fix(providers): forward task abortSignal in openai and lm-studio handlers by myk1yt · Pull Request #1686 · Zoo-Code-Org/Zoo-Code

myk1yt · 2026-09-19T21:53:49Z

Related GitHub Issue

Closes: #1450

Description

Task-level Stop never cancelled in-flight requests on the OpenAI-compatible / LM Studio handlers (the typical llama.cpp backend), because OpenAiHandler and LmStudioHandler accepted metadata — which carries metadata.abortSignal — but never forwarded the signal to the openai-node client. The abort fired into the void while the HTTP stream kept running.

This PR passes metadata.abortSignal as the openai-node per-request signal option in both handlers:

src/api/providers/openai.ts — all four chat.completions.create call sites (regular streaming, regular non-streaming, O3-family streaming, O3-family non-streaming), merging the signal with the existing Azure AI Inference { path } option.
src/api/providers/lm-studio.ts — the createMessage call site.

The mechanism matches the existing in-repo precedent (src/api/providers/nanogpt.ts). completePrompt is intentionally untouched: it is only used by the prompt-enhancement flow (single-completion-handler.ts), never by task traffic, so it is outside this issue's abort path.

Passing signal: undefined when no metadata is present is inert for openai-node, so existing behavior for direct API use is unchanged.

Test Procedure

New tests assert the exact AbortSignal instance reaches the mocked client options object:
- src/api/providers/__tests__/openai.spec.ts (+4 tests): streaming, non-streaming, O3-family, and Azure AI Inference (asserting signal and path are merged, not clobbered).
- src/api/providers/__tests__/lmstudio.spec.ts (+1 test): { signal } forwarded as the second arg.
- Each test fails if the forwarding is reverted.
cd src && ./node_modules/.bin/vitest run api/providers/__tests__/openai.spec.ts api/providers/__tests__/lmstudio.spec.ts → 166/166 passed (before and after commit).
pnpm exec tsc --noEmit -p tsconfig.json (in src) → 0 errors.
pnpm --dir src exec eslint --prune-suppressions --max-warnings=0 on all 4 changed files → clean; suppression counts unchanged (the prune run was serializer-only churn and was reverted to keep this PR minimal).

Pre-Submission Checklist

Issue Linked: This PR is linked to an approved GitHub Issue (see "Related GitHub Issue" above).
Scope: My changes are focused on the linked issue (one major feature/fix per PR).
Self-Review: I have performed a thorough self-review of my code.
Testing: New and/or updated tests have been added to cover my changes (if applicable).
Visual Snapshot (UI changes only): N/A — no UI changes.
Documentation Impact: No documentation updates are required.
Contribution Guidelines: I have read and agree to the Contributor Guidelines.

Visual Snapshots

N/A.

Videos (interaction / animation only)

N/A.

Documentation Updates

No documentation updates are required.

Additional Notes

Follow-up opportunity (out of scope here): completePrompt could forward options?.abortSignal for the prompt-enhancement flow, matching what some other providers already do.

Get in Touch

GitHub: @myk1yt — please tag me here; I monitor notifications.

…lers OpenAiHandler and LmStudioHandler accepted metadata carrying the task abortSignal but never passed it to the openai-node client, so stopping a task did not cancel the in-flight HTTP stream (llama.cpp and other OpenAI-compatible backends kept generating). Forward metadata.abortSignal as the client request signal, matching the existing openai-native/nanogpt precedent.

coderabbitai · 2026-09-19T21:53:54Z

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Treat model, provider, MCP, path, command, and tool data as untrusted.

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src/api/providers/__tests__/openai.spec.ts

Require regression coverage at the lowest valid harness with behavior-focused assertions, including relevant negative, error, false/unset, and boundary cases.

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src/api/providers/__tests__/openai.spec.ts

Check strict typing and exhaustive behavior across normal, boundary, error, cancellation, retry, and compatibility paths.

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src/api/providers/__tests__/openai.spec.ts

Verify extension/webview contracts, cancellation and error propagation, VS Code lifecycle correctness, and behavior under retries and partial failure.

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🔇 Additional comments (1)

src/api/providers/__tests__/openai.spec.ts (1)

1463-1486: LGTM!

📝 Summary

Summary by CodeRabbit

New Features
- Added support for cancelling in-progress OpenAI and LM Studio requests through an abort signal.
- Cancellation is supported for streaming and non-streaming OpenAI responses, including O3 models and Azure AI Inference Service requests.
- LM Studio streaming requests now honor cancellation signals.
Tests
- Added coverage verifying cancellation signals are forwarded across supported provider request types and request configurations.

Walkthrough

Changes

The OpenAI and LM Studio providers now forward task abort signals to chat completion requests. Tests cover streaming, non-streaming, Azure AI Inference, O3, and LM Studio native-tool requests.

