feat(api): abort signal support for requesty (completePrompt + shared helpers) by easonLiangWorldedtech · Pull Request #1537 · Zoo-Code-Org/Zoo-Code

easonLiangWorldedtech · 2026-09-05T15:02:55Z

Adds abort-signal support to the Requesty provider's completePrompt plus the shared abort-signal helper (round 1 of the abort-signal series).

Supersedes #1301 (split B, part 1 of 2). #1301's combined gateway-a diff measured 1139 a+d ??over the 1000 hard line-budget cap ??so the Requesty portion lands as two stacked PRs. This PR carries the shared helper + completePrompt portion: +501/??6 = 527 a+d across 4 files, measured against main @ 0dbd5846f. The unit lands above the 400 soft design target because the helper's kill tests (withSettleGuard settle-race coverage) and the completePrompt abort handling are inseparable: the helper exists only for the phases these changes add, and splitting the helper from its coverage would orphan the kill tests. Measured number and rationale recorded here per the line-budget skill.

completePrompt

Accepts CompletePromptOptions (abortSignal and/or timeoutMs) and forwards them to the OpenAI SDK client: RequestOptions.signal / RequestOptions.timeout are included only when actually set; timeoutMs <= 0 never passes 0 to the SDK (the SDK treats 0 as an immediate abort). The client-level timeout remains the default safety net.
If the caller's signal aborts (or the per-request timeout fires) while the request is in flight, the provider rejects with a DOM-standard AbortError (error.name === "AbortError").
If the request resolves after the abort, the late result is discarded and AbortError is thrown instead.
The cancellation scope is established before model lookup: a pre-aborted call rejects promptly via throwIfAborted(), and a call aborted while model metadata is loading rejects through the shared rejectOnAbort() helper (below). No options remains fully backward compatible (no signal/timeout forwarded to the SDK).

Shared helper

src/api/providers/utils/abort-signal.ts ??extends the merged helper with rejectOnAbort(pending, signal, providerName): awaits pending but rejects with the provider's abort error when signal aborts first. For async phases with no native signal support (model discovery) that must still settle promptly on cancellation; the abort listener is detached once pending settles (success or failure).
abort-signal.spec.ts ??withSettleGuard-wrapped tests for the new helper paths (settle-race coverage: the guard races the settle handler so an unguarded-hang mutant fails fast instead of timing out).

Tests

completePrompt: signal/timeout pass-through, timeoutMs <= 0 handling, backward compatibility without options, pre-aborted reject, mid-flight abort reject, missing/aborted request-signal fail-fast, late-result discard; existing completePrompt assertions adapted to the new two-argument create(params, options) call.

Mutation-diff gate (local, base 0dbd5846f ??head d298d4a6f): 43 valid ??42 killed, 1 timeout (abort-signal.ts:112:45 BlockStatement, the settle-handler race window; ??0 and ??5% of valid), 0 Survived, 0 NoCoverage, 2 Ignored (directed BooleanLiteral/ObjectLiteral on the settle handler, which detaches its own listener).

createMessage bridging and its kill tests land in the stacked follow-up PR #1538 (part 2 of 2).

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

… helpers)

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911-912: LGTM!

📝 Summary

Summary by CodeRabbit

New Features
- Requests can be cancelled using a caller-provided signal or a positive timeout, including during model lookup.
- Already-cancelled requests stop before processing, and responses received after cancellation are discarded.
- Requests without cancellation options continue to work as before; non-positive timeouts are ignored.
Bug Fixes
- Cancellation and timeout failures are reported promptly and consistently as abort errors.

RequestyHandler.completePrompt now handles caller abort signals and positive timeouts during model lookup and completion. It forwards cancellation options to the OpenAI SDK, rejects late responses after cancellation, and preserves non-abort error handling.

Changes: Requesty cancellation handling

Layer / File(s)	Summary
Cancellation during model lookup `src/api/providers/requesty.ts`, `src/api/providers/__tests__/requesty.spec.ts`	`completePrompt` creates cancellation handling before model lookup, rejects pre-aborted calls, and normalizes abort-related lookup failures. Tests cover lookup cancellation and preserve non-abort lookup errors.
Completion request options and outcomes `src/api/providers/requesty.ts`, `src/api/providers/__tests__/requesty.spec.ts`	The completion request forwards merged signals and positive timeouts. Abort failures and late responses reject with the provider abort error. Tests cover compatibility, request options, in-flight cancellation, timeouts, and late responses.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant Caller
  participant RequestyHandler
  participant ModelLookup
  participant OpenAISDK
  Caller->>RequestyHandler: Call completePrompt with signal and timeout
  RequestyHandler->>ModelLookup: Fetch model metadata with merged signal
  ModelLookup-->>RequestyHandler: Return metadata or error
  RequestyHandler->>OpenAISDK: Send completion with signal and positive timeout
  OpenAISDK-->>RequestyHandler: Return response or abort
  RequestyHandler-->>Caller: Return completion or provider AbortError

Merge Risk: 🟡 Moderate · up to 2c25e

Cancelled requests can leave stale model metadata behind for later requests, so this race should be fixed before merging.

Security architecture risk: 🔵 Low · up to a0173

Cancellation handling is narrowly scoped and does not appear to expand credential access or service exposure. It rejects cancelled callers promptly, but already-started model discovery can continue. Deployment-specific cancellation and isolation guarantees remain unverified.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

inferred — The identified changed control scope is the caller's Requesty completion operation. Continuing discovery can affect existing shared metadata caches, but the PR does not establish new tenant, credential, tool or deployment authority.

Trust Boundaries and Controls

inferred — Caller cancellation is not revocation of already-started discovery or its cache writes. The control boundary rejects the caller and prevents continuation into completion when cancellation wins during lookup; completion cancellation relies on the forwarded SDK signal, with an additional guard against returning late results.

Resilience and Maintainability Implications

observed — Existing model-cache coordination deduplicates concurrent discovery, guards cleanup by flight identity, and detaches waiters idempotently. Requesty cancellation does not propagate to that waiter machinery, so discovery remains governed by its existing settlement and catalog-timeout controls rather than the completion caller's lifetime.

Pre-merge checks: 6 · 2

Failed checks: 2 warnings

Check name	Status	Explanation	Resolution
Regression Evidence		The changed model-lookup cancellation path calls `rejectOnAbort` in `src/api/providers/requesty.ts:243-253`. `requesty.spec.ts:797-826` covers an lookup that never settles, and `abort-signal.spec.ts:1…	Add a focused `rejectOnAbort` or Requesty integration test with a deferred model-lookup promise. Start the request, abort after lookup starts, reject the deferred lookup, and verify the returned promise remains rejected with the provider `A…
Lifecycle Resource Cleanup		The changed cancellation path still leaves model-catalog work running after cancellation. `completePrompt` wraps `this.fetchModel()` in `rejectOnAbort` at `src/api/providers/requesty.ts:243-247`, but …	Pass the merged signal from `completePrompt` into `fetchModel(signal)`, then pass it as `signal` in the `getModels` options. Preserve the model-cache single-flight semantics so abort detaches only this waiter and aborts the shared catalog f…

Passed checks: 6 passed

Check name	Status	Explanation
Title check		The title clearly identifies the main change: adding abort-signal support to Requesty’s completePrompt and shared helpers.
Description check		The description explains the implementation, linked issue `#404`, compatibility behavior, test coverage, mutation results, and follow-up scope. It does not include the template checklist, documentation-…
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		No changed path meets the security failure condition. The PR changes `RequestyHandler.completePrompt` to create and forward an abort signal and a positive timeout, then normalize cancellation errors. …
Persistence Integrity		No changed persistence path exists. The pull request changes `RequestyHandler.completePrompt` to merge cancellation signals, await model lookup, call the OpenAI SDK, and reject late responses. It does…

Full details: Description check

Explanation

The description explains the implementation, linked issue #404, compatibility behavior, test coverage, mutation results, and follow-up scope. It does not include the template checklist, documentation-impact section, or contact details, but the core required change and test information are complete.

Full details: Security Boundaries

Explanation

No changed path meets the security failure condition. The PR changes RequestyHandler.completePrompt to create and forward an abort signal and a positive timeout, then normalize cancellation errors. It does not add secret or PII logging, dynamic code execution, or changes to authentication, model allowlists, or approval controls. The prompt and model are sent through the existing OpenAI Requesty call path; that behavior is not newly introduced by this diff.

Full details: Persistence Integrity

Explanation

No changed persistence path exists. The pull request changes RequestyHandler.completePrompt to merge cancellation signals, await model lookup, call the OpenAI SDK, and reject late responses. It does not add or modify a state write, persistence operation, rollback path, or persisted default propagation. The reviewed range changes only requesty.ts and its tests; abort-signal.ts is not changed in the authoritative diff.

Full details: Regression Evidence

Explanation

The changed model-lookup cancellation path calls rejectOnAbort in src/api/providers/requesty.ts:243-253. requesty.spec.ts:797-826 covers an lookup that never settles, and abort-signal.spec.ts:172-188 covers a late resolution. No focused test aborts an active lookup, then rejects it, and verifies the Requesty call remains an AbortError without an unhandled rejection. The late-rejection lifecycle remains uncovered.

Resolution

Add a focused rejectOnAbort or Requesty integration test with a deferred model-lookup promise. Start the request, abort after lookup starts, reject the deferred lookup, and verify the returned promise remains rejected with the provider AbortError. Also verify that the late lookup rejection does not produce an unhandled rejection.

Full details: Lifecycle Resource Cleanup

Explanation

The changed cancellation path still leaves model-catalog work running after cancellation. completePrompt wraps this.fetchModel() in rejectOnAbort at src/api/providers/requesty.ts:243-247, but fetchModel() calls getModels(...) without signal at lines 104-106. On an uncached lookup, getModels therefore registers a waiter without the caller signal. If the request aborts while lookup is pending, only the outer promise rejects; the waiter and shared catalog fetch remain active until settlement or the 15-second catalog bound. This is a concrete lifecycle leak introduced by the new cancellation path.

Resolution

Pass the merged signal from completePrompt into fetchModel(signal), then pass it as signal in the getModels options. Preserve the model-cache single-flight semantics so abort detaches only this waiter and aborts the shared catalog fetch when it is the last waiter. Add a test that aborts during an uncached Requesty model lookup and verifies the lookup waiter detaches and the sole-waiter provider fetch receives cancellation.

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github-actions · 2026-09-05T15:03:05Z

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codecov · 2026-09-05T15:07:17Z

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Actionable comments posted: 6

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Inline comments:
In `@src/api/providers/__tests__/requesty.spec.ts`:
- Around line 792-797: Update the pre-aborted request test around
handler.completePrompt to assert that mockCreate was not called after the
AbortError rejection. Preserve the existing error assertions and align the check
with the sibling lookup-abort test.
- Around line 769-774: Update the request creation assertion in the requesty
test to also require that createOptions includes a forwarded signal when
timeoutMs is 5000 and no caller signal is provided. Preserve the existing
timeout assertion and verify signal presence or the merged timeout signal
behavior so regressions that omit signal forwarding fail.

In `@src/api/providers/requesty.ts`:
- Line 266: Update the abort error creation in both abort paths of the relevant
method to pass this.providerName instead of the hardcoded "Requesty" literal,
matching the existing path that already uses the provider field.

In `@src/api/providers/utils/__tests__/abort-signal.spec.ts`:
- Line 87: Update both detach tests around rejectOnAbort to spy on
addEventListener, capture the registered handler, and assert removeEventListener
is called with that exact handler reference instead of expect.any(Function).
- Around line 65-67: Strengthen the already-aborted branch assertion in the
rejectOnAbort test to verify the rejection message as well as name, matching
createAbortError("TestProvider") and preserving the expected provider-specific
abort error contract.
- Around line 19-35: Extract the duplicated withSettleGuard helper, including
its 500ms default and Stryker guard behavior, into a shared utility under
src/test-utils/. Remove the local definitions from both specs and import the
shared helper in each, preserving the existing API and behavior.

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src/api/providers/utils/abort-signal.ts (1)

96-127: LGTM!

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

26-32: LGTM!

Also applies to: 221-239

254-257: 🩺 Stability & Availability

No change needed. openai-node v5.12.2 defines both RequestOptions.signal and RequestOptions.timeout. The lockfile resolves openai to 5.23.2, which also supports both members.

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src/api/providers/requesty.ts (1)
231-231: 🩺 Stability & Availability | 🟠 Major | 🏗️ Heavy lift

Guard late model-lookup results before updating this.models.

If a caller aborts during this.fetchModel() and starts another completion on the same RequestyHandler, rejectOnAbort rejects only the wrapper. The underlying lookup still completes and fetchModel() still assigns this.models. That late result can overwrite a newer lookup and change the model parameters used by a later request.

Propagate requestAbortSignal into the model fetch if supported. Otherwise, guard the cache write with a request-generation check before accepting the result.
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In `@src/api/providers/requesty.ts` at line 231, Update the model lookup flow
around RequestyHandler.fetchModel and rejectOnAbort so an aborted request cannot
commit a late result to this.models. Propagate requestAbortSignal into
fetchModel when supported; otherwise add a request-generation check before the
cache assignment, preserving newer lookups and later request parameters.
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Inline comments:
In `@src/api/providers/__tests__/requesty.spec.ts`:
- Line 747: Update the request assertion in the relevant requesty test to verify
that the SDK receives the exact caller signal from the test’s AbortController,
replacing the type-only expect.any(AbortSignal) check while preserving the
surrounding request expectations.

---

Outside diff comments:
In `@src/api/providers/requesty.ts`:
- Line 231: Update the model lookup flow around RequestyHandler.fetchModel and
rejectOnAbort so an aborted request cannot commit a late result to this.models.
Propagate requestAbortSignal into fetchModel when supported; otherwise add a
request-generation check before the cache assignment, preserving newer lookups
and later request parameters.

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src/api/providers/utils/__tests__/abort-signal.spec.ts (1)

6-9: LGTM!

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26-32: LGTM!

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Inline comments:
In `@src/api/providers/__tests__/requesty.spec.ts`:
- Line 744: Update the test around timeoutSignalSpy to assert that
AbortSignal.timeout was called with 5000 milliseconds, and verify it was called
exactly once when the test requires a single signal. Keep the existing signal
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- Line 758: Update the test cleanup around timeoutSignalSpy so mockRestore
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src/api/providers/__tests__/requesty.spec.ts (1)

20-20: LGTM!

Also applies to: 782-782

…eady addressed; stale review commit needs a fresh pass)

easonLiangWorldedtech · 2026-10-03T00:52:49Z

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All prior findings are already addressed at the current head (the only change since the last review is the clock-pinning fix in lite-llm.spec.ts); the recorded review is still tied to an older commit, so a fresh pass at this head is needed.

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Inline comments:
Review comments at @src/api/providers/utils/abort-signal.ts:
- Around line 107-112: Update rejectOnAbort to attach a rejection handler to
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src/api/providers/__tests__/requesty.spec.ts
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src/api/providers/utils/__tests__/abort-signal.spec.ts
src/api/providers/utils/abort-signal.ts
src/test-utils/settle-guard.ts

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src/api/providers/utils/abort-signal.ts
src/api/providers/utils/__tests__/abort-signal.spec.ts
src/api/providers/requesty.ts
src/api/providