7be2a0e9ec
This commit adds comprehensive property-based tests and fuzzing coverage for critical router and parser invariants as specified in plan §8. **Property Tests (proptest) - router.rs:** - `prop_write_targets_count`: Verifies |write_targets| == RG × RF - `prop_write_targets_rf_per_group`: Verifies each group contributes exactly RF nodes - `prop_covering_set_covers_all_shards`: Verifies covering set includes all shards - `prop_reshuffle_bound_on_add`: Verifies reshuffle bounded by 4 × RF × ceil(S / Ng_new) - `prop_determinism`: Verifies same inputs produce same outputs - `prop_shard_for_key_uniformity`: Verifies uniform key distribution across shards **Fuzz Targets (cargo-fuzz):** - `config_parser.rs`: Feeds random UTF-8 to Config::from_yaml - `filter_parser.rs`: Feeds random strings to query planner filter grammar - `canonical_json.rs`: Roundtrips random JSON through canonicalizer **Bug Fixes:** - Fixed missing `mode_b_type` import in mode_b_coordinator.rs - Fixed missing `Arc` import in scatter.rs All property tests pass at 1024 cases per property. Fuzz targets are ready for integration with weekly CI fuzz runs via Argo Workflow. Closes: miroir-89x.6
50 lines
1.7 KiB
Rust
50 lines
1.7 KiB
Rust
#![no_main]
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use libfuzzer_sys::fuzz_target;
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use serde_json::Value;
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use std::collections::BTreeMap;
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use twox_hash::XxHash64;
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use std::hash::{Hash, Hasher};
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/// Canonicalize a JSON value by sorting object keys.
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fn canonicalize_json(value: &Value) -> String {
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match value {
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Value::Object(map) => {
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let sorted: BTreeMap<_, _> = map.iter().collect();
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serde_json::to_string(&sorted).unwrap_or_else(|_| "{}".to_string())
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}
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_ => serde_json::to_string(value).unwrap_or_else(|_| "null".to_string()),
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}
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}
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/// Compute hash of canonicalized JSON.
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fn hash_canonical(value: &Value) -> u64 {
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let canonical = canonicalize_json(value);
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let mut hasher = XxHash64::with_seed(0);
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hasher.write(canonical.as_bytes());
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hasher.finish()
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}
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fuzz_target!(|data: &[u8]| {
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// Try to parse as JSON
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let json1 = match serde_json::from_slice::<Value>(data) {
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Ok(v) => v,
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Err(_) => return, // Skip invalid JSON
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};
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// Canonicalize and hash - should never panic
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let hash1 = hash_canonical(&json1);
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// Round-trip through canonical string and verify
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let canonical = canonicalize_json(&json1);
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if let Ok(json2) = serde_json::from_str::<Value>(&canonical) {
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let hash2 = hash_canonical(&json2);
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// Hashes must be identical after roundtrip
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assert_eq!(hash1, hash2, "Canonical JSON roundtrip produced different hash");
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}
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// Verify that parsing the canonical string again produces the same hash
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if let Ok(json3) = serde_json::from_str::<Value>(&canonical) {
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let hash3 = hash_canonical(&json3);
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assert_eq!(hash1, hash3, "Second canonicalization produced different hash");
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}
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});
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