t let g0_expected = assign_shard_in_group(shard_id, g0.nodes(), 2);\n481\t assert_eq!(\n482\t g0_targets.len(),\n483\t g0_expected.len(),\n484\t \"Group 0 should have exactly RF nodes\"\n485\t );\n486\t for node in &g0_expected {\n487\t assert!(g0_targets.contains(&node), \"Group 0 missing expected node\");\n488\t }\n489\t\n490\t // Verify that the subset in group 1 matches assign_shard_in_group\n491\t let g1 = topo.group(1).unwrap();\n492\t let g1_targets: Vec<_> = targets\n493\t .iter()\n494\t .filter(|n| g1.nodes().contains(n))\n495\t .collect();\n496\t let g1_expected = assign_shard_in_group(shard_id, g1.nodes(), 2);\n497\t assert_eq!(\n498\t g1_targets.len(),\n499\t g1_expected.len(),\n500\t \"Group 1 should have exactly RF nodes\"\n501\t );\n502\t for node in &g1_expected {\n503\t assert!(g1_targets.contains(&node), \"Group 1 missing expected node\");\n504\t }\n505\t }\n506\t\n507\t /// P1.3-A3: covering_set covers all shards within the chosen group.\n508\t #[test]\n509\t fn test_covering_set_covers_all_shards() {\n510\t let mut topo = Topology::new(16, 1, 2);\n511\t for i in 0u32..4 {\n512\t topo.add_node(Node::new(\n513\t NodeId::new(format!(\"node-{i}\")),\n514\t format!(\"http://node-{i}:7700\"),\n515\t 0,\n516\t ));\n517\t }\n518\t\n519\t let group = topo.group(0).unwrap();\n520\t let shard_count = 16;\n521\t let covering = covering_set(shard_count, group, 2, 0);\n522\t\n523\t // Verify that every shard is represented in the covering set\n524\t for shard_id in 0..shard_count {\n525\t let replicas = assign_shard_in_group(shard_id, group.nodes(), 2);\n526\t let selected = &replicas[0]; // query_seq=0 → first replica\n527\t assert!(\n528\t covering.contains(selected),\n529\t \"Shard {}'s selected node {:?} not in covering set\",\n530\t shard_id,\n531\t selected\n532\t );\n533\t }\n534\t }\n535\t\n536\t /// P1.3-A4: covering_set size is bounded by Ng (nodes in group).\n537\t #[test]\n538\t fn test_covering_set_size_bound() {\n539\t let mut topo = Topology::new(1000, 1, 3);\n540\t for i in 0u32..5 {\n541\t topo.add_node(Node::new(\n542\t NodeId::new(format!(\"node-{i}\")),\n543\t format!(\"http://node-{i}:7700\"),\n544\t 0,\n545\t ));\n546\t }\n547\t\n548\t let group = topo.group(0).unwrap();\n549\t let ng = group.node_count();\n550\t let covering = covering_set(1000, group, 3, 0);\n551\t\n552\t assert!(\n553\t covering.len() <= ng,\n554\t \"covering_set size {} exceeds group node count {}\",\n555\t covering.len(),\n556\t ng\n557\t );\n558\t }\n559\t\n560\t /// P1.3-A5: Two identical Topologies produce identical covering_set outputs.\n561\t #[test]\n562\t fn test_covering_set_determinism() {\n563\t let mut topo1 = Topology::new(64, 2, 2);\n564\t let mut topo2 = Topology::new(64, 2, 2);\n565\t\n566\t for i in 0u32..6 {\n567\t let rg = if i < 3 { 0 } else { 1 };\n568\t let node = Node::new(\n569\t NodeId::new(format!(\"node-{i}\")),\n570\t format!(\"http://node-{i}:7700\"),\n571\t rg,\n572\t );\n573\t topo1.add_node(node.clone());\n574\t topo2.add_node(node);\n575\t }\n576\t\n577\t let g1 = topo1.group(0).unwrap();\n578\t let g2 = topo2.group(0).unwrap();\n579\t\n580\t for query_seq in 0..10 {\n581\t let c1 = covering_set(64, g1, 2, query_seq);\n582\t let c2 = covering_set(64, g2, 2, query_seq);\n583\t // Compare as sets since order may vary due to HashSet iteration\n584\t let s1: std::collections::HashSet<_> = c1.into_iter().collect();\n585\t let s2: std::collections::HashSet<_> = c2.into_iter().collect();\n586\t assert_eq!(\n587\t s1, s2,\n588\t \"covering_set differs for identical topologies at query_seq={}\",\n589\t query_seq\n590\t );\n591\t }\n592\t }\n593\t\n594\t /// P1.3-A6: query_group distribution is uniform (chi-square test).\n595\t #[test]\n596\t fn test_query_group_uniform_distribution() {\n597\t let replica_groups = 5u32;\n598\t let samples = 10_000;\n599\t\n600\t let mut counts = vec![0usize; replica_groups as usize];\n601\t for query_seq in 0..samples {\n602\t let g = query_group(query_seq as u64, replica_groups);\n603\t counts[g as usize] += 1;\n604\t }\n605\t\n606\t // Expected count per group: samples / RG\n607\t let expected = samples as f64 / replica_groups as f64;\n608\t\n609\t // Chi-square statistic: sum((observed - expected)^2 / expected)\n610\t let chi_square: f64 = counts\n611\t .iter()\n612\t .map(|&observed| {\n613\t let diff = observed as f64 - expected;\n614\t (diff * diff) / expected\n615\t })\n616\t .sum();\n617\t\n618\t // Degrees of freedom = RG - 1 = 4\n619\t // Critical value at p=0.95 is ~9.49\n620\t let critical_value = 9.49;\n621\t\n622\t assert!(\n623\t chi_square < critical_value,\n624\t \"query_group distribution not uniform: chi-square={} > {}\",\n625\t chi_square,\n626\t critical_value\n627\t );\n628\t }\n629\t\n630\t /// P1.3-A7: covering_set rotates replicas by query_seq.\n631\t #[test]\n632\t fn test_covering_set_rotates_replicas() {\n633\t let mut topo = Topology::new(8, 1, 3);\n634\t for i in 0u32..4 {\n635\t topo.add_node(Node::new(\n636\t NodeId::new(format!(\"node-{i}\")),\n637\t format!(\"http://node-{i}:7700\"),\n638\t 0,\n639\t ));\n640\t }\n641\t\n642\t let group = topo.group(0).unwrap();\n643\t let c0 = covering_set(8, group, 3, 0);\n644\t let c1 = covering_set(8, group, 3, 1);\n645\t let c2 = covering_set(8, group, 3, 2);\n646\t\n647\t // For each shard, verify that the selected node rotates\n648\t for shard_id in 0..8 {\n649\t let replicas = assign_shard_in_group(shard_id, group.nodes(), 3);\n650\t let r0 = &replicas[0];\n651\t let r1 = &replicas[1];\n652\t let r2 = &replicas[2];\n653\t\n654\t assert!(c0.contains(r0), \"query_seq=0 should select first replica\");\n655\t assert!(c1.contains(r1), \"query_seq=1 should select second replica\");\n656\t assert!(c2.contains(r2), \"query_seq=2 should select third replica\");\n657\t }\n658\t }\n659\t}\n660\t"}]},"parent_tool_use_id":null,"session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","uuid":"049cb186-711a-4ae3-aa55-9ec58c11f272","timestamp":"2026-05-23T05:58:08.058Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/crates/miroir-core/src/router.rs","content":"//! Rendezvous hash-based routing and shard assignment.\n\nuse crate::migration::{MigrationCoordinator, ShardId};\nuse crate::topology::{Group, NodeId, Topology};\nuse std::collections::HashSet;\nuse std::hash::{Hash, Hasher};\nuse twox_hash::XxHash64;\n\n/// Compute a rendezvous score for a shard+node pair.\n///\n/// Higher scores win; used for deterministic shard assignment.\npub fn score(shard_id: u32, node_id: &str) -> u64 {\n let mut h = XxHash64::with_seed(0);\n shard_id.hash(&mut h);\n node_id.hash(&mut h);\n h.finish()\n}\n\n/// Assign a shard to `rf` nodes within a single replica group.\n///\n/// `group_nodes` is the subset of nodes belonging to that group.\n///\n/// Sorts by score descending, breaking ties lexicographically on node_id\n/// for deterministic resolution.\npub fn assign_shard_in_group(shard_id: u32, group_nodes: &[NodeId], rf: usize) -> Vec {\n let mut scored: Vec<(u64, &NodeId)> = group_nodes\n .iter()\n .map(|n| (score(shard_id, n.as_str()), n))\n .collect();\n scored.sort_unstable_by(|a, b| {\n b.0.cmp(&a.0)\n .then_with(|| a.1.as_str().cmp(b.1.as_str()))\n });\n scored\n .into_iter()\n .take(rf)\n .map(|(_, n)| n.clone())\n .collect()\n}\n\n/// All write targets for a document: the RF nodes in EACH replica group.\npub fn write_targets(shard_id: u32, topology: &Topology) -> Vec {\n topology\n .groups()\n .flat_map(|group| assign_shard_in_group(shard_id, group.nodes(), topology.rf()))\n .collect()\n}\n\n/// All write targets for a document, considering dual-write state during migration.\n///\n/// This is the migration-aware version of `write_targets`. When a shard is in\n/// dual-write phase (node addition in progress), it includes both the old owner\n/// AND the new node in the target list to ensure no writes are lost during migration.\n///\n/// # Arguments\n/// * `shard_id` - The shard ID being written to\n/// * `topology` - The cluster topology\n/// * `migration_coordinator` - Optional migration coordinator for dual-write detection\n///\n/// # Returns\n/// A vector of node IDs that should receive the write. During dual-write for a shard,\n/// this includes both the standard RF nodes AND the new node.\npub fn write_targets_with_migration(\n shard_id: u32,\n topology: &Topology,\n migration_coordinator: Option<&MigrationCoordinator>,\n) -> Vec {\n let shard = ShardId(shard_id);\n\n // Start with standard write targets\n let mut targets: Vec = write_targets(shard_id, topology);\n\n // Check if this shard is in dual-write phase\n if let Some(coordinator) = migration_coordinator {\n if coordinator.is_dual_write_active(shard) {\n // Find migrations affecting this shard\n for (_mid, state) in coordinator.get_all_migrations() {\n if state.affected_shards.contains_key(&shard) {\n // This shard is being migrated - include the new node\n // Convert migration NodeId to topology NodeId\n let new_node_id = crate::topology::NodeId::new(state.new_node.0.clone());\n\n // Only add if not already in targets\n if !targets.contains(&new_node_id) {\n targets.push(new_node_id);\n }\n }\n }\n }\n }\n\n targets\n}\n\n/// Select the replica group for a query (round-robin by query counter).\n///\n/// Returns 0 when there are no replica groups (caller handles the empty case).\npub fn query_group(query_seq: u64, replica_groups: u32) -> u32 {\n if replica_groups == 0 {\n return 0;\n }\n (query_seq % replica_groups as u64) as u32\n}\n\n/// The covering set for a search: one node per shard within the chosen group.\npub fn covering_set(shard_count: u32, group: &Group, rf: usize, query_seq: u64) -> Vec {\n (0..shard_count)\n .map(|shard_id| {\n let replicas = assign_shard_in_group(shard_id, group.nodes(), rf);\n // rotate through replicas for intra-group load balancing\n replicas[(query_seq as usize) % replicas.len()].clone()\n })\n .collect::>()\n .into_iter()\n .collect()\n}\n\n/// Covering set with settings version floor filtering (plan §13.5).\n///\n/// Excludes nodes whose settings version for the given index is below `floor`.\n/// Returns None if no covering set can be assembled (caller should return 503).\npub fn covering_set_with_version_floor(\n shard_count: u32,\n group: &Group,\n rf: usize,\n query_seq: u64,\n index: &str,\n floor: u64,\n version_checker: &impl Fn(&str, &str) -> u64,\n) -> Option> {\n let mut result = Vec::new();\n let mut used_nodes = HashSet::new();\n\n for shard_id in 0..shard_count {\n let replicas = assign_shard_in_group(shard_id, group.nodes(), rf);\n\n // Filter replicas by settings version floor, then by query_seq rotation\n let eligible: Vec<_> = replicas\n .iter()\n .filter(|node_id| {\n let version = version_checker(index, node_id.as_str());\n version >= floor\n })\n .collect();\n\n if eligible.is_empty() {\n // No eligible replica for this shard\n return None;\n }\n\n // Rotate through eligible replicas using query_seq\n let selected = eligible[query_seq as usize % eligible.len()];\n if used_nodes.insert(selected.clone()) {\n result.push(selected.clone());\n }\n }\n\n Some(result)\n}\n\n/// Compute the shard ID for a document's primary key.\npub fn shard_for_key(primary_key: &str, shard_count: u32) -> u32 {\n let mut h = XxHash64::with_seed(0);\n primary_key.hash(&mut h);\n (h.finish() % shard_count as u64) as u32\n}\n\n/// Count differences between two shard assignments.\n///\n/// Returns the number of shard-node pairs that differ between old and new.\n/// For each shard, counts nodes in new assignment that weren't in old.\npub fn count_assignment_diff(\n old_shards: &[(u32, Vec)],\n new_shards: &[(u32, Vec)],\n) -> usize {\n let old_map: std::collections::HashMap<_, _> = old_shards\n .iter()\n .map(|(shard, nodes)| (*shard, nodes.clone()))\n .collect();\n\n let mut diff = 0;\n for (shard, new_nodes) in new_shards {\n if let Some(old_nodes) = old_map.get(shard) {\n // Count nodes in new that weren't in old (counts each change once)\n for node in new_nodes {\n if !old_nodes.contains(node) {\n diff += 1;\n }\n }\n }\n }\n diff\n}\n\n#[cfg(test)]\nmod tests {\n use super::*;\n use crate::topology::{Node, NodeId};\n use std::collections::HashMap;\n\n /// Test 1: Determinism — same inputs always produce the same output.\n #[test]\n fn test_determinism() {\n let nodes = vec![\n NodeId::new(\"node-a\".to_string()),\n NodeId::new(\"node-b\".to_string()),\n NodeId::new(\"node-c\".to_string()),\n ];\n\n let reference = (0..100)\n .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes, 2)))\n .collect::>();\n\n // Run 1000 times and compare to reference\n for _ in 0..1000 {\n let current = (0..100)\n .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes, 2)))\n .collect::>();\n\n assert_eq!(reference, current, \"Assignment is non-deterministic\");\n }\n }\n\n /// Test 2: Reshuffle bound on add — 64 shards, 3→4 nodes.\n ///\n /// Expected: at most 2 × (1/4) × 64 = 32 shard-node edges differ.\n #[test]\n fn test_reshuffle_bound_on_add() {\n let shard_count = 64;\n let rf = 2;\n\n let nodes_3 = vec![\n NodeId::new(\"node-a\".to_string()),\n NodeId::new(\"node-b\".to_string()),\n NodeId::new(\"node-c\".to_string()),\n ];\n\n let mut nodes_4 = nodes_3.clone();\n nodes_4.push(NodeId::new(\"node-d\".to_string()));\n\n let old_assignment: Vec<_> = (0..shard_count)\n .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes_3, rf)))\n .collect();\n\n let new_assignment: Vec<_> = (0..shard_count)\n .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes_4, rf)))\n .collect();\n\n let diff = count_assignment_diff(&old_assignment, &new_assignment);\n let max_diff = 2 * (shard_count as f64 / 4.0).ceil() as usize;\n\n assert!(\n diff <= max_diff,\n \"Add reshuffle exceeded bound: {} > {}\",\n diff,\n max_diff\n );\n }\n\n /// Test 3: Reshuffle bound on remove — 64 shards, 4→3 nodes.\n ///\n /// Expected: ~RF × S / Ng edges differ.\n #[test]\n fn test_reshuffle_bound_on_remove() {\n let shard_count = 64;\n let rf = 2;\n\n let nodes_4 = vec![\n NodeId::new(\"node-a\".to_string()),\n NodeId::new(\"node-b\".to_string()),\n NodeId::new(\"node-c\".to_string()),\n NodeId::new(\"node-d\".to_string()),\n ];\n\n let nodes_3 = vec![\n NodeId::new(\"node-a\".to_string()),\n NodeId::new(\"node-b\".to_string()),\n NodeId::new(\"node-c\".to_string()),\n ];\n\n let old_assignment: Vec<_> = (0..shard_count)\n .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes_4, rf)))\n .collect();\n\n let new_assignment: Vec<_> = (0..shard_count)\n .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes_3, rf)))\n .collect();\n\n let diff = count_assignment_diff(&old_assignment, &new_assignment);\n // Expected ~RF × S / Ng = 2 × 64 / 4 = 32\n let expected_diff = (rf * shard_count as usize) / 4;\n\n assert!(\n (diff as isize - expected_diff as isize).abs() <= expected_diff as isize / 2,\n \"Remove reshuffle deviated significantly from expected: {} vs ~{}\",\n diff,\n expected_diff\n );\n }\n\n /// Test 4: Uniformity — 64 shards, 3 nodes, RF=1.\n ///\n /// Expected: each node holds approximately equal shards (18–26 per plan §8 DoD).\n #[test]\n fn test_uniformity() {\n let shard_count = 64;\n let rf = 1;\n\n let nodes = vec![\n NodeId::new(\"node-a\".to_string()),\n NodeId::new(\"node-b\".to_string()),\n NodeId::new(\"node-c\".to_string()),\n ];\n\n let mut shard_counts: HashMap = HashMap::new();\n for node in &nodes {\n shard_counts.insert(node.clone(), 0);\n }\n\n for shard_id in 0..shard_count {\n let assigned = assign_shard_in_group(shard_id, &nodes, rf);\n for node in assigned {\n *shard_counts.entry(node).or_insert(0) += 1;\n }\n }\n\n // Expected per node: 64/3 ≈ 21.3\n // Verified range: 17–26 (XxHash64 with 64 shards / 3 nodes)\n for (node, count) in shard_counts {\n assert!(\n (17..=26).contains(&count),\n \"Node {} has {} shards, expected 17–26\",\n node.as_str(),\n count\n );\n }\n }\n\n /// Test 5: RF=2 placement — minimal change on add/remove.\n #[test]\n fn test_rf2_placement_stability() {\n let shard_count = 64;\n let rf = 2;\n\n let nodes_3 = vec![\n NodeId::new(\"node-a\".to_string()),\n NodeId::new(\"node-b\".to_string()),\n NodeId::new(\"node-c\".to_string()),\n ];\n\n let mut nodes_4 = nodes_3.clone();\n nodes_4.push(NodeId::new(\"node-d\".to_string()));\n\n let old_assignment: Vec<_> = (0..shard_count)\n .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes_3, rf)))\n .collect();\n\n let new_assignment: Vec<_> = (0..shard_count)\n .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes_4, rf)))\n .collect();\n\n let diff = count_assignment_diff(&old_assignment, &new_assignment);\n\n // For RF=2, adding a node should affect at most 2 × (1/4) × 64 = 32 edges\n let max_diff = 2 * (shard_count as f64 / 4.0).ceil() as usize;\n\n assert!(\n diff <= max_diff,\n \"RF=2 placement changed too much on add: {} > {}\",\n diff,\n max_diff\n );\n }\n\n /// Test 6: shard_for_key matches known fixture.\n #[test]\n fn test_shard_for_key_fixture() {\n // Known test vectors computed with: XxHash64::with_seed(0).hash(pk) % shard_count\n let fixtures: Vec<(&str, u32, u32)> = vec![\n (\"user:123\", 64, 46),\n (\"user:456\", 64, 48),\n (\"product:abc\", 64, 24),\n (\"order:xyz\", 64, 10),\n (\"alpha\", 128, 104),\n (\"beta\", 128, 91),\n ];\n\n for (key, shard_count, expected) in fixtures {\n let actual = shard_for_key(key, shard_count);\n assert_eq!(\n actual, expected,\n \"shard_for_key({:?}, {}) = {}, expected {}\",\n key, shard_count, actual, expected\n );\n }\n }\n\n /// Test tie-breaking in assign_shard_in_group.\n #[test]\n fn test_tie_breaking() {\n // Use node IDs that are unlikely but could theoretically collide\n let nodes = vec![\n NodeId::new(\"node-zzz\".to_string()),\n NodeId::new(\"node-aaa\".to_string()),\n ];\n\n let result = assign_shard_in_group(0, &nodes, 1);\n\n // Even if scores were identical (extremely rare), node-aaa should come first\n // because we sort by node_id ascending for ties\n assert_eq!(result.len(), 1);\n // The actual result depends on hash values - we're just verifying determinism\n let result2 = assign_shard_in_group(0, &nodes, 1);\n assert_eq!(result, result2, \"Tie-breaking is non-deterministic\");\n }\n\n /// Test score function uses canonical hash order.\n #[test]\n fn test_score_canonical_order() {\n let node_a = \"node-a\";\n let node_b = \"node-b\";\n\n // Different shard_id → different score\n let score_0_a = score(0, node_a);\n let score_1_a = score(1, node_a);\n assert_ne!(score_0_a, score_1_a, \"Same node, different shard should differ\");\n\n // Different node_id → different score (same shard)\n let score_0_b = score(0, node_b);\n assert_ne!(score_0_a, score_0_b, \"Same shard, different node should differ\");\n\n // Verify determinism\n assert_eq!(score(0, node_a), score_0_a, \"Score is non-deterministic\");\n }\n\n // ── P1.3 acceptance tests: write_targets, query_group, covering_set ───\n\n /// P1.3-A1: write_targets returns exactly RG × RF nodes (counting duplicates).\n #[test]\n fn test_write_targets_returns_rg_x_rf_nodes() {\n let mut topo = Topology::new(64, 3, 2);\n // Add 5 nodes to each of 3 groups\n for i in 0u32..15 {\n let rg = i / 5;\n topo.add_node(Node::new(\n NodeId::new(format!(\"node-{i}\")),\n format!(\"http://node-{i}:7700\"),\n rg,\n ));\n }\n\n let targets = write_targets(0, &topo);\n // RG=3, RF=2 → 6 nodes total (may include duplicates)\n assert_eq!(targets.len(), 6, \"write_targets should return RG × RF nodes\");\n }\n\n /// P1.3-A2: write_targets assigns one-per-group.\n #[test]\n fn test_write_targets_one_per_group() {\n let mut topo = Topology::new(64, 2, 2);\n // Group 0: nodes 0-2, Group 1: nodes 3-5\n for i in 0u32..6 {\n let rg = if i < 3 { 0 } else { 1 };\n topo.add_node(Node::new(\n NodeId::new(format!(\"node-{i}\")),\n format!(\"http://node-{i}:7700\"),\n rg,\n ));\n }\n\n let shard_id = 7;\n let targets = write_targets(shard_id, &topo);\n\n // Verify that the subset in group 0 matches assign_shard_in_group\n let g0 = topo.group(0).unwrap();\n let g0_targets: Vec<_> = targets\n .iter()\n .filter(|n| g0.nodes().contains(n))\n .collect();\n let g0_expected = assign_shard_in_group(shard_id, g0.nodes(), 2);\n assert_eq!(\n g0_targets.len(),\n g0_expected.len(),\n \"Group 0 should have exactly RF nodes\"\n );\n for node in &g0_expected {\n assert!(g0_targets.contains(&node), \"Group 0 missing expected node\");\n }\n\n // Verify that the subset in group 1 matches assign_shard_in_group\n let g1 = topo.group(1).unwrap();\n let g1_targets: Vec<_> = targets\n .iter()\n .filter(|n| g1.nodes().contains(n))\n .collect();\n let g1_expected = assign_shard_in_group(shard_id, g1.nodes(), 2);\n assert_eq!(\n g1_targets.len(),\n g1_expected.len(),\n \"Group 1 should have exactly RF nodes\"\n );\n for node in &g1_expected {\n assert!(g1_targets.contains(&node), \"Group 1 missing expected node\");\n }\n }\n\n /// P1.3-A3: covering_set covers all shards within the chosen group.\n #[test]\n fn test_covering_set_covers_all_shards() {\n let mut topo = Topology::new(16, 1, 2);\n for i in 0u32..4 {\n topo.add_node(Node::new(\n NodeId::new(format!(\"node-{i}\")),\n format!(\"http://node-{i}:7700\"),\n 0,\n ));\n }\n\n let group = topo.group(0).unwrap();\n let shard_count = 16;\n let covering = covering_set(shard_count, group, 2, 0);\n\n // Verify that every shard is represented in the covering set\n for shard_id in 0..shard_count {\n let replicas = assign_shard_in_group(shard_id, group.nodes(), 2);\n let selected = &replicas[0]; // query_seq=0 → first replica\n assert!(\n covering.contains(selected),\n \"Shard {}'s selected node {:?} not in covering set\",\n shard_id,\n selected\n );\n }\n }\n\n /// P1.3-A4: covering_set size is bounded by Ng (nodes in group).\n #[test]\n fn test_covering_set_size_bound() {\n let mut topo = Topology::new(1000, 1, 3);\n for i in 0u32..5 {\n topo.add_node(Node::new(\n NodeId::new(format!(\"node-{i}\")),\n format!(\"http://node-{i}:7700\"),\n 0,\n ));\n }\n\n let group = topo.group(0).unwrap();\n let ng = group.node_count();\n let covering = covering_set(1000, group, 3, 0);\n\n assert!(\n covering.len() <= ng,\n \"covering_set size {} exceeds group node count {}\",\n covering.len(),\n ng\n );\n }\n\n /// P1.3-A5: Two identical Topologies produce identical covering_set outputs.\n #[test]\n fn test_covering_set_determinism() {\n let mut topo1 = Topology::new(64, 2, 2);\n let mut topo2 = Topology::new(64, 2, 2);\n\n for i in 0u32..6 {\n let rg = if i < 3 { 0 } else { 1 };\n let node = Node::new(\n NodeId::new(format!(\"node-{i}\")),\n format!(\"http://node-{i}:7700\"),\n rg,\n );\n topo1.add_node(node.clone());\n topo2.add_node(node);\n }\n\n let g1 = topo1.group(0).unwrap();\n let g2 = topo2.group(0).unwrap();\n\n for query_seq in 0..10 {\n let c1 = covering_set(64, g1, 2, query_seq);\n let c2 = covering_set(64, g2, 2, query_seq);\n // Compare as sets since order may vary due to HashSet iteration\n let s1: std::collections::HashSet<_> = c1.into_iter().collect();\n let s2: std::collections::HashSet<_> = c2.into_iter().collect();\n assert_eq!(\n s1, s2,\n \"covering_set differs for identical topologies at query_seq={}\",\n query_seq\n );\n }\n }\n\n /// P1.3-A6: query_group distribution is uniform (chi-square test).\n #[test]\n fn test_query_group_uniform_distribution() {\n let replica_groups = 5u32;\n let samples = 10_000;\n\n let mut counts = vec![0usize; replica_groups as usize];\n for query_seq in 0..samples {\n let g = query_group(query_seq as u64, replica_groups);\n counts[g as usize] += 1;\n }\n\n // Expected count per group: samples / RG\n let expected = samples as f64 / replica_groups as f64;\n\n // Chi-square statistic: sum((observed - expected)^2 / expected)\n let chi_square: f64 = counts\n .iter()\n .map(|&observed| {\n let diff = observed as f64 - expected;\n (diff * diff) / expected\n })\n .sum();\n\n // Degrees of freedom = RG - 1 = 4\n // Critical value at p=0.95 is ~9.49\n let critical_value = 9.49;\n\n assert!(\n chi_square < critical_value,\n \"query_group distribution not uniform: chi-square={} > {}\",\n chi_square,\n critical_value\n );\n }\n\n /// P1.3-A7: covering_set rotates replicas by query_seq.\n #[test]\n fn test_covering_set_rotates_replicas() {\n let mut topo = Topology::new(8, 1, 3);\n for i in 0u32..4 {\n topo.add_node(Node::new(\n NodeId::new(format!(\"node-{i}\")),\n format!(\"http://node-{i}:7700\"),\n 0,\n ));\n }\n\n let group = topo.group(0).unwrap();\n let c0 = covering_set(8, group, 3, 0);\n let c1 = covering_set(8, group, 3, 1);\n let c2 = covering_set(8, group, 3, 2);\n\n // For each shard, verify that the selected node rotates\n for shard_id in 0..8 {\n let replicas = assign_shard_in_group(shard_id, group.nodes(), 3);\n let r0 = &replicas[0];\n let r1 = &replicas[1];\n let r2 = &replicas[2];\n\n assert!(c0.contains(r0), \"query_seq=0 should select first replica\");\n assert!(c1.contains(r1), \"query_seq=1 should select second replica\");\n assert!(c2.contains(r2), \"query_seq=2 should select third replica\");\n }\n }\n}\n","numLines":660,"startLine":1,"totalLines":660}}} -{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_468ac863a0974f35a63e547f","type":"tool_result","content":"1\t//! Rebalancer background worker with advisory lock.\n2\t//!\n3\t//! Implements plan §4 \"Rebalancer\" background task:\n4\t//! - Advisory lock via leader_lease (only one pod runs the rebalancer)\n5\t//! - Reacts to topology change events (node add/drain/fail/recover)\n6\t//! - Computes affected shards using the Phase 1 router\n7\t//! - Drives the migration state machine for each affected shard\n8\t//! - Updates Prometheus metrics (plan §10)\n9\t//! - Progress persistence via jobs table for resumability\n10\t\n11\tmod drift_reconciler;\n12\t\n13\t#[cfg(test)]\n14\tmod acceptance_tests;\n15\t\n16\t#[cfg(test)]\n17\tmod settings_broadcast_acceptance_tests;\n18\t\n19\tpub use drift_reconciler::{DriftReconciler, DriftReconcilerConfig};\n20\t\n21\tuse crate::migration::{MigrationCoordinator, MigrationId, MigrationNodeId, ShardId};\n22\tuse crate::rebalancer::{MigrationExecutor, Rebalancer, RebalancerMetrics};\n23\tuse crate::router::assign_shard_in_group;\n24\tuse crate::task_store::{NewJob, TaskStore};\n25\tuse crate::topology::{NodeId as TopologyNodeId, Topology};\n26\tuse serde::{Deserialize, Serialize};\n27\tuse std::collections::HashMap;\n28\tuse std::sync::Arc;\n29\tuse std::time::{Duration, Instant};\n30\tuse tokio::sync::{mpsc, RwLock};\n31\tuse tracing::{debug, error, info};\n32\t\n33\t/// Callback type for recording rebalancer metrics.\n34\t///\n35\t/// Called when:\n36\t/// - Documents are migrated (count)\n37\t/// - Rebalance starts (in_progress = true)\n38\t/// - Rebalance ends (in_progress = false, duration_secs)\n39\tpub type RebalancerMetricsCallback = Arc, Option) + Send + Sync>;\n40\t\n41\t/// Default leader lease TTL in seconds.\n42\tconst LEASE_TTL_SECS: u64 = 10;\n43\t\n44\t/// Default interval for lease renewal checks.\n45\tconst LEASE_RENEWAL_INTERVAL_MS: u64 = 2000;\n46\t\n47\t/// Maximum time to wait for a migration job to complete.\n48\tconst MIGRATION_TIMEOUT_SECS: u64 = 3600;\n49\t\n50\t/// Unique identifier for a rebalance job (per index).\n51\t#[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]\n52\tpub struct RebalanceJobId(pub String);\n53\t\n54\timpl RebalanceJobId {\n55\t /// Create a new rebalance job ID for an index.\n56\t pub fn new(index_uid: &str) -> Self {\n57\t Self(format!(\"rebalance:{}\", index_uid))\n58\t }\n59\t\n60\t /// Get the index UID from the job ID.\n61\t pub fn index_uid(&self) -> &str {\n62\t self.0.strip_prefix(\"rebalance:\").unwrap_or(&self.0)\n63\t }\n64\t}\n65\t\n66\t/// Topology change event that triggers rebalancing.\n67\t#[derive(Debug, Clone, Serialize, Deserialize)]\n68\tpub enum TopologyChangeEvent {\n69\t /// A new node was added to a replica group.\n70\t NodeAdded {\n71\t node_id: String,\n72\t replica_group: u32,\n73\t index_uid: String,\n74\t },\n75\t /// A node is being drained (preparing for removal).\n76\t NodeDraining {\n77\t node_id: String,\n78\t replica_group: u32,\n79\t index_uid: String,\n80\t },\n81\t /// A node failed and needs recovery.\n82\t NodeFailed {\n83\t node_id: String,\n84\t replica_group: u32,\n85\t index_uid: String,\n86\t },\n87\t /// A node recovered after failure.\n88\t NodeRecovered {\n89\t node_id: String,\n90\t replica_group: u32,\n91\t index_uid: String,\n92\t },\n93\t}\n94\t\n95\t/// Per-shard migration progress for persistence.\n96\t#[derive(Debug, Clone, Serialize, Deserialize)]\n97\tpub struct ShardMigrationProgress {\n98\t /// Shard ID.\n99\t pub shard_id: u32,\n100\t /// Current phase.\n101\t pub phase: String,\n102\t /// Documents migrated so far.\n103\t pub docs_migrated: u64,\n104\t /// Last offset for pagination resume.\n105\t pub last_offset: u32,\n106\t /// Source node for migration.\n107\t pub source_node: Option,\n108\t /// Target node for migration.\n109\t pub target_node: String,\n110\t}\n111\t\n112\t/// Per-shard migration state for the worker.\n113\t#[derive(Debug, Clone, Serialize, Deserialize)]\n114\tstruct ShardState {\n115\t /// Current phase.\n116\t phase: ShardMigrationPhase,\n117\t /// Documents migrated so far.\n118\t docs_migrated: u64,\n119\t /// Last offset for pagination resume.\n120\t last_offset: u32,\n121\t /// Source node for migration.\n122\t source_node: Option,\n123\t /// Target node for migration.\n124\t target_node: String,\n125\t /// When this shard migration started.\n126\t #[serde(skip, default = \"Instant::now\")]\n127\t started_at: Instant,\n128\t}\n129\t\n130\t/// Migration phases for a single shard.\n131\t#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]\n132\tpub enum ShardMigrationPhase {\n133\t /// Waiting to start.\n134\t Idle,\n135\t /// Dual-write active.\n136\t DualWriteStarted,\n137\t /// Background migration in progress.\n138\t MigrationInProgress,\n139\t /// Migration complete, preparing cutover.\n140\t MigrationComplete,\n141\t /// Dual-write stopped.\n142\t DualWriteStopped,\n143\t /// Old replica deleted.\n144\t OldReplicaDeleted,\n145\t /// Migration failed.\n146\t Failed,\n147\t}\n148\t\n149\t/// State machine for a rebalance job (per index).\n150\t#[derive(Debug, Clone, Serialize, Deserialize)]\n151\tstruct RebalanceJob {\n152\t /// Job ID.\n153\t id: RebalanceJobId,\n154\t /// Index UID being rebalanced.\n155\t index_uid: String,\n156\t /// Replica group being rebalanced.\n157\t replica_group: u32,\n158\t /// Per-shard migration state.\n159\t shards: HashMap,\n160\t /// Job started at.\n161\t #[serde(skip, default = \"Instant::now\")]\n162\t started_at: Instant,\n163\t /// Job completed at (if finished).\n164\t #[serde(skip, default)]\n165\t completed_at: Option,\n166\t /// Total documents migrated.\n167\t total_docs_migrated: u64,\n168\t /// Whether the job is paused.\n169\t paused: bool,\n170\t}\n171\t\n172\t/// Configuration for the rebalancer worker.\n173\t#[derive(Debug, Clone, Serialize, Deserialize)]\n174\tpub struct RebalancerWorkerConfig {\n175\t /// Maximum concurrent migrations (plan §14.2 memory budget).\n176\t pub max_concurrent_migrations: u32,\n177\t /// Leader lease TTL in seconds.\n178\t pub lease_ttl_secs: u64,\n179\t /// Lease renewal interval in milliseconds.\n180\t pub lease_renewal_interval_ms: u64,\n181\t /// Migration batch size.\n182\t pub migration_batch_size: u32,\n183\t /// Delay between migration batches (ms).\n184\t pub migration_batch_delay_ms: u64,\n185\t /// Channel capacity for topology events.\n186\t pub event_channel_capacity: usize,\n187\t}\n188\t\n189\timpl Default for RebalancerWorkerConfig {\n190\t fn default() -> Self {\n191\t Self {\n192\t max_concurrent_migrations: 4,\n193\t lease_ttl_secs: LEASE_TTL_SECS,\n194\t lease_renewal_interval_ms: LEASE_RENEWAL_INTERVAL_MS,\n195\t migration_batch_size: 1000,\n196\t migration_batch_delay_ms: 100,\n197\t event_channel_capacity: 100,\n198\t }\n199\t }\n200\t}\n201\t\n202\t/// The rebalancer background worker.\n203\t///\n204\t/// Runs as a Tokio task, acquires a leader lease, and processes topology\n205\t/// change events to drive shard migrations.\n206\tpub struct RebalancerWorker {\n207\t config: RebalancerWorkerConfig,\n208\t topology: Arc>,\n209\t task_store: Arc,\n210\t _rebalancer: Arc, // Reserved for future use\n211\t migration_coordinator: Arc>,\n212\t migration_executor: Option>,\n213\t metrics: Arc>,\n214\t pod_id: String,\n215\t /// Sender for topology change events.\n216\t event_tx: mpsc::Sender,\n217\t /// Active rebalance jobs (per index).\n218\t jobs: Arc>>,\n219\t /// Receiver for topology change events (cloned for internal use).\n220\t event_rx: Arc>>>,\n221\t /// Callback for recording Prometheus metrics.\n222\t metrics_callback: Option,\n223\t}\n224\t\n225\timpl RebalancerWorker {\n226\t /// Create a new rebalancer worker.\n227\t pub fn new(\n228\t config: RebalancerWorkerConfig,\n229\t topology: Arc>,\n230\t task_store: Arc,\n231\t rebalancer: Arc, // Reserved for future use\n232\t migration_coordinator: Arc>,\n233\t metrics: Arc>,\n234\t pod_id: String,\n235\t ) -> Self {\n236\t Self::with_metrics(config, topology, task_store, rebalancer, migration_coordinator, metrics, pod_id, None)\n237\t }\n238\t\n239\t /// Create a new rebalancer worker with metrics callback.\n240\t pub fn with_metrics(\n241\t config: RebalancerWorkerConfig,\n242\t topology: Arc>,\n243\t task_store: Arc,\n244\t rebalancer: Arc, // Reserved for future use\n245\t migration_coordinator: Arc>,\n246\t metrics: Arc>,\n247\t pod_id: String,\n248\t metrics_callback: Option,\n249\t ) -> Self {\n250\t let (event_tx, event_rx) = mpsc::channel(config.event_channel_capacity);\n251\t\n252\t Self {\n253\t config,\n254\t topology,\n255\t task_store,\n256\t _rebalancer: rebalancer, // Stored but not currently used\n257\t migration_coordinator,\n258\t migration_executor: None, // Set via with_migration_executor\n259\t metrics,\n260\t pod_id,\n261\t event_tx,\n262\t jobs: Arc::new(RwLock::new(HashMap::new())),\n263\t event_rx: Arc::new(RwLock::new(Some(event_rx))),\n264\t metrics_callback,\n265\t }\n266\t }\n267\t\n268\t /// Set the migration executor (provides HTTP client for actual migrations).\n269\t pub fn with_migration_executor(mut self, executor: Arc) -> Self {\n270\t self.migration_executor = Some(executor);\n271\t self\n272\t }\n273\t\n274\t /// Get a sender for topology change events.\n275\t pub fn event_sender(&self) -> mpsc::Sender {\n276\t self.event_tx.clone()\n277\t }\n278\t\n279\t /// Start the background worker.\n280\t ///\n281\t /// This runs in a loop:\n282\t /// 1. Try to acquire leader lease for each index (scope: rebalance:)\n283\t /// 2. If acquired, process events and run migrations\n284\t /// 3. Renew lease periodically\n285\t /// 4. If lease lost, go back to step 1\n286\t pub async fn run(&self) {\n287\t info!(\n288\t pod_id = %self.pod_id,\n289\t \"rebalancer worker starting\"\n290\t );\n291\t\n292\t loop {\n293\t // Try to acquire leader lease for each index we're managing\n294\t let mut leader_scopes = Vec::new();\n295\t\n296\t // Get all active indexes from current jobs and use default scope\n297\t let jobs = self.jobs.read().await;\n298\t let mut index_uids: Vec = jobs.values()\n299\t .map(|j| j.index_uid.clone())\n300\t .collect();\n301\t\n302\t // Always include \"default\" scope for rebalancer operations\n303\t index_uids.push(\"default\".to_string());\n304\t drop(jobs);\n305\t\n306\t // Build scopes for each index: rebalance:\n307\t let scopes: Vec = index_uids\n308\t .into_iter()\n309\t .map(|uid| format!(\"rebalance:{}\", uid))\n310\t .collect();\n311\t\n312\t let mut acquired_any = false;\n313\t for scope in &scopes {\n314\t let now_ms = now_ms();\n315\t let expires_at = now_ms + (self.config.lease_ttl_secs * 1000) as i64;\n316\t\n317\t match tokio::task::spawn_blocking({\n318\t let task_store = self.task_store.clone();\n319\t let scope = scope.clone();\n320\t let pod_id = self.pod_id.clone();\n321\t move || {\n322\t task_store.try_acquire_leader_lease(&scope, &pod_id, expires_at, now_ms)\n323\t }\n324\t })\n325\t .await\n326\t {\n327\t Ok(Ok(true)) => {\n328\t info!(scope = %scope, pod_id = %self.pod_id, \"acquired leader lease\");\n329\t leader_scopes.push(scope.clone());\n330\t acquired_any = true;\n331\t }\n332\t Ok(Ok(false)) => {\n333\t debug!(scope = %scope, \"leader lease already held\");\n334\t }\n335\t Ok(Err(e)) => {\n336\t error!(scope = %scope, error = %e, \"failed to acquire leader lease\");\n337\t }\n338\t Err(e) => {\n339\t error!(scope = %scope, error = %e, \"spawn_blocking task failed\");\n340\t }\n341\t }\n342\t }\n343\t\n344\t if acquired_any {\n345\t // We are the leader - update rebalancer metrics\n346\t {\n347\t let mut metrics = self.metrics.write().await;\n348\t metrics.start_rebalance();\n349\t }\n350\t\n351\t // Call metrics callback for rebalance start\n352\t if let Some(ref callback) = self.metrics_callback {\n353\t callback(true, None, None);\n354\t }\n355\t\n356\t // We are the leader - run the main loop\n357\t if let Err(e) = self.run_leader_loop(&leader_scopes).await {\n358\t error!(error = %e, \"leader loop failed\");\n359\t }\n360\t\n361\t // Clear rebalancer in-progress status on exit\n362\t {\n363\t let mut metrics = self.metrics.write().await;\n364\t metrics.end_rebalance();\n365\t }\n366\t\n367\t // Call metrics callback for rebalance end\n368\t if let Some(ref callback) = self.metrics_callback {\n369\t callback(false, None, None);\n370\t }\n371\t } else {\n372\t // Not the leader - wait before retrying\n373\t tokio::time::sleep(Duration::from_millis(\n374\t self.config.lease_renewal_interval_ms,\n375\t ))\n376\t .await;\n377\t }\n378\t }\n379\t }\n380\t\n381\t /// Run the leader loop: process events, renew lease, drive migrations.\n382\t async fn run_leader_loop(&self, scopes: &[String]) -> Result<(), String> {\n383\t let mut lease_renewal = tokio::time::interval(Duration::from_millis(\n384\t self.config.lease_renewal_interval_ms,\n385\t ));\n386\t\n387\t // Take the receiver out of the Option\n388\t let mut event_rx = {\n389\t let mut rx_guard = self.event_rx.write().await;\n390\t rx_guard.take().ok_or_else(|| \"event receiver already taken\".to_string())?\n391\t };\n392\t\n393\t let result = async {\n394\t loop {\n395\t tokio::select! {\n396\t // Renew lease periodically\n397\t _ = lease_renewal.tick() => {\n398\t for scope in scopes {\n399\t let now_ms = now_ms();\n400\t let expires_at = now_ms + (self.config.lease_ttl_secs * 1000) as i64;\n401\t\n402\t match tokio::task::spawn_blocking({\n403\t let task_store = self.task_store.clone();\n404\t let scope = scope.clone();\n405\t let pod_id = self.pod_id.clone();\n406\t move || {\n407\t task_store.renew_leader_lease(&scope, &pod_id, expires_at)\n408\t }\n409\t })\n410\t .await\n411\t {\n412\t Ok(Ok(true)) => {\n413\t debug!(scope = %scope, \"renewed leader lease\");\n414\t }\n415\t Ok(Ok(false)) => {\n416\t info!(scope = %scope, \"lost leader lease\");\n417\t return Ok::<(), String>(()); // Exit loop, will retry acquisition\n418\t }\n419\t Ok(Err(e)) => {\n420\t error!(scope = %scope, error = %e, \"failed to renew lease\");\n421\t return Err(format!(\"lease renewal failed: {}\", e));\n422\t }\n423\t Err(e) => {\n424\t error!(scope = %scope, error = %e, \"spawn_blocking task failed\");\n425\t return Err(format!(\"lease renewal task failed: {}\", e));\n426\t }\n427\t }\n428\t }\n429\t }\n430\t\n431\t // Process topology change events\n432\t Some(event) = event_rx.recv() => {\n433\t if let Err(e) = self.handle_topology_event(event).await {\n434\t error!(error = %e, \"failed to handle topology event\");\n435\t }\n436\t }\n437\t\n438\t // Drive active migrations\n439\t _ = tokio::time::sleep(Duration::from_millis(100)) => {\n440\t if let Err(e) = self.drive_migrations().await {\n441\t error!(error = %e, \"failed to drive migrations\");\n442\t }\n443\t }\n444\t }\n445\t }\n446\t }.await;\n447\t\n448\t // Put the receiver back for retry logic\n449\t {\n450\t let mut rx_guard = self.event_rx.write().await;\n451\t if rx_guard.is_none() {\n452\t *rx_guard = Some(event_rx);\n453\t }\n454\t }\n455\t\n456\t result\n457\t }\n458\t\n459\t /// Handle a topology change event.\n460\t async fn handle_topology_event(&self, event: TopologyChangeEvent) -> Result<(), String> {\n461\t info!(event = ?event, \"handling topology change event\");\n462\t\n463\t match event {\n464\t TopologyChangeEvent::NodeAdded {\n465\t node_id,\n466\t replica_group,\n467\t index_uid,\n468\t } => {\n469\t self.on_node_added(&node_id, replica_group, &index_uid)\n470\t .await?\n471\t }\n472\t TopologyChangeEvent::NodeDraining {\n473\t node_id,\n474\t replica_group,\n475\t index_uid,\n476\t } => {\n477\t self.on_node_draining(&node_id, replica_group, &index_uid)\n478\t .await?\n479\t }\n480\t TopologyChangeEvent::NodeFailed {\n481\t node_id,\n482\t replica_group,\n483\t index_uid,\n484\t } => {\n485\t self.on_node_failed(&node_id, replica_group, &index_uid)\n486\t .await?\n487\t }\n488\t TopologyChangeEvent::NodeRecovered {\n489\t node_id,\n490\t replica_group,\n491\t index_uid,\n492\t } => {\n493\t self.on_node_recovered(&node_id, replica_group, &index_uid)\n494\t .await?\n495\t }\n496\t }\n497\t\n498\t Ok(())\n499\t }\n500\t\n501\t /// Handle node addition: compute affected shards and create job to track migration.\n502\t async fn on_node_added(\n503\t &self,\n504\t node_id: &str,\n505\t replica_group: u32,\n506\t index_uid: &str,\n507\t ) -> Result<(), String> {\n508\t let job_id = RebalanceJobId::new(index_uid);\n509\t\n510\t // Check if we already have a job for this index\n511\t {\n512\t let jobs = self.jobs.read().await;\n513\t if jobs.contains_key(&job_id) {\n514\t debug!(index_uid = %index_uid, \"rebalance job already exists\");\n515\t return Ok(());\n516\t }\n517\t }\n518\t\n519\t // Compute affected shards using the Phase 1 router\n520\t let affected_shards = self.compute_affected_shards_for_add(node_id, replica_group).await?;\n521\t\n522\t if affected_shards.is_empty() {\n523\t info!(\n524\t node_id = %node_id,\n525\t replica_group = replica_group,\n526\t \"no shards need migration for node addition\"\n527\t );\n528\t return Ok(());\n529\t }\n530\t\n531\t info!(\n532\t node_id = %node_id,\n533\t replica_group = replica_group,\n534\t shard_count = affected_shards.len(),\n535\t \"computed affected shards for node addition\"\n536\t );\n537\t\n538\t // Build migration state: shard -> old owner mapping\n539\t let mut old_owners = HashMap::new();\n540\t let mut shard_states = HashMap::new();\n541\t for (shard_id, source_node) in &affected_shards {\n542\t old_owners.insert(ShardId(*shard_id), topo_to_migration_node_id(source_node));\n543\t shard_states.insert(\n544\t *shard_id,\n545\t ShardState {\n546\t phase: ShardMigrationPhase::Idle,\n547\t docs_migrated: 0,\n548\t last_offset: 0,\n549\t source_node: Some(source_node.to_string()),\n550\t target_node: node_id.to_string(),\n551\t started_at: Instant::now(),\n552\t },\n553\t );\n554\t }\n555\t\n556\t // Create migration in coordinator for state tracking and dual-write\n557\t let migration_id = {\n558\t let mut coordinator = self.migration_coordinator.write().await;\n559\t let new_node = topo_to_migration_node_id(&TopologyNodeId::new(node_id.to_string()));\n560\t coordinator.begin_migration(new_node, replica_group, old_owners)\n561\t .map_err(|e| format!(\"failed to create migration: {}\", e))?\n562\t };\n563\t\n564\t // Start dual-write immediately so the router starts writing to both nodes\n565\t {\n566\t let mut coordinator = self.migration_coordinator.write().await;\n567\t coordinator.begin_dual_write(migration_id)\n568\t .map_err(|e| format!(\"failed to start dual-write: {}\", e))?;\n569\t }\n570\t\n571\t let job = RebalanceJob {\n572\t id: job_id.clone(),\n573\t index_uid: index_uid.to_string(),\n574\t replica_group,\n575\t shards: shard_states,\n576\t started_at: Instant::now(),\n577\t completed_at: None,\n578\t total_docs_migrated: 0,\n579\t paused: false,\n580\t };\n581\t\n582\t // Persist job to task store\n583\t self.persist_job(&job).await?;\n584\t\n585\t // Store in memory\n586\t let mut jobs = self.jobs.write().await;\n587\t jobs.insert(job_id.clone(), job);\n588\t\n589\t info!(\n590\t migration_id = %migration_id,\n591\t shard_count = affected_shards.len(),\n592\t \"created migration for node addition\"\n593\t );\n594\t\n595\t Ok(())\n596\t }\n597\t\n598\t /// Handle node draining: compute destination shards and create job to track migration.\n599\t async fn on_node_draining(\n600\t &self,\n601\t node_id: &str,\n602\t replica_group: u32,\n603\t index_uid: &str,\n604\t ) -> Result<(), String> {\n605\t let job_id = RebalanceJobId::new(index_uid);\n606\t\n607\t // Compute shard destinations\n608\t let shard_destinations = self\n609\t .compute_shard_destinations_for_drain(node_id, replica_group)\n610\t .await?;\n611\t\n612\t if shard_destinations.is_empty() {\n613\t info!(\n614\t node_id = %node_id,\n615\t replica_group = replica_group,\n616\t \"no shards need migration for node drain\"\n617\t );\n618\t return Ok(());\n619\t }\n620\t\n621\t info!(\n622\t node_id = %node_id,\n623\t replica_group = replica_group,\n624\t shard_count = shard_destinations.len(),\n625\t \"computed shard destinations for node drain\"\n626\t );\n627\t\n628\t // Build migration state: shard -> old owner (draining node) mapping\n629\t let mut old_owners = HashMap::new();\n630\t let mut shard_states = HashMap::new();\n631\t for (shard_id, dest_node) in &shard_destinations {\n632\t old_owners.insert(ShardId(*shard_id), topo_to_migration_node_id(&TopologyNodeId::new(node_id.to_string())));\n633\t shard_states.insert(\n634\t *shard_id,\n635\t ShardState {\n636\t phase: ShardMigrationPhase::Idle,\n637\t docs_migrated: 0,\n638\t last_offset: 0,\n639\t source_node: Some(node_id.to_string()),\n640\t target_node: dest_node.to_string(),\n641\t started_at: Instant::now(),\n642\t },\n643\t );\n644\t }\n645\t\n646\t // Create migration in coordinator for state tracking and dual-write\n647\t let migration_id = {\n648\t let mut coordinator = self.migration_coordinator.write().await;\n649\t // For drain, the destination node becomes the \"new\" node in the migration\n650\t if let Some((_, first_dest)) = shard_destinations.first() {\n651\t let new_node = topo_to_migration_node_id(first_dest);\n652\t coordinator.begin_migration(new_node, replica_group, old_owners)\n653\t .map_err(|e| format!(\"failed to create migration: {}\", e))?\n654\t } else {\n655\t return Err(\"no shards to migrate\".to_string());\n656\t }\n657\t };\n658\t\n659\t // Start dual-write immediately\n660\t {\n661\t let mut coordinator = self.migration_coordinator.write().await;\n662\t coordinator.begin_dual_write(migration_id)\n663\t .map_err(|e| format!(\"failed to start dual-write: {}\", e))?;\n664\t }\n665\t\n666\t let job = RebalanceJob {\n667\t id: job_id.clone(),\n668\t index_uid: index_uid.to_string(),\n669\t replica_group,\n670\t shards: shard_states,\n671\t started_at: Instant::now(),\n672\t completed_at: None,\n673\t total_docs_migrated: 0,\n674\t paused: false,\n675\t };\n676\t\n677\t // Persist job to task store\n678\t self.persist_job(&job).await?;\n679\t\n680\t // Store in memory\n681\t let mut jobs = self.jobs.write().await;\n682\t jobs.insert(job_id.clone(), job);\n683\t\n684\t info!(\n685\t migration_id = %migration_id,\n686\t shard_count = shard_destinations.len(),\n687\t \"created migration for node drain\"\n688\t );\n689\t\n690\t Ok(())\n691\t }\n692\t\n693\t /// Handle node failure.\n694\t async fn on_node_failed(\n695\t &self,\n696\t node_id: &str,\n697\t replica_group: u32,\n698\t index_uid: &str,\n699\t ) -> Result<(), String> {\n700\t info!(\n701\t node_id = %node_id,\n702\t replica_group = replica_group,\n703\t index_uid = %index_uid,\n704\t \"handling node failure\"\n705\t );\n706\t\n707\t // Mark node as failed in topology\n708\t let node_id_obj = TopologyNodeId::new(node_id.to_string());\n709\t {\n710\t let mut topo = self.topology.write().await;\n711\t if let Some(node) = topo.node_mut(&node_id_obj) {\n712\t node.status = crate::topology::NodeStatus::Failed;\n713\t }\n714\t }\n715\t\n716\t // TODO: Schedule replication to restore RF if needed\n717\t // For now, just log the failure\n718\t Ok(())\n719\t }\n720\t\n721\t /// Handle node recovery.\n722\t async fn on_node_recovered(\n723\t &self,\n724\t node_id: &str,\n725\t replica_group: u32,\n726\t index_uid: &str,\n727\t ) -> Result<(), String> {\n728\t info!(\n729\t node_id = %node_id,\n730\t replica_group = replica_group,\n731\t index_uid = %index_uid,\n732\t \"handling node recovery\"\n733\t );\n734\t\n735\t // Mark node as active in topology\n736\t let node_id_obj = TopologyNodeId::new(node_id.to_string());\n737\t {\n738\t let mut topo = self.topology.write().await;\n739\t if let Some(node) = topo.node_mut(&node_id_obj) {\n740\t node.status = crate::topology::NodeStatus::Active;\n741\t }\n742\t }\n743\t\n744\t // TODO: If auto_rebalance_on_recovery is enabled, trigger rebalancing\n745\t\n746\t Ok(())\n747\t }\n748\t\n749\t /// Compute which shards are affected by adding a new node.\n750\t /// Returns shard -> source_node mapping for shards that will move.\n751\t async fn compute_affected_shards_for_add(\n752\t &self,\n753\t new_node_id: &str,\n754\t replica_group: u32,\n755\t ) -> Result, String> {\n756\t let topo = self.topology.read().await;\n757\t let new_node_id = TopologyNodeId::new(new_node_id.to_string());\n758\t let rf = topo.rf();\n759\t\n760\t // Find the target group\n761\t let group = topo\n762\t .groups()\n763\t .find(|g| g.id == replica_group)\n764\t .ok_or_else(|| format!(\"replica group {} not found\", replica_group))?;\n765\t\n766\t let existing_nodes: Vec<_> = group.nodes().iter().cloned().collect();\n767\t let mut affected_shards = Vec::new();\n768\t\n769\t // For each shard, check if adding the new node would change the assignment\n770\t for shard_id in 0..topo.shards {\n771\t let old_assignment: Vec<_> =\n772\t assign_shard_in_group(shard_id, &existing_nodes, rf);\n773\t\n774\t // New assignment with the new node included\n775\t let all_nodes: Vec<_> = existing_nodes\n776\t .iter()\n777\t .cloned()\n778\t .chain(std::iter::once(new_node_id.clone()))\n779\t .collect();\n780\t let new_assignment: Vec<_> = assign_shard_in_group(shard_id, &all_nodes, rf);\n781\t\n782\t // Check if the new node is in the new assignment\n783\t if new_assignment.contains(&new_node_id) {\n784\t // This shard moves to the new node\n785\t if let Some(old_owner) = old_assignment.first() {\n786\t affected_shards.push((shard_id, old_owner.clone()));\n787\t }\n788\t }\n789\t }\n790\t\n791\t Ok(affected_shards)\n792\t }\n793\t\n794\t /// Compute where each shard should go when draining a node.\n795\t /// Returns shard -> destination_node mapping.\n796\t async fn compute_shard_destinations_for_drain(\n797\t &self,\n798\t drain_node_id: &str,\n799\t replica_group: u32,\n800\t ) -> Result, String> {\n801\t let topo = self.topology.read().await;\n802\t let drain_node_id = TopologyNodeId::new(drain_node_id.to_string());\n803\t let rf = topo.rf();\n804\t\n805\t // Find the target group\n806\t let group = topo\n807\t .groups()\n808\t .find(|g| g.id == replica_group)\n809\t .ok_or_else(|| format!(\"replica group {} not found\", replica_group))?;\n810\t\n811\t let other_nodes: Vec<_> = group\n812\t .nodes()\n813\t .iter()\n814\t .filter(|n| **n != drain_node_id)\n815\t .cloned()\n816\t .collect();\n817\t\n818\t if other_nodes.is_empty() {\n819\t return Err(\"cannot remove last node in group\".to_string());\n820\t }\n821\t\n822\t let mut destinations = Vec::new();\n823\t\n824\t // For each shard, find a new owner among the remaining nodes\n825\t for shard_id in 0..topo.shards {\n826\t let assignment: Vec<_> = assign_shard_in_group(shard_id, group.nodes(), rf);\n827\t\n828\t if assignment.contains(&drain_node_id) {\n829\t // This shard needs a new home\n830\t let mut best_node = None;\n831\t let mut best_score = 0u64;\n832\t\n833\t for node in &other_nodes {\n834\t let s = crate::router::score(shard_id, node.as_str());\n835\t if s > best_score {\n836\t best_score = s;\n837\t best_node = Some(node.clone());\n838\t }\n839\t }\n840\t\n841\t if let Some(dest) = best_node {\n842\t destinations.push((shard_id, dest));\n843\t }\n844\t }\n845\t }\n846\t\n847\t Ok(destinations)\n848\t }\n849\t\n850\t /// Drive active migrations forward.\n851\t async fn drive_migrations(&self) -> Result<(), String> {\n852\t let jobs = self.jobs.read().await;\n853\t let mut active_jobs = Vec::new();\n854\t\n855\t for (job_id, job) in jobs.iter() {\n856\t if job.paused || job.completed_at.is_some() {\n857\t continue;\n858\t }\n859\t\n860\t // Count how many shards are actively migrating\n861\t let migrating_count = job\n862\t .shards\n863\t .values()\n864\t .filter(|s| {\n865\t matches!(\n866\t s.phase,\n867\t ShardMigrationPhase::MigrationInProgress\n868\t | ShardMigrationPhase::DualWriteStarted\n869\t )\n870\t })\n871\t .count();\n872\t\n873\t if migrating_count < self.config.max_concurrent_migrations as usize {\n874\t active_jobs.push((job_id.clone(), job.clone()));\n875\t }\n876\t }\n877\t\n878\t // Drop read lock before processing\n879\t drop(jobs);\n880\t\n881\t // Process up to max_concurrent_migrations jobs\n882\t for (job_id, job) in active_jobs\n883\t .into_iter()\n884\t .take(self.config.max_concurrent_migrations as usize)\n885\t {\n886\t if let Err(e) = self.process_job(&job_id).await {\n887\t error!(job_id = %job_id.0, error = %e, \"failed to process job\");\n888\t }\n889\t }\n890\t\n891\t Ok(())\n892\t }\n893\t\n894\t /// Emit Prometheus metrics for the current rebalancer state.\n895\t pub async fn emit_metrics(&self) {\n896\t let jobs = self.jobs.read().await;\n897\t\n898\t // Calculate total documents migrated across all jobs\n899\t let total_docs: u64 = jobs.values()\n900\t .map(|j| j.total_docs_migrated)\n901\t .sum();\n902\t\n903\t // Check if any rebalance is in progress\n904\t let in_progress = jobs.values().any(|j| j.completed_at.is_none() && !j.paused);\n905\t\n906\t drop(jobs);\n907\t\n908\t // Update internal metrics\n909\t {\n910\t let mut metrics = self.metrics.write().await;\n911\t if in_progress {\n912\t metrics.start_rebalance();\n913\t } else {\n914\t metrics.end_rebalance();\n915\t }\n916\t // Note: documents_migrated_total is already tracked in RebalancerMetrics\n917\t // and synced to Prometheus via the health checker\n918\t let _ = total_docs;\n919\t }\n920\t\n921\t // Call metrics callback for rebalance status\n922\t if let Some(ref callback) = self.metrics_callback {\n923\t callback(in_progress, None, None);\n924\t }\n925\t }\n926\t\n927\t /// Get the current rebalancer status for monitoring.\n928\t pub async fn get_status(&self) -> RebalancerWorkerStatus {\n929\t let jobs = self.jobs.read().await;\n930\t\n931\t let active_jobs = jobs.values()\n932\t .filter(|j| j.completed_at.is_none() && !j.paused)\n933\t .count();\n934\t\n935\t let completed_jobs = jobs.values()\n936\t .filter(|j| j.completed_at.is_some())\n937\t .count();\n938\t\n939\t let paused_jobs = jobs.values()\n940\t .filter(|j| j.paused)\n941\t .count();\n942\t\n943\t let total_shards: usize = jobs.values()\n944\t .map(|j| j.shards.len())\n945\t .sum();\n946\t\n947\t let completed_shards: usize = jobs.values()\n948\t .map(|j| j.shards.values().filter(|s| s.phase == ShardMigrationPhase::OldReplicaDeleted).count())\n949\t .sum();\n950\t\n951\t RebalancerWorkerStatus {\n952\t active_jobs,\n953\t completed_jobs,\n954\t paused_jobs,\n955\t total_shards,\n956\t completed_shards,\n957\t }\n958\t }\n959\t\n960\t /// Process a single rebalance job.\n961\t ///\n962\t /// Drives the migration state machine forward for each shard in the job.\n963\t /// This is the core method that advances migrations through their phases.\n964\t async fn process_job(&self, job_id: &RebalanceJobId) -> Result<(), String> {\n965\t // Get job (cloned to avoid holding lock)\n966\t let job = {\n967\t let jobs = self.jobs.read().await;\n968\t jobs.get(job_id).cloned()\n969\t };\n970\t\n971\t let mut job = match job {\n972\t Some(j) => j,\n973\t None => return Ok(()), // Job may have been removed\n974\t };\n975\t\n976\t // Skip paused or completed jobs\n977\t if job.paused || job.completed_at.is_some() {\n978\t return Ok(());\n979\t }\n980\t\n981\t // Sync worker job state with MigrationCoordinator state\n982\t // This ensures we resume from the correct phase after a pod restart\n983\t self.sync_job_with_coordinator(&mut job).await?;\n984\t\n985\t // Get the migration from the coordinator for this job\n986\t let migration_id = {\n987\t let coordinator = self.migration_coordinator.read().await;\n988\t let mut found_id = None;\n989\t for (mid, state) in coordinator.get_all_migrations() {\n990\t // Match by index_uid and replica_group\n991\t if state.replica_group == job.replica_group {\n992\t found_id = Some(*mid);\n993\t break;\n994\t }\n995\t }\n996\t found_id.ok_or_else(|| \"no migration found for this job\".to_string())?\n997\t };\n998\t\n999\t // Get migration state to access node addresses\n1000\t let (new_node, old_owners) = {\n1001\t let coordinator = self.migration_coordinator.read().await;\n1002\t let state = coordinator.get_state(migration_id)\n1003\t .ok_or_else(|| \"migration state not found\".to_string())?;\n1004\t (state.new_node.clone(), state.old_owners.clone())\n1005\t };\n1006\t\n1007\t // Get node addresses from topology\n1008\t let (new_node_address, old_owner_addresses) = {\n1009\t let topo = self.topology.read().await;\n1010\t let new_addr = topo.node(&migration_to_topo_node_id(&new_node))\n1011\t .ok_or_else(|| format!(\"new node not found: {}\", new_node.0))?\n1012\t .address.clone();\n1013\t\n1014\t let mut old_addrs = HashMap::new();\n1015\t for (shard, old_node) in &old_owners {\n1016\t if let Some(node) = topo.node(&migration_to_topo_node_id(old_node)) {\n1017\t old_addrs.insert(*shard, node.address.clone());\n1018\t }\n1019\t }\n1020\t\n1021\t (new_addr, old_addrs)\n1022\t };\n1023\t\n1024\t // Use a default index for now - in production, this would come from config\n1025\t let index_uid = \"default\".to_string();\n1026\t\n1027\t // Drive migrations forward for each shard\n1028\t let mut updated = false;\n1029\t let mut total_docs_migrated = 0u64;\n1030\t\n1031\t // Limit concurrent migrations to stay within memory budget\n1032\t let mut active_count = 0;\n1033\t\n1034\t for (&shard_id, shard_state) in job.shards.iter_mut() {\n1035\t // Check concurrent migration limit\n1036\t if active_count >= self.config.max_concurrent_migrations as usize {\n1037\t break;\n1038\t }\n1039\t\n1040\t match shard_state.phase {\n1041\t ShardMigrationPhase::Idle => {\n1042\t // Already started dual-write in on_node_added/on_node_draining\n1043\t shard_state.phase = ShardMigrationPhase::DualWriteStarted;\n1044\t updated = true;\n1045\t }\n1046\t ShardMigrationPhase::DualWriteStarted => {\n1047\t // Start background migration\n1048\t if let Some(ref executor) = self.migration_executor {\n1049\t if let Some(old_address) = old_owner_addresses.get(&ShardId(shard_id)) {\n1050\t let old_node = old_owners.get(&ShardId(shard_id))\n1051\t .cloned()\n1052\t .unwrap_or_else(|| crate::migration::NodeId(\"unknown\".to_string()));\n1053\t if let Err(e) = self.execute_background_migration(\n1054\t executor,\n1055\t migration_id,\n1056\t shard_id,\n1057\t &old_node,\n1058\t old_address,\n1059\t &new_node.0,\n1060\t &new_node_address,\n1061\t &index_uid,\n1062\t ).await {\n1063\t error!(shard_id, error = %e, \"failed to execute background migration\");\n1064\t shard_state.phase = ShardMigrationPhase::Failed;\n1065\t } else {\n1066\t shard_state.phase = ShardMigrationPhase::MigrationInProgress;\n1067\t active_count += 1;\n1068\t updated = true;\n1069\t }\n1070\t }\n1071\t } else {\n1072\t // No executor - skip directly to complete for testing\n1073\t shard_state.docs_migrated = 1000; // Simulated\n1074\t shard_state.phase = ShardMigrationPhase::MigrationComplete;\n1075\t updated = true;\n1076\t }\n1077\t }\n1078\t ShardMigrationPhase::MigrationInProgress => {\n1079\t // Check if migration is complete by querying the coordinator\n1080\t let complete = self.check_migration_complete_for_shard(shard_id).await?;\n1081\t if complete {\n1082\t shard_state.phase = ShardMigrationPhase::MigrationComplete;\n1083\t active_count -= 1; // One less active migration\n1084\t updated = true;\n1085\t }\n1086\t }\n1087\t ShardMigrationPhase::MigrationComplete => {\n1088\t // Begin cutover sequence\n1089\t if let Err(e) = self.begin_cutover_for_shard(shard_id).await {\n1090\t error!(shard_id, error = %e, \"failed to begin cutover\");\n1091\t } else {\n1092\t shard_state.phase = ShardMigrationPhase::DualWriteStopped;\n1093\t updated = true;\n1094\t }\n1095\t }\n1096\t ShardMigrationPhase::DualWriteStopped => {\n1097\t // Complete cutover and delete old replica\n1098\t if let Err(e) = self.complete_cutover_for_shard(shard_id).await {\n1099\t error!(shard_id, error = %e, \"failed to complete cutover\");\n1100\t } else {\n1101\t shard_state.phase = ShardMigrationPhase::OldReplicaDeleted;\n1102\t updated = true;\n1103\t }\n1104\t }\n1105\t ShardMigrationPhase::OldReplicaDeleted => {\n1106\t // Migration complete for this shard\n1107\t }\n1108\t ShardMigrationPhase::Failed => {\n1109\t // Migration failed - skip this shard\n1110\t }\n1111\t }\n1112\t\n1113\t total_docs_migrated += shard_state.docs_migrated;\n1114\t }\n1115\t\n1116\t // Update total docs migrated for the job\n1117\t job.total_docs_migrated = total_docs_migrated;\n1118\t\n1119\t // Update metrics\n1120\t {\n1121\t let mut metrics = self.metrics.write().await;\n1122\t metrics.record_documents_migrated(total_docs_migrated);\n1123\t }\n1124\t\n1125\t // Call metrics callback for documents migrated\n1126\t if let Some(ref callback) = self.metrics_callback {\n1127\t callback(false, Some(total_docs_migrated), None);\n1128\t }\n1129\t\n1130\t // Check if job is complete (all shards in final state)\n1131\t let all_complete = job.shards.values().all(|s| {\n1132\t matches!(s.phase, ShardMigrationPhase::OldReplicaDeleted | ShardMigrationPhase::Failed)\n1133\t });\n1134\t\n1135\t if all_complete && job.completed_at.is_none() {\n1136\t job.completed_at = Some(Instant::now());\n1137\t\n1138\t // Record final duration metric\n1139\t let duration = job.started_at.elapsed().as_secs_f64();\n1140\t {\n1141\t let mut metrics = self.metrics.write().await;\n1142\t metrics.end_rebalance();\n1143\t info!(\n1144\t job_id = %job_id.0,\n1145\t duration_secs = duration,\n1146\t \"rebalance job completed\"\n1147\t );\n1148\t }\n1149\t\n1150\t // Call metrics callback for rebalance completion with duration\n1151\t if let Some(ref callback) = self.metrics_callback {\n1152\t callback(false, None, Some(duration));\n1153\t }\n1154\t\n1155\t // Update job in memory\n1156\t let mut jobs = self.jobs.write().await;\n1157\t jobs.insert(job_id.clone(), job.clone());\n1158\t\n1159\t // Persist to task store\n1160\t self.persist_job(&job).await?;\n1161\t\n1162\t // Persist progress for each shard\n1163\t for shard_id in job.shards.keys() {\n1164\t self.persist_job_progress(&job, *shard_id).await?;\n1165\t }\n1166\t }\n1167\t\n1168\t Ok(())\n1169\t }\n1170\t\n1171\t /// Persist a job to the task store.\n1172\t async fn persist_job(&self, job: &RebalanceJob) -> Result<(), String> {\n1173\t let progress = serde_json::to_string(job)\n1174\t .map_err(|e| format!(\"failed to serialize job: {}\", e))?;\n1175\t\n1176\t let new_job = NewJob {\n1177\t id: job.id.0.clone(),\n1178\t type_: \"rebalance\".to_string(),\n1179\t params: progress,\n1180\t state: if job.completed_at.is_some() {\n1181\t \"completed\".to_string()\n1182\t } else if job.paused {\n1183\t \"paused\".to_string()\n1184\t } else {\n1185\t \"running\".to_string()\n1186\t },\n1187\t progress: format!(\n1188\t \"{{\\\"total_shards\\\":{},\\\"completed\\\":{},\\\"docs_migrated\\\":{}}}\",\n1189\t job.shards.len(),\n1190\t job.shards\n1191\t .values()\n1192\t .filter(|s| s.phase == ShardMigrationPhase::OldReplicaDeleted)\n1193\t .count(),\n1194\t job.total_docs_migrated\n1195\t ),\n1196\t };\n1197\t\n1198\t tokio::task::spawn_blocking({\n1199\t let task_store = self.task_store.clone();\n1200\t let new_job = new_job.clone();\n1201\t move || {\n1202\t task_store.insert_job(&new_job)\n1203\t }\n1204\t })\n1205\t .await\n1206\t .map_err(|e| format!(\"failed to persist job: {}\", e))?\n1207\t .map_err(|e| format!(\"failed to persist job: {}\", e))?;\n1208\t\n1209\t Ok(())\n1210\t }\n1211\t\n1212\t /// Persist progress for a single shard.\n1213\t async fn persist_job_progress(\n1214\t &self,\n1215\t job: &RebalanceJob,\n1216\t shard_id: u32,\n1217\t ) -> Result<(), String> {\n1218\t if let Some(shard_state) = job.shards.get(&shard_id) {\n1219\t let progress = ShardMigrationProgress {\n1220\t shard_id,\n1221\t phase: format!(\"{:?}\", shard_state.phase),\n1222\t docs_migrated: shard_state.docs_migrated,\n1223\t last_offset: shard_state.last_offset,\n1224\t source_node: shard_state.source_node.clone(),\n1225\t target_node: shard_state.target_node.clone(),\n1226\t };\n1227\t\n1228\t let progress_json =\n1229\t serde_json::to_string(&progress)\n1230\t .map_err(|e| format!(\"failed to serialize progress: {}\", e))?;\n1231\t\n1232\t // Update job progress in task store\n1233\t tokio::task::spawn_blocking({\n1234\t let task_store = self.task_store.clone();\n1235\t let job_id = job.id.0.clone();\n1236\t let completed_at = format!(\"{:?}\", job.completed_at.is_some());\n1237\t let progress_json = progress_json.clone();\n1238\t move || {\n1239\t task_store.update_job_progress(&job_id, &completed_at, &progress_json)\n1240\t }\n1241\t })\n1242\t .await\n1243\t .map_err(|e| format!(\"failed to update job progress: {}\", e))?\n1244\t .map_err(|e| format!(\"failed to update job progress: {}\", e))?;\n1245\t }\n1246\t\n1247\t Ok(())\n1248\t }\n1249\t\n1250\t /// Sync worker job state with MigrationCoordinator state.\n1251\t ///\n1252\t /// This ensures that after a pod restart, the worker's job state reflects\n1253\t /// the actual migration state tracked by the coordinator.\n1254\t async fn sync_job_with_coordinator(&self, job: &mut RebalanceJob) -> Result<(), String> {\n1255\t let coordinator = self.migration_coordinator.read().await;\n1256\t\n1257\t // For each shard in the job, check if there's a corresponding migration\n1258\t // in the coordinator and sync the state\n1259\t for (&shard_id, shard_state) in job.shards.iter_mut() {\n1260\t let shard = ShardId(shard_id);\n1261\t\n1262\t // Look for a migration in the coordinator that affects this shard\n1263\t for (_mid, migration_state) in coordinator.get_all_migrations() {\n1264\t if let Some(migration_shard_state) = migration_state.affected_shards.get(&shard) {\n1265\t // Sync the phase based on the migration coordinator state\n1266\t use crate::migration::ShardMigrationState as CoordinatorState;\n1267\t shard_state.phase = match migration_shard_state {\n1268\t CoordinatorState::Pending => ShardMigrationPhase::Idle,\n1269\t CoordinatorState::Migrating { .. } => ShardMigrationPhase::MigrationInProgress,\n1270\t CoordinatorState::MigrationComplete { docs_copied } => {\n1271\t shard_state.docs_migrated = *docs_copied;\n1272\t ShardMigrationPhase::MigrationComplete\n1273\t }\n1274\t CoordinatorState::Draining { .. } => ShardMigrationPhase::DualWriteStopped,\n1275\t CoordinatorState::DeltaPass { docs_copied, delta_docs_copied } => {\n1276\t shard_state.docs_migrated = docs_copied + delta_docs_copied;\n1277\t ShardMigrationPhase::DualWriteStopped\n1278\t }\n1279\t CoordinatorState::Active => ShardMigrationPhase::OldReplicaDeleted,\n1280\t CoordinatorState::Failed { .. } => ShardMigrationPhase::Failed,\n1281\t };\n1282\t }\n1283\t }\n1284\t }\n1285\t\n1286\t Ok(())\n1287\t }\n1288\t\n1289\t /// Start dual-write phase for a shard.\n1290\t async fn start_dual_write_for_shard(&self, _replica_group: u32, shard_id: u32) -> Result<(), String> {\n1291\t let shard = ShardId(shard_id);\n1292\t let mut coordinator = self.migration_coordinator.write().await;\n1293\t\n1294\t // Find or create the migration for this shard\n1295\t // For now, we'll create a new migration if one doesn't exist\n1296\t // In production, this would be created when the job is created\n1297\t\n1298\t info!(\n1299\t shard_id,\n1300\t \"starting dual-write phase\"\n1301\t );\n1302\t\n1303\t // The dual-write is handled by the router checking is_dual_write_active\n1304\t // We just need to ensure the migration coordinator knows about this shard\n1305\t Ok(())\n1306\t }\n1307\t\n1308\t /// Begin cutover sequence for a shard.\n1309\t async fn begin_cutover_for_shard(&self, shard_id: u32) -> Result<(), String> {\n1310\t info!(\n1311\t shard_id,\n1312\t \"beginning cutover sequence\"\n1313\t );\n1314\t\n1315\t let shard = ShardId(shard_id);\n1316\t let mut coordinator = self.migration_coordinator.write().await;\n1317\t\n1318\t // Collect the migrations that affect this shard first\n1319\t let migrations_to_cutover: Vec<_> = coordinator.get_all_migrations()\n1320\t .iter()\n1321\t .filter(|(_, migration_state)| migration_state.affected_shards.contains_key(&shard))\n1322\t .map(|(mid, _)| *mid)\n1323\t .collect();\n1324\t\n1325\t // Now perform the cutover\n1326\t for mid in migrations_to_cutover {\n1327\t coordinator.begin_cutover(mid).map_err(|e| e.to_string())?;\n1328\t break; // Only need to cutover one migration per shard\n1329\t }\n1330\t\n1331\t Ok(())\n1332\t }\n1333\t\n1334\t /// Complete cutover and delete old replica for a shard.\n1335\t async fn complete_cutover_for_shard(&self, shard_id: u32) -> Result<(), String> {\n1336\t info!(\n1337\t shard_id,\n1338\t \"completing cutover and deleting old replica\"\n1339\t );\n1340\t\n1341\t let shard = ShardId(shard_id);\n1342\t let mut coordinator = self.migration_coordinator.write().await;\n1343\t\n1344\t // Collect the migrations that affect this shard first\n1345\t let migrations_to_complete: Vec<_> = coordinator.get_all_migrations()\n1346\t .iter()\n1347\t .filter(|(_, migration_state)| migration_state.affected_shards.contains_key(&shard))\n1348\t .map(|(mid, _)| *mid)\n1349\t .collect();\n1350\t\n1351\t // Now complete the cleanup\n1352\t for mid in migrations_to_complete {\n1353\t coordinator.complete_drain(mid).map_err(|e| e.to_string())?;\n1354\t coordinator.complete_cleanup(mid).map_err(|e| e.to_string())?;\n1355\t break; // Only need to complete one migration per shard\n1356\t }\n1357\t\n1358\t Ok(())\n1359\t }\n1360\t\n1361\t /// Start background migration for a shard.\n1362\t async fn start_background_migration_for_shard(&self, shard_id: u32) -> Result<(), String> {\n1363\t info!(\n1364\t shard_id,\n1365\t \"starting background migration\"\n1366\t );\n1367\t\n1368\t // The actual migration is handled by the Rebalancer component's migration executor\n1369\t // This method just signals that we're ready for background migration to proceed\n1370\t Ok(())\n1371\t }\n1372\t\n1373\t /// Check if migration is complete for a shard.\n1374\t async fn check_migration_complete_for_shard(&self, shard_id: u32) -> Result {\n1375\t let shard = ShardId(shard_id);\n1376\t let coordinator = self.migration_coordinator.read().await;\n1377\t\n1378\t // Check if the migration coordinator has marked this shard as complete\n1379\t for (_mid, migration_state) in coordinator.get_all_migrations() {\n1380\t if let Some(shard_state) = migration_state.affected_shards.get(&shard) {\n1381\t use crate::migration::ShardMigrationState as CoordinatorState;\n1382\t if matches!(shard_state, CoordinatorState::MigrationComplete { .. }) {\n1383\t return Ok(true);\n1384\t }\n1385\t }\n1386\t }\n1387\t\n1388\t Ok(false)\n1389\t }\n1390\t\n1391\t /// Execute background migration for a shard.\n1392\t ///\n1393\t /// This performs the actual document migration from source to target node\n1394\t /// using pagination to stay within memory bounds.\n1395\t async fn execute_background_migration(\n1396\t &self,\n1397\t executor: &Arc,\n1398\t migration_id: MigrationId,\n1399\t shard_id: u32,\n1400\t old_node_id: &MigrationNodeId,\n1401\t old_address: &str,\n1402\t new_node_id: &str,\n1403\t new_address: &str,\n1404\t index_uid: &str,\n1405\t ) -> Result<(), String> {\n1406\t info!(\n1407\t migration_id = %migration_id,\n1408\t shard_id,\n1409\t from = %old_node_id.0,\n1410\t to = %new_node_id,\n1411\t \"starting shard migration\"\n1412\t );\n1413\t\n1414\t // Paginate through all documents for this shard\n1415\t let mut offset = 0u32;\n1416\t let limit = self.config.migration_batch_size;\n1417\t let mut total_docs_copied = 0u64;\n1418\t\n1419\t loop {\n1420\t // Fetch documents from source\n1421\t let (docs, _total) = executor.fetch_documents(\n1422\t &old_node_id.0,\n1423\t old_address,\n1424\t index_uid,\n1425\t shard_id,\n1426\t limit,\n1427\t offset,\n1428\t ).await.map_err(|e| format!(\"fetch failed: {}\", e))?;\n1429\t\n1430\t if docs.is_empty() {\n1431\t break; // No more documents\n1432\t }\n1433\t\n1434\t // Write documents to target\n1435\t executor.write_documents(\n1436\t new_node_id,\n1437\t new_address,\n1438\t index_uid,\n1439\t docs.clone(),\n1440\t ).await.map_err(|e| format!(\"write failed: {}\", e))?;\n1441\t\n1442\t total_docs_copied += docs.len() as u64;\n1443\t offset += limit;\n1444\t\n1445\t // Throttle if configured\n1446\t if self.config.migration_batch_delay_ms > 0 {\n1447\t tokio::time::sleep(Duration::from_millis(\n1448\t self.config.migration_batch_delay_ms,\n1449\t ))\n1450\t .await;\n1451\t }\n1452\t }\n1453\t\n1454\t // Mark shard migration complete in coordinator\n1455\t {\n1456\t let mut coordinator = self.migration_coordinator.write().await;\n1457\t coordinator.shard_migration_complete(migration_id, ShardId(shard_id), total_docs_copied)\n1458\t .map_err(|e| format!(\"failed to mark shard complete: {}\", e))?;\n1459\t }\n1460\t\n1461\t // Update metrics\n1462\t {\n1463\t let mut metrics = self.metrics.write().await;\n1464\t metrics.record_documents_migrated(total_docs_copied);\n1465\t }\n1466\t\n1467\t // Call metrics callback for documents migrated\n1468\t if let Some(ref callback) = self.metrics_callback {\n1469\t callback(false, Some(total_docs_copied), None);\n1470\t }\n1471\t\n1472\t info!(\n1473\t migration_id = %migration_id,\n1474\t shard_id,\n1475\t docs_copied = total_docs_copied,\n1476\t \"shard migration complete\"\n1477\t );\n1478\t\n1479\t Ok(())\n1480\t }\n1481\t\n1482\t /// Pause an in-progress rebalance.\n1483\t\n1484\t /// Pause an in-progress rebalance.\n1485\t pub async fn pause_rebalance(&self, index_uid: &str) -> Result<(), String> {\n1486\t let job_id = RebalanceJobId::new(index_uid);\n1487\t let mut jobs = self.jobs.write().await;\n1488\t\n1489\t if let Some(job) = jobs.get_mut(&job_id) {\n1490\t job.paused = true;\n1491\t info!(index_uid = %index_uid, \"paused rebalance\");\n1492\t Ok(())\n1493\t } else {\n1494\t Err(format!(\"no rebalance job found for index {}\", index_uid))\n1495\t }\n1496\t }\n1497\t\n1498\t /// Resume a paused rebalance.\n1499\t pub async fn resume_rebalance(&self, index_uid: &str) -> Result<(), String> {\n1500\t let job_id = RebalanceJobId::new(index_uid);\n1501\t let mut jobs = self.jobs.write().await;\n1502\t\n1503\t if let Some(job) = jobs.get_mut(&job_id) {\n1504\t job.paused = false;\n1505\t info!(index_uid = %index_uid, \"resumed rebalance\");\n1506\t Ok(())\n1507\t } else {\n1508\t Err(format!(\"no rebalance job found for index {}\", index_uid))\n1509\t }\n1510\t }\n1511\t\n1512\t /// Load persisted jobs from task store on startup.\n1513\t pub async fn load_persisted_jobs(&self) -> Result<(), String> {\n1514\t let jobs = tokio::task::spawn_blocking({\n1515\t let task_store = self.task_store.clone();\n1516\t move || {\n1517\t task_store.list_jobs_by_state(\"running\")\n1518\t }\n1519\t })\n1520\t .await\n1521\t .map_err(|e| format!(\"failed to list jobs: {}\", e))?\n1522\t .map_err(|e| format!(\"failed to list jobs: {}\", e))?;\n1523\t\n1524\t for job_row in jobs {\n1525\t if job_row.type_ == \"rebalance\" {\n1526\t if let Ok(job) = serde_json::from_str::(&job_row.params) {\n1527\t info!(\n1528\t index_uid = %job.index_uid,\n1529\t \"loaded persisted rebalance job\"\n1530\t );\n1531\t let mut jobs = self.jobs.write().await;\n1532\t jobs.insert(job.id.clone(), job);\n1533\t }\n1534\t }\n1535\t }\n1536\t\n1537\t Ok(())\n1538\t }\n1539\t}\n1540\t\n1541\t/// Status of the rebalancer worker for monitoring.\n1542\t#[derive(Debug, Clone, Serialize, Deserialize)]\n1543\tpub struct RebalancerWorkerStatus {\n1544\t /// Number of active rebalance jobs.\n1545\t pub active_jobs: usize,\n1546\t /// Number of completed rebalance jobs.\n1547\t pub completed_jobs: usize,\n1548\t /// Number of paused rebalance jobs.\n1549\t pub paused_jobs: usize,\n1550\t /// Total number of shards across all jobs.\n1551\t pub total_shards: usize,\n1552\t /// Number of completed shard migrations.\n1553\t pub completed_shards: usize,\n1554\t}\n1555\t\n1556\t/// Get current time in milliseconds since Unix epoch.\n1557\tfn now_ms() -> i64 {\n1558\t std::time::SystemTime::now()\n1559\t .duration_since(std::time::UNIX_EPOCH)\n1560\t .unwrap_or_default()\n1561\t .as_millis() as i64\n1562\t}\n1563\t\n1564\t/// Convert a topology NodeId to a migration NodeId.\n1565\tfn topo_to_migration_node_id(id: &TopologyNodeId) -> MigrationNodeId {\n1566\t crate::migration::NodeId(id.as_str().to_string())\n1567\t}\n1568\t\n1569\t/// Convert a migration NodeId to a topology NodeId.\n1570\tfn migration_to_topo_node_id(id: &MigrationNodeId) -> TopologyNodeId {\n1571\t TopologyNodeId::new(id.0.clone())\n1572\t}\n1573\t\n1574\t/// Get the old node owner for a specific shard.\n1575\tfn old_node_owners_for_shard(old_owners: &HashMap, shard_id: u32) -> MigrationNodeId {\n1576\t old_owners.get(&ShardId(shard_id))\n1577\t .cloned()\n1578\t .unwrap_or_else(|| crate::migration::NodeId(\"unknown\".to_string()))\n1579\t}\n1580\t\n1581\t#[cfg(test)]\n1582\tmod tests {\n1583\t use super::*;\n1584\t use crate::config::MiroirConfig;\n1585\t use crate::migration::MigrationConfig;\n1586\t use crate::topology::Node;\n1587\t use std::sync::Arc;\n1588\t\n1589\t fn test_topology() -> Topology {\n1590\t let mut topo = Topology::new(64, 2, 2);\n1591\t topo.add_node(Node::new(\n1592\t TopologyNodeId::new(\"node-0\".into()),\n1593\t \"http://node-0:7700\".into(),\n1594\t 0,\n1595\t ));\n1596\t topo.add_node(Node::new(\n1597\t TopologyNodeId::new(\"node-1\".into()),\n1598\t \"http://node-1:7700\".into(),\n1599\t 0,\n1600\t ));\n1601\t topo.add_node(Node::new(\n1602\t TopologyNodeId::new(\"node-2\".into()),\n1603\t \"http://node-2:7700\".into(),\n1604\t 1,\n1605\t ));\n1606\t topo.add_node(Node::new(\n1607\t TopologyNodeId::new(\"node-3\".into()),\n1608\t \"http://node-3:7700\".into(),\n1609\t 1,\n1610\t ));\n1611\t topo\n1612\t }\n1613\t\n1614\t #[test]\n1615\t fn test_rebalance_job_id() {\n1616\t let job_id = RebalanceJobId::new(\"test-index\");\n1617\t assert_eq!(job_id.0, \"rebalance:test-index\");\n1618\t assert_eq!(job_id.index_uid(), \"test-index\");\n1619\t }\n1620\t\n1621\t #[test]\n1622\t fn test_worker_config_default() {\n1623\t let config = RebalancerWorkerConfig::default();\n1624\t assert_eq!(config.max_concurrent_migrations, 4);\n1625\t assert_eq!(config.lease_ttl_secs, LEASE_TTL_SECS);\n1626\t assert_eq!(config.lease_renewal_interval_ms, LEASE_RENEWAL_INTERVAL_MS);\n1627\t }\n1628\t\n1629\t #[tokio::test]\n1630\t async fn test_compute_affected_shards_for_add() {\n1631\t let topo = Arc::new(RwLock::new(test_topology()));\n1632\t let config = RebalancerWorkerConfig::default();\n1633\t\n1634\t // Create a mock task store (in-memory for testing)\n1635\t // Note: This would need a proper mock TaskStore implementation\n1636\t // For now, we'll skip the full integration test\n1637\t\n1638\t // Test that adding a node to group 0 affects some shards\n1639\t let new_node_id = \"node-new\";\n1640\t let replica_group = 0;\n1641\t\n1642\t // We'd need to instantiate the worker with a proper mock task store\n1643\t // This is a placeholder for the actual test\n1644\t }\n1645\t\n1646\t #[test]\n1647\t fn test_shard_migration_phase_serialization() {\n1648\t let phase = ShardMigrationPhase::MigrationInProgress;\n1649\t let json = serde_json::to_string(&phase).unwrap();\n1650\t assert!(json.contains(\"MigrationInProgress\"));\n1651\t\n1652\t let deserialized: ShardMigrationPhase = serde_json::from_str(&json).unwrap();\n1653\t assert_eq!(deserialized, phase);\n1654\t }\n1655\t\n1656\t #[test]\n1657\t fn test_topology_event_serialization() {\n1658\t let event = TopologyChangeEvent::NodeAdded {\n1659\t node_id: \"node-4\".to_string(),\n1660\t replica_group: 0,\n1661\t index_uid: \"test\".to_string(),\n1662\t };\n1663\t\n1664\t let json = serde_json::to_string(&event).unwrap();\n1665\t assert!(json.contains(\"NodeAdded\"));\n1666\t\n1667\t let deserialized: TopologyChangeEvent = serde_json::from_str(&json).unwrap();\n1668\t match deserialized {\n1669\t TopologyChangeEvent::NodeAdded {\n1670\t node_id,\n1671\t replica_group,\n1672\t index_uid,\n1673\t } => {\n1674\t assert_eq!(node_id, \"node-4\");\n1675\t assert_eq!(replica_group, 0);\n1676\t assert_eq!(index_uid, \"test\");\n1677\t }\n1678\t _ => panic!(\"wrong event type\"),\n1679\t }\n1680\t }\n1681\t}\n1682\t"}]},"parent_tool_use_id":null,"session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","uuid":"9918a371-b252-4990-9feb-7cc04d248e81","timestamp":"2026-05-23T05:58:09.896Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/crates/miroir-core/src/rebalancer_worker/mod.rs","content":"//! Rebalancer background worker with advisory lock.\n//!\n//! Implements plan §4 \"Rebalancer\" background task:\n//! - Advisory lock via leader_lease (only one pod runs the rebalancer)\n//! - Reacts to topology change events (node add/drain/fail/recover)\n//! - Computes affected shards using the Phase 1 router\n//! - Drives the migration state machine for each affected shard\n//! - Updates Prometheus metrics (plan §10)\n//! - Progress persistence via jobs table for resumability\n\nmod drift_reconciler;\n\n#[cfg(test)]\nmod acceptance_tests;\n\n#[cfg(test)]\nmod settings_broadcast_acceptance_tests;\n\npub use drift_reconciler::{DriftReconciler, DriftReconcilerConfig};\n\nuse crate::migration::{MigrationCoordinator, MigrationId, MigrationNodeId, ShardId};\nuse crate::rebalancer::{MigrationExecutor, Rebalancer, RebalancerMetrics};\nuse crate::router::assign_shard_in_group;\nuse crate::task_store::{NewJob, TaskStore};\nuse crate::topology::{NodeId as TopologyNodeId, Topology};\nuse serde::{Deserialize, Serialize};\nuse std::collections::HashMap;\nuse std::sync::Arc;\nuse std::time::{Duration, Instant};\nuse tokio::sync::{mpsc, RwLock};\nuse tracing::{debug, error, info};\n\n/// Callback type for recording rebalancer metrics.\n///\n/// Called when:\n/// - Documents are migrated (count)\n/// - Rebalance starts (in_progress = true)\n/// - Rebalance ends (in_progress = false, duration_secs)\npub type RebalancerMetricsCallback = Arc, Option) + Send + Sync>;\n\n/// Default leader lease TTL in seconds.\nconst LEASE_TTL_SECS: u64 = 10;\n\n/// Default interval for lease renewal checks.\nconst LEASE_RENEWAL_INTERVAL_MS: u64 = 2000;\n\n/// Maximum time to wait for a migration job to complete.\nconst MIGRATION_TIMEOUT_SECS: u64 = 3600;\n\n/// Unique identifier for a rebalance job (per index).\n#[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]\npub struct RebalanceJobId(pub String);\n\nimpl RebalanceJobId {\n /// Create a new rebalance job ID for an index.\n pub fn new(index_uid: &str) -> Self {\n Self(format!(\"rebalance:{}\", index_uid))\n }\n\n /// Get the index UID from the job ID.\n pub fn index_uid(&self) -> &str {\n self.0.strip_prefix(\"rebalance:\").unwrap_or(&self.0)\n }\n}\n\n/// Topology change event that triggers rebalancing.\n#[derive(Debug, Clone, Serialize, Deserialize)]\npub enum TopologyChangeEvent {\n /// A new node was added to a replica group.\n NodeAdded {\n node_id: String,\n replica_group: u32,\n index_uid: String,\n },\n /// A node is being drained (preparing for removal).\n NodeDraining {\n node_id: String,\n replica_group: u32,\n index_uid: String,\n },\n /// A node failed and needs recovery.\n NodeFailed {\n node_id: String,\n replica_group: u32,\n index_uid: String,\n },\n /// A node recovered after failure.\n NodeRecovered {\n node_id: String,\n replica_group: u32,\n index_uid: String,\n },\n}\n\n/// Per-shard migration progress for persistence.\n#[derive(Debug, Clone, Serialize, Deserialize)]\npub struct ShardMigrationProgress {\n /// Shard ID.\n pub shard_id: u32,\n /// Current phase.\n pub phase: String,\n /// Documents migrated so far.\n pub docs_migrated: u64,\n /// Last offset for pagination resume.\n pub last_offset: u32,\n /// Source node for migration.\n pub source_node: Option,\n /// Target node for migration.\n pub target_node: String,\n}\n\n/// Per-shard migration state for the worker.\n#[derive(Debug, Clone, Serialize, Deserialize)]\nstruct ShardState {\n /// Current phase.\n phase: ShardMigrationPhase,\n /// Documents migrated so far.\n docs_migrated: u64,\n /// Last offset for pagination resume.\n last_offset: u32,\n /// Source node for migration.\n source_node: Option,\n /// Target node for migration.\n target_node: String,\n /// When this shard migration started.\n #[serde(skip, default = \"Instant::now\")]\n started_at: Instant,\n}\n\n/// Migration phases for a single shard.\n#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]\npub enum ShardMigrationPhase {\n /// Waiting to start.\n Idle,\n /// Dual-write active.\n DualWriteStarted,\n /// Background migration in progress.\n MigrationInProgress,\n /// Migration complete, preparing cutover.\n MigrationComplete,\n /// Dual-write stopped.\n DualWriteStopped,\n /// Old replica deleted.\n OldReplicaDeleted,\n /// Migration failed.\n Failed,\n}\n\n/// State machine for a rebalance job (per index).\n#[derive(Debug, Clone, Serialize, Deserialize)]\nstruct RebalanceJob {\n /// Job ID.\n id: RebalanceJobId,\n /// Index UID being rebalanced.\n index_uid: String,\n /// Replica group being rebalanced.\n replica_group: u32,\n /// Per-shard migration state.\n shards: HashMap,\n /// Job started at.\n #[serde(skip, default = \"Instant::now\")]\n started_at: Instant,\n /// Job completed at (if finished).\n #[serde(skip, default)]\n completed_at: Option,\n /// Total documents migrated.\n total_docs_migrated: u64,\n /// Whether the job is paused.\n paused: bool,\n}\n\n/// Configuration for the rebalancer worker.\n#[derive(Debug, Clone, Serialize, Deserialize)]\npub struct RebalancerWorkerConfig {\n /// Maximum concurrent migrations (plan §14.2 memory budget).\n pub max_concurrent_migrations: u32,\n /// Leader lease TTL in seconds.\n pub lease_ttl_secs: u64,\n /// Lease renewal interval in milliseconds.\n pub lease_renewal_interval_ms: u64,\n /// Migration batch size.\n pub migration_batch_size: u32,\n /// Delay between migration batches (ms).\n pub migration_batch_delay_ms: u64,\n /// Channel capacity for topology events.\n pub event_channel_capacity: usize,\n}\n\nimpl Default for RebalancerWorkerConfig {\n fn default() -> Self {\n Self {\n max_concurrent_migrations: 4,\n lease_ttl_secs: LEASE_TTL_SECS,\n lease_renewal_interval_ms: LEASE_RENEWAL_INTERVAL_MS,\n migration_batch_size: 1000,\n migration_batch_delay_ms: 100,\n event_channel_capacity: 100,\n }\n }\n}\n\n/// The rebalancer background worker.\n///\n/// Runs as a Tokio task, acquires a leader lease, and processes topology\n/// change events to drive shard migrations.\npub struct RebalancerWorker {\n config: RebalancerWorkerConfig,\n topology: Arc>,\n task_store: Arc,\n _rebalancer: Arc, // Reserved for future use\n migration_coordinator: Arc>,\n migration_executor: Option>,\n metrics: Arc>,\n pod_id: String,\n /// Sender for topology change events.\n event_tx: mpsc::Sender,\n /// Active rebalance jobs (per index).\n jobs: Arc>>,\n /// Receiver for topology change events (cloned for internal use).\n event_rx: Arc>>>,\n /// Callback for recording Prometheus metrics.\n metrics_callback: Option,\n}\n\nimpl RebalancerWorker {\n /// Create a new rebalancer worker.\n pub fn new(\n config: RebalancerWorkerConfig,\n topology: Arc>,\n task_store: Arc,\n rebalancer: Arc, // Reserved for future use\n migration_coordinator: Arc>,\n metrics: Arc>,\n pod_id: String,\n ) -> Self {\n Self::with_metrics(config, topology, task_store, rebalancer, migration_coordinator, metrics, pod_id, None)\n }\n\n /// Create a new rebalancer worker with metrics callback.\n pub fn with_metrics(\n config: RebalancerWorkerConfig,\n topology: Arc>,\n task_store: Arc,\n rebalancer: Arc, // Reserved for future use\n migration_coordinator: Arc>,\n metrics: Arc>,\n pod_id: String,\n metrics_callback: Option,\n ) -> Self {\n let (event_tx, event_rx) = mpsc::channel(config.event_channel_capacity);\n\n Self {\n config,\n topology,\n task_store,\n _rebalancer: rebalancer, // Stored but not currently used\n migration_coordinator,\n migration_executor: None, // Set via with_migration_executor\n metrics,\n pod_id,\n event_tx,\n jobs: Arc::new(RwLock::new(HashMap::new())),\n event_rx: Arc::new(RwLock::new(Some(event_rx))),\n metrics_callback,\n }\n }\n\n /// Set the migration executor (provides HTTP client for actual migrations).\n pub fn with_migration_executor(mut self, executor: Arc) -> Self {\n self.migration_executor = Some(executor);\n self\n }\n\n /// Get a sender for topology change events.\n pub fn event_sender(&self) -> mpsc::Sender {\n self.event_tx.clone()\n }\n\n /// Start the background worker.\n ///\n /// This runs in a loop:\n /// 1. Try to acquire leader lease for each index (scope: rebalance:)\n /// 2. If acquired, process events and run migrations\n /// 3. Renew lease periodically\n /// 4. If lease lost, go back to step 1\n pub async fn run(&self) {\n info!(\n pod_id = %self.pod_id,\n \"rebalancer worker starting\"\n );\n\n loop {\n // Try to acquire leader lease for each index we're managing\n let mut leader_scopes = Vec::new();\n\n // Get all active indexes from current jobs and use default scope\n let jobs = self.jobs.read().await;\n let mut index_uids: Vec = jobs.values()\n .map(|j| j.index_uid.clone())\n .collect();\n\n // Always include \"default\" scope for rebalancer operations\n index_uids.push(\"default\".to_string());\n drop(jobs);\n\n // Build scopes for each index: rebalance:\n let scopes: Vec = index_uids\n .into_iter()\n .map(|uid| format!(\"rebalance:{}\", uid))\n .collect();\n\n let mut acquired_any = false;\n for scope in &scopes {\n let now_ms = now_ms();\n let expires_at = now_ms + (self.config.lease_ttl_secs * 1000) as i64;\n\n match tokio::task::spawn_blocking({\n let task_store = self.task_store.clone();\n let scope = scope.clone();\n let pod_id = self.pod_id.clone();\n move || {\n task_store.try_acquire_leader_lease(&scope, &pod_id, expires_at, now_ms)\n }\n })\n .await\n {\n Ok(Ok(true)) => {\n info!(scope = %scope, pod_id = %self.pod_id, \"acquired leader lease\");\n leader_scopes.push(scope.clone());\n acquired_any = true;\n }\n Ok(Ok(false)) => {\n debug!(scope = %scope, \"leader lease already held\");\n }\n Ok(Err(e)) => {\n error!(scope = %scope, error = %e, \"failed to acquire leader lease\");\n }\n Err(e) => {\n error!(scope = %scope, error = %e, \"spawn_blocking task failed\");\n }\n }\n }\n\n if acquired_any {\n // We are the leader - update rebalancer metrics\n {\n let mut metrics = self.metrics.write().await;\n metrics.start_rebalance();\n }\n\n // Call metrics callback for rebalance start\n if let Some(ref callback) = self.metrics_callback {\n callback(true, None, None);\n }\n\n // We are the leader - run the main loop\n if let Err(e) = self.run_leader_loop(&leader_scopes).await {\n error!(error = %e, \"leader loop failed\");\n }\n\n // Clear rebalancer in-progress status on exit\n {\n let mut metrics = self.metrics.write().await;\n metrics.end_rebalance();\n }\n\n // Call metrics callback for rebalance end\n if let Some(ref callback) = self.metrics_callback {\n callback(false, None, None);\n }\n } else {\n // Not the leader - wait before retrying\n tokio::time::sleep(Duration::from_millis(\n self.config.lease_renewal_interval_ms,\n ))\n .await;\n }\n }\n }\n\n /// Run the leader loop: process events, renew lease, drive migrations.\n async fn run_leader_loop(&self, scopes: &[String]) -> Result<(), String> {\n let mut lease_renewal = tokio::time::interval(Duration::from_millis(\n self.config.lease_renewal_interval_ms,\n ));\n\n // Take the receiver out of the Option\n let mut event_rx = {\n let mut rx_guard = self.event_rx.write().await;\n rx_guard.take().ok_or_else(|| \"event receiver already taken\".to_string())?\n };\n\n let result = async {\n loop {\n tokio::select! {\n // Renew lease periodically\n _ = lease_renewal.tick() => {\n for scope in scopes {\n let now_ms = now_ms();\n let expires_at = now_ms + (self.config.lease_ttl_secs * 1000) as i64;\n\n match tokio::task::spawn_blocking({\n let task_store = self.task_store.clone();\n let scope = scope.clone();\n let pod_id = self.pod_id.clone();\n move || {\n task_store.renew_leader_lease(&scope, &pod_id, expires_at)\n }\n })\n .await\n {\n Ok(Ok(true)) => {\n debug!(scope = %scope, \"renewed leader lease\");\n }\n Ok(Ok(false)) => {\n info!(scope = %scope, \"lost leader lease\");\n return Ok::<(), String>(()); // Exit loop, will retry acquisition\n }\n Ok(Err(e)) => {\n error!(scope = %scope, error = %e, \"failed to renew lease\");\n return Err(format!(\"lease renewal failed: {}\", e));\n }\n Err(e) => {\n error!(scope = %scope, error = %e, \"spawn_blocking task failed\");\n return Err(format!(\"lease renewal task failed: {}\", e));\n }\n }\n }\n }\n\n // Process topology change events\n Some(event) = event_rx.recv() => {\n if let Err(e) = self.handle_topology_event(event).await {\n error!(error = %e, \"failed to handle topology event\");\n }\n }\n\n // Drive active migrations\n _ = tokio::time::sleep(Duration::from_millis(100)) => {\n if let Err(e) = self.drive_migrations().await {\n error!(error = %e, \"failed to drive migrations\");\n }\n }\n }\n }\n }.await;\n\n // Put the receiver back for retry logic\n {\n let mut rx_guard = self.event_rx.write().await;\n if rx_guard.is_none() {\n *rx_guard = Some(event_rx);\n }\n }\n\n result\n }\n\n /// Handle a topology change event.\n async fn handle_topology_event(&self, event: TopologyChangeEvent) -> Result<(), String> {\n info!(event = ?event, \"handling topology change event\");\n\n match event {\n TopologyChangeEvent::NodeAdded {\n node_id,\n replica_group,\n index_uid,\n } => {\n self.on_node_added(&node_id, replica_group, &index_uid)\n .await?\n }\n TopologyChangeEvent::NodeDraining {\n node_id,\n replica_group,\n index_uid,\n } => {\n self.on_node_draining(&node_id, replica_group, &index_uid)\n .await?\n }\n TopologyChangeEvent::NodeFailed {\n node_id,\n replica_group,\n index_uid,\n } => {\n self.on_node_failed(&node_id, replica_group, &index_uid)\n .await?\n }\n TopologyChangeEvent::NodeRecovered {\n node_id,\n replica_group,\n index_uid,\n } => {\n self.on_node_recovered(&node_id, replica_group, &index_uid)\n .await?\n }\n }\n\n Ok(())\n }\n\n /// Handle node addition: compute affected shards and create job to track migration.\n async fn on_node_added(\n &self,\n node_id: &str,\n replica_group: u32,\n index_uid: &str,\n ) -> Result<(), String> {\n let job_id = RebalanceJobId::new(index_uid);\n\n // Check if we already have a job for this index\n {\n let jobs = self.jobs.read().await;\n if jobs.contains_key(&job_id) {\n debug!(index_uid = %index_uid, \"rebalance job already exists\");\n return Ok(());\n }\n }\n\n // Compute affected shards using the Phase 1 router\n let affected_shards = self.compute_affected_shards_for_add(node_id, replica_group).await?;\n\n if affected_shards.is_empty() {\n info!(\n node_id = %node_id,\n replica_group = replica_group,\n \"no shards need migration for node addition\"\n );\n return Ok(());\n }\n\n info!(\n node_id = %node_id,\n replica_group = replica_group,\n shard_count = affected_shards.len(),\n \"computed affected shards for node addition\"\n );\n\n // Build migration state: shard -> old owner mapping\n let mut old_owners = HashMap::new();\n let mut shard_states = HashMap::new();\n for (shard_id, source_node) in &affected_shards {\n old_owners.insert(ShardId(*shard_id), topo_to_migration_node_id(source_node));\n shard_states.insert(\n *shard_id,\n ShardState {\n phase: ShardMigrationPhase::Idle,\n docs_migrated: 0,\n last_offset: 0,\n source_node: Some(source_node.to_string()),\n target_node: node_id.to_string(),\n started_at: Instant::now(),\n },\n );\n }\n\n // Create migration in coordinator for state tracking and dual-write\n let migration_id = {\n let mut coordinator = self.migration_coordinator.write().await;\n let new_node = topo_to_migration_node_id(&TopologyNodeId::new(node_id.to_string()));\n coordinator.begin_migration(new_node, replica_group, old_owners)\n .map_err(|e| format!(\"failed to create migration: {}\", e))?\n };\n\n // Start dual-write immediately so the router starts writing to both nodes\n {\n let mut coordinator = self.migration_coordinator.write().await;\n coordinator.begin_dual_write(migration_id)\n .map_err(|e| format!(\"failed to start dual-write: {}\", e))?;\n }\n\n let job = RebalanceJob {\n id: job_id.clone(),\n index_uid: index_uid.to_string(),\n replica_group,\n shards: shard_states,\n started_at: Instant::now(),\n completed_at: None,\n total_docs_migrated: 0,\n paused: false,\n };\n\n // Persist job to task store\n self.persist_job(&job).await?;\n\n // Store in memory\n let mut jobs = self.jobs.write().await;\n jobs.insert(job_id.clone(), job);\n\n info!(\n migration_id = %migration_id,\n shard_count = affected_shards.len(),\n \"created migration for node addition\"\n );\n\n Ok(())\n }\n\n /// Handle node draining: compute destination shards and create job to track migration.\n async fn on_node_draining(\n &self,\n node_id: &str,\n replica_group: u32,\n index_uid: &str,\n ) -> Result<(), String> {\n let job_id = RebalanceJobId::new(index_uid);\n\n // Compute shard destinations\n let shard_destinations = self\n .compute_shard_destinations_for_drain(node_id, replica_group)\n .await?;\n\n if shard_destinations.is_empty() {\n info!(\n node_id = %node_id,\n replica_group = replica_group,\n \"no shards need migration for node drain\"\n );\n return Ok(());\n }\n\n info!(\n node_id = %node_id,\n replica_group = replica_group,\n shard_count = shard_destinations.len(),\n \"computed shard destinations for node drain\"\n );\n\n // Build migration state: shard -> old owner (draining node) mapping\n let mut old_owners = HashMap::new();\n let mut shard_states = HashMap::new();\n for (shard_id, dest_node) in &shard_destinations {\n old_owners.insert(ShardId(*shard_id), topo_to_migration_node_id(&TopologyNodeId::new(node_id.to_string())));\n shard_states.insert(\n *shard_id,\n ShardState {\n phase: ShardMigrationPhase::Idle,\n docs_migrated: 0,\n last_offset: 0,\n source_node: Some(node_id.to_string()),\n target_node: dest_node.to_string(),\n started_at: Instant::now(),\n },\n );\n }\n\n // Create migration in coordinator for state tracking and dual-write\n let migration_id = {\n let mut coordinator = self.migration_coordinator.write().await;\n // For drain, the destination node becomes the \"new\" node in the migration\n if let Some((_, first_dest)) = shard_destinations.first() {\n let new_node = topo_to_migration_node_id(first_dest);\n coordinator.begin_migration(new_node, replica_group, old_owners)\n .map_err(|e| format!(\"failed to create migration: {}\", e))?\n } else {\n return Err(\"no shards to migrate\".to_string());\n }\n };\n\n // Start dual-write immediately\n {\n let mut coordinator = self.migration_coordinator.write().await;\n coordinator.begin_dual_write(migration_id)\n .map_err(|e| format!(\"failed to start dual-write: {}\", e))?;\n }\n\n let job = RebalanceJob {\n id: job_id.clone(),\n index_uid: index_uid.to_string(),\n replica_group,\n shards: shard_states,\n started_at: Instant::now(),\n completed_at: None,\n total_docs_migrated: 0,\n paused: false,\n };\n\n // Persist job to task store\n self.persist_job(&job).await?;\n\n // Store in memory\n let mut jobs = self.jobs.write().await;\n jobs.insert(job_id.clone(), job);\n\n info!(\n migration_id = %migration_id,\n shard_count = shard_destinations.len(),\n \"created migration for node drain\"\n );\n\n Ok(())\n }\n\n /// Handle node failure.\n async fn on_node_failed(\n &self,\n node_id: &str,\n replica_group: u32,\n index_uid: &str,\n ) -> Result<(), String> {\n info!(\n node_id = %node_id,\n replica_group = replica_group,\n index_uid = %index_uid,\n \"handling node failure\"\n );\n\n // Mark node as failed in topology\n let node_id_obj = TopologyNodeId::new(node_id.to_string());\n {\n let mut topo = self.topology.write().await;\n if let Some(node) = topo.node_mut(&node_id_obj) {\n node.status = crate::topology::NodeStatus::Failed;\n }\n }\n\n // TODO: Schedule replication to restore RF if needed\n // For now, just log the failure\n Ok(())\n }\n\n /// Handle node recovery.\n async fn on_node_recovered(\n &self,\n node_id: &str,\n replica_group: u32,\n index_uid: &str,\n ) -> Result<(), String> {\n info!(\n node_id = %node_id,\n replica_group = replica_group,\n index_uid = %index_uid,\n \"handling node recovery\"\n );\n\n // Mark node as active in topology\n let node_id_obj = TopologyNodeId::new(node_id.to_string());\n {\n let mut topo = self.topology.write().await;\n if let Some(node) = topo.node_mut(&node_id_obj) {\n node.status = crate::topology::NodeStatus::Active;\n }\n }\n\n // TODO: If auto_rebalance_on_recovery is enabled, trigger rebalancing\n\n Ok(())\n }\n\n /// Compute which shards are affected by adding a new node.\n /// Returns shard -> source_node mapping for shards that will move.\n async fn compute_affected_shards_for_add(\n &self,\n new_node_id: &str,\n replica_group: u32,\n ) -> Result, String> {\n let topo = self.topology.read().await;\n let new_node_id = TopologyNodeId::new(new_node_id.to_string());\n let rf = topo.rf();\n\n // Find the target group\n let group = topo\n .groups()\n .find(|g| g.id == replica_group)\n .ok_or_else(|| format!(\"replica group {} not found\", replica_group))?;\n\n let existing_nodes: Vec<_> = group.nodes().iter().cloned().collect();\n let mut affected_shards = Vec::new();\n\n // For each shard, check if adding the new node would change the assignment\n for shard_id in 0..topo.shards {\n let old_assignment: Vec<_> =\n assign_shard_in_group(shard_id, &existing_nodes, rf);\n\n // New assignment with the new node included\n let all_nodes: Vec<_> = existing_nodes\n .iter()\n .cloned()\n .chain(std::iter::once(new_node_id.clone()))\n .collect();\n let new_assignment: Vec<_> = assign_shard_in_group(shard_id, &all_nodes, rf);\n\n // Check if the new node is in the new assignment\n if new_assignment.contains(&new_node_id) {\n // This shard moves to the new node\n if let Some(old_owner) = old_assignment.first() {\n affected_shards.push((shard_id, old_owner.clone()));\n }\n }\n }\n\n Ok(affected_shards)\n }\n\n /// Compute where each shard should go when draining a node.\n /// Returns shard -> destination_node mapping.\n async fn compute_shard_destinations_for_drain(\n &self,\n drain_node_id: &str,\n replica_group: u32,\n ) -> Result, String> {\n let topo = self.topology.read().await;\n let drain_node_id = TopologyNodeId::new(drain_node_id.to_string());\n let rf = topo.rf();\n\n // Find the target group\n let group = topo\n .groups()\n .find(|g| g.id == replica_group)\n .ok_or_else(|| format!(\"replica group {} not found\", replica_group))?;\n\n let other_nodes: Vec<_> = group\n .nodes()\n .iter()\n .filter(|n| **n != drain_node_id)\n .cloned()\n .collect();\n\n if other_nodes.is_empty() {\n return Err(\"cannot remove last node in group\".to_string());\n }\n\n let mut destinations = Vec::new();\n\n // For each shard, find a new owner among the remaining nodes\n for shard_id in 0..topo.shards {\n let assignment: Vec<_> = assign_shard_in_group(shard_id, group.nodes(), rf);\n\n if assignment.contains(&drain_node_id) {\n // This shard needs a new home\n let mut best_node = None;\n let mut best_score = 0u64;\n\n for node in &other_nodes {\n let s = crate::router::score(shard_id, node.as_str());\n if s > best_score {\n best_score = s;\n best_node = Some(node.clone());\n }\n }\n\n if let Some(dest) = best_node {\n destinations.push((shard_id, dest));\n }\n }\n }\n\n Ok(destinations)\n }\n\n /// Drive active migrations forward.\n async fn drive_migrations(&self) -> Result<(), String> {\n let jobs = self.jobs.read().await;\n let mut active_jobs = Vec::new();\n\n for (job_id, job) in jobs.iter() {\n if job.paused || job.completed_at.is_some() {\n continue;\n }\n\n // Count how many shards are actively migrating\n let migrating_count = job\n .shards\n .values()\n .filter(|s| {\n matches!(\n s.phase,\n ShardMigrationPhase::MigrationInProgress\n | ShardMigrationPhase::DualWriteStarted\n )\n })\n .count();\n\n if migrating_count < self.config.max_concurrent_migrations as usize {\n active_jobs.push((job_id.clone(), job.clone()));\n }\n }\n\n // Drop read lock before processing\n drop(jobs);\n\n // Process up to max_concurrent_migrations jobs\n for (job_id, job) in active_jobs\n .into_iter()\n .take(self.config.max_concurrent_migrations as usize)\n {\n if let Err(e) = self.process_job(&job_id).await {\n error!(job_id = %job_id.0, error = %e, \"failed to process job\");\n }\n }\n\n Ok(())\n }\n\n /// Emit Prometheus metrics for the current rebalancer state.\n pub async fn emit_metrics(&self) {\n let jobs = self.jobs.read().await;\n\n // Calculate total documents migrated across all jobs\n let total_docs: u64 = jobs.values()\n .map(|j| j.total_docs_migrated)\n .sum();\n\n // Check if any rebalance is in progress\n let in_progress = jobs.values().any(|j| j.completed_at.is_none() && !j.paused);\n\n drop(jobs);\n\n // Update internal metrics\n {\n let mut metrics = self.metrics.write().await;\n if in_progress {\n metrics.start_rebalance();\n } else {\n metrics.end_rebalance();\n }\n // Note: documents_migrated_total is already tracked in RebalancerMetrics\n // and synced to Prometheus via the health checker\n let _ = total_docs;\n }\n\n // Call metrics callback for rebalance status\n if let Some(ref callback) = self.metrics_callback {\n callback(in_progress, None, None);\n }\n }\n\n /// Get the current rebalancer status for monitoring.\n pub async fn get_status(&self) -> RebalancerWorkerStatus {\n let jobs = self.jobs.read().await;\n\n let active_jobs = jobs.values()\n .filter(|j| j.completed_at.is_none() && !j.paused)\n .count();\n\n let completed_jobs = jobs.values()\n .filter(|j| j.completed_at.is_some())\n .count();\n\n let paused_jobs = jobs.values()\n .filter(|j| j.paused)\n .count();\n\n let total_shards: usize = jobs.values()\n .map(|j| j.shards.len())\n .sum();\n\n let completed_shards: usize = jobs.values()\n .map(|j| j.shards.values().filter(|s| s.phase == ShardMigrationPhase::OldReplicaDeleted).count())\n .sum();\n\n RebalancerWorkerStatus {\n active_jobs,\n completed_jobs,\n paused_jobs,\n total_shards,\n completed_shards,\n }\n }\n\n /// Process a single rebalance job.\n ///\n /// Drives the migration state machine forward for each shard in the job.\n /// This is the core method that advances migrations through their phases.\n async fn process_job(&self, job_id: &RebalanceJobId) -> Result<(), String> {\n // Get job (cloned to avoid holding lock)\n let job = {\n let jobs = self.jobs.read().await;\n jobs.get(job_id).cloned()\n };\n\n let mut job = match job {\n Some(j) => j,\n None => return Ok(()), // Job may have been removed\n };\n\n // Skip paused or completed jobs\n if job.paused || job.completed_at.is_some() {\n return Ok(());\n }\n\n // Sync worker job state with MigrationCoordinator state\n // This ensures we resume from the correct phase after a pod restart\n self.sync_job_with_coordinator(&mut job).await?;\n\n // Get the migration from the coordinator for this job\n let migration_id = {\n let coordinator = self.migration_coordinator.read().await;\n let mut found_id = None;\n for (mid, state) in coordinator.get_all_migrations() {\n // Match by index_uid and replica_group\n if state.replica_group == job.replica_group {\n found_id = Some(*mid);\n break;\n }\n }\n found_id.ok_or_else(|| \"no migration found for this job\".to_string())?\n };\n\n // Get migration state to access node addresses\n let (new_node, old_owners) = {\n let coordinator = self.migration_coordinator.read().await;\n let state = coordinator.get_state(migration_id)\n .ok_or_else(|| \"migration state not found\".to_string())?;\n (state.new_node.clone(), state.old_owners.clone())\n };\n\n // Get node addresses from topology\n let (new_node_address, old_owner_addresses) = {\n let topo = self.topology.read().await;\n let new_addr = topo.node(&migration_to_topo_node_id(&new_node))\n .ok_or_else(|| format!(\"new node not found: {}\", new_node.0))?\n .address.clone();\n\n let mut old_addrs = HashMap::new();\n for (shard, old_node) in &old_owners {\n if let Some(node) = topo.node(&migration_to_topo_node_id(old_node)) {\n old_addrs.insert(*shard, node.address.clone());\n }\n }\n\n (new_addr, old_addrs)\n };\n\n // Use a default index for now - in production, this would come from config\n let index_uid = \"default\".to_string();\n\n // Drive migrations forward for each shard\n let mut updated = false;\n let mut total_docs_migrated = 0u64;\n\n // Limit concurrent migrations to stay within memory budget\n let mut active_count = 0;\n\n for (&shard_id, shard_state) in job.shards.iter_mut() {\n // Check concurrent migration limit\n if active_count >= self.config.max_concurrent_migrations as usize {\n break;\n }\n\n match shard_state.phase {\n ShardMigrationPhase::Idle => {\n // Already started dual-write in on_node_added/on_node_draining\n shard_state.phase = ShardMigrationPhase::DualWriteStarted;\n updated = true;\n }\n ShardMigrationPhase::DualWriteStarted => {\n // Start background migration\n if let Some(ref executor) = self.migration_executor {\n if let Some(old_address) = old_owner_addresses.get(&ShardId(shard_id)) {\n let old_node = old_owners.get(&ShardId(shard_id))\n .cloned()\n .unwrap_or_else(|| crate::migration::NodeId(\"unknown\".to_string()));\n if let Err(e) = self.execute_background_migration(\n executor,\n migration_id,\n shard_id,\n &old_node,\n old_address,\n &new_node.0,\n &new_node_address,\n &index_uid,\n ).await {\n error!(shard_id, error = %e, \"failed to execute background migration\");\n shard_state.phase = ShardMigrationPhase::Failed;\n } else {\n shard_state.phase = ShardMigrationPhase::MigrationInProgress;\n active_count += 1;\n updated = true;\n }\n }\n } else {\n // No executor - skip directly to complete for testing\n shard_state.docs_migrated = 1000; // Simulated\n shard_state.phase = ShardMigrationPhase::MigrationComplete;\n updated = true;\n }\n }\n ShardMigrationPhase::MigrationInProgress => {\n // Check if migration is complete by querying the coordinator\n let complete = self.check_migration_complete_for_shard(shard_id).await?;\n if complete {\n shard_state.phase = ShardMigrationPhase::MigrationComplete;\n active_count -= 1; // One less active migration\n updated = true;\n }\n }\n ShardMigrationPhase::MigrationComplete => {\n // Begin cutover sequence\n if let Err(e) = self.begin_cutover_for_shard(shard_id).await {\n error!(shard_id, error = %e, \"failed to begin cutover\");\n } else {\n shard_state.phase = ShardMigrationPhase::DualWriteStopped;\n updated = true;\n }\n }\n ShardMigrationPhase::DualWriteStopped => {\n // Complete cutover and delete old replica\n if let Err(e) = self.complete_cutover_for_shard(shard_id).await {\n error!(shard_id, error = %e, \"failed to complete cutover\");\n } else {\n shard_state.phase = ShardMigrationPhase::OldReplicaDeleted;\n updated = true;\n }\n }\n ShardMigrationPhase::OldReplicaDeleted => {\n // Migration complete for this shard\n }\n ShardMigrationPhase::Failed => {\n // Migration failed - skip this shard\n }\n }\n\n total_docs_migrated += shard_state.docs_migrated;\n }\n\n // Update total docs migrated for the job\n job.total_docs_migrated = total_docs_migrated;\n\n // Update metrics\n {\n let mut metrics = self.metrics.write().await;\n metrics.record_documents_migrated(total_docs_migrated);\n }\n\n // Call metrics callback for documents migrated\n if let Some(ref callback) = self.metrics_callback {\n callback(false, Some(total_docs_migrated), None);\n }\n\n // Check if job is complete (all shards in final state)\n let all_complete = job.shards.values().all(|s| {\n matches!(s.phase, ShardMigrationPhase::OldReplicaDeleted | ShardMigrationPhase::Failed)\n });\n\n if all_complete && job.completed_at.is_none() {\n job.completed_at = Some(Instant::now());\n\n // Record final duration metric\n let duration = job.started_at.elapsed().as_secs_f64();\n {\n let mut metrics = self.metrics.write().await;\n metrics.end_rebalance();\n info!(\n job_id = %job_id.0,\n duration_secs = duration,\n \"rebalance job completed\"\n );\n }\n\n // Call metrics callback for rebalance completion with duration\n if let Some(ref callback) = self.metrics_callback {\n callback(false, None, Some(duration));\n }\n\n // Update job in memory\n let mut jobs = self.jobs.write().await;\n jobs.insert(job_id.clone(), job.clone());\n\n // Persist to task store\n self.persist_job(&job).await?;\n\n // Persist progress for each shard\n for shard_id in job.shards.keys() {\n self.persist_job_progress(&job, *shard_id).await?;\n }\n }\n\n Ok(())\n }\n\n /// Persist a job to the task store.\n async fn persist_job(&self, job: &RebalanceJob) -> Result<(), String> {\n let progress = serde_json::to_string(job)\n .map_err(|e| format!(\"failed to serialize job: {}\", e))?;\n\n let new_job = NewJob {\n id: job.id.0.clone(),\n type_: \"rebalance\".to_string(),\n params: progress,\n state: if job.completed_at.is_some() {\n \"completed\".to_string()\n } else if job.paused {\n \"paused\".to_string()\n } else {\n \"running\".to_string()\n },\n progress: format!(\n \"{{\\\"total_shards\\\":{},\\\"completed\\\":{},\\\"docs_migrated\\\":{}}}\",\n job.shards.len(),\n job.shards\n .values()\n .filter(|s| s.phase == ShardMigrationPhase::OldReplicaDeleted)\n .count(),\n job.total_docs_migrated\n ),\n };\n\n tokio::task::spawn_blocking({\n let task_store = self.task_store.clone();\n let new_job = new_job.clone();\n move || {\n task_store.insert_job(&new_job)\n }\n })\n .await\n .map_err(|e| format!(\"failed to persist job: {}\", e))?\n .map_err(|e| format!(\"failed to persist job: {}\", e))?;\n\n Ok(())\n }\n\n /// Persist progress for a single shard.\n async fn persist_job_progress(\n &self,\n job: &RebalanceJob,\n shard_id: u32,\n ) -> Result<(), String> {\n if let Some(shard_state) = job.shards.get(&shard_id) {\n let progress = ShardMigrationProgress {\n shard_id,\n phase: format!(\"{:?}\", shard_state.phase),\n docs_migrated: shard_state.docs_migrated,\n last_offset: shard_state.last_offset,\n source_node: shard_state.source_node.clone(),\n target_node: shard_state.target_node.clone(),\n };\n\n let progress_json =\n serde_json::to_string(&progress)\n .map_err(|e| format!(\"failed to serialize progress: {}\", e))?;\n\n // Update job progress in task store\n tokio::task::spawn_blocking({\n let task_store = self.task_store.clone();\n let job_id = job.id.0.clone();\n let completed_at = format!(\"{:?}\", job.completed_at.is_some());\n let progress_json = progress_json.clone();\n move || {\n task_store.update_job_progress(&job_id, &completed_at, &progress_json)\n }\n })\n .await\n .map_err(|e| format!(\"failed to update job progress: {}\", e))?\n .map_err(|e| format!(\"failed to update job progress: {}\", e))?;\n }\n\n Ok(())\n }\n\n /// Sync worker job state with MigrationCoordinator state.\n ///\n /// This ensures that after a pod restart, the worker's job state reflects\n /// the actual migration state tracked by the coordinator.\n async fn sync_job_with_coordinator(&self, job: &mut RebalanceJob) -> Result<(), String> {\n let coordinator = self.migration_coordinator.read().await;\n\n // For each shard in the job, check if there's a corresponding migration\n // in the coordinator and sync the state\n for (&shard_id, shard_state) in job.shards.iter_mut() {\n let shard = ShardId(shard_id);\n\n // Look for a migration in the coordinator that affects this shard\n for (_mid, migration_state) in coordinator.get_all_migrations() {\n if let Some(migration_shard_state) = migration_state.affected_shards.get(&shard) {\n // Sync the phase based on the migration coordinator state\n use crate::migration::ShardMigrationState as CoordinatorState;\n shard_state.phase = match migration_shard_state {\n CoordinatorState::Pending => ShardMigrationPhase::Idle,\n CoordinatorState::Migrating { .. } => ShardMigrationPhase::MigrationInProgress,\n CoordinatorState::MigrationComplete { docs_copied } => {\n shard_state.docs_migrated = *docs_copied;\n ShardMigrationPhase::MigrationComplete\n }\n CoordinatorState::Draining { .. } => ShardMigrationPhase::DualWriteStopped,\n CoordinatorState::DeltaPass { docs_copied, delta_docs_copied } => {\n shard_state.docs_migrated = docs_copied + delta_docs_copied;\n ShardMigrationPhase::DualWriteStopped\n }\n CoordinatorState::Active => ShardMigrationPhase::OldReplicaDeleted,\n CoordinatorState::Failed { .. } => ShardMigrationPhase::Failed,\n };\n }\n }\n }\n\n Ok(())\n }\n\n /// Start dual-write phase for a shard.\n async fn start_dual_write_for_shard(&self, _replica_group: u32, shard_id: u32) -> Result<(), String> {\n let shard = ShardId(shard_id);\n let mut coordinator = self.migration_coordinator.write().await;\n\n // Find or create the migration for this shard\n // For now, we'll create a new migration if one doesn't exist\n // In production, this would be created when the job is created\n\n info!(\n shard_id,\n \"starting dual-write phase\"\n );\n\n // The dual-write is handled by the router checking is_dual_write_active\n // We just need to ensure the migration coordinator knows about this shard\n Ok(())\n }\n\n /// Begin cutover sequence for a shard.\n async fn begin_cutover_for_shard(&self, shard_id: u32) -> Result<(), String> {\n info!(\n shard_id,\n \"beginning cutover sequence\"\n );\n\n let shard = ShardId(shard_id);\n let mut coordinator = self.migration_coordinator.write().await;\n\n // Collect the migrations that affect this shard first\n let migrations_to_cutover: Vec<_> = coordinator.get_all_migrations()\n .iter()\n .filter(|(_, migration_state)| migration_state.affected_shards.contains_key(&shard))\n .map(|(mid, _)| *mid)\n .collect();\n\n // Now perform the cutover\n for mid in migrations_to_cutover {\n coordinator.begin_cutover(mid).map_err(|e| e.to_string())?;\n break; // Only need to cutover one migration per shard\n }\n\n Ok(())\n }\n\n /// Complete cutover and delete old replica for a shard.\n async fn complete_cutover_for_shard(&self, shard_id: u32) -> Result<(), String> {\n info!(\n shard_id,\n \"completing cutover and deleting old replica\"\n );\n\n let shard = ShardId(shard_id);\n let mut coordinator = self.migration_coordinator.write().await;\n\n // Collect the migrations that affect this shard first\n let migrations_to_complete: Vec<_> = coordinator.get_all_migrations()\n .iter()\n .filter(|(_, migration_state)| migration_state.affected_shards.contains_key(&shard))\n .map(|(mid, _)| *mid)\n .collect();\n\n // Now complete the cleanup\n for mid in migrations_to_complete {\n coordinator.complete_drain(mid).map_err(|e| e.to_string())?;\n coordinator.complete_cleanup(mid).map_err(|e| e.to_string())?;\n break; // Only need to complete one migration per shard\n }\n\n Ok(())\n }\n\n /// Start background migration for a shard.\n async fn start_background_migration_for_shard(&self, shard_id: u32) -> Result<(), String> {\n info!(\n shard_id,\n \"starting background migration\"\n );\n\n // The actual migration is handled by the Rebalancer component's migration executor\n // This method just signals that we're ready for background migration to proceed\n Ok(())\n }\n\n /// Check if migration is complete for a shard.\n async fn check_migration_complete_for_shard(&self, shard_id: u32) -> Result {\n let shard = ShardId(shard_id);\n let coordinator = self.migration_coordinator.read().await;\n\n // Check if the migration coordinator has marked this shard as complete\n for (_mid, migration_state) in coordinator.get_all_migrations() {\n if let Some(shard_state) = migration_state.affected_shards.get(&shard) {\n use crate::migration::ShardMigrationState as CoordinatorState;\n if matches!(shard_state, CoordinatorState::MigrationComplete { .. }) {\n return Ok(true);\n }\n }\n }\n\n Ok(false)\n }\n\n /// Execute background migration for a shard.\n ///\n /// This performs the actual document migration from source to target node\n /// using pagination to stay within memory bounds.\n async fn execute_background_migration(\n &self,\n executor: &Arc,\n migration_id: MigrationId,\n shard_id: u32,\n old_node_id: &MigrationNodeId,\n old_address: &str,\n new_node_id: &str,\n new_address: &str,\n index_uid: &str,\n ) -> Result<(), String> {\n info!(\n migration_id = %migration_id,\n shard_id,\n from = %old_node_id.0,\n to = %new_node_id,\n \"starting shard migration\"\n );\n\n // Paginate through all documents for this shard\n let mut offset = 0u32;\n let limit = self.config.migration_batch_size;\n let mut total_docs_copied = 0u64;\n\n loop {\n // Fetch documents from source\n let (docs, _total) = executor.fetch_documents(\n &old_node_id.0,\n old_address,\n index_uid,\n shard_id,\n limit,\n offset,\n ).await.map_err(|e| format!(\"fetch failed: {}\", e))?;\n\n if docs.is_empty() {\n break; // No more documents\n }\n\n // Write documents to target\n executor.write_documents(\n new_node_id,\n new_address,\n index_uid,\n docs.clone(),\n ).await.map_err(|e| format!(\"write failed: {}\", e))?;\n\n total_docs_copied += docs.len() as u64;\n offset += limit;\n\n // Throttle if configured\n if self.config.migration_batch_delay_ms > 0 {\n tokio::time::sleep(Duration::from_millis(\n self.config.migration_batch_delay_ms,\n ))\n .await;\n }\n }\n\n // Mark shard migration complete in coordinator\n {\n let mut coordinator = self.migration_coordinator.write().await;\n coordinator.shard_migration_complete(migration_id, ShardId(shard_id), total_docs_copied)\n .map_err(|e| format!(\"failed to mark shard complete: {}\", e))?;\n }\n\n // Update metrics\n {\n let mut metrics = self.metrics.write().await;\n metrics.record_documents_migrated(total_docs_copied);\n }\n\n // Call metrics callback for documents migrated\n if let Some(ref callback) = self.metrics_callback {\n callback(false, Some(total_docs_copied), None);\n }\n\n info!(\n migration_id = %migration_id,\n shard_id,\n docs_copied = total_docs_copied,\n \"shard migration complete\"\n );\n\n Ok(())\n }\n\n /// Pause an in-progress rebalance.\n\n /// Pause an in-progress rebalance.\n pub async fn pause_rebalance(&self, index_uid: &str) -> Result<(), String> {\n let job_id = RebalanceJobId::new(index_uid);\n let mut jobs = self.jobs.write().await;\n\n if let Some(job) = jobs.get_mut(&job_id) {\n job.paused = true;\n info!(index_uid = %index_uid, \"paused rebalance\");\n Ok(())\n } else {\n Err(format!(\"no rebalance job found for index {}\", index_uid))\n }\n }\n\n /// Resume a paused rebalance.\n pub async fn resume_rebalance(&self, index_uid: &str) -> Result<(), String> {\n let job_id = RebalanceJobId::new(index_uid);\n let mut jobs = self.jobs.write().await;\n\n if let Some(job) = jobs.get_mut(&job_id) {\n job.paused = false;\n info!(index_uid = %index_uid, \"resumed rebalance\");\n Ok(())\n } else {\n Err(format!(\"no rebalance job found for index {}\", index_uid))\n }\n }\n\n /// Load persisted jobs from task store on startup.\n pub async fn load_persisted_jobs(&self) -> Result<(), String> {\n let jobs = tokio::task::spawn_blocking({\n let task_store = self.task_store.clone();\n move || {\n task_store.list_jobs_by_state(\"running\")\n }\n })\n .await\n .map_err(|e| format!(\"failed to list jobs: {}\", e))?\n .map_err(|e| format!(\"failed to list jobs: {}\", e))?;\n\n for job_row in jobs {\n if job_row.type_ == \"rebalance\" {\n if let Ok(job) = serde_json::from_str::(&job_row.params) {\n info!(\n index_uid = %job.index_uid,\n \"loaded persisted rebalance job\"\n );\n let mut jobs = self.jobs.write().await;\n jobs.insert(job.id.clone(), job);\n }\n }\n }\n\n Ok(())\n }\n}\n\n/// Status of the rebalancer worker for monitoring.\n#[derive(Debug, Clone, Serialize, Deserialize)]\npub struct RebalancerWorkerStatus {\n /// Number of active rebalance jobs.\n pub active_jobs: usize,\n /// Number of completed rebalance jobs.\n pub completed_jobs: usize,\n /// Number of paused rebalance jobs.\n pub paused_jobs: usize,\n /// Total number of shards across all jobs.\n pub total_shards: usize,\n /// Number of completed shard migrations.\n pub completed_shards: usize,\n}\n\n/// Get current time in milliseconds since Unix epoch.\nfn now_ms() -> i64 {\n std::time::SystemTime::now()\n .duration_since(std::time::UNIX_EPOCH)\n .unwrap_or_default()\n .as_millis() as i64\n}\n\n/// Convert a topology NodeId to a migration NodeId.\nfn topo_to_migration_node_id(id: &TopologyNodeId) -> MigrationNodeId {\n crate::migration::NodeId(id.as_str().to_string())\n}\n\n/// Convert a migration NodeId to a topology NodeId.\nfn migration_to_topo_node_id(id: &MigrationNodeId) -> TopologyNodeId {\n TopologyNodeId::new(id.0.clone())\n}\n\n/// Get the old node owner for a specific shard.\nfn old_node_owners_for_shard(old_owners: &HashMap, shard_id: u32) -> MigrationNodeId {\n old_owners.get(&ShardId(shard_id))\n .cloned()\n .unwrap_or_else(|| crate::migration::NodeId(\"unknown\".to_string()))\n}\n\n#[cfg(test)]\nmod tests {\n use super::*;\n use crate::config::MiroirConfig;\n use crate::migration::MigrationConfig;\n use crate::topology::Node;\n use std::sync::Arc;\n\n fn test_topology() -> Topology {\n let mut topo = Topology::new(64, 2, 2);\n topo.add_node(Node::new(\n TopologyNodeId::new(\"node-0\".into()),\n \"http://node-0:7700\".into(),\n 0,\n ));\n topo.add_node(Node::new(\n TopologyNodeId::new(\"node-1\".into()),\n \"http://node-1:7700\".into(),\n 0,\n ));\n topo.add_node(Node::new(\n TopologyNodeId::new(\"node-2\".into()),\n \"http://node-2:7700\".into(),\n 1,\n ));\n topo.add_node(Node::new(\n TopologyNodeId::new(\"node-3\".into()),\n \"http://node-3:7700\".into(),\n 1,\n ));\n topo\n }\n\n #[test]\n fn test_rebalance_job_id() {\n let job_id = RebalanceJobId::new(\"test-index\");\n assert_eq!(job_id.0, \"rebalance:test-index\");\n assert_eq!(job_id.index_uid(), \"test-index\");\n }\n\n #[test]\n fn test_worker_config_default() {\n let config = RebalancerWorkerConfig::default();\n assert_eq!(config.max_concurrent_migrations, 4);\n assert_eq!(config.lease_ttl_secs, LEASE_TTL_SECS);\n assert_eq!(config.lease_renewal_interval_ms, LEASE_RENEWAL_INTERVAL_MS);\n }\n\n #[tokio::test]\n async fn test_compute_affected_shards_for_add() {\n let topo = Arc::new(RwLock::new(test_topology()));\n let config = RebalancerWorkerConfig::default();\n\n // Create a mock task store (in-memory for testing)\n // Note: This would need a proper mock TaskStore implementation\n // For now, we'll skip the full integration test\n\n // Test that adding a node to group 0 affects some shards\n let new_node_id = \"node-new\";\n let replica_group = 0;\n\n // We'd need to instantiate the worker with a proper mock task store\n // This is a placeholder for the actual test\n }\n\n #[test]\n fn test_shard_migration_phase_serialization() {\n let phase = ShardMigrationPhase::MigrationInProgress;\n let json = serde_json::to_string(&phase).unwrap();\n assert!(json.contains(\"MigrationInProgress\"));\n\n let deserialized: ShardMigrationPhase = serde_json::from_str(&json).unwrap();\n assert_eq!(deserialized, phase);\n }\n\n #[test]\n fn test_topology_event_serialization() {\n let event = TopologyChangeEvent::NodeAdded {\n node_id: \"node-4\".to_string(),\n replica_group: 0,\n index_uid: \"test\".to_string(),\n };\n\n let json = serde_json::to_string(&event).unwrap();\n assert!(json.contains(\"NodeAdded\"));\n\n let deserialized: TopologyChangeEvent = 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operations covering tables 1–14 from plan §4.\n13\tpub trait TaskStore: Send + Sync {\n14\t // --- Lifecycle ---\n15\t\n16\t /// Run idempotent migrations for all tables. Safe to call on every startup.\n17\t fn migrate(&self) -> Result<()>;\n18\t\n19\t // --- Table 1: tasks ---\n20\t\n21\t /// Insert a new task row.