feat(api): abort signal support for requesty (createMessage + kill tests)

[easonLiangWorldedtech]

Adds abort-signal support to the Requesty provider's createMessage (round 1 of the abort-signal series).

Supersedes #1301 (split B, part 2 of 2) ??stacked. This PR is stacked on part 1 (#1537, shared helper + completePrompt); its incremental diff is +549/??3 = 612 a+d across 2 files, measured against the part-1 head d298d4a6f. The GitHub diff against main will show the combined 1139 a+d (both parts) ??that number reflects the stack, not this PR's own scope. The original #1301 combined unit measured 1139 a+d against the 1000 hard line-budget cap, which is why the Requesty portion lands as these two stacked PRs.

createMessage (new bridging)

Bridges the caller's metadata.abortSignal into a per-request AbortController (Bedrock pattern):

• The request-local controller is captured by closure (not a mutable field), so concurrent requests do not interfere.
• Pre-aborted guard: if the signal is already aborted, the stream rejects with AbortError immediately without calling the API.
• The external listener is stored in a named const and removed in finally, so listeners never outlive the request.
• The SDK request is driven by the controller's signal, and abort-driven stream failures are normalized to AbortError.
• Buffered-chunk guard: the stream loop re-checks controller.signal.aborted before processing each chunk (openai@5.23.2 can swallow a mid-stream AbortError and keep delivering buffered chunks), and the post-loop check rejects with AbortError instead of completing silently after partial output.

Tests

• createMessage abort bridging: rejects with AbortError when the external signal is pre-aborted (no API call); ?�aborts during deferred model discovery; ?�aborts during request creation; aborts the in-flight stream and rejects with AbortError when the external signal aborts; rejects with AbortError when the stream ends normally after a mid-stream abort (swallowed AbortError); does not emit buffered chunks after a mid-stream abort (iterator keeps delivering); removes the external abort listener when the stream completes; non-abort creation/stream errors rethrow unchanged.
• Request-parameter and stream edge coverage pinning the new behavior: reasoning-effort pass-through (sent when the model supports the effort; omitted when the effort is outside the supported set), task metadata forwarded into the requesty-specific request block, tolerance of empty-choices chunks before the first delta, tool_call_partial chunks without a function payload, usage-chunk emission exactly once (including the no-usage stream case).

Mutation-diff gate (local, base d298d4a6f ??head f9a6a7734): 69 valid ??69 killed, 0 timeout, 0 Survived, 0 NoCoverage, 2 Ignored (directed BooleanLiteral/ObjectLiteral on the buffered-chunk guard condition). Combined with the part-1 gate (43 valid: 42 killed, 1 timeout at abort-signal.ts:112:45, 0 Survived, 0 NoCoverage, 2 Ignored), the union matches the pre-split full-run baseline (112 valid: 111 killed, 1 timeout, 0 Survived, 0 NoCoverage, 4 Ignored).

Part of the abort-signal series (round 1). Builds on #674, #901, #1008. Addresses #404. Supersedes #1301 (split B).

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src/api/providers/fetchers/requesty.ts (1)

8-8: LGTM!

Also applies to: 10-13, 32-41

src/api/providers/fetchers/__tests__/requesty.spec.ts (1)

169-169: LGTM!

Also applies to: 175-189, 191-203, 205-212, 215-216, 218-219, 221-237

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📝 Summary

Summary by CodeRabbit

• Bug Fixes
  • Requesty requests now respond more reliably to cancellation and timeouts, including during model discovery and streaming.
  • Aborted requests consistently report cancellation, and results arriving after cancellation are ignored.
  • Model discovery requests now time out after 10 seconds.

Walkthrough

Requesty now propagates abort signals and timeouts through streaming and non-streaming requests. Model discovery requests have a 10-second timeout. Tests cover cancellation, abort-error handling, stream payloads, listener cleanup, and shared model lookup behavior.