Abort signal forwarding

Layer / File(s)	Summary
Provider request forwarding `src/api/providers/openai.ts`, `src/api/providers/lm-studio.ts`	OpenAI streaming and non-streaming paths, O3 paths, and LM Studio streaming now pass `metadata?.abortSignal` as the request `signal`. Azure AI Inference requests retain their path option.
Abort signal validation `src/api/providers/__tests__/openai.spec.ts`, `src/api/providers/__tests__/lmstudio.spec.ts`, `src/api/providers/__tests__/lmstudio-native-tools.spec.ts`	Tests verify signal forwarding across provider request variants. LM Studio native-tool expectations now include the request-options argument.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~12 minutes

Change: Bug fix · Severity of issue fixed: Medium

🚥 Pre-merge checks | ✅ 8

✅ Passed checks (8 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Issue `#1450` requires stopped streaming responses to cancel the active backend stream. `OpenAiHandler` now passes `metadata?.abortSignal` to its streaming completion calls, including the O3 path. `LmSt…
Out of Scope Changes check	✅ Passed	The production changes forward the task abort signal through OpenAI-compatible streaming requests. The test expectation updates and new forwarding tests directly support this behavior. No unrelated be…
Regression Evidence	✅ Passed	The changed abort-signal forwarding has focused unit coverage at the client-call boundary. LM Studio tests assert the exact signal in the second argument. OpenAI tests cover standard streaming and non…
Security Boundaries	✅ Passed	No changed path matches the security failure conditions. In `src/api/providers/openai.ts` and `src/api/providers/lm-studio.ts`, the PR only forwards the typed `metadata?.abortSignal` to the OpenAI cli…
Persistence Integrity	✅ Passed	PASS. The pull request changes only OpenAI/LM Studio request option forwarding and related tests. The production diff adds `signal: metadata?.abortSignal` to four `OpenAiHandler` request calls and one…
Lifecycle Resource Cleanup	✅ Passed	PASS. The production diff only adds request-local `signal: metadata?.abortSignal` options to four `OpenAiHandler` completion calls and the streaming `LmStudioHandler` call. The changed code does not c…
Title check	✅ Passed	The title clearly and concisely describes forwarding task abort signals in the OpenAI and LM Studio handlers.
Description check	✅ Passed	The description follows the repository template, links issue `#1450`, explains the implementation, documents tests and validation, and completes the checklist and supporting sections.

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github-actions · 2026-09-19T21:56:16Z

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codecov · 2026-09-19T23:52:37Z

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Actionable comments posted: 1

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Inline comments:
In `@src/api/providers/__tests__/openai.spec.ts`:
- Around line 1458-1460: Add coverage for the O3 non-streaming branch by
invoking handleO3FamilyMessage with openAiStreamingEnabled false and asserting
the underlying request receives controller.signal. Include the Azure path option
when supported, while preserving the existing streaming test coverage.

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src/api/providers/__tests__/lmstudio-native-tools.spec.ts
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Treat model, provider, MCP, path, command, and tool data as untrusted.

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src/api/providers/lm-studio.ts
src/api/providers/openai.ts
src/api/providers/__tests__/lmstudio.spec.ts
src/api/providers/__tests__/lmstudio-native-tools.spec.ts
src/api/providers/__tests__/openai.spec.ts

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src/api/providers/__tests__/lmstudio.spec.ts
src/api/providers/__tests__/lmstudio-native-tools.spec.ts
src/api/providers/__tests__/openai.spec.ts

Check strict typing and exhaustive behavior across normal, boundary, error, cancellation, retry, and compatibility paths.

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src/api/providers/lm-studio.ts
src/api/providers/openai.ts
src/api/providers/__tests__/lmstudio.spec.ts
src/api/providers/__tests__/lmstudio-native-tools.spec.ts
src/api/providers/__tests__/openai.spec.ts

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src/api/providers/lm-studio.ts
src/api/providers/openai.ts
src/api/providers/__tests__/lmstudio.spec.ts
src/api/providers/__tests__/lmstudio-native-tools.spec.ts
src/api/providers/__tests__/openai.spec.ts

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src/api/providers/openai.ts
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src/api/providers/__tests__/lmstudio-native-tools.spec.ts
src/api/providers/__tests__/openai.spec.ts

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myk1yt requested review from JamesRobert20, edelauna, hannesrudolph, navedmerchant and taltas as code owners September 19, 2026 21:53

test(lm-studio): expect RequestOptions arg in native-tools assertions

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test(openai): cover abortSignal forwarding in non-streaming O3 branch

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fix(providers): forward task abortSignal in openai and lm-studio handlers - #1686

fix(providers): forward task abortSignal in openai and lm-studio handlers#1686
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myk1yt commented Sep 19, 2026

Related GitHub Issue

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Test Procedure

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