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).

---

Updated this round (2026-10-13)

Merged current upstream main into the branch to clear the dirty state. One conflict in requesty.ts: main added getModelCacheScope/fetchModels at the position of this branch's single-flight design comment — kept both (main's methods plus the comment, reworded to note the flight's own controller signal is shared by all waiters). Also adapted the branch's "forwards the caller's cancellation signal to Requesty model discovery" modelCache test to main's handler-based getModels(options, handler) signature: the single-flight detach semantics the test pins are unchanged (a caller abort rejects the waiter with the canonical AbortError), only the fetch double moved from the removed getRequestyModels mock to a handler fetchModels double.

Verification at this head: 132/132 green across the three touched specs (requesty provider, fetchers/requesty, fetchers/modelCache); tsc --noEmit → 0 errors; per-file ESLint (--max-warnings=0) clean; prettier --check clean on touched files.

---

Updated this round (2026-10-13, review follow-up)

• The abort test now asserts the merged signal's runtime type (toBeInstanceOf(AbortSignal)) alongside the existing caller-signal linkage assertions. The suggested post-abort aborted assertion was skipped as it duplicates the existing abort-driven rejection check.

Verification at this head: 57/57 green in requesty.spec.ts; per-file ESLint (--max-warnings=0) clean; tsc --noEmit → 0 errors; prettier --check clean on touched files.

Stryker directive removal (equivalence notes)

The one // Stryker disable next-line ObjectLiteral,BooleanLiteral in requesty.ts was removed. Equivalence: on externalAbortSignal.addEventListener("abort", onExternalAbort, { once: true }), an AbortSignal fires abort exactly once per signal so the once flag cannot change invocation count, and the listener is removed explicitly in the finally block. No test can distinguish the mutants.

Timeout guard hardening (helper port)

Port of the #1300 CodeRabbit finding to the shared mergeAbortSignalAndTimeout helper: non-finite timeoutMs (Infinity) now means "no timeout" instead of throwing ERR_OUT_OF_RANGE from AbortSignal.timeout, and finite delays are capped at 2^31-1 ms (Node clamps larger delays to 1ms, which aborted requests almost immediately). Regression tests added; negative controls fail exactly the two new tests. Identical helper fix lands in every unit of the abort series (merge-order aware); canonical copy in #1293.

Fractional-timeout rounding wave

Follow-up CR round: Node validates AbortSignal.timeout delays as uint32, so finite fractions (1500.5, 0.5) threw ERR_OUT_OF_RANGE like Infinity did. mergeAbortSignalAndTimeout now rounds delays up (a positive fraction never becomes 0 ms) before capping at 2^31-1 ms; regression test mergeAbortSignalAndTimeout(undefined, 1.5). Identical helper patch in every unit of the series (merge-order aware, canonical in #1293).

Assertion strengthening (rounding wave follow-up)

The fractional-timeout test now spies AbortSignal.timeout and pins the received delay (2 for 1.5, 1 for 0.5, never 0) instead of only asserting no-throw plus eventual abort; a round-down mutation (Math.ceil -> Math.floor) fails exactly this test. Identical patch in every unit of the series (canonical in #1293).

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📝 Summary

Summary by CodeRabbit

• New Features
  • Requesty streaming and completion requests support cancellation. Aborted requests stop producing results and return an abort error, including when cancellation occurs during model discovery or while awaiting a response.
  • Completion requests honor positive caller-provided timeouts, and model discovery requests have a 10-second limit. Non-positive timeouts are not applied.

Requesty now applies cancellation and timeout signals to model discovery, streaming requests, and completions. Streaming stops processing chunks after cancellation. Tests cover signal propagation, abort handling, request metadata, and stream edge cases.

Changes: Requesty abort and timeout flow

Layer / File(s)	Summary
Timeout signal handling src/api/providers/utils/abort-signal.ts, src/api/providers/utils/__tests__/abort-signal.spec.ts	Timeout merging disables non-finite or non-positive values, rounds fractional delays up, and caps large delays. Tests cover these cases.
Bounded model discovery src/api/providers/fetchers/requesty.ts, src/api/providers/fetchers/__tests__/requesty.spec.ts, src/api/providers/fetchers/__tests__/modelCache.spec.ts	Model discovery combines an optional caller signal with a 10-second deadline and configures the same Axios timeout. Tests cover signal forwarding, timeout configuration, and cancellation.
Streaming request cancellation src/api/providers/requesty.ts, src/api/providers/__tests__/requesty.spec.ts, src/eslint-suppressions.json	createMessage passes a request-specific signal to the SDK, races model lookup against cancellation, and stops processing stream data after abort. Tests cover abort behavior, listener cleanup, reasoning effort, task metadata, and stream chunk cases.
Completion cancellation and timeouts src/api/providers/requesty.ts, src/api/providers/__tests__/requesty.spec.ts	completePrompt forwards a merged signal and positive timeout to the SDK. Tests cover lookup and request cancellation, late responses, and non-abort errors.

Priority: ⬇️ Low

Estimated code review effort: 4 (Complex) | ~45 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant Caller
  participant createMessage
  participant ModelLookup
  participant RequestySDK
  Caller->>createMessage: provide request and abort signal
  createMessage->>ModelLookup: look up model without per-request signal
  ModelLookup-->>createMessage: return model record
  createMessage->>RequestySDK: create stream with request-specific signal
  Caller->>createMessage: abort request
  createMessage-->>Caller: reject with provider AbortError

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Merge Risk: ⚪ Minimal · up to 7445a

This change adds cancellation and timeout handling to Requesty requests, and the stream now stops emitting output after an abort. No remaining merge-blocking risk was found.

