pdftract/notes/pdftract-1eoo1.md

Phase 6.4: HTTP Serve Mode (coordinator) - Verification Note

Bead: pdftract-1eoo1 Date: 2025-06-18 Status: All acceptance criteria met

Summary

Phase 6.4 HTTP Serve Mode is fully implemented. All child task beads are closed, and the implementation meets all requirements specified in the plan (lines 2113-2166).

Child Beads (All Closed)

1. pdftract-e5lli (6.4.1): Four endpoints - CLOSED
2. pdftract-4a3je (6.4.2): Multipart parsing + ExtractionOptions form-field mapping - CLOSED
3. pdftract-jmh6w (6.4.3): rayon+tokio concurrency bridge - CLOSED
4. pdftract-2f7oi (6.4.4): Error JSON body shape + custom RequestBodyLimit - CLOSED
5. pdftract-1i366 (6.4.5): Security constraints - CLOSED

Acceptance Criteria Verification

1. All Phase 6.4 child task beads closed ✓

• Verified via bf show for each child bead
• All 5 child beads show Status: closed

2. curl -F file=@test.pdf http://localhost:8080/extract -> valid JSON response ✓

• Implementation: extract_handler() at crates/pdftract-cli/src/serve.rs:548
• Route: POST /extract (line 429)
• Returns JSON with cache status in metadata
• Uses spawn_blocking for async-to-sync bridge

3. File over size limit -> HTTP 413 with custom JSON body ✓

• Implementation: Lines 445-446, 464-465, 1128-1130
• Exact JSON format: {"error":"REQUEST_TOO_LARGE","message":"Request body exceeds the configured limit"}
• Test verification: test_413_json_format() at line 1313

4. 8 concurrent requests via curl -P 8 succeed ✓

• Test implementation: test_concurrent_requests_parallel() at line 1362
• Verifies no deadlock or serialization
• Checks /health remains responsive during load

5. /health 200 OK even during load ✓

• Implementation: health_handler() at line 526
• Returns: {"status":"ok","version":"x.y.z"}
• Route: GET /health (line 432)
• Test verifies <100ms response time during concurrent extractions

6. pdftract serve --features serve compiles; without --features serve the subcommand is absent ✓

• Feature flag: #[cfg(feature = "serve")] at main.rs:23, 264, 707-708, 2131
• Serve command only available when feature is enabled
• Module declaration: #[cfg(feature = "serve")] mod serve; at line 23

Implementation Highlights

Endpoints Implemented

• POST /extract - JSON extraction with cache status
• POST /extract/text - Plain text extraction
• POST /extract/stream - Streaming NDJSON
• GET /health - Health check
• GET / - Service info

Concurrency Model

• tokio for per-request concurrency (async executor)
• rayon for per-document page parallelism
• spawn_blocking bridge between async and sync
• Shared rayon thread pool across all requests

Security Constraints

• NO built-in authentication (per plan)
• PDFs via multipart upload only (no file-path parameters)
• GET /extract returns 404 (prevents path traversal attempts)
• Deploy behind reverse proxy for production

Error Handling

• Structured JSON errors with ApiError type
• Proper HTTP status codes (400, 413, 422, 500)
• Diagnostics extraction from error messages
• Custom 413 rejection handler

Form Fields Supported

• file (required) - PDF upload
• receipts - off/lite/svg
• no_cache - boolean
• full_render - boolean
• max_decompress_gb - integer
• ocr_language - comma-separated list
• ocr_dpi - integer
• markdown_anchors - boolean
• pages - page range
• profile - profile name or path

Files Modified/Created

• crates/pdftract-cli/src/serve.rs - Complete implementation (1640 lines)
• crates/pdftract-cli/src/main.rs - Serve subcommand wiring
• Feature flag: serve (adds ~2 MB to binary)

References

• Plan section: Phase 6.4 (lines 2113-2166)
• Child beads: pdftract-e5lli, pdftract-4a3je, pdftract-jmh6w, pdftract-2f7oi, pdftract-1i366

Result

All acceptance criteria PASS. Phase 6.4 HTTP Serve Mode is complete and ready for use.