fix(lab): serialize CL-02 ledger mutations - #1709
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📝 WalkthroughWalkthroughThe ledger store now provides a shared mutation lock for replay and append operations. Observation persistence and sensitive-evidence purges use the lock for ledger and artifact changes. Tests cover lock waiting, stale-lock recovery, append persistence, and purge synchronization. ChangesLedger mutation locking
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: ⚪ Minimal · up to The PR serializes ledger mutations and improves stale-lock recovery; the remaining follow-up is limited to strengthening tests that verify lock files are cleaned up, with no actionable merge-blocking risk. Sequence Diagram(s)sequenceDiagram
participant ObservationPersistence
participant withLedgerMutation
participant LedgerFile
participant ArtifactStorage
participant SQLiteProjection
ObservationPersistence->>withLedgerMutation: create and persist observation event
withLedgerMutation->>LedgerFile: replay and append event
ObservationPersistence->>ArtifactStorage: publish canonical artifacts while lock is held
withLedgerMutation-->>ObservationPersistence: return persisted event and ledger path
ObservationPersistence->>SQLiteProjection: rebuild projection after lock release
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Actionable comments posted: 4
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Inline comments:
In `@src/lab/ledger/purge.ts`:
- Around line 196-213: Move the scratch and export purge blocks using
purgeBoundedDirectory before the withLedgerMutation callback acquires the ledger
lock, while preserving their completed entries and ordering before “ledger”.
Keep artifact deletion inside the locked callback because it depends on
deletionPlan from the replay snapshot, and leave the existing ledger mutation
behavior unchanged.
In `@src/lab/ledger/store.ts`:
- Around line 186-194: Remove the redundant caller-side validation in
appendLabEvent while preserving the pre-lock validated event needed by
appendLabEventIfAbsent for its eventId check. Keep defensive validation in
LedgerMutationContext.append within withLedgerMutation, including for purge
consumers, so each append is validated exactly once.
- Line 88: Make stale-lock recovery ownership-safe around isLockHolderAlive and
withLedgerMutation: never unconditionally unlink lockPath after observing a
stale PID, since another waiter may have replaced it. Use a platform-supported
ownership/compare-and-remove primitive; otherwise fail closed and require
explicit orphan-lock cleanup, preserving appendLabEventIfAbsent serialization.
Treat foreign-host PIDs as potentially alive unless ownership can be
established.
In `@tests/lab-ledger-mutation-lock.test.ts`:
- Around line 178-185: Update the cleanup in the test’s finally block to assert
that `${ledgerPath}.lock` does not exist after purge and replay assertions,
matching the existing lock-release check in Test 2. Remove the silent unlink
cleanup and its now-unused unlinkSync import.
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src/lab/ledger/purge.tssrc/lab/ledger/store.tstests/lab-ledger-mutation-lock.test.ts
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minimal, and validate.
Inline comments:
In `@src/lab/ledger/store.ts`:
- Around line 188-201: Update withLedgerMutation and the underlying
withLedgerLock handling so a thenable returned by the callback keeps the ledger
lock held until it settles, releasing it on fulfillment or rejection;
alternatively, explicitly reject async callbacks and invalidate the mutation
context after synchronous completion. Ensure mutation methods replay, append,
and appendIfAbsent cannot be used after the lock is released.
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src/lab/ledger/store.ts
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Inline comments:
In `@tests/lab-ledger-mutation-lock.test.ts`:
- Around line 181-208: Add a post-persistence assertion in the test covering
persistConformanceResult to verify existsSync(`${ledgerPath}.lock`) is false
after the call returns, alongside the existing replay assertion, while
preserving the current in-lock ArtifactStore.put check.
Apply the same fix in `@tests/lab-ledger-mutation-lock.test.ts` around lines 9 -
20: The purge test has the same lock-cleanup assertion gap and is covered by the
consolidated remediation.
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src/lab/fabric/observe.tssrc/lab/observe/from-conformance.tssrc/lab/observe/from-live.tstests/lab-ledger-mutation-lock.test.ts
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Summary
Follow-up to merged CL-02 evidence-ledger PR #1333 after re-validating its review findings against current
dev.The immediate post-merge findings from #1333 were already addressed by #1343 and the closure gate in #1348, so this PR does not duplicate those fixes. It fixes only concurrency and lock failures that still reproduce in the current implementation.
Fixes
appendLabEventwrites with the same ledger mutation lock used by read-modify-write operationsBun.sleepSync, avoiding a full CPU core burn during contentionWhy these are real
Before this change, normal evidence persistence called
appendLabEvent()without acquiringcompatibility.jsonl.lock, while purge replayed the ledger and later atomically renamed a rewritten file over it. An append that landed after purge's replay but before its rename was written to the old inode and then disappeared from the canonical ledger.Canonical producers also wrote content-addressed artifacts before the event append. A concurrent purge could calculate its deletion plan after the artifact write but before the event became visible, delete that digest, then let the producer append an event that references missing evidence.
The stale-lock path required a dead holder's lock to age for 60 seconds even though lock acquisition itself times out after 5 seconds, causing deterministic write failures after an abrupt process exit. Contention also used a synchronous busy loop for retry sleeps.
Regression coverage
Adds focused tests proving that:
appendLabEventIfAbsentimmediately recovers a lock left by an exited processScope
dev81ada7cd092d4be3b25f3013c996cd3262a2f99bSummary by CodeRabbit
Bug Fixes
Tests