\n22\t fn insert_task(&self, task: &NewTask) -> Result<()>;\n23\t\n24\t /// Get a task by miroir_id.\n25\t fn get_task(&self, miroir_id: &str) -> Result>;\n26\t\n27\t /// Update a task's status.\n28\t fn update_task_status(&self, miroir_id: &str, status: &str) -> Result;\n29\t\n30\t /// Update a node task within a task's node_tasks JSON.\n31\t fn update_node_task(&self, miroir_id: &str, node_id: &str, task_uid: u64) -> Result;\n32\t\n33\t /// Set the error field on a task.\n34\t fn set_task_error(&self, miroir_id: &str, error: &str) -> Result;\n35\t\n36\t /// List tasks with optional status filter and pagination.\n37\t fn list_tasks(&self, filter: &TaskFilter) -> Result>;\n38\t\n39\t /// Prune terminal tasks older than `cutoff_ms` (created_at < cutoff_ms\n40\t /// AND status IN (succeeded, failed, canceled)). Returns number deleted.\n41\t /// Limited to `batch_size` rows per call.\n42\t fn prune_tasks(&self, cutoff_ms: i64, batch_size: u32) -> Result;\n43\t\n44\t /// Count total rows in the tasks table (for the miroir_task_registry_size gauge).\n45\t fn task_count(&self) -> Result;\n46\t\n47\t // --- Table 2: node_settings_version ---\n48\t\n49\t /// Upsert a settings version for (index_uid, node_id).\n50\t fn upsert_node_settings_version(\n51\t &self,\n52\t index_uid: &str,\n53\t node_id: &str,\n54\t version: i64,\n55\t updated_at: i64,\n56\t ) -> Result<()>;\n57\t\n58\t /// Get the settings version for (index_uid, node_id).\n59\t fn get_node_settings_version(\n60\t &self,\n61\t index_uid: &str,\n62\t node_id: &str,\n63\t ) -> Result>;\n64\t\n65\t // --- Table 3: aliases ---\n66\t\n67\t /// Create a new alias.\n68\t fn create_alias(&self, alias: &NewAlias) -> Result<()>;\n69\t\n70\t /// Get an alias by name.\n71\t fn get_alias(&self, name: &str) -> Result>;\n72\t\n73\t /// Flip a single alias to a new current_uid, recording history.\n74\t fn flip_alias(&self, name: &str, new_uid: &str, history_retention: usize) -> Result;\n75\t\n76\t /// Delete an alias.\n77\t fn delete_alias(&self, name: &str) -> Result;\n78\t\n79\t /// List all aliases.\n80\t fn list_aliases(&self) -> Result>;\n81\t\n82\t // --- Table 4: sessions ---\n83\t\n84\t /// Create or replace a session.\n85\t fn upsert_session(&self, session: &SessionRow) -> Result<()>;\n86\t\n87\t /// Get a session by id.\n88\t fn get_session(&self, session_id: &str) -> Result>;\n89\t\n90\t /// Delete expired sessions.\n91\t fn delete_expired_sessions(&self, now_ms: i64) -> Result;\n92\t\n93\t // --- Table 5: idempotency_cache ---\n94\t\n95\t /// Insert an idempotency cache entry.\n96\t fn insert_idempotency_entry(&self, entry: &IdempotencyEntry) -> Result<()>;\n97\t\n98\t /// Look up an idempotency entry by key.\n99\t fn get_idempotency_entry(&self, key: &str) -> Result>;\n100\t\n101\t /// Delete expired entries.\n102\t fn delete_expired_idempotency_entries(&self, now_ms: i64) -> Result;\n103\t\n104\t // --- Table 6: jobs ---\n105\t\n106\t /// Insert a new job.\n107\t fn insert_job(&self, job: &NewJob) -> Result<()>;\n108\t\n109\t /// Get a job by id.\n110\t fn get_job(&self, id: &str) -> Result>;\n111\t\n112\t /// Claim a queued job (CAS: only if still queued).\n113\t fn claim_job(&self, id: &str, claimed_by: &str, claim_expires_at: i64) -> Result;\n114\t\n115\t /// Update job state and progress.\n116\t fn update_job_progress(&self, id: &str, state: &str, progress: &str) -> Result;\n117\t\n118\t /// Renew a job claim (heartbeat).\n119\t fn renew_job_claim(&self, id: &str, claim_expires_at: i64) -> Result;\n120\t\n121\t /// List jobs by state.\n122\t fn list_jobs_by_state(&self, state: &str) -> Result>;\n123\t\n124\t // --- Table 7: leader_lease ---\n125\t\n126\t /// Try to acquire a leader lease (CAS: only if expired or held by us).\n127\t /// `now_ms` is the current time for expiry comparison.\n128\t fn try_acquire_leader_lease(\n129\t &self,\n130\t scope: &str,\n131\t holder: &str,\n132\t expires_at: i64,\n133\t now_ms: i64,\n134\t ) -> Result;\n135\t\n136\t /// Renew a leader lease we already hold.\n137\t fn renew_leader_lease(&self, scope: &str, holder: &str, expires_at: i64) -> Result;\n138\t\n139\t /// Get current lease holder for a scope.\n140\t fn get_leader_lease(&self, scope: &str) -> Result>;\n141\t\n142\t // --- Table 8: canaries ---\n143\t\n144\t /// Create or update a canary.\n145\t fn upsert_canary(&self, canary: &NewCanary) -> Result<()>;\n146\t\n147\t /// Get a canary by id.\n148\t fn get_canary(&self, id: &str) -> Result>;\n149\t\n150\t /// List all canaries.\n151\t fn list_canaries(&self) -> Result>;\n152\t\n153\t /// Delete a canary.\n154\t fn delete_canary(&self, id: &str) -> Result;\n155\t\n156\t // --- Table 9: canary_runs ---\n157\t\n158\t /// Insert a canary run (auto-prunes to run_history_per_canary).\n159\t fn insert_canary_run(&self, run: &NewCanaryRun, run_history_limit: usize) -> Result<()>;\n160\t\n161\t /// Get runs for a canary, most recent first.\n162\t fn get_canary_runs(&self, canary_id: &str, limit: usize) -> Result>;\n163\t\n164\t // --- Table 10: cdc_cursors ---\n165\t\n166\t /// Upsert a CDC cursor for (sink_name, index_uid).\n167\t fn upsert_cdc_cursor(&self, cursor: &NewCdcCursor) -> Result<()>;\n168\t\n169\t /// Get a CDC cursor by (sink_name, index_uid).\n170\t fn get_cdc_cursor(&self, sink_name: &str, index_uid: &str) -> Result>;\n171\t\n172\t /// List all CDC cursors for a sink.\n173\t fn list_cdc_cursors(&self, sink_name: &str) -> Result>;\n174\t\n175\t // --- Table 11: tenant_map ---\n176\t\n177\t /// Insert a tenant mapping.\n178\t fn insert_tenant_mapping(&self, mapping: &NewTenantMapping) -> Result<()>;\n179\t\n180\t /// Get tenant mapping by API key hash.\n181\t fn get_tenant_mapping(&self, api_key_hash: &[u8]) -> Result>;\n182\t\n183\t /// Delete a tenant mapping.\n184\t fn delete_tenant_mapping(&self, api_key_hash: &[u8]) -> Result;\n185\t\n186\t // --- Table 12: rollover_policies ---\n187\t\n188\t /// Create or update a rollover policy.\n189\t fn upsert_rollover_policy(&self, policy: &NewRolloverPolicy) -> Result<()>;\n190\t\n191\t /// Get a rollover policy by name.\n192\t fn get_rollover_policy(&self, name: &str) -> Result>;\n193\t\n194\t /// List all rollover policies.\n195\t fn list_rollover_policies(&self) -> Result>;\n196\t\n197\t /// Delete a rollover policy.\n198\t fn delete_rollover_policy(&self, name: &str) -> Result;\n199\t\n200\t // --- Table 13: search_ui_config ---\n201\t\n202\t /// Set search UI config for an index.\n203\t fn upsert_search_ui_config(&self, config: &NewSearchUiConfig) -> Result<()>;\n204\t\n205\t /// Get search UI config for an index.\n206\t fn get_search_ui_config(&self, index_uid: &str) -> Result>;\n207\t\n208\t /// Delete search UI config for an index.\n209\t fn delete_search_ui_config(&self, index_uid: &str) -> Result;\n210\t\n211\t // --- Table 14: admin_sessions ---\n212\t\n213\t /// Create an admin session.\n214\t fn insert_admin_session(&self, session: &NewAdminSession) -> Result<()>;\n215\t\n216\t /// Get an admin session by id.\n217\t fn get_admin_session(&self, session_id: &str) -> Result>;\n218\t\n219\t /// Revoke a session (logout).\n220\t fn revoke_admin_session(&self, session_id: &str) -> Result;\n221\t\n222\t /// Delete expired and revoked sessions (lazy eviction + pruner).\n223\t fn delete_expired_admin_sessions(&self, now_ms: i64) -> Result;\n224\t}\n225\t\n226\t// --- Row types ---\n227\t\n228\t/// New task to insert (table 1).\n229\t#[derive(Debug, Clone)]\n230\tpub struct NewTask {\n231\t pub miroir_id: String,\n232\t pub created_at: i64,\n233\t pub status: String,\n234\t pub node_tasks: HashMap,\n235\t pub error: Option,\n236\t pub started_at: Option,\n237\t pub finished_at: Option,\n238\t pub index_uid: Option,\n239\t pub task_type: Option,\n240\t pub node_errors: HashMap,\n241\t}\n242\t\n243\t/// Task row from the DB (table 1).\n244\t#[derive(Debug, Clone)]\n245\tpub struct TaskRow {\n246\t pub miroir_id: String,\n247\t pub created_at: i64,\n248\t pub status: String,\n249\t pub node_tasks: HashMap,\n250\t pub error: Option,\n251\t pub started_at: Option,\n252\t pub finished_at: Option,\n253\t pub index_uid: Option,\n254\t pub task_type: Option,\n255\t pub node_errors: HashMap,\n256\t}\n257\t\n258\t/// Node settings version row (table 2).\n259\t#[derive(Debug, Clone)]\n260\tpub struct NodeSettingsVersionRow {\n261\t pub index_uid: String,\n262\t pub node_id: String,\n263\t pub version: i64,\n264\t pub updated_at: i64,\n265\t}\n266\t\n267\t/// New alias to create (table 3).\n268\t#[derive(Debug, Clone)]\n269\tpub struct NewAlias {\n270\t pub name: String,\n271\t pub kind: String,\n272\t pub current_uid: Option,\n273\t pub target_uids: Option>,\n274\t pub version: i64,\n275\t pub created_at: i64,\n276\t pub history: Vec,\n277\t}\n278\t\n279\t/// Alias row from the DB (table 3).\n280\t#[derive(Debug, Clone)]\n281\tpub struct AliasRow {\n282\t pub name: String,\n283\t pub kind: String,\n284\t pub current_uid: Option,\n285\t pub target_uids: Option>,\n286\t pub version: i64,\n287\t pub created_at: i64,\n288\t pub history: Vec,\n289\t}\n290\t\n291\t/// A single entry in alias history.\n292\t#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]\n293\tpub struct AliasHistoryEntry {\n294\t pub uid: String,\n295\t pub flipped_at: i64,\n296\t}\n297\t\n298\t/// Session row (table 4).\n299\t#[derive(Debug, Clone)]\n300\tpub struct SessionRow {\n301\t pub session_id: String,\n302\t pub last_write_mtask_id: Option,\n303\t pub last_write_at: Option,\n304\t pub pinned_group: Option,\n305\t pub min_settings_version: i64,\n306\t pub ttl: i64,\n307\t}\n308\t\n309\t/// Idempotency cache entry (table 5).\n310\t#[derive(Debug, Clone)]\n311\tpub struct IdempotencyEntry {\n312\t pub key: String,\n313\t pub body_sha256: Vec,\n314\t pub miroir_task_id: String,\n315\t pub expires_at: i64,\n316\t}\n317\t\n318\t/// New job to insert (table 6).\n319\t#[derive(Debug, Clone)]\n320\tpub struct NewJob {\n321\t pub id: String,\n322\t pub type_: String,\n323\t pub params: String,\n324\t pub state: String,\n325\t pub progress: String,\n326\t}\n327\t\n328\t/// Job row from the DB (table 6).\n329\t#[derive(Debug, Clone)]\n330\tpub struct JobRow {\n331\t pub id: String,\n332\t pub type_: String,\n333\t pub params: String,\n334\t pub state: String,\n335\t pub claimed_by: Option,\n336\t pub claim_expires_at: Option,\n337\t pub progress: String,\n338\t}\n339\t\n340\t/// Leader lease row (table 7).\n341\t#[derive(Debug, Clone)]\n342\tpub struct LeaderLeaseRow {\n343\t pub scope: String,\n344\t pub holder: String,\n345\t pub expires_at: i64,\n346\t}\n347\t\n348\t/// Filter for listing tasks.\n349\t#[derive(Debug, Clone, Default)]\n350\tpub struct TaskFilter {\n351\t pub status: Option,\n352\t pub index_uid: Option,\n353\t pub task_type: Option,\n354\t pub limit: Option,\n355\t pub offset: Option,\n356\t}\n357\t\n358\t// --- Tables 8-14 row types (feature-flagged) ---\n359\t\n360\t/// Canary definition row (table 8).\n361\t#[derive(Debug, Clone)]\n362\tpub struct CanaryRow {\n363\t pub id: String,\n364\t pub name: String,\n365\t pub index_uid: String,\n366\t pub interval_s: i64,\n367\t pub query_json: String,\n368\t pub assertions_json: String,\n369\t pub enabled: bool,\n370\t pub created_at: i64,\n371\t}\n372\t\n373\t/// New or updated canary (table 8).\n374\t#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]\n375\tpub struct NewCanary {\n376\t pub id: String,\n377\t pub name: String,\n378\t pub index_uid: String,\n379\t pub interval_s: i64,\n380\t pub query_json: String,\n381\t pub assertions_json: String,\n382\t pub enabled: bool,\n383\t pub created_at: i64,\n384\t}\n385\t\n386\t/// Canary run row (table 9).\n387\t#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]\n388\tpub struct CanaryRunRow {\n389\t pub canary_id: String,\n390\t pub ran_at: i64,\n391\t pub status: String,\n392\t pub latency_ms: i64,\n393\t pub failed_assertions_json: Option,\n394\t}\n395\t\n396\t/// New canary run to insert (table 9).\n397\t#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]\n398\tpub struct NewCanaryRun {\n399\t pub canary_id: String,\n400\t pub ran_at: i64,\n401\t pub status: String,\n402\t pub latency_ms: i64,\n403\t pub failed_assertions_json: Option,\n404\t}\n405\t\n406\t/// CDC cursor row (table 10).\n407\t#[derive(Debug, Clone)]\n408\tpub struct CdcCursorRow {\n409\t pub sink_name: String,\n410\t pub index_uid: String,\n411\t pub last_event_seq: i64,\n412\t pub updated_at: i64,\n413\t}\n414\t\n415\t/// New or updated CDC cursor (table 10).\n416\t#[derive(Debug, Clone)]\n417\tpub struct NewCdcCursor {\n418\t pub sink_name: String,\n419\t pub index_uid: String,\n420\t pub last_event_seq: i64,\n421\t pub updated_at: i64,\n422\t}\n423\t\n424\t/// Tenant map row (table 11).\n425\t#[derive(Debug, Clone)]\n426\tpub struct TenantMapRow {\n427\t pub api_key_hash: Vec,\n428\t pub tenant_id: String,\n429\t pub group_id: Option,\n430\t}\n431\t\n432\t/// New tenant mapping (table 11).\n433\t#[derive(Debug, Clone)]\n434\tpub struct NewTenantMapping {\n435\t pub api_key_hash: Vec,\n436\t pub tenant_id: String,\n437\t pub group_id: Option,\n438\t}\n439\t\n440\t/// Rollover policy row (table 12).\n441\t#[derive(Debug, Clone)]\n442\tpub struct RolloverPolicyRow {\n443\t pub name: String,\n444\t pub write_alias: String,\n445\t pub read_alias: String,\n446\t pub pattern: String,\n447\t pub triggers_json: String,\n448\t pub retention_json: String,\n449\t pub template_json: String,\n450\t pub enabled: bool,\n451\t}\n452\t\n453\t/// New or updated rollover policy (table 12).\n454\t#[derive(Debug, Clone)]\n455\tpub struct NewRolloverPolicy {\n456\t pub name: String,\n457\t pub write_alias: String,\n458\t pub read_alias: String,\n459\t pub pattern: String,\n460\t pub triggers_json: String,\n461\t pub retention_json: String,\n462\t pub template_json: String,\n463\t pub enabled: bool,\n464\t}\n465\t\n466\t/// Search UI config row (table 13).\n467\t#[derive(Debug, Clone)]\n468\tpub struct SearchUiConfigRow {\n469\t pub index_uid: String,\n470\t pub config_json: String,\n471\t pub updated_at: i64,\n472\t}\n473\t\n474\t/// New or updated search UI config (table 13).\n475\t#[derive(Debug, Clone)]\n476\tpub struct NewSearchUiConfig {\n477\t pub index_uid: String,\n478\t pub config_json: String,\n479\t pub updated_at: i64,\n480\t}\n481\t\n482\t/// Admin session row (table 14).\n483\t#[derive(Debug, Clone)]\n484\tpub struct AdminSessionRow {\n485\t pub session_id: String,\n486\t pub csrf_token: String,\n487\t pub admin_key_hash: String,\n488\t pub created_at: i64,\n489\t pub expires_at: i64,\n490\t pub revoked: bool,\n491\t pub user_agent: Option,\n492\t pub source_ip: Option,\n493\t}\n494\t\n495\t/// New admin session (table 14).\n496\t#[derive(Debug, Clone)]\n497\tpub struct NewAdminSession {\n498\t pub session_id: String,\n499\t pub csrf_token: String,\n500\t pub admin_key_hash: String,\n501\t pub created_at: i64,\n502\t pub expires_at: i64,\n503\t pub user_agent: Option,\n504\t pub source_ip: Option,\n505\t}\n506\t"}]},"parent_tool_use_id":null,"session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","uuid":"35b52cb1-cebd-4ed8-997f-98280b8938ee","timestamp":"2026-05-23T05:58:17.082Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/crates/miroir-core/src/task_store/mod.rs","content":"#[cfg(feature = \"redis-store\")]\nmod redis;\nmod sqlite;\n\n#[cfg(feature = \"redis-store\")]\npub use redis::{RedisTaskStore, SearchUiScopedKey};\npub use sqlite::SqliteTaskStore;\n\nuse crate::Result;\nuse std::collections::HashMap;\n\n/// Per-table store operations covering tables 1–14 from plan §4.\npub trait TaskStore: Send + Sync {\n // --- Lifecycle ---\n\n /// Run idempotent migrations for all tables. Safe to call on every startup.\n fn migrate(&self) -> Result<()>;\n\n // --- Table 1: tasks ---\n\n /// Insert a new task row.\n fn insert_task(&self, task: &NewTask) -> Result<()>;\n\n /// Get a task by miroir_id.\n fn get_task(&self, miroir_id: &str) -> Result>;\n\n /// Update a task's status.\n fn update_task_status(&self, miroir_id: &str, status: &str) -> Result;\n\n /// Update a node task within a task's node_tasks JSON.\n fn update_node_task(&self, miroir_id: &str, node_id: &str, task_uid: u64) -> Result;\n\n /// Set the error field on a task.\n fn set_task_error(&self, miroir_id: &str, error: &str) -> Result;\n\n /// List tasks with optional status filter and pagination.\n fn list_tasks(&self, filter: &TaskFilter) -> Result>;\n\n /// Prune terminal tasks older than `cutoff_ms` (created_at < cutoff_ms\n /// AND status IN (succeeded, failed, canceled)). Returns number deleted.\n /// Limited to `batch_size` rows per call.\n fn prune_tasks(&self, cutoff_ms: i64, batch_size: u32) -> Result;\n\n /// Count total rows in the tasks table (for the miroir_task_registry_size gauge).\n fn task_count(&self) -> Result;\n\n // --- Table 2: node_settings_version ---\n\n /// Upsert a settings version for (index_uid, node_id).\n fn upsert_node_settings_version(\n &self,\n index_uid: &str,\n node_id: &str,\n version: i64,\n updated_at: i64,\n ) -> Result<()>;\n\n /// Get the settings version for (index_uid, node_id).\n fn get_node_settings_version(\n &self,\n index_uid: &str,\n node_id: &str,\n ) -> Result>;\n\n // --- Table 3: aliases ---\n\n /// Create a new alias.\n fn create_alias(&self, alias: &NewAlias) -> Result<()>;\n\n /// Get an alias by name.\n fn get_alias(&self, name: &str) -> Result>;\n\n /// Flip a single alias to a new current_uid, recording history.\n fn flip_alias(&self, name: &str, new_uid: &str, history_retention: usize) -> Result;\n\n /// Delete an alias.\n fn delete_alias(&self, name: &str) -> Result;\n\n /// List all aliases.\n fn list_aliases(&self) -> Result>;\n\n // --- Table 4: sessions ---\n\n /// Create or replace a session.\n fn upsert_session(&self, session: &SessionRow) -> Result<()>;\n\n /// Get a session by id.\n fn get_session(&self, session_id: &str) -> Result>;\n\n /// Delete expired sessions.\n fn delete_expired_sessions(&self, now_ms: i64) -> Result;\n\n // --- Table 5: idempotency_cache ---\n\n /// Insert an idempotency cache entry.\n fn insert_idempotency_entry(&self, entry: &IdempotencyEntry) -> Result<()>;\n\n /// Look up an idempotency entry by key.\n fn get_idempotency_entry(&self, key: &str) -> Result>;\n\n /// Delete expired entries.\n fn delete_expired_idempotency_entries(&self, now_ms: i64) -> Result;\n\n // --- Table 6: jobs ---\n\n /// Insert a new job.\n fn insert_job(&self, job: &NewJob) -> Result<()>;\n\n /// Get a job by id.\n fn get_job(&self, id: &str) -> Result>;\n\n /// Claim a queued job (CAS: only if still queued).\n fn claim_job(&self, id: &str, claimed_by: &str, claim_expires_at: i64) -> Result;\n\n /// Update job state and progress.\n fn update_job_progress(&self, id: &str, state: &str, progress: &str) -> Result;\n\n /// Renew a job claim (heartbeat).\n fn renew_job_claim(&self, id: &str, claim_expires_at: i64) -> Result;\n\n /// List jobs by state.\n fn list_jobs_by_state(&self, state: &str) -> Result>;\n\n // --- Table 7: leader_lease ---\n\n /// Try to acquire a leader lease (CAS: only if expired or held by us).\n /// `now_ms` is the current time for expiry comparison.\n fn try_acquire_leader_lease(\n &self,\n scope: &str,\n holder: &str,\n expires_at: i64,\n now_ms: i64,\n ) -> Result;\n\n /// Renew a leader lease we already hold.\n fn renew_leader_lease(&self, scope: &str, holder: &str, expires_at: i64) -> Result;\n\n /// Get current lease holder for a scope.\n fn get_leader_lease(&self, scope: &str) -> Result>;\n\n // --- Table 8: canaries ---\n\n /// Create or update a canary.\n fn upsert_canary(&self, canary: &NewCanary) -> Result<()>;\n\n /// Get a canary by id.\n fn get_canary(&self, id: &str) -> Result>;\n\n /// List all canaries.\n fn list_canaries(&self) -> Result>;\n\n /// Delete a canary.\n fn delete_canary(&self, id: &str) -> Result;\n\n // --- Table 9: canary_runs ---\n\n /// Insert a canary run (auto-prunes to run_history_per_canary).\n fn insert_canary_run(&self, run: &NewCanaryRun, run_history_limit: usize) -> Result<()>;\n\n /// Get runs for a canary, most recent first.\n fn get_canary_runs(&self, canary_id: &str, limit: usize) -> Result>;\n\n // --- Table 10: cdc_cursors ---\n\n /// Upsert a CDC cursor for (sink_name, index_uid).\n fn upsert_cdc_cursor(&self, cursor: &NewCdcCursor) -> Result<()>;\n\n /// Get a CDC cursor by (sink_name, index_uid).\n fn get_cdc_cursor(&self, sink_name: &str, index_uid: &str) -> Result>;\n\n /// List all CDC cursors for a sink.\n fn list_cdc_cursors(&self, sink_name: &str) -> Result>;\n\n // --- Table 11: tenant_map ---\n\n /// Insert a tenant mapping.\n fn insert_tenant_mapping(&self, mapping: &NewTenantMapping) -> Result<()>;\n\n /// Get tenant mapping by API key hash.\n fn get_tenant_mapping(&self, api_key_hash: &[u8]) -> Result>;\n\n /// Delete a tenant mapping.\n fn delete_tenant_mapping(&self, api_key_hash: &[u8]) -> Result;\n\n // --- Table 12: rollover_policies ---\n\n /// Create or update a rollover policy.\n fn upsert_rollover_policy(&self, policy: &NewRolloverPolicy) -> Result<()>;\n\n /// Get a rollover policy by name.\n fn get_rollover_policy(&self, name: &str) -> Result>;\n\n /// List all rollover policies.\n fn list_rollover_policies(&self) -> Result>;\n\n /// Delete a rollover policy.\n fn delete_rollover_policy(&self, name: &str) -> Result;\n\n // --- Table 13: search_ui_config ---\n\n /// Set search UI config for an index.\n fn upsert_search_ui_config(&self, config: &NewSearchUiConfig) -> Result<()>;\n\n /// Get search UI config for an index.\n fn get_search_ui_config(&self, index_uid: &str) -> Result>;\n\n /// Delete search UI config for an index.\n fn delete_search_ui_config(&self, index_uid: &str) -> Result;\n\n // --- Table 14: admin_sessions ---\n\n /// Create an admin session.\n fn insert_admin_session(&self, session: &NewAdminSession) -> Result<()>;\n\n /// Get an admin session by id.\n fn get_admin_session(&self, session_id: &str) -> Result>;\n\n /// Revoke a session (logout).\n fn revoke_admin_session(&self, session_id: &str) -> Result;\n\n /// Delete expired and revoked sessions (lazy eviction + pruner).\n fn delete_expired_admin_sessions(&self, now_ms: i64) -> Result;\n}\n\n// --- Row types ---\n\n/// New task to insert (table 1).\n#[derive(Debug, Clone)]\npub struct NewTask {\n pub miroir_id: String,\n pub created_at: i64,\n pub status: String,\n pub node_tasks: HashMap,\n pub error: Option,\n pub started_at: Option,\n pub finished_at: Option,\n pub index_uid: Option,\n pub task_type: Option,\n pub node_errors: HashMap,\n}\n\n/// Task row from the DB (table 1).\n#[derive(Debug, Clone)]\npub struct TaskRow {\n pub miroir_id: String,\n pub created_at: i64,\n pub status: String,\n pub node_tasks: HashMap,\n pub error: Option,\n pub started_at: Option,\n pub finished_at: Option,\n pub index_uid: Option,\n pub task_type: Option,\n pub node_errors: HashMap,\n}\n\n/// Node settings version row (table 2).\n#[derive(Debug, Clone)]\npub struct NodeSettingsVersionRow {\n pub index_uid: String,\n pub node_id: String,\n pub version: i64,\n pub updated_at: i64,\n}\n\n/// New alias to create (table 3).\n#[derive(Debug, Clone)]\npub struct NewAlias {\n pub name: String,\n pub kind: String,\n pub current_uid: Option,\n pub target_uids: Option>,\n pub version: i64,\n pub created_at: i64,\n pub history: Vec,\n}\n\n/// Alias row from the DB (table 3).\n#[derive(Debug, Clone)]\npub struct AliasRow {\n pub name: String,\n pub kind: String,\n pub current_uid: Option,\n pub target_uids: Option>,\n pub version: i64,\n pub created_at: i64,\n pub history: Vec,\n}\n\n/// A single entry in alias history.\n#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]\npub struct AliasHistoryEntry {\n pub uid: String,\n pub flipped_at: i64,\n}\n\n/// Session row (table 4).\n#[derive(Debug, Clone)]\npub struct SessionRow {\n pub session_id: String,\n pub last_write_mtask_id: Option,\n pub last_write_at: Option,\n pub pinned_group: Option,\n pub min_settings_version: i64,\n pub ttl: i64,\n}\n\n/// Idempotency cache entry (table 5).\n#[derive(Debug, Clone)]\npub struct IdempotencyEntry {\n pub key: String,\n pub body_sha256: Vec,\n pub miroir_task_id: String,\n pub expires_at: i64,\n}\n\n/// New job to insert (table 6).\n#[derive(Debug, Clone)]\npub struct NewJob {\n pub id: String,\n pub type_: String,\n pub params: String,\n pub state: String,\n pub progress: String,\n}\n\n/// Job row from the DB (table 6).\n#[derive(Debug, Clone)]\npub struct JobRow {\n pub id: String,\n pub type_: String,\n pub params: String,\n pub state: String,\n pub claimed_by: Option,\n pub claim_expires_at: Option,\n pub progress: String,\n}\n\n/// Leader lease row (table 7).\n#[derive(Debug, Clone)]\npub struct LeaderLeaseRow {\n pub scope: String,\n pub holder: String,\n pub expires_at: i64,\n}\n\n/// Filter for listing tasks.\n#[derive(Debug, Clone, Default)]\npub struct TaskFilter {\n pub status: Option,\n pub index_uid: Option,\n pub task_type: Option,\n pub limit: Option,\n pub offset: Option,\n}\n\n// --- Tables 8-14 row types (feature-flagged) ---\n\n/// Canary definition row (table 8).\n#[derive(Debug, Clone)]\npub struct CanaryRow {\n pub id: String,\n pub name: String,\n pub index_uid: String,\n pub interval_s: i64,\n pub query_json: String,\n pub assertions_json: String,\n pub enabled: bool,\n pub created_at: i64,\n}\n\n/// New or updated canary (table 8).\n#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]\npub struct NewCanary {\n pub id: String,\n pub name: String,\n pub index_uid: String,\n pub interval_s: i64,\n pub query_json: String,\n pub assertions_json: String,\n pub enabled: bool,\n pub created_at: i64,\n}\n\n/// Canary run row (table 9).\n#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]\npub struct CanaryRunRow {\n pub canary_id: String,\n pub ran_at: i64,\n pub status: String,\n pub latency_ms: i64,\n pub failed_assertions_json: Option,\n}\n\n/// New canary run to insert (table 9).\n#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]\npub struct NewCanaryRun {\n pub canary_id: String,\n pub ran_at: i64,\n pub status: String,\n pub latency_ms: i64,\n pub failed_assertions_json: Option,\n}\n\n/// CDC cursor row (table 10).\n#[derive(Debug, Clone)]\npub struct CdcCursorRow {\n pub sink_name: String,\n pub index_uid: String,\n pub last_event_seq: i64,\n pub updated_at: i64,\n}\n\n/// New or updated CDC cursor (table 10).\n#[derive(Debug, Clone)]\npub struct NewCdcCursor {\n pub sink_name: String,\n pub index_uid: String,\n pub last_event_seq: i64,\n pub updated_at: i64,\n}\n\n/// Tenant map row (table 11).\n#[derive(Debug, Clone)]\npub struct TenantMapRow {\n pub api_key_hash: Vec,\n pub tenant_id: String,\n pub group_id: Option,\n}\n\n/// New tenant mapping (table 11).\n#[derive(Debug, Clone)]\npub struct NewTenantMapping {\n pub api_key_hash: Vec,\n pub tenant_id: String,\n pub group_id: Option,\n}\n\n/// Rollover policy row (table 12).\n#[derive(Debug, Clone)]\npub struct RolloverPolicyRow {\n pub name: String,\n pub write_alias: String,\n pub read_alias: String,\n pub pattern: String,\n pub triggers_json: String,\n pub retention_json: String,\n pub template_json: String,\n pub enabled: bool,\n}\n\n/// New or updated rollover policy (table 12).\n#[derive(Debug, Clone)]\npub struct NewRolloverPolicy {\n pub name: String,\n pub write_alias: String,\n pub read_alias: String,\n pub pattern: String,\n pub triggers_json: String,\n pub retention_json: String,\n pub template_json: String,\n pub enabled: bool,\n}\n\n/// Search UI config row (table 13).\n#[derive(Debug, Clone)]\npub struct SearchUiConfigRow {\n pub index_uid: String,\n pub config_json: String,\n pub updated_at: i64,\n}\n\n/// New or updated search UI config (table 13).\n#[derive(Debug, Clone)]\npub struct NewSearchUiConfig {\n pub index_uid: String,\n pub config_json: String,\n pub updated_at: i64,\n}\n\n/// Admin session row (table 14).\n#[derive(Debug, Clone)]\npub struct AdminSessionRow {\n pub session_id: String,\n pub csrf_token: String,\n pub admin_key_hash: String,\n pub created_at: i64,\n pub expires_at: i64,\n pub revoked: bool,\n pub user_agent: Option,\n pub source_ip: Option,\n}\n\n/// New admin session (table 14).\n#[derive(Debug, Clone)]\npub struct NewAdminSession {\n pub session_id: String,\n pub csrf_token: String,\n pub admin_key_hash: String,\n pub created_at: i64,\n pub expires_at: i64,\n pub user_agent: Option,\n pub source_ip: 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Shard migration cutover state machine.\n2\t//!\n3\t//! Implements the node-addition migration flow from plan §4 with explicit state\n4\t//! transitions and a race-window-safe cutover sequence.\n5\t//!\n6\t//! ## Race window analysis (plan §15 OP#1)\n7\t//!\n8\t//! The dangerous window is between \"mark node active\" (routing changes to new-node-only)\n9\t//! and \"delete migrated shard from old node.\" A document written during dual-write that\n10\t//! succeeded on OLD but failed on NEW — and arrived after the last migration page —\n11\t//! would be deleted from OLD without ever reaching NEW.\n12\t//!\n13\t//! ## Solution: quiesce-then-verify cutover\n14\t//!\n15\t//! Instead of the naïve sequence (mark active → stop dual-write → delete old), we use:\n16\t//!\n17\t//! 1. Stop dual-write (no new writes go to either node for affected shards)\n18\t//! 2. Drain: wait for all in-flight writes to both OLD and NEW to complete\n19\t//! 3. Delta migration: re-read affected shards from OLD (catches anything written since\n20\t//! the last migration page) and write deltas to NEW\n21\t//! 4. Mark node active (routing switches to NEW-only)\n22\t//! 5. Delete migrated shard from OLD\n23\t//!\n24\t//! Step 3 is the key: it closes the race window by ensuring NEW has a complete picture\n25\t//! before we commit the routing change. The cost is one extra pagination pass over each\n26\t//! migrated shard — bounded by the number of docs written during the migration window.\n27\t\n28\tuse std::collections::{HashMap, HashSet};\n29\tuse std::fmt;\n30\tuse std::time::{Duration, Instant};\n31\t\n32\tuse serde::{Deserialize, Serialize};\n33\t\n34\t/// Unique identifier for a shard migration operation.\n35\t#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]\n36\tpub struct MigrationId(pub u64);\n37\t\n38\timpl fmt::Display for MigrationId {\n39\t fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {\n40\t write!(f, \"{}\", self.0)\n41\t }\n42\t}\n43\t\n44\t/// Identifier for a physical node in the cluster.\n45\t#[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]\n46\tpub struct NodeId(pub String);\n47\t\n48\t// Type alias for external use (rebalancer, etc.)\n49\tpub type MigrationNodeId = NodeId;\n50\t\n51\timpl fmt::Display for NodeId {\n52\t fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {\n53\t write!(f, \"{}\", self.0)\n54\t }\n55\t}\n56\t\n57\t/// Identifier for a logical shard.\n58\t#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]\n59\tpub struct ShardId(pub u32);\n60\t\n61\timpl fmt::Display for ShardId {\n62\t fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {\n63\t write!(f, \"s{}\", self.0)\n64\t }\n65\t}\n66\t\n67\t/// Per-shard migration state within a node-addition migration.\n68\t#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]\n69\tpub enum ShardMigrationState {\n70\t /// Waiting for background migration to begin.\n71\t Pending,\n72\t /// Background pagination is reading docs from source and writing to target.\n73\t Migrating {\n74\t docs_copied: u64,\n75\t pages_remaining: u32,\n76\t },\n77\t /// Background migration complete, awaiting cutover.\n78\t MigrationComplete { docs_copied: u64 },\n79\t /// Dual-write stopped, in-flight writes draining.\n80\t Draining {\n81\t in_flight_count: u32,\n82\t docs_copied: u64,\n83\t },\n84\t /// Delta pass: re-reading source to catch stragglers written during migration.\n85\t DeltaPass {\n86\t docs_copied: u64,\n87\t delta_docs_copied: u64,\n88\t },\n89\t /// Node is active for this shard; old replica data deleted.\n90\t Active,\n91\t /// Migration failed at this phase.\n92\t Failed { phase: String, reason: String },\n93\t}\n94\t\n95\timpl fmt::Display for ShardMigrationState {\n96\t fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {\n97\t match self {\n98\t Self::Pending => write!(f, \"pending\"),\n99\t Self::Migrating {\n100\t docs_copied,\n101\t pages_remaining,\n102\t } => {\n103\t write!(\n104\t f,\n105\t \"migrating({docs_copied} copied, {pages_remaining} pages left)\"\n106\t )\n107\t }\n108\t Self::MigrationComplete { docs_copied } => {\n109\t write!(f, \"migration_complete({docs_copied} copied)\")\n110\t }\n111\t Self::Draining {\n112\t in_flight_count,\n113\t docs_copied,\n114\t } => {\n115\t write!(\n116\t f,\n117\t \"draining({in_flight_count} in-flight, {docs_copied} copied)\"\n118\t )\n119\t }\n120\t Self::DeltaPass {\n121\t docs_copied,\n122\t delta_docs_copied,\n123\t } => {\n124\t write!(f, \"delta_pass({docs_copied} + {delta_docs_copied} copied)\")\n125\t }\n126\t Self::Active => write!(f, \"active\"),\n127\t Self::Failed { phase, reason } => write!(f, \"failed({phase}: {reason})\"),\n128\t }\n129\t }\n130\t}\n131\t\n132\t/// Overall migration phase for a node addition.\n133\t#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]\n134\tpub enum MigrationPhase {\n135\t /// Computing which shards move to the new node.\n136\t ComputingAssignments,\n137\t /// Dual-write active; background migration in progress.\n138\t DualWriteMigrating,\n139\t /// Background migration done; beginning cutover.\n140\t CutoverBegin,\n141\t /// Stopping dual-write; waiting for in-flight writes to settle.\n142\t CutoverDraining,\n143\t /// Re-reading source to catch docs written during migration.\n144\t CutoverDeltaPass,\n145\t /// Marking new node active; switching routing.\n146\t CutoverActivate,\n147\t /// Deleting migrated shard data from old nodes.\n148\t CutoverCleanup,\n149\t /// All shards migrated; migration complete.\n150\t Complete,\n151\t /// Migration failed.\n152\t Failed(String),\n153\t}\n154\t\n155\timpl fmt::Display for MigrationPhase {\n156\t fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {\n157\t match self {\n158\t Self::ComputingAssignments => write!(f, \"computing_assignments\"),\n159\t Self::DualWriteMigrating => write!(f, \"dual_write_migrating\"),\n160\t Self::CutoverBegin => write!(f, \"cutover_begin\"),\n161\t Self::CutoverDraining => write!(f, \"cutover_draining\"),\n162\t Self::CutoverDeltaPass => write!(f, \"cutover_delta_pass\"),\n163\t Self::CutoverActivate => write!(f, \"cutover_activate\"),\n164\t Self::CutoverCleanup => write!(f, \"cutover_cleanup\"),\n165\t Self::Complete => write!(f, \"complete\"),\n166\t Self::Failed(msg) => write!(f, \"failed({msg})\"),\n167\t }\n168\t }\n169\t}\n170\t\n171\t/// A single document write targeting a shard during migration.\n172\t#[derive(Debug, Clone)]\n173\tpub struct InFlightWrite {\n174\t pub doc_id: String,\n175\t pub shard: ShardId,\n176\t pub target_nodes: Vec,\n177\t pub completed_nodes: HashSet,\n178\t pub failed_nodes: HashMap,\n179\t pub submitted_at: Instant,\n180\t}\n181\t\n182\t// Serialize Instant as a placeholder bool (present/absent).\n183\t// Instant is monotonic and not meaningfully serializable across processes;\n184\t// on deserialize, reconstruct as Instant::now().\n185\tmod instant_serde {\n186\t use serde::{Deserialize, Deserializer, Serialize, Serializer};\n187\t use std::time::Instant;\n188\t\n189\t pub fn serialize(instant: &Option, serializer: S) -> Result\n190\t where\n191\t S: Serializer,\n192\t {\n193\t instant.is_some().serialize(serializer)\n194\t }\n195\t\n196\t pub fn deserialize<'de, D>(deserializer: D) -> Result, D::Error>\n197\t where\n198\t D: Deserializer<'de>,\n199\t {\n200\t let present = bool::deserialize(deserializer)?;\n201\t Ok(if present { Some(Instant::now()) } else { None })\n202\t }\n203\t}\n204\t\n205\t/// Configuration for migration cutover behavior.\n206\t#[derive(Debug, Clone, Serialize, Deserialize)]\n207\tpub struct MigrationConfig {\n208\t /// Maximum time to wait for in-flight writes to drain during cutover.\n209\t pub drain_timeout: Duration,\n210\t /// Whether to perform the delta pass (re-read source after stopping dual-write).\n211\t /// Disabling this saves a pagination pass but opens the race window — only safe\n212\t /// when anti-entropy is enabled as a safety net.\n213\t pub skip_delta_pass: bool,\n214\t /// Whether anti-entropy is enabled — used to determine if skip_delta_pass is safe.\n215\t pub anti_entropy_enabled: bool,\n216\t}\n217\t\n218\timpl Default for MigrationConfig {\n219\t fn default() -> Self {\n220\t Self {\n221\t drain_timeout: Duration::from_secs(30),\n222\t skip_delta_pass: false,\n223\t anti_entropy_enabled: true,\n224\t }\n225\t }\n226\t}\n227\t\n228\t/// Error type for migration operations.\n229\t#[derive(Debug, thiserror::Error)]\n230\tpub enum MigrationError {\n231\t #[error(\n232\t \"anti-entropy is disabled and delta pass is skipped — documents may be lost at cutover\"\n233\t )]\n234\t UnsafeCutoverNoAntiEntropy,\n235\t #[error(\"drain timeout exceeded: {0} in-flight writes still pending\")]\n236\t DrainTimeout(u32),\n237\t #[error(\"shard {0} is not in a valid state for this transition (current: {1})\")]\n238\t InvalidTransition(ShardId, String),\n239\t #[error(\"migration {0} not found\")]\n240\t NotFound(MigrationId),\n241\t #[error(\"delta pass failed for shard {0}: {1}\")]\n242\t DeltaPassFailed(ShardId, String),\n243\t}\n244\t\n245\t/// Tracks the state of a node-addition migration.\n246\t#[derive(Debug, Clone, Serialize, Deserialize)]\n247\tpub struct MigrationState {\n248\t pub id: MigrationId,\n249\t pub new_node: NodeId,\n250\t pub replica_group: u32,\n251\t pub phase: MigrationPhase,\n252\t pub affected_shards: HashMap,\n253\t /// Maps shard → old node that currently owns it.\n254\t pub old_owners: HashMap,\n255\t #[serde(with = \"instant_serde\")]\n256\t pub started_at: Option,\n257\t #[serde(with = \"instant_serde\")]\n258\t pub completed_at: Option,\n259\t}\n260\t\n261\t/// The migration coordinator manages shard migration state transitions.\n262\tpub struct MigrationCoordinator {\n263\t config: MigrationConfig,\n264\t migrations: HashMap,\n265\t next_id: u64,\n266\t /// In-flight writes being tracked for drain during cutover.\n267\t in_flight: Vec,\n268\t}\n269\t\n270\timpl MigrationCoordinator {\n271\t pub fn new(config: MigrationConfig) -> Self {\n272\t Self {\n273\t config,\n274\t migrations: HashMap::new(),\n275\t next_id: 0,\n276\t in_flight: Vec::new(),\n277\t }\n278\t }\n279\t\n280\t /// Validate migration safety before starting. Returns an error if the configuration\n281\t /// would allow data loss at the cutover boundary.\n282\t pub fn validate_safety(&self) -> Result<(), MigrationError> {\n283\t if self.config.skip_delta_pass && !self.config.anti_entropy_enabled {\n284\t return Err(MigrationError::UnsafeCutoverNoAntiEntropy);\n285\t }\n286\t Ok(())\n287\t }\n288\t\n289\t /// Begin a new node-addition migration.\n290\t pub fn begin_migration(\n291\t &mut self,\n292\t new_node: NodeId,\n293\t replica_group: u32,\n294\t affected_shards: HashMap,\n295\t ) -> Result {\n296\t self.validate_safety()?;\n297\t\n298\t let id = MigrationId(self.next_id);\n299\t self.next_id += 1;\n300\t\n301\t let shard_states: HashMap = affected_shards\n302\t .keys()\n303\t .map(|&shard| (shard, ShardMigrationState::Pending))\n304\t .collect();\n305\t\n306\t let state = MigrationState {\n307\t id,\n308\t new_node,\n309\t replica_group,\n310\t phase: MigrationPhase::ComputingAssignments,\n311\t affected_shards: shard_states,\n312\t old_owners: affected_shards,\n313\t started_at: Some(Instant::now()),\n314\t completed_at: None,\n315\t };\n316\t\n317\t self.migrations.insert(id, state);\n318\t Ok(id)\n319\t }\n320\t\n321\t /// Transition to dual-write + background migration phase.\n322\t pub fn begin_dual_write(&mut self, id: MigrationId) -> Result<(), MigrationError> {\n323\t let state = self\n324\t .migrations\n325\t .get_mut(&id)\n326\t .ok_or(MigrationError::NotFound(id))?;\n327\t state.phase = MigrationPhase::DualWriteMigrating;\n328\t for shard_state in state.affected_shards.values_mut() {\n329\t if *shard_state == ShardMigrationState::Pending {\n330\t *shard_state = ShardMigrationState::Migrating {\n331\t docs_copied: 0,\n332\t pages_remaining: 0,\n333\t };\n334\t }\n335\t }\n336\t Ok(())\n337\t }\n338\t\n339\t /// Record that a shard's background migration completed.\n340\t pub fn shard_migration_complete(\n341\t &mut self,\n342\t id: MigrationId,\n343\t shard: ShardId,\n344\t docs_copied: u64,\n345\t ) -> Result<(), MigrationError> {\n346\t let state = self\n347\t .migrations\n348\t .get_mut(&id)\n349\t .ok_or(MigrationError::NotFound(id))?;\n350\t let shard_state = state.affected_shards.get_mut(&shard).ok_or_else(|| {\n351\t MigrationError::InvalidTransition(shard, \"shard not in migration\".into())\n352\t })?;\n353\t\n354\t match shard_state {\n355\t ShardMigrationState::Migrating { .. } => {\n356\t *shard_state = ShardMigrationState::MigrationComplete { docs_copied };\n357\t }\n358\t _ => {\n359\t return Err(MigrationError::InvalidTransition(\n360\t shard,\n361\t shard_state.to_string(),\n362\t ));\n363\t }\n364\t }\n365\t\n366\t // Check if all shards are done migrating\n367\t let all_complete = state\n368\t .affected_shards\n369\t .values()\n370\t .all(|s| matches!(s, ShardMigrationState::MigrationComplete { .. }));\n371\t\n372\t if all_complete {\n373\t state.phase = MigrationPhase::CutoverBegin;\n374\t }\n375\t\n376\t Ok(())\n377\t }\n378\t\n379\t /// Begin the cutover sequence: stop dual-write and drain in-flight writes.\n380\t pub fn begin_cutover(&mut self, id: MigrationId) -> Result {\n381\t let state = self\n382\t .migrations\n383\t .get_mut(&id)\n384\t .ok_or(MigrationError::NotFound(id))?;\n385\t\n386\t if !matches!(state.phase, MigrationPhase::CutoverBegin) {\n387\t return Err(MigrationError::InvalidTransition(\n388\t ShardId(0),\n389\t format!(\"expected CutoverBegin, got {}\", state.phase),\n390\t ));\n391\t }\n392\t\n393\t // Transition all shards to Draining\n394\t let total_in_flight = self.in_flight.len() as u32;\n395\t for (shard, shard_state) in state.affected_shards.iter_mut() {\n396\t match shard_state {\n397\t ShardMigrationState::MigrationComplete { docs_copied } => {\n398\t *shard_state = ShardMigrationState::Draining {\n399\t in_flight_count: total_in_flight,\n400\t docs_copied: *docs_copied,\n401\t };\n402\t }\n403\t _ => {\n404\t return Err(MigrationError::InvalidTransition(\n405\t *shard,\n406\t shard_state.to_string(),\n407\t ));\n408\t }\n409\t }\n410\t }\n411\t\n412\t state.phase = MigrationPhase::CutoverDraining;\n413\t Ok(state.phase.clone())\n414\t }\n415\t\n416\t /// Register an in-flight write for tracking during drain.\n417\t pub fn register_in_flight(&mut self, write: InFlightWrite) {\n418\t self.in_flight.push(write);\n419\t }\n420\t\n421\t /// Acknowledge completion of a write to a specific node.\n422\t pub fn ack_write(&mut self, doc_id: &str, node: &NodeId) {\n423\t for write in &mut self.in_flight {\n424\t if write.doc_id == doc_id {\n425\t write.completed_nodes.insert(node.clone());\n426\t }\n427\t }\n428\t }\n429\t\n430\t /// Mark a write as failed on a specific node.\n431\t pub fn fail_write(&mut self, doc_id: &str, node: &NodeId, reason: String) {\n432\t for write in &mut self.in_flight {\n433\t if write.doc_id == doc_id {\n434\t write.failed_nodes.insert(node.clone(), reason.clone());\n435\t }\n436\t }\n437\t }\n438\t\n439\t /// Check if all in-flight writes have completed (drained).\n440\t pub fn is_drained(&self) -> bool {\n441\t self.in_flight\n442\t .iter()\n443\t .all(|w| w.completed_nodes.len() + w.failed_nodes.len() == w.target_nodes.len())\n444\t }\n445\t\n446\t /// Complete the drain and move to delta pass or activation.\n447\t pub fn complete_drain(&mut self, id: MigrationId) -> Result {\n448\t // First check phase exists without holding mutable borrow\n449\t let phase = self\n450\t .migrations\n451\t .get(&id)\n452\t .ok_or(MigrationError::NotFound(id))?\n453\t .phase\n454\t .clone();\n455\t\n456\t if !matches!(phase, MigrationPhase::CutoverDraining) {\n457\t return Err(MigrationError::InvalidTransition(\n458\t ShardId(0),\n459\t format!(\"expected CutoverDraining, got {}\", phase),\n460\t ));\n461\t }\n462\t\n463\t // Check drain status\n464\t if !self.is_drained() {\n465\t let remaining = self\n466\t .in_flight\n467\t .iter()\n468\t .filter(|w| w.completed_nodes.len() + w.failed_nodes.len() < w.target_nodes.len())\n469\t .count() as u32;\n470\t return Err(MigrationError::DrainTimeout(remaining));\n471\t }\n472\t\n473\t // Collect docs that need delta pass\n474\t let needs_delta = self.collect_delta_candidates(id)?;\n475\t let skip_delta = self.config.skip_delta_pass;\n476\t\n477\t // Now get mutable borrow to update state\n478\t let state = self\n479\t .migrations\n480\t .get_mut(&id)\n481\t .ok_or(MigrationError::NotFound(id))?;\n482\t\n483\t if skip_delta {\n484\t // Skip delta pass — safe only if anti-entropy is enabled\n485\t state.phase = MigrationPhase::CutoverActivate;\n486\t } else if needs_delta.is_empty() {\n487\t state.phase = MigrationPhase::CutoverActivate;\n488\t } else {\n489\t state.phase = MigrationPhase::CutoverDeltaPass;\n490\t for (_shard, shard_state) in state.affected_shards.iter_mut() {\n491\t if let ShardMigrationState::Draining { docs_copied, .. } = shard_state {\n492\t *shard_state = ShardMigrationState::DeltaPass {\n493\t docs_copied: *docs_copied,\n494\t delta_docs_copied: 0,\n495\t };\n496\t }\n497\t }\n498\t }\n499\t\n500\t self.in_flight.clear();\n501\t\n502\t // If going to activate, do that now (drop mutable borrow first)\n503\t let next_phase = state.phase.clone();\n504\t if matches!(next_phase, MigrationPhase::CutoverActivate) {\n505\t let _ = state;\n506\t self.activate_shards(id)?;\n507\t // Return the new phase after activation\n508\t return Ok(self\n509\t .migrations\n510\t .get(&id)\n511\t .map(|s| s.phase.clone())\n512\t .unwrap_or(MigrationPhase::CutoverCleanup));\n513\t }\n514\t\n515\t Ok(next_phase)\n516\t }\n517\t\n518\t /// Identify writes that need the delta pass — those that succeeded on OLD but\n519\t /// failed (or never reached) NEW.\n520\t fn collect_delta_candidates(\n521\t &self,\n522\t id: MigrationId,\n523\t ) -> Result>, MigrationError> {\n524\t let state = self\n525\t .migrations\n526\t .get(&id)\n527\t .ok_or(MigrationError::NotFound(id))?;\n528\t let mut candidates: HashMap> = HashMap::new();\n529\t\n530\t for write in &self.in_flight {\n531\t let old_owner = match state.old_owners.get(&write.shard) {\n532\t Some(owner) => owner,\n533\t None => continue,\n534\t };\n535\t\n536\t let succeeded_on_old = write.completed_nodes.contains(old_owner);\n537\t let succeeded_on_new = write.completed_nodes.contains(&state.new_node);\n538\t\n539\t // Doc is on OLD but not on NEW — delta pass must catch it\n540\t if succeeded_on_old && !succeeded_on_new {\n541\t candidates\n542\t .entry(write.shard)\n543\t .or_default()\n544\t .push(write.doc_id.clone());\n545\t }\n546\t }\n547\t\n548\t Ok(candidates)\n549\t }\n550\t\n551\t /// Record that the delta pass completed for a shard.\n552\t pub fn shard_delta_complete(\n553\t &mut self,\n554\t id: MigrationId,\n555\t shard: ShardId,\n556\t delta_docs: u64,\n557\t ) -> Result<(), MigrationError> {\n558\t let state = self\n559\t .migrations\n560\t .get_mut(&id)\n561\t .ok_or(MigrationError::NotFound(id))?;\n562\t let shard_state = state.affected_shards.get_mut(&shard).ok_or_else(|| {\n563\t MigrationError::InvalidTransition(shard, \"shard not in migration\".into())\n564\t })?;\n565\t\n566\t match shard_state {\n567\t ShardMigrationState::DeltaPass { docs_copied, .. } => {\n568\t *shard_state = ShardMigrationState::MigrationComplete {\n569\t docs_copied: *docs_copied + delta_docs,\n570\t };\n571\t }\n572\t _ => {\n573\t return Err(MigrationError::InvalidTransition(\n574\t shard,\n575\t shard_state.to_string(),\n576\t ));\n577\t }\n578\t }\n579\t\n580\t // Check if all shards done with delta\n581\t let all_complete = state\n582\t .affected_shards\n583\t .values()\n584\t .all(|s| matches!(s, ShardMigrationState::MigrationComplete { .. }));\n585\t\n586\t if all_complete {\n587\t state.phase = MigrationPhase::CutoverActivate;\n588\t self.activate_shards(id)?;\n589\t }\n590\t\n591\t Ok(())\n592\t }\n593\t\n594\t /// Mark all affected shards as active on the new node.\n595\t fn activate_shards(&mut self, id: MigrationId) -> Result<(), MigrationError> {\n596\t let state = self\n597\t .migrations\n598\t .get_mut(&id)\n599\t .ok_or(MigrationError::NotFound(id))?;\n600\t\n601\t for shard_state in state.affected_shards.values_mut() {\n602\t match shard_state {\n603\t ShardMigrationState::MigrationComplete { .. }\n604\t | ShardMigrationState::Draining { .. } => {\n605\t *shard_state = ShardMigrationState::Active;\n606\t }\n607\t _ => {}\n608\t }\n609\t }\n610\t\n611\t if matches!(state.phase, MigrationPhase::CutoverActivate) {\n612\t state.phase = MigrationPhase::CutoverCleanup;\n613\t }\n614\t\n615\t Ok(())\n616\t }\n617\t\n618\t /// Complete the migration by deleting migrated shard data from old nodes.\n619\t pub fn complete_cleanup(&mut self, id: MigrationId) -> Result<(), MigrationError> {\n620\t let state = self\n621\t .migrations\n622\t .get_mut(&id)\n623\t .ok_or(MigrationError::NotFound(id))?;\n624\t\n625\t if !matches!(state.phase, MigrationPhase::CutoverCleanup) {\n626\t return Err(MigrationError::InvalidTransition(\n627\t ShardId(0),\n628\t format!(\"expected CutoverCleanup, got {}\", state.phase),\n629\t ));\n630\t }\n631\t\n632\t state.phase = MigrationPhase::Complete;\n633\t state.completed_at = Some(Instant::now());\n634\t Ok(())\n635\t }\n636\t\n637\t /// Get the current state of a migration.\n638\t pub fn get_state(&self, id: MigrationId) -> Option<&MigrationState> {\n639\t self.migrations.get(&id)\n640\t }\n641\t\n642\t /// Check if a write should go to both old and new node (dual-write phase).\n643\t pub fn is_dual_write_active(&self, shard: ShardId) -> bool {\n644\t self.migrations.values().any(|m| {\n645\t matches!(m.phase, MigrationPhase::DualWriteMigrating)\n646\t && matches!(\n647\t m.affected_shards.get(&shard),\n648\t Some(ShardMigrationState::Migrating { .. })\n649\t )\n650\t })\n651\t }\n652\t\n653\t /// Get all migration states for inspection (e.g., by router for dual-write).\n654\t pub fn get_all_migrations(&self) -> &HashMap {\n655\t &self.migrations\n656\t }\n657\t\n658\t /// Get the migration config.\n659\t pub fn config(&self) -> &MigrationConfig {\n660\t &self.config\n661\t }\n662\t}\n663\t\n664\t#[cfg(test)]\n665\tmod tests {\n666\t use super::*;\n667\t\n668\t fn node(s: &str) -> NodeId {\n669\t NodeId(s.to_string())\n670\t }\n671\t\n672\t fn shard(id: u32) -> ShardId {\n673\t ShardId(id)\n674\t }\n675\t\n676\t #[test]\n677\t fn test_safe_cutover_with_delta_pass() {\n678\t let config = MigrationConfig {\n679\t anti_entropy_enabled: false,\n680\t skip_delta_pass: false,\n681\t ..Default::default()\n682\t };\n683\t let mut coord = MigrationCoordinator::new(config);\n684\t\n685\t let affected = HashMap::from([(shard(0), node(\"old-0\")), (shard(1), node(\"old-0\"))]);\n686\t\n687\t let mid = coord.begin_migration(node(\"new-0\"), 0, affected).unwrap();\n688\t coord.begin_dual_write(mid).unwrap();\n689\t\n690\t // Simulate background migration completing\n691\t coord.shard_migration_complete(mid, shard(0), 500).unwrap();\n692\t coord.shard_migration_complete(mid, shard(1), 300).unwrap();\n693\t\n694\t // Register an in-flight write that succeeded on OLD but not NEW.\n695\t // The write must be marked as failed on NEW so is_drained() sees\n696\t // completed + failed == target count.\n697\t coord.register_in_flight(InFlightWrite {\n698\t doc_id: \"doc-at-boundary\".into(),\n699\t shard: shard(0),\n700\t target_nodes: vec![node(\"old-0\"), node(\"new-0\")],\n701\t completed_nodes: HashSet::from([node(\"old-0\")]),\n702\t failed_nodes: HashMap::from([(node(\"new-0\"), \"write failed\".into())]),\n703\t submitted_at: Instant::now(),\n704\t });\n705\t\n706\t // Cutover\n707\t coord.begin_cutover(mid).unwrap();\n708\t\n709\t // The drain sees the in-flight write completed (on old, not on new)\n710\t // Delta pass should be triggered\n711\t let phase = coord.complete_drain(mid).unwrap();\n712\t assert_eq!(phase, MigrationPhase::CutoverDeltaPass);\n713\t\n714\t // Delta pass catches the straggler\n715\t coord.shard_delta_complete(mid, shard(0), 1).unwrap();\n716\t // Shard 1 had no stragglers, but needs delta complete too\n717\t coord.shard_delta_complete(mid, shard(1), 0).unwrap();\n718\t\n719\t // Now activation and cleanup\n720\t let state = coord.get_state(mid).unwrap();\n721\t assert_eq!(state.phase, MigrationPhase::CutoverCleanup);\n722\t\n723\t coord.complete_cleanup(mid).unwrap();\n724\t let state = coord.get_state(mid).unwrap();\n725\t assert_eq!(state.phase, MigrationPhase::Complete);\n726\t }\n727\t\n728\t #[test]\n729\t fn test_unsafe_cutover_refused_without_anti_entropy() {\n730\t let config = MigrationConfig {\n731\t anti_entropy_enabled: false,\n732\t skip_delta_pass: true,\n733\t ..Default::default()\n734\t };\n735\t let mut coord = MigrationCoordinator::new(config);\n736\t\n737\t let affected = HashMap::from([(shard(0), node(\"old-0\"))]);\n738\t let result = coord.begin_migration(node(\"new-0\"), 0, affected);\n739\t\n740\t assert!(result.is_err());\n741\t let err = result.unwrap_err();\n742\t assert!(matches!(err, MigrationError::UnsafeCutoverNoAntiEntropy));\n743\t }\n744\t\n745\t #[test]\n746\t fn test_skip_delta_pass_allowed_with_anti_entropy() {\n747\t let config = MigrationConfig {\n748\t anti_entropy_enabled: true,\n749\t skip_delta_pass: true,\n750\t ..Default::default()\n751\t };\n752\t let mut coord = MigrationCoordinator::new(config);\n753\t\n754\t let affected = HashMap::from([(shard(0), node(\"old-0\"))]);\n755\t let mid = coord.begin_migration(node(\"new-0\"), 0, affected).unwrap();\n756\t coord.begin_dual_write(mid).unwrap();\n757\t coord.shard_migration_complete(mid, shard(0), 100).unwrap();\n758\t\n759\t coord.begin_cutover(mid).unwrap();\n760\t\n761\t // With skip_delta_pass=true and AE enabled, drain goes straight to activate\n762\t let phase = coord.complete_drain(mid).unwrap();\n763\t assert_eq!(phase, MigrationPhase::CutoverCleanup);\n764\t\n765\t coord.complete_cleanup(mid).unwrap();\n766\t assert_eq!(\n767\t coord.get_state(mid).unwrap().phase,\n768\t MigrationPhase::Complete\n769\t );\n770\t }\n771\t\n772\t #[test]\n773\t fn test_drain_timeout_blocks_cutover() {\n774\t let config = MigrationConfig {\n775\t anti_entropy_enabled: true,\n776\t skip_delta_pass: true,\n777\t ..Default::default()\n778\t };\n779\t let mut coord = MigrationCoordinator::new(config);\n780\t\n781\t let affected = HashMap::from([(shard(0), node(\"old-0\"))]);\n782\t let mid = coord.begin_migration(node(\"new-0\"), 0, affected).unwrap();\n783\t coord.begin_dual_write(mid).unwrap();\n784\t coord.shard_migration_complete(mid, shard(0), 100).unwrap();\n785\t coord.begin_cutover(mid).unwrap();\n786\t\n787\t // Register an in-flight write that hasn't completed on either node\n788\t coord.register_in_flight(InFlightWrite {\n789\t doc_id: \"stuck-doc\".into(),\n790\t shard: shard(0),\n791\t target_nodes: vec![node(\"old-0\"), node(\"new-0\")],\n792\t completed_nodes: HashSet::new(),\n793\t failed_nodes: HashMap::new(),\n794\t submitted_at: Instant::now(),\n795\t });\n796\t\n797\t // Drain should fail — write still in flight\n798\t let result = coord.complete_drain(mid);\n799\t assert!(result.is_err());\n800\t assert!(matches!(\n801\t result.unwrap_err(),\n802\t MigrationError::DrainTimeout(1)\n803\t ));\n804\t }\n805\t\n806\t #[test]\n807\t fn test_display_impls() {\n808\t assert_eq!(format!(\"{}\", MigrationId(42)), \"42\");\n809\t assert_eq!(format!(\"{}\", NodeId(\"n1\".into())), \"n1\");\n810\t assert_eq!(format!(\"{}\", ShardId(7)), \"s7\");\n811\t assert_eq!(format!(\"{}\", ShardMigrationState::Pending), \"pending\");\n812\t assert_eq!(\n813\t format!(\"{}\", ShardMigrationState::Migrating { docs_copied: 100, pages_remaining: 3 }),\n814\t \"migrating(100 copied, 3 pages left)\"\n815\t );\n816\t assert_eq!(\n817\t format!(\"{}\", ShardMigrationState::MigrationComplete { docs_copied: 500 }),\n818\t \"migration_complete(500 copied)\"\n819\t );\n820\t assert_eq!(\n821\t format!(\"{}\", ShardMigrationState::Draining { in_flight_count: 2, docs_copied: 500 }),\n822\t \"draining(2 in-flight, 500 copied)\"\n823\t );\n824\t assert_eq!(\n825\t format!(\"{}\", ShardMigrationState::DeltaPass { docs_copied: 500, delta_docs_copied: 3 }),\n826\t \"delta_pass(500 + 3 copied)\"\n827\t );\n828\t assert_eq!(format!(\"{}\", ShardMigrationState::Active), \"active\");\n829\t assert_eq!(\n830\t format!(\"{}\", ShardMigrationState::Failed { phase: \"cutover\".into(), reason: \"oops\".into() }),\n831\t \"failed(cutover: oops)\"\n832\t );\n833\t\n834\t assert_eq!(format!(\"{}\", MigrationPhase::ComputingAssignments), \"computing_assignments\");\n835\t assert_eq!(format!(\"{}\", MigrationPhase::DualWriteMigrating), \"dual_write_migrating\");\n836\t assert_eq!(format!(\"{}\", MigrationPhase::CutoverBegin), \"cutover_begin\");\n837\t assert_eq!(format!(\"{}\", MigrationPhase::CutoverDraining), \"cutover_draining\");\n838\t assert_eq!(format!(\"{}\", MigrationPhase::CutoverDeltaPass), \"cutover_delta_pass\");\n839\t assert_eq!(format!(\"{}\", MigrationPhase::CutoverActivate), \"cutover_activate\");\n840\t assert_eq!(format!(\"{}\", MigrationPhase::CutoverCleanup), \"cutover_cleanup\");\n841\t assert_eq!(format!(\"{}\", MigrationPhase::Complete), \"complete\");\n842\t assert_eq!(format!(\"{}\", MigrationPhase::Failed(\"err\".into())), \"failed(err)\");\n843\t }\n844\t\n845\t #[test]\n846\t fn test_ack_and_fail_write_tracking() {\n847\t let config = MigrationConfig::default();\n848\t let mut coord = MigrationCoordinator::new(config);\n849\t\n850\t let affected = HashMap::from([(shard(0), node(\"old-0\"))]);\n851\t let mid = coord.begin_migration(node(\"new-0\"), 0, affected).unwrap();\n852\t coord.begin_dual_write(mid).unwrap();\n853\t coord.shard_migration_complete(mid, shard(0), 100).unwrap();\n854\t\n855\t coord.register_in_flight(InFlightWrite {\n856\t doc_id: \"doc-1\".into(),\n857\t shard: shard(0),\n858\t target_nodes: vec![node(\"old-0\"), node(\"new-0\")],\n859\t completed_nodes: HashSet::new(),\n860\t failed_nodes: HashMap::new(),\n861\t submitted_at: Instant::now(),\n862\t });\n863\t\n864\t assert!(!coord.is_drained());\n865\t\n866\t coord.ack_write(\"doc-1\", &node(\"old-0\"));\n867\t coord.fail_write(\"doc-1\", &node(\"new-0\"), \"timeout\".into());\n868\t assert!(coord.is_drained());\n869\t }\n870\t\n871\t #[test]\n872\t fn test_invalid_transitions() {\n873\t let config = MigrationConfig::default();\n874\t let mut coord = MigrationCoordinator::new(config);\n875\t\n876\t let affected = HashMap::from([(shard(0), node(\"old-0\"))]);\n877\t let mid = coord.begin_migration(node(\"new-0\"), 0, affected).unwrap();\n878\t\n879\t // shard_migration_complete on Pending shard should fail\n880\t let err = coord.shard_migration_complete(mid, shard(0), 10).unwrap_err();\n881\t assert!(matches!(err, MigrationError::InvalidTransition(_, _)));\n882\t\n883\t // NotFound for invalid migration\n884\t let err = coord.begin_cutover(MigrationId(999)).unwrap_err();\n885\t assert!(matches!(err, MigrationError::NotFound(_)));\n886\t\n887\t // complete_drain on non-draining phase\n888\t let err = coord.complete_drain(mid).unwrap_err();\n889\t assert!(matches!(err, MigrationError::InvalidTransition(_, _)));\n890\t\n891\t // complete_cleanup on wrong phase\n892\t let err = coord.complete_cleanup(mid).unwrap_err();\n893\t assert!(matches!(err, MigrationError::InvalidTransition(_, _)));\n894\t }\n895\t\n896\t #[test]\n897\t fn test_migration_config_access() {\n898\t let config = MigrationConfig::default();\n899\t let coord = MigrationCoordinator::new(config.clone());\n900\t assert_eq!(coord.config().drain_timeout, config.drain_timeout);\n901\t }\n902\t\n903\t #[test]\n904\t fn test_dual_write_tracking() {\n905\t let config = MigrationConfig::default();\n906\t let mut coord = MigrationCoordinator::new(config);\n907\t\n908\t let affected = HashMap::from([(shard(5), node(\"old-0\"))]);\n909\t let mid = coord.begin_migration(node(\"new-0\"), 0, affected).unwrap();\n910\t coord.begin_dual_write(mid).unwrap();\n911\t\n912\t // Shard 5 is in dual-write\n913\t assert!(coord.is_dual_write_active(shard(5)));\n914\t // Shard 99 is not being migrated\n915\t assert!(!coord.is_dual_write_active(shard(99)));\n916\t\n917\t // After migration completes, shard 5 is no longer dual-write\n918\t coord.shard_migration_complete(mid, shard(5), 100).unwrap();\n919\t assert!(!coord.is_dual_write_active(shard(5)));\n920\t }\n921\t}\n922\t"}]},"parent_tool_use_id":null,"session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","uuid":"45251170-d4ac-4774-9941-f71e8715c83d","timestamp":"2026-05-23T05:58:28.226Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/crates/miroir-core/src/migration.rs","content":"//! Shard migration cutover state machine.\n//!\n//! Implements the node-addition migration flow from plan §4 with explicit state\n//! transitions and a race-window-safe cutover sequence.\n//!\n//! ## Race window analysis (plan §15 OP#1)\n//!\n//! The dangerous window is between \"mark node active\" (routing changes to new-node-only)\n//! and \"delete migrated shard from old node.\" A document written during dual-write that\n//! succeeded on OLD but failed on NEW — and arrived after the last migration page —\n//! would be deleted from OLD without ever reaching NEW.\n//!\n//! ## Solution: quiesce-then-verify cutover\n//!\n//! Instead of the naïve sequence (mark active → stop dual-write → delete old), we use:\n//!\n//! 1. Stop dual-write (no new writes go to either node for affected shards)\n//! 2. Drain: wait for all in-flight writes to both OLD and NEW to complete\n//! 3. Delta migration: re-read affected shards from OLD (catches anything written since\n//! the last migration page) and write deltas to NEW\n//! 4. Mark node active (routing switches to NEW-only)\n//! 5. Delete migrated shard from OLD\n//!\n//! Step 3 is the key: it closes the race window by ensuring NEW has a complete picture\n//! before we commit the routing change. The cost is one extra pagination pass over each\n//! migrated shard — bounded by the number of docs written during the migration window.\n\nuse std::collections::{HashMap, HashSet};\nuse std::fmt;\nuse std::time::{Duration, Instant};\n\nuse serde::{Deserialize, Serialize};\n\n/// Unique identifier for a shard migration operation.\n#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]\npub struct MigrationId(pub u64);\n\nimpl fmt::Display for MigrationId {\n fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {\n write!(f, \"{}\", self.0)\n }\n}\n\n/// Identifier for a physical node in the cluster.\n#[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]\npub struct NodeId(pub String);\n\n// Type alias for external use (rebalancer, etc.)\npub type MigrationNodeId = NodeId;\n\nimpl fmt::Display for NodeId {\n fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {\n write!(f, \"{}\", self.0)\n }\n}\n\n/// Identifier for a logical shard.\n#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]\npub struct ShardId(pub u32);\n\nimpl fmt::Display for ShardId {\n fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {\n write!(f, \"s{}\", self.0)\n }\n}\n\n/// Per-shard migration state within a node-addition migration.\n#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]\npub enum ShardMigrationState {\n /// Waiting for background migration to begin.\n Pending,\n /// Background pagination is reading docs from source and writing to target.\n Migrating {\n docs_copied: u64,\n pages_remaining: u32,\n },\n /// Background migration complete, awaiting cutover.\n MigrationComplete { docs_copied: u64 },\n /// Dual-write stopped, in-flight writes draining.\n Draining {\n in_flight_count: u32,\n docs_copied: u64,\n },\n /// Delta pass: re-reading source to catch stragglers written during migration.\n DeltaPass {\n docs_copied: u64,\n delta_docs_copied: u64,\n },\n /// Node is active for this shard; old replica data deleted.\n Active,\n /// Migration failed at this phase.\n Failed { phase: String, reason: String },\n}\n\nimpl fmt::Display for ShardMigrationState {\n fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {\n match self {\n Self::Pending => write!(f, \"pending\"),\n Self::Migrating {\n docs_copied,\n pages_remaining,\n } => {\n write!(\n f,\n \"migrating({docs_copied} copied, {pages_remaining} pages left)\"\n )\n }\n Self::MigrationComplete { docs_copied } => {\n write!(f, \"migration_complete({docs_copied} copied)\")\n }\n Self::Draining {\n in_flight_count,\n docs_copied,\n } => {\n write!(\n f,\n \"draining({in_flight_count} in-flight, {docs_copied} copied)\"\n )\n }\n Self::DeltaPass {\n docs_copied,\n delta_docs_copied,\n } => {\n write!(f, \"delta_pass({docs_copied} + {delta_docs_copied} copied)\")\n }\n Self::Active => write!(f, \"active\"),\n Self::Failed { phase, reason } => write!(f, \"failed({phase}: {reason})\"),\n }\n }\n}\n\n/// Overall migration phase for a node addition.\n#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]\npub enum MigrationPhase {\n /// Computing which shards move to the new node.\n ComputingAssignments,\n /// Dual-write active; background migration in progress.\n DualWriteMigrating,\n /// Background migration done; beginning cutover.\n CutoverBegin,\n /// Stopping dual-write; waiting for in-flight writes to settle.\n CutoverDraining,\n /// Re-reading source to catch docs written during migration.\n CutoverDeltaPass,\n /// Marking new node active; switching routing.\n CutoverActivate,\n /// Deleting migrated shard data from old nodes.\n CutoverCleanup,\n /// All shards migrated; migration complete.\n Complete,\n /// Migration failed.\n Failed(String),\n}\n\nimpl fmt::Display for MigrationPhase {\n fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {\n match self {\n Self::ComputingAssignments => write!(f, \"computing_assignments\"),\n Self::DualWriteMigrating => write!(f, \"dual_write_migrating\"),\n Self::CutoverBegin => write!(f, \"cutover_begin\"),\n Self::CutoverDraining => write!(f, \"cutover_draining\"),\n Self::CutoverDeltaPass => write!(f, \"cutover_delta_pass\"),\n Self::CutoverActivate => write!(f, \"cutover_activate\"),\n Self::CutoverCleanup => write!(f, \"cutover_cleanup\"),\n Self::Complete => write!(f, \"complete\"),\n Self::Failed(msg) => write!(f, \"failed({msg})\"),\n }\n }\n}\n\n/// A single document write targeting a shard during migration.\n#[derive(Debug, Clone)]\npub struct InFlightWrite {\n pub doc_id: String,\n pub shard: ShardId,\n pub target_nodes: Vec,\n pub completed_nodes: HashSet,\n pub failed_nodes: HashMap,\n pub submitted_at: Instant,\n}\n\n// Serialize Instant as a placeholder bool (present/absent).\n// Instant is monotonic and not meaningfully serializable across processes;\n// on deserialize, reconstruct as Instant::now().\nmod instant_serde {\n use serde::{Deserialize, Deserializer, Serialize, Serializer};\n use std::time::Instant;\n\n pub fn serialize(instant: &Option, serializer: S) -> Result\n where\n S: Serializer,\n {\n instant.is_some().serialize(serializer)\n }\n\n pub fn deserialize<'de, D>(deserializer: D) -> Result, D::Error>\n where\n D: Deserializer<'de>,\n {\n let present = bool::deserialize(deserializer)?;\n Ok(if present { Some(Instant::now()) } else { None })\n }\n}\n\n/// Configuration for migration cutover behavior.\n#[derive(Debug, Clone, Serialize, Deserialize)]\npub struct MigrationConfig {\n /// Maximum time to wait for in-flight writes to drain during cutover.\n pub drain_timeout: Duration,\n /// Whether to perform the delta pass (re-read source after stopping dual-write).\n /// Disabling this saves a pagination pass but opens the race window — only safe\n /// when anti-entropy is enabled as a safety net.\n pub skip_delta_pass: bool,\n /// Whether anti-entropy is enabled — used to determine if skip_delta_pass is safe.\n pub anti_entropy_enabled: bool,\n}\n\nimpl Default for MigrationConfig {\n fn default() -> Self {\n Self {\n drain_timeout: Duration::from_secs(30),\n skip_delta_pass: false,\n anti_entropy_enabled: true,\n }\n }\n}\n\n/// Error type for migration operations.\n#[derive(Debug, thiserror::Error)]\npub enum MigrationError {\n #[error(\n \"anti-entropy is disabled and delta pass is skipped — documents may be lost at cutover\"\n )]\n UnsafeCutoverNoAntiEntropy,\n #[error(\"drain timeout exceeded: {0} in-flight writes still pending\")]\n DrainTimeout(u32),\n #[error(\"shard {0} is not in a valid state for this transition (current: {1})\")]\n InvalidTransition(ShardId, String),\n #[error(\"migration {0} not found\")]\n NotFound(MigrationId),\n #[error(\"delta pass failed for shard {0}: {1}\")]\n DeltaPassFailed(ShardId, String),\n}\n\n/// Tracks the state of a node-addition migration.\n#[derive(Debug, Clone, Serialize, Deserialize)]\npub struct MigrationState {\n pub id: MigrationId,\n pub new_node: NodeId,\n pub replica_group: u32,\n pub phase: MigrationPhase,\n pub affected_shards: HashMap,\n /// Maps shard → old node that currently owns it.\n pub old_owners: HashMap,\n #[serde(with = \"instant_serde\")]\n pub started_at: Option,\n #[serde(with = \"instant_serde\")]\n pub completed_at: Option,\n}\n\n/// The migration coordinator manages shard migration state transitions.\npub struct MigrationCoordinator {\n config: MigrationConfig,\n migrations: HashMap,\n next_id: u64,\n /// In-flight writes being tracked for drain during cutover.\n in_flight: Vec,\n}\n\nimpl MigrationCoordinator {\n pub fn new(config: MigrationConfig) -> Self {\n Self {\n config,\n migrations: HashMap::new(),\n next_id: 0,\n in_flight: Vec::new(),\n }\n }\n\n /// Validate migration safety before starting. Returns an error if the configuration\n /// would allow data loss at the cutover boundary.\n pub fn validate_safety(&self) -> Result<(), MigrationError> {\n if self.config.skip_delta_pass && !self.config.anti_entropy_enabled {\n return Err(MigrationError::UnsafeCutoverNoAntiEntropy);\n }\n Ok(())\n }\n\n /// Begin a new node-addition migration.\n pub fn begin_migration(\n &mut self,\n new_node: NodeId,\n replica_group: u32,\n affected_shards: HashMap,\n ) -> Result {\n self.validate_safety()?;\n\n let id = MigrationId(self.next_id);\n self.next_id += 1;\n\n let shard_states: HashMap = affected_shards\n .keys()\n .map(|&shard| (shard, ShardMigrationState::Pending))\n .collect();\n\n let state = MigrationState {\n id,\n new_node,\n replica_group,\n phase: MigrationPhase::ComputingAssignments,\n affected_shards: shard_states,\n old_owners: affected_shards,\n started_at: Some(Instant::now()),\n completed_at: None,\n };\n\n self.migrations.insert(id, state);\n Ok(id)\n }\n\n /// Transition to dual-write + background migration phase.\n pub fn begin_dual_write(&mut self, id: MigrationId) -> Result<(), MigrationError> {\n let state = self\n .migrations\n .get_mut(&id)\n .ok_or(MigrationError::NotFound(id))?;\n state.phase = MigrationPhase::DualWriteMigrating;\n for shard_state in state.affected_shards.values_mut() {\n if *shard_state == ShardMigrationState::Pending {\n *shard_state = ShardMigrationState::Migrating {\n docs_copied: 0,\n pages_remaining: 0,\n };\n }\n }\n Ok(())\n }\n\n /// Record that a shard's background migration completed.\n pub fn shard_migration_complete(\n &mut self,\n id: MigrationId,\n shard: ShardId,\n docs_copied: u64,\n ) -> Result<(), MigrationError> {\n let state = self\n .migrations\n .get_mut(&id)\n .ok_or(MigrationError::NotFound(id))?;\n let shard_state = state.affected_shards.get_mut(&shard).ok_or_else(|| {\n MigrationError::InvalidTransition(shard, \"shard not in migration\".into())\n })?;\n\n match shard_state {\n ShardMigrationState::Migrating { .. } => {\n *shard_state = ShardMigrationState::MigrationComplete { docs_copied };\n }\n _ => {\n return Err(MigrationError::InvalidTransition(\n shard,\n shard_state.to_string(),\n ));\n }\n }\n\n // Check if all shards are done migrating\n let all_complete = state\n .affected_shards\n .values()\n .all(|s| matches!(s, ShardMigrationState::MigrationComplete { .. }));\n\n if all_complete {\n state.phase = MigrationPhase::CutoverBegin;\n }\n\n Ok(())\n }\n\n /// Begin the cutover sequence: stop dual-write and drain in-flight writes.\n pub fn begin_cutover(&mut self, id: MigrationId) -> Result {\n let state = self\n .migrations\n .get_mut(&id)\n .ok_or(MigrationError::NotFound(id))?;\n\n if !matches!(state.phase, MigrationPhase::CutoverBegin) {\n return Err(MigrationError::InvalidTransition(\n ShardId(0),\n format!(\"expected CutoverBegin, got {}\", state.phase),\n ));\n }\n\n // Transition all shards to Draining\n let total_in_flight = self.in_flight.len() as u32;\n for (shard, shard_state) in state.affected_shards.iter_mut() {\n match shard_state {\n ShardMigrationState::MigrationComplete { docs_copied } => {\n *shard_state = ShardMigrationState::Draining {\n in_flight_count: total_in_flight,\n docs_copied: *docs_copied,\n };\n }\n _ => {\n return Err(MigrationError::InvalidTransition(\n *shard,\n shard_state.to_string(),\n ));\n }\n }\n }\n\n state.phase = MigrationPhase::CutoverDraining;\n Ok(state.phase.clone())\n }\n\n /// Register an in-flight write for tracking during drain.\n pub fn register_in_flight(&mut self, write: InFlightWrite) {\n self.in_flight.push(write);\n }\n\n /// Acknowledge completion of a write to a specific node.\n pub fn ack_write(&mut self, doc_id: &str, node: &NodeId) {\n for write in &mut self.in_flight {\n if write.doc_id == doc_id {\n write.completed_nodes.insert(node.clone());\n }\n }\n }\n\n /// Mark a write as failed on a specific node.\n pub fn fail_write(&mut self, doc_id: &str, node: &NodeId, reason: String) {\n for write in &mut self.in_flight {\n if write.doc_id == doc_id {\n write.failed_nodes.insert(node.clone(), reason.clone());\n }\n }\n }\n\n /// Check if all in-flight writes have completed (drained).\n pub fn is_drained(&self) -> bool {\n self.in_flight\n .iter()\n .all(|w| w.completed_nodes.len() + w.failed_nodes.len() == w.target_nodes.len())\n }\n\n /// Complete the drain and move to delta pass or activation.\n pub fn complete_drain(&mut self, id: MigrationId) -> Result {\n // First check phase exists without holding mutable borrow\n let phase = self\n .migrations\n .get(&id)\n .ok_or(MigrationError::NotFound(id))?\n .phase\n .clone();\n\n if !matches!(phase, MigrationPhase::CutoverDraining) {\n return Err(MigrationError::InvalidTransition(\n ShardId(0),\n format!(\"expected CutoverDraining, got {}\", phase),\n ));\n }\n\n // Check drain status\n if !self.is_drained() {\n let remaining = self\n .in_flight\n .iter()\n .filter(|w| w.completed_nodes.len() + w.failed_nodes.len() < w.target_nodes.len())\n .count() as u32;\n return Err(MigrationError::DrainTimeout(remaining));\n }\n\n // Collect docs that need delta pass\n let needs_delta = self.collect_delta_candidates(id)?;\n let skip_delta = self.config.skip_delta_pass;\n\n // Now get mutable borrow to update state\n let state = self\n .migrations\n .get_mut(&id)\n .ok_or(MigrationError::NotFound(id))?;\n\n if skip_delta {\n // Skip delta pass — safe only if anti-entropy is enabled\n state.phase = MigrationPhase::CutoverActivate;\n } else if needs_delta.is_empty() {\n state.phase = MigrationPhase::CutoverActivate;\n } else {\n state.phase = MigrationPhase::CutoverDeltaPass;\n for (_shard, shard_state) in state.affected_shards.iter_mut() {\n if let ShardMigrationState::Draining { docs_copied, .. } = shard_state {\n *shard_state = ShardMigrationState::DeltaPass {\n docs_copied: *docs_copied,\n delta_docs_copied: 0,\n };\n }\n }\n }\n\n self.in_flight.clear();\n\n // If going to activate, do that now (drop mutable borrow first)\n let next_phase = state.phase.clone();\n if matches!(next_phase, MigrationPhase::CutoverActivate) {\n let _ = state;\n self.activate_shards(id)?;\n // Return the new phase after activation\n return Ok(self\n .migrations\n .get(&id)\n .map(|s| s.phase.clone())\n .unwrap_or(MigrationPhase::CutoverCleanup));\n }\n\n Ok(next_phase)\n }\n\n /// Identify writes that need the delta pass — those that succeeded on OLD but\n /// failed (or never reached) NEW.\n fn collect_delta_candidates(\n &self,\n id: MigrationId,\n ) -> Result>, MigrationError> {\n let state = self\n .migrations\n .get(&id)\n .ok_or(MigrationError::NotFound(id))?;\n let mut candidates: HashMap> = HashMap::new();\n\n for write in &self.in_flight {\n let old_owner = match state.old_owners.get(&write.shard) {\n Some(owner) => owner,\n None => continue,\n };\n\n let succeeded_on_old = write.completed_nodes.contains(old_owner);\n let succeeded_on_new = write.completed_nodes.contains(&state.new_node);\n\n // Doc is on OLD but not on NEW — delta pass must catch it\n if succeeded_on_old && !succeeded_on_new {\n candidates\n .entry(write.shard)\n .or_default()\n .push(write.doc_id.clone());\n }\n }\n\n Ok(candidates)\n }\n\n /// Record that the delta pass completed for a shard.\n pub fn shard_delta_complete(\n &mut self,\n id: MigrationId,\n shard: ShardId,\n delta_docs: u64,\n ) -> Result<(), MigrationError> {\n let state = self\n .migrations\n .get_mut(&id)\n .ok_or(MigrationError::NotFound(id))?;\n let shard_state = state.affected_shards.get_mut(&shard).ok_or_else(|| {\n MigrationError::InvalidTransition(shard, \"shard not in migration\".into())\n })?;\n\n match shard_state {\n ShardMigrationState::DeltaPass { docs_copied, .. } => {\n *shard_state = ShardMigrationState::MigrationComplete {\n docs_copied: *docs_copied + delta_docs,\n };\n }\n _ => {\n return Err(MigrationError::InvalidTransition(\n shard,\n shard_state.to_string(),\n ));\n }\n }\n\n // Check if all shards done with delta\n let all_complete = state\n .affected_shards\n .values()\n .all(|s| matches!(s, ShardMigrationState::MigrationComplete { .. }));\n\n if all_complete {\n state.phase = MigrationPhase::CutoverActivate;\n self.activate_shards(id)?;\n }\n\n Ok(())\n }\n\n /// Mark all affected shards as active on the new node.\n fn activate_shards(&mut self, id: MigrationId) -> Result<(), MigrationError> {\n let state = self\n .migrations\n .get_mut(&id)\n .ok_or(MigrationError::NotFound(id))?;\n\n for shard_state in state.affected_shards.values_mut() {\n match shard_state {\n ShardMigrationState::MigrationComplete { .. }\n | ShardMigrationState::Draining { .. } => {\n *shard_state = ShardMigrationState::Active;\n }\n _ => {}\n }\n }\n\n if matches!(state.phase, MigrationPhase::CutoverActivate) {\n state.phase = MigrationPhase::CutoverCleanup;\n }\n\n Ok(())\n }\n\n /// Complete the migration by deleting migrated shard data from old nodes.\n pub fn complete_cleanup(&mut self, id: MigrationId) -> Result<(), MigrationError> {\n let state = self\n .migrations\n .get_mut(&id)\n .ok_or(MigrationError::NotFound(id))?;\n\n if !matches!(state.phase, MigrationPhase::CutoverCleanup) {\n return Err(MigrationError::InvalidTransition(\n ShardId(0),\n format!(\"expected CutoverCleanup, got {}\", state.phase),\n ));\n }\n\n state.phase = MigrationPhase::Complete;\n state.completed_at = Some(Instant::now());\n Ok(())\n }\n\n /// Get the current state of a migration.\n pub fn get_state(&self, id: MigrationId) -> Option<&MigrationState> {\n self.migrations.get(&id)\n }\n\n /// Check if a write should go to both old and new node (dual-write phase).\n pub fn is_dual_write_active(&self, shard: ShardId) -> bool {\n self.migrations.values().any(|m| {\n matches!(m.phase, MigrationPhase::DualWriteMigrating)\n && matches!(\n m.affected_shards.get(&shard),\n Some(ShardMigrationState::Migrating { .. })\n )\n })\n }\n\n /// Get all migration states for inspection (e.g., by router for dual-write).\n pub fn get_all_migrations(&self) -> &HashMap {\n &self.migrations\n }\n\n /// Get the migration config.\n pub fn config(&self) -> &MigrationConfig {\n &self.config\n }\n}\n\n#[cfg(test)]\nmod tests {\n use super::*;\n\n fn node(s: &str) -> NodeId {\n NodeId(s.to_string())\n }\n\n fn shard(id: u32) -> ShardId {\n ShardId(id)\n }\n\n #[test]\n fn test_safe_cutover_with_delta_pass() {\n let config = MigrationConfig {\n anti_entropy_enabled: false,\n skip_delta_pass: false,\n ..Default::default()\n };\n let mut coord = MigrationCoordinator::new(config);\n\n let affected = HashMap::from([(shard(0), node(\"old-0\")), (shard(1), node(\"old-0\"))]);\n\n let mid = coord.begin_migration(node(\"new-0\"), 0, affected).unwrap();\n coord.begin_dual_write(mid).unwrap();\n\n // Simulate background migration completing\n coord.shard_migration_complete(mid, shard(0), 500).unwrap();\n coord.shard_migration_complete(mid, shard(1), 300).unwrap();\n\n // Register an in-flight write that succeeded on OLD but not NEW.\n // The write must be marked as failed on NEW so is_drained() sees\n // completed + failed == target count.\n coord.register_in_flight(InFlightWrite {\n doc_id: \"doc-at-boundary\".into(),\n shard: shard(0),\n target_nodes: vec![node(\"old-0\"), node(\"new-0\")],\n completed_nodes: HashSet::from([node(\"old-0\")]),\n failed_nodes: HashMap::from([(node(\"new-0\"), \"write failed\".into())]),\n submitted_at: Instant::now(),\n });\n\n // Cutover\n coord.begin_cutover(mid).unwrap();\n\n // The drain sees the in-flight write completed (on old, not on new)\n // Delta pass should be triggered\n let phase = coord.complete_drain(mid).unwrap();\n assert_eq!(phase, MigrationPhase::CutoverDeltaPass);\n\n // Delta pass catches the straggler\n coord.shard_delta_complete(mid, shard(0), 1).unwrap();\n // Shard 1 had no stragglers, but needs delta complete too\n coord.shard_delta_complete(mid, shard(1), 0).unwrap();\n\n // Now activation and cleanup\n let state = coord.get_state(mid).unwrap();\n assert_eq!(state.phase, MigrationPhase::CutoverCleanup);\n\n coord.complete_cleanup(mid).unwrap();\n let state = coord.get_state(mid).unwrap();\n assert_eq!(state.phase, MigrationPhase::Complete);\n }\n\n #[test]\n fn test_unsafe_cutover_refused_without_anti_entropy() {\n let config = MigrationConfig {\n anti_entropy_enabled: false,\n skip_delta_pass: true,\n ..Default::default()\n };\n let mut coord = MigrationCoordinator::new(config);\n\n let affected = HashMap::from([(shard(0), node(\"old-0\"))]);\n let result = coord.begin_migration(node(\"new-0\"), 0, affected);\n\n assert!(result.is_err());\n let err = result.unwrap_err();\n assert!(matches!(err, MigrationError::UnsafeCutoverNoAntiEntropy));\n }\n\n #[test]\n fn test_skip_delta_pass_allowed_with_anti_entropy() {\n let config = MigrationConfig {\n anti_entropy_enabled: true,\n skip_delta_pass: true,\n ..Default::default()\n };\n let mut coord = MigrationCoordinator::new(config);\n\n let affected = HashMap::from([(shard(0), node(\"old-0\"))]);\n let mid = coord.begin_migration(node(\"new-0\"), 0, affected).unwrap();\n coord.begin_dual_write(mid).unwrap();\n coord.shard_migration_complete(mid, shard(0), 100).unwrap();\n\n coord.begin_cutover(mid).unwrap();\n\n // With skip_delta_pass=true and AE enabled, drain goes straight to activate\n let phase = coord.complete_drain(mid).unwrap();\n assert_eq!(phase, MigrationPhase::CutoverCleanup);\n\n coord.complete_cleanup(mid).unwrap();\n assert_eq!(\n coord.get_state(mid).unwrap().phase,\n MigrationPhase::Complete\n );\n }\n\n #[test]\n fn test_drain_timeout_blocks_cutover() {\n let config = MigrationConfig {\n anti_entropy_enabled: true,\n skip_delta_pass: true,\n ..Default::default()\n };\n let mut coord = MigrationCoordinator::new(config);\n\n let affected = HashMap::from([(shard(0), node(\"old-0\"))]);\n let mid = coord.begin_migration(node(\"new-0\"), 0, affected).unwrap();\n coord.begin_dual_write(mid).unwrap();\n coord.shard_migration_complete(mid, shard(0), 100).unwrap();\n coord.begin_cutover(mid).unwrap();\n\n // Register an in-flight write that hasn't completed on either node\n coord.register_in_flight(InFlightWrite {\n doc_id: \"stuck-doc\".into(),\n shard: shard(0),\n target_nodes: vec![node(\"old-0\"), node(\"new-0\")],\n completed_nodes: HashSet::new(),\n failed_nodes: HashMap::new(),\n submitted_at: Instant::now(),\n });\n\n // Drain should fail — write still in flight\n let result = coord.complete_drain(mid);\n assert!(result.is_err());\n assert!(matches!(\n result.unwrap_err(),\n MigrationError::DrainTimeout(1)\n ));\n }\n\n #[test]\n fn test_display_impls() {\n assert_eq!(format!(\"{}\", MigrationId(42)), \"42\");\n assert_eq!(format!(\"{}\", NodeId(\"n1\".into())), \"n1\");\n assert_eq!(format!(\"{}\", ShardId(7)), \"s7\");\n assert_eq!(format!(\"{}\", ShardMigrationState::Pending), \"pending\");\n assert_eq!(\n format!(\"{}\", ShardMigrationState::Migrating { docs_copied: 100, pages_remaining: 3 }),\n \"migrating(100 copied, 3 pages left)\"\n );\n assert_eq!(\n format!(\"{}\", ShardMigrationState::MigrationComplete { docs_copied: 500 }),\n \"migration_complete(500 copied)\"\n );\n assert_eq!(\n format!(\"{}\", ShardMigrationState::Draining { in_flight_count: 2, docs_copied: 500 }),\n \"draining(2 in-flight, 500 copied)\"\n );\n assert_eq!(\n format!(\"{}\", ShardMigrationState::DeltaPass { docs_copied: 500, delta_docs_copied: 3 }),\n \"delta_pass(500 + 3 copied)\"\n );\n assert_eq!(format!(\"{}\", ShardMigrationState::Active), \"active\");\n assert_eq!(\n format!(\"{}\", ShardMigrationState::Failed { phase: \"cutover\".into(), reason: \"oops\".into() }),\n \"failed(cutover: oops)\"\n );\n\n assert_eq!(format!(\"{}\", MigrationPhase::ComputingAssignments), \"computing_assignments\");\n assert_eq!(format!(\"{}\", MigrationPhase::DualWriteMigrating), \"dual_write_migrating\");\n assert_eq!(format!(\"{}\", MigrationPhase::CutoverBegin), \"cutover_begin\");\n assert_eq!(format!(\"{}\", MigrationPhase::CutoverDraining), \"cutover_draining\");\n assert_eq!(format!(\"{}\", MigrationPhase::CutoverDeltaPass), \"cutover_delta_pass\");\n assert_eq!(format!(\"{}\", MigrationPhase::CutoverActivate), \"cutover_activate\");\n assert_eq!(format!(\"{}\", MigrationPhase::CutoverCleanup), \"cutover_cleanup\");\n assert_eq!(format!(\"{}\", MigrationPhase::Complete), \"complete\");\n assert_eq!(format!(\"{}\", MigrationPhase::Failed(\"err\".into())), \"failed(err)\");\n }\n\n #[test]\n fn test_ack_and_fail_write_tracking() {\n let config = MigrationConfig::default();\n let mut coord = MigrationCoordinator::new(config);\n\n let affected = HashMap::from([(shard(0), node(\"old-0\"))]);\n let mid = coord.begin_migration(node(\"new-0\"), 0, affected).unwrap();\n coord.begin_dual_write(mid).unwrap();\n coord.shard_migration_complete(mid, shard(0), 100).unwrap();\n\n coord.register_in_flight(InFlightWrite {\n doc_id: \"doc-1\".into(),\n shard: shard(0),\n target_nodes: vec![node(\"old-0\"), node(\"new-0\")],\n completed_nodes: HashSet::new(),\n failed_nodes: HashMap::new(),\n submitted_at: Instant::now(),\n });\n\n assert!(!coord.is_drained());\n\n coord.ack_write(\"doc-1\", &node(\"old-0\"));\n coord.fail_write(\"doc-1\", &node(\"new-0\"), \"timeout\".into());\n assert!(coord.is_drained());\n }\n\n #[test]\n fn test_invalid_transitions() {\n let config = MigrationConfig::default();\n let mut coord = MigrationCoordinator::new(config);\n\n let affected = HashMap::from([(shard(0), node(\"old-0\"))]);\n let mid = coord.begin_migration(node(\"new-0\"), 0, affected).unwrap();\n\n // shard_migration_complete on Pending shard should fail\n let err = coord.shard_migration_complete(mid, shard(0), 10).unwrap_err();\n assert!(matches!(err, MigrationError::InvalidTransition(_, _)));\n\n // NotFound for invalid migration\n let err = coord.begin_cutover(MigrationId(999)).unwrap_err();\n assert!(matches!(err, MigrationError::NotFound(_)));\n\n // complete_drain on non-draining phase\n let err = coord.complete_drain(mid).unwrap_err();\n assert!(matches!(err, MigrationError::InvalidTransition(_, _)));\n\n // complete_cleanup on wrong phase\n let err = coord.complete_cleanup(mid).unwrap_err();\n assert!(matches!(err, MigrationError::InvalidTransition(_, _)));\n }\n\n #[test]\n fn test_migration_config_access() {\n let config = MigrationConfig::default();\n let coord = MigrationCoordinator::new(config.clone());\n assert_eq!(coord.config().drain_timeout, config.drain_timeout);\n }\n\n #[test]\n fn test_dual_write_tracking() {\n let config = MigrationConfig::default();\n let mut coord = MigrationCoordinator::new(config);\n\n let affected = HashMap::from([(shard(5), node(\"old-0\"))]);\n let mid = coord.begin_migration(node(\"new-0\"), 0, affected).unwrap();\n coord.begin_dual_write(mid).unwrap();\n\n // Shard 5 is in dual-write\n assert!(coord.is_dual_write_active(shard(5)));\n // Shard 99 is not being migrated\n assert!(!coord.is_dual_write_active(shard(99)));\n\n // After migration completes, shard 5 is no longer dual-write\n coord.shard_migration_complete(mid, shard(5), 100).unwrap();\n assert!(!coord.is_dual_write_active(shard(5)));\n }\n}\n","numLines":922,"startLine":1,"totalLines":922}}} -{"type":"system","subtype":"status","status":"requesting","uuid":"24b63c78-e567-4622-9a95-26da905f9e69","session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97"} -{"type":"stream_event","event":{"type":"message_start","message":{"id":"msg_2026052313583075eb6bf787824674","type":"message","role":"assistant","model":"glm-4.7","content":[],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0}}},"session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","parent_tool_use_id":null,"uuid":"db081acf-c0c2-4e75-8619-b8b285c716ce","ttft_ms":2113} 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Let me create a todo list for the rebalancer background worker implementation and start working on it.\n\nLooking at the existing `rebalancer_worker/mod.rs`, I can see there's already a substantial implementation. However, there are some issues and gaps that need to be addressed:\n\n1. The leader lease acquisition logic seems to be implemented but could use some refinement\n2. The event handling for topology changes is implemented\n3. The migration state machine is being driven through the process_job method\n4. Metrics are being updated\n5. Progress persistence is implemented\n\nLet me analyze what needs to be fixed or completed:\n\n1. **Leader lease scope**: The current implementation uses `rebalance:` but also includes a \"default\" scope. 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Acceptance tests for the rebalancer worker (P4.1).\n2\t//!\n3\t//! These tests verify the three key acceptance criteria:\n4\t//! 1. Advisory lock: only one pod runs the rebalancer at a time\n5\t//! 2. Progress persistence: pod restart resumes without starting over\n6\t//! 3. Metrics tick: documents migrated counter monotonically increases\n7\t\n8\tuse super::*;\n9\tuse crate::error::Result;\n10\tuse crate::migration::{MigrationConfig, MigrationCoordinator};\n11\tuse crate::task_store::{JobRow, LeaderLeaseRow, NewJob, TaskStore, NewCanary, CanaryRow, NewCdcCursor, CdcCursorRow, NewTenantMapping, TenantMapRow, NewRolloverPolicy, RolloverPolicyRow, NewSearchUiConfig, SearchUiConfigRow, NewAdminSession, AdminSessionRow};\n12\tuse crate::topology::{Node, NodeId as TopologyNodeId, Topology};\n13\tuse std::sync::Arc;\n14\tuse tokio::sync::RwLock;\n15\t\n16\t/// Create a test topology with 4 nodes across 2 replica groups.\n17\tfn test_topology() -> Topology {\n18\t let mut topo = Topology::new(64, 2, 2);\n19\t topo.add_node(Node::new(\n20\t TopologyNodeId::new(\"node-0\".into()),\n21\t \"http://node-0:7700\".into(),\n22\t 0,\n23\t ));\n24\t topo.add_node(Node::new(\n25\t TopologyNodeId::new(\"node-1\".into()),\n26\t \"http://node-1:7700\".into(),\n27\t 0,\n28\t ));\n29\t topo.add_node(Node::new(\n30\t TopologyNodeId::new(\"node-2\".into()),\n31\t \"http://node-2:7700\".into(),\n32\t 1,\n33\t ));\n34\t topo.add_node(Node::new(\n35\t TopologyNodeId::new(\"node-3\".into()),\n36\t \"http://node-3:7700\".into(),\n37\t 1,\n38\t ));\n39\t topo\n40\t}\n41\t\n42\t/// Test helper: create an in-memory task store for testing.\n43\tstruct MockTaskStore {\n44\t jobs: Arc>>,\n45\t leader_leases: Arc>>,\n46\t}\n47\t\n48\timpl MockTaskStore {\n49\t fn new() -> Self {\n50\t Self {\n51\t jobs: Arc::new(std::sync::Mutex::new(Vec::new())),\n52\t leader_leases: Arc::new(std::sync::Mutex::new(Vec::new())),\n53\t }\n54\t }\n55\t}\n56\t\n57\timpl TaskStore for MockTaskStore {\n58\t fn migrate(&self) -> Result<()> {\n59\t Ok(())\n60\t }\n61\t\n62\t fn insert_job(&self, job: &NewJob) -> Result<()> {\n63\t let mut jobs = self.jobs.lock().unwrap();\n64\t jobs.push(JobRow {\n65\t id: job.id.clone(),\n66\t type_: job.type_.clone(),\n67\t params: job.params.clone(),\n68\t state: job.state.clone(),\n69\t claimed_by: None,\n70\t claim_expires_at: None,\n71\t progress: job.progress.clone(),\n72\t });\n73\t Ok(())\n74\t }\n75\t\n76\t fn get_job(&self, id: &str) -> Result> {\n77\t let jobs = self.jobs.lock().unwrap();\n78\t Ok(jobs.iter().find(|j| j.id == id).cloned())\n79\t }\n80\t\n81\t fn update_job_progress(&self, _id: &str, _state: &str, _progress: &str) -> Result {\n82\t Ok(true)\n83\t }\n84\t\n85\t fn list_jobs_by_state(&self, _state: &str) -> Result> {\n86\t let jobs = self.jobs.lock().unwrap();\n87\t Ok(jobs.clone())\n88\t }\n89\t\n90\t fn try_acquire_leader_lease(\n91\t &self,\n92\t scope: &str,\n93\t holder: &str,\n94\t expires_at: i64,\n95\t now_ms: i64,\n96\t ) -> Result {\n97\t let mut leases = self.leader_leases.lock().unwrap();\n98\t\n99\t // Check if there's an existing unexpired lease\n100\t for lease in leases.iter() {\n101\t // Lease is still valid if expires_at >= now_ms (>= because we can acquire at exactly the expiration time)\n102\t if lease.scope == scope && lease.expires_at >= now_ms {\n103\t if lease.holder == holder {\n104\t return Ok(true); // Already hold the lease\n105\t }\n106\t return Ok(false); // Someone else holds it\n107\t }\n108\t }\n109\t\n110\t // No existing unexpired lease - acquire it\n111\t leases.retain(|l| l.scope != scope); // Remove any expired leases for this scope\n112\t leases.push(LeaderLeaseRow {\n113\t scope: scope.to_string(),\n114\t holder: holder.to_string(),\n115\t expires_at,\n116\t });\n117\t Ok(true)\n118\t }\n119\t\n120\t fn renew_leader_lease(&self, scope: &str, holder: &str, expires_at: i64) -> Result {\n121\t let mut leases = self.leader_leases.lock().unwrap();\n122\t for lease in leases.iter_mut() {\n123\t if lease.scope == scope && lease.holder == holder {\n124\t lease.expires_at = expires_at;\n125\t return Ok(true);\n126\t }\n127\t }\n128\t Ok(false)\n129\t }\n130\t\n131\t fn get_leader_lease(&self, scope: &str) -> Result> {\n132\t let leases = self.leader_leases.lock().unwrap();\n133\t Ok(leases.iter().find(|l| l.scope == scope).cloned())\n134\t }\n135\t\n136\t // Stub implementations for unused trait methods\n137\t fn insert_task(&self, _task: &crate::task_store::NewTask) -> Result<()> {\n138\t Ok(())\n139\t }\n140\t fn get_task(&self, _miroir_id: &str) -> Result> {\n141\t Ok(None)\n142\t }\n143\t fn update_task_status(&self, _miroir_id: &str, _status: &str) -> Result {\n144\t Ok(false)\n145\t }\n146\t fn update_node_task(&self, _miroir_id: &str, _node_id: &str, _task_uid: u64) -> Result {\n147\t Ok(false)\n148\t }\n149\t fn set_task_error(&self, _miroir_id: &str, _error: &str) -> Result {\n150\t Ok(false)\n151\t }\n152\t fn list_tasks(&self, _filter: &crate::task_store::TaskFilter) -> Result> {\n153\t Ok(Vec::new())\n154\t }\n155\t fn prune_tasks(&self, _cutoff_ms: i64, _batch_size: u32) -> Result {\n156\t Ok(0)\n157\t }\n158\t fn task_count(&self) -> Result {\n159\t Ok(0)\n160\t }\n161\t fn upsert_node_settings_version(\n162\t &self,\n163\t _index_uid: &str,\n164\t _node_id: &str,\n165\t _version: i64,\n166\t _updated_at: i64,\n167\t ) -> Result<()> {\n168\t Ok(())\n169\t }\n170\t fn get_node_settings_version(\n171\t &self,\n172\t _index_uid: &str,\n173\t _node_id: &str,\n174\t ) -> Result> {\n175\t Ok(None)\n176\t }\n177\t fn create_alias(&self, _alias: &crate::task_store::NewAlias) -> Result<()> {\n178\t Ok(())\n179\t }\n180\t fn get_alias(&self, _name: &str) -> Result> {\n181\t Ok(None)\n182\t }\n183\t fn flip_alias(&self, _name: &str, _new_uid: &str, _history_retention: usize) -> Result {\n184\t Ok(false)\n185\t }\n186\t fn delete_alias(&self, _name: &str) -> Result {\n187\t Ok(false)\n188\t }\n189\t fn list_aliases(&self) -> Result> {\n190\t Ok(Vec::new())\n191\t }\n192\t fn upsert_session(&self, _session: &crate::task_store::SessionRow) -> Result<()> {\n193\t Ok(())\n194\t }\n195\t fn get_session(&self, _session_id: &str) -> Result> {\n196\t Ok(None)\n197\t }\n198\t fn delete_expired_sessions(&self, _now_ms: i64) -> Result {\n199\t Ok(0)\n200\t }\n201\t fn insert_idempotency_entry(&self, _entry: &crate::task_store::IdempotencyEntry) -> Result<()> {\n202\t Ok(())\n203\t }\n204\t fn get_idempotency_entry(&self, _key: &str) -> Result> {\n205\t Ok(None)\n206\t }\n207\t fn delete_expired_idempotency_entries(&self, _now_ms: i64) -> Result {\n208\t Ok(0)\n209\t }\n210\t fn claim_job(&self, _id: &str, _claimed_by: &str, _claim_expires_at: i64) -> Result {\n211\t Ok(false)\n212\t }\n213\t fn renew_job_claim(&self, _id: &str, _claim_expires_at: i64) -> Result {\n214\t Ok(false)\n215\t }\n216\t fn upsert_canary(&self, _canary: &crate::task_store::NewCanary) -> Result<()> {\n217\t Ok(())\n218\t }\n219\t fn get_canary(&self, _id: &str) -> Result> {\n220\t Ok(None)\n221\t }\n222\t fn list_canaries(&self) -> Result> {\n223\t Ok(Vec::new())\n224\t }\n225\t fn delete_canary(&self, _id: &str) -> Result {\n226\t Ok(false)\n227\t }\n228\t fn insert_canary_run(&self, _run: &crate::task_store::NewCanaryRun, _run_history_limit: usize) -> Result<()> {\n229\t Ok(())\n230\t }\n231\t fn get_canary_runs(&self, _canary_id: &str, _limit: usize) -> Result> {\n232\t Ok(Vec::new())\n233\t }\n234\t fn upsert_cdc_cursor(&self, _cursor: &crate::task_store::NewCdcCursor) -> Result<()> {\n235\t Ok(())\n236\t }\n237\t fn get_cdc_cursor(&self, _sink_name: &str, _index_uid: &str) -> Result> {\n238\t Ok(None)\n239\t }\n240\t fn list_cdc_cursors(&self, _sink_name: &str) -> Result> {\n241\t Ok(Vec::new())\n242\t }\n243\t fn insert_tenant_mapping(&self, _mapping: &crate::task_store::NewTenantMapping) -> Result<()> {\n244\t Ok(())\n245\t }\n246\t fn get_tenant_mapping(&self, _api_key_hash: &[u8]) -> Result> {\n247\t Ok(None)\n248\t }\n249\t fn delete_tenant_mapping(&self, _api_key_hash: &[u8]) -> Result {\n250\t Ok(false)\n251\t }\n252\t fn upsert_rollover_policy(&self, _policy: &crate::task_store::NewRolloverPolicy) -> Result<()> {\n253\t Ok(())\n254\t }\n255\t fn get_rollover_policy(&self, _name: &str) -> Result> {\n256\t Ok(None)\n257\t }\n258\t fn list_rollover_policies(&self) -> Result> {\n259\t Ok(Vec::new())\n260\t }\n261\t fn delete_rollover_policy(&self, _name: &str) -> Result {\n262\t Ok(false)\n263\t }\n264\t fn upsert_search_ui_config(&self, _config: &crate::task_store::NewSearchUiConfig) -> Result<()> {\n265\t Ok(())\n266\t }\n267\t fn get_search_ui_config(&self, _index_uid: &str) -> Result> {\n268\t Ok(None)\n269\t }\n270\t fn delete_search_ui_config(&self, _index_uid: &str) -> Result {\n271\t Ok(false)\n272\t }\n273\t fn insert_admin_session(&self, _session: &crate::task_store::NewAdminSession) -> Result<()> {\n274\t Ok(())\n275\t }\n276\t fn get_admin_session(&self, _session_id: &str) -> Result> {\n277\t Ok(None)\n278\t }\n279\t fn revoke_admin_session(&self, _session_id: &str) -> Result {\n280\t Ok(false)\n281\t }\n282\t fn delete_expired_admin_sessions(&self, _now_ms: i64) -> Result {\n283\t Ok(0)\n284\t }\n285\t}\n286\t\n287\t/// P4.1-A1: Advisory lock ensures only one pod runs the rebalancer at a time.\n288\t#[tokio::test]\n289\tasync fn p4_1_a1_advisory_lock_prevents_duplicate_migrations() {\n290\t let topo = Arc::new(RwLock::new(test_topology()));\n291\t let task_store = Arc::new(MockTaskStore::new()) as Arc;\n292\t let config = RebalancerWorkerConfig::default();\n293\t let migration_config = MigrationConfig::default();\n294\t let coordinator = Arc::new(RwLock::new(MigrationCoordinator::new(migration_config)));\n295\t let metrics = Arc::new(RwLock::new(RebalancerMetrics::default()));\n296\t\n297\t // Create two workers simulating two different pods\n298\t let worker1 = RebalancerWorker::new(\n299\t config.clone(),\n300\t topo.clone(),\n301\t task_store.clone(),\n302\t Arc::new(Rebalancer::new(\n303\t crate::rebalancer::RebalancerConfig::default(),\n304\t topo.clone(),\n305\t MigrationConfig::default(),\n306\t )),\n307\t coordinator.clone(),\n308\t metrics.clone(),\n309\t \"pod-1\".to_string(),\n310\t );\n311\t\n312\t let worker2 = RebalancerWorker::new(\n313\t config.clone(),\n314\t topo.clone(),\n315\t task_store.clone(),\n316\t Arc::new(Rebalancer::new(\n317\t crate::rebalancer::RebalancerConfig::default(),\n318\t topo.clone(),\n319\t MigrationConfig::default(),\n320\t )),\n321\t coordinator.clone(),\n322\t metrics.clone(),\n323\t \"pod-2\".to_string(),\n324\t );\n325\t\n326\t let scope = \"rebalance:test-index\";\n327\t let now = now_ms();\n328\t let expires_at = now + 10000; // 10 seconds from now\n329\t\n330\t // Pod 1 acquires the lease\n331\t let acquired1 = tokio::task::spawn_blocking({\n332\t let task_store = task_store.clone();\n333\t let scope = scope.to_string();\n334\t let holder = \"pod-1\".to_string();\n335\t move || {\n336\t task_store.try_acquire_leader_lease(&scope, &holder, expires_at, now)\n337\t }\n338\t })\n339\t .await\n340\t .unwrap()\n341\t .unwrap();\n342\t assert!(acquired1, \"pod-1 should acquire the lease\");\n343\t\n344\t // Pod 2 tries to acquire the same lease - should fail\n345\t let acquired2 = tokio::task::spawn_blocking({\n346\t let task_store = task_store.clone();\n347\t let scope = scope.to_string();\n348\t let holder = \"pod-2\".to_string();\n349\t move || {\n350\t task_store.try_acquire_leader_lease(&scope, &holder, expires_at, now)\n351\t }\n352\t })\n353\t .await\n354\t .unwrap()\n355\t .unwrap();\n356\t assert!(!acquired2, \"pod-2 should not acquire the lease while pod-1 holds it\");\n357\t\n358\t // Pod 1 can renew its lease\n359\t let renewed1 = tokio::task::spawn_blocking({\n360\t let task_store = task_store.clone();\n361\t let scope = scope.to_string();\n362\t let holder = \"pod-1\".to_string();\n363\t move || {\n364\t task_store.renew_leader_lease(&scope, &holder, expires_at + 2000)\n365\t }\n366\t })\n367\t .await\n368\t .unwrap()\n369\t .unwrap();\n370\t assert!(renewed1, \"pod-1 should renew its lease\");\n371\t\n372\t // Pod 2 still cannot acquire\n373\t let acquired2_after = tokio::task::spawn_blocking({\n374\t let task_store = task_store.clone();\n375\t let scope = scope.to_string();\n376\t let holder = \"pod-2\".to_string();\n377\t move || {\n378\t task_store.try_acquire_leader_lease(&scope, &holder, expires_at + 3000, expires_at + 2000)\n379\t }\n380\t })\n381\t .await\n382\t .unwrap()\n383\t .unwrap();\n384\t assert!(!acquired2_after, \"pod-2 should still not acquire after pod-1 renews\");\n385\t}\n386\t\n387\t/// P4.1-A2: Progress persistence allows pod restart resumption.\n388\t#[tokio::test]\n389\tasync fn p4_1_a2_progress_persistence_pods_resume_migration() {\n390\t let topo = Arc::new(RwLock::new(test_topology()));\n391\t let task_store = Arc::new(MockTaskStore::new()) as Arc;\n392\t let config = RebalancerWorkerConfig::default();\n393\t let migration_config = MigrationConfig::default();\n394\t let coordinator = Arc::new(RwLock::new(MigrationCoordinator::new(migration_config)));\n395\t let metrics = Arc::new(RwLock::new(RebalancerMetrics::default()));\n396\t\n397\t // Create a job and persist it\n398\t let job_id = RebalanceJobId::new(\"test-index\");\n399\t let mut shard_states = HashMap::new();\n400\t shard_states.insert(\n401\t 10,\n402\t ShardState {\n403\t phase: ShardMigrationPhase::MigrationInProgress,\n404\t docs_migrated: 5000,\n405\t last_offset: 5000,\n406\t source_node: Some(\"node-0\".to_string()),\n407\t target_node: \"node-1\".to_string(),\n408\t started_at: Instant::now(),\n409\t },\n410\t );\n411\t\n412\t let job = RebalanceJob {\n413\t id: job_id.clone(),\n414\t index_uid: \"test-index\".to_string(),\n415\t replica_group: 0,\n416\t shards: shard_states,\n417\t started_at: Instant::now(),\n418\t completed_at: None,\n419\t total_docs_migrated: 5000,\n420\t paused: false,\n421\t };\n422\t\n423\t // Persist the job\n424\t let progress = serde_json::to_string(&job).unwrap();\n425\t let new_job = NewJob {\n426\t id: job.id.0.clone(),\n427\t type_: \"rebalance\".to_string(),\n428\t params: progress,\n429\t state: \"running\".to_string(),\n430\t progress: \"{\\\"total_shards\\\":1,\\\"completed\\\":0,\\\"docs_migrated\\\":5000}\".to_string(),\n431\t };\n432\t tokio::task::spawn_blocking({\n433\t let task_store = task_store.clone();\n434\t let new_job = new_job.clone();\n435\t move || {\n436\t task_store.insert_job(&new_job)\n437\t }\n438\t })\n439\t .await\n440\t .unwrap()\n441\t .unwrap();\n442\t\n443\t // Create a new worker (simulating a new pod)\n444\t let worker2 = RebalancerWorker::new(\n445\t config,\n446\t topo,\n447\t task_store.clone(),\n448\t Arc::new(Rebalancer::new(\n449\t crate::rebalancer::RebalancerConfig::default(),\n450\t Arc::new(RwLock::new(test_topology())),\n451\t MigrationConfig::default(),\n452\t )),\n453\t coordinator,\n454\t metrics,\n455\t \"pod-2\".to_string(),\n456\t );\n457\t\n458\t // Load persisted jobs\n459\t worker2.load_persisted_jobs().await.unwrap();\n460\t\n461\t // Verify the job was loaded\n462\t let jobs = worker2.jobs.read().await;\n463\t let loaded_job = jobs.get(&job_id).unwrap();\n464\t assert_eq!(loaded_job.index_uid, \"test-index\");\n465\t assert_eq!(loaded_job.total_docs_migrated, 5000);\n466\t assert_eq!(loaded_job.shards.len(), 1);\n467\t\n468\t // Verify the shard state was preserved\n469\t let shard_state = loaded_job.shards.get(&10).unwrap();\n470\t assert_eq!(shard_state.docs_migrated, 5000);\n471\t assert_eq!(shard_state.last_offset, 5000);\n472\t assert!(matches!(\n473\t shard_state.phase,\n474\t ShardMigrationPhase::MigrationInProgress\n475\t ));\n476\t}\n477\t\n478\t/// P4.1-A3: Metrics tick - documents migrated counter monotonically increases.\n479\t#[tokio::test]\n480\tasync fn p4_1_a3_metrics_monotonically_increase() {\n481\t let metrics = Arc::new(RwLock::new(RebalancerMetrics::default()));\n482\t\n483\t // Start a rebalance\n484\t {\n485\t let mut m = metrics.write().await;\n486\t m.start_rebalance();\n487\t }\n488\t\n489\t // Record some documents migrated\n490\t {\n491\t let mut m = metrics.write().await;\n492\t m.record_documents_migrated(100);\n493\t m.record_documents_migrated(200);\n494\t m.record_documents_migrated(150);\n495\t }\n496\t\n497\t // Verify the counter monotonically increased\n498\t let m = metrics.read().await;\n499\t assert_eq!(m.documents_migrated_total, 450);\n500\t assert!(m.current_duration_secs() > 0.0);\n501\t\n502\t // End the rebalance and verify duration was recorded\n503\t let duration = {\n504\t let mut m = metrics.write().await;\n505\t m.end_rebalance()\n506\t };\n507\t assert!(duration > 0.0, \"duration should be positive\");\n508\t}\n509\t\n510\t/// P4.1-A4: Two workers running simultaneously produce 0 duplicate migrations.\n511\t///\n512\t/// This is a comprehensive integration test that simulates two pods\n513\t/// both running the rebalancer worker simultaneously and verifies that\n514\t/// only one actually processes topology change events (no duplicate migrations).\n515\t#[tokio::test]\n516\tasync fn p4_1_a4_two_workers_no_duplicate_migrations() {\n517\t use tokio::sync::mpsc;\n518\t use std::sync::atomic::{AtomicU32, Ordering};\n519\t\n520\t let topo = Arc::new(RwLock::new(test_topology()));\n521\t let task_store = Arc::new(MockTaskStore::new()) as Arc;\n522\t let config = RebalancerWorkerConfig {\n523\t lease_ttl_secs: 5,\n524\t lease_renewal_interval_ms: 100,\n525\t event_channel_capacity: 10,\n526\t ..Default::default()\n527\t };\n528\t let migration_config = MigrationConfig::default();\n529\t let coordinator = Arc::new(RwLock::new(MigrationCoordinator::new(migration_config)));\n530\t let metrics = Arc::new(RwLock::new(RebalancerMetrics::default()));\n531\t\n532\t // Counter to track how many times migrations were processed\n533\t let migrations_processed = Arc::new(AtomicU32::new(0));\n534\t\n535\t // Create two workers with different pod IDs\n536\t let worker1 = RebalancerWorker::new(\n537\t config.clone(),\n538\t topo.clone(),\n539\t task_store.clone(),\n540\t Arc::new(Rebalancer::new(\n541\t crate::rebalancer::RebalancerConfig::default(),\n542\t topo.clone(),\n543\t MigrationConfig::default(),\n544\t )),\n545\t coordinator.clone(),\n546\t metrics.clone(),\n547\t \"pod-1\".to_string(),\n548\t );\n549\t\n550\t let worker2 = RebalancerWorker::new(\n551\t config.clone(),\n552\t topo.clone(),\n553\t task_store.clone(),\n554\t Arc::new(Rebalancer::new(\n555\t crate::rebalancer::RebalancerConfig::default(),\n556\t topo.clone(),\n557\t MigrationConfig::default(),\n558\t )),\n559\t coordinator.clone(),\n560\t metrics.clone(),\n561\t \"pod-2\".to_string(),\n562\t );\n563\t\n564\t // Simulate pod-1 acquiring the lease first\n565\t let scope = \"rebalance:test-duplicate-index\";\n566\t let now = now_ms();\n567\t let expires_at = now + 5000; // 5 seconds from now\n568\t\n569\t let pod1_acquired = tokio::task::spawn_blocking({\n570\t let task_store = task_store.clone();\n571\t let scope = scope.to_string();\n572\t let holder = \"pod-1\".to_string();\n573\t move || {\n574\t task_store.try_acquire_leader_lease(&scope, &holder, expires_at, now)\n575\t }\n576\t })\n577\t .await\n578\t .unwrap()\n579\t .unwrap();\n580\t assert!(pod1_acquired, \"pod-1 should acquire the lease first\");\n581\t\n582\t // Pod-2 tries to acquire - should fail\n583\t let pod2_acquired = tokio::task::spawn_blocking({\n584\t let task_store = task_store.clone();\n585\t let scope = scope.to_string();\n586\t let holder = \"pod-2\".to_string();\n587\t move || {\n588\t task_store.try_acquire_leader_lease(&scope, &holder, expires_at, now)\n589\t }\n590\t })\n591\t .await\n592\t .unwrap()\n593\t .unwrap();\n594\t assert!(!pod2_acquired, \"pod-2 should not acquire lease while pod-1 holds it\");\n595\t\n596\t // Now simulate a scenario where both pods try to process the same topology event\n597\t // Only pod-1 (the lease holder) should actually process it\n598\t let event_tx_1 = worker1.event_sender();\n599\t let event_tx_2 = worker2.event_sender();\n600\t\n601\t // Send the same event through both workers\n602\t let event = TopologyChangeEvent::NodeAdded {\n603\t node_id: \"node-new\".to_string(),\n604\t replica_group: 0,\n605\t index_uid: \"test-duplicate-index\".to_string(),\n606\t };\n607\t\n608\t // Both workers receive the event\n609\t event_tx_1.send(event.clone()).await.unwrap();\n610\t event_tx_2.send(event).await.unwrap();\n611\t\n612\t // Give time for processing\n613\t tokio::time::sleep(tokio::time::Duration::from_millis(100)).await;\n614\t\n615\t // Verify that only one migration was created (not two duplicates)\n616\t let coordinator_read = coordinator.read().await;\n617\t let migration_count = coordinator_read.get_all_migrations().len();\n618\t assert_eq!(migration_count, 1, \"only one migration should be created, not duplicates\");\n619\t}\n620\t\n621\t/// Helper to get current time in milliseconds.\n622\tfn now_ms() -> i64 {\n623\t std::time::SystemTime::now()\n624\t .duration_since(std::time::UNIX_EPOCH)\n625\t .unwrap_or_default()\n626\t .as_millis() as i64\n627\t}\n628\t"}]},"parent_tool_use_id":null,"session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","uuid":"efea35c3-dd27-46e3-b8d6-65a105b5cc3a","timestamp":"2026-05-23T05:58:46.158Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/crates/miroir-core/src/rebalancer_worker/acceptance_tests.rs","content":"//! Acceptance tests for the rebalancer worker (P4.1).\n//!\n//! These tests verify the three key acceptance criteria:\n//! 1. Advisory lock: only one pod runs the rebalancer at a time\n//! 2. Progress persistence: pod restart resumes without starting over\n//! 3. Metrics tick: documents migrated counter monotonically increases\n\nuse super::*;\nuse crate::error::Result;\nuse crate::migration::{MigrationConfig, MigrationCoordinator};\nuse crate::task_store::{JobRow, LeaderLeaseRow, NewJob, TaskStore, NewCanary, CanaryRow, NewCdcCursor, CdcCursorRow, NewTenantMapping, TenantMapRow, NewRolloverPolicy, RolloverPolicyRow, NewSearchUiConfig, SearchUiConfigRow, NewAdminSession, AdminSessionRow};\nuse crate::topology::{Node, NodeId as TopologyNodeId, Topology};\nuse std::sync::Arc;\nuse tokio::sync::RwLock;\n\n/// Create a test topology with 4 nodes across 2 replica groups.\nfn test_topology() -> Topology {\n let mut topo = Topology::new(64, 2, 2);\n topo.add_node(Node::new(\n TopologyNodeId::new(\"node-0\".into()),\n \"http://node-0:7700\".into(),\n 0,\n ));\n topo.add_node(Node::new(\n TopologyNodeId::new(\"node-1\".into()),\n \"http://node-1:7700\".into(),\n 0,\n ));\n topo.add_node(Node::new(\n TopologyNodeId::new(\"node-2\".into()),\n \"http://node-2:7700\".into(),\n 1,\n ));\n topo.add_node(Node::new(\n TopologyNodeId::new(\"node-3\".into()),\n \"http://node-3:7700\".into(),\n 1,\n ));\n topo\n}\n\n/// Test helper: create an in-memory task store for testing.\nstruct MockTaskStore {\n jobs: Arc>>,\n leader_leases: Arc>>,\n}\n\nimpl MockTaskStore {\n fn new() -> Self {\n Self {\n jobs: Arc::new(std::sync::Mutex::new(Vec::new())),\n leader_leases: Arc::new(std::sync::Mutex::new(Vec::new())),\n }\n }\n}\n\nimpl TaskStore for MockTaskStore {\n fn migrate(&self) -> Result<()> {\n Ok(())\n }\n\n fn insert_job(&self, job: &NewJob) -> Result<()> {\n let mut jobs = self.jobs.lock().unwrap();\n jobs.push(JobRow {\n id: job.id.clone(),\n type_: job.type_.clone(),\n params: job.params.clone(),\n state: job.state.clone(),\n claimed_by: None,\n claim_expires_at: None,\n progress: job.progress.clone(),\n });\n Ok(())\n }\n\n fn get_job(&self, id: &str) -> Result> {\n let jobs = self.jobs.lock().unwrap();\n Ok(jobs.iter().find(|j| j.id == id).cloned())\n }\n\n fn update_job_progress(&self, _id: &str, _state: &str, _progress: &str) -> Result {\n Ok(true)\n }\n\n fn list_jobs_by_state(&self, _state: &str) -> Result> {\n let jobs = self.jobs.lock().unwrap();\n Ok(jobs.clone())\n }\n\n fn try_acquire_leader_lease(\n &self,\n scope: &str,\n holder: &str,\n expires_at: i64,\n now_ms: i64,\n ) -> Result {\n let mut leases = self.leader_leases.lock().unwrap();\n\n // Check if there's an existing unexpired lease\n for lease in leases.iter() {\n // Lease is still valid if expires_at >= now_ms (>= because we can acquire at exactly the expiration time)\n if lease.scope == scope && lease.expires_at >= now_ms {\n if lease.holder == holder {\n return Ok(true); // Already hold the lease\n }\n return Ok(false); // Someone else holds it\n }\n }\n\n // No existing unexpired lease - acquire it\n leases.retain(|l| l.scope != scope); // Remove any expired leases for this scope\n leases.push(LeaderLeaseRow {\n scope: scope.to_string(),\n holder: holder.to_string(),\n expires_at,\n });\n Ok(true)\n }\n\n fn renew_leader_lease(&self, scope: &str, holder: &str, expires_at: i64) -> Result {\n let mut leases = self.leader_leases.lock().unwrap();\n for lease in leases.iter_mut() {\n if lease.scope == scope && lease.holder == holder {\n lease.expires_at = expires_at;\n return Ok(true);\n }\n }\n Ok(false)\n }\n\n fn get_leader_lease(&self, scope: &str) -> Result> {\n let leases = self.leader_leases.lock().unwrap();\n Ok(leases.iter().find(|l| l.scope == scope).cloned())\n }\n\n // Stub implementations for unused trait methods\n fn insert_task(&self, _task: &crate::task_store::NewTask) -> Result<()> {\n Ok(())\n }\n fn get_task(&self, _miroir_id: &str) -> Result> {\n Ok(None)\n }\n fn update_task_status(&self, _miroir_id: &str, _status: &str) -> Result {\n Ok(false)\n }\n fn update_node_task(&self, _miroir_id: &str, _node_id: &str, _task_uid: u64) -> Result {\n Ok(false)\n }\n fn set_task_error(&self, _miroir_id: &str, _error: &str) -> Result {\n Ok(false)\n }\n fn list_tasks(&self, _filter: &crate::task_store::TaskFilter) -> Result> {\n Ok(Vec::new())\n }\n fn prune_tasks(&self, _cutoff_ms: i64, _batch_size: u32) -> Result {\n Ok(0)\n }\n fn task_count(&self) -> Result {\n Ok(0)\n }\n fn upsert_node_settings_version(\n &self,\n _index_uid: &str,\n _node_id: &str,\n _version: i64,\n _updated_at: i64,\n ) -> Result<()> {\n Ok(())\n }\n fn get_node_settings_version(\n &self,\n _index_uid: &str,\n _node_id: &str,\n ) -> Result> {\n Ok(None)\n }\n fn create_alias(&self, _alias: &crate::task_store::NewAlias) -> Result<()> {\n Ok(())\n }\n fn get_alias(&self, _name: &str) -> Result> {\n Ok(None)\n }\n fn flip_alias(&self, _name: &str, _new_uid: &str, _history_retention: usize) -> Result {\n Ok(false)\n }\n fn delete_alias(&self, _name: &str) -> Result {\n Ok(false)\n }\n fn list_aliases(&self) -> Result> {\n Ok(Vec::new())\n }\n fn upsert_session(&self, _session: &crate::task_store::SessionRow) -> Result<()> {\n Ok(())\n }\n fn get_session(&self, _session_id: &str) -> Result> {\n Ok(None)\n }\n fn delete_expired_sessions(&self, _now_ms: i64) -> Result {\n Ok(0)\n }\n fn insert_idempotency_entry(&self, _entry: &crate::task_store::IdempotencyEntry) -> Result<()> {\n Ok(())\n }\n fn get_idempotency_entry(&self, _key: &str) -> Result> {\n Ok(None)\n }\n fn delete_expired_idempotency_entries(&self, _now_ms: i64) -> Result {\n Ok(0)\n }\n fn claim_job(&self, _id: &str, _claimed_by: &str, _claim_expires_at: i64) -> Result {\n Ok(false)\n }\n fn renew_job_claim(&self, _id: &str, _claim_expires_at: i64) -> Result {\n Ok(false)\n }\n fn upsert_canary(&self, _canary: &crate::task_store::NewCanary) -> Result<()> {\n Ok(())\n }\n fn get_canary(&self, _id: &str) -> Result> {\n Ok(None)\n }\n fn list_canaries(&self) -> Result> {\n Ok(Vec::new())\n }\n fn delete_canary(&self, _id: &str) -> Result {\n Ok(false)\n }\n fn insert_canary_run(&self, _run: &crate::task_store::NewCanaryRun, _run_history_limit: usize) -> Result<()> {\n Ok(())\n }\n fn get_canary_runs(&self, _canary_id: &str, _limit: usize) -> Result> {\n Ok(Vec::new())\n }\n fn upsert_cdc_cursor(&self, _cursor: &crate::task_store::NewCdcCursor) -> Result<()> {\n Ok(())\n }\n fn get_cdc_cursor(&self, _sink_name: &str, _index_uid: &str) -> Result> {\n Ok(None)\n }\n fn list_cdc_cursors(&self, _sink_name: &str) -> Result> {\n Ok(Vec::new())\n }\n fn insert_tenant_mapping(&self, _mapping: &crate::task_store::NewTenantMapping) -> Result<()> {\n Ok(())\n }\n fn get_tenant_mapping(&self, _api_key_hash: &[u8]) -> Result> {\n Ok(None)\n }\n fn delete_tenant_mapping(&self, _api_key_hash: &[u8]) -> Result {\n Ok(false)\n }\n fn upsert_rollover_policy(&self, _policy: &crate::task_store::NewRolloverPolicy) -> Result<()> {\n Ok(())\n }\n fn get_rollover_policy(&self, _name: &str) -> Result> {\n Ok(None)\n }\n fn list_rollover_policies(&self) -> Result> {\n Ok(Vec::new())\n }\n fn delete_rollover_policy(&self, _name: &str) -> Result {\n Ok(false)\n }\n fn upsert_search_ui_config(&self, _config: &crate::task_store::NewSearchUiConfig) -> Result<()> {\n Ok(())\n }\n fn get_search_ui_config(&self, _index_uid: &str) -> Result> {\n Ok(None)\n }\n fn delete_search_ui_config(&self, _index_uid: &str) -> Result {\n Ok(false)\n }\n fn insert_admin_session(&self, _session: &crate::task_store::NewAdminSession) -> Result<()> {\n Ok(())\n }\n fn get_admin_session(&self, _session_id: &str) -> Result> {\n Ok(None)\n }\n fn revoke_admin_session(&self, _session_id: &str) -> Result {\n Ok(false)\n }\n fn delete_expired_admin_sessions(&self, _now_ms: i64) -> Result {\n Ok(0)\n }\n}\n\n/// P4.1-A1: Advisory lock ensures only one pod runs the rebalancer at a time.\n#[tokio::test]\nasync fn p4_1_a1_advisory_lock_prevents_duplicate_migrations() {\n let topo = Arc::new(RwLock::new(test_topology()));\n let task_store = Arc::new(MockTaskStore::new()) as Arc;\n let config = RebalancerWorkerConfig::default();\n let migration_config = MigrationConfig::default();\n let coordinator = Arc::new(RwLock::new(MigrationCoordinator::new(migration_config)));\n let metrics = Arc::new(RwLock::new(RebalancerMetrics::default()));\n\n // Create two workers simulating two different pods\n let worker1 = RebalancerWorker::new(\n config.clone(),\n topo.clone(),\n task_store.clone(),\n Arc::new(Rebalancer::new(\n crate::rebalancer::RebalancerConfig::default(),\n topo.clone(),\n MigrationConfig::default(),\n )),\n coordinator.clone(),\n metrics.clone(),\n \"pod-1\".to_string(),\n );\n\n let worker2 = RebalancerWorker::new(\n config.clone(),\n topo.clone(),\n task_store.clone(),\n Arc::new(Rebalancer::new(\n crate::rebalancer::RebalancerConfig::default(),\n topo.clone(),\n MigrationConfig::default(),\n )),\n coordinator.clone(),\n metrics.clone(),\n \"pod-2\".to_string(),\n );\n\n let scope = \"rebalance:test-index\";\n let now = now_ms();\n let expires_at = now + 10000; // 10 seconds from now\n\n // Pod 1 acquires the lease\n let acquired1 = tokio::task::spawn_blocking({\n let task_store = task_store.clone();\n let scope = scope.to_string();\n let holder = \"pod-1\".to_string();\n move || {\n task_store.try_acquire_leader_lease(&scope, &holder, expires_at, now)\n }\n })\n .await\n .unwrap()\n .unwrap();\n assert!(acquired1, \"pod-1 should acquire the lease\");\n\n // Pod 2 tries to acquire the same lease - should fail\n let acquired2 = tokio::task::spawn_blocking({\n let task_store = task_store.clone();\n let scope = scope.to_string();\n let holder = \"pod-2\".to_string();\n move || {\n task_store.try_acquire_leader_lease(&scope, &holder, expires_at, now)\n }\n })\n .await\n .unwrap()\n .unwrap();\n assert!(!acquired2, \"pod-2 should not acquire the lease while pod-1 holds it\");\n\n // Pod 1 can renew its lease\n let renewed1 = tokio::task::spawn_blocking({\n let task_store = task_store.clone();\n let scope = scope.to_string();\n let holder = \"pod-1\".to_string();\n move || {\n task_store.renew_leader_lease(&scope, &holder, expires_at + 2000)\n }\n })\n .await\n .unwrap()\n .unwrap();\n assert!(renewed1, \"pod-1 should renew its lease\");\n\n // Pod 2 still cannot acquire\n let acquired2_after = tokio::task::spawn_blocking({\n let task_store = task_store.clone();\n let scope = scope.to_string();\n let holder = \"pod-2\".to_string();\n move || {\n task_store.try_acquire_leader_lease(&scope, &holder, expires_at + 3000, expires_at + 2000)\n }\n })\n .await\n .unwrap()\n .unwrap();\n assert!(!acquired2_after, \"pod-2 should still not acquire after pod-1 renews\");\n}\n\n/// P4.1-A2: Progress persistence allows pod restart resumption.\n#[tokio::test]\nasync fn p4_1_a2_progress_persistence_pods_resume_migration() {\n let topo = Arc::new(RwLock::new(test_topology()));\n let task_store = Arc::new(MockTaskStore::new()) as Arc;\n let config = RebalancerWorkerConfig::default();\n let migration_config = MigrationConfig::default();\n let coordinator = Arc::new(RwLock::new(MigrationCoordinator::new(migration_config)));\n let metrics = Arc::new(RwLock::new(RebalancerMetrics::default()));\n\n // Create a job and persist it\n let job_id = RebalanceJobId::new(\"test-index\");\n let mut shard_states = HashMap::new();\n shard_states.insert(\n 10,\n ShardState {\n phase: ShardMigrationPhase::MigrationInProgress,\n docs_migrated: 5000,\n last_offset: 5000,\n source_node: Some(\"node-0\".to_string()),\n target_node: \"node-1\".to_string(),\n started_at: Instant::now(),\n },\n );\n\n let job = RebalanceJob {\n id: job_id.clone(),\n index_uid: \"test-index\".to_string(),\n replica_group: 0,\n shards: shard_states,\n started_at: Instant::now(),\n completed_at: None,\n total_docs_migrated: 5000,\n paused: false,\n };\n\n // Persist the job\n let progress = serde_json::to_string(&job).unwrap();\n let new_job = NewJob {\n id: job.id.0.clone(),\n type_: \"rebalance\".to_string(),\n params: progress,\n state: \"running\".to_string(),\n progress: \"{\\\"total_shards\\\":1,\\\"completed\\\":0,\\\"docs_migrated\\\":5000}\".to_string(),\n };\n tokio::task::spawn_blocking({\n let task_store = task_store.clone();\n let new_job = new_job.clone();\n move || {\n task_store.insert_job(&new_job)\n }\n })\n .await\n .unwrap()\n .unwrap();\n\n // Create a new worker (simulating a new pod)\n let worker2 = RebalancerWorker::new(\n config,\n topo,\n task_store.clone(),\n Arc::new(Rebalancer::new(\n crate::rebalancer::RebalancerConfig::default(),\n Arc::new(RwLock::new(test_topology())),\n MigrationConfig::default(),\n )),\n coordinator,\n metrics,\n \"pod-2\".to_string(),\n );\n\n // Load persisted jobs\n worker2.load_persisted_jobs().await.unwrap();\n\n // Verify the job was loaded\n let jobs = worker2.jobs.read().await;\n let loaded_job = jobs.get(&job_id).unwrap();\n assert_eq!(loaded_job.index_uid, \"test-index\");\n assert_eq!(loaded_job.total_docs_migrated, 5000);\n assert_eq!(loaded_job.shards.len(), 1);\n\n // Verify the shard state was preserved\n let shard_state = loaded_job.shards.get(&10).unwrap();\n assert_eq!(shard_state.docs_migrated, 5000);\n assert_eq!(shard_state.last_offset, 5000);\n assert!(matches!(\n shard_state.phase,\n ShardMigrationPhase::MigrationInProgress\n ));\n}\n\n/// P4.1-A3: Metrics tick - documents migrated counter monotonically increases.\n#[tokio::test]\nasync fn p4_1_a3_metrics_monotonically_increase() {\n let metrics = Arc::new(RwLock::new(RebalancerMetrics::default()));\n\n // Start a rebalance\n {\n let mut m = metrics.write().await;\n m.start_rebalance();\n }\n\n // Record some documents migrated\n {\n let mut m = metrics.write().await;\n m.record_documents_migrated(100);\n m.record_documents_migrated(200);\n m.record_documents_migrated(150);\n }\n\n // Verify the counter monotonically increased\n let m = metrics.read().await;\n assert_eq!(m.documents_migrated_total, 450);\n assert!(m.current_duration_secs() > 0.0);\n\n // End the rebalance and verify duration was recorded\n let duration = {\n let mut m = metrics.write().await;\n m.end_rebalance()\n };\n assert!(duration > 0.0, \"duration should be positive\");\n}\n\n/// P4.1-A4: Two workers running simultaneously produce 0 duplicate migrations.\n///\n/// This is a comprehensive integration test that simulates two pods\n/// both running the rebalancer worker simultaneously and verifies that\n/// only one actually processes topology change events (no duplicate migrations).\n#[tokio::test]\nasync fn p4_1_a4_two_workers_no_duplicate_migrations() {\n use tokio::sync::mpsc;\n use std::sync::atomic::{AtomicU32, Ordering};\n\n let topo = Arc::new(RwLock::new(test_topology()));\n let task_store = Arc::new(MockTaskStore::new()) as Arc;\n let config = RebalancerWorkerConfig {\n lease_ttl_secs: 5,\n lease_renewal_interval_ms: 100,\n event_channel_capacity: 10,\n ..Default::default()\n };\n let migration_config = MigrationConfig::default();\n let coordinator = Arc::new(RwLock::new(MigrationCoordinator::new(migration_config)));\n let metrics = Arc::new(RwLock::new(RebalancerMetrics::default()));\n\n // Counter to track how many times migrations were processed\n let migrations_processed = Arc::new(AtomicU32::new(0));\n\n // Create two workers with different pod IDs\n let worker1 = RebalancerWorker::new(\n config.clone(),\n topo.clone(),\n task_store.clone(),\n Arc::new(Rebalancer::new(\n crate::rebalancer::RebalancerConfig::default(),\n topo.clone(),\n MigrationConfig::default(),\n )),\n coordinator.clone(),\n metrics.clone(),\n \"pod-1\".to_string(),\n );\n\n let worker2 = RebalancerWorker::new(\n config.clone(),\n topo.clone(),\n task_store.clone(),\n Arc::new(Rebalancer::new(\n crate::rebalancer::RebalancerConfig::default(),\n topo.clone(),\n MigrationConfig::default(),\n )),\n coordinator.clone(),\n metrics.clone(),\n \"pod-2\".to_string(),\n );\n\n // Simulate pod-1 acquiring the lease first\n let scope = \"rebalance:test-duplicate-index\";\n let now = now_ms();\n let expires_at = now + 5000; // 5 seconds from now\n\n let pod1_acquired = tokio::task::spawn_blocking({\n let task_store = task_store.clone();\n let scope = scope.to_string();\n let holder = \"pod-1\".to_string();\n move || {\n task_store.try_acquire_leader_lease(&scope, &holder, expires_at, now)\n }\n })\n .await\n .unwrap()\n .unwrap();\n assert!(pod1_acquired, \"pod-1 should acquire the lease first\");\n\n // Pod-2 tries to acquire - should fail\n let pod2_acquired = tokio::task::spawn_blocking({\n let task_store = task_store.clone();\n let scope = scope.to_string();\n let holder = \"pod-2\".to_string();\n move || {\n task_store.try_acquire_leader_lease(&scope, &holder, expires_at, now)\n }\n })\n .await\n .unwrap()\n .unwrap();\n assert!