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		The standing regression gaps are still present at the current head. I checked the code and tests directly. 1. completePrompt timeout during model lookup (changed behavior). completePrompt now merges…	1. Add a deterministic completePrompt test in src/api/providers/__tests__/requesty.spec.ts. Defer the getModels mock, call completePrompt with a short timeoutMs, let the merged timeout elapse, then assert the rejection is `AbortEr…

Passed checks: 7 passed

Check name	Status	Explanation
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Security Boundaries		The changed code adds abort-signal plumbing to the Requesty provider. I reviewed the diff for src/api/providers/requesty.ts, src/api/providers/utils/abort-signal.ts, and `src/api/providers/fetcher…
Persistence Integrity		The check covers persistence paths: unawaited writes, non-atomic writes, missing rollback, or unpropagated persisted defaults. The PR changes eight files, all in the Requesty provider, its model fetch…
Lifecycle Resource Cleanup		The changed lifecycle paths were reviewed against the check's failure condition: a concrete changed path that leaks a listener, watcher, provider, timer, or task, or duplicates work after cancellation…
Description check		The description clearly explains the Requesty abort-signal changes, implementation details, related issues, test coverage, verification results, and review considerations. It does not use every templa…
Title check		The title is concise, specific, and accurately identifies the main change: abort-signal support for the Requesty provider's createMessage flow and related tests.

Full details: Regression Evidence

Explanation

The standing regression gaps are still present at the current head. I checked the code and tests directly. 1. completePrompt timeout during model lookup (changed behavior). completePrompt now merges timeoutMs into the signal before model lookup and wraps this.fetchModel() in rejectOnAbort (src/api/providers/requesty.ts, ~lines 316-329). The test at src/api/providers/__tests__/requesty.spec.ts:1622-1641 ("rejects with AbortError when only a timeout is provided and it elapses") uses the default immediately resolved getModels. It only emulates the SDK-phase timeout. No test defers getModels, lets the timeout elapse during lookup, and asserts that mockCreate is not called. The lookup-phase timeout path is therefore unverified. 2. getRequestyModels 10-second bound (changed behavior). The fetcher now passes a merged signal and timeout: 10_000 to Axios (src/api/providers/fetchers/requesty.ts, ~lines 32-41). The tests in src/api/providers/fetchers/__tests__/requesty.spec.ts (lines 169-257) only check wiring and caller-signal cancellation. The standalone-timeout test asserts aborted === false. No test lets the timeout-only signal fire. No test checks that a timeout-driven rejection reaches the catch and returns the models collected so far (the path the timeout change newly exercises, since a non-caller abort is not rethrown). Both gaps match the standing failure. The rest of the diff shows substantial coverage for the createMessage and caller-abort paths, but these two timeout behaviors lack focused evidence.

Resolution

1. Add a deterministic completePrompt test in src/api/providers/__tests__/requesty.spec.ts. Defer the getModels mock, call completePrompt with a short timeoutMs, let the merged timeout elapse, then assert the rejection is AbortError and that mockCreate was not called. 2. Add a getRequestyModels test in src/api/providers/fetchers/__tests__/requesty.spec.ts that uses fake timers or a controlled timeout signal. Make the mocked axios.get reject when the request signal aborts without a caller abort. Then assert the intended returned models and the error-handling behavior (the logged error, with models collected so far returned).

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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
alongside the existing shared typed test helpers.

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107-127: LGTM!

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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.

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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
callback exists and is a function before asserting removal, then compare that
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In `@src/api/providers/__tests__/requesty.spec.ts`:
- 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
behavior checks.
- Around line 1007-1028: Add a failure-path test alongside the successful-stream
cleanup test using an external AbortController signal, make the mocked Requesty
request reject without aborting the signal, and assert that createMessage
cleanup removes the exact listener registered by addEventListener. Keep the
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src/api/providers/__tests__/requesty.spec.ts (1)

17-20: LGTM!

Also applies to: 265-267, 269-414, 447-447, 481-481, 515-515, 549-549, 688-688, 770-787, 789-828, 875-954, 996-1005, 1030-1042, 1169-1185

[easonLiangWorldedtech]

Conflict resolution against upstream main (3859e5dd8), pushed as 6d5a4bdd7.

The duplicated abort-signal.ts and its spec resolve to main's version (#1651 is the single implementation). This branch keeps its own unit: the requesty createMessage change, the fetchers, and their specs.

Validation at this head: tsc --noEmit clean, 164 tests green, prettier and eslint clean. CI green.

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @src/api/providers/__tests__/requesty.spec.ts:
- Around line 1724-1726: Add an assertion that requestSignal is an instance of
AbortSignal in the merged-signal test, while keeping the existing defined and
caller-signal linkage assertions.

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

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

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

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🔇 Additional comments (4)

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

177-177: 🩺 Stability & Availability

The concern is refuted. The abort handler calls detach(), which aborts the shared controller and synchronously deletes the matching inFlightRefresh entry when the last waiter leaves. A later lookup cannot wait on this never-settling mock promise.

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

32-38: LGTM!

Also applies to: 104-108, 163-238, 239-310

---

313-331: LGTM!

Also applies to: 342-366

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

537-537: LGTM!

Also applies to: 571-571, 605-605, 639-639, 1429-1723

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