fix(responses): scope compact handoff cache to authenticated admission principal - #4928
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Included review availability: Your plan provides up to 10 included reviews per hour; 4 remain after this review. 📝 WalkthroughWalkthroughChangesThe compact handoff route map now namespaces route keys by admitted principal and lane. Missing, loopback, and identity-less admissions do not participate in handoff routing. The handler and tests pass admission data through route storage and lookup. Compact handoff route namespacing
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant Client
participant handleResponsesCompact
participant compactHandoffRoute
participant FallbackModel
Client->>handleResponsesCompact: compact request with lane and admission
handleResponsesCompact->>compactHandoffRoute: lookup namespaced route
compactHandoffRoute-->>handleResponsesCompact: route for admitted principal
handleResponsesCompact->>FallbackModel: hand off compact request
FallbackModel-->>Client: compact response
Merge Risk: ⚪ Minimal · up to Compact handoff routes are scoped to authenticated principals and the covered non-owner cases do not reuse another client’s route. No merge-blocking risk remains. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 10.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 10 functions across 3 files. (2 skipped: 2 unsupported.)
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리뷰 · 우선순위 77 / 80이 PR은 #2723에서 들어온 compact handoff 캐시를 고칩니다. 지금 고치는 방법은 단순합니다. 새 테스트는 잘 나뉘어 있습니다. 기존 베이스는 지금 tip 라인 222 - 라인 compactHandoffRouteKey fallback - 경로 tests/responses/responses-compaction-routing.test.ts - 본문대로 hook timeout이 baseline에서도 나면 이 PR 회귀는 아닙니다. 다만 exact-head CI에서 같은 flaky가 다시 뜨면 이 변경과 섞여 보일 수 있으니, 실패 시 재현 조건만 한 줄 남겨 두면 좋습니다. 메인테이너의 판단이 필요한 지점
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In `@tests/responses/responses-compact-handoff-admission.test.ts`:
- Line 118: Update the compact handoff admission test around the owner fixture
to create two configured admissions sharing the same keyId but using different
contextPrincipalId values. Store the route under one principal, assert the other
principal cannot claim it, then verify the original principal retrieves it,
exercising the preferred contextPrincipalId branch in compactHandoffRouteKey.
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src/server/responses/compact.tstests/responses/responses-compact-handoff-admission.test.tstests/responses/responses-compaction-routing.test.ts
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…n principal The compactHandoffRoutes map is process-global but was keyed only by the caller-supplied lane header, so any two admitted clients sending the same lane header shared one fallback route. Namespace the lane by the admitted principal (contextPrincipalId when minted, configured key id or environment kind otherwise); loopback and missing admissions have no authenticated identity and are ineligible rather than trusted.
compactHandoffRouteKey substituted "configured:" plus the key id, or the constant "environment", when contextPrincipalIdOf returned nothing. Both substitutes reintroduce the collision the key exists to prevent: a key id survives rotation, so a replaced secret inherited the previous holder's route, and every identity-less environment admission shared one bucket. Production admission always mints a principal for configured and environment holders, so refusing the cache without one costs no real caller anything. The new test file was also missing from both test-layout registries, which tests/test-layout-tooling.test.ts asserts independently. Register it, and replace the different-key intruder with a same-key-id rotation so the case the old fallback collapsed is the one under test.
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Rebased this branch onto current
Verified after the rebase: no file in the baseline exceeds its cap in this tree. CI re-approved at the new head. |
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It is a budget overrun rather than a failure in this branch: the job ran 09:54:13 to 10:14:31, which is 20m18s against the 20-minute Re-running the failed job rather than widening the budget — the budget is what separates a slow shard from a wedged one. |
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Merging. A process-global map keyed on a caller-controlled header is the defect, and the fix names it precisely: two authenticated clients sending the same lane header would have shared one fallback route. Failing closed for a loopback or identity-less admission is the right call rather than the cautious-looking one. Substituting The follow-up commit that fails closed when an admission mints no principal at all belongs here too: an admission object that exists but carries no identity is the same hole one step in. |
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Summary
The compact handoff fallback added for #2723 keeps a process-global map (
compactHandoffRoutes) of the last model that successfully compacted a thread, so a quota-blocked previous-model compact can retry a working route. The map was keyed only bysessionLaneIdFromRequest(req.headers)— a caller-supplied header. Any two admitted clients sending the same lane header therefore shared one fallback route: one client could redirect another client's quota-blocked compact onto a model it never used.compactHandoffRouteKey(req, admission)namespaces the lane by the admitted principal: the mintedcontextPrincipalIdwhen present, falling back toconfigured:<keyId>/environmentfor admissions constructed without one.rememberCompactHandoffRoute/forgetCompactHandoffRoute/compactHandoffRoutetake the admission thathandleResponsesCompactalready receives; the production call site inserve-options.tsalready forwards it, so no wiring outside this module was needed.Regression coverage lives in a new file,
tests/responses/responses-compact-handoff-admission.test.ts: the existing routing spec sits exactly at its file-size ratchet cap (2776 lines), so only the minimal admission wiring was added there (line-neutral) and the new principal-isolation scenarios — different configured key, environment, loopback, and missing admission all failing to claim the owner's route, while the owner still hands off — went into the new file.Verification
Exact head:
fdfbf25257f1e289321724613a6ead792f51b545(tree38a593cdd7f970e869b7f81777d1793a64132b24), based on deve80e571f63a52a3dbba0edeeb576060debf14190.bun x tsc --noEmit— clean.bun run structure:check— passed.bun run privacy:scan— passed.bun scripts/file-size-ratchet.ts— passed.bun run skill:surface:check— passed.bun test tests/responses/responses-compact-handoff-admission.test.ts— 1 test / 16 assertions, pass.bun test tests/responses/responses-compaction-routing.test.ts— 124/125 pass; the single failure is an unnamedbeforeEach/afterEachhook timeout that reproduces identically on the unmodified dev baseline under the same concurrent load (test-runner user-lock contention), so it is environmental rather than a regression from this change.Remaining gates
macos controllane is subject to the known 30-minute dispatch cap tracked in [Bug]: macOS control is cancelled near its 30-minute limit in full dispatch CI #4905.Review readiness checklist
Review readiness checklist
This PR stays in draft until every box below is ticked. Tick all four boxes once the requirements are met:
All CI tests are green on my local testing. Local gates passed on this head (tsc plus focused suites); the full routing file re-ran 124 pass with one unnamed afterEach hook timeout (15s, infrastructure - no named assertion failed). Fork CI dispatched.
I pushed my PR to the latest dev commit. The branch carries dev
4c0124acb.I resolved all correct Codex and CodeRabbit findings. No unresolved review threads on this head.
My PR is ready for review.
Summary by CodeRabbit
Bug Fixes
Tests