(!pod2_acquired, \"pod-2 should not acquire lease while pod-1 holds it\");\n\n // Now simulate a scenario where both pods try to process the same topology event\n // Only pod-1 (the lease holder) should actually process it\n let event_tx_1 = worker1.event_sender();\n let event_tx_2 = worker2.event_sender();\n\n // Send the same event through both workers\n let event = TopologyChangeEvent::NodeAdded {\n node_id: \"node-new\".to_string(),\n replica_group: 0,\n index_uid: \"test-duplicate-index\".to_string(),\n };\n\n // Both workers receive the event\n event_tx_1.send(event.clone()).await.unwrap();\n event_tx_2.send(event).await.unwrap();\n\n // Give time for processing\n tokio::time::sleep(tokio::time::Duration::from_millis(100)).await;\n\n // Verify that only one migration was created (not two duplicates)\n let coordinator_read = coordinator.read().await;\n let migration_count = coordinator_read.get_all_migrations().len();\n assert_eq!(migration_count, 1, \"only one migration should be created, not duplicates\");\n}\n\n/// Helper to get current time in milliseconds.\nfn now_ms() -> i64 {\n std::time::SystemTime::now()\n .duration_since(std::time::UNIX_EPOCH)\n .unwrap_or_default()\n .as_millis() as i64\n}\n","numLines":628,"startLine":1,"totalLines":628}}} -{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_c0d8869d747d4cf9aeb20b02","type":"tool_result","content":"1\t//! Cluster rebalancer for elastic topology operations.\n2\t//!\n3\t//! Implements plan §2 topology changes and §4 rebalancer:\n4\t//! - Node addition (within a group)\n5\t//! - Replica-group addition\n6\t//! - Node removal (drain)\n7\t//! - Group removal\n8\t//! - Unplanned node failure handling\n9\t//!\n10\t//! The rebalancer coordinates shard migrations using the migration coordinator\n11\t//! and provides admin API endpoints for topology operations.\n12\t\n13\tuse crate::migration::{MigrationCoordinator, MigrationId, MigrationConfig, MigrationError, NodeId as MigrationNodeId, ShardId};\n14\tuse crate::task_store::TaskStore;\n15\tuse crate::topology::{Node, NodeId as TopologyNodeId, NodeStatus, Topology};\n16\tuse crate::router::{assign_shard_in_group, score};\n17\tuse serde::{Deserialize, Serialize};\n18\tuse std::collections::HashMap;\n19\tuse std::sync::Arc;\n20\tuse std::time::{Duration, Instant};\n21\tuse tokio::sync::RwLock;\n22\tuse tracing::{debug, error, info, instrument, warn};\n23\t\n24\t/// Callback type for recording rebalancer metrics.\n25\tpub type RebalancerMetricsCallback = Arc;\n26\t\n27\t/// Convert a topology NodeId to a migration NodeId.\n28\tfn topo_to_migration_node_id(id: &TopologyNodeId) -> MigrationNodeId {\n29\t MigrationNodeId(id.as_str().to_string())\n30\t}\n31\t\n32\t/// Convert a migration NodeId to a topology NodeId.\n33\tfn migration_to_topo_node_id(id: &MigrationNodeId) -> TopologyNodeId {\n34\t TopologyNodeId::new(id.0.clone())\n35\t}\n36\t\n37\t/// Configuration for the rebalancer.\n38\t#[derive(Debug, Clone, Serialize, Deserialize)]\n39\tpub struct RebalancerConfig {\n40\t /// Maximum concurrent shard migrations.\n41\t pub max_concurrent_migrations: u32,\n42\t /// Timeout for a single migration operation.\n43\t pub migration_timeout_s: u64,\n44\t /// Whether to automatically rebalance on node recovery.\n45\t pub auto_rebalance_on_recovery: bool,\n46\t /// Batch size for document migration.\n47\t pub migration_batch_size: u32,\n48\t /// Delay between migration batches (ms).\n49\t pub migration_batch_delay_ms: u64,\n50\t}\n51\t\n52\timpl Default for RebalancerConfig {\n53\t fn default() -> Self {\n54\t Self {\n55\t max_concurrent_migrations: 4,\n56\t migration_timeout_s: 3600,\n57\t auto_rebalance_on_recovery: true,\n58\t migration_batch_size: 1000,\n59\t migration_batch_delay_ms: 100,\n60\t }\n61\t }\n62\t}\n63\t\n64\t/// Type of topology operation.\n65\t#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]\n66\t#[serde(rename_all = \"snake_case\")]\n67\tpub enum TopologyOperationType {\n68\t /// Adding a new node to an existing replica group.\n69\t AddNode,\n70\t /// Removing a node from a replica group.\n71\t RemoveNode,\n72\t /// Draining a node before removal.\n73\t DrainNode,\n74\t /// Adding a new replica group.\n75\t AddReplicaGroup,\n76\t /// Removing an entire replica group.\n77\t RemoveReplicaGroup,\n78\t /// Handling a failed node.\n79\t NodeFailure,\n80\t}\n81\t\n82\t/// Status of a topology operation.\n83\t#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]\n84\t#[serde(rename_all = \"snake_case\")]\n85\tpub enum TopologyOperationStatus {\n86\t /// Operation is pending.\n87\t Pending,\n88\t /// Operation is in progress.\n89\t InProgress,\n90\t /// Operation completed successfully.\n91\t Complete,\n92\t /// Operation failed.\n93\t Failed,\n94\t /// Operation was cancelled.\n95\t Cancelled,\n96\t}\n97\t\n98\t/// A topology operation (node/group add/remove/drain).\n99\t#[derive(Debug, Clone, Serialize, Deserialize)]\n100\tpub struct TopologyOperation {\n101\t /// Unique operation ID.\n102\t pub id: u64,\n103\t /// Type of operation.\n104\t pub op_type: TopologyOperationType,\n105\t /// Current status.\n106\t pub status: TopologyOperationStatus,\n107\t /// Target node ID (for node operations).\n108\t pub target_node: Option,\n109\t /// Target replica group ID (for group operations).\n110\t pub target_group: Option,\n111\t /// Shard migrations in progress for this operation.\n112\t pub migrations: Vec,\n113\t /// Start time.\n114\t pub started_at: Option,\n115\t /// Completion time.\n116\t pub completed_at: Option,\n117\t /// Error message if failed.\n118\t pub error: Option,\n119\t}\n120\t\n121\t/// Result of a topology operation request.\n122\t#[derive(Debug, Clone, Serialize, Deserialize)]\n123\tpub struct TopologyOperationResult {\n124\t /// Operation ID.\n125\t pub id: u64,\n126\t /// Status message.\n127\t pub message: String,\n128\t /// Number of shard migrations initiated.\n129\t pub migrations_count: usize,\n130\t}\n131\t\n132\t/// Status of all ongoing topology operations.\n133\t#[derive(Debug, Clone, Serialize, Deserialize)]\n134\tpub struct RebalanceStatus {\n135\t /// Whether a rebalance is currently in progress.\n136\t pub in_progress: bool,\n137\t /// Active topology operations.\n138\t pub operations: Vec,\n139\t /// Active migration details.\n140\t pub migrations: HashMap,\n141\t}\n142\t\n143\t/// Status of a single migration.\n144\t#[derive(Debug, Clone, Serialize, Deserialize)]\n145\tpub struct MigrationStatus {\n146\t /// Migration ID.\n147\t pub id: u64,\n148\t /// New node ID.\n149\t pub new_node: String,\n150\t /// Replica group.\n151\t pub replica_group: u32,\n152\t /// Current phase.\n153\t pub phase: String,\n154\t /// Affected shards count.\n155\t pub shards_count: usize,\n156\t /// Completed shards count.\n157\t pub completed_count: usize,\n158\t}\n159\t\n160\t/// Request to add a node to a replica group.\n161\t#[derive(Debug, Clone, Deserialize)]\n162\tpub struct AddNodeRequest {\n163\t /// Node ID.\n164\t pub id: String,\n165\t /// Node address.\n166\t pub address: String,\n167\t /// Replica group to join.\n168\t pub replica_group: u32,\n169\t}\n170\t\n171\t/// Request to remove a node from the cluster.\n172\t#[derive(Debug, Clone, Deserialize)]\n173\tpub struct RemoveNodeRequest {\n174\t /// Node ID to remove.\n175\t pub node_id: String,\n176\t /// Force removal without draining (dangerous).\n177\t pub force: bool,\n178\t}\n179\t\n180\t/// Request to drain a node (prepare for removal).\n181\t#[derive(Debug, Clone, Deserialize)]\n182\tpub struct DrainNodeRequest {\n183\t /// Node ID to drain.\n184\t pub node_id: String,\n185\t}\n186\t\n187\t/// Request to add a replica group.\n188\t#[derive(Debug, Clone, Deserialize)]\n189\tpub struct AddReplicaGroupRequest {\n190\t /// Group ID.\n191\t pub group_id: u32,\n192\t /// Initial nodes in the group.\n193\t pub nodes: Vec,\n194\t}\n195\t\n196\t/// Node specification for group addition.\n197\t#[derive(Debug, Clone, Deserialize)]\n198\tpub struct GroupNodeSpec {\n199\t /// Node ID.\n200\t pub id: String,\n201\t /// Node address.\n202\t pub address: String,\n203\t}\n204\t\n205\t/// Request to remove a replica group.\n206\t#[derive(Debug, Clone, Deserialize)]\n207\tpub struct RemoveReplicaGroupRequest {\n208\t /// Group ID to remove.\n209\t pub group_id: u32,\n210\t /// Force removal without draining.\n211\t pub force: bool,\n212\t}\n213\t\n214\t/// Rebalancer error types.\n215\t#[derive(Debug, thiserror::Error)]\n216\tpub enum RebalancerError {\n217\t #[error(\"node not found: {0}\")]\n218\t NodeNotFound(String),\n219\t\n220\t #[error(\"replica group not found: {0}\")]\n221\t GroupNotFound(u32),\n222\t\n223\t #[error(\"operation already in progress for node: {0}\")]\n224\t OperationInProgress(String),\n225\t\n226\t #[error(\"invalid topology state: {0}\")]\n227\t InvalidState(String),\n228\t\n229\t #[error(\"migration error: {0}\")]\n230\t MigrationError(#[from] MigrationError),\n231\t\n232\t #[error(\"timeout: {0}\")]\n233\t Timeout(String),\n234\t\n235\t #[error(\"cannot remove last node in group\")]\n236\t CannotRemoveLastNode,\n237\t\n238\t #[error(\"replica group {0} is not empty\")]\n239\t GroupNotEmpty(u32),\n240\t}\n241\t\n242\t/// Migration executor: performs the actual document migration between nodes.\n243\t///\n244\t/// This trait allows the rebalancer core to remain agnostic to the HTTP client\n245\t/// implementation while still performing actual migrations.\n246\t#[async_trait::async_trait]\n247\tpub trait MigrationExecutor: Send + Sync {\n248\t /// Fetch documents from a source node for a specific shard.\n249\t async fn fetch_documents(\n250\t &self,\n251\t source_node: &str,\n252\t source_address: &str,\n253\t index_uid: &str,\n254\t shard_id: u32,\n255\t limit: u32,\n256\t offset: u32,\n257\t ) -> std::result::Result<(Vec, u64), String>;\n258\t\n259\t /// Write documents to a target node.\n260\t async fn write_documents(\n261\t &self,\n262\t target_node: &str,\n263\t target_address: &str,\n264\t index_uid: &str,\n265\t documents: Vec,\n266\t ) -> std::result::Result<(), String>;\n267\t\n268\t /// Delete documents from a node by shard filter.\n269\t async fn delete_shard(\n270\t &self,\n271\t node: &str,\n272\t node_address: &str,\n273\t index_uid: &str,\n274\t shard_id: u32,\n275\t ) -> std::result::Result<(), String>;\n276\t}\n277\t\n278\t/// Rebalancer metrics for Prometheus emission.\n279\t#[derive(Debug, Clone, Default)]\n280\tpub struct RebalancerMetrics {\n281\t /// Total number of documents migrated.\n282\t pub documents_migrated_total: u64,\n283\t /// Number of currently active migrations.\n284\t pub active_migrations: u64,\n285\t /// Start time of the current rebalance operation.\n286\t pub rebalance_start_time: Option,\n287\t}\n288\t\n289\timpl RebalancerMetrics {\n290\t /// Record that documents were migrated.\n291\t pub fn record_documents_migrated(&mut self, count: u64) {\n292\t self.documents_migrated_total += count;\n293\t }\n294\t\n295\t /// Increment active migrations count.\n296\t pub fn increment_active_migrations(&mut self) {\n297\t self.active_migrations += 1;\n298\t }\n299\t\n300\t /// Decrement active migrations count.\n301\t pub fn decrement_active_migrations(&mut self) {\n302\t self.active_migrations = self.active_migrations.saturating_sub(1);\n303\t }\n304\t\n305\t /// Start a rebalance operation.\n306\t pub fn start_rebalance(&mut self) {\n307\t self.rebalance_start_time = Some(Instant::now());\n308\t }\n309\t\n310\t /// End a rebalance operation and return duration in seconds.\n311\t pub fn end_rebalance(&mut self) -> f64 {\n312\t self.rebalance_start_time\n313\t .take()\n314\t .map(|t| t.elapsed().as_secs_f64())\n315\t .unwrap_or(0.0)\n316\t }\n317\t\n318\t /// Get the current rebalance duration in seconds.\n319\t pub fn current_duration_secs(&self) -> f64 {\n320\t self.rebalance_start_time\n321\t .map(|t| t.elapsed().as_secs_f64())\n322\t .unwrap_or(0.0)\n323\t }\n324\t}\n325\t\n326\t/// The cluster rebalancer orchestrates topology changes.\n327\tpub struct Rebalancer {\n328\t config: RebalancerConfig,\n329\t topology: Arc>,\n330\t migration_coordinator: Arc>,\n331\t operations: Arc>>,\n332\t next_op_id: Arc,\n333\t active_migrations: Arc>>, // migration -> operation ID\n334\t migration_executor: Option>,\n335\t /// Metrics for rebalancer operations.\n336\t pub metrics: Arc>,\n337\t /// Task store for leader lease (P4.1 background worker).\n338\t task_store: Option>,\n339\t /// This pod's ID for leader election.\n340\t pod_id: Option,\n341\t /// Leader lease scope prefix.\n342\t leader_scope: String,\n343\t /// Callback for recording Prometheus metrics.\n344\t metrics_callback: Option,\n345\t}\n346\t\n347\timpl Rebalancer {\n348\t /// Create a new rebalancer.\n349\t pub fn new(\n350\t config: RebalancerConfig,\n351\t topology: Arc>,\n352\t migration_config: MigrationConfig,\n353\t ) -> Self {\n354\t let coordinator = Arc::new(RwLock::new(MigrationCoordinator::new(migration_config)));\n355\t\n356\t Self {\n357\t config,\n358\t topology,\n359\t migration_coordinator: coordinator,\n360\t operations: Arc::new(RwLock::new(HashMap::new())),\n361\t next_op_id: Arc::new(std::sync::atomic::AtomicU64::new(1)),\n362\t active_migrations: Arc::new(RwLock::new(HashMap::new())),\n363\t migration_executor: None,\n364\t metrics: Arc::new(RwLock::new(RebalancerMetrics::default())),\n365\t task_store: None,\n366\t pod_id: None,\n367\t leader_scope: \"rebalance:global\".to_string(),\n368\t metrics_callback: None,\n369\t }\n370\t }\n371\t\n372\t /// Set the task store for leader lease (P4.1 background worker).\n373\t pub fn with_task_store(mut self, task_store: Arc) -> Self {\n374\t self.task_store = Some(task_store);\n375\t self\n376\t }\n377\t\n378\t /// Set the pod ID for leader election.\n379\t pub fn with_pod_id(mut self, pod_id: String) -> Self {\n380\t self.pod_id = Some(pod_id);\n381\t self\n382\t }\n383\t\n384\t /// Set the leader lease scope.\n385\t pub fn with_leader_scope(mut self, scope: String) -> Self {\n386\t self.leader_scope = scope;\n387\t self\n388\t }\n389\t\n390\t /// Set the metrics callback for Prometheus emission.\n391\t pub fn with_metrics_callback(mut self, callback: RebalancerMetricsCallback) -> Self {\n392\t self.metrics_callback = Some(callback);\n393\t self\n394\t }\n395\t\n396\t /// Set the migration executor (provides HTTP client for actual migrations).\n397\t pub fn with_migration_executor(mut self, executor: Arc) -> Self {\n398\t self.migration_executor = Some(executor);\n399\t self\n400\t }\n401\t\n402\t /// Emit a metric via the metrics callback (if configured).\n403\t fn emit_metric(&self, name: &str, value: f64) {\n404\t if let Some(ref callback) = self.metrics_callback {\n405\t callback(name, value);\n406\t }\n407\t }\n408\t\n409\t /// Run the background rebalancer worker (P4.1).\n410\t ///\n411\t /// This method runs in a loop, periodically checking for topology changes\n412\t /// and triggering rebalancing as needed. Uses leader lease to ensure only\n413\t /// one pod runs the rebalancer at a time.\n414\t #[instrument(skip_all, fields(pod_id = ?self.pod_id))]\n415\t pub async fn run_background(&self) -> Result<(), RebalancerError> {\n416\t let Some(ref task_store) = self.task_store else {\n417\t return Err(RebalancerError::InvalidState(\n418\t \"task_store required for background worker\".into(),\n419\t ));\n420\t };\n421\t\n422\t let Some(ref pod_id) = self.pod_id else {\n423\t return Err(RebalancerError::InvalidState(\n424\t \"pod_id required for background worker\".into(),\n425\t ));\n426\t };\n427\t\n428\t let check_interval = Duration::from_millis(5000); // Check every 5 seconds\n429\t let mut interval = tokio::time::interval(check_interval);\n430\t let mut leader_lease_interval = tokio::time::interval(Duration::from_secs(3));\n431\t\n432\t info!(\n433\t config = ?self.config,\n434\t \"rebalancer background worker started\"\n435\t );\n436\t\n437\t loop {\n438\t tokio::select! {\n439\t _ = interval.tick() => {\n440\t if self.is_leader(task_store, pod_id).await {\n441\t if let Err(e) = self.check_and_rebalance().await {\n442\t error!(error = %e, \"background rebalance check failed\");\n443\t }\n444\t }\n445\t }\n446\t _ = leader_lease_interval.tick() => {\n447\t if self.is_leader(task_store, pod_id).await {\n448\t self.renew_leader_lease(task_store, pod_id).await;\n449\t }\n450\t }\n451\t }\n452\t }\n453\t }\n454\t\n455\t /// Check if this pod is the leader for rebalancing.\n456\t async fn is_leader(&self, task_store: &Arc, pod_id: &str) -> bool {\n457\t let now = now_ms() as i64;\n458\t let lease_ttl = now + 15000; // 15 second TTL\n459\t\n460\t task_store\n461\t .try_acquire_leader_lease(&self.leader_scope, pod_id, lease_ttl, now)\n462\t .unwrap_or(false)\n463\t }\n464\t\n465\t /// Renew the leader lease.\n466\t async fn renew_leader_lease(&self, task_store: &Arc, pod_id: &str) {\n467\t let now = now_ms() as i64;\n468\t let lease_ttl = now + 15000; // 15 second TTL\n469\t\n470\t let _ = task_store\n471\t .renew_leader_lease(&self.leader_scope, pod_id, lease_ttl);\n472\t }\n473\t\n474\t /// Check for topology changes and trigger rebalancing if needed.\n475\t async fn check_and_rebalance(&self) -> Result<(), RebalancerError> {\n476\t debug!(\"checking for topology changes\");\n477\t\n478\t let topology = self.topology.read().await;\n479\t\n480\t // Check for nodes in Joining state\n481\t let joining_nodes: Vec<_> = topology\n482\t .nodes()\n483\t .filter(|n| n.status == NodeStatus::Joining)\n484\t .map(|n| (n.id.clone(), n.replica_group, n.address.clone()))\n485\t .collect();\n486\t\n487\t // Check for nodes in Draining state\n488\t let draining_nodes: Vec<_> = topology\n489\t .nodes()\n490\t .filter(|n| n.status == NodeStatus::Draining)\n491\t .map(|n| (n.id.clone(), n.replica_group))\n492\t .collect();\n493\t\n494\t // Check for nodes in Failed state\n495\t let failed_nodes: Vec<_> = topology\n496\t .nodes()\n497\t .filter(|n| n.status == NodeStatus::Failed)\n498\t .map(|n| (n.id.clone(), n.replica_group))\n499\t .collect();\n500\t\n501\t // Drop topology read lock before starting operations\n502\t drop(topology);\n503\t\n504\t // Trigger rebalance for joining nodes\n505\t for (node_id, replica_group, address) in joining_nodes {\n506\t info!(node_id = %node_id, replica_group, \"detected joining node\");\n507\t\n508\t // Check if there's already an operation in progress for this node\n509\t let ops = self.operations.read().await;\n510\t let already_in_progress = ops.values().any(|o| {\n511\t o.target_node.as_ref() == Some(&node_id.as_str().to_string())\n512\t && o.status == TopologyOperationStatus::InProgress\n513\t });\n514\t drop(ops);\n515\t\n516\t if !already_in_progress {\n517\t let request = AddNodeRequest {\n518\t id: node_id.as_str().to_string(),\n519\t address,\n520\t replica_group,\n521\t };\n522\t if let Err(e) = self.add_node(request).await {\n523\t warn!(error = %e, \"failed to start rebalance for joining node\");\n524\t }\n525\t }\n526\t }\n527\t\n528\t // Trigger rebalance for draining nodes\n529\t for (node_id, replica_group) in draining_nodes {\n530\t info!(node_id = %node_id, replica_group, \"detected draining node\");\n531\t\n532\t let ops = self.operations.read().await;\n533\t let already_in_progress = ops.values().any(|o| {\n534\t o.target_node.as_ref() == Some(&node_id.as_str().to_string())\n535\t && matches!(\n536\t o.op_type,\n537\t TopologyOperationType::DrainNode | TopologyOperationType::RemoveNode\n538\t )\n539\t && o.status == TopologyOperationStatus::InProgress\n540\t });\n541\t drop(ops);\n542\t\n543\t if !already_in_progress {\n544\t let request = DrainNodeRequest {\n545\t node_id: node_id.as_str().to_string(),\n546\t };\n547\t if let Err(e) = self.drain_node(request).await {\n548\t warn!(error = %e, \"failed to start rebalance for draining node\");\n549\t }\n550\t }\n551\t }\n552\t\n553\t // Handle failed nodes\n554\t for (node_id, replica_group) in failed_nodes {\n555\t info!(node_id = %node_id, replica_group, \"detected failed node\");\n556\t\n557\t let ops = self.operations.read().await;\n558\t let already_handled = ops.values().any(|o| {\n559\t o.target_node.as_ref() == Some(&node_id.as_str().to_string())\n560\t && o.op_type == TopologyOperationType::NodeFailure\n561\t });\n562\t drop(ops);\n563\t\n564\t if !already_handled {\n565\t if let Err(e) = self.handle_node_failure(node_id.as_str()).await {\n566\t warn!(error = %e, \"failed to handle node failure\");\n567\t }\n568\t }\n569\t }\n570\t\n571\t Ok(())\n572\t }\n573\t\n574\t /// Get current rebalance status.\n575\t pub async fn status(&self) -> RebalanceStatus {\n576\t let ops = self.operations.read().await;\n577\t let coordinator = self.migration_coordinator.read().await;\n578\t\n579\t let in_progress = ops.values().any(|o| o.status == TopologyOperationStatus::InProgress);\n580\t\n581\t let mut migrations: HashMap = HashMap::new();\n582\t for op in ops.values() {\n583\t for &mid in &op.migrations {\n584\t if let Some(state) = coordinator.get_state(mid) {\n585\t let key = format!(\"{}\", mid);\n586\t let status = MigrationStatus {\n587\t id: mid.0,\n588\t new_node: state.new_node.to_string(),\n589\t replica_group: state.replica_group,\n590\t phase: state.phase.to_string(),\n591\t shards_count: state.affected_shards.len(),\n592\t completed_count: state\n593\t .affected_shards\n594\t .values()\n595\t .filter(|s| matches!(s, crate::migration::ShardMigrationState::Active))\n596\t .count(),\n597\t };\n598\t migrations.insert(key, status);\n599\t }\n600\t }\n601\t }\n602\t\n603\t RebalanceStatus {\n604\t in_progress,\n605\t operations: ops.values().cloned().collect(),\n606\t migrations,\n607\t }\n608\t }\n609\t\n610\t /// Add a node to a replica group.\n611\t pub async fn add_node(\n612\t &self,\n613\t request: AddNodeRequest,\n614\t ) -> Result {\n615\t info!(\n616\t node_id = %request.id,\n617\t group = request.replica_group,\n618\t \"starting node addition\"\n619\t );\n620\t\n621\t // Check if node already exists\n622\t {\n623\t let topo = self.topology.read().await;\n624\t if topo.node(&TopologyNodeId::new(request.id.clone())).is_some() {\n625\t return Err(RebalancerError::InvalidState(format!(\n626\t \"node {} already exists\",\n627\t request.id\n628\t )));\n629\t }\n630\t }\n631\t\n632\t // Create operation record\n633\t let op_id = self.next_op_id.fetch_add(1, std::sync::atomic::Ordering::SeqCst);\n634\t\n635\t // Add node to topology in Joining state\n636\t {\n637\t let mut topo = self.topology.write().await;\n638\t let group_count = topo.groups().count() as u32;\n639\t if request.replica_group >= group_count {\n640\t return Err(RebalancerError::GroupNotFound(request.replica_group));\n641\t }\n642\t\n643\t let node = Node::new(\n644\t TopologyNodeId::new(request.id.clone()),\n645\t request.address.clone(),\n646\t request.replica_group,\n647\t );\n648\t topo.add_node(node);\n649\t }\n650\t\n651\t // Compute affected shards (shards that will move to new node)\n652\t let affected_shards = self.compute_shard_moves_for_new_node(&request.id, request.replica_group).await?;\n653\t\n654\t // Create migration for each affected shard\n655\t let mut migrations = Vec::new();\n656\t {\n657\t let mut coordinator = self.migration_coordinator.write().await;\n658\t\n659\t for (shard, old_owner) in affected_shards {\n660\t let mut old_owners = HashMap::new();\n661\t old_owners.insert(shard, topo_to_migration_node_id(&old_owner));\n662\t\n663\t let mid = coordinator.begin_migration(\n664\t topo_to_migration_node_id(&TopologyNodeId::new(request.id.clone())),\n665\t request.replica_group,\n666\t old_owners,\n667\t )?;\n668\t\n669\t // Start dual-write\n670\t coordinator.begin_dual_write(mid)?;\n671\t\n672\t // Track migration\n673\t {\n674\t let mut active = self.active_migrations.write().await;\n675\t active.insert(mid, op_id);\n676\t }\n677\t\n678\t migrations.push(mid);\n679\t }\n680\t }\n681\t\n682\t // Record operation\n683\t let node_id_for_result = request.id.clone();\n684\t let migrations_count = migrations.len();\n685\t let operation = TopologyOperation {\n686\t id: op_id,\n687\t op_type: TopologyOperationType::AddNode,\n688\t status: TopologyOperationStatus::InProgress,\n689\t target_node: Some(request.id),\n690\t target_group: Some(request.replica_group),\n691\t migrations: migrations.clone(),\n692\t started_at: Some(now_ms()),\n693\t completed_at: None,\n694\t error: None,\n695\t };\n696\t\n697\t {\n698\t let mut ops = self.operations.write().await;\n699\t ops.insert(op_id, operation);\n700\t }\n701\t\n702\t // Start metrics tracking\n703\t {\n704\t let mut metrics = self.metrics.write().await;\n705\t metrics.start_rebalance();\n706\t }\n707\t\n708\t // Start background migration task\n709\t let topo_arc = self.topology.clone();\n710\t let coord_arc = self.migration_coordinator.clone();\n711\t let ops_arc = self.operations.clone();\n712\t let active_arc = self.active_migrations.clone();\n713\t let config = self.config.clone();\n714\t let executor = self.migration_executor.clone();\n715\t let metrics_arc = self.metrics.clone();\n716\t\n717\t tokio::spawn(async move {\n718\t if let Err(e) = run_migration_task(\n719\t topo_arc,\n720\t coord_arc,\n721\t ops_arc,\n722\t active_arc,\n723\t op_id,\n724\t migrations,\n725\t config,\n726\t executor,\n727\t metrics_arc,\n728\t )\n729\t .await\n730\t {\n731\t error!(error = %e, op_id = op_id, \"migration task failed\");\n732\t }\n733\t });\n734\t\n735\t Ok(TopologyOperationResult {\n736\t id: op_id,\n737\t message: format!(\n738\t \"Node {} addition started with {} shard migrations\",\n739\t node_id_for_result,\n740\t migrations_count\n741\t ),\n742\t migrations_count,\n743\t })\n744\t }\n745\t\n746\t /// Drain a node (prepare for removal).\n747\t pub async fn drain_node(\n748\t &self,\n749\t request: DrainNodeRequest,\n750\t ) -> Result {\n751\t info!(node_id = %request.node_id, \"starting node drain\");\n752\t\n753\t // Check if node exists\n754\t let node_id = TopologyNodeId::new(request.node_id.clone());\n755\t let (node_status, replica_group) = {\n756\t let topo = self.topology.read().await;\n757\t let node = topo.node(&node_id).ok_or_else(|| {\n758\t RebalancerError::NodeNotFound(request.node_id.clone())\n759\t })?;\n760\t\n761\t // Check if this is the last node in the group\n762\t let group = topo\n763\t .groups()\n764\t .find(|g| g.id == node.replica_group)\n765\t .ok_or_else(|| RebalancerError::GroupNotFound(node.replica_group))?;\n766\t\n767\t if group.nodes().len() <= 1 {\n768\t return Err(RebalancerError::CannotRemoveLastNode);\n769\t }\n770\t\n771\t (node.status, node.replica_group)\n772\t };\n773\t\n774\t if node_status == NodeStatus::Draining {\n775\t return Err(RebalancerError::OperationInProgress(\n776\t request.node_id.clone(),\n777\t ));\n778\t }\n779\t\n780\t // Create operation record\n781\t let op_id = self.next_op_id.fetch_add(1, std::sync::atomic::Ordering::SeqCst);\n782\t\n783\t // Mark node as draining\n784\t {\n785\t let mut topo = self.topology.write().await;\n786\t if let Some(node) = topo.node_mut(&node_id) {\n787\t node.status = NodeStatus::Draining;\n788\t }\n789\t }\n790\t\n791\t // Compute shard destinations (where each shard goes)\n792\t let shard_destinations = self.compute_shard_destinations_for_drain(&request.node_id, replica_group).await?;\n793\t\n794\t // Create migrations for each shard\n795\t let mut migrations = Vec::new();\n796\t {\n797\t let mut coordinator = self.migration_coordinator.write().await;\n798\t\n799\t for (shard, dest_node) in shard_destinations {\n800\t let mid = coordinator.begin_migration(\n801\t topo_to_migration_node_id(&dest_node),\n802\t replica_group,\n803\t [(shard, topo_to_migration_node_id(&node_id))].into_iter().collect(),\n804\t )?;\n805\t\n806\t coordinator.begin_dual_write(mid)?;\n807\t\n808\t {\n809\t let mut active = self.active_migrations.write().await;\n810\t active.insert(mid, op_id);\n811\t }\n812\t\n813\t migrations.push(mid);\n814\t }\n815\t }\n816\t\n817\t // Record operation\n818\t let operation = TopologyOperation {\n819\t id: op_id,\n820\t op_type: TopologyOperationType::DrainNode,\n821\t status: TopologyOperationStatus::InProgress,\n822\t target_node: Some(request.node_id.clone()),\n823\t target_group: Some(replica_group),\n824\t migrations: migrations.clone(),\n825\t started_at: Some(now_ms()),\n826\t completed_at: None,\n827\t error: None,\n828\t };\n829\t\n830\t {\n831\t let mut ops = self.operations.write().await;\n832\t ops.insert(op_id, operation);\n833\t }\n834\t\n835\t // Start metrics tracking\n836\t {\n837\t let mut metrics = self.metrics.write().await;\n838\t metrics.start_rebalance();\n839\t }\n840\t\n841\t // Start background migration task\n842\t let migrations_count = migrations.len();\n843\t let topo_arc = self.topology.clone();\n844\t let coord_arc = self.migration_coordinator.clone();\n845\t let ops_arc = self.operations.clone();\n846\t let active_arc = self.active_migrations.clone();\n847\t let config = self.config.clone();\n848\t let drain_node_id = request.node_id.clone();\n849\t let executor = self.migration_executor.clone();\n850\t let metrics_arc = self.metrics.clone();\n851\t\n852\t tokio::spawn(async move {\n853\t if let Err(e) = run_drain_task(\n854\t topo_arc,\n855\t coord_arc,\n856\t ops_arc,\n857\t active_arc,\n858\t op_id,\n859\t migrations,\n860\t config,\n861\t drain_node_id,\n862\t executor,\n863\t metrics_arc,\n864\t )\n865\t .await\n866\t {\n867\t error!(error = %e, op_id = op_id, \"drain task failed\");\n868\t }\n869\t });\n870\t\n871\t Ok(TopologyOperationResult {\n872\t id: op_id,\n873\t message: format!(\n874\t \"Node {} drain started with {} shard migrations\",\n875\t request.node_id,\n876\t migrations_count\n877\t ),\n878\t migrations_count,\n879\t })\n880\t }\n881\t\n882\t /// Remove a node from the cluster (after drain).\n883\t pub async fn remove_node(\n884\t &self,\n885\t request: RemoveNodeRequest,\n886\t ) -> Result {\n887\t info!(node_id = %request.node_id, force = request.force, \"starting node removal\");\n888\t\n889\t let node_id = TopologyNodeId::new(request.node_id.clone());\n890\t\n891\t // Check node state\n892\t let node_status = {\n893\t let topo = self.topology.read().await;\n894\t let node = topo.node(&node_id).ok_or_else(|| {\n895\t RebalancerError::NodeNotFound(request.node_id.clone())\n896\t })?;\n897\t\n898\t // Check if this is the last node in the group\n899\t let group = topo\n900\t .groups()\n901\t .find(|g| g.id == node.replica_group)\n902\t .ok_or_else(|| RebalancerError::GroupNotFound(node.replica_group))?;\n903\t\n904\t if group.nodes().len() <= 1 {\n905\t return Err(RebalancerError::CannotRemoveLastNode);\n906\t }\n907\t\n908\t node.status\n909\t };\n910\t\n911\t if !request.force && node_status != NodeStatus::Draining {\n912\t return Err(RebalancerError::InvalidState(format!(\n913\t \"node {} is not in draining state (current: {:?}), use force=true to bypass\",\n914\t request.node_id, node_status\n915\t )));\n916\t }\n917\t\n918\t // Create operation record\n919\t let op_id = self.next_op_id.fetch_add(1, std::sync::atomic::Ordering::SeqCst);\n920\t\n921\t // Remove node from topology\n922\t {\n923\t let mut topo = self.topology.write().await;\n924\t topo.remove_node(&node_id);\n925\t }\n926\t\n927\t // Record operation\n928\t let operation = TopologyOperation {\n929\t id: op_id,\n930\t op_type: TopologyOperationType::RemoveNode,\n931\t status: TopologyOperationStatus::Complete,\n932\t target_node: Some(request.node_id.clone()),\n933\t target_group: None,\n934\t migrations: Vec::new(),\n935\t started_at: Some(now_ms()),\n936\t completed_at: Some(now_ms()),\n937\t error: None,\n938\t };\n939\t\n940\t {\n941\t let mut ops = self.operations.write().await;\n942\t ops.insert(op_id, operation);\n943\t }\n944\t\n945\t Ok(TopologyOperationResult {\n946\t id: op_id,\n947\t message: format!(\"Node {} removed from cluster\", request.node_id),\n948\t migrations_count: 0,\n949\t })\n950\t }\n951\t\n952\t /// Add a replica group.\n953\t pub async fn add_replica_group(\n954\t &self,\n955\t request: AddReplicaGroupRequest,\n956\t ) -> Result {\n957\t info!(group_id = request.group_id, node_count = request.nodes.len(), \"starting replica group addition\");\n958\t\n959\t // Check if group already exists\n960\t {\n961\t let topo = self.topology.read().await;\n962\t if topo.groups().any(|g| g.id == request.group_id) {\n963\t return Err(RebalancerError::InvalidState(format!(\n964\t \"replica group {} already exists\",\n965\t request.group_id\n966\t )));\n967\t }\n968\t }\n969\t\n970\t // Create operation record\n971\t let op_id = self.next_op_id.fetch_add(1, std::sync::atomic::Ordering::SeqCst);\n972\t\n973\t // Add nodes to topology\n974\t let node_ids: Vec = request.nodes.iter().map(|n| n.id.clone()).collect();\n975\t for node_spec in &request.nodes {\n976\t let mut topo = self.topology.write().await;\n977\t let node = Node::new(\n978\t TopologyNodeId::new(node_spec.id.clone()),\n979\t node_spec.address.clone(),\n980\t request.group_id,\n981\t );\n982\t topo.add_node(node);\n983\t }\n984\t\n985\t // For replica groups, we don't migrate data - the new group will sync from existing groups\n986\t // This is handled by the replication mechanism\n987\t\n988\t // Record operation\n989\t let operation = TopologyOperation {\n990\t id: op_id,\n991\t op_type: TopologyOperationType::AddReplicaGroup,\n992\t status: TopologyOperationStatus::Complete,\n993\t target_node: None,\n994\t target_group: Some(request.group_id),\n995\t migrations: Vec::new(),\n996\t started_at: Some(now_ms()),\n997\t completed_at: Some(now_ms()),\n998\t error: None,\n999\t };\n1000\t\n1001\t {\n1002\t let mut ops = self.operations.write().await;\n1003\t ops.insert(op_id, operation);\n1004\t }\n1005\t\n1006\t Ok(TopologyOperationResult {\n1007\t id: op_id,\n1008\t message: format!(\n1009\t \"Replica group {} added with {} nodes\",\n1010\t request.group_id,\n1011\t node_ids.len()\n1012\t ),\n1013\t migrations_count: 0,\n1014\t })\n1015\t }\n1016\t\n1017\t /// Remove a replica group.\n1018\t pub async fn remove_replica_group(\n1019\t &self,\n1020\t request: RemoveReplicaGroupRequest,\n1021\t ) -> Result {\n1022\t info!(group_id = request.group_id, force = request.force, \"starting replica group removal\");\n1023\t\n1024\t // Check if group exists and is empty\n1025\t {\n1026\t let topo = self.topology.read().await;\n1027\t let group = topo.groups().find(|g| g.id == request.group_id);\n1028\t\n1029\t let Some(grp) = group else {\n1030\t return Err(RebalancerError::GroupNotFound(request.group_id));\n1031\t };\n1032\t\n1033\t if !request.force && !grp.nodes().is_empty() {\n1034\t return Err(RebalancerError::GroupNotEmpty(request.group_id));\n1035\t }\n1036\t\n1037\t // Check if this is the last group\n1038\t if topo.groups().count() <= 1 {\n1039\t return Err(RebalancerError::InvalidState(\n1040\t \"cannot remove the last replica group\".into(),\n1041\t ));\n1042\t }\n1043\t }\n1044\t\n1045\t // Create operation record\n1046\t let op_id = self.next_op_id.fetch_add(1, std::sync::atomic::Ordering::SeqCst);\n1047\t\n1048\t // Remove group from topology (this removes all nodes in the group)\n1049\t {\n1050\t let mut topo = self.topology.write().await;\n1051\t topo.remove_group(request.group_id);\n1052\t }\n1053\t\n1054\t // Record operation\n1055\t let operation = TopologyOperation {\n1056\t id: op_id,\n1057\t op_type: TopologyOperationType::RemoveReplicaGroup,\n1058\t status: TopologyOperationStatus::Complete,\n1059\t target_node: None,\n1060\t target_group: Some(request.group_id),\n1061\t migrations: Vec::new(),\n1062\t started_at: Some(now_ms()),\n1063\t completed_at: Some(now_ms()),\n1064\t error: None,\n1065\t };\n1066\t\n1067\t {\n1068\t let mut ops = self.operations.write().await;\n1069\t ops.insert(op_id, operation);\n1070\t }\n1071\t\n1072\t Ok(TopologyOperationResult {\n1073\t id: op_id,\n1074\t message: format!(\"Replica group {} removed from cluster\", request.group_id),\n1075\t migrations_count: 0,\n1076\t })\n1077\t }\n1078\t\n1079\t /// Handle a node failure.\n1080\t pub async fn handle_node_failure(\n1081\t &self,\n1082\t node_id: &str,\n1083\t ) -> Result {\n1084\t warn!(node_id = %node_id, \"handling node failure\");\n1085\t\n1086\t let node_id_obj = TopologyNodeId::new(node_id.to_string());\n1087\t\n1088\t // Mark node as failed\n1089\t let replica_group = {\n1090\t let mut topo = self.topology.write().await;\n1091\t let node = topo.node_mut(&node_id_obj).ok_or_else(|| {\n1092\t RebalancerError::NodeNotFound(node_id.to_string())\n1093\t })?;\n1094\t\n1095\t node.status = NodeStatus::Failed;\n1096\t node.replica_group\n1097\t };\n1098\t\n1099\t // Create operation record\n1100\t let op_id = self.next_op_id.fetch_add(1, std::sync::atomic::Ordering::SeqCst);\n1101\t\n1102\t // TODO: Schedule background replication to restore RF if needed\n1103\t // For now, just record the failure\n1104\t\n1105\t let operation = TopologyOperation {\n1106\t id: op_id,\n1107\t op_type: TopologyOperationType::NodeFailure,\n1108\t status: TopologyOperationStatus::Complete,\n1109\t target_node: Some(node_id.to_string()),\n1110\t target_group: Some(replica_group),\n1111\t migrations: Vec::new(),\n1112\t started_at: Some(now_ms()),\n1113\t completed_at: Some(now_ms()),\n1114\t error: None,\n1115\t };\n1116\t\n1117\t {\n1118\t let mut ops = self.operations.write().await;\n1119\t ops.insert(op_id, operation);\n1120\t }\n1121\t\n1122\t Ok(TopologyOperationResult {\n1123\t id: op_id,\n1124\t message: format!(\"Node {} marked as failed\", node_id),\n1125\t migrations_count: 0,\n1126\t })\n1127\t }\n1128\t\n1129\t /// Compute which shards should move to a new node.\n1130\t /// Returns shard -> old_owner mapping for shards that will move.\n1131\t ///\n1132\t /// For each shard where the new node enters the assignment, we select one\n1133\t /// of the old owners as the migration source. If the new node displaced\n1134\t /// an old owner, we use that node; otherwise we use the lowest-scored old owner.\n1135\t async fn compute_shard_moves_for_new_node(\n1136\t &self,\n1137\t new_node_id: &str,\n1138\t replica_group: u32,\n1139\t ) -> Result, RebalancerError> {\n1140\t let topo = self.topology.read().await;\n1141\t\n1142\t let new_node_id = TopologyNodeId::new(new_node_id.to_string());\n1143\t let rf = topo.rf();\n1144\t\n1145\t // Find the target group\n1146\t let group = topo\n1147\t .groups()\n1148\t .find(|g| g.id == replica_group)\n1149\t .ok_or_else(|| RebalancerError::GroupNotFound(replica_group))?;\n1150\t\n1151\t let existing_nodes: Vec<_> = group.nodes().iter().cloned().collect();\n1152\t let mut affected_shards = Vec::new();\n1153\t\n1154\t // For each shard, check if the new node is in the new assignment\n1155\t for shard_id in 0..topo.shards {\n1156\t let old_assignment: Vec<_> = assign_shard_in_group(shard_id, &existing_nodes, rf)\n1157\t .into_iter()\n1158\t .collect();\n1159\t\n1160\t // New assignment with the new node included\n1161\t let all_nodes: Vec<_> = existing_nodes\n1162\t .iter()\n1163\t .cloned()\n1164\t .chain(std::iter::once(new_node_id.clone()))\n1165\t .collect();\n1166\t let new_assignment: Vec<_> = assign_shard_in_group(shard_id, &all_nodes, rf)\n1167\t .into_iter()\n1168\t .collect();\n1169\t\n1170\t // Check if new node is in the new assignment\n1171\t if !new_assignment.contains(&new_node_id) {\n1172\t continue;\n1173\t }\n1174\t\n1175\t // Find the source node for migration\n1176\t // Priority 1: Use the displaced node (if any)\n1177\t // Priority 2: Use the lowest-scored old owner (load balancing)\n1178\t let source_node = if let Some(displaced) = old_assignment.iter()\n1179\t .find(|n| !new_assignment.contains(n)) {\n1180\t // An old node was displaced - use it as source\n1181\t displaced.clone()\n1182\t } else {\n1183\t // No displacement - pick lowest-scored old owner\n1184\t // Find the old owner with the minimum rendezvous score\n1185\t let mut min_score = u64::MAX;\n1186\t let mut min_node = old_assignment.first().cloned()\n1187\t .unwrap_or_else(|| existing_nodes.first().unwrap().clone());\n1188\t\n1189\t for old_node in &old_assignment {\n1190\t let s = score(shard_id, old_node.as_str());\n1191\t if s < min_score {\n1192\t min_score = s;\n1193\t min_node = old_node.clone();\n1194\t }\n1195\t }\n1196\t min_node\n1197\t };\n1198\t\n1199\t affected_shards.push((ShardId(shard_id), source_node));\n1200\t }\n1201\t\n1202\t Ok(affected_shards)\n1203\t }\n1204\t\n1205\t /// Compute where each shard should go when draining a node.\n1206\t /// Returns shard -> destination_node mapping.\n1207\t async fn compute_shard_destinations_for_drain(\n1208\t &self,\n1209\t drain_node_id: &str,\n1210\t replica_group: u32,\n1211\t ) -> Result, RebalancerError> {\n1212\t let topo = self.topology.read().await;\n1213\t\n1214\t let drain_node_id = TopologyNodeId::new(drain_node_id.to_string());\n1215\t let rf = topo.rf();\n1216\t\n1217\t // Find the target group\n1218\t let group = topo\n1219\t .groups()\n1220\t .find(|g| g.id == replica_group)\n1221\t .ok_or_else(|| RebalancerError::GroupNotFound(replica_group))?;\n1222\t\n1223\t let other_nodes: Vec<_> = group\n1224\t .nodes()\n1225\t .iter()\n1226\t .filter(|n| **n != drain_node_id)\n1227\t .cloned()\n1228\t .collect();\n1229\t\n1230\t if other_nodes.is_empty() {\n1231\t return Err(RebalancerError::CannotRemoveLastNode);\n1232\t }\n1233\t\n1234\t let mut destinations = Vec::new();\n1235\t\n1236\t // For each shard, find a new owner among the remaining nodes\n1237\t for shard_id in 0..topo.shards {\n1238\t // Check if the draining node is in the assignment for this shard\n1239\t let assignment: Vec<_> = assign_shard_in_group(shard_id, group.nodes(), rf);\n1240\t\n1241\t if assignment.contains(&drain_node_id) {\n1242\t // This shard needs a new home\n1243\t // Use rendezvous hash to pick the best remaining node\n1244\t let mut best_node = None;\n1245\t let mut best_score = 0u64;\n1246\t\n1247\t for node in &other_nodes {\n1248\t let s = score(shard_id, node.as_str());\n1249\t if s > best_score {\n1250\t best_score = s;\n1251\t best_node = Some(node.clone());\n1252\t }\n1253\t }\n1254\t\n1255\t if let Some(dest) = best_node {\n1256\t destinations.push((ShardId(shard_id), dest));\n1257\t }\n1258\t }\n1259\t }\n1260\t\n1261\t Ok(destinations)\n1262\t }\n1263\t}\n1264\t\n1265\t/// Background task to run migrations for a topology operation.\n1266\tasync fn run_migration_task(\n1267\t topology: Arc>,\n1268\t coordinator: Arc>,\n1269\t operations: Arc>>,\n1270\t active_migrations: Arc>>,\n1271\t op_id: u64,\n1272\t migrations: Vec,\n1273\t config: RebalancerConfig,\n1274\t executor: Option>,\n1275\t metrics: Arc>,\n1276\t) -> Result<(), RebalancerError> {\n1277\t let Some(exec) = executor else {\n1278\t // No executor - simulate completion for testing\n1279\t for mid in migrations {\n1280\t tokio::time::sleep(tokio::time::Duration::from_millis(\n1281\t config.migration_batch_delay_ms,\n1282\t ))\n1283\t .await;\n1284\t\n1285\t let shards_to_complete = {\n1286\t let coord = coordinator.read().await;\n1287\t if let Some(state) = coord.get_state(mid) {\n1288\t state.old_owners.keys().copied().collect::>()\n1289\t } else {\n1290\t continue;\n1291\t }\n1292\t };\n1293\t\n1294\t let docs_per_shard = 1000u64;\n1295\t {\n1296\t let mut coord = coordinator.write().await;\n1297\t for shard in &shards_to_complete {\n1298\t coord.shard_migration_complete(mid, *shard, docs_per_shard)?;\n1299\t }\n1300\t }\n1301\t\n1302\t // Record metrics for simulated migration\n1303\t {\n1304\t let mut metrics_guard = metrics.write().await;\n1305\t metrics_guard.record_documents_migrated(docs_per_shard * shards_to_complete.len() as u64);\n1306\t }\n1307\t\n1308\t {\n1309\t let mut coord = coordinator.write().await;\n1310\t coord.begin_cutover(mid)?;\n1311\t coord.complete_drain(mid)?;\n1312\t coord.complete_cleanup(mid)?;\n1313\t }\n1314\t\n1315\t {\n1316\t let mut active = active_migrations.write().await;\n1317\t active.remove(&mid);\n1318\t }\n1319\t }\n1320\t\n1321\t // Mark operation as complete\n1322\t {\n1323\t let mut ops = operations.write().await;\n1324\t if let Some(op) = ops.get_mut(&op_id) {\n1325\t op.status = TopologyOperationStatus::Complete;\n1326\t op.completed_at = Some(now_ms());\n1327\t }\n1328\t }\n1329\t\n1330\t // Mark new node as active\n1331\t {\n1332\t let mut topo = topology.write().await;\n1333\t let ops = operations.read().await;\n1334\t if let Some(op) = ops.get(&op_id) {\n1335\t if let Some(ref node_id) = op.target_node {\n1336\t let node_id = TopologyNodeId::new(node_id.clone());\n1337\t if let Some(node) = topo.node_mut(&node_id) {\n1338\t node.status = NodeStatus::Active;\n1339\t }\n1340\t }\n1341\t }\n1342\t }\n1343\t\n1344\t return Ok(());\n1345\t };\n1346\t\n1347\t // With executor - perform actual migration\n1348\t // For each migration (each shard that moves to the new node)\n1349\t for mid in migrations {\n1350\t // Get migration state to find source/target info\n1351\t let (new_node, _replica_group, old_owners, index_uid) = {\n1352\t let coord = coordinator.read().await;\n1353\t let state = coord.get_state(mid).ok_or_else(|| {\n1354\t RebalancerError::InvalidState(\"migration state not found\".into())\n1355\t })?;\n1356\t\n1357\t // Use a default index for now - in production, this would come from config\n1358\t let index_uid = \"default\".to_string();\n1359\t\n1360\t (\n1361\t state.new_node.to_string(),\n1362\t state.replica_group,\n1363\t state.old_owners.clone(),\n1364\t index_uid,\n1365\t )\n1366\t };\n1367\t\n1368\t // Get node addresses\n1369\t let (new_node_address, old_owner_addresses) = {\n1370\t let topo = topology.read().await;\n1371\t let new_addr = topo.node(&TopologyNodeId::new(new_node.to_string()))\n1372\t .ok_or_else(|| RebalancerError::NodeNotFound(new_node.to_string()))?\n1373\t .address.clone();\n1374\t\n1375\t let mut old_addrs = HashMap::new();\n1376\t for (shard, old_node) in &old_owners {\n1377\t if let Some(node) = topo.node(&migration_to_topo_node_id(old_node)) {\n1378\t old_addrs.insert(*shard, node.address.clone());\n1379\t }\n1380\t }\n1381\t\n1382\t (new_addr, old_addrs)\n1383\t };\n1384\t\n1385\t let mut migration_total_docs = 0u64;\n1386\t\n1387\t // For each shard in the migration\n1388\t for (shard_id, old_node_id) in &old_owners {\n1389\t let old_address = old_owner_addresses.get(shard_id)\n1390\t .ok_or_else(|| RebalancerError::InvalidState(\"old node address not found\".into()))?;\n1391\t\n1392\t info!(\n1393\t migration_id = %mid,\n1394\t shard_id = shard_id.0,\n1395\t from = %old_node_id.0,\n1396\t to = %new_node,\n1397\t \"starting shard migration\"\n1398\t );\n1399\t\n1400\t // Paginate through all documents for this shard\n1401\t let mut offset = 0u32;\n1402\t let limit = config.migration_batch_size;\n1403\t let mut total_docs_copied = 0u64;\n1404\t\n1405\t loop {\n1406\t // Fetch documents from source\n1407\t let (docs, _total) = exec.fetch_documents(\n1408\t &old_node_id.0,\n1409\t old_address,\n1410\t &index_uid,\n1411\t shard_id.0,\n1412\t limit,\n1413\t offset,\n1414\t ).await.map_err(|e| {\n1415\t RebalancerError::InvalidState(format!(\"fetch failed: {}\", e))\n1416\t })?;\n1417\t\n1418\t if docs.is_empty() {\n1419\t break; // No more documents\n1420\t }\n1421\t\n1422\t // Write documents to target\n1423\t exec.write_documents(\n1424\t &new_node,\n1425\t &new_node_address,\n1426\t &index_uid,\n1427\t docs.clone(),\n1428\t ).await.map_err(|e| {\n1429\t RebalancerError::InvalidState(format!(\"write failed: {}\", e))\n1430\t })?;\n1431\t\n1432\t total_docs_copied += docs.len() as u64;\n1433\t offset += limit;\n1434\t\n1435\t // Throttle if configured\n1436\t if config.migration_batch_delay_ms > 0 {\n1437\t tokio::time::sleep(tokio::time::Duration::from_millis(\n1438\t config.migration_batch_delay_ms,\n1439\t ))\n1440\t .await;\n1441\t }\n1442\t }\n1443\t\n1444\t // Mark shard migration complete\n1445\t {\n1446\t let mut coord = coordinator.write().await;\n1447\t coord.shard_migration_complete(mid, *shard_id, total_docs_copied)?;\n1448\t }\n1449\t\n1450\t migration_total_docs += total_docs_copied;\n1451\t\n1452\t info!(\n1453\t migration_id = %mid,\n1454\t shard_id = shard_id.0,\n1455\t docs_copied = total_docs_copied,\n1456\t \"shard migration complete\"\n1457\t );\n1458\t }\n1459\t\n1460\t // Record metrics for this migration\n1461\t {\n1462\t let mut metrics_guard = metrics.write().await;\n1463\t metrics_guard.record_documents_migrated(migration_total_docs);\n1464\t }\n1465\t\n1466\t // All shards for this migration complete - begin cutover\n1467\t {\n1468\t let mut coord = coordinator.write().await;\n1469\t coord.begin_cutover(mid)?;\n1470\t }\n1471\t\n1472\t // Delta pass: re-read from source to catch stragglers\n1473\t for (shard_id, old_node_id) in &old_owners {\n1474\t let old_address = old_owner_addresses.get(shard_id).unwrap();\n1475\t\n1476\t let (docs, _) = exec.fetch_documents(\n1477\t &old_node_id.0,\n1478\t old_address,\n1479\t &index_uid,\n1480\t shard_id.0,\n1481\t config.migration_batch_size,\n1482\t 0,\n1483\t ).await.map_err(|e| {\n1484\t RebalancerError::InvalidState(format!(\"delta fetch failed: {}\", e))\n1485\t })?;\n1486\t\n1487\t if !docs.is_empty() {\n1488\t // Write any stragglers to target\n1489\t exec.write_documents(\n1490\t &new_node,\n1491\t &new_node_address,\n1492\t &index_uid,\n1493\t docs,\n1494\t ).await.map_err(|e| {\n1495\t RebalancerError::InvalidState(format!(\"delta write failed: {}\", e))\n1496\t })?;\n1497\t }\n1498\t\n1499\t // Mark delta complete\n1500\t {\n1501\t let mut coord = coordinator.write().await;\n1502\t // Complete drain after delta pass\n1503\t coord.complete_drain(mid)?;\n1504\t }\n1505\t }\n1506\t\n1507\t // Activate shards\n1508\t {\n1509\t let mut coord = coordinator.write().await;\n1510\t coord.complete_cleanup(mid)?;\n1511\t }\n1512\t\n1513\t // Delete migrated shards from old nodes\n1514\t for (shard_id, old_node_id) in &old_owners {\n1515\t let old_address = old_owner_addresses.get(shard_id).unwrap();\n1516\t\n1517\t if let Err(e) = exec.delete_shard(\n1518\t &old_node_id.0,\n1519\t old_address,\n1520\t &index_uid,\n1521\t shard_id.0,\n1522\t ).await {\n1523\t warn!(\n1524\t shard_id = shard_id.0,\n1525\t node = %old_node_id.0,\n1526\t error = %e,\n1527\t \"failed to delete migrated shard from old node (may need manual cleanup)\"\n1528\t );\n1529\t }\n1530\t }\n1531\t\n1532\t // Remove from active migrations\n1533\t {\n1534\t let mut active = active_migrations.write().await;\n1535\t active.remove(&mid);\n1536\t }\n1537\t }\n1538\t\n1539\t // Mark operation as complete\n1540\t {\n1541\t let mut ops = operations.write().await;\n1542\t if let Some(op) = ops.get_mut(&op_id) {\n1543\t op.status = TopologyOperationStatus::Complete;\n1544\t op.completed_at = Some(now_ms());\n1545\t }\n1546\t }\n1547\t\n1548\t // Mark new node as active\n1549\t {\n1550\t let mut topo = topology.write().await;\n1551\t let ops = operations.read().await;\n1552\t if let Some(op) = ops.get(&op_id) {\n1553\t if let Some(ref node_id) = op.target_node {\n1554\t let node_id = TopologyNodeId::new(node_id.clone());\n1555\t if let Some(node) = topo.node_mut(&node_id) {\n1556\t node.status = NodeStatus::Active;\n1557\t }\n1558\t }\n1559\t }\n1560\t }\n1561\t\n1562\t Ok(())\n1563\t}\n1564\t\n1565\t/// Background task to run drain migrations for a node.\n1566\tasync fn run_drain_task(\n1567\t topology: Arc>,\n1568\t coordinator: Arc>,\n1569\t operations: Arc>>,\n1570\t active_migrations: Arc>>,\n1571\t op_id: u64,\n1572\t migrations: Vec,\n1573\t config: RebalancerConfig,\n1574\t drain_node_id: String,\n1575\t executor: Option>,\n1576\t metrics: Arc>,\n1577\t) -> Result<(), RebalancerError> {\n1578\t let Some(exec) = executor else {\n1579\t // No executor - simulate completion for testing\n1580\t for mid in migrations {\n1581\t tokio::time::sleep(tokio::time::Duration::from_millis(\n1582\t config.migration_batch_delay_ms,\n1583\t ))\n1584\t .await;\n1585\t\n1586\t let shards_to_complete = {\n1587\t let coord = coordinator.read().await;\n1588\t if let Some(state) = coord.get_state(mid) {\n1589\t state.old_owners.keys().copied().collect::>()\n1590\t } else {\n1591\t continue;\n1592\t }\n1593\t };\n1594\t\n1595\t let docs_per_shard = 1000u64;\n1596\t {\n1597\t let mut coord = coordinator.write().await;\n1598\t for shard in &shards_to_complete {\n1599\t coord.shard_migration_complete(mid, *shard, docs_per_shard)?;\n1600\t }\n1601\t }\n1602\t\n1603\t // Record metrics for simulated migration\n1604\t {\n1605\t let mut metrics_guard = metrics.write().await;\n1606\t metrics_guard.record_documents_migrated(docs_per_shard * shards_to_complete.len() as u64);\n1607\t }\n1608\t\n1609\t {\n1610\t let mut coord = coordinator.write().await;\n1611\t coord.begin_cutover(mid)?;\n1612\t coord.complete_drain(mid)?;\n1613\t coord.complete_cleanup(mid)?;\n1614\t }\n1615\t\n1616\t {\n1617\t let mut active = active_migrations.write().await;\n1618\t active.remove(&mid);\n1619\t }\n1620\t }\n1621\t\n1622\t // Mark operation as complete\n1623\t {\n1624\t let mut ops = operations.write().await;\n1625\t if let Some(op) = ops.get_mut(&op_id) {\n1626\t op.status = TopologyOperationStatus::Complete;\n1627\t op.completed_at = Some(now_ms());\n1628\t }\n1629\t }\n1630\t\n1631\t // Mark drained node as removed (operator can delete PVC)\n1632\t {\n1633\t let mut topo = topology.write().await;\n1634\t let node_id = TopologyNodeId::new(drain_node_id);\n1635\t if let Some(node) = topo.node_mut(&node_id) {\n1636\t node.status = NodeStatus::Removed;\n1637\t }\n1638\t }\n1639\t\n1640\t return Ok(());\n1641\t };\n1642\t\n1643\t // With executor - perform actual drain migration\n1644\t // For each migration (each shard being drained from the node)\n1645\t for mid in migrations {\n1646\t // Get migration state\n1647\t let (new_node, _replica_group, old_owners, index_uid) = {\n1648\t let coord = coordinator.read().await;\n1649\t let state = coord.get_state(mid).ok_or_else(|| {\n1650\t RebalancerError::InvalidState(\"migration state not found\".into())\n1651\t })?;\n1652\t\n1653\t // Use a default index for now\n1654\t let index_uid = \"default\".to_string();\n1655\t\n1656\t (\n1657\t state.new_node.to_string(),\n1658\t state.replica_group,\n1659\t state.old_owners.clone(),\n1660\t index_uid,\n1661\t )\n1662\t };\n1663\t\n1664\t // Get node addresses\n1665\t let (_drain_node_id_obj, drain_node_address, new_node_address) = {\n1666\t let topo = topology.read().await;\n1667\t let drain_id = TopologyNodeId::new(drain_node_id.clone());\n1668\t let drain_addr = topo.node(&drain_id)\n1669\t .ok_or_else(|| RebalancerError::NodeNotFound(drain_node_id.clone()))?\n1670\t .address.clone();\n1671\t\n1672\t let new_addr = topo.node(&TopologyNodeId::new(new_node.to_string()))\n1673\t .ok_or_else(|| RebalancerError::NodeNotFound(new_node.to_string()))?\n1674\t .address.clone();\n1675\t\n1676\t (drain_id, drain_addr, new_addr)\n1677\t };\n1678\t\n1679\t // For each shard being drained\n1680\t for (shard_id, _old_node) in &old_owners {\n1681\t info!(\n1682\t migration_id = %mid,\n1683\t shard_id = shard_id.0,\n1684\t from = %drain_node_id,\n1685\t to = %new_node,\n1686\t \"starting shard drain\"\n1687\t );\n1688\t\n1689\t // Paginate through all documents for this shard on the draining node\n1690\t let mut offset = 0u32;\n1691\t let limit = config.migration_batch_size;\n1692\t let mut total_docs_copied = 0u64;\n1693\t\n1694\t loop {\n1695\t // Fetch documents from draining node\n1696\t let (docs, _total) = exec.fetch_documents(\n1697\t &drain_node_id,\n1698\t &drain_node_address,\n1699\t &index_uid,\n1700\t shard_id.0,\n1701\t limit,\n1702\t offset,\n1703\t ).await.map_err(|e| {\n1704\t RebalancerError::InvalidState(format!(\"fetch failed: {}\", e))\n1705\t })?;\n1706\t\n1707\t if docs.is_empty() {\n1708\t break; // No more documents\n1709\t }\n1710\t\n1711\t // Write documents to new node\n1712\t exec.write_documents(\n1713\t &new_node,\n1714\t &new_node_address,\n1715\t &index_uid,\n1716\t docs.clone(),\n1717\t ).await.map_err(|e| {\n1718\t RebalancerError::InvalidState(format!(\"write failed: {}\", e))\n1719\t })?;\n1720\t\n1721\t total_docs_copied += docs.len() as u64;\n1722\t offset += limit;\n1723\t\n1724\t if config.migration_batch_delay_ms > 0 {\n1725\t tokio::time::sleep(tokio::time::Duration::from_millis(\n1726\t config.migration_batch_delay_ms,\n1727\t ))\n1728\t .await;\n1729\t }\n1730\t }\n1731\t\n1732\t // Mark shard migration complete\n1733\t {\n1734\t let mut coord = coordinator.write().await;\n1735\t coord.shard_migration_complete(mid, *shard_id, total_docs_copied)?;\n1736\t }\n1737\t\n1738\t info!(\n1739\t migration_id = %mid,\n1740\t shard_id = shard_id.0,\n1741\t docs_copied = total_docs_copied,\n1742\t \"shard drain complete\"\n1743\t );\n1744\t }\n1745\t\n1746\t // All shards for this migration complete - begin cutover\n1747\t {\n1748\t let mut coord = coordinator.write().await;\n1749\t coord.begin_cutover(mid)?;\n1750\t }\n1751\t\n1752\t // Delta pass: re-read from draining node to catch stragglers\n1753\t for (shard_id, _old_node) in &old_owners {\n1754\t let (docs, _) = exec.fetch_documents(\n1755\t &drain_node_id,\n1756\t &drain_node_address,\n1757\t &index_uid,\n1758\t shard_id.0,\n1759\t config.migration_batch_size,\n1760\t 0,\n1761\t ).await.map_err(|e| {\n1762\t RebalancerError::InvalidState(format!(\"delta fetch failed: {}\", e))\n1763\t })?;\n1764\t\n1765\t if !docs.is_empty() {\n1766\t // Write any stragglers to new node\n1767\t exec.write_documents(\n1768\t &new_node,\n1769\t &new_node_address,\n1770\t &index_uid,\n1771\t docs,\n1772\t ).await.map_err(|e| {\n1773\t RebalancerError::InvalidState(format!(\"delta write failed: {}\", e))\n1774\t })?;\n1775\t }\n1776\t\n1777\t {\n1778\t let mut coord = coordinator.write().await;\n1779\t coord.complete_drain(mid)?;\n1780\t }\n1781\t }\n1782\t\n1783\t // Activate shards and complete cleanup\n1784\t {\n1785\t let mut coord = coordinator.write().await;\n1786\t coord.complete_cleanup(mid)?;\n1787\t }\n1788\t\n1789\t // Delete drained shards from the draining node\n1790\t for (shard_id, _old_node) in &old_owners {\n1791\t if let Err(e) = exec.delete_shard(\n1792\t &drain_node_id,\n1793\t &drain_node_address,\n1794\t &index_uid,\n1795\t shard_id.0,\n1796\t ).await {\n1797\t warn!(\n1798\t shard_id = shard_id.0,\n1799\t node = %drain_node_id,\n1800\t error = %e,\n1801\t \"failed to delete drained shard (may need manual cleanup)\"\n1802\t );\n1803\t }\n1804\t }\n1805\t\n1806\t {\n1807\t let mut active = active_migrations.write().await;\n1808\t active.remove(&mid);\n1809\t }\n1810\t }\n1811\t\n1812\t // Mark operation as complete\n1813\t {\n1814\t let mut ops = operations.write().await;\n1815\t if let Some(op) = ops.get_mut(&op_id) {\n1816\t op.status = TopologyOperationStatus::Complete;\n1817\t op.completed_at = Some(now_ms());\n1818\t }\n1819\t }\n1820\t\n1821\t // Mark drained node as removed (operator can delete PVC)\n1822\t {\n1823\t let mut topo = topology.write().await;\n1824\t let node_id = TopologyNodeId::new(drain_node_id);\n1825\t if let Some(node) = topo.node_mut(&node_id) {\n1826\t node.status = NodeStatus::Removed;\n1827\t }\n1828\t }\n1829\t\n1830\t Ok(())\n1831\t}\n1832\t\n1833\t/// Get current time in milliseconds since Unix epoch.\n1834\tfn now_ms() -> u64 {\n1835\t std::time::SystemTime::now()\n1836\t .duration_since(std::time::UNIX_EPOCH)\n1837\t .unwrap_or_default()\n1838\t .as_millis() as u64\n1839\t}\n1840\t\n1841\t// ---------------------------------------------------------------------------\n1842\t// HttpMigrationExecutor - Actual HTTP-based document migration\n1843\t// ---------------------------------------------------------------------------\n1844\t\n1845\t/// HTTP-based migration executor for moving documents between Meilisearch nodes.\n1846\t///\n1847\t/// This implements the `MigrationExecutor` trait by making actual HTTP requests\n1848\t/// to Meilisearch nodes' APIs. It uses the `_miroir_shard` filterable attribute\n1849\t/// to fetch only the documents belonging to a specific shard.\n1850\tpub struct HttpMigrationExecutor {\n1851\t /// Master key for authenticating with Meilisearch nodes.\n1852\t node_master_key: String,\n1853\t /// HTTP client for making requests to nodes.\n1854\t client: reqwest::Client,\n1855\t}\n1856\t\n1857\timpl HttpMigrationExecutor {\n1858\t /// Create a new HTTP migration executor.\n1859\t ///\n1860\t /// # Arguments\n1861\t /// * `node_master_key` - Master key for authenticating with Meilisearch nodes\n1862\t /// * `node_timeout_ms` - Timeout for HTTP requests to nodes (milliseconds)\n1863\t pub fn new(node_master_key: String, node_timeout_ms: u64) -> Self {\n1864\t let timeout = std::time::Duration::from_millis(node_timeout_ms);\n1865\t\n1866\t let client = reqwest::Client::builder()\n1867\t .timeout(timeout)\n1868\t .build()\n1869\t .expect(\"Failed to create HTTP client for migration executor\");\n1870\t\n1871\t Self {\n1872\t node_master_key,\n1873\t client,\n1874\t }\n1875\t }\n1876\t\n1877\t /// Build the filter string for fetching documents by shard.\n1878\t fn shard_filter(&self, shard_id: u32) -> String {\n1879\t format!(\"_miroir_shard = {}\", shard_id)\n1880\t }\n1881\t\n1882\t /// Make an authenticated GET request to a node.\n1883\t async fn get_node(\n1884\t &self,\n1885\t node_address: &str,\n1886\t path: &str,\n1887\t ) -> std::result::Result {\n1888\t let url = if node_address.ends_with('/') {\n1889\t format!(\"{}{}\", node_address, path.trim_start_matches('/'))\n1890\t } else {\n1891\t format!(\"{}/{}\", node_address.trim_end_matches('/'), path.trim_start_matches('/'))\n1892\t };\n1893\t\n1894\t self.client\n1895\t .get(&url)\n1896\t .header(\"Authorization\", format!(\"Bearer {}\", self.node_master_key))\n1897\t .send()\n1898\t .await\n1899\t .map_err(|e| format!(\"GET {} failed: {}\", url, e))\n1900\t }\n1901\t\n1902\t /// Make an authenticated POST request to a node.\n1903\t async fn post_node(\n1904\t &self,\n1905\t node_address: &str,\n1906\t path: &str,\n1907\t body: serde_json::Value,\n1908\t ) -> std::result::Result {\n1909\t let url = if node_address.ends_with('/') {\n1910\t format!(\"{}{}\", node_address, path.trim_start_matches('/'))\n1911\t } else {\n1912\t format!(\"{}/{}\", node_address.trim_end_matches('/'), path.trim_start_matches('/'))\n1913\t };\n1914\t\n1915\t self.client\n1916\t .post(&url)\n1917\t .header(\"Authorization\", format!(\"Bearer {}\", self.node_master_key))\n1918\t .json(&body)\n1919\t .send()\n1920\t .await\n1921\t .map_err(|e| format!(\"POST {} failed: {}\", url, e))\n1922\t }\n1923\t}\n1924\t\n1925\t#[async_trait::async_trait]\n1926\timpl MigrationExecutor for HttpMigrationExecutor {\n1927\t /// Fetch documents from a source node for a specific shard.\n1928\t ///\n1929\t /// Uses the `_miroir_shard` filterable attribute to retrieve only documents\n1930\t /// belonging to the specified shard, avoiding full index scans.\n1931\t async fn fetch_documents(\n1932\t &self,\n1933\t _source_node: &str,\n1934\t source_address: &str,\n1935\t index_uid: &str,\n1936\t shard_id: u32,\n1937\t limit: u32,\n1938\t offset: u32,\n1939\t ) -> std::result::Result<(Vec, u64), String> {\n1940\t let filter = self.shard_filter(shard_id);\n1941\t let path = format!(\n1942\t \"indexes/{}/documents?filter={}&limit={}&offset={}\",\n1943\t index_uid,\n1944\t urlencoding::encode(&filter),\n1945\t limit,\n1946\t offset\n1947\t );\n1948\t\n1949\t let response = self.get_node(source_address, &path).await?;\n1950\t\n1951\t if !response.status().is_success() {\n1952\t let status = response.status();\n1953\t let error_text = response.text().await.unwrap_or_else(|_| \"unable to read error\".to_string());\n1954\t return Err(format!(\n1955\t \"Failed to fetch documents from {}: HTTP {} - {}\",\n1956\t source_address, status, error_text\n1957\t ));\n1958\t }\n1959\t\n1960\t let json_body: serde_json::Value = response\n1961\t .json()\n1962\t .await\n1963\t .map_err(|e| format!(\"Failed to parse response from {}: {}\", source_address, e))?;\n1964\t\n1965\t // Meilisearch returns { results: [...], total: 123, limit: 20, offset: 0 }\n1966\t let results = json_body\n1967\t .get(\"results\")\n1968\t .and_then(|v| v.as_array())\n1969\t .ok_or_else(|| format!(\"Invalid response from {}: missing 'results' field\", source_address))?;\n1970\t\n1971\t let total = json_body\n1972\t .get(\"total\")\n1973\t .and_then(|v| v.as_u64())\n1974\t .unwrap_or(0);\n1975\t\n1976\t Ok((results.clone(), total))\n1977\t }\n1978\t\n1979\t /// Write documents to a target node.\n1980\t ///\n1981\t /// Documents already contain the `_miroir_shard` field from the source,\n1982\t /// so they can be written directly without modification.\n1983\t async fn write_documents(\n1984\t &self,\n1985\t _target_node: &str,\n1986\t target_address: &str,\n1987\t index_uid: &str,\n1988\t documents: Vec,\n1989\t ) -> std::result::Result<(), String> {\n1990\t if documents.is_empty() {\n1991\t return Ok(());\n1992\t }\n1993\t\n1994\t let path = format!(\"indexes/{}/documents\", index_uid);\n1995\t\n1996\t let response = self.post_node(target_address, &path, serde_json::json!(documents)).await?;\n1997\t\n1998\t if !response.status().is_success() {\n1999\t let status = response.status();\n2000\t let error_text = response.text().await.unwrap_or_else(|_| \"unable to read error\".to_string());\n2001\t return Err(format!(\n2002\t \"Failed to write {} documents to {}: HTTP {} - {}\",\n2003\t documents.len(),\n2004\t target_address,\n2005\t status,\n2006\t error_text\n2007\t ));\n2008\t }\n2009\t\n2010\t // The response contains the task UID, but we don't need to wait for it\n2011\t // since migrations are eventually consistent via anti-entropy\n2012\t Ok(())\n2013\t }\n2014\t\n2015\t /// Delete documents from a node by shard filter.\n2016\t ///\n2017\t /// This is called after a shard migration is complete to remove the\n2018\t /// migrated documents from the source node.\n2019\t async fn delete_shard(\n2020\t &self,\n2021\t _node: &str,\n2022\t node_address: &str,\n2023\t index_uid: &str,\n2024\t shard_id: u32,\n2025\t ) -> std::result::Result<(), String> {\n2026\t let filter = self.shard_filter(shard_id);\n2027\t let path = format!(\"indexes/{}/documents/delete\", index_uid);\n2028\t\n2029\t let body = serde_json::json!({\n2030\t \"filter\": filter\n2031\t });\n2032\t\n2033\t let response = self.post_node(node_address, &path, body).await?;\n2034\t\n2035\t if !response.status().is_success() {\n2036\t let status = response.status();\n2037\t let error_text = response.text().await.unwrap_or_else(|_| \"unable to read error\".to_string());\n2038\t return Err(format!(\n2039\t \"Failed to delete shard {} from {}: HTTP {} - {}\",\n2040\t shard_id, node_address, status, error_text\n2041\t ));\n2042\t }\n2043\t\n2044\t Ok(())\n2045\t }\n2046\t}\n2047\t\n2048\t#[cfg(test)]\n2049\tmod tests {\n2050\t use super::*;\n2051\t use crate::migration::MigrationConfig;\n2052\t use crate::topology::Node;\n2053\t use std::sync::Arc;\n2054\t\n2055\t fn test_topology() -> Topology {\n2056\t let mut topo = Topology::new(64, 2, 2);\n2057\t topo.add_node(Node::new(TopologyNodeId::new(\"node-0\".into()), \"http://node-0:7700\".into(), 0));\n2058\t topo.add_node(Node::new(TopologyNodeId::new(\"node-1\".into()), \"http://node-1:7700\".into(), 0));\n2059\t topo.add_node(Node::new(TopologyNodeId::new(\"node-2\".into()), \"http://node-2:7700\".into(), 1));\n2060\t topo.add_node(Node::new(TopologyNodeId::new(\"node-3\".into()), \"http://node-3:7700\".into(), 1));\n2061\t topo\n2062\t }\n2063\t\n2064\t #[test]\n2065\t fn test_rebalancer_config_default() {\n2066\t let config = RebalancerConfig::default();\n2067\t assert_eq!(config.max_concurrent_migrations, 4);\n2068\t assert_eq!(config.migration_timeout_s, 3600);\n2069\t assert!(config.auto_rebalance_on_recovery);\n2070\t }\n2071\t\n2072\t #[test]\n2073\t fn test_topology_operation_serialization() {\n2074\t let op = TopologyOperation {\n2075\t id: 1,\n2076\t op_type: TopologyOperationType::AddNode,\n2077\t status: TopologyOperationStatus::InProgress,\n2078\t target_node: Some(\"node-4\".into()),\n2079\t target_group: Some(0),\n2080\t migrations: vec![MigrationId(1), MigrationId(2)],\n2081\t started_at: Some(1700000000000),\n2082\t completed_at: None,\n2083\t error: None,\n2084\t };\n2085\t\n2086\t let json = serde_json::to_string(&op).unwrap();\n2087\t assert!(json.contains(\"\\\"op_type\\\":\\\"add_node\\\"\"));\n2088\t assert!(json.contains(\"\\\"status\\\":\\\"in_progress\\\"\"));\n2089\t assert!(json.contains(\"\\\"target_node\\\":\\\"node-4\\\"\"));\n2090\t }\n2091\t\n2092\t #[test]\n2093\t fn test_rebalance_status_serialization() {\n2094\t let status = RebalanceStatus {\n2095\t in_progress: true,\n2096\t operations: vec![],\n2097\t migrations: HashMap::new(),\n2098\t };\n2099\t\n2100\t let json = serde_json::to_string(&status).unwrap();\n2101\t assert!(json.contains(\"\\\"in_progress\\\":true\"));\n2102\t }\n2103\t\n2104\t #[tokio::test]\n2105\t async fn test_rebalancer_status() {\n2106\t let topo = Arc::new(RwLock::new(test_topology()));\n2107\t let config = RebalancerConfig::default();\n2108\t let migration_config = MigrationConfig::default();\n2109\t\n2110\t let rebalancer = Rebalancer::new(config, topo, migration_config);\n2111\t\n2112\t let status = rebalancer.status().await;\n2113\t assert!(!status.in_progress);\n2114\t assert!(status.operations.is_empty());\n2115\t }\n2116\t\n2117\t #[tokio::test]\n2118\t async fn test_add_node_creates_operation() {\n2119\t let topo = Arc::new(RwLock::new(test_topology()));\n2120\t let config = RebalancerConfig::default();\n2121\t let migration_config = MigrationConfig::default();\n2122\t\n2123\t let rebalancer = Rebalancer::new(config, topo.clone(), migration_config);\n2124\t\n2125\t let request = AddNodeRequest {\n2126\t id: \"node-4\".into(),\n2127\t address: \"http://node-4:7700\".into(),\n2128\t replica_group: 0,\n2129\t };\n2130\t\n2131\t let result = rebalancer.add_node(request).await.unwrap();\n2132\t assert!(result.id > 0);\n2133\t assert!(result.migrations_count > 0);\n2134\t\n2135\t // Check node was added\n2136\t let topo_read = topo.read().await;\n2137\t assert!(topo_read.node(&TopologyNodeId::new(\"node-4\".into())).is_some());\n2138\t }\n2139\t\n2140\t #[tokio::test]\n2141\t async fn test_add_duplicate_node_fails() {\n2142\t let topo = Arc::new(RwLock::new(test_topology()));\n2143\t let config = RebalancerConfig::default();\n2144\t let migration_config = MigrationConfig::default();\n2145\t\n2146\t let rebalancer = Rebalancer::new(config, topo, migration_config);\n2147\t\n2148\t let request = AddNodeRequest {\n2149\t id: \"node-0\".into(), // Already exists\n2150\t address: \"http://node-0:7700\".into(),\n2151\t replica_group: 0,\n2152\t };\n2153\t\n2154\t let result = rebalancer.add_node(request).await;\n2155\t assert!(result.is_err());\n2156\t }\n2157\t\n2158\t #[tokio::test]\n2159\t async fn test_remove_last_node_fails() {\n2160\t let mut topo = Topology::new(64, 1, 1);\n2161\t topo.add_node(Node::new(\n2162\t TopologyNodeId::new(\"solo\".into()),\n2163\t \"http://solo:7700\".into(),\n2164\t 0,\n2165\t ));\n2166\t let topo = Arc::new(RwLock::new(topo));\n2167\t\n2168\t let config = RebalancerConfig::default();\n2169\t let migration_config = MigrationConfig::default();\n2170\t\n2171\t let rebalancer = Rebalancer::new(config, topo, migration_config);\n2172\t\n2173\t let request = RemoveNodeRequest {\n2174\t node_id: \"solo\".into(),\n2175\t force: false,\n2176\t };\n2177\t\n2178\t let result = rebalancer.remove_node(request).await;\n2179\t assert!(matches!(result, Err(RebalancerError::CannotRemoveLastNode)));\n2180\t }\n2181\t\n2182\t #[tokio::test]\n2183\t async fn test_handle_node_failure() {\n2184\t let topo = Arc::new(RwLock::new(test_topology()));\n2185\t let config = RebalancerConfig::default();\n2186\t let migration_config = MigrationConfig::default();\n2187\t\n2188\t let rebalancer = Rebalancer::new(config, topo.clone(), migration_config);\n2189\t\n2190\t let result = rebalancer.handle_node_failure(\"node-0\").await.unwrap();\n2191\t assert!(matches!(\n2192\t result.message.as_str(),\n2193\t \"Node node-0 marked as failed\"\n2194\t ));\n2195\t\n2196\t // Check node was marked failed\n2197\t let topo_read = topo.read().await;\n2198\t let node = topo_read.node(&TopologyNodeId::new(\"node-0\".into())).unwrap();\n2199\t assert_eq!(node.status, NodeStatus::Failed);\n2200\t }\n2201\t\n2202\t #[test]\n2203\t fn test_shard_filter() {\n2204\t let executor = HttpMigrationExecutor::new(\"test-key\".to_string(), 5000);\n2205\t assert_eq!(executor.shard_filter(42), \"_miroir_shard = 42\");\n2206\t assert_eq!(executor.shard_filter(0), \"_miroir_shard = 0\");\n2207\t }\n2208\t\n2209\t #[test]\n2210\t fn test_http_migration_executor_new() {\n2211\t let executor = HttpMigrationExecutor::new(\"master-key\".to_string(), 10000);\n2212\t assert_eq!(executor.node_master_key, \"master-key\");\n2213\t }\n2214\t}\n2215\t"}]},"parent_tool_use_id":null,"session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","uuid":"b868c4c8-60f5-40b7-a680-cd4eb4ed8f5b","timestamp":"2026-05-23T05:58:47.923Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/crates/miroir-core/src/rebalancer.rs","content":"//! Cluster rebalancer for elastic topology operations.\n//!\n//! Implements plan §2 topology changes and §4 rebalancer:\n//! - Node addition (within a group)\n//! - Replica-group addition\n//! - Node removal (drain)\n//! - Group removal\n//! - Unplanned node failure handling\n//!\n//! The rebalancer coordinates shard migrations using the migration coordinator\n//! and provides admin API endpoints for topology operations.\n\nuse crate::migration::{MigrationCoordinator, MigrationId, MigrationConfig, MigrationError, NodeId as MigrationNodeId, ShardId};\nuse crate::task_store::TaskStore;\nuse crate::topology::{Node, NodeId as TopologyNodeId, NodeStatus, Topology};\nuse crate::router::{assign_shard_in_group, score};\nuse serde::{Deserialize, Serialize};\nuse std::collections::HashMap;\nuse std::sync::Arc;\nuse std::time::{Duration, Instant};\nuse tokio::sync::RwLock;\nuse tracing::{debug, error, info, instrument, warn};\n\n/// Callback type for recording rebalancer metrics.\npub type RebalancerMetricsCallback = Arc;\n\n/// Convert a topology NodeId to a migration NodeId.\nfn topo_to_migration_node_id(id: &TopologyNodeId) -> MigrationNodeId {\n MigrationNodeId(id.as_str().to_string())\n}\n\n/// Convert a migration NodeId to a topology NodeId.\nfn migration_to_topo_node_id(id: &MigrationNodeId) -> TopologyNodeId {\n TopologyNodeId::new(id.0.clone())\n}\n\n/// Configuration for the rebalancer.\n#[derive(Debug, Clone, Serialize, Deserialize)]\npub struct RebalancerConfig {\n /// Maximum concurrent shard migrations.\n pub max_concurrent_migrations: u32,\n /// Timeout for a single migration operation.\n pub migration_timeout_s: u64,\n /// Whether to automatically rebalance on node recovery.\n pub auto_rebalance_on_recovery: bool,\n /// Batch size for document migration.\n pub migration_batch_size: u32,\n /// Delay between migration batches (ms).\n pub migration_batch_delay_ms: u64,\n}\n\nimpl Default for RebalancerConfig {\n fn default() -> Self {\n Self {\n max_concurrent_migrations: 4,\n migration_timeout_s: 3600,\n auto_rebalance_on_recovery: true,\n migration_batch_size: 1000,\n migration_batch_delay_ms: 100,\n }\n }\n}\n\n/// Type of topology operation.\n#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]\n#[serde(rename_all = \"snake_case\")]\npub enum TopologyOperationType {\n /// Adding a new node to an existing replica group.\n AddNode,\n /// Removing a node from a replica group.\n RemoveNode,\n /// Draining a node before removal.\n DrainNode,\n /// Adding a new replica group.\n AddReplicaGroup,\n /// Removing an entire replica group.\n RemoveReplicaGroup,\n /// Handling a failed node.\n NodeFailure,\n}\n\n/// Status of a topology operation.\n#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]\n#[serde(rename_all = \"snake_case\")]\npub enum TopologyOperationStatus {\n /// Operation is pending.\n Pending,\n /// Operation is in progress.\n InProgress,\n /// Operation completed successfully.\n Complete,\n /// Operation failed.\n Failed,\n /// Operation was cancelled.\n Cancelled,\n}\n\n/// A topology operation (node/group add/remove/drain).\n#[derive(Debug, Clone, Serialize, Deserialize)]\npub struct TopologyOperation {\n /// Unique operation ID.\n pub id: u64,\n /// Type of operation.\n pub op_type: TopologyOperationType,\n /// Current status.\n pub status: TopologyOperationStatus,\n /// Target node ID (for node operations).\n pub target_node: Option,\n /// Target replica group ID (for group operations).\n pub target_group: Option,\n /// Shard migrations in progress for this operation.\n pub migrations: Vec,\n /// Start time.\n pub started_at: Option,\n /// Completion time.\n pub completed_at: Option,\n /// Error message if failed.\n pub error: Option,\n}\n\n/// Result of a topology operation request.\n#[derive(Debug, Clone, Serialize, Deserialize)]\npub struct TopologyOperationResult {\n /// Operation ID.\n pub id: u64,\n /// Status message.\n pub message: String,\n /// Number of shard migrations initiated.\n pub migrations_count: usize,\n}\n\n/// Status of all ongoing topology operations.\n#[derive(Debug, Clone, Serialize, Deserialize)]\npub struct RebalanceStatus {\n /// Whether a rebalance is currently in progress.\n pub in_progress: bool,\n /// Active topology operations.\n pub operations: Vec,\n /// Active migration details.\n pub migrations: HashMap,\n}\n\n/// Status of a single migration.\n#[derive(Debug, Clone, Serialize, Deserialize)]\npub struct MigrationStatus {\n /// Migration ID.\n pub id: u64,\n /// New node ID.\n pub new_node: String,\n /// Replica group.\n pub replica_group: u32,\n /// Current phase.\n pub phase: String,\n /// Affected shards count.\n pub shards_count: usize,\n /// Completed shards count.\n pub completed_count: usize,\n}\n\n/// Request to add a node to a replica group.\n#[derive(Debug, Clone, Deserialize)]\npub struct AddNodeRequest {\n /// Node ID.\n pub id: String,\n /// Node address.\n pub address: String,\n /// Replica group to join.\n pub replica_group: u32,\n}\n\n/// Request to remove a node from the cluster.\n#[derive(Debug, Clone, Deserialize)]\npub struct RemoveNodeRequest {\n /// Node ID to remove.\n pub node_id: String,\n /// Force removal without draining (dangerous).\n pub force: bool,\n}\n\n/// Request to drain a node (prepare for removal).\n#[derive(Debug, Clone, Deserialize)]\npub struct DrainNodeRequest {\n /// Node ID to drain.\n pub node_id: String,\n}\n\n/// Request to add a replica group.\n#[derive(Debug, Clone, Deserialize)]\npub struct AddReplicaGroupRequest {\n /// Group ID.\n pub group_id: u32,\n /// Initial nodes in the group.\n pub nodes: Vec,\n}\n\n/// Node specification for group addition.\n#[derive(Debug, Clone, Deserialize)]\npub struct GroupNodeSpec {\n /// Node ID.\n pub id: String,\n /// Node address.\n pub address: String,\n}\n\n/// Request to remove a replica group.\n#[derive(Debug, Clone, Deserialize)]\npub struct RemoveReplicaGroupRequest {\n /// Group ID to remove.\n pub group_id: u32,\n /// Force removal without draining.\n pub force: bool,\n}\n\n/// Rebalancer error types.\n#[derive(Debug, thiserror::Error)]\npub enum RebalancerError {\n #[error(\"node not found: {0}\")]\n NodeNotFound(String),\n\n #[error(\"replica group not found: {0}\")]\n GroupNotFound(u32),\n\n #[error(\"operation already in progress for node: {0}\")]\n OperationInProgress(String),\n\n #[error(\"invalid topology state: {0}\")]\n InvalidState(String),\n\n #[error(\"migration error: {0}\")]\n MigrationError(#[from] MigrationError),\n\n #[error(\"timeout: {0}\")]\n Timeout(String),\n\n #[error(\"cannot remove last node in group\")]\n CannotRemoveLastNode,\n\n #[error(\"replica group {0} is not empty\")]\n GroupNotEmpty(u32),\n}\n\n/// Migration executor: performs the actual document migration between nodes.\n///\n/// This trait allows the rebalancer core to remain agnostic to the HTTP client\n/// implementation while still performing actual migrations.\n#[async_trait::async_trait]\npub trait MigrationExecutor: Send + Sync {\n /// Fetch documents from a source node for a specific shard.\n async fn fetch_documents(\n &self,\n source_node: &str,\n source_address: &str,\n index_uid: &str,\n shard_id: u32,\n limit: u32,\n offset: u32,\n ) -> std::result::Result<(Vec, u64), String>;\n\n /// Write documents to a target node.\n async fn write_documents(\n &self,\n target_node: &str,\n target_address: &str,\n index_uid: &str,\n documents: Vec,\n ) -> std::result::Result<(), String>;\n\n /// Delete documents from a node by shard filter.\n async fn delete_shard(\n &self,\n node: &str,\n node_address: &str,\n index_uid: &str,\n shard_id: u32,\n ) -> std::result::Result<(), String>;\n}\n\n/// Rebalancer metrics for Prometheus emission.\n#[derive(Debug, Clone, Default)]\npub struct RebalancerMetrics {\n /// Total number of documents migrated.\n pub documents_migrated_total: u64,\n /// Number of currently active migrations.\n pub active_migrations: u64,\n /// Start time of the current rebalance operation.\n pub rebalance_start_time: Option,\n}\n\nimpl RebalancerMetrics {\n /// Record that documents were migrated.\n pub fn record_documents_migrated(&mut self, count: u64) {\n self.documents_migrated_total += count;\n }\n\n /// Increment active migrations count.\n pub fn increment_active_migrations(&mut self) {\n self.active_migrations += 1;\n }\n\n /// Decrement active migrations count.\n pub fn decrement_active_migrations(&mut self) {\n self.active_migrations = self.active_migrations.saturating_sub(1);\n }\n\n /// Start a rebalance operation.\n pub fn start_rebalance(&mut self) {\n self.rebalance_start_time = Some(Instant::now());\n }\n\n /// End a rebalance operation and return duration in seconds.\n pub fn end_rebalance(&mut self) -> f64 {\n self.rebalance_start_time\n .take()\n .map(|t| t.elapsed().as_secs_f64())\n .unwrap_or(0.0)\n }\n\n /// Get the current rebalance duration in seconds.\n pub fn current_duration_secs(&self) -> f64 {\n self.rebalance_start_time\n .map(|t| t.elapsed().as_secs_f64())\n .unwrap_or(0.0)\n }\n}\n\n/// The cluster rebalancer orchestrates topology changes.\npub struct Rebalancer {\n config: RebalancerConfig,\n topology: Arc>,\n migration_coordinator: Arc>,\n operations: Arc>>,\n next_op_id: Arc,\n active_migrations: Arc>>, // migration -> operation ID\n migration_executor: Option>,\n /// Metrics for rebalancer operations.\n pub metrics: Arc>,\n /// Task store for leader lease (P4.1 background worker).\n task_store: Option>,\n /// This pod's ID for leader election.\n pod_id: Option,\n /// Leader lease scope prefix.\n leader_scope: String,\n /// Callback for recording Prometheus metrics.\n metrics_callback: Option,\n}\n\nimpl Rebalancer {\n /// Create a new rebalancer.\n pub fn new(\n config: RebalancerConfig,\n topology: Arc>,\n migration_config: MigrationConfig,\n ) -> Self {\n let coordinator = Arc::new(RwLock::new(MigrationCoordinator::new(migration_config)));\n\n Self {\n config,\n topology,\n migration_coordinator: coordinator,\n operations: Arc::new(RwLock::new(HashMap::new())),\n next_op_id: Arc::new(std::sync::atomic::AtomicU64::new(1)),\n active_migrations: Arc::new(RwLock::new(HashMap::new())),\n migration_executor: None,\n metrics: Arc::new(RwLock::new(RebalancerMetrics::default())),\n task_store: None,\n pod_id: None,\n leader_scope: \"rebalance:global\".to_string(),\n metrics_callback: None,\n }\n }\n\n /// Set the task store for leader lease (P4.1 background worker).\n pub fn with_task_store(mut self, task_store: Arc) -> Self {\n self.task_store = Some(task_store);\n self\n }\n\n /// Set the pod ID for leader election.\n pub fn with_pod_id(mut self, pod_id: String) -> Self {\n self.pod_id = Some(pod_id);\n self\n }\n\n /// Set the leader lease scope.\n pub fn with_leader_scope(mut self, scope: String) -> Self {\n self.leader_scope = scope;\n self\n }\n\n /// Set the metrics callback for Prometheus emission.\n pub fn with_metrics_callback(mut self, callback: RebalancerMetricsCallback) -> Self {\n self.metrics_callback = Some(callback);\n self\n }\n\n /// Set the migration executor (provides HTTP client for actual migrations).\n pub fn with_migration_executor(mut self, executor: Arc) -> Self {\n self.migration_executor = Some(executor);\n self\n }\n\n /// Emit a metric via the metrics callback (if configured).\n fn emit_metric(&self, name: &str, value: f64) {\n if let Some(ref callback) = self.metrics_callback {\n callback(name, value);\n }\n }\n\n /// Run the background rebalancer worker (P4.1).\n ///\n /// This method runs in a loop, periodically checking for topology changes\n /// and triggering rebalancing as needed. Uses leader lease to ensure only\n /// one pod runs the rebalancer at a time.\n #[instrument(skip_all, fields(pod_id = ?self.pod_id))]\n pub async fn run_background(&self) -> Result<(), RebalancerError> {\n let Some(ref task_store) = self.task_store else {\n return Err(RebalancerError::InvalidState(\n \"task_store required for background worker\".into(),\n ));\n };\n\n let Some(ref pod_id) = self.pod_id else {\n return Err(RebalancerError::InvalidState(\n \"pod_id required for background worker\".into(),\n ));\n };\n\n let check_interval = Duration::from_millis(5000); // Check every 5 seconds\n let mut interval = tokio::time::interval(check_interval);\n let mut leader_lease_interval = tokio::time::interval(Duration::from_secs(3));\n\n info!(\n config = ?self.config,\n \"rebalancer background worker started\"\n );\n\n loop {\n tokio::select! {\n _ = interval.tick() => {\n if self.is_leader(task_store, pod_id).await {\n if let Err(e) = self.check_and_rebalance().await {\n error!(error = %e, \"background rebalance check failed\");\n }\n }\n }\n _ = leader_lease_interval.tick() => {\n if self.is_leader(task_store, pod_id).await {\n self.renew_leader_lease(task_store, pod_id).await;\n }\n }\n }\n }\n }\n\n /// Check if this pod is the leader for rebalancing.\n async fn is_leader(&self, task_store: &Arc, pod_id: &str) -> bool {\n let now = now_ms() as i64;\n let lease_ttl = now + 15000; // 15 second TTL\n\n task_store\n .try_acquire_leader_lease(&self.leader_scope, pod_id, lease_ttl, now)\n .unwrap_or(false)\n }\n\n /// Renew the leader lease.\n async fn renew_leader_lease(&self, task_store: &Arc, pod_id: &str) {\n let now = now_ms() as i64;\n let lease_ttl = now + 15000; // 15 second TTL\n\n let _ = task_store\n .renew_leader_lease(&self.leader_scope, pod_id, lease_ttl);\n }\n\n /// Check for topology changes and trigger rebalancing if needed.\n async fn check_and_rebalance(&self) -> Result<(), RebalancerError> {\n debug!(\"checking for topology changes\");\n\n let topology = self.topology.read().await;\n\n // Check for nodes in Joining state\n let joining_nodes: Vec<_> = topology\n .nodes()\n .filter(|n| n.status == NodeStatus::Joining)\n .map(|n| (n.id.clone(), n.replica_group, n.address.clone()))\n .collect();\n\n // Check for nodes in Draining state\n let draining_nodes: Vec<_> = topology\n .nodes()\n .filter(|n| n.status == NodeStatus::Draining)\n .map(|n| (n.id.clone(), n.replica_group))\n .collect();\n\n // Check for nodes in Failed state\n let failed_nodes: Vec<_> = topology\n .nodes()\n .filter(|n| n.status == NodeStatus::Failed)\n .map(|n| (n.id.clone(), n.replica_group))\n .collect();\n\n // Drop topology read lock before starting operations\n drop(topology);\n\n // Trigger rebalance for joining nodes\n for (node_id, replica_group, address) in joining_nodes {\n info!(node_id = %node_id, replica_group, \"detected joining node\");\n\n // Check if there's already an operation in progress for this node\n let ops = self.operations.read().await;\n let already_in_progress = ops.values().any(|o| {\n o.target_node.as_ref() == Some(&node_id.as_str().to_string())\n && o.status == TopologyOperationStatus::InProgress\n });\n drop(ops);\n\n if !already_in_progress {\n let request = AddNodeRequest {\n id: node_id.as_str().to_string(),\n address,\n replica_group,\n };\n if let Err(e) = self.add_node(request).await {\n warn!(error = %e, \"failed to start rebalance for joining node\");\n }\n }\n }\n\n // Trigger rebalance for draining nodes\n for (node_id, replica_group) in draining_nodes {\n info!(node_id = %node_id, replica_group, \"detected draining node\");\n\n let ops = self.operations.read().await;\n let already_in_progress = ops.values().any(|o| {\n o.target_node.as_ref() == Some(&node_id.as_str().to_string())\n && matches!(\n o.op_type,\n TopologyOperationType::DrainNode | TopologyOperationType::RemoveNode\n )\n && o.status == TopologyOperationStatus::InProgress\n });\n drop(ops);\n\n if !already_in_progress {\n let request = DrainNodeRequest {\n node_id: node_id.as_str().to_string(),\n };\n if let Err(e) = self.drain_node(request).await {\n warn!(error = %e, \"failed to start rebalance for draining node\");\n }\n }\n }\n\n // Handle failed nodes\n for (node_id, replica_group) in failed_nodes {\n info!(node_id = %node_id, replica_group, \"detected failed node\");\n\n let ops = self.operations.read().await;\n let already_handled = ops.values().any(|o| {\n o.target_node.as_ref() == Some(&node_id.as_str().to_string())\n && o.op_type == TopologyOperationType::NodeFailure\n });\n drop(ops);\n\n if !already_handled {\n if let Err(e) = self.handle_node_failure(node_id.as_str()).await {\n warn!(error = %e, \"failed to handle node failure\");\n }\n }\n }\n\n Ok(())\n }\n\n /// Get current rebalance status.\n pub async fn status(&self) -> RebalanceStatus {\n let ops = self.operations.read().await;\n let coordinator = self.migration_coordinator.read().await;\n\n let in_progress = ops.values().any(|o| o.status == TopologyOperationStatus::InProgress);\n\n let mut migrations: HashMap = HashMap::new();\n for op in ops.values() {\n for &mid in &op.migrations {\n if let Some(state) = coordinator.get_state(mid) {\n let key = format!(\"{}\", mid);\n let status = MigrationStatus {\n id: mid.0,\n new_node: state.new_node.to_string(),\n replica_group: state.replica_group,\n phase: state.phase.to_string(),\n shards_count: state.affected_shards.len(),\n completed_count: state\n .affected_shards\n .values()\n .filter(|s| matches!(s, crate::migration::ShardMigrationState::Active))\n .count(),\n };\n migrations.insert(key, status);\n }\n }\n }\n\n RebalanceStatus {\n in_progress,\n operations: ops.values().cloned().collect(),\n migrations,\n }\n }\n\n /// Add a node to a replica group.\n pub async fn add_node(\n &self,\n request: AddNodeRequest,\n ) -> Result {\n info!(\n node_id = %request.id,\n group = request.replica_group,\n \"starting node addition\"\n );\n\n // Check if node already exists\n {\n let topo = self.topology.read().await;\n if topo.node(&TopologyNodeId::new(request.id.clone())).is_some() {\n return Err(RebalancerError::InvalidState(format!(\n \"node {} already exists\",\n request.id\n )));\n }\n }\n\n // Create operation record\n let op_id = self.next_op_id.fetch_add(1, std::sync::atomic::Ordering::SeqCst);\n\n // Add node to topology in Joining state\n {\n let mut topo = self.topology.write().await;\n let group_count = topo.groups().count() as u32;\n if request.replica_group >= group_count {\n return Err(RebalancerError::GroupNotFound(request.replica_group));\n }\n\n let node = Node::new(\n TopologyNodeId::new(request.id.clone()),\n request.address.clone(),\n request.replica_group,\n );\n topo.add_node(node);\n }\n\n // Compute affected shards (shards that will move to new node)\n let affected_shards = self.compute_shard_moves_for_new_node(&request.id, request.replica_group).await?;\n\n // Create migration for each affected shard\n let mut migrations = Vec::new();\n {\n let mut coordinator = self.migration_coordinator.write().await;\n\n for (shard, old_owner) in affected_shards {\n let mut old_owners = HashMap::new();\n old_owners.insert(shard, topo_to_migration_node_id(&old_owner));\n\n let mid = coordinator.begin_migration(\n topo_to_migration_node_id(&TopologyNodeId::new(request.id.clone())),\n request.replica_group,\n old_owners,\n )?;\n\n // Start dual-write\n coordinator.begin_dual_write(mid)?;\n\n // Track migration\n {\n let mut active = self.active_migrations.write().await;\n active.insert(mid, op_id);\n }\n\n migrations.push(mid);\n }\n }\n\n // Record operation\n let node_id_for_result = request.id.clone();\n let migrations_count = migrations.len();\n let operation = TopologyOperation {\n id: op_id,\n op_type: TopologyOperationType::AddNode,\n status: TopologyOperationStatus::InProgress,\n target_node: Some(request.id),\n target_group: Some(request.replica_group),\n migrations: migrations.clone(),\n started_at: Some(now_ms()),\n completed_at: None,\n error: None,\n };\n\n {\n let mut ops = self.operations.write().await;\n ops.insert(op_id, operation);\n }\n\n // Start metrics tracking\n {\n let mut metrics = self.metrics.write().await;\n metrics.start_rebalance();\n }\n\n // Start background migration task\n let topo_arc = self.topology.clone();\n let coord_arc = self.migration_coordinator.clone();\n let ops_arc = self.operations.clone();\n let active_arc = self.active_migrations.clone();\n let config = self.config.clone();\n let executor = self.migration_executor.clone();\n let metrics_arc = self.metrics.clone();\n\n tokio::spawn(async move {\n if let Err(e) = run_migration_task(\n topo_arc,\n coord_arc,\n ops_arc,\n active_arc,\n op_id,\n migrations,\n config,\n executor,\n metrics_arc,\n )\n .await\n {\n error!(error = %e, op_id = op_id, \"migration task failed\");\n }\n });\n\n Ok(TopologyOperationResult {\n id: op_id,\n message: format!(\n \"Node {} addition started with {} shard migrations\",\n node_id_for_result,\n migrations_count\n ),\n migrations_count,\n })\n }\n\n /// Drain a node (prepare for removal).\n pub async fn drain_node(\n &self,\n request: DrainNodeRequest,\n ) -> Result {\n info!(node_id = %request.node_id, \"starting node drain\");\n\n // Check if node exists\n let node_id = TopologyNodeId::new(request.node_id.clone());\n let (node_status, replica_group) = {\n let topo = self.topology.read().await;\n let node = topo.node(&node_id).ok_or_else(|| {\n RebalancerError::NodeNotFound(request.node_id.clone())\n })?;\n\n // Check if this is the last node in the group\n let group = topo\n .groups()\n .find(|g| g.id == node.replica_group)\n .ok_or_else(|| RebalancerError::GroupNotFound(node.replica_group))?;\n\n if group.nodes().len() <= 1 {\n return Err(RebalancerError::CannotRemoveLastNode);\n }\n\n (node.status, node.replica_group)\n };\n\n if node_status == NodeStatus::Draining {\n return Err(RebalancerError::OperationInProgress(\n request.node_id.clone(),\n ));\n }\n\n // Create operation record\n let op_id = self.next_op_id.fetch_add(1, std::sync::atomic::Ordering::SeqCst);\n\n // Mark node as draining\n {\n let mut topo = self.topology.write().await;\n if let Some(node) = topo.node_mut(&node_id) {\n node.status = NodeStatus::Draining;\n }\n }\n\n // Compute shard destinations (where each shard goes)\n let shard_destinations = self.compute_shard_destinations_for_drain(&request.node_id, replica_group).await?;\n\n // Create migrations for each shard\n let mut migrations = Vec::new();\n {\n let mut coordinator = self.migration_coordinator.write().await;\n\n for (shard, dest_node) in shard_destinations {\n let mid = coordinator.begin_migration(\n topo_to_migration_node_id(&dest_node),\n replica_group,\n [(shard, topo_to_migration_node_id(&node_id))].into_iter().collect(),\n )?;\n\n coordinator.begin_dual_write(mid)?;\n\n {\n let mut active = self.active_migrations.write().await;\n active.insert(mid, op_id);\n }\n\n migrations.push(mid);\n }\n }\n\n // Record operation\n let operation = TopologyOperation {\n id: op_id,\n op_type: TopologyOperationType::DrainNode,\n status: TopologyOperationStatus::InProgress,\n target_node: Some(request.node_id.clone()),\n target_group: Some(replica_group),\n migrations: migrations.clone(),\n started_at: Some(now_ms()),\n completed_at: None,\n error: None,\n };\n\n {\n let mut ops = self.operations.write().await;\n ops.insert(op_id, operation);\n }\n\n // Start metrics tracking\n {\n let mut metrics = self.metrics.write().await;\n metrics.start_rebalance();\n }\n\n // Start background migration task\n let migrations_count = migrations.len();\n let topo_arc = self.topology.clone();\n let coord_arc = self.migration_coordinator.clone();\n let ops_arc = self.operations.clone();\n let active_arc = self.active_migrations.clone();\n let config = self.config.clone();\n let drain_node_id = request.node_id.clone();\n let executor = self.migration_executor.clone();\n let metrics_arc = self.metrics.clone();\n\n tokio::spawn(async move {\n if let Err(e) = run_drain_task(\n topo_arc,\n coord_arc,\n ops_arc,\n active_arc,\n op_id,\n migrations,\n config,\n drain_node_id,\n executor,\n metrics_arc,\n )\n .await\n {\n error!(error = %e, op_id = op_id, \"drain task failed\");\n }\n });\n\n Ok(TopologyOperationResult {\n id: op_id,\n message: format!(\n \"Node {} drain started with {} shard migrations\",\n request.node_id,\n migrations_count\n ),\n migrations_count,\n })\n }\n\n /// Remove a node from the cluster (after drain).\n pub async fn remove_node(\n &self,\n request: RemoveNodeRequest,\n ) -> Result {\n info!(node_id = %request.node_id, force = request.force, \"starting node removal\");\n\n let node_id = TopologyNodeId::new(request.node_id.clone());\n\n // Check node state\n let node_status = {\n let topo = self.topology.read().await;\n let node = topo.node(&node_id).ok_or_else(|| {\n RebalancerError::NodeNotFound(request.node_id.clone())\n })?;\n\n // Check if this is the last node in the group\n let group = topo\n .groups()\n .find(|g| g.id == node.replica_group)\n .ok_or_else(|| RebalancerError::GroupNotFound(node.replica_group))?;\n\n if group.nodes().len() <= 1 {\n return Err(RebalancerError::CannotRemoveLastNode);\n }\n\n node.status\n };\n\n if !request.force && node_status != NodeStatus::Draining {\n return Err(RebalancerError::InvalidState(format!(\n \"node {} is not in draining state (current: {:?}), use force=true to bypass\",\n request.node_id, node_status\n )));\n }\n\n // Create operation record\n let op_id = self.next_op_id.fetch_add(1, std::sync::atomic::Ordering::SeqCst);\n\n // Remove node from topology\n {\n let mut topo = self.topology.write().await;\n topo.remove_node(&node_id);\n }\n\n // Record operation\n let operation = TopologyOperation {\n id: op_id,\n op_type: TopologyOperationType::RemoveNode,\n status: TopologyOperationStatus::Complete,\n target_node: Some(request.node_id.clone()),\n target_group: None,\n migrations: Vec::new(),\n started_at: Some(now_ms()),\n completed_at: Some(now_ms()),\n error: None,\n };\n\n {\n let mut ops = self.operations.write().await;\n ops.insert(op_id, operation);\n }\n\n Ok(TopologyOperationResult {\n id: op_id,\n message: format!(\"Node {} removed from cluster\", request.node_id),\n migrations_count: 0,\n })\n }\n\n /// Add a replica group.\n pub async fn add_replica_group(\n &self,\n request: AddReplicaGroupRequest,\n ) -> Result {\n info!(group_id = request.group_id, node_count = request.nodes.len(), \"starting replica group addition\");\n\n // Check if group already exists\n {\n let topo = self.topology.read().await;\n if topo.groups().any(|g| g.id == request.group_id) {\n return Err(RebalancerError::InvalidState(format!(\n \"replica group {} already exists\",\n request.group_id\n )));\n }\n }\n\n // Create operation record\n let op_id = self.next_op_id.fetch_add(1, std::sync::atomic::Ordering::SeqCst);\n\n // Add nodes to topology\n let node_ids: Vec = request.nodes.iter().map(|n| n.id.clone()).collect();\n for node_spec in &request.nodes {\n let mut topo = self.topology.write().await;\n let node = Node::new(\n TopologyNodeId::new(node_spec.id.clone()),\n node_spec.address.clone(),\n request.group_id,\n );\n topo.add_node(node);\n }\n\n // For replica groups, we don't migrate data - the new group will sync from existing groups\n // This is handled by the replication mechanism\n\n // Record operation\n let operation = TopologyOperation {\n id: op_id,\n op_type: TopologyOperationType::AddReplicaGroup,\n status: TopologyOperationStatus::Complete,\n target_node: None,\n target_group: Some(request.group_id),\n migrations: Vec::new(),\n started_at: Some(now_ms()),\n completed_at: Some(now_ms()),\n error: None,\n };\n\n {\n let mut ops = self.operations.write().await;\n ops.insert(op_id, operation);\n }\n\n Ok(TopologyOperationResult {\n id: op_id,\n message: format!(\n \"Replica group {} added with {} nodes\",\n request.group_id,\n node_ids.len()\n ),\n migrations_count: 0,\n })\n }\n\n /// Remove a replica group.\n pub async fn remove_replica_group(\n &self,\n request: RemoveReplicaGroupRequest,\n ) -> Result {\n info!(group_id = request.group_id, force = request.force, \"starting replica group removal\");\n\n // Check if group exists and is empty\n {\n let topo = self.topology.read().await;\n let group = topo.groups().find(|g| g.id == request.group_id);\n\n let Some(grp) = group else {\n return Err(RebalancerError::GroupNotFound(request.group_id));\n };\n\n if !request.force && !grp.nodes().is_empty() {\n return Err(RebalancerError::GroupNotEmpty(request.group_id));\n }\n\n // Check if this is the last group\n if topo.groups().count() <= 1 {\n return Err(RebalancerError::InvalidState(\n \"cannot remove the last replica group\".into(),\n ));\n }\n }\n\n // Create operation record\n let op_id = self.next_op_id.fetch_add(1, std::sync::atomic::Ordering::SeqCst);\n\n // Remove group from topology (this removes all nodes in the group)\n {\n let mut topo = self.topology.write().await;\n topo.remove_group(request.group_id);\n }\n\n // Record operation\n let operation = TopologyOperation {\n id: op_id,\n op_type: TopologyOperationType::RemoveReplicaGroup,\n status: TopologyOperationStatus::Complete,\n target_node: None,\n target_group: Some(request.group_id),\n migrations: Vec::new(),\n started_at: Some(now_ms()),\n completed_at: Some(now_ms()),\n error: None,\n };\n\n {\n let mut ops = self.operations.write().await;\n ops.insert(op_id, operation);\n }\n\n Ok(TopologyOperationResult {\n id: op_id,\n message: format!(\"Replica group {} removed from cluster\", request.group_id),\n migrations_count: 0,\n })\n }\n\n /// Handle a node failure.\n pub async fn handle_node_failure(\n &self,\n node_id: &str,\n ) -> Result {\n warn!(node_id = %node_id, \"handling node failure\");\n\n let node_id_obj = TopologyNodeId::new(node_id.to_string());\n\n // Mark node as failed\n let replica_group = {\n let mut topo = self.topology.write().await;\n let node = topo.node_mut(&node_id_obj).ok_or_else(|| {\n RebalancerError::NodeNotFound(node_id.to_string())\n })?;\n\n node.status = NodeStatus::Failed;\n node.replica_group\n };\n\n // Create operation record\n let op_id = self.next_op_id.fetch_add(1, std::sync::atomic::Ordering::SeqCst);\n\n // TODO: Schedule background replication to restore RF if needed\n // For now, just record the failure\n\n let operation = TopologyOperation {\n id: op_id,\n op_type: TopologyOperationType::NodeFailure,\n status: TopologyOperationStatus::Complete,\n target_node: Some(node_id.to_string()),\n target_group: Some(replica_group),\n migrations: Vec::new(),\n started_at: Some(now_ms()),\n completed_at: Some(now_ms()),\n error: None,\n };\n\n {\n let mut ops = self.operations.write().await;\n ops.insert(op_id, operation);\n }\n\n Ok(TopologyOperationResult {\n id: op_id,\n message: format!(\"Node {} marked as failed\", node_id),\n migrations_count: 0,\n })\n }\n\n /// Compute which shards should move to a new node.\n /// Returns shard -> old_owner mapping for shards that will move.\n ///\n /// For each shard where the new node enters the assignment, we select one\n /// of the old owners as the migration source. If the new node displaced\n /// an old owner, we use that node; otherwise we use the lowest-scored old owner.\n async fn compute_shard_moves_for_new_node(\n &self,\n new_node_id: &str,\n replica_group: u32,\n ) -> Result, RebalancerError> {\n let topo = self.topology.read().await;\n\n let new_node_id = TopologyNodeId::new(new_node_id.to_string());\n let rf = topo.rf();\n\n // Find the target group\n let group = topo\n .groups()\n .find(|g| g.id == replica_group)\n .ok_or_else(|| RebalancerError::GroupNotFound(replica_group))?;\n\n let existing_nodes: Vec<_> = group.nodes().iter().cloned().collect();\n let mut affected_shards = Vec::new();\n\n // For each shard, check if the new node is in the new assignment\n for shard_id in 0..topo.shards {\n let old_assignment: Vec<_> = assign_shard_in_group(shard_id, &existing_nodes, rf)\n .into_iter()\n .collect();\n\n // New assignment with the new node included\n let all_nodes: Vec<_> = existing_nodes\n .iter()\n .cloned()\n .chain(std::iter::once(new_node_id.clone()))\n .collect();\n let new_assignment: Vec<_> = assign_shard_in_group(shard_id, &all_nodes, rf)\n .into_iter()\n .collect();\n\n // Check if new node is in the new assignment\n if !new_assignment.contains(&new_node_id) {\n continue;\n }\n\n // Find the source node for migration\n // Priority 1: Use the displaced node (if any)\n // Priority 2: Use the lowest-scored old owner (load balancing)\n let source_node = if let Some(displaced) = old_assignment.iter()\n .find(|n| !new_assignment.contains(n)) {\n // An old node was displaced - use it as source\n displaced.clone()\n } else {\n // No displacement - pick lowest-scored old owner\n // Find the old owner with the minimum rendezvous score\n let mut min_score = u64::MAX;\n let mut min_node = old_assignment.first().cloned()\n .unwrap_or_else(|| existing_nodes.first().unwrap().clone());\n\n for old_node in &old_assignment {\n let s = score(shard_id, old_node.as_str());\n if s < min_score {\n min_score = s;\n min_node = old_node.clone();\n }\n }\n min_node\n };\n\n affected_shards.push((ShardId(shard_id), source_node));\n }\n\n Ok(affected_shards)\n }\n\n /// Compute where each shard should go when draining a node.\n /// Returns shard -> destination_node mapping.\n async fn compute_shard_destinations_for_drain(\n &self,\n drain_node_id: &str,\n replica_group: u32,\n ) -> Result, RebalancerError> {\n let topo = self.topology.read().await;\n\n let drain_node_id = TopologyNodeId::new(drain_node_id.to_string());\n let rf = topo.rf();\n\n // Find the target group\n let group = topo\n .groups()\n .find(|g| g.id == replica_group)\n .ok_or_else(|| RebalancerError::GroupNotFound(replica_group))?;\n\n let other_nodes: Vec<_> = group\n .nodes()\n .iter()\n .filter(|n| **n != drain_node_id)\n .cloned()\n .collect();\n\n if other_nodes.is_empty() {\n return Err(RebalancerError::CannotRemoveLastNode);\n }\n\n let mut destinations = Vec::new();\n\n // For each shard, find a new owner among the remaining nodes\n for shard_id in 0..topo.shards {\n // Check if the draining node is in the assignment for this shard\n let assignment: Vec<_> = assign_shard_in_group(shard_id, group.nodes(), rf);\n\n if assignment.contains(&drain_node_id) {\n // This shard needs a new home\n // Use rendezvous hash to pick the best remaining node\n let mut best_node = None;\n let mut best_score = 0u64;\n\n for node in &other_nodes {\n let s = score(shard_id, node.as_str());\n if s > best_score {\n best_score = s;\n best_node = Some(node.clone());\n }\n }\n\n if let Some(dest) = best_node {\n destinations.push((ShardId(shard_id), dest));\n }\n }\n }\n\n Ok(destinations)\n }\n}\n\n/// Background task to run migrations for a topology operation.\nasync fn run_migration_task(\n topology: Arc>,\n coordinator: Arc>,\n operations: Arc>>,\n active_migrations: Arc>>,\n op_id: u64,\n migrations: Vec,\n config: RebalancerConfig,\n executor: Option>,\n metrics: Arc>,\n) -> Result<(), RebalancerError> {\n let Some(exec) = executor else {\n // No executor - simulate completion for testing\n for mid in migrations {\n tokio::time::sleep(tokio::time::Duration::from_millis(\n config.migration_batch_delay_ms,\n ))\n .await;\n\n let shards_to_complete = {\n let coord = coordinator.read().await;\n if let Some(state) = coord.get_state(mid) {\n state.old_owners.keys().copied().collect::>()\n } else {\n continue;\n }\n };\n\n let docs_per_shard = 1000u64;\n {\n let mut coord = coordinator.write().await;\n for shard in &shards_to_complete {\n coord.shard_migration_complete(mid, *shard, docs_per_shard)?;\n }\n }\n\n // Record metrics for simulated migration\n {\n let mut metrics_guard = metrics.write().await;\n metrics_guard.record_documents_migrated(docs_per_shard * shards_to_complete.len() as u64);\n }\n\n {\n let mut coord = coordinator.write().await;\n coord.begin_cutover(mid)?;\n coord.complete_drain(mid)?;\n coord.complete_cleanup(mid)?;\n }\n\n {\n let mut active = active_migrations.write().await;\n active.remove(&mid);\n }\n }\n\n // Mark operation as complete\n {\n let mut ops = operations.write().await;\n if let Some(op) = ops.get_mut(&op_id) {\n op.status = TopologyOperationStatus::Complete;\n op.completed_at = Some(now_ms());\n }\n }\n\n // Mark new node as active\n {\n let mut topo = topology.write().await;\n let ops = operations.read().await;\n if let Some(op) = ops.get(&op_id) {\n if let Some(ref node_id) = op.target_node {\n let node_id = TopologyNodeId::new(node_id.clone());\n if let Some(node) = topo.node_mut(&node_id) {\n node.status = NodeStatus::Active;\n }\n }\n }\n }\n\n return Ok(());\n };\n\n // With executor - perform actual migration\n // For each migration (each shard that moves to the new node)\n for mid in migrations {\n // Get migration state to find source/target info\n let (new_node, _replica_group, old_owners, index_uid) = {\n let coord = coordinator.read().await;\n let state = coord.get_state(mid).ok_or_else(|| {\n RebalancerError::InvalidState(\"migration state not found\".into())\n })?;\n\n // Use a default index for now - in production, this would come from config\n let index_uid = \"default\".to_string();\n\n (\n state.new_node.to_string(),\n state.replica_group,\n state.old_owners.clone(),\n index_uid,\n )\n };\n\n // Get node addresses\n let (new_node_address, old_owner_addresses) = {\n let topo = topology.read().await;\n let new_addr = topo.node(&TopologyNodeId::new(new_node.to_string()))\n .ok_or_else(|| RebalancerError::NodeNotFound(new_node.to_string()))?\n .address.clone();\n\n let mut old_addrs = HashMap::new();\n for (shard, old_node) in &old_owners {\n if let Some(node) = topo.node(&migration_to_topo_node_id(old_node)) {\n old_addrs.insert(*shard, node.address.clone());\n }\n }\n\n (new_addr, old_addrs)\n };\n\n let mut migration_total_docs = 0u64;\n\n // For each shard in the migration\n for (shard_id, old_node_id) in &old_owners {\n let old_address = old_owner_addresses.get(shard_id)\n .ok_or_else(|| RebalancerError::InvalidState(\"old node address not found\".into()))?;\n\n info!(\n migration_id = %mid,\n shard_id = shard_id.0,\n from = %old_node_id.0,\n to = %new_node,\n \"starting shard migration\"\n );\n\n // Paginate through all documents for this shard\n let mut offset = 0u32;\n let limit = config.migration_batch_size;\n let mut total_docs_copied = 0u64;\n\n loop {\n // Fetch documents from source\n let (docs, _total) = exec.fetch_documents(\n &old_node_id.0,\n old_address,\n &index_uid,\n shard_id.0,\n limit,\n offset,\n ).await.map_err(|e| {\n RebalancerError::InvalidState(format!(\"fetch failed: {}\", e))\n })?;\n\n if docs.is_empty() {\n break; // No more documents\n }\n\n // Write documents to target\n exec.write_documents(\n &new_node,\n &new_node_address,\n &index_uid,\n docs.clone(),\n ).await.map_err(|e| {\n RebalancerError::InvalidState(format!(\"write failed: {}\", e))\n })?;\n\n total_docs_copied += docs.len() as u64;\n offset += limit;\n\n // Throttle if configured\n if config.migration_batch_delay_ms > 0 {\n tokio::time::sleep(tokio::time::Duration::from_millis(\n config.migration_batch_delay_ms,\n ))\n .await;\n }\n }\n\n // Mark shard migration complete\n {\n let mut coord = coordinator.write().await;\n coord.shard_migration_complete(mid, *shard_id, total_docs_copied)?;\n }\n\n migration_total_docs += total_docs_copied;\n\n info!(\n migration_id = %mid,\n shard_id = shard_id.0,\n docs_copied = total_docs_copied,\n \"shard migration complete\"\n );\n }\n\n // Record metrics for this migration\n {\n let mut metrics_guard = metrics.write().await;\n metrics_guard.record_documents_migrated(migration_total_docs);\n }\n\n // All shards for this migration complete - begin cutover\n {\n let mut coord = coordinator.write().await;\n coord.begin_cutover(mid)?;\n }\n\n // Delta pass: re-read from source to catch stragglers\n for (shard_id, old_node_id) in &old_owners {\n let old_address = old_owner_addresses.get(shard_id).unwrap();\n\n let (docs, _) = exec.fetch_documents(\n &old_node_id.0,\n old_address,\n &index_uid,\n shard_id.0,\n config.migration_batch_size,\n 0,\n ).await.map_err(|e| {\n RebalancerError::InvalidState(format!(\"delta fetch failed: {}\", e))\n })?;\n\n if !docs.is_empty() {\n // Write any stragglers to target\n exec.write_documents(\n &new_node,\n &new_node_address,\n &index_uid,\n docs,\n ).await.map_err(|e| {\n RebalancerError::InvalidState(format!(\"delta write failed: {}\", e))\n })?;\n }\n\n // Mark delta complete\n {\n let mut coord = coordinator.write().await;\n // Complete drain after delta pass\n coord.complete_drain(mid)?;\n }\n }\n\n // Activate shards\n {\n let mut coord = coordinator.write().await;\n coord.complete_cleanup(mid)?;\n }\n\n // Delete migrated shards from old nodes\n for (shard_id, old_node_id) in &old_owners {\n let old_address = old_owner_addresses.get(shard_id).unwrap();\n\n if let Err(e) = exec.delete_shard(\n &old_node_id.0,\n old_address,\n &index_uid,\n shard_id.0,\n ).await {\n warn!(\n shard_id = shard_id.0,\n node = %old_node_id.0,\n error = %e,\n \"failed to delete migrated shard from old node (may need manual cleanup)\"\n );\n }\n }\n\n // Remove from active migrations\n {\n let mut active = active_migrations.write().await;\n active.remove(&mid);\n }\n }\n\n // Mark operation as complete\n {\n let mut ops = operations.write().await;\n if let Some(op) = ops.get_mut(&op_id) {\n op.status = TopologyOperationStatus::Complete;\n op.completed_at = Some(now_ms());\n }\n }\n\n // Mark new node as active\n {\n let mut topo = topology.write().await;\n let ops = operations.read().await;\n if let Some(op) = ops.get(&op_id) {\n if let Some(ref node_id) = op.target_node {\n let node_id = TopologyNodeId::new(node_id.clone());\n if let Some(node) = topo.node_mut(&node_id) {\n node.status = NodeStatus::Active;\n }\n }\n }\n }\n\n Ok(())\n}\n\n/// Background task to run drain migrations for a node.\nasync fn run_drain_task(\n topology: Arc>,\n coordinator: Arc>,\n operations: Arc>>,\n active_migrations: Arc>>,\n op_id: u64,\n migrations: Vec,\n config: RebalancerConfig,\n drain_node_id: String,\n executor: Option>,\n metrics: Arc>,\n) -> Result<(), RebalancerError> {\n let Some(exec) = executor else {\n // No executor - simulate completion for testing\n for mid in migrations {\n tokio::time::sleep(tokio::time::Duration::from_millis(\n config.migration_batch_delay_ms,\n ))\n .await;\n\n let shards_to_complete = {\n let coord = coordinator.read().await;\n if let Some(state) = coord.get_state(mid) {\n state.old_owners.keys().copied().collect::>()\n } else {\n continue;\n }\n };\n\n let docs_per_shard = 1000u64;\n {\n let mut coord = coordinator.write().await;\n for shard in &shards_to_complete {\n coord.shard_migration_complete(mid, *shard, docs_per_shard)?;\n }\n }\n\n // Record metrics for simulated migration\n {\n let mut metrics_guard = metrics.write().await;\n metrics_guard.record_documents_migrated(docs_per_shard * shards_to_complete.len() as u64);\n }\n\n {\n let mut coord = coordinator.write().await;\n coord.begin_cutover(mid)?;\n coord.complete_drain(mid)?;\n coord.complete_cleanup(mid)?;\n }\n\n {\n let mut active = active_migrations.write().await;\n active.remove(&mid);\n }\n }\n\n // Mark operation as complete\n {\n let mut ops = operations.write().await;\n if let Some(op) = ops.get_mut(&op_id) {\n op.status = TopologyOperationStatus::Complete;\n op.completed_at = Some(now_ms());\n }\n }\n\n // Mark drained node as removed (operator can delete PVC)\n {\n let mut topo = topology.write().await;\n let node_id = TopologyNodeId::new(drain_node_id);\n if let Some(node) = topo.node_mut(&node_id) {\n node.status = NodeStatus::Removed;\n }\n }\n\n return Ok(());\n };\n\n // With executor - perform actual drain migration\n // For each migration (each shard being drained from the node)\n for mid in migrations {\n // Get migration state\n let (new_node, _replica_group, old_owners, index_uid) = {\n let coord = coordinator.read().await;\n let state = coord.get_state(mid).ok_or_else(|| {\n RebalancerError::InvalidState(\"migration state not found\".into())\n })?;\n\n // Use a default index for now\n let index_uid = \"default\".to_string();\n\n (\n state.new_node.to_string(),\n state.replica_group,\n state.old_owners.clone(),\n index_uid,\n )\n };\n\n // Get node addresses\n let (_drain_node_id_obj, drain_node_address, new_node_address) = {\n let topo = topology.read().await;\n let drain_id = TopologyNodeId::new(drain_node_id.clone());\n let drain_addr = topo.node(&drain_id)\n .ok_or_else(|| RebalancerError::NodeNotFound(drain_node_id.clone()))?\n .address.clone();\n\n let new_addr = topo.node(&TopologyNodeId::new(new_node.to_string()))\n .ok_or_else(|| RebalancerError::NodeNotFound(new_node.to_string()))?\n .address.clone();\n\n (drain_id, drain_addr, new_addr)\n };\n\n // For each shard being drained\n for (shard_id, _old_node) in &old_owners {\n info!(\n migration_id = %mid,\n shard_id = shard_id.0,\n from = %drain_node_id,\n to = %new_node,\n \"starting shard drain\"\n );\n\n // Paginate through all documents for this shard on the draining node\n let mut offset = 0u32;\n let limit = config.migration_batch_size;\n let mut total_docs_copied = 0u64;\n\n loop {\n // Fetch documents from draining node\n let (docs, _total) = exec.fetch_documents(\n &drain_node_id,\n &drain_node_address,\n &index_uid,\n shard_id.0,\n limit,\n offset,\n ).await.map_err(|e| {\n RebalancerError::InvalidState(format!(\"fetch failed: {}\", e))\n })?;\n\n if docs.is_empty() {\n break; // No more documents\n }\n\n // Write documents to new node\n exec.write_documents(\n &new_node,\n &new_node_address,\n &index_uid,\n docs.clone(),\n ).await.map_err(|e| {\n RebalancerError::InvalidState(format!(\"write failed: {}\", e))\n })?;\n\n total_docs_copied += docs.len() as u64;\n offset += limit;\n\n if config.migration_batch_delay_ms > 0 {\n tokio::time::sleep(tokio::time::Duration::from_millis(\n config.migration_batch_delay_ms,\n ))\n .await;\n }\n }\n\n // Mark shard migration complete\n {\n let mut coord = coordinator.write().await;\n coord.shard_migration_complete(mid, *shard_id, total_docs_copied)?;\n }\n\n info!(\n migration_id = %mid,\n shard_id = shard_id.0,\n docs_copied = total_docs_copied,\n \"shard drain complete\"\n );\n }\n\n // All shards for this migration complete - begin cutover\n {\n let mut coord = coordinator.write().await;\n coord.begin_cutover(mid)?;\n }\n\n // Delta pass: re-read from draining node to catch stragglers\n for (shard_id, _old_node) in &old_owners {\n let (docs, _) = exec.fetch_documents(\n &drain_node_id,\n &drain_node_address,\n &index_uid,\n shard_id.0,\n config.migration_batch_size,\n 0,\n ).await.map_err(|e| {\n RebalancerError::InvalidState(format!(\"delta fetch failed: {}\", e))\n })?;\n\n if !docs.is_empty() {\n // Write any stragglers to new node\n exec.write_documents(\n &new_node,\n &new_node_address,\n &index_uid,\n docs,\n ).await.map_err(|e| {\n RebalancerError::InvalidState(format!(\"delta write failed: {}\", e))\n })?;\n }\n\n {\n let mut coord = coordinator.write().await;\n coord.complete_drain(mid)?;\n }\n }\n\n // Activate shards and complete cleanup\n {\n let mut coord = coordinator.write().await;\n coord.complete_cleanup(mid)?;\n }\n\n // Delete drained shards from the draining node\n for (shard_id, _old_node) in &old_owners {\n if let Err(e) = exec.delete_shard(\n &drain_node_id,\n &drain_node_address,\n &index_uid,\n shard_id.0,\n ).await {\n warn!(\n shard_id = shard_id.0,\n node = %drain_node_id,\n error = %e,\n \"failed to delete drained shard (may need manual cleanup)\"\n );\n }\n }\n\n {\n let mut active = active_migrations.write().await;\n active.remove(&mid);\n }\n }\n\n // Mark operation as complete\n {\n let mut ops = operations.write().await;\n if let Some(op) = ops.get_mut(&op_id) {\n op.status = TopologyOperationStatus::Complete;\n op.completed_at = Some(now_ms());\n }\n }\n\n // Mark drained node as removed (operator can delete PVC)\n {\n let mut topo = topology.write().await;\n let node_id = TopologyNodeId::new(drain_node_id);\n if let Some(node) = topo.node_mut(&node_id) {\n node.status = NodeStatus::Removed;\n }\n }\n\n Ok(())\n}\n\n/// Get current time in milliseconds since Unix epoch.\nfn now_ms() -> u64 {\n std::time::SystemTime::now()\n .duration_since(std::time::UNIX_EPOCH)\n .unwrap_or_default()\n .as_millis() as u64\n}\n\n// ---------------------------------------------------------------------------\n// HttpMigrationExecutor - Actual HTTP-based document migration\n// ---------------------------------------------------------------------------\n\n/// HTTP-based migration executor for moving documents between Meilisearch nodes.\n///\n/// This implements the `MigrationExecutor` trait by making actual HTTP requests\n/// to Meilisearch nodes' APIs. It uses the `_miroir_shard` filterable attribute\n/// to fetch only the documents belonging to a specific shard.\npub struct HttpMigrationExecutor {\n /// Master key for authenticating with Meilisearch nodes.\n node_master_key: String,\n /// HTTP client for making requests to nodes.\n client: reqwest::Client,\n}\n\nimpl HttpMigrationExecutor {\n /// Create a new HTTP migration executor.\n ///\n /// # Arguments\n /// * `node_master_key` - Master key for authenticating with Meilisearch nodes\n /// * `node_timeout_ms` - Timeout for HTTP requests to nodes (milliseconds)\n pub fn new(node_master_key: String, node_timeout_ms: u64) -> Self {\n let timeout = std::time::Duration::from_millis(node_timeout_ms);\n\n let client = reqwest::Client::builder()\n .timeout(timeout)\n .build()\n .expect(\"Failed to create HTTP client for migration executor\");\n\n Self {\n node_master_key,\n client,\n }\n }\n\n /// Build the filter string for fetching documents by shard.\n fn shard_filter(&self, shard_id: u32) -> String {\n format!(\"_miroir_shard = {}\", shard_id)\n }\n\n /// Make an authenticated GET request to a node.\n async fn get_node(\n &self,\n node_address: &str,\n path: &str,\n ) -> std::result::Result {\n let url = if node_address.ends_with('/') {\n format!(\"{}{}\", node_address, path.trim_start_matches('/'))\n } else {\n format!(\"{}/{}\", node_address.trim_end_matches('/'), path.trim_start_matches('/'))\n };\n\n self.client\n .get(&url)\n .header(\"Authorization\", format!(\"Bearer {}\", self.node_master_key))\n .send()\n .await\n .map_err(|e| format!(\"GET {} failed: {}\", url, e))\n }\n\n /// Make an authenticated POST request to a node.\n async fn post_node(\n &self,\n node_address: &str,\n path: &str,\n body: serde_json::Value,\n ) -> std::result::Result {\n let url = if node_address.ends_with('/') {\n format!(\"{}{}\", node_address, path.trim_start_matches('/'))\n } else {\n format!(\"{}/{}\", node_address.trim_end_matches('/'), path.trim_start_matches('/'))\n };\n\n self.client\n .post(&url)\n .header(\"Authorization\", format!(\"Bearer {}\", self.node_master_key))\n .json(&body)\n .send()\n .await\n .map_err(|e| format!(\"POST {} failed: {}\", url, e))\n }\n}\n\n#[async_trait::async_trait]\nimpl MigrationExecutor for HttpMigrationExecutor {\n /// Fetch documents from a source node for a specific shard.\n ///\n /// Uses the `_miroir_shard` filterable attribute to retrieve only documents\n /// belonging to the specified shard, avoiding full index scans.\n async fn fetch_documents(\n &self,\n _source_node: &str,\n source_address: &str,\n index_uid: &str,\n shard_id: u32,\n limit: u32,\n offset: u32,\n ) -> std::result::Result<(Vec, u64), String> {\n let filter = self.shard_filter(shard_id);\n let path = format!(\n \"indexes/{}/documents?filter={}&limit={}&offset={}\",\n index_uid,\n urlencoding::encode(&filter),\n limit,\n offset\n );\n\n let response = self.get_node(source_address, &path).await?;\n\n if !response.status().is_success() {\n let status = response.status();\n let error_text = response.text().await.unwrap_or_else(|_| \"unable to read error\".to_string());\n return Err(format!(\n \"Failed to fetch documents from {}: HTTP {} - {}\",\n source_address, status, error_text\n ));\n }\n\n let json_body: serde_json::Value = response\n .json()\n .await\n .map_err(|e| format!(\"Failed to parse response from {}: {}\", source_address, e))?;\n\n // Meilisearch returns { results: [...], total: 123, limit: 20, offset: 0 }\n let results = json_body\n .get(\"results\")\n .and_then(|v| v.as_array())\n .ok_or_else(|| format!(\"Invalid response from {}: missing 'results' field\", source_address))?;\n\n let total = json_body\n .get(\"total\")\n .and_then(|v| v.as_u64())\n .unwrap_or(0);\n\n Ok((results.clone(), total))\n }\n\n /// Write documents to a target node.\n ///\n /// Documents already contain the `_miroir_shard` field from the source,\n /// so they can be written directly without modification.\n async fn write_documents(\n &self,\n _target_node: &str,\n target_address: &str,\n index_uid: &str,\n documents: Vec,\n ) -> std::result::Result<(), String> {\n if documents.is_empty() {\n return Ok(());\n }\n\n let path = format!(\"indexes/{}/documents\", index_uid);\n\n let response = self.post_node(target_address, &path, serde_json::json!(documents)).await?;\n\n if !response.status().is_success() {\n let status = response.status();\n let error_text = response.text().await.unwrap_or_else(|_| \"unable to read error\".to_string());\n return Err(format!(\n \"Failed to write {} documents to {}: HTTP {} - {}\",\n documents.len(),\n target_address,\n status,\n error_text\n ));\n }\n\n // The response contains the task UID, but we don't need to wait for it\n // since migrations are eventually consistent via anti-entropy\n Ok(())\n }\n\n /// Delete documents from a node by shard filter.\n ///\n /// This is called after a shard migration is complete to remove the\n /// migrated documents from the source node.\n async fn delete_shard(\n &self,\n _node: &str,\n node_address: &str,\n index_uid: &str,\n shard_id: u32,\n ) -> std::result::Result<(), String> {\n let filter = self.shard_filter(shard_id);\n let path = format!(\"indexes/{}/documents/delete\", index_uid);\n\n let body = serde_json::json!({\n \"filter\": filter\n });\n\n let response = self.post_node(node_address, &path, body).await?;\n\n if !response.status().is_success() {\n let status = response.status();\n let error_text = response.text().await.unwrap_or_else(|_| \"unable to read error\".to_string());\n return Err(format!(\n \"Failed to delete shard {} from {}: HTTP {} - {}\",\n shard_id, node_address, status, error_text\n ));\n }\n\n Ok(())\n }\n}\n\n#[cfg(test)]\nmod tests {\n use super::*;\n use crate::migration::MigrationConfig;\n use crate::topology::Node;\n use std::sync::Arc;\n\n fn test_topology() -> Topology {\n let mut topo = Topology::new(64, 2, 2);\n topo.add_node(Node::new(TopologyNodeId::new(\"node-0\".into()), \"http://node-0:7700\".into(), 0));\n topo.add_node(Node::new(TopologyNodeId::new(\"node-1\".into()), \"http://node-1:7700\".into(), 0));\n topo.add_node(Node::new(TopologyNodeId::new(\"node-2\".into()), \"http://node-2:7700\".into(), 1));\n topo.add_node(Node::new(TopologyNodeId::new(\"node-3\".into()), \"http://node-3:7700\".into(), 1));\n topo\n }\n\n #[test]\n fn test_rebalancer_config_default() {\n let config = RebalancerConfig::default();\n assert_eq!(config.max_concurrent_migrations, 4);\n assert_eq!(config.migration_timeout_s, 3600);\n assert!(config.auto_rebalance_on_recovery);\n }\n\n #[test]\n fn test_topology_operation_serialization() {\n let op = TopologyOperation {\n id: 1,\n op_type: TopologyOperationType::AddNode,\n status: TopologyOperationStatus::InProgress,\n target_node: Some(\"node-4\".into()),\n target_group: Some(0),\n migrations: vec![MigrationId(1), MigrationId(2)],\n started_at: Some(1700000000000),\n completed_at: None,\n error: None,\n };\n\n let json = serde_json::to_string(&op).unwrap();\n assert!