test(graphrag): add Drain miner fuzz target (Scorecard Fuzzing)#115
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Add FuzzDrainMatch, a Go native fuzz test over the Drain log-template miner's Match() — the ingestion hot path every untrusted log body flows through (LogsServer.Export -> LogCallback -> Drain.Match). It asserts Match never panics on malformed input and holds two invariants: empty or whitespace-only tokenization yields a nil template, and any non-nil result is well-formed (non-empty tokens, ID == templateID(tokens)). It also checks Preprocess+tokenize determinism. Seeds cover empty, whitespace, IPs/UUIDs/timestamps/emails/hex pointers, NUL + high-byte binary, multibyte UTF-8, and an over-depth token run. Satisfies OpenSSF Scorecard's Fuzzing check (detects a native Go fuzz function). Verified: go build/vet/test green (101 tests), and go test -fuzz=FuzzDrainMatch -fuzztime=10s found no crashers. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01LDQVJrixs2nJoea67a8pEG
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What
Adds
FuzzDrainMatch, a Go native fuzz test over the Drain log-template miner'sMatch()(internal/graphrag/drain_fuzz_test.go).Match()is the ingestion hot path every untrusted log body flows through (LogsServer.Export → LogCallback → Drain.Match), so it's the right surface to fuzz. The test assertsMatchnever panics on malformed input and holds two invariants:niltemplate;ID == templateID(tokens)).It also checks that
Preprocess+tokenizeare deterministic. Seeds cover empty, whitespace, IPs/UUIDs/timestamps/emails/hex pointers, NUL + high-byte binary, multibyte UTF-8, and an over-depth token run.Why
OpenSSF Scorecard's Fuzzing check currently scores 0 — it detects no native Go fuzz function. One
FuzzXxx(*testing.F)flips it. This is the highest-value parser on the untrusted-input path that wasn't already fuzzed.Verification
go build ./...— successgo vet ./internal/graphrag/— cleango test ./internal/graphrag/— 101 pass (fuzz seed corpus runs as unit tests)go test -fuzz=FuzzDrainMatch -fuzztime=10s— no crashers🤖 Generated with Claude Code