test(oauth): prove the unobservable quorum staleness window is harmless - #3533
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Explicit invalidation covers the roster mutations this module can see, but not one it cannot: a 401 elsewhere flagging an account needsReauth drops the real quorum to one while the cached true survives the TTL. The window is left unplumbed on purpose, so the reason is now proven rather than asserted: a stale true only lets the caller ASK, and pickAlternateAnthropicAccount re-reads the roster, skips the flagged account and returns null. If that ever stops holding, the comment above the cache becomes a lie and this test fails.
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📝 WalkthroughWalkthroughThe change documents quorum-cache staleness and adds a test showing that rotation re-reads the roster and does not dispatch on an account flagged for reauthentication. ChangesAnthropic quorum cache
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🔵 Low · up to The new OAuth routing documentation understates the duration that stale negative quorum state can suppress failover, potentially obscuring repeated 429 responses for up to the remaining cache TTL. Correct the documented behavior and add coverage if it is intentional. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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리뷰 · 우선순위 73 / 80이 PR은 프로덕트 동작을 바꾸지 않는다. Anthropic 쿼럼 캐시에 이미 있던 “못 보는 구멍”을 글로 적고, 그 구멍이 실제로 위험한지 테스트로 증명한다. 지금 문제의 핵심은 짧다. 왜 그래도 괜찮은가. 캐시된 새 테스트는 그 주장을 코드로 고정한다. 계정 두 개를 심고 quorum을 라인 (anthropic-routing.ts QUORUM_CACHE_TTL 주석 블록) - 설명은 정확하고 HEAD의 게이트( 라인 (새 테스트: stale quorum cannot dispatch…) - stale
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| * through the store. A stale `true` only lets the caller ASK for an alternate; | ||
| * `pickAlternateAnthropicAccount` re-reads the roster through `getEligibleAnthropicAccounts`, | ||
| * skips the reauth-flagged account and returns `null`, so the 429 surfaces exactly as it would | ||
| * have. A stale `false` costs one un-rotated 429 and self-corrects on the next read. Neither |
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When a second login arrives while false is cached, every request initialized before the two-second TTL expires receives that cached value at src/server/responses/core.ts:3486, leaves anthropicPoolAccountId null, and therefore skips the Anthropic rotation arms if it later receives a 429. Under a burst this can strand many requests, not just the single unrotated 429 claimed here, and the added test covers only stale true. Either invalidate the cache when an Anthropic credential is added or document and test the actual multi-request consequence rather than using this assertion to justify omitting the store hook.
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Inline comments:
In `@src/oauth/anthropic-routing.ts`:
- Around line 262-263: Update the documentation near rotateAnthropicAccountOn429
to state that a stale cached false suppresses rotation until quorumCache
expires, potentially for the remaining two-second TTL, rather than implying it
self-corrects on the next read. Add a regression test covering two 429-triggered
rotations before cache expiry if this suppression behavior is intentional.
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| * have. A stale `false` costs one un-rotated 429 and self-corrects on the next read. Neither | ||
| * can dispatch on an unusable credential, which is the only outcome worth adding a store hook |
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📐 Maintainability & Code Quality | 🟡 Minor | ⚡ Quick win
Correct the stale-false consequence.
A stale false can cause more than one un-rotated 429. rotateAnthropicAccountOn429 returns at its quorum gate while the cached false remains valid. It does not clear quorumCache on that path. State that rotation remains suppressed until the cache expires, which can be up to the remaining two-second TTL. Add a regression case with two 429 rotations before expiry if this behavior is intentional.
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In `@src/oauth/anthropic-routing.ts` around lines 262 - 263, Update the
documentation near rotateAnthropicAccountOn429 to state that a stale cached
false suppresses rotation until quorumCache expires, potentially for the
remaining two-second TTL, rather than implying it self-corrects on the next
read. Add a regression test covering two 429-triggered rotations before cache
expiry if this suppression behavior is intentional.
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review. Visit https://docs.coderabbit.ai/cli.
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Approved on exact head 250af1fdc. The change documents the one intentionally unobserved quorum-cache mutation and pins the actual fail-closed consequence: a stale true may admit the retry attempt, but pickAlternateAnthropicAccount re-reads the eligible roster and refuses the needsReauth account, so no unusable credential is dispatched.