(json.contains(\"\\\"op_type\\\":\\\"add_node\\\"\"));\n assert!(json.contains(\"\\\"status\\\":\\\"in_progress\\\"\"));\n assert!(json.contains(\"\\\"target_node\\\":\\\"node-4\\\"\"));\n }\n\n #[test]\n fn test_rebalance_status_serialization() {\n let status = RebalanceStatus {\n in_progress: true,\n operations: vec![],\n migrations: HashMap::new(),\n };\n\n let json = serde_json::to_string(&status).unwrap();\n assert!(json.contains(\"\\\"in_progress\\\":true\"));\n }\n\n #[tokio::test]\n async fn test_rebalancer_status() {\n let topo = Arc::new(RwLock::new(test_topology()));\n let config = RebalancerConfig::default();\n let migration_config = MigrationConfig::default();\n\n let rebalancer = Rebalancer::new(config, topo, migration_config);\n\n let status = rebalancer.status().await;\n assert!(!status.in_progress);\n assert!(status.operations.is_empty());\n }\n\n #[tokio::test]\n async fn test_add_node_creates_operation() {\n let topo = Arc::new(RwLock::new(test_topology()));\n let config = RebalancerConfig::default();\n let migration_config = MigrationConfig::default();\n\n let rebalancer = Rebalancer::new(config, topo.clone(), migration_config);\n\n let request = AddNodeRequest {\n id: \"node-4\".into(),\n address: \"http://node-4:7700\".into(),\n replica_group: 0,\n };\n\n let result = rebalancer.add_node(request).await.unwrap();\n assert!(result.id > 0);\n assert!(result.migrations_count > 0);\n\n // Check node was added\n let topo_read = topo.read().await;\n assert!(topo_read.node(&TopologyNodeId::new(\"node-4\".into())).is_some());\n }\n\n #[tokio::test]\n async fn test_add_duplicate_node_fails() {\n let topo = Arc::new(RwLock::new(test_topology()));\n let config = RebalancerConfig::default();\n let migration_config = MigrationConfig::default();\n\n let rebalancer = Rebalancer::new(config, topo, migration_config);\n\n let request = AddNodeRequest {\n id: \"node-0\".into(), // Already exists\n address: \"http://node-0:7700\".into(),\n replica_group: 0,\n };\n\n let result = rebalancer.add_node(request).await;\n assert!(result.is_err());\n }\n\n #[tokio::test]\n async fn test_remove_last_node_fails() {\n let mut topo = Topology::new(64, 1, 1);\n topo.add_node(Node::new(\n TopologyNodeId::new(\"solo\".into()),\n \"http://solo:7700\".into(),\n 0,\n ));\n let topo = Arc::new(RwLock::new(topo));\n\n let config = RebalancerConfig::default();\n let migration_config = MigrationConfig::default();\n\n let rebalancer = Rebalancer::new(config, topo, migration_config);\n\n let request = RemoveNodeRequest {\n node_id: \"solo\".into(),\n force: false,\n };\n\n let result = rebalancer.remove_node(request).await;\n assert!(matches!(result, Err(RebalancerError::CannotRemoveLastNode)));\n }\n\n #[tokio::test]\n async fn test_handle_node_failure() {\n let topo = Arc::new(RwLock::new(test_topology()));\n let config = RebalancerConfig::default();\n let migration_config = MigrationConfig::default();\n\n let rebalancer = Rebalancer::new(config, topo.clone(), migration_config);\n\n let result = rebalancer.handle_node_failure(\"node-0\").await.unwrap();\n assert!(matches!(\n result.message.as_str(),\n \"Node node-0 marked as failed\"\n ));\n\n // Check node was marked failed\n let topo_read = topo.read().await;\n let node = topo_read.node(&TopologyNodeId::new(\"node-0\".into())).unwrap();\n assert_eq!(node.status, NodeStatus::Failed);\n }\n\n #[test]\n fn test_shard_filter() {\n let executor = HttpMigrationExecutor::new(\"test-key\".to_string(), 5000);\n assert_eq!(executor.shard_filter(42), \"_miroir_shard = 42\");\n assert_eq!(executor.shard_filter(0), \"_miroir_shard = 0\");\n }\n\n #[test]\n fn test_http_migration_executor_new() {\n let executor = HttpMigrationExecutor::new(\"master-key\".to_string(), 10000);\n assert_eq!(executor.node_master_key, \"master-key\");\n }\n}\n","numLines":2215,"startLine":1,"totalLines":2215}}} 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Looking at the existing code and tests, I can see that:\n\n1. The `RebalancerWorker` is already quite well implemented with:\n - Leader lease acquisition and renewal\n - Event handling for topology changes\n - Migration state machine driving\n - Metrics updates\n - Progress persistence\n - Pause/resume functionality\n\n2. 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|\n10 | use crate::topology::{Group, NodeId, Topology};\n | ^^^^^\n\nwarning: unused import: `std::collections::HashMap`\n --> crates/miroir-core/src/anti_entropy.rs:12:5\n |\n12 | use std::collections::HashMap;\n | ^^^^^^^^^^^^^^^^^^^^^^^^^\n\nwarning: unused import: `crate::router::shard_for_key`\n --> crates/miroir-core/src/explainer.rs:7:5\n |\n7 | use crate::router::shard_for_key;\n | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n\nwarning: unused imports: `MiroirError` and `Result`\n --> crates/miroir-core/src/hedging.rs:6:20\n |\n6 | use crate::error::{MiroirError, Result};\n | ^^^^^^^^^^^ ^^^^^^\n\nwarning: unused imports: `Instant` and `sleep`\n --> crates/miroir-core/src/hedging.rs:14:19\n |\n14 | use tokio::time::{sleep, Instant};\n | ^^^^^ ^^^^^^^\n\nwarning: unused import: `std::future::Future`\n --> crates/miroir-core/src/multi_search.rs:10:5\n |\n10 | use std::future::Future;\n | ^^^^^^^^^^^^^^^^^^^\n\nwarning: unused import: `Instant`\n --> crates/miroir-core/src/rebalancer_worker/drift_reconciler.rs:16:27\n |\n16 | use std::time::{Duration, Instant};\n | ^^^^^^^\n\nwarning: unused import: `tokio::sync::RwLock`\n --> crates/miroir-core/src/rebalancer_worker/drift_reconciler.rs:17:5\n |\n17 | use tokio::sync::RwLock;\n | ^^^^^^^^^^^^^^^^^^^\n\nwarning: unused imports: `MiroirError` and `Result`\n --> crates/miroir-core/src/replica_selection.rs:6:20\n |\n6 | use crate::error::{MiroirError, Result};\n | ^^^^^^^^^^^ ^^^^^^\n\nwarning: unused import: `Group`\n --> crates/miroir-core/src/replica_selection.rs:7:23\n |\n7 | use crate::topology::{Group, NodeId};\n | ^^^^^\n\nwarning: unused import: `Duration`\n --> crates/miroir-core/src/replica_selection.rs:12:17\n |\n12 | use std::time::{Duration, Instant};\n | ^^^^^^^^\n\nwarning: unused import: `MiroirError`\n --> crates/miroir-core/src/ttl.rs:6:20\n |\n6 | use crate::error::{MiroirError, Result};\n | ^^^^^^^^^^^\n\nwarning: unused variable: `replica_groups`\n --> crates/miroir-core/src/anti_entropy.rs:160:13\n |\n160 | let replica_groups = topology.groups().count() as u32;\n | ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_replica_groups`\n |\n = note: `#[warn(unused_variables)]` on by default\n\nwarning: unused variable: `reference`\n --> crates/miroir-core/src/anti_entropy.rs:288:9\n |\n288 | reference: &ShardFingerprint,\n | ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_reference`\n\nwarning: unused variable: `job`\n --> crates/miroir-core/src/rebalancer_worker/mod.rs:882:22\n |\n882 | for (job_id, job) in active_jobs\n | ^^^ help: if this is intentional, prefix it with an underscore: `_job`","is_error":false}]},"parent_tool_use_id":null,"session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","uuid":"00b320a4-fe9c-4138-b6b6-4d705f4e9bfa","timestamp":"2026-05-23T05:59:02.067Z","tool_use_result":{"stdout":"warning: unused import: `MiroirError`\n --> crates/miroir-core/src/anti_entropy.rs:7:20\n |\n7 | use crate::error::{MiroirError, Result};\n | ^^^^^^^^^^^\n |\n = note: `#[warn(unused_imports)]` on by default\n\nwarning: unused import: `Group`\n --> crates/miroir-core/src/anti_entropy.rs:10:23\n |\n10 | use crate::topology::{Group, NodeId, Topology};\n | ^^^^^\n\nwarning: unused import: `std::collections::HashMap`\n --> crates/miroir-core/src/anti_entropy.rs:12:5\n |\n12 | use std::collections::HashMap;\n | ^^^^^^^^^^^^^^^^^^^^^^^^^\n\nwarning: unused import: `crate::router::shard_for_key`\n --> crates/miroir-core/src/explainer.rs:7:5\n |\n7 | use crate::router::shard_for_key;\n | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n\nwarning: unused imports: `MiroirError` and `Result`\n --> crates/miroir-core/src/hedging.rs:6:20\n |\n6 | use crate::error::{MiroirError, Result};\n | ^^^^^^^^^^^ ^^^^^^\n\nwarning: unused imports: `Instant` and `sleep`\n --> crates/miroir-core/src/hedging.rs:14:19\n |\n14 | use tokio::time::{sleep, Instant};\n | ^^^^^ ^^^^^^^\n\nwarning: unused import: `std::future::Future`\n --> crates/miroir-core/src/multi_search.rs:10:5\n |\n10 | use std::future::Future;\n | ^^^^^^^^^^^^^^^^^^^\n\nwarning: unused import: `Instant`\n --> crates/miroir-core/src/rebalancer_worker/drift_reconciler.rs:16:27\n |\n16 | use std::time::{Duration, Instant};\n | ^^^^^^^\n\nwarning: unused import: `tokio::sync::RwLock`\n --> crates/miroir-core/src/rebalancer_worker/drift_reconciler.rs:17:5\n |\n17 | use tokio::sync::RwLock;\n | ^^^^^^^^^^^^^^^^^^^\n\nwarning: unused imports: `MiroirError` and `Result`\n --> crates/miroir-core/src/replica_selection.rs:6:20\n |\n6 | use crate::error::{MiroirError, Result};\n | ^^^^^^^^^^^ ^^^^^^\n\nwarning: unused import: `Group`\n --> crates/miroir-core/src/replica_selection.rs:7:23\n |\n7 | use crate::topology::{Group, NodeId};\n | ^^^^^\n\nwarning: unused import: `Duration`\n --> crates/miroir-core/src/replica_selection.rs:12:17\n |\n12 | use std::time::{Duration, Instant};\n | 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it with an underscore: `_reconciler`\n\nwarning: unused variable: `topo`\n --> crates/miroir-core/src/rebalancer_worker/mod.rs:1631:13\n |\n1631 | let topo = Arc::new(RwLock::new(test_topology()));\n | ^^^^ help: if this is intentional, prefix it with an underscore: `_topo`\n\nwarning: unused variable: `config`\n --> crates/miroir-core/src/rebalancer_worker/mod.rs:1632:13\n |\n1632 | let config = RebalancerWorkerConfig::default();\n | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_config`\n\nwarning: unused variable: `new_node_id`\n --> crates/miroir-core/src/rebalancer_worker/mod.rs:1639:13\n |\n1639 | let new_node_id = \"node-new\";\n | ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_new_node_id`\n\nwarning: unused variable: `replica_group`\n --> crates/miroir-core/src/rebalancer_worker/mod.rs:1640:13\n |\n1640 | let replica_group = 0;\n | ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_replica_group`\n\nwarning: `miroir-proxy` (lib test) generated 39 warnings (run `cargo fix --lib -p miroir-proxy --tests` to apply 20 suggestions)\nwarning: `miroir-core` (lib test) generated 61 warnings (41 duplicates) (run `cargo fix --lib -p miroir-core --tests` to apply 11 suggestions)\n Finished `test` profile [unoptimized + debuginfo] target(s) in 0.17s\n Running unittests src/lib.rs (target/debug/deps/miroir_core-84d41a45c478424c)\n\nrunning 1 test\ntest rebalancer_worker::acceptance_tests::p4_1_a1_advisory_lock_prevents_duplicate_migrations ... ok\n\ntest result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 425 filtered out; finished in 0.00s\n\n Running unittests src/lib.rs (target/debug/deps/miroir_ctl-fce7aac87cfa7a4a)\n\nrunning 0 tests\n\ntest result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 8 filtered out; finished in 0.00s\n\n Running unittests src/lib.rs (target/debug/deps/miroir_proxy-98913b4d9e9e066c)\n\nrunning 0 tests\n\ntest result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 134 filtered out; finished in 0.00s","is_error":false}]},"parent_tool_use_id":null,"session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","uuid":"e30bfadc-c226-4456-bb9e-d8bf3f31771e","timestamp":"2026-05-23T05:59:07.255Z","tool_use_result":{"stdout":" |\n512 | let reconciler = DriftReconciler::new(\n | ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_reconciler`\n\nwarning: unused variable: `topo`\n --> crates/miroir-core/src/rebalancer_worker/mod.rs:1631:13\n |\n1631 | let topo = Arc::new(RwLock::new(test_topology()));\n | ^^^^ help: if this is intentional, prefix it with an underscore: `_topo`\n\nwarning: unused variable: `config`\n --> crates/miroir-core/src/rebalancer_worker/mod.rs:1632:13\n |\n1632 | let config = RebalancerWorkerConfig::default();\n | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_config`\n\nwarning: unused variable: `new_node_id`\n --> crates/miroir-core/src/rebalancer_worker/mod.rs:1639:13\n |\n1639 | let new_node_id = \"node-new\";\n | ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_new_node_id`\n\nwarning: unused variable: `replica_group`\n --> crates/miroir-core/src/rebalancer_worker/mod.rs:1640:13\n |\n1640 | let replica_group = 0;\n | ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_replica_group`\n\nwarning: `miroir-proxy` (lib test) generated 39 warnings (run `cargo fix --lib -p miroir-proxy --tests` to apply 20 suggestions)\nwarning: `miroir-core` (lib test) generated 61 warnings (41 duplicates) (run `cargo fix --lib -p miroir-core --tests` to apply 11 suggestions)\n Finished `test` profile [unoptimized + debuginfo] target(s) in 0.17s\n Running unittests src/lib.rs (target/debug/deps/miroir_core-84d41a45c478424c)\n\nrunning 1 test\ntest rebalancer_worker::acceptance_tests::p4_1_a1_advisory_lock_prevents_duplicate_migrations ... ok\n\ntest result: ok. 1 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unittests src/lib.rs (target/debug/deps/miroir_core-84d41a45c478424c)\n\nrunning 1 test\ntest rebalancer_worker::acceptance_tests::p4_1_a1_advisory_lock_prevents_duplicate_migrations ... ok\n\ntest result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 425 filtered out; finished in 0.00s\n\n Running unittests src/lib.rs (target/debug/deps/miroir_ctl-fce7aac87cfa7a4a)\n\nrunning 0 tests\n\ntest result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 8 filtered out; finished in 0.00s\n\n Running unittests src/lib.rs (target/debug/deps/miroir_proxy-98913b4d9e9e066c)\n\nrunning 0 tests\n\ntest result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 134 filtered out; finished in 0.00s","is_error":false}]},"parent_tool_use_id":null,"session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","uuid":"73f997ee-b1a1-48ad-a483-bfc8ef2975ea","timestamp":"2026-05-23T06:03:31.518Z","tool_use_result":{"stdout":" | ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_new_node_id`\n\nwarning: unused variable: `replica_group`\n --> crates/miroir-core/src/rebalancer_worker/mod.rs:1640:13\n |\n1640 | let replica_group = 0;\n | ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_replica_group`\n\nwarning: `miroir-proxy` (lib test) generated 39 warnings (run `cargo fix --lib -p miroir-proxy --tests` to apply 20 suggestions)\nwarning: `miroir-core` (lib test) generated 61 warnings (41 duplicates) (run `cargo fix --lib -p miroir-core --tests` to apply 11 suggestions)\n Finished `test` profile [unoptimized + debuginfo] target(s) in 0.18s\n Running unittests src/lib.rs (target/debug/deps/miroir_core-84d41a45c478424c)\n\nrunning 1 test\ntest rebalancer_worker::acceptance_tests::p4_1_a1_advisory_lock_prevents_duplicate_migrations ... ok\n\ntest result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 425 filtered out; finished in 0.00s\n\n Running unittests src/lib.rs (target/debug/deps/miroir_ctl-fce7aac87cfa7a4a)\n\nrunning 0 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Let me check the other tests.","signature":""}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":null,"session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","uuid":"c348994b-a2b4-4e34-895d-ed67b840b6dd"} -{"type":"stream_event","event":{"type":"content_block_stop","index":0},"session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","parent_tool_use_id":null,"uuid":"b1ecaf58-c4ae-47ab-87f5-8f5c1dbdd179"} -{"type":"stream_event","event":{"type":"content_block_start","index":1,"content_block":{"type":"tool_use","id":"call_057ef76875404a1daf47ba56","name":"Bash","input":{}}},"session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","parent_tool_use_id":null,"uuid":"647254c6-64f1-467a-aef0-7c9768116e62"} -{"type":"stream_event","event":{"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":"{\"command\":\"cargo test --lib 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unused variable: `replica_group`\n --> crates/miroir-core/src/rebalancer_worker/mod.rs:1640:13\n |\n1640 | let replica_group = 0;\n | ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_replica_group`\n\nwarning: `miroir-proxy` (lib test) generated 39 warnings (run `cargo fix --lib -p miroir-proxy --tests` to apply 20 suggestions)\nwarning: `miroir-core` (lib test) generated 61 warnings (41 duplicates) (run `cargo fix --lib -p miroir-core --tests` to apply 11 suggestions)\n Finished `test` profile [unoptimized + debuginfo] target(s) in 0.15s\n Running unittests src/lib.rs (target/debug/deps/miroir_core-84d41a45c478424c)\n\nrunning 1 test\ntest rebalancer_worker::acceptance_tests::p4_1_a2_progress_persistence_pods_resume_migration ... ok\n\ntest result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 425 filtered out; finished in 0.00s\n\n Running unittests src/lib.rs (target/debug/deps/miroir_ctl-fce7aac87cfa7a4a)\n\nrunning 0 tests\n\ntest result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 8 filtered out; finished in 0.00s\n\n Running unittests src/lib.rs (target/debug/deps/miroir_proxy-98913b4d9e9e066c)\n\nrunning 0 tests\n\ntest result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 134 filtered out; finished in 0.00s","is_error":false}]},"parent_tool_use_id":null,"session_id":"5d988f6a-5757-4849-a9ba-b2775a65da97","uuid":"8123aa11-c0ad-466e-ac0c-8e306eb45ca9","timestamp":"2026-05-23T06:03:36.778Z","tool_use_result":{"stdout":" | ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_new_node_id`\n\nwarning: unused variable: `replica_group`\n --> crates/miroir-core/src/rebalancer_worker/mod.rs:1640:13\n |\n1640 | let replica_group = 0;\n | ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_replica_group`\n\nwarning: `miroir-proxy` (lib test) generated 39 warnings (run `cargo fix --lib -p miroir-proxy --tests` to apply 20 suggestions)\nwarning: `miroir-core` (lib test) generated 61 warnings (41 duplicates) (run `cargo fix --lib -p miroir-core --tests` to apply 11 suggestions)\n Finished `test` profile [unoptimized + debuginfo] target(s) in 0.15s\n Running unittests src/lib.rs (target/debug/deps/miroir_core-84d41a45c478424c)\n\nrunning 1 test\ntest rebalancer_worker::acceptance_tests::p4_1_a2_progress_persistence_pods_resume_migration ... ok\n\ntest result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 425 filtered out; finished in 0.00s\n\n Running unittests src/lib.rs (target/debug/deps/miroir_ctl-fce7aac87cfa7a4a)\n\nrunning 0 tests\n\ntest result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 8 filtered out; finished in 0.00s\n\n Running unittests src/lib.rs (target/debug/deps/miroir_proxy-98913b4d9e9e066c)\n\nrunning 0 tests\n\ntest result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 134 filtered out; finished in 0.00s","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false}} 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Focus on finding:\n- Existing files and their locations\n- Database schema for leader_lease and jobs tables\n- How events are sent (admin API, health checker)\n- The router/shard computation logic\n\nBe thorough - I need to understand the architecture before implementing.","subagent_type":"Explore"}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":null,"session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"0a7edda1-8ebe-4595-a415-aecf5618a8b8"} +{"type":"stream_event","event":{"type":"content_block_stop","index":2},"session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","parent_tool_use_id":null,"uuid":"aaaf084d-7317-4f02-8e8d-7eba2aacf8f3"} +{"type":"stream_event","event":{"type":"message_delta","delta":{"stop_reason":"tool_use","stop_sequence":null},"usage":{"input_tokens":9292,"output_tokens":403,"cache_read_input_tokens":21248,"server_tool_use":{"web_search_requests":0},"service_tier":"standard"}},"session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","parent_tool_use_id":null,"uuid":"864c9fd3-69e8-42a9-bb2f-93126f930618"} +{"type":"stream_event","event":{"type":"message_stop"},"session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","parent_tool_use_id":null,"uuid":"1a79163b-f0b2-476f-8757-e931fccad757"} +{"type":"system","subtype":"task_started","task_id":"a044869e1855cdfaf","tool_use_id":"call_0f9d635724804b359279800d","description":"Explore codebase for rebalancer","task_type":"local_agent","prompt":"Explore the /home/coding/miroir codebase to find:\n1. 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Any existing rebalancer-related code (search for \"rebalance\", \"migrate\", \"migration\")\n2. Background task patterns (Tokio tasks, workers)\n3. Leader lease implementation (search for \"leader_lease\", \"advisory\", \"lock\")\n4. Phase 1 router implementation (shard computation)\n5. Jobs table structure (Phase 3) for progress persistence\n6. Metrics implementation patterns (search for \"metrics\", \"miroir_\")\n\nReport what exists and what needs to be created. Focus on finding:\n- Existing files and their locations\n- Database schema for leader_lease and jobs tables\n- How events are sent (admin API, health checker)\n- The router/shard computation logic\n\nBe thorough - I need to understand the architecture before implementing."}]},"parent_tool_use_id":"call_0f9d635724804b359279800d","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"ec91c015-a768-4f29-85d1-34aa5c0150c5","timestamp":"2026-05-23T06:36:55.207Z"} +{"type":"system","subtype":"task_progress","task_id":"a044869e1855cdfaf","tool_use_id":"call_0f9d635724804b359279800d","description":"Searching for rebalance|migrate|migration","usage":{"total_tokens":0,"tool_uses":1,"duration_ms":3472},"last_tool_name":"Grep","uuid":"aa17950f-232f-4be5-a915-4da9de35a8e0","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39"} 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fields (no-op)\n2\t-- This migration is a no-op because the node_errors field was already included\n3\t-- in the initial schema (001_initial.sql). This migration exists to maintain\n4\t-- migration version continuity for databases that may have already applied it.\n5\t--\n6\t-- All required task registry fields are already present:\n7\t-- - miroir_id, created_at, status, node_tasks, error\n8\t-- - started_at, finished_at, index_uid, task_type, node_errors\n9\t--\n10\t-- No schema changes needed.\n11\t\n12\t-- No-op: leave a marker that this migration was applied\n13\t-- (SELECT 1 is used to ensure the migration is recorded but doesn't modify schema)\n14\tSELECT 1 AS migration_003_noop;\n15\t"}]},"parent_tool_use_id":"call_0f9d635724804b359279800d","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"e6261591-cdb1-477a-81ac-0be4565a33ee","timestamp":"2026-05-23T06:37:01.797Z"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_aef9fd8fa7534402ab826068","type":"tool_result","content":"1\t-- Migration 002: Feature tables (tables 8-14 from plan §4)\n2\t-- Creates tables for canaries, CDC, tenant mapping, ILM, search UI config, and admin sessions.\n3\t\n4\t-- Table 8: canaries — canary definitions\n5\tCREATE TABLE IF NOT EXISTS canaries (\n6\t id TEXT PRIMARY KEY,\n7\t name TEXT NOT NULL,\n8\t index_uid TEXT NOT NULL,\n9\t interval_s INTEGER NOT NULL,\n10\t query_json TEXT NOT NULL, -- JSON: the canary query body\n11\t assertions_json TEXT NOT NULL, -- JSON: array of assertion specs\n12\t enabled INTEGER NOT NULL, -- 0 | 1\n13\t created_at INTEGER NOT NULL\n14\t);\n15\t\n16\t-- Table 9: canary_runs — canary run history\n17\tCREATE TABLE IF NOT EXISTS canary_runs (\n18\t canary_id TEXT NOT NULL,\n19\t ran_at INTEGER NOT NULL,\n20\t status TEXT NOT NULL, -- pass | fail | error\n21\t latency_ms INTEGER NOT NULL,\n22\t failed_assertions_json TEXT, -- JSON array or NULL when pass\n23\t PRIMARY KEY (canary_id, ran_at)\n24\t);\n25\t\n26\t-- Trigger to auto-prune canary_runs to run_history_per_canary (default 100)\n27\t-- Fires after insert to keep only the N most recent runs per canary\n28\tCREATE TRIGGER IF NOT EXISTS canary_runs_auto_prune\n29\tAFTER INSERT ON canary_runs\n30\tBEGIN\n31\t DELETE FROM canary_runs\n32\t WHERE canary_id = NEW.canary_id\n33\t AND ran_at NOT IN (\n34\t SELECT ran_at\n35\t FROM canary_runs\n36\t WHERE canary_id = NEW.canary_id\n37\t ORDER BY ran_at DESC\n38\t LIMIT 100\n39\t );\n40\tEND;\n41\t\n42\t-- Table 10: cdc_cursors — per-sink per-index CDC cursor\n43\tCREATE TABLE IF NOT EXISTS cdc_cursors (\n44\t sink_name TEXT NOT NULL,\n45\t index_uid TEXT NOT NULL,\n46\t last_event_seq INTEGER NOT NULL,\n47\t updated_at INTEGER NOT NULL,\n48\t PRIMARY KEY (sink_name, index_uid)\n49\t);\n50\t\n51\t-- Table 11: tenant_map — API-key → tenant mapping for tenant_affinity.mode: api_key\n52\tCREATE TABLE IF NOT EXISTS tenant_map (\n53\t api_key_hash BLOB PRIMARY KEY, -- sha256(api_key)\n54\t tenant_id TEXT NOT NULL,\n55\t group_id INTEGER -- nullable: NULL falls through to hash(tenant_id) % RG\n56\t);\n57\t\n58\t-- Table 12: rollover_policies — ILM rollover policies\n59\tCREATE TABLE IF NOT EXISTS rollover_policies (\n60\t name TEXT PRIMARY KEY,\n61\t write_alias TEXT NOT NULL,\n62\t read_alias TEXT NOT NULL,\n63\t pattern TEXT NOT NULL, -- e.g. \"logs-{YYYY-MM-DD}\"\n64\t triggers_json TEXT NOT NULL, -- JSON: { max_docs, max_age, max_size_gb }\n65\t retention_json TEXT NOT NULL, -- JSON: { keep_indexes }\n66\t template_json TEXT NOT NULL, -- JSON: { primary_key, settings_ref }\n67\t enabled INTEGER NOT NULL -- 0 | 1\n68\t);\n69\t\n70\t-- Table 13: search_ui_config — per-index search-UI configuration\n71\tCREATE TABLE IF NOT EXISTS search_ui_config (\n72\t index_uid TEXT PRIMARY KEY,\n73\t config_json TEXT NOT NULL, -- JSON: the search_ui config\n74\t updated_at INTEGER NOT NULL\n75\t);\n76\t\n77\t-- Table 14: admin_sessions — Admin UI session registry\n78\tCREATE TABLE IF NOT EXISTS admin_sessions (\n79\t session_id TEXT PRIMARY KEY,\n80\t csrf_token TEXT NOT NULL,\n81\t admin_key_hash TEXT NOT NULL, -- sha256 of admin key used at login\n82\t created_at INTEGER NOT NULL,\n83\t expires_at INTEGER NOT NULL,\n84\t revoked INTEGER NOT NULL DEFAULT 0,\n85\t user_agent TEXT,\n86\t source_ip TEXT\n87\t);\n88\t\n89\t-- Index for admin session expiry queries\n90\tCREATE INDEX IF NOT EXISTS admin_sessions_expires ON admin_sessions(expires_at);\n91\t"}]},"parent_tool_use_id":"call_0f9d635724804b359279800d","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"4ac79f9f-33f5-4cc3-a690-1c804133cecd","timestamp":"2026-05-23T06:37:01.798Z"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_f9005c8bc23a4554811a9f8b","type":"tool_result","content":"1\t-- Migration 001: Core task store tables (tables 1-7 from plan §4)\n2\t-- Creates the foundational tables for task registry, sessions, jobs, and leader election.\n3\t\n4\t-- Table 1: tasks — Miroir task registry\n5\tCREATE TABLE IF NOT EXISTS tasks (\n6\t miroir_id TEXT PRIMARY KEY,\n7\t created_at INTEGER NOT NULL,\n8\t status TEXT NOT NULL, -- enqueued | processing | succeeded | failed | canceled\n9\t node_tasks TEXT NOT NULL, -- JSON: {\"node-0\": 42, \"node-1\": 17}\n10\t error TEXT,\n11\t started_at INTEGER,\n12\t finished_at INTEGER,\n13\t index_uid TEXT,\n14\t task_type TEXT,\n15\t node_errors TEXT NOT NULL DEFAULT '{}' -- JSON: {\"node-0\": \"error message\"}\n16\t);\n17\t\n18\t-- Table 2: node_settings_version — per-(index, node) settings freshness\n19\tCREATE TABLE IF NOT EXISTS node_settings_version (\n20\t index_uid TEXT NOT NULL,\n21\t node_id TEXT NOT NULL,\n22\t version INTEGER NOT NULL,\n23\t updated_at INTEGER NOT NULL,\n24\t PRIMARY KEY (index_uid, node_id)\n25\t);\n26\t\n27\t-- Table 3: aliases — atomic index aliases (single-target and multi-target)\n28\tCREATE TABLE IF NOT EXISTS aliases (\n29\t name TEXT PRIMARY KEY,\n30\t kind TEXT NOT NULL, -- 'single' | 'multi'\n31\t current_uid TEXT, -- non-null when kind='single'\n32\t target_uids TEXT, -- JSON array of UIDs; non-null when kind='multi'\n33\t version INTEGER NOT NULL, -- monotonic flip counter\n34\t created_at INTEGER NOT NULL,\n35\t history TEXT NOT NULL -- JSON array: last N prior states\n36\t);\n37\t\n38\t-- Table 4: sessions — read-your-writes session pins\n39\tCREATE TABLE IF NOT EXISTS sessions (\n40\t session_id TEXT PRIMARY KEY,\n41\t last_write_mtask_id TEXT, -- nullable: session may exist before any write\n42\t last_write_at INTEGER,\n43\t pinned_group INTEGER, -- group_id that first reached per-group quorum\n44\t min_settings_version INTEGER NOT NULL,\n45\t ttl INTEGER NOT NULL -- expiry timestamp (ms since epoch)\n46\t);\n47\t\n48\t-- Table 5: idempotency_cache — write deduplication\n49\tCREATE TABLE IF NOT EXISTS idempotency_cache (\n50\t key TEXT PRIMARY KEY,\n51\t body_sha256 BLOB NOT NULL,\n52\t miroir_task_id TEXT NOT NULL,\n53\t expires_at INTEGER NOT NULL\n54\t);\n55\t\n56\t-- Table 6: jobs — work-queued background jobs\n57\tCREATE TABLE IF NOT EXISTS jobs (\n58\t id TEXT PRIMARY KEY,\n59\t type TEXT NOT NULL, -- dump_import | reshard_backfill | ...\n60\t params TEXT NOT NULL, -- JSON\n61\t state TEXT NOT NULL, -- queued | in_progress | completed | failed\n62\t claimed_by TEXT, -- pod_id of current claimant\n63\t claim_expires_at INTEGER, -- lease heartbeat expiry\n64\t progress TEXT NOT NULL -- JSON: { bytes_processed, docs_routed, last_cursor, ... }\n65\t);\n66\t\n67\t-- Table 7: leader_lease — singleton-coordinator lease\n68\tCREATE TABLE IF NOT EXISTS leader_lease (\n69\t scope TEXT PRIMARY KEY, -- e.g. \"reshard:\", \"alias_flip:\"\n70\t holder TEXT NOT NULL, -- pod_id of current leader\n71\t expires_at INTEGER NOT NULL -- renewed every 3s with a 10s TTL\n72\t);\n73\t"}]},"parent_tool_use_id":"call_0f9d635724804b359279800d","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"9df3a7d3-2116-4794-aae7-0e253204db5c","timestamp":"2026-05-23T06:37:01.799Z"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_204caa910fc94403b3572c63","type":"tool_result","content":"1\t//! Rebalancer background worker with advisory lock.\n2\t//!\n3\t//! Implements plan §4 \"Rebalancer\" background task:\n4\t//! - Advisory lock via leader_lease (only one pod runs the rebalancer)\n5\t//! - Reacts to topology change events (node add/drain/fail/recover)\n6\t//! - Computes affected shards using the Phase 1 router\n7\t//! - Drives the migration state machine for each affected shard\n8\t//! - Updates Prometheus metrics (plan §10)\n9\t//! - Progress persistence via jobs table for resumability\n10\t\n11\tmod drift_reconciler;\n12\t\n13\t#[cfg(test)]\n14\tmod acceptance_tests;\n15\t\n16\t#[cfg(test)]\n17\tmod settings_broadcast_acceptance_tests;\n18\t\n19\tpub use drift_reconciler::{DriftReconciler, DriftReconcilerConfig};\n20\t\n21\tuse crate::migration::{MigrationCoordinator, MigrationId, MigrationNodeId, ShardId};\n22\tuse crate::rebalancer::{MigrationExecutor, Rebalancer, RebalancerMetrics};\n23\tuse crate::router::assign_shard_in_group;\n24\tuse crate::task_store::{NewJob, TaskStore};\n25\tuse crate::topology::{NodeId as TopologyNodeId, Topology};\n26\tuse serde::{Deserialize, Serialize};\n27\tuse std::collections::HashMap;\n28\tuse std::sync::Arc;\n29\tuse std::time::{Duration, Instant};\n30\tuse tokio::sync::{mpsc, RwLock};\n31\tuse tracing::{debug, error, info};\n32\t\n33\t/// Callback type for recording rebalancer metrics.\n34\t///\n35\t/// Called when:\n36\t/// - Documents are migrated (count)\n37\t/// - Rebalance starts (in_progress = true)\n38\t/// - Rebalance ends (in_progress = false, duration_secs)\n39\tpub type RebalancerMetricsCallback = Arc, Option) + Send + Sync>;\n40\t\n41\t/// Default leader lease TTL in seconds.\n42\tconst LEASE_TTL_SECS: u64 = 10;\n43\t\n44\t/// Default interval for lease renewal checks.\n45\tconst LEASE_RENEWAL_INTERVAL_MS: u64 = 2000;\n46\t\n47\t/// Maximum time to wait for a migration job to complete.\n48\tconst MIGRATION_TIMEOUT_SECS: u64 = 3600;\n49\t\n50\t/// Unique identifier for a rebalance job (per index).\n51\t#[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]\n52\tpub struct RebalanceJobId(pub String);\n53\t\n54\timpl RebalanceJobId {\n55\t /// Create a new rebalance job ID for an index.\n56\t pub fn new(index_uid: &str) -> Self {\n57\t Self(format!(\"rebalance:{}\", index_uid))\n58\t }\n59\t\n60\t /// Get the index UID from the job ID.\n61\t pub fn index_uid(&self) -> &str {\n62\t self.0.strip_prefix(\"rebalance:\").unwrap_or(&self.0)\n63\t }\n64\t}\n65\t\n66\t/// Topology change event that triggers rebalancing.\n67\t#[derive(Debug, Clone, Serialize, Deserialize)]\n68\tpub enum TopologyChangeEvent {\n69\t /// A new node was added to a replica group.\n70\t NodeAdded {\n71\t node_id: String,\n72\t replica_group: u32,\n73\t index_uid: String,\n74\t },\n75\t /// A node is being drained (preparing for removal).\n76\t NodeDraining {\n77\t node_id: String,\n78\t replica_group: u32,\n79\t index_uid: String,\n80\t },\n81\t /// A node failed and needs recovery.\n82\t NodeFailed {\n83\t node_id: String,\n84\t replica_group: u32,\n85\t index_uid: String,\n86\t },\n87\t /// A node recovered after failure.\n88\t NodeRecovered {\n89\t node_id: String,\n90\t replica_group: u32,\n91\t index_uid: String,\n92\t },\n93\t}\n94\t\n95\t/// Per-shard migration progress for persistence.\n96\t#[derive(Debug, Clone, Serialize, Deserialize)]\n97\tpub struct ShardMigrationProgress {\n98\t /// Shard ID.\n99\t pub shard_id: u32,\n100\t /// Current phase.\n101\t pub phase: String,\n102\t /// Documents migrated so far.\n103\t pub docs_migrated: u64,\n104\t /// Last offset for pagination resume.\n105\t pub last_offset: u32,\n106\t /// Source node for migration.\n107\t pub source_node: Option,\n108\t /// Target node for migration.\n109\t pub target_node: String,\n110\t}\n111\t\n112\t/// Per-shard migration state for the worker.\n113\t#[derive(Debug, Clone, Serialize, Deserialize)]\n114\tstruct ShardState {\n115\t /// Current phase.\n116\t phase: ShardMigrationPhase,\n117\t /// Documents migrated so far.\n118\t docs_migrated: u64,\n119\t /// Last offset for pagination resume.\n120\t last_offset: u32,\n121\t /// Source node for migration.\n122\t source_node: Option,\n123\t /// Target node for migration.\n124\t target_node: String,\n125\t /// When this shard migration started.\n126\t #[serde(skip, default = \"Instant::now\")]\n127\t started_at: Instant,\n128\t}\n129\t\n130\t/// Migration phases for a single shard.\n131\t#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]\n132\tpub enum ShardMigrationPhase {\n133\t /// Waiting to start.\n134\t Idle,\n135\t /// Dual-write active.\n136\t DualWriteStarted,\n137\t /// Background migration in progress.\n138\t MigrationInProgress,\n139\t /// Migration complete, preparing cutover.\n140\t MigrationComplete,\n141\t /// Dual-write stopped.\n142\t DualWriteStopped,\n143\t /// Old replica deleted.\n144\t OldReplicaDeleted,\n145\t /// Migration failed.\n146\t Failed,\n147\t}\n148\t\n149\t/// State machine for a rebalance job (per index).\n150\t#[derive(Debug, Clone, Serialize, Deserialize)]\n151\tstruct RebalanceJob {\n152\t /// Job ID.\n153\t id: RebalanceJobId,\n154\t /// Index UID being rebalanced.\n155\t index_uid: String,\n156\t /// Replica group being rebalanced.\n157\t replica_group: u32,\n158\t /// Per-shard migration state.\n159\t shards: HashMap,\n160\t /// Job started at.\n161\t #[serde(skip, default = \"Instant::now\")]\n162\t started_at: Instant,\n163\t /// Job completed at (if finished).\n164\t #[serde(skip, default)]\n165\t completed_at: Option,\n166\t /// Total documents migrated.\n167\t total_docs_migrated: u64,\n168\t /// Whether the job is paused.\n169\t paused: bool,\n170\t}\n171\t\n172\t/// Configuration for the rebalancer worker.\n173\t#[derive(Debug, Clone, Serialize, Deserialize)]\n174\tpub struct RebalancerWorkerConfig {\n175\t /// Maximum concurrent migrations (plan §14.2 memory budget).\n176\t pub max_concurrent_migrations: u32,\n177\t /// Leader lease TTL in seconds.\n178\t pub lease_ttl_secs: u64,\n179\t /// Lease renewal interval in milliseconds.\n180\t pub lease_renewal_interval_ms: u64,\n181\t /// Migration batch size.\n182\t pub migration_batch_size: u32,\n183\t /// Delay between migration batches (ms).\n184\t pub migration_batch_delay_ms: u64,\n185\t /// Channel capacity for topology events.\n186\t pub event_channel_capacity: usize,\n187\t}\n188\t\n189\timpl Default for RebalancerWorkerConfig {\n190\t fn default() -> Self {\n191\t Self {\n192\t max_concurrent_migrations: 4,\n193\t lease_ttl_secs: LEASE_TTL_SECS,\n194\t lease_renewal_interval_ms: LEASE_RENEWAL_INTERVAL_MS,\n195\t migration_batch_size: 1000,\n196\t migration_batch_delay_ms: 100,\n197\t event_channel_capacity: 100,\n198\t }\n199\t }\n200\t}\n201\t\n202\t/// The rebalancer background worker.\n203\t///\n204\t/// Runs as a Tokio task, acquires a leader lease, and processes topology\n205\t/// change events to drive shard migrations.\n206\tpub struct RebalancerWorker {\n207\t config: RebalancerWorkerConfig,\n208\t topology: Arc>,\n209\t task_store: Arc,\n210\t _rebalancer: Arc, // Reserved for future use\n211\t migration_coordinator: Arc>,\n212\t migration_executor: Option>,\n213\t metrics: Arc>,\n214\t pod_id: String,\n215\t /// Sender for topology change events.\n216\t event_tx: mpsc::Sender,\n217\t /// Active rebalance jobs (per index).\n218\t jobs: Arc>>,\n219\t /// Receiver for topology change events (cloned for internal use).\n220\t event_rx: Arc>>>,\n221\t /// Callback for recording Prometheus metrics.\n222\t metrics_callback: Option,\n223\t}\n224\t\n225\timpl RebalancerWorker {\n226\t /// Create a new rebalancer worker.\n227\t pub fn new(\n228\t config: RebalancerWorkerConfig,\n229\t topology: Arc>,\n230\t task_store: Arc,\n231\t rebalancer: Arc, // Reserved for future use\n232\t migration_coordinator: Arc>,\n233\t metrics: Arc>,\n234\t pod_id: String,\n235\t ) -> Self {\n236\t Self::with_metrics(config, topology, task_store, rebalancer, migration_coordinator, metrics, pod_id, None)\n237\t }\n238\t\n239\t /// Create a new rebalancer worker with metrics callback.\n240\t pub fn with_metrics(\n241\t config: RebalancerWorkerConfig,\n242\t topology: Arc>,\n243\t task_store: Arc,\n244\t rebalancer: Arc, // Reserved for future use\n245\t migration_coordinator: Arc>,\n246\t metrics: Arc>,\n247\t pod_id: String,\n248\t metrics_callback: Option,\n249\t ) -> Self {\n250\t let (event_tx, event_rx) = mpsc::channel(config.event_channel_capacity);\n251\t\n252\t Self {\n253\t config,\n254\t topology,\n255\t task_store,\n256\t _rebalancer: rebalancer, // Stored but not currently used\n257\t migration_coordinator,\n258\t migration_executor: None, // Set via with_migration_executor\n259\t metrics,\n260\t pod_id,\n261\t event_tx,\n262\t jobs: Arc::new(RwLock::new(HashMap::new())),\n263\t event_rx: Arc::new(RwLock::new(Some(event_rx))),\n264\t metrics_callback,\n265\t }\n266\t }\n267\t\n268\t /// Set the migration executor (provides HTTP client for actual migrations).\n269\t pub fn with_migration_executor(mut self, executor: Arc) -> Self {\n270\t self.migration_executor = Some(executor);\n271\t self\n272\t }\n273\t\n274\t /// Get a sender for topology change events.\n275\t pub fn event_sender(&self) -> mpsc::Sender {\n276\t self.event_tx.clone()\n277\t }\n278\t\n279\t /// Start the background worker.\n280\t ///\n281\t /// This runs in a loop:\n282\t /// 1. Try to acquire leader lease for each index (scope: rebalance:)\n283\t /// 2. If acquired, process events and run migrations\n284\t /// 3. Renew lease periodically\n285\t /// 4. If lease lost, go back to step 1\n286\t pub async fn run(&self) {\n287\t info!(\n288\t pod_id = %self.pod_id,\n289\t \"rebalancer worker starting\"\n290\t );\n291\t\n292\t loop {\n293\t // Try to acquire leader lease for each index we're managing\n294\t let mut leader_scopes = Vec::new();\n295\t\n296\t // Get all active indexes from current jobs and use default scope\n297\t let jobs = self.jobs.read().await;\n298\t let mut index_uids: Vec = jobs.values()\n299\t .map(|j| j.index_uid.clone())\n300\t .collect();\n301\t\n302\t // Always include \"default\" scope for rebalancer operations\n303\t index_uids.push(\"default\".to_string());\n304\t drop(jobs);\n305\t\n306\t // Build scopes for each index: rebalance:\n307\t let scopes: Vec = index_uids\n308\t .into_iter()\n309\t .map(|uid| format!(\"rebalance:{}\", uid))\n310\t .collect();\n311\t\n312\t let mut acquired_any = false;\n313\t for scope in &scopes {\n314\t let now_ms = now_ms();\n315\t let expires_at = now_ms + (self.config.lease_ttl_secs * 1000) as i64;\n316\t\n317\t match tokio::task::spawn_blocking({\n318\t let task_store = self.task_store.clone();\n319\t let scope = scope.clone();\n320\t let pod_id = self.pod_id.clone();\n321\t move || {\n322\t task_store.try_acquire_leader_lease(&scope, &pod_id, expires_at, now_ms)\n323\t }\n324\t })\n325\t .await\n326\t {\n327\t Ok(Ok(true)) => {\n328\t info!(scope = %scope, pod_id = %self.pod_id, \"acquired leader lease\");\n329\t leader_scopes.push(scope.clone());\n330\t acquired_any = true;\n331\t }\n332\t Ok(Ok(false)) => {\n333\t debug!(scope = %scope, \"leader lease already held\");\n334\t }\n335\t Ok(Err(e)) => {\n336\t error!(scope = %scope, error = %e, \"failed to acquire leader lease\");\n337\t }\n338\t Err(e) => {\n339\t error!(scope = %scope, error = %e, \"spawn_blocking task failed\");\n340\t }\n341\t }\n342\t }\n343\t\n344\t if acquired_any {\n345\t // We are the leader - update rebalancer metrics\n346\t {\n347\t let mut metrics = self.metrics.write().await;\n348\t metrics.start_rebalance();\n349\t }\n350\t\n351\t // Call metrics callback for rebalance start\n352\t if let Some(ref callback) = self.metrics_callback {\n353\t callback(true, None, None);\n354\t }\n355\t\n356\t // We are the leader - run the main loop\n357\t if let Err(e) = self.run_leader_loop(&leader_scopes).await {\n358\t error!(error = %e, \"leader loop failed\");\n359\t }\n360\t\n361\t // Clear rebalancer in-progress status on exit\n362\t {\n363\t let mut metrics = self.metrics.write().await;\n364\t metrics.end_rebalance();\n365\t }\n366\t\n367\t // Call metrics callback for rebalance end\n368\t if let Some(ref callback) = self.metrics_callback {\n369\t callback(false, None, None);\n370\t }\n371\t } else {\n372\t // Not the leader - wait before retrying\n373\t tokio::time::sleep(Duration::from_millis(\n374\t self.config.lease_renewal_interval_ms,\n375\t ))\n376\t .await;\n377\t }\n378\t }\n379\t }\n380\t\n381\t /// Run the leader loop: process events, renew lease, drive migrations.\n382\t async fn run_leader_loop(&self, scopes: &[String]) -> Result<(), String> {\n383\t let mut lease_renewal = tokio::time::interval(Duration::from_millis(\n384\t self.config.lease_renewal_interval_ms,\n385\t ));\n386\t\n387\t // Take the receiver out of the Option\n388\t let mut event_rx = {\n389\t let mut rx_guard = self.event_rx.write().await;\n390\t rx_guard.take().ok_or_else(|| \"event receiver already taken\".to_string())?\n391\t };\n392\t\n393\t let result = async {\n394\t loop {\n395\t tokio::select! {\n396\t // Renew lease periodically\n397\t _ = lease_renewal.tick() => {\n398\t for scope in scopes {\n399\t let now_ms = now_ms();\n400\t let expires_at = now_ms + (self.config.lease_ttl_secs * 1000) as i64;\n401\t\n402\t match tokio::task::spawn_blocking({\n403\t let task_store = self.task_store.clone();\n404\t let scope = scope.clone();\n405\t let pod_id = self.pod_id.clone();\n406\t move || {\n407\t task_store.renew_leader_lease(&scope, &pod_id, expires_at)\n408\t }\n409\t })\n410\t .await\n411\t {\n412\t Ok(Ok(true)) => {\n413\t debug!(scope = %scope, \"renewed leader lease\");\n414\t }\n415\t Ok(Ok(false)) => {\n416\t info!(scope = %scope, \"lost leader lease\");\n417\t return Ok::<(), String>(()); // Exit loop, will retry acquisition\n418\t }\n419\t Ok(Err(e)) => {\n420\t error!(scope = %scope, error = %e, \"failed to renew lease\");\n421\t return Err(format!(\"lease renewal failed: {}\", e));\n422\t }\n423\t Err(e) => {\n424\t error!(scope = %scope, error = %e, \"spawn_blocking task failed\");\n425\t return Err(format!(\"lease renewal task failed: {}\", e));\n426\t }\n427\t }\n428\t }\n429\t }\n430\t\n431\t // Process topology change events\n432\t Some(event) = event_rx.recv() => {\n433\t if let Err(e) = self.handle_topology_event(event).await {\n434\t error!(error = %e, \"failed to handle topology event\");\n435\t }\n436\t }\n437\t\n438\t // Drive active migrations\n439\t _ = tokio::time::sleep(Duration::from_millis(100)) => {\n440\t if let Err(e) = self.drive_migrations().await {\n441\t error!(error = %e, \"failed to drive migrations\");\n442\t }\n443\t }\n444\t }\n445\t }\n446\t }.await;\n447\t\n448\t // Put the receiver back for retry logic\n449\t {\n450\t let mut rx_guard = self.event_rx.write().await;\n451\t if rx_guard.is_none() {\n452\t *rx_guard = Some(event_rx);\n453\t }\n454\t }\n455\t\n456\t result\n457\t }\n458\t\n459\t /// Handle a topology change event.\n460\t async fn handle_topology_event(&self, event: TopologyChangeEvent) -> Result<(), String> {\n461\t info!(event = ?event, \"handling topology change event\");\n462\t\n463\t match event {\n464\t TopologyChangeEvent::NodeAdded {\n465\t node_id,\n466\t replica_group,\n467\t index_uid,\n468\t } => {\n469\t self.on_node_added(&node_id, replica_group, &index_uid)\n470\t .await?\n471\t }\n472\t TopologyChangeEvent::NodeDraining {\n473\t node_id,\n474\t replica_group,\n475\t index_uid,\n476\t } => {\n477\t self.on_node_draining(&node_id, replica_group, &index_uid)\n478\t .await?\n479\t }\n480\t TopologyChangeEvent::NodeFailed {\n481\t node_id,\n482\t replica_group,\n483\t index_uid,\n484\t } => {\n485\t self.on_node_failed(&node_id, replica_group, &index_uid)\n486\t .await?\n487\t }\n488\t TopologyChangeEvent::NodeRecovered {\n489\t node_id,\n490\t replica_group,\n491\t index_uid,\n492\t } => {\n493\t self.on_node_recovered(&node_id, replica_group, &index_uid)\n494\t .await?\n495\t }\n496\t }\n497\t\n498\t Ok(())\n499\t }\n500\t\n501\t /// Handle node addition: compute affected shards and create job to track migration.\n502\t async fn on_node_added(\n503\t &self,\n504\t node_id: &str,\n505\t replica_group: u32,\n506\t index_uid: &str,\n507\t ) -> Result<(), String> {\n508\t let job_id = RebalanceJobId::new(index_uid);\n509\t\n510\t // Check if we already have a job for this index\n511\t {\n512\t let jobs = self.jobs.read().await;\n513\t if jobs.contains_key(&job_id) {\n514\t debug!(index_uid = %index_uid, \"rebalance job already exists\");\n515\t return Ok(());\n516\t }\n517\t }\n518\t\n519\t // Compute affected shards using the Phase 1 router\n520\t let affected_shards = self.compute_affected_shards_for_add(node_id, replica_group).await?;\n521\t\n522\t if affected_shards.is_empty() {\n523\t info!(\n524\t node_id = %node_id,\n525\t replica_group = replica_group,\n526\t \"no shards need migration for node addition\"\n527\t );\n528\t return Ok(());\n529\t }\n530\t\n531\t info!(\n532\t node_id = %node_id,\n533\t replica_group = replica_group,\n534\t shard_count = affected_shards.len(),\n535\t \"computed affected shards for node addition\"\n536\t );\n537\t\n538\t // Build migration state: shard -> old owner mapping\n539\t let mut old_owners = HashMap::new();\n540\t let mut shard_states = HashMap::new();\n541\t for (shard_id, source_node) in &affected_shards {\n542\t old_owners.insert(ShardId(*shard_id), topo_to_migration_node_id(source_node));\n543\t shard_states.insert(\n544\t *shard_id,\n545\t ShardState {\n546\t phase: ShardMigrationPhase::Idle,\n547\t docs_migrated: 0,\n548\t last_offset: 0,\n549\t source_node: Some(source_node.to_string()),\n550\t target_node: node_id.to_string(),\n551\t started_at: Instant::now(),\n552\t },\n553\t );\n554\t }\n555\t\n556\t // Create migration in coordinator for state tracking and dual-write\n557\t let migration_id = {\n558\t let mut coordinator = self.migration_coordinator.write().await;\n559\t let new_node = topo_to_migration_node_id(&TopologyNodeId::new(node_id.to_string()));\n560\t coordinator.begin_migration(new_node, replica_group, old_owners)\n561\t .map_err(|e| format!(\"failed to create migration: {}\", e))?\n562\t };\n563\t\n564\t // Start dual-write immediately so the router starts writing to both nodes\n565\t {\n566\t let mut coordinator = self.migration_coordinator.write().await;\n567\t coordinator.begin_dual_write(migration_id)\n568\t .map_err(|e| format!(\"failed to start dual-write: {}\", e))?;\n569\t }\n570\t\n571\t let job = RebalanceJob {\n572\t id: job_id.clone(),\n573\t index_uid: index_uid.to_string(),\n574\t replica_group,\n575\t shards: shard_states,\n576\t started_at: Instant::now(),\n577\t completed_at: None,\n578\t total_docs_migrated: 0,\n579\t paused: false,\n580\t };\n581\t\n582\t // Persist job to task store\n583\t self.persist_job(&job).await?;\n584\t\n585\t // Store in memory\n586\t let mut jobs = self.jobs.write().await;\n587\t jobs.insert(job_id.clone(), job);\n588\t\n589\t info!(\n590\t migration_id = %migration_id,\n591\t shard_count = affected_shards.len(),\n592\t \"created migration for node addition\"\n593\t );\n594\t\n595\t Ok(())\n596\t }\n597\t\n598\t /// Handle node draining: compute destination shards and create job to track migration.\n599\t async fn on_node_draining(\n600\t &self,\n601\t node_id: &str,\n602\t replica_group: u32,\n603\t index_uid: &str,\n604\t ) -> Result<(), String> {\n605\t let job_id = RebalanceJobId::new(index_uid);\n606\t\n607\t // Compute shard destinations\n608\t let shard_destinations = self\n609\t .compute_shard_destinations_for_drain(node_id, replica_group)\n610\t .await?;\n611\t\n612\t if shard_destinations.is_empty() {\n613\t info!(\n614\t node_id = %node_id,\n615\t replica_group = replica_group,\n616\t \"no shards need migration for node drain\"\n617\t );\n618\t return Ok(());\n619\t }\n620\t\n621\t info!(\n622\t node_id = %node_id,\n623\t replica_group = replica_group,\n624\t shard_count = shard_destinations.len(),\n625\t \"computed shard destinations for node drain\"\n626\t );\n627\t\n628\t // Build migration state: shard -> old owner (draining node) mapping\n629\t let mut old_owners = HashMap::new();\n630\t let mut shard_states = HashMap::new();\n631\t for (shard_id, dest_node) in &shard_destinations {\n632\t old_owners.insert(ShardId(*shard_id), topo_to_migration_node_id(&TopologyNodeId::new(node_id.to_string())));\n633\t shard_states.insert(\n634\t *shard_id,\n635\t ShardState {\n636\t phase: ShardMigrationPhase::Idle,\n637\t docs_migrated: 0,\n638\t last_offset: 0,\n639\t source_node: Some(node_id.to_string()),\n640\t target_node: dest_node.to_string(),\n641\t started_at: Instant::now(),\n642\t },\n643\t );\n644\t }\n645\t\n646\t // Create migration in coordinator for state tracking and dual-write\n647\t let migration_id = {\n648\t let mut coordinator = self.migration_coordinator.write().await;\n649\t // For drain, the destination node becomes the \"new\" node in the migration\n650\t if let Some((_, first_dest)) = shard_destinations.first() {\n651\t let new_node = topo_to_migration_node_id(first_dest);\n652\t coordinator.begin_migration(new_node, replica_group, old_owners)\n653\t .map_err(|e| format!(\"failed to create migration: {}\", e))?\n654\t } else {\n655\t return Err(\"no shards to migrate\".to_string());\n656\t }\n657\t };\n658\t\n659\t // Start dual-write immediately\n660\t {\n661\t let mut coordinator = self.migration_coordinator.write().await;\n662\t coordinator.begin_dual_write(migration_id)\n663\t .map_err(|e| format!(\"failed to start dual-write: {}\", e))?;\n664\t }\n665\t\n666\t let job = RebalanceJob {\n667\t id: job_id.clone(),\n668\t index_uid: index_uid.to_string(),\n669\t replica_group,\n670\t shards: shard_states,\n671\t started_at: Instant::now(),\n672\t completed_at: None,\n673\t total_docs_migrated: 0,\n674\t paused: false,\n675\t };\n676\t\n677\t // Persist job to task store\n678\t self.persist_job(&job).await?;\n679\t\n680\t // Store in memory\n681\t let mut jobs = self.jobs.write().await;\n682\t jobs.insert(job_id.clone(), job);\n683\t\n684\t info!(\n685\t migration_id = %migration_id,\n686\t shard_count = shard_destinations.len(),\n687\t \"created migration for node drain\"\n688\t );\n689\t\n690\t Ok(())\n691\t }\n692\t\n693\t /// Handle node failure.\n694\t async fn on_node_failed(\n695\t &self,\n696\t node_id: &str,\n697\t replica_group: u32,\n698\t index_uid: &str,\n699\t ) -> Result<(), String> {\n700\t info!(\n701\t node_id = %node_id,\n702\t replica_group = replica_group,\n703\t index_uid = %index_uid,\n704\t \"handling node failure\"\n705\t );\n706\t\n707\t // Mark node as failed in topology\n708\t let node_id_obj = TopologyNodeId::new(node_id.to_string());\n709\t {\n710\t let mut topo = self.topology.write().await;\n711\t if let Some(node) = topo.node_mut(&node_id_obj) {\n712\t node.status = crate::topology::NodeStatus::Failed;\n713\t }\n714\t }\n715\t\n716\t // TODO: Schedule replication to restore RF if needed\n717\t // For now, just log the failure\n718\t Ok(())\n719\t }\n720\t\n721\t /// Handle node recovery.\n722\t async fn on_node_recovered(\n723\t &self,\n724\t node_id: &str,\n725\t replica_group: u32,\n726\t index_uid: &str,\n727\t ) -> Result<(), String> {\n728\t info!(\n729\t node_id = %node_id,\n730\t replica_group = replica_group,\n731\t index_uid = %index_uid,\n732\t \"handling node recovery\"\n733\t );\n734\t\n735\t // Mark node as active in topology\n736\t let node_id_obj = TopologyNodeId::new(node_id.to_string());\n737\t {\n738\t let mut topo = self.topology.write().await;\n739\t if let Some(node) = topo.node_mut(&node_id_obj) {\n740\t node.status = crate::topology::NodeStatus::Active;\n741\t }\n742\t }\n743\t\n744\t // TODO: If auto_rebalance_on_recovery is enabled, trigger rebalancing\n745\t\n746\t Ok(())\n747\t }\n748\t\n749\t /// Compute which shards are affected by adding a new node.\n750\t /// Returns shard -> source_node mapping for shards that will move.\n751\t async fn compute_affected_shards_for_add(\n752\t &self,\n753\t new_node_id: &str,\n754\t replica_group: u32,\n755\t ) -> Result, String> {\n756\t let topo = self.topology.read().await;\n757\t let new_node_id = TopologyNodeId::new(new_node_id.to_string());\n758\t let rf = topo.rf();\n759\t\n760\t // Find the target group\n761\t let group = topo\n762\t .groups()\n763\t .find(|g| g.id == replica_group)\n764\t .ok_or_else(|| format!(\"replica group {} not found\", replica_group))?;\n765\t\n766\t let existing_nodes: Vec<_> = group.nodes().iter().cloned().collect();\n767\t let mut affected_shards = Vec::new();\n768\t\n769\t // For each shard, check if adding the new node would change the assignment\n770\t for shard_id in 0..topo.shards {\n771\t let old_assignment: Vec<_> =\n772\t assign_shard_in_group(shard_id, &existing_nodes, rf);\n773\t\n774\t // New assignment with the new node included\n775\t let all_nodes: Vec<_> = existing_nodes\n776\t .iter()\n777\t .cloned()\n778\t .chain(std::iter::once(new_node_id.clone()))\n779\t .collect();\n780\t let new_assignment: Vec<_> = assign_shard_in_group(shard_id, &all_nodes, rf);\n781\t\n782\t // Check if the new node is in the new assignment\n783\t if new_assignment.contains(&new_node_id) {\n784\t // This shard moves to the new node\n785\t if let Some(old_owner) = old_assignment.first() {\n786\t affected_shards.push((shard_id, old_owner.clone()));\n787\t }\n788\t }\n789\t }\n790\t\n791\t Ok(affected_shards)\n792\t }\n793\t\n794\t /// Compute where each shard should go when draining a node.\n795\t /// Returns shard -> destination_node mapping.\n796\t async fn compute_shard_destinations_for_drain(\n797\t &self,\n798\t drain_node_id: &str,\n799\t replica_group: u32,\n800\t ) -> Result, String> {\n801\t let topo = self.topology.read().await;\n802\t let drain_node_id = TopologyNodeId::new(drain_node_id.to_string());\n803\t let rf = topo.rf();\n804\t\n805\t // Find the target group\n806\t let group = topo\n807\t .groups()\n808\t .find(|g| g.id == replica_group)\n809\t .ok_or_else(|| format!(\"replica group {} not found\", replica_group))?;\n810\t\n811\t let other_nodes: Vec<_> = group\n812\t .nodes()\n813\t .iter()\n814\t .filter(|n| **n != drain_node_id)\n815\t .cloned()\n816\t .collect();\n817\t\n818\t if other_nodes.is_empty() {\n819\t return Err(\"cannot remove last node in group\".to_string());\n820\t }\n821\t\n822\t let mut destinations = Vec::new();\n823\t\n824\t // For each shard, find a new owner among the remaining nodes\n825\t for shard_id in 0..topo.shards {\n826\t let assignment: Vec<_> = assign_shard_in_group(shard_id, group.nodes(), rf);\n827\t\n828\t if assignment.contains(&drain_node_id) {\n829\t // This shard needs a new home\n830\t let mut best_node = None;\n831\t let mut best_score = 0u64;\n832\t\n833\t for node in &other_nodes {\n834\t let s = crate::router::score(shard_id, node.as_str());\n835\t if s > best_score {\n836\t best_score = s;\n837\t best_node = Some(node.clone());\n838\t }\n839\t }\n840\t\n841\t if let Some(dest) = best_node {\n842\t destinations.push((shard_id, dest));\n843\t }\n844\t }\n845\t }\n846\t\n847\t Ok(destinations)\n848\t }\n849\t\n850\t /// Drive active migrations forward.\n851\t async fn drive_migrations(&self) -> Result<(), String> {\n852\t let jobs = self.jobs.read().await;\n853\t let mut active_jobs = Vec::new();\n854\t\n855\t for (job_id, job) in jobs.iter() {\n856\t if job.paused || job.completed_at.is_some() {\n857\t continue;\n858\t }\n859\t\n860\t // Count how many shards are actively migrating\n861\t let migrating_count = job\n862\t .shards\n863\t .values()\n864\t .filter(|s| {\n865\t matches!(\n866\t s.phase,\n867\t ShardMigrationPhase::MigrationInProgress\n868\t | ShardMigrationPhase::DualWriteStarted\n869\t )\n870\t })\n871\t .count();\n872\t\n873\t if migrating_count < self.config.max_concurrent_migrations as usize {\n874\t active_jobs.push((job_id.clone(), job.clone()));\n875\t }\n876\t }\n877\t\n878\t // Drop read lock before processing\n879\t drop(jobs);\n880\t\n881\t // Process up to max_concurrent_migrations jobs\n882\t for (job_id, job) in active_jobs\n883\t .into_iter()\n884\t .take(self.config.max_concurrent_migrations as usize)\n885\t {\n886\t if let Err(e) = self.process_job(&job_id).await {\n887\t error!(job_id = %job_id.0, error = %e, \"failed to process job\");\n888\t }\n889\t }\n890\t\n891\t Ok(())\n892\t }\n893\t\n894\t /// Emit Prometheus metrics for the current rebalancer state.\n895\t pub async fn emit_metrics(&self) {\n896\t let jobs = self.jobs.read().await;\n897\t\n898\t // Calculate total documents migrated across all jobs\n899\t let total_docs: u64 = jobs.values()\n900\t .map(|j| j.total_docs_migrated)\n901\t .sum();\n902\t\n903\t // Check if any rebalance is in progress\n904\t let in_progress = jobs.values().any(|j| j.completed_at.is_none() && !j.paused);\n905\t\n906\t drop(jobs);\n907\t\n908\t // Update internal metrics\n909\t {\n910\t let mut metrics = self.metrics.write().await;\n911\t if in_progress {\n912\t metrics.start_rebalance();\n913\t } else {\n914\t metrics.end_rebalance();\n915\t }\n916\t // Note: documents_migrated_total is already tracked in RebalancerMetrics\n917\t // and synced to Prometheus via the health checker\n918\t let _ = total_docs;\n919\t }\n920\t\n921\t // Call metrics callback for rebalance status\n922\t if let Some(ref callback) = self.metrics_callback {\n923\t callback(in_progress, None, None);\n924\t }\n925\t }\n926\t\n927\t /// Get the current rebalancer status for monitoring.\n928\t pub async fn get_status(&self) -> RebalancerWorkerStatus {\n929\t let jobs = self.jobs.read().await;\n930\t\n931\t let active_jobs = jobs.values()\n932\t .filter(|j| j.completed_at.is_none() && !j.paused)\n933\t .count();\n934\t\n935\t let completed_jobs = jobs.values()\n936\t .filter(|j| j.completed_at.is_some())\n937\t .count();\n938\t\n939\t let paused_jobs = jobs.values()\n940\t .filter(|j| j.paused)\n941\t .count();\n942\t\n943\t let total_shards: usize = jobs.values()\n944\t .map(|j| j.shards.len())\n945\t .sum();\n946\t\n947\t let completed_shards: usize = jobs.values()\n948\t .map(|j| j.shards.values().filter(|s| s.phase == ShardMigrationPhase::OldReplicaDeleted).count())\n949\t .sum();\n950\t\n951\t RebalancerWorkerStatus {\n952\t active_jobs,\n953\t completed_jobs,\n954\t paused_jobs,\n955\t total_shards,\n956\t completed_shards,\n957\t }\n958\t }\n959\t\n960\t /// Process a single rebalance job.\n961\t ///\n962\t /// Drives the migration state machine forward for each shard in the job.\n963\t /// This is the core method that advances migrations through their phases.\n964\t async fn process_job(&self, job_id: &RebalanceJobId) -> Result<(), String> {\n965\t // Get job (cloned to avoid holding lock)\n966\t let job = {\n967\t let jobs = self.jobs.read().await;\n968\t jobs.get(job_id).cloned()\n969\t };\n970\t\n971\t let mut job = match job {\n972\t Some(j) => j,\n973\t None => return Ok(()), // Job may have been removed\n974\t };\n975\t\n976\t // Skip paused or completed jobs\n977\t if job.paused || job.completed_at.is_some() {\n978\t return Ok(());\n979\t }\n980\t\n981\t // Sync worker job state with MigrationCoordinator state\n982\t // This ensures we resume from the correct phase after a pod restart\n983\t self.sync_job_with_coordinator(&mut job).await?;\n984\t\n985\t // Get the migration from the coordinator for this job\n986\t let migration_id = {\n987\t let coordinator = self.migration_coordinator.read().await;\n988\t let mut found_id = None;\n989\t for (mid, state) in coordinator.get_all_migrations() {\n990\t // Match by index_uid and replica_group\n991\t if state.replica_group == job.replica_group {\n992\t found_id = Some(*mid);\n993\t break;\n994\t }\n995\t }\n996\t found_id.ok_or_else(|| \"no migration found for this job\".to_string())?\n997\t };\n998\t\n999\t // Get migration state to access node addresses\n1000\t let (new_node, old_owners) = {\n1001\t let coordinator = self.migration_coordinator.read().await;\n1002\t let state = coordinator.get_state(migration_id)\n1003\t .ok_or_else(|| \"migration state not found\".to_string())?;\n1004\t (state.new_node.clone(), state.old_owners.clone())\n1005\t };\n1006\t\n1007\t // Get node addresses from topology\n1008\t let (new_node_address, old_owner_addresses) = {\n1009\t let topo = self.topology.read().await;\n1010\t let new_addr = topo.node(&migration_to_topo_node_id(&new_node))\n1011\t .ok_or_else(|| format!(\"new node not found: {}\", new_node.0))?\n1012\t .address.clone();\n1013\t\n1014\t let mut old_addrs = HashMap::new();\n1015\t for (shard, old_node) in &old_owners {\n1016\t if let Some(node) = topo.node(&migration_to_topo_node_id(old_node)) {\n1017\t old_addrs.insert(*shard, node.address.clone());\n1018\t }\n1019\t }\n1020\t\n1021\t (new_addr, old_addrs)\n1022\t };\n1023\t\n1024\t // Use a default index for now - in production, this would come from config\n1025\t let index_uid = \"default\".to_string();\n1026\t\n1027\t // Drive migrations forward for each shard\n1028\t let mut updated = false;\n1029\t let mut total_docs_migrated = 0u64;\n1030\t\n1031\t // Limit concurrent migrations to stay within memory budget\n1032\t let mut active_count = 0;\n1033\t\n1034\t for (&shard_id, shard_state) in job.shards.iter_mut() {\n1035\t // Check concurrent migration limit\n1036\t if active_count >= self.config.max_concurrent_migrations as usize {\n1037\t break;\n1038\t }\n1039\t\n1040\t match shard_state.phase {\n1041\t ShardMigrationPhase::Idle => {\n1042\t // Already started dual-write in on_node_added/on_node_draining\n1043\t shard_state.phase = ShardMigrationPhase::DualWriteStarted;\n1044\t updated = true;\n1045\t }\n1046\t ShardMigrationPhase::DualWriteStarted => {\n1047\t // Start background migration\n1048\t if let Some(ref executor) = self.migration_executor {\n1049\t if let Some(old_address) = old_owner_addresses.get(&ShardId(shard_id)) {\n1050\t let old_node = old_owners.get(&ShardId(shard_id))\n1051\t .cloned()\n1052\t .unwrap_or_else(|| crate::migration::NodeId(\"unknown\".to_string()));\n1053\t if let Err(e) = self.execute_background_migration(\n1054\t executor,\n1055\t migration_id,\n1056\t shard_id,\n1057\t &old_node,\n1058\t old_address,\n1059\t &new_node.0,\n1060\t &new_node_address,\n1061\t &index_uid,\n1062\t ).await {\n1063\t error!(shard_id, error = %e, \"failed to execute background migration\");\n1064\t shard_state.phase = ShardMigrationPhase::Failed;\n1065\t } else {\n1066\t shard_state.phase = ShardMigrationPhase::MigrationInProgress;\n1067\t active_count += 1;\n1068\t updated = true;\n1069\t }\n1070\t }\n1071\t } else {\n1072\t // No executor - skip directly to complete for testing\n1073\t shard_state.docs_migrated = 1000; // Simulated\n1074\t shard_state.phase = ShardMigrationPhase::MigrationComplete;\n1075\t updated = true;\n1076\t }\n1077\t }\n1078\t ShardMigrationPhase::MigrationInProgress => {\n1079\t // Check if migration is complete by querying the coordinator\n1080\t let complete = self.check_migration_complete_for_shard(shard_id).await?;\n1081\t if complete {\n1082\t shard_state.phase = ShardMigrationPhase::MigrationComplete;\n1083\t active_count -= 1; // One less active migration\n1084\t updated = true;\n1085\t }\n1086\t }\n1087\t ShardMigrationPhase::MigrationComplete => {\n1088\t // Begin cutover sequence\n1089\t if let Err(e) = self.begin_cutover_for_shard(shard_id).await {\n1090\t error!(shard_id, error = %e, \"failed to begin cutover\");\n1091\t } else {\n1092\t shard_state.phase = ShardMigrationPhase::DualWriteStopped;\n1093\t updated = true;\n1094\t }\n1095\t }\n1096\t ShardMigrationPhase::DualWriteStopped => {\n1097\t // Complete cutover and delete old replica\n1098\t if let Err(e) = self.complete_cutover_for_shard(shard_id).await {\n1099\t error!(shard_id, error = %e, \"failed to complete cutover\");\n1100\t } else {\n1101\t shard_state.phase = ShardMigrationPhase::OldReplicaDeleted;\n1102\t updated = true;\n1103\t }\n1104\t }\n1105\t ShardMigrationPhase::OldReplicaDeleted => {\n1106\t // Migration complete for this shard\n1107\t }\n1108\t ShardMigrationPhase::Failed => {\n1109\t // Migration failed - skip this shard\n1110\t }\n1111\t }\n1112\t\n1113\t total_docs_migrated += shard_state.docs_migrated;\n1114\t }\n1115\t\n1116\t // Update total docs migrated for the job\n1117\t job.total_docs_migrated = total_docs_migrated;\n1118\t\n1119\t // Update metrics\n1120\t {\n1121\t let mut metrics = self.metrics.write().await;\n1122\t metrics.record_documents_migrated(total_docs_migrated);\n1123\t }\n1124\t\n1125\t // Call metrics callback for documents migrated\n1126\t if let Some(ref callback) = self.metrics_callback {\n1127\t callback(false, Some(total_docs_migrated), None);\n1128\t }\n1129\t\n1130\t // Check if job is complete (all shards in final state)\n1131\t let all_complete = job.shards.values().all(|s| {\n1132\t matches!(s.phase, ShardMigrationPhase::OldReplicaDeleted | ShardMigrationPhase::Failed)\n1133\t });\n1134\t\n1135\t if all_complete && job.completed_at.is_none() {\n1136\t job.completed_at = Some(Instant::now());\n1137\t\n1138\t // Record final duration metric\n1139\t let duration = job.started_at.elapsed().as_secs_f64();\n1140\t {\n1141\t let mut metrics = self.metrics.write().await;\n1142\t metrics.end_rebalance();\n1143\t info!(\n1144\t job_id = %job_id.0,\n1145\t duration_secs = duration,\n1146\t \"rebalance job completed\"\n1147\t );\n1148\t }\n1149\t\n1150\t // Call metrics callback for rebalance completion with duration\n1151\t if let Some(ref callback) = self.metrics_callback {\n1152\t callback(false, None, Some(duration));\n1153\t }\n1154\t\n1155\t // Update job in memory\n1156\t let mut jobs = self.jobs.write().await;\n1157\t jobs.insert(job_id.clone(), job.clone());\n1158\t\n1159\t // Persist to task store\n1160\t self.persist_job(&job).await?;\n1161\t\n1162\t // Persist progress for each shard\n1163\t for shard_id in job.shards.keys() {\n1164\t self.persist_job_progress(&job, *shard_id).await?;\n1165\t }\n1166\t }\n1167\t\n1168\t Ok(())\n1169\t }\n1170\t\n1171\t /// Persist a job to the task store.\n1172\t async fn persist_job(&self, job: &RebalanceJob) -> Result<(), String> {\n1173\t let progress = serde_json::to_string(job)\n1174\t .map_err(|e| format!(\"failed to serialize job: {}\", e))?;\n1175\t\n1176\t let new_job = NewJob {\n1177\t id: job.id.0.clone(),\n1178\t type_: \"rebalance\".to_string(),\n1179\t params: progress,\n1180\t state: if job.completed_at.is_some() {\n1181\t \"completed\".to_string()\n1182\t } else if job.paused {\n1183\t \"paused\".to_string()\n1184\t } else {\n1185\t \"running\".to_string()\n1186\t },\n1187\t progress: format!(\n1188\t \"{{\\\"total_shards\\\":{},\\\"completed\\\":{},\\\"docs_migrated\\\":{}}}\",\n1189\t job.shards.len(),\n1190\t job.shards\n1191\t .values()\n1192\t .filter(|s| s.phase == ShardMigrationPhase::OldReplicaDeleted)\n1193\t .count(),\n1194\t job.total_docs_migrated\n1195\t ),\n1196\t };\n1197\t\n1198\t tokio::task::spawn_blocking({\n1199\t let task_store = self.task_store.clone();\n1200\t let new_job = new_job.clone();\n1201\t move || {\n1202\t task_store.insert_job(&new_job)\n1203\t }\n1204\t })\n1205\t .await\n1206\t .map_err(|e| format!(\"failed to persist job: {}\", e))?\n1207\t .map_err(|e| format!(\"failed to persist job: {}\", e))?;\n1208\t\n1209\t Ok(())\n1210\t }\n1211\t\n1212\t /// Persist progress for a single shard.\n1213\t async fn persist_job_progress(\n1214\t &self,\n1215\t job: &RebalanceJob,\n1216\t shard_id: u32,\n1217\t ) -> Result<(), String> {\n1218\t if let Some(shard_state) = job.shards.get(&shard_id) {\n1219\t let progress = ShardMigrationProgress {\n1220\t shard_id,\n1221\t phase: format!(\"{:?}\", shard_state.phase),\n1222\t docs_migrated: shard_state.docs_migrated,\n1223\t last_offset: shard_state.last_offset,\n1224\t source_node: shard_state.source_node.clone(),\n1225\t target_node: shard_state.target_node.clone(),\n1226\t };\n1227\t\n1228\t let progress_json =\n1229\t serde_json::to_string(&progress)\n1230\t .map_err(|e| format!(\"failed to serialize progress: {}\", e))?;\n1231\t\n1232\t // Update job progress in task store\n1233\t tokio::task::spawn_blocking({\n1234\t let task_store = self.task_store.clone();\n1235\t let job_id = job.id.0.clone();\n1236\t let completed_at = format!(\"{:?}\", job.completed_at.is_some());\n1237\t let progress_json = progress_json.clone();\n1238\t move || {\n1239\t task_store.update_job_progress(&job_id, &completed_at, &progress_json)\n1240\t }\n1241\t })\n1242\t .await\n1243\t .map_err(|e| format!(\"failed to update job progress: {}\", e))?\n1244\t .map_err(|e| format!(\"failed to update job progress: {}\", e))?;\n1245\t }\n1246\t\n1247\t Ok(())\n1248\t }\n1249\t\n1250\t /// Sync worker job state with MigrationCoordinator state.\n1251\t ///\n1252\t /// This ensures that after a pod restart, the worker's job state reflects\n1253\t /// the actual migration state tracked by the coordinator.\n1254\t async fn sync_job_with_coordinator(&self, job: &mut RebalanceJob) -> Result<(), String> {\n1255\t let coordinator = self.migration_coordinator.read().await;\n1256\t\n1257\t // For each shard in the job, check if there's a corresponding migration\n1258\t // in the coordinator and sync the state\n1259\t for (&shard_id, shard_state) in job.shards.iter_mut() {\n1260\t let shard = ShardId(shard_id);\n1261\t\n1262\t // Look for a migration in the coordinator that affects this shard\n1263\t for (_mid, migration_state) in coordinator.get_all_migrations() {\n1264\t if let Some(migration_shard_state) = migration_state.affected_shards.get(&shard) {\n1265\t // Sync the phase based on the migration coordinator state\n1266\t use crate::migration::ShardMigrationState as CoordinatorState;\n1267\t shard_state.phase = match migration_shard_state {\n1268\t CoordinatorState::Pending => ShardMigrationPhase::Idle,\n1269\t CoordinatorState::Migrating { .. } => ShardMigrationPhase::MigrationInProgress,\n1270\t CoordinatorState::MigrationComplete { docs_copied } => {\n1271\t shard_state.docs_migrated = *docs_copied;\n1272\t ShardMigrationPhase::MigrationComplete\n1273\t }\n1274\t CoordinatorState::Draining { .. } => ShardMigrationPhase::DualWriteStopped,\n1275\t CoordinatorState::DeltaPass { docs_copied, delta_docs_copied } => {\n1276\t shard_state.docs_migrated = docs_copied + delta_docs_copied;\n1277\t ShardMigrationPhase::DualWriteStopped\n1278\t }\n1279\t CoordinatorState::Active => ShardMigrationPhase::OldReplicaDeleted,\n1280\t CoordinatorState::Failed { .. } => ShardMigrationPhase::Failed,\n1281\t };\n1282\t }\n1283\t }\n1284\t }\n1285\t\n1286\t Ok(())\n1287\t }\n1288\t\n1289\t /// Start dual-write phase for a shard.\n1290\t async fn start_dual_write_for_shard(&self, _replica_group: u32, shard_id: u32) -> Result<(), String> {\n1291\t let shard = ShardId(shard_id);\n1292\t let mut coordinator = self.migration_coordinator.write().await;\n1293\t\n1294\t // Find or create the migration for this shard\n1295\t // For now, we'll create a new migration if one doesn't exist\n1296\t // In production, this would be created when the job is created\n1297\t\n1298\t info!(\n1299\t shard_id,\n1300\t \"starting dual-write phase\"\n1301\t );\n1302\t\n1303\t // The dual-write is handled by the router checking is_dual_write_active\n1304\t // We just need to ensure the migration coordinator knows about this shard\n1305\t Ok(())\n1306\t }\n1307\t\n1308\t /// Begin cutover sequence for a shard.\n1309\t async fn begin_cutover_for_shard(&self, shard_id: u32) -> Result<(), String> {\n1310\t info!(\n1311\t shard_id,\n1312\t \"beginning cutover sequence\"\n1313\t );\n1314\t\n1315\t let shard = ShardId(shard_id);\n1316\t let mut coordinator = self.migration_coordinator.write().await;\n1317\t\n1318\t // Collect the migrations that affect this shard first\n1319\t let migrations_to_cutover: Vec<_> = coordinator.get_all_migrations()\n1320\t .iter()\n1321\t .filter(|(_, migration_state)| migration_state.affected_shards.contains_key(&shard))\n1322\t .map(|(mid, _)| *mid)\n1323\t .collect();\n1324\t\n1325\t // Now perform the cutover\n1326\t for mid in migrations_to_cutover {\n1327\t coordinator.begin_cutover(mid).map_err(|e| e.to_string())?;\n1328\t break; // Only need to cutover one migration per shard\n1329\t }\n1330\t\n1331\t Ok(())\n1332\t }\n1333\t\n1334\t /// Complete cutover and delete old replica for a shard.\n1335\t async fn complete_cutover_for_shard(&self, shard_id: u32) -> Result<(), String> {\n1336\t info!(\n1337\t shard_id,\n1338\t \"completing cutover and deleting old replica\"\n1339\t );\n1340\t\n1341\t let shard = ShardId(shard_id);\n1342\t let mut coordinator = self.migration_coordinator.write().await;\n1343\t\n1344\t // Collect the migrations that affect this shard first\n1345\t let migrations_to_complete: Vec<_> = coordinator.get_all_migrations()\n1346\t .iter()\n1347\t .filter(|(_, migration_state)| migration_state.affected_shards.contains_key(&shard))\n1348\t .map(|(mid, _)| *mid)\n1349\t .collect();\n1350\t\n1351\t // Now complete the cleanup\n1352\t for mid in migrations_to_complete {\n1353\t coordinator.complete_drain(mid).map_err(|e| e.to_string())?;\n1354\t coordinator.complete_cleanup(mid).map_err(|e| e.to_string())?;\n1355\t break; // Only need to complete one migration per shard\n1356\t }\n1357\t\n1358\t Ok(())\n1359\t }\n1360\t\n1361\t /// Start background migration for a shard.\n1362\t async fn start_background_migration_for_shard(&self, shard_id: u32) -> Result<(), String> {\n1363\t info!(\n1364\t shard_id,\n1365\t \"starting background migration\"\n1366\t );\n1367\t\n1368\t // The actual migration is handled by the Rebalancer component's migration executor\n1369\t // This method just signals that we're ready for background migration to proceed\n1370\t Ok(())\n1371\t }\n1372\t\n1373\t /// Check if migration is complete for a shard.\n1374\t async fn check_migration_complete_for_shard(&self, shard_id: u32) -> Result {\n1375\t let shard = ShardId(shard_id);\n1376\t let coordinator = self.migration_coordinator.read().await;\n1377\t\n1378\t // Check if the migration coordinator has marked this shard as complete\n1379\t for (_mid, migration_state) in coordinator.get_all_migrations() {\n1380\t if let Some(shard_state) = migration_state.affected_shards.get(&shard) {\n1381\t use crate::migration::ShardMigrationState as CoordinatorState;\n1382\t if matches!(shard_state, CoordinatorState::MigrationComplete { .. }) {\n1383\t return Ok(true);\n1384\t }\n1385\t }\n1386\t }\n1387\t\n1388\t Ok(false)\n1389\t }\n1390\t\n1391\t /// Execute background migration for a shard.\n1392\t ///\n1393\t /// This performs the actual document migration from source to target node\n1394\t /// using pagination to stay within memory bounds.\n1395\t async fn execute_background_migration(\n1396\t &self,\n1397\t executor: &Arc,\n1398\t migration_id: MigrationId,\n1399\t shard_id: u32,\n1400\t old_node_id: &MigrationNodeId,\n1401\t old_address: &str,\n1402\t new_node_id: &str,\n1403\t new_address: &str,\n1404\t index_uid: &str,\n1405\t ) -> Result<(), String> {\n1406\t info!(\n1407\t migration_id = %migration_id,\n1408\t shard_id,\n1409\t from = %old_node_id.0,\n1410\t to = %new_node_id,\n1411\t \"starting shard migration\"\n1412\t );\n1413\t\n1414\t // Paginate through all documents for this shard\n1415\t let mut offset = 0u32;\n1416\t let limit = self.config.migration_batch_size;\n1417\t let mut total_docs_copied = 0u64;\n1418\t\n1419\t loop {\n1420\t // Fetch documents from source\n1421\t let (docs, _total) = executor.fetch_documents(\n1422\t &old_node_id.0,\n1423\t old_address,\n1424\t index_uid,\n1425\t shard_id,\n1426\t limit,\n1427\t offset,\n1428\t ).await.map_err(|e| format!(\"fetch failed: {}\", e))?;\n1429\t\n1430\t if docs.is_empty() {\n1431\t break; // No more documents\n1432\t }\n1433\t\n1434\t // Write documents to target\n1435\t executor.write_documents(\n1436\t new_node_id,\n1437\t new_address,\n1438\t index_uid,\n1439\t docs.clone(),\n1440\t ).await.map_err(|e| format!(\"write failed: {}\", e))?;\n1441\t\n1442\t total_docs_copied += docs.len() as u64;\n1443\t offset += limit;\n1444\t\n1445\t // Throttle if configured\n1446\t if self.config.migration_batch_delay_ms > 0 {\n1447\t tokio::time::sleep(Duration::from_millis(\n1448\t self.config.migration_batch_delay_ms,\n1449\t ))\n1450\t .await;\n1451\t }\n1452\t }\n1453\t\n1454\t // Mark shard migration complete in coordinator\n1455\t {\n1456\t let mut coordinator = self.migration_coordinator.write().await;\n1457\t coordinator.shard_migration_complete(migration_id, ShardId(shard_id), total_docs_copied)\n1458\t .map_err(|e| format!(\"failed to mark shard complete: {}\", e))?;\n1459\t }\n1460\t\n1461\t // Update metrics\n1462\t {\n1463\t let mut metrics = self.metrics.write().await;\n1464\t metrics.record_documents_migrated(total_docs_copied);\n1465\t }\n1466\t\n1467\t // Call metrics callback for documents migrated\n1468\t if let Some(ref callback) = self.metrics_callback {\n1469\t callback(false, Some(total_docs_copied), None);\n1470\t }\n1471\t\n1472\t info!(\n1473\t migration_id = %migration_id,\n1474\t shard_id,\n1475\t docs_copied = total_docs_copied,\n1476\t \"shard migration complete\"\n1477\t );\n1478\t\n1479\t Ok(())\n1480\t }\n1481\t\n1482\t /// Pause an in-progress rebalance.\n1483\t\n1484\t /// Pause an in-progress rebalance.\n1485\t pub async fn pause_rebalance(&self, index_uid: &str) -> Result<(), String> {\n1486\t let job_id = RebalanceJobId::new(index_uid);\n1487\t let mut jobs = self.jobs.write().await;\n1488\t\n1489\t if let Some(job) = jobs.get_mut(&job_id) {\n1490\t job.paused = true;\n1491\t info!(index_uid = %index_uid, \"paused rebalance\");\n1492\t Ok(())\n1493\t } else {\n1494\t Err(format!(\"no rebalance job found for index {}\", index_uid))\n1495\t }\n1496\t }\n1497\t\n1498\t /// Resume a paused rebalance.\n1499\t pub async fn resume_rebalance(&self, index_uid: &str) -> Result<(), String> {\n1500\t let job_id = RebalanceJobId::new(index_uid);\n1501\t let mut jobs = self.jobs.write().await;\n1502\t\n1503\t if let Some(job) = jobs.get_mut(&job_id) {\n1504\t job.paused = false;\n1505\t info!(index_uid = %index_uid, \"resumed rebalance\");\n1506\t Ok(())\n1507\t } else {\n1508\t Err(format!(\"no rebalance job found for index {}\", index_uid))\n1509\t }\n1510\t }\n1511\t\n1512\t /// Load persisted jobs from task store on startup.\n1513\t pub async fn load_persisted_jobs(&self) -> Result<(), String> {\n1514\t let jobs = tokio::task::spawn_blocking({\n1515\t let task_store = self.task_store.clone();\n1516\t move || {\n1517\t task_store.list_jobs_by_state(\"running\")\n1518\t }\n1519\t })\n1520\t .await\n1521\t .map_err(|e| format!(\"failed to list jobs: {}\", e))?\n1522\t .map_err(|e| format!(\"failed to list jobs: {}\", e))?;\n1523\t\n1524\t for job_row in jobs {\n1525\t if job_row.type_ == \"rebalance\" {\n1526\t if let Ok(job) = serde_json::from_str::(&job_row.params) {\n1527\t info!(\n1528\t index_uid = %job.index_uid,\n1529\t \"loaded persisted rebalance job\"\n1530\t );\n1531\t let mut jobs = self.jobs.write().await;\n1532\t jobs.insert(job.id.clone(), job);\n1533\t }\n1534\t }\n1535\t }\n1536\t\n1537\t Ok(())\n1538\t }\n1539\t}\n1540\t\n1541\t/// Status of the rebalancer worker for monitoring.\n1542\t#[derive(Debug, Clone, Serialize, Deserialize)]\n1543\tpub struct RebalancerWorkerStatus {\n1544\t /// Number of active rebalance jobs.\n1545\t pub active_jobs: usize,\n1546\t /// Number of completed rebalance jobs.\n1547\t pub completed_jobs: usize,\n1548\t /// Number of paused rebalance jobs.\n1549\t pub paused_jobs: usize,\n1550\t /// Total number of shards across all jobs.\n1551\t pub total_shards: usize,\n1552\t /// Number of completed shard migrations.\n1553\t pub completed_shards: usize,\n1554\t}\n1555\t\n1556\t/// Get current time in milliseconds since Unix epoch.\n1557\tfn now_ms() -> i64 {\n1558\t std::time::SystemTime::now()\n1559\t .duration_since(std::time::UNIX_EPOCH)\n1560\t .unwrap_or_default()\n1561\t .as_millis() as i64\n1562\t}\n1563\t\n1564\t/// Convert a topology NodeId to a migration NodeId.\n1565\tfn topo_to_migration_node_id(id: &TopologyNodeId) -> MigrationNodeId {\n1566\t crate::migration::NodeId(id.as_str().to_string())\n1567\t}\n1568\t\n1569\t/// Convert a migration NodeId to a topology NodeId.\n1570\tfn migration_to_topo_node_id(id: &MigrationNodeId) -> TopologyNodeId {\n1571\t TopologyNodeId::new(id.0.clone())\n1572\t}\n1573\t\n1574\t/// Get the old node owner for a specific shard.\n1575\tfn old_node_owners_for_shard(old_owners: &HashMap, shard_id: u32) -> MigrationNodeId {\n1576\t old_owners.get(&ShardId(shard_id))\n1577\t .cloned()\n1578\t .unwrap_or_else(|| crate::migration::NodeId(\"unknown\".to_string()))\n1579\t}\n1580\t\n1581\t#[cfg(test)]\n1582\tmod tests {\n1583\t use super::*;\n1584\t use crate::config::MiroirConfig;\n1585\t use crate::migration::MigrationConfig;\n1586\t use crate::topology::Node;\n1587\t use std::sync::Arc;\n1588\t\n1589\t fn test_topology() -> Topology {\n1590\t let mut topo = Topology::new(64, 2, 2);\n1591\t topo.add_node(Node::new(\n1592\t TopologyNodeId::new(\"node-0\".into()),\n1593\t \"http://node-0:7700\".into(),\n1594\t 0,\n1595\t ));\n1596\t topo.add_node(Node::new(\n1597\t TopologyNodeId::new(\"node-1\".into()),\n1598\t \"http://node-1:7700\".into(),\n1599\t 0,\n1600\t ));\n1601\t topo.add_node(Node::new(\n1602\t TopologyNodeId::new(\"node-2\".into()),\n1603\t \"http://node-2:7700\".into(),\n1604\t 1,\n1605\t ));\n1606\t topo.add_node(Node::new(\n1607\t TopologyNodeId::new(\"node-3\".into()),\n1608\t \"http://node-3:7700\".into(),\n1609\t 1,\n1610\t ));\n1611\t topo\n1612\t }\n1613\t\n1614\t #[test]\n1615\t fn test_rebalance_job_id() {\n1616\t let job_id = RebalanceJobId::new(\"test-index\");\n1617\t assert_eq!(job_id.0, \"rebalance:test-index\");\n1618\t assert_eq!(job_id.index_uid(), \"test-index\");\n1619\t }\n1620\t\n1621\t #[test]\n1622\t fn test_worker_config_default() {\n1623\t let config = RebalancerWorkerConfig::default();\n1624\t assert_eq!(config.max_concurrent_migrations, 4);\n1625\t assert_eq!(config.lease_ttl_secs, LEASE_TTL_SECS);\n1626\t assert_eq!(config.lease_renewal_interval_ms, LEASE_RENEWAL_INTERVAL_MS);\n1627\t }\n1628\t\n1629\t #[tokio::test]\n1630\t async fn test_compute_affected_shards_for_add() {\n1631\t let topo = Arc::new(RwLock::new(test_topology()));\n1632\t let config = RebalancerWorkerConfig::default();\n1633\t\n1634\t // Create a mock task store (in-memory for testing)\n1635\t // Note: This would need a proper mock TaskStore implementation\n1636\t // For now, we'll skip the full integration test\n1637\t\n1638\t // Test that adding a node to group 0 affects some shards\n1639\t let new_node_id = \"node-new\";\n1640\t let replica_group = 0;\n1641\t\n1642\t // We'd need to instantiate the worker with a proper mock task store\n1643\t // This is a placeholder for the actual test\n1644\t }\n1645\t\n1646\t #[test]\n1647\t fn test_shard_migration_phase_serialization() {\n1648\t let phase = ShardMigrationPhase::MigrationInProgress;\n1649\t let json = serde_json::to_string(&phase).unwrap();\n1650\t assert!(json.contains(\"MigrationInProgress\"));\n1651\t\n1652\t let deserialized: ShardMigrationPhase = serde_json::from_str(&json).unwrap();\n1653\t assert_eq!(deserialized, phase);\n1654\t }\n1655\t\n1656\t #[test]\n1657\t fn test_topology_event_serialization() {\n1658\t let event = TopologyChangeEvent::NodeAdded {\n1659\t node_id: \"node-4\".to_string(),\n1660\t replica_group: 0,\n1661\t index_uid: \"test\".to_string(),\n1662\t };\n1663\t\n1664\t let json = serde_json::to_string(&event).unwrap();\n1665\t assert!(json.contains(\"NodeAdded\"));\n1666\t\n1667\t let deserialized: TopologyChangeEvent = serde_json::from_str(&json).unwrap();\n1668\t match deserialized {\n1669\t TopologyChangeEvent::NodeAdded {\n1670\t node_id,\n1671\t replica_group,\n1672\t index_uid,\n1673\t } => {\n1674\t assert_eq!(node_id, \"node-4\");\n1675\t assert_eq!(replica_group, 0);\n1676\t assert_eq!(index_uid, \"test\");\n1677\t }\n1678\t _ => panic!(\"wrong event type\"),\n1679\t }\n1680\t }\n1681\t}\n1682\t"}]},"parent_tool_use_id":"call_0f9d635724804b359279800d","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"6cab8a52-c652-44e0-8cac-cf4f04904504","timestamp":"2026-05-23T06:37:03.273Z"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_10e8934ce21b4780899df600","type":"tool_result","content":"1\t//! Cluster rebalancer for elastic topology operations.\n2\t//!\n3\t//! Implements plan §2 topology changes and §4 rebalancer:\n4\t//! - Node addition (within a group)\n5\t//! - Replica-group addition\n6\t//! - Node removal (drain)\n7\t//! - Group removal\n8\t//! - Unplanned node failure handling\n9\t//!\n10\t//! The rebalancer coordinates shard migrations using the migration coordinator\n11\t//! and provides admin API endpoints for topology operations.\n12\t\n13\tuse crate::migration::{MigrationCoordinator, MigrationId, MigrationConfig, MigrationError, NodeId as MigrationNodeId, ShardId};\n14\tuse crate::task_store::TaskStore;\n15\tuse crate::topology::{Node, NodeId as TopologyNodeId, NodeStatus, Topology};\n16\tuse crate::router::{assign_shard_in_group, score};\n17\tuse serde::{Deserialize, Serialize};\n18\tuse std::collections::HashMap;\n19\tuse std::sync::Arc;\n20\tuse std::time::{Duration, Instant};\n21\tuse tokio::sync::RwLock;\n22\tuse tracing::{debug, error, info, instrument, warn};\n23\t\n24\t/// Callback type for recording rebalancer metrics.\n25\tpub type RebalancerMetricsCallback = Arc;\n26\t\n27\t/// Convert a topology NodeId to a migration NodeId.\n28\tfn topo_to_migration_node_id(id: &TopologyNodeId) -> MigrationNodeId {\n29\t MigrationNodeId(id.as_str().to_string())\n30\t}\n31\t\n32\t/// Convert a migration NodeId to a topology NodeId.\n33\tfn migration_to_topo_node_id(id: &MigrationNodeId) -> TopologyNodeId {\n34\t TopologyNodeId::new(id.0.clone())\n35\t}\n36\t\n37\t/// Configuration for the rebalancer.\n38\t#[derive(Debug, Clone, Serialize, Deserialize)]\n39\tpub struct RebalancerConfig {\n40\t /// Maximum concurrent shard migrations.\n41\t pub max_concurrent_migrations: u32,\n42\t /// Timeout for a single migration operation.\n43\t pub migration_timeout_s: u64,\n44\t /// Whether to automatically rebalance on node recovery.\n45\t pub auto_rebalance_on_recovery: bool,\n46\t /// Batch size for document migration.\n47\t pub migration_batch_size: u32,\n48\t /// Delay between migration batches (ms).\n49\t pub migration_batch_delay_ms: u64,\n50\t}\n51\t\n52\timpl Default for RebalancerConfig {\n53\t fn default() -> Self {\n54\t Self {\n55\t max_concurrent_migrations: 4,\n56\t migration_timeout_s: 3600,\n57\t auto_rebalance_on_recovery: true,\n58\t migration_batch_size: 1000,\n59\t migration_batch_delay_ms: 100,\n60\t }\n61\t }\n62\t}\n63\t\n64\t/// Type of topology operation.\n65\t#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]\n66\t#[serde(rename_all = \"snake_case\")]\n67\tpub enum TopologyOperationType {\n68\t /// Adding a new node to an existing replica group.\n69\t AddNode,\n70\t /// Removing a node from a replica group.\n71\t RemoveNode,\n72\t /// Draining a node before removal.\n73\t DrainNode,\n74\t /// Adding a new replica group.\n75\t AddReplicaGroup,\n76\t /// Removing an entire replica group.\n77\t RemoveReplicaGroup,\n78\t /// Handling a failed node.\n79\t NodeFailure,\n80\t}\n81\t\n82\t/// Status of a topology operation.\n83\t#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]\n84\t#[serde(rename_all = \"snake_case\")]\n85\tpub enum TopologyOperationStatus {\n86\t /// Operation is pending.\n87\t Pending,\n88\t /// Operation is in progress.\n89\t InProgress,\n90\t /// Operation completed successfully.\n91\t Complete,\n92\t /// Operation failed.\n93\t Failed,\n94\t /// Operation was cancelled.\n95\t Cancelled,\n96\t}\n97\t\n98\t/// A topology operation (node/group add/remove/drain).\n99\t#[derive(Debug, Clone, Serialize, Deserialize)]\n100\tpub struct TopologyOperation {\n101\t /// Unique operation ID.\n102\t pub id: u64,\n103\t /// Type of operation.\n104\t pub op_type: TopologyOperationType,\n105\t /// Current status.\n106\t pub status: TopologyOperationStatus,\n107\t /// Target node ID (for node operations).\n108\t pub target_node: Option,\n109\t /// Target replica group ID (for group operations).\n110\t pub target_group: Option,\n111\t /// Shard migrations in progress for this operation.\n112\t pub migrations: Vec,\n113\t /// Start time.\n114\t pub started_at: Option,\n115\t /// Completion time.\n116\t pub completed_at: Option,\n117\t /// Error message if failed.\n118\t pub error: Option,\n119\t}\n120\t\n121\t/// Result of a topology operation request.\n122\t#[derive(Debug, Clone, Serialize, Deserialize)]\n123\tpub struct TopologyOperationResult {\n124\t /// Operation ID.\n125\t pub id: u64,\n126\t /// Status message.\n127\t pub message: String,\n128\t /// Number of shard migrations initiated.\n129\t pub migrations_count: usize,\n130\t}\n131\t\n132\t/// Status of all ongoing topology operations.\n133\t#[derive(Debug, Clone, Serialize, Deserialize)]\n134\tpub struct RebalanceStatus {\n135\t /// Whether a rebalance is currently in progress.\n136\t pub in_progress: bool,\n137\t /// Active topology operations.\n138\t pub operations: Vec,\n139\t /// Active migration details.\n140\t pub migrations: HashMap,\n141\t}\n142\t\n143\t/// Status of a single migration.\n144\t#[derive(Debug, Clone, Serialize, Deserialize)]\n145\tpub struct MigrationStatus {\n146\t /// Migration ID.\n147\t pub id: u64,\n148\t /// New node ID.\n149\t pub new_node: String,\n150\t /// Replica group.\n151\t pub replica_group: u32,\n152\t /// Current phase.\n153\t pub phase: String,\n154\t /// Affected shards count.\n155\t pub shards_count: usize,\n156\t /// Completed shards count.\n157\t pub completed_count: usize,\n158\t}\n159\t\n160\t/// Request to add a node to a replica group.\n161\t#[derive(Debug, Clone, Deserialize)]\n162\tpub struct AddNodeRequest {\n163\t /// Node ID.\n164\t pub id: String,\n165\t /// Node address.\n166\t pub address: String,\n167\t /// Replica group to join.\n168\t pub replica_group: u32,\n169\t}\n170\t\n171\t/// Request to remove a node from the cluster.\n172\t#[derive(Debug, Clone, Deserialize)]\n173\tpub struct RemoveNodeRequest {\n174\t /// Node ID to remove.\n175\t pub node_id: String,\n176\t /// Force removal without draining (dangerous).\n177\t pub force: bool,\n178\t}\n179\t\n180\t/// Request to drain a node (prepare for removal).\n181\t#[derive(Debug, Clone, Deserialize)]\n182\tpub struct DrainNodeRequest {\n183\t /// Node ID to drain.\n184\t pub node_id: String,\n185\t}\n186\t\n187\t/// Request to add a replica group.\n188\t#[derive(Debug, Clone, Deserialize)]\n189\tpub struct AddReplicaGroupRequest {\n190\t /// Group ID.\n191\t pub group_id: u32,\n192\t /// Initial nodes in the group.\n193\t pub nodes: Vec,\n194\t}\n195\t\n196\t/// Node specification for group addition.\n197\t#[derive(Debug, Clone, Deserialize)]\n198\tpub struct GroupNodeSpec {\n199\t /// Node ID.\n200\t pub id: String,\n201\t /// Node address.\n202\t pub address: String,\n203\t}\n204\t\n205\t/// Request to remove a replica group.\n206\t#[derive(Debug, Clone, Deserialize)]\n207\tpub struct RemoveReplicaGroupRequest {\n208\t /// Group ID to remove.\n209\t pub group_id: u32,\n210\t /// Force removal without draining.\n211\t pub force: bool,\n212\t}\n213\t\n214\t/// Rebalancer error types.\n215\t#[derive(Debug, thiserror::Error)]\n216\tpub enum RebalancerError {\n217\t #[error(\"node not found: {0}\")]\n218\t NodeNotFound(String),\n219\t\n220\t #[error(\"replica group not found: {0}\")]\n221\t GroupNotFound(u32),\n222\t\n223\t #[error(\"operation already in progress for node: {0}\")]\n224\t OperationInProgress(String),\n225\t\n226\t #[error(\"invalid topology state: {0}\")]\n227\t InvalidState(String),\n228\t\n229\t #[error(\"migration error: {0}\")]\n230\t MigrationError(#[from] MigrationError),\n231\t\n232\t #[error(\"timeout: {0}\")]\n233\t Timeout(String),\n234\t\n235\t #[error(\"cannot remove last node in group\")]\n236\t CannotRemoveLastNode,\n237\t\n238\t #[error(\"replica group {0} is not empty\")]\n239\t GroupNotEmpty(u32),\n240\t}\n241\t\n242\t/// Migration executor: performs the actual document migration between nodes.\n243\t///\n244\t/// This trait allows the rebalancer core to remain agnostic to the HTTP client\n245\t/// implementation while still performing actual migrations.\n246\t#[async_trait::async_trait]\n247\tpub trait MigrationExecutor: Send + Sync {\n248\t /// Fetch documents from a source node for a specific shard.\n249\t async fn fetch_documents(\n250\t &self,\n251\t source_node: &str,\n252\t source_address: &str,\n253\t index_uid: &str,\n254\t shard_id: u32,\n255\t limit: u32,\n256\t offset: u32,\n257\t ) -> std::result::Result<(Vec, u64), String>;\n258\t\n259\t /// Write documents to a target node.\n260\t async fn write_documents(\n261\t &self,\n262\t target_node: &str,\n263\t target_address: &str,\n264\t index_uid: &str,\n265\t documents: Vec,\n266\t ) -> std::result::Result<(), String>;\n267\t\n268\t /// Delete documents from a node by shard filter.\n269\t async fn delete_shard(\n270\t &self,\n271\t node: &str,\n272\t node_address: &str,\n273\t index_uid: &str,\n274\t shard_id: u32,\n275\t ) -> std::result::Result<(), String>;\n276\t}\n277\t\n278\t/// Rebalancer metrics for Prometheus emission.\n279\t#[derive(Debug, Clone, Default)]\n280\tpub struct RebalancerMetrics {\n281\t /// Total number of documents migrated.\n282\t pub documents_migrated_total: u64,\n283\t /// Number of currently active migrations.\n284\t pub active_migrations: u64,\n285\t /// Start time of the current rebalance operation.\n286\t pub rebalance_start_time: Option,\n287\t}\n288\t\n289\timpl RebalancerMetrics {\n290\t /// Record that documents were migrated.\n291\t pub fn record_documents_migrated(&mut self, count: u64) {\n292\t self.documents_migrated_total += count;\n293\t }\n294\t\n295\t /// Increment active migrations count.\n296\t pub fn increment_active_migrations(&mut self) {\n297\t self.active_migrations += 1;\n298\t }\n299\t\n300\t /// Decrement active migrations count.\n301\t pub fn decrement_active_migrations(&mut self) {\n302\t self.active_migrations = self.active_migrations.saturating_sub(1);\n303\t }\n304\t\n305\t /// Start a rebalance operation.\n306\t pub fn start_rebalance(&mut self) {\n307\t self.rebalance_start_time = Some(Instant::now());\n308\t }\n309\t\n310\t /// End a rebalance operation and return duration in seconds.\n311\t pub fn end_rebalance(&mut self) -> f64 {\n312\t self.rebalance_start_time\n313\t .take()\n314\t .map(|t| t.elapsed().as_secs_f64())\n315\t .unwrap_or(0.0)\n316\t }\n317\t\n318\t /// Get the current rebalance duration in seconds.\n319\t pub fn current_duration_secs(&self) -> f64 {\n320\t self.rebalance_start_time\n321\t .map(|t| t.elapsed().as_secs_f64())\n322\t .unwrap_or(0.0)\n323\t }\n324\t}\n325\t\n326\t/// The cluster rebalancer orchestrates topology changes.\n327\tpub struct Rebalancer {\n328\t config: RebalancerConfig,\n329\t topology: Arc>,\n330\t migration_coordinator: Arc>,\n331\t operations: Arc>>,\n332\t next_op_id: Arc,\n333\t active_migrations: Arc>>, // migration -> operation ID\n334\t migration_executor: Option>,\n335\t /// Metrics for rebalancer operations.\n336\t pub metrics: Arc>,\n337\t /// Task store for leader lease (P4.1 background worker).\n338\t task_store: Option>,\n339\t /// This pod's ID for leader election.\n340\t pod_id: Option,\n341\t /// Leader lease scope prefix.\n342\t leader_scope: String,\n343\t /// Callback for recording Prometheus metrics.\n344\t metrics_callback: Option,\n345\t}\n346\t\n347\timpl Rebalancer {\n348\t /// Create a new rebalancer.\n349\t pub fn new(\n350\t config: RebalancerConfig,\n351\t topology: Arc>,\n352\t migration_config: MigrationConfig,\n353\t ) -> Self {\n354\t let coordinator = Arc::new(RwLock::new(MigrationCoordinator::new(migration_config)));\n355\t\n356\t Self {\n357\t config,\n358\t topology,\n359\t migration_coordinator: coordinator,\n360\t operations: Arc::new(RwLock::new(HashMap::new())),\n361\t next_op_id: Arc::new(std::sync::atomic::AtomicU64::new(1)),\n362\t active_migrations: Arc::new(RwLock::new(HashMap::new())),\n363\t migration_executor: None,\n364\t metrics: Arc::new(RwLock::new(RebalancerMetrics::default())),\n365\t task_store: None,\n366\t pod_id: None,\n367\t leader_scope: \"rebalance:global\".to_string(),\n368\t metrics_callback: None,\n369\t }\n370\t }\n371\t\n372\t /// Set the task store for leader lease (P4.1 background worker).\n373\t pub fn with_task_store(mut self, task_store: Arc) -> Self {\n374\t self.task_store = Some(task_store);\n375\t self\n376\t }\n377\t\n378\t /// Set the pod ID for leader election.\n379\t pub fn with_pod_id(mut self, pod_id: String) -> Self {\n380\t self.pod_id = Some(pod_id);\n381\t self\n382\t }\n383\t\n384\t /// Set the leader lease scope.\n385\t pub fn with_leader_scope(mut self, scope: String) -> Self {\n386\t self.leader_scope = scope;\n387\t self\n388\t }\n389\t\n390\t /// Set the metrics callback for Prometheus emission.\n391\t pub fn with_metrics_callback(mut self, callback: RebalancerMetricsCallback) -> Self {\n392\t self.metrics_callback = Some(callback);\n393\t self\n394\t }\n395\t\n396\t /// Set the migration executor (provides HTTP client for actual migrations).\n397\t pub fn with_migration_executor(mut self, executor: Arc) -> Self {\n398\t self.migration_executor = Some(executor);\n399\t self\n400\t }\n401\t\n402\t /// Emit a metric via the metrics callback (if configured).\n403\t fn emit_metric(&self, name: &str, value: f64) {\n404\t if let Some(ref callback) = self.metrics_callback {\n405\t callback(name, value);\n406\t }\n407\t }\n408\t\n409\t /// Run the background rebalancer worker (P4.1).\n410\t ///\n411\t /// This method runs in a loop, periodically checking for topology changes\n412\t /// and triggering rebalancing as needed. Uses leader lease to ensure only\n413\t /// one pod runs the rebalancer at a time.\n414\t #[instrument(skip_all, fields(pod_id = ?self.pod_id))]\n415\t pub async fn run_background(&self) -> Result<(), RebalancerError> {\n416\t let Some(ref task_store) = self.task_store else {\n417\t return Err(RebalancerError::InvalidState(\n418\t \"task_store required for background worker\".into(),\n419\t ));\n420\t };\n421\t\n422\t let Some(ref pod_id) = self.pod_id else {\n423\t return Err(RebalancerError::InvalidState(\n424\t \"pod_id required for background worker\".into(),\n425\t ));\n426\t };\n427\t\n428\t let check_interval = Duration::from_millis(5000); // Check every 5 seconds\n429\t let mut interval = tokio::time::interval(check_interval);\n430\t let mut leader_lease_interval = tokio::time::interval(Duration::from_secs(3));\n431\t\n432\t info!(\n433\t config = ?self.config,\n434\t \"rebalancer background worker started\"\n435\t );\n436\t\n437\t loop {\n438\t tokio::select! {\n439\t _ = interval.tick() => {\n440\t if self.is_leader(task_store, pod_id).await {\n441\t if let Err(e) = self.check_and_rebalance().await {\n442\t error!(error = %e, \"background rebalance check failed\");\n443\t }\n444\t }\n445\t }\n446\t _ = leader_lease_interval.tick() => {\n447\t if self.is_leader(task_store, pod_id).await {\n448\t self.renew_leader_lease(task_store, pod_id).await;\n449\t }\n450\t }\n451\t }\n452\t }\n453\t }\n454\t\n455\t /// Check if this pod is the leader for rebalancing.\n456\t async fn is_leader(&self, task_store: &Arc, pod_id: &str) -> bool {\n457\t let now = now_ms() as i64;\n458\t let lease_ttl = now + 15000; // 15 second TTL\n459\t\n460\t task_store\n461\t .try_acquire_leader_lease(&self.leader_scope, pod_id, lease_ttl, now)\n462\t .unwrap_or(false)\n463\t }\n464\t\n465\t /// Renew the leader lease.\n466\t async fn renew_leader_lease(&self, task_store: &Arc, pod_id: &str) {\n467\t let now = now_ms() as i64;\n468\t let lease_ttl = now + 15000; // 15 second TTL\n469\t\n470\t let _ = task_store\n471\t .renew_leader_lease(&self.leader_scope, pod_id, lease_ttl);\n472\t }\n473\t\n474\t /// Check for topology changes and trigger rebalancing if needed.\n475\t async fn check_and_rebalance(&self) -> Result<(), RebalancerError> {\n476\t debug!(\"checking for topology changes\");\n477\t\n478\t let topology = self.topology.read().await;\n479\t\n480\t // Check for nodes in Joining state\n481\t let joining_nodes: Vec<_> = topology\n482\t .nodes()\n483\t .filter(|n| n.status == NodeStatus::Joining)\n484\t .map(|n| (n.id.clone(), n.replica_group, n.address.clone()))\n485\t .collect();\n486\t\n487\t // Check for nodes in Draining state\n488\t let draining_nodes: Vec<_> = topology\n489\t .nodes()\n490\t .filter(|n| n.status == NodeStatus::Draining)\n491\t .map(|n| (n.id.clone(), n.replica_group))\n492\t .collect();\n493\t\n494\t // Check for nodes in Failed state\n495\t let failed_nodes: Vec<_> = topology\n496\t .nodes()\n497\t .filter(|n| n.status == NodeStatus::Failed)\n498\t .map(|n| (n.id.clone(), n.replica_group))\n499\t .collect();\n500\t\n501\t // Drop topology read lock before starting operations\n502\t drop(topology);\n503\t\n504\t // Trigger rebalance for joining nodes\n505\t for (node_id, replica_group, address) in joining_nodes {\n506\t info!(node_id = %node_id, replica_group, \"detected joining node\");\n507\t\n508\t // Check if there's already an operation in progress for this node\n509\t let ops = self.operations.read().await;\n510\t let already_in_progress = ops.values().any(|o| {\n511\t o.target_node.as_ref() == Some(&node_id.as_str().to_string())\n512\t && o.status == TopologyOperationStatus::InProgress\n513\t });\n514\t drop(ops);\n515\t\n516\t if !already_in_progress {\n517\t let request = AddNodeRequest {\n518\t id: node_id.as_str().to_string(),\n519\t address,\n520\t replica_group,\n521\t };\n522\t if let Err(e) = self.add_node(request).await {\n523\t warn!(error = %e, \"failed to start rebalance for joining node\");\n524\t }\n525\t }\n526\t }\n527\t\n528\t // Trigger rebalance for draining nodes\n529\t for (node_id, replica_group) in draining_nodes {\n530\t info!(node_id = %node_id, replica_group, \"detected draining node\");\n531\t\n532\t let ops = self.operations.read().await;\n533\t let already_in_progress = ops.values().any(|o| {\n534\t o.target_node.as_ref() == Some(&node_id.as_str().to_string())\n535\t && matches!(\n536\t o.op_type,\n537\t TopologyOperationType::DrainNode | TopologyOperationType::RemoveNode\n538\t )\n539\t && o.status == TopologyOperationStatus::InProgress\n540\t });\n541\t drop(ops);\n542\t\n543\t if !already_in_progress {\n544\t let request = DrainNodeRequest {\n545\t node_id: node_id.as_str().to_string(),\n546\t };\n547\t if let Err(e) = self.drain_node(request).await {\n548\t warn!(error = %e, \"failed to start rebalance for draining node\");\n549\t }\n550\t }\n551\t }\n552\t\n553\t // Handle failed nodes\n554\t for (node_id, replica_group) in failed_nodes {\n555\t info!(node_id = %node_id, replica_group, \"detected failed node\");\n556\t\n557\t let ops = self.operations.read().await;\n558\t let already_handled = ops.values().any(|o| {\n559\t o.target_node.as_ref() == Some(&node_id.as_str().to_string())\n560\t && o.op_type == TopologyOperationType::NodeFailure\n561\t });\n562\t drop(ops);\n563\t\n564\t if !already_handled {\n565\t if let Err(e) = self.handle_node_failure(node_id.as_str()).await {\n566\t warn!(error = %e, \"failed to handle node failure\");\n567\t }\n568\t }\n569\t }\n570\t\n571\t Ok(())\n572\t }\n573\t\n574\t /// Get current rebalance status.\n575\t pub async fn status(&self) -> RebalanceStatus {\n576\t let ops = self.operations.read().await;\n577\t let coordinator = self.migration_coordinator.read().await;\n578\t\n579\t let in_progress = ops.values().any(|o| o.status == TopologyOperationStatus::InProgress);\n580\t\n581\t let mut migrations: HashMap = HashMap::new();\n582\t for op in ops.values() {\n583\t for &mid in &op.migrations {\n584\t if let Some(state) = coordinator.get_state(mid) {\n585\t let key = format!(\"{}\", mid);\n586\t let status = MigrationStatus {\n587\t id: mid.0,\n588\t new_node: state.new_node.to_string(),\n589\t replica_group: state.replica_group,\n590\t phase: state.phase.to_string(),\n591\t shards_count: state.affected_shards.len(),\n592\t completed_count: state\n593\t .affected_shards\n594\t .values()\n595\t .filter(|s| matches!(s, crate::migration::ShardMigrationState::Active))\n596\t .count(),\n597\t };\n598\t migrations.insert(key, status);\n599\t }\n600\t }\n601\t }\n602\t\n603\t RebalanceStatus {\n604\t in_progress,\n605\t operations: ops.values().cloned().collect(),\n606\t migrations,\n607\t }\n608\t }\n609\t\n610\t /// Add a node to a replica group.\n611\t pub async fn add_node(\n612\t &self,\n613\t request: AddNodeRequest,\n614\t ) -> Result {\n615\t info!(\n616\t node_id = %request.id,\n617\t group = request.replica_group,\n618\t \"starting node addition\"\n619\t );\n620\t\n621\t // Check if node already exists\n622\t {\n623\t let topo = self.topology.read().await;\n624\t if topo.node(&TopologyNodeId::new(request.id.clone())).is_some() {\n625\t return Err(RebalancerError::InvalidState(format!(\n626\t \"node {} already exists\",\n627\t request.id\n628\t )));\n629\t }\n630\t }\n631\t\n632\t // Create operation record\n633\t let op_id = self.next_op_id.fetch_add(1, std::sync::atomic::Ordering::SeqCst);\n634\t\n635\t // Add node to topology in Joining state\n636\t {\n637\t let mut topo = self.topology.write().await;\n638\t let group_count = topo.groups().count() as u32;\n639\t if request.replica_group >= group_count {\n640\t return Err(RebalancerError::GroupNotFound(request.replica_group));\n641\t }\n642\t\n643\t let node = Node::new(\n644\t TopologyNodeId::new(request.id.clone()),\n645\t request.address.clone(),\n646\t request.replica_group,\n647\t );\n648\t topo.add_node(node);\n649\t }\n650\t\n651\t // Compute affected shards (shards that will move to new node)\n652\t let affected_shards = self.compute_shard_moves_for_new_node(&request.id, request.replica_group).await?;\n653\t\n654\t // Create migration for each affected shard\n655\t let mut migrations = Vec::new();\n656\t {\n657\t let mut coordinator = self.migration_coordinator.write().await;\n658\t\n659\t for (shard, old_owner) in affected_shards {\n660\t let mut old_owners = HashMap::new();\n661\t old_owners.insert(shard, topo_to_migration_node_id(&old_owner));\n662\t\n663\t let mid = coordinator.begin_migration(\n664\t topo_to_migration_node_id(&TopologyNodeId::new(request.id.clone())),\n665\t request.replica_group,\n666\t old_owners,\n667\t )?;\n668\t\n669\t // Start dual-write\n670\t coordinator.begin_dual_write(mid)?;\n671\t\n672\t // Track migration\n673\t {\n674\t let mut active = self.active_migrations.write().await;\n675\t active.insert(mid, op_id);\n676\t }\n677\t\n678\t migrations.push(mid);\n679\t }\n680\t }\n681\t\n682\t // Record operation\n683\t let node_id_for_result = request.id.clone();\n684\t let migrations_count = migrations.len();\n685\t let operation = TopologyOperation {\n686\t id: op_id,\n687\t op_type: TopologyOperationType::AddNode,\n688\t status: TopologyOperationStatus::InProgress,\n689\t target_node: Some(request.id),\n690\t target_group: Some(request.replica_group),\n691\t migrations: migrations.clone(),\n692\t started_at: Some(now_ms()),\n693\t completed_at: None,\n694\t error: None,\n695\t };\n696\t\n697\t {\n698\t let mut ops = self.operations.write().await;\n699\t ops.insert(op_id, operation);\n700\t }\n701\t\n702\t // Start metrics tracking\n703\t {\n704\t let mut metrics = self.metrics.write().await;\n705\t metrics.start_rebalance();\n706\t }\n707\t\n708\t // Start background migration task\n709\t let topo_arc = self.topology.clone();\n710\t let coord_arc = self.migration_coordinator.clone();\n711\t let ops_arc = self.operations.clone();\n712\t let active_arc = self.active_migrations.clone();\n713\t let config = self.config.clone();\n714\t let executor = self.migration_executor.clone();\n715\t let metrics_arc = self.metrics.clone();\n716\t\n717\t tokio::spawn(async move {\n718\t if let Err(e) = run_migration_task(\n719\t topo_arc,\n720\t coord_arc,\n721\t ops_arc,\n722\t active_arc,\n723\t op_id,\n724\t migrations,\n725\t config,\n726\t executor,\n727\t metrics_arc,\n728\t )\n729\t .await\n730\t {\n731\t error!(error = %e, op_id = op_id, \"migration task failed\");\n732\t }\n733\t });\n734\t\n735\t Ok(TopologyOperationResult {\n736\t id: op_id,\n737\t message: format!(\n738\t \"Node {} addition started with {} shard migrations\",\n739\t node_id_for_result,\n740\t migrations_count\n741\t ),\n742\t migrations_count,\n743\t })\n744\t }\n745\t\n746\t /// Drain a node (prepare for removal).\n747\t pub async fn drain_node(\n748\t &self,\n749\t request: DrainNodeRequest,\n750\t ) -> Result {\n751\t info!(node_id = %request.node_id, \"starting node drain\");\n752\t\n753\t // Check if node exists\n754\t let node_id = TopologyNodeId::new(request.node_id.clone());\n755\t let (node_status, replica_group) = {\n756\t let topo = self.topology.read().await;\n757\t let node = topo.node(&node_id).ok_or_else(|| {\n758\t RebalancerError::NodeNotFound(request.node_id.clone())\n759\t })?;\n760\t\n761\t // Check if this is the last node in the group\n762\t let group = topo\n763\t .groups()\n764\t .find(|g| g.id == node.replica_group)\n765\t .ok_or_else(|| RebalancerError::GroupNotFound(node.replica_group))?;\n766\t\n767\t if group.nodes().len() <= 1 {\n768\t return Err(RebalancerError::CannotRemoveLastNode);\n769\t }\n770\t\n771\t (node.status, node.replica_group)\n772\t };\n773\t\n774\t if node_status == NodeStatus::Draining {\n775\t return Err(RebalancerError::OperationInProgress(\n776\t request.node_id.clone(),\n777\t ));\n778\t }\n779\t\n780\t // Create operation record\n781\t let op_id = self.next_op_id.fetch_add(1, std::sync::atomic::Ordering::SeqCst);\n782\t\n783\t // Mark node as draining\n784\t {\n785\t let mut topo = self.topology.write().await;\n786\t if let Some(node) = topo.node_mut(&node_id) {\n787\t node.status = NodeStatus::Draining;\n788\t }\n789\t }\n790\t\n791\t // Compute shard destinations (where each shard goes)\n792\t let shard_destinations = self.compute_shard_destinations_for_drain(&request.node_id, replica_group).await?;\n793\t\n794\t // Create migrations for each shard\n795\t let mut migrations = Vec::new();\n796\t {\n797\t let mut coordinator = self.migration_coordinator.write().await;\n798\t\n799\t for (shard, dest_node) in shard_destinations {\n800\t let mid = coordinator.begin_migration(\n801\t topo_to_migration_node_id(&dest_node),\n802\t replica_group,\n803\t [(shard, topo_to_migration_node_id(&node_id))].into_iter().collect(),\n804\t )?;\n805\t\n806\t coordinator.begin_dual_write(mid)?;\n807\t\n808\t {\n809\t let mut active = self.active_migrations.write().await;\n810\t active.insert(mid, op_id);\n811\t }\n812\t\n813\t migrations.push(mid);\n814\t }\n815\t }\n816\t\n817\t // Record operation\n818\t let operation = TopologyOperation {\n819\t id: op_id,\n820\t op_type: TopologyOperationType::DrainNode,\n821\t status: TopologyOperationStatus::InProgress,\n822\t target_node: Some(request.node_id.clone()),\n823\t target_group: Some(replica_group),\n824\t migrations: migrations.clone(),\n825\t started_at: Some(now_ms()),\n826\t completed_at: None,\n827\t error: None,\n828\t };\n829\t\n830\t {\n831\t let mut ops = self.operations.write().await;\n832\t ops.insert(op_id, operation);\n833\t }\n834\t\n835\t // Start metrics tracking\n836\t {\n837\t let mut metrics = self.metrics.write().await;\n838\t metrics.start_rebalance();\n839\t }\n840\t\n841\t // Start background migration task\n842\t let migrations_count = migrations.len();\n843\t let topo_arc = self.topology.clone();\n844\t let coord_arc = self.migration_coordinator.clone();\n845\t let ops_arc = self.operations.clone();\n846\t let active_arc = self.active_migrations.clone();\n847\t let config = self.config.clone();\n848\t let drain_node_id = request.node_id.clone();\n849\t let executor = self.migration_executor.clone();\n850\t let metrics_arc = self.metrics.clone();\n851\t\n852\t tokio::spawn(async move {\n853\t if let Err(e) = run_drain_task(\n854\t topo_arc,\n855\t coord_arc,\n856\t ops_arc,\n857\t active_arc,\n858\t op_id,\n859\t migrations,\n860\t config,\n861\t drain_node_id,\n862\t executor,\n863\t metrics_arc,\n864\t )\n865\t .await\n866\t {\n867\t error!(error = %e, op_id = op_id, \"drain task failed\");\n868\t }\n869\t });\n870\t\n871\t Ok(TopologyOperationResult {\n872\t id: op_id,\n873\t message: format!(\n874\t \"Node {} drain started with {} shard migrations\",\n875\t request.node_id,\n876\t migrations_count\n877\t ),\n878\t migrations_count,\n879\t })\n880\t }\n881\t\n882\t /// Remove a node from the cluster (after drain).\n883\t pub async fn remove_node(\n884\t &self,\n885\t request: RemoveNodeRequest,\n886\t ) -> Result {\n887\t info!(node_id = %request.node_id, force = request.force, \"starting node removal\");\n888\t\n889\t let node_id = TopologyNodeId::new(request.node_id.clone());\n890\t\n891\t // Check node state\n892\t let node_status = {\n893\t let topo = self.topology.read().await;\n894\t let node = topo.node(&node_id).ok_or_else(|| {\n895\t RebalancerError::NodeNotFound(request.node_id.clone())\n896\t })?;\n897\t\n898\t // Check if this is the last node in the group\n899\t let group = topo\n900\t .groups()\n901\t .find(|g| g.id == node.replica_group)\n902\t .ok_or_else(|| RebalancerError::GroupNotFound(node.replica_group))?;\n903\t\n904\t if group.nodes().len() <= 1 {\n905\t return Err(RebalancerError::CannotRemoveLastNode);\n906\t }\n907\t\n908\t node.status\n909\t };\n910\t\n911\t if !request.force && node_status != NodeStatus::Draining {\n912\t return Err(RebalancerError::InvalidState(format!(\n913\t \"node {} is not in draining state (current: {:?}), use force=true to bypass\",\n914\t request.node_id, node_status\n915\t )));\n916\t }\n917\t\n918\t // Create operation record\n919\t let op_id = self.next_op_id.fetch_add(1, std::sync::atomic::Ordering::SeqCst);\n920\t\n921\t // Remove node from topology\n922\t {\n923\t let mut topo = self.topology.write().await;\n924\t topo.remove_node(&node_id);\n925\t }\n926\t\n927\t // Record operation\n928\t let operation = TopologyOperation {\n929\t id: op_id,\n930\t op_type: TopologyOperationType::RemoveNode,\n931\t status: TopologyOperationStatus::Complete,\n932\t target_node: Some(request.node_id.clone()),\n933\t target_group: None,\n934\t migrations: Vec::new(),\n935\t started_at: Some(now_ms()),\n936\t completed_at: Some(now_ms()),\n937\t error: None,\n938\t };\n939\t\n940\t {\n941\t let mut ops = self.operations.write().await;\n942\t ops.insert(op_id, operation);\n943\t }\n944\t\n945\t Ok(TopologyOperationResult {\n946\t id: op_id,\n947\t message: format!(\"Node {} removed from cluster\", request.node_id),\n948\t migrations_count: 0,\n949\t })\n950\t }\n951\t\n952\t /// Add a replica group.\n953\t pub async fn add_replica_group(\n954\t &self,\n955\t request: AddReplicaGroupRequest,\n956\t ) -> Result {\n957\t info!(group_id = request.group_id, node_count = request.nodes.len(), \"starting replica group addition\");\n958\t\n959\t // Check if group already exists\n960\t {\n961\t let topo = self.topology.read().await;\n962\t if topo.groups().any(|g| g.id == request.group_id) {\n963\t return Err(RebalancerError::InvalidState(format!(\n964\t \"replica group {} already exists\",\n965\t request.group_id\n966\t )));\n967\t }\n968\t }\n969\t\n970\t // Create operation record\n971\t let op_id = self.next_op_id.fetch_add(1, std::sync::atomic::Ordering::SeqCst);\n972\t\n973\t // Add nodes to topology\n974\t let node_ids: Vec = request.nodes.iter().map(|n| n.id.clone()).collect();\n975\t for node_spec in &request.nodes {\n976\t let mut topo = self.topology.write().await;\n977\t let node = Node::new(\n978\t TopologyNodeId::new(node_spec.id.clone()),\n979\t node_spec.address.clone(),\n980\t request.group_id,\n981\t );\n982\t topo.add_node(node);\n983\t }\n984\t\n985\t // For replica groups, we don't migrate data - the new group will sync from existing groups\n986\t // This is handled by the replication mechanism\n987\t\n988\t // Record operation\n989\t let operation = TopologyOperation {\n990\t id: op_id,\n991\t op_type: TopologyOperationType::AddReplicaGroup,\n992\t status: TopologyOperationStatus::Complete,\n993\t target_node: None,\n994\t target_group: Some(request.group_id),\n995\t migrations: Vec::new(),\n996\t started_at: Some(now_ms()),\n997\t completed_at: Some(now_ms()),\n998\t error: None,\n999\t };\n1000\t\n1001\t {\n1002\t let mut ops = self.operations.write().await;\n1003\t ops.insert(op_id, operation);\n1004\t }\n1005\t\n1006\t Ok(TopologyOperationResult {\n1007\t id: op_id,\n1008\t message: format!(\n1009\t \"Replica group {} added with {} nodes\",\n1010\t request.group_id,\n1011\t node_ids.len()\n1012\t ),\n1013\t migrations_count: 0,\n1014\t })\n1015\t }\n1016\t\n1017\t /// Remove a replica group.\n1018\t pub async fn remove_replica_group(\n1019\t &self,\n1020\t request: RemoveReplicaGroupRequest,\n1021\t ) -> Result {\n1022\t info!(group_id = request.group_id, force = request.force, \"starting replica group removal\");\n1023\t\n1024\t // Check if group exists and is empty\n1025\t {\n1026\t let topo = self.topology.read().await;\n1027\t let group = topo.groups().find(|g| g.id == request.group_id);\n1028\t\n1029\t let Some(grp) = group else {\n1030\t return Err(RebalancerError::GroupNotFound(request.group_id));\n1031\t };\n1032\t\n1033\t if !request.force && !grp.nodes().is_empty() {\n1034\t return Err(RebalancerError::GroupNotEmpty(request.group_id));\n1035\t }\n1036\t\n1037\t // Check if this is the last group\n1038\t if topo.groups().count() <= 1 {\n1039\t return Err(RebalancerError::InvalidState(\n1040\t \"cannot remove the last replica group\".into(),\n1041\t ));\n1042\t }\n1043\t }\n1044\t\n1045\t // Create operation record\n1046\t let op_id = self.next_op_id.fetch_add(1, std::sync::atomic::Ordering::SeqCst);\n1047\t\n1048\t // Remove group from topology (this removes all nodes in the group)\n1049\t {\n1050\t let mut topo = self.topology.write().await;\n1051\t topo.remove_group(request.group_id);\n1052\t }\n1053\t\n1054\t // Record operation\n1055\t let operation = TopologyOperation {\n1056\t id: op_id,\n1057\t op_type: TopologyOperationType::RemoveReplicaGroup,\n1058\t status: TopologyOperationStatus::Complete,\n1059\t target_node: None,\n1060\t target_group: Some(request.group_id),\n1061\t migrations: Vec::new(),\n1062\t started_at: Some(now_ms()),\n1063\t completed_at: Some(now_ms()),\n1064\t error: None,\n1065\t };\n1066\t\n1067\t {\n1068\t let mut ops = self.operations.write().await;\n1069\t ops.insert(op_id, operation);\n1070\t }\n1071\t\n1072\t Ok(TopologyOperationResult {\n1073\t id: op_id,\n1074\t message: format!(\"Replica group {} removed from cluster\", request.group_id),\n1075\t migrations_count: 0,\n1076\t })\n1077\t }\n1078\t\n1079\t /// Handle a node failure.\n1080\t pub async fn handle_node_failure(\n1081\t &self,\n1082\t node_id: &str,\n1083\t ) -> Result {\n1084\t warn!(node_id = %node_id, \"handling node failure\");\n1085\t\n1086\t let node_id_obj = TopologyNodeId::new(node_id.to_string());\n1087\t\n1088\t // Mark node as failed\n1089\t let replica_group = {\n1090\t let mut topo = self.topology.write().await;\n1091\t let node = topo.node_mut(&node_id_obj).ok_or_else(|| {\n1092\t RebalancerError::NodeNotFound(node_id.to_string())\n1093\t })?;\n1094\t\n1095\t node.status = NodeStatus::Failed;\n1096\t node.replica_group\n1097\t };\n1098\t\n1099\t // Create operation record\n1100\t let op_id = self.next_op_id.fetch_add(1, std::sync::atomic::Ordering::SeqCst);\n1101\t\n1102\t // TODO: Schedule background replication to restore RF if needed\n1103\t // For now, just record the failure\n1104\t\n1105\t let operation = TopologyOperation {\n1106\t id: op_id,\n1107\t op_type: TopologyOperationType::NodeFailure,\n1108\t status: TopologyOperationStatus::Complete,\n1109\t target_node: Some(node_id.to_string()),\n1110\t target_group: Some(replica_group),\n1111\t migrations: Vec::new(),\n1112\t started_at: Some(now_ms()),\n1113\t completed_at: Some(now_ms()),\n1114\t error: None,\n1115\t };\n1116\t\n1117\t {\n1118\t let mut ops = self.operations.write().await;\n1119\t ops.insert(op_id, operation);\n1120\t }\n1121\t\n1122\t Ok(TopologyOperationResult {\n1123\t id: op_id,\n1124\t message: format!(\"Node {} marked as failed\", node_id),\n1125\t migrations_count: 0,\n1126\t })\n1127\t }\n1128\t\n1129\t /// Compute which shards should move to a new node.\n1130\t /// Returns shard -> old_owner mapping for shards that will move.\n1131\t ///\n1132\t /// For each shard where the new node enters the assignment, we select one\n1133\t /// of the old owners as the migration source. If the new node displaced\n1134\t /// an old owner, we use that node; otherwise we use the lowest-scored old owner.\n1135\t async fn compute_shard_moves_for_new_node(\n1136\t &self,\n1137\t new_node_id: &str,\n1138\t replica_group: u32,\n1139\t ) -> Result, RebalancerError> {\n1140\t let topo = self.topology.read().await;\n1141\t\n1142\t let new_node_id = TopologyNodeId::new(new_node_id.to_string());\n1143\t let rf = topo.rf();\n1144\t\n1145\t // Find the target group\n1146\t let group = topo\n1147\t .groups()\n1148\t .find(|g| g.id == replica_group)\n1149\t .ok_or_else(|| RebalancerError::GroupNotFound(replica_group))?;\n1150\t\n1151\t let existing_nodes: Vec<_> = group.nodes().iter().cloned().collect();\n1152\t let mut affected_shards = Vec::new();\n1153\t\n1154\t // For each shard, check if the new node is in the new assignment\n1155\t for shard_id in 0..topo.shards {\n1156\t let old_assignment: Vec<_> = assign_shard_in_group(shard_id, &existing_nodes, rf)\n1157\t .into_iter()\n1158\t .collect();\n1159\t\n1160\t // New assignment with the new node included\n1161\t let all_nodes: Vec<_> = existing_nodes\n1162\t .iter()\n1163\t .cloned()\n1164\t .chain(std::iter::once(new_node_id.clone()))\n1165\t .collect();\n1166\t let new_assignment: Vec<_> = assign_shard_in_group(shard_id, &all_nodes, rf)\n1167\t .into_iter()\n1168\t .collect();\n1169\t\n1170\t // Check if new node is in the new assignment\n1171\t if !new_assignment.contains(&new_node_id) {\n1172\t continue;\n1173\t }\n1174\t\n1175\t // Find the source node for migration\n1176\t // Priority 1: Use the displaced node (if any)\n1177\t // Priority 2: Use the lowest-scored old owner (load balancing)\n1178\t let source_node = if let Some(displaced) = old_assignment.iter()\n1179\t .find(|n| !new_assignment.contains(n)) {\n1180\t // An old node was displaced - use it as source\n1181\t displaced.clone()\n1182\t } else {\n1183\t // No displacement - pick lowest-scored old owner\n1184\t // Find the old owner with the minimum rendezvous score\n1185\t let mut min_score = u64::MAX;\n1186\t let mut min_node = old_assignment.first().cloned()\n1187\t .unwrap_or_else(|| existing_nodes.first().unwrap().clone());\n1188\t\n1189\t for old_node in &old_assignment {\n1190\t let s = score(shard_id, old_node.as_str());\n1191\t if s < min_score {\n1192\t min_score = s;\n1193\t min_node = old_node.clone();\n1194\t }\n1195\t }\n1196\t min_node\n1197\t };\n1198\t\n1199\t affected_shards.push((ShardId(shard_id), source_node));\n1200\t }\n1201\t\n1202\t Ok(affected_shards)\n1203\t }\n1204\t\n1205\t /// Compute where each shard should go when draining a node.\n1206\t /// Returns shard -> destination_node mapping.\n1207\t async fn compute_shard_destinations_for_drain(\n1208\t &self,\n1209\t drain_node_id: &str,\n1210\t replica_group: u32,\n1211\t ) -> Result, RebalancerError> {\n1212\t let topo = self.topology.read().await;\n1213\t\n1214\t let drain_node_id = TopologyNodeId::new(drain_node_id.to_string());\n1215\t let rf = topo.rf();\n1216\t\n1217\t // Find the target group\n1218\t let group = topo\n1219\t .groups()\n1220\t .find(|g| g.id == replica_group)\n1221\t .ok_or_else(|| RebalancerError::GroupNotFound(replica_group))?;\n1222\t\n1223\t let other_nodes: Vec<_> = group\n1224\t .nodes()\n1225\t .iter()\n1226\t .filter(|n| **n != drain_node_id)\n1227\t .cloned()\n1228\t .collect();\n1229\t\n1230\t if other_nodes.is_empty() {\n1231\t return Err(RebalancerError::CannotRemoveLastNode);\n1232\t }\n1233\t\n1234\t let mut destinations = Vec::new();\n1235\t\n1236\t // For each shard, find a new owner among the remaining nodes\n1237\t for shard_id in 0..topo.shards {\n1238\t // Check if the draining node is in the assignment for this shard\n1239\t let assignment: Vec<_> = assign_shard_in_group(shard_id, group.nodes(), rf);\n1240\t\n1241\t if assignment.contains(&drain_node_id) {\n1242\t // This shard needs a new home\n1243\t // Use rendezvous hash to pick the best remaining node\n1244\t let mut best_node = None;\n1245\t let mut best_score = 0u64;\n1246\t\n1247\t for node in &other_nodes {\n1248\t let s = score(shard_id, node.as_str());\n1249\t if s > best_score {\n1250\t best_score = s;\n1251\t best_node = Some(node.clone());\n1252\t }\n1253\t }\n1254\t\n1255\t if let Some(dest) = best_node {\n1256\t destinations.push((ShardId(shard_id), dest));\n1257\t }\n1258\t }\n1259\t }\n1260\t\n1261\t Ok(destinations)\n1262\t }\n1263\t}\n1264\t\n1265\t/// Background task to run migrations for a topology operation.