fix(proxy): hold fenced hard turns through cooldown - #1739
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📝 WalkthroughWalkthroughThe HTTP bridge now supports bounded cooldown waits for eligible operation-fenced hard turn-state requests. It refreshes durable ownership, enforces queue and request limits, preserves fail-closed cases, and adds unit and integration coverage. Kevin Lin was added to contributor listings. ChangesOperation-fenced cooldown recovery
Contributor attribution
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to The change holds eligible hard-turn requests during retry-circuit cooldown, but a durable-session renewal exception can escape as an unhandled error instead of returning the required controlled fail-closed response. This creates a concrete availability and error-handling risk on the cooldown path, so the PR is not merge-ready until that exception path is handled. Sequence Diagram(s)sequenceDiagram
participant SessionEventLoop
participant HTTPBridge
participant DurableOperationLedger
SessionEventLoop->>HTTPBridge: Check startup cooldown
HTTPBridge->>DurableOperationLedger: Validate owner and refresh lease
DurableOperationLedger-->>HTTPBridge: Return fencing status
HTTPBridge-->>SessionEventLoop: Wait, terminate, or continue
SessionEventLoop->>HTTPBridge: Submit after cooldown
Possibly related issues
Possibly related PRs
Suggested reviewers: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@app/modules/proxy/_service/http_bridge/streaming.py`:
- Around line 3724-3747: Update the durable lease renewal flow around
renew_live_session to catch Exception and fail closed with the same 502
ProxyResponseError and bridge_continuity_persistence_failed envelope already
used for None or ownership mismatches; mark the session for
closure/reconnect/drain consistently, and add a test covering a renewal
exception.
In `@openspec/changes/hold-operation-fenced-hard-turn-cooldown/design.md`:
- Around line 16-24: Add operation-ledger-enabled as an explicit eligibility
condition alongside the existing recovery, anchor, bridge, response, and budget
checks for turn-state-only hard requests; ensure eligibility fails closed when
the operation ledger is disabled.
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📒 Files selected for processing (10)
.all-contributorsrcREADME.mdapp/modules/proxy/_service/http_bridge/streaming.pyopenspec/changes/hold-operation-fenced-hard-turn-cooldown/.openspec.yamlopenspec/changes/hold-operation-fenced-hard-turn-cooldown/design.mdopenspec/changes/hold-operation-fenced-hard-turn-cooldown/proposal.mdopenspec/changes/hold-operation-fenced-hard-turn-cooldown/specs/responses-api-compat/spec.mdopenspec/changes/hold-operation-fenced-hard-turn-cooldown/tasks.mdtests/integration/test_proxy_api_extended.pytests/unit/test_proxy_http_bridge.py
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3 participants
Closes #1737.
Summary
fail_closedbehaviorWhy
Production telemetry showed two eventless upstream failures opening a 60-second retry circuit. Codex Desktop retried in milliseconds despite the HTTP/SSE retry hints, exhausting its retry budget against startup 503 responses. Turn-state-only hard continuity was rejected before the durable operation ledger could arbitrate bounded recovery.
The recommended deployment mode for this incident class is
server_anchored_replay_once; this PR does not make recovery default-on or add unbounded retries.Validation
5871 passed, 70 skipped— complete unit suite on the fork-main branch553 passed— HTTP bridge unit file129 passed— HTTP bridge integration suite5 passedty checkpassesgit diff --checkpassesThe full repository OpenSpec sweep contains unrelated pre-existing incomplete changes; this change validates independently under
--strict.Summary by CodeRabbit
Bug Fixes
Tests
Documentation