test(race): interval-lock semantics + load scenarios for the atom lock layer - #1187
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| Layer / File(s) | Summary |
|---|---|
Interval-lock test utilities tests/typescript/race-conditions/utilities/interval-helpers.ts |
Added UTC interval and atom helpers, barriers, lock and booking attempts, Redis inspection, assertions, and JSON/Markdown reporting. |
Interval-lock semantic scenarios tests/typescript/race-conditions/scenarios/10-interval-lock-semantics/* |
Added scenarios for adjacent intervals, overlap contention, crossed acquisition order, TTL re-arming, rollback, release and reacquisition, and grid flooring. |
Concurrent booking load scenarios tests/typescript/race-conditions/scenarios/11-load-stress/* |
Added disjoint-load, overlap-heavy, and single-atom stress tests with exclusivity, timing, metrics, cleanup, and reporting assertions. |
Estimated code review effort: 4 (Complex) | ~45 minutes
Merge Risk: 🔵 Low · up to a3186
This change adds interval-lock semantics and load coverage without altering production behavior. The PR is mergeable with owner awareness that the crossed-acquisition test currently does not exercise both start orders as intended, leaving that specific concurrency scenario less thoroughly validated.
Possibly related PRs
- Practitionist/familiarise_web#848: Shares the race-condition test framework and concurrency utilities.
- Practitionist/familiarise_web#1091: Changes production interval-lock behavior tested by these scenarios.
- Practitionist/familiarise_web#1170: Introduces interval-granular locking covered by these tests.
Poem
I hop through slots from ten to noon,
And test each lock beneath the moon.
Adjacent atoms stand apart,
While overlaps guard the booking chart.
TTLs rearm, storms calm down—
Reports return with a passing crown.
🚥 Pre-merge checks | ✅ 4 | ❌ 1
❌ Failed checks (1 warning)
| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage | Docstring coverage is 52.38% which is insufficient. The required threshold is 80.00%. | Write docstrings for the functions missing them to satisfy the coverage threshold. |
✅ Passed checks (4 passed)
| Check name | Status | Explanation |
|---|---|---|
| Description Check | ✅ Passed | Check skipped - CodeRabbit’s high-level summary is enabled. |
| Title check | ✅ Passed | The title clearly identifies the added interval-lock semantics and load-stress race-condition scenarios. |
| Linked Issues check | ✅ Passed | Check skipped because no linked issues were found for this pull request. |
| Out of Scope Changes check | ✅ Passed | Check skipped because no linked issues were found for this pull request. |
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Actionable comments posted: 4
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Inline comments:
In
`@tests/typescript/race-conditions/scenarios/10-interval-lock-semantics/test-crossed-acquisition-order.ts`:
- Around line 70-78: Update the test setup around attemptIntervalLock so the two
lock attempts are created lazily and invoked in alternating order per round;
reversing an already-started Promise array is insufficient. Also make the
missing status-409 result explicit before deriving loserInterval, rather than
defaulting silently to late.
In
`@tests/typescript/race-conditions/scenarios/10-interval-lock-semantics/test-multi-atom-ttl-rearm.ts`:
- Around line 50-54: Update the interval-lock test constants around
MIN_REARMED_TTL_MS to derive the expected minimum from the effective TTL used by
lockSlotInterval, including INTERVAL_RETRY_CONFIG.driftFactor, rather than
hardcoding 28000. Export the effective interval TTL or a focused helper from the
interval-lock implementation and reuse it in the test while preserving the
existing assertion tolerance.
In `@tests/typescript/race-conditions/utilities/interval-helpers.ts`:
- Around line 138-152: Update createBarrier so each arriveAndWait call is
bounded by a timeout, rejecting or otherwise failing promptly when not all
participants arrive; preserve immediate gate resolution when the remaining count
reaches zero and ensure timeout failures provide a useful error instead of
hanging indefinitely.
- Around line 233-242: Update attemptIntervalBooking’s parameter type to omit
barrier and holdMs from IntervalAttempt while retaining the optional writeMs
field, since the function does not use those timing controls. Keep the existing
booking behavior unchanged and ensure its callers satisfy the narrowed contract.