\n1266\tasync fn run_migration_task(\n1267\t topology: Arc>,\n1268\t coordinator: Arc>,\n1269\t operations: Arc>>,\n1270\t active_migrations: Arc>>,\n1271\t op_id: u64,\n1272\t migrations: Vec,\n1273\t config: RebalancerConfig,\n1274\t executor: Option>,\n1275\t metrics: Arc>,\n1276\t) -> Result<(), RebalancerError> {\n1277\t let Some(exec) = executor else {\n1278\t // No executor - simulate completion for testing\n1279\t for mid in migrations {\n1280\t tokio::time::sleep(tokio::time::Duration::from_millis(\n1281\t config.migration_batch_delay_ms,\n1282\t ))\n1283\t .await;\n1284\t\n1285\t let shards_to_complete = {\n1286\t let coord = coordinator.read().await;\n1287\t if let Some(state) = coord.get_state(mid) {\n1288\t state.old_owners.keys().copied().collect::>()\n1289\t } else {\n1290\t continue;\n1291\t }\n1292\t };\n1293\t\n1294\t let docs_per_shard = 1000u64;\n1295\t {\n1296\t let mut coord = coordinator.write().await;\n1297\t for shard in &shards_to_complete {\n1298\t coord.shard_migration_complete(mid, *shard, docs_per_shard)?;\n1299\t }\n1300\t }\n1301\t\n1302\t // Record metrics for simulated migration\n1303\t {\n1304\t let mut metrics_guard = metrics.write().await;\n1305\t metrics_guard.record_documents_migrated(docs_per_shard * shards_to_complete.len() as u64);\n1306\t }\n1307\t\n1308\t {\n1309\t let mut coord = coordinator.write().await;\n1310\t coord.begin_cutover(mid)?;\n1311\t coord.complete_drain(mid)?;\n1312\t coord.complete_cleanup(mid)?;\n1313\t }\n1314\t\n1315\t {\n1316\t let mut active = active_migrations.write().await;\n1317\t active.remove(&mid);\n1318\t }\n1319\t }\n1320\t\n1321\t // Mark operation as complete\n1322\t {\n1323\t let mut ops = operations.write().await;\n1324\t if let Some(op) = ops.get_mut(&op_id) {\n1325\t op.status = TopologyOperationStatus::Complete;\n1326\t op.completed_at = Some(now_ms());\n1327\t }\n1328\t }\n1329\t\n1330\t // Mark new node as active\n1331\t {\n1332\t let mut topo = topology.write().await;\n1333\t let ops = operations.read().await;\n1334\t if let Some(op) = ops.get(&op_id) {\n1335\t if let Some(ref node_id) = op.target_node {\n1336\t let node_id = TopologyNodeId::new(node_id.clone());\n1337\t if let Some(node) = topo.node_mut(&node_id) {\n1338\t node.status = NodeStatus::Active;\n1339\t }\n1340\t }\n1341\t }\n1342\t }\n1343\t\n1344\t return Ok(());\n1345\t };\n1346\t\n1347\t // With executor - perform actual migration\n1348\t // For each migration (each shard that moves to the new node)\n1349\t for mid in migrations {\n1350\t // Get migration state to find source/target info\n1351\t let (new_node, _replica_group, old_owners, index_uid) = {\n1352\t let coord = coordinator.read().await;\n1353\t let state = coord.get_state(mid).ok_or_else(|| {\n1354\t RebalancerError::InvalidState(\"migration state not found\".into())\n1355\t })?;\n1356\t\n1357\t // Use a default index for now - in production, this would come from config\n1358\t let index_uid = \"default\".to_string();\n1359\t\n1360\t (\n1361\t state.new_node.to_string(),\n1362\t state.replica_group,\n1363\t state.old_owners.clone(),\n1364\t index_uid,\n1365\t )\n1366\t };\n1367\t\n1368\t // Get node addresses\n1369\t let (new_node_address, old_owner_addresses) = {\n1370\t let topo = topology.read().await;\n1371\t let new_addr = topo.node(&TopologyNodeId::new(new_node.to_string()))\n1372\t .ok_or_else(|| RebalancerError::NodeNotFound(new_node.to_string()))?\n1373\t .address.clone();\n1374\t\n1375\t let mut old_addrs = HashMap::new();\n1376\t for (shard, old_node) in &old_owners {\n1377\t if let Some(node) = topo.node(&migration_to_topo_node_id(old_node)) {\n1378\t old_addrs.insert(*shard, node.address.clone());\n1379\t }\n1380\t }\n1381\t\n1382\t (new_addr, old_addrs)\n1383\t };\n1384\t\n1385\t let mut migration_total_docs = 0u64;\n1386\t\n1387\t // For each shard in the migration\n1388\t for (shard_id, old_node_id) in &old_owners {\n1389\t let old_address = old_owner_addresses.get(shard_id)\n1390\t .ok_or_else(|| RebalancerError::InvalidState(\"old node address not found\".into()))?;\n1391\t\n1392\t info!(\n1393\t migration_id = %mid,\n1394\t shard_id = shard_id.0,\n1395\t from = %old_node_id.0,\n1396\t to = %new_node,\n1397\t \"starting shard migration\"\n1398\t );\n1399\t\n1400\t // Paginate through all documents for this shard\n1401\t let mut offset = 0u32;\n1402\t let limit = config.migration_batch_size;\n1403\t let mut total_docs_copied = 0u64;\n1404\t\n1405\t loop {\n1406\t // Fetch documents from source\n1407\t let (docs, _total) = exec.fetch_documents(\n1408\t &old_node_id.0,\n1409\t old_address,\n1410\t &index_uid,\n1411\t shard_id.0,\n1412\t limit,\n1413\t offset,\n1414\t ).await.map_err(|e| {\n1415\t RebalancerError::InvalidState(format!(\"fetch failed: {}\", e))\n1416\t })?;\n1417\t\n1418\t if docs.is_empty() {\n1419\t break; // No more documents\n1420\t }\n1421\t\n1422\t // Write documents to target\n1423\t exec.write_documents(\n1424\t &new_node,\n1425\t &new_node_address,\n1426\t &index_uid,\n1427\t docs.clone(),\n1428\t ).await.map_err(|e| {\n1429\t RebalancerError::InvalidState(format!(\"write failed: {}\", e))\n1430\t })?;\n1431\t\n1432\t total_docs_copied += docs.len() as u64;\n1433\t offset += limit;\n1434\t\n1435\t // Throttle if configured\n1436\t if config.migration_batch_delay_ms > 0 {\n1437\t tokio::time::sleep(tokio::time::Duration::from_millis(\n1438\t config.migration_batch_delay_ms,\n1439\t ))\n1440\t .await;\n1441\t }\n1442\t }\n1443\t\n1444\t // Mark shard migration complete\n1445\t {\n1446\t let mut coord = coordinator.write().await;\n1447\t coord.shard_migration_complete(mid, *shard_id, total_docs_copied)?;\n1448\t }\n1449\t\n1450\t migration_total_docs += total_docs_copied;\n1451\t\n1452\t info!(\n1453\t migration_id = %mid,\n1454\t shard_id = shard_id.0,\n1455\t docs_copied = total_docs_copied,\n1456\t \"shard migration complete\"\n1457\t );\n1458\t }\n1459\t\n1460\t // Record metrics for this migration\n1461\t {\n1462\t let mut metrics_guard = metrics.write().await;\n1463\t metrics_guard.record_documents_migrated(migration_total_docs);\n1464\t }\n1465\t\n1466\t // All shards for this migration complete - begin cutover\n1467\t {\n1468\t let mut coord = coordinator.write().await;\n1469\t coord.begin_cutover(mid)?;\n1470\t }\n1471\t\n1472\t // Delta pass: re-read from source to catch stragglers\n1473\t for (shard_id, old_node_id) in &old_owners {\n1474\t let old_address = old_owner_addresses.get(shard_id).unwrap();\n1475\t\n1476\t let (docs, _) = exec.fetch_documents(\n1477\t &old_node_id.0,\n1478\t old_address,\n1479\t &index_uid,\n1480\t shard_id.0,\n1481\t config.migration_batch_size,\n1482\t 0,\n1483\t ).await.map_err(|e| {\n1484\t RebalancerError::InvalidState(format!(\"delta fetch failed: {}\", e))\n1485\t })?;\n1486\t\n1487\t if !docs.is_empty() {\n1488\t // Write any stragglers to target\n1489\t exec.write_documents(\n1490\t &new_node,\n1491\t &new_node_address,\n1492\t &index_uid,\n1493\t docs,\n1494\t ).await.map_err(|e| {\n1495\t RebalancerError::InvalidState(format!(\"delta write failed: {}\", e))\n1496\t })?;\n1497\t }\n1498\t\n1499\t // Mark delta complete\n1500\t {\n1501\t let mut coord = coordinator.write().await;\n1502\t // Complete drain after delta pass\n1503\t coord.complete_drain(mid)?;\n1504\t }\n1505\t }\n1506\t\n1507\t // Activate shards\n1508\t {\n1509\t let mut coord = coordinator.write().await;\n1510\t coord.complete_cleanup(mid)?;\n1511\t }\n1512\t\n1513\t // Delete migrated shards from old nodes\n1514\t for (shard_id, old_node_id) in &old_owners {\n1515\t let old_address = old_owner_addresses.get(shard_id).unwrap();\n1516\t\n1517\t if let Err(e) = exec.delete_shard(\n1518\t &old_node_id.0,\n1519\t old_address,\n1520\t &index_uid,\n1521\t shard_id.0,\n1522\t ).await {\n1523\t warn!(\n1524\t shard_id = shard_id.0,\n1525\t node = %old_node_id.0,\n1526\t error = %e,\n1527\t \"failed to delete migrated shard from old node (may need manual cleanup)\"\n1528\t );\n1529\t }\n1530\t }\n1531\t\n1532\t // Remove from active migrations\n1533\t {\n1534\t let mut active = active_migrations.write().await;\n1535\t active.remove(&mid);\n1536\t }\n1537\t }\n1538\t\n1539\t // Mark operation as complete\n1540\t {\n1541\t let mut ops = operations.write().await;\n1542\t if let Some(op) = ops.get_mut(&op_id) {\n1543\t op.status = TopologyOperationStatus::Complete;\n1544\t op.completed_at = Some(now_ms());\n1545\t }\n1546\t }\n1547\t\n1548\t // Mark new node as active\n1549\t {\n1550\t let mut topo = topology.write().await;\n1551\t let ops = operations.read().await;\n1552\t if let Some(op) = ops.get(&op_id) {\n1553\t if let Some(ref node_id) = op.target_node {\n1554\t let node_id = TopologyNodeId::new(node_id.clone());\n1555\t if let Some(node) = topo.node_mut(&node_id) {\n1556\t node.status = NodeStatus::Active;\n1557\t }\n1558\t }\n1559\t }\n1560\t }\n1561\t\n1562\t Ok(())\n1563\t}\n1564\t\n1565\t/// Background task to run drain migrations for a node.\n1566\tasync fn run_drain_task(\n1567\t topology: Arc>,\n1568\t coordinator: Arc>,\n1569\t operations: Arc>>,\n1570\t active_migrations: Arc>>,\n1571\t op_id: u64,\n1572\t migrations: Vec,\n1573\t config: RebalancerConfig,\n1574\t drain_node_id: String,\n1575\t executor: Option>,\n1576\t metrics: Arc>,\n1577\t) -> Result<(), RebalancerError> {\n1578\t let Some(exec) = executor else {\n1579\t // No executor - simulate completion for testing\n1580\t for mid in migrations {\n1581\t tokio::time::sleep(tokio::time::Duration::from_millis(\n1582\t config.migration_batch_delay_ms,\n1583\t ))\n1584\t .await;\n1585\t\n1586\t let shards_to_complete = {\n1587\t let coord = coordinator.read().await;\n1588\t if let Some(state) = coord.get_state(mid) {\n1589\t state.old_owners.keys().copied().collect::>()\n1590\t } else {\n1591\t continue;\n1592\t }\n1593\t };\n1594\t\n1595\t let docs_per_shard = 1000u64;\n1596\t {\n1597\t let mut coord = coordinator.write().await;\n1598\t for shard in &shards_to_complete {\n1599\t coord.shard_migration_complete(mid, *shard, docs_per_shard)?;\n1600\t }\n1601\t }\n1602\t\n1603\t // Record metrics for simulated migration\n1604\t {\n1605\t let mut metrics_guard = metrics.write().await;\n1606\t metrics_guard.record_documents_migrated(docs_per_shard * shards_to_complete.len() as u64);\n1607\t }\n1608\t\n1609\t {\n1610\t let mut coord = coordinator.write().await;\n1611\t coord.begin_cutover(mid)?;\n1612\t coord.complete_drain(mid)?;\n1613\t coord.complete_cleanup(mid)?;\n1614\t }\n1615\t\n1616\t {\n1617\t let mut active = active_migrations.write().await;\n1618\t active.remove(&mid);\n1619\t }\n1620\t }\n1621\t\n1622\t // Mark operation as complete\n1623\t {\n1624\t let mut ops = operations.write().await;\n1625\t if let Some(op) = ops.get_mut(&op_id) {\n1626\t op.status = TopologyOperationStatus::Complete;\n1627\t op.completed_at = Some(now_ms());\n1628\t }\n1629\t }\n1630\t\n1631\t // Mark drained node as removed (operator can delete PVC)\n1632\t {\n1633\t let mut topo = topology.write().await;\n1634\t let node_id = TopologyNodeId::new(drain_node_id);\n1635\t if let Some(node) = topo.node_mut(&node_id) {\n1636\t node.status = NodeStatus::Removed;\n1637\t }\n1638\t }\n1639\t\n1640\t return Ok(());\n1641\t };\n1642\t\n1643\t // With executor - perform actual drain migration\n1644\t // For each migration (each shard being drained from the node)\n1645\t for mid in migrations {\n1646\t // Get migration state\n1647\t let (new_node, _replica_group, old_owners, index_uid) = {\n1648\t let coord = coordinator.read().await;\n1649\t let state = coord.get_state(mid).ok_or_else(|| {\n1650\t RebalancerError::InvalidState(\"migration state not found\".into())\n1651\t })?;\n1652\t\n1653\t // Use a default index for now\n1654\t let index_uid = \"default\".to_string();\n1655\t\n1656\t (\n1657\t state.new_node.to_string(),\n1658\t state.replica_group,\n1659\t state.old_owners.clone(),\n1660\t index_uid,\n1661\t )\n1662\t };\n1663\t\n1664\t // Get node addresses\n1665\t let (_drain_node_id_obj, drain_node_address, new_node_address) = {\n1666\t let topo = topology.read().await;\n1667\t let drain_id = TopologyNodeId::new(drain_node_id.clone());\n1668\t let drain_addr = topo.node(&drain_id)\n1669\t .ok_or_else(|| RebalancerError::NodeNotFound(drain_node_id.clone()))?\n1670\t .address.clone();\n1671\t\n1672\t let new_addr = topo.node(&TopologyNodeId::new(new_node.to_string()))\n1673\t .ok_or_else(|| RebalancerError::NodeNotFound(new_node.to_string()))?\n1674\t .address.clone();\n1675\t\n1676\t (drain_id, drain_addr, new_addr)\n1677\t };\n1678\t\n1679\t // For each shard being drained\n1680\t for (shard_id, _old_node) in &old_owners {\n1681\t info!(\n1682\t migration_id = %mid,\n1683\t shard_id = shard_id.0,\n1684\t from = %drain_node_id,\n1685\t to = %new_node,\n1686\t \"starting shard drain\"\n1687\t );\n1688\t\n1689\t // Paginate through all documents for this shard on the draining node\n1690\t let mut offset = 0u32;\n1691\t let limit = config.migration_batch_size;\n1692\t let mut total_docs_copied = 0u64;\n1693\t\n1694\t loop {\n1695\t // Fetch documents from draining node\n1696\t let (docs, _total) = exec.fetch_documents(\n1697\t &drain_node_id,\n1698\t &drain_node_address,\n1699\t &index_uid,\n1700\t shard_id.0,\n1701\t limit,\n1702\t offset,\n1703\t ).await.map_err(|e| {\n1704\t RebalancerError::InvalidState(format!(\"fetch failed: {}\", e))\n1705\t })?;\n1706\t\n1707\t if docs.is_empty() {\n1708\t break; // No more documents\n1709\t }\n1710\t\n1711\t // Write documents to new node\n1712\t exec.write_documents(\n1713\t &new_node,\n1714\t &new_node_address,\n1715\t &index_uid,\n1716\t docs.clone(),\n1717\t ).await.map_err(|e| {\n1718\t RebalancerError::InvalidState(format!(\"write failed: {}\", e))\n1719\t })?;\n1720\t\n1721\t total_docs_copied += docs.len() as u64;\n1722\t offset += limit;\n1723\t\n1724\t if config.migration_batch_delay_ms > 0 {\n1725\t tokio::time::sleep(tokio::time::Duration::from_millis(\n1726\t config.migration_batch_delay_ms,\n1727\t ))\n1728\t .await;\n1729\t }\n1730\t }\n1731\t\n1732\t // Mark shard migration complete\n1733\t {\n1734\t let mut coord = coordinator.write().await;\n1735\t coord.shard_migration_complete(mid, *shard_id, total_docs_copied)?;\n1736\t }\n1737\t\n1738\t info!(\n1739\t migration_id = %mid,\n1740\t shard_id = shard_id.0,\n1741\t docs_copied = total_docs_copied,\n1742\t \"shard drain complete\"\n1743\t );\n1744\t }\n1745\t\n1746\t // All shards for this migration complete - begin cutover\n1747\t {\n1748\t let mut coord = coordinator.write().await;\n1749\t coord.begin_cutover(mid)?;\n1750\t }\n1751\t\n1752\t // Delta pass: re-read from draining node to catch stragglers\n1753\t for (shard_id, _old_node) in &old_owners {\n1754\t let (docs, _) = exec.fetch_documents(\n1755\t &drain_node_id,\n1756\t &drain_node_address,\n1757\t &index_uid,\n1758\t shard_id.0,\n1759\t config.migration_batch_size,\n1760\t 0,\n1761\t ).await.map_err(|e| {\n1762\t RebalancerError::InvalidState(format!(\"delta fetch failed: {}\", e))\n1763\t })?;\n1764\t\n1765\t if !docs.is_empty() {\n1766\t // Write any stragglers to new node\n1767\t exec.write_documents(\n1768\t &new_node,\n1769\t &new_node_address,\n1770\t &index_uid,\n1771\t docs,\n1772\t ).await.map_err(|e| {\n1773\t RebalancerError::InvalidState(format!(\"delta write failed: {}\", e))\n1774\t })?;\n1775\t }\n1776\t\n1777\t {\n1778\t let mut coord = coordinator.write().await;\n1779\t coord.complete_drain(mid)?;\n1780\t }\n1781\t }\n1782\t\n1783\t // Activate shards and complete cleanup\n1784\t {\n1785\t let mut coord = coordinator.write().await;\n1786\t coord.complete_cleanup(mid)?;\n1787\t }\n1788\t\n1789\t // Delete drained shards from the draining node\n1790\t for (shard_id, _old_node) in &old_owners {\n1791\t if let Err(e) = exec.delete_shard(\n1792\t &drain_node_id,\n1793\t &drain_node_address,\n1794\t &index_uid,\n1795\t shard_id.0,\n1796\t ).await {\n1797\t warn!(\n1798\t shard_id = shard_id.0,\n1799\t node = %drain_node_id,\n1800\t error = %e,\n1801\t \"failed to delete drained shard (may need manual cleanup)\"\n1802\t );\n1803\t }\n1804\t }\n1805\t\n1806\t {\n1807\t let mut active = active_migrations.write().await;\n1808\t active.remove(&mid);\n1809\t }\n1810\t }\n1811\t\n1812\t // Mark operation as complete\n1813\t {\n1814\t let mut ops = operations.write().await;\n1815\t if let Some(op) = ops.get_mut(&op_id) {\n1816\t op.status = TopologyOperationStatus::Complete;\n1817\t op.completed_at = Some(now_ms());\n1818\t }\n1819\t }\n1820\t\n1821\t // Mark drained node as removed (operator can delete PVC)\n1822\t {\n1823\t let mut topo = topology.write().await;\n1824\t let node_id = TopologyNodeId::new(drain_node_id);\n1825\t if let Some(node) = topo.node_mut(&node_id) {\n1826\t node.status = NodeStatus::Removed;\n1827\t }\n1828\t }\n1829\t\n1830\t Ok(())\n1831\t}\n1832\t\n1833\t/// Get current time in milliseconds since Unix epoch.\n1834\tfn now_ms() -> u64 {\n1835\t std::time::SystemTime::now()\n1836\t .duration_since(std::time::UNIX_EPOCH)\n1837\t .unwrap_or_default()\n1838\t .as_millis() as u64\n1839\t}\n1840\t\n1841\t// ---------------------------------------------------------------------------\n1842\t// HttpMigrationExecutor - Actual HTTP-based document migration\n1843\t// ---------------------------------------------------------------------------\n1844\t\n1845\t/// HTTP-based migration executor for moving documents between Meilisearch nodes.\n1846\t///\n1847\t/// This implements the `MigrationExecutor` trait by making actual HTTP requests\n1848\t/// to Meilisearch nodes' APIs. It uses the `_miroir_shard` filterable attribute\n1849\t/// to fetch only the documents belonging to a specific shard.\n1850\tpub struct HttpMigrationExecutor {\n1851\t /// Master key for authenticating with Meilisearch nodes.\n1852\t node_master_key: String,\n1853\t /// HTTP client for making requests to nodes.\n1854\t client: reqwest::Client,\n1855\t}\n1856\t\n1857\timpl HttpMigrationExecutor {\n1858\t /// Create a new HTTP migration executor.\n1859\t ///\n1860\t /// # Arguments\n1861\t /// * `node_master_key` - Master key for authenticating with Meilisearch nodes\n1862\t /// * `node_timeout_ms` - Timeout for HTTP requests to nodes (milliseconds)\n1863\t pub fn new(node_master_key: String, node_timeout_ms: u64) -> Self {\n1864\t let timeout = std::time::Duration::from_millis(node_timeout_ms);\n1865\t\n1866\t let client = reqwest::Client::builder()\n1867\t .timeout(timeout)\n1868\t .build()\n1869\t .expect(\"Failed to create HTTP client for migration executor\");\n1870\t\n1871\t Self {\n1872\t node_master_key,\n1873\t client,\n1874\t }\n1875\t }\n1876\t\n1877\t /// Build the filter string for fetching documents by shard.\n1878\t fn shard_filter(&self, shard_id: u32) -> String {\n1879\t format!(\"_miroir_shard = {}\", shard_id)\n1880\t }\n1881\t\n1882\t /// Make an authenticated GET request to a node.\n1883\t async fn get_node(\n1884\t &self,\n1885\t node_address: &str,\n1886\t path: &str,\n1887\t ) -> std::result::Result {\n1888\t let url = if node_address.ends_with('/') {\n1889\t format!(\"{}{}\", node_address, path.trim_start_matches('/'))\n1890\t } else {\n1891\t format!(\"{}/{}\", node_address.trim_end_matches('/'), path.trim_start_matches('/'))\n1892\t };\n1893\t\n1894\t self.client\n1895\t .get(&url)\n1896\t .header(\"Authorization\", format!(\"Bearer {}\", self.node_master_key))\n1897\t .send()\n1898\t .await\n1899\t .map_err(|e| format!(\"GET {} failed: {}\", url, e))\n1900\t }\n1901\t\n1902\t /// Make an authenticated POST request to a node.\n1903\t async fn post_node(\n1904\t &self,\n1905\t node_address: &str,\n1906\t path: &str,\n1907\t body: serde_json::Value,\n1908\t ) -> std::result::Result {\n1909\t let url = if node_address.ends_with('/') {\n1910\t format!(\"{}{}\", node_address, path.trim_start_matches('/'))\n1911\t } else {\n1912\t format!(\"{}/{}\", node_address.trim_end_matches('/'), path.trim_start_matches('/'))\n1913\t };\n1914\t\n1915\t self.client\n1916\t .post(&url)\n1917\t .header(\"Authorization\", format!(\"Bearer {}\", self.node_master_key))\n1918\t .json(&body)\n1919\t .send()\n1920\t .await\n1921\t .map_err(|e| format!(\"POST {} failed: {}\", url, e))\n1922\t }\n1923\t}\n1924\t\n1925\t#[async_trait::async_trait]\n1926\timpl MigrationExecutor for HttpMigrationExecutor {\n1927\t /// Fetch documents from a source node for a specific shard.\n1928\t ///\n1929\t /// Uses the `_miroir_shard` filterable attribute to retrieve only documents\n1930\t /// belonging to the specified shard, avoiding full index scans.\n1931\t async fn fetch_documents(\n1932\t &self,\n1933\t _source_node: &str,\n1934\t source_address: &str,\n1935\t index_uid: &str,\n1936\t shard_id: u32,\n1937\t limit: u32,\n1938\t offset: u32,\n1939\t ) -> std::result::Result<(Vec, u64), String> {\n1940\t let filter = self.shard_filter(shard_id);\n1941\t let path = format!(\n1942\t \"indexes/{}/documents?filter={}&limit={}&offset={}\",\n1943\t index_uid,\n1944\t urlencoding::encode(&filter),\n1945\t limit,\n1946\t offset\n1947\t );\n1948\t\n1949\t let response = self.get_node(source_address, &path).await?;\n1950\t\n1951\t if !response.status().is_success() {\n1952\t let status = response.status();\n1953\t let error_text = response.text().await.unwrap_or_else(|_| \"unable to read error\".to_string());\n1954\t return Err(format!(\n1955\t \"Failed to fetch documents from {}: HTTP {} - {}\",\n1956\t source_address, status, error_text\n1957\t ));\n1958\t }\n1959\t\n1960\t let json_body: serde_json::Value = response\n1961\t .json()\n1962\t .await\n1963\t .map_err(|e| format!(\"Failed to parse response from {}: {}\", source_address, e))?;\n1964\t\n1965\t // Meilisearch returns { results: [...], total: 123, limit: 20, offset: 0 }\n1966\t let results = json_body\n1967\t .get(\"results\")\n1968\t .and_then(|v| v.as_array())\n1969\t .ok_or_else(|| format!(\"Invalid response from {}: missing 'results' field\", source_address))?;\n1970\t\n1971\t let total = json_body\n1972\t .get(\"total\")\n1973\t .and_then(|v| v.as_u64())\n1974\t .unwrap_or(0);\n1975\t\n1976\t Ok((results.clone(), total))\n1977\t }\n1978\t\n1979\t /// Write documents to a target node.\n1980\t ///\n1981\t /// Documents already contain the `_miroir_shard` field from the source,\n1982\t /// so they can be written directly without modification.\n1983\t async fn write_documents(\n1984\t &self,\n1985\t _target_node: &str,\n1986\t target_address: &str,\n1987\t index_uid: &str,\n1988\t documents: Vec,\n1989\t ) -> std::result::Result<(), String> {\n1990\t if documents.is_empty() {\n1991\t return Ok(());\n1992\t }\n1993\t\n1994\t let path = format!(\"indexes/{}/documents\", index_uid);\n1995\t\n1996\t let response = self.post_node(target_address, &path, serde_json::json!(documents)).await?;\n1997\t\n1998\t if !response.status().is_success() {\n1999\t let status = response.status();\n2000\t let error_text = response.text().await.unwrap_or_else(|_| \"unable to read error\".to_string());\n2001\t return Err(format!(\n2002\t \"Failed to write {} documents to {}: HTTP {} - {}\",\n2003\t documents.len(),\n2004\t target_address,\n2005\t status,\n2006\t error_text\n2007\t ));\n2008\t }\n2009\t\n2010\t // The response contains the task UID, but we don't need to wait for it\n2011\t // since migrations are eventually consistent via anti-entropy\n2012\t Ok(())\n2013\t }\n2014\t\n2015\t /// Delete documents from a node by shard filter.\n2016\t ///\n2017\t /// This is called after a shard migration is complete to remove the\n2018\t /// migrated documents from the source node.\n2019\t async fn delete_shard(\n2020\t &self,\n2021\t _node: &str,\n2022\t node_address: &str,\n2023\t index_uid: &str,\n2024\t shard_id: u32,\n2025\t ) -> std::result::Result<(), String> {\n2026\t let filter = self.shard_filter(shard_id);\n2027\t let path = format!(\"indexes/{}/documents/delete\", index_uid);\n2028\t\n2029\t let body = serde_json::json!({\n2030\t \"filter\": filter\n2031\t });\n2032\t\n2033\t let response = self.post_node(node_address, &path, body).await?;\n2034\t\n2035\t if !response.status().is_success() {\n2036\t let status = response.status();\n2037\t let error_text = response.text().await.unwrap_or_else(|_| \"unable to read error\".to_string());\n2038\t return Err(format!(\n2039\t \"Failed to delete shard {} from {}: HTTP {} - {}\",\n2040\t shard_id, node_address, status, error_text\n2041\t ));\n2042\t }\n2043\t\n2044\t Ok(())\n2045\t }\n2046\t}\n2047\t\n2048\t#[cfg(test)]\n2049\tmod tests {\n2050\t use super::*;\n2051\t use crate::migration::MigrationConfig;\n2052\t use crate::topology::Node;\n2053\t use std::sync::Arc;\n2054\t\n2055\t fn test_topology() -> Topology {\n2056\t let mut topo = Topology::new(64, 2, 2);\n2057\t topo.add_node(Node::new(TopologyNodeId::new(\"node-0\".into()), \"http://node-0:7700\".into(), 0));\n2058\t topo.add_node(Node::new(TopologyNodeId::new(\"node-1\".into()), \"http://node-1:7700\".into(), 0));\n2059\t topo.add_node(Node::new(TopologyNodeId::new(\"node-2\".into()), \"http://node-2:7700\".into(), 1));\n2060\t topo.add_node(Node::new(TopologyNodeId::new(\"node-3\".into()), \"http://node-3:7700\".into(), 1));\n2061\t topo\n2062\t }\n2063\t\n2064\t #[test]\n2065\t fn test_rebalancer_config_default() {\n2066\t let config = RebalancerConfig::default();\n2067\t assert_eq!(config.max_concurrent_migrations, 4);\n2068\t assert_eq!(config.migration_timeout_s, 3600);\n2069\t assert!(config.auto_rebalance_on_recovery);\n2070\t }\n2071\t\n2072\t #[test]\n2073\t fn test_topology_operation_serialization() {\n2074\t let op = TopologyOperation {\n2075\t id: 1,\n2076\t op_type: TopologyOperationType::AddNode,\n2077\t status: TopologyOperationStatus::InProgress,\n2078\t target_node: Some(\"node-4\".into()),\n2079\t target_group: Some(0),\n2080\t migrations: vec![MigrationId(1), MigrationId(2)],\n2081\t started_at: Some(1700000000000),\n2082\t completed_at: None,\n2083\t error: None,\n2084\t };\n2085\t\n2086\t let json = serde_json::to_string(&op).unwrap();\n2087\t assert!(json.contains(\"\\\"op_type\\\":\\\"add_node\\\"\"));\n2088\t assert!(json.contains(\"\\\"status\\\":\\\"in_progress\\\"\"));\n2089\t assert!(json.contains(\"\\\"target_node\\\":\\\"node-4\\\"\"));\n2090\t }\n2091\t\n2092\t #[test]\n2093\t fn test_rebalance_status_serialization() {\n2094\t let status = RebalanceStatus {\n2095\t in_progress: true,\n2096\t operations: vec![],\n2097\t migrations: HashMap::new(),\n2098\t };\n2099\t\n2100\t let json = serde_json::to_string(&status).unwrap();\n2101\t assert!(json.contains(\"\\\"in_progress\\\":true\"));\n2102\t }\n2103\t\n2104\t #[tokio::test]\n2105\t async fn test_rebalancer_status() {\n2106\t let topo = Arc::new(RwLock::new(test_topology()));\n2107\t let config = RebalancerConfig::default();\n2108\t let migration_config = MigrationConfig::default();\n2109\t\n2110\t let rebalancer = Rebalancer::new(config, topo, migration_config);\n2111\t\n2112\t let status = rebalancer.status().await;\n2113\t assert!(!status.in_progress);\n2114\t assert!(status.operations.is_empty());\n2115\t }\n2116\t\n2117\t #[tokio::test]\n2118\t async fn test_add_node_creates_operation() {\n2119\t let topo = Arc::new(RwLock::new(test_topology()));\n2120\t let config = RebalancerConfig::default();\n2121\t let migration_config = MigrationConfig::default();\n2122\t\n2123\t let rebalancer = Rebalancer::new(config, topo.clone(), migration_config);\n2124\t\n2125\t let request = AddNodeRequest {\n2126\t id: \"node-4\".into(),\n2127\t address: \"http://node-4:7700\".into(),\n2128\t replica_group: 0,\n2129\t };\n2130\t\n2131\t let result = rebalancer.add_node(request).await.unwrap();\n2132\t assert!(result.id > 0);\n2133\t assert!(result.migrations_count > 0);\n2134\t\n2135\t // Check node was added\n2136\t let topo_read = topo.read().await;\n2137\t assert!(topo_read.node(&TopologyNodeId::new(\"node-4\".into())).is_some());\n2138\t }\n2139\t\n2140\t #[tokio::test]\n2141\t async fn test_add_duplicate_node_fails() {\n2142\t let topo = Arc::new(RwLock::new(test_topology()));\n2143\t let config = RebalancerConfig::default();\n2144\t let migration_config = MigrationConfig::default();\n2145\t\n2146\t let rebalancer = Rebalancer::new(config, topo, migration_config);\n2147\t\n2148\t let request = AddNodeRequest {\n2149\t id: \"node-0\".into(), // Already exists\n2150\t address: \"http://node-0:7700\".into(),\n2151\t replica_group: 0,\n2152\t };\n2153\t\n2154\t let result = rebalancer.add_node(request).await;\n2155\t assert!(result.is_err());\n2156\t }\n2157\t\n2158\t #[tokio::test]\n2159\t async fn test_remove_last_node_fails() {\n2160\t let mut topo = Topology::new(64, 1, 1);\n2161\t topo.add_node(Node::new(\n2162\t TopologyNodeId::new(\"solo\".into()),\n2163\t \"http://solo:7700\".into(),\n2164\t 0,\n2165\t ));\n2166\t let topo = Arc::new(RwLock::new(topo));\n2167\t\n2168\t let config = RebalancerConfig::default();\n2169\t let migration_config = MigrationConfig::default();\n2170\t\n2171\t let rebalancer = Rebalancer::new(config, topo, migration_config);\n2172\t\n2173\t let request = RemoveNodeRequest {\n2174\t node_id: \"solo\".into(),\n2175\t force: false,\n2176\t };\n2177\t\n2178\t let result = rebalancer.remove_node(request).await;\n2179\t assert!(matches!(result, Err(RebalancerError::CannotRemoveLastNode)));\n2180\t }\n2181\t\n2182\t #[tokio::test]\n2183\t async fn test_handle_node_failure() {\n2184\t let topo = Arc::new(RwLock::new(test_topology()));\n2185\t let config = RebalancerConfig::default();\n2186\t let migration_config = MigrationConfig::default();\n2187\t\n2188\t let rebalancer = Rebalancer::new(config, topo.clone(), migration_config);\n2189\t\n2190\t let result = rebalancer.handle_node_failure(\"node-0\").await.unwrap();\n2191\t assert!(matches!(\n2192\t result.message.as_str(),\n2193\t \"Node node-0 marked as failed\"\n2194\t ));\n2195\t\n2196\t // Check node was marked failed\n2197\t let topo_read = topo.read().await;\n2198\t let node = topo_read.node(&TopologyNodeId::new(\"node-0\".into())).unwrap();\n2199\t assert_eq!(node.status, NodeStatus::Failed);\n2200\t }\n2201\t\n2202\t #[test]\n2203\t fn test_shard_filter() {\n2204\t let executor = HttpMigrationExecutor::new(\"test-key\".to_string(), 5000);\n2205\t assert_eq!(executor.shard_filter(42), \"_miroir_shard = 42\");\n2206\t assert_eq!(executor.shard_filter(0), \"_miroir_shard = 0\");\n2207\t }\n2208\t\n2209\t #[test]\n2210\t fn test_http_migration_executor_new() {\n2211\t let executor = HttpMigrationExecutor::new(\"master-key\".to_string(), 10000);\n2212\t assert_eq!(executor.node_master_key, \"master-key\");\n2213\t }\n2214\t}\n2215\t"}]},"parent_tool_use_id":"call_0f9d635724804b359279800d","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"6371db99-c372-4046-9bf0-168e5cc7e8a8","timestamp":"2026-05-23T06:37:03.585Z"} +{"type":"system","subtype":"task_progress","task_id":"a044869e1855cdfaf","tool_use_id":"call_0f9d635724804b359279800d","description":"Searching for tokio::spawn|task::spawn","usage":{"total_tokens":0,"tool_uses":12,"duration_ms":15650},"last_tool_name":"Grep","uuid":"ec1f1f50-7479-44bd-865b-41239a1094ae","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39"} 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Rendezvous hash-based routing and shard assignment.\n2\t\n3\tuse crate::migration::{MigrationCoordinator, ShardId};\n4\tuse crate::topology::{Group, NodeId, Topology};\n5\tuse std::collections::HashSet;\n6\tuse std::hash::{Hash, Hasher};\n7\tuse twox_hash::XxHash64;\n8\t\n9\t/// Compute a rendezvous score for a shard+node pair.\n10\t///\n11\t/// Higher scores win; used for deterministic shard assignment.\n12\tpub fn score(shard_id: u32, node_id: &str) -> u64 {\n13\t let mut h = XxHash64::with_seed(0);\n14\t shard_id.hash(&mut h);\n15\t node_id.hash(&mut h);\n16\t h.finish()\n17\t}\n18\t\n19\t/// Assign a shard to `rf` nodes within a single replica group.\n20\t///\n21\t/// `group_nodes` is the subset of nodes belonging to that group.\n22\t///\n23\t/// Sorts by score descending, breaking ties lexicographically on node_id\n24\t/// for deterministic resolution.\n25\tpub fn assign_shard_in_group(shard_id: u32, group_nodes: &[NodeId], rf: usize) -> Vec {\n26\t let mut scored: Vec<(u64, &NodeId)> = group_nodes\n27\t .iter()\n28\t .map(|n| (score(shard_id, n.as_str()), n))\n29\t .collect();\n30\t scored.sort_unstable_by(|a, b| {\n31\t b.0.cmp(&a.0)\n32\t .then_with(|| a.1.as_str().cmp(b.1.as_str()))\n33\t });\n34\t scored\n35\t .into_iter()\n36\t .take(rf)\n37\t .map(|(_, n)| n.clone())\n38\t .collect()\n39\t}\n40\t\n41\t/// All write targets for a document: the RF nodes in EACH replica group.\n42\tpub fn write_targets(shard_id: u32, topology: &Topology) -> Vec {\n43\t topology\n44\t .groups()\n45\t .flat_map(|group| assign_shard_in_group(shard_id, group.nodes(), topology.rf()))\n46\t .collect()\n47\t}\n48\t\n49\t/// All write targets for a document, considering dual-write state during migration.\n50\t///\n51\t/// This is the migration-aware version of `write_targets`. When a shard is in\n52\t/// dual-write phase (node addition in progress), it includes both the old owner\n53\t/// AND the new node in the target list to ensure no writes are lost during migration.\n54\t///\n55\t/// # Arguments\n56\t/// * `shard_id` - The shard ID being written to\n57\t/// * `topology` - The cluster topology\n58\t/// * `migration_coordinator` - Optional migration coordinator for dual-write detection\n59\t///\n60\t/// # Returns\n61\t/// A vector of node IDs that should receive the write. During dual-write for a shard,\n62\t/// this includes both the standard RF nodes AND the new node.\n63\tpub fn write_targets_with_migration(\n64\t shard_id: u32,\n65\t topology: &Topology,\n66\t migration_coordinator: Option<&MigrationCoordinator>,\n67\t) -> Vec {\n68\t let shard = ShardId(shard_id);\n69\t\n70\t // Start with standard write targets\n71\t let mut targets: Vec = write_targets(shard_id, topology);\n72\t\n73\t // Check if this shard is in dual-write phase\n74\t if let Some(coordinator) = migration_coordinator {\n75\t if coordinator.is_dual_write_active(shard) {\n76\t // Find migrations affecting this shard\n77\t for (_mid, state) in coordinator.get_all_migrations() {\n78\t if state.affected_shards.contains_key(&shard) {\n79\t // This shard is being migrated - include the new node\n80\t // Convert migration NodeId to topology NodeId\n81\t let new_node_id = crate::topology::NodeId::new(state.new_node.0.clone());\n82\t\n83\t // Only add if not already in targets\n84\t if !targets.contains(&new_node_id) {\n85\t targets.push(new_node_id);\n86\t }\n87\t }\n88\t }\n89\t }\n90\t }\n91\t\n92\t targets\n93\t}\n94\t\n95\t/// Select the replica group for a query (round-robin by query counter).\n96\t///\n97\t/// Returns 0 when there are no replica groups (caller handles the empty case).\n98\tpub fn query_group(query_seq: u64, replica_groups: u32) -> u32 {\n99\t if replica_groups == 0 {\n100\t return 0;\n101\t }\n102\t (query_seq % replica_groups as u64) as u32\n103\t}\n104\t\n105\t/// The covering set for a search: one node per shard within the chosen group.\n106\tpub fn covering_set(shard_count: u32, group: &Group, rf: usize, query_seq: u64) -> Vec {\n107\t (0..shard_count)\n108\t .map(|shard_id| {\n109\t let replicas = assign_shard_in_group(shard_id, group.nodes(), rf);\n110\t // rotate through replicas for intra-group load balancing\n111\t replicas[(query_seq as usize) % replicas.len()].clone()\n112\t })\n113\t .collect::>()\n114\t .into_iter()\n115\t .collect()\n116\t}\n117\t\n118\t/// Covering set with settings version floor filtering (plan §13.5).\n119\t///\n120\t/// Excludes nodes whose settings version for the given index is below `floor`.\n121\t/// Returns None if no covering set can be assembled (caller should return 503).\n122\tpub fn covering_set_with_version_floor(\n123\t shard_count: u32,\n124\t group: &Group,\n125\t rf: usize,\n126\t query_seq: u64,\n127\t index: &str,\n128\t floor: u64,\n129\t version_checker: &impl Fn(&str, &str) -> u64,\n130\t) -> Option> {\n131\t let mut result = Vec::new();\n132\t let mut used_nodes = HashSet::new();\n133\t\n134\t for shard_id in 0..shard_count {\n135\t let replicas = assign_shard_in_group(shard_id, group.nodes(), rf);\n136\t\n137\t // Filter replicas by settings version floor, then by query_seq rotation\n138\t let eligible: Vec<_> = replicas\n139\t .iter()\n140\t .filter(|node_id| {\n141\t let version = version_checker(index, node_id.as_str());\n142\t version >= floor\n143\t })\n144\t .collect();\n145\t\n146\t if eligible.is_empty() {\n147\t // No eligible replica for this shard\n148\t return None;\n149\t }\n150\t\n151\t // Rotate through eligible replicas using query_seq\n152\t let selected = eligible[query_seq as usize % eligible.len()];\n153\t if used_nodes.insert(selected.clone()) {\n154\t result.push(selected.clone());\n155\t }\n156\t }\n157\t\n158\t Some(result)\n159\t}\n160\t\n161\t/// Compute the shard ID for a document's primary key.\n162\tpub fn shard_for_key(primary_key: &str, shard_count: u32) -> u32 {\n163\t let mut h = XxHash64::with_seed(0);\n164\t primary_key.hash(&mut h);\n165\t (h.finish() % shard_count as u64) as u32\n166\t}\n167\t\n168\t/// Count differences between two shard assignments.\n169\t///\n170\t/// Returns the number of shard-node pairs that differ between old and new.\n171\t/// For each shard, counts nodes in new assignment that weren't in old.\n172\tpub fn count_assignment_diff(\n173\t old_shards: &[(u32, Vec)],\n174\t new_shards: &[(u32, Vec)],\n175\t) -> usize {\n176\t let old_map: std::collections::HashMap<_, _> = old_shards\n177\t .iter()\n178\t .map(|(shard, nodes)| (*shard, nodes.clone()))\n179\t .collect();\n180\t\n181\t let mut diff = 0;\n182\t for (shard, new_nodes) in new_shards {\n183\t if let Some(old_nodes) = old_map.get(shard) {\n184\t // Count nodes in new that weren't in old (counts each change once)\n185\t for node in new_nodes {\n186\t if !old_nodes.contains(node) {\n187\t diff += 1;\n188\t }\n189\t }\n190\t }\n191\t }\n192\t diff\n193\t}\n194\t\n195\t#[cfg(test)]\n196\tmod tests {\n197\t use super::*;\n198\t use crate::topology::{Node, NodeId};\n199\t use std::collections::HashMap;\n200\t\n201\t /// Test 1: Determinism — same inputs always produce the same output.\n202\t #[test]\n203\t fn test_determinism() {\n204\t let nodes = vec![\n205\t NodeId::new(\"node-a\".to_string()),\n206\t NodeId::new(\"node-b\".to_string()),\n207\t NodeId::new(\"node-c\".to_string()),\n208\t ];\n209\t\n210\t let reference = (0..100)\n211\t .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes, 2)))\n212\t .collect::>();\n213\t\n214\t // Run 1000 times and compare to reference\n215\t for _ in 0..1000 {\n216\t let current = (0..100)\n217\t .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes, 2)))\n218\t .collect::>();\n219\t\n220\t assert_eq!(reference, current, \"Assignment is non-deterministic\");\n221\t }\n222\t }\n223\t\n224\t /// Test 2: Reshuffle bound on add — 64 shards, 3→4 nodes.\n225\t ///\n226\t /// Expected: at most 2 × (1/4) × 64 = 32 shard-node edges differ.\n227\t #[test]\n228\t fn test_reshuffle_bound_on_add() {\n229\t let shard_count = 64;\n230\t let rf = 2;\n231\t\n232\t let nodes_3 = vec![\n233\t NodeId::new(\"node-a\".to_string()),\n234\t NodeId::new(\"node-b\".to_string()),\n235\t NodeId::new(\"node-c\".to_string()),\n236\t ];\n237\t\n238\t let mut nodes_4 = nodes_3.clone();\n239\t nodes_4.push(NodeId::new(\"node-d\".to_string()));\n240\t\n241\t let old_assignment: Vec<_> = (0..shard_count)\n242\t .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes_3, rf)))\n243\t .collect();\n244\t\n245\t let new_assignment: Vec<_> = (0..shard_count)\n246\t .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes_4, rf)))\n247\t .collect();\n248\t\n249\t let diff = count_assignment_diff(&old_assignment, &new_assignment);\n250\t let max_diff = 2 * (shard_count as f64 / 4.0).ceil() as usize;\n251\t\n252\t assert!(\n253\t diff <= max_diff,\n254\t \"Add reshuffle exceeded bound: {} > {}\",\n255\t diff,\n256\t max_diff\n257\t );\n258\t }\n259\t\n260\t /// Test 3: Reshuffle bound on remove — 64 shards, 4→3 nodes.\n261\t ///\n262\t /// Expected: ~RF × S / Ng edges differ.\n263\t #[test]\n264\t fn test_reshuffle_bound_on_remove() {\n265\t let shard_count = 64;\n266\t let rf = 2;\n267\t\n268\t let nodes_4 = vec![\n269\t NodeId::new(\"node-a\".to_string()),\n270\t NodeId::new(\"node-b\".to_string()),\n271\t NodeId::new(\"node-c\".to_string()),\n272\t NodeId::new(\"node-d\".to_string()),\n273\t ];\n274\t\n275\t let nodes_3 = vec![\n276\t NodeId::new(\"node-a\".to_string()),\n277\t NodeId::new(\"node-b\".to_string()),\n278\t NodeId::new(\"node-c\".to_string()),\n279\t ];\n280\t\n281\t let old_assignment: Vec<_> = (0..shard_count)\n282\t .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes_4, rf)))\n283\t .collect();\n284\t\n285\t let new_assignment: Vec<_> = (0..shard_count)\n286\t .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes_3, rf)))\n287\t .collect();\n288\t\n289\t let diff = count_assignment_diff(&old_assignment, &new_assignment);\n290\t // Expected ~RF × S / Ng = 2 × 64 / 4 = 32\n291\t let expected_diff = (rf * shard_count as usize) / 4;\n292\t\n293\t assert!(\n294\t (diff as isize - expected_diff as isize).abs() <= expected_diff as isize / 2,\n295\t \"Remove reshuffle deviated significantly from expected: {} vs ~{}\",\n296\t diff,\n297\t expected_diff\n298\t );\n299\t }\n300\t\n301\t /// Test 4: Uniformity — 64 shards, 3 nodes, RF=1.\n302\t ///\n303\t /// Expected: each node holds approximately equal shards (18–26 per plan §8 DoD).\n304\t #[test]\n305\t fn test_uniformity() {\n306\t let shard_count = 64;\n307\t let rf = 1;\n308\t\n309\t let nodes = vec![\n310\t NodeId::new(\"node-a\".to_string()),\n311\t NodeId::new(\"node-b\".to_string()),\n312\t NodeId::new(\"node-c\".to_string()),\n313\t ];\n314\t\n315\t let mut shard_counts: HashMap = HashMap::new();\n316\t for node in &nodes {\n317\t shard_counts.insert(node.clone(), 0);\n318\t }\n319\t\n320\t for shard_id in 0..shard_count {\n321\t let assigned = assign_shard_in_group(shard_id, &nodes, rf);\n322\t for node in assigned {\n323\t *shard_counts.entry(node).or_insert(0) += 1;\n324\t }\n325\t }\n326\t\n327\t // Expected per node: 64/3 ≈ 21.3\n328\t // Verified range: 17–26 (XxHash64 with 64 shards / 3 nodes)\n329\t for (node, count) in shard_counts {\n330\t assert!(\n331\t (17..=26).contains(&count),\n332\t \"Node {} has {} shards, expected 17–26\",\n333\t node.as_str(),\n334\t count\n335\t );\n336\t }\n337\t }\n338\t\n339\t /// Test 5: RF=2 placement — minimal change on add/remove.\n340\t #[test]\n341\t fn test_rf2_placement_stability() {\n342\t let shard_count = 64;\n343\t let rf = 2;\n344\t\n345\t let nodes_3 = vec![\n346\t NodeId::new(\"node-a\".to_string()),\n347\t NodeId::new(\"node-b\".to_string()),\n348\t NodeId::new(\"node-c\".to_string()),\n349\t ];\n350\t\n351\t let mut nodes_4 = nodes_3.clone();\n352\t nodes_4.push(NodeId::new(\"node-d\".to_string()));\n353\t\n354\t let old_assignment: Vec<_> = (0..shard_count)\n355\t .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes_3, rf)))\n356\t .collect();\n357\t\n358\t let new_assignment: Vec<_> = (0..shard_count)\n359\t .map(|shard_id| (shard_id, assign_shard_in_group(shard_id, &nodes_4, rf)))\n360\t .collect();\n361\t\n362\t let diff = count_assignment_diff(&old_assignment, &new_assignment);\n363\t\n364\t // For RF=2, adding a node should affect at most 2 × (1/4) × 64 = 32 edges\n365\t let max_diff = 2 * (shard_count as f64 / 4.0).ceil() as usize;\n366\t\n367\t assert!(\n368\t diff <= max_diff,\n369\t \"RF=2 placement changed too much on add: {} > {}\",\n370\t diff,\n371\t max_diff\n372\t );\n373\t }\n374\t\n375\t /// Test 6: shard_for_key matches known fixture.\n376\t #[test]\n377\t fn test_shard_for_key_fixture() {\n378\t // Known test vectors computed with: XxHash64::with_seed(0).hash(pk) % shard_count\n379\t let fixtures: Vec<(&str, u32, u32)> = vec![\n380\t (\"user:123\", 64, 46),\n381\t (\"user:456\", 64, 48),\n382\t (\"product:abc\", 64, 24),\n383\t (\"order:xyz\", 64, 10),\n384\t (\"alpha\", 128, 104),\n385\t (\"beta\", 128, 91),\n386\t ];\n387\t\n388\t for (key, shard_count, expected) in fixtures {\n389\t let actual = shard_for_key(key, shard_count);\n390\t assert_eq!(\n391\t actual, expected,\n392\t \"shard_for_key({:?}, {}) = {}, expected {}\",\n393\t key, shard_count, actual, expected\n394\t );\n395\t }\n396\t }\n397\t\n398\t /// Test tie-breaking in assign_shard_in_group.\n399\t #[test]\n400\t fn test_tie_breaking() {\n401\t // Use node IDs that are unlikely but could theoretically collide\n402\t let nodes = vec![\n403\t NodeId::new(\"node-zzz\".to_string()),\n404\t NodeId::new(\"node-aaa\".to_string()),\n405\t ];\n406\t\n407\t let result = assign_shard_in_group(0, &nodes, 1);\n408\t\n409\t // Even if scores were identical (extremely rare), node-aaa should come first\n410\t // because we sort by node_id ascending for ties\n411\t assert_eq!(result.len(), 1);\n412\t // The actual result depends on hash values - we're just verifying determinism\n413\t let result2 = assign_shard_in_group(0, &nodes, 1);\n414\t assert_eq!(result, result2, \"Tie-breaking is non-deterministic\");\n415\t }\n416\t\n417\t /// Test score function uses canonical hash order.\n418\t #[test]\n419\t fn test_score_canonical_order() {\n420\t let node_a = \"node-a\";\n421\t let node_b = \"node-b\";\n422\t\n423\t // Different shard_id → different score\n424\t let score_0_a = score(0, node_a);\n425\t let score_1_a = score(1, node_a);\n426\t assert_ne!(score_0_a, score_1_a, \"Same node, different shard should differ\");\n427\t\n428\t // Different node_id → different score (same shard)\n429\t let score_0_b = score(0, node_b);\n430\t assert_ne!(score_0_a, score_0_b, \"Same shard, different node should differ\");\n431\t\n432\t // Verify determinism\n433\t assert_eq!(score(0, node_a), score_0_a, \"Score is non-deterministic\");\n434\t }\n435\t\n436\t // ── P1.3 acceptance tests: write_targets, query_group, covering_set ───\n437\t\n438\t /// P1.3-A1: write_targets returns exactly RG × RF nodes (counting duplicates).\n439\t #[test]\n440\t fn test_write_targets_returns_rg_x_rf_nodes() {\n441\t let mut topo = Topology::new(64, 3, 2);\n442\t // Add 5 nodes to each of 3 groups\n443\t for i in 0u32..15 {\n444\t let rg = i / 5;\n445\t topo.add_node(Node::new(\n446\t NodeId::new(format!(\"node-{i}\")),\n447\t format!(\"http://node-{i}:7700\"),\n448\t rg,\n449\t ));\n450\t }\n451\t\n452\t let targets = write_targets(0, &topo);\n453\t // RG=3, RF=2 → 6 nodes total (may include duplicates)\n454\t assert_eq!(targets.len(), 6, \"write_targets should return RG × RF nodes\");\n455\t }\n456\t\n457\t /// P1.3-A2: write_targets assigns one-per-group.\n458\t #[test]\n459\t fn test_write_targets_one_per_group() {\n460\t let mut topo = Topology::new(64, 2, 2);\n461\t // Group 0: nodes 0-2, Group 1: nodes 3-5\n462\t for i in 0u32..6 {\n463\t let rg = if i < 3 { 0 } else { 1 };\n464\t topo.add_node(Node::new(\n465\t NodeId::new(format!(\"node-{i}\")),\n466\t format!(\"http://node-{i}:7700\"),\n467\t rg,\n468\t ));\n469\t }\n470\t\n471\t let shard_id = 7;\n472\t let targets = write_targets(shard_id, &topo);\n473\t\n474\t // Verify that the subset in group 0 matches assign_shard_in_group\n475\t let g0 = topo.group(0).unwrap();\n476\t let g0_targets: Vec<_> = targets\n477\t .iter()\n478\t .filter(|n| g0.nodes().contains(n))\n479\t .collect();\n480\t let g0_expected = assign_shard_in_group(shard_id, g0.nodes(), 2);\n481\t assert_eq!(\n482\t g0_targets.len(),\n483\t g0_expected.len(),\n484\t \"Group 0 should have exactly RF nodes\"\n485\t );\n486\t for node in &g0_expected {\n487\t assert!(g0_targets.contains(&node), \"Group 0 missing expected node\");\n488\t }\n489\t\n490\t // Verify that the subset in group 1 matches assign_shard_in_group\n491\t let g1 = topo.group(1).unwrap();\n492\t let g1_targets: Vec<_> = targets\n493\t .iter()\n494\t .filter(|n| g1.nodes().contains(n))\n495\t .collect();\n496\t let g1_expected = assign_shard_in_group(shard_id, g1.nodes(), 2);\n497\t assert_eq!(\n498\t g1_targets.len(),\n499\t g1_expected.len(),\n500\t \"Group 1 should have exactly RF nodes\"\n501\t );\n502\t for node in &g1_expected {\n503\t assert!(g1_targets.contains(&node), \"Group 1 missing expected node\");\n504\t }\n505\t }\n506\t\n507\t /// P1.3-A3: covering_set covers all shards within the chosen group.\n508\t #[test]\n509\t fn test_covering_set_covers_all_shards() {\n510\t let mut topo = Topology::new(16, 1, 2);\n511\t for i in 0u32..4 {\n512\t topo.add_node(Node::new(\n513\t NodeId::new(format!(\"node-{i}\")),\n514\t format!(\"http://node-{i}:7700\"),\n515\t 0,\n516\t ));\n517\t }\n518\t\n519\t let group = topo.group(0).unwrap();\n520\t let shard_count = 16;\n521\t let covering = covering_set(shard_count, group, 2, 0);\n522\t\n523\t // Verify that every shard is represented in the covering set\n524\t for shard_id in 0..shard_count {\n525\t let replicas = assign_shard_in_group(shard_id, group.nodes(), 2);\n526\t let selected = &replicas[0]; // query_seq=0 → first replica\n527\t assert!(\n528\t covering.contains(selected),\n529\t \"Shard {}'s selected node {:?} not in covering set\",\n530\t shard_id,\n531\t selected\n532\t );\n533\t }\n534\t }\n535\t\n536\t /// P1.3-A4: covering_set size is bounded by Ng (nodes in group).\n537\t #[test]\n538\t fn test_covering_set_size_bound() {\n539\t let mut topo = Topology::new(1000, 1, 3);\n540\t for i in 0u32..5 {\n541\t topo.add_node(Node::new(\n542\t NodeId::new(format!(\"node-{i}\")),\n543\t format!(\"http://node-{i}:7700\"),\n544\t 0,\n545\t ));\n546\t }\n547\t\n548\t let group = topo.group(0).unwrap();\n549\t let ng = group.node_count();\n550\t let covering = covering_set(1000, group, 3, 0);\n551\t\n552\t assert!(\n553\t covering.len() <= ng,\n554\t \"covering_set size {} exceeds group node count {}\",\n555\t covering.len(),\n556\t ng\n557\t );\n558\t }\n559\t\n560\t /// P1.3-A5: Two identical Topologies produce identical covering_set outputs.\n561\t #[test]\n562\t fn test_covering_set_determinism() {\n563\t let mut topo1 = Topology::new(64, 2, 2);\n564\t let mut topo2 = Topology::new(64, 2, 2);\n565\t\n566\t for i in 0u32..6 {\n567\t let rg = if i < 3 { 0 } else { 1 };\n568\t let node = Node::new(\n569\t NodeId::new(format!(\"node-{i}\")),\n570\t format!(\"http://node-{i}:7700\"),\n571\t rg,\n572\t );\n573\t topo1.add_node(node.clone());\n574\t topo2.add_node(node);\n575\t }\n576\t\n577\t let g1 = topo1.group(0).unwrap();\n578\t let g2 = topo2.group(0).unwrap();\n579\t\n580\t for query_seq in 0..10 {\n581\t let c1 = covering_set(64, g1, 2, query_seq);\n582\t let c2 = covering_set(64, g2, 2, query_seq);\n583\t // Compare as sets since order may vary due to HashSet iteration\n584\t let s1: std::collections::HashSet<_> = c1.into_iter().collect();\n585\t let s2: std::collections::HashSet<_> = c2.into_iter().collect();\n586\t assert_eq!(\n587\t s1, s2,\n588\t \"covering_set differs for identical topologies at query_seq={}\",\n589\t query_seq\n590\t );\n591\t }\n592\t }\n593\t\n594\t /// P1.3-A6: query_group distribution is uniform (chi-square test).\n595\t #[test]\n596\t fn test_query_group_uniform_distribution() {\n597\t let replica_groups = 5u32;\n598\t let samples = 10_000;\n599\t\n600\t let mut counts = vec![0usize; replica_groups as usize];\n601\t for query_seq in 0..samples {\n602\t let g = query_group(query_seq as u64, replica_groups);\n603\t counts[g as usize] += 1;\n604\t }\n605\t\n606\t // Expected count per group: samples / RG\n607\t let expected = samples as f64 / replica_groups as f64;\n608\t\n609\t // Chi-square statistic: sum((observed - expected)^2 / expected)\n610\t let chi_square: f64 = counts\n611\t .iter()\n612\t .map(|&observed| {\n613\t let diff = observed as f64 - expected;\n614\t (diff * diff) / expected\n615\t })\n616\t .sum();\n617\t\n618\t // Degrees of freedom = RG - 1 = 4\n619\t // Critical value at p=0.95 is ~9.49\n620\t let critical_value = 9.49;\n621\t\n622\t assert!(\n623\t chi_square < critical_value,\n624\t \"query_group distribution not uniform: chi-square={} > {}\",\n625\t chi_square,\n626\t critical_value\n627\t );\n628\t }\n629\t\n630\t /// P1.3-A7: covering_set rotates replicas by query_seq.\n631\t #[test]\n632\t fn test_covering_set_rotates_replicas() {\n633\t let mut topo = Topology::new(8, 1, 3);\n634\t for i in 0u32..4 {\n635\t topo.add_node(Node::new(\n636\t NodeId::new(format!(\"node-{i}\")),\n637\t format!(\"http://node-{i}:7700\"),\n638\t 0,\n639\t ));\n640\t }\n641\t\n642\t let group = topo.group(0).unwrap();\n643\t let c0 = covering_set(8, group, 3, 0);\n644\t let c1 = covering_set(8, group, 3, 1);\n645\t let c2 = covering_set(8, group, 3, 2);\n646\t\n647\t // For each shard, verify that the selected node rotates\n648\t for shard_id in 0..8 {\n649\t let replicas = assign_shard_in_group(shard_id, group.nodes(), 3);\n650\t let r0 = &replicas[0];\n651\t let r1 = &replicas[1];\n652\t let r2 = &replicas[2];\n653\t\n654\t assert!(c0.contains(r0), \"query_seq=0 should select first replica\");\n655\t assert!(c1.contains(r1), \"query_seq=1 should select second replica\");\n656\t assert!(c2.contains(r2), \"query_seq=2 should select third replica\");\n657\t }\n658\t }\n659\t}\n660\t"}]},"parent_tool_use_id":"call_0f9d635724804b359279800d","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"64262a9f-28cf-4509-8760-c95b10cfce96","timestamp":"2026-05-23T06:37:11.371Z"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_6d1a7fa014f843e8bac763ac","type":"tool_result","content":"Found 31 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+{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_5c56ed4bdbe04cfeb898e0c3","type":"tool_result","content":"1\t//! Shard migration cutover state machine.\n2\t//!\n3\t//! Implements the node-addition migration flow from plan §4 with explicit state\n4\t//! transitions and a race-window-safe cutover sequence.\n5\t//!\n6\t//! ## Race window analysis (plan §15 OP#1)\n7\t//!\n8\t//! The dangerous window is between \"mark node active\" (routing changes to new-node-only)\n9\t//! and \"delete migrated shard from old node.\" A document written during dual-write that\n10\t//! succeeded on OLD but failed on NEW — and arrived after the last migration page —\n11\t//! would be deleted from OLD without ever reaching NEW.\n12\t//!\n13\t//! ## Solution: quiesce-then-verify cutover\n14\t//!\n15\t//! Instead of the naïve sequence (mark active → stop dual-write → delete old), we use:\n16\t//!\n17\t//! 1. Stop dual-write (no new writes go to either node for affected shards)\n18\t//! 2. Drain: wait for all in-flight writes to both OLD and NEW to complete\n19\t//! 3. Delta migration: re-read affected shards from OLD (catches anything written since\n20\t//! the last migration page) and write deltas to NEW\n21\t//! 4. Mark node active (routing switches to NEW-only)\n22\t//! 5. Delete migrated shard from OLD\n23\t//!\n24\t//! Step 3 is the key: it closes the race window by ensuring NEW has a complete picture\n25\t//! before we commit the routing change. The cost is one extra pagination pass over each\n26\t//! migrated shard — bounded by the number of docs written during the migration window.\n27\t\n28\tuse std::collections::{HashMap, HashSet};\n29\tuse std::fmt;\n30\tuse std::time::{Duration, Instant};\n31\t\n32\tuse serde::{Deserialize, Serialize};\n33\t\n34\t/// Unique identifier for a shard migration operation.\n35\t#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]\n36\tpub struct MigrationId(pub u64);\n37\t\n38\timpl fmt::Display for MigrationId {\n39\t fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {\n40\t write!(f, \"{}\", self.0)\n41\t }\n42\t}\n43\t\n44\t/// Identifier for a physical node in the cluster.\n45\t#[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]\n46\tpub struct NodeId(pub String);\n47\t\n48\t// Type alias for external use (rebalancer, etc.)\n49\tpub type MigrationNodeId = NodeId;\n50\t\n51\timpl fmt::Display for NodeId {\n52\t fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {\n53\t write!(f, \"{}\", self.0)\n54\t }\n55\t}\n56\t\n57\t/// Identifier for a logical shard.\n58\t#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]\n59\tpub struct ShardId(pub u32);\n60\t\n61\timpl fmt::Display for ShardId {\n62\t fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {\n63\t write!(f, \"s{}\", self.0)\n64\t }\n65\t}\n66\t\n67\t/// Per-shard migration state within a node-addition migration.\n68\t#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]\n69\tpub enum ShardMigrationState {\n70\t /// Waiting for background migration to begin.\n71\t Pending,\n72\t /// Background pagination is reading docs from source and writing to target.\n73\t Migrating {\n74\t docs_copied: u64,\n75\t pages_remaining: u32,\n76\t },\n77\t /// Background migration complete, awaiting cutover.\n78\t MigrationComplete { docs_copied: u64 },\n79\t /// Dual-write stopped, in-flight writes draining.\n80\t Draining {\n81\t in_flight_count: u32,\n82\t docs_copied: u64,\n83\t },\n84\t /// Delta pass: re-reading source to catch stragglers written during migration.\n85\t DeltaPass {\n86\t docs_copied: u64,\n87\t delta_docs_copied: u64,\n88\t },\n89\t /// Node is active for this shard; old replica data deleted.\n90\t Active,\n91\t /// Migration failed at this phase.\n92\t Failed { phase: String, reason: String },\n93\t}\n94\t\n95\timpl fmt::Display for ShardMigrationState {\n96\t fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {\n97\t match self {\n98\t Self::Pending => write!(f, \"pending\"),\n99\t Self::Migrating {\n100\t docs_copied,\n101\t pages_remaining,\n102\t } => {\n103\t write!(\n104\t f,\n105\t \"migrating({docs_copied} copied, {pages_remaining} pages left)\"\n106\t )\n107\t }\n108\t Self::MigrationComplete { docs_copied } => {\n109\t write!(f, \"migration_complete({docs_copied} copied)\")\n110\t }\n111\t Self::Draining {\n112\t in_flight_count,\n113\t docs_copied,\n114\t } => {\n115\t write!(\n116\t f,\n117\t \"draining({in_flight_count} in-flight, {docs_copied} copied)\"\n118\t )\n119\t }\n120\t Self::DeltaPass {\n121\t docs_copied,\n122\t delta_docs_copied,\n123\t } => {\n124\t write!(f, \"delta_pass({docs_copied} + {delta_docs_copied} copied)\")\n125\t }\n126\t Self::Active => write!(f, \"active\"),\n127\t Self::Failed { phase, reason } => write!(f, \"failed({phase}: {reason})\"),\n128\t }\n129\t }\n130\t}\n131\t\n132\t/// Overall migration phase for a node addition.\n133\t#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]\n134\tpub enum MigrationPhase {\n135\t /// Computing which shards move to the new node.\n136\t ComputingAssignments,\n137\t /// Dual-write active; background migration in progress.\n138\t DualWriteMigrating,\n139\t /// Background migration done; beginning cutover.\n140\t CutoverBegin,\n141\t /// Stopping dual-write; waiting for in-flight writes to settle.\n142\t CutoverDraining,\n143\t /// Re-reading source to catch docs written during migration.\n144\t CutoverDeltaPass,\n145\t /// Marking new node active; switching routing.\n146\t CutoverActivate,\n147\t /// Deleting migrated shard data from old nodes.\n148\t CutoverCleanup,\n149\t /// All shards migrated; migration complete.\n150\t Complete,\n151\t /// Migration failed.\n152\t Failed(String),\n153\t}\n154\t\n155\timpl fmt::Display for MigrationPhase {\n156\t fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {\n157\t match self {\n158\t Self::ComputingAssignments => write!(f, \"computing_assignments\"),\n159\t Self::DualWriteMigrating => write!(f, \"dual_write_migrating\"),\n160\t Self::CutoverBegin => write!(f, \"cutover_begin\"),\n161\t Self::CutoverDraining => write!(f, \"cutover_draining\"),\n162\t Self::CutoverDeltaPass => write!(f, \"cutover_delta_pass\"),\n163\t Self::CutoverActivate => write!(f, \"cutover_activate\"),\n164\t Self::CutoverCleanup => write!(f, \"cutover_cleanup\"),\n165\t Self::Complete => write!(f, \"complete\"),\n166\t Self::Failed(msg) => write!(f, \"failed({msg})\"),\n167\t }\n168\t }\n169\t}\n170\t\n171\t/// A single document write targeting a shard during migration.\n172\t#[derive(Debug, Clone)]\n173\tpub struct InFlightWrite {\n174\t pub doc_id: String,\n175\t pub shard: ShardId,\n176\t pub target_nodes: Vec,\n177\t pub completed_nodes: HashSet,\n178\t pub failed_nodes: HashMap,\n179\t pub submitted_at: Instant,\n180\t}\n181\t\n182\t// Serialize Instant as a placeholder bool (present/absent).\n183\t// Instant is monotonic and not meaningfully serializable across processes;\n184\t// on deserialize, reconstruct as Instant::now().\n185\tmod instant_serde {\n186\t use serde::{Deserialize, Deserializer, Serialize, Serializer};\n187\t use std::time::Instant;\n188\t\n189\t pub fn serialize(instant: &Option, serializer: S) -> Result\n190\t where\n191\t S: Serializer,\n192\t {\n193\t instant.is_some().serialize(serializer)\n194\t }\n195\t\n196\t pub fn deserialize<'de, D>(deserializer: D) -> Result, D::Error>\n197\t where\n198\t D: Deserializer<'de>,\n199\t {\n200\t let present = bool::deserialize(deserializer)?;\n201\t Ok(if present { Some(Instant::now()) } else { None })\n202\t }\n203\t}\n204\t\n205\t/// Configuration for migration cutover behavior.\n206\t#[derive(Debug, Clone, Serialize, Deserialize)]\n207\tpub struct MigrationConfig {\n208\t /// Maximum time to wait for in-flight writes to drain during cutover.\n209\t pub drain_timeout: Duration,\n210\t /// Whether to perform the delta pass (re-read source after stopping dual-write).\n211\t /// Disabling this saves a pagination pass but opens the race window — only safe\n212\t /// when anti-entropy is enabled as a safety net.\n213\t pub skip_delta_pass: bool,\n214\t /// Whether anti-entropy is enabled — used to determine if skip_delta_pass is safe.\n215\t pub anti_entropy_enabled: bool,\n216\t}\n217\t\n218\timpl Default for MigrationConfig {\n219\t fn default() -> Self {\n220\t Self {\n221\t drain_timeout: Duration::from_secs(30),\n222\t skip_delta_pass: false,\n223\t anti_entropy_enabled: true,\n224\t }\n225\t }\n226\t}\n227\t\n228\t/// Error type for migration operations.\n229\t#[derive(Debug, thiserror::Error)]\n230\tpub enum MigrationError {\n231\t #[error(\n232\t \"anti-entropy is disabled and delta pass is skipped — documents may be lost at cutover\"\n233\t )]\n234\t UnsafeCutoverNoAntiEntropy,\n235\t #[error(\"drain timeout exceeded: {0} in-flight writes still pending\")]\n236\t DrainTimeout(u32),\n237\t #[error(\"shard {0} is not in a valid state for this transition (current: {1})\")]\n238\t InvalidTransition(ShardId, String),\n239\t #[error(\"migration {0} not found\")]\n240\t NotFound(MigrationId),\n241\t #[error(\"delta pass failed for shard {0}: {1}\")]\n242\t DeltaPassFailed(ShardId, String),\n243\t}\n244\t\n245\t/// Tracks the state of a node-addition migration.\n246\t#[derive(Debug, Clone, Serialize, Deserialize)]\n247\tpub struct MigrationState {\n248\t pub id: MigrationId,\n249\t pub new_node: NodeId,\n250\t pub replica_group: u32,\n251\t pub phase: MigrationPhase,\n252\t pub affected_shards: HashMap,\n253\t /// Maps shard → old node that currently owns it.\n254\t pub old_owners: HashMap,\n255\t #[serde(with = \"instant_serde\")]\n256\t pub started_at: Option,\n257\t #[serde(with = \"instant_serde\")]\n258\t pub completed_at: Option,\n259\t}\n260\t\n261\t/// The migration coordinator manages shard migration state transitions.\n262\tpub struct MigrationCoordinator {\n263\t config: MigrationConfig,\n264\t migrations: HashMap,\n265\t next_id: u64,\n266\t /// In-flight writes being tracked for drain during cutover.\n267\t in_flight: Vec,\n268\t}\n269\t\n270\timpl MigrationCoordinator {\n271\t pub fn new(config: MigrationConfig) -> Self {\n272\t Self {\n273\t config,\n274\t migrations: HashMap::new(),\n275\t next_id: 0,\n276\t in_flight: Vec::new(),\n277\t }\n278\t }\n279\t\n280\t /// Validate migration safety before starting. Returns an error if the configuration\n281\t /// would allow data loss at the cutover boundary.\n282\t pub fn validate_safety(&self) -> Result<(), MigrationError> {\n283\t if self.config.skip_delta_pass && !self.config.anti_entropy_enabled {\n284\t return Err(MigrationError::UnsafeCutoverNoAntiEntropy);\n285\t }\n286\t Ok(())\n287\t }\n288\t\n289\t /// Begin a new node-addition migration.\n290\t pub fn begin_migration(\n291\t &mut self,\n292\t new_node: NodeId,\n293\t replica_group: u32,\n294\t affected_shards: HashMap,\n295\t ) -> Result {\n296\t self.validate_safety()?;\n297\t\n298\t let id = MigrationId(self.next_id);\n299\t self.next_id += 1;\n300\t\n301\t let shard_states: HashMap = affected_shards\n302\t .keys()\n303\t .map(|&shard| (shard, ShardMigrationState::Pending))\n304\t .collect();\n305\t\n306\t let state = MigrationState {\n307\t id,\n308\t new_node,\n309\t replica_group,\n310\t phase: MigrationPhase::ComputingAssignments,\n311\t affected_shards: shard_states,\n312\t old_owners: affected_shards,\n313\t started_at: Some(Instant::now()),\n314\t completed_at: None,\n315\t };\n316\t\n317\t self.migrations.insert(id, state);\n318\t Ok(id)\n319\t }\n320\t\n321\t /// Transition to dual-write + background migration phase.\n322\t pub fn begin_dual_write(&mut self, id: MigrationId) -> Result<(), MigrationError> {\n323\t let state = self\n324\t .migrations\n325\t .get_mut(&id)\n326\t .ok_or(MigrationError::NotFound(id))?;\n327\t state.phase = MigrationPhase::DualWriteMigrating;\n328\t for shard_state in state.affected_shards.values_mut() {\n329\t if *shard_state == ShardMigrationState::Pending {\n330\t *shard_state = ShardMigrationState::Migrating {\n331\t docs_copied: 0,\n332\t pages_remaining: 0,\n333\t };\n334\t }\n335\t }\n336\t Ok(())\n337\t }\n338\t\n339\t /// Record that a shard's background migration completed.\n340\t pub fn shard_migration_complete(\n341\t &mut self,\n342\t id: MigrationId,\n343\t shard: ShardId,\n344\t docs_copied: u64,\n345\t ) -> Result<(), MigrationError> {\n346\t let state = self\n347\t .migrations\n348\t .get_mut(&id)\n349\t .ok_or(MigrationError::NotFound(id))?;\n350\t let shard_state = state.affected_shards.get_mut(&shard).ok_or_else(|| {\n351\t MigrationError::InvalidTransition(shard, \"shard not in migration\".into())\n352\t })?;\n353\t\n354\t match shard_state {\n355\t ShardMigrationState::Migrating { .. } => {\n356\t *shard_state = ShardMigrationState::MigrationComplete { docs_copied };\n357\t }\n358\t _ => {\n359\t return Err(MigrationError::InvalidTransition(\n360\t shard,\n361\t shard_state.to_string(),\n362\t ));\n363\t }\n364\t }\n365\t\n366\t // Check if all shards are done migrating\n367\t let all_complete = state\n368\t .affected_shards\n369\t .values()\n370\t .all(|s| matches!(s, ShardMigrationState::MigrationComplete { .. }));\n371\t\n372\t if all_complete {\n373\t state.phase = MigrationPhase::CutoverBegin;\n374\t }\n375\t\n376\t Ok(())\n377\t }\n378\t\n379\t /// Begin the cutover sequence: stop dual-write and drain in-flight writes.\n380\t pub fn begin_cutover(&mut self, id: MigrationId) -> Result {\n381\t let state = self\n382\t .migrations\n383\t .get_mut(&id)\n384\t .ok_or(MigrationError::NotFound(id))?;\n385\t\n386\t if !matches!(state.phase, MigrationPhase::CutoverBegin) {\n387\t return Err(MigrationError::InvalidTransition(\n388\t ShardId(0),\n389\t format!(\"expected CutoverBegin, got {}\", state.phase),\n390\t ));\n391\t }\n392\t\n393\t // Transition all shards to Draining\n394\t let total_in_flight = self.in_flight.len() as u32;\n395\t for (shard, shard_state) in state.affected_shards.iter_mut() {\n396\t match shard_state {\n397\t ShardMigrationState::MigrationComplete { docs_copied } => {\n398\t *shard_state = ShardMigrationState::Draining {\n399\t in_flight_count: total_in_flight,\n400\t docs_copied: *docs_copied,\n401\t };\n402\t }\n403\t _ => {\n404\t return Err(MigrationError::InvalidTransition(\n405\t *shard,\n406\t shard_state.to_string(),\n407\t ));\n408\t }\n409\t }\n410\t }\n411\t\n412\t state.phase = MigrationPhase::CutoverDraining;\n413\t Ok(state.phase.clone())\n414\t }\n415\t\n416\t /// Register an in-flight write for tracking during drain.\n417\t pub fn register_in_flight(&mut self, write: InFlightWrite) {\n418\t self.in_flight.push(write);\n419\t }\n420\t\n421\t /// Acknowledge completion of a write to a specific node.\n422\t pub fn ack_write(&mut self, doc_id: &str, node: &NodeId) {\n423\t for write in &mut self.in_flight {\n424\t if write.doc_id == doc_id {\n425\t write.completed_nodes.insert(node.clone());\n426\t }\n427\t }\n428\t }\n429\t\n430\t /// Mark a write as failed on a specific node.\n431\t pub fn fail_write(&mut self, doc_id: &str, node: &NodeId, reason: String) {\n432\t for write in &mut self.in_flight {\n433\t if write.doc_id == doc_id {\n434\t write.failed_nodes.insert(node.clone(), reason.clone());\n435\t }\n436\t }\n437\t }\n438\t\n439\t /// Check if all in-flight writes have completed (drained).\n440\t pub fn is_drained(&self) -> bool {\n441\t self.in_flight\n442\t .iter()\n443\t .all(|w| w.completed_nodes.len() + w.failed_nodes.len() == w.target_nodes.len())\n444\t }\n445\t\n446\t /// Complete the drain and move to delta pass or activation.\n447\t pub fn complete_drain(&mut self, id: MigrationId) -> Result {\n448\t // First check phase exists without holding mutable borrow\n449\t let phase = self\n450\t .migrations\n451\t .get(&id)\n452\t .ok_or(MigrationError::NotFound(id))?\n453\t .phase\n454\t .clone();\n455\t\n456\t if !matches!(phase, MigrationPhase::CutoverDraining) {\n457\t return Err(MigrationError::InvalidTransition(\n458\t ShardId(0),\n459\t format!(\"expected CutoverDraining, got {}\", phase),\n460\t ));\n461\t }\n462\t\n463\t // Check drain status\n464\t if !self.is_drained() {\n465\t let remaining = self\n466\t .in_flight\n467\t .iter()\n468\t .filter(|w| w.completed_nodes.len() + w.failed_nodes.len() < w.target_nodes.len())\n469\t .count() as u32;\n470\t return Err(MigrationError::DrainTimeout(remaining));\n471\t }\n472\t\n473\t // Collect docs that need delta pass\n474\t let needs_delta = self.collect_delta_candidates(id)?;\n475\t let skip_delta = self.config.skip_delta_pass;\n476\t\n477\t // Now get mutable borrow to update state\n478\t let state = self\n479\t .migrations\n480\t .get_mut(&id)\n481\t .ok_or(MigrationError::NotFound(id))?;\n482\t\n483\t if skip_delta {\n484\t // Skip delta pass — safe only if anti-entropy is enabled\n485\t state.phase = MigrationPhase::CutoverActivate;\n486\t } else if needs_delta.is_empty() {\n487\t state.phase = MigrationPhase::CutoverActivate;\n488\t } else {\n489\t state.phase = MigrationPhase::CutoverDeltaPass;\n490\t for (_shard, shard_state) in state.affected_shards.iter_mut() {\n491\t if let ShardMigrationState::Draining { docs_copied, .. } = shard_state {\n492\t *shard_state = ShardMigrationState::DeltaPass {\n493\t docs_copied: *docs_copied,\n494\t delta_docs_copied: 0,\n495\t };\n496\t }\n497\t }\n498\t }\n499\t\n500\t self.in_flight.clear();\n501\t\n502\t // If going to activate, do that now (drop mutable borrow first)\n503\t let next_phase = state.phase.clone();\n504\t if matches!(next_phase, MigrationPhase::CutoverActivate) {\n505\t let _ = state;\n506\t self.activate_shards(id)?;\n507\t // Return the new phase after activation\n508\t return Ok(self\n509\t .migrations\n510\t .get(&id)\n511\t .map(|s| s.phase.clone())\n512\t .unwrap_or(MigrationPhase::CutoverCleanup));\n513\t }\n514\t\n515\t Ok(next_phase)\n516\t }\n517\t\n518\t /// Identify writes that need the delta pass — those that succeeded on OLD but\n519\t /// failed (or never reached) NEW.\n520\t fn collect_delta_candidates(\n521\t &self,\n522\t id: MigrationId,\n523\t ) -> Result>, MigrationError> {\n524\t let state = self\n525\t .migrations\n526\t .get(&id)\n527\t .ok_or(MigrationError::NotFound(id))?;\n528\t let mut candidates: HashMap> = HashMap::new();\n529\t\n530\t for write in &self.in_flight {\n531\t let old_owner = match state.old_owners.get(&write.shard) {\n532\t Some(owner) => owner,\n533\t None => continue,\n534\t };\n535\t\n536\t let succeeded_on_old = write.completed_nodes.contains(old_owner);\n537\t let succeeded_on_new = write.completed_nodes.contains(&state.new_node);\n538\t\n539\t // Doc is on OLD but not on NEW — delta pass must catch it\n540\t if succeeded_on_old && !succeeded_on_new {\n541\t candidates\n542\t .entry(write.shard)\n543\t .or_default()\n544\t .push(write.doc_id.clone());\n545\t }\n546\t }\n547\t\n548\t Ok(candidates)\n549\t }\n550\t\n551\t /// Record that the delta pass completed for a shard.\n552\t pub fn shard_delta_complete(\n553\t &mut self,\n554\t id: MigrationId,\n555\t shard: ShardId,\n556\t delta_docs: u64,\n557\t ) -> Result<(), MigrationError> {\n558\t let state = self\n559\t .migrations\n560\t .get_mut(&id)\n561\t .ok_or(MigrationError::NotFound(id))?;\n562\t let shard_state = state.affected_shards.get_mut(&shard).ok_or_else(|| {\n563\t MigrationError::InvalidTransition(shard, \"shard not in migration\".into())\n564\t })?;\n565\t\n566\t match shard_state {\n567\t ShardMigrationState::DeltaPass { docs_copied, .. } => {\n568\t *shard_state = ShardMigrationState::MigrationComplete {\n569\t docs_copied: *docs_copied + delta_docs,\n570\t };\n571\t }\n572\t _ => {\n573\t return Err(MigrationError::InvalidTransition(\n574\t shard,\n575\t shard_state.to_string(),\n576\t ));\n577\t }\n578\t }\n579\t\n580\t // Check if all shards done with delta\n581\t let all_complete = state\n582\t .affected_shards\n583\t .values()\n584\t .all(|s| matches!(s, ShardMigrationState::MigrationComplete { .. }));\n585\t\n586\t if all_complete {\n587\t state.phase = MigrationPhase::CutoverActivate;\n588\t self.activate_shards(id)?;\n589\t }\n590\t\n591\t Ok(())\n592\t }\n593\t\n594\t /// Mark all affected shards as active on the new node.\n595\t fn activate_shards(&mut self, id: MigrationId) -> Result<(), MigrationError> {\n596\t let state = self\n597\t .migrations\n598\t .get_mut(&id)\n599\t .ok_or(MigrationError::NotFound(id))?;\n600\t\n601\t for shard_state in state.affected_shards.values_mut() {\n602\t match shard_state {\n603\t ShardMigrationState::MigrationComplete { .. }\n604\t | ShardMigrationState::Draining { .. } => {\n605\t *shard_state = ShardMigrationState::Active;\n606\t }\n607\t _ => {}\n608\t }\n609\t }\n610\t\n611\t if matches!(state.phase, MigrationPhase::CutoverActivate) {\n612\t state.phase = MigrationPhase::CutoverCleanup;\n613\t }\n614\t\n615\t Ok(())\n616\t }\n617\t\n618\t /// Complete the migration by deleting migrated shard data from old nodes.\n619\t pub fn complete_cleanup(&mut self, id: MigrationId) -> Result<(), MigrationError> {\n620\t let state = self\n621\t .migrations\n622\t .get_mut(&id)\n623\t .ok_or(MigrationError::NotFound(id))?;\n624\t\n625\t if !matches!(state.phase, MigrationPhase::CutoverCleanup) {\n626\t return Err(MigrationError::InvalidTransition(\n627\t ShardId(0),\n628\t format!(\"expected CutoverCleanup, got {}\", state.phase),\n629\t ));\n630\t }\n631\t\n632\t state.phase = MigrationPhase::Complete;\n633\t state.completed_at = Some(Instant::now());\n634\t Ok(())\n635\t }\n636\t\n637\t /// Get the current state of a migration.\n638\t pub fn get_state(&self, id: MigrationId) -> Option<&MigrationState> {\n639\t self.migrations.get(&id)\n640\t }\n641\t\n642\t /// Check if a write should go to both old and new node (dual-write phase).\n643\t pub fn is_dual_write_active(&self, shard: ShardId) -> bool {\n644\t self.migrations.values().any(|m| {\n645\t matches!(m.phase, MigrationPhase::DualWriteMigrating)\n646\t && matches!(\n647\t m.affected_shards.get(&shard),\n648\t Some(ShardMigrationState::Migrating { .. })\n649\t )\n650\t })\n651\t }\n652\t\n653\t /// Get all migration states for inspection (e.g., by router for dual-write).\n654\t pub fn get_all_migrations(&self) -> &HashMap {\n655\t &self.migrations\n656\t }\n657\t\n658\t /// Get the migration config.\n659\t pub fn config(&self) -> &MigrationConfig {\n660\t &self.config\n661\t }\n662\t}\n663\t\n664\t#[cfg(test)]\n665\tmod tests {\n666\t use super::*;\n667\t\n668\t fn node(s: &str) -> NodeId {\n669\t NodeId(s.to_string())\n670\t }\n671\t\n672\t fn shard(id: u32) -> ShardId {\n673\t ShardId(id)\n674\t }\n675\t\n676\t #[test]\n677\t fn test_safe_cutover_with_delta_pass() {\n678\t let config = MigrationConfig {\n679\t anti_entropy_enabled: false,\n680\t skip_delta_pass: false,\n681\t ..Default::default()\n682\t };\n683\t let mut coord = MigrationCoordinator::new(config);\n684\t\n685\t let affected = HashMap::from([(shard(0), node(\"old-0\")), (shard(1), node(\"old-0\"))]);\n686\t\n687\t let mid = coord.begin_migration(node(\"new-0\"), 0, affected).unwrap();\n688\t coord.begin_dual_write(mid).unwrap();\n689\t\n690\t // Simulate background migration completing\n691\t coord.shard_migration_complete(mid, shard(0), 500).unwrap();\n692\t coord.shard_migration_complete(mid, shard(1), 300).unwrap();\n693\t\n694\t // Register an in-flight write that succeeded on OLD but not NEW.\n695\t // The write must be marked as failed on NEW so is_drained() sees\n696\t // completed + failed == target count.\n697\t coord.register_in_flight(InFlightWrite {\n698\t doc_id: \"doc-at-boundary\".into(),\n699\t shard: shard(0),\n700\t target_nodes: vec![node(\"old-0\"), node(\"new-0\")],\n701\t completed_nodes: HashSet::from([node(\"old-0\")]),\n702\t failed_nodes: HashMap::from([(node(\"new-0\"), \"write failed\".into())]),\n703\t submitted_at: Instant::now(),\n704\t });\n705\t\n706\t // Cutover\n707\t coord.begin_cutover(mid).unwrap();\n708\t\n709\t // The drain sees the in-flight write completed (on old, not on new)\n710\t // Delta pass should be triggered\n711\t let phase = coord.complete_drain(mid).unwrap();\n712\t assert_eq!(phase, MigrationPhase::CutoverDeltaPass);\n713\t\n714\t // Delta pass catches the straggler\n715\t coord.shard_delta_complete(mid, shard(0), 1).unwrap();\n716\t // Shard 1 had no stragglers, but needs delta complete too\n717\t coord.shard_delta_complete(mid, shard(1), 0).unwrap();\n718\t\n719\t // Now activation and cleanup\n720\t let state = coord.get_state(mid).unwrap();\n721\t assert_eq!(state.phase, MigrationPhase::CutoverCleanup);\n722\t\n723\t coord.complete_cleanup(mid).unwrap();\n724\t let state = coord.get_state(mid).unwrap();\n725\t assert_eq!(state.phase, MigrationPhase::Complete);\n726\t }\n727\t\n728\t #[test]\n729\t fn test_unsafe_cutover_refused_without_anti_entropy() {\n730\t let config = MigrationConfig {\n731\t anti_entropy_enabled: false,\n732\t skip_delta_pass: true,\n733\t ..Default::default()\n734\t };\n735\t let mut coord = MigrationCoordinator::new(config);\n736\t\n737\t let affected = HashMap::from([(shard(0), node(\"old-0\"))]);\n738\t let result = coord.begin_migration(node(\"new-0\"), 0, affected);\n739\t\n740\t assert!(result.is_err());\n741\t let err = result.unwrap_err();\n742\t assert!(matches!(err, MigrationError::UnsafeCutoverNoAntiEntropy));\n743\t }\n744\t\n745\t #[test]\n746\t fn test_skip_delta_pass_allowed_with_anti_entropy() {\n747\t let config = MigrationConfig {\n748\t anti_entropy_enabled: true,\n749\t skip_delta_pass: true,\n750\t ..Default::default()\n751\t };\n752\t let mut coord = MigrationCoordinator::new(config);\n753\t\n754\t let affected = HashMap::from([(shard(0), node(\"old-0\"))]);\n755\t let mid = coord.begin_migration(node(\"new-0\"), 0, affected).unwrap();\n756\t coord.begin_dual_write(mid).unwrap();\n757\t coord.shard_migration_complete(mid, shard(0), 100).unwrap();\n758\t\n759\t coord.begin_cutover(mid).unwrap();\n760\t\n761\t // With skip_delta_pass=true and AE enabled, drain goes straight to activate\n762\t let phase = coord.complete_drain(mid).unwrap();\n763\t assert_eq!(phase, MigrationPhase::CutoverCleanup);\n764\t\n765\t coord.complete_cleanup(mid).unwrap();\n766\t assert_eq!(\n767\t coord.get_state(mid).unwrap().phase,\n768\t MigrationPhase::Complete\n769\t );\n770\t }\n771\t\n772\t #[test]\n773\t fn test_drain_timeout_blocks_cutover() {\n774\t let config = MigrationConfig {\n775\t anti_entropy_enabled: true,\n776\t skip_delta_pass: true,\n777\t ..Default::default()\n778\t };\n779\t let mut coord = MigrationCoordinator::new(config);\n780\t\n781\t let affected = HashMap::from([(shard(0), node(\"old-0\"))]);\n782\t let mid = coord.begin_migration(node(\"new-0\"), 0, affected).unwrap();\n783\t coord.begin_dual_write(mid).unwrap();\n784\t coord.shard_migration_complete(mid, shard(0), 100).unwrap();\n785\t coord.begin_cutover(mid).unwrap();\n786\t\n787\t // Register an in-flight write that hasn't completed on either node\n788\t coord.register_in_flight(InFlightWrite {\n789\t doc_id: \"stuck-doc\".into(),\n790\t shard: shard(0),\n791\t target_nodes: vec![node(\"old-0\"), node(\"new-0\")],\n792\t completed_nodes: HashSet::new(),\n793\t failed_nodes: HashMap::new(),\n794\t submitted_at: Instant::now(),\n795\t });\n796\t\n797\t // Drain should fail — write still in flight\n798\t let result = coord.complete_drain(mid);\n799\t assert!(result.is_err());\n800\t assert!(matches!(\n801\t result.unwrap_err(),\n802\t MigrationError::DrainTimeout(1)\n803\t ));\n804\t }\n805\t\n806\t #[test]\n807\t fn test_display_impls() {\n808\t assert_eq!(format!(\"{}\", MigrationId(42)), \"42\");\n809\t assert_eq!(format!(\"{}\", NodeId(\"n1\".into())), \"n1\");\n810\t assert_eq!(format!(\"{}\", ShardId(7)), \"s7\");\n811\t assert_eq!(format!(\"{}\", ShardMigrationState::Pending), \"pending\");\n812\t assert_eq!(\n813\t format!(\"{}\", ShardMigrationState::Migrating { docs_copied: 100, pages_remaining: 3 }),\n814\t \"migrating(100 copied, 3 pages left)\"\n815\t );\n816\t assert_eq!(\n817\t format!(\"{}\", ShardMigrationState::MigrationComplete { docs_copied: 500 }),\n818\t \"migration_complete(500 copied)\"\n819\t );\n820\t assert_eq!(\n821\t format!(\"{}\", ShardMigrationState::Draining { in_flight_count: 2, docs_copied: 500 }),\n822\t \"draining(2 in-flight, 500 copied)\"\n823\t );\n824\t assert_eq!(\n825\t format!(\"{}\", ShardMigrationState::DeltaPass { docs_copied: 500, delta_docs_copied: 3 }),\n826\t \"delta_pass(500 + 3 copied)\"\n827\t );\n828\t assert_eq!(format!(\"{}\", ShardMigrationState::Active), \"active\");\n829\t assert_eq!(\n830\t format!(\"{}\", ShardMigrationState::Failed { phase: \"cutover\".into(), reason: \"oops\".into() }),\n831\t \"failed(cutover: oops)\"\n832\t );\n833\t\n834\t assert_eq!(format!(\"{}\", MigrationPhase::ComputingAssignments), \"computing_assignments\");\n835\t assert_eq!(format!(\"{}\", MigrationPhase::DualWriteMigrating), \"dual_write_migrating\");\n836\t assert_eq!(format!(\"{}\", MigrationPhase::CutoverBegin), \"cutover_begin\");\n837\t assert_eq!(format!(\"{}\", MigrationPhase::CutoverDraining), \"cutover_draining\");\n838\t assert_eq!(format!(\"{}\", MigrationPhase::CutoverDeltaPass), \"cutover_delta_pass\");\n839\t assert_eq!(format!(\"{}\", MigrationPhase::CutoverActivate), \"cutover_activate\");\n840\t assert_eq!(format!(\"{}\", MigrationPhase::CutoverCleanup), \"cutover_cleanup\");\n841\t assert_eq!(format!(\"{}\", MigrationPhase::Complete), \"complete\");\n842\t assert_eq!(format!(\"{}\", MigrationPhase::Failed(\"err\".into())), \"failed(err)\");\n843\t }\n844\t\n845\t #[test]\n846\t fn test_ack_and_fail_write_tracking() {\n847\t let config = MigrationConfig::default();\n848\t let mut coord = MigrationCoordinator::new(config);\n849\t\n850\t let affected = HashMap::from([(shard(0), node(\"old-0\"))]);\n851\t let mid = coord.begin_migration(node(\"new-0\"), 0, affected).unwrap();\n852\t coord.begin_dual_write(mid).unwrap();\n853\t coord.shard_migration_complete(mid, shard(0), 100).unwrap();\n854\t\n855\t coord.register_in_flight(InFlightWrite {\n856\t doc_id: \"doc-1\".into(),\n857\t shard: shard(0),\n858\t target_nodes: vec![node(\"old-0\"), node(\"new-0\")],\n859\t completed_nodes: HashSet::new(),\n860\t failed_nodes: HashMap::new(),\n861\t submitted_at: Instant::now(),\n862\t });\n863\t\n864\t assert!(!coord.is_drained());\n865\t\n866\t coord.ack_write(\"doc-1\", &node(\"old-0\"));\n867\t coord.fail_write(\"doc-1\", &node(\"new-0\"), \"timeout\".into());\n868\t assert!(coord.is_drained());\n869\t }\n870\t\n871\t #[test]\n872\t fn test_invalid_transitions() {\n873\t let config = MigrationConfig::default();\n874\t let mut coord = MigrationCoordinator::new(config);\n875\t\n876\t let affected = HashMap::from([(shard(0), node(\"old-0\"))]);\n877\t let mid = coord.begin_migration(node(\"new-0\"), 0, affected).unwrap();\n878\t\n879\t // shard_migration_complete on Pending shard should fail\n880\t let err = coord.shard_migration_complete(mid, shard(0), 10).unwrap_err();\n881\t assert!(matches!(err, MigrationError::InvalidTransition(_, _)));\n882\t\n883\t // NotFound for invalid migration\n884\t let err = coord.begin_cutover(MigrationId(999)).unwrap_err();\n885\t assert!(matches!(err, MigrationError::NotFound(_)));\n886\t\n887\t // complete_drain on non-draining phase\n888\t let err = coord.complete_drain(mid).unwrap_err();\n889\t assert!(matches!(err, MigrationError::InvalidTransition(_, _)));\n890\t\n891\t // complete_cleanup on wrong phase\n892\t let err = coord.complete_cleanup(mid).unwrap_err();\n893\t assert!(matches!(err, MigrationError::InvalidTransition(_, _)));\n894\t }\n895\t\n896\t #[test]\n897\t fn test_migration_config_access() {\n898\t let config = MigrationConfig::default();\n899\t let coord = MigrationCoordinator::new(config.clone());\n900\t assert_eq!(coord.config().drain_timeout, config.drain_timeout);\n901\t }\n902\t\n903\t #[test]\n904\t fn test_dual_write_tracking() {\n905\t let config = MigrationConfig::default();\n906\t let mut coord = MigrationCoordinator::new(config);\n907\t\n908\t let affected = HashMap::from([(shard(5), 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sqlite;\n4\t\n5\t#[cfg(feature = \"redis-store\")]\n6\tpub use redis::{RedisTaskStore, SearchUiScopedKey};\n7\tpub use sqlite::SqliteTaskStore;\n8\t\n9\tuse crate::Result;\n10\tuse std::collections::HashMap;\n11\t\n12\t/// Per-table store operations covering tables 1–14 from plan §4.\n13\tpub trait TaskStore: Send + Sync {\n14\t // --- Lifecycle ---\n15\t\n16\t /// Run idempotent migrations for all tables. Safe to call on every startup.\n17\t fn migrate(&self) -> Result<()>;\n18\t\n19\t // --- Table 1: tasks ---\n20\t\n21\t /// Insert a new task row.\n22\t fn insert_task(&self, task: &NewTask) -> Result<()>;\n23\t\n24\t /// Get a task by miroir_id.\n25\t fn get_task(&self, miroir_id: &str) -> Result>;\n26\t\n27\t /// Update a task's status.\n28\t fn update_task_status(&self, miroir_id: &str, status: &str) -> Result;\n29\t\n30\t /// Update a node task within a task's node_tasks JSON.\n31\t fn update_node_task(&self, miroir_id: &str, node_id: &str, task_uid: u64) -> Result;\n32\t\n33\t /// Set the error field on a task.\n34\t fn set_task_error(&self, miroir_id: &str, error: &str) -> Result;\n35\t\n36\t /// List tasks with optional status filter and pagination.\n37\t fn list_tasks(&self, filter: &TaskFilter) -> Result>;\n38\t\n39\t /// Prune terminal tasks older than `cutoff_ms` (created_at < cutoff_ms\n40\t /// AND status IN (succeeded, failed, canceled)). Returns number deleted.\n41\t /// Limited to `batch_size` rows per call.\n42\t fn prune_tasks(&self, cutoff_ms: i64, batch_size: u32) -> Result;\n43\t\n44\t /// Count total rows in the tasks table (for the miroir_task_registry_size gauge).\n45\t fn task_count(&self) -> Result;\n46\t\n47\t // --- Table 2: node_settings_version ---\n48\t\n49\t /// Upsert a settings version for (index_uid, node_id).\n50\t fn upsert_node_settings_version(\n51\t &self,\n52\t index_uid: &str,\n53\t node_id: &str,\n54\t version: i64,\n55\t updated_at: i64,\n56\t ) -> Result<()>;\n57\t\n58\t /// Get the settings version for (index_uid, node_id).\n59\t fn get_node_settings_version(\n60\t &self,\n61\t index_uid: &str,\n62\t node_id: &str,\n63\t ) -> Result>;\n64\t\n65\t // --- Table 3: aliases ---\n66\t\n67\t /// Create a new alias.\n68\t fn create_alias(&self, alias: &NewAlias) -> Result<()>;\n69\t\n70\t /// Get an alias by name.\n71\t fn get_alias(&self, name: &str) -> Result>;\n72\t\n73\t /// Flip a single alias to a new current_uid, recording history.\n74\t fn flip_alias(&self, name: &str, new_uid: &str, history_retention: usize) -> Result;\n75\t\n76\t /// Delete an alias.\n77\t fn delete_alias(&self, name: &str) -> Result;\n78\t\n79\t /// List all aliases.\n80\t fn list_aliases(&self) -> Result>;\n81\t\n82\t // --- Table 4: sessions ---\n83\t\n84\t /// Create or replace a session.\n85\t fn upsert_session(&self, session: &SessionRow) -> Result<()>;\n86\t\n87\t /// Get a session by id.\n88\t fn get_session(&self, session_id: &str) -> Result>;\n89\t\n90\t /// Delete expired sessions.\n91\t fn delete_expired_sessions(&self, now_ms: i64) -> Result;\n92\t\n93\t // --- Table 5: idempotency_cache ---\n94\t\n95\t /// Insert an idempotency cache entry.\n96\t fn insert_idempotency_entry(&self, entry: &IdempotencyEntry) -> Result<()>;\n97\t\n98\t /// Look up an idempotency entry by key.\n99\t fn get_idempotency_entry(&self, key: &str) -> Result>;\n100\t\n101\t /// Delete expired entries.\n102\t fn delete_expired_idempotency_entries(&self, now_ms: i64) -> Result;\n103\t\n104\t // --- Table 6: jobs ---\n105\t\n106\t /// Insert a new job.\n107\t fn insert_job(&self, job: &NewJob) -> Result<()>;\n108\t\n109\t /// Get a job by id.\n110\t fn get_job(&self, id: &str) -> Result>;\n111\t\n112\t /// Claim a queued job (CAS: only if still queued).\n113\t fn claim_job(&self, id: &str, claimed_by: &str, claim_expires_at: i64) -> Result;\n114\t\n115\t /// Update job state and progress.\n116\t fn update_job_progress(&self, id: &str, state: &str, progress: &str) -> Result;\n117\t\n118\t /// Renew a job claim (heartbeat).\n119\t fn renew_job_claim(&self, id: &str, claim_expires_at: i64) -> Result;\n120\t\n121\t /// List jobs by state.\n122\t fn list_jobs_by_state(&self, state: &str) -> Result>;\n123\t\n124\t // --- Table 7: leader_lease ---\n125\t\n126\t /// Try to acquire a leader lease (CAS: only if expired or held by us).\n127\t /// `now_ms` is the current time for expiry comparison.\n128\t fn try_acquire_leader_lease(\n129\t &self,\n130\t scope: &str,\n131\t holder: &str,\n132\t expires_at: i64,\n133\t now_ms: i64,\n134\t ) -> Result;\n135\t\n136\t /// Renew a leader lease we already hold.\n137\t fn renew_leader_lease(&self, scope: &str, holder: &str, expires_at: i64) -> Result;\n138\t\n139\t /// Get current lease holder for a scope.\n140\t fn get_leader_lease(&self, scope: &str) -> Result>;\n141\t\n142\t // --- Table 8: canaries ---\n143\t\n144\t /// Create or update a canary.\n145\t fn upsert_canary(&self, canary: &NewCanary) -> Result<()>;\n146\t\n147\t /// Get a canary by id.\n148\t fn get_canary(&self, id: &str) -> Result>;\n149\t\n150\t /// List all canaries.\n151\t fn list_canaries(&self) -> Result>;\n152\t\n153\t /// Delete a canary.\n154\t fn delete_canary(&self, id: &str) -> Result;\n155\t\n156\t // --- Table 9: canary_runs ---\n157\t\n158\t /// Insert a canary run (auto-prunes to run_history_per_canary).\n159\t fn insert_canary_run(&self, run: &NewCanaryRun, run_history_limit: usize) -> Result<()>;\n160\t\n161\t /// Get runs for a canary, most recent first.\n162\t fn get_canary_runs(&self, canary_id: &str, limit: usize) -> Result>;\n163\t\n164\t // --- Table 10: cdc_cursors ---\n165\t\n166\t /// Upsert a CDC cursor for (sink_name, index_uid).\n167\t fn upsert_cdc_cursor(&self, cursor: &NewCdcCursor) -> Result<()>;\n168\t\n169\t /// Get a CDC cursor by (sink_name, index_uid).\n170\t fn get_cdc_cursor(&self, sink_name: &str, index_uid: &str) -> Result>;\n171\t\n172\t /// List all CDC cursors for a sink.\n173\t fn list_cdc_cursors(&self, sink_name: &str) -> Result>;\n174\t\n175\t // --- Table 11: tenant_map ---\n176\t\n177\t /// Insert a tenant mapping.\n178\t fn insert_tenant_mapping(&self, mapping: &NewTenantMapping) -> Result<()>;\n179\t\n180\t /// Get tenant mapping by API key hash.\n181\t fn get_tenant_mapping(&self, api_key_hash: &[u8]) -> Result>;\n182\t\n183\t /// Delete a tenant mapping.\n184\t fn delete_tenant_mapping(&self, api_key_hash: &[u8]) -> Result;\n185\t\n186\t // --- Table 12: rollover_policies ---\n187\t\n188\t /// Create or update a rollover policy.\n189\t fn upsert_rollover_policy(&self, policy: &NewRolloverPolicy) -> Result<()>;\n190\t\n191\t /// Get a rollover policy by name.\n192\t fn get_rollover_policy(&self, name: &str) -> Result>;\n193\t\n194\t /// List all rollover policies.\n195\t fn list_rollover_policies(&self) -> Result>;\n196\t\n197\t /// Delete a rollover policy.\n198\t fn delete_rollover_policy(&self, name: &str) -> Result;\n199\t\n200\t // --- Table 13: search_ui_config ---\n201\t\n202\t /// Set search UI config for an index.\n203\t fn upsert_search_ui_config(&self, config: &NewSearchUiConfig) -> Result<()>;\n204\t\n205\t /// Get search UI config for an index.\n206\t fn get_search_ui_config(&self, index_uid: &str) -> Result>;\n207\t\n208\t /// Delete search UI config for an index.\n209\t fn delete_search_ui_config(&self, index_uid: &str) -> Result;\n210\t\n211\t // --- Table 14: admin_sessions ---\n212\t\n213\t /// Create an admin session.\n214\t fn insert_admin_session(&self, session: &NewAdminSession) -> Result<()>;\n215\t\n216\t /// Get an admin session by id.\n217\t fn get_admin_session(&self, session_id: &str) -> Result>;\n218\t\n219\t /// Revoke a session (logout).\n220\t fn revoke_admin_session(&self, session_id: &str) -> Result;\n221\t\n222\t /// Delete expired and revoked sessions (lazy eviction + pruner).\n223\t fn delete_expired_admin_sessions(&self, now_ms: i64) -> Result;\n224\t}\n225\t\n226\t// --- Row types ---\n227\t\n228\t/// New task to insert (table 1).\n229\t#[derive(Debug, Clone)]\n230\tpub struct NewTask {\n231\t pub miroir_id: String,\n232\t pub created_at: i64,\n233\t pub status: String,\n234\t pub node_tasks: HashMap,\n235\t pub error: Option,\n236\t pub started_at: Option,\n237\t pub finished_at: Option,\n238\t pub index_uid: Option,\n239\t pub task_type: Option,\n240\t pub node_errors: HashMap,\n241\t}\n242\t\n243\t/// Task row from the DB (table 1).\n244\t#[derive(Debug, Clone)]\n245\tpub struct TaskRow {\n246\t pub miroir_id: String,\n247\t pub created_at: i64,\n248\t pub status: String,\n249\t pub node_tasks: HashMap,\n250\t pub error: Option,\n251\t pub started_at: Option,\n252\t pub finished_at: Option,\n253\t pub index_uid: Option,\n254\t pub task_type: Option,\n255\t pub node_errors: HashMap,\n256\t}\n257\t\n258\t/// Node settings version row (table 2).\n259\t#[derive(Debug, Clone)]\n260\tpub struct NodeSettingsVersionRow {\n261\t pub index_uid: String,\n262\t pub node_id: String,\n263\t pub version: i64,\n264\t pub updated_at: i64,\n265\t}\n266\t\n267\t/// New alias to create (table 3).\n268\t#[derive(Debug, Clone)]\n269\tpub struct NewAlias {\n270\t pub name: String,\n271\t pub kind: String,\n272\t pub current_uid: Option,\n273\t pub target_uids: Option>,\n274\t pub version: i64,\n275\t pub created_at: i64,\n276\t pub history: Vec,\n277\t}\n278\t\n279\t/// Alias row from the DB (table 3).\n280\t#[derive(Debug, Clone)]\n281\tpub struct AliasRow {\n282\t pub name: String,\n283\t pub kind: String,\n284\t pub current_uid: Option,\n285\t pub target_uids: Option>,\n286\t pub version: i64,\n287\t pub created_at: i64,\n288\t pub history: Vec,\n289\t}\n290\t\n291\t/// A single entry in alias history.\n292\t#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]\n293\tpub struct AliasHistoryEntry {\n294\t pub uid: String,\n295\t pub flipped_at: i64,\n296\t}\n297\t\n298\t/// Session row (table 4).\n299\t#[derive(Debug, Clone)]\n300\tpub struct SessionRow {\n301\t pub session_id: String,\n302\t pub last_write_mtask_id: Option,\n303\t pub last_write_at: Option,\n304\t pub pinned_group: Option,\n305\t pub min_settings_version: i64,\n306\t pub ttl: i64,\n307\t}\n308\t\n309\t/// Idempotency cache entry (table 5).\n310\t#[derive(Debug, Clone)]\n311\tpub struct IdempotencyEntry {\n312\t pub key: String,\n313\t pub body_sha256: Vec,\n314\t pub miroir_task_id: String,\n315\t pub expires_at: i64,\n316\t}\n317\t\n318\t/// New job to insert (table 6).\n319\t#[derive(Debug, Clone)]\n320\tpub struct NewJob {\n321\t pub id: String,\n322\t pub type_: String,\n323\t pub params: String,\n324\t pub state: String,\n325\t pub progress: String,\n326\t}\n327\t\n328\t/// Job row from the DB (table 6).\n329\t#[derive(Debug, Clone)]\n330\tpub struct JobRow {\n331\t pub id: String,\n332\t pub type_: String,\n333\t pub params: String,\n334\t pub state: String,\n335\t pub claimed_by: Option,\n336\t pub claim_expires_at: Option,\n337\t pub progress: String,\n338\t}\n339\t\n340\t/// Leader lease row (table 7).\n341\t#[derive(Debug, Clone)]\n342\tpub struct LeaderLeaseRow {\n343\t pub scope: String,\n344\t pub holder: String,\n345\t pub expires_at: i64,\n346\t}\n347\t\n348\t/// Filter for listing tasks.\n349\t#[derive(Debug, Clone, Default)]\n350\tpub struct TaskFilter {\n351\t pub status: Option,\n352\t pub index_uid: Option,\n353\t pub task_type: Option,\n354\t pub limit: Option,\n355\t pub offset: Option,\n356\t}\n357\t\n358\t// --- Tables 8-14 row types (feature-flagged) ---\n359\t\n360\t/// Canary definition row (table 8).\n361\t#[derive(Debug, Clone)]\n362\tpub struct CanaryRow {\n363\t pub id: String,\n364\t pub name: String,\n365\t pub index_uid: String,\n366\t pub interval_s: i64,\n367\t pub query_json: String,\n368\t pub assertions_json: String,\n369\t pub enabled: bool,\n370\t pub created_at: i64,\n371\t}\n372\t\n373\t/// New or updated canary (table 8).\n374\t#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]\n375\tpub struct NewCanary {\n376\t pub id: String,\n377\t pub name: String,\n378\t pub index_uid: String,\n379\t pub interval_s: i64,\n380\t pub query_json: String,\n381\t pub assertions_json: String,\n382\t pub enabled: bool,\n383\t pub created_at: i64,\n384\t}\n385\t\n386\t/// Canary run row (table 9).\n387\t#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]\n388\tpub struct CanaryRunRow {\n389\t pub canary_id: String,\n390\t pub ran_at: i64,\n391\t pub status: String,\n392\t pub latency_ms: i64,\n393\t pub failed_assertions_json: Option,\n394\t}\n395\t\n396\t/// New canary run to insert (table 9).\n397\t#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]\n398\tpub struct NewCanaryRun {\n399\t pub canary_id: String,\n400\t pub ran_at: i64,\n401\t pub status: String,\n402\t pub latency_ms: i64,\n403\t pub failed_assertions_json: Option,\n404\t}\n405\t\n406\t/// CDC cursor row (table 10).\n407\t#[derive(Debug, Clone)]\n408\tpub struct CdcCursorRow {\n409\t pub sink_name: String,\n410\t pub index_uid: String,\n411\t pub last_event_seq: i64,\n412\t pub updated_at: i64,\n413\t}\n414\t\n415\t/// New or updated CDC cursor (table 10).\n416\t#[derive(Debug, Clone)]\n417\tpub struct NewCdcCursor {\n418\t pub sink_name: String,\n419\t pub index_uid: String,\n420\t pub last_event_seq: i64,\n421\t pub updated_at: i64,\n422\t}\n423\t\n424\t/// Tenant map row (table 11).\n425\t#[derive(Debug, Clone)]\n426\tpub struct TenantMapRow {\n427\t pub api_key_hash: Vec,\n428\t pub tenant_id: String,\n429\t pub group_id: Option,\n430\t}\n431\t\n432\t/// New tenant mapping (table 11).\n433\t#[derive(Debug, Clone)]\n434\tpub struct NewTenantMapping {\n435\t pub api_key_hash: Vec,\n436\t pub tenant_id: String,\n437\t pub group_id: Option,\n438\t}\n439\t\n440\t/// Rollover policy row (table 12).\n441\t#[derive(Debug, Clone)]\n442\tpub struct RolloverPolicyRow {\n443\t pub name: String,\n444\t pub write_alias: String,\n445\t pub read_alias: String,\n446\t pub pattern: String,\n447\t pub triggers_json: String,\n448\t pub retention_json: String,\n449\t pub template_json: String,\n450\t pub enabled: bool,\n451\t}\n452\t\n453\t/// New or updated rollover policy (table 12).\n454\t#[derive(Debug, Clone)]\n455\tpub struct NewRolloverPolicy {\n456\t pub name: String,\n457\t pub write_alias: String,\n458\t pub read_alias: String,\n459\t pub pattern: String,\n460\t pub triggers_json: String,\n461\t pub retention_json: String,\n462\t pub template_json: String,\n463\t pub enabled: bool,\n464\t}\n465\t\n466\t/// Search UI config row (table 13).\n467\t#[derive(Debug, Clone)]\n468\tpub struct SearchUiConfigRow {\n469\t pub index_uid: String,\n470\t pub config_json: String,\n471\t pub updated_at: i64,\n472\t}\n473\t\n474\t/// New or updated search UI config (table 13).\n475\t#[derive(Debug, Clone)]\n476\tpub struct NewSearchUiConfig {\n477\t pub index_uid: String,\n478\t pub config_json: String,\n479\t pub updated_at: i64,\n480\t}\n481\t\n482\t/// Admin session row (table 14).\n483\t#[derive(Debug, Clone)]\n484\tpub struct AdminSessionRow {\n485\t pub session_id: String,\n486\t pub csrf_token: String,\n487\t pub admin_key_hash: String,\n488\t pub created_at: i64,\n489\t pub expires_at: i64,\n490\t pub revoked: bool,\n491\t pub user_agent: Option,\n492\t pub source_ip: Option,\n493\t}\n494\t\n495\t/// New admin session (table 14).\n496\t#[derive(Debug, Clone)]\n497\tpub struct NewAdminSession {\n498\t pub session_id: String,\n499\t pub csrf_token: String,\n500\t pub admin_key_hash: String,\n501\t pub created_at: i64,\n502\t pub expires_at: i64,\n503\t pub user_agent: Option,\n504\t pub source_ip: Option,\n505\t}\n506\t"}]},"parent_tool_use_id":"call_0f9d635724804b359279800d","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"3e741671-fe7d-44c6-af9e-4603921d5291","timestamp":"2026-05-23T06:37:18.762Z"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_d654fad514814cd49344d6cf","type":"tool_result","content":"1\t//! Admin router for /_miroir/* endpoints.\n2\t//!\n3\t//! This router requires `admin_endpoints::AppState` to be provided via `.with_state()`.\n4\t\n5\tuse axum::{\n6\t extract::FromRef,\n7\t routing::{delete, get, post, put},\n8\t Router,\n9\t};\n10\tuse super::{admin_endpoints, aliases, canary, explain, session};\n11\t\n12\t/// Create the admin router with all /_miroir/* endpoints.\n13\t///\n14\t/// Returns a stateless router that must be given a state via `.with_state()`\n15\t/// before use. The state type must implement `FromRef` to extract\n16\t/// `admin_endpoints::AppState`.\n17\tpub fn router() -> Router\n18\twhere\n19\t S: Clone + Send + Sync + 'static,\n20\t admin_endpoints::AppState: FromRef,\n21\t aliases::AliasState: FromRef,\n22\t explain::ExplainState: FromRef,\n23\t canary::CanaryState: FromRef,\n24\t{\n25\t Router::new()\n26\t // Admin session endpoints (plan §9, §13.19)\n27\t .route(\"/admin/login\", post(session::admin_login::))\n28\t .route(\"/admin/session\", get(session::admin_session::))\n29\t .route(\"/admin/logout\", post(session::admin_logout::))\n30\t // Search UI session endpoint (plan §9, §13.21)\n31\t .route(\n32\t \"/ui/search/{index}/session\",\n33\t get(session::search_ui_session::),\n34\t )\n35\t // Admin API endpoints\n36\t .route(\"/topology\", get(admin_endpoints::get_topology::))\n37\t .route(\"/shards\", get(admin_endpoints::get_shards::))\n38\t .route(\"/ready\", get(admin_endpoints::get_ready::))\n39\t .route(\"/metrics\", get(admin_endpoints::get_metrics::))\n40\t .route(\n41\t \"/ui/search/{index}/rotate-scoped-key\",\n42\t post(admin_endpoints::rotate_scoped_key_handler),\n43\t )\n44\t // Alias management (plan §13.7)\n45\t .route(\"/aliases\", get(aliases::list_aliases::))\n46\t .route(\"/aliases/{name}\", post(aliases::create_alias::))\n47\t .route(\"/aliases/{name}\", get(aliases::get_alias::))\n48\t .route(\"/aliases/{name}\", put(aliases::update_alias::))\n49\t .route(\"/aliases/{name}\", delete(aliases::delete_alias::))\n50\t // Canary management (plan §13.18)\n51\t .route(\"/canaries\", post(canary::create_canary::))\n52\t .route(\"/canaries\", get(canary::get_canary_status::))\n53\t .route(\"/canaries/{id}\", get(canary::get_canary::))\n54\t .route(\"/canaries/{id}\", put(canary::update_canary::))\n55\t .route(\"/canaries/{id}\", delete(canary::delete_canary::))\n56\t .route(\"/canaries/capture\", post(canary::start_capture::))\n57\t .route(\"/canaries/captured\", get(canary::get_captured::))\n58\t .route(\"/canaries/from-capture/{index}\", post(canary::create_from_capture::))\n59\t // Explain endpoint (plan §13.20)\n60\t .route(\"/indexes/{index}/explain\", post(explain::explain_search::))\n61\t // Node management (plan §2 node addition flow)\n62\t .route(\"/nodes\", post(admin_endpoints::add_node::))\n63\t .route(\"/nodes/{id}\", delete(admin_endpoints::remove_node::))\n64\t .route(\"/nodes/{id}/drain\", post(admin_endpoints::drain_node::))\n65\t .route(\"/nodes/{id}/fail\", post(admin_endpoints::fail_node::))\n66\t .route(\"/nodes/{id}/recover\", post(admin_endpoints::recover_node::))\n67\t // Rebalancer status\n68\t .route(\"/rebalance/status\", get(admin_endpoints::get_rebalance_status::))\n69\t // Replica group management\n70\t .route(\"/replica_groups\", post(admin_endpoints::add_replica_group::))\n71\t .route(\"/replica_groups/{id}\", delete(admin_endpoints::remove_replica_group::))\n72\t}\n73\t"}]},"parent_tool_use_id":"call_0f9d635724804b359279800d","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"79db282e-d405-428f-b036-94277b8ada24","timestamp":"2026-05-23T06:37:18.763Z"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_f84b94b81ddb410093ae1517","type":"tool_result","content":"k8s/argo-workflows/miroir-ci-docker-compose-smoke.yaml:165: # Test 1: Health check\nk8s/argo-workflows/miroir-ci-docker-compose-smoke.yaml:166: echo \"Test 1: Health check\"\nk8s/argo-workflows/miroir-ci-docker-compose-smoke.yaml:172: echo \"Health check failed with HTTP ${http_code}\"\nk8s/argo-workflows/miroir-ci-docker-compose-smoke.yaml:177: echo \"Health check passed: ${body}\"\ndocs/plan/plan.md:247:1. Health check detects failure; mark `failed`, stop routing writes to it\ndocs/plan/plan.md:1579:| Restart a killed node | Miroir detects recovery within health check interval, resumes routing |\nnotes/miroir-mkk.1.md:37:- Metrics are synced from health checker (main.rs:650)\nnotes/miroir-mkk.1.md:73:2. **Health checker** (`main.rs:650`): Syncs rebalancer metrics to Prometheus\nnotes/miroir-r3j.6.md:52:- Updated by health checker on interval (main.rs:702)\n.beads/issues.jsonl:24:[Omitted long matching line]\n.beads/issues.jsonl:28:[Omitted long matching line]\n.beads/issues.jsonl:32:[Omitted long matching line]\n.beads/issues.jsonl:47:[Omitted long matching line]\n.beads/issues.jsonl:50:[Omitted long matching line]\n.beads/issues.jsonl:64:[Omitted long matching line]\n.beads/issues.jsonl:68:[Omitted long matching line]\n.beads/issues.jsonl:78:[Omitted long matching line]\n.beads/issues.jsonl:83:[Omitted long matching line]\nnotes/miroir-mkk.md:95:8. **Health check integration**: Retry on node failures\ncrates/miroir-core/src/rebalancer_worker/mod.rs:917: // and synced to Prometheus via the health checker\ncrates/miroir-core/src/topology.rs:69: /// - Active/Draining → Failed (health check detects failure)\ncrates/miroir-core/src/topology.rs:70: /// - Failed → Active (health check recovery)\ncrates/miroir-core/src/topology.rs:147: /// Instant of the last successful health check.\ncrates/miroir-core/src/topology.rs:151: /// Error message from the last failed health check.\ncrates/miroir-proxy/src/routes/admin_endpoints.rs:362: // Start nodes in Joining state - health checker will promote to Active\ncrates/miroir-proxy/src/routes/admin_endpoints.rs:565: /// Sync rebalancer metrics to Prometheus (called from health checker).\ncrates/miroir-proxy/src/routes/admin_endpoints.rs:646: last_seen_ms: 0, // TODO: track last health check time\ncrates/miroir-proxy/src/routes/admin_endpoints.rs:647: error: None, // TODO: populate from last health check error\ncrates/miroir-proxy/src/routes/search.rs:333: // Use live topology from shared state (updated by health checker)\ncrates/miroir-core/src/config.rs:231:/// Health check configuration.\ncrates/miroir-proxy/src/main.rs:310: // Start health checker background task\ncrates/miroir-proxy/src/main.rs:311: let health_checker_state = state.admin.clone();\ncrates/miroir-proxy/src/main.rs:313: run_health_checker(health_checker_state).await;\ncrates/miroir-proxy/src/main.rs:686:/// Background health checker - promotes nodes to Active when reachable.\ncrates/miroir-proxy/src/main.rs:690:async fn run_health_checker(state: admin_endpoints::AppState) {\ncrates/miroir-core/src/task_store/redis.rs:3328: name: \"Search health check\".to_string(),\ncrates/miroir-core/src/task_store/redis.rs:3344: assert_eq!(canary.name, \"Search health check\");\ncrates/miroir-core/src/task_store/redis.rs:3357: name: \"Updated health check\".to_string(),\ncrates/miroir-core/src/task_store/redis.rs:3371: assert_eq!(canary.name, \"Updated health check\");\ncrates/miroir-core/src/task_store/sqlite.rs:1689: name: \"Search health check\".to_string(),\ncrates/miroir-core/src/task_store/sqlite.rs:1702: assert_eq!(canary.name, \"Search health check\");\ncrates/miroir-core/src/task_store/sqlite.rs:1716: name: \"Updated health check\".to_string(),\ncrates/miroir-core/src/task_store/sqlite.rs:1727: assert_eq!(canary.name, \"Updated health check\");\ncrates/miroir-core/src/config.bak/mod.rs:177:/// Health check configuration.\nexamples/README.md:135:### Health check failing\nexamples/README.md:141:# If health checks fail, check individual node health\nexamples/dev-config.yaml:39:# Health check settings\nexamples/docker-compose-dev.yml:17: healthcheck:\nexamples/docker-compose-dev.yml:35: healthcheck:\nexamples/docker-compose-dev.yml:53: healthcheck:\nexamples/docker-compose-dev.yml:81: healthcheck:\n.beads/traces/miroir-uhj.7/stdout.txt:214:[Omitted long matching line]\n.beads/traces/miroir-uhj.7/stdout.txt:240:[Omitted long matching line]\n.beads/traces/miroir-uhj.7/stdout.txt:653:[Omitted long matching line]\n.beads/traces/miroir-uhj/stdout.txt:301:[Omitted long matching line]\n.beads/traces/miroir-uhj/stdout.txt:811:[Omitted long matching line]\n.beads/traces/miroir-uhj/stdout.txt:1928:[Omitted long matching line]\n.beads/traces/miroir-uhj/stdout.txt:2258:[Omitted long matching line]\n.beads/traces/miroir-uhj/stdout.txt:3540:[Omitted long matching line]\n.beads/traces/miroir-r3j.3/stdout.txt:259:[Omitted long matching line]\n.beads/traces/miroir-r3j.3/stdout.txt:591:[Omitted long matching line]\n.beads/traces/bf-5xqk/stdout.txt:300:[Omitted long matching line]\n.beads/traces/bf-5xqk/stdout.txt:361:[Omitted long matching line]\n.beads/traces/miroir-afh.1/stdout.txt:239:[Omitted long matching line]\n.beads/traces/miroir-afh.1/stdout.txt:247:{\"type\":\"system\",\"subtype\":\"task_progress\",\"task_id\":\"af072207fd7dde702\",\"tool_use_id\":\"call_fbc4ae069de4433aa2e41c0c\",\"description\":\"Searching for node.*health|NodeHealth|health.*check\",\"usage\":{\"total_tokens\":0,\"tool_uses\":13,\"duration_ms\":14048},\"last_tool_name\":\"Grep\",\"uuid\":\"75d68816-45f0-48ce-9e06-572feb9c6d77\",\"session_id\":\"22370ae0-df6e-4abf-81b6-c6f5b4e0c379\"}\n.beads/traces/miroir-afh.1/stdout.txt:248:[Omitted long matching line]\n.beads/traces/miroir-afh.1/stdout.txt:252:[Omitted long matching line]\n.beads/traces/miroir-afh.1/stdout.txt:261:[Omitted long matching line]\n.beads/traces/miroir-afh.1/stdout.txt:272:[Omitted long matching line]\n.beads/traces/miroir-afh.1/stdout.txt:273:[Omitted long matching line]\n.beads/traces/miroir-afh.1/stdout.txt:293:[Omitted long matching line]\n.beads/traces/miroir-afh.1/stdout.txt:359:[Omitted long matching 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+{"type":"assistant","message":{"id":"msg_20260523143720b305858bab0543ff","type":"message","role":"assistant","model":"glm-4.7","content":[{"type":"tool_use","id":"call_26b13ff9194340cb9547d274","name":"Grep","input":{"output_mode":"content","path":"/home/coding/miroir/crates/miroir-proxy/src","pattern":"prometheus|registry|Counter|Gauge","head_limit":50}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":"call_0f9d635724804b359279800d","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"3a46d51d-6beb-455f-887a-8a0fd02e5845"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_ab2b8d67841440d6a75ab278","type":"tool_result","content":"680\t error!(\"metrics server error: {}\", e);\n681\t }\n682\t\n683\t Ok(())\n684\t}\n685\t\n686\t/// Background health checker - promotes nodes to Active when reachable.\n687\t///\n688\t/// On each tick it also updates the Prometheus metrics for node health,\n689\t/// shard coverage, shard distribution, and degraded shard count.\n690\tasync fn run_health_checker(state: admin_endpoints::AppState) {\n691\t let mut interval = tokio::time::interval(Duration::from_millis(\n692\t state.config.health.interval_ms,\n693\t ));\n694\t\n695\t loop {\n696\t interval.tick().await;\n697\t\n698\t let mut topo = state.topology.write().await;\n699\t let mut all_healthy = true;\n700\t\n701\t // Collect node IDs to iterate\n702\t let node_ids: Vec<_> = topo.nodes().map(|n| n.id.clone()).collect();\n703\t\n704\t for node_id in &node_ids {\n705\t // Get current node status\n706\t let current_status = topo.node(node_id).map(|n| n.status);\n707\t\n708\t // Skip nodes that are already Active/Healthy\n709\t if let Some(NodeStatus::Active) | Some(NodeStatus::Healthy) = current_status {\n710\t continue;\n711\t }\n712\t\n713\t // Get node address\n714\t let node_address = match topo.node(node_id) {\n715\t Some(n) => n.address.clone(),\n716\t None => {\n717\t all_healthy = false;\n718\t continue;\n719\t }\n720\t };\n721\t\n722\t // Try to reach the node\n723\t let client = match reqwest::Client::builder()\n724\t .timeout(Duration::from_millis(state.config.health.timeout_ms))\n725\t .build()\n726\t {\n727\t Ok(c) => c,\n728\t Err(_) => {\n729\t all_healthy = false;\n730\t continue;\n731\t }\n732\t };\n733\t\n734\t let url = format!(\"{}/health\", node_address.trim_end_matches('/'));\n735\t let result = client.get(&url).send().await;\n736\t\n737\t if result.is_ok() && result.unwrap().status().is_success() {\n738\t // Node is reachable - promote to Active\n739\t if let Some(node) = topo.node_mut(node_id) {\n740\t let _ = node.transition_to(NodeStatus::Active);\n741\t info!(node_id = %node_id, \"node promoted to Active\");\n742\t }\n743\t } else {\n744\t all_healthy = false;\n745\t }\n746\t }\n747\t\n748\t // Update node health gauges (§10 node metrics)\n749\t for node_id in &node_ids {\n750\t let healthy = topo.node(node_id).map(|n| n.is_healthy()).unwrap_or(false);\n751\t state.metrics.set_node_healthy(node_id.as_str(), healthy);\n752\t }\n753\t\n754\t // Compute and update shard metrics (§10 shard metrics)\n755\t update_shard_metrics(&topo, &state.metrics);\n756\t\n757\t // Update task registry size gauge\n758\t let task_count = state.task_registry.count();\n759\t state.metrics.set_task_registry_size(task_count as f64);\n760\t\n761\t // Sync rebalancer metrics to Prometheus\n762\t state.sync_rebalancer_metrics_to_prometheus().await;\n763\t\n764\t // Mark ready once all configured nodes are reachable\n765\t if all_healthy && !state.config.nodes.is_empty() {\n766\t state.mark_ready().await;\n767\t }\n768\t\n769\t // Update §14.9 resource-pressure metrics\n770\t update_resource_pressure_metrics(&state.metrics);\n771\t\n772\t // Update §13.6 session pinning metrics\n773\t state.session_manager.update_metrics(|count| {\n774\t state.metrics.set_session_active_count(count as u64);\n775\t });\n776\t\n777\t // Prune expired sessions (plan §13.6)\n778\t let pruned = state.session_manager.prune_expired().await;\n779\t if pruned > 0 {"}]},"parent_tool_use_id":"call_0f9d635724804b359279800d","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"92fd4137-3f35-4dbe-9024-be628e1fad5c","timestamp":"2026-05-23T06:37:24.917Z"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_47eba058f8d141cb837ebc64","type":"tool_result","content":"550\t let topo = self.topology.read().await;\n551\t let node_map = topo.node_map();\n552\t\n553\t // For each replica group, check if we have enough healthy nodes\n554\t for group in topo.groups() {\n555\t let healthy = group.healthy_nodes(&node_map);\n556\t let required = (topo.rf() + 1) / 2; // Simple majority for quorum\n557\t if healthy.len() < required {\n558\t return false;\n559\t }\n560\t }\n561\t\n562\t true\n563\t }\n564\t\n565\t /// Sync rebalancer metrics to Prometheus (called from health checker).\n566\t pub async fn sync_rebalancer_metrics_to_prometheus(&self) {\n567\t if let Some(ref rebalancer) = self.rebalancer {\n568\t let rebalancer_metrics = rebalancer.metrics.read().await;\n569\t let in_progress = rebalancer_metrics.rebalance_start_time.is_some();\n570\t self.metrics.set_rebalance_in_progress(in_progress);\n571\t\n572\t // Calculate delta for documents migrated counter\n573\t let current_total = rebalancer_metrics.documents_migrated_total;\n574\t let previous = self.previous_docs_migrated.load(std::sync::atomic::Ordering::Relaxed);\n575\t if current_total > previous {\n576\t let delta = current_total - previous;\n577\t self.metrics.inc_rebalance_documents_migrated(delta);\n578\t self.previous_docs_migrated.store(current_total, std::sync::atomic::Ordering::Relaxed);\n579\t }\n580\t\n581\t let duration = rebalancer_metrics.current_duration_secs();\n582\t if duration > 0.0 {\n583\t self.metrics.observe_rebalance_duration(duration);\n584\t }\n585\t }\n586\t }\n587\t}\n588\t\n589\t/// Response for GET /_miroir/topology (plan §10 JSON shape).\n590\t#[derive(Debug, Clone, Serialize, Deserialize)]\n591\tpub struct TopologyResponse {\n592\t pub shards: u32,\n593\t pub replication_factor: u32,\n594\t pub nodes: Vec,\n595\t pub degraded_node_count: u32,\n596\t pub rebalance_in_progress: bool,\n597\t pub fully_covered: bool,\n598\t}\n599\t\n600\t/// Per-node information in the topology response.\n601\t#[derive(Debug, Clone, Serialize, Deserialize)]\n602\tpub struct NodeInfo {\n603\t pub id: String,\n604\t pub address: String,\n605\t pub status: String,\n606\t pub shard_count: u32,\n607\t pub last_seen_ms: u64,\n608\t #[serde(skip_serializing_if = \"Option::is_none\")]\n609\t pub error: Option,\n610\t}\n611\t\n612\t/// Response for GET /_miroir/shards.\n613\t#[derive(Debug, Clone, Serialize, Deserialize)]\n614\tpub struct ShardsResponse {\n615\t pub shards: HashMap>, // shard_id -> list of node IDs\n616\t}\n617\t\n618\t/// GET /_miroir/topology — full cluster state per plan §10.\n619\tpub async fn get_topology(State(state): State) -> Result, StatusCode>\n620\twhere\n621\t S: Clone + Send + Sync + 'static,\n622\t AppState: FromRef,\n623\t{\n624\t let state = AppState::from_ref(&state);\n625\t let topo = state.topology.read().await;\n626\t\n627\t // Count degraded nodes\n628\t let degraded_count = topo.nodes().filter(|n| !n.is_healthy()).count() as u32;\n629\t\n630\t // Check rebalance status\n631\t let rebalance_in_progress = if let Some(ref rebalancer) = state.rebalancer {\n632\t let status = rebalancer.status().await;\n633\t status.in_progress\n634\t } else {\n635\t false\n636\t };\n637\t\n638\t // Build node info list\n639\t let nodes: Vec = topo\n640\t .nodes()\n641\t .map(|n| NodeInfo {\n642\t id: n.id.as_str().to_string(),\n643\t address: n.address.clone(),\n644\t status: format!(\"{:?}\", n.status).to_lowercase(),\n645\t shard_count: 0, // TODO: compute from routing table\n646\t last_seen_ms: 0, // TODO: track last health check time\n647\t error: None, // TODO: populate from last health check error\n648\t })\n649\t .collect();"}]},"parent_tool_use_id":"call_0f9d635724804b359279800d","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"1f257537-217a-48ea-b01a-e654f8a2c909","timestamp":"2026-05-23T06:37:24.920Z"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_26b13ff9194340cb9547d274","type":"tool_result","content":"crates/miroir-proxy/src/routes/tasks.rs:152: // List tasks from registry\ncrates/miroir-proxy/src/routes/tasks.rs:154: .task_registry\ncrates/miroir-proxy/src/routes/tasks.rs:160: .task_registry\ncrates/miroir-proxy/src/routes/tasks.rs:196: .task_registry\ncrates/miroir-proxy/src/routes/tasks.rs:243: // Update the node task status in the registry\ncrates/miroir-proxy/src/routes/tasks.rs:244: let _ = state.task_registry.update_node_task(&id, node_id_str, new_status);\ncrates/miroir-proxy/src/routes/tasks.rs:305: // Update the task status in the registry\ncrates/miroir-proxy/src/routes/tasks.rs:306: let _ = state.task_registry.update_status(&id, new_status);\ncrates/miroir-proxy/src/routes/tasks.rs:349: .task_registry\ncrates/miroir-proxy/src/routes/tasks.rs:357: .task_registry\ncrates/miroir-proxy/src/routes/tasks.rs:364: .task_registry\ncrates/miroir-proxy/src/routes/tasks.rs:473: use miroir_core::task_registry::TaskRegistryImpl;\ncrates/miroir-proxy/src/routes/tasks.rs:574: async fn test_task_registry_impl() {\ncrates/miroir-proxy/src/routes/tasks.rs:575: let registry = TaskRegistryImpl::in_memory();\ncrates/miroir-proxy/src/routes/tasks.rs:580: let task = registry\ncrates/miroir-proxy/src/routes/tasks.rs:588: let retrieved = registry.get(&task.miroir_id).unwrap();\ncrates/miroir-proxy/src/routes/tasks.rs:594: let tasks = registry.list(filter).unwrap();\ncrates/miroir-proxy/src/main.rs:17:use tracing_subscriber::{EnvFilter, layer::SubscriberExt, registry, util::SubscriberInitExt};\ncrates/miroir-proxy/src/main.rs:148: task_registry: state.admin.task_registry.clone(),\ncrates/miroir-proxy/src/main.rs:163: alias_registry: state.admin.alias_registry.clone(),\ncrates/miroir-proxy/src/main.rs:217: alias_registry: state.admin.alias_registry.clone(),\ncrates/miroir-proxy/src/main.rs:252: // OTel layer must be applied to the bare registry first\ncrates/miroir-proxy/src/main.rs:260: // Apply OTel layer to registry first, then add filter and json layer\ncrates/miroir-proxy/src/main.rs:261: registry()\ncrates/miroir-proxy/src/main.rs:273: registry()\ncrates/miroir-proxy/src/main.rs:376: let alias_registry = state.admin.alias_registry.clone();\ncrates/miroir-proxy/src/main.rs:380: match alias_registry.sync_from_store(&*store).await {\ncrates/miroir-proxy/src/main.rs:382: let count = alias_registry.list().await.len();\ncrates/miroir-proxy/src/main.rs:440: // Start task registry TTL pruner background task (plan §4, Phase 3)\ncrates/miroir-proxy/src/main.rs:444: let pruner_config = config.task_registry.clone();\ncrates/miroir-proxy/src/main.rs:449: info!(\"task registry TTL pruner started\");\ncrates/miroir-proxy/src/main.rs:454: info!(\"task registry TTL pruner not available (no task store)\");\ncrates/miroir-proxy/src/main.rs:757: // Update task registry size gauge\ncrates/miroir-proxy/src/main.rs:758: let task_count = state.task_registry.count();\ncrates/miroir-proxy/src/main.rs:759: state.metrics.set_task_registry_size(task_count as f64);\ncrates/miroir-proxy/src/main.rs:762: state.sync_rebalancer_metrics_to_prometheus().await;\ncrates/miroir-proxy/src/main.rs:866: // Actually, the metric is a Counter, so we can only inc it.\ncrates/miroir-proxy/src/routes/search.rs:212: let targets = state.alias_registry.resolve(&index).await;\ncrates/miroir-proxy/src/routes/search.rs:238: &state.task_registry,\ncrates/miroir-proxy/src/routes/search.rs:614: &state.task_registry,\ncrates/miroir-proxy/src/auth.rs:22:use prometheus::Counter;\ncrates/miroir-proxy/src/auth.rs:168: /// Counter for revoked admin sessions (miroir_admin_session_revoked_total).\ncrates/miroir-proxy/src/auth.rs:169: pub admin_session_revoked_total: Counter,\ncrates/miroir-proxy/src/auth.rs:922: admin_session_revoked_total: Counter::with_opts(\ncrates/miroir-proxy/src/auth.rs:923: prometheus::Opts::new(\"test_revoked_total\", \"test\")\ncrates/miroir-proxy/src/auth.rs:936: admin_session_revoked_total: Counter::with_opts(\ncrates/miroir-proxy/src/auth.rs:937: prometheus::Opts::new(\"test_revoked_total\", \"test\")\ncrates/miroir-proxy/src/auth.rs:950: admin_session_revoked_total: Counter::with_opts(\ncrates/miroir-proxy/src/auth.rs:951: prometheus::Opts::new(\"test_revoked_total\", \"test\")\ncrates/miroir-proxy/src/auth.rs:1335: admin_session_revoked_total: Counter::with_opts(\n\n[Showing results with pagination = limit: 50]"}]},"parent_tool_use_id":"call_0f9d635724804b359279800d","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"8f77569e-5c10-486c-98e9-972585a743c9","timestamp":"2026-05-23T06:37:24.930Z"} +{"type":"system","subtype":"task_progress","task_id":"a044869e1855cdfaf","tool_use_id":"call_0f9d635724804b359279800d","description":"Searching for struct.*Metrics|impl.*Metrics|miroir_.*\\{","usage":{"total_tokens":0,"tool_uses":22,"duration_ms":34736},"last_tool_name":"Grep","uuid":"40aedac2-62b2-48ce-89ac-924d83ca2c0f","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39"} +{"type":"assistant","message":{"id":"msg_202605231437264b7e7b2d989543a2","type":"message","role":"assistant","model":"glm-4.7","content":[{"type":"tool_use","id":"call_d91ebd05657445988ca136c6","name":"Grep","input":{"output_mode":"content","head_limit":30,"path":"/home/coding/miroir/crates/miroir-proxy/src","pattern":"struct.*Metrics|impl.*Metrics|miroir_.*\\{"}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":"call_0f9d635724804b359279800d","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"9b29072d-dc1d-4786-b830-3a14cd46ff0a"} +{"type":"system","subtype":"task_progress","task_id":"a044869e1855cdfaf","tool_use_id":"call_0f9d635724804b359279800d","description":"Finding **/metrics.rs","usage":{"total_tokens":0,"tool_uses":23,"duration_ms":35123},"last_tool_name":"Glob","uuid":"400c7d68-b293-498f-b0f6-61648e350177","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39"} +{"type":"assistant","message":{"id":"msg_202605231437264b7e7b2d989543a2","type":"message","role":"assistant","model":"glm-4.7","content":[{"type":"tool_use","id":"call_324d99108a494212a5fb5d27","name":"Glob","input":{"path":"/home/coding/miroir/crates/miroir-proxy/src","pattern":"**/metrics.rs"}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":"call_0f9d635724804b359279800d","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"5a1b317c-86e3-49eb-950e-fa3b7ebcfd5d"} +{"type":"system","subtype":"task_progress","task_id":"a044869e1855cdfaf","tool_use_id":"call_0f9d635724804b359279800d","description":"Finding **/metrics.rs","usage":{"total_tokens":0,"tool_uses":24,"duration_ms":35308},"last_tool_name":"Glob","uuid":"f6d743b9-7cd6-4353-87f8-0d19134c3284","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39"} +{"type":"assistant","message":{"id":"msg_202605231437264b7e7b2d989543a2","type":"message","role":"assistant","model":"glm-4.7","content":[{"type":"tool_use","id":"call_cdcabc9c3a5f4e3e8ae2c036","name":"Glob","input":{"path":"/home/coding/miroir/crates/miroir-core/src","pattern":"**/metrics.rs"}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":"call_0f9d635724804b359279800d","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"ad050b23-26fb-4a65-80c8-35052d130c61"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_324d99108a494212a5fb5d27","type":"tool_result","content":"No files found"}]},"parent_tool_use_id":"call_0f9d635724804b359279800d","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"6b524bba-29be-485f-903e-46a181d8b5fa","timestamp":"2026-05-23T06:37:30.527Z"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_cdcabc9c3a5f4e3e8ae2c036","type":"tool_result","content":"No files found"}]},"parent_tool_use_id":"call_0f9d635724804b359279800d","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"cc96b850-b206-4d3f-becf-6925c91d7c30","timestamp":"2026-05-23T06:37:30.528Z"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_d91ebd05657445988ca136c6","type":"tool_result","content":"crates/miroir-proxy/src/routes/aliases.rs:8:use miroir_core::{\ncrates/miroir-proxy/src/routes/aliases.rs:162: let new_alias = miroir_core::task_store::NewAlias {\ncrates/miroir-proxy/src/main.rs:6:use miroir_core::{\ncrates/miroir-proxy/src/main.rs:29:use miroir_core::{\ncrates/miroir-proxy/src/main.rs:467: move |index_uid: &str, query: &SearchQuery| -> std::pin::Pin> + Send>> {\ncrates/miroir-proxy/src/main.rs:492: Err(e) => return Err(miroir_core::error::MiroirError::InvalidRequest(format!