Changes

Requesty abort and timeout flow

Layer / File(s)	Summary
Abort-aware promise utility src/api/providers/utils/abort-signal.ts, src/test-utils/settle-guard.ts, src/api/providers/utils/__tests__/abort-signal.spec.ts	Adds rejectOnAbort and a promise settle guard. Tests cover promise settlement, abort rejection, and abort-listener cleanup.
Signal-aware model discovery src/api/providers/fetchers/requesty.ts, src/api/providers/fetchers/__tests__/requesty.spec.ts, src/api/providers/fetchers/__tests__/modelCache.spec.ts, src/api/providers/__tests__/requesty.spec.ts	Adds a 10-second timeout to Requesty model-fetch requests. Tests cover signal forwarding, fetch cancellation, and cancellation isolation for waiters on shared model discovery.
Streaming createMessage cancellation src/api/providers/requesty.ts, src/api/providers/__tests__/requesty.spec.ts, src/eslint-suppressions.json	createMessage passes a per-request signal to the SDK, stops yielding stream content after cancellation, and normalizes abort errors. Tests cover stream payloads, cancellation, and listener cleanup.
completePrompt timeout and late-result handling src/api/providers/requesty.ts, src/api/providers/__tests__/requesty.spec.ts	completePrompt combines caller cancellation with a positive timeout, forwards client options, and rejects aborted or late responses. Tests cover cancellation during model lookup and SDK requests.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~30 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant Caller
  participant RequestyProvider
  participant fetchModel
  participant RequestySDK
  Caller->>RequestyProvider: Send request with abort signal or timeout
  RequestyProvider->>fetchModel: Look up model with cancellation handling
  fetchModel-->>RequestyProvider: Return model record
  RequestyProvider->>RequestySDK: Send request with per-request options
  Caller->>RequestyProvider: Abort request or reach timeout
  RequestyProvider-->>Caller: Reject with provider AbortError

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Merge Risk: ⚪ Minimal · up to c0b23

The two previously identified cancellation and timeout gaps are addressed at the reviewed head. No actionable merge-blocking risk remains on the available evidence.

Security Architecture Review

Security architecture risk: 🔵 Low · up to c0b23

The change improves request cancellation without showing a new way to choose an endpoint or use credentials. A catalog timeout can, however, appear to callers as an empty successful result rather than a failure. Transport behavior has not been verified in the production runtime.

Retained concerns

• Low · reliability · observed: The newly introduced catalog deadline aborts the HTTP request, but an internal timeout can be returned as an empty successful catalog. An uncached caller therefore cannot distinguish that failure from a genuinely empty catalog.

Security review details

Security Blast Radius

• inferred — The inspected change affects Requesty requests and catalog waiters, rather than adding authority over other providers' endpoints or credentials.

Trust Boundaries and Controls

• observed — Cancellation can originate with the caller, but endpoint construction and Bearer-header selection remain in the fetcher; streaming forwards cancellation to the SDK without forwarding new credential authority.

Resilience and Maintainability Implications

• observed — The streaming generator removes its external abort listener on termination. Shared model discovery separates waiter cancellation from ownership of the underlying fetch.

Hardening Proposals

• proposed — Preserve a distinguishable failure result for the catalog fetcher's internal deadline, and verify pre-abort and delayed-body cancellation with the production HTTP adapter.

🚥 Pre-merge checks | ✅ 7 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Regression Evidence	⚠️ Warning	The new timeout behavior has missing focused negative-path coverage. RequestyHandler.completePrompt creates a merged timeout signal before model discovery and races fetchModel() with `rejectOnAbor…	Add deterministic focused tests at the lowest valid layers. In the Requesty provider tests, hold model discovery pending, trigger the merged timeout signal, and assert completePrompt rejects with AbortError without calling the SDK. In t…

✅ Passed checks (7 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Security Boundaries	✅ Passed	No changed path meets the security failure conditions. The PR adds abort-signal and timeout handling to existing Requesty model and completion requests. It does not add secret logging, dynamic code ex…
Persistence Integrity	✅ Passed	No changed persistence path exists. The pull request changes Requesty request cancellation, model discovery timeouts, and test helpers. The only model-cache persistence code (writeModels/`safeWriteJ…
Lifecycle Resource Cleanup	✅ Passed	No changed lifecycle leak was found. RequestyHandler.createMessage removes its external abort listener in finally, including model lookup, request creation, stream failure, normal completion, and …
Title check	✅ Passed	The title clearly identifies the main change: adding abort-signal support to the Requesty API, with related test coverage.
Description check	✅ Passed	The description clearly explains the implementation, scope, related issues, test coverage, and mutation-testing results. It omits several template sections, including the checklist and documentation n…

Full details: Regression Evidence

Explanation

The new timeout behavior has missing focused negative-path coverage. RequestyHandler.completePrompt creates a merged timeout signal before model discovery and races fetchModel() with rejectOnAbort (src/api/providers/requesty.ts:297-312), but the tests only cover caller abort during model lookup and timeout after client.chat.completions.create starts (requesty.spec.ts:1526-1555 and 1622-1641). No test proves that a timeout during model discovery rejects before the SDK call. The fetcher adds a 10-second wall-clock AbortSignal and Axios timeout (fetchers/requesty.ts:32-40), but its tests only assert signal wiring and caller-abort propagation (fetchers/requesty.spec.ts:169-238); they do not exercise timeout-only expiry or the resulting error/partial-catalog branch.

