feat(diagnostics): hint for 3rd-party relay SSE truncation (#180)#181
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- Residual risk/testing gap: automated tests were not run in this environment (
pnpmnot found), so behavioral validation depends on CI. docs/VISION.mdanddocs/PRINCIPLES.md: Not found in repo/docs.
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Some gateways (older sub2api / claude2api / anyrouter builds) mishandle OpenAI Responses API SSE events and treat `response.output_text.delta` / `response.completed` as `[DONE]`, cutting the stream short with no HTTP status — the error surfaces as a transport-level "terminated" / "premature close" / ECONNRESET. diagnoseGenerateFailure() now recognises this pattern and returns a `relayStreamingBug` hypothesis with actionable fix copy (upgrade the relay, switch wire to openai-chat, or use api.openai.com directly). Detection signal (b): wire=openai-responses AND baseUrl host is not *.openai.com AND no HTTP status attached AND the message matches a truncated-stream shape. HTTP-status errors still route to the existing gatewayIncompatible / serverError / keyInvalid paths. Refs #167. Stacked on #165 (introduces diagnoseGenerateFailure). Signed-off-by: hqhq1025 <1506751656@qq.com>
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docs/VISION.mdanddocs/PRINCIPLES.md: Not found in repo/docs.- Residual risk/testing gap: heuristic matching for truncated streams is covered by unit tests in
packages/shared/src/diagnostics.test.ts, but integration behavior remains dependent on CI/runtime paths.
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Summary
Fix #180 (implementation of #167): give users an actionable diagnostic when a third-party relay (older sub2api / claude2api / anyrouter builds) mishandles OpenAI Responses API SSE events and cuts the stream short with no HTTP status.
What changed
packages/shared/src/diagnostics.ts— newrelayStreamingBughypothesis indiagnoseGenerateFailure(). Triggers when:wire === 'openai-responses'baseUrlhost is not*.openai.comstream ended,premature close,terminated,ECONNRESET,abortedpackages/i18n/src/locales/en.json+zh-CN.json—diagnostics.cause.relayStreamingBug+diagnostics.fix.relayStreamingBug.packages/shared/src/diagnostics.test.ts— 6 new tests covering positive + negative cases:api.openai.com+ "terminated" → does NOT trigger (official endpoint isn't the culprit)serverError)Detection signal used: (b) from the task spec — pattern-matching on baseUrl + wire + message, since the existing error path (
packages/providers/src/codex/client.ts,retry.ts) does not yet attach a "stream closed without response.completed" context field.Stacked on #165
This PR builds on the
diagnoseGenerateFailure()function introduced in #165 (branchworktree-agent-a75d65c7). Merge #165 first, then this PR. Rebasing onto main after #165 lands will be a no-op.Four-principle check
serverError/unknownwhen signals don't matchTest plan
pnpm --filter @open-codesign/shared test— 174 passed (8 files)pnpm typecheck— 10 packages greenpnpm lint— biome clean (360 files)response.*SSE events, confirm the diagnostic panel renders the new cause + fix stringsRefs #167, closes #180.