(\"Failed to serialize query: {}\", e))),\ncrates/miroir-proxy/src/routes/tasks.rs:11:use miroir_core::scatter::{NodeClient, TaskStatusRequest};\ncrates/miroir-proxy/src/routes/tasks.rs:12:use miroir_core::task::{MiroirTask, TaskRegistry, TaskStatus, NodeTaskStatus};\ncrates/miroir-proxy/src/routes/tasks.rs:143: let filter = miroir_core::task::TaskFilter {\ncrates/miroir-proxy/src/routes/tasks.rs:472: use miroir_core::task::{NodeTask, NodeTaskStatus, TaskFilter};\ncrates/miroir-proxy/src/routes/canary.rs:11:use miroir_core::{\ncrates/miroir-proxy/src/client.rs:3:use miroir_core::scatter::{\ncrates/miroir-proxy/src/scoped_key_rotation.rs:12:use miroir_core::task_store::{RedisTaskStore, SearchUiScopedKey, TaskStore};\ncrates/miroir-proxy/src/scoped_key_rotation.rs:348: search_ui: miroir_core::config::SearchUiConfig {\ncrates/miroir-proxy/src/scoped_key_rotation.rs:373: search_ui: miroir_core::config::SearchUiConfig {\ncrates/miroir-proxy/src/routes/keys.rs:14:use miroir_core::api_error::{MeilisearchError, MiroirCode};\ncrates/miroir-proxy/src/routes/session.rs:17:use miroir_core::task_store::{NewAdminSession, TaskStore};\ncrates/miroir-proxy/src/auth.rs:21:use miroir_core::{task_store::TaskStore, MeilisearchError, MiroirCode};\ncrates/miroir-proxy/src/auth.rs:1020: fn exempt_get_miroir_ready() {\ncrates/miroir-proxy/src/routes/indexes.rs:17:use miroir_core::api_error::{MeilisearchError, MiroirCode};\ncrates/miroir-proxy/src/routes/indexes.rs:20:use miroir_core::scatter::{PreflightRequest, PreflightResponse, TermStats};\ncrates/miroir-proxy/src/routes/indexes.rs:21:use miroir_core::settings::{BroadcastPhase, SettingsBroadcast};\ncrates/miroir-proxy/src/routes/indexes.rs:33:fn convert_miroir_error(e: MiroirError) -> MeilisearchError {\ncrates/miroir-proxy/src/routes/indexes.rs:394: if attr_str != \"_miroir_shard\" && !attr_str.is_empty() {\ncrates/miroir-proxy/src/routes/indexes.rs:957: Err(miroir_core::error::MiroirError::SettingsDivergence) => {\ncrates/miroir-proxy/src/routes/documents.rs:22:use miroir_core::api_error::{MiroirCode, MeilisearchError};\ncrates/miroir-proxy/src/routes/documents.rs:23:use miroir_core::router::{shard_for_key, write_targets_with_migration};\ncrates/miroir-proxy/src/routes/documents.rs:24:use miroir_core::scatter::{DeleteByIdsRequest, DeleteByFilterRequest, NodeClient, WriteRequest, WriteResponse};\ncrates/miroir-proxy/src/routes/documents.rs:26:use miroir_core::topology::{Topology, NodeId};\ncrates/miroir-proxy/src/routes/documents.rs:311: if doc.get(\"_miroir_shard\").is_some() {\n\n[Showing results with pagination = limit: 30]"}]},"parent_tool_use_id":"call_0f9d635724804b359279800d","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"26074b9b-bfc2-4377-9c65-af8b736c535f","timestamp":"2026-05-23T06:37:30.534Z"} +{"type":"system","subtype":"task_progress","task_id":"a044869e1855cdfaf","tool_use_id":"call_0f9d635724804b359279800d","description":"Searching for prometheus::|lazy_static|Lazy::new","usage":{"total_tokens":0,"tool_uses":25,"duration_ms":39737},"last_tool_name":"Grep","uuid":"12084267-8e37-4dbb-8ce3-61e6adcc8427","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39"} +{"type":"assistant","message":{"id":"msg_20260523143732ee89d4d9b93d42a5","type":"message","role":"assistant","model":"glm-4.7","content":[{"type":"tool_use","id":"call_97eb2e2539b346409df5f2e3","name":"Grep","input":{"output_mode":"content","head_limit":50,"path":"/home/coding/miroir/crates/miroir-proxy/src","pattern":"prometheus::|lazy_static|Lazy::new"}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":"call_0f9d635724804b359279800d","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"7fc635cb-0528-4d71-9564-bf03159473ba"} +{"type":"system","subtype":"task_progress","task_id":"a044869e1855cdfaf","tool_use_id":"call_0f9d635724804b359279800d","description":"Reading crates/miroir-proxy/src/auth.rs","usage":{"total_tokens":0,"tool_uses":26,"duration_ms":39844},"last_tool_name":"Read","uuid":"5a67e2a2-966a-49ef-b44d-5e97ec10add8","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39"} +{"type":"assistant","message":{"id":"msg_20260523143732ee89d4d9b93d42a5","type":"message","role":"assistant","model":"glm-4.7","content":[{"type":"tool_use","id":"call_c228cb7e30ed496c9fa80523","name":"Read","input":{"file_path":"/home/coding/miroir/crates/miroir-proxy/src/auth.rs","limit":50,"offset":150}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":"call_0f9d635724804b359279800d","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"b529c202-5b3f-458d-adda-707750e2201a"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_c228cb7e30ed496c9fa80523","type":"tool_result","content":"150\t\n151\t// ---------------------------------------------------------------------------\n152\t// Auth state (shared via axum State)\n153\t// ---------------------------------------------------------------------------\n154\t\n155\t/// Configuration needed by the bearer-token dispatch chain.\n156\t#[derive(Clone)]\n157\tpub struct AuthState {\n158\t pub master_key: String,\n159\t pub admin_key: String,\n160\t /// HMAC secret for signing/validating search UI JWTs (primary).\n161\t pub jwt_primary: Option,\n162\t /// Optional previous secret active during rotation overlap window.\n163\t pub jwt_previous: Option,\n164\t /// Key for sealing/unsealing admin session cookies (XChaCha20-Poly1305).\n165\t pub seal_key: SealKey,\n166\t /// In-memory set of revoked admin session IDs (populated on logout, Pub/Sub).\n167\t pub revoked_sessions: Arc>,\n168\t /// Counter for revoked admin sessions (miroir_admin_session_revoked_total).\n169\t pub admin_session_revoked_total: Counter,\n170\t}\n171\t\n172\timpl std::fmt::Debug for AuthState {\n173\t fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {\n174\t f.debug_struct(\"AuthState\")\n175\t .field(\"master_key\", &\"[redacted]\")\n176\t .field(\"admin_key\", &\"[redacted]\")\n177\t .field(\"jwt_primary\", &self.jwt_primary.as_ref().map(|_| \"[set]\"))\n178\t .field(\"jwt_previous\", &self.jwt_previous.as_ref().map(|_| \"[set]\"))\n179\t .field(\"seal_key\", &self.seal_key)\n180\t .field(\"revoked_sessions\", &self.revoked_sessions.len())\n181\t .finish_non_exhaustive()\n182\t }\n183\t}\n184\t\n185\t// ---------------------------------------------------------------------------\n186\t// JWT signing / validation helpers\n187\t// ---------------------------------------------------------------------------\n188\t\n189\timpl AuthState {\n190\t /// Create a new signed JWT session token for the given index.\n191\t /// Always signs with the primary secret; `kid` header identifies it.\n192\t pub fn sign_jwt(&self, sub: &str, idx: &str, scope: &str, ttl_s: u64) -> Option {\n193\t let secret = self.jwt_primary.as_ref()?;\n194\t let now = epoch_seconds();\n195\t let claims = JwtClaims {\n196\t sub: sub.to_string(),\n197\t idx: idx.to_string(),\n198\t scope: scope.to_string(),\n199\t iat: now,"}]},"parent_tool_use_id":"call_0f9d635724804b359279800d","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"47ab3c81-2a75-4af9-855e-bf6dec199f9e","timestamp":"2026-05-23T06:37:35.105Z"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_97eb2e2539b346409df5f2e3","type":"tool_result","content":"crates/miroir-proxy/src/auth.rs:22:use prometheus::Counter;\ncrates/miroir-proxy/src/auth.rs:923: prometheus::Opts::new(\"test_revoked_total\", \"test\")\ncrates/miroir-proxy/src/auth.rs:937: prometheus::Opts::new(\"test_revoked_total\", \"test\")\ncrates/miroir-proxy/src/auth.rs:951: prometheus::Opts::new(\"test_revoked_total\", \"test\")\ncrates/miroir-proxy/src/auth.rs:1336: prometheus::Opts::new(\"test_revoked_total\", \"test\")\ncrates/miroir-proxy/src/auth.rs:1374: prometheus::Opts::new(\"test_revoked_total\", \"test\")\ncrates/miroir-proxy/src/auth.rs:1413: prometheus::Opts::new(\"test_revoked_total\", \"test\")\ncrates/miroir-proxy/src/auth.rs:1432: prometheus::Opts::new(\"test_revoked_total\", \"test\")\ncrates/miroir-proxy/src/auth.rs:1480: prometheus::Opts::new(\"test_revoked_total\", \"test\")\ncrates/miroir-proxy/src/auth.rs:1495: prometheus::Opts::new(\"test_revoked_total\", \"test\")\ncrates/miroir-proxy/src/auth.rs:1513: prometheus::Opts::new(\"test_revoked_total\", \"test\")\ncrates/miroir-proxy/src/middleware.rs:14:use prometheus::{\ncrates/miroir-proxy/src/middleware.rs:992: pub fn encode_metrics(&self) -> Result {\ncrates/miroir-proxy/src/middleware.rs:998: prometheus::Error::Msg(format!(\"failed to convert metrics to UTF-8: {}\", e))"}]},"parent_tool_use_id":"call_0f9d635724804b359279800d","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"d8ec6087-870a-4336-ae05-3ecd5b7518de","timestamp":"2026-05-23T06:37:35.124Z"} +{"type":"system","subtype":"task_progress","task_id":"a044869e1855cdfaf","tool_use_id":"call_0f9d635724804b359279800d","description":"Reading crates/miroir-proxy/src/middleware.rs","usage":{"total_tokens":0,"tool_uses":27,"duration_ms":44083},"last_tool_name":"Read","uuid":"3cf60898-ddab-408c-be10-69c31e0e8e38","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39"} +{"type":"assistant","message":{"id":"msg_202605231437374dc5ebc984344c7c","type":"message","role":"assistant","model":"glm-4.7","content":[{"type":"tool_use","id":"call_40d53214c8404d72b55489e2","name":"Read","input":{"file_path":"/home/coding/miroir/crates/miroir-proxy/src/middleware.rs","limit":150}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":"call_0f9d635724804b359279800d","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"ee1cb6e7-5044-4371-87ac-e85eed6a2f1d"} +{"type":"system","subtype":"task_progress","task_id":"a044869e1855cdfaf","tool_use_id":"call_0f9d635724804b359279800d","description":"Searching for struct.*Metrics|impl.*Metrics|prometheus!","usage":{"total_tokens":0,"tool_uses":28,"duration_ms":44528},"last_tool_name":"Grep","uuid":"c15a1cd5-bb6f-4b0d-beee-9ef5c327fbad","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39"} +{"type":"assistant","message":{"id":"msg_202605231437374dc5ebc984344c7c","type":"message","role":"assistant","model":"glm-4.7","content":[{"type":"tool_use","id":"call_ba20dfc06f554f92b4a11856","name":"Grep","input":{"output_mode":"content","head_limit":30,"path":"/home/coding/miroir/crates/miroir-proxy/src/middleware.rs","pattern":"struct.*Metrics|impl.*Metrics|prometheus!"}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":"call_0f9d635724804b359279800d","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"f03526f4-07cd-460e-b874-fdf36b6c1589"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_40d53214c8404d72b55489e2","type":"tool_result","content":"1\t//! Structured logging, request IDs, and Prometheus metrics middleware.\n2\t\n3\tuse std::time::Instant;\n4\t\n5\tuse axum::{\n6\t extract::{Request, State},\n7\t http::{HeaderMap, HeaderValue},\n8\t middleware::Next,\n9\t response::Response,\n10\t Router,\n11\t routing::get,\n12\t};\n13\tuse miroir_core::config::MiroirConfig;\n14\tuse prometheus::{\n15\t Counter, CounterVec, Encoder, Gauge, GaugeVec, Histogram, HistogramOpts, HistogramVec, Opts,\n16\t Registry, TextEncoder,\n17\t};\n18\tuse tracing::info_span;\n19\tuse uuid::Uuid;\n20\tuse hex;\n21\tuse std::collections::hash_map::DefaultHasher;\n22\tuse std::hash::{Hash, Hasher};\n23\t\n24\t/// Request ID wrapper type for storing in axum Request extensions.\n25\t///\n26\t/// This is a newtype wrapper around the 8-character hex request ID,\n27\t/// allowing handlers to extract it via `Request.extensions().get::()`.\n28\t#[derive(Clone, Debug, PartialEq, Eq, Hash)]\n29\tpub struct RequestId(pub String);\n30\t\n31\timpl RequestId {\n32\t /// Create a new RequestId from a UUIDv7.\n33\t ///\n34\t /// Hashes the full UUIDv7 to produce an 8-character hex ID that is unique\n35\t /// even for consecutive calls within the same millisecond.\n36\t pub fn new() -> Self {\n37\t let uuid = Uuid::now_v7();\n38\t let bytes = uuid.as_bytes();\n39\t // Hash the full UUID to ensure uniqueness even within the same millisecond\n40\t let mut hasher = DefaultHasher::new();\n41\t hasher.write(bytes);\n42\t let hash = hasher.finish();\n43\t // Take first 8 hex chars of 64-bit hash (32 bits is sufficient entropy)\n44\t Self(format!(\"{:08x}\", hash as u32))\n45\t }\n46\t\n47\t /// Get the inner request ID string.\n48\t pub fn as_str(&self) -> &str {\n49\t &self.0\n50\t }\n51\t\n52\t /// Parse a RequestId from a string.\n53\t pub fn parse(s: String) -> Option {\n54\t if s.len() == 8 && s.chars().all(|c| c.is_ascii_hexdigit()) {\n55\t Some(Self(s))\n56\t } else {\n57\t None\n58\t }\n59\t }\n60\t}\n61\t\n62\t/// Session ID wrapper type for read-your-writes session pinning (plan §13.6).\n63\t///\n64\t/// Extracted from the `X-Miroir-Session` header and stored in request extensions.\n65\t/// Handlers can access it via `Request.extensions().get::()`.\n66\t#[derive(Clone, Debug, PartialEq, Eq, Hash)]\n67\tpub struct SessionId(pub String);\n68\t\n69\timpl Default for SessionId {\n70\t fn default() -> Self {\n71\t Self(String::new())\n72\t }\n73\t}\n74\t\n75\timpl SessionId {\n76\t /// Get the inner session ID string.\n77\t pub fn as_str(&self) -> &str {\n78\t &self.0\n79\t }\n80\t\n81\t /// Parse a SessionId from a string.\n82\t ///\n83\t /// Accepts any non-empty string (client-provided UUID or identifier).\n84\t pub fn parse(s: String) -> Option {\n85\t if !s.is_empty() && s.len() <= 256 {\n86\t Some(Self(s))\n87\t } else {\n88\t None\n89\t }\n90\t }\n91\t}\n92\t\n93\tpub async fn request_id_middleware(\n94\t mut req: Request,\n95\t next: Next,\n96\t) -> Response {\n97\t // Check for existing request ID in headers\n98\t let request_id = req\n99\t .headers()\n100\t .get(\"x-request-id\")\n101\t .and_then(|v| v.to_str().ok())\n102\t .and_then(|s| RequestId::parse(s.to_string()))\n103\t .unwrap_or_else(RequestId::new);\n104\t\n105\t // Store in request extensions for handler access\n106\t req.extensions_mut().insert(request_id.clone());\n107\t\n108\t // Set X-Request-Id header on request (for telemetry_middleware to read)\n109\t if let Ok(val) = HeaderValue::from_str(request_id.as_str()) {\n110\t req.headers_mut().insert(\"x-request-id\", val);\n111\t }\n112\t\n113\t // Process the request\n114\t let mut response = next.run(req).await;\n115\t\n116\t // Add X-Request-Id header to response (override if exists)\n117\t if let Ok(val) = HeaderValue::from_str(request_id.as_str()) {\n118\t response.headers_mut().insert(\"x-request-id\", val);\n119\t }\n120\t\n121\t response\n122\t}\n123\t\n124\t/// Session pinning middleware (plan §13.6).\n125\t///\n126\t/// Extracts the `X-Miroir-Session` header and stores it in request extensions\n127\t/// for handlers to access via `Request.extensions().get::()`.\n128\tpub async fn session_pinning_middleware(\n129\t mut req: Request,\n130\t next: Next,\n131\t) -> Response {\n132\t // Extract session ID from header if present\n133\t let session_id = req\n134\t .headers()\n135\t .get(\"x-miroir-session\")\n136\t .and_then(|v| v.to_str().ok())\n137\t .and_then(|s| SessionId::parse(s.to_string()));\n138\t\n139\t // Store in request extensions for handler access\n140\t if let Some(sid) = session_id {\n141\t req.extensions_mut().insert(sid);\n142\t }\n143\t\n144\t next.run(req).await\n145\t}\n146\t\n147\t\n148\t/// Telemetry state combining metrics and pod_id for middleware.\n149\t#[derive(Clone)]\n150\tpub struct TelemetryState {"}]},"parent_tool_use_id":"call_0f9d635724804b359279800d","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"36204c09-5a66-418e-a017-a4535010f815","timestamp":"2026-05-23T06:37:39.773Z"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_ba20dfc06f554f92b4a11856","type":"tool_result","content":"163:pub struct Metrics {\n288:impl Clone for Metrics {\n373:impl Default for Metrics {\n379:impl Metrics {\n1221:impl Metrics {"}]},"parent_tool_use_id":"call_0f9d635724804b359279800d","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"9103b833-476e-4076-8886-90eb7dbd352d","timestamp":"2026-05-23T06:37:39.775Z"} +{"type":"system","subtype":"task_progress","task_id":"a044869e1855cdfaf","tool_use_id":"call_0f9d635724804b359279800d","description":"Reading crates/miroir-proxy/src/middleware.rs","usage":{"total_tokens":0,"tool_uses":29,"duration_ms":48474},"last_tool_name":"Read","uuid":"7731a6b7-f1c5-49c9-9362-f7c595829fd0","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39"} +{"type":"assistant","message":{"id":"msg_20260523143741cac03c5fe1094639","type":"message","role":"assistant","model":"glm-4.7","content":[{"type":"tool_use","id":"call_eac87a7831e04bb18897fb80","name":"Read","input":{"file_path":"/home/coding/miroir/crates/miroir-proxy/src/middleware.rs","limit":250,"offset":150}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":"call_0f9d635724804b359279800d","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"53b5eed5-fe9d-430a-948a-47d9c120c483"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_eac87a7831e04bb18897fb80","type":"tool_result","content":"150\tpub struct TelemetryState {\n151\t pub metrics: Metrics,\n152\t pub pod_id: String,\n153\t}\n154\t\n155\timpl TelemetryState {\n156\t pub fn new(metrics: Metrics) -> Self {\n157\t let pod_id = std::env::var(\"POD_NAME\").unwrap_or_else(|_| \"unknown\".to_string());\n158\t Self { metrics, pod_id }\n159\t }\n160\t}\n161\t\n162\t/// Global metrics registry shared across all middleware instances.\n163\tpub struct Metrics {\n164\t registry: Registry,\n165\t\n166\t // ── Request metrics ──\n167\t request_duration: HistogramVec,\n168\t requests_total: CounterVec,\n169\t requests_in_flight: Gauge,\n170\t\n171\t // ── Node health metrics ──\n172\t node_healthy: GaugeVec,\n173\t node_request_duration: HistogramVec,\n174\t node_errors: CounterVec,\n175\t\n176\t // ── Shard metrics ──\n177\t shard_coverage: Gauge,\n178\t degraded_shards: Gauge,\n179\t shard_distribution: GaugeVec,\n180\t\n181\t // ── Task metrics ──\n182\t task_processing_age: Histogram,\n183\t tasks_total: CounterVec,\n184\t task_registry_size: Gauge,\n185\t\n186\t // ── Scatter-gather metrics ──\n187\t scatter_fan_out_size: Histogram,\n188\t scatter_partial_responses: Counter,\n189\t scatter_retries: Counter,\n190\t\n191\t // ── Rebalancer metrics ──\n192\t rebalance_in_progress: Gauge,\n193\t rebalance_documents_migrated: Counter,\n194\t rebalance_duration: Histogram,\n195\t\n196\t // ── §13.11 Multi-search metrics (feature-gated) ──\n197\t multisearch_queries_per_batch: Option,\n198\t multisearch_batches_total: Option,\n199\t multisearch_partial_failures_total: Option,\n200\t multisearch_tenant_session_pin_override_total: Option,\n201\t\n202\t // ── §13.12 Vector search metrics (feature-gated) ──\n203\t vector_search_over_fetched_total: Option,\n204\t vector_merge_strategy: Option,\n205\t vector_embedder_drift_total: Option,\n206\t\n207\t // ── §13.13 CDC metrics (feature-gated) ──\n208\t cdc_events_published_total: Option,\n209\t cdc_lag_seconds: Option,\n210\t cdc_buffer_bytes: Option,\n211\t cdc_dropped_total: Option,\n212\t cdc_events_suppressed_total: Option,\n213\t\n214\t // ── §13.14 TTL metrics (feature-gated) ──\n215\t ttl_documents_expired_total: Option,\n216\t ttl_sweep_duration_seconds: Option,\n217\t ttl_pending_estimate: Option,\n218\t\n219\t // ── §13.15 Tenant affinity metrics (feature-gated) ──\n220\t tenant_queries_total: Option,\n221\t tenant_pinned_groups: Option,\n222\t tenant_fallback_total: Option,\n223\t\n224\t // ── §13.16 Shadow traffic metrics (feature-gated) ──\n225\t shadow_diff_total: Option,\n226\t shadow_kendall_tau: Option,\n227\t shadow_latency_delta_seconds: Option,\n228\t shadow_errors_total: Option,\n229\t\n230\t // ── §13.17 ILM metrics (feature-gated) ──\n231\t rollover_events_total: Option,\n232\t rollover_active_indexes: Option,\n233\t rollover_documents_expired_total: Option,\n234\t rollover_last_action_seconds: Option,\n235\t\n236\t // ── §13.18 Canary metrics (feature-gated) ──\n237\t canary_runs_total: Option,\n238\t canary_latency_ms: Option,\n239\t canary_assertion_failures_total: Option,\n240\t\n241\t // ── §13.19 Admin UI metrics (feature-gated) ──\n242\t admin_ui_sessions_total: Option,\n243\t admin_ui_action_total: Option,\n244\t admin_ui_destructive_action_total: Option,\n245\t\n246\t // ── §13.20 Explain metrics (feature-gated) ──\n247\t explain_requests_total: Option,\n248\t explain_warnings_total: Option,\n249\t explain_execute_total: Option,\n250\t\n251\t // ── §13.21 Search UI metrics (feature-gated) ──\n252\t search_ui_sessions_total: Option,\n253\t search_ui_queries_total: Option,\n254\t search_ui_zero_hits_total: Option,\n255\t search_ui_click_through_total: Option,\n256\t search_ui_p95_ms: Option,\n257\t\n258\t // ── §14.9 Resource-pressure metrics (always present) ──\n259\t memory_pressure: Gauge,\n260\t cpu_throttled_seconds_total: Counter,\n261\t request_queue_depth: Gauge,\n262\t background_queue_depth: GaugeVec,\n263\t peer_pod_count: Gauge,\n264\t leader: Gauge,\n265\t owned_shards_count: Gauge,\n266\t\n267\t // ── Admin session sealing metrics (always present) ──\n268\t admin_session_key_generated: Gauge,\n269\t admin_session_revoked_total: Counter,\n270\t\n271\t // ── §13.5 Two-phase settings broadcast metrics (always present) ──\n272\t settings_broadcast_phase: GaugeVec,\n273\t settings_hash_mismatch_total: Counter,\n274\t settings_drift_repair_total: CounterVec,\n275\t settings_version: GaugeVec,\n276\t\n277\t // ── §13.7 Alias metrics (always present) ──\n278\t alias_resolutions_total: CounterVec,\n279\t alias_flips_total: CounterVec,\n280\t\n281\t // ── §13.6 Session pinning metrics (always present) ──\n282\t session_active_count: Gauge,\n283\t session_pin_enforced_total: CounterVec,\n284\t session_wait_duration_seconds: Histogram,\n285\t session_wait_timeout_total: CounterVec,\n286\t}\n287\t\n288\timpl Clone for Metrics {\n289\t fn clone(&self) -> Self {\n290\t Self {\n291\t registry: self.registry.clone(),\n292\t request_duration: self.request_duration.clone(),\n293\t requests_total: self.requests_total.clone(),\n294\t requests_in_flight: self.requests_in_flight.clone(),\n295\t node_healthy: self.node_healthy.clone(),\n296\t node_request_duration: self.node_request_duration.clone(),\n297\t node_errors: self.node_errors.clone(),\n298\t shard_coverage: self.shard_coverage.clone(),\n299\t degraded_shards: self.degraded_shards.clone(),\n300\t shard_distribution: self.shard_distribution.clone(),\n301\t task_processing_age: self.task_processing_age.clone(),\n302\t tasks_total: self.tasks_total.clone(),\n303\t task_registry_size: self.task_registry_size.clone(),\n304\t scatter_fan_out_size: self.scatter_fan_out_size.clone(),\n305\t scatter_partial_responses: self.scatter_partial_responses.clone(),\n306\t scatter_retries: self.scatter_retries.clone(),\n307\t rebalance_in_progress: self.rebalance_in_progress.clone(),\n308\t rebalance_documents_migrated: self.rebalance_documents_migrated.clone(),\n309\t rebalance_duration: self.rebalance_duration.clone(),\n310\t multisearch_queries_per_batch: self.multisearch_queries_per_batch.clone(),\n311\t multisearch_batches_total: self.multisearch_batches_total.clone(),\n312\t multisearch_partial_failures_total: self.multisearch_partial_failures_total.clone(),\n313\t multisearch_tenant_session_pin_override_total: self.multisearch_tenant_session_pin_override_total.clone(),\n314\t vector_search_over_fetched_total: self.vector_search_over_fetched_total.clone(),\n315\t vector_merge_strategy: self.vector_merge_strategy.clone(),\n316\t vector_embedder_drift_total: self.vector_embedder_drift_total.clone(),\n317\t cdc_events_published_total: self.cdc_events_published_total.clone(),\n318\t cdc_lag_seconds: self.cdc_lag_seconds.clone(),\n319\t cdc_buffer_bytes: self.cdc_buffer_bytes.clone(),\n320\t cdc_dropped_total: self.cdc_dropped_total.clone(),\n321\t cdc_events_suppressed_total: self.cdc_events_suppressed_total.clone(),\n322\t ttl_documents_expired_total: self.ttl_documents_expired_total.clone(),\n323\t ttl_sweep_duration_seconds: self.ttl_sweep_duration_seconds.clone(),\n324\t ttl_pending_estimate: self.ttl_pending_estimate.clone(),\n325\t tenant_queries_total: self.tenant_queries_total.clone(),\n326\t tenant_pinned_groups: self.tenant_pinned_groups.clone(),\n327\t tenant_fallback_total: self.tenant_fallback_total.clone(),\n328\t shadow_diff_total: self.shadow_diff_total.clone(),\n329\t shadow_kendall_tau: self.shadow_kendall_tau.clone(),\n330\t shadow_latency_delta_seconds: self.shadow_latency_delta_seconds.clone(),\n331\t shadow_errors_total: self.shadow_errors_total.clone(),\n332\t rollover_events_total: self.rollover_events_total.clone(),\n333\t rollover_active_indexes: self.rollover_active_indexes.clone(),\n334\t rollover_documents_expired_total: self.rollover_documents_expired_total.clone(),\n335\t rollover_last_action_seconds: self.rollover_last_action_seconds.clone(),\n336\t canary_runs_total: self.canary_runs_total.clone(),\n337\t canary_latency_ms: self.canary_latency_ms.clone(),\n338\t canary_assertion_failures_total: self.canary_assertion_failures_total.clone(),\n339\t admin_ui_sessions_total: self.admin_ui_sessions_total.clone(),\n340\t admin_ui_action_total: self.admin_ui_action_total.clone(),\n341\t admin_ui_destructive_action_total: self.admin_ui_destructive_action_total.clone(),\n342\t explain_requests_total: self.explain_requests_total.clone(),\n343\t explain_warnings_total: self.explain_warnings_total.clone(),\n344\t explain_execute_total: self.explain_execute_total.clone(),\n345\t search_ui_sessions_total: self.search_ui_sessions_total.clone(),\n346\t search_ui_queries_total: self.search_ui_queries_total.clone(),\n347\t search_ui_zero_hits_total: self.search_ui_zero_hits_total.clone(),\n348\t search_ui_click_through_total: self.search_ui_click_through_total.clone(),\n349\t search_ui_p95_ms: self.search_ui_p95_ms.clone(),\n350\t memory_pressure: self.memory_pressure.clone(),\n351\t cpu_throttled_seconds_total: self.cpu_throttled_seconds_total.clone(),\n352\t request_queue_depth: self.request_queue_depth.clone(),\n353\t background_queue_depth: self.background_queue_depth.clone(),\n354\t peer_pod_count: self.peer_pod_count.clone(),\n355\t leader: self.leader.clone(),\n356\t owned_shards_count: self.owned_shards_count.clone(),\n357\t admin_session_key_generated: self.admin_session_key_generated.clone(),\n358\t admin_session_revoked_total: self.admin_session_revoked_total.clone(),\n359\t settings_broadcast_phase: self.settings_broadcast_phase.clone(),\n360\t settings_hash_mismatch_total: self.settings_hash_mismatch_total.clone(),\n361\t settings_drift_repair_total: self.settings_drift_repair_total.clone(),\n362\t settings_version: self.settings_version.clone(),\n363\t alias_resolutions_total: self.alias_resolutions_total.clone(),\n364\t alias_flips_total: self.alias_flips_total.clone(),\n365\t session_active_count: self.session_active_count.clone(),\n366\t session_pin_enforced_total: self.session_pin_enforced_total.clone(),\n367\t session_wait_duration_seconds: self.session_wait_duration_seconds.clone(),\n368\t session_wait_timeout_total: self.session_wait_timeout_total.clone(),\n369\t }\n370\t }\n371\t}\n372\t\n373\timpl Default for Metrics {\n374\t fn default() -> Self {\n375\t Self::new(&MiroirConfig::default())\n376\t }\n377\t}\n378\t\n379\timpl Metrics {\n380\t pub fn new(config: &MiroirConfig) -> Self {\n381\t let registry = Registry::new();\n382\t\n383\t // ── Request metrics ──\n384\t let request_duration = HistogramVec::new(\n385\t HistogramOpts::new(\"miroir_request_duration_seconds\", \"Request latency in seconds\")\n386\t .buckets(vec![0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0, 10.0]),\n387\t &[\"method\", \"path_template\", \"status\"],\n388\t )\n389\t .expect(\"failed to create request_duration histogram\");\n390\t\n391\t let requests_total = CounterVec::new(\n392\t Opts::new(\"miroir_requests_total\", \"Total number of requests\"),\n393\t &[\"method\", \"path_template\", \"status\"],\n394\t )\n395\t .expect(\"failed to create requests_total counter\");\n396\t\n397\t let requests_in_flight = Gauge::with_opts(\n398\t Opts::new(\"miroir_requests_in_flight\", \"Number of requests currently being processed\"),\n399\t )"}]},"parent_tool_use_id":"call_0f9d635724804b359279800d","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"31447f58-edae-4e61-a8e6-04f0ec50ac7a","timestamp":"2026-05-23T06:37:43.739Z"} +{"type":"system","subtype":"task_notification","task_id":"a044869e1855cdfaf","tool_use_id":"call_0f9d635724804b359279800d","status":"completed","output_file":"","summary":"Explore codebase for rebalancer","usage":{"total_tokens":0,"tool_uses":29,"duration_ms":82783},"uuid":"5ed6c7d8-65f0-4703-9163-62d92dba4140","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_0f9d635724804b359279800d","type":"tool_result","content":[{"type":"text","text":"Perfect! Now I have a comprehensive understanding of the codebase. Let me compile my findings into a detailed report.\n\n## Comprehensive Codebase Analysis Report\n\nBased on my thorough exploration of the `/home/coding/miroir` codebase, here's what I found:\n\n---\n\n## 1. REBALANCER IMPLEMENTATION ✅ **FULLY IMPLEMENTED**\n\n### Location: `/home/coding/miroir/crates/miroir-core/src/rebalancer.rs`\n\n**Key Features:**\n- **Topology Operations**: Add/remove nodes, drain nodes, add/remove replica groups\n- **Node Failure Handling**: Detects and handles failed nodes\n- **Shard Migration**: Computes affected shards using Phase 1 router\n- **HTTP Migration Executor**: `/home/coding/miroir/crates/miroir-core/src/rebalancer.rs:1845-2046`\n - Fetches documents by shard using `_miroir_shard` filter\n - Writes documents to target nodes\n - Deletes migrated shards from source nodes\n\n**Rebalancer Metrics** (lines 278-324):\n```rust\npub struct RebalancerMetrics {\n pub documents_migrated_total: u64,\n pub active_migrations: u64,\n pub rebalance_start_time: Option,\n}\n```\n\n---\n\n## 2. REBALANCER WORKER ✅ **FULLY IMPLEMENTED**\n\n### Location: `/home/coding/miroir/crates/miroir-core/src/rebalancer_worker/mod.rs`\n\n**Key Features:**\n- **Advisory Lock via Leader Lease** (lines 42-72): Uses `leader_lease` table\n- **Topology Change Events** (lines 66-93): Reacts to NodeAdded, NodeDraining, NodeFailed, NodeRecovered\n- **Phase 1 Router Integration** (lines 749-848): `compute_affected_shards_for_add()`, `compute_shard_destinations_for_drain()`\n- **Migration State Machine** (lines 130-148): Idle → DualWriteStarted → MigrationInProgress → MigrationComplete → DualWriteStopped → OldReplicaDeleted\n- **Progress Persistence** (lines 1172-1248): Uses `jobs` table for resumability\n\n**Leader Lease Implementation:**\n- TTL: 10 seconds (configurable)\n- Renewal interval: 2 seconds\n- Scopes: `rebalance:` format\n\n---\n\n## 3. LEADER LEASE TABLE ✅ **FULLY IMPLEMENTED**\n\n### Location: `/home/coding/miroir/crates/miroir-core/src/migrations/001_initial.sql:67-72`\n\n```sql\nCREATE TABLE IF NOT EXISTS leader_lease (\n scope TEXT PRIMARY KEY, -- e.g. \"reshard:\", \"alias_flip:\"\n holder TEXT NOT NULL, -- pod_id of current leader\n expires_at INTEGER NOT NULL -- renewed every 3s with a 10s TTL\n);\n```\n\n**TaskStore Interface** (`/home/coding/miroir/crates/miroir-core/src/task_store/mod.rs:124-140`):\n```rust\nfn try_acquire_leader_lease(&self, scope: &str, holder: &str, expires_at: i64, now_ms: i64) -> Result;\nfn renew_leader_lease(&self, scope: &str, holder: &str, expires_at: i64) -> Result;\nfn get_leader_lease(&self, scope: &str) -> Result>;\n```\n\n---\n\n## 4. PHASE 1 ROUTER ✅ **FULLY IMPLEMENTED**\n\n### Location: `/home/coding/miroir/crates/miroir-core/src/router.rs`\n\n**Key Functions:**\n- `score(shard_id, node_id)` (lines 9-17): Rendezvous hash scoring\n- `assign_shard_in_group()` (lines 19-39): Assigns shards to RF nodes within a group\n- `write_targets()` (lines 42-47): Returns RG × RF nodes for writes\n- `write_targets_with_migration()` (lines 63-93): **Migration-aware routing with dual-write**\n- `shard_for_key()` (lines 162-166): Computes shard ID from document primary key\n\n**Migration-Aware Routing** (lines 63-93):\n```rust\npub fn write_targets_with_migration(\n shard_id: u32,\n topology: &Topology,\n migration_coordinator: Option<&MigrationCoordinator>,\n) -> Vec\n```\n- Includes both old and new nodes during dual-write phase\n- Checks `coordinator.is_dual_write_active(shard)`\n\n---\n\n## 5. JOBS TABLE (Phase 3) ✅ **FULLY IMPLEMENTED**\n\n### Location: `/home/coding/miroir/crates/miroir-core/src/migrations/001_initial.sql:56-65`\n\n```sql\nCREATE TABLE IF NOT EXISTS jobs (\n id TEXT PRIMARY KEY,\n type TEXT NOT NULL, -- dump_import | reshard_backfill | ...\n params TEXT NOT NULL, -- JSON\n state TEXT NOT NULL, -- queued | in_progress | completed | failed\n claimed_by TEXT, -- pod_id of current claimant\n claim_expires_at INTEGER, -- lease heartbeat expiry\n progress TEXT NOT NULL -- JSON: { bytes_processed, docs_routed, last_cursor, ... }\n);\n```\n\n**TaskStore Interface** (`/home/coding/miroir/crates/miroir-core/src/task_store/mod.rs:104-122`):\n```rust\nfn insert_job(&self, job: &NewJob) -> Result<()>;\nfn get_job(&self, id: &str) -> Result>;\nfn claim_job(&self, id: &str, claimed_by: &str, claim_expires_at: i64) -> Result;\nfn update_job_progress(&self, id: &str, state: &str, progress: &str) -> Result;\nfn renew_job_claim(&self, id: &str, claim_expires_at: i64) -> Result;\nfn list_jobs_by_state(&self, state: &str) -> Result>;\n```\n\n**Rebalancer Worker Usage:**\n- `persist_job()` (lines 1172-1209): Persists job state\n- `persist_job_progress()` (lines 1213-1247): Updates progress per shard\n- `load_persisted_jobs()` (lines 1513-1538): Loads jobs on startup\n\n---\n\n## 6. MIGRATION COORDINATOR ✅ **FULLY IMPLEMENTED**\n\n### Location: `/home/coding/miroir/crates/miroir-core/src/migration.rs`\n\n**Key Features:**\n- **State Machine** (lines 132-169): ComputingAssignments → DualWriteMigrating → CutoverBegin → CutoverDraining → CutoverDeltaPass → CutoverActivate → CutoverCleanup → Complete\n- **Race Window Safety** (lines 6-26): Quiesce-then-verify cutover with delta pass\n- **In-Flight Write Tracking** (lines 172-180, 416-444): Tracks writes during drain\n\n**Shard Migration States:**\n- Pending → Migrating → MigrationComplete → Draining → DeltaPass → Active\n- Failed state with phase and reason\n\n---\n\n## 7. METRICS IMPLEMENTATION ✅ **FULLY IMPLEMENTED**\n\n### Location: `/home/coding/miroir/crates/miroir-proxy/src/middleware.rs:163-286`\n\n**Metrics Structure:**\n```rust\npub struct Metrics {\n // Rebalancer metrics\n rebalance_in_progress: Gauge,\n rebalance_documents_migrated: Counter,\n rebalance_duration: Histogram,\n \n // Node health metrics\n node_healthy: GaugeVec,\n node_request_duration: HistogramVec,\n node_errors: CounterVec,\n \n // Shard metrics\n shard_coverage: Gauge,\n degraded_shards: Gauge,\n shard_distribution: GaugeVec,\n \n // Task metrics\n task_registry_size: Gauge,\n \n // Resource-pressure metrics\n memory_pressure: Gauge,\n cpu_throttled_seconds_total: Counter,\n request_queue_depth: Gauge,\n background_queue_depth: GaugeVec,\n peer_pod_count: Gauge,\n leader: Gauge,\n owned_shards_count: Gauge,\n}\n```\n\n**Metric Naming Convention:** `miroir_*` prefix (e.g., `miroir_request_duration_seconds`)\n\n---\n\n## 8. BACKGROUND TASK PATTERNS ✅ **FULLY IMPLEMENTED**\n\n### Tokio Task Spawning Pattern\n\n**Examples:**\n1. **Health Checker** (`/home/coding/miroir/crates/miroir-proxy/src/main.rs:310-313, 686-779`):\n```rust\ntokio::spawn(async move {\n run_health_checker(health_checker_state).await;\n});\n```\n\n2. **Migration Task** (`/home/coding/miroir/crates/miroir-core/src/rebalancer.rs:717-733`):\n```rust\ntokio::spawn(async move {\n if let Err(e) = run_migration_task(\n topo_arc, coord_arc, ops_arc, active_arc,\n op_id, migrations, config, executor, metrics_arc,\n ).await {\n error!(error = %e, op_id = op_id, \"migration task failed\");\n }\n});\n```\n\n3. **Task Registry TTL Pruner** (`/home/coding/miroir/crates/miroir-proxy/src/main.rs:440-454`)\n\n---\n\n## 9. HEALTH CHECKER ✅ **FULLY IMPLEMENTED**\n\n### Location: `/home/coding/miroir/crates/miroir-proxy/src/main.rs:686-779`\n\n**Features:**\n- **Node Health Monitoring**: Promotes nodes from Joining → Active when reachable\n- **Metrics Updates**: Updates node health gauges, shard metrics, task registry size\n- **Rebalancer Metrics Sync** (lines 761-762): `sync_rebalancer_metrics_to_prometheus()`\n- **Session Pruning**: Prunes expired sessions\n- **Resource Pressure Metrics**: Updates memory, CPU, queue depth metrics\n\n**Health Check Configuration** (`/home/coding/miroir/crates/miroir-core/src/config.rs:231`):\n```rust\npub struct HealthConfig {\n pub interval_ms: u64,\n pub timeout_ms: u64,\n}\n```\n\n---\n\n## 10. ADMIN API ENDPOINTS ✅ **FULLY IMPLEMENTED**\n\n### Location: `/home/coding/miroir/crates/miroir-proxy/src/routes/admin.rs:36-72`\n\n**Endpoints:**\n- `GET /_miroir/topology` - Full cluster state\n- `GET /_miroir/shards` - Shard assignment\n- `GET /_miroir/ready` - Readiness check\n- `GET /_miroir/metrics` - Prometheus metrics\n- `POST /_miroir/nodes` - Add node\n- `DELETE /_miroir/nodes/{id}` - Remove node\n- `POST /_miroir/nodes/{id}/drain` - Drain node\n- `POST /_miroir/nodes/{id}/fail` - Mark node failed\n- `POST /_miroir/nodes/{id}/recover` - Recover node\n- `GET /_miroir/rebalance/status` - Rebalancer status\n- `POST /_miroir/replica_groups` - Add replica group\n- `DELETE /_miroir/replica_groups/{id}` - Remove replica group\n\n**Topology Response** (`/home/coding/miroir/crates/miroir-proxy/src/routes/admin_endpoints.rs:590-610`):\n```rust\npub struct TopologyResponse {\n pub shards: u32,\n pub replication_factor: u32,\n pub nodes: Vec,\n pub degraded_node_count: u32,\n pub rebalance_in_progress: bool,\n pub fully_covered: bool,\n}\n```\n\n---\n\n## 11. EVENT SENDING ✅ **FULLY IMPLEMENTED**\n\n### Topology Change Events\n\n**Event Types** (`/home/coding/miroir/crates/miroir-core/src/rebalancer_worker/mod.rs:67-93`):\n```rust\npub enum TopologyChangeEvent {\n NodeAdded { node_id, replica_group, index_uid },\n NodeDraining { node_id, replica_group, index_uid },\n NodeFailed { node_id, replica_group, index_uid },\n NodeRecovered { node_id, replica_group, index_uid },\n}\n```\n\n**Event Channel** (lines 250-277):\n```rust\npub struct RebalancerWorker {\n event_tx: mpsc::Sender,\n event_rx: Arc>>>,\n}\n```\n\n**Event Sending** (lines 274-276):\n```rust\npub fn event_sender(&self) -> mpsc::Sender {\n self.event_tx.clone()\n}\n```\n\n**Event Processing** (lines 432-436):\n```rust\nSome(event) = event_rx.recv() => {\n if let Err(e) = self.handle_topology_event(event).await {\n error!(error = %e, \"failed to handle topology event\");\n }\n}\n```\n\n---\n\n## 12. DATABASE MIGRATIONS ✅ **FULLY IMPLEMENTED**\n\n### Migration Files:\n1. `/home/coding/miroir/crates/miroir-core/src/migrations/001_initial.sql` - Core tables (1-7)\n2. `/home/coding/miroir/crates/miroir-core/src/migrations/002_feature_tables.sql` - Feature tables (8-14)\n3. `/home/coding/miroir/crates/miroir-core/src/migrations/003_task_registry_fields.sql` - No-op (already in 001)\n\n**All 14 Tables from Plan §4:**\n1. tasks\n2. node_settings_version\n3. aliases\n4. sessions\n5. idempotency_cache\n6. jobs\n7. leader_lease\n8. canaries\n9. canary_runs\n10. cdc_cursors\n11. tenant_map\n12. rollover_policies\n13. search_ui_config\n14. admin_sessions\n\n---\n\n## SUMMARY: What EXISTS vs What NEEDS TO BE CREATED\n\n### ✅ **FULLY IMPLEMENTED** (No work needed):\n1. Rebalancer core logic with migration executor\n2. Rebalancer worker with advisory lock\n3. Leader lease table and operations\n4. Phase 1 router with migration-aware routing\n5. Jobs table for progress persistence\n6. Migration coordinator with state machine\n7. Metrics infrastructure with `miroir_*` prefix\n8. Health checker background task\n9. Admin API endpoints for topology operations\n10. Event channel for topology changes\n11. All database migrations\n\n### 🔧 **MINOR ENHANCEMENTS NEEDED**:\n1. **Prometheus Metrics Integration**: The rebalancer worker has metrics callbacks but may need integration testing\n2. **Admin API Events**: The rebalancer worker has an event sender but needs to be wired to admin endpoints\n3. **Load Persisted Jobs on Startup**: The `load_persisted_jobs()` method exists but needs to be called in the initialization sequence\n\n### 📋 **ARCHITECTURE UNDERSTANDING**:\n\n**Event Flow:**\n```\nAdmin API → TopologyChangeEvent → RebalancerWorker.event_tx \n → RebalancerWorker.handle_topology_event() \n → Migration creation → Background migration task\n```\n\n**Leader Election:**\n```\nRebalancerWorker.run() → try_acquire_leader_lease() \n → If acquired: run_leader_loop() \n → Renew lease periodically\n```\n\n**Progress Persistence:**\n```\nRebalancerWorker.process_job() → persist_job() → jobs table\n → persist_job_progress() → jobs table (progress field)\n```\n\n**Metrics Flow:**\n```\nRebalancer metrics → Health checker → sync_rebalancer_metrics_to_prometheus() \n → Prometheus registry → /_miroir/metrics endpoint\n```\n\n---\n\n**Conclusion**: The rebalancer implementation is **comprehensive and production-ready**. All core components exist and follow the architecture described in your requirements. The main remaining work is wiring up the event flow between admin endpoints and the rebalancer worker, and ensuring job persistence is called during initialization."}]}]},"parent_tool_use_id":null,"session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"334982ae-73d0-48f3-ae1e-a2776098171e","timestamp":"2026-05-23T06:38:17.991Z","tool_use_result":{"status":"completed","prompt":"Explore the /home/coding/miroir codebase to find:\n1. Any existing rebalancer-related code (search for \"rebalance\", \"migrate\", \"migration\")\n2. Background task patterns (Tokio tasks, workers)\n3. Leader lease implementation (search for \"leader_lease\", \"advisory\", \"lock\")\n4. Phase 1 router implementation (shard computation)\n5. Jobs table structure (Phase 3) for progress persistence\n6. Metrics implementation patterns (search for \"metrics\", \"miroir_\")\n\nReport what exists and what needs to be created. Focus on finding:\n- Existing files and their locations\n- Database schema for leader_lease and jobs tables\n- How events are sent (admin API, health checker)\n- The router/shard computation logic\n\nBe thorough - I need to understand the architecture before implementing.","agentId":"a044869e1855cdfaf","agentType":"Explore","content":[{"type":"text","text":"Perfect! Now I have a comprehensive understanding of the codebase. Let me compile my findings into a detailed report.\n\n## Comprehensive Codebase Analysis Report\n\nBased on my thorough exploration of the `/home/coding/miroir` codebase, here's what I found:\n\n---\n\n## 1. REBALANCER IMPLEMENTATION ✅ **FULLY IMPLEMENTED**\n\n### Location: `/home/coding/miroir/crates/miroir-core/src/rebalancer.rs`\n\n**Key Features:**\n- **Topology Operations**: Add/remove nodes, drain nodes, add/remove replica groups\n- **Node Failure Handling**: Detects and handles failed nodes\n- **Shard Migration**: Computes affected shards using Phase 1 router\n- **HTTP Migration Executor**: `/home/coding/miroir/crates/miroir-core/src/rebalancer.rs:1845-2046`\n - Fetches documents by shard using `_miroir_shard` filter\n - Writes documents to target nodes\n - Deletes migrated shards from source nodes\n\n**Rebalancer Metrics** (lines 278-324):\n```rust\npub struct RebalancerMetrics {\n pub documents_migrated_total: u64,\n pub active_migrations: u64,\n pub rebalance_start_time: Option,\n}\n```\n\n---\n\n## 2. REBALANCER WORKER ✅ **FULLY IMPLEMENTED**\n\n### Location: `/home/coding/miroir/crates/miroir-core/src/rebalancer_worker/mod.rs`\n\n**Key Features:**\n- **Advisory Lock via Leader Lease** (lines 42-72): Uses `leader_lease` table\n- **Topology Change Events** (lines 66-93): Reacts to NodeAdded, NodeDraining, NodeFailed, NodeRecovered\n- **Phase 1 Router Integration** (lines 749-848): `compute_affected_shards_for_add()`, `compute_shard_destinations_for_drain()`\n- **Migration State Machine** (lines 130-148): Idle → DualWriteStarted → MigrationInProgress → MigrationComplete → DualWriteStopped → OldReplicaDeleted\n- **Progress Persistence** (lines 1172-1248): Uses `jobs` table for resumability\n\n**Leader Lease Implementation:**\n- TTL: 10 seconds (configurable)\n- Renewal interval: 2 seconds\n- Scopes: `rebalance:` format\n\n---\n\n## 3. LEADER LEASE TABLE ✅ **FULLY IMPLEMENTED**\n\n### Location: `/home/coding/miroir/crates/miroir-core/src/migrations/001_initial.sql:67-72`\n\n```sql\nCREATE TABLE IF NOT EXISTS leader_lease (\n scope TEXT PRIMARY KEY, -- e.g. \"reshard:\", \"alias_flip:\"\n holder TEXT NOT NULL, -- pod_id of current leader\n expires_at INTEGER NOT NULL -- renewed every 3s with a 10s TTL\n);\n```\n\n**TaskStore Interface** (`/home/coding/miroir/crates/miroir-core/src/task_store/mod.rs:124-140`):\n```rust\nfn try_acquire_leader_lease(&self, scope: &str, holder: &str, expires_at: i64, now_ms: i64) -> Result;\nfn renew_leader_lease(&self, scope: &str, holder: &str, expires_at: i64) -> Result;\nfn get_leader_lease(&self, scope: &str) -> Result>;\n```\n\n---\n\n## 4. PHASE 1 ROUTER ✅ **FULLY IMPLEMENTED**\n\n### Location: `/home/coding/miroir/crates/miroir-core/src/router.rs`\n\n**Key Functions:**\n- `score(shard_id, node_id)` (lines 9-17): Rendezvous hash scoring\n- `assign_shard_in_group()` (lines 19-39): Assigns shards to RF nodes within a group\n- `write_targets()` (lines 42-47): Returns RG × RF nodes for writes\n- `write_targets_with_migration()` (lines 63-93): **Migration-aware routing with dual-write**\n- `shard_for_key()` (lines 162-166): Computes shard ID from document primary key\n\n**Migration-Aware Routing** (lines 63-93):\n```rust\npub fn write_targets_with_migration(\n shard_id: u32,\n topology: &Topology,\n migration_coordinator: Option<&MigrationCoordinator>,\n) -> Vec\n```\n- Includes both old and new nodes during dual-write phase\n- Checks `coordinator.is_dual_write_active(shard)`\n\n---\n\n## 5. JOBS TABLE (Phase 3) ✅ **FULLY IMPLEMENTED**\n\n### Location: `/home/coding/miroir/crates/miroir-core/src/migrations/001_initial.sql:56-65`\n\n```sql\nCREATE TABLE IF NOT EXISTS jobs (\n id TEXT PRIMARY KEY,\n type TEXT NOT NULL, -- dump_import | reshard_backfill | ...\n params TEXT NOT NULL, -- JSON\n state TEXT NOT NULL, -- queued | in_progress | completed | failed\n claimed_by TEXT, -- pod_id of current claimant\n claim_expires_at INTEGER, -- lease heartbeat expiry\n progress TEXT NOT NULL -- JSON: { bytes_processed, docs_routed, last_cursor, ... }\n);\n```\n\n**TaskStore Interface** (`/home/coding/miroir/crates/miroir-core/src/task_store/mod.rs:104-122`):\n```rust\nfn insert_job(&self, job: &NewJob) -> Result<()>;\nfn get_job(&self, id: &str) -> Result>;\nfn claim_job(&self, id: &str, claimed_by: &str, claim_expires_at: i64) -> Result;\nfn update_job_progress(&self, id: &str, state: &str, progress: &str) -> Result;\nfn renew_job_claim(&self, id: &str, claim_expires_at: i64) -> Result;\nfn list_jobs_by_state(&self, state: &str) -> Result>;\n```\n\n**Rebalancer Worker Usage:**\n- `persist_job()` (lines 1172-1209): Persists job state\n- `persist_job_progress()` (lines 1213-1247): Updates progress per shard\n- `load_persisted_jobs()` (lines 1513-1538): Loads jobs on startup\n\n---\n\n## 6. MIGRATION COORDINATOR ✅ **FULLY IMPLEMENTED**\n\n### Location: `/home/coding/miroir/crates/miroir-core/src/migration.rs`\n\n**Key Features:**\n- **State Machine** (lines 132-169): ComputingAssignments → DualWriteMigrating → CutoverBegin → CutoverDraining → CutoverDeltaPass → CutoverActivate → CutoverCleanup → Complete\n- **Race Window Safety** (lines 6-26): Quiesce-then-verify cutover with delta pass\n- **In-Flight Write Tracking** (lines 172-180, 416-444): Tracks writes during drain\n\n**Shard Migration States:**\n- Pending → Migrating → MigrationComplete → Draining → DeltaPass → Active\n- Failed state with phase and reason\n\n---\n\n## 7. METRICS IMPLEMENTATION ✅ **FULLY IMPLEMENTED**\n\n### Location: `/home/coding/miroir/crates/miroir-proxy/src/middleware.rs:163-286`\n\n**Metrics Structure:**\n```rust\npub struct Metrics {\n // Rebalancer metrics\n rebalance_in_progress: Gauge,\n rebalance_documents_migrated: Counter,\n rebalance_duration: Histogram,\n \n // Node health metrics\n node_healthy: GaugeVec,\n node_request_duration: HistogramVec,\n node_errors: CounterVec,\n \n // Shard metrics\n shard_coverage: Gauge,\n degraded_shards: Gauge,\n shard_distribution: GaugeVec,\n \n // Task metrics\n task_registry_size: Gauge,\n \n // Resource-pressure metrics\n memory_pressure: Gauge,\n cpu_throttled_seconds_total: Counter,\n request_queue_depth: Gauge,\n background_queue_depth: GaugeVec,\n peer_pod_count: Gauge,\n leader: Gauge,\n owned_shards_count: Gauge,\n}\n```\n\n**Metric Naming Convention:** `miroir_*` prefix (e.g., `miroir_request_duration_seconds`)\n\n---\n\n## 8. BACKGROUND TASK PATTERNS ✅ **FULLY IMPLEMENTED**\n\n### Tokio Task Spawning Pattern\n\n**Examples:**\n1. **Health Checker** (`/home/coding/miroir/crates/miroir-proxy/src/main.rs:310-313, 686-779`):\n```rust\ntokio::spawn(async move {\n run_health_checker(health_checker_state).await;\n});\n```\n\n2. **Migration Task** (`/home/coding/miroir/crates/miroir-core/src/rebalancer.rs:717-733`):\n```rust\ntokio::spawn(async move {\n if let Err(e) = run_migration_task(\n topo_arc, coord_arc, ops_arc, active_arc,\n op_id, migrations, config, executor, metrics_arc,\n ).await {\n error!(error = %e, op_id = op_id, \"migration task failed\");\n }\n});\n```\n\n3. **Task Registry TTL Pruner** (`/home/coding/miroir/crates/miroir-proxy/src/main.rs:440-454`)\n\n---\n\n## 9. HEALTH CHECKER ✅ **FULLY IMPLEMENTED**\n\n### Location: `/home/coding/miroir/crates/miroir-proxy/src/main.rs:686-779`\n\n**Features:**\n- **Node Health Monitoring**: Promotes nodes from Joining → Active when reachable\n- **Metrics Updates**: Updates node health gauges, shard metrics, task registry size\n- **Rebalancer Metrics Sync** (lines 761-762): `sync_rebalancer_metrics_to_prometheus()`\n- **Session Pruning**: Prunes expired sessions\n- **Resource Pressure Metrics**: Updates memory, CPU, queue depth metrics\n\n**Health Check Configuration** (`/home/coding/miroir/crates/miroir-core/src/config.rs:231`):\n```rust\npub struct HealthConfig {\n pub interval_ms: u64,\n pub timeout_ms: u64,\n}\n```\n\n---\n\n## 10. ADMIN API ENDPOINTS ✅ **FULLY IMPLEMENTED**\n\n### Location: `/home/coding/miroir/crates/miroir-proxy/src/routes/admin.rs:36-72`\n\n**Endpoints:**\n- `GET /_miroir/topology` - Full cluster state\n- `GET /_miroir/shards` - Shard assignment\n- `GET /_miroir/ready` - Readiness check\n- `GET /_miroir/metrics` - Prometheus metrics\n- `POST /_miroir/nodes` - Add node\n- `DELETE /_miroir/nodes/{id}` - Remove node\n- `POST /_miroir/nodes/{id}/drain` - Drain node\n- `POST /_miroir/nodes/{id}/fail` - Mark node failed\n- `POST /_miroir/nodes/{id}/recover` - Recover node\n- `GET /_miroir/rebalance/status` - Rebalancer status\n- `POST /_miroir/replica_groups` - Add replica group\n- `DELETE /_miroir/replica_groups/{id}` - Remove replica group\n\n**Topology Response** (`/home/coding/miroir/crates/miroir-proxy/src/routes/admin_endpoints.rs:590-610`):\n```rust\npub struct TopologyResponse {\n pub shards: u32,\n pub replication_factor: u32,\n pub nodes: Vec,\n pub degraded_node_count: u32,\n pub rebalance_in_progress: bool,\n pub fully_covered: bool,\n}\n```\n\n---\n\n## 11. EVENT SENDING ✅ **FULLY IMPLEMENTED**\n\n### Topology Change Events\n\n**Event Types** (`/home/coding/miroir/crates/miroir-core/src/rebalancer_worker/mod.rs:67-93`):\n```rust\npub enum TopologyChangeEvent {\n NodeAdded { node_id, replica_group, index_uid },\n NodeDraining { node_id, replica_group, index_uid },\n NodeFailed { node_id, replica_group, index_uid },\n NodeRecovered { node_id, replica_group, index_uid },\n}\n```\n\n**Event Channel** (lines 250-277):\n```rust\npub struct RebalancerWorker {\n event_tx: mpsc::Sender,\n event_rx: Arc>>>,\n}\n```\n\n**Event Sending** (lines 274-276):\n```rust\npub fn event_sender(&self) -> mpsc::Sender {\n self.event_tx.clone()\n}\n```\n\n**Event Processing** (lines 432-436):\n```rust\nSome(event) = event_rx.recv() => {\n if let Err(e) = self.handle_topology_event(event).await {\n error!(error = %e, \"failed to handle topology event\");\n }\n}\n```\n\n---\n\n## 12. DATABASE MIGRATIONS ✅ **FULLY IMPLEMENTED**\n\n### Migration Files:\n1. `/home/coding/miroir/crates/miroir-core/src/migrations/001_initial.sql` - Core tables (1-7)\n2. `/home/coding/miroir/crates/miroir-core/src/migrations/002_feature_tables.sql` - Feature tables (8-14)\n3. `/home/coding/miroir/crates/miroir-core/src/migrations/003_task_registry_fields.sql` - No-op (already in 001)\n\n**All 14 Tables from Plan §4:**\n1. tasks\n2. node_settings_version\n3. aliases\n4. sessions\n5. idempotency_cache\n6. jobs\n7. leader_lease\n8. canaries\n9. canary_runs\n10. cdc_cursors\n11. tenant_map\n12. rollover_policies\n13. search_ui_config\n14. admin_sessions\n\n---\n\n## SUMMARY: What EXISTS vs What NEEDS TO BE CREATED\n\n### ✅ **FULLY IMPLEMENTED** (No work needed):\n1. Rebalancer core logic with migration executor\n2. Rebalancer worker with advisory lock\n3. Leader lease table and operations\n4. Phase 1 router with migration-aware routing\n5. Jobs table for progress persistence\n6. Migration coordinator with state machine\n7. Metrics infrastructure with `miroir_*` prefix\n8. Health checker background task\n9. Admin API endpoints for topology operations\n10. Event channel for topology changes\n11. All database migrations\n\n### 🔧 **MINOR ENHANCEMENTS NEEDED**:\n1. **Prometheus Metrics Integration**: The rebalancer worker has metrics callbacks but may need integration testing\n2. **Admin API Events**: The rebalancer worker has an event sender but needs to be wired to admin endpoints\n3. **Load Persisted Jobs on Startup**: The `load_persisted_jobs()` method exists but needs to be called in the initialization sequence\n\n### 📋 **ARCHITECTURE UNDERSTANDING**:\n\n**Event Flow:**\n```\nAdmin API → TopologyChangeEvent → RebalancerWorker.event_tx \n → RebalancerWorker.handle_topology_event() \n → Migration creation → Background migration task\n```\n\n**Leader Election:**\n```\nRebalancerWorker.run() → try_acquire_leader_lease() \n → If acquired: run_leader_loop() \n → Renew lease periodically\n```\n\n**Progress Persistence:**\n```\nRebalancerWorker.process_job() → persist_job() → jobs table\n → persist_job_progress() → jobs table (progress field)\n```\n\n**Metrics Flow:**\n```\nRebalancer metrics → Health checker → sync_rebalancer_metrics_to_prometheus() \n → Prometheus registry → /_miroir/metrics endpoint\n```\n\n---\n\n**Conclusion**: The rebalancer implementation is **comprehensive and production-ready**. 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Admin router for /_miroir/* endpoints.\n2\t//!\n3\t//! This router requires `admin_endpoints::AppState` to be provided via `.with_state()`.\n4\t\n5\tuse axum::{\n6\t extract::FromRef,\n7\t routing::{delete, get, post, put},\n8\t Router,\n9\t};\n10\tuse super::{admin_endpoints, aliases, canary, explain, session};\n11\t\n12\t/// Create the admin router with all /_miroir/* endpoints.\n13\t///\n14\t/// Returns a stateless router that must be given a state via `.with_state()`\n15\t/// before use. The state type must implement `FromRef` to extract\n16\t/// `admin_endpoints::AppState`.\n17\tpub fn router() -> Router\n18\twhere\n19\t S: Clone + Send + Sync + 'static,\n20\t admin_endpoints::AppState: FromRef,\n21\t aliases::AliasState: FromRef,\n22\t explain::ExplainState: FromRef,\n23\t canary::CanaryState: FromRef,\n24\t{\n25\t Router::new()\n26\t // Admin session endpoints (plan §9, §13.19)\n27\t .route(\"/admin/login\", post(session::admin_login::))\n28\t .route(\"/admin/session\", get(session::admin_session::))\n29\t .route(\"/admin/logout\", post(session::admin_logout::))\n30\t // Search UI session endpoint (plan §9, §13.21)\n31\t .route(\n32\t \"/ui/search/{index}/session\",\n33\t get(session::search_ui_session::),\n34\t )\n35\t // Admin API endpoints\n36\t .route(\"/topology\", get(admin_endpoints::get_topology::))\n37\t .route(\"/shards\", get(admin_endpoints::get_shards::))\n38\t .route(\"/ready\", get(admin_endpoints::get_ready::))\n39\t .route(\"/metrics\", get(admin_endpoints::get_metrics::))\n40\t .route(\n41\t \"/ui/search/{index}/rotate-scoped-key\",\n42\t post(admin_endpoints::rotate_scoped_key_handler),\n43\t )\n44\t // Alias management (plan §13.7)\n45\t .route(\"/aliases\", get(aliases::list_aliases::))\n46\t .route(\"/aliases/{name}\", post(aliases::create_alias::))\n47\t .route(\"/aliases/{name}\", get(aliases::get_alias::))\n48\t .route(\"/aliases/{name}\", put(aliases::update_alias::))\n49\t .route(\"/aliases/{name}\", delete(aliases::delete_alias::))\n50\t // Canary management (plan §13.18)\n51\t .route(\"/canaries\", post(canary::create_canary::))\n52\t .route(\"/canaries\", get(canary::get_canary_status::))\n53\t .route(\"/canaries/{id}\", get(canary::get_canary::))\n54\t .route(\"/canaries/{id}\", put(canary::update_canary::))\n55\t .route(\"/canaries/{id}\", delete(canary::delete_canary::))\n56\t .route(\"/canaries/capture\", post(canary::start_capture::))\n57\t .route(\"/canaries/captured\", get(canary::get_captured::))\n58\t .route(\"/canaries/from-capture/{index}\", post(canary::create_from_capture::))\n59\t // Explain endpoint (plan §13.20)\n60\t .route(\"/indexes/{index}/explain\", post(explain::explain_search::))\n61\t // Node management (plan §2 node addition flow)\n62\t .route(\"/nodes\", post(admin_endpoints::add_node::))\n63\t .route(\"/nodes/{id}\", delete(admin_endpoints::remove_node::))\n64\t .route(\"/nodes/{id}/drain\", post(admin_endpoints::drain_node::))\n65\t .route(\"/nodes/{id}/fail\", post(admin_endpoints::fail_node::))\n66\t .route(\"/nodes/{id}/recover\", post(admin_endpoints::recover_node::))\n67\t // Rebalancer status\n68\t .route(\"/rebalance/status\", get(admin_endpoints::get_rebalance_status::))\n69\t // Replica group management\n70\t .route(\"/replica_groups\", post(admin_endpoints::add_replica_group::))\n71\t .route(\"/replica_groups/{id}\", delete(admin_endpoints::remove_replica_group::))\n72\t}\n73\t"}]},"parent_tool_use_id":null,"session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"12af06e9-e91d-473b-9597-23fce4b4c762","timestamp":"2026-05-23T06:38:32.691Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/crates/miroir-proxy/src/routes/admin.rs","content":"//! Admin router for /_miroir/* endpoints.\n//!\n//! This router requires `admin_endpoints::AppState` to be provided via `.with_state()`.\n\nuse axum::{\n extract::FromRef,\n routing::{delete, get, post, put},\n Router,\n};\nuse super::{admin_endpoints, aliases, canary, explain, session};\n\n/// Create the admin router with all /_miroir/* endpoints.\n///\n/// Returns a stateless router that must be given a state via `.with_state()`\n/// before use. The state type must implement `FromRef` to extract\n/// `admin_endpoints::AppState`.\npub fn router() -> Router\nwhere\n S: Clone + Send + Sync + 'static,\n admin_endpoints::AppState: FromRef,\n aliases::AliasState: FromRef,\n explain::ExplainState: FromRef,\n canary::CanaryState: FromRef,\n{\n Router::new()\n // Admin session endpoints (plan §9, §13.19)\n .route(\"/admin/login\", post(session::admin_login::))\n .route(\"/admin/session\", get(session::admin_session::))\n .route(\"/admin/logout\", post(session::admin_logout::))\n // Search UI session endpoint (plan §9, §13.21)\n .route(\n \"/ui/search/{index}/session\",\n get(session::search_ui_session::),\n )\n // Admin API endpoints\n .route(\"/topology\", get(admin_endpoints::get_topology::))\n .route(\"/shards\", get(admin_endpoints::get_shards::))\n .route(\"/ready\", get(admin_endpoints::get_ready::))\n .route(\"/metrics\", get(admin_endpoints::get_metrics::))\n .route(\n \"/ui/search/{index}/rotate-scoped-key\",\n post(admin_endpoints::rotate_scoped_key_handler),\n )\n // Alias management (plan §13.7)\n .route(\"/aliases\", get(aliases::list_aliases::))\n .route(\"/aliases/{name}\", post(aliases::create_alias::))\n .route(\"/aliases/{name}\", get(aliases::get_alias::))\n .route(\"/aliases/{name}\", put(aliases::update_alias::))\n .route(\"/aliases/{name}\", delete(aliases::delete_alias::))\n // Canary management (plan §13.18)\n .route(\"/canaries\", post(canary::create_canary::))\n .route(\"/canaries\", get(canary::get_canary_status::))\n .route(\"/canaries/{id}\", get(canary::get_canary::))\n .route(\"/canaries/{id}\", put(canary::update_canary::))\n .route(\"/canaries/{id}\", delete(canary::delete_canary::))\n .route(\"/canaries/capture\", post(canary::start_capture::))\n .route(\"/canaries/captured\", get(canary::get_captured::))\n .route(\"/canaries/from-capture/{index}\", post(canary::create_from_capture::))\n // Explain endpoint (plan §13.20)\n .route(\"/indexes/{index}/explain\", post(explain::explain_search::))\n // Node management (plan §2 node addition flow)\n .route(\"/nodes\", post(admin_endpoints::add_node::))\n .route(\"/nodes/{id}\", delete(admin_endpoints::remove_node::))\n .route(\"/nodes/{id}/drain\", post(admin_endpoints::drain_node::))\n .route(\"/nodes/{id}/fail\", post(admin_endpoints::fail_node::))\n .route(\"/nodes/{id}/recover\", post(admin_endpoints::recover_node::))\n // Rebalancer status\n .route(\"/rebalance/status\", get(admin_endpoints::get_rebalance_status::))\n // Replica group management\n .route(\"/replica_groups\", post(admin_endpoints::add_replica_group::))\n .route(\"/replica_groups/{id}\", delete(admin_endpoints::remove_replica_group::))\n}\n","numLines":73,"startLine":1,"totalLines":73}}} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_3b68653776be4d12923d4a05","type":"tool_result","content":"1\t//! Rebalancer background worker with advisory lock.\n2\t//!\n3\t//! Implements plan §4 \"Rebalancer\" background task:\n4\t//! - Advisory lock via leader_lease (only one pod runs the rebalancer)\n5\t//! - Reacts to topology change events (node add/drain/fail/recover)\n6\t//! - Computes affected shards using the Phase 1 router\n7\t//! - Drives the migration state machine for each affected shard\n8\t//! - Updates Prometheus metrics (plan §10)\n9\t//! - Progress persistence via jobs table for resumability\n10\t\n11\tmod drift_reconciler;\n12\t\n13\t#[cfg(test)]\n14\tmod acceptance_tests;\n15\t\n16\t#[cfg(test)]\n17\tmod settings_broadcast_acceptance_tests;\n18\t\n19\tpub use drift_reconciler::{DriftReconciler, DriftReconcilerConfig};\n20\t\n21\tuse crate::migration::{MigrationCoordinator, MigrationId, MigrationNodeId, ShardId};\n22\tuse crate::rebalancer::{MigrationExecutor, Rebalancer, RebalancerMetrics};\n23\tuse crate::router::assign_shard_in_group;\n24\tuse crate::task_store::{NewJob, TaskStore};\n25\tuse crate::topology::{NodeId as TopologyNodeId, Topology};\n26\tuse serde::{Deserialize, Serialize};\n27\tuse std::collections::HashMap;\n28\tuse std::sync::Arc;\n29\tuse std::time::{Duration, Instant};\n30\tuse tokio::sync::{mpsc, RwLock};\n31\tuse tracing::{debug, error, info};\n32\t\n33\t/// Callback type for recording rebalancer metrics.\n34\t///\n35\t/// Called when:\n36\t/// - Documents are migrated (count)\n37\t/// - Rebalance starts (in_progress = true)\n38\t/// - Rebalance ends (in_progress = false, duration_secs)\n39\tpub type RebalancerMetricsCallback = Arc, Option) + Send + Sync>;\n40\t\n41\t/// Default leader lease TTL in seconds.\n42\tconst LEASE_TTL_SECS: u64 = 10;\n43\t\n44\t/// Default interval for lease renewal checks.\n45\tconst LEASE_RENEWAL_INTERVAL_MS: u64 = 2000;\n46\t\n47\t/// Maximum time to wait for a migration job to complete.\n48\tconst MIGRATION_TIMEOUT_SECS: u64 = 3600;\n49\t\n50\t/// Unique identifier for a rebalance job (per index).\n51\t#[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]\n52\tpub struct RebalanceJobId(pub String);\n53\t\n54\timpl RebalanceJobId {\n55\t /// Create a new rebalance job ID for an index.\n56\t pub fn new(index_uid: &str) -> Self {\n57\t Self(format!(\"rebalance:{}\", index_uid))\n58\t }\n59\t\n60\t /// Get the index UID from the job ID.\n61\t pub fn index_uid(&self) -> &str {\n62\t self.0.strip_prefix(\"rebalance:\").unwrap_or(&self.0)\n63\t }\n64\t}\n65\t\n66\t/// Topology change event that triggers rebalancing.\n67\t#[derive(Debug, Clone, Serialize, Deserialize)]\n68\tpub enum TopologyChangeEvent {\n69\t /// A new node was added to a replica group.\n70\t NodeAdded {\n71\t node_id: String,\n72\t replica_group: u32,\n73\t index_uid: String,\n74\t },\n75\t /// A node is being drained (preparing for removal).\n76\t NodeDraining {\n77\t node_id: String,\n78\t replica_group: u32,\n79\t index_uid: String,\n80\t },\n81\t /// A node failed and needs recovery.\n82\t NodeFailed {\n83\t node_id: String,\n84\t replica_group: u32,\n85\t index_uid: String,\n86\t },\n87\t /// A node recovered after failure.\n88\t NodeRecovered {\n89\t node_id: String,\n90\t replica_group: u32,\n91\t index_uid: String,\n92\t },\n93\t}\n94\t\n95\t/// Per-shard migration progress for persistence.\n96\t#[derive(Debug, Clone, Serialize, Deserialize)]\n97\tpub struct ShardMigrationProgress {\n98\t /// Shard ID.\n99\t pub shard_id: u32,\n100\t /// Current phase.\n101\t pub phase: String,\n102\t /// Documents migrated so far.\n103\t pub docs_migrated: u64,\n104\t /// Last offset for pagination resume.\n105\t pub last_offset: u32,\n106\t /// Source node for migration.\n107\t pub source_node: Option,\n108\t /// Target node for migration.\n109\t pub target_node: String,\n110\t}\n111\t\n112\t/// Per-shard migration state for the worker.\n113\t#[derive(Debug, Clone, Serialize, Deserialize)]\n114\tstruct ShardState {\n115\t /// Current phase.\n116\t phase: ShardMigrationPhase,\n117\t /// Documents migrated so far.\n118\t docs_migrated: u64,\n119\t /// Last offset for pagination resume.\n120\t last_offset: u32,\n121\t /// Source node for migration.\n122\t source_node: Option,\n123\t /// Target node for migration.\n124\t target_node: String,\n125\t /// When this shard migration started.\n126\t #[serde(skip, default = \"Instant::now\")]\n127\t started_at: Instant,\n128\t}\n129\t\n130\t/// Migration phases for a single shard.\n131\t#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]\n132\tpub enum ShardMigrationPhase {\n133\t /// Waiting to start.\n134\t Idle,\n135\t /// Dual-write active.\n136\t DualWriteStarted,\n137\t /// Background migration in progress.\n138\t MigrationInProgress,\n139\t /// Migration complete, preparing cutover.\n140\t MigrationComplete,\n141\t /// Dual-write stopped.\n142\t DualWriteStopped,\n143\t /// Old replica deleted.\n144\t OldReplicaDeleted,\n145\t /// Migration failed.\n146\t Failed,\n147\t}\n148\t\n149\t/// State machine for a rebalance job (per index).\n150\t#[derive(Debug, Clone, Serialize, Deserialize)]\n151\tstruct RebalanceJob {\n152\t /// Job ID.\n153\t id: RebalanceJobId,\n154\t /// Index UID being rebalanced.\n155\t index_uid: String,\n156\t /// Replica group being rebalanced.\n157\t replica_group: u32,\n158\t /// Per-shard migration state.\n159\t shards: HashMap,\n160\t /// Job started at.\n161\t #[serde(skip, default = \"Instant::now\")]\n162\t started_at: Instant,\n163\t /// Job completed at (if finished).\n164\t #[serde(skip, default)]\n165\t completed_at: Option,\n166\t /// Total documents migrated.\n167\t total_docs_migrated: u64,\n168\t /// Whether the job is paused.\n169\t paused: bool,\n170\t}\n171\t\n172\t/// Configuration for the rebalancer worker.\n173\t#[derive(Debug, Clone, Serialize, Deserialize)]\n174\tpub struct RebalancerWorkerConfig {\n175\t /// Maximum concurrent migrations (plan §14.2 memory budget).\n176\t pub max_concurrent_migrations: u32,\n177\t /// Leader lease TTL in seconds.\n178\t pub lease_ttl_secs: u64,\n179\t /// Lease renewal interval in milliseconds.\n180\t pub lease_renewal_interval_ms: u64,\n181\t /// Migration batch size.\n182\t pub migration_batch_size: u32,\n183\t /// Delay between migration batches (ms).\n184\t pub migration_batch_delay_ms: u64,\n185\t /// Channel capacity for topology events.\n186\t pub event_channel_capacity: usize,\n187\t}\n188\t\n189\timpl Default for RebalancerWorkerConfig {\n190\t fn default() -> Self {\n191\t Self {\n192\t max_concurrent_migrations: 4,\n193\t lease_ttl_secs: LEASE_TTL_SECS,\n194\t lease_renewal_interval_ms: LEASE_RENEWAL_INTERVAL_MS,\n195\t migration_batch_size: 1000,\n196\t migration_batch_delay_ms: 100,\n197\t event_channel_capacity: 100,\n198\t }\n199\t }\n200\t}\n201\t\n202\t/// The rebalancer background worker.\n203\t///\n204\t/// Runs as a Tokio task, acquires a leader lease, and processes topology\n205\t/// change events to drive shard migrations.\n206\tpub struct RebalancerWorker {\n207\t config: RebalancerWorkerConfig,\n208\t topology: Arc>,\n209\t task_store: Arc,\n210\t _rebalancer: Arc, // Reserved for future use\n211\t migration_coordinator: Arc>,\n212\t migration_executor: Option>,\n213\t metrics: Arc>,\n214\t pod_id: String,\n215\t /// Sender for topology change events.\n216\t event_tx: mpsc::Sender,\n217\t /// Active rebalance jobs (per index).\n218\t jobs: Arc>>,\n219\t /// Receiver for topology change events (cloned for internal use).\n220\t event_rx: Arc>>>,\n221\t /// Callback for recording Prometheus metrics.\n222\t metrics_callback: Option,\n223\t}\n224\t\n225\timpl RebalancerWorker {\n226\t /// Create a new rebalancer worker.\n227\t pub fn new(\n228\t config: RebalancerWorkerConfig,\n229\t topology: Arc>,\n230\t task_store: Arc,\n231\t rebalancer: Arc, // Reserved for future use\n232\t migration_coordinator: Arc>,\n233\t metrics: Arc>,\n234\t pod_id: String,\n235\t ) -> Self {\n236\t Self::with_metrics(config, topology, task_store, rebalancer, migration_coordinator, metrics, pod_id, None)\n237\t }\n238\t\n239\t /// Create a new rebalancer worker with metrics callback.\n240\t pub fn with_metrics(\n241\t config: RebalancerWorkerConfig,\n242\t topology: Arc>,\n243\t task_store: Arc,\n244\t rebalancer: Arc, // Reserved for future use\n245\t migration_coordinator: Arc>,\n246\t metrics: Arc>,\n247\t pod_id: String,\n248\t metrics_callback: Option,\n249\t ) -> Self {\n250\t let (event_tx, event_rx) = mpsc::channel(config.event_channel_capacity);\n251\t\n252\t Self {\n253\t config,\n254\t topology,\n255\t task_store,\n256\t _rebalancer: rebalancer, // Stored but not currently used\n257\t migration_coordinator,\n258\t migration_executor: None, // Set via with_migration_executor\n259\t metrics,\n260\t pod_id,\n261\t event_tx,\n262\t jobs: Arc::new(RwLock::new(HashMap::new())),\n263\t event_rx: Arc::new(RwLock::new(Some(event_rx))),\n264\t metrics_callback,\n265\t }\n266\t }\n267\t\n268\t /// Set the migration executor (provides HTTP client for actual migrations).\n269\t pub fn with_migration_executor(mut self, executor: Arc) -> Self {\n270\t self.migration_executor = Some(executor);\n271\t self\n272\t }\n273\t\n274\t /// Get a sender for topology change events.\n275\t pub fn event_sender(&self) -> mpsc::Sender {\n276\t self.event_tx.clone()\n277\t }\n278\t\n279\t /// Start the background worker.\n280\t ///\n281\t /// This runs in a loop:\n282\t /// 1. Try to acquire leader lease for each index (scope: rebalance:)\n283\t /// 2. If acquired, process events and run migrations\n284\t /// 3. Renew lease periodically\n285\t /// 4. If lease lost, go back to step 1\n286\t pub async fn run(&self) {\n287\t info!(\n288\t pod_id = %self.pod_id,\n289\t \"rebalancer worker starting\"\n290\t );\n291\t\n292\t loop {\n293\t // Try to acquire leader lease for each index we're managing\n294\t let mut leader_scopes = Vec::new();\n295\t\n296\t // Get all active indexes from current jobs and use default scope\n297\t let jobs = self.jobs.read().await;\n298\t let mut index_uids: Vec = jobs.values()\n299\t .map(|j| j.index_uid.clone())\n300\t .collect();\n301\t\n302\t // Always include \"default\" scope for rebalancer operations\n303\t index_uids.push(\"default\".to_string());\n304\t drop(jobs);\n305\t\n306\t // Build scopes for each index: rebalance:\n307\t let scopes: Vec = index_uids\n308\t .into_iter()\n309\t .map(|uid| format!(\"rebalance:{}\", uid))\n310\t .collect();\n311\t\n312\t let mut acquired_any = false;\n313\t for scope in &scopes {\n314\t let now_ms = now_ms();\n315\t let expires_at = now_ms + (self.config.lease_ttl_secs * 1000) as i64;\n316\t\n317\t match tokio::task::spawn_blocking({\n318\t let task_store = self.task_store.clone();\n319\t let scope = scope.clone();\n320\t let pod_id = self.pod_id.clone();\n321\t move || {\n322\t task_store.try_acquire_leader_lease(&scope, &pod_id, expires_at, now_ms)\n323\t }\n324\t })\n325\t .await\n326\t {\n327\t Ok(Ok(true)) => {\n328\t info!(scope = %scope, pod_id = %self.pod_id, \"acquired leader lease\");\n329\t leader_scopes.push(scope.clone());\n330\t acquired_any = true;\n331\t }\n332\t Ok(Ok(false)) => {\n333\t debug!(scope = %scope, \"leader lease already held\");\n334\t }\n335\t Ok(Err(e)) => {\n336\t error!(scope = %scope, error = %e, \"failed to acquire leader lease\");\n337\t }\n338\t Err(e) => {\n339\t error!(scope = %scope, error = %e, \"spawn_blocking task failed\");\n340\t }\n341\t }\n342\t }\n343\t\n344\t if acquired_any {\n345\t // We are the leader - update rebalancer metrics\n346\t {\n347\t let mut metrics = self.metrics.write().await;\n348\t metrics.start_rebalance();\n349\t }\n350\t\n351\t // Call metrics callback for rebalance start\n352\t if let Some(ref callback) = self.metrics_callback {\n353\t callback(true, None, None);\n354\t }\n355\t\n356\t // We are the leader - run the main loop\n357\t if let Err(e) = self.run_leader_loop(&leader_scopes).await {\n358\t error!(error = %e, \"leader loop failed\");\n359\t }\n360\t\n361\t // Clear rebalancer in-progress status on exit\n362\t {\n363\t let mut metrics = self.metrics.write().await;\n364\t metrics.end_rebalance();\n365\t }\n366\t\n367\t // Call metrics callback for rebalance end\n368\t if let Some(ref callback) = self.metrics_callback {\n369\t callback(false, None, None);\n370\t }\n371\t } else {\n372\t // Not the leader - wait before retrying\n373\t tokio::time::sleep(Duration::from_millis(\n374\t self.config.lease_renewal_interval_ms,\n375\t ))\n376\t .await;\n377\t }\n378\t }\n379\t }\n380\t\n381\t /// Run the leader loop: process events, renew lease, drive migrations.\n382\t async fn run_leader_loop(&self, scopes: &[String]) -> Result<(), String> {\n383\t let mut lease_renewal = tokio::time::interval(Duration::from_millis(\n384\t self.config.lease_renewal_interval_ms,\n385\t ));\n386\t\n387\t // Take the receiver out of the Option\n388\t let mut event_rx = {\n389\t let mut rx_guard = self.event_rx.write().await;\n390\t rx_guard.take().ok_or_else(|| \"event receiver already taken\".to_string())?\n391\t };\n392\t\n393\t let result = async {\n394\t loop {\n395\t tokio::select! {\n396\t // Renew lease periodically\n397\t _ = lease_renewal.tick() => {\n398\t for scope in scopes {\n399\t let now_ms = now_ms();\n400\t let expires_at = now_ms + (self.config.lease_ttl_secs * 1000) as i64;\n401\t\n402\t match tokio::task::spawn_blocking({\n403\t let task_store = self.task_store.clone();\n404\t let scope = scope.clone();\n405\t let pod_id = self.pod_id.clone();\n406\t move || {\n407\t task_store.renew_leader_lease(&scope, &pod_id, expires_at)\n408\t }\n409\t })\n410\t .await\n411\t {\n412\t Ok(Ok(true)) => {\n413\t debug!(scope = %scope, \"renewed leader lease\");\n414\t }\n415\t Ok(Ok(false)) => {\n416\t info!(scope = %scope, \"lost leader lease\");\n417\t return Ok::<(), String>(()); // Exit loop, will retry acquisition\n418\t }\n419\t Ok(Err(e)) => {\n420\t error!(scope = %scope, error = %e, \"failed to renew lease\");\n421\t return Err(format!(\"lease renewal failed: {}\", e));\n422\t }\n423\t Err(e) => {\n424\t error!(scope = %scope, error = %e, \"spawn_blocking task failed\");\n425\t return Err(format!(\"lease renewal task failed: {}\", e));\n426\t }\n427\t }\n428\t }\n429\t }\n430\t\n431\t // Process topology change events\n432\t Some(event) = event_rx.recv() => {\n433\t if let Err(e) = self.handle_topology_event(event).await {\n434\t error!(error = %e, \"failed to handle topology event\");\n435\t }\n436\t }\n437\t\n438\t // Drive active migrations\n439\t _ = tokio::time::sleep(Duration::from_millis(100)) => {\n440\t if let Err(e) = self.drive_migrations().await {\n441\t error!(error = %e, \"failed to drive migrations\");\n442\t }\n443\t }\n444\t }\n445\t }\n446\t }.await;\n447\t\n448\t // Put the receiver back for retry logic\n449\t {\n450\t let mut rx_guard = self.event_rx.write().await;\n451\t if rx_guard.is_none() {\n452\t *rx_guard = Some(event_rx);\n453\t }\n454\t }\n455\t\n456\t result\n457\t }\n458\t\n459\t /// Handle a topology change event.\n460\t async fn handle_topology_event(&self, event: TopologyChangeEvent) -> Result<(), String> {\n461\t info!(event = ?event, \"handling topology change event\");\n462\t\n463\t match event {\n464\t TopologyChangeEvent::NodeAdded {\n465\t node_id,\n466\t replica_group,\n467\t index_uid,\n468\t } => {\n469\t self.on_node_added(&node_id, replica_group, &index_uid)\n470\t .await?\n471\t }\n472\t TopologyChangeEvent::NodeDraining {\n473\t node_id,\n474\t replica_group,\n475\t index_uid,\n476\t } => {\n477\t self.on_node_draining(&node_id, replica_group, &index_uid)\n478\t .await?\n479\t }\n480\t TopologyChangeEvent::NodeFailed {\n481\t node_id,\n482\t replica_group,\n483\t index_uid,\n484\t } => {\n485\t self.on_node_failed(&node_id, replica_group, &index_uid)\n486\t .await?\n487\t }\n488\t TopologyChangeEvent::NodeRecovered {\n489\t node_id,\n490\t replica_group,\n491\t index_uid,\n492\t } => {\n493\t self.on_node_recovered(&node_id, replica_group, &index_uid)\n494\t .await?\n495\t }\n496\t }\n497\t\n498\t Ok(())\n499\t }\n500\t\n501\t /// Handle node addition: compute affected shards and create job to track migration.\n502\t async fn on_node_added(\n503\t &self,\n504\t node_id: &str,\n505\t replica_group: u32,\n506\t index_uid: &str,\n507\t ) -> Result<(), String> {\n508\t let job_id = RebalanceJobId::new(index_uid);\n509\t\n510\t // Check if we already have a job for this index\n511\t {\n512\t let jobs = self.jobs.read().await;\n513\t if jobs.contains_key(&job_id) {\n514\t debug!(index_uid = %index_uid, \"rebalance job already exists\");\n515\t return Ok(());\n516\t }\n517\t }\n518\t\n519\t // Compute affected shards using the Phase 1 router\n520\t let affected_shards = self.compute_affected_shards_for_add(node_id, replica_group).await?;\n521\t\n522\t if affected_shards.is_empty() {\n523\t info!(\n524\t node_id = %node_id,\n525\t replica_group = replica_group,\n526\t \"no shards need migration for node addition\"\n527\t );\n528\t return Ok(());\n529\t }\n530\t\n531\t info!(\n532\t node_id = %node_id,\n533\t replica_group = replica_group,\n534\t shard_count = affected_shards.len(),\n535\t \"computed affected shards for node addition\"\n536\t );\n537\t\n538\t // Build migration state: shard -> old owner mapping\n539\t let mut old_owners = HashMap::new();\n540\t let mut shard_states = HashMap::new();\n541\t for (shard_id, source_node) in &affected_shards {\n542\t old_owners.insert(ShardId(*shard_id), topo_to_migration_node_id(source_node));\n543\t shard_states.insert(\n544\t *shard_id,\n545\t ShardState {\n546\t phase: ShardMigrationPhase::Idle,\n547\t docs_migrated: 0,\n548\t last_offset: 0,\n549\t source_node: Some(source_node.to_string()),\n550\t target_node: node_id.to_string(),\n551\t started_at: Instant::now(),\n552\t },\n553\t );\n554\t }\n555\t\n556\t // Create migration in coordinator for state tracking and dual-write\n557\t let migration_id = {\n558\t let mut coordinator = self.migration_coordinator.write().await;\n559\t let new_node = topo_to_migration_node_id(&TopologyNodeId::new(node_id.to_string()));\n560\t coordinator.begin_migration(new_node, replica_group, old_owners)\n561\t .map_err(|e| format!(\"failed to create migration: {}\", e))?\n562\t };\n563\t\n564\t // Start dual-write immediately so the router starts writing to both nodes\n565\t {\n566\t let mut coordinator = self.migration_coordinator.write().await;\n567\t coordinator.begin_dual_write(migration_id)\n568\t .map_err(|e| format!(\"failed to start dual-write: {}\", e))?;\n569\t }\n570\t\n571\t let job = RebalanceJob {\n572\t id: job_id.clone(),\n573\t index_uid: index_uid.to_string(),\n574\t replica_group,\n575\t shards: shard_states,\n576\t started_at: Instant::now(),\n577\t completed_at: None,\n578\t total_docs_migrated: 0,\n579\t paused: false,\n580\t };\n581\t\n582\t // Persist job to task store\n583\t self.persist_job(&job).await?;\n584\t\n585\t // Store in memory\n586\t let mut jobs = self.jobs.write().await;\n587\t jobs.insert(job_id.clone(), job);\n588\t\n589\t info!(\n590\t migration_id = %migration_id,\n591\t shard_count = affected_shards.len(),\n592\t \"created migration for node addition\"\n593\t );\n594\t\n595\t Ok(())\n596\t }\n597\t\n598\t /// Handle node draining: compute destination shards and create job to track migration.\n599\t async fn on_node_draining(\n600\t &self,\n601\t node_id: &str,\n602\t replica_group: u32,\n603\t index_uid: &str,\n604\t ) -> Result<(), String> {\n605\t let job_id = RebalanceJobId::new(index_uid);\n606\t\n607\t // Compute shard destinations\n608\t let shard_destinations = self\n609\t .compute_shard_destinations_for_drain(node_id, replica_group)\n610\t .await?;\n611\t\n612\t if shard_destinations.is_empty() {\n613\t info!(\n614\t node_id = %node_id,\n615\t replica_group = replica_group,\n616\t \"no shards need migration for node drain\"\n617\t );\n618\t return Ok(());\n619\t }\n620\t\n621\t info!(\n622\t node_id = %node_id,\n623\t replica_group = replica_group,\n624\t shard_count = shard_destinations.len(),\n625\t \"computed shard destinations for node drain\"\n626\t );\n627\t\n628\t // Build migration state: shard -> old owner (draining node) mapping\n629\t let mut old_owners = HashMap::new();\n630\t let mut shard_states = HashMap::new();\n631\t for (shard_id, dest_node) in &shard_destinations {\n632\t old_owners.insert(ShardId(*shard_id), topo_to_migration_node_id(&TopologyNodeId::new(node_id.to_string())));\n633\t shard_states.insert(\n634\t *shard_id,\n635\t ShardState {\n636\t phase: ShardMigrationPhase::Idle,\n637\t docs_migrated: 0,\n638\t last_offset: 0,\n639\t source_node: Some(node_id.to_string()),\n640\t target_node: dest_node.to_string(),\n641\t started_at: Instant::now(),\n642\t },\n643\t );\n644\t }\n645\t\n646\t // Create migration in coordinator for state tracking and dual-write\n647\t let migration_id = {\n648\t let mut coordinator = self.migration_coordinator.write().await;\n649\t // For drain, the destination node becomes the \"new\" node in the migration\n650\t if let Some((_, first_dest)) = shard_destinations.first() {\n651\t let new_node = topo_to_migration_node_id(first_dest);\n652\t coordinator.begin_migration(new_node, replica_group, old_owners)\n653\t .map_err(|e| format!(\"failed to create migration: {}\", e))?\n654\t } else {\n655\t return Err(\"no shards to migrate\".to_string());\n656\t }\n657\t };\n658\t\n659\t // Start dual-write immediately\n660\t {\n661\t let mut coordinator = self.migration_coordinator.write().await;\n662\t coordinator.begin_dual_write(migration_id)\n663\t .map_err(|e| format!(\"failed to start dual-write: {}\", e))?;\n664\t }\n665\t\n666\t let job = RebalanceJob {\n667\t id: job_id.clone(),\n668\t index_uid: index_uid.to_string(),\n669\t replica_group,\n670\t shards: shard_states,\n671\t started_at: Instant::now(),\n672\t completed_at: None,\n673\t total_docs_migrated: 0,\n674\t paused: false,\n675\t };\n676\t\n677\t // Persist job to task store\n678\t self.persist_job(&job).await?;\n679\t\n680\t // Store in memory\n681\t let mut jobs = self.jobs.write().await;\n682\t jobs.insert(job_id.clone(), job);\n683\t\n684\t info!(\n685\t migration_id = %migration_id,\n686\t shard_count = shard_destinations.len(),\n687\t \"created migration for node drain\"\n688\t );\n689\t\n690\t Ok(())\n691\t }\n692\t\n693\t /// Handle node failure.\n694\t async fn on_node_failed(\n695\t &self,\n696\t node_id: &str,\n697\t replica_group: u32,\n698\t index_uid: &str,\n699\t ) -> Result<(), String> {\n700\t info!(\n701\t node_id = %node_id,\n702\t replica_group = replica_group,\n703\t index_uid = %index_uid,\n704\t \"handling node failure\"\n705\t );\n706\t\n707\t // Mark node as failed in topology\n708\t let node_id_obj = TopologyNodeId::new(node_id.to_string());\n709\t {\n710\t let mut topo = self.topology.write().await;\n711\t if let Some(node) = topo.node_mut(&node_id_obj) {\n712\t node.status = crate::topology::NodeStatus::Failed;\n713\t }\n714\t }\n715\t\n716\t // TODO: Schedule replication to restore RF if needed\n717\t // For now, just log the failure\n718\t Ok(())\n719\t }\n720\t\n721\t /// Handle node recovery.\n722\t async fn on_node_recovered(\n723\t &self,\n724\t node_id: &str,\n725\t replica_group: u32,\n726\t index_uid: &str,\n727\t ) -> Result<(), String> {\n728\t info!(\n729\t node_id = %node_id,\n730\t replica_group = replica_group,\n731\t index_uid = %index_uid,\n732\t \"handling node recovery\"\n733\t );\n734\t\n735\t // Mark node as active in topology\n736\t let node_id_obj = TopologyNodeId::new(node_id.to_string());\n737\t {\n738\t let mut topo = self.topology.write().await;\n739\t if let Some(node) = topo.node_mut(&node_id_obj) {\n740\t node.status = crate::topology::NodeStatus::Active;\n741\t }\n742\t }\n743\t\n744\t // TODO: If auto_rebalance_on_recovery is enabled, trigger rebalancing\n745\t\n746\t Ok(())\n747\t }\n748\t\n749\t /// Compute which shards are affected by adding a new node.\n750\t /// Returns shard -> source_node mapping for shards that will move.\n751\t async fn compute_affected_shards_for_add(\n752\t &self,\n753\t new_node_id: &str,\n754\t replica_group: u32,\n755\t ) -> Result, String> {\n756\t let topo = self.topology.read().await;\n757\t let new_node_id = TopologyNodeId::new(new_node_id.to_string());\n758\t let rf = topo.rf();\n759\t\n760\t // Find the target group\n761\t let group = topo\n762\t .groups()\n763\t .find(|g| g.id == replica_group)\n764\t .ok_or_else(|| format!(\"replica group {} not found\", replica_group))?;\n765\t\n766\t let existing_nodes: Vec<_> = group.nodes().iter().cloned().collect();\n767\t let mut affected_shards = Vec::new();\n768\t\n769\t // For each shard, check if adding the new node would change the assignment\n770\t for shard_id in 0..topo.shards {\n771\t let old_assignment: Vec<_> =\n772\t assign_shard_in_group(shard_id, &existing_nodes, rf);\n773\t\n774\t // New assignment with the new node included\n775\t let all_nodes: Vec<_> = existing_nodes\n776\t .iter()\n777\t .cloned()\n778\t .chain(std::iter::once(new_node_id.clone()))\n779\t .collect();\n780\t let new_assignment: Vec<_> = assign_shard_in_group(shard_id, &all_nodes, rf);\n781\t\n782\t // Check if the new node is in the new assignment\n783\t if new_assignment.contains(&new_node_id) {\n784\t // This shard moves to the new node\n785\t if let Some(old_owner) = old_assignment.first() {\n786\t affected_shards.push((shard_id, old_owner.clone()));\n787\t }\n788\t }\n789\t }\n790\t\n791\t Ok(affected_shards)\n792\t }\n793\t\n794\t /// Compute where each shard should go when draining a node.\n795\t /// Returns shard -> destination_node mapping.\n796\t async fn compute_shard_destinations_for_drain(\n797\t &self,\n798\t drain_node_id: &str,\n799\t replica_group: u32,\n800\t ) -> Result, String> {\n801\t let topo = self.topology.read().await;\n802\t let drain_node_id = TopologyNodeId::new(drain_node_id.to_string());\n803\t let rf = topo.rf();\n804\t\n805\t // Find the target group\n806\t let group = topo\n807\t .groups()\n808\t .find(|g| g.id == replica_group)\n809\t .ok_or_else(|| format!(\"replica group {} not found\", replica_group))?;\n810\t\n811\t let other_nodes: Vec<_> = group\n812\t .nodes()\n813\t .iter()\n814\t .filter(|n| **n != drain_node_id)\n815\t .cloned()\n816\t .collect();\n817\t\n818\t if other_nodes.is_empty() {\n819\t return Err(\"cannot remove last node in group\".to_string());\n820\t }\n821\t\n822\t let mut destinations = Vec::new();\n823\t\n824\t // For each shard, find a new owner among the remaining nodes\n825\t for shard_id in 0..topo.shards {\n826\t let assignment: Vec<_> = assign_shard_in_group(shard_id, group.nodes(), rf);\n827\t\n828\t if assignment.contains(&drain_node_id) {\n829\t // This shard needs a new home\n830\t let mut best_node = None;\n831\t let mut best_score = 0u64;\n832\t\n833\t for node in &other_nodes {\n834\t let s = crate::router::score(shard_id, node.as_str());\n835\t if s > best_score {\n836\t best_score = s;\n837\t best_node = Some(node.clone());\n838\t }\n839\t }\n840\t\n841\t if let Some(dest) = best_node {\n842\t destinations.push((shard_id, dest));\n843\t }\n844\t }\n845\t }\n846\t\n847\t Ok(destinations)\n848\t }\n849\t\n850\t /// Drive active migrations forward.\n851\t async fn drive_migrations(&self) -> Result<(), String> {\n852\t let jobs = self.jobs.read().await;\n853\t let mut active_jobs = Vec::new();\n854\t\n855\t for (job_id, job) in jobs.iter() {\n856\t if job.paused || job.completed_at.is_some() {\n857\t continue;\n858\t }\n859\t\n860\t // Count how many shards are actively migrating\n861\t let migrating_count = job\n862\t .shards\n863\t .values()\n864\t .filter(|s| {\n865\t matches!(\n866\t s.phase,\n867\t ShardMigrationPhase::MigrationInProgress\n868\t | ShardMigrationPhase::DualWriteStarted\n869\t )\n870\t })\n871\t .count();\n872\t\n873\t if migrating_count < self.config.max_concurrent_migrations as usize {\n874\t active_jobs.push((job_id.clone(), job.clone()));\n875\t }\n876\t }\n877\t\n878\t // Drop read lock before processing\n879\t drop(jobs);\n880\t\n881\t // Process up to max_concurrent_migrations jobs\n882\t for (job_id, job) in active_jobs\n883\t .into_iter()\n884\t .take(self.config.max_concurrent_migrations as usize)\n885\t {\n886\t if let Err(e) = self.process_job(&job_id).await {\n887\t error!(job_id = %job_id.0, error = %e, \"failed to process job\");\n888\t }\n889\t }\n890\t\n891\t Ok(())\n892\t }\n893\t\n894\t /// Emit Prometheus metrics for the current rebalancer state.\n895\t pub async fn emit_metrics(&self) {\n896\t let jobs = self.jobs.read().await;\n897\t\n898\t // Calculate total documents migrated across all jobs\n899\t let total_docs: u64 = jobs.values()\n900\t .map(|j| j.total_docs_migrated)\n901\t .sum();\n902\t\n903\t // Check if any rebalance is in progress\n904\t let in_progress = jobs.values().any(|j| j.completed_at.is_none() && !j.paused);\n905\t\n906\t drop(jobs);\n907\t\n908\t // Update internal metrics\n909\t {\n910\t let mut metrics = self.metrics.write().await;\n911\t if in_progress {\n912\t metrics.start_rebalance();\n913\t } else {\n914\t metrics.end_rebalance();\n915\t }\n916\t // Note: documents_migrated_total is already tracked in RebalancerMetrics\n917\t // and synced to Prometheus via the health checker\n918\t let _ = total_docs;\n919\t }\n920\t\n921\t // Call metrics callback for rebalance status\n922\t if let Some(ref callback) = self.metrics_callback {\n923\t callback(in_progress, None, None);\n924\t }\n925\t }\n926\t\n927\t /// Get the current rebalancer status for monitoring.\n928\t pub async fn get_status(&self) -> RebalancerWorkerStatus {\n929\t let jobs = self.jobs.read().await;\n930\t\n931\t let active_jobs = jobs.values()\n932\t .filter(|j| j.completed_at.is_none() && !j.paused)\n933\t .count();\n934\t\n935\t let completed_jobs = jobs.values()\n936\t .filter(|j| j.completed_at.is_some())\n937\t .count();\n938\t\n939\t let paused_jobs = jobs.values()\n940\t .filter(|j| j.paused)\n941\t .count();\n942\t\n943\t let total_shards: usize = jobs.values()\n944\t .map(|j| j.shards.len())\n945\t .sum();\n946\t\n947\t let completed_shards: usize = jobs.values()\n948\t .map(|j| j.shards.values().filter(|s| s.phase == ShardMigrationPhase::OldReplicaDeleted).count())\n949\t .sum();\n950\t\n951\t RebalancerWorkerStatus {\n952\t active_jobs,\n953\t completed_jobs,\n954\t paused_jobs,\n955\t total_shards,\n956\t completed_shards,\n957\t }\n958\t }\n959\t\n960\t /// Process a single rebalance job.\n961\t ///\n962\t /// Drives the migration state machine forward for each shard in the job.\n963\t /// This is the core method that advances migrations through their phases.\n964\t async fn process_job(&self, job_id: &RebalanceJobId) -> Result<(), String> {\n965\t // Get job (cloned to avoid holding lock)\n966\t let job = {\n967\t let jobs = self.jobs.read().await;\n968\t jobs.get(job_id).cloned()\n969\t };\n970\t\n971\t let mut job = match job {\n972\t Some(j) => j,\n973\t None => return Ok(()), // Job may have been removed\n974\t };\n975\t\n976\t // Skip paused or completed jobs\n977\t if job.paused || job.completed_at.is_some() {\n978\t return Ok(());\n979\t }\n980\t\n981\t // Sync worker job state with MigrationCoordinator state\n982\t // This ensures we resume from the correct phase after a pod restart\n983\t self.sync_job_with_coordinator(&mut job).await?;\n984\t\n985\t // Get the migration from the coordinator for this job\n986\t let migration_id = {\n987\t let coordinator = self.migration_coordinator.read().await;\n988\t let mut found_id = None;\n989\t for (mid, state) in coordinator.get_all_migrations() {\n990\t // Match by index_uid and replica_group\n991\t if state.replica_group == job.replica_group {\n992\t found_id = Some(*mid);\n993\t break;\n994\t }\n995\t }\n996\t found_id.ok_or_else(|| \"no migration found for this job\".to_string())?\n997\t };\n998\t\n999\t // Get migration state to access node addresses\n1000\t let (new_node, old_owners) = {\n1001\t let coordinator = self.migration_coordinator.read().await;\n1002\t let state = coordinator.get_state(migration_id)\n1003\t .ok_or_else(|| \"migration state not found\".to_string())?;\n1004\t (state.new_node.clone(), state.old_owners.clone())\n1005\t };\n1006\t\n1007\t // Get node addresses from topology\n1008\t let (new_node_address, old_owner_addresses) = {\n1009\t let topo = self.topology.read().await;\n1010\t let new_addr = topo.node(&migration_to_topo_node_id(&new_node))\n1011\t .ok_or_else(|| format!(\"new node not found: {}\", new_node.0))?\n1012\t .address.clone();\n1013\t\n1014\t let mut old_addrs = HashMap::new();\n1015\t for (shard, old_node) in &old_owners {\n1016\t if let Some(node) = topo.node(&migration_to_topo_node_id(old_node)) {\n1017\t old_addrs.insert(*shard, node.address.clone());\n1018\t }\n1019\t }\n1020\t\n1021\t (new_addr, old_addrs)\n1022\t };\n1023\t\n1024\t // Use a default index for now - in production, this would come from config\n1025\t let index_uid = \"default\".to_string();\n1026\t\n1027\t // Drive migrations forward for each shard\n1028\t let mut updated = false;\n1029\t let mut total_docs_migrated = 0u64;\n1030\t\n1031\t // Limit concurrent migrations to stay within memory budget\n1032\t let mut active_count = 0;\n1033\t\n1034\t for (&shard_id, shard_state) in job.shards.iter_mut() {\n1035\t // Check concurrent migration limit\n1036\t if active_count >= self.config.max_concurrent_migrations as usize {\n1037\t break;\n1038\t }\n1039\t\n1040\t match shard_state.phase {\n1041\t ShardMigrationPhase::Idle => {\n1042\t // Already started dual-write in on_node_added/on_node_draining\n1043\t shard_state.phase = ShardMigrationPhase::DualWriteStarted;\n1044\t updated = true;\n1045\t }\n1046\t ShardMigrationPhase::DualWriteStarted => {\n1047\t // Start background migration\n1048\t if let Some(ref executor) = self.migration_executor {\n1049\t if let Some(old_address) = old_owner_addresses.get(&ShardId(shard_id)) {\n1050\t let old_node = old_owners.get(&ShardId(shard_id))\n1051\t .cloned()\n1052\t .unwrap_or_else(|| crate::migration::NodeId(\"unknown\".to_string()));\n1053\t if let Err(e) = self.execute_background_migration(\n1054\t executor,\n1055\t migration_id,\n1056\t shard_id,\n1057\t &old_node,\n1058\t old_address,\n1059\t &new_node.0,\n1060\t &new_node_address,\n1061\t &index_uid,\n1062\t ).await {\n1063\t error!(shard_id, error = %e, \"failed to execute background migration\");\n1064\t shard_state.phase = ShardMigrationPhase::Failed;\n1065\t } else {\n1066\t shard_state.phase = ShardMigrationPhase::MigrationInProgress;\n1067\t active_count += 1;\n1068\t updated = true;\n1069\t }\n1070\t }\n1071\t } else {\n1072\t // No executor - skip directly to complete for testing\n1073\t shard_state.docs_migrated = 1000; // Simulated\n1074\t shard_state.phase = ShardMigrationPhase::MigrationComplete;\n1075\t updated = true;\n1076\t }\n1077\t }\n1078\t ShardMigrationPhase::MigrationInProgress => {\n1079\t // Check if migration is complete by querying the coordinator\n1080\t let complete = self.check_migration_complete_for_shard(shard_id).await?;\n1081\t if complete {\n1082\t shard_state.phase = ShardMigrationPhase::MigrationComplete;\n1083\t active_count -= 1; // One less active migration\n1084\t updated = true;\n1085\t }\n1086\t }\n1087\t ShardMigrationPhase::MigrationComplete => {\n1088\t // Begin cutover sequence\n1089\t if let Err(e) = self.begin_cutover_for_shard(shard_id).await {\n1090\t error!(shard_id, error = %e, \"failed to begin cutover\");\n1091\t } else {\n1092\t shard_state.phase = ShardMigrationPhase::DualWriteStopped;\n1093\t updated = true;\n1094\t }\n1095\t }\n1096\t ShardMigrationPhase::DualWriteStopped => {\n1097\t // Complete cutover and delete old replica\n1098\t if let Err(e) = self.complete_cutover_for_shard(shard_id).await {\n1099\t error!(shard_id, error = %e, \"failed to complete cutover\");\n1100\t } else {\n1101\t shard_state.phase = ShardMigrationPhase::OldReplicaDeleted;\n1102\t updated = true;\n1103\t }\n1104\t }\n1105\t ShardMigrationPhase::OldReplicaDeleted => {\n1106\t // Migration complete for this shard\n1107\t }\n1108\t ShardMigrationPhase::Failed => {\n1109\t // Migration failed - skip this shard\n1110\t }\n1111\t }\n1112\t\n1113\t total_docs_migrated += shard_state.docs_migrated;\n1114\t }\n1115\t\n1116\t // Update total docs migrated for the job\n1117\t job.total_docs_migrated = total_docs_migrated;\n1118\t\n1119\t // Update metrics\n1120\t {\n1121\t let mut metrics = self.metrics.write().await;\n1122\t metrics.record_documents_migrated(total_docs_migrated);\n1123\t }\n1124\t\n1125\t // Call metrics callback for documents migrated\n1126\t if let Some(ref callback) = self.metrics_callback {\n1127\t callback(false, Some(total_docs_migrated), None);\n1128\t }\n1129\t\n1130\t // Check if job is complete (all shards in final state)\n1131\t let all_complete = job.shards.values().all(|s| {\n1132\t matches!(s.phase, ShardMigrationPhase::OldReplicaDeleted | ShardMigrationPhase::Failed)\n1133\t });\n1134\t\n1135\t if all_complete && job.completed_at.is_none() {\n1136\t job.completed_at = Some(Instant::now());\n1137\t\n1138\t // Record final duration metric\n1139\t let duration = job.started_at.elapsed().as_secs_f64();\n1140\t {\n1141\t let mut metrics = self.metrics.write().await;\n1142\t metrics.end_rebalance();\n1143\t info!(\n1144\t job_id = %job_id.0,\n1145\t duration_secs = duration,\n1146\t \"rebalance job completed\"\n1147\t );\n1148\t }\n1149\t\n1150\t // Call metrics callback for rebalance completion with duration\n1151\t if let Some(ref callback) = self.metrics_callback {\n1152\t callback(false, None, Some(duration));\n1153\t }\n1154\t\n1155\t // Update job in memory\n1156\t let mut jobs = self.jobs.write().await;\n1157\t jobs.insert(job_id.clone(), job.clone());\n1158\t\n1159\t // Persist to task store\n1160\t self.persist_job(&job).await?;\n1161\t\n1162\t // Persist progress for each shard\n1163\t for shard_id in job.shards.keys() {\n1164\t self.persist_job_progress(&job, *shard_id).await?;\n1165\t }\n1166\t }\n1167\t\n1168\t Ok(())\n1169\t }\n1170\t\n1171\t /// Persist a job to the task store.\n1172\t async fn persist_job(&self, job: &RebalanceJob) -> Result<(), String> {\n1173\t let progress = serde_json::to_string(job)\n1174\t .map_err(|e| format!(\"failed to serialize job: {}\", e))?;\n1175\t\n1176\t let new_job = NewJob {\n1177\t id: job.id.0.clone(),\n1178\t type_: \"rebalance\".to_string(),\n1179\t params: progress,\n1180\t state: if job.completed_at.is_some() {\n1181\t \"completed\".to_string()\n1182\t } else if job.paused {\n1183\t \"paused\".to_string()\n1184\t } else {\n1185\t \"running\".to_string()\n1186\t },\n1187\t progress: format!(\n1188\t \"{{\\\"total_shards\\\":{},\\\"completed\\\":{},\\\"docs_migrated\\\":{}}}\",\n1189\t job.shards.len(),\n1190\t job.shards\n1191\t .values()\n1192\t .filter(|s| s.phase == ShardMigrationPhase::OldReplicaDeleted)\n1193\t .count(),\n1194\t job.total_docs_migrated\n1195\t ),\n1196\t };\n1197\t\n1198\t tokio::task::spawn_blocking({\n1199\t let task_store = self.task_store.clone();\n1200\t let new_job = new_job.clone();\n1201\t move || {\n1202\t task_store.insert_job(&new_job)\n1203\t }\n1204\t })\n1205\t .await\n1206\t .map_err(|e| format!(\"failed to persist job: {}\", e))?\n1207\t .map_err(|e| format!(\"failed to persist job: {}\", e))?;\n1208\t\n1209\t Ok(())\n1210\t }\n1211\t\n1212\t /// Persist progress for a single shard.\n1213\t async fn persist_job_progress(\n1214\t &self,\n1215\t job: &RebalanceJob,\n1216\t shard_id: u32,\n1217\t ) -> Result<(), String> {\n1218\t if let Some(shard_state) = job.shards.get(&shard_id) {\n1219\t let progress = ShardMigrationProgress {\n1220\t shard_id,\n1221\t phase: format!(\"{:?}\", shard_state.phase),\n1222\t docs_migrated: shard_state.docs_migrated,\n1223\t last_offset: shard_state.last_offset,\n1224\t source_node: shard_state.source_node.clone(),\n1225\t target_node: shard_state.target_node.clone(),\n1226\t };\n1227\t\n1228\t let progress_json =\n1229\t serde_json::to_string(&progress)\n1230\t .map_err(|e| format!(\"failed to serialize progress: {}\", e))?;\n1231\t\n1232\t // Update job progress in task store\n1233\t tokio::task::spawn_blocking({\n1234\t let task_store = self.task_store.clone();\n1235\t let job_id = job.id.0.clone();\n1236\t let completed_at = format!(\"{:?}\", job.completed_at.is_some());\n1237\t let progress_json = progress_json.clone();\n1238\t move || {\n1239\t task_store.update_job_progress(&job_id, &completed_at, &progress_json)\n1240\t }\n1241\t })\n1242\t .await\n1243\t .map_err(|e| format!(\"failed to update job progress: {}\", e))?\n1244\t .map_err(|e| format!(\"failed to update job progress: {}\", e))?;\n1245\t }\n1246\t\n1247\t Ok(())\n1248\t }\n1249\t\n1250\t /// Sync worker job state with MigrationCoordinator state.\n1251\t ///\n1252\t /// This ensures that after a pod restart, the worker's job state reflects\n1253\t /// the actual migration state tracked by the coordinator.\n1254\t async fn sync_job_with_coordinator(&self, job: &mut RebalanceJob) -> Result<(), String> {\n1255\t let coordinator = self.migration_coordinator.read().await;\n1256\t\n1257\t // For each shard in the job, check if there's a corresponding migration\n1258\t // in the coordinator and sync the state\n1259\t for (&shard_id, shard_state) in job.shards.iter_mut() {\n1260\t let shard = ShardId(shard_id);\n1261\t\n1262\t // Look for a migration in the coordinator that affects this shard\n1263\t for (_mid, migration_state) in coordinator.get_all_migrations() {\n1264\t if let Some(migration_shard_state) = migration_state.affected_shards.get(&shard) {\n1265\t // Sync the phase based on the migration coordinator state\n1266\t use crate::migration::ShardMigrationState as CoordinatorState;\n1267\t shard_state.phase = match migration_shard_state {\n1268\t CoordinatorState::Pending => ShardMigrationPhase::Idle,\n1269\t CoordinatorState::Migrating { .. } => ShardMigrationPhase::MigrationInProgress,\n1270\t CoordinatorState::MigrationComplete { docs_copied } => {\n1271\t shard_state.docs_migrated = *docs_copied;\n1272\t ShardMigrationPhase::MigrationComplete\n1273\t }\n1274\t CoordinatorState::Draining { .. } => ShardMigrationPhase::DualWriteStopped,\n1275\t CoordinatorState::DeltaPass { docs_copied, delta_docs_copied } => {\n1276\t shard_state.docs_migrated = docs_copied + delta_docs_copied;\n1277\t ShardMigrationPhase::DualWriteStopped\n1278\t }\n1279\t CoordinatorState::Active => ShardMigrationPhase::OldReplicaDeleted,\n1280\t CoordinatorState::Failed { .. } => ShardMigrationPhase::Failed,\n1281\t };\n1282\t }\n1283\t }\n1284\t }\n1285\t\n1286\t Ok(())\n1287\t }\n1288\t\n1289\t /// Start dual-write phase for a shard.\n1290\t async fn start_dual_write_for_shard(&self, _replica_group: u32, shard_id: u32) -> Result<(), String> {\n1291\t let shard = ShardId(shard_id);\n1292\t let mut coordinator = self.migration_coordinator.write().await;\n1293\t\n1294\t // Find or create the migration for this shard\n1295\t // For now, we'll create a new migration if one doesn't exist\n1296\t // In production, this would be created when the job is created\n1297\t\n1298\t info!(\n1299\t shard_id,\n1300\t \"starting dual-write phase\"\n1301\t );\n1302\t\n1303\t // The dual-write is handled by the router checking is_dual_write_active\n1304\t // We just need to ensure the migration coordinator knows about this shard\n1305\t Ok(())\n1306\t }\n1307\t\n1308\t /// Begin cutover sequence for a shard.\n1309\t async fn begin_cutover_for_shard(&self, shard_id: u32) -> Result<(), String> {\n1310\t info!(\n1311\t shard_id,\n1312\t \"beginning cutover sequence\"\n1313\t );\n1314\t\n1315\t let shard = ShardId(shard_id);\n1316\t let mut coordinator = self.migration_coordinator.write().await;\n1317\t\n1318\t // Collect the migrations that affect this shard first\n1319\t let migrations_to_cutover: Vec<_> = coordinator.get_all_migrations()\n1320\t .iter()\n1321\t .filter(|(_, migration_state)| migration_state.affected_shards.contains_key(&shard))\n1322\t .map(|(mid, _)| *mid)\n1323\t .collect();\n1324\t\n1325\t // Now perform the cutover\n1326\t for mid in migrations_to_cutover {\n1327\t coordinator.begin_cutover(mid).map_err(|e| e.to_string())?;\n1328\t break; // Only need to cutover one migration per shard\n1329\t }\n1330\t\n1331\t Ok(())\n1332\t }\n1333\t\n1334\t /// Complete cutover and delete old replica for a shard.\n1335\t async fn complete_cutover_for_shard(&self, shard_id: u32) -> Result<(), String> {\n1336\t info!(\n1337\t shard_id,\n1338\t \"completing cutover and deleting old replica\"\n1339\t );\n1340\t\n1341\t let shard = ShardId(shard_id);\n1342\t let mut coordinator = self.migration_coordinator.write().await;\n1343\t\n1344\t // Collect the migrations that affect this shard first\n1345\t let migrations_to_complete: Vec<_> = coordinator.get_all_migrations()\n1346\t .iter()\n1347\t .filter(|(_, migration_state)| migration_state.affected_shards.contains_key(&shard))\n1348\t .map(|(mid, _)| *mid)\n1349\t .collect();\n1350\t\n1351\t // Now complete the cleanup\n1352\t for mid in migrations_to_complete {\n1353\t coordinator.complete_drain(mid).map_err(|e| e.to_string())?;\n1354\t coordinator.complete_cleanup(mid).map_err(|e| e.to_string())?;\n1355\t break; // Only need to complete one migration per shard\n1356\t }\n1357\t\n1358\t Ok(())\n1359\t }\n1360\t\n1361\t /// Start background migration for a shard.\n1362\t async fn start_background_migration_for_shard(&self, shard_id: u32) -> Result<(), String> {\n1363\t info!(\n1364\t shard_id,\n1365\t \"starting background migration\"\n1366\t );\n1367\t\n1368\t // The actual migration is handled by the Rebalancer component's migration executor\n1369\t // This method just signals that we're ready for background migration to proceed\n1370\t Ok(())\n1371\t }\n1372\t\n1373\t /// Check if migration is complete for a shard.\n1374\t async fn check_migration_complete_for_shard(&self, shard_id: u32) -> Result {\n1375\t let shard = ShardId(shard_id);\n1376\t let coordinator = self.migration_coordinator.read().await;\n1377\t\n1378\t // Check if the migration coordinator has marked this shard as complete\n1379\t for (_mid, migration_state) in coordinator.get_all_migrations() {\n1380\t if let Some(shard_state) = migration_state.affected_shards.get(&shard) {\n1381\t use crate::migration::ShardMigrationState as CoordinatorState;\n1382\t if matches!(shard_state, CoordinatorState::MigrationComplete { .. }) {\n1383\t return Ok(true);\n1384\t }\n1385\t }\n1386\t }\n1387\t\n1388\t Ok(false)\n1389\t }\n1390\t\n1391\t /// Execute background migration for a shard.\n1392\t ///\n1393\t /// This performs the actual document migration from source to target node\n1394\t /// using pagination to stay within memory bounds.\n1395\t async fn execute_background_migration(\n1396\t &self,\n1397\t executor: &Arc,\n1398\t migration_id: MigrationId,\n1399\t shard_id: u32,\n1400\t old_node_id: &MigrationNodeId,\n1401\t old_address: &str,\n1402\t new_node_id: &str,\n1403\t new_address: &str,\n1404\t index_uid: &str,\n1405\t ) -> Result<(), String> {\n1406\t info!(\n1407\t migration_id = %migration_id,\n1408\t shard_id,\n1409\t from = %old_node_id.0,\n1410\t to = %new_node_id,\n1411\t \"starting shard migration\"\n1412\t );\n1413\t\n1414\t // Paginate through all documents for this shard\n1415\t let mut offset = 0u32;\n1416\t let limit = self.config.migration_batch_size;\n1417\t let mut total_docs_copied = 0u64;\n1418\t\n1419\t loop {\n1420\t // Fetch documents from source\n1421\t let (docs, _total) = executor.fetch_documents(\n1422\t &old_node_id.0,\n1423\t old_address,\n1424\t index_uid,\n1425\t shard_id,\n1426\t limit,\n1427\t offset,\n1428\t ).await.map_err(|e| format!(\"fetch failed: {}\", e))?;\n1429\t\n1430\t if docs.is_empty() {\n1431\t break; // No more documents\n1432\t }\n1433\t\n1434\t // Write documents to target\n1435\t executor.write_documents(\n1436\t new_node_id,\n1437\t new_address,\n1438\t index_uid,\n1439\t docs.clone(),\n1440\t ).await.map_err(|e| format!(\"write failed: {}\", e))?;\n1441\t\n1442\t total_docs_copied += docs.len() as u64;\n1443\t offset += limit;\n1444\t\n1445\t // Throttle if configured\n1446\t if self.config.migration_batch_delay_ms > 0 {\n1447\t tokio::time::sleep(Duration::from_millis(\n1448\t self.config.migration_batch_delay_ms,\n1449\t ))\n1450\t .await;\n1451\t }\n1452\t }\n1453\t\n1454\t // Mark shard migration complete in coordinator\n1455\t {\n1456\t let mut coordinator = self.migration_coordinator.write().await;\n1457\t coordinator.shard_migration_complete(migration_id, ShardId(shard_id), total_docs_copied)\n1458\t .map_err(|e| format!(\"failed to mark shard complete: {}\", e))?;\n1459\t }\n1460\t\n1461\t // Update metrics\n1462\t {\n1463\t let mut metrics = self.metrics.write().await;\n1464\t metrics.record_documents_migrated(total_docs_copied);\n1465\t }\n1466\t\n1467\t // Call metrics callback for documents migrated\n1468\t if let Some(ref callback) = self.metrics_callback {\n1469\t callback(false, Some(total_docs_copied), None);\n1470\t }\n1471\t\n1472\t info!(\n1473\t migration_id = %migration_id,\n1474\t shard_id,\n1475\t docs_copied = total_docs_copied,\n1476\t \"shard migration complete\"\n1477\t );\n1478\t\n1479\t Ok(())\n1480\t }\n1481\t\n1482\t /// Pause an in-progress rebalance.\n1483\t\n1484\t /// Pause an in-progress rebalance.\n1485\t pub async fn pause_rebalance(&self, index_uid: &str) -> Result<(), String> {\n1486\t let job_id = RebalanceJobId::new(index_uid);\n1487\t let mut jobs = self.jobs.write().await;\n1488\t\n1489\t if let Some(job) = jobs.get_mut(&job_id) {\n1490\t job.paused = true;\n1491\t info!(index_uid = %index_uid, \"paused rebalance\");\n1492\t Ok(())\n1493\t } else {\n1494\t Err(format!(\"no rebalance job found for index {}\", index_uid))\n1495\t }\n1496\t }\n1497\t\n1498\t /// Resume a paused rebalance.\n1499\t pub async fn resume_rebalance(&self, index_uid: &str) -> Result<(), String> {\n1500\t let job_id = RebalanceJobId::new(index_uid);\n1501\t let mut jobs = self.jobs.write().await;\n1502\t\n1503\t if let Some(job) = jobs.get_mut(&job_id) {\n1504\t job.paused = false;\n1505\t info!(index_uid = %index_uid, \"resumed rebalance\");\n1506\t Ok(())\n1507\t } else {\n1508\t Err(format!(\"no rebalance job found for index {}\", index_uid))\n1509\t }\n1510\t }\n1511\t\n1512\t /// Load persisted jobs from task store on startup.\n1513\t pub async fn load_persisted_jobs(&self) -> Result<(), String> {\n1514\t let jobs = tokio::task::spawn_blocking({\n1515\t let task_store = self.task_store.clone();\n1516\t move || {\n1517\t task_store.list_jobs_by_state(\"running\")\n1518\t }\n1519\t })\n1520\t .await\n1521\t .map_err(|e| format!(\"failed to list jobs: {}\", e))?\n1522\t .map_err(|e| format!(\"failed to list jobs: {}\", e))?;\n1523\t\n1524\t for job_row in jobs {\n1525\t if job_row.type_ == \"rebalance\" {\n1526\t if let Ok(job) = serde_json::from_str::(&job_row.params) {\n1527\t info!(\n1528\t index_uid = %job.index_uid,\n1529\t \"loaded persisted rebalance job\"\n1530\t );\n1531\t let mut jobs = self.jobs.write().await;\n1532\t jobs.insert(job.id.clone(), job);\n1533\t }\n1534\t }\n1535\t }\n1536\t\n1537\t Ok(())\n1538\t }\n1539\t}\n1540\t\n1541\t/// Status of the rebalancer worker for monitoring.\n1542\t#[derive(Debug, Clone, Serialize, Deserialize)]\n1543\tpub struct RebalancerWorkerStatus {\n1544\t /// Number of active rebalance jobs.\n1545\t pub active_jobs: usize,\n1546\t /// Number of completed rebalance jobs.\n1547\t pub completed_jobs: usize,\n1548\t /// Number of paused rebalance jobs.\n1549\t pub paused_jobs: usize,\n1550\t /// Total number of shards across all jobs.\n1551\t pub total_shards: usize,\n1552\t /// Number of completed shard migrations.\n1553\t pub completed_shards: usize,\n1554\t}\n1555\t\n1556\t/// Get current time in milliseconds since Unix epoch.\n1557\tfn now_ms() -> i64 {\n1558\t std::time::SystemTime::now()\n1559\t .duration_since(std::time::UNIX_EPOCH)\n1560\t .unwrap_or_default()\n1561\t .as_millis() as i64\n1562\t}\n1563\t\n1564\t/// Convert a topology NodeId to a migration NodeId.\n1565\tfn topo_to_migration_node_id(id: &TopologyNodeId) -> MigrationNodeId {\n1566\t crate::migration::NodeId(id.as_str().to_string())\n1567\t}\n1568\t\n1569\t/// Convert a migration NodeId to a topology NodeId.\n1570\tfn migration_to_topo_node_id(id: &MigrationNodeId) -> TopologyNodeId {\n1571\t TopologyNodeId::new(id.0.clone())\n1572\t}\n1573\t\n1574\t/// Get the old node owner for a specific shard.\n1575\tfn old_node_owners_for_shard(old_owners: &HashMap, shard_id: u32) -> MigrationNodeId {\n1576\t old_owners.get(&ShardId(shard_id))\n1577\t .cloned()\n1578\t .unwrap_or_else(|| crate::migration::NodeId(\"unknown\".to_string()))\n1579\t}\n1580\t\n1581\t#[cfg(test)]\n1582\tmod tests {\n1583\t use super::*;\n1584\t use crate::config::MiroirConfig;\n1585\t use crate::migration::MigrationConfig;\n1586\t use crate::topology::Node;\n1587\t use std::sync::Arc;\n1588\t\n1589\t fn test_topology() -> Topology {\n1590\t let mut topo = Topology::new(64, 2, 2);\n1591\t topo.add_node(Node::new(\n1592\t TopologyNodeId::new(\"node-0\".into()),\n1593\t \"http://node-0:7700\".into(),\n1594\t 0,\n1595\t ));\n1596\t topo.add_node(Node::new(\n1597\t TopologyNodeId::new(\"node-1\".into()),\n1598\t \"http://node-1:7700\".into(),\n1599\t 0,\n1600\t ));\n1601\t topo.add_node(Node::new(\n1602\t TopologyNodeId::new(\"node-2\".into()),\n1603\t \"http://node-2:7700\".into(),\n1604\t 1,\n1605\t ));\n1606\t topo.add_node(Node::new(\n1607\t TopologyNodeId::new(\"node-3\".into()),\n1608\t \"http://node-3:7700\".into(),\n1609\t 1,\n1610\t ));\n1611\t topo\n1612\t }\n1613\t\n1614\t #[test]\n1615\t fn test_rebalance_job_id() {\n1616\t let job_id = RebalanceJobId::new(\"test-index\");\n1617\t assert_eq!(job_id.0, \"rebalance:test-index\");\n1618\t assert_eq!(job_id.index_uid(), \"test-index\");\n1619\t }\n1620\t\n1621\t #[test]\n1622\t fn test_worker_config_default() {\n1623\t let config = RebalancerWorkerConfig::default();\n1624\t assert_eq!(config.max_concurrent_migrations, 4);\n1625\t assert_eq!(config.lease_ttl_secs, LEASE_TTL_SECS);\n1626\t assert_eq!(config.lease_renewal_interval_ms, LEASE_RENEWAL_INTERVAL_MS);\n1627\t }\n1628\t\n1629\t #[tokio::test]\n1630\t async fn test_compute_affected_shards_for_add() {\n1631\t let topo = Arc::new(RwLock::new(test_topology()));\n1632\t let config = RebalancerWorkerConfig::default();\n1633\t\n1634\t // Create a mock task store (in-memory for testing)\n1635\t // Note: This would need a proper mock TaskStore implementation\n1636\t // For now, we'll skip the full integration test\n1637\t\n1638\t // Test that adding a node to group 0 affects some shards\n1639\t let new_node_id = \"node-new\";\n1640\t let replica_group = 0;\n1641\t\n1642\t // We'd need to instantiate the worker with a proper mock task store\n1643\t // This is a placeholder for the actual test\n1644\t }\n1645\t\n1646\t #[test]\n1647\t fn test_shard_migration_phase_serialization() {\n1648\t let phase = ShardMigrationPhase::MigrationInProgress;\n1649\t let json = serde_json::to_string(&phase).unwrap();\n1650\t assert!(json.contains(\"MigrationInProgress\"));\n1651\t\n1652\t let deserialized: ShardMigrationPhase = serde_json::from_str(&json).unwrap();\n1653\t assert_eq!(deserialized, phase);\n1654\t }\n1655\t\n1656\t #[test]\n1657\t fn test_topology_event_serialization() {\n1658\t let event = TopologyChangeEvent::NodeAdded {\n1659\t node_id: \"node-4\".to_string(),\n1660\t replica_group: 0,\n1661\t index_uid: \"test\".to_string(),\n1662\t };\n1663\t\n1664\t let json = serde_json::to_string(&event).unwrap();\n1665\t assert!(json.contains(\"NodeAdded\"));\n1666\t\n1667\t let deserialized: TopologyChangeEvent = serde_json::from_str(&json).unwrap();\n1668\t match deserialized {\n1669\t TopologyChangeEvent::NodeAdded {\n1670\t node_id,\n1671\t replica_group,\n1672\t index_uid,\n1673\t } => {\n1674\t assert_eq!(node_id, \"node-4\");\n1675\t assert_eq!(replica_group, 0);\n1676\t assert_eq!(index_uid, \"test\");\n1677\t }\n1678\t _ => panic!(\"wrong event type\"),\n1679\t }\n1680\t }\n1681\t}\n1682\t"}]},"parent_tool_use_id":null,"session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"7e91d989-0e87-46d1-8215-3ce3f2111836","timestamp":"2026-05-23T06:38:34.438Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/crates/miroir-core/src/rebalancer_worker/mod.rs","content":"//! Rebalancer background worker with advisory lock.\n//!\n//! Implements plan §4 \"Rebalancer\" background task:\n//! - Advisory lock via leader_lease (only one pod runs the rebalancer)\n//! - Reacts to topology change events (node add/drain/fail/recover)\n//! - Computes affected shards using the Phase 1 router\n//! - Drives the migration state machine for each affected shard\n//! - Updates Prometheus metrics (plan §10)\n//! - Progress persistence via jobs table for resumability\n\nmod drift_reconciler;\n\n#[cfg(test)]\nmod acceptance_tests;\n\n#[cfg(test)]\nmod settings_broadcast_acceptance_tests;\n\npub use drift_reconciler::{DriftReconciler, DriftReconcilerConfig};\n\nuse crate::migration::{MigrationCoordinator, MigrationId, MigrationNodeId, ShardId};\nuse crate::rebalancer::{MigrationExecutor, Rebalancer, RebalancerMetrics};\nuse crate::router::assign_shard_in_group;\nuse crate::task_store::{NewJob, TaskStore};\nuse crate::topology::{NodeId as TopologyNodeId, Topology};\nuse serde::{Deserialize, Serialize};\nuse std::collections::HashMap;\nuse std::sync::Arc;\nuse std::time::{Duration, Instant};\nuse tokio::sync::{mpsc, RwLock};\nuse tracing::{debug, error, info};\n\n/// Callback type for recording rebalancer metrics.\n///\n/// Called when:\n/// - Documents are migrated (count)\n/// - Rebalance starts (in_progress = true)\n/// - Rebalance ends (in_progress = false, duration_secs)\npub type RebalancerMetricsCallback = Arc, Option) + Send + Sync>;\n\n/// Default leader lease TTL in seconds.\nconst LEASE_TTL_SECS: u64 = 10;\n\n/// Default interval for lease renewal checks.\nconst LEASE_RENEWAL_INTERVAL_MS: u64 = 2000;\n\n/// Maximum time to wait for a migration job to complete.\nconst MIGRATION_TIMEOUT_SECS: u64 = 3600;\n\n/// Unique identifier for a rebalance job (per index).\n#[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]\npub struct RebalanceJobId(pub String);\n\nimpl RebalanceJobId {\n /// Create a new rebalance job ID for an index.\n pub fn new(index_uid: &str) -> Self {\n Self(format!(\"rebalance:{}\", index_uid))\n }\n\n /// Get the index UID from the job ID.\n pub fn index_uid(&self) -> &str {\n self.0.strip_prefix(\"rebalance:\").unwrap_or(&self.0)\n }\n}\n\n/// Topology change event that triggers rebalancing.\n#[derive(Debug, Clone, Serialize, Deserialize)]\npub enum TopologyChangeEvent {\n /// A new node was added to a replica group.\n NodeAdded {\n node_id: String,\n replica_group: u32,\n index_uid: String,\n },\n /// A node is being drained (preparing for removal).\n NodeDraining {\n node_id: String,\n replica_group: u32,\n index_uid: String,\n },\n /// A node failed and needs recovery.\n NodeFailed {\n node_id: String,\n replica_group: u32,\n index_uid: String,\n },\n /// A node recovered after failure.\n NodeRecovered {\n node_id: String,\n replica_group: u32,\n index_uid: String,\n },\n}\n\n/// Per-shard migration progress for persistence.\n#[derive(Debug, Clone, Serialize, Deserialize)]\npub struct ShardMigrationProgress {\n /// Shard ID.\n pub shard_id: u32,\n /// Current phase.\n pub phase: String,\n /// Documents migrated so far.\n pub docs_migrated: u64,\n /// Last offset for pagination resume.\n pub last_offset: u32,\n /// Source node for migration.\n pub source_node: Option,\n /// Target node for migration.\n pub target_node: String,\n}\n\n/// Per-shard migration state for the worker.\n#[derive(Debug, Clone, Serialize, Deserialize)]\nstruct ShardState {\n /// Current phase.\n phase: ShardMigrationPhase,\n /// Documents migrated so far.\n docs_migrated: u64,\n /// Last offset for pagination resume.\n last_offset: u32,\n /// Source node for migration.\n source_node: Option,\n /// Target node for migration.\n target_node: String,\n /// When this shard migration started.\n #[serde(skip, default = \"Instant::now\")]\n started_at: Instant,\n}\n\n/// Migration phases for a single shard.\n#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]\npub enum ShardMigrationPhase {\n /// Waiting to start.\n Idle,\n /// Dual-write active.\n DualWriteStarted,\n /// Background migration in progress.\n MigrationInProgress,\n /// Migration complete, preparing cutover.\n MigrationComplete,\n /// Dual-write stopped.\n DualWriteStopped,\n /// Old replica deleted.\n OldReplicaDeleted,\n /// Migration failed.\n Failed,\n}\n\n/// State machine for a rebalance job (per index).\n#[derive(Debug, Clone, Serialize, Deserialize)]\nstruct RebalanceJob {\n /// Job ID.\n id: RebalanceJobId,\n /// Index UID being rebalanced.\n index_uid: String,\n /// Replica group being rebalanced.\n replica_group: u32,\n /// Per-shard migration state.\n shards: HashMap,\n /// Job started at.\n #[serde(skip, default = \"Instant::now\")]\n started_at: Instant,\n /// Job completed at (if finished).\n #[serde(skip, default)]\n completed_at: Option,\n /// Total documents migrated.\n total_docs_migrated: u64,\n /// Whether the job is paused.\n paused: bool,\n}\n\n/// Configuration for the rebalancer worker.\n#[derive(Debug, Clone, Serialize, Deserialize)]\npub struct RebalancerWorkerConfig {\n /// Maximum concurrent migrations (plan §14.2 memory budget).\n pub max_concurrent_migrations: u32,\n /// Leader lease TTL in seconds.\n pub lease_ttl_secs: u64,\n /// Lease renewal interval in milliseconds.\n pub lease_renewal_interval_ms: u64,\n /// Migration batch size.\n pub migration_batch_size: u32,\n /// Delay between migration batches (ms).\n pub migration_batch_delay_ms: u64,\n /// Channel capacity for topology events.\n pub event_channel_capacity: usize,\n}\n\nimpl Default for RebalancerWorkerConfig {\n fn default() -> Self {\n Self {\n max_concurrent_migrations: 4,\n lease_ttl_secs: LEASE_TTL_SECS,\n lease_renewal_interval_ms: LEASE_RENEWAL_INTERVAL_MS,\n migration_batch_size: 1000,\n migration_batch_delay_ms: 100,\n event_channel_capacity: 100,\n }\n }\n}\n\n/// The rebalancer background worker.\n///\n/// Runs as a Tokio task, acquires a leader lease, and processes topology\n/// change events to drive shard migrations.\npub struct RebalancerWorker {\n config: RebalancerWorkerConfig,\n topology: Arc>,\n task_store: Arc,\n _rebalancer: Arc, // Reserved for future use\n migration_coordinator: Arc>,\n migration_executor: Option>,\n metrics: Arc>,\n pod_id: String,\n /// Sender for topology change events.\n event_tx: mpsc::Sender,\n /// Active rebalance jobs (per index).\n jobs: Arc>>,\n /// Receiver for topology change events (cloned for internal use).\n event_rx: Arc>>>,\n /// Callback for recording Prometheus metrics.\n metrics_callback: Option,\n}\n\nimpl RebalancerWorker {\n /// Create a new rebalancer worker.\n pub fn new(\n config: RebalancerWorkerConfig,\n topology: Arc>,\n task_store: Arc,\n rebalancer: Arc, // Reserved for future use\n migration_coordinator: Arc>,\n metrics: Arc>,\n pod_id: String,\n ) -> Self {\n Self::with_metrics(config, topology, task_store, rebalancer, migration_coordinator, metrics, pod_id, None)\n }\n\n /// Create a new rebalancer worker with metrics callback.\n pub fn with_metrics(\n config: RebalancerWorkerConfig,\n topology: Arc>,\n task_store: Arc,\n rebalancer: Arc, // Reserved for future use\n migration_coordinator: Arc>,\n metrics: Arc>,\n pod_id: String,\n metrics_callback: Option,\n ) -> Self {\n let (event_tx, event_rx) = mpsc::channel(config.event_channel_capacity);\n\n Self {\n config,\n topology,\n task_store,\n _rebalancer: rebalancer, // Stored but not currently used\n migration_coordinator,\n migration_executor: None, // Set via with_migration_executor\n metrics,\n pod_id,\n event_tx,\n jobs: Arc::new(RwLock::new(HashMap::new())),\n event_rx: Arc::new(RwLock::new(Some(event_rx))),\n metrics_callback,\n }\n }\n\n /// Set the migration executor (provides HTTP client for actual migrations).\n pub fn with_migration_executor(mut self, executor: Arc) -> Self {\n self.migration_executor = Some(executor);\n self\n }\n\n /// Get a sender for topology change events.\n pub fn event_sender(&self) -> mpsc::Sender {\n self.event_tx.clone()\n }\n\n /// Start the background worker.\n ///\n /// This runs in a loop:\n /// 1. Try to acquire leader lease for each index (scope: rebalance:)\n /// 2. If acquired, process events and run migrations\n /// 3. Renew lease periodically\n /// 4. If lease lost, go back to step 1\n pub async fn run(&self) {\n info!(\n pod_id = %self.pod_id,\n \"rebalancer worker starting\"\n );\n\n loop {\n // Try to acquire leader lease for each index we're managing\n let mut leader_scopes = Vec::new();\n\n // Get all active indexes from current jobs and use default scope\n let jobs = self.jobs.read().await;\n let mut index_uids: Vec = jobs.values()\n .map(|j| j.index_uid.clone())\n .collect();\n\n // Always include \"default\" scope for rebalancer operations\n index_uids.push(\"default\".to_string());\n drop(jobs);\n\n // Build scopes for each index: rebalance:\n let scopes: Vec = index_uids\n .into_iter()\n .map(|uid| format!(\"rebalance:{}\", uid))\n .collect();\n\n let mut acquired_any = false;\n for scope in &scopes {\n let now_ms = now_ms();\n let expires_at = now_ms + (self.config.lease_ttl_secs * 1000) as i64;\n\n match tokio::task::spawn_blocking({\n let task_store = self.task_store.clone();\n let scope = scope.clone();\n let pod_id = self.pod_id.clone();\n move || {\n task_store.try_acquire_leader_lease(&scope, &pod_id, expires_at, now_ms)\n }\n })\n .await\n {\n Ok(Ok(true)) => {\n info!(scope = %scope, pod_id = %self.pod_id, \"acquired leader lease\");\n leader_scopes.push(scope.clone());\n acquired_any = true;\n }\n Ok(Ok(false)) => {\n debug!(scope = %scope, \"leader lease already held\");\n }\n Ok(Err(e)) => {\n error!(scope = %scope, error = %e, \"failed to acquire leader lease\");\n }\n Err(e) => {\n error!(scope = %scope, error = %e, \"spawn_blocking task failed\");\n }\n }\n }\n\n if acquired_any {\n // We are the leader - update rebalancer metrics\n {\n let mut metrics = self.metrics.write().await;\n metrics.start_rebalance();\n }\n\n // Call metrics callback for rebalance start\n if let Some(ref callback) = self.metrics_callback {\n callback(true, None, None);\n }\n\n // We are the leader - run the main loop\n if let Err(e) = self.run_leader_loop(&leader_scopes).await {\n error!(error = %e, \"leader loop failed\");\n }\n\n // Clear rebalancer in-progress status on exit\n {\n let mut metrics = self.metrics.write().await;\n metrics.end_rebalance();\n }\n\n // Call metrics callback for rebalance end\n if let Some(ref callback) = self.metrics_callback {\n callback(false, None, None);\n }\n } else {\n // Not the leader - wait before retrying\n tokio::time::sleep(Duration::from_millis(\n self.config.lease_renewal_interval_ms,\n ))\n .await;\n }\n }\n }\n\n /// Run the leader loop: process events, renew lease, drive migrations.\n async fn run_leader_loop(&self, scopes: &[String]) -> Result<(), String> {\n let mut lease_renewal = tokio::time::interval(Duration::from_millis(\n self.config.lease_renewal_interval_ms,\n ));\n\n // Take the receiver out of the Option\n let mut event_rx = {\n let mut rx_guard = self.event_rx.write().await;\n rx_guard.take().ok_or_else(|| \"event receiver already taken\".to_string())?\n };\n\n let result = async {\n loop {\n tokio::select! {\n // Renew lease periodically\n _ = lease_renewal.tick() => {\n for scope in scopes {\n let now_ms = now_ms();\n let expires_at = now_ms + (self.config.lease_ttl_secs * 1000) as i64;\n\n match tokio::task::spawn_blocking({\n let task_store = self.task_store.clone();\n let scope = scope.clone();\n let pod_id = self.pod_id.clone();\n move || {\n task_store.renew_leader_lease(&scope, &pod_id, expires_at)\n }\n })\n .await\n {\n Ok(Ok(true)) => {\n debug!(scope = %scope, \"renewed leader lease\");\n }\n Ok(Ok(false)) => {\n info!(scope = %scope, \"lost leader lease\");\n return Ok::<(), String>(()); // Exit loop, will retry acquisition\n }\n Ok(Err(e)) => {\n error!(scope = %scope, error = %e, \"failed to renew lease\");\n return Err(format!(\"lease renewal failed: {}\", e));\n }\n Err(e) => {\n error!(scope = %scope, error = %e, \"spawn_blocking task failed\");\n return Err(format!(\"lease renewal task failed: {}\", e));\n }\n }\n }\n }\n\n // Process topology change events\n Some(event) = event_rx.recv() => {\n if let Err(e) = self.handle_topology_event(event).await {\n error!(error = %e, \"failed to handle topology event\");\n }\n }\n\n // Drive active migrations\n _ = tokio::time::sleep(Duration::from_millis(100)) => {\n if let Err(e) = self.drive_migrations().await {\n error!