Independent isolated-home validation passed 40 focused quorum/generic/always-on failover tests, typecheck, and privacy scan. Exact-head CI is fully green across all four Linux shards, both macOS shards, keyring/npm smoke jobs, deterministic gates, and CodeRabbit. No runtime behavior is changed by this PR.
…ed spy, not atime Three cases in anthropic-quorum-cache failed on windows 2/4 as soon as #3533 landed: the observer pinned auth.json's atime into the past and asserted that readFileSync moved it. Measured on windows-latest (run 33929916059): fsutil DisableLastAccess = 3, and readFileSync left atimeMs unchanged. So the three 'invalidates immediately' cases could never see the read they assert on, and the 'shares one read' case passed vacuously on the same platform. The observer now counts pass-through spyOn(fs, 'readFileSync') calls against this home's auth.json - the same instrument claude-system-env-auto.test.ts already uses, filtered so refresh-intent files, lock snapshots and peekAuthStore never enter the count. All four call sites and every assertion keep their shape. No src/ change. Ablation: disabling the cache-hit return at anthropic-routing.ts:291 turns the burst case red on the spy (Expected false, Received true), which atime could not do on Windows. A comment records that the burst case proves zero reads during hits, not one read per fill - a fill is up to three reads through getAccountCredential, and tightening to ===1 would be wrong.
…ime (Windows stack 4/4) (#3555) * docs(devlog): record the first all-green Windows CI run (33926041666) * docs(devlog): dev drift under the stack - the quorum-cache atime observer on Windows (060) * docs(devlog): plan the quorum-cache read observer fix (070), atime measured on windows-latest * docs(devlog): record the stack's confirmation status and PR numbers in 000_plan * test(routing): observe the quorum-cache store read with a path-filtered spy, not atime Three cases in anthropic-quorum-cache failed on windows 2/4 as soon as #3533 landed: the observer pinned auth.json's atime into the past and asserted that readFileSync moved it. Measured on windows-latest (run 33929916059): fsutil DisableLastAccess = 3, and readFileSync left atimeMs unchanged. So the three 'invalidates immediately' cases could never see the read they assert on, and the 'shares one read' case passed vacuously on the same platform. The observer now counts pass-through spyOn(fs, 'readFileSync') calls against this home's auth.json - the same instrument claude-system-env-auto.test.ts already uses, filtered so refresh-intent files, lock snapshots and peekAuthStore never enter the count. All four call sites and every assertion keep their shape. No src/ change. Ablation: disabling the cache-hit return at anthropic-routing.ts:291 turns the burst case red on the spy (Expected false, Received true), which atime could not do on Windows. A comment records that the burst case proves zero reads during hits, not one read per fill - a fill is up to three reads through getAccountCredential, and tightening to ===1 would be wrong. --------- Co-authored-by: jun <jun@lidge.dev>
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Summary
The quorum cache has one roster mutation it cannot observe, and the comment above it did not say so.
Explicit invalidation covers what this module can see — rotation, pool-state reset, affinity clear on account removal, manual selection. It cannot see a 401 elsewhere flagging an account
needsReauth, which drops the real quorum to one while the cachedtruesurvives up to 2 s.I left that window unplumbed rather than threading a hook through the credential store, so the reason is now written down and, more importantly, proven:
trueonly lets the caller ask.pickAlternateAnthropicAccountre-reads the roster throughgetEligibleAnthropicAccounts, skips the flagged account, and returnsnull— the 429 surfaces exactly as it would have.falsecosts one un-rotated 429 and self-corrects on the next read.Neither can dispatch on an unusable credential, which is the only outcome that would justify a store hook. The new test leaves the cache deliberately stale and asserts the rotator still refuses; if that ever stops holding, the comment becomes a lie and the test fails.
Verification
bun run typecheck— clean.bun testacross six focused files — 60 pass, 0 fail.Also re-verified the whole unit against current
devrather than memory: the Anthropic gate is the presence-or-flag form atanthropic-routing.ts:647,isGenericOAuthFailoverEnabledis presence-only with no boolean short-circuit, and the rotator counts are 4 generic / 3 Anthropic / 2 key-pool as pinned by the contract test.Checklist
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Tests