Resolution

Add deterministic focused tests at the lowest valid layers. In the Requesty provider tests, hold model discovery pending, trigger the merged timeout signal, and assert completePrompt rejects with AbortError without calling the SDK. In the Requesty fetcher tests, replace or control the timeout signal with a test controller or fake timer, make Axios reject when that signal aborts, and assert the intended timeout result and error-handling behavior.

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In `@src/api/providers/__tests__/requesty.spec.ts`:
- Line 1046: Strengthen the listener cleanup assertion near the existing
removeSpy check: spy on controller.signal.addEventListener, capture the handler
registered for "abort", and assert removeSpy was called with that exact handler
reference instead of expect.any(Function).

In `@src/api/providers/utils/__tests__/abort-signal.spec.ts`:
- Line 87: Update the abort-signal tests for rejectOnAbort to spy on
addEventListener, capture the registered listener reference, and assert
removeEventListener receives that exact reference instead of
expect.any(Function); apply this to both the resolution and rejection tests.
- Around line 19-35: Extract the duplicated withSettleGuard helper into the
shared test-utils module, preserving its typed signature and timeout behavior.
In src/api/providers/utils/__tests__/abort-signal.spec.ts lines 19-35, remove
the local definition and import the shared helper. In
src/api/providers/__tests__/requesty.spec.ts lines 30-46, remove the local
definition and import the same helper; add the single exported definition
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src/api/providers/utils/abort-signal.ts (1)

107-127: LGTM!

src/api/providers/requesty.ts (2)

143-181: LGTM!

Also applies to: 280-282

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224-224: 📐 Maintainability & Code Quality

No change needed. pnpm-lock.yaml resolves openai to 5.23.2, which matches both comments. The ^5.12.2 declaration permits this version.

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

796-813: LGTM!

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In `@src/api/providers/requesty.ts`:
- Around line 189-190: Remove the any casts from the reasoning_effort handling
in the Requesty provider by selecting the validated value directly from the
literal allowed-effort tuple. Update lastUsage to use the local RequestyUsage |
undefined type instead of any, preserving the existing RequestyUsage contract.

In `@src/api/providers/utils/__tests__/abort-signal.spec.ts`:
- Around line 66-67: Require each abort-listener test to verify a registered
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- Around line 834-836: Update the abort tests around mockCreate and
createMessage to assert that the captured requestSignal is the exact expected
per-request controller signal, rather than only checking it is defined. Add the
identity assertion after the stream settles and preserve the existing abort
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- Around line 1007-1028: Add a failure-path test alongside the successful-stream
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src/api/providers/__tests__/requesty.spec.ts (1)

17-20: LGTM!

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Inline comments:
In @src/api/providers/fetchers/requesty.ts:
- Line 35: Update the Requesty model-discovery fetcher to enforce a 10-second
wall-clock deadline even if response headers arrive before the body completes.
In the function containing the axios.get call, use mergeAbortSignalAndTimeout to
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⚙️ CodeRabbit configuration file

Files:

• src/api/providers/fetchers/__tests__/requesty.spec.ts
• src/api/providers/fetchers/__tests__/modelCache.spec.ts

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

⚙️ CodeRabbit configuration file

Files:

• src/api/providers/fetchers/__tests__/requesty.spec.ts
• src/api/providers/fetchers/__tests__/modelCache.spec.ts
• src/api/providers/fetchers/requesty.ts

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

⚙️ CodeRabbit configuration file

Files:

• src/eslint-suppressions.json
• src/api/providers/fetchers/__tests__/requesty.spec.ts
• src/api/providers/fetchers/__tests__/modelCache.spec.ts
• src/api/providers/fetchers/requesty.ts

Act as an adversarial second-opinion reviewer.

⚙️ CodeRabbit configuration file

Files:

• src/eslint-suppressions.json
• src/api/providers/fetchers/__tests__/requesty.spec.ts
• src/api/providers/fetchers/__tests__/modelCache.spec.ts
• src/api/providers/fetchers/requesty.ts

🔇 Additional comments (1)

src/eslint-suppressions.json (1)

424-424: LGTM!