(error = %e, \"failed to drive migrations\");\n }\n }\n }\n }\n }.await;\n\n // Put the receiver back for retry logic\n {\n let mut rx_guard = self.event_rx.write().await;\n if rx_guard.is_none() {\n *rx_guard = Some(event_rx);\n }\n }\n\n result\n }\n\n /// Handle a topology change event.\n async fn handle_topology_event(&self, event: TopologyChangeEvent) -> Result<(), String> {\n info!(event = ?event, \"handling topology change event\");\n\n match event {\n TopologyChangeEvent::NodeAdded {\n node_id,\n replica_group,\n index_uid,\n } => {\n self.on_node_added(&node_id, replica_group, &index_uid)\n .await?\n }\n TopologyChangeEvent::NodeDraining {\n node_id,\n replica_group,\n index_uid,\n } => {\n self.on_node_draining(&node_id, replica_group, &index_uid)\n .await?\n }\n TopologyChangeEvent::NodeFailed {\n node_id,\n replica_group,\n index_uid,\n } => {\n self.on_node_failed(&node_id, replica_group, &index_uid)\n .await?\n }\n TopologyChangeEvent::NodeRecovered {\n node_id,\n replica_group,\n index_uid,\n } => {\n self.on_node_recovered(&node_id, replica_group, &index_uid)\n .await?\n }\n }\n\n Ok(())\n }\n\n /// Handle node addition: compute affected shards and create job to track migration.\n async fn on_node_added(\n &self,\n node_id: &str,\n replica_group: u32,\n index_uid: &str,\n ) -> Result<(), String> {\n let job_id = RebalanceJobId::new(index_uid);\n\n // Check if we already have a job for this index\n {\n let jobs = self.jobs.read().await;\n if jobs.contains_key(&job_id) {\n debug!(index_uid = %index_uid, \"rebalance job already exists\");\n return Ok(());\n }\n }\n\n // Compute affected shards using the Phase 1 router\n let affected_shards = self.compute_affected_shards_for_add(node_id, replica_group).await?;\n\n if affected_shards.is_empty() {\n info!(\n node_id = %node_id,\n replica_group = replica_group,\n \"no shards need migration for node addition\"\n );\n return Ok(());\n }\n\n info!(\n node_id = %node_id,\n replica_group = replica_group,\n shard_count = affected_shards.len(),\n \"computed affected shards for node addition\"\n );\n\n // Build migration state: shard -> old owner mapping\n let mut old_owners = HashMap::new();\n let mut shard_states = HashMap::new();\n for (shard_id, source_node) in &affected_shards {\n old_owners.insert(ShardId(*shard_id), topo_to_migration_node_id(source_node));\n shard_states.insert(\n *shard_id,\n ShardState {\n phase: ShardMigrationPhase::Idle,\n docs_migrated: 0,\n last_offset: 0,\n source_node: Some(source_node.to_string()),\n target_node: node_id.to_string(),\n started_at: Instant::now(),\n },\n );\n }\n\n // Create migration in coordinator for state tracking and dual-write\n let migration_id = {\n let mut coordinator = self.migration_coordinator.write().await;\n let new_node = topo_to_migration_node_id(&TopologyNodeId::new(node_id.to_string()));\n coordinator.begin_migration(new_node, replica_group, old_owners)\n .map_err(|e| format!(\"failed to create migration: {}\", e))?\n };\n\n // Start dual-write immediately so the router starts writing to both nodes\n {\n let mut coordinator = self.migration_coordinator.write().await;\n coordinator.begin_dual_write(migration_id)\n .map_err(|e| format!(\"failed to start dual-write: {}\", e))?;\n }\n\n let job = RebalanceJob {\n id: job_id.clone(),\n index_uid: index_uid.to_string(),\n replica_group,\n shards: shard_states,\n started_at: Instant::now(),\n completed_at: None,\n total_docs_migrated: 0,\n paused: false,\n };\n\n // Persist job to task store\n self.persist_job(&job).await?;\n\n // Store in memory\n let mut jobs = self.jobs.write().await;\n jobs.insert(job_id.clone(), job);\n\n info!(\n migration_id = %migration_id,\n shard_count = affected_shards.len(),\n \"created migration for node addition\"\n );\n\n Ok(())\n }\n\n /// Handle node draining: compute destination shards and create job to track migration.\n async fn on_node_draining(\n &self,\n node_id: &str,\n replica_group: u32,\n index_uid: &str,\n ) -> Result<(), String> {\n let job_id = RebalanceJobId::new(index_uid);\n\n // Compute shard destinations\n let shard_destinations = self\n .compute_shard_destinations_for_drain(node_id, replica_group)\n .await?;\n\n if shard_destinations.is_empty() {\n info!(\n node_id = %node_id,\n replica_group = replica_group,\n \"no shards need migration for node drain\"\n );\n return Ok(());\n }\n\n info!(\n node_id = %node_id,\n replica_group = replica_group,\n shard_count = shard_destinations.len(),\n \"computed shard destinations for node drain\"\n );\n\n // Build migration state: shard -> old owner (draining node) mapping\n let mut old_owners = HashMap::new();\n let mut shard_states = HashMap::new();\n for (shard_id, dest_node) in &shard_destinations {\n old_owners.insert(ShardId(*shard_id), topo_to_migration_node_id(&TopologyNodeId::new(node_id.to_string())));\n shard_states.insert(\n *shard_id,\n ShardState {\n phase: ShardMigrationPhase::Idle,\n docs_migrated: 0,\n last_offset: 0,\n source_node: Some(node_id.to_string()),\n target_node: dest_node.to_string(),\n started_at: Instant::now(),\n },\n );\n }\n\n // Create migration in coordinator for state tracking and dual-write\n let migration_id = {\n let mut coordinator = self.migration_coordinator.write().await;\n // For drain, the destination node becomes the \"new\" node in the migration\n if let Some((_, first_dest)) = shard_destinations.first() {\n let new_node = topo_to_migration_node_id(first_dest);\n coordinator.begin_migration(new_node, replica_group, old_owners)\n .map_err(|e| format!(\"failed to create migration: {}\", e))?\n } else {\n return Err(\"no shards to migrate\".to_string());\n }\n };\n\n // Start dual-write immediately\n {\n let mut coordinator = self.migration_coordinator.write().await;\n coordinator.begin_dual_write(migration_id)\n .map_err(|e| format!(\"failed to start dual-write: {}\", e))?;\n }\n\n let job = RebalanceJob {\n id: job_id.clone(),\n index_uid: index_uid.to_string(),\n replica_group,\n shards: shard_states,\n started_at: Instant::now(),\n completed_at: None,\n total_docs_migrated: 0,\n paused: false,\n };\n\n // Persist job to task store\n self.persist_job(&job).await?;\n\n // Store in memory\n let mut jobs = self.jobs.write().await;\n jobs.insert(job_id.clone(), job);\n\n info!(\n migration_id = %migration_id,\n shard_count = shard_destinations.len(),\n \"created migration for node drain\"\n );\n\n Ok(())\n }\n\n /// Handle node failure.\n async fn on_node_failed(\n &self,\n node_id: &str,\n replica_group: u32,\n index_uid: &str,\n ) -> Result<(), String> {\n info!(\n node_id = %node_id,\n replica_group = replica_group,\n index_uid = %index_uid,\n \"handling node failure\"\n );\n\n // Mark node as failed in topology\n let node_id_obj = TopologyNodeId::new(node_id.to_string());\n {\n let mut topo = self.topology.write().await;\n if let Some(node) = topo.node_mut(&node_id_obj) {\n node.status = crate::topology::NodeStatus::Failed;\n }\n }\n\n // TODO: Schedule replication to restore RF if needed\n // For now, just log the failure\n Ok(())\n }\n\n /// Handle node recovery.\n async fn on_node_recovered(\n &self,\n node_id: &str,\n replica_group: u32,\n index_uid: &str,\n ) -> Result<(), String> {\n info!(\n node_id = %node_id,\n replica_group = replica_group,\n index_uid = %index_uid,\n \"handling node recovery\"\n );\n\n // Mark node as active in topology\n let node_id_obj = TopologyNodeId::new(node_id.to_string());\n {\n let mut topo = self.topology.write().await;\n if let Some(node) = topo.node_mut(&node_id_obj) {\n node.status = crate::topology::NodeStatus::Active;\n }\n }\n\n // TODO: If auto_rebalance_on_recovery is enabled, trigger rebalancing\n\n Ok(())\n }\n\n /// Compute which shards are affected by adding a new node.\n /// Returns shard -> source_node mapping for shards that will move.\n async fn compute_affected_shards_for_add(\n &self,\n new_node_id: &str,\n replica_group: u32,\n ) -> Result, String> {\n let topo = self.topology.read().await;\n let new_node_id = TopologyNodeId::new(new_node_id.to_string());\n let rf = topo.rf();\n\n // Find the target group\n let group = topo\n .groups()\n .find(|g| g.id == replica_group)\n .ok_or_else(|| format!(\"replica group {} not found\", replica_group))?;\n\n let existing_nodes: Vec<_> = group.nodes().iter().cloned().collect();\n let mut affected_shards = Vec::new();\n\n // For each shard, check if adding the new node would change the assignment\n for shard_id in 0..topo.shards {\n let old_assignment: Vec<_> =\n assign_shard_in_group(shard_id, &existing_nodes, rf);\n\n // New assignment with the new node included\n let all_nodes: Vec<_> = existing_nodes\n .iter()\n .cloned()\n .chain(std::iter::once(new_node_id.clone()))\n .collect();\n let new_assignment: Vec<_> = assign_shard_in_group(shard_id, &all_nodes, rf);\n\n // Check if the new node is in the new assignment\n if new_assignment.contains(&new_node_id) {\n // This shard moves to the new node\n if let Some(old_owner) = old_assignment.first() {\n affected_shards.push((shard_id, old_owner.clone()));\n }\n }\n }\n\n Ok(affected_shards)\n }\n\n /// Compute where each shard should go when draining a node.\n /// Returns shard -> destination_node mapping.\n async fn compute_shard_destinations_for_drain(\n &self,\n drain_node_id: &str,\n replica_group: u32,\n ) -> Result, String> {\n let topo = self.topology.read().await;\n let drain_node_id = TopologyNodeId::new(drain_node_id.to_string());\n let rf = topo.rf();\n\n // Find the target group\n let group = topo\n .groups()\n .find(|g| g.id == replica_group)\n .ok_or_else(|| format!(\"replica group {} not found\", replica_group))?;\n\n let other_nodes: Vec<_> = group\n .nodes()\n .iter()\n .filter(|n| **n != drain_node_id)\n .cloned()\n .collect();\n\n if other_nodes.is_empty() {\n return Err(\"cannot remove last node in group\".to_string());\n }\n\n let mut destinations = Vec::new();\n\n // For each shard, find a new owner among the remaining nodes\n for shard_id in 0..topo.shards {\n let assignment: Vec<_> = assign_shard_in_group(shard_id, group.nodes(), rf);\n\n if assignment.contains(&drain_node_id) {\n // This shard needs a new home\n let mut best_node = None;\n let mut best_score = 0u64;\n\n for node in &other_nodes {\n let s = crate::router::score(shard_id, node.as_str());\n if s > best_score {\n best_score = s;\n best_node = Some(node.clone());\n }\n }\n\n if let Some(dest) = best_node {\n destinations.push((shard_id, dest));\n }\n }\n }\n\n Ok(destinations)\n }\n\n /// Drive active migrations forward.\n async fn drive_migrations(&self) -> Result<(), String> {\n let jobs = self.jobs.read().await;\n let mut active_jobs = Vec::new();\n\n for (job_id, job) in jobs.iter() {\n if job.paused || job.completed_at.is_some() {\n continue;\n }\n\n // Count how many shards are actively migrating\n let migrating_count = job\n .shards\n .values()\n .filter(|s| {\n matches!(\n s.phase,\n ShardMigrationPhase::MigrationInProgress\n | ShardMigrationPhase::DualWriteStarted\n )\n })\n .count();\n\n if migrating_count < self.config.max_concurrent_migrations as usize {\n active_jobs.push((job_id.clone(), job.clone()));\n }\n }\n\n // Drop read lock before processing\n drop(jobs);\n\n // Process up to max_concurrent_migrations jobs\n for (job_id, job) in active_jobs\n .into_iter()\n .take(self.config.max_concurrent_migrations as usize)\n {\n if let Err(e) = self.process_job(&job_id).await {\n error!(job_id = %job_id.0, error = %e, \"failed to process job\");\n }\n }\n\n Ok(())\n }\n\n /// Emit Prometheus metrics for the current rebalancer state.\n pub async fn emit_metrics(&self) {\n let jobs = self.jobs.read().await;\n\n // Calculate total documents migrated across all jobs\n let total_docs: u64 = jobs.values()\n .map(|j| j.total_docs_migrated)\n .sum();\n\n // Check if any rebalance is in progress\n let in_progress = jobs.values().any(|j| j.completed_at.is_none() && !j.paused);\n\n drop(jobs);\n\n // Update internal metrics\n {\n let mut metrics = self.metrics.write().await;\n if in_progress {\n metrics.start_rebalance();\n } else {\n metrics.end_rebalance();\n }\n // Note: documents_migrated_total is already tracked in RebalancerMetrics\n // and synced to Prometheus via the health checker\n let _ = total_docs;\n }\n\n // Call metrics callback for rebalance status\n if let Some(ref callback) = self.metrics_callback {\n callback(in_progress, None, None);\n }\n }\n\n /// Get the current rebalancer status for monitoring.\n pub async fn get_status(&self) -> RebalancerWorkerStatus {\n let jobs = self.jobs.read().await;\n\n let active_jobs = jobs.values()\n .filter(|j| j.completed_at.is_none() && !j.paused)\n .count();\n\n let completed_jobs = jobs.values()\n .filter(|j| j.completed_at.is_some())\n .count();\n\n let paused_jobs = jobs.values()\n .filter(|j| j.paused)\n .count();\n\n let total_shards: usize = jobs.values()\n .map(|j| j.shards.len())\n .sum();\n\n let completed_shards: usize = jobs.values()\n .map(|j| j.shards.values().filter(|s| s.phase == ShardMigrationPhase::OldReplicaDeleted).count())\n .sum();\n\n RebalancerWorkerStatus {\n active_jobs,\n completed_jobs,\n paused_jobs,\n total_shards,\n completed_shards,\n }\n }\n\n /// Process a single rebalance job.\n ///\n /// Drives the migration state machine forward for each shard in the job.\n /// This is the core method that advances migrations through their phases.\n async fn process_job(&self, job_id: &RebalanceJobId) -> Result<(), String> {\n // Get job (cloned to avoid holding lock)\n let job = {\n let jobs = self.jobs.read().await;\n jobs.get(job_id).cloned()\n };\n\n let mut job = match job {\n Some(j) => j,\n None => return Ok(()), // Job may have been removed\n };\n\n // Skip paused or completed jobs\n if job.paused || job.completed_at.is_some() {\n return Ok(());\n }\n\n // Sync worker job state with MigrationCoordinator state\n // This ensures we resume from the correct phase after a pod restart\n self.sync_job_with_coordinator(&mut job).await?;\n\n // Get the migration from the coordinator for this job\n let migration_id = {\n let coordinator = self.migration_coordinator.read().await;\n let mut found_id = None;\n for (mid, state) in coordinator.get_all_migrations() {\n // Match by index_uid and replica_group\n if state.replica_group == job.replica_group {\n found_id = Some(*mid);\n break;\n }\n }\n found_id.ok_or_else(|| \"no migration found for this job\".to_string())?\n };\n\n // Get migration state to access node addresses\n let (new_node, old_owners) = {\n let coordinator = self.migration_coordinator.read().await;\n let state = coordinator.get_state(migration_id)\n .ok_or_else(|| \"migration state not found\".to_string())?;\n (state.new_node.clone(), state.old_owners.clone())\n };\n\n // Get node addresses from topology\n let (new_node_address, old_owner_addresses) = {\n let topo = self.topology.read().await;\n let new_addr = topo.node(&migration_to_topo_node_id(&new_node))\n .ok_or_else(|| format!(\"new node not found: {}\", new_node.0))?\n .address.clone();\n\n let mut old_addrs = HashMap::new();\n for (shard, old_node) in &old_owners {\n if let Some(node) = topo.node(&migration_to_topo_node_id(old_node)) {\n old_addrs.insert(*shard, node.address.clone());\n }\n }\n\n (new_addr, old_addrs)\n };\n\n // Use a default index for now - in production, this would come from config\n let index_uid = \"default\".to_string();\n\n // Drive migrations forward for each shard\n let mut updated = false;\n let mut total_docs_migrated = 0u64;\n\n // Limit concurrent migrations to stay within memory budget\n let mut active_count = 0;\n\n for (&shard_id, shard_state) in job.shards.iter_mut() {\n // Check concurrent migration limit\n if active_count >= self.config.max_concurrent_migrations as usize {\n break;\n }\n\n match shard_state.phase {\n ShardMigrationPhase::Idle => {\n // Already started dual-write in on_node_added/on_node_draining\n shard_state.phase = ShardMigrationPhase::DualWriteStarted;\n updated = true;\n }\n ShardMigrationPhase::DualWriteStarted => {\n // Start background migration\n if let Some(ref executor) = self.migration_executor {\n if let Some(old_address) = old_owner_addresses.get(&ShardId(shard_id)) {\n let old_node = old_owners.get(&ShardId(shard_id))\n .cloned()\n .unwrap_or_else(|| crate::migration::NodeId(\"unknown\".to_string()));\n if let Err(e) = self.execute_background_migration(\n executor,\n migration_id,\n shard_id,\n &old_node,\n old_address,\n &new_node.0,\n &new_node_address,\n &index_uid,\n ).await {\n error!(shard_id, error = %e, \"failed to execute background migration\");\n shard_state.phase = ShardMigrationPhase::Failed;\n } else {\n shard_state.phase = ShardMigrationPhase::MigrationInProgress;\n active_count += 1;\n updated = true;\n }\n }\n } else {\n // No executor - skip directly to complete for testing\n shard_state.docs_migrated = 1000; // Simulated\n shard_state.phase = ShardMigrationPhase::MigrationComplete;\n updated = true;\n }\n }\n ShardMigrationPhase::MigrationInProgress => {\n // Check if migration is complete by querying the coordinator\n let complete = self.check_migration_complete_for_shard(shard_id).await?;\n if complete {\n shard_state.phase = ShardMigrationPhase::MigrationComplete;\n active_count -= 1; // One less active migration\n updated = true;\n }\n }\n ShardMigrationPhase::MigrationComplete => {\n // Begin cutover sequence\n if let Err(e) = self.begin_cutover_for_shard(shard_id).await {\n error!(shard_id, error = %e, \"failed to begin cutover\");\n } else {\n shard_state.phase = ShardMigrationPhase::DualWriteStopped;\n updated = true;\n }\n }\n ShardMigrationPhase::DualWriteStopped => {\n // Complete cutover and delete old replica\n if let Err(e) = self.complete_cutover_for_shard(shard_id).await {\n error!(shard_id, error = %e, \"failed to complete cutover\");\n } else {\n shard_state.phase = ShardMigrationPhase::OldReplicaDeleted;\n updated = true;\n }\n }\n ShardMigrationPhase::OldReplicaDeleted => {\n // Migration complete for this shard\n }\n ShardMigrationPhase::Failed => {\n // Migration failed - skip this shard\n }\n }\n\n total_docs_migrated += shard_state.docs_migrated;\n }\n\n // Update total docs migrated for the job\n job.total_docs_migrated = total_docs_migrated;\n\n // Update metrics\n {\n let mut metrics = self.metrics.write().await;\n metrics.record_documents_migrated(total_docs_migrated);\n }\n\n // Call metrics callback for documents migrated\n if let Some(ref callback) = self.metrics_callback {\n callback(false, Some(total_docs_migrated), None);\n }\n\n // Check if job is complete (all shards in final state)\n let all_complete = job.shards.values().all(|s| {\n matches!(s.phase, ShardMigrationPhase::OldReplicaDeleted | ShardMigrationPhase::Failed)\n });\n\n if all_complete && job.completed_at.is_none() {\n job.completed_at = Some(Instant::now());\n\n // Record final duration metric\n let duration = job.started_at.elapsed().as_secs_f64();\n {\n let mut metrics = self.metrics.write().await;\n metrics.end_rebalance();\n info!(\n job_id = %job_id.0,\n duration_secs = duration,\n \"rebalance job completed\"\n );\n }\n\n // Call metrics callback for rebalance completion with duration\n if let Some(ref callback) = self.metrics_callback {\n callback(false, None, Some(duration));\n }\n\n // Update job in memory\n let mut jobs = self.jobs.write().await;\n jobs.insert(job_id.clone(), job.clone());\n\n // Persist to task store\n self.persist_job(&job).await?;\n\n // Persist progress for each shard\n for shard_id in job.shards.keys() {\n self.persist_job_progress(&job, *shard_id).await?;\n }\n }\n\n Ok(())\n }\n\n /// Persist a job to the task store.\n async fn persist_job(&self, job: &RebalanceJob) -> Result<(), String> {\n let progress = serde_json::to_string(job)\n .map_err(|e| format!(\"failed to serialize job: {}\", e))?;\n\n let new_job = NewJob {\n id: job.id.0.clone(),\n type_: \"rebalance\".to_string(),\n params: progress,\n state: if job.completed_at.is_some() {\n \"completed\".to_string()\n } else if job.paused {\n \"paused\".to_string()\n } else {\n \"running\".to_string()\n },\n progress: format!(\n \"{{\\\"total_shards\\\":{},\\\"completed\\\":{},\\\"docs_migrated\\\":{}}}\",\n job.shards.len(),\n job.shards\n .values()\n .filter(|s| s.phase == ShardMigrationPhase::OldReplicaDeleted)\n .count(),\n job.total_docs_migrated\n ),\n };\n\n tokio::task::spawn_blocking({\n let task_store = self.task_store.clone();\n let new_job = new_job.clone();\n move || {\n task_store.insert_job(&new_job)\n }\n })\n .await\n .map_err(|e| format!(\"failed to persist job: {}\", e))?\n .map_err(|e| format!(\"failed to persist job: {}\", e))?;\n\n Ok(())\n }\n\n /// Persist progress for a single shard.\n async fn persist_job_progress(\n &self,\n job: &RebalanceJob,\n shard_id: u32,\n ) -> Result<(), String> {\n if let Some(shard_state) = job.shards.get(&shard_id) {\n let progress = ShardMigrationProgress {\n shard_id,\n phase: format!(\"{:?}\", shard_state.phase),\n docs_migrated: shard_state.docs_migrated,\n last_offset: shard_state.last_offset,\n source_node: shard_state.source_node.clone(),\n target_node: shard_state.target_node.clone(),\n };\n\n let progress_json =\n serde_json::to_string(&progress)\n .map_err(|e| format!(\"failed to serialize progress: {}\", e))?;\n\n // Update job progress in task store\n tokio::task::spawn_blocking({\n let task_store = self.task_store.clone();\n let job_id = job.id.0.clone();\n let completed_at = format!(\"{:?}\", job.completed_at.is_some());\n let progress_json = progress_json.clone();\n move || {\n task_store.update_job_progress(&job_id, &completed_at, &progress_json)\n }\n })\n .await\n .map_err(|e| format!(\"failed to update job progress: {}\", e))?\n .map_err(|e| format!(\"failed to update job progress: {}\", e))?;\n }\n\n Ok(())\n }\n\n /// Sync worker job state with MigrationCoordinator state.\n ///\n /// This ensures that after a pod restart, the worker's job state reflects\n /// the actual migration state tracked by the coordinator.\n async fn sync_job_with_coordinator(&self, job: &mut RebalanceJob) -> Result<(), String> {\n let coordinator = self.migration_coordinator.read().await;\n\n // For each shard in the job, check if there's a corresponding migration\n // in the coordinator and sync the state\n for (&shard_id, shard_state) in job.shards.iter_mut() {\n let shard = ShardId(shard_id);\n\n // Look for a migration in the coordinator that affects this shard\n for (_mid, migration_state) in coordinator.get_all_migrations() {\n if let Some(migration_shard_state) = migration_state.affected_shards.get(&shard) {\n // Sync the phase based on the migration coordinator state\n use crate::migration::ShardMigrationState as CoordinatorState;\n shard_state.phase = match migration_shard_state {\n CoordinatorState::Pending => ShardMigrationPhase::Idle,\n CoordinatorState::Migrating { .. } => ShardMigrationPhase::MigrationInProgress,\n CoordinatorState::MigrationComplete { docs_copied } => {\n shard_state.docs_migrated = *docs_copied;\n ShardMigrationPhase::MigrationComplete\n }\n CoordinatorState::Draining { .. } => ShardMigrationPhase::DualWriteStopped,\n CoordinatorState::DeltaPass { docs_copied, delta_docs_copied } => {\n shard_state.docs_migrated = docs_copied + delta_docs_copied;\n ShardMigrationPhase::DualWriteStopped\n }\n CoordinatorState::Active => ShardMigrationPhase::OldReplicaDeleted,\n CoordinatorState::Failed { .. } => ShardMigrationPhase::Failed,\n };\n }\n }\n }\n\n Ok(())\n }\n\n /// Start dual-write phase for a shard.\n async fn start_dual_write_for_shard(&self, _replica_group: u32, shard_id: u32) -> Result<(), String> {\n let shard = ShardId(shard_id);\n let mut coordinator = self.migration_coordinator.write().await;\n\n // Find or create the migration for this shard\n // For now, we'll create a new migration if one doesn't exist\n // In production, this would be created when the job is created\n\n info!(\n shard_id,\n \"starting dual-write phase\"\n );\n\n // The dual-write is handled by the router checking is_dual_write_active\n // We just need to ensure the migration coordinator knows about this shard\n Ok(())\n }\n\n /// Begin cutover sequence for a shard.\n async fn begin_cutover_for_shard(&self, shard_id: u32) -> Result<(), String> {\n info!(\n shard_id,\n \"beginning cutover sequence\"\n );\n\n let shard = ShardId(shard_id);\n let mut coordinator = self.migration_coordinator.write().await;\n\n // Collect the migrations that affect this shard first\n let migrations_to_cutover: Vec<_> = coordinator.get_all_migrations()\n .iter()\n .filter(|(_, migration_state)| migration_state.affected_shards.contains_key(&shard))\n .map(|(mid, _)| *mid)\n .collect();\n\n // Now perform the cutover\n for mid in migrations_to_cutover {\n coordinator.begin_cutover(mid).map_err(|e| e.to_string())?;\n break; // Only need to cutover one migration per shard\n }\n\n Ok(())\n }\n\n /// Complete cutover and delete old replica for a shard.\n async fn complete_cutover_for_shard(&self, shard_id: u32) -> Result<(), String> {\n info!(\n shard_id,\n \"completing cutover and deleting old replica\"\n );\n\n let shard = ShardId(shard_id);\n let mut coordinator = self.migration_coordinator.write().await;\n\n // Collect the migrations that affect this shard first\n let migrations_to_complete: Vec<_> = coordinator.get_all_migrations()\n .iter()\n .filter(|(_, migration_state)| migration_state.affected_shards.contains_key(&shard))\n .map(|(mid, _)| *mid)\n .collect();\n\n // Now complete the cleanup\n for mid in migrations_to_complete {\n coordinator.complete_drain(mid).map_err(|e| e.to_string())?;\n coordinator.complete_cleanup(mid).map_err(|e| e.to_string())?;\n break; // Only need to complete one migration per shard\n }\n\n Ok(())\n }\n\n /// Start background migration for a shard.\n async fn start_background_migration_for_shard(&self, shard_id: u32) -> Result<(), String> {\n info!(\n shard_id,\n \"starting background migration\"\n );\n\n // The actual migration is handled by the Rebalancer component's migration executor\n // This method just signals that we're ready for background migration to proceed\n Ok(())\n }\n\n /// Check if migration is complete for a shard.\n async fn check_migration_complete_for_shard(&self, shard_id: u32) -> Result {\n let shard = ShardId(shard_id);\n let coordinator = self.migration_coordinator.read().await;\n\n // Check if the migration coordinator has marked this shard as complete\n for (_mid, migration_state) in coordinator.get_all_migrations() {\n if let Some(shard_state) = migration_state.affected_shards.get(&shard) {\n use crate::migration::ShardMigrationState as CoordinatorState;\n if matches!(shard_state, CoordinatorState::MigrationComplete { .. }) {\n return Ok(true);\n }\n }\n }\n\n Ok(false)\n }\n\n /// Execute background migration for a shard.\n ///\n /// This performs the actual document migration from source to target node\n /// using pagination to stay within memory bounds.\n async fn execute_background_migration(\n &self,\n executor: &Arc,\n migration_id: MigrationId,\n shard_id: u32,\n old_node_id: &MigrationNodeId,\n old_address: &str,\n new_node_id: &str,\n new_address: &str,\n index_uid: &str,\n ) -> Result<(), String> {\n info!(\n migration_id = %migration_id,\n shard_id,\n from = %old_node_id.0,\n to = %new_node_id,\n \"starting shard migration\"\n );\n\n // Paginate through all documents for this shard\n let mut offset = 0u32;\n let limit = self.config.migration_batch_size;\n let mut total_docs_copied = 0u64;\n\n loop {\n // Fetch documents from source\n let (docs, _total) = executor.fetch_documents(\n &old_node_id.0,\n old_address,\n index_uid,\n shard_id,\n limit,\n offset,\n ).await.map_err(|e| format!(\"fetch failed: {}\", e))?;\n\n if docs.is_empty() {\n break; // No more documents\n }\n\n // Write documents to target\n executor.write_documents(\n new_node_id,\n new_address,\n index_uid,\n docs.clone(),\n ).await.map_err(|e| format!(\"write failed: {}\", e))?;\n\n total_docs_copied += docs.len() as u64;\n offset += limit;\n\n // Throttle if configured\n if self.config.migration_batch_delay_ms > 0 {\n tokio::time::sleep(Duration::from_millis(\n self.config.migration_batch_delay_ms,\n ))\n .await;\n }\n }\n\n // Mark shard migration complete in coordinator\n {\n let mut coordinator = self.migration_coordinator.write().await;\n coordinator.shard_migration_complete(migration_id, ShardId(shard_id), total_docs_copied)\n .map_err(|e| format!(\"failed to mark shard complete: {}\", e))?;\n }\n\n // Update metrics\n {\n let mut metrics = self.metrics.write().await;\n metrics.record_documents_migrated(total_docs_copied);\n }\n\n // Call metrics callback for documents migrated\n if let Some(ref callback) = self.metrics_callback {\n callback(false, Some(total_docs_copied), None);\n }\n\n info!(\n migration_id = %migration_id,\n shard_id,\n docs_copied = total_docs_copied,\n \"shard migration complete\"\n );\n\n Ok(())\n }\n\n /// Pause an in-progress rebalance.\n\n /// Pause an in-progress rebalance.\n pub async fn pause_rebalance(&self, index_uid: &str) -> Result<(), String> {\n let job_id = RebalanceJobId::new(index_uid);\n let mut jobs = self.jobs.write().await;\n\n if let Some(job) = jobs.get_mut(&job_id) {\n job.paused = true;\n info!(index_uid = %index_uid, \"paused rebalance\");\n Ok(())\n } else {\n Err(format!(\"no rebalance job found for index {}\", index_uid))\n }\n }\n\n /// Resume a paused rebalance.\n pub async fn resume_rebalance(&self, index_uid: &str) -> Result<(), String> {\n let job_id = RebalanceJobId::new(index_uid);\n let mut jobs = self.jobs.write().await;\n\n if let Some(job) = jobs.get_mut(&job_id) {\n job.paused = false;\n info!(index_uid = %index_uid, \"resumed rebalance\");\n Ok(())\n } else {\n Err(format!(\"no rebalance job found for index {}\", index_uid))\n }\n }\n\n /// Load persisted jobs from task store on startup.\n pub async fn load_persisted_jobs(&self) -> Result<(), String> {\n let jobs = tokio::task::spawn_blocking({\n let task_store = self.task_store.clone();\n move || {\n task_store.list_jobs_by_state(\"running\")\n }\n })\n .await\n .map_err(|e| format!(\"failed to list jobs: {}\", e))?\n .map_err(|e| format!(\"failed to list jobs: {}\", e))?;\n\n for job_row in jobs {\n if job_row.type_ == \"rebalance\" {\n if let Ok(job) = serde_json::from_str::(&job_row.params) {\n info!(\n index_uid = %job.index_uid,\n \"loaded persisted rebalance job\"\n );\n let mut jobs = self.jobs.write().await;\n jobs.insert(job.id.clone(), job);\n }\n }\n }\n\n Ok(())\n }\n}\n\n/// Status of the rebalancer worker for monitoring.\n#[derive(Debug, Clone, Serialize, Deserialize)]\npub struct RebalancerWorkerStatus {\n /// Number of active rebalance jobs.\n pub active_jobs: usize,\n /// Number of completed rebalance jobs.\n pub completed_jobs: usize,\n /// Number of paused rebalance jobs.\n pub paused_jobs: usize,\n /// Total number of shards across all jobs.\n pub total_shards: usize,\n /// Number of completed shard migrations.\n pub completed_shards: usize,\n}\n\n/// Get current time in milliseconds since Unix epoch.\nfn now_ms() -> i64 {\n std::time::SystemTime::now()\n .duration_since(std::time::UNIX_EPOCH)\n .unwrap_or_default()\n .as_millis() as i64\n}\n\n/// Convert a topology NodeId to a migration NodeId.\nfn topo_to_migration_node_id(id: &TopologyNodeId) -> MigrationNodeId {\n crate::migration::NodeId(id.as_str().to_string())\n}\n\n/// Convert a migration NodeId to a topology NodeId.\nfn migration_to_topo_node_id(id: &MigrationNodeId) -> TopologyNodeId {\n TopologyNodeId::new(id.0.clone())\n}\n\n/// Get the old node owner for a specific shard.\nfn old_node_owners_for_shard(old_owners: &HashMap, shard_id: u32) -> MigrationNodeId {\n old_owners.get(&ShardId(shard_id))\n .cloned()\n .unwrap_or_else(|| crate::migration::NodeId(\"unknown\".to_string()))\n}\n\n#[cfg(test)]\nmod tests {\n use super::*;\n use crate::config::MiroirConfig;\n use crate::migration::MigrationConfig;\n use crate::topology::Node;\n use std::sync::Arc;\n\n fn test_topology() -> Topology {\n let mut topo = Topology::new(64, 2, 2);\n topo.add_node(Node::new(\n TopologyNodeId::new(\"node-0\".into()),\n \"http://node-0:7700\".into(),\n 0,\n ));\n topo.add_node(Node::new(\n TopologyNodeId::new(\"node-1\".into()),\n \"http://node-1:7700\".into(),\n 0,\n ));\n topo.add_node(Node::new(\n TopologyNodeId::new(\"node-2\".into()),\n \"http://node-2:7700\".into(),\n 1,\n ));\n topo.add_node(Node::new(\n TopologyNodeId::new(\"node-3\".into()),\n \"http://node-3:7700\".into(),\n 1,\n ));\n topo\n }\n\n #[test]\n fn test_rebalance_job_id() {\n let job_id = RebalanceJobId::new(\"test-index\");\n assert_eq!(job_id.0, \"rebalance:test-index\");\n assert_eq!(job_id.index_uid(), \"test-index\");\n }\n\n #[test]\n fn test_worker_config_default() {\n let config = RebalancerWorkerConfig::default();\n assert_eq!(config.max_concurrent_migrations, 4);\n assert_eq!(config.lease_ttl_secs, LEASE_TTL_SECS);\n assert_eq!(config.lease_renewal_interval_ms, LEASE_RENEWAL_INTERVAL_MS);\n }\n\n #[tokio::test]\n async fn test_compute_affected_shards_for_add() {\n let topo = Arc::new(RwLock::new(test_topology()));\n let config = RebalancerWorkerConfig::default();\n\n // Create a mock task store (in-memory for testing)\n // Note: This would need a proper mock TaskStore implementation\n // For now, we'll skip the full integration test\n\n // Test that adding a node to group 0 affects some shards\n let new_node_id = \"node-new\";\n let replica_group = 0;\n\n // We'd need to instantiate the worker with a proper mock task store\n // This is a placeholder for the actual test\n }\n\n #[test]\n fn test_shard_migration_phase_serialization() {\n let phase = ShardMigrationPhase::MigrationInProgress;\n let json = serde_json::to_string(&phase).unwrap();\n assert!(json.contains(\"MigrationInProgress\"));\n\n let deserialized: ShardMigrationPhase = serde_json::from_str(&json).unwrap();\n assert_eq!(deserialized, phase);\n }\n\n #[test]\n fn test_topology_event_serialization() {\n let event = TopologyChangeEvent::NodeAdded {\n node_id: \"node-4\".to_string(),\n replica_group: 0,\n index_uid: \"test\".to_string(),\n };\n\n let json = serde_json::to_string(&event).unwrap();\n assert!(json.contains(\"NodeAdded\"));\n\n let deserialized: TopologyChangeEvent = serde_json::from_str(&json).unwrap();\n match deserialized {\n TopologyChangeEvent::NodeAdded {\n node_id,\n replica_group,\n index_uid,\n } => {\n assert_eq!(node_id, \"node-4\");\n assert_eq!(replica_group, 0);\n assert_eq!(index_uid, \"test\");\n }\n _ => panic!(\"wrong event type\"),\n }\n }\n}\n","numLines":1682,"startLine":1,"totalLines":1682}}} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_a9d5dd1faff54c87bd4d654c","type":"tool_result","content":"1\tuse axum::{\n2\t extract::FromRef,\n3\t routing::{get, post},\n4\t Router,\n5\t};\n6\tuse miroir_core::{\n7\t config::MiroirConfig,\n8\t peer_discovery::PeerDiscovery,\n9\t rebalancer_worker::{RebalancerWorker, RebalancerWorkerConfig, TopologyChangeEvent},\n10\t task_pruner,\n11\t topology::{NodeStatus, Topology},\n12\t};\n13\tuse std::net::SocketAddr;\n14\tuse std::time::Duration;\n15\tuse tokio::signal;\n16\tuse tracing::{error, info};\n17\tuse tracing_subscriber::{EnvFilter, layer::SubscriberExt, registry, util::SubscriberInitExt};\n18\t\n19\tmod admin_session;\n20\tmod auth;\n21\tmod client;\n22\tmod middleware;\n23\tmod otel;\n24\tmod routes;\n25\tmod scoped_key_rotation;\n26\t\n27\tuse admin_session::SealKey;\n28\tuse auth::AuthState;\n29\tuse miroir_core::{\n30\t canary::{CanaryAssertion, CanaryRunner, CapturedQuery, QueryCapture, SearchQuery, SearchResponse},\n31\t task_store::TaskStore,\n32\t};\n33\tuse middleware::{Metrics, metrics_router, TelemetryState};\n34\tuse routes::{\n35\t admin, admin_endpoints, explain, health, indexes, keys, multi_search, search, settings, tasks, version,\n36\t};\n37\tuse scoped_key_rotation::ScopedKeyRotationState;\n38\tuse std::sync::Arc;\n39\t\n40\t/// Unified application state containing all shared state.\n41\t#[derive(Clone)]\n42\tstruct UnifiedState {\n43\t auth: AuthState,\n44\t metrics: Metrics,\n45\t admin: admin_endpoints::AppState,\n46\t pod_id: String,\n47\t redis_store: Option,\n48\t query_capture: Arc,\n49\t peer_discovery: Option>,\n50\t}\n51\t\n52\timpl UnifiedState {\n53\t fn new(config: MiroirConfig) -> Self {\n54\t let metrics = Metrics::new(&config);\n55\t\n56\t let master_key = std::env::var(\"MIROIR_MASTER_KEY\")\n57\t .unwrap_or_else(|_| config.master_key.clone());\n58\t\n59\t let admin_key = std::env::var(\"MIROIR_ADMIN_API_KEY\")\n60\t .unwrap_or_else(|_| config.admin.api_key.clone());\n61\t\n62\t let jwt_primary = if config.search_ui.enabled {\n63\t std::env::var(&config.search_ui.auth.jwt_secret_env).ok()\n64\t } else {\n65\t None\n66\t };\n67\t\n68\t let jwt_previous = std::env::var(&config.search_ui.auth.jwt_secret_previous_env)\n69\t .ok()\n70\t .filter(|v| !v.is_empty());\n71\t\n72\t let seal_key = SealKey::from_env_or_generate();\n73\t\n74\t // Set the key-generated gauge before constructing AuthState\n75\t // so the metric is accurate from the first scrape.\n76\t metrics.admin_session_key_generated().set(if seal_key.is_generated() { 1.0 } else { 0.0 });\n77\t\n78\t let pod_id = std::env::var(\"POD_NAME\").unwrap_or_else(|_| \"unknown\".to_string());\n79\t let namespace = std::env::var(\"POD_NAMESPACE\").unwrap_or_else(|_| \"default\".to_string());\n80\t\n81\t // Create peer discovery instance (plan §14.5)\n82\t // Only enabled when running in Kubernetes (POD_NAME is set to a real pod name)\n83\t let peer_discovery = if pod_id != \"unknown\" {\n84\t Some(Arc::new(PeerDiscovery::new(\n85\t pod_id.clone(),\n86\t namespace,\n87\t config.peer_discovery.service_name.clone(),\n88\t )))\n89\t } else {\n90\t None\n91\t };\n92\t\n93\t // Create Redis task store if backend is redis (must happen before AppState\n94\t // so redis_store and pod_id are available to admin endpoints).\n95\t let redis_store = if config.task_store.backend == \"redis\" && !config.task_store.url.is_empty() {\n96\t let url = config.task_store.url.clone();\n97\t Some(\n98\t tokio::task::block_in_place(|| {\n99\t tokio::runtime::Handle::current().block_on(\n100\t miroir_core::task_store::RedisTaskStore::open(&url)\n101\t )\n102\t })\n103\t .expect(\"Failed to connect to Redis for scoped key rotation\"),\n104\t )\n105\t } else {\n106\t None\n107\t };\n108\t\n109\t let auth = AuthState {\n110\t master_key,\n111\t admin_key: admin_key.clone(),\n112\t jwt_primary,\n113\t jwt_previous,\n114\t seal_key: seal_key.clone(),\n115\t revoked_sessions: std::sync::Arc::new(dashmap::DashMap::new()),\n116\t admin_session_revoked_total: metrics.admin_session_revoked_total(),\n117\t };\n118\t\n119\t let admin = admin_endpoints::AppState::with_redis(\n120\t config.clone(),\n121\t metrics.clone(),\n122\t redis_store.clone(),\n123\t pod_id.clone(),\n124\t seal_key.clone(),\n125\t );\n126\t\n127\t Self {\n128\t auth,\n129\t metrics,\n130\t admin,\n131\t pod_id,\n132\t redis_store,\n133\t query_capture: Arc::new(QueryCapture::new(1000)),\n134\t peer_discovery,\n135\t }\n136\t }\n137\t}\n138\t\n139\t// Implement FromRef so that admin_endpoints::AppState can be extracted from UnifiedState\n140\timpl FromRef for admin_endpoints::AppState {\n141\t fn from_ref(state: &UnifiedState) -> Self {\n142\t Self {\n143\t config: state.admin.config.clone(),\n144\t topology: state.admin.topology.clone(),\n145\t ready: state.admin.ready.clone(),\n146\t metrics: state.admin.metrics.clone(),\n147\t version_state: state.admin.version_state.clone(),\n148\t task_registry: state.admin.task_registry.clone(),\n149\t redis_store: state.redis_store.clone(),\n150\t task_store: state.admin.task_store.clone(),\n151\t pod_id: state.pod_id.clone(),\n152\t seal_key: state.auth.seal_key.clone(),\n153\t local_rate_limiter: admin_endpoints::LocalAdminRateLimiter::new(),\n154\t local_search_ui_rate_limiter: admin_endpoints::LocalSearchUiRateLimiter::new(),\n155\t rebalancer: state.admin.rebalancer.clone(),\n156\t migration_coordinator: state.admin.migration_coordinator.clone(),\n157\t rebalancer_worker: state.admin.rebalancer_worker.clone(),\n158\t rebalancer_metrics: state.admin.rebalancer_metrics.clone(),\n159\t previous_docs_migrated: state.admin.previous_docs_migrated.clone(),\n160\t settings_broadcast: state.admin.settings_broadcast.clone(),\n161\t drift_reconciler: state.admin.drift_reconciler.clone(),\n162\t session_manager: state.admin.session_manager.clone(),\n163\t alias_registry: state.admin.alias_registry.clone(),\n164\t }\n165\t }\n166\t}\n167\t\n168\t// Implement FromRef so that TelemetryState can be extracted from UnifiedState\n169\timpl FromRef for TelemetryState {\n170\t fn from_ref(state: &UnifiedState) -> Self {\n171\t TelemetryState {\n172\t metrics: state.metrics.clone(),\n173\t pod_id: state.pod_id.clone(),\n174\t }\n175\t }\n176\t}\n177\t\n178\t// Implement FromRef so that CsrfState can be extracted from UnifiedState\n179\timpl FromRef for auth::CsrfState {\n180\t fn from_ref(state: &UnifiedState) -> Self {\n181\t auth::CsrfState {\n182\t auth: state.auth.clone(),\n183\t redis_store: state.redis_store.clone(),\n184\t }\n185\t }\n186\t}\n187\t\n188\t// Implement FromRef so that routes::aliases::AliasState can be extracted from UnifiedState\n189\timpl FromRef for routes::aliases::AliasState {\n190\t fn from_ref(state: &UnifiedState) -> Self {\n191\t Self {\n192\t config: state.admin.config.clone(),\n193\t task_store: state.admin.task_store.clone(),\n194\t metrics: state.metrics.clone(),\n195\t }\n196\t }\n197\t}\n198\t\n199\t// Implement FromRef so that routes::explain::ExplainState can be extracted from UnifiedState\n200\timpl FromRef for routes::explain::ExplainState {\n201\t fn from_ref(state: &UnifiedState) -> Self {\n202\t Self {\n203\t config: state.admin.config.clone(),\n204\t topology: state.admin.topology.clone(),\n205\t }\n206\t }\n207\t}\n208\t\n209\t// Implement FromRef so that routes::multi_search::MultiSearchState can be extracted from UnifiedState\n210\timpl FromRef for routes::multi_search::MultiSearchState {\n211\t fn from_ref(state: &UnifiedState) -> Self {\n212\t Self {\n213\t config: state.admin.config.clone(),\n214\t topology: state.admin.topology.clone(),\n215\t node_master_key: state.admin.config.master_key.clone(),\n216\t metrics: state.metrics.clone(),\n217\t alias_registry: state.admin.alias_registry.clone(),\n218\t }\n219\t }\n220\t}\n221\t\n222\t// Implement FromRef so that routes::canary::CanaryState can be extracted from UnifiedState\n223\timpl FromRef for routes::canary::CanaryState {\n224\t fn from_ref(state: &UnifiedState) -> Self {\n225\t // Canary routes require Redis task store\n226\t let redis_store = state.redis_store.clone()\n227\t .expect(\"Canary routes require Redis task store (task_store.backend: redis)\");\n228\t let store: Arc = Arc::from(redis_store);\n229\t Self {\n230\t store,\n231\t capture: state.query_capture.clone(),\n232\t }\n233\t }\n234\t}\n235\t\n236\t#[tokio::main]\n237\tasync fn main() -> anyhow::Result<()> {\n238\t // Load configuration (file → env → CLI overlay)\n239\t let config = MiroirConfig::load()\n240\t .map_err(|e| anyhow::anyhow!(\"Failed to load config: {}\", e))?;\n241\t\n242\t // Initialize structured JSON logging (plan §10 format)\n243\t // Fields on every line: timestamp, level, target, message, pod_id\n244\t // Per-request fields (request_id) are added by telemetry middleware span.\n245\t let filter = EnvFilter::try_from_default_env()\n246\t .unwrap_or_else(|_| EnvFilter::new(\"info\"));\n247\t\n248\t let pod_id = std::env::var(\"POD_NAME\").unwrap_or_else(|_| \"unknown\".to_string());\n249\t\n250\t // Build subscriber - conditionally add OTel layer\n251\t // Note: We rebuild the layers in each branch because the types differ\n252\t // OTel layer must be applied to the bare registry first\n253\t if let Some(otel_layer) = otel::init_otel_layer(&config) {\n254\t let json_layer = tracing_subscriber::fmt::layer()\n255\t .json()\n256\t .flatten_event(true)\n257\t .with_target(true)\n258\t .with_current_span(true)\n259\t .with_span_list(false);\n260\t // Apply OTel layer to registry first, then add filter and json layer\n261\t registry()\n262\t .with(otel_layer)\n263\t .with(filter)\n264\t .with(json_layer)\n265\t .init();\n266\t } else {\n267\t let json_layer = tracing_subscriber::fmt::layer()\n268\t .json()\n269\t .flatten_event(true)\n270\t .with_target(true)\n271\t .with_current_span(true)\n272\t .with_span_list(false);\n273\t registry()\n274\t .with(filter)\n275\t .with(json_layer)\n276\t .init();\n277\t }\n278\t\n279\t // Set pod_id as a global default field so it appears on every log line.\n280\t // This is done via a separate info span that is entered once and never\n281\t // left — its fields propagate to all child spans and events.\n282\t let _pod_span = tracing::info_span!(\"runtime\", pod_id = %pod_id).entered();\n283\t\n284\t info!(\n285\t shards = config.shards,\n286\t replication_factor = config.replication_factor,\n287\t replica_groups = config.replica_groups,\n288\t \"miroir-proxy starting\"\n289\t );\n290\t\n291\t // Validate critical secrets at startup (plan §9: \"orchestrator refuses to\n292\t // start the search UI without it\").\n293\t if config.search_ui.enabled {\n294\t let jwt_env = &config.search_ui.auth.jwt_secret_env;\n295\t match std::env::var(jwt_env) {\n296\t Ok(v) if !v.is_empty() => {}\n297\t _ => {\n298\t anyhow::bail!(\n299\t \"search_ui is enabled but {} is not set — refusing to start. \\\n300\t Either set the env var or disable search_ui (search_ui.enabled: false)\",\n301\t jwt_env\n302\t );\n303\t }\n304\t }\n305\t }\n306\t\n307\t // Build unified state\n308\t let state = UnifiedState::new(config.clone());\n309\t\n310\t // Start health checker background task\n311\t let health_checker_state = state.admin.clone();\n312\t tokio::spawn(async move {\n313\t run_health_checker(health_checker_state).await;\n314\t });\n315\t\n316\t // Start rebalancer worker background task (plan §4)\n317\t if let Some(ref worker) = state.admin.rebalancer_worker {\n318\t let worker = worker.clone();\n319\t let pod_id = state.pod_id.clone();\n320\t tokio::spawn(async move {\n321\t info!(\n322\t pod_id = %pod_id,\n323\t \"rebalancer worker task starting\"\n324\t );\n325\t // Load any persisted rebalance jobs from previous runs\n326\t if let Err(e) = worker.load_persisted_jobs().await {\n327\t error!(error = %e, \"failed to load persisted rebalance jobs\");\n328\t }\n329\t worker.run().await;\n330\t error!(\"rebalancer worker task exited unexpectedly\");\n331\t });\n332\t } else {\n333\t info!(\"rebalancer worker not available (no task store configured)\");\n334\t }\n335\t\n336\t // Start scoped key rotation background task (requires Redis)\n337\t if let Some(ref redis) = state.redis_store {\n338\t let rotation_state = ScopedKeyRotationState {\n339\t config: state.admin.config.clone(),\n340\t redis: redis.clone(),\n341\t pod_id: state.pod_id.clone(),\n342\t };\n343\t tokio::spawn(async move {\n344\t scoped_key_rotation::run_scoped_key_rotator(rotation_state).await;\n345\t });\n346\t\n347\t // Start admin session revocation Pub/Sub subscriber (plan §9).\n348\t // When any pod revokes a session (logout), the session ID is published\n349\t // to `miroir:admin_session:revoked`. Every pod subscribes and adds the\n350\t // ID to its in-memory DashMap, ensuring revoked cookies are rejected\n351\t // across all pods within milliseconds.\n352\t let revoked_sessions = state.auth.revoked_sessions.clone();\n353\t let revoked_total = state.auth.admin_session_revoked_total.clone();\n354\t let redis_url = config.task_store.url.clone();\n355\t let key_prefix = redis.key_prefix().to_string();\n356\t tokio::spawn(async move {\n357\t info!(\"starting admin session revocation subscriber\");\n358\t if let Err(e) = miroir_core::task_store::RedisTaskStore::subscribe_session_revocations(\n359\t &redis_url,\n360\t &key_prefix,\n361\t move |session_id: String| {\n362\t revoked_sessions.insert(session_id, ());\n363\t revoked_total.inc();\n364\t },\n365\t )\n366\t .await\n367\t {\n368\t error!(error = %e, \"admin session revocation subscriber exited with error\");\n369\t }\n370\t });\n371\t }\n372\t\n373\t // Load aliases from task store on startup (plan §13.7)\n374\t // Aliases must be loaded before any request routing to ensure consistent resolution\n375\t if let Some(ref task_store) = state.admin.task_store {\n376\t let alias_registry = state.admin.alias_registry.clone();\n377\t let store = task_store.clone();\n378\t tokio::spawn(async move {\n379\t info!(\"loading aliases from task store\");\n380\t match alias_registry.sync_from_store(&*store).await {\n381\t Ok(()) => {\n382\t let count = alias_registry.list().await.len();\n383\t info!(count, \"aliases loaded successfully\");\n384\t }\n385\t Err(e) => {\n386\t error!(error = %e, \"failed to load aliases from task store\");\n387\t }\n388\t }\n389\t });\n390\t } else {\n391\t info!(\"alias loading skipped (no task store configured)\");\n392\t }\n393\t\n394\t // Start drift reconciler background task (plan §13.5)\n395\t // Uses the drift_reconciler from AppState which is already configured\n396\t if let Some(ref drift_reconciler) = state.admin.drift_reconciler {\n397\t let drift_reconciler = drift_reconciler.clone();\n398\t tokio::spawn(async move {\n399\t info!(\"drift reconciler started\");\n400\t drift_reconciler.run().await;\n401\t error!(\"drift reconciler exited unexpectedly\");\n402\t });\n403\t } else {\n404\t info!(\"drift reconciler not available (no task store configured)\");\n405\t }\n406\t\n407\t // Start peer discovery refresh loop (plan §14.5)\n408\t // Periodically performs SRV lookups to discover peer pods\n409\t if let Some(ref peer_discovery) = state.peer_discovery {\n410\t let peer_discovery = peer_discovery.clone();\n411\t let metrics = state.metrics.clone();\n412\t let refresh_interval_s = config.peer_discovery.refresh_interval_s;\n413\t tokio::spawn(async move {\n414\t let mut interval = tokio::time::interval(Duration::from_secs(refresh_interval_s));\n415\t info!(\n416\t interval_s = refresh_interval_s,\n417\t \"peer discovery refresh loop started\"\n418\t );\n419\t loop {\n420\t interval.tick().await;\n421\t match peer_discovery.refresh().await {\n422\t Ok(peer_set) => {\n423\t let count = peer_set.len() as u64;\n424\t info!(\n425\t peer_count = count,\n426\t \"peer discovery refresh completed\"\n427\t );\n428\t metrics.set_peer_pod_count(count);\n429\t }\n430\t Err(e) => {\n431\t error!(error = %e, \"peer discovery refresh failed\");\n432\t }\n433\t }\n434\t }\n435\t });\n436\t } else {\n437\t info!(\"peer discovery disabled (not running in Kubernetes)\");\n438\t }\n439\t\n440\t // Start task registry TTL pruner background task (plan §4, Phase 3)\n441\t // Runs on single-pod with advisory lock; Phase 6 §14.5 Mode A replaces with rendezvous\n442\t if let Some(ref store) = state.admin.task_store {\n443\t let store = store.clone();\n444\t let pruner_config = config.task_registry.clone();\n445\t tokio::spawn(async move {\n446\t // The pruner runs in its own thread via spawn_pruner\n447\t let _pruner_handle = task_pruner::spawn_pruner(store, pruner_config);\n448\t // The handle is dropped here only on process exit\n449\t info!(\"task registry TTL pruner started\");\n450\t // Keep this task alive forever\n451\t std::future::pending::<()>().await;\n452\t });\n453\t } else {\n454\t info!(\"task registry TTL pruner not available (no task store)\");\n455\t }\n456\t\n457\t // Start canary runner background task (plan §13.18)\n458\t // Only enabled when canary_runner.enabled = true and Redis is available\n459\t if config.canary_runner.enabled {\n460\t if let Some(ref redis) = state.redis_store {\n461\t let store: Arc = Arc::from(redis.clone());\n462\t let canary_config = config.canary_runner.clone();\n463\t\n464\t // Clone config values for the search executor\n465\t let search_config = config.clone();\n466\t let search_executor: miroir_core::canary::SearchExecutor = Arc::new(\n467\t move |index_uid: &str, query: &SearchQuery| -> std::pin::Pin> + Send>> {\n468\t let index_uid = index_uid.to_string();\n469\t let query = query.clone();\n470\t let config = search_config.clone();\n471\t\n472\t Box::pin(async move {\n473\t // For canary queries, we execute against the first available healthy node\n474\t let node_addresses: Vec<_> = config.nodes.iter()\n475\t .map(|n| n.address.clone())\n476\t .collect();\n477\t\n478\t for address in node_addresses {\n479\t let client = match reqwest::Client::builder()\n480\t .timeout(std::time::Duration::from_millis(config.scatter.node_timeout_ms))\n481\t .build()\n482\t {\n483\t Ok(c) => c,\n484\t Err(_) => continue,\n485\t };\n486\t\n487\t let url = format!(\"{}/indexes/{}/search\", address.trim_end_matches('/'), index_uid);\n488\t\n489\t // Build the search request body\n490\t let mut body = match serde_json::to_value(&query) {\n491\t Ok(v) => v,\n492\t Err(e) => return Err(miroir_core::error::MiroirError::InvalidRequest(format!(\"Failed to serialize query: {}\", e))),\n493\t };\n494\t\n495\t // Add limit to avoid large responses for canary queries\n496\t if !body.get(\"limit\").and_then(|v| v.as_u64()).is_some() {\n497\t body[\"limit\"] = serde_json::json!(20);\n498\t }\n499\t\n500\t let response = match client.post(&url)\n501\t .header(\"Authorization\", format!(\"Bearer {}\", config.node_master_key))\n502\t .json(&body)\n503\t .send()\n504\t .await\n505\t {\n506\t Ok(r) => r,\n507\t Err(_) => continue,\n508\t };\n509\t\n510\t if response.status().is_success() {\n511\t if let Ok(text) = response.text().await {\n512\t if let Ok(search_response) = serde_json::from_str::(&text) {\n513\t return Ok(search_response);\n514\t }\n515\t }\n516\t }\n517\t }\n518\t\n519\t // All nodes failed\n520\t Err(miroir_core::error::MiroirError::Topology(\n521\t \"All nodes failed for canary query\".to_string()\n522\t ))\n523\t })\n524\t }\n525\t );\n526\t\n527\t // Create metrics emitter callback\n528\t let metrics_for_canary = state.metrics.clone();\n529\t let metrics_emitter: miroir_core::canary::MetricsEmitter = Arc::new(\n530\t move |result| {\n531\t use miroir_core::canary::CanaryStatus;\n532\t let result_str = match result.status {\n533\t CanaryStatus::Passed => \"passed\",\n534\t CanaryStatus::Failed => \"failed\",\n535\t CanaryStatus::Error => \"error\",\n536\t };\n537\t metrics_for_canary.inc_canary_runs(&result.canary_id, result_str);\n538\t metrics_for_canary.observe_canary_latency_ms(&result.canary_id, result.latency_ms as f64);\n539\t\n540\t for failure in &result.failed_assertions {\n541\t metrics_for_canary.inc_canary_assertion_failures(&result.canary_id, &failure.assertion_type);\n542\t }\n543\t }\n544\t );\n545\t\n546\t // Create settings version checker callback\n547\t let store_for_version = store.clone();\n548\t let version_config = config.clone();\n549\t let settings_version_checker: miroir_core::canary::SettingsVersionChecker = Arc::new(\n550\t move |index_uid: &str| -> Option {\n551\t // Try to get the settings version from the task store\n552\t let node_ids: Vec = version_config.nodes.iter()\n553\t .map(|n| n.id.clone())\n554\t .collect();\n555\t\n556\t let mut min_version: Option = None;\n557\t for node_id in node_ids {\n558\t if let Ok(Some(row)) = store_for_version.get_node_settings_version(index_uid, &node_id) {\n559\t match min_version {\n560\t None => min_version = Some(row.version),\n561\t Some(current) if row.version < current => min_version = Some(row.version),\n562\t _ => {}\n563\t }\n564\t }\n565\t }\n566\t min_version\n567\t }\n568\t );\n569\t\n570\t // Create and start the canary runner\n571\t let runner = CanaryRunner::new(\n572\t store,\n573\t canary_config.max_concurrent_canaries as usize,\n574\t canary_config.run_history_per_canary as usize,\n575\t search_executor,\n576\t metrics_emitter,\n577\t settings_version_checker,\n578\t );\n579\t\n580\t tokio::spawn(async move {\n581\t info!(\"canary runner started\");\n582\t if let Err(e) = runner.start().await {\n583\t error!(\"canary runner exited: {}\", e);\n584\t }\n585\t });\n586\t } else {\n587\t info!(\"canary runner enabled but Redis not available - skipping\");\n588\t }\n589\t }\n590\t\n591\t // Build the main app router with UnifiedState\n592\t let app = Router::new()\n593\t .route(\"/health\", get(health::get_health))\n594\t .route(\"/version\", get(version::get_version::))\n595\t .route(\"/stats\", get(indexes::global_stats_handler))\n596\t .route(\"/multi-search\", post(multi_search::multi_search::)) // §13.11\n597\t .nest(\"/_miroir\", admin::router::())\n598\t .nest(\"/indexes\", indexes::router::())\n599\t .nest(\"/keys\", keys::router::())\n600\t .nest(\"/search\", search::router::())\n601\t .nest(\"/settings\", settings::router::())\n602\t .nest(\"/tasks\", tasks::router::())\n603\t // IMPORTANT: Layer order matters! Last layer() call = outermost = runs first.\n604\t // The middleware stack (from outermost to innermost):\n605\t // 1. csrf_middleware - runs first\n606\t // 2. auth_middleware\n607\t // 3. Extension layers\n608\t // 4. session_pinning_middleware - extracts X-Miroir-Session header\n609\t // 5. request_id_middleware - sets X-Request-Id header\n610\t // 6. telemetry_middleware - reads X-Request-Id, creates tracing span with request_id field\n611\t // The span's request_id field propagates to all child log events via with_current_span(true)\n612\t //\n613\t // To achieve this order, we add layers in REVERSE (last call = outermost):\n614\t .layer(axum::middleware::from_fn_with_state(\n615\t TelemetryState {\n616\t metrics: state.metrics.clone(),\n617\t pod_id: state.pod_id.clone(),\n618\t },\n619\t middleware::telemetry_middleware,\n620\t ))\n621\t .layer(axum::middleware::from_fn(\n622\t middleware::request_id_middleware,\n623\t ))\n624\t .layer(axum::middleware::from_fn(\n625\t middleware::session_pinning_middleware,\n626\t ))\n627\t .layer(axum::extract::DefaultBodyLimit::max(\n628\t config.server.max_body_bytes as usize,\n629\t ))\n630\t .layer(axum::Extension(state.admin.config.clone()))\n631\t .layer(axum::Extension(std::sync::Arc::new(state.admin.clone())))\n632\t .layer(axum::middleware::from_fn_with_state(\n633\t state.auth.clone(),\n634\t auth::auth_middleware,\n635\t ))\n636\t .layer(axum::middleware::from_fn_with_state(\n637\t auth::CsrfState {\n638\t auth: state.auth.clone(),\n639\t redis_store: state.redis_store.clone(),\n640\t },\n641\t auth::csrf_middleware,\n642\t ))\n643\t .with_state(state.clone());\n644\t\n645\t let main_addr: SocketAddr = format!(\"{}:{}\", config.server.bind, config.server.port)\n646\t .parse()\n647\t .map_err(|e| anyhow::anyhow!(\"Invalid bind address: {}\", e))?;\n648\t let metrics_addr: SocketAddr = SocketAddr::from(([0, 0, 0, 0], 9090));\n649\t\n650\t info!(\n651\t main_addr = %main_addr,\n652\t metrics_addr = %metrics_addr,\n653\t \"listening\"\n654\t );\n655\t\n656\t // Create listeners\n657\t let main_listener = tokio::net::TcpListener::bind(main_addr).await?;\n658\t let metrics_listener = tokio::net::TcpListener::bind(metrics_addr).await?;\n659\t\n660\t // Spawn main server with graceful shutdown\n661\t let main_server = axum::serve(main_listener, app)\n662\t .with_graceful_shutdown(shutdown_signal());\n663\t\n664\t // Spawn metrics server with graceful shutdown\n665\t let metrics_app = metrics_router().with_state(state.metrics.clone());\n666\t let metrics_server = axum::serve(metrics_listener, metrics_app)\n667\t .with_graceful_shutdown(shutdown_signal());\n668\t\n669\t // Run both servers concurrently\n670\t let (main_result, metrics_result) = tokio::join!(\n671\t main_server,\n672\t metrics_server\n673\t );\n674\t\n675\t // Check for errors\n676\t if let Err(e) = main_result {\n677\t error!(\"main server error: {}\", e);\n678\t }\n679\t if let Err(e) = metrics_result {\n680\t error!(\"metrics server error: {}\", e);\n681\t }\n682\t\n683\t Ok(())\n684\t}\n685\t\n686\t/// Background health checker - promotes nodes to Active when reachable.\n687\t///\n688\t/// On each tick it also updates the Prometheus metrics for node health,\n689\t/// shard coverage, shard distribution, and degraded shard count.\n690\tasync fn run_health_checker(state: admin_endpoints::AppState) {\n691\t let mut interval = tokio::time::interval(Duration::from_millis(\n692\t state.config.health.interval_ms,\n693\t ));\n694\t\n695\t loop {\n696\t interval.tick().await;\n697\t\n698\t let mut topo = state.topology.write().await;\n699\t let mut all_healthy = true;\n700\t\n701\t // Collect node IDs to iterate\n702\t let node_ids: Vec<_> = topo.nodes().map(|n| n.id.clone()).collect();\n703\t\n704\t for node_id in &node_ids {\n705\t // Get current node status\n706\t let current_status = topo.node(node_id).map(|n| n.status);\n707\t\n708\t // Skip nodes that are already Active/Healthy\n709\t if let Some(NodeStatus::Active) | Some(NodeStatus::Healthy) = current_status {\n710\t continue;\n711\t }\n712\t\n713\t // Get node address\n714\t let node_address = match topo.node(node_id) {\n715\t Some(n) => n.address.clone(),\n716\t None => {\n717\t all_healthy = false;\n718\t continue;\n719\t }\n720\t };\n721\t\n722\t // Try to reach the node\n723\t let client = match reqwest::Client::builder()\n724\t .timeout(Duration::from_millis(state.config.health.timeout_ms))\n725\t .build()\n726\t {\n727\t Ok(c) => c,\n728\t Err(_) => {\n729\t all_healthy = false;\n730\t continue;\n731\t }\n732\t };\n733\t\n734\t let url = format!(\"{}/health\", node_address.trim_end_matches('/'));\n735\t let result = client.get(&url).send().await;\n736\t\n737\t if result.is_ok() && result.unwrap().status().is_success() {\n738\t // Node is reachable - promote to Active\n739\t if let Some(node) = topo.node_mut(node_id) {\n740\t let _ = node.transition_to(NodeStatus::Active);\n741\t info!(node_id = %node_id, \"node promoted to Active\");\n742\t }\n743\t } else {\n744\t all_healthy = false;\n745\t }\n746\t }\n747\t\n748\t // Update node health gauges (§10 node metrics)\n749\t for node_id in &node_ids {\n750\t let healthy = topo.node(node_id).map(|n| n.is_healthy()).unwrap_or(false);\n751\t state.metrics.set_node_healthy(node_id.as_str(), healthy);\n752\t }\n753\t\n754\t // Compute and update shard metrics (§10 shard metrics)\n755\t update_shard_metrics(&topo, &state.metrics);\n756\t\n757\t // Update task registry size gauge\n758\t let task_count = state.task_registry.count();\n759\t state.metrics.set_task_registry_size(task_count as f64);\n760\t\n761\t // Sync rebalancer metrics to Prometheus\n762\t state.sync_rebalancer_metrics_to_prometheus().await;\n763\t\n764\t // Mark ready once all configured nodes are reachable\n765\t if all_healthy && !state.config.nodes.is_empty() {\n766\t state.mark_ready().await;\n767\t }\n768\t\n769\t // Update §14.9 resource-pressure metrics\n770\t update_resource_pressure_metrics(&state.metrics);\n771\t\n772\t // Update §13.6 session pinning metrics\n773\t state.session_manager.update_metrics(|count| {\n774\t state.metrics.set_session_active_count(count as u64);\n775\t });\n776\t\n777\t // Prune expired sessions (plan §13.6)\n778\t let pruned = state.session_manager.prune_expired().await;\n779\t if pruned > 0 {\n780\t info!(\n781\t pruned_count = pruned,\n782\t \"pruned expired sessions\"\n783\t );\n784\t }\n785\t }\n786\t}\n787\t\n788\t/// Compute shard coverage, degraded count, and per-node shard distribution\n789\t/// from the current topology and update the corresponding Prometheus gauges.\n790\tfn update_shard_metrics(topo: &Topology, metrics: &middleware::Metrics) {\n791\t let node_map = topo.node_map();\n792\t let mut healthy_shards = 0u64;\n793\t let mut degraded_shards = 0u64;\n794\t\n795\t // Per-node shard count\n796\t let mut node_shard_counts: std::collections::HashMap =\n797\t std::collections::HashMap::new();\n798\t\n799\t for shard_id in 0..topo.shards {\n800\t let mut has_healthy_replica = false;\n801\t for group in topo.groups() {\n802\t let assigned = miroir_core::router::assign_shard_in_group(\n803\t shard_id, group.nodes(), topo.rf(),\n804\t );\n805\t for node_id in &assigned {\n806\t let healthy = node_map\n807\t .get(node_id)\n808\t .map(|n| n.is_healthy())\n809\t .unwrap_or(false);\n810\t if healthy {\n811\t has_healthy_replica = true;\n812\t *node_shard_counts.entry(node_id.clone()).or_insert(0) += 1;\n813\t }\n814\t }\n815\t }\n816\t if has_healthy_replica {\n817\t healthy_shards += 1;\n818\t } else {\n819\t degraded_shards += 1;\n820\t }\n821\t }\n822\t\n823\t let coverage = if topo.shards > 0 {\n824\t healthy_shards as f64 / topo.shards as f64\n825\t } else {\n826\t 1.0\n827\t };\n828\t metrics.set_shard_coverage(coverage);\n829\t metrics.set_degraded_shards(degraded_shards as f64);\n830\t\n831\t for (node_id, count) in &node_shard_counts {\n832\t metrics.set_shard_distribution(node_id.as_str(), *count as f64);\n833\t }\n834\t}\n835\t\n836\t/// Read cgroup v2 memory pressure and update §14.9 resource-pressure gauges.\n837\t///\n838\t/// In Kubernetes each container has its own cgroup; the paths below are the\n839\t/// standard cgroup v2 mount points. If the files don't exist (e.g. local dev\n840\t/// on macOS) the metrics remain at their zero defaults.\n841\tfn update_resource_pressure_metrics(metrics: &middleware::Metrics) {\n842\t // ── Memory pressure ──\n843\t // cgroup v2: /sys/fs/cgroup/memory.current and memory.max\n844\t let mem_current = read_cgroup_metric(\"/sys/fs/cgroup/memory.current\");\n845\t let mem_max = read_cgroup_metric(\"/sys/fs/cgroup/memory.max\");\n846\t\n847\t if let (Some(current), Some(max)) = (mem_current, mem_max) {\n848\t if max > 0 {\n849\t let ratio = current as f64 / max as f64;\n850\t let level = if ratio > 0.90 { 2 } else if ratio > 0.75 { 1 } else { 0 };\n851\t metrics.set_memory_pressure(level);\n852\t }\n853\t }\n854\t\n855\t // ── CPU throttling ──\n856\t // cgroup v2: /sys/fs/cgroup/cpu.stat contains throttle_usec\n857\t if let Ok(contents) = std::fs::read_to_string(\"/sys/fs/cgroup/cpu.stat\") {\n858\t for line in contents.lines() {\n859\t if let Some(rest) = line.strip_prefix(\"throttled_usec \") {\n860\t if let Ok(usec) = rest.trim().parse::() {\n861\t // Report delta — the counter is cumulative, so we report\n862\t // the raw value and let Prometheus handle rate().\n863\t // For simplicity we set the counter to the absolute value\n864\t // (Prometheus counters are monotonic; since this is called\n865\t // periodically, we just inc by the new delta).\n866\t // Actually, the metric is a Counter, so we can only inc it.\n867\t // We'll read the previous throttled value from a thread-local.\n868\t // Simpler approach: just report the current throttle time\n869\t // as a one-shot increment if non-zero.\n870\t metrics.inc_cpu_throttled_seconds(usec / 1_000_000.0);\n871\t }\n872\t }\n873\t }\n874\t }\n875\t\n876\t // ── Peer pod count and leader status ──\n877\t // Peer pod count is now set by peer discovery refresh loop (plan §14.5).\n878\t // Leader election is not yet implemented (plan §14.5 Mode B).\n879\t // Owned shards count will be set by Mode A rendezvous (plan §14.5).\n880\t metrics.set_leader(true);\n881\t metrics.set_owned_shards_count(0);\n882\t}\n883\t\n884\t/// Read a single integer value from a cgroup pseudo-file.\n885\tfn read_cgroup_metric(path: &str) -> Option {\n886\t std::fs::read_to_string(path)\n887\t .ok()\n888\t .and_then(|s| s.trim().parse::().ok())\n889\t}\n890\t\n891\t/// Graceful shutdown signal handler.\n892\tasync fn shutdown_signal() {\n893\t let ctrl_c = async {\n894\t signal::ctrl_c()\n895\t .await\n896\t .expect(\"failed to install Ctrl+C handler\");\n897\t };\n898\t\n899\t #[cfg(unix)]\n900\t let terminate = async {\n901\t signal::unix::signal(signal::unix::SignalKind::terminate())\n902\t .expect(\"failed to install signal handler\")\n903\t .recv()\n904\t .await;\n905\t };\n906\t\n907\t #[cfg(not(unix))]\n908\t let terminate = std::future::pending::<()>;\n909\t\n910\t tokio::select! {\n911\t _ = ctrl_c => {},\n912\t _ = terminate => {},\n913\t }\n914\t\n915\t info!(\"shutdown signal received, draining in-flight requests...\");\n916\t\n917\t // Shutdown OpenTelemetry to flush any pending traces\n918\t otel::shutdown_otel();\n919\t}\n920\t"}]},"parent_tool_use_id":null,"session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"90930c02-3504-4c2e-a1e1-71e282cb6a1e","timestamp":"2026-05-23T06:38:34.537Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/crates/miroir-proxy/src/main.rs","content":"use axum::{\n extract::FromRef,\n routing::{get, post},\n Router,\n};\nuse miroir_core::{\n config::MiroirConfig,\n peer_discovery::PeerDiscovery,\n rebalancer_worker::{RebalancerWorker, RebalancerWorkerConfig, TopologyChangeEvent},\n task_pruner,\n topology::{NodeStatus, Topology},\n};\nuse std::net::SocketAddr;\nuse std::time::Duration;\nuse tokio::signal;\nuse tracing::{error, info};\nuse tracing_subscriber::{EnvFilter, layer::SubscriberExt, registry, util::SubscriberInitExt};\n\nmod admin_session;\nmod auth;\nmod client;\nmod middleware;\nmod otel;\nmod routes;\nmod scoped_key_rotation;\n\nuse admin_session::SealKey;\nuse auth::AuthState;\nuse miroir_core::{\n canary::{CanaryAssertion, CanaryRunner, CapturedQuery, QueryCapture, SearchQuery, SearchResponse},\n task_store::TaskStore,\n};\nuse middleware::{Metrics, metrics_router, TelemetryState};\nuse routes::{\n admin, admin_endpoints, explain, health, indexes, keys, multi_search, search, settings, tasks, version,\n};\nuse scoped_key_rotation::ScopedKeyRotationState;\nuse std::sync::Arc;\n\n/// Unified application state containing all shared state.\n#[derive(Clone)]\nstruct UnifiedState {\n auth: AuthState,\n metrics: Metrics,\n admin: admin_endpoints::AppState,\n pod_id: String,\n redis_store: Option,\n query_capture: Arc,\n peer_discovery: Option>,\n}\n\nimpl UnifiedState {\n fn new(config: MiroirConfig) -> Self {\n let metrics = Metrics::new(&config);\n\n let master_key = std::env::var(\"MIROIR_MASTER_KEY\")\n .unwrap_or_else(|_| config.master_key.clone());\n\n let admin_key = std::env::var(\"MIROIR_ADMIN_API_KEY\")\n .unwrap_or_else(|_| config.admin.api_key.clone());\n\n let jwt_primary = if config.search_ui.enabled {\n std::env::var(&config.search_ui.auth.jwt_secret_env).ok()\n } else {\n None\n };\n\n let jwt_previous = std::env::var(&config.search_ui.auth.jwt_secret_previous_env)\n .ok()\n .filter(|v| !v.is_empty());\n\n let seal_key = SealKey::from_env_or_generate();\n\n // Set the key-generated gauge before constructing AuthState\n // so the metric is accurate from the first scrape.\n metrics.admin_session_key_generated().set(if seal_key.is_generated() { 1.0 } else { 0.0 });\n\n let pod_id = std::env::var(\"POD_NAME\").unwrap_or_else(|_| \"unknown\".to_string());\n let namespace = std::env::var(\"POD_NAMESPACE\").unwrap_or_else(|_| \"default\".to_string());\n\n // Create peer discovery instance (plan §14.5)\n // Only enabled when running in Kubernetes (POD_NAME is set to a real pod name)\n let peer_discovery = if pod_id != \"unknown\" {\n Some(Arc::new(PeerDiscovery::new(\n pod_id.clone(),\n namespace,\n config.peer_discovery.service_name.clone(),\n )))\n } else {\n None\n };\n\n // Create Redis task store if backend is redis (must happen before AppState\n // so redis_store and pod_id are available to admin endpoints).\n let redis_store = if config.task_store.backend == \"redis\" && !config.task_store.url.is_empty() {\n let url = config.task_store.url.clone();\n Some(\n tokio::task::block_in_place(|| {\n tokio::runtime::Handle::current().block_on(\n miroir_core::task_store::RedisTaskStore::open(&url)\n )\n })\n .expect(\"Failed to connect to Redis for scoped key rotation\"),\n )\n } else {\n None\n };\n\n let auth = AuthState {\n master_key,\n admin_key: admin_key.clone(),\n jwt_primary,\n jwt_previous,\n seal_key: seal_key.clone(),\n revoked_sessions: std::sync::Arc::new(dashmap::DashMap::new()),\n admin_session_revoked_total: metrics.admin_session_revoked_total(),\n };\n\n let admin = admin_endpoints::AppState::with_redis(\n config.clone(),\n metrics.clone(),\n redis_store.clone(),\n pod_id.clone(),\n seal_key.clone(),\n );\n\n Self {\n auth,\n metrics,\n admin,\n pod_id,\n redis_store,\n query_capture: Arc::new(QueryCapture::new(1000)),\n peer_discovery,\n }\n }\n}\n\n// Implement FromRef so that admin_endpoints::AppState can be extracted from UnifiedState\nimpl FromRef for admin_endpoints::AppState {\n fn from_ref(state: &UnifiedState) -> Self {\n Self {\n config: state.admin.config.clone(),\n topology: state.admin.topology.clone(),\n ready: state.admin.ready.clone(),\n metrics: state.admin.metrics.clone(),\n version_state: state.admin.version_state.clone(),\n task_registry: state.admin.task_registry.clone(),\n redis_store: state.redis_store.clone(),\n task_store: state.admin.task_store.clone(),\n pod_id: state.pod_id.clone(),\n seal_key: state.auth.seal_key.clone(),\n local_rate_limiter: admin_endpoints::LocalAdminRateLimiter::new(),\n local_search_ui_rate_limiter: admin_endpoints::LocalSearchUiRateLimiter::new(),\n rebalancer: state.admin.rebalancer.clone(),\n migration_coordinator: state.admin.migration_coordinator.clone(),\n rebalancer_worker: state.admin.rebalancer_worker.clone(),\n rebalancer_metrics: state.admin.rebalancer_metrics.clone(),\n previous_docs_migrated: state.admin.previous_docs_migrated.clone(),\n settings_broadcast: state.admin.settings_broadcast.clone(),\n drift_reconciler: state.admin.drift_reconciler.clone(),\n session_manager: state.admin.session_manager.clone(),\n alias_registry: state.admin.alias_registry.clone(),\n }\n }\n}\n\n// Implement FromRef so that TelemetryState can be extracted from UnifiedState\nimpl FromRef for TelemetryState {\n fn from_ref(state: &UnifiedState) -> Self {\n TelemetryState {\n metrics: state.metrics.clone(),\n pod_id: state.pod_id.clone(),\n }\n }\n}\n\n// Implement FromRef so that CsrfState can be extracted from UnifiedState\nimpl FromRef for auth::CsrfState {\n fn from_ref(state: &UnifiedState) -> Self {\n auth::CsrfState {\n auth: state.auth.clone(),\n redis_store: state.redis_store.clone(),\n }\n }\n}\n\n// Implement FromRef so that routes::aliases::AliasState can be extracted from UnifiedState\nimpl FromRef for routes::aliases::AliasState {\n fn from_ref(state: &UnifiedState) -> Self {\n Self {\n config: state.admin.config.clone(),\n task_store: state.admin.task_store.clone(),\n metrics: state.metrics.clone(),\n }\n }\n}\n\n// Implement FromRef so that routes::explain::ExplainState can be extracted from UnifiedState\nimpl FromRef for routes::explain::ExplainState {\n fn from_ref(state: &UnifiedState) -> Self {\n Self {\n config: state.admin.config.clone(),\n topology: state.admin.topology.clone(),\n }\n }\n}\n\n// Implement FromRef so that routes::multi_search::MultiSearchState can be extracted from UnifiedState\nimpl FromRef for routes::multi_search::MultiSearchState {\n fn from_ref(state: &UnifiedState) -> Self {\n Self {\n config: state.admin.config.clone(),\n topology: state.admin.topology.clone(),\n node_master_key: state.admin.config.master_key.clone(),\n metrics: state.metrics.clone(),\n alias_registry: state.admin.alias_registry.clone(),\n }\n }\n}\n\n// Implement FromRef so that routes::canary::CanaryState can be extracted from UnifiedState\nimpl FromRef for routes::canary::CanaryState {\n fn from_ref(state: &UnifiedState) -> Self {\n // Canary routes require Redis task store\n let redis_store = state.redis_store.clone()\n .expect(\"Canary routes require Redis task store (task_store.backend: redis)\");\n let store: Arc = Arc::from(redis_store);\n Self {\n store,\n capture: state.query_capture.clone(),\n }\n }\n}\n\n#[tokio::main]\nasync fn main() -> anyhow::Result<()> {\n // Load configuration (file → env → CLI overlay)\n let config = MiroirConfig::load()\n .map_err(|e| anyhow::anyhow!(\"Failed to load config: {}\", e))?;\n\n // Initialize structured JSON logging (plan §10 format)\n // Fields on every line: timestamp, level, target, message, pod_id\n // Per-request fields (request_id) are added by telemetry middleware span.\n let filter = EnvFilter::try_from_default_env()\n .unwrap_or_else(|_| EnvFilter::new(\"info\"));\n\n let pod_id = std::env::var(\"POD_NAME\").unwrap_or_else(|_| \"unknown\".to_string());\n\n // Build subscriber - conditionally add OTel layer\n // Note: We rebuild the layers in each branch because the types differ\n // OTel layer must be applied to the bare registry first\n if let Some(otel_layer) = otel::init_otel_layer(&config) {\n let json_layer = tracing_subscriber::fmt::layer()\n .json()\n .flatten_event(true)\n .with_target(true)\n .with_current_span(true)\n .with_span_list(false);\n // Apply OTel layer to registry first, then add filter and json layer\n registry()\n .with(otel_layer)\n .with(filter)\n .with(json_layer)\n .init();\n } else {\n let json_layer = tracing_subscriber::fmt::layer()\n .json()\n .flatten_event(true)\n .with_target(true)\n .with_current_span(true)\n .with_span_list(false);\n registry()\n .with(filter)\n .with(json_layer)\n .init();\n }\n\n // Set pod_id as a global default field so it appears on every log line.\n // This is done via a separate info span that is entered once and never\n // left — its fields propagate to all child spans and events.\n let _pod_span = tracing::info_span!(\"runtime\", pod_id = %pod_id).entered();\n\n info!(\n shards = config.shards,\n replication_factor = config.replication_factor,\n replica_groups = config.replica_groups,\n \"miroir-proxy starting\"\n );\n\n // Validate critical secrets at startup (plan §9: \"orchestrator refuses to\n // start the search UI without it\").\n if config.search_ui.enabled {\n let jwt_env = &config.search_ui.auth.jwt_secret_env;\n match std::env::var(jwt_env) {\n Ok(v) if !v.is_empty() => {}\n _ => {\n anyhow::bail!(\n \"search_ui is enabled but {} is not set — refusing to start. \\\n Either set the env var or disable search_ui (search_ui.enabled: false)\",\n jwt_env\n );\n }\n }\n }\n\n // Build unified state\n let state = UnifiedState::new(config.clone());\n\n // Start health checker background task\n let health_checker_state = state.admin.clone();\n tokio::spawn(async move {\n run_health_checker(health_checker_state).await;\n });\n\n // Start rebalancer worker background task (plan §4)\n if let Some(ref worker) = state.admin.rebalancer_worker {\n let worker = worker.clone();\n let pod_id = state.pod_id.clone();\n tokio::spawn(async move {\n info!(\n pod_id = %pod_id,\n \"rebalancer worker task starting\"\n );\n // Load any persisted rebalance jobs from previous runs\n if let Err(e) = worker.load_persisted_jobs().await {\n error!(error = %e, \"failed to load persisted rebalance jobs\");\n }\n worker.run().await;\n error!(\"rebalancer worker task exited unexpectedly\");\n });\n } else {\n info!(\"rebalancer worker not available (no task store configured)\");\n }\n\n // Start scoped key rotation background task (requires Redis)\n if let Some(ref redis) = state.redis_store {\n let rotation_state = ScopedKeyRotationState {\n config: state.admin.config.clone(),\n redis: redis.clone(),\n pod_id: state.pod_id.clone(),\n };\n tokio::spawn(async move {\n scoped_key_rotation::run_scoped_key_rotator(rotation_state).await;\n });\n\n // Start admin session revocation Pub/Sub subscriber (plan §9).\n // When any pod revokes a session (logout), the session ID is published\n // to `miroir:admin_session:revoked`. Every pod subscribes and adds the\n // ID to its in-memory DashMap, ensuring revoked cookies are rejected\n // across all pods within milliseconds.\n let revoked_sessions = state.auth.revoked_sessions.clone();\n let revoked_total = state.auth.admin_session_revoked_total.clone();\n let redis_url = config.task_store.url.clone();\n let key_prefix = redis.key_prefix().to_string();\n tokio::spawn(async move {\n info!(\"starting admin session revocation subscriber\");\n if let Err(e) = miroir_core::task_store::RedisTaskStore::subscribe_session_revocations(\n &redis_url,\n &key_prefix,\n move |session_id: String| {\n revoked_sessions.insert(session_id, ());\n revoked_total.inc();\n },\n )\n .await\n {\n error!(error = %e, \"admin session revocation subscriber exited with error\");\n }\n });\n }\n\n // Load aliases from task store on startup (plan §13.7)\n // Aliases must be loaded before any request routing to ensure consistent resolution\n if let Some(ref task_store) = state.admin.task_store {\n let alias_registry = state.admin.alias_registry.clone();\n let store = task_store.clone();\n tokio::spawn(async move {\n info!(\"loading aliases from task store\");\n match alias_registry.sync_from_store(&*store).await {\n Ok(()) => {\n let count = alias_registry.list().await.len();\n info!(count, \"aliases loaded successfully\");\n }\n Err(e) => {\n error!(error = %e, \"failed to load aliases from task store\");\n }\n }\n });\n } else {\n info!(\"alias loading skipped (no task store configured)\");\n }\n\n // Start drift reconciler background task (plan §13.5)\n // Uses the drift_reconciler from AppState which is already configured\n if let Some(ref drift_reconciler) = state.admin.drift_reconciler {\n let drift_reconciler = drift_reconciler.clone();\n tokio::spawn(async move {\n info!(\"drift reconciler started\");\n drift_reconciler.run().await;\n error!(\"drift reconciler exited unexpectedly\");\n });\n } else {\n info!(\"drift reconciler not available (no task store configured)\");\n }\n\n // Start peer discovery refresh loop (plan §14.5)\n // Periodically performs SRV lookups to discover peer pods\n if let Some(ref peer_discovery) = state.peer_discovery {\n let peer_discovery = peer_discovery.clone();\n let metrics = state.metrics.clone();\n let refresh_interval_s = config.peer_discovery.refresh_interval_s;\n tokio::spawn(async move {\n let mut interval = tokio::time::interval(Duration::from_secs(refresh_interval_s));\n info!(\n interval_s = refresh_interval_s,\n \"peer discovery refresh loop started\"\n );\n loop {\n interval.tick().await;\n match peer_discovery.refresh().await {\n Ok(peer_set) => {\n let count = peer_set.len() as u64;\n info!(\n peer_count = count,\n \"peer discovery refresh completed\"\n );\n metrics.set_peer_pod_count(count);\n }\n Err(e) => {\n error!(error = %e, \"peer discovery refresh failed\");\n }\n }\n }\n });\n } else {\n info!(\"peer discovery disabled (not running in Kubernetes)\");\n }\n\n // Start task registry TTL pruner background task (plan §4, Phase 3)\n // Runs on single-pod with advisory lock; Phase 6 §14.5 Mode A replaces with rendezvous\n if let Some(ref store) = state.admin.task_store {\n let store = store.clone();\n let pruner_config = config.task_registry.clone();\n tokio::spawn(async move {\n // The pruner runs in its own thread via spawn_pruner\n let _pruner_handle = task_pruner::spawn_pruner(store, pruner_config);\n // The handle is dropped here only on process exit\n info!(\"task registry TTL pruner started\");\n // Keep this task alive forever\n std::future::pending::<()>().await;\n });\n } else {\n info!(\"task registry TTL pruner not available (no task store)\");\n }\n\n // Start canary runner background task (plan §13.18)\n // Only enabled when canary_runner.enabled = true and Redis is available\n if config.canary_runner.enabled {\n if let Some(ref redis) = state.redis_store {\n let store: Arc = Arc::from(redis.clone());\n let canary_config = config.canary_runner.clone();\n\n // Clone config values for the search executor\n let search_config = config.clone();\n let search_executor: miroir_core::canary::SearchExecutor = Arc::new(\n move |index_uid: &str, query: &SearchQuery| -> std::pin::Pin> + Send>> {\n let index_uid = index_uid.to_string();\n let query = query.clone();\n let config = search_config.clone();\n\n Box::pin(async move {\n // For canary queries, we execute against the first available healthy node\n let node_addresses: Vec<_> = config.nodes.iter()\n .map(|n| n.address.clone())\n .collect();\n\n for address in node_addresses {\n let client = match reqwest::Client::builder()\n .timeout(std::time::Duration::from_millis(config.scatter.node_timeout_ms))\n .build()\n {\n Ok(c) => c,\n Err(_) => continue,\n };\n\n let url = format!(\"{}/indexes/{}/search\", address.trim_end_matches('/'), index_uid);\n\n // Build the search request body\n let mut body = match serde_json::to_value(&query) {\n Ok(v) => v,\n Err(e) => return Err(miroir_core::error::MiroirError::InvalidRequest(format!(\"Failed to serialize query: {}\", e))),\n };\n\n // Add limit to avoid large responses for canary queries\n if !body.get(\"limit\").and_then(|v| v.as_u64()).is_some() {\n body[\"limit\"] = serde_json::json!(20);\n }\n\n let response = match client.post(&url)\n .header(\"Authorization\", format!(\"Bearer {}\", config.node_master_key))\n .json(&body)\n .send()\n .await\n {\n Ok(r) => r,\n Err(_) => continue,\n };\n\n if response.status().is_success() {\n if let Ok(text) = response.text().await {\n if let Ok(search_response) = serde_json::from_str::(&text) {\n return Ok(search_response);\n }\n }\n }\n }\n\n // All nodes failed\n Err(miroir_core::error::MiroirError::Topology(\n \"All nodes failed for canary query\".to_string()\n ))\n })\n }\n );\n\n // Create metrics emitter callback\n let metrics_for_canary = state.metrics.clone();\n let metrics_emitter: miroir_core::canary::MetricsEmitter = Arc::new(\n move |result| {\n use miroir_core::canary::CanaryStatus;\n let result_str = match result.status {\n CanaryStatus::Passed => \"passed\",\n CanaryStatus::Failed => \"failed\",\n CanaryStatus::Error => \"error\",\n };\n metrics_for_canary.inc_canary_runs(&result.canary_id, result_str);\n metrics_for_canary.observe_canary_latency_ms(&result.canary_id, result.latency_ms as f64);\n\n for failure in &result.failed_assertions {\n metrics_for_canary.inc_canary_assertion_failures(&result.canary_id, &failure.assertion_type);\n }\n }\n );\n\n // Create settings version checker callback\n let store_for_version = store.clone();\n let version_config = config.clone();\n let settings_version_checker: miroir_core::canary::SettingsVersionChecker = Arc::new(\n move |index_uid: &str| -> Option {\n // Try to get the settings version from the task store\n let node_ids: Vec = version_config.nodes.iter()\n .map(|n| n.id.clone())\n .collect();\n\n let mut min_version: Option = None;\n for node_id in node_ids {\n if let Ok(Some(row)) = store_for_version.get_node_settings_version(index_uid, &node_id) {\n match min_version {\n None => min_version = Some(row.version),\n Some(current) if row.version < current => min_version = Some(row.version),\n _ => {}\n }\n }\n }\n min_version\n }\n );\n\n // Create and start the canary runner\n let runner = CanaryRunner::new(\n store,\n canary_config.max_concurrent_canaries as usize,\n canary_config.run_history_per_canary as usize,\n search_executor,\n metrics_emitter,\n settings_version_checker,\n );\n\n tokio::spawn(async move {\n info!(\"canary runner started\");\n if let Err(e) = runner.start().await {\n error!(\"canary runner exited: {}\", e);\n }\n });\n } else {\n info!(\"canary runner enabled but Redis not available - skipping\");\n }\n }\n\n // Build the main app router with UnifiedState\n let app = Router::new()\n .route(\"/health\", get(health::get_health))\n .route(\"/version\", get(version::get_version::))\n .route(\"/stats\", get(indexes::global_stats_handler))\n .route(\"/multi-search\", post(multi_search::multi_search::)) // §13.11\n .nest(\"/_miroir\", admin::router::())\n .nest(\"/indexes\", indexes::router::())\n .nest(\"/keys\", keys::router::())\n .nest(\"/search\", search::router::())\n .nest(\"/settings\", settings::router::())\n .nest(\"/tasks\", tasks::router::())\n // IMPORTANT: Layer order matters! Last layer() call = outermost = runs first.\n // The middleware stack (from outermost to innermost):\n // 1. csrf_middleware - runs first\n // 2. auth_middleware\n // 3. Extension layers\n // 4. session_pinning_middleware - extracts X-Miroir-Session header\n // 5. request_id_middleware - sets X-Request-Id header\n // 6. telemetry_middleware - reads X-Request-Id, creates tracing span with request_id field\n // The span's request_id field propagates to all child log events via with_current_span(true)\n //\n // To achieve this order, we add layers in REVERSE (last call = outermost):\n .layer(axum::middleware::from_fn_with_state(\n TelemetryState {\n metrics: state.metrics.clone(),\n pod_id: state.pod_id.clone(),\n },\n middleware::telemetry_middleware,\n ))\n .layer(axum::middleware::from_fn(\n middleware::request_id_middleware,\n ))\n .layer(axum::middleware::from_fn(\n middleware::session_pinning_middleware,\n ))\n .layer(axum::extract::DefaultBodyLimit::max(\n config.server.max_body_bytes as usize,\n ))\n .layer(axum::Extension(state.admin.config.clone()))\n .layer(axum::Extension(std::sync::Arc::new(state.admin.clone())))\n .layer(axum::middleware::from_fn_with_state(\n state.auth.clone(),\n auth::auth_middleware,\n ))\n .layer(axum::middleware::from_fn_with_state(\n auth::CsrfState {\n auth: state.auth.clone(),\n redis_store: state.redis_store.clone(),\n },\n auth::csrf_middleware,\n ))\n .with_state(state.clone());\n\n let main_addr: SocketAddr = format!(\"{}:{}\", config.server.bind, config.server.port)\n .parse()\n .map_err(|e| anyhow::anyhow!(\"Invalid bind address: {}\", e))?;\n let metrics_addr: SocketAddr = SocketAddr::from(([0, 0, 0, 0], 9090));\n\n info!(\n main_addr = %main_addr,\n metrics_addr = %metrics_addr,\n \"listening\"\n );\n\n // Create listeners\n let main_listener = tokio::net::TcpListener::bind(main_addr).await?;\n let metrics_listener = tokio::net::TcpListener::bind(metrics_addr).await?;\n\n // Spawn main server with graceful shutdown\n let main_server = axum::serve(main_listener, app)\n .with_graceful_shutdown(shutdown_signal());\n\n // Spawn metrics server with graceful shutdown\n let metrics_app = metrics_router().with_state(state.metrics.clone());\n let metrics_server = axum::serve(metrics_listener, metrics_app)\n .with_graceful_shutdown(shutdown_signal());\n\n // Run both servers concurrently\n let (main_result, metrics_result) = tokio::join!(\n main_server,\n metrics_server\n );\n\n // Check for errors\n if let Err(e) = main_result {\n error!(\"main server error: {}\", e);\n }\n if let Err(e) = metrics_result {\n error!(\"metrics server error: {}\", e);\n }\n\n Ok(())\n}\n\n/// Background health checker - promotes nodes to Active when reachable.\n///\n/// On each tick it also updates the Prometheus metrics for node health,\n/// shard coverage, shard distribution, and degraded shard count.\nasync fn run_health_checker(state: admin_endpoints::AppState) {\n let mut interval = tokio::time::interval(Duration::from_millis(\n state.config.health.interval_ms,\n ));\n\n loop {\n interval.tick().await;\n\n let mut topo = state.topology.write().await;\n let mut all_healthy = true;\n\n // Collect node IDs to iterate\n let node_ids: Vec<_> = topo.nodes().map(|n| n.id.clone()).collect();\n\n for node_id in &node_ids {\n // Get current node status\n let current_status = topo.node(node_id).map(|n| n.status);\n\n // Skip nodes that are already Active/Healthy\n if let Some(NodeStatus::Active) | Some(NodeStatus::Healthy) = current_status {\n continue;\n }\n\n // Get node address\n let node_address = match topo.node(node_id) {\n Some(n) => n.address.clone(),\n None => {\n all_healthy = false;\n continue;\n }\n };\n\n // Try to reach the node\n let client = match reqwest::Client::builder()\n .timeout(Duration::from_millis(state.config.health.timeout_ms))\n .build()\n {\n Ok(c) => c,\n Err(_) => {\n all_healthy = false;\n continue;\n }\n };\n\n let url = format!(\"{}/health\", node_address.trim_end_matches('/'));\n let result = client.get(&url).send().await;\n\n if result.is_ok() && result.unwrap().status().is_success() {\n // Node is reachable - promote to Active\n if let Some(node) = topo.node_mut(node_id) {\n let _ = node.transition_to(NodeStatus::Active);\n info!(node_id = %node_id, \"node promoted to Active\");\n }\n } else {\n all_healthy = false;\n }\n }\n\n // Update node health gauges (§10 node metrics)\n for node_id in &node_ids {\n let healthy = topo.node(node_id).map(|n| n.is_healthy()).unwrap_or(false);\n state.metrics.set_node_healthy(node_id.as_str(), healthy);\n }\n\n // Compute and update shard metrics (§10 shard metrics)\n update_shard_metrics(&topo, &state.metrics);\n\n // Update task registry size gauge\n let task_count = state.task_registry.count();\n state.metrics.set_task_registry_size(task_count as f64);\n\n // Sync rebalancer metrics to Prometheus\n state.sync_rebalancer_metrics_to_prometheus().await;\n\n // Mark ready once all configured nodes are reachable\n if all_healthy && !state.config.nodes.is_empty() {\n state.mark_ready().await;\n }\n\n // Update §14.9 resource-pressure metrics\n update_resource_pressure_metrics(&state.metrics);\n\n // Update §13.6 session pinning metrics\n state.session_manager.update_metrics(|count| {\n state.metrics.set_session_active_count(count as u64);\n });\n\n // Prune expired sessions (plan §13.6)\n let pruned = state.session_manager.prune_expired().await;\n if pruned > 0 {\n info!(\n pruned_count = pruned,\n \"pruned expired sessions\"\n );\n }\n }\n}\n\n/// Compute shard coverage, degraded count, and per-node shard distribution\n/// from the current topology and update the corresponding Prometheus gauges.\nfn update_shard_metrics(topo: &Topology, metrics: &middleware::Metrics) {\n let node_map = topo.node_map();\n let mut healthy_shards = 0u64;\n let mut degraded_shards = 0u64;\n\n // Per-node shard count\n let mut node_shard_counts: std::collections::HashMap =\n std::collections::HashMap::new();\n\n for shard_id in 0..topo.shards {\n let mut has_healthy_replica = false;\n for group in topo.groups() {\n let assigned = miroir_core::router::assign_shard_in_group(\n shard_id, group.nodes(), topo.rf(),\n );\n for node_id in &assigned {\n let healthy = node_map\n .get(node_id)\n .map(|n| n.is_healthy())\n .unwrap_or(false);\n if healthy {\n has_healthy_replica = true;\n *node_shard_counts.entry(node_id.clone()).or_insert(0) += 1;\n }\n }\n }\n if has_healthy_replica {\n healthy_shards += 1;\n } else {\n degraded_shards += 1;\n }\n }\n\n let coverage = if topo.shards > 0 {\n healthy_shards as f64 / topo.shards as f64\n } else {\n 1.0\n };\n metrics.set_shard_coverage(coverage);\n metrics.set_degraded_shards(degraded_shards as f64);\n\n for (node_id, count) in &node_shard_counts {\n metrics.set_shard_distribution(node_id.as_str(), *count as f64);\n }\n}\n\n/// Read cgroup v2 memory pressure and update §14.9 resource-pressure gauges.\n///\n/// In Kubernetes each container has its own cgroup; the paths below are the\n/// standard cgroup v2 mount points. If the files don't exist (e.g. local dev\n/// on macOS) the metrics remain at their zero defaults.\nfn update_resource_pressure_metrics(metrics: &middleware::Metrics) {\n // ── Memory pressure ──\n // cgroup v2: /sys/fs/cgroup/memory.current and memory.max\n let mem_current = read_cgroup_metric(\"/sys/fs/cgroup/memory.current\");\n let mem_max = read_cgroup_metric(\"/sys/fs/cgroup/memory.max\");\n\n if let (Some(current), Some(max)) = (mem_current, mem_max) {\n if max > 0 {\n let ratio = current as f64 / max as f64;\n let level = if ratio > 0.90 { 2 } else if ratio > 0.75 { 1 } else { 0 };\n metrics.set_memory_pressure(level);\n }\n }\n\n // ── CPU throttling ──\n // cgroup v2: /sys/fs/cgroup/cpu.stat contains throttle_usec\n if let Ok(contents) = std::fs::read_to_string(\"/sys/fs/cgroup/cpu.stat\") {\n for line in contents.lines() {\n if let Some(rest) = line.strip_prefix(\"throttled_usec \") {\n if let Ok(usec) = rest.trim().parse::() {\n // Report delta — the counter is cumulative, so we report\n // the raw value and let Prometheus handle rate().\n // For simplicity we set the counter to the absolute value\n // (Prometheus counters are monotonic; since this is called\n // periodically, we just inc by the new delta).\n // Actually, the metric is a Counter, so we can only inc it.\n // We'll read the previous throttled value from a thread-local.\n // Simpler approach: just report the current throttle time\n // as a one-shot increment if non-zero.\n metrics.inc_cpu_throttled_seconds(usec / 1_000_000.0);\n }\n }\n }\n }\n\n // ── Peer pod count and leader status ──\n // Peer pod count is now set by peer discovery refresh loop (plan §14.5).\n // Leader election is not yet implemented (plan §14.5 Mode B).\n // Owned shards count will be set by Mode A rendezvous (plan §14.5).\n metrics.set_leader(true);\n metrics.set_owned_shards_count(0);\n}\n\n/// Read a single integer value from a cgroup pseudo-file.\nfn read_cgroup_metric(path: &str) -> Option {\n std::fs::read_to_string(path)\n .ok()\n .and_then(|s| s.trim().parse::().ok())\n}\n\n/// Graceful shutdown signal handler.\nasync fn shutdown_signal() {\n let ctrl_c = async {\n signal::ctrl_c()\n .await\n .expect(\"failed to install Ctrl+C handler\");\n };\n\n #[cfg(unix)]\n let terminate = async {\n signal::unix::signal(signal::unix::SignalKind::terminate())\n .expect(\"failed to install signal handler\")\n .recv()\n .await;\n };\n\n #[cfg(not(unix))]\n let terminate = std::future::pending::<()>;\n\n tokio::select! {\n _ = ctrl_c => {},\n _ = terminate => {},\n }\n\n info!(\"shutdown signal received, draining in-flight requests...\");\n\n // Shutdown OpenTelemetry to flush any pending traces\n otel::shutdown_otel();\n}\n","numLines":920,"startLine":1,"totalLines":920}}} +{"type":"system","subtype":"status","status":"requesting","uuid":"b3da729e-2da1-4374-8923-5068ad74db4e","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39"} 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Admin API endpoints for topology, readiness, shards, and metrics.\n2\t\n3\tuse axum::{\n4\t extract::{FromRef, Path, State},\n5\t http::{HeaderMap, StatusCode},\n6\t Json,\n7\t response::{IntoResponse, Response},\n8\t};\n9\tuse miroir_core::{\n10\t config::MiroirConfig,\n11\t migration::{MigrationConfig, MigrationCoordinator},\n12\t rebalancer::{MigrationExecutor, Rebalancer, RebalancerConfig, RebalancerMetrics},\n13\t rebalancer_worker::{RebalancerMetricsCallback, RebalancerWorker, RebalancerWorkerConfig, TopologyChangeEvent},\n14\t router,\n15\t scatter::{DeleteByFilterRequest, FetchDocumentsRequest, FetchDocumentsResponse, WriteRequest},\n16\t task_registry::TaskRegistryImpl,\n17\t task_store::{RedisTaskStore, TaskStore},\n18\t topology::{Node, NodeId, Topology},\n19\t};\n20\tuse rand::RngCore;\n21\tuse serde::{Deserialize, Serialize};\n22\tuse std::collections::HashMap;\n23\tuse std::sync::Arc;\n24\tuse std::time::Duration;\n25\tuse tokio::sync::RwLock;\n26\tuse tracing::{info, error, warn};\n27\tuse reqwest::Client;\n28\t\n29\tuse crate::{\n30\t admin_session::{seal_session, COOKIE_NAME, SealKey},\n31\t client::HttpClient,\n32\t scoped_key_rotation::{self, ScopedKeyRotationState, RotateScopedKeyRequest, RotateScopedKeyResponse},\n33\t};\n34\t\n35\t/// Hash a PII value (IP address) for safe log correlation.\n36\tfn hash_for_log(value: &str) -> String {\n37\t use std::hash::{Hash, Hasher};\n38\t let mut hasher = std::collections::hash_map::DefaultHasher::new();\n39\t value.hash(&mut hasher);\n40\t format!(\"{:016x}\", hasher.finish())\n41\t}\n42\t\n43\t/// Request body for POST /_miroir/admin/login.\n44\t#[derive(Deserialize)]\n45\tpub struct AdminLoginRequest {\n46\t pub admin_key: String,\n47\t}\n48\t\n49\timpl std::fmt::Debug for AdminLoginRequest {\n50\t fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {\n51\t f.debug_struct(\"AdminLoginRequest\")\n52\t .field(\"admin_key\", &\"[redacted]\")\n53\t .finish()\n54\t }\n55\t}\n56\t\n57\t/// Response body for POST /_miroir/admin/login.\n58\t#[derive(Debug, Serialize)]\n59\tpub struct AdminLoginResponse {\n60\t pub success: bool,\n61\t pub message: Option,\n62\t}\n63\t\n64\t/// Version state with cache for fetching Meilisearch version.\n65\t#[derive(Clone)]\n66\tpub struct VersionState {\n67\t pub node_master_key: String,\n68\t pub node_addresses: Vec,\n69\t pub version_cache: Arc>>,\n70\t pub last_cache_update: Arc>>,\n71\t pub cache_ttl_secs: u64,\n72\t}\n73\t\n74\timpl VersionState {\n75\t pub fn new(node_master_key: String, node_addresses: Vec) -> Self {\n76\t Self {\n77\t node_master_key,\n78\t node_addresses,\n79\t version_cache: Arc::new(RwLock::new(None)),\n80\t last_cache_update: Arc::new(RwLock::new(None)),\n81\t cache_ttl_secs: 60,\n82\t }\n83\t }\n84\t\n85\t /// Fetch version from a healthy node, using cache if within TTL.\n86\t pub async fn get_version(&self) -> Result {\n87\t // Check cache first\n88\t {\n89\t let cache = self.version_cache.read().await;\n90\t let last_update = self.last_cache_update.read().await;\n91\t if let (Some(ref cached), Some(last)) = (cache.as_ref(), last_update.as_ref()) {\n92\t if last.elapsed().as_secs() < self.cache_ttl_secs {\n93\t return Ok((**cached).clone());\n94\t }\n95\t }\n96\t }\n97\t\n98\t // Cache miss or expired - fetch from a node\n99\t let client = Client::builder()\n100\t .timeout(Duration::from_secs(2))\n101\t .build()\n102\t .map_err(|_| StatusCode::INTERNAL_SERVER_ERROR)?;\n103\t\n104\t for address in &self.node_addresses {\n105\t let url = format!(\"{}/version\", address.trim_end_matches('/'));\n106\t let response = client\n107\t .get(&url)\n108\t .header(\"Authorization\", format!(\"Bearer {}\", self.node_master_key))\n109\t .send()\n110\t .await;\n111\t\n112\t if let Ok(resp) = response {\n113\t if resp.status().is_success() {\n114\t if let Ok(body) = resp.text().await {\n115\t // Update cache\n116\t *self.version_cache.write().await = Some(body.clone());\n117\t *self.last_cache_update.write().await = Some(std::time::Instant::now());\n118\t return Ok(body);\n119\t }\n120\t }\n121\t }\n122\t }\n123\t\n124\t Err(StatusCode::SERVICE_UNAVAILABLE)\n125\t }\n126\t}\n127\t\n128\t// ---------------------------------------------------------------------------\n129\t// Local Rate Limiter (for single-pod deployments)\n130\t// ---------------------------------------------------------------------------\n131\t\n132\t/// In-memory rate limiter for admin login (local backend only).\n133\t/// Thread-safe using Arc>.\n134\t#[derive(Debug, Clone)]\n135\tpub struct LocalAdminRateLimiter {\n136\t inner: Arc>,\n137\t}\n138\t\n139\t#[derive(Debug, Default)]\n140\tstruct LocalAdminRateLimiterInner {\n141\t /// Map of IP -> (request_timestamps_ms, failed_count, backoff_until_ms)\n142\t state: HashMap,\n143\t}\n144\t\n145\t#[derive(Debug, Default, Clone)]\n146\tstruct LocalRateLimitState {\n147\t /// Timestamps of recent requests (for sliding window)\n148\t request_timestamps_ms: Vec,\n149\t /// Consecutive failed login attempts\n150\t failed_count: u32,\n151\t /// Unix timestamp (ms) when backoff expires\n152\t backoff_until_ms: Option,\n153\t}\n154\t\n155\timpl LocalAdminRateLimiter {\n156\t pub fn new() -> Self {\n157\t Self {\n158\t inner: Arc::new(std::sync::Mutex::new(LocalAdminRateLimiterInner::default())),\n159\t }\n160\t }\n161\t\n162\t /// Check rate limit and exponential backoff.\n163\t /// Returns (allowed, wait_seconds).\n164\t pub fn check(\n165\t &self,\n166\t ip: &str,\n167\t limit: u64,\n168\t window_ms: u64,\n169\t failed_threshold: u32,\n170\t backoff_start_minutes: u64,\n171\t backoff_max_hours: u64,\n172\t ) -> (bool, Option) {\n173\t let mut inner = self.inner.lock().unwrap();\n174\t let now = now_ms();\n175\t let state = inner.state.entry(ip.to_string()).or_default();\n176\t\n177\t // Check if we're in backoff mode\n178\t if let Some(backoff_until) = state.backoff_until_ms {\n179\t if backoff_until > now {\n180\t let wait_seconds = ((backoff_until - now) / 1000) as u64;\n181\t return (false, Some(wait_seconds));\n182\t }\n183\t // Backoff expired, clear it\n184\t state.backoff_until_ms = None;\n185\t }\n186\t\n187\t // Clean old timestamps outside the window\n188\t state.request_timestamps_ms.retain(|&ts| now - ts < window_ms as i64);\n189\t\n190\t // Check if limit exceeded\n191\t if state.request_timestamps_ms.len() >= limit as usize {\n192\t // Enter backoff mode after threshold consecutive failures\n193\t let failed = state.failed_count + 1;\n194\t state.failed_count = failed;\n195\t\n196\t if failed >= failed_threshold {\n197\t let backoff_minutes = backoff_start_minutes * (1u64 << ((failed - failed_threshold) as u64).min(7)); // Cap at 2^7 = 128x\n198\t let backoff_seconds = (backoff_minutes * 60).min(backoff_max_hours * 3600);\n199\t state.backoff_until_ms = Some(now + (backoff_seconds as i64 * 1000));\n200\t return (false, Some(backoff_seconds));\n201\t }\n202\t\n203\t return (false, None);\n204\t }\n205\t\n206\t // Record this request\n207\t state.request_timestamps_ms.push(now);\n208\t (true, None)\n209\t }\n210\t\n211\t /// Reset rate limit and backoff state on successful login.\n212\t pub fn reset(&self, ip: &str) {\n213\t let mut inner = self.inner.lock().unwrap();\n214\t inner.state.remove(ip);\n215\t }\n216\t\n217\t /// Record a failed login attempt (for backoff calculation).\n218\t pub fn record_failure(&self, ip: &str, failed_threshold: u32, backoff_start_minutes: u64, backoff_max_hours: u64) -> Option {\n219\t let mut inner = self.inner.lock().unwrap();\n220\t let now = now_ms();\n221\t let state = inner.state.entry(ip.to_string()).or_default();\n222\t\n223\t state.failed_count += 1;\n224\t\n225\t if state.failed_count >= failed_threshold {\n226\t let backoff_minutes = backoff_start_minutes * (1u64 << ((state.failed_count - failed_threshold) as u64).min(7));\n227\t let backoff_seconds = (backoff_minutes * 60).min(backoff_max_hours * 3600);\n228\t state.backoff_until_ms = Some(now + (backoff_seconds as i64 * 1000));\n229\t return Some(backoff_seconds);\n230\t }\n231\t\n232\t None\n233\t }\n234\t}\n235\t\n236\timpl Default for LocalAdminRateLimiter {\n237\t fn default() -> Self {\n238\t Self::new()\n239\t }\n240\t}\n241\t\n242\t/// In-memory rate limiter for search UI (local backend only).\n243\t/// Thread-safe using Arc>.\n244\t#[derive(Debug, Clone)]\n245\tpub struct LocalSearchUiRateLimiter {\n246\t inner: Arc>,\n247\t}\n248\t\n249\t#[derive(Debug, Default)]\n250\tstruct LocalSearchUiRateLimiterInner {\n251\t /// Map of IP -> request_timestamps_ms\n252\t state: HashMap>,\n253\t}\n254\t\n255\timpl LocalSearchUiRateLimiter {\n256\t pub fn new() -> Self {\n257\t Self {\n258\t inner: Arc::new(std::sync::Mutex::new(LocalSearchUiRateLimiterInner::default())),\n259\t }\n260\t }\n261\t\n262\t /// Check rate limit for search UI.\n263\t /// Returns (allowed, wait_seconds).\n264\t pub fn check(\n265\t &self,\n266\t ip: &str,\n267\t limit: u64,\n268\t window_ms: u64,\n269\t ) -> (bool, Option) {\n270\t let mut inner = self.inner.lock().unwrap();\n271\t let now = now_ms();\n272\t let timestamps = inner.state.entry(ip.to_string()).or_default();\n273\t\n274\t // Clean old timestamps outside the window\n275\t timestamps.retain(|&ts| now - ts < window_ms as i64);\n276\t\n277\t // Check if limit exceeded\n278\t if timestamps.len() >= limit as usize {\n279\t return (false, None);\n280\t }\n281\t\n282\t // Record this request\n283\t timestamps.push(now);\n284\t (true, None)\n285\t }\n286\t}\n287\t\n288\timpl Default for LocalSearchUiRateLimiter {\n289\t fn default() -> Self {\n290\t Self::new()\n291\t }\n292\t}\n293\t\n294\t/// Get current time in milliseconds since Unix epoch.\n295\tfn now_ms() -> i64 {\n296\t std::time::SystemTime::now()\n297\t .duration_since(std::time::UNIX_EPOCH)\n298\t .unwrap_or_default()\n299\t .as_millis() as i64\n300\t}\n301\t\n302\t/// Shared application state for admin endpoints.\n303\t#[derive(Clone)]\n304\tpub struct AppState {\n305\t pub config: Arc,\n306\t pub topology: Arc>,\n307\t pub ready: Arc>,\n308\t pub metrics: super::super::middleware::Metrics,\n309\t pub version_state: VersionState,\n310\t pub task_registry: Arc,\n311\t pub redis_store: Option,\n312\t pub task_store: Option>,\n313\t pub pod_id: String,\n314\t pub seal_key: SealKey,\n315\t pub local_rate_limiter: LocalAdminRateLimiter,\n316\t pub local_search_ui_rate_limiter: LocalSearchUiRateLimiter,\n317\t pub rebalancer: Option>,\n318\t pub migration_coordinator: Option>>,\n319\t pub rebalancer_worker: Option>,\n320\t pub rebalancer_metrics: Arc>,\n321\t /// Track previous documents migrated value for delta calculation.\n322\t pub previous_docs_migrated: Arc,\n323\t /// Two-phase settings broadcast coordinator (§13.5).\n324\t pub settings_broadcast: Arc,\n325\t /// Settings drift reconciler worker (§13.5).\n326\t pub drift_reconciler: Option>,\n327\t /// Session pinning manager (§13.6).\n328\t pub session_manager: Arc,\n329\t /// Alias registry (§13.7).\n330\t pub alias_registry: Arc,\n331\t}\n332\t\n333\timpl AppState {\n334\t pub fn new(\n335\t config: MiroirConfig,\n336\t metrics: super::super::middleware::Metrics,\n337\t seal_key: SealKey,\n338\t ) -> Self {\n339\t Self::with_redis(config, metrics, None, \"unknown\".into(), seal_key)\n340\t }\n341\t\n342\t pub fn with_redis(\n343\t config: MiroirConfig,\n344\t metrics: super::super::middleware::Metrics,\n345\t redis_store: Option,\n346\t pod_id: String,\n347\t seal_key: SealKey,\n348\t ) -> Self {\n349\t // Build initial topology from config\n350\t let mut topology = Topology::new(\n351\t config.shards,\n352\t config.replica_groups,\n353\t config.replication_factor as usize,\n354\t );\n355\t\n356\t for node_config in &config.nodes {\n357\t let node = Node::new(\n358\t NodeId::new(node_config.id.clone()),\n359\t node_config.address.clone(),\n360\t node_config.replica_group,\n361\t );\n362\t // Start nodes in Joining state - health checker will promote to Active\n363\t topology.add_node(node);\n364\t }\n365\t\n366\t let version_state = VersionState::new(\n367\t config.node_master_key.clone(),\n368\t config.nodes.iter().map(|n| n.address.clone()).collect(),\n369\t );\n370\t\n371\t // Select task registry backend based on config\n372\t let task_registry = match config.task_store.backend.as_str() {\n373\t \"redis\" if redis_store.is_some() => {\n374\t let store = redis_store.as_ref().unwrap().clone();\n375\t store.migrate().expect(\"Redis migration failed\");\n376\t TaskRegistryImpl::Redis(Arc::new(store))\n377\t }\n378\t \"sqlite\" if !config.task_store.path.is_empty() => {\n379\t TaskRegistryImpl::sqlite(&config.task_store.path)\n380\t .expect(\"Failed to open SQLite task store\")\n381\t }\n382\t _ => TaskRegistryImpl::in_memory(),\n383\t };\n384\t\n385\t let topology_arc = Arc::new(RwLock::new(topology));\n386\t\n387\t // Initialize rebalancer and migration coordinator\n388\t let rebalancer_config = RebalancerConfig {\n389\t max_concurrent_migrations: config.rebalancer.max_concurrent_migrations,\n390\t migration_timeout_s: config.rebalancer.migration_timeout_s,\n391\t auto_rebalance_on_recovery: config.rebalancer.auto_rebalance_on_recovery,\n392\t migration_batch_size: 1000,\n393\t migration_batch_delay_ms: 100,\n394\t };\n395\t\n396\t let migration_config = MigrationConfig {\n397\t drain_timeout: std::time::Duration::from_secs(30),\n398\t skip_delta_pass: false,\n399\t anti_entropy_enabled: config.anti_entropy.enabled,\n400\t };\n401\t\n402\t let migration_coordinator = Arc::new(RwLock::new(\n403\t MigrationCoordinator::new(migration_config.clone())\n404\t ));\n405\t\n406\t // Create migration executor for actual HTTP document migration\n407\t use miroir_core::rebalancer::HttpMigrationExecutor;\n408\t let migration_executor = Arc::new(HttpMigrationExecutor::new(\n409\t config.node_master_key.clone(),\n410\t config.scatter.node_timeout_ms,\n411\t ));\n412\t\n413\t let rebalancer = Arc::new(Rebalancer::new(\n414\t rebalancer_config.clone(),\n415\t topology_arc.clone(),\n416\t migration_config.clone(),\n417\t ).with_migration_executor(migration_executor));\n418\t\n419\t // Create rebalancer metrics\n420\t let rebalancer_metrics = Arc::new(RwLock::new(RebalancerMetrics::default()));\n421\t\n422\t // Get or create task store for rebalancer worker\n423\t let task_store: Option> = match config.task_store.backend.as_str() {\n424\t \"redis\" => {\n425\t redis_store.as_ref().map(|s| Arc::new(s.clone()) as Arc)\n426\t }\n427\t \"sqlite\" if !config.task_store.path.is_empty() => {\n428\t Some(Arc::new(miroir_core::task_store::SqliteTaskStore::open(\n429\t std::path::Path::new(&config.task_store.path)\n430\t ).expect(\"Failed to open SQLite task store\")) as Arc)\n431\t }\n432\t _ => None,\n433\t };\n434\t\n435\t // Create rebalancer worker if task store is available\n436\t let rebalancer_worker = if let Some(ref store) = task_store {\n437\t let worker_config = RebalancerWorkerConfig {\n438\t max_concurrent_migrations: config.rebalancer.max_concurrent_migrations,\n439\t lease_ttl_secs: 10,\n440\t lease_renewal_interval_ms: 2000,\n441\t migration_batch_size: 1000,\n442\t migration_batch_delay_ms: 100,\n443\t event_channel_capacity: 100,\n444\t };\n445\t\n446\t // Create metrics callback for rebalancer operations\n447\t let metrics_for_worker = metrics.clone();\n448\t let rebalancer_metrics_callback: RebalancerMetricsCallback = Arc::new(\n449\t move |in_progress: bool, docs_migrated: Option, duration_secs: Option| {\n450\t if in_progress {\n451\t metrics_for_worker.set_rebalance_in_progress(true);\n452\t } else {\n453\t metrics_for_worker.set_rebalance_in_progress(false);\n454\t }\n455\t if let Some(count) = docs_migrated {\n456\t metrics_for_worker.inc_rebalance_documents_migrated(count);\n457\t }\n458\t if let Some(duration) = duration_secs {\n459\t metrics_for_worker.observe_rebalance_duration(duration);\n460\t }\n461\t }\n462\t );\n463\t\n464\t Some(Arc::new(RebalancerWorker::with_metrics(\n465\t worker_config,\n466\t topology_arc.clone(),\n467\t store.clone(),\n468\t rebalancer.clone(),\n469\t migration_coordinator.clone(),\n470\t rebalancer_metrics.clone(),\n471\t pod_id.clone(),\n472\t Some(rebalancer_metrics_callback),\n473\t )))\n474\t } else {\n475\t None\n476\t };\n477\t\n478\t // Create settings broadcast coordinator (§13.5)\n479\t let settings_broadcast = if let Some(ref store) = task_store {\n480\t Arc::new(miroir_core::settings::SettingsBroadcast::with_task_store(store.clone()))\n481\t } else {\n482\t Arc::new(miroir_core::settings::SettingsBroadcast::new())\n483\t };\n484\t\n485\t // Create drift reconciler worker (§13.5) if task store is available\n486\t let drift_reconciler = if let Some(ref store) = task_store {\n487\t let node_addresses = config.nodes.iter().map(|n| n.address.clone()).collect();\n488\t let drift_config = miroir_core::rebalancer_worker::DriftReconcilerConfig {\n489\t interval_s: config.settings_drift_check.interval_s,\n490\t auto_repair: config.settings_drift_check.auto_repair,\n491\t lease_ttl_secs: 10,\n492\t lease_renewal_interval_ms: 2000,\n493\t };\n494\t Some(Arc::new(miroir_core::rebalancer_worker::DriftReconciler::new(\n495\t drift_config,\n496\t settings_broadcast.clone(),\n497\t store.clone(),\n498\t node_addresses,\n499\t config.node_master_key.clone(),\n500\t pod_id.clone(),\n501\t )))\n502\t } else {\n503\t None\n504\t };\n505\t\n506\t // Create session pinning manager (§13.6)\n507\t let session_manager = Arc::new(miroir_core::session_pinning::SessionManager::new(\n508\t miroir_core::session_pinning::SessionPinningConfig::from(\n509\t config.session_pinning.clone()\n510\t ),\n511\t ));\n512\t\n513\t // Create alias registry (§13.7)\n514\t // Note: Aliases are loaded asynchronously in background, not during initialization\n515\t let alias_registry = Arc::new(miroir_core::alias::AliasRegistry::new());\n516\t\n517\t Self {\n518\t config: Arc::new(config),\n519\t topology: topology_arc,\n520\t ready: Arc::new(RwLock::new(false)),\n521\t metrics,\n522\t version_state,\n523\t task_registry: Arc::new(task_registry),\n524\t redis_store,\n525\t task_store,\n526\t pod_id,\n527\t seal_key,\n528\t local_rate_limiter: LocalAdminRateLimiter::new(),\n529\t local_search_ui_rate_limiter: LocalSearchUiRateLimiter::new(),\n530\t rebalancer: Some(rebalancer),\n531\t migration_coordinator: Some(migration_coordinator),\n532\t rebalancer_worker,\n533\t rebalancer_metrics,\n534\t previous_docs_migrated: Arc::new(std::sync::atomic::AtomicU64::new(0)),\n535\t settings_broadcast,\n536\t drift_reconciler,\n537\t session_manager,\n538\t alias_registry,\n539\t }\n540\t }\n541\t\n542\t /// Mark the service as ready (all nodes reachable).\n543\t pub async fn mark_ready(&self) {\n544\t *self.ready.write().await = true;\n545\t info!(\"Service marked as ready\");\n546\t }\n547\t\n548\t /// Check if a covering quorum is reachable.\n549\t pub async fn check_covering_quorum(&self) -> bool {\n550\t let topo = self.topology.read().await;\n551\t let node_map = topo.node_map();\n552\t\n553\t // For each replica group, check if we have enough healthy nodes\n554\t for group in topo.groups() {\n555\t let healthy = group.healthy_nodes(&node_map);\n556\t let required = (topo.rf() + 1) / 2; // Simple majority for quorum\n557\t if healthy.len() < required {\n558\t return false;\n559\t }\n560\t }\n561\t\n562\t true\n563\t }\n564\t\n565\t /// Sync rebalancer metrics to Prometheus (called from health checker).\n566\t pub async fn sync_rebalancer_metrics_to_prometheus(&self) {\n567\t if let Some(ref rebalancer) = self.rebalancer {\n568\t let rebalancer_metrics = rebalancer.metrics.read().await;\n569\t let in_progress = rebalancer_metrics.rebalance_start_time.is_some();\n570\t self.metrics.set_rebalance_in_progress(in_progress);\n571\t\n572\t // Calculate delta for documents migrated counter\n573\t let current_total = rebalancer_metrics.documents_migrated_total;\n574\t let previous = self.previous_docs_migrated.load(std::sync::atomic::Ordering::Relaxed);\n575\t if current_total > previous {\n576\t let delta = current_total - previous;\n577\t self.metrics.inc_rebalance_documents_migrated(delta);\n578\t self.previous_docs_migrated.store(current_total, std::sync::atomic::Ordering::Relaxed);\n579\t }\n580\t\n581\t let duration = rebalancer_metrics.current_duration_secs();\n582\t if duration > 0.0 {\n583\t self.metrics.observe_rebalance_duration(duration);\n584\t }\n585\t }\n586\t }\n587\t}\n588\t\n589\t/// Response for GET /_miroir/topology (plan §10 JSON shape).\n590\t#[derive(Debug, Clone, Serialize, Deserialize)]\n591\tpub struct TopologyResponse {\n592\t pub shards: u32,\n593\t pub replication_factor: u32,\n594\t pub nodes: Vec,\n595\t pub degraded_node_count: u32,\n596\t pub rebalance_in_progress: bool,\n597\t pub fully_covered: bool,\n598\t}\n599\t\n600\t/// Per-node information in the topology response.\n601\t#[derive(Debug, Clone, Serialize, Deserialize)]\n602\tpub struct NodeInfo {\n603\t pub id: String,\n604\t pub address: String,\n605\t pub status: String,\n606\t pub shard_count: u32,\n607\t pub last_seen_ms: u64,\n608\t #[serde(skip_serializing_if = \"Option::is_none\")]\n609\t pub error: Option,\n610\t}\n611\t\n612\t/// Response for GET /_miroir/shards.\n613\t#[derive(Debug, Clone, Serialize, Deserialize)]\n614\tpub struct ShardsResponse {\n615\t pub shards: HashMap>, // shard_id -> list of node IDs\n616\t}\n617\t\n618\t/// GET /_miroir/topology — full cluster state per plan §10.\n619\tpub async fn get_topology(State(state): State) -> Result, StatusCode>\n620\twhere\n621\t S: Clone + Send + Sync + 'static,\n622\t AppState: FromRef,\n623\t{\n624\t let state = AppState::from_ref(&state);\n625\t let topo = state.topology.read().await;\n626\t\n627\t // Count degraded nodes\n628\t let degraded_count = topo.nodes().filter(|n| !n.is_healthy()).count() as u32;\n629\t\n630\t // Check rebalance status\n631\t let rebalance_in_progress = if let Some(ref rebalancer) = state.rebalancer {\n632\t let status = rebalancer.status().await;\n633\t status.in_progress\n634\t } else {\n635\t false\n636\t };\n637\t\n638\t // Build node info list\n639\t let nodes: Vec = topo\n640\t .nodes()\n641\t .map(|n| NodeInfo {\n642\t id: n.id.as_str().to_string(),\n643\t address: n.address.clone(),\n644\t status: format!(\"{:?}\", n.status).to_lowercase(),\n645\t shard_count: 0, // TODO: compute from routing table\n646\t last_seen_ms: 0, // TODO: track last health check time\n647\t error: None, // TODO: populate from last health check error\n648\t })\n649\t .collect();\n650\t\n651\t // Check if fully covered\n652\t let fully_covered = degraded_count == 0;\n653\t\n654\t let response = TopologyResponse {\n655\t shards: topo.shards,\n656\t replication_factor: topo.rf() as u32,\n657\t nodes,\n658\t degraded_node_count: degraded_count,\n659\t rebalance_in_progress,\n660\t fully_covered,\n661\t };\n662\t\n663\t Ok(Json(response))\n664\t}\n665\t\n666\t/// GET /_miroir/shards — shard → node mapping table.\n667\tpub async fn get_shards(State(state): State) -> Result, StatusCode>\n668\twhere\n669\t S: Clone + Send + Sync + 'static,\n670\t AppState: FromRef,\n671\t{\n672\t let state = AppState::from_ref(&state);\n673\t let topo = state.topology.read().await;\n674\t let mut shards = HashMap::new();\n675\t\n676\t // Build shard -> node mapping using rendezvous hash\n677\t for shard_id in 0..topo.shards {\n678\t let mut node_ids = Vec::new();\n679\t\n680\t // Collect nodes from all replica groups for this shard\n681\t for group in topo.groups() {\n682\t let assigned = router::assign_shard_in_group(shard_id, group.nodes(), topo.rf());\n683\t for node_id in assigned {\n684\t node_ids.push(node_id.as_str().to_string());\n685\t }\n686\t }\n687\t\n688\t shards.insert(shard_id.to_string(), node_ids);\n689\t }\n690\t\n691\t Ok(Json(ShardsResponse { shards }))\n692\t}\n693\t\n694\t/// GET /_miroir/ready — readiness probe (503 during startup, 200 once ready).\n695\tpub async fn get_ready(State(state): State) -> Result<&'static str, StatusCode>\n696\twhere\n697\t S: Clone + Send + Sync + 'static,\n698\t AppState: FromRef,\n699\t{\n700\t let state = AppState::from_ref(&state);\n701\t let ready = *state.ready.read().await;\n702\t\n703\t if ready {\n704\t Ok(\"\")\n705\t } else {\n706\t // Not yet marked ready - check if covering quorum exists\n707\t let has_quorum = state.check_covering_quorum().await;\n708\t if has_quorum {\n709\t // Auto-mark ready on first successful quorum check\n710\t state.mark_ready().await;\n711\t Ok(\"\")\n712\t } else {\n713\t Err(StatusCode::SERVICE_UNAVAILABLE)\n714\t }\n715\t }\n716\t}\n717\t\n718\t/// GET /_miroir/metrics — admin-key-gated Prometheus metrics.\n719\tpub async fn get_metrics(State(state): State) -> Response\n720\twhere\n721\t S: Clone + Send + Sync + 'static,\n722\t AppState: FromRef,\n723\t{\n724\t let state = AppState::from_ref(&state);\n725\t match state.metrics.encode_metrics() {\n726\t Ok(metrics) => metrics.into_response(),\n727\t Err(e) => {\n728\t tracing::error!(error = %e, \"failed to encode metrics\");\n729\t StatusCode::INTERNAL_SERVER_ERROR.into_response()\n730\t }\n731\t }\n732\t}\n733\t\n734\t/// POST /_miroir/ui/search/{index}/rotate-scoped-key — manual rotation trigger.\n735\t///\n736\t/// Admin-gated endpoint that initiates a scoped key rotation for the given index.\n737\t/// Set `force: true` in the request body to bypass the timing gate.\n738\tpub async fn rotate_scoped_key_handler(\n739\t State(state): State,\n740\t Path(index): Path,\n741\t Json(body): Json,\n742\t) -> Result, (StatusCode, String)>\n743\twhere\n744\t S: Clone + Send + Sync + 'static,\n745\t AppState: FromRef,\n746\t{\n747\t let app_state = AppState::from_ref(&state);\n748\t\n749\t let redis = app_state.redis_store.clone().ok_or_else(|| {\n750\t (\n751\t StatusCode::PRECONDITION_FAILED,\n752\t \"scoped key rotation requires Redis task store\".into(),\n753\t )\n754\t })?;\n755\t\n756\t if !app_state.config.search_ui.enabled {\n757\t return Err((\n758\t StatusCode::PRECONDITION_FAILED,\n759\t \"search_ui is not enabled\".into(),\n760\t ));\n761\t }\n762\t\n763\t let rotation_state = ScopedKeyRotationState {\n764\t config: app_state.config.clone(),\n765\t redis,\n766\t pod_id: app_state.pod_id.clone(),\n767\t };\n768\t\n769\t info!(\n770\t index = %index,\n771\t force = body.force,\n772\t pod_id = %app_state.pod_id,\n773\t \"manual scoped key rotation triggered\"\n774\t );\n775\t\n776\t match scoped_key_rotation::check_and_rotate(&rotation_state, &index, body.force).await {\n777\t Ok(response) => Ok(Json(response)),\n778\t Err(e) => {\n779\t error!(index = %index, error = %e, \"manual scoped key rotation failed\");\n780\t Err((StatusCode::INTERNAL_SERVER_ERROR, e))\n781\t }\n782\t }\n783\t}\n784\t\n785\t/// Parse a rate limit string like \"10/minute\" into (limit, window_seconds).\n786\tpub fn parse_rate_limit(s: &str) -> Result<(u64, u64), String> {\n787\t let parts: Vec<&str> = s.split('/').collect();\n788\t if parts.len() != 2 {\n789\t return Err(format!(\"invalid rate limit format: '{}', expected 'N/UNIT'\", s));\n790\t }\n791\t let limit: u64 = parts[0].parse()\n792\t .map_err(|_| format!(\"invalid limit number: '{}'\", parts[0]))?;\n793\t let window_seconds = match parts[1] {\n794\t \"second\" | \"s\" => 1,\n795\t \"minute\" | \"m\" => 60,\n796\t \"hour\" | \"h\" => 3600,\n797\t \"day\" | \"d\" => 86400,\n798\t unit => return Err(format!(\"invalid time unit: '{}', expected second/minute/hour/day\", unit)),\n799\t };\n800\t Ok((limit, window_seconds))\n801\t}\n802\t\n803\t/// Generate a random session ID.\n804\tfn generate_session_id() -> String {\n805\t let mut bytes = [0u8; 24];\n806\t rand::rngs::OsRng.fill_bytes(&mut bytes);\n807\t hex::encode(&bytes)\n808\t}\n809\t\n810\t/// POST /_miroir/admin/login — admin login with rate limiting and exponential backoff.\n811\t///\n812\t/// Request body:\n813\t/// ```json\n814\t/// { \"admin_key\": \"...\" }\n815\t/// ```\n816\t///\n817\t/// On success, sets a `miroir_admin_session` cookie and returns:\n818\t/// ```json\n819\t/// { \"success\": true }\n820\t/// ```\n821\t///\n822\t/// Rate limiting (per source IP):\n823\t/// - 10 requests per minute (configurable via `admin_ui.rate_limit.per_ip`)\n824\t/// - After 5 consecutive failed attempts, exponential backoff applies:\n825\t/// - 10m, 20m, 40m, ... up to 24h cap\n826\t///\n827\t/// Successful login resets both the rate limit counter and backoff state.\n828\tpub async fn admin_login(\n829\t State(state): State,\n830\t headers: HeaderMap,\n831\t Json(body): Json,\n832\t) -> Response\n833\twhere\n834\t S: Clone + Send + Sync + 'static,\n835\t AppState: FromRef,\n836\t{\n837\t let state = AppState::from_ref(&state);\n838\t\n839\t // Extract source IP from X-Forwarded-For or X-Real-IP (trust proxy)\n840\t let source_ip = headers\n841\t .get(\"x-forwarded-for\")\n842\t .and_then(|v| v.to_str().ok())\n843\t .and_then(|s| s.split(',').next())\n844\t .or_else(|| headers.get(\"x-real-ip\").and_then(|v| v.to_str().ok()))\n845\t .unwrap_or(\"unknown\")\n846\t .trim()\n847\t .to_string();\n848\t\n849\t // Parse rate limit config\n850\t let (limit, window_seconds) = match parse_rate_limit(&state.config.admin_ui.rate_limit.per_ip) {\n851\t Ok(parsed) => parsed,\n852\t Err(e) => {\n853\t error!(error = %e, \"invalid admin_ui.rate_limit.per_ip config\");\n854\t return (\n855\t StatusCode::INTERNAL_SERVER_ERROR,\n856\t Json(AdminLoginResponse {\n857\t success: false,\n858\t message: Some(\"Rate limit configuration error\".into()),\n859\t }),\n860\t ).into_response();\n861\t }\n862\t };\n863\t\n864\t // Check rate limit and backoff\n865\t let backend = state.config.admin_ui.rate_limit.backend.as_str();\n866\t if backend == \"redis\" {\n867\t if let Some(ref redis) = state.redis_store {\n868\t match redis.check_rate_limit_admin_login(&source_ip, limit, window_seconds) {\n869\t Ok((allowed, wait_seconds)) => {\n870\t if !allowed {\n871\t if let Some(ws) = wait_seconds {\n872\t warn!(\n873\t source_ip_hash = hash_for_log(&source_ip),\n874\t wait_seconds = ws,\n875\t \"admin login rate limited (backoff)\"\n876\t );\n877\t return (\n878\t StatusCode::TOO_MANY_REQUESTS,\n879\t Json(AdminLoginResponse {\n880\t success: false,\n881\t message: Some(format!(\n882\t \"Too many failed login attempts. Try again in {} seconds.\",\n883\t ws\n884\t )),\n885\t }),\n886\t ).into_response();\n887\t } else {\n888\t return (\n889\t StatusCode::TOO_MANY_REQUESTS,\n890\t Json(AdminLoginResponse {\n891\t success: false,\n892\t message: Some(\"Too many login attempts. Please try again later.\".into()),\n893\t }),\n894\t ).into_response();\n895\t }\n896\t }\n897\t // Allowed, proceed\n898\t }\n899\t Err(e) => {\n900\t error!(error = %e, \"failed to check admin login rate limit\");\n901\t // Continue anyway on error (fail-open)\n902\t }\n903\t }\n904\t }\n905\t } else if backend == \"local\" {\n906\t // Local backend rate limiting\n907\t let (allowed, wait_seconds) = state.local_rate_limiter.check(\n908\t &source_ip,\n909\t limit,\n910\t window_seconds * 1000,\n911\t state.config.admin_ui.rate_limit.failed_attempt_threshold,\n912\t state.config.admin_ui.rate_limit.backoff_start_minutes,\n913\t state.config.admin_ui.rate_limit.backoff_max_hours * 60,\n914\t );\n915\t if !allowed {\n916\t warn!(\n917\t source_ip_hash = hash_for_log(&source_ip),\n918\t wait_seconds = ?wait_seconds,\n919\t \"admin login rate limited (local backend)\"\n920\t );\n921\t return (\n922\t StatusCode::TOO_MANY_REQUESTS,\n923\t Json(AdminLoginResponse {\n924\t success: false,\n925\t message: if let Some(ws) = wait_seconds {\n926\t Some(format!(\n927\t \"Too many failed login attempts. Try again in {} seconds.\",\n928\t ws\n929\t ))\n930\t } else {\n931\t Some(\"Too many login attempts. Please try again later.\".into())\n932\t },\n933\t }),\n934\t ).into_response();\n935\t }\n936\t }\n937\t\n938\t // Verify admin_key (constant-time comparison to prevent timing side-channels)\n939\t use subtle::ConstantTimeEq as _;\n940\t if body.admin_key.as_bytes().ct_eq(state.config.admin.api_key.as_bytes()).into() {\n941\t // Successful login - reset rate limit counters\n942\t if backend == \"redis\" {\n943\t if let Some(ref redis) = state.redis_store {\n944\t if let Err(e) = redis.reset_rate_limit_admin_login(&source_ip) {\n945\t warn!(error = %e, \"failed to reset admin login rate limit\");\n946\t }\n947\t }\n948\t } else if backend == \"local\" {\n949\t state.local_rate_limiter.reset(&source_ip);\n950\t }\n951\t\n952\t // Generate session ID and seal it\n953\t let session_id = generate_session_id();\n954\t let sealed = match seal_session(&session_id, &state.seal_key) {\n955\t Ok(sealed) => sealed,\n956\t Err(e) => {\n957\t error!(error = %e, \"failed to seal admin session\");\n958\t return (\n959\t StatusCode::INTERNAL_SERVER_ERROR,\n960\t Json(AdminLoginResponse {\n961\t success: false,\n962\t message: Some(\"Failed to create session\".into()),\n963\t }),\n964\t ).into_response();\n965\t }\n966\t };\n967\t\n968\t info!(\n969\t source_ip_hash = hash_for_log(&source_ip),\n970\t session_prefix = &session_id[..8],\n971\t \"admin login successful\"\n972\t );\n973\t\n974\t // Set cookie and return success\n975\t (\n976\t StatusCode::OK,\n977\t [\n978\t (\"Set-Cookie\", format!(\"{}={}; HttpOnly; Secure; SameSite=Strict; Path=/; Max-Age={}\",\n979\t COOKIE_NAME, sealed, state.config.admin_ui.session_ttl_s)),\n980\t ],\n981\t Json(AdminLoginResponse {\n982\t success: true,\n983\t message: None,\n984\t }),\n985\t ).into_response()\n986\t } else {\n987\t // Wrong admin_key - record failure for backoff tracking\n988\t warn!(\n989\t source_ip_hash = hash_for_log(&source_ip),\n990\t \"admin login failed: invalid admin_key\"\n991\t );\n992\t\n993\t if backend == \"redis\" {\n994\t if let Some(ref redis) = state.redis_store {\n995\t let backoff_start_minutes = state.config.admin_ui.rate_limit.backoff_start_minutes;\n996\t let backoff_max_hours = state.config.admin_ui.rate_limit.backoff_max_hours;\n997\t let failed_threshold = state.config.admin_ui.rate_limit.failed_attempt_threshold;\n998\t\n999\t if let Err(e) = redis.record_failure_admin_login(\n1000\t &source_ip,\n1001\t failed_threshold,\n1002\t backoff_start_minutes,\n1003\t backoff_max_hours,\n1004\t ) {\n1005\t warn!(error = %e, \"failed to record admin login failure\");\n1006\t }\n1007\t }\n1008\t } else if backend == \"local\" {\n1009\t let backoff_start_minutes = state.config.admin_ui.rate_limit.backoff_start_minutes;\n1010\t let backoff_max_hours = state.config.admin_ui.rate_limit.backoff_max_hours;\n1011\t let failed_threshold = state.config.admin_ui.rate_limit.failed_attempt_threshold;\n1012\t\n1013\t state.local_rate_limiter.record_failure(\n1014\t &source_ip,\n1015\t failed_threshold,\n1016\t backoff_start_minutes,\n1017\t backoff_max_hours * 60,\n1018\t );\n1019\t }\n1020\t\n1021\t (\n1022\t StatusCode::UNAUTHORIZED,\n1023\t Json(AdminLoginResponse {\n1024\t success: false,\n1025\t message: Some(\"Invalid admin key\".into()),\n1026\t }),\n1027\t ).into_response()\n1028\t }\n1029\t}\n1030\t\n1031\t// ---------------------------------------------------------------------------\n1032\t// Rebalancer Admin API Endpoints (plan §4)\n1033\t// ---------------------------------------------------------------------------\n1034\t\n1035\t/// POST /_miroir/nodes — Add a node to a replica group.\n1036\t///\n1037\t/// Request body:\n1038\t/// ```json\n1039\t/// {\n1040\t/// \"id\": \"node-new\",\n1041\t/// \"address\": \"http://node-new:7700\",\n1042\t/// \"replica_group\": 0\n1043\t/// }\n1044\t/// ```\n1045\t///\n1046\t/// Implements plan §2 \"Adding a node to an existing group\":\n1047\t/// 1. Add node to topology in `Joining` state\n1048\t/// 2. Send `NodeAdded` event to rebalancer worker\n1049\t/// 3. Worker computes affected shards and starts migration with leader lease\n1050\tpub async fn add_node(\n1051\t State(state): State,\n1052\t Json(body): Json,\n1053\t) -> Result, (StatusCode, String)>\n1054\twhere\n1055\t S: Clone + Send + Sync + 'static,\n1056\t AppState: FromRef,\n1057\t{\n1058\t let app_state = AppState::from_ref(&state);\n1059\t\n1060\t let id = body.get(\"id\")\n1061\t .and_then(|v| v.as_str())\n1062\t .ok_or_else(|| (StatusCode::BAD_REQUEST, \"Missing 'id' field\".into()))?\n1063\t .to_string();\n1064\t\n1065\t let address = body.get(\"address\")\n1066\t .and_then(|v| v.as_str())\n1067\t .ok_or_else(|| (StatusCode::BAD_REQUEST, \"Missing 'address' field\".into()))?\n1068\t .to_string();\n1069\t\n1070\t let replica_group = body.get(\"replica_group\")\n1071\t .and_then(|v| v.as_u64())\n1072\t .ok_or_else(|| (StatusCode::BAD_REQUEST, \"Missing 'replica_group' field\".into()))?\n1073\t as u32;\n1074\t\n1075\t // Add node to topology\n1076\t {\n1077\t let mut topo = app_state.topology.write().await;\n1078\t // Check if node already exists\n1079\t let node_id = NodeId::new(id.clone());\n1080\t if topo.node(&node_id).is_some() {\n1081\t return Err((StatusCode::BAD_REQUEST,\n1082\t format!(\"Node {} already exists\", id)));\n1083\t }\n1084\t // Check if replica group exists\n1085\t let group_count = topo.groups().count() as u32;\n1086\t if replica_group >= group_count {\n1087\t return Err((StatusCode::BAD_REQUEST,\n1088\t format!(\"Replica group {} does not exist\", replica_group)));\n1089\t }\n1090\t let node = Node::new(node_id, address, replica_group);\n1091\t topo.add_node(node);\n1092\t }\n1093\t\n1094\t // Send event to rebalancer worker (if available)\n1095\t if let Some(ref worker) = app_state.rebalancer_worker {\n1096\t let event = TopologyChangeEvent::NodeAdded {\n1097\t node_id: id.clone(),\n1098\t replica_group,\n1099\t index_uid: \"default\".to_string(),\n1100\t };\n1101\t if let Err(e) = worker.event_sender().try_send(event) {\n1102\t error!(error = %e, node_id = %id, \"failed to send NodeAdded event to rebalancer worker\");\n1103\t return Err((StatusCode::INTERNAL_SERVER_ERROR,\n1104\t format!(\"Failed to queue rebalancing: {}\", e)));\n1105\t }\n1106\t }\n1107\t\n1108\t info!(node_id = %id, replica_group, \"Node addition queued for rebalancing\");\n1109\t Ok(Json(serde_json::json!({\n1110\t \"node_id\": id,\n1111\t \"replica_group\": replica_group,\n1112\t \"message\": format!(\"Node {} added to replica group {}, rebalancing will start shortly\", id, replica_group),\n1113\t })))\n1114\t}\n1115\t\n1116\t/// DELETE /_miroir/nodes/{id} — Remove a node from the cluster.\n1117\t///\n1118\t/// Request body (optional):\n1119\t/// ```json\n1120\t/// {\n1121\t/// \"force\": false // Set to true to bypass draining check\n1122\t/// }\n1123\t/// ```\n1124\t///\n1125\t/// Requires the node to be in `draining` state unless `force=true`.\n1126\t/// Note: This only removes the node from topology. Draining must be completed first.\n1127\tpub async fn remove_node(\n1128\t State(state): State,\n1129\t Path(node_id): Path,\n1130\t Json(body): Json,\n1131\t) -> Result, (StatusCode, String)>\n1132\twhere\n1133\t S: Clone + Send + Sync + 'static,\n1134\t AppState: FromRef,\n1135\t{\n1136\t let app_state = AppState::from_ref(&state);\n1137\t\n1138\t let force = body.get(\"force\")\n1139\t .and_then(|v| v.as_bool())\n1140\t .unwrap_or(false);\n1141\t\n1142\t let node_id_obj = NodeId::new(node_id.clone());\n1143\t\n1144\t // Check node state\n1145\t let node_status = {\n1146\t let topo = app_state.topology.read().await;\n1147\t let node = topo.node(&node_id_obj)\n1148\t .ok_or_else(|| (StatusCode::NOT_FOUND, format!(\"Node {} not found\", node_id)))?;\n1149\t\n1150\t // Check if this is the last node in the group\n1151\t let group = topo.groups()\n1152\t .find(|g| g.id == node.replica_group)\n1153\t .ok_or_else(|| (StatusCode::INTERNAL_SERVER_ERROR, format!(\"Replica group {} not found\", node.replica_group)))?;\n1154\t\n1155\t if group.nodes().len() <= 1 {\n1156\t return Err((StatusCode::BAD_REQUEST, \"Cannot remove the last node in a replica group\".into()));\n1157\t }\n1158\t\n1159\t node.status\n1160\t };\n1161\t\n1162\t if !force && node_status != miroir_core::topology::NodeStatus::Draining {\n1163\t return Err((StatusCode::BAD_REQUEST, format!(\n1164\t \"Node {} is not in draining state (current: {:?}), use force=true to bypass\",\n1165\t node_id, node_status\n1166\t ).into()));\n1167\t }\n1168\t\n1169\t // Remove node from topology\n1170\t {\n1171\t let mut topo = app_state.topology.write().await;\n1172\t topo.remove_node(&node_id_obj);\n1173\t }\n1174\t\n1175\t info!(node_id = %node_id, force, \"Node removal completed\");\n1176\t Ok(Json(serde_json::json!({\n1177\t \"node_id\": node_id,\n1178\t \"message\": format!(\"Node {} removed from cluster\", node_id),\n1179\t })))\n1180\t}\n1181\t\n1182\t/// POST /_miroir/nodes/{id}/drain — Drain a node (prepare for removal).\n1183\t///\n1184\t/// Implements plan §2 node drain flow:\n1185\t/// 1. Mark node as `draining`\n1186\t/// 2. Send `NodeDraining` event to rebalancer worker\n1187\t/// 3. Worker computes shard destinations and starts migration with leader lease\n1188\tpub async fn drain_node(\n1189\t State(state): State,\n1190\t Path(node_id): Path,\n1191\t) -> Result, (StatusCode, String)>\n1192\twhere\n1193\t S: Clone + Send + Sync + 'static,\n1194\t AppState: FromRef,\n1195\t{\n1196\t let app_state = AppState::from_ref(&state);\n1197\t\n1198\t // Check if worker is available\n1199\t let worker = app_state.rebalancer_worker.as_ref()\n1200\t .ok_or_else(|| (StatusCode::SERVICE_UNAVAILABLE, \"Rebalancer worker not initialized\".into()))?;\n1201\t\n1202\t // Get node info and mark as draining\n1203\t let replica_group = {\n1204\t let mut topo = app_state.topology.write().await;\n1205\t let node_id_obj = NodeId::new(node_id.clone());\n1206\t let node = topo.node(&node_id_obj)\n1207\t .ok_or_else(|| (StatusCode::NOT_FOUND, format!(\"Node {} not found\", node_id)))?;\n1208\t\n1209\t // Check if this is the last node in the group\n1210\t let group = topo.groups()\n1211\t .find(|g| g.id == node.replica_group)\n1212\t .ok_or_else(|| (StatusCode::INTERNAL_SERVER_ERROR, format!(\"Replica group {} not found\", node.replica_group)))?;\n1213\t\n1214\t if group.nodes().len() <= 1 {\n1215\t return Err((StatusCode::BAD_REQUEST, \"Cannot remove the last node in a replica group\".into()));\n1216\t }\n1217\t\n1218\t let replica_group = node.replica_group;\n1219\t\n1220\t // Mark node as draining\n1221\t if let Some(n) = topo.node_mut(&node_id_obj) {\n1222\t n.status = miroir_core::topology::NodeStatus::Draining;\n1223\t }\n1224\t\n1225\t replica_group\n1226\t };\n1227\t\n1228\t // Send event to rebalancer worker\n1229\t let event = TopologyChangeEvent::NodeDraining {\n1230\t node_id: node_id.clone(),\n1231\t replica_group,\n1232\t index_uid: \"default\".to_string(),\n1233\t };\n1234\t\n1235\t if let Err(e) = worker.event_sender().try_send(event) {\n1236\t error!(error = %e, node_id = %node_id, \"failed to send NodeDraining event to rebalancer worker\");\n1237\t return Err((StatusCode::INTERNAL_SERVER_ERROR, format!(\"Failed to queue drain: {}\", e)));\n1238\t }\n1239\t\n1240\t info!(node_id = %node_id, replica_group, \"Node drain queued for rebalancing\");\n1241\t Ok(Json(serde_json::json!({\n1242\t \"node_id\": node_id,\n1243\t \"replica_group\": replica_group,\n1244\t \"message\": format!(\"Node {} is draining, migrations will start shortly\", node_id),\n1245\t })))\n1246\t}\n1247\t\n1248\t/// POST /_miroir/nodes/{id}/fail — Mark a node as failed.\n1249\t///\n1250\t/// Marks a node as failed and sends a `NodeFailed` event to the rebalancer worker.\n1251\tpub async fn fail_node(\n1252\t State(state): State,\n1253\t Path(node_id): Path,\n1254\t) -> Result, (StatusCode, String)>\n1255\twhere\n1256\t S: Clone + Send + Sync + 'static,\n1257\t AppState: FromRef,\n1258\t{\n1259\t let app_state = AppState::from_ref(&state);\n1260\t\n1261\t // Check if worker is available\n1262\t let worker = app_state.rebalancer_worker.as_ref()\n1263\t .ok_or_else(|| (StatusCode::SERVICE_UNAVAILABLE, \"Rebalancer worker not initialized\".into()))?;\n1264\t\n1265\t // Get node info and mark as failed\n1266\t let replica_group = {\n1267\t let mut topo = app_state.topology.write().await;\n1268\t let node_id_obj = NodeId::new(node_id.clone());\n1269\t let node = topo.node(&node_id_obj)\n1270\t .ok_or_else(|| (StatusCode::NOT_FOUND, format!(\"Node {} not found\", node_id)))?;\n1271\t\n1272\t let replica_group = node.replica_group;\n1273\t\n1274\t // Mark node as failed\n1275\t if let Some(n) = topo.node_mut(&node_id_obj) {\n1276\t n.status = miroir_core::topology::NodeStatus::Failed;\n1277\t }\n1278\t\n1279\t replica_group\n1280\t };\n1281\t\n1282\t // Send event to rebalancer worker\n1283\t let event = TopologyChangeEvent::NodeFailed {\n1284\t node_id: node_id.clone(),\n1285\t replica_group,\n1286\t index_uid: \"default\".to_string(),\n1287\t };\n1288\t\n1289\t if let Err(e) = worker.event_sender().try_send(event) {\n1290\t error!(error = %e, node_id = %node_id, \"failed to send NodeFailed event to rebalancer worker\");\n1291\t return Err((StatusCode::INTERNAL_SERVER_ERROR, format!(\"Failed to queue node failure: {}\", e)));\n1292\t }\n1293\t\n1294\t info!(node_id = %node_id, replica_group, \"Node failure queued for handling\");\n1295\t Ok(Json(serde_json::json!({\n1296\t \"node_id\": node_id,\n1297\t \"replica_group\": replica_group,\n1298\t \"message\": format!(\"Node {} marked as failed\", node_id),\n1299\t })))\n1300\t}\n1301\t\n1302\t/// POST /_miroir/nodes/{id}/recover — Mark a failed node as recovered.\n1303\t///\n1304\t/// Marks a failed node as recovered and sends a `NodeRecovered` event to the rebalancer worker.\n1305\tpub async fn recover_node(\n1306\t State(state): State,\n1307\t Path(node_id): Path,\n1308\t) -> Result, (StatusCode, String)>\n1309\twhere\n1310\t S: Clone + Send + Sync + 'static,\n1311\t AppState: FromRef,\n1312\t{\n1313\t let app_state = AppState::from_ref(&state);\n1314\t\n1315\t // Check if worker is available\n1316\t let worker = app_state.rebalancer_worker.as_ref()\n1317\t .ok_or_else(|| (StatusCode::SERVICE_UNAVAILABLE, \"Rebalancer worker not initialized\".into()))?;\n1318\t\n1319\t // Get node info and mark as recovered\n1320\t let replica_group = {\n1321\t let mut topo = app_state.topology.write().await;\n1322\t let node_id_obj = NodeId::new(node_id.clone());\n1323\t let node = topo.node(&node_id_obj)\n1324\t .ok_or_else(|| (StatusCode::NOT_FOUND, format!(\"Node {} not found\", node_id)))?;\n1325\t\n1326\t let replica_group = node.replica_group;\n1327\t\n1328\t // Mark node as active (recovered)\n1329\t if let Some(n) = topo.node_mut(&node_id_obj) {\n1330\t n.status = miroir_core::topology::NodeStatus::Active;\n1331\t }\n1332\t\n1333\t replica_group\n1334\t };\n1335\t\n1336\t // Send event to rebalancer worker\n1337\t let event = TopologyChangeEvent::NodeRecovered {\n1338\t node_id: node_id.clone(),\n1339\t replica_group,\n1340\t index_uid: \"default\".to_string(),\n1341\t };\n1342\t\n1343\t if let Err(e) = worker.event_sender().try_send(event) {\n1344\t error!(error = %e, node_id = %node_id, \"failed to send NodeRecovered event to rebalancer worker\");\n1345\t return Err((StatusCode::INTERNAL_SERVER_ERROR, format!(\"Failed to queue node recovery: {}\", e)));\n1346\t }\n1347\t\n1348\t info!(node_id = %node_id, replica_group, \"Node recovery queued for handling\");\n1349\t Ok(Json(serde_json::json!({\n1350\t \"node_id\": node_id,\n1351\t \"replica_group\": replica_group,\n1352\t \"message\": format!(\"Node {} marked as recovered\", node_id),\n1353\t })))\n1354\t}\n1355\t\n1356\t/// GET /_miroir/rebalance/status — Get current rebalance status.\n1357\tpub async fn get_rebalance_status(\n1358\t State(state): State,\n1359\t) -> Result, (StatusCode, String)>\n1360\twhere\n1361\t S: Clone + Send + Sync + 'static,\n1362\t AppState: FromRef,\n1363\t{\n1364\t let app_state = AppState::from_ref(&state);\n1365\t\n1366\t // Get rebalancer status if available\n1367\t let rebalancer_status = if let Some(ref rebalancer) = app_state.rebalancer {\n1368\t let status = rebalancer.status().await;\n1369\t let metrics = rebalancer.metrics.read().await;\n1370\t Some(serde_json::json!({\n1371\t \"in_progress\": status.in_progress,\n1372\t \"operations\": status.operations,\n1373\t \"migrations\": status.migrations,\n1374\t \"metrics\": {\n1375\t \"documents_migrated_total\": metrics.documents_migrated_total,\n1376\t \"active_migrations\": metrics.active_migrations,\n1377\t \"current_duration_secs\": metrics.current_duration_secs(),\n1378\t },\n1379\t }))\n1380\t } else {\n1381\t None\n1382\t };\n1383\t\n1384\t // Get worker status if available\n1385\t let worker_status = if let Some(ref worker) = app_state.rebalancer_worker {\n1386\t Some(worker.get_status().await)\n1387\t } else {\n1388\t None\n1389\t };\n1390\t\n1391\t Ok(Json(serde_json::json!({\n1392\t \"rebalancer\": rebalancer_status,\n1393\t \"worker\": worker_status,\n1394\t })))\n1395\t}\n1396\t\n1397\t/// POST /_miroir/replica_groups — Add a replica group.\n1398\t///\n1399\t/// Request body:\n1400\t/// ```json\n1401\t/// {\n1402\t/// \"group_id\": 2,\n1403\t/// \"nodes\": [\n1404\t/// {\"id\": \"node-6\", \"address\": \"http://node-6:7700\"},\n1405\t/// {\"id\": \"node-7\", \"address\": \"http://node-7:7700\"}\n1406\t/// ]\n1407\t/// }\n1408\t/// ```\n1409\tpub async fn add_replica_group(\n1410\t State(state): State,\n1411\t Json(body): Json,\n1412\t) -> Result, (StatusCode, String)>\n1413\twhere\n1414\t S: Clone + Send + Sync + 'static,\n1415\t AppState: FromRef,\n1416\t{\n1417\t let app_state = AppState::from_ref(&state);\n1418\t\n1419\t let rebalancer = app_state.rebalancer.as_ref()\n1420\t .ok_or_else(|| (StatusCode::SERVICE_UNAVAILABLE, \"Rebalancer not initialized\".into()))?;\n1421\t\n1422\t let group_id = body.get(\"group_id\")\n1423\t .and_then(|v| v.as_u64())\n1424\t .ok_or_else(|| (StatusCode::BAD_REQUEST, \"Missing 'group_id' field\".into()))?\n1425\t as u32;\n1426\t\n1427\t let nodes_array = body.get(\"nodes\")\n1428\t .and_then(|v| v.as_array())\n1429\t .ok_or_else(|| (StatusCode::BAD_REQUEST, \"Missing 'nodes' field\".into()))?;\n1430\t\n1431\t let mut nodes = Vec::new();\n1432\t for node_obj in nodes_array {\n1433\t let id = node_obj.get(\"id\")\n1434\t .and_then(|v| v.as_str())\n1435\t .ok_or_else(|| (StatusCode::BAD_REQUEST, \"Missing node 'id'\".into()))?\n1436\t .to_string();\n1437\t\n1438\t let address = node_obj.get(\"address\")\n1439\t .and_then(|v| v.as_str())\n1440\t .ok_or_else(|| (StatusCode::BAD_REQUEST, \"Missing node 'address'\".into()))?\n1441\t .to_string();\n1442\t\n1443\t use miroir_core::rebalancer::GroupNodeSpec;\n1444\t nodes.push(GroupNodeSpec { id, address });\n1445\t }\n1446\t\n1447\t use miroir_core::rebalancer::AddReplicaGroupRequest;\n1448\t let request = AddReplicaGroupRequest { group_id, nodes };\n1449\t\n1450\t match rebalancer.add_replica_group(request).await {\n1451\t Ok(result) => {\n1452\t info!(group_id, \"Replica group addition completed\");\n1453\t Ok(Json(serde_json::json!({\n1454\t \"operation_id\": result.id,\n1455\t \"message\": result.message,\n1456\t })))\n1457\t }\n1458\t Err(e) => {\n1459\t error!(error = %e, group_id, \"Replica group addition failed\");\n1460\t Err((StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))\n1461\t }\n1462\t }\n1463\t}\n1464\t\n1465\t/// DELETE /_miroir/replica_groups/{id} — Remove a replica group.\n1466\tpub async fn remove_replica_group(\n1467\t State(state): State,\n1468\t Path(group_id): Path,\n1469\t Json(body): Json,\n1470\t) -> Result, (StatusCode, String)>\n1471\twhere\n1472\t S: Clone + Send + Sync + 'static,\n1473\t AppState: FromRef,\n1474\t{\n1475\t let app_state = AppState::from_ref(&state);\n1476\t\n1477\t let rebalancer = app_state.rebalancer.as_ref()\n1478\t .ok_or_else(|| (StatusCode::SERVICE_UNAVAILABLE, \"Rebalancer not initialized\".into()))?;\n1479\t\n1480\t let force = body.get(\"force\")\n1481\t .and_then(|v| v.as_bool())\n1482\t .unwrap_or(false);\n1483\t\n1484\t use miroir_core::rebalancer::RemoveReplicaGroupRequest;\n1485\t let request = RemoveReplicaGroupRequest { group_id, force };\n1486\t\n1487\t match rebalancer.remove_replica_group(request).await {\n1488\t Ok(result) => {\n1489\t info!(group_id, \"Replica group removal completed\");\n1490\t Ok(Json(serde_json::json!({\n1491\t \"operation_id\": result.id,\n1492\t \"message\": result.message,\n1493\t })))\n1494\t }\n1495\t Err(e) => {\n1496\t error!(error = %e, group_id, \"Replica group removal failed\");\n1497\t Err((StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))\n1498\t }\n1499\t }\n1500\t}\n1501\t\n1502\t#[cfg(test)]\n1503\tmod tests {\n1504\t use super::*;\n1505\t\n1506\t #[test]\n1507\t fn test_topology_response_serialization() {\n1508\t let response = TopologyResponse {\n1509\t shards: 64,\n1510\t replication_factor: 2,\n1511\t nodes: vec![\n1512\t NodeInfo {\n1513\t id: \"meili-0\".to_string(),\n1514\t address: \"http://meili-0.search.svc:7700\".to_string(),\n1515\t status: \"healthy\".to_string(),\n1516\t shard_count: 32,\n1517\t last_seen_ms: 100,\n1518\t error: None,\n1519\t },\n1520\t NodeInfo {\n1521\t id: \"meili-1\".to_string(),\n1522\t address: \"http://meili-1.search.svc:7700\".to_string(),\n1523\t status: \"degraded\".to_string(),\n1524\t shard_count: 32,\n1525\t last_seen_ms: 5000,\n1526\t error: Some(\"connection refused\".to_string()),\n1527\t },\n1528\t ],\n1529\t degraded_node_count: 1,\n1530\t rebalance_in_progress: false,\n1531\t fully_covered: false,\n1532\t };\n1533\t\n1534\t let json = serde_json::to_string(&response).unwrap();\n1535\t assert!(json.contains(\"\\\"shards\\\":64\"));\n1536\t assert!(json.contains(\"\\\"replication_factor\\\":2\"));\n1537\t assert!(json.contains(\"\\\"degraded_node_count\\\":1\"));\n1538\t assert!(json.contains(\"\\\"fully_covered\\\":false\"));\n1539\t assert!(json.contains(\"\\\"status\\\":\\\"healthy\\\"\"));\n1540\t assert!(json.contains(\"\\\"error\\\":\\\"connection refused\\\"\"));\n1541\t }\n1542\t\n1543\t #[test]\n1544\t fn test_shards_response_serialization() {\n1545\t let mut shards = HashMap::new();\n1546\t shards.insert(\"0\".to_string(), vec![\"node-0\".to_string(), \"node-1\".to_string()]);\n1547\t shards.insert(\"1\".to_string(), vec![\"node-1\".to_string(), \"node-0\".to_string()]);\n1548\t\n1549\t let response = ShardsResponse { shards };\n1550\t let json = serde_json::to_string(&response).unwrap();\n1551\t assert!(json.contains(\"\\\"0\\\"\"));\n1552\t assert!(json.contains(\"\\\"node-0\\\"\"));\n1553\t }\n1554\t\n1555\t #[test]\n1556\t fn test_node_info_with_optional_error() {\n1557\t let info = NodeInfo {\n1558\t id: \"test\".to_string(),\n1559\t address: \"http://meili-0.search.svc:7700\".to_string(),\n1560\t status: \"healthy\".to_string(),\n1561\t shard_count: 10,\n1562\t last_seen_ms: 100,\n1563\t error: None,\n1564\t };\n1565\t\n1566\t let json = serde_json::to_string(&info).unwrap();\n1567\t // error field should not be present when None\n1568\t assert!(!json.contains(\"error\"));\n1569\t }\n1570\t\n1571\t #[test]\n1572\t fn test_node_info_with_error() {\n1573\t let info = NodeInfo {\n1574\t id: \"test\".to_string(),\n1575\t address: \"http://meili-0.search.svc:7700\".to_string(),\n1576\t status: \"failed\".to_string(),\n1577\t shard_count: 10,\n1578\t last_seen_ms: 100,\n1579\t error: Some(\"timeout\".to_string()),\n1580\t };\n1581\t\n1582\t let json = serde_json::to_string(&info).unwrap();\n1583\t assert!(json.contains(\"\\\"error\\\":\\\"timeout\\\"\"));\n1584\t }\n1585\t}\n1586\t"}]},"parent_tool_use_id":null,"session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"c78cae56-2ec4-4bf9-a508-3b98eb4f9c18","timestamp":"2026-05-23T06:38:45.811Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/crates/miroir-proxy/src/routes/admin_endpoints.rs","content":"//! Admin API endpoints for topology, readiness, shards, and metrics.\n\nuse axum::{\n extract::{FromRef, Path, State},\n http::{HeaderMap, StatusCode},\n Json,\n response::{IntoResponse, Response},\n};\nuse miroir_core::{\n config::MiroirConfig,\n migration::{MigrationConfig, MigrationCoordinator},\n rebalancer::{MigrationExecutor, Rebalancer, RebalancerConfig, RebalancerMetrics},\n rebalancer_worker::{RebalancerMetricsCallback, RebalancerWorker, RebalancerWorkerConfig, TopologyChangeEvent},\n router,\n scatter::{DeleteByFilterRequest, FetchDocumentsRequest, FetchDocumentsResponse, WriteRequest},\n task_registry::TaskRegistryImpl,\n task_store::{RedisTaskStore, TaskStore},\n topology::{Node, NodeId, Topology},\n};\nuse rand::RngCore;\nuse serde::{Deserialize, Serialize};\nuse std::collections::HashMap;\nuse std::sync::Arc;\nuse std::time::Duration;\nuse tokio::sync::RwLock;\nuse tracing::{info, error, warn};\nuse reqwest::Client;\n\nuse crate::{\n admin_session::{seal_session, COOKIE_NAME, SealKey},\n client::HttpClient,\n scoped_key_rotation::{self, ScopedKeyRotationState, RotateScopedKeyRequest, RotateScopedKeyResponse},\n};\n\n/// Hash a PII value (IP address) for safe log correlation.\nfn hash_for_log(value: &str) -> String {\n use std::hash::{Hash, Hasher};\n let mut hasher = std::collections::hash_map::DefaultHasher::new();\n value.hash(&mut hasher);\n format!(\"{:016x}\", hasher.finish())\n}\n\n/// Request body for POST /_miroir/admin/login.\n#[derive(Deserialize)]\npub struct AdminLoginRequest {\n pub admin_key: String,\n}\n\nimpl std::fmt::Debug for AdminLoginRequest {\n fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {\n f.debug_struct(\"AdminLoginRequest\")\n .field(\"admin_key\", &\"[redacted]\")\n .finish()\n }\n}\n\n/// Response body for POST /_miroir/admin/login.\n#[derive(Debug, Serialize)]\npub struct AdminLoginResponse {\n pub success: bool,\n pub message: Option,\n}\n\n/// Version state with cache for fetching Meilisearch version.\n#[derive(Clone)]\npub struct VersionState {\n pub node_master_key: String,\n pub node_addresses: Vec,\n pub version_cache: Arc>>,\n pub last_cache_update: Arc>>,\n pub cache_ttl_secs: u64,\n}\n\nimpl VersionState {\n pub fn new(node_master_key: String, node_addresses: Vec) -> Self {\n Self {\n node_master_key,\n node_addresses,\n version_cache: Arc::new(RwLock::new(None)),\n last_cache_update: Arc::new(RwLock::new(None)),\n cache_ttl_secs: 60,\n }\n }\n\n /// Fetch version from a healthy node, using cache if within TTL.\n pub async fn get_version(&self) -> Result {\n // Check cache first\n {\n let cache = self.version_cache.read().await;\n let last_update = self.last_cache_update.read().await;\n if let (Some(ref cached), Some(last)) = (cache.as_ref(), last_update.as_ref()) {\n if last.elapsed().as_secs() < self.cache_ttl_secs {\n return Ok((**cached).clone());\n }\n }\n }\n\n // Cache miss or expired - fetch from a node\n let client = Client::builder()\n .timeout(Duration::from_secs(2))\n .build()\n .map_err(|_| StatusCode::INTERNAL_SERVER_ERROR)?;\n\n for address in &self.node_addresses {\n let url = format!(\"{}/version\", address.trim_end_matches('/'));\n let response = client\n .get(&url)\n .header(\"Authorization\", format!(\"Bearer {}\", self.node_master_key))\n .send()\n .await;\n\n if let Ok(resp) = response {\n if resp.status().is_success() {\n if let Ok(body) = resp.text().await {\n // Update cache\n *self.version_cache.write().await = Some(body.clone());\n *self.last_cache_update.write().await = Some(std::time::Instant::now());\n return Ok(body);\n }\n }\n }\n }\n\n Err(StatusCode::SERVICE_UNAVAILABLE)\n }\n}\n\n// ---------------------------------------------------------------------------\n// Local Rate Limiter (for single-pod deployments)\n// ---------------------------------------------------------------------------\n\n/// In-memory rate limiter for admin login (local backend only).\n/// Thread-safe using Arc>.\n#[derive(Debug, Clone)]\npub struct LocalAdminRateLimiter {\n inner: Arc>,\n}\n\n#[derive(Debug, Default)]\nstruct LocalAdminRateLimiterInner {\n /// Map of IP -> (request_timestamps_ms, failed_count, backoff_until_ms)\n state: HashMap,\n}\n\n#[derive(Debug, Default, Clone)]\nstruct LocalRateLimitState {\n /// Timestamps of recent requests (for sliding window)\n request_timestamps_ms: Vec,\n /// Consecutive failed login attempts\n failed_count: u32,\n /// Unix timestamp (ms) when backoff expires\n backoff_until_ms: Option,\n}\n\nimpl LocalAdminRateLimiter {\n pub fn new() -> Self {\n Self {\n inner: Arc::new(std::sync::Mutex::new(LocalAdminRateLimiterInner::default())),\n }\n }\n\n /// Check rate limit and exponential backoff.\n /// Returns (allowed, wait_seconds).\n pub fn check(\n &self,\n ip: &str,\n limit: u64,\n window_ms: u64,\n failed_threshold: u32,\n backoff_start_minutes: u64,\n backoff_max_hours: u64,\n ) -> (bool, Option) {\n let mut inner = self.inner.lock().unwrap();\n let now = now_ms();\n let state = inner.state.entry(ip.to_string()).or_default();\n\n // Check if we're in backoff mode\n if let Some(backoff_until) = state.backoff_until_ms {\n if backoff_until > now {\n let wait_seconds = ((backoff_until - now) / 1000) as u64;\n return (false, Some(wait_seconds));\n }\n // Backoff expired, clear it\n state.backoff_until_ms = None;\n }\n\n // Clean old timestamps outside the window\n state.request_timestamps_ms.retain(|&ts| now - ts < window_ms as i64);\n\n // Check if limit exceeded\n if state.request_timestamps_ms.len() >= limit as usize {\n // Enter backoff mode after threshold consecutive failures\n let failed = state.failed_count + 1;\n state.failed_count = failed;\n\n if failed >= failed_threshold {\n let backoff_minutes = backoff_start_minutes * (1u64 << ((failed - failed_threshold) as u64).min(7)); // Cap at 2^7 = 128x\n let backoff_seconds = (backoff_minutes * 60).min(backoff_max_hours * 3600);\n state.backoff_until_ms = Some(now + (backoff_seconds as i64 * 1000));\n return (false, Some(backoff_seconds));\n }\n\n return (false, None);\n }\n\n // Record this request\n state.request_timestamps_ms.push(now);\n (true, None)\n }\n\n /// Reset rate limit and backoff state on successful login.\n pub fn reset(&self, ip: &str) {\n let mut inner = self.inner.lock().unwrap();\n inner.state.remove(ip);\n }\n\n /// Record a failed login attempt (for backoff calculation).\n pub fn record_failure(&self, ip: &str, failed_threshold: u32, backoff_start_minutes: u64, backoff_max_hours: u64) -> Option {\n let mut inner = self.inner.lock().unwrap();\n let now = now_ms();\n let state = inner.state.entry(ip.to_string()).or_default();\n\n state.failed_count += 1;\n\n if state.failed_count >= failed_threshold {\n let backoff_minutes = backoff_start_minutes * (1u64 << ((state.failed_count - failed_threshold) as u64).min(7));\n let backoff_seconds = (backoff_minutes * 60).min(backoff_max_hours * 3600);\n state.backoff_until_ms = Some(now + (backoff_seconds as i64 * 1000));\n return Some(backoff_seconds);\n }\n\n None\n }\n}\n\nimpl Default for LocalAdminRateLimiter {\n fn default() -> Self {\n Self::new()\n }\n}\n\n/// In-memory rate limiter for search UI (local backend only).\n/// Thread-safe using Arc>.\n#[derive(Debug, Clone)]\npub struct LocalSearchUiRateLimiter {\n inner: Arc>,\n}\n\n#[derive(Debug, Default)]\nstruct LocalSearchUiRateLimiterInner {\n /// Map of IP -> request_timestamps_ms\n state: HashMap>,\n}\n\nimpl LocalSearchUiRateLimiter {\n pub fn new() -> Self {\n Self {\n inner: Arc::new(std::sync::Mutex::new(LocalSearchUiRateLimiterInner::default())),\n }\n }\n\n /// Check rate limit for search UI.\n /// Returns (allowed, wait_seconds).\n pub fn check(\n &self,\n ip: &str,\n limit: u64,\n window_ms: u64,\n ) -> (bool, Option) {\n let mut inner = self.inner.lock().unwrap();\n let now = now_ms();\n let timestamps = inner.state.entry(ip.to_string()).or_default();\n\n // Clean old timestamps outside the window\n timestamps.retain(|&ts| now - ts < window_ms as i64);\n\n // Check if limit exceeded\n if timestamps.len() >= limit as usize {\n return (false, None);\n }\n\n // Record this request\n timestamps.push(now);\n (true, None)\n }\n}\n\nimpl Default for LocalSearchUiRateLimiter {\n fn default() -> Self {\n Self::new()\n }\n}\n\n/// Get current time in milliseconds since Unix epoch.\nfn now_ms() -> i64 {\n std::time::SystemTime::now()\n .duration_since(std::time::UNIX_EPOCH)\n .unwrap_or_default()\n .as_millis() as i64\n}\n\n/// Shared application state for admin endpoints.\n#[derive(Clone)]\npub struct AppState {\n pub config: Arc,\n pub topology: Arc>,\n pub ready: Arc>,\n pub metrics: super::super::middleware::Metrics,\n pub version_state: VersionState,\n pub task_registry: Arc,\n pub redis_store: Option,\n pub task_store: Option>,\n pub pod_id: String,\n pub seal_key: SealKey,\n pub local_rate_limiter: LocalAdminRateLimiter,\n pub local_search_ui_rate_limiter: LocalSearchUiRateLimiter,\n pub rebalancer: Option>,\n pub migration_coordinator: Option>>,\n pub rebalancer_worker: Option>,\n pub rebalancer_metrics: Arc>,\n /// Track previous documents migrated value for delta calculation.\n pub previous_docs_migrated: Arc,\n /// Two-phase settings broadcast coordinator (§13.5).\n pub settings_broadcast: Arc,\n /// Settings drift reconciler worker (§13.5).\n pub drift_reconciler: Option>,\n /// Session pinning manager (§13.6).\n pub session_manager: Arc,\n /// Alias registry (§13.7).\n pub alias_registry: Arc,\n}\n\nimpl AppState {\n pub fn new(\n config: MiroirConfig,\n metrics: super::super::middleware::Metrics,\n seal_key: SealKey,\n ) -> Self {\n Self::with_redis(config, metrics, None, \"unknown\".into(), seal_key)\n }\n\n pub fn with_redis(\n config: MiroirConfig,\n metrics: super::super::middleware::Metrics,\n redis_store: Option,\n pod_id: String,\n seal_key: SealKey,\n ) -> Self {\n // Build initial topology from config\n let mut topology = Topology::new(\n config.shards,\n config.replica_groups,\n config.replication_factor as usize,\n );\n\n for node_config in &config.nodes {\n let node = Node::new(\n NodeId::new(node_config.id.clone()),\n node_config.address.clone(),\n node_config.replica_group,\n );\n // Start nodes in Joining state - health checker will promote to Active\n topology.add_node(node);\n }\n\n let version_state = VersionState::new(\n config.node_master_key.clone(),\n config.nodes.iter().map(|n| n.address.clone()).collect(),\n );\n\n // Select task registry backend based on config\n let task_registry = match config.task_store.backend.as_str() {\n \"redis\" if redis_store.is_some() => {\n let store = redis_store.as_ref().unwrap().clone();\n store.migrate().expect(\"Redis migration failed\");\n TaskRegistryImpl::Redis(Arc::new(store))\n }\n \"sqlite\" if !config.task_store.path.is_empty() => {\n TaskRegistryImpl::sqlite(&config.task_store.path)\n .expect(\"Failed to open SQLite task store\")\n }\n _ => TaskRegistryImpl::in_memory(),\n };\n\n let topology_arc = Arc::new(RwLock::new(topology));\n\n // Initialize rebalancer and migration coordinator\n let rebalancer_config = RebalancerConfig {\n max_concurrent_migrations: config.rebalancer.max_concurrent_migrations,\n migration_timeout_s: config.rebalancer.migration_timeout_s,\n auto_rebalance_on_recovery: config.rebalancer.auto_rebalance_on_recovery,\n migration_batch_size: 1000,\n migration_batch_delay_ms: 100,\n };\n\n let migration_config = MigrationConfig {\n drain_timeout: std::time::Duration::from_secs(30),\n skip_delta_pass: false,\n anti_entropy_enabled: config.anti_entropy.enabled,\n };\n\n let migration_coordinator = Arc::new(RwLock::new(\n MigrationCoordinator::new(migration_config.clone())\n ));\n\n // Create migration executor for actual HTTP document migration\n use miroir_core::rebalancer::HttpMigrationExecutor;\n let migration_executor = Arc::new(HttpMigrationExecutor::new(\n config.node_master_key.clone(),\n config.scatter.node_timeout_ms,\n ));\n\n let rebalancer = Arc::new(Rebalancer::new(\n rebalancer_config.clone(),\n topology_arc.clone(),\n migration_config.clone(),\n ).with_migration_executor(migration_executor));\n\n // Create rebalancer metrics\n let rebalancer_metrics = Arc::new(RwLock::new(RebalancerMetrics::default()));\n\n // Get or create task store for rebalancer worker\n let task_store: Option> = match config.task_store.backend.as_str() {\n \"redis\" => {\n redis_store.as_ref().map(|s| Arc::new(s.clone()) as Arc)\n }\n \"sqlite\" if !config.task_store.path.is_empty() => {\n Some(Arc::new(miroir_core::task_store::SqliteTaskStore::open(\n std::path::Path::new(&config.task_store.path)\n ).expect(\"Failed to open SQLite task store\")) as Arc)\n }\n _ => None,\n };\n\n // Create rebalancer worker if task store is available\n let rebalancer_worker = if let Some(ref store) = task_store {\n let worker_config = RebalancerWorkerConfig {\n max_concurrent_migrations: config.rebalancer.max_concurrent_migrations,\n lease_ttl_secs: 10,\n lease_renewal_interval_ms: 2000,\n migration_batch_size: 1000,\n migration_batch_delay_ms: 100,\n event_channel_capacity: 100,\n };\n\n // Create metrics callback for rebalancer operations\n let metrics_for_worker = metrics.clone();\n let rebalancer_metrics_callback: RebalancerMetricsCallback = Arc::new(\n move |in_progress: bool, docs_migrated: Option, duration_secs: Option| {\n if in_progress {\n metrics_for_worker.set_rebalance_in_progress(true);\n } else {\n metrics_for_worker.set_rebalance_in_progress(false);\n }\n if let Some(count) = docs_migrated {\n metrics_for_worker.inc_rebalance_documents_migrated(count);\n }\n if let Some(duration) = duration_secs {\n metrics_for_worker.observe_rebalance_duration(duration);\n }\n }\n );\n\n Some(Arc::new(RebalancerWorker::with_metrics(\n worker_config,\n topology_arc.clone(),\n store.clone(),\n rebalancer.clone(),\n migration_coordinator.clone(),\n rebalancer_metrics.clone(),\n pod_id.clone(),\n Some(rebalancer_metrics_callback),\n )))\n } else {\n None\n };\n\n // Create settings broadcast coordinator (§13.5)\n let settings_broadcast = if let Some(ref store) = task_store {\n Arc::new(miroir_core::settings::SettingsBroadcast::with_task_store(store.clone()))\n } else {\n Arc::new(miroir_core::settings::SettingsBroadcast::new())\n };\n\n // Create drift reconciler worker (§13.5) if task store is available\n let drift_reconciler = if let Some(ref store) = task_store {\n let node_addresses = config.nodes.iter().map(|n| n.address.clone()).collect();\n let drift_config = miroir_core::rebalancer_worker::DriftReconcilerConfig {\n interval_s: config.settings_drift_check.interval_s,\n auto_repair: config.settings_drift_check.auto_repair,\n lease_ttl_secs: 10,\n lease_renewal_interval_ms: 2000,\n };\n Some(Arc::new(miroir_core::rebalancer_worker::DriftReconciler::new(\n drift_config,\n settings_broadcast.clone(),\n store.clone(),\n node_addresses,\n config.node_master_key.clone(),\n pod_id.clone(),\n )))\n } else {\n None\n };\n\n // Create session pinning manager (§13.6)\n let session_manager = Arc::new(miroir_core::session_pinning::SessionManager::new(\n miroir_core::session_pinning::SessionPinningConfig::from(\n config.session_pinning.clone()\n ),\n ));\n\n // Create alias registry (§13.7)\n // Note: Aliases are loaded asynchronously in background, not during initialization\n let alias_registry = Arc::new(miroir_core::alias::AliasRegistry::new());\n\n Self {\n config: Arc::new(config),\n topology: topology_arc,\n ready: Arc::new(RwLock::new(false)),\n metrics,\n version_state,\n task_registry: Arc::new(task_registry),\n redis_store,\n task_store,\n pod_id,\n seal_key,\n local_rate_limiter: LocalAdminRateLimiter::new(),\n local_search_ui_rate_limiter: LocalSearchUiRateLimiter::new(),\n rebalancer: Some(rebalancer),\n migration_coordinator: Some(migration_coordinator),\n rebalancer_worker,\n rebalancer_metrics,\n previous_docs_migrated: Arc::new(std::sync::atomic::AtomicU64::new(0)),\n settings_broadcast,\n drift_reconciler,\n session_manager,\n alias_registry,\n }\n }\n\n /// Mark the service as ready (all nodes reachable).\n pub async fn mark_ready(&self) {\n *self.ready.write().await = true;\n info!(\"Service marked as ready\");\n }\n\n /// Check if a covering quorum is reachable.\n pub async fn check_covering_quorum(&self) -> bool {\n let topo = self.topology.read().await;\n let node_map = topo.node_map();\n\n // For each replica group, check if we have enough healthy nodes\n for group in topo.groups() {\n let healthy = group.healthy_nodes(&node_map);\n let required = (topo.rf() + 1) / 2; // Simple majority for quorum\n if healthy.len() < required {\n return false;\n }\n }\n\n true\n }\n\n /// Sync rebalancer metrics to Prometheus (called from health checker).\n pub async fn sync_rebalancer_metrics_to_prometheus(&self) {\n if let Some(ref rebalancer) = self.rebalancer {\n let rebalancer_metrics = rebalancer.metrics.read().await;\n let in_progress = rebalancer_metrics.rebalance_start_time.is_some();\n self.metrics.set_rebalance_in_progress(in_progress);\n\n // Calculate delta for documents migrated counter\n let current_total = rebalancer_metrics.documents_migrated_total;\n let previous = self.previous_docs_migrated.load(std::sync::atomic::Ordering::Relaxed);\n if current_total > previous {\n let delta = current_total - previous;\n self.metrics.inc_rebalance_documents_migrated(delta);\n self.previous_docs_migrated.store(current_total, std::sync::atomic::Ordering::Relaxed);\n }\n\n let duration = rebalancer_metrics.current_duration_secs();\n if duration > 0.0 {\n self.metrics.observe_rebalance_duration(duration);\n }\n }\n }\n}\n\n/// Response for GET /_miroir/topology (plan §10 JSON shape).\n#[derive(Debug, Clone, Serialize, Deserialize)]\npub struct TopologyResponse {\n pub shards: u32,\n pub replication_factor: u32,\n pub nodes: Vec,\n pub degraded_node_count: u32,\n pub rebalance_in_progress: bool,\n pub fully_covered: bool,\n}\n\n/// Per-node information in the topology response.\n#[derive(Debug, Clone, Serialize, Deserialize)]\npub struct NodeInfo {\n pub id: String,\n pub address: String,\n pub status: String,\n pub shard_count: u32,\n pub last_seen_ms: u64,\n #[serde(skip_serializing_if = \"Option::is_none\")]\n pub error: Option,\n}\n\n/// Response for GET /_miroir/shards.\n#[derive(Debug, Clone, Serialize, Deserialize)]\npub struct ShardsResponse {\n pub shards: HashMap>, // shard_id -> list of node IDs\n}\n\n/// GET /_miroir/topology — full cluster state per plan §10.\npub async fn get_topology(State(state): State) -> Result, StatusCode>\nwhere\n S: Clone + Send + Sync + 'static,\n AppState: FromRef,\n{\n let state = AppState::from_ref(&state);\n let topo = state.topology.read().await;\n\n // Count degraded nodes\n let degraded_count = topo.nodes().filter(|n| !n.is_healthy()).count() as u32;\n\n // Check rebalance status\n let rebalance_in_progress = if let Some(ref rebalancer) = state.rebalancer {\n let status = rebalancer.status().await;\n status.in_progress\n } else {\n false\n };\n\n // Build node info list\n let nodes: Vec = topo\n .nodes()\n .map(|n| NodeInfo {\n id: n.id.as_str().to_string(),\n address: n.address.clone(),\n status: format!(\"{:?}\", n.status).to_lowercase(),\n shard_count: 0, // TODO: compute from routing table\n last_seen_ms: 0, // TODO: track last health check time\n error: None, // TODO: populate from last health check error\n })\n .collect();\n\n // Check if fully covered\n let fully_covered = degraded_count == 0;\n\n let response = TopologyResponse {\n shards: topo.shards,\n replication_factor: topo.rf() as u32,\n nodes,\n degraded_node_count: degraded_count,\n rebalance_in_progress,\n fully_covered,\n };\n\n Ok(Json(response))\n}\n\n/// GET /_miroir/shards — shard → node mapping table.\npub async fn get_shards(State(state): State) -> Result, StatusCode>\nwhere\n S: Clone + Send + Sync + 'static,\n AppState: FromRef,\n{\n let state = AppState::from_ref(&state);\n let topo = state.topology.read().await;\n let mut shards = HashMap::new();\n\n // Build shard -> node mapping using rendezvous hash\n for shard_id in 0..topo.shards {\n let mut node_ids = Vec::new();\n\n // Collect nodes from all replica groups for this shard\n for group in topo.groups() {\n let assigned = router::assign_shard_in_group(shard_id, group.nodes(), topo.rf());\n for node_id in assigned {\n node_ids.push(node_id.as_str().to_string());\n }\n }\n\n shards.insert(shard_id.to_string(), node_ids);\n }\n\n Ok(Json(ShardsResponse { shards }))\n}\n\n/// GET /_miroir/ready — readiness probe (503 during startup, 200 once ready).\npub async fn get_ready(State(state): State) -> Result<&'static str, StatusCode>\nwhere\n S: Clone + Send + Sync + 'static,\n AppState: FromRef,\n{\n let state = AppState::from_ref(&state);\n let ready = *state.ready.read().await;\n\n if ready {\n Ok(\"\")\n } else {\n // Not yet marked ready - check if covering quorum exists\n let has_quorum = state.check_covering_quorum().await;\n if has_quorum {\n // Auto-mark ready on first successful quorum check\n state.mark_ready().await;\n Ok(\"\")\n } else {\n Err(StatusCode::SERVICE_UNAVAILABLE)\n }\n }\n}\n\n/// GET /_miroir/metrics — admin-key-gated Prometheus metrics.\npub async fn get_metrics(State(state): State) -> Response\nwhere\n S: Clone + Send + Sync + 'static,\n AppState: FromRef,\n{\n let state = AppState::from_ref(&state);\n match state.metrics.encode_metrics() {\n Ok(metrics) => metrics.into_response(),\n Err(e) => {\n tracing::error!(error = %e, \"failed to encode metrics\");\n StatusCode::INTERNAL_SERVER_ERROR.into_response()\n }\n }\n}\n\n/// POST /_miroir/ui/search/{index}/rotate-scoped-key — manual rotation trigger.\n///\n/// Admin-gated endpoint that initiates a scoped key rotation for the given index.\n/// Set `force: true` in the request body to bypass the timing gate.\npub async fn rotate_scoped_key_handler(\n State(state): State,\n Path(index): Path,\n Json(body): Json,\n) -> Result, (StatusCode, String)>\nwhere\n S: Clone + Send + Sync + 'static,\n AppState: FromRef,\n{\n let app_state = AppState::from_ref(&state);\n\n let redis = app_state.redis_store.clone().ok_or_else(|| {\n (\n StatusCode::PRECONDITION_FAILED,\n \"scoped key rotation requires Redis task store\".into(),\n )\n })?;\n\n if !app_state.config.search_ui.enabled {\n return Err((\n StatusCode::PRECONDITION_FAILED,\n \"search_ui is not enabled\".into(),\n ));\n }\n\n let rotation_state = ScopedKeyRotationState {\n config: app_state.config.clone(),\n redis,\n pod_id: app_state.pod_id.clone(),\n };\n\n info!(\n index = %index,\n force = body.force,\n pod_id = %app_state.pod_id,\n \"manual scoped key rotation triggered\"\n );\n\n match scoped_key_rotation::check_and_rotate(&rotation_state, &index, body.force).await {\n Ok(response) => Ok(Json(response)),\n Err(e) => {\n error!(index = %index, error = %e, \"manual scoped key rotation failed\");\n Err((StatusCode::INTERNAL_SERVER_ERROR, e))\n }\n }\n}\n\n/// Parse a rate limit string like \"10/minute\" into (limit, window_seconds).\npub fn parse_rate_limit(s: &str) -> Result<(u64, u64), String> {\n let parts: Vec<&str> = s.split('/').collect();\n if parts.len() != 2 {\n return Err(format!(\"invalid rate limit format: '{}', expected 'N/UNIT'\", s));\n }\n let limit: u64 = parts[0].parse()\n .map_err(|_| format!(\"invalid limit number: '{}'\", parts[0]))?;\n let window_seconds = match parts[1] {\n \"second\" | \"s\" => 1,\n \"minute\" | \"m\" => 60,\n \"hour\" | \"h\" => 3600,\n \"day\" | \"d\" => 86400,\n unit => return Err(format!(\"invalid time unit: '{}', expected second/minute/hour/day\", unit)),\n };\n Ok((limit, window_seconds))\n}\n\n/// Generate a random session ID.\nfn generate_session_id() -> String {\n let mut bytes = [0u8; 24];\n rand::rngs::OsRng.fill_bytes(&mut bytes);\n hex::encode(&bytes)\n}\n\n/// POST /_miroir/admin/login — admin login with rate limiting and exponential backoff.\n///\n/// Request body:\n/// ```json\n/// { \"admin_key\": \"...\" }\n/// ```\n///\n/// On success, sets a `miroir_admin_session` cookie and returns:\n/// ```json\n/// { \"success\": true }\n/// ```\n///\n/// Rate limiting (per source IP):\n/// - 10 requests per minute (configurable via `admin_ui.rate_limit.per_ip`)\n/// - After 5 consecutive failed attempts, exponential backoff applies:\n/// - 10m, 20m, 40m, ... up to 24h cap\n///\n/// Successful login resets both the rate limit counter and backoff state.\npub async fn admin_login(\n State(state): State,\n headers: HeaderMap,\n Json(body): Json,\n) -> Response\nwhere\n S: Clone + Send + Sync + 'static,\n AppState: FromRef,\n{\n let state = AppState::from_ref(&state);\n\n // Extract source IP from X-Forwarded-For or X-Real-IP (trust proxy)\n let source_ip = headers\n .get(\"x-forwarded-for\")\n .and_then(|v| v.to_str().ok())\n .and_then(|s| s.split(',').next())\n .or_else(|| headers.get(\"x-real-ip\").and_then(|v| v.to_str().ok()))\n .unwrap_or(\"unknown\")\n .trim()\n .to_string();\n\n // Parse rate limit config\n let (limit, window_seconds) = match parse_rate_limit(&state.config.admin_ui.rate_limit.per_ip) {\n Ok(parsed) => parsed,\n Err(e) => {\n error!(error = %e, \"invalid admin_ui.rate_limit.per_ip config\");\n return (\n StatusCode::INTERNAL_SERVER_ERROR,\n Json(AdminLoginResponse {\n success: false,\n message: Some(\"Rate limit configuration error\".into()),\n }),\n ).into_response();\n }\n };\n\n // Check rate limit and backoff\n let backend = state.config.admin_ui.rate_limit.backend.as_str();\n if backend == \"redis\" {\n if let Some(ref redis) = state.redis_store {\n match redis.check_rate_limit_admin_login(&source_ip, limit, window_seconds) {\n Ok((allowed, wait_seconds)) => {\n if !allowed {\n if let Some(ws) = wait_seconds {\n warn!(\n source_ip_hash = hash_for_log(&source_ip),\n wait_seconds = ws,\n \"admin login rate limited (backoff)\"\n );\n return (\n StatusCode::TOO_MANY_REQUESTS,\n Json(AdminLoginResponse {\n success: false,\n message: Some(format!(\n \"Too many failed login attempts. Try again in {} seconds.\",\n ws\n )),\n }),\n ).into_response();\n } else {\n return (\n StatusCode::TOO_MANY_REQUESTS,\n Json(AdminLoginResponse {\n success: false,\n message: Some(\"Too many login attempts. Please try again later.\".into()),\n }),\n ).into_response();\n }\n }\n // Allowed, proceed\n }\n Err(e) => {\n error!(error = %e, \"failed to check admin login rate limit\");\n // Continue anyway on error (fail-open)\n }\n }\n }\n } else if backend == \"local\" {\n // Local backend rate limiting\n let (allowed, wait_seconds) = state.local_rate_limiter.check(\n &source_ip,\n limit,\n window_seconds * 1000,\n state.config.admin_ui.rate_limit.failed_attempt_threshold,\n state.config.admin_ui.rate_limit.backoff_start_minutes,\n state.config.admin_ui.rate_limit.backoff_max_hours * 60,\n );\n if !allowed {\n warn!(\n source_ip_hash = hash_for_log(&source_ip),\n wait_seconds = ?wait_seconds,\n \"admin login rate limited (local backend)\"\n );\n return (\n StatusCode::TOO_MANY_REQUESTS,\n Json(AdminLoginResponse {\n success: false,\n message: if let Some(ws) = wait_seconds {\n Some(format!(\n \"Too many failed login attempts. Try again in {} seconds.\",\n ws\n ))\n } else {\n Some(\"Too many login attempts. Please try again later.\".into())\n },\n }),\n ).into_response();\n }\n }\n\n // Verify admin_key (constant-time comparison to prevent timing side-channels)\n use subtle::ConstantTimeEq as _;\n if body.admin_key.as_bytes().ct_eq(state.config.admin.api_key.as_bytes()).into() {\n // Successful login - reset rate limit counters\n if backend == \"redis\" {\n if let Some(ref redis) = state.redis_store {\n if let Err(e) = redis.reset_rate_limit_admin_login(&source_ip) {\n warn!(error = %e, \"failed to reset admin login rate limit\");\n }\n }\n } else if backend == \"local\" {\n state.local_rate_limiter.reset(&source_ip);\n }\n\n // Generate session ID and seal it\n let session_id = generate_session_id();\n let sealed = match seal_session(&session_id, &state.seal_key) {\n Ok(sealed) => sealed,\n Err(e) => {\n error!(error = %e, \"failed to seal admin session\");\n return (\n StatusCode::INTERNAL_SERVER_ERROR,\n Json(AdminLoginResponse {\n success: false,\n message: Some(\"Failed to create session\".into()),\n }),\n ).into_response();\n }\n };\n\n info!(\n source_ip_hash = hash_for_log(&source_ip),\n session_prefix = &session_id[..8],\n \"admin login successful\"\n );\n\n // Set cookie and return success\n (\n StatusCode::OK,\n [\n (\"Set-Cookie\", format!(\"{}={}; HttpOnly; Secure; SameSite=Strict; Path=/; Max-Age={}\",\n COOKIE_NAME, sealed, state.config.admin_ui.session_ttl_s)),\n ],\n Json(AdminLoginResponse {\n success: true,\n message: None,\n }),\n ).into_response()\n } else {\n // Wrong admin_key - record failure for backoff tracking\n warn!(\n source_ip_hash = hash_for_log(&source_ip),\n \"admin login failed: invalid admin_key\"\n );\n\n if backend == \"redis\" {\n if let Some(ref redis) = state.redis_store {\n let backoff_start_minutes = state.config.admin_ui.rate_limit.backoff_start_minutes;\n let backoff_max_hours = state.config.admin_ui.rate_limit.backoff_max_hours;\n let failed_threshold = state.config.admin_ui.rate_limit.failed_attempt_threshold;\n\n if let Err(e) = redis.record_failure_admin_login(\n &source_ip,\n failed_threshold,\n backoff_start_minutes,\n backoff_max_hours,\n ) {\n warn!(error = %e, \"failed to record admin login failure\");\n }\n }\n } else if backend == \"local\" {\n let backoff_start_minutes = state.config.admin_ui.rate_limit.backoff_start_minutes;\n let backoff_max_hours = state.config.admin_ui.rate_limit.backoff_max_hours;\n let failed_threshold = state.config.admin_ui.rate_limit.failed_attempt_threshold;\n\n state.local_rate_limiter.record_failure(\n &source_ip,\n failed_threshold,\n backoff_start_minutes,\n backoff_max_hours * 60,\n );\n }\n\n (\n StatusCode::UNAUTHORIZED,\n Json(AdminLoginResponse {\n success: false,\n message: Some(\"Invalid admin key\".into()),\n }),\n ).into_response()\n }\n}\n\n// ---------------------------------------------------------------------------\n// Rebalancer Admin API Endpoints (plan §4)\n// ---------------------------------------------------------------------------\n\n/// POST /_miroir/nodes — Add a node to a replica group.\n///\n/// Request body:\n/// ```json\n/// {\n/// \"id\": \"node-new\",\n/// \"address\": \"http://node-new:7700\",\n/// \"replica_group\": 0\n/// }\n/// ```\n///\n/// Implements plan §2 \"Adding a node to an existing group\":\n/// 1. Add node to topology in `Joining` state\n/// 2. Send `NodeAdded` event to rebalancer worker\n/// 3. Worker computes affected shards and starts migration with leader lease\npub async fn add_node(\n State(state): State,\n Json(body): Json,\n) -> Result, (StatusCode, String)>\nwhere\n S: Clone + Send + Sync + 'static,\n AppState: FromRef,\n{\n let app_state = AppState::from_ref(&state);\n\n let id = body.get(\"id\")\n .and_then(|v| v.as_str())\n .ok_or_else(|| (StatusCode::BAD_REQUEST, \"Missing 'id' field\".into()))?\n .to_string();\n\n let address = body.get(\"address\")\n .and_then(|v| v.as_str())\n .ok_or_else(|| (StatusCode::BAD_REQUEST, \"Missing 'address' field\".into()))?\n .to_string();\n\n let replica_group = body.get(\"replica_group\")\n .and_then(|v| v.as_u64())\n .ok_or_else(|| (StatusCode::BAD_REQUEST, \"Missing 'replica_group' field\".into()))?\n as u32;\n\n // Add node to topology\n {\n let mut topo = app_state.topology.write().await;\n // Check if node already exists\n let node_id = NodeId::new(id.clone());\n if topo.node(&node_id).is_some() {\n return Err((StatusCode::BAD_REQUEST,\n format!(\"Node {} already exists\", id)));\n }\n // Check if replica group exists\n let group_count = topo.groups().count() as u32;\n if replica_group >= group_count {\n return Err((StatusCode::BAD_REQUEST,\n format!(\"Replica group {} does not exist\", replica_group)));\n }\n let node = Node::new(node_id, address, replica_group);\n topo.add_node(node);\n }\n\n // Send event to rebalancer worker (if available)\n if let Some(ref worker) = app_state.rebalancer_worker {\n let event = TopologyChangeEvent::NodeAdded {\n node_id: id.clone(),\n replica_group,\n index_uid: \"default\".to_string(),\n };\n if let Err(e) = worker.event_sender().try_send(event) {\n error!(error = %e, node_id = %id, \"failed to send NodeAdded event to rebalancer worker\");\n return Err((StatusCode::INTERNAL_SERVER_ERROR,\n format!(\"Failed to queue rebalancing: {}\", e)));\n }\n }\n\n info!(node_id = %id, replica_group, \"Node addition queued for rebalancing\");\n Ok(Json(serde_json::json!({\n \"node_id\": id,\n \"replica_group\": replica_group,\n \"message\": format!(\"Node {} added to replica group {}, rebalancing will start shortly\", id, replica_group),\n })))\n}\n\n/// DELETE /_miroir/nodes/{id} — Remove a node from the cluster.\n///\n/// Request body (optional):\n/// ```json\n/// {\n/// \"force\": false // Set to true to bypass draining check\n/// }\n/// ```\n///\n/// Requires the node to be in `draining` state unless `force=true`.\n/// Note: This only removes the node from topology. Draining must be completed first.\npub async fn remove_node(\n State(state): State,\n Path(node_id): Path,\n Json(body): Json,\n) -> Result, (StatusCode, String)>\nwhere\n S: Clone + Send + Sync + 'static,\n AppState: FromRef,\n{\n let app_state = AppState::from_ref(&state);\n\n let force = body.get(\"force\")\n .and_then(|v| v.as_bool())\n .unwrap_or(false);\n\n let node_id_obj = NodeId::new(node_id.clone());\n\n // Check node state\n let node_status = {\n let topo = app_state.topology.read().await;\n let node = topo.node(&node_id_obj)\n .ok_or_else(|| (StatusCode::NOT_FOUND, format!(\"Node {} not found\", node_id)))?;\n\n // Check if this is the last node in the group\n let group = topo.groups()\n .find(|g| g.id == node.replica_group)\n .ok_or_else(|| (StatusCode::INTERNAL_SERVER_ERROR, format!(\"Replica group {} not found\", node.replica_group)))?;\n\n if group.nodes().len() <= 1 {\n return Err((StatusCode::BAD_REQUEST, \"Cannot remove the last node in a replica group\".into()));\n }\n\n node.status\n };\n\n if !force && node_status != miroir_core::topology::NodeStatus::Draining {\n return Err((StatusCode::BAD_REQUEST, format!(\n \"Node {} is not in draining state (current: {:?}), use force=true to bypass\",\n node_id, node_status\n ).into()));\n }\n\n // Remove node from topology\n {\n let mut topo = app_state.topology.write().await;\n topo.remove_node(&node_id_obj);\n }\n\n info!(node_id = %node_id, force, \"Node removal completed\");\n Ok(Json(serde_json::json!({\n \"node_id\": node_id,\n \"message\": format!(\"Node {} removed from cluster\", node_id),\n })))\n}\n\n/// POST /_miroir/nodes/{id}/drain — Drain a node (prepare for removal).\n///\n/// Implements plan §2 node drain flow:\n/// 1. Mark node as `draining`\n/// 2. Send `NodeDraining` event to rebalancer worker\n/// 3. Worker computes shard destinations and starts migration with leader lease\npub async fn drain_node(\n State(state): State,\n Path(node_id): Path,\n) -> Result, (StatusCode, String)>\nwhere\n S: Clone + Send + Sync + 'static,\n AppState: FromRef,\n{\n let app_state = AppState::from_ref(&state);\n\n // Check if worker is available\n let worker = app_state.rebalancer_worker.as_ref()\n .ok_or_else(|| (StatusCode::SERVICE_UNAVAILABLE, \"Rebalancer worker not initialized\".into()))?;\n\n // Get node info and mark as draining\n let replica_group = {\n let mut topo = app_state.topology.write().await;\n let node_id_obj = NodeId::new(node_id.clone());\n let node = topo.node(&node_id_obj)\n .ok_or_else(|| (StatusCode::NOT_FOUND, format!(\"Node {} not found\", node_id)))?;\n\n // Check if this is the last node in the group\n let group = topo.groups()\n .find(|g| g.id == node.replica_group)\n .ok_or_else(|| (StatusCode::INTERNAL_SERVER_ERROR, format!(\"Replica group {} not found\", node.replica_group)))?;\n\n if group.nodes().len() <= 1 {\n return Err((StatusCode::BAD_REQUEST, \"Cannot remove the last node in a replica group\".into()));\n }\n\n let replica_group = node.replica_group;\n\n // Mark node as draining\n if let Some(n) = topo.node_mut(&node_id_obj) {\n n.status = miroir_core::topology::NodeStatus::Draining;\n }\n\n replica_group\n };\n\n // Send event to rebalancer worker\n let event = TopologyChangeEvent::NodeDraining {\n node_id: node_id.clone(),\n replica_group,\n index_uid: \"default\".to_string(),\n };\n\n if let Err(e) = worker.event_sender().try_send(event) {\n error!(error = %e, node_id = %node_id, \"failed to send NodeDraining event to rebalancer worker\");\n return Err((StatusCode::INTERNAL_SERVER_ERROR, format!(\"Failed to queue drain: {}\", e)));\n }\n\n info!(node_id = %node_id, replica_group, \"Node drain queued for rebalancing\");\n Ok(Json(serde_json::json!({\n \"node_id\": node_id,\n \"replica_group\": replica_group,\n \"message\": format!(\"Node {} is draining, migrations will start shortly\", node_id),\n })))\n}\n\n/// POST /_miroir/nodes/{id}/fail — Mark a node as failed.\n///\n/// Marks a node as failed and sends a `NodeFailed` event to the rebalancer worker.\npub async fn fail_node(\n State(state): State,\n Path(node_id): Path,\n) -> Result, (StatusCode, String)>\nwhere\n S: Clone + Send + Sync + 'static,\n AppState: FromRef,\n{\n let app_state = AppState::from_ref(&state);\n\n // Check if worker is available\n let worker = app_state.rebalancer_worker.as_ref()\n .ok_or_else(|| (StatusCode::SERVICE_UNAVAILABLE, \"Rebalancer worker not initialized\".into()))?;\n\n // Get node info and mark as failed\n let replica_group = {\n let mut topo = app_state.topology.write().await;\n let node_id_obj = NodeId::new(node_id.clone());\n let node = topo.node(&node_id_obj)\n .ok_or_else(|| (StatusCode::NOT_FOUND, format!(\"Node {} not found\", node_id)))?;\n\n let replica_group = node.replica_group;\n\n // Mark node as failed\n if let Some(n) = topo.node_mut(&node_id_obj) {\n n.status = miroir_core::topology::NodeStatus::Failed;\n }\n\n replica_group\n };\n\n // Send event to rebalancer worker\n let event = TopologyChangeEvent::NodeFailed {\n node_id: node_id.clone(),\n replica_group,\n index_uid: \"default\".to_string(),\n };\n\n if let Err(e) = worker.event_sender().try_send(event) {\n error!(error = %e, node_id = %node_id, \"failed to send NodeFailed event to rebalancer worker\");\n return Err((StatusCode::INTERNAL_SERVER_ERROR, format!(\"Failed to queue node failure: {}\", e)));\n }\n\n info!(node_id = %node_id, replica_group, \"Node failure queued for handling\");\n Ok(Json(serde_json::json!({\n \"node_id\": node_id,\n \"replica_group\": replica_group,\n \"message\": format!(\"Node {} marked as failed\", node_id),\n })))\n}\n\n/// POST /_miroir/nodes/{id}/recover — Mark a failed node as recovered.\n///\n/// Marks a failed node as recovered and sends a `NodeRecovered` event to the rebalancer worker.\npub async fn recover_node(\n State(state): State,\n Path(node_id): Path,\n) -> Result, (StatusCode, String)>\nwhere\n S: Clone + Send + Sync + 'static,\n AppState: FromRef,\n{\n let app_state = AppState::from_ref(&state);\n\n // Check if worker is available\n let worker = app_state.rebalancer_worker.as_ref()\n .ok_or_else(|| (StatusCode::SERVICE_UNAVAILABLE, \"Rebalancer worker not initialized\".into()))?;\n\n // Get node info and mark as recovered\n let replica_group = {\n let mut topo = app_state.topology.write().await;\n let node_id_obj = NodeId::new(node_id.clone());\n let node = topo.node(&node_id_obj)\n .ok_or_else(|| (StatusCode::NOT_FOUND, format!(\"Node {} not found\", node_id)))?;\n\n let replica_group = node.replica_group;\n\n // Mark node as active (recovered)\n if let Some(n) = topo.node_mut(&node_id_obj) {\n n.status = miroir_core::topology::NodeStatus::Active;\n }\n\n replica_group\n };\n\n // Send event to rebalancer worker\n let event = TopologyChangeEvent::NodeRecovered {\n node_id: node_id.clone(),\n replica_group,\n index_uid: \"default\".to_string(),\n };\n\n if let Err(e) = worker.event_sender().try_send(event) {\n error!(error = %e, node_id = %node_id, \"failed to send NodeRecovered event to rebalancer worker\");\n return Err((StatusCode::INTERNAL_SERVER_ERROR, format!(\"Failed to queue node recovery: {}\", e)));\n }\n\n info!(node_id = %node_id, replica_group, \"Node recovery queued for handling\");\n Ok(Json(serde_json::json!({\n \"node_id\": node_id,\n \"replica_group\": replica_group,\n \"message\": format!(\"Node {} marked as recovered\", node_id),\n })))\n}\n\n/// GET /_miroir/rebalance/status — Get current rebalance status.\npub async fn get_rebalance_status(\n State(state): State,\n) -> Result, (StatusCode, String)>\nwhere\n S: Clone + Send + Sync + 'static,\n AppState: FromRef,\n{\n let app_state = AppState::from_ref(&state);\n\n // Get rebalancer status if available\n let rebalancer_status = if let Some(ref rebalancer) = app_state.rebalancer {\n let status = rebalancer.status().await;\n let metrics = rebalancer.metrics.read().await;\n Some(serde_json::json!({\n \"in_progress\": status.in_progress,\n \"operations\": status.operations,\n \"migrations\": status.migrations,\n \"metrics\": {\n \"documents_migrated_total\": metrics.documents_migrated_total,\n \"active_migrations\": metrics.active_migrations,\n \"current_duration_secs\": metrics.current_duration_secs(),\n },\n }))\n } else {\n None\n };\n\n // Get worker status if available\n let worker_status = if let Some(ref worker) = app_state.rebalancer_worker {\n Some(worker.get_status().await)\n } else {\n None\n };\n\n Ok(Json(serde_json::json!({\n \"rebalancer\": rebalancer_status,\n \"worker\": worker_status,\n })))\n}\n\n/// POST /_miroir/replica_groups — Add a replica group.\n///\n/// Request body:\n/// ```json\n/// {\n/// \"group_id\": 2,\n/// \"nodes\": [\n/// {\"id\": \"node-6\", \"address\": \"http://node-6:7700\"},\n/// {\"id\": \"node-7\", \"address\": \"http://node-7:7700\"}\n/// ]\n/// }\n/// ```\npub async fn add_replica_group(\n State(state): State,\n Json(body): Json,\n) -> Result, (StatusCode, String)>\nwhere\n S: Clone + Send + Sync + 'static,\n AppState: FromRef,\n{\n let app_state = AppState::from_ref(&state);\n\n let rebalancer = app_state.rebalancer.as_ref()\n .ok_or_else(|| (StatusCode::SERVICE_UNAVAILABLE, \"Rebalancer not initialized\".into()))?;\n\n let group_id = body.get(\"group_id\")\n .and_then(|v| v.as_u64())\n .ok_or_else(|| (StatusCode::BAD_REQUEST, \"Missing 'group_id' field\".into()))?\n as u32;\n\n let nodes_array = body.get(\"nodes\")\n .and_then(|v| v.as_array())\n .ok_or_else(|| (StatusCode::BAD_REQUEST, \"Missing 'nodes' field\".into()))?;\n\n let mut nodes = Vec::new();\n for node_obj in nodes_array {\n let id = node_obj.get(\"id\")\n .and_then(|v| v.as_str())\n .ok_or_else(|| (StatusCode::BAD_REQUEST, \"Missing node 'id'\".into()))?\n .to_string();\n\n let address = node_obj.get(\"address\")\n .and_then(|v| v.as_str())\n .ok_or_else(|| (StatusCode::BAD_REQUEST, \"Missing node 'address'\".into()))?\n .to_string();\n\n use miroir_core::rebalancer::GroupNodeSpec;\n nodes.push(GroupNodeSpec { id, address });\n }\n\n use miroir_core::rebalancer::AddReplicaGroupRequest;\n let request = AddReplicaGroupRequest { group_id, nodes };\n\n match rebalancer.add_replica_group(request).await {\n Ok(result) => {\n info!(group_id, \"Replica group addition completed\");\n Ok(Json(serde_json::json!({\n \"operation_id\": result.id,\n \"message\": result.message,\n })))\n }\n Err(e) => {\n error!(error = %e, group_id, \"Replica group addition failed\");\n Err((StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))\n }\n }\n}\n\n/// DELETE /_miroir/replica_groups/{id} — Remove a replica group.\npub async fn remove_replica_group(\n State(state): State,\n Path(group_id): Path,\n Json(body): Json,\n) -> Result, (StatusCode, String)>\nwhere\n S: Clone + Send + Sync + 'static,\n AppState: FromRef,\n{\n let app_state = AppState::from_ref(&state);\n\n let rebalancer = app_state.rebalancer.as_ref()\n .ok_or_else(|| (StatusCode::SERVICE_UNAVAILABLE, \"Rebalancer not initialized\".into()))?;\n\n let force = body.get(\"force\")\n .and_then(|v| v.as_bool())\n .unwrap_or(false);\n\n use miroir_core::rebalancer::RemoveReplicaGroupRequest;\n let request = RemoveReplicaGroupRequest { group_id, force };\n\n match rebalancer.remove_replica_group(request).await {\n Ok(result) => {\n info!(group_id, \"Replica group removal completed\");\n Ok(Json(serde_json::json!({\n \"operation_id\": result.id,\n \"message\": result.message,\n })))\n }\n Err(e) => {\n error!(error = %e, group_id, \"Replica group removal failed\");\n Err((StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))\n }\n }\n}\n\n#[cfg(test)]\nmod tests {\n use super::*;\n\n #[test]\n fn test_topology_response_serialization() {\n let response = TopologyResponse {\n shards: 64,\n replication_factor: 2,\n nodes: vec![\n NodeInfo {\n id: \"meili-0\".to_string(),\n address: \"http://meili-0.search.svc:7700\".to_string(),\n status: \"healthy\".to_string(),\n shard_count: 32,\n last_seen_ms: 100,\n error: None,\n },\n NodeInfo {\n id: \"meili-1\".to_string(),\n address: \"http://meili-1.search.svc:7700\".to_string(),\n status: \"degraded\".to_string(),\n shard_count: 32,\n last_seen_ms: 5000,\n error: Some(\"connection refused\".to_string()),\n },\n ],\n degraded_node_count: 1,\n rebalance_in_progress: false,\n fully_covered: false,\n };\n\n let json = serde_json::to_string(&response).unwrap();\n assert!(json.contains(\"\\\"shards\\\":64\"));\n assert!(json.contains(\"\\\"replication_factor\\\":2\"));\n assert!(json.contains(\"\\\"degraded_node_count\\\":1\"));\n assert!(json.contains(\"\\\"fully_covered\\\":false\"));\n assert!(json.contains(\"\\\"status\\\":\\\"healthy\\\"\"));\n assert!(json.contains(\"\\\"error\\\":\\\"connection refused\\\"\"));\n }\n\n #[test]\n fn test_shards_response_serialization() {\n let mut shards = HashMap::new();\n shards.insert(\"0\".to_string(), vec![\"node-0\".to_string(), \"node-1\".to_string()]);\n shards.insert(\"1\".to_string(), vec![\"node-1\".to_string(), \"node-0\".to_string()]);\n\n let response = ShardsResponse { shards };\n let json = serde_json::to_string(&response).unwrap();\n assert!(json.contains(\"\\\"0\\\"\"));\n assert!(json.contains(\"\\\"node-0\\\"\"));\n }\n\n #[test]\n fn test_node_info_with_optional_error() {\n let info = NodeInfo {\n id: \"test\".to_string(),\n address: \"http://meili-0.search.svc:7700\".to_string(),\n status: \"healthy\".to_string(),\n shard_count: 10,\n last_seen_ms: 100,\n error: None,\n };\n\n let json = serde_json::to_string(&info).unwrap();\n // error field should not be present when None\n assert!(!json.contains(\"error\"));\n }\n\n #[test]\n fn test_node_info_with_error() {\n let info = NodeInfo {\n id: \"test\".to_string(),\n address: 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Metrics tick: documents migrated counter monotonically increases\n7\t\n8\tuse super::*;\n9\tuse crate::error::Result;\n10\tuse crate::migration::{MigrationConfig, MigrationCoordinator};\n11\tuse crate::task_store::{JobRow, LeaderLeaseRow, NewJob, TaskStore, NewCanary, CanaryRow, NewCdcCursor, CdcCursorRow, NewTenantMapping, TenantMapRow, NewRolloverPolicy, RolloverPolicyRow, NewSearchUiConfig, SearchUiConfigRow, NewAdminSession, AdminSessionRow};\n12\tuse crate::topology::{Node, NodeId as TopologyNodeId, Topology};\n13\tuse std::sync::Arc;\n14\tuse tokio::sync::RwLock;\n15\t\n16\t/// Create a test topology with 4 nodes across 2 replica groups.\n17\tfn test_topology() -> Topology {\n18\t let mut topo = Topology::new(64, 2, 2);\n19\t topo.add_node(Node::new(\n20\t TopologyNodeId::new(\"node-0\".into()),\n21\t \"http://node-0:7700\".into(),\n22\t 0,\n23\t ));\n24\t topo.add_node(Node::new(\n25\t TopologyNodeId::new(\"node-1\".into()),\n26\t \"http://node-1:7700\".into(),\n27\t 0,\n28\t ));\n29\t topo.add_node(Node::new(\n30\t TopologyNodeId::new(\"node-2\".into()),\n31\t \"http://node-2:7700\".into(),\n32\t 1,\n33\t ));\n34\t topo.add_node(Node::new(\n35\t TopologyNodeId::new(\"node-3\".into()),\n36\t \"http://node-3:7700\".into(),\n37\t 1,\n38\t ));\n39\t topo\n40\t}\n41\t\n42\t/// Test helper: create an in-memory task store for testing.\n43\tstruct MockTaskStore {\n44\t jobs: Arc>>,\n45\t leader_leases: Arc>>,\n46\t}\n47\t\n48\timpl MockTaskStore {\n49\t fn new() -> Self {\n50\t Self {\n51\t jobs: Arc::new(std::sync::Mutex::new(Vec::new())),\n52\t leader_leases: Arc::new(std::sync::Mutex::new(Vec::new())),\n53\t }\n54\t }\n55\t}\n56\t\n57\timpl TaskStore for MockTaskStore {\n58\t fn migrate(&self) -> Result<()> {\n59\t Ok(())\n60\t }\n61\t\n62\t fn insert_job(&self, job: &NewJob) -> Result<()> {\n63\t let mut jobs = self.jobs.lock().unwrap();\n64\t jobs.push(JobRow {\n65\t id: job.id.clone(),\n66\t type_: job.type_.clone(),\n67\t params: job.params.clone(),\n68\t state: job.state.clone(),\n69\t claimed_by: None,\n70\t claim_expires_at: None,\n71\t progress: job.progress.clone(),\n72\t });\n73\t Ok(())\n74\t }\n75\t\n76\t fn get_job(&self, id: &str) -> Result> {\n77\t let jobs = self.jobs.lock().unwrap();\n78\t Ok(jobs.iter().find(|j| j.id == id).cloned())\n79\t }\n80\t\n81\t fn update_job_progress(&self, _id: &str, _state: &str, _progress: &str) -> Result {\n82\t Ok(true)\n83\t }\n84\t\n85\t fn list_jobs_by_state(&self, _state: &str) -> Result> {\n86\t let jobs = self.jobs.lock().unwrap();\n87\t Ok(jobs.clone())\n88\t }\n89\t\n90\t fn try_acquire_leader_lease(\n91\t &self,\n92\t scope: &str,\n93\t holder: &str,\n94\t expires_at: i64,\n95\t now_ms: i64,\n96\t ) -> Result {\n97\t let mut leases = self.leader_leases.lock().unwrap();\n98\t\n99\t // Check if there's an existing unexpired lease\n100\t for lease in leases.iter() {\n101\t // Lease is still valid if expires_at >= now_ms (>= because we can acquire at exactly the expiration time)\n102\t if lease.scope == scope && lease.expires_at >= now_ms {\n103\t if lease.holder == holder {\n104\t return Ok(true); // Already hold the lease\n105\t }\n106\t return Ok(false); // Someone else holds it\n107\t }\n108\t }\n109\t\n110\t // No existing unexpired lease - acquire it\n111\t leases.retain(|l| l.scope != scope); // Remove any expired leases for this scope\n112\t leases.push(LeaderLeaseRow {\n113\t scope: scope.to_string(),\n114\t holder: holder.to_string(),\n115\t expires_at,\n116\t });\n117\t Ok(true)\n118\t }\n119\t\n120\t fn renew_leader_lease(&self, scope: &str, holder: &str, expires_at: i64) -> Result {\n121\t let mut leases = self.leader_leases.lock().unwrap();\n122\t for lease in leases.iter_mut() {\n123\t if lease.scope == scope && lease.holder == holder {\n124\t lease.expires_at = expires_at;\n125\t return Ok(true);\n126\t }\n127\t }\n128\t Ok(false)\n129\t }\n130\t\n131\t fn get_leader_lease(&self, scope: &str) -> Result> {\n132\t let leases = self.leader_leases.lock().unwrap();\n133\t Ok(leases.iter().find(|l| l.scope == scope).cloned())\n134\t }\n135\t\n136\t // Stub implementations for unused trait methods\n137\t fn insert_task(&self, _task: &crate::task_store::NewTask) -> Result<()> {\n138\t Ok(())\n139\t }\n140\t fn get_task(&self, _miroir_id: &str) -> Result> {\n141\t Ok(None)\n142\t }\n143\t fn update_task_status(&self, _miroir_id: &str, _status: &str) -> Result {\n144\t Ok(false)\n145\t }\n146\t fn update_node_task(&self, _miroir_id: &str, _node_id: &str, _task_uid: u64) -> Result {\n147\t Ok(false)\n148\t }\n149\t fn set_task_error(&self, _miroir_id: &str, _error: &str) -> Result {\n150\t Ok(false)\n151\t }\n152\t fn list_tasks(&self, _filter: &crate::task_store::TaskFilter) -> Result> {\n153\t Ok(Vec::new())\n154\t }\n155\t fn prune_tasks(&self, _cutoff_ms: i64, _batch_size: u32) -> Result {\n156\t Ok(0)\n157\t }\n158\t fn task_count(&self) -> Result {\n159\t Ok(0)\n160\t }\n161\t fn upsert_node_settings_version(\n162\t &self,\n163\t _index_uid: &str,\n164\t _node_id: &str,\n165\t _version: i64,\n166\t _updated_at: i64,\n167\t ) -> Result<()> {\n168\t Ok(())\n169\t }\n170\t fn get_node_settings_version(\n171\t &self,\n172\t _index_uid: &str,\n173\t _node_id: &str,\n174\t ) -> Result> {\n175\t Ok(None)\n176\t }\n177\t fn create_alias(&self, _alias: &crate::task_store::NewAlias) -> Result<()> {\n178\t Ok(())\n179\t }\n180\t fn get_alias(&self, _name: &str) -> Result> {\n181\t Ok(None)\n182\t }\n183\t fn flip_alias(&self, _name: &str, _new_uid: &str, _history_retention: usize) -> Result {\n184\t Ok(false)\n185\t }\n186\t fn delete_alias(&self, _name: &str) -> Result {\n187\t Ok(false)\n188\t }\n189\t fn list_aliases(&self) -> Result> {\n190\t Ok(Vec::new())\n191\t }\n192\t fn upsert_session(&self, _session: &crate::task_store::SessionRow) -> Result<()> {\n193\t Ok(())\n194\t }\n195\t fn get_session(&self, _session_id: &str) -> Result> {\n196\t Ok(None)\n197\t }\n198\t fn delete_expired_sessions(&self, _now_ms: i64) -> Result {\n199\t Ok(0)\n200\t }\n201\t fn insert_idempotency_entry(&self, _entry: &crate::task_store::IdempotencyEntry) -> Result<()> {\n202\t Ok(())\n203\t }\n204\t fn get_idempotency_entry(&self, _key: &str) -> Result> {\n205\t Ok(None)\n206\t }\n207\t fn delete_expired_idempotency_entries(&self, _now_ms: i64) -> Result {\n208\t Ok(0)\n209\t }\n210\t fn claim_job(&self, _id: &str, _claimed_by: &str, _claim_expires_at: i64) -> Result {\n211\t Ok(false)\n212\t }\n213\t fn renew_job_claim(&self, _id: &str, _claim_expires_at: i64) -> Result {\n214\t Ok(false)\n215\t }\n216\t fn upsert_canary(&self, _canary: &crate::task_store::NewCanary) -> Result<()> {\n217\t Ok(())\n218\t }\n219\t fn get_canary(&self, _id: &str) -> Result> {\n220\t Ok(None)\n221\t }\n222\t fn list_canaries(&self) -> Result> {\n223\t Ok(Vec::new())\n224\t }\n225\t fn delete_canary(&self, _id: &str) -> Result {\n226\t Ok(false)\n227\t }\n228\t fn insert_canary_run(&self, _run: &crate::task_store::NewCanaryRun, _run_history_limit: usize) -> Result<()> {\n229\t Ok(())\n230\t }\n231\t fn get_canary_runs(&self, _canary_id: &str, _limit: usize) -> Result> {\n232\t Ok(Vec::new())\n233\t }\n234\t fn upsert_cdc_cursor(&self, _cursor: &crate::task_store::NewCdcCursor) -> Result<()> {\n235\t Ok(())\n236\t }\n237\t fn get_cdc_cursor(&self, _sink_name: &str, _index_uid: &str) -> Result> {\n238\t Ok(None)\n239\t }\n240\t fn list_cdc_cursors(&self, _sink_name: &str) -> Result> {\n241\t Ok(Vec::new())\n242\t }\n243\t fn insert_tenant_mapping(&self, _mapping: &crate::task_store::NewTenantMapping) -> Result<()> {\n244\t Ok(())\n245\t }\n246\t fn get_tenant_mapping(&self, _api_key_hash: &[u8]) -> Result> {\n247\t Ok(None)\n248\t }\n249\t fn delete_tenant_mapping(&self, _api_key_hash: &[u8]) -> Result {\n250\t Ok(false)\n251\t }\n252\t fn upsert_rollover_policy(&self, _policy: &crate::task_store::NewRolloverPolicy) -> Result<()> {\n253\t Ok(())\n254\t }\n255\t fn get_rollover_policy(&self, _name: &str) -> Result> {\n256\t Ok(None)\n257\t }\n258\t fn list_rollover_policies(&self) -> Result> {\n259\t Ok(Vec::new())\n260\t }\n261\t fn delete_rollover_policy(&self, _name: &str) -> Result {\n262\t Ok(false)\n263\t }\n264\t fn upsert_search_ui_config(&self, _config: &crate::task_store::NewSearchUiConfig) -> Result<()> {\n265\t Ok(())\n266\t }\n267\t fn get_search_ui_config(&self, _index_uid: &str) -> Result> {\n268\t Ok(None)\n269\t }\n270\t fn delete_search_ui_config(&self, _index_uid: &str) -> Result {\n271\t Ok(false)\n272\t }\n273\t fn insert_admin_session(&self, _session: &crate::task_store::NewAdminSession) -> Result<()> {\n274\t Ok(())\n275\t }\n276\t fn get_admin_session(&self, _session_id: &str) -> Result> {\n277\t Ok(None)\n278\t }\n279\t fn revoke_admin_session(&self, _session_id: &str) -> Result {\n280\t Ok(false)\n281\t }\n282\t fn delete_expired_admin_sessions(&self, _now_ms: i64) -> Result {\n283\t Ok(0)\n284\t }\n285\t}\n286\t\n287\t/// P4.1-A1: Advisory lock ensures only one pod runs the rebalancer at a time.\n288\t#[tokio::test]\n289\tasync fn p4_1_a1_advisory_lock_prevents_duplicate_migrations() {\n290\t let topo = Arc::new(RwLock::new(test_topology()));\n291\t let task_store = Arc::new(MockTaskStore::new()) as Arc;\n292\t let config = RebalancerWorkerConfig::default();\n293\t let migration_config = MigrationConfig::default();\n294\t let coordinator = Arc::new(RwLock::new(MigrationCoordinator::new(migration_config)));\n295\t let metrics = Arc::new(RwLock::new(RebalancerMetrics::default()));\n296\t\n297\t // Create two workers simulating two different pods\n298\t let worker1 = RebalancerWorker::new(\n299\t config.clone(),\n300\t topo.clone(),\n301\t task_store.clone(),\n302\t Arc::new(Rebalancer::new(\n303\t crate::rebalancer::RebalancerConfig::default(),\n304\t topo.clone(),\n305\t MigrationConfig::default(),\n306\t )),\n307\t coordinator.clone(),\n308\t metrics.clone(),\n309\t \"pod-1\".to_string(),\n310\t );\n311\t\n312\t let worker2 = RebalancerWorker::new(\n313\t config.clone(),\n314\t topo.clone(),\n315\t task_store.clone(),\n316\t Arc::new(Rebalancer::new(\n317\t crate::rebalancer::RebalancerConfig::default(),\n318\t topo.clone(),\n319\t MigrationConfig::default(),\n320\t )),\n321\t coordinator.clone(),\n322\t metrics.clone(),\n323\t \"pod-2\".to_string(),\n324\t );\n325\t\n326\t let scope = \"rebalance:test-index\";\n327\t let now = now_ms();\n328\t let expires_at = now + 10000; // 10 seconds from now\n329\t\n330\t // Pod 1 acquires the lease\n331\t let acquired1 = tokio::task::spawn_blocking({\n332\t let task_store = task_store.clone();\n333\t let scope = scope.to_string();\n334\t let holder = \"pod-1\".to_string();\n335\t move || {\n336\t task_store.try_acquire_leader_lease(&scope, &holder, expires_at, now)\n337\t }\n338\t })\n339\t .await\n340\t .unwrap()\n341\t .unwrap();\n342\t assert!(acquired1, \"pod-1 should acquire the lease\");\n343\t\n344\t // Pod 2 tries to acquire the same lease - should fail\n345\t let acquired2 = tokio::task::spawn_blocking({\n346\t let task_store = task_store.clone();\n347\t let scope = scope.to_string();\n348\t let holder = \"pod-2\".to_string();\n349\t move || {\n350\t task_store.try_acquire_leader_lease(&scope, &holder, expires_at, now)\n351\t }\n352\t })\n353\t .await\n354\t .unwrap()\n355\t .unwrap();\n356\t assert!(!acquired2, \"pod-2 should not acquire the lease while pod-1 holds it\");\n357\t\n358\t // Pod 1 can renew its lease\n359\t let renewed1 = tokio::task::spawn_blocking({\n360\t let task_store = task_store.clone();\n361\t let scope = scope.to_string();\n362\t let holder = \"pod-1\".to_string();\n363\t move || {\n364\t task_store.renew_leader_lease(&scope, &holder, expires_at + 2000)\n365\t }\n366\t })\n367\t .await\n368\t .unwrap()\n369\t .unwrap();\n370\t assert!(renewed1, \"pod-1 should renew its lease\");\n371\t\n372\t // Pod 2 still cannot acquire\n373\t let acquired2_after = tokio::task::spawn_blocking({\n374\t let task_store = task_store.clone();\n375\t let scope = scope.to_string();\n376\t let holder = \"pod-2\".to_string();\n377\t move || {\n378\t task_store.try_acquire_leader_lease(&scope, &holder, expires_at + 3000, expires_at + 2000)\n379\t }\n380\t })\n381\t .await\n382\t .unwrap()\n383\t .unwrap();\n384\t assert!(!acquired2_after, \"pod-2 should still not acquire after pod-1 renews\");\n385\t}\n386\t\n387\t/// P4.1-A2: Progress persistence allows pod restart resumption.\n388\t#[tokio::test]\n389\tasync fn p4_1_a2_progress_persistence_pods_resume_migration() {\n390\t let topo = Arc::new(RwLock::new(test_topology()));\n391\t let task_store = Arc::new(MockTaskStore::new()) as Arc;\n392\t let config = RebalancerWorkerConfig::default();\n393\t let migration_config = MigrationConfig::default();\n394\t let coordinator = Arc::new(RwLock::new(MigrationCoordinator::new(migration_config)));\n395\t let metrics = Arc::new(RwLock::new(RebalancerMetrics::default()));\n396\t\n397\t // Create a job and persist it\n398\t let job_id = RebalanceJobId::new(\"test-index\");\n399\t let mut shard_states = HashMap::new();\n400\t shard_states.insert(\n401\t 10,\n402\t ShardState {\n403\t phase: ShardMigrationPhase::MigrationInProgress,\n404\t docs_migrated: 5000,\n405\t last_offset: 5000,\n406\t source_node: Some(\"node-0\".to_string()),\n407\t target_node: \"node-1\".to_string(),\n408\t started_at: Instant::now(),\n409\t },\n410\t );\n411\t\n412\t let job = RebalanceJob {\n413\t id: job_id.clone(),\n414\t index_uid: \"test-index\".to_string(),\n415\t replica_group: 0,\n416\t shards: shard_states,\n417\t started_at: Instant::now(),\n418\t completed_at: None,\n419\t total_docs_migrated: 5000,\n420\t paused: false,\n421\t };\n422\t\n423\t // Persist the job\n424\t let progress = serde_json::to_string(&job).unwrap();\n425\t let new_job = NewJob {\n426\t id: job.id.0.clone(),\n427\t type_: \"rebalance\".to_string(),\n428\t params: progress,\n429\t state: \"running\".to_string(),\n430\t progress: \"{\\\"total_shards\\\":1,\\\"completed\\\":0,\\\"docs_migrated\\\":5000}\".to_string(),\n431\t };\n432\t tokio::task::spawn_blocking({\n433\t let task_store = task_store.clone();\n434\t let new_job = new_job.clone();\n435\t move || {\n436\t task_store.insert_job(&new_job)\n437\t }\n438\t })\n439\t .await\n440\t .unwrap()\n441\t .unwrap();\n442\t\n443\t // Create a new worker (simulating a new pod)\n444\t let worker2 = RebalancerWorker::new(\n445\t config,\n446\t topo,\n447\t task_store.clone(),\n448\t Arc::new(Rebalancer::new(\n449\t crate::rebalancer::RebalancerConfig::default(),\n450\t Arc::new(RwLock::new(test_topology())),\n451\t MigrationConfig::default(),\n452\t )),\n453\t coordinator,\n454\t metrics,\n455\t \"pod-2\".to_string(),\n456\t );\n457\t\n458\t // Load persisted jobs\n459\t worker2.load_persisted_jobs().await.unwrap();\n460\t\n461\t // Verify the job was loaded\n462\t let jobs = worker2.jobs.read().await;\n463\t let loaded_job = jobs.get(&job_id).unwrap();\n464\t assert_eq!(loaded_job.index_uid, \"test-index\");\n465\t assert_eq!(loaded_job.total_docs_migrated, 5000);\n466\t assert_eq!(loaded_job.shards.len(), 1);\n467\t\n468\t // Verify the shard state was preserved\n469\t let shard_state = loaded_job.shards.get(&10).unwrap();\n470\t assert_eq!(shard_state.docs_migrated, 5000);\n471\t assert_eq!(shard_state.last_offset, 5000);\n472\t assert!(matches!(\n473\t shard_state.phase,\n474\t ShardMigrationPhase::MigrationInProgress\n475\t ));\n476\t}\n477\t\n478\t/// P4.1-A3: Metrics tick - documents migrated counter monotonically increases.\n479\t#[tokio::test]\n480\tasync fn p4_1_a3_metrics_monotonically_increase() {\n481\t let metrics = Arc::new(RwLock::new(RebalancerMetrics::default()));\n482\t\n483\t // Start a rebalance\n484\t {\n485\t let mut m = metrics.write().await;\n486\t m.start_rebalance();\n487\t }\n488\t\n489\t // Record some documents migrated\n490\t {\n491\t let mut m = metrics.write().await;\n492\t m.record_documents_migrated(100);\n493\t m.record_documents_migrated(200);\n494\t m.record_documents_migrated(150);\n495\t }\n496\t\n497\t // Verify the counter monotonically increased\n498\t let m = metrics.read().await;\n499\t assert_eq!(m.documents_migrated_total, 450);\n500\t assert!(m.current_duration_secs() > 0.0);\n501\t\n502\t // End the rebalance and verify duration was recorded\n503\t let duration = {\n504\t let mut m = metrics.write().await;\n505\t m.end_rebalance()\n506\t };\n507\t assert!(duration > 0.0, \"duration should be positive\");\n508\t}\n509\t\n510\t/// P4.1-A4: Two workers running simultaneously produce 0 duplicate migrations.\n511\t///\n512\t/// This is a comprehensive integration test that simulates two pods\n513\t/// both running the rebalancer worker simultaneously and verifies that\n514\t/// only one actually processes topology change events (no duplicate migrations).\n515\t#[tokio::test]\n516\tasync fn p4_1_a4_two_workers_no_duplicate_migrations() {\n517\t use tokio::sync::mpsc;\n518\t use std::sync::atomic::{AtomicU32, Ordering};\n519\t\n520\t let topo = Arc::new(RwLock::new(test_topology()));\n521\t let task_store = Arc::new(MockTaskStore::new()) as Arc;\n522\t let config = RebalancerWorkerConfig {\n523\t lease_ttl_secs: 5,\n524\t lease_renewal_interval_ms: 100,\n525\t event_channel_capacity: 10,\n526\t ..Default::default()\n527\t };\n528\t let migration_config = MigrationConfig::default();\n529\t let coordinator = Arc::new(RwLock::new(MigrationCoordinator::new(migration_config)));\n530\t let metrics = Arc::new(RwLock::new(RebalancerMetrics::default()));\n531\t\n532\t // Counter to track how many times migrations were processed\n533\t let migrations_processed = Arc::new(AtomicU32::new(0));\n534\t\n535\t // Create two workers with different pod IDs\n536\t let worker1 = RebalancerWorker::new(\n537\t config.clone(),\n538\t topo.clone(),\n539\t task_store.clone(),\n540\t Arc::new(Rebalancer::new(\n541\t crate::rebalancer::RebalancerConfig::default(),\n542\t topo.clone(),\n543\t MigrationConfig::default(),\n544\t )),\n545\t coordinator.clone(),\n546\t metrics.clone(),\n547\t \"pod-1\".to_string(),\n548\t );\n549\t\n550\t let worker2 = RebalancerWorker::new(\n551\t config.clone(),\n552\t topo.clone(),\n553\t task_store.clone(),\n554\t Arc::new(Rebalancer::new(\n555\t crate::rebalancer::RebalancerConfig::default(),\n556\t topo.clone(),\n557\t MigrationConfig::default(),\n558\t )),\n559\t coordinator.clone(),\n560\t metrics.clone(),\n561\t \"pod-2\".to_string(),\n562\t );\n563\t\n564\t // Simulate pod-1 acquiring the lease first\n565\t let scope = \"rebalance:test-duplicate-index\";\n566\t let now = now_ms();\n567\t let expires_at = now + 5000; // 5 seconds from now\n568\t\n569\t let pod1_acquired = tokio::task::spawn_blocking({\n570\t let task_store = task_store.clone();\n571\t let scope = scope.to_string();\n572\t let holder = \"pod-1\".to_string();\n573\t move || {\n574\t task_store.try_acquire_leader_lease(&scope, &holder, expires_at, now)\n575\t }\n576\t })\n577\t .await\n578\t .unwrap()\n579\t .unwrap();\n580\t assert!(pod1_acquired, \"pod-1 should acquire the lease first\");\n581\t\n582\t // Pod-2 tries to acquire - should fail\n583\t let pod2_acquired = tokio::task::spawn_blocking({\n584\t let task_store = task_store.clone();\n585\t let scope = scope.to_string();\n586\t let holder = \"pod-2\".to_string();\n587\t move || {\n588\t task_store.try_acquire_leader_lease(&scope, &holder, expires_at, now)\n589\t }\n590\t })\n591\t .await\n592\t .unwrap()\n593\t .unwrap();\n594\t assert!(!pod2_acquired, \"pod-2 should not acquire lease while pod-1 holds it\");\n595\t\n596\t // Now simulate a scenario where both pods try to process the same topology event\n597\t // Only pod-1 (the lease holder) should actually process it\n598\t let event_tx_1 = worker1.event_sender();\n599\t let event_tx_2 = worker2.event_sender();\n600\t\n601\t // Send the same event through both workers\n602\t let event = TopologyChangeEvent::NodeAdded {\n603\t node_id: \"node-new\".to_string(),\n604\t replica_group: 0,\n605\t index_uid: \"test-duplicate-index\".to_string(),\n606\t };\n607\t\n608\t // Both workers receive the event\n609\t event_tx_1.send(event.clone()).await.unwrap();\n610\t event_tx_2.send(event).await.unwrap();\n611\t\n612\t // Give time for processing\n613\t tokio::time::sleep(tokio::time::Duration::from_millis(100)).await;\n614\t\n615\t // Verify that only one migration was created (not two duplicates)\n616\t let coordinator_read = coordinator.read().await;\n617\t let migration_count = coordinator_read.get_all_migrations().len();\n618\t assert_eq!(migration_count, 1, \"only one migration should be created, not duplicates\");\n619\t}\n620\t\n621\t/// Helper to get current time in milliseconds.\n622\tfn now_ms() -> i64 {\n623\t std::time::SystemTime::now()\n624\t .duration_since(std::time::UNIX_EPOCH)\n625\t .unwrap_or_default()\n626\t .as_millis() as i64\n627\t}\n628\t"}]},"parent_tool_use_id":null,"session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"317eadfb-cd85-479c-92d0-916fe74c1b40","timestamp":"2026-05-23T06:38:59.925Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/miroir/crates/miroir-core/src/rebalancer_worker/acceptance_tests.rs","content":"//! Acceptance tests for the rebalancer worker (P4.1).\n//!\n//! These tests verify the three key acceptance criteria:\n//! 1. Advisory lock: only one pod runs the rebalancer at a time\n//! 2. Progress persistence: pod restart resumes without starting over\n//! 3. Metrics tick: documents migrated counter monotonically increases\n\nuse super::*;\nuse crate::error::Result;\nuse crate::migration::{MigrationConfig, MigrationCoordinator};\nuse crate::task_store::{JobRow, LeaderLeaseRow, NewJob, TaskStore, NewCanary, CanaryRow, NewCdcCursor, CdcCursorRow, NewTenantMapping, TenantMapRow, NewRolloverPolicy, RolloverPolicyRow, NewSearchUiConfig, SearchUiConfigRow, NewAdminSession, AdminSessionRow};\nuse crate::topology::{Node, NodeId as TopologyNodeId, Topology};\nuse std::sync::Arc;\nuse tokio::sync::RwLock;\n\n/// Create a test topology with 4 nodes across 2 replica groups.\nfn test_topology() -> Topology {\n let mut topo = Topology::new(64, 2, 2);\n topo.add_node(Node::new(\n TopologyNodeId::new(\"node-0\".into()),\n \"http://node-0:7700\".into(),\n 0,\n ));\n topo.add_node(Node::new(\n TopologyNodeId::new(\"node-1\".into()),\n \"http://node-1:7700\".into(),\n 0,\n ));\n topo.add_node(Node::new(\n TopologyNodeId::new(\"node-2\".into()),\n \"http://node-2:7700\".into(),\n 1,\n ));\n topo.add_node(Node::new(\n TopologyNodeId::new(\"node-3\".into()),\n \"http://node-3:7700\".into(),\n 1,\n ));\n topo\n}\n\n/// Test helper: create an in-memory task store for testing.\nstruct MockTaskStore {\n jobs: Arc>>,\n leader_leases: Arc>>,\n}\n\nimpl MockTaskStore {\n fn new() -> Self {\n Self {\n jobs: Arc::new(std::sync::Mutex::new(Vec::new())),\n leader_leases: Arc::new(std::sync::Mutex::new(Vec::new())),\n }\n }\n}\n\nimpl TaskStore for MockTaskStore {\n fn migrate(&self) -> Result<()> {\n Ok(())\n }\n\n fn insert_job(&self, job: &NewJob) -> Result<()> {\n let mut jobs = self.jobs.lock().unwrap();\n jobs.push(JobRow {\n id: job.id.clone(),\n type_: job.type_.clone(),\n params: job.params.clone(),\n state: job.state.clone(),\n claimed_by: None,\n claim_expires_at: None,\n progress: job.progress.clone(),\n });\n Ok(())\n }\n\n fn get_job(&self, id: &str) -> Result> {\n let jobs = self.jobs.lock().unwrap();\n Ok(jobs.iter().find(|j| j.id == id).cloned())\n }\n\n fn update_job_progress(&self, _id: &str, _state: &str, _progress: &str) -> Result {\n Ok(true)\n }\n\n fn list_jobs_by_state(&self, _state: &str) -> Result> {\n let jobs = self.jobs.lock().unwrap();\n Ok(jobs.clone())\n }\n\n fn try_acquire_leader_lease(\n &self,\n scope: &str,\n holder: &str,\n expires_at: i64,\n now_ms: i64,\n ) -> Result {\n let mut leases = self.leader_leases.lock().unwrap();\n\n // Check if there's an existing unexpired lease\n for lease in leases.iter() {\n // Lease is still valid if expires_at >= now_ms (>= because we can acquire at exactly the expiration time)\n if lease.scope == scope && lease.expires_at >= now_ms {\n if lease.holder == holder {\n return Ok(true); // Already hold the lease\n }\n return Ok(false); // Someone else holds it\n }\n }\n\n // No existing unexpired lease - acquire it\n leases.retain(|l| l.scope != scope); // Remove any expired leases for this scope\n leases.push(LeaderLeaseRow {\n scope: scope.to_string(),\n holder: holder.to_string(),\n expires_at,\n });\n Ok(true)\n }\n\n fn renew_leader_lease(&self, scope: &str, holder: &str, expires_at: i64) -> Result {\n let mut leases = self.leader_leases.lock().unwrap();\n for lease in leases.iter_mut() {\n if lease.scope == scope && lease.holder == holder {\n lease.expires_at = expires_at;\n return Ok(true);\n }\n }\n Ok(false)\n }\n\n fn get_leader_lease(&self, scope: &str) -> Result> {\n let leases = self.leader_leases.lock().unwrap();\n Ok(leases.iter().find(|l| l.scope == scope).cloned())\n }\n\n // Stub implementations for unused trait methods\n fn insert_task(&self, _task: &crate::task_store::NewTask) -> Result<()> {\n Ok(())\n }\n fn get_task(&self, _miroir_id: &str) -> Result> {\n Ok(None)\n }\n fn update_task_status(&self, _miroir_id: &str, _status: &str) -> Result {\n Ok(false)\n }\n fn update_node_task(&self, _miroir_id: &str, _node_id: &str, _task_uid: u64) -> Result {\n Ok(false)\n }\n fn set_task_error(&self, _miroir_id: &str, _error: &str) -> Result {\n Ok(false)\n }\n fn list_tasks(&self, _filter: &crate::task_store::TaskFilter) -> Result> {\n Ok(Vec::new())\n }\n fn prune_tasks(&self, _cutoff_ms: i64, _batch_size: u32) -> Result {\n Ok(0)\n }\n fn task_count(&self) -> Result {\n Ok(0)\n }\n fn upsert_node_settings_version(\n &self,\n _index_uid: &str,\n _node_id: &str,\n _version: i64,\n _updated_at: i64,\n ) -> Result<()> {\n Ok(())\n }\n fn get_node_settings_version(\n &self,\n _index_uid: &str,\n _node_id: &str,\n ) -> Result> {\n Ok(None)\n }\n fn create_alias(&self, _alias: &crate::task_store::NewAlias) -> Result<()> {\n Ok(())\n }\n fn get_alias(&self, _name: &str) -> Result> {\n Ok(None)\n }\n fn flip_alias(&self, _name: &str, _new_uid: &str, _history_retention: usize) -> Result {\n Ok(false)\n }\n fn delete_alias(&self, _name: &str) -> Result {\n Ok(false)\n }\n fn list_aliases(&self) -> Result> {\n Ok(Vec::new())\n }\n fn upsert_session(&self, _session: &crate::task_store::SessionRow) -> Result<()> {\n Ok(())\n }\n fn get_session(&self, _session_id: &str) -> Result> {\n Ok(None)\n }\n fn delete_expired_sessions(&self, _now_ms: i64) -> Result {\n Ok(0)\n }\n fn insert_idempotency_entry(&self, _entry: &crate::task_store::IdempotencyEntry) -> Result<()> {\n Ok(())\n }\n fn get_idempotency_entry(&self, _key: &str) -> Result> {\n Ok(None)\n }\n fn delete_expired_idempotency_entries(&self, _now_ms: i64) -> Result {\n Ok(0)\n }\n fn claim_job(&self, _id: &str, _claimed_by: &str, _claim_expires_at: i64) -> Result {\n Ok(false)\n }\n fn renew_job_claim(&self, _id: &str, _claim_expires_at: i64) -> Result {\n Ok(false)\n }\n fn upsert_canary(&self, _canary: &crate::task_store::NewCanary) -> Result<()> {\n Ok(())\n }\n fn get_canary(&self, _id: &str) -> Result> {\n Ok(None)\n }\n fn list_canaries(&self) -> Result> {\n Ok(Vec::new())\n }\n fn delete_canary(&self, _id: &str) -> Result {\n Ok(false)\n }\n fn insert_canary_run(&self, _run: &crate::task_store::NewCanaryRun, _run_history_limit: usize) -> Result<()> {\n Ok(())\n }\n fn get_canary_runs(&self, _canary_id: &str, _limit: usize) -> Result> {\n Ok(Vec::new())\n }\n fn upsert_cdc_cursor(&self, _cursor: &crate::task_store::NewCdcCursor) -> Result<()> {\n Ok(())\n }\n fn get_cdc_cursor(&self, _sink_name: &str, _index_uid: &str) -> Result> {\n Ok(None)\n }\n fn list_cdc_cursors(&self, _sink_name: &str) -> Result> {\n Ok(Vec::new())\n }\n fn insert_tenant_mapping(&self, _mapping: &crate::task_store::NewTenantMapping) -> Result<()> {\n Ok(())\n }\n fn get_tenant_mapping(&self, _api_key_hash: &[u8]) -> Result> {\n Ok(None)\n }\n fn delete_tenant_mapping(&self, _api_key_hash: &[u8]) -> Result {\n Ok(false)\n }\n fn upsert_rollover_policy(&self, _policy: &crate::task_store::NewRolloverPolicy) -> Result<()> {\n Ok(())\n }\n fn get_rollover_policy(&self, _name: &str) -> Result> {\n Ok(None)\n }\n fn list_rollover_policies(&self) -> Result> {\n Ok(Vec::new())\n }\n fn delete_rollover_policy(&self, _name: &str) -> Result {\n Ok(false)\n }\n fn upsert_search_ui_config(&self, _config: &crate::task_store::NewSearchUiConfig) -> Result<()> {\n Ok(())\n }\n fn get_search_ui_config(&self, _index_uid: &str) -> Result> {\n Ok(None)\n }\n fn delete_search_ui_config(&self, _index_uid: &str) -> Result {\n Ok(false)\n }\n fn insert_admin_session(&self, _session: &crate::task_store::NewAdminSession) -> Result<()> {\n Ok(())\n }\n fn get_admin_session(&self, _session_id: &str) -> Result> {\n Ok(None)\n }\n fn revoke_admin_session(&self, _session_id: &str) -> Result {\n Ok(false)\n }\n fn delete_expired_admin_sessions(&self, _now_ms: i64) -> Result {\n Ok(0)\n }\n}\n\n/// P4.1-A1: Advisory lock ensures only one pod runs the rebalancer at a time.\n#[tokio::test]\nasync fn p4_1_a1_advisory_lock_prevents_duplicate_migrations() {\n let topo = Arc::new(RwLock::new(test_topology()));\n let task_store = Arc::new(MockTaskStore::new()) as Arc;\n let config = RebalancerWorkerConfig::default();\n let migration_config = MigrationConfig::default();\n let coordinator = Arc::new(RwLock::new(MigrationCoordinator::new(migration_config)));\n let metrics = Arc::new(RwLock::new(RebalancerMetrics::default()));\n\n // Create two workers simulating two different pods\n let worker1 = RebalancerWorker::new(\n config.clone(),\n topo.clone(),\n task_store.clone(),\n Arc::new(Rebalancer::new(\n crate::rebalancer::RebalancerConfig::default(),\n topo.clone(),\n MigrationConfig::default(),\n )),\n coordinator.clone(),\n metrics.clone(),\n \"pod-1\".to_string(),\n );\n\n let worker2 = RebalancerWorker::new(\n config.clone(),\n topo.clone(),\n task_store.clone(),\n Arc::new(Rebalancer::new(\n crate::rebalancer::RebalancerConfig::default(),\n topo.clone(),\n MigrationConfig::default(),\n )),\n coordinator.clone(),\n metrics.clone(),\n \"pod-2\".to_string(),\n );\n\n let scope = \"rebalance:test-index\";\n let now = now_ms();\n let expires_at = now + 10000; // 10 seconds from now\n\n // Pod 1 acquires the lease\n let acquired1 = tokio::task::spawn_blocking({\n let task_store = task_store.clone();\n let scope = scope.to_string();\n let holder = \"pod-1\".to_string();\n move || {\n task_store.try_acquire_leader_lease(&scope, &holder, expires_at, now)\n }\n })\n .await\n .unwrap()\n .unwrap();\n assert!(acquired1, \"pod-1 should acquire the lease\");\n\n // Pod 2 tries to acquire the same lease - should fail\n let acquired2 = tokio::task::spawn_blocking({\n let task_store = task_store.clone();\n let scope = scope.to_string();\n let holder = \"pod-2\".to_string();\n move || {\n task_store.try_acquire_leader_lease(&scope, &holder, expires_at, now)\n }\n })\n .await\n .unwrap()\n .unwrap();\n assert!(!acquired2, \"pod-2 should not acquire the lease while pod-1 holds it\");\n\n // Pod 1 can renew its lease\n let renewed1 = tokio::task::spawn_blocking({\n let task_store = task_store.clone();\n let scope = scope.to_string();\n let holder = \"pod-1\".to_string();\n move || {\n task_store.renew_leader_lease(&scope, &holder, expires_at + 2000)\n }\n })\n .await\n .unwrap()\n .unwrap();\n assert!(renewed1, \"pod-1 should renew its lease\");\n\n // Pod 2 still cannot acquire\n let acquired2_after = tokio::task::spawn_blocking({\n let task_store = task_store.clone();\n let scope = scope.to_string();\n let holder = \"pod-2\".to_string();\n move || {\n task_store.try_acquire_leader_lease(&scope, &holder, expires_at + 3000, expires_at + 2000)\n }\n })\n .await\n .unwrap()\n .unwrap();\n assert!(!acquired2_after, \"pod-2 should still not acquire after pod-1 renews\");\n}\n\n/// P4.1-A2: Progress persistence allows pod restart resumption.\n#[tokio::test]\nasync fn p4_1_a2_progress_persistence_pods_resume_migration() {\n let topo = Arc::new(RwLock::new(test_topology()));\n let task_store = Arc::new(MockTaskStore::new()) as Arc;\n let config = RebalancerWorkerConfig::default();\n let migration_config = MigrationConfig::default();\n let coordinator = Arc::new(RwLock::new(MigrationCoordinator::new(migration_config)));\n let metrics = Arc::new(RwLock::new(RebalancerMetrics::default()));\n\n // Create a job and persist it\n let job_id = RebalanceJobId::new(\"test-index\");\n let mut shard_states = HashMap::new();\n shard_states.insert(\n 10,\n ShardState {\n phase: ShardMigrationPhase::MigrationInProgress,\n docs_migrated: 5000,\n last_offset: 5000,\n source_node: Some(\"node-0\".to_string()),\n target_node: \"node-1\".to_string(),\n started_at: Instant::now(),\n },\n );\n\n let job = RebalanceJob {\n id: job_id.clone(),\n index_uid: \"test-index\".to_string(),\n replica_group: 0,\n shards: shard_states,\n started_at: Instant::now(),\n completed_at: None,\n total_docs_migrated: 5000,\n paused: false,\n };\n\n // Persist the job\n let progress = serde_json::to_string(&job).unwrap();\n let new_job = NewJob {\n id: job.id.0.clone(),\n type_: \"rebalance\".to_string(),\n params: progress,\n state: \"running\".to_string(),\n progress: \"{\\\"total_shards\\\":1,\\\"completed\\\":0,\\\"docs_migrated\\\":5000}\".to_string(),\n };\n tokio::task::spawn_blocking({\n let task_store = task_store.clone();\n let new_job = new_job.clone();\n move || {\n task_store.insert_job(&new_job)\n }\n })\n .await\n .unwrap()\n .unwrap();\n\n // Create a new worker (simulating a new pod)\n let worker2 = RebalancerWorker::new(\n config,\n topo,\n task_store.clone(),\n Arc::new(Rebalancer::new(\n crate::rebalancer::RebalancerConfig::default(),\n Arc::new(RwLock::new(test_topology())),\n MigrationConfig::default(),\n )),\n coordinator,\n metrics,\n \"pod-2\".to_string(),\n );\n\n // Load persisted jobs\n worker2.load_persisted_jobs().await.unwrap();\n\n // Verify the job was loaded\n let jobs = worker2.jobs.read().await;\n let loaded_job = jobs.get(&job_id).unwrap();\n assert_eq!(loaded_job.index_uid, \"test-index\");\n assert_eq!(loaded_job.total_docs_migrated, 5000);\n assert_eq!(loaded_job.shards.len(), 1);\n\n // Verify the shard state was preserved\n let shard_state = loaded_job.shards.get(&10).unwrap();\n assert_eq!(shard_state.docs_migrated, 5000);\n assert_eq!(shard_state.last_offset, 5000);\n assert!(matches!(\n shard_state.phase,\n ShardMigrationPhase::MigrationInProgress\n ));\n}\n\n/// P4.1-A3: Metrics tick - documents migrated counter monotonically increases.\n#[tokio::test]\nasync fn p4_1_a3_metrics_monotonically_increase() {\n let metrics = Arc::new(RwLock::new(RebalancerMetrics::default()));\n\n // Start a rebalance\n {\n let mut m = metrics.write().await;\n m.start_rebalance();\n }\n\n // Record some documents migrated\n {\n let mut m = metrics.write().await;\n m.record_documents_migrated(100);\n m.record_documents_migrated(200);\n m.record_documents_migrated(150);\n }\n\n // Verify the counter monotonically increased\n let m = metrics.read().await;\n assert_eq!(m.documents_migrated_total, 450);\n assert!(m.current_duration_secs() > 0.0);\n\n // End the rebalance and verify duration was recorded\n let duration = {\n let mut m = metrics.write().await;\n m.end_rebalance()\n };\n assert!(duration > 0.0, \"duration should be positive\");\n}\n\n/// P4.1-A4: Two workers running simultaneously produce 0 duplicate migrations.\n///\n/// This is a comprehensive integration test that simulates two pods\n/// both running the rebalancer worker simultaneously and verifies that\n/// only one actually processes topology change events (no duplicate migrations).\n#[tokio::test]\nasync fn p4_1_a4_two_workers_no_duplicate_migrations() {\n use tokio::sync::mpsc;\n use std::sync::atomic::{AtomicU32, Ordering};\n\n let topo = Arc::new(RwLock::new(test_topology()));\n let task_store = Arc::new(MockTaskStore::new()) as Arc;\n let config = RebalancerWorkerConfig {\n lease_ttl_secs: 5,\n lease_renewal_interval_ms: 100,\n event_channel_capacity: 10,\n ..Default::default()\n };\n let migration_config = MigrationConfig::default();\n let coordinator = Arc::new(RwLock::new(MigrationCoordinator::new(migration_config)));\n let metrics = Arc::new(RwLock::new(RebalancerMetrics::default()));\n\n // Counter to track how many times migrations were processed\n let migrations_processed = Arc::new(AtomicU32::new(0));\n\n // Create two workers with different pod IDs\n let worker1 = RebalancerWorker::new(\n config.clone(),\n topo.clone(),\n task_store.clone(),\n Arc::new(Rebalancer::new(\n crate::rebalancer::RebalancerConfig::default(),\n topo.clone(),\n MigrationConfig::default(),\n )),\n coordinator.clone(),\n metrics.clone(),\n \"pod-1\".to_string(),\n );\n\n let worker2 = RebalancerWorker::new(\n config.clone(),\n topo.clone(),\n task_store.clone(),\n Arc::new(Rebalancer::new(\n crate::rebalancer::RebalancerConfig::default(),\n topo.clone(),\n MigrationConfig::default(),\n )),\n coordinator.clone(),\n metrics.clone(),\n \"pod-2\".to_string(),\n );\n\n // Simulate pod-1 acquiring the lease first\n let scope = \"rebalance:test-duplicate-index\";\n let now = now_ms();\n let expires_at = now + 5000; // 5 seconds from now\n\n let pod1_acquired = tokio::task::spawn_blocking({\n let task_store = task_store.clone();\n let scope = scope.to_string();\n let holder = \"pod-1\".to_string();\n move || {\n task_store.try_acquire_leader_lease(&scope, &holder, expires_at, now)\n }\n })\n .await\n .unwrap()\n .unwrap();\n assert!(pod1_acquired, \"pod-1 should acquire the lease first\");\n\n // Pod-2 tries to acquire - should fail\n let pod2_acquired = tokio::task::spawn_blocking({\n let task_store = task_store.clone();\n let scope = scope.to_string();\n let holder = \"pod-2\".to_string();\n move || {\n task_store.try_acquire_leader_lease(&scope, &holder, expires_at, now)\n }\n })\n .await\n .unwrap()\n .unwrap();\n assert!(!pod2_acquired, \"pod-2 should not acquire lease while pod-1 holds it\");\n\n // Now simulate a scenario where both pods try to process the same topology event\n // Only pod-1 (the lease holder) should actually process it\n let event_tx_1 = worker1.event_sender();\n let event_tx_2 = worker2.event_sender();\n\n // Send the same event through both workers\n let event = TopologyChangeEvent::NodeAdded {\n node_id: \"node-new\".to_string(),\n replica_group: 0,\n index_uid: \"test-duplicate-index\".to_string(),\n };\n\n // Both workers receive the event\n event_tx_1.send(event.clone()).await.unwrap();\n event_tx_2.send(event).await.unwrap();\n\n // Give time for processing\n tokio::time::sleep(tokio::time::Duration::from_millis(100)).await;\n\n // Verify that only one migration was created (not two duplicates)\n let coordinator_read = coordinator.read().await;\n let migration_count = coordinator_read.get_all_migrations().len();\n assert_eq!(migration_count, 1, \"only one migration should be created, not duplicates\");\n}\n\n/// Helper to get current time in milliseconds.\nfn now_ms() -> i64 {\n std::time::SystemTime::now()\n .duration_since(std::time::UNIX_EPOCH)\n .unwrap_or_default()\n .as_millis() as i64\n}\n","numLines":628,"startLine":1,"totalLines":628}}} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_5dc0f8b1aae24a31b4519875","type":"tool_result","content":"192: rebalance_in_progress: Gauge,\n193: rebalance_documents_migrated: Counter,\n194: rebalance_duration: Histogram,\n307: rebalance_in_progress: self.rebalance_in_progress.clone(),\n308: rebalance_documents_migrated: self.rebalance_documents_migrated.clone(),\n309: rebalance_duration: self.rebalance_duration.clone(),\n475: let rebalance_in_progress = Gauge::with_opts(\n476: Opts::new(\"miroir_rebalance_in_progress\", \"Whether a rebalance is currently running (1=yes, 0=no)\"),\n478: .expect(\"failed to create rebalance_in_progress gauge\");\n480: let rebalance_documents_migrated = Counter::with_opts(\n481: Opts::new(\"miroir_rebalance_documents_migrated_total\", \"Total number of documents migrated during rebalance\"),\n483: .expect(\"failed to create rebalance_documents_migrated counter\");\n485: let rebalance_duration = Histogram::with_opts(\n486: HistogramOpts::new(\"miroir_rebalance_duration_seconds\", \"Duration of rebalance operations\")\n489: .expect(\"failed to create rebalance_duration histogram\");\n513: reg!(rebalance_in_progress);\n514: reg!(rebalance_documents_migrated);\n515: reg!(rebalance_duration);\n927: rebalance_in_progress,\n928: rebalance_documents_migrated,\n929: rebalance_duration,\n1290: pub fn set_rebalance_in_progress(&self, v: bool) {\n1291: self.rebalance_in_progress.set(if v { 1.0 } else { 0.0 });\n1294: pub fn inc_rebalance_documents_migrated(&self, count: u64) {\n1295: self.rebalance_documents_migrated.inc_by(count as f64);\n1298: pub fn observe_rebalance_duration(&self, secs: f64) {\n1299: self.rebalance_duration.observe(secs);\n1700: metrics.rebalance_in_progress.set(0.0);\n1701: metrics.rebalance_documents_migrated.inc();\n1702: metrics.rebalance_duration.observe(10.0);\n1739: metrics.set_background_queue_depth(\"rebalance\", 5);\n1773: \"miroir_rebalance_in_progress\",\n1774: \"miroir_rebalance_documents_migrated_total\",\n1775: \"miroir_rebalance_duration_seconds\",\n1865: assert!(encoded.contains(\"miroir_rebalance_duration_seconds\"));"}]},"parent_tool_use_id":null,"session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"54c3df3c-8353-4acb-9d87-6d71ea8b9e74","timestamp":"2026-05-23T06:38:59.927Z","tool_use_result":{"mode":"content","numFiles":0,"filenames":[],"content":"192: rebalance_in_progress: Gauge,\n193: rebalance_documents_migrated: Counter,\n194: rebalance_duration: Histogram,\n307: rebalance_in_progress: self.rebalance_in_progress.clone(),\n308: rebalance_documents_migrated: self.rebalance_documents_migrated.clone(),\n309: rebalance_duration: self.rebalance_duration.clone(),\n475: let rebalance_in_progress = Gauge::with_opts(\n476: Opts::new(\"miroir_rebalance_in_progress\", \"Whether a rebalance is currently running (1=yes, 0=no)\"),\n478: .expect(\"failed to create rebalance_in_progress gauge\");\n480: let rebalance_documents_migrated = Counter::with_opts(\n481: Opts::new(\"miroir_rebalance_documents_migrated_total\", \"Total number of documents migrated during rebalance\"),\n483: .expect(\"failed to create rebalance_documents_migrated counter\");\n485: let rebalance_duration = Histogram::with_opts(\n486: HistogramOpts::new(\"miroir_rebalance_duration_seconds\", \"Duration of rebalance operations\")\n489: .expect(\"failed to create rebalance_duration histogram\");\n513: reg!(rebalance_in_progress);\n514: reg!(rebalance_documents_migrated);\n515: reg!(rebalance_duration);\n927: rebalance_in_progress,\n928: rebalance_documents_migrated,\n929: rebalance_duration,\n1290: pub fn set_rebalance_in_progress(&self, v: bool) {\n1291: self.rebalance_in_progress.set(if v { 1.0 } else { 0.0 });\n1294: pub fn inc_rebalance_documents_migrated(&self, count: u64) {\n1295: self.rebalance_documents_migrated.inc_by(count as f64);\n1298: pub fn observe_rebalance_duration(&self, secs: f64) {\n1299: self.rebalance_duration.observe(secs);\n1700: metrics.rebalance_in_progress.set(0.0);\n1701: metrics.rebalance_documents_migrated.inc();\n1702: metrics.rebalance_duration.observe(10.0);\n1739: metrics.set_background_queue_depth(\"rebalance\", 5);\n1773: \"miroir_rebalance_in_progress\",\n1774: \"miroir_rebalance_documents_migrated_total\",\n1775: \"miroir_rebalance_duration_seconds\",\n1865: assert!(encoded.contains(\"miroir_rebalance_duration_seconds\"));","numLines":35}} +{"type":"system","subtype":"status","status":"requesting","uuid":"5ab37d95-05d6-4ca5-abb2-36e447574722","session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39"} 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Let me verify the tests pass:"}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":null,"session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"d321be68-9135-42ff-b50e-8a65ef63c149"} +{"type":"stream_event","event":{"type":"content_block_stop","index":1},"session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","parent_tool_use_id":null,"uuid":"4f2620ee-6d20-4fdf-8c57-711f156b35c2"} +{"type":"stream_event","event":{"type":"content_block_start","index":2,"content_block":{"type":"tool_use","id":"call_7d3d349820594f02ad87bfa3","name":"Bash","input":{}}},"session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","parent_tool_use_id":null,"uuid":"b475f62e-b69e-4e5f-90fc-63d9fbe1a9f9"} +{"type":"stream_event","event":{"type":"content_block_delta","index":2,"delta":{"type":"input_json_delta","partial_json":"{\"command\":\"cargo test -p miroir-core --test rebalancer_worker_acceptance_tests --lib -- --nocapture 2>&1 | 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available test targets:\n cutover_race\n dfs_skewed_corpus\n p13_7_alias_acceptance_tests\n p22_write_path\n p23_search_read_path\n p3_redis_integration\n p3_sqlite_restart\n p3_task_store_proptest\n p42_node_addition\n p4_topology_chaos\n router_proptest","is_error":false}]},"parent_tool_use_id":null,"session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"68a991f2-e404-468f-91a8-b0be576bc374","timestamp":"2026-05-23T06:39:07.227Z","tool_use_result":{"stdout":"error: no test target named `rebalancer_worker_acceptance_tests` in `miroir-core` package\nhelp: available test targets:\n cutover_race\n dfs_skewed_corpus\n p13_7_alias_acceptance_tests\n p22_write_path\n p23_search_read_path\n p3_redis_integration\n p3_sqlite_restart\n p3_task_store_proptest\n p42_node_addition\n p4_topology_chaos\n router_proptest","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false}} 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rebalancer_worker::acceptance_tests --lib -- --nocapture 2>&1 | head -150","description":"Run rebalancer worker acceptance tests","timeout":120000}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":null,"session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"ca9c06c2-d150-4f9e-96ec-3f0366234451"} +{"type":"stream_event","event":{"type":"content_block_stop","index":1},"session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","parent_tool_use_id":null,"uuid":"088f88b5-f532-4c5f-bf60-a716bb38968c"} +{"type":"stream_event","event":{"type":"message_delta","delta":{"stop_reason":"tool_use","stop_sequence":null},"usage":{"input_tokens":504,"output_tokens":72,"cache_read_input_tokens":84864,"server_tool_use":{"web_search_requests":0},"service_tier":"standard"}},"session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","parent_tool_use_id":null,"uuid":"e2a0eff2-165e-4aa9-8eb6-137a80a3b26b"} +{"type":"stream_event","event":{"type":"message_stop"},"session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","parent_tool_use_id":null,"uuid":"f75581c2-131f-4aac-ac91-e0c591668b49"} +{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_6fcd60714a534903be60c14f","type":"tool_result","content":"warning: unused import: `AliasHistoryEntry`\n --> crates/miroir-core/src/alias/acceptance_tests.rs:150:46\n |\n150 | use crate::task_store::{SqliteTaskStore, AliasHistoryEntry};\n | ^^^^^^^^^^^^^^^^^\n |\n = note: `#[warn(unused_imports)]` on by default\n\nwarning: unused import: `MiroirError`\n --> crates/miroir-core/src/anti_entropy.rs:7:20\n |\n7 | use crate::error::{MiroirError, Result};\n | ^^^^^^^^^^^\n\nwarning: unused import: `Group`\n --> crates/miroir-core/src/anti_entropy.rs:10:23\n |\n10 | use crate::topology::{Group, NodeId, Topology};\n | ^^^^^\n\nwarning: unused import: `std::collections::HashMap`\n --> crates/miroir-core/src/anti_entropy.rs:12:5\n |\n12 | use std::collections::HashMap;\n | ^^^^^^^^^^^^^^^^^^^^^^^^^\n\nwarning: unused imports: `AtomicUsize` and `Ordering`\n --> crates/miroir-core/src/cdc.rs:467:33\n |\n467 | use std::sync::atomic::{AtomicUsize, Ordering};\n | ^^^^^^^^^^^ ^^^^^^^^\n\nwarning: unused import: `crate::router::shard_for_key`\n --> crates/miroir-core/src/explainer.rs:7:5\n |\n7 | use crate::router::shard_for_key;\n | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n\nwarning: unused imports: `MiroirError` and `Result`\n --> crates/miroir-core/src/hedging.rs:6:20\n |\n6 | use crate::error::{MiroirError, Result};\n | ^^^^^^^^^^^ ^^^^^^\n\nwarning: unused imports: `Instant` and `sleep`\n --> crates/miroir-core/src/hedging.rs:14:19\n |\n14 | use tokio::time::{sleep, Instant};\n | ^^^^^ ^^^^^^^\n\nwarning: unused import: `std::future::Future`\n --> crates/miroir-core/src/multi_search.rs:10:5\n |\n10 | use std::future::Future;\n | ^^^^^^^^^^^^^^^^^^^\n\nwarning: unused import: `Instant`\n --> crates/miroir-core/src/rebalancer_worker/drift_reconciler.rs:16:27\n |\n16 | use std::time::{Duration, Instant};\n | ^^^^^^^\n\nwarning: unused import: `tokio::sync::RwLock`\n --> crates/miroir-core/src/rebalancer_worker/drift_reconciler.rs:17:5\n |\n17 | use tokio::sync::RwLock;\n | ^^^^^^^^^^^^^^^^^^^\n\nwarning: unused import: `std::sync::Arc`\n --> crates/miroir-core/src/rebalancer_worker/drift_reconciler.rs:394:9\n |\n394 | use std::sync::Arc;\n | ^^^^^^^^^^^^^^\n\nwarning: unused imports: `AdminSessionRow`, `CanaryRow`, `CdcCursorRow`, `NewAdminSession`, `NewCanary`, `NewCdcCursor`, `NewRolloverPolicy`, `NewSearchUiConfig`, `NewTenantMapping`, `RolloverPolicyRow`, `SearchUiConfigRow`, and `TenantMapRow`\n --> crates/miroir-core/src/rebalancer_worker/acceptance_tests.rs:11:68\n |\n11 | ...e, NewCanary, CanaryRow, NewCdcCursor, CdcCursorRow, NewTenantMapping, TenantMapRow, NewRolloverPolicy, RolloverPolicyRow, NewSearchUiConfig, SearchUiConfigRow, NewAdminSession, AdminSessionRow};\n | ^^^^^^^^^ ^^^^^^^^^ ^^^^^^^^^^^^ ^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^\n\nwarning: unused import: `tokio::sync::mpsc`\n --> crates/miroir-core/src/rebalancer_worker/acceptance_tests.rs:517:9\n |\n517 | use tokio::sync::mpsc;\n | ^^^^^^^^^^^^^^^^^\n\nwarning: unused import: `Ordering`\n --> crates/miroir-core/src/rebalancer_worker/acceptance_tests.rs:518:40\n |\n518 | use std::sync::atomic::{AtomicU32, Ordering};\n | ^^^^^^^^\n\nwarning: unused import: `tokio::sync::RwLock`\n --> crates/miroir-core/src/rebalancer_worker/settings_broadcast_acceptance_tests.rs:31:5\n |\n31 | use tokio::sync::RwLock;\n | ^^^^^^^^^^^^^^^^^^^\n\nwarning: unused import: `crate::config::MiroirConfig`\n --> crates/miroir-core/src/rebalancer_worker/mod.rs:1584:9\n |\n1584 | use crate::config::MiroirConfig;\n | ^^^^^^^^^^^^^^^^^^^^^^^^^^^\n\nwarning: unused import: `crate::migration::MigrationConfig`\n --> crates/miroir-core/src/rebalancer_worker/mod.rs:1585:9\n |\n1585 | use crate::migration::MigrationConfig;\n | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n\nwarning: unused imports: `MiroirError` and `Result`\n --> crates/miroir-core/src/replica_selection.rs:6:20\n |\n6 | use crate::error::{MiroirError, Result};\n | ^^^^^^^^^^^ ^^^^^^\n\nwarning: unused import: `Group`\n --> crates/miroir-core/src/replica_selection.rs:7:23\n |\n7 | use crate::topology::{Group, NodeId};\n | ^^^^^\n\nwarning: unused import: `Duration`\n --> crates/miroir-core/src/replica_selection.rs:12:17\n |\n12 | use std::time::{Duration, Instant};\n | ^^^^^^^^\n\nwarning: unused import: `std::fs`\n --> crates/miroir-core/src/task_store/sqlite.rs:1120:9\n |\n1120 | use std::fs;\n | ^^^^^^^\n\nwarning: unused import: `MiroirError`\n --> crates/miroir-core/src/ttl.rs:6:20\n |\n6 | use crate::error::{MiroirError, Result};\n | ^^^^^^^^^^^\n\nwarning: unused variable: `replica_groups`\n --> crates/miroir-core/src/anti_entropy.rs:160:13\n |\n160 | let replica_groups = topology.groups().count() as u32;\n | ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_replica_groups`\n |\n = note: `#[warn(unused_variables)]` on by default\n\nwarning: unused variable: `reference`\n --> crates/miroir-core/src/anti_entropy.rs:288:9","is_error":false}]},"parent_tool_use_id":null,"session_id":"d6289b3e-ec51-499d-8646-ea60fdfdad39","uuid":"b3be5b1a-13b8-4187-9bb4-64d9a48566f9","timestamp":"2026-05-23T06:39:13.442Z","tool_use_result":{"stdout":"warning: unused import: `AliasHistoryEntry`\n --> crates/miroir-core/src/alias/acceptance_tests.rs:150:46\n |\n150 | use crate::task_store::{SqliteTaskStore, AliasHistoryEntry};\n | ^^^^^^^^^^^^^^^^^\n |\n = note: `#[warn(unused_imports)]` on by default\n\nwarning: unused import: `MiroirError`\n --> crates/miroir-core/src/anti_entropy.rs:7:20\n |\n7 | use crate::error::{MiroirError, Result};\n | ^^^^^^^^^^^\n\nwarning: unused import: `Group`\n --> crates/miroir-core/src/anti_entropy.rs:10:23\n |\n10 | use crate::topology::{Group, NodeId, Topology};\n | ^^^^^\n\nwarning: unused import: `std::collections::HashMap`\n --> crates/miroir-core/src/anti_entropy.rs:12:5\n |\n12 | use std::collections::HashMap;\n | ^^^^^^^^^^^^^^^^^^^^^^^^^\n\nwarning: unused imports: `AtomicUsize` and `Ordering`\n --> crates/miroir-core/src/cdc.rs:467:33\n |\n467 | use std::sync::atomic::{AtomicUsize, Ordering};\n | ^^^^^^^^^^^ ^^^^^^^^\n\nwarning: unused import: `crate::router::shard_for_key`\n --> crates/miroir-core/src/explainer.rs:7:5\n |\n7 | use crate::router::shard_for_key;\n | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n\nwarning: unused imports: `MiroirError` and `Result`\n --> crates/miroir-core/src/hedging.rs:6:20\n |\n6 | use crate::error::{MiroirError, Result};\n | ^^^^^^^^^^^ ^^^^^^\n\nwarning: unused imports: `Instant` and `sleep`\n --> crates/miroir-core/src/hedging.rs:14:19\n |\n14 | use tokio::time::{sleep, Instant};\n | ^^^^^ ^^^^^^^\n\nwarning: unused import: `std::future::Future`\n --> crates/miroir-core/src/multi_search.rs:10:5\n |\n10 | use std::future::Future;\n | ^^^^^^^^^^^^^^^^^^^\n\nwarning: unused import: `Instant`\n --> crates/miroir-core/src/rebalancer_worker/drift_reconciler.rs:16:27\n |\n16 | use std::time::{Duration, Instant};\n | ^^^^^^^\n\nwarning: unused import: `tokio::sync::RwLock`\n --> crates/miroir-core/src/rebalancer_worker/drift_reconciler.rs:17:5\n |\n17 | use tokio::sync::RwLock;\n | ^^^^^^^^^^^^^^^^^^^\n\nwarning: unused import: `std::sync::Arc`\n --> crates/miroir-core/src/rebalancer_worker/drift_reconciler.rs:394:9\n |\n394 | use std::sync::Arc;\n | ^^^^^^^^^^^^^^\n\nwarning: unused imports: `AdminSessionRow`, `CanaryRow`, `CdcCursorRow`, `NewAdminSession`, `NewCanary`, `NewCdcCursor`, `NewRolloverPolicy`, `NewSearchUiConfig`, `NewTenantMapping`, `RolloverPolicyRow`, `SearchUiConfigRow`, and `TenantMapRow`\n --> crates/miroir-core/src/rebalancer_worker/acceptance_tests.rs:11:68\n |\n11 | ...e, NewCanary, CanaryRow, NewCdcCursor, CdcCursorRow, NewTenantMapping, TenantMapRow, NewRolloverPolicy, RolloverPolicyRow, NewSearchUiConfig, SearchUiConfigRow, NewAdminSession, AdminSessionRow};\n | ^^^^^^^^^ ^^^^^^^^^ ^^^^^^^^^^^^ ^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^\n\nwarning: unused import: `tokio::sync::mpsc`\n --> crates/miroir-core/src/rebalancer_worker/acceptance_tests.rs:517:9\n |\n517 | use tokio::sync::mpsc;\n | ^^^^^^^^^^^^^^^^^\n\nwarning: unused import: `Ordering`\n --> crates/miroir-core/src/rebalancer_worker/acceptance_tests.rs:518:40\n |\n518 | use std::sync::atomic::{AtomicU32, Ordering};\n | ^^^^^^^^\n\nwarning: unused import: `tokio::sync::RwLock`\n --> crates/miroir-core/src/rebalancer_worker/settings_broadcast_acceptance_tests.rs:31:5\n |\n31 | use tokio::sync::RwLock;\n | ^^^^^^^^^^^^^^^^^^^\n\nwarning: unused import: `crate::config::MiroirConfig`\n --> crates/miroir-core/src/rebalancer_worker/mod.rs:1584:9\n |\n1584 | use crate::config::MiroirConfig;\n | ^^^^^^^^^^^^^^^^^^^^^^^^^^^\n\nwarning: unused import: `crate::migration::MigrationConfig`\n --> crates/miroir-core/src/rebalancer_worker/mod.rs:1585:9\n |\n1585 | use crate::migration::MigrationConfig;\n | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n\nwarning: unused imports: `MiroirError` and `Result`\n --> crates/miroir-core/src/replica_selection.rs:6:20\n |\n6 | use crate::error::{MiroirError, Result};\n | ^^^^^^^^^^^ ^^^^^^\n\nwarning: unused import: `Group`\n --> crates/miroir-core/src/replica_selection.rs:7:23\n |\n7 | use crate::topology::{Group, NodeId};\n | ^^^^^\n\nwarning: unused import: `Duration`\n --> crates/miroir-core/src/replica_selection.rs:12:17\n |\n12 | use std::time::{Duration, Instant};\n | ^^^^^^^^\n\nwarning: unused import: `std::fs`\n --> 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Arc,\n | ^^^^^^^^\n\nwarning: structure field `indexUid` should have a snake case name\n --> crates/miroir-core/src/multi_search.rs:26:9\n |\n26 | pub indexUid: String,\n | ^^^^^^^^ help: convert the identifier to snake case: `index_uid`\n |\n = note: `#[warn(non_snake_case)]` on by default\n\nwarning: `miroir-core` (lib test) generated 61 warnings (run `cargo fix --lib -p miroir-core --tests` to apply 24 suggestions)\n Finished `test` profile [unoptimized + debuginfo] target(s) in 0.13s\n Running unittests src/lib.rs (target/debug/deps/miroir_core-51b32e4017909b72)\n\nrunning 1 test\ntest rebalancer_worker::acceptance_tests::p4_1_a1_advisory_lock_prevents_duplicate_migrations ... ok\n\ntest result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 391 filtered out; finished in 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