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Fix all unresolved CodeRabbit comments on this PR:
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ℹ️ Review info
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Run ID: 8bcad8ef-7c66-4ff1-a229-45e6889029ea
📒 Files selected for processing (11)
tests/typescript/race-conditions/scenarios/10-interval-lock-semantics/test-adjacent-intervals-independent.tstests/typescript/race-conditions/scenarios/10-interval-lock-semantics/test-crossed-acquisition-order.tstests/typescript/race-conditions/scenarios/10-interval-lock-semantics/test-multi-atom-ttl-rearm.tstests/typescript/race-conditions/scenarios/10-interval-lock-semantics/test-overlapping-intervals-contend.tstests/typescript/race-conditions/scenarios/10-interval-lock-semantics/test-partial-acquisition-rollback.tstests/typescript/race-conditions/scenarios/10-interval-lock-semantics/test-release-then-reacquire.tstests/typescript/race-conditions/scenarios/10-interval-lock-semantics/test-unaligned-interval-floors-to-grid.tstests/typescript/race-conditions/scenarios/11-load-stress/test-disjoint-atom-parallel-load.tstests/typescript/race-conditions/scenarios/11-load-stress/test-overlap-heavy-mixed-load.tstests/typescript/race-conditions/scenarios/11-load-stress/test-single-atom-storm.tstests/typescript/race-conditions/utilities/interval-helpers.ts
…k layer Adds two mock-only scenario categories to the race-condition suite, covering the interval-atom slot lock the booking paths took on in #1169/#1170. Category 10 pins the semantics: overlapping intervals contend, an unaligned start floors onto the half-hour grid, adjacent intervals stay independent, crossed acquisition order cannot deadlock, a partial acquisition rolls every atom back, a released interval leaves no zombie keys, and a multi-atom acquisition re-arms all of its atoms to one shared deadline. Category 11 puts the same layer under load: a single-atom storm, disjoint slots in parallel to catch accidental serialisation, and an overlap-heavy mix where the winner count is not deterministic and the invariant (no two bookings share a 30-minute atom) is the assertion instead. Everything runs under USE_MOCK_REDIS with no server or database, and the master runner discovers both directories with no registration change. Part of #1169 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01SbUWhJASnqTFT9evn8YJVx
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… honest types The crossed-order round built both attempts in an array literal, so both promises were already running before the reverse — the alternation never happened and every round ran the same start order. The two sides are now deferred thunks invoked in the chosen order. A round with no refusal at all emits a named failed assertion instead of silently probing an arbitrary side. Worth recording: the winner does not alternate with the start order, because 10:30 is the late side's first atom and the early side's second. That is structure, not flakiness, and it is why the assertions count winners rather than naming one. Also bounds the barrier wait (a participant that never arrives used to hang the run until the job timeout, saving no report), narrows attemptIntervalBooking to the fields it actually reads, and clears three SonarCloud smells. Part of #1169 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01SbUWhJASnqTFT9evn8YJVx
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Residual from #1344: an N-parallel-allocations-against-one-slot regression test still does not exist; it belongs in this race-suite expansion. Verified against dev |
1 participant
Expands the race-condition suite with two new scenario categories that exercise the interval-atom slot lock introduced in #1169 and re-armed in #1170. Until now the suite locked one 30-minute atom per booking, so nothing covered what the interval keys were actually built for: overlap, grid flooring, acquisition ordering, rollback and the shared TTL deadline.
Category 10 —
10-interval-lock-semanticstest-overlapping-intervals-contendtest-unaligned-interval-floors-to-gridslotAtomStartsfloors the start to the half-hour grid, so 10:15–10:45 shares the 10:30 atom with 10:30–11:00.test-adjacent-intervals-independent[start, end), so a booking that ends at 10:30 never keys 10:30. Over-locking is as costly as under-locking.test-crossed-acquisition-ordertest-partial-acquisition-rollbacktest-release-then-reacquireunlockSlotIntervalclears every atom — a missed one would blank the slot until its TTL lapsed.test-multi-atom-ttl-rearmThe re-arm test is the one worth reading closely. It plants a short-lived lock on a middle atom so acquisition genuinely stalls, which is what produces the erosion in the first place. Without the re-arm the first and last atom deadlines would differ by the whole stall; the assertions measure that spread well away from any expiry boundary, so there are no sleeps near a deadline and nothing to go flaky.
Category 11 —
11-load-stresstest-single-atom-stormtest-disjoint-atom-parallel-loadtest-overlap-heavy-mixed-loadslotAtomStarts, plus zero errors (+2 assertions)Notes
USE_MOCK_REDIS=truewith no server, no database and no network, exactly like categories 01–06. Nothing here needs the seeded environment that makes 07 and 09 skip.discoverTests()readsscenarios/off disk, so both directories are picked up with no category registration. Verified with--category=10-interval-lock-semanticsand--category=11-load-stress.Math.random-seeded expectations.utilities/interval-helpers.ts; structural claims are expressed as result rows so they flow through the existinggenerateTestReportpass/fail contract, and report artifacts are identical in shape to the sibling categories.Verified locally: each file exits 0 on its own,
npx eslintis clean on all 11 new files, andtsc --noEmitscoped to them is clean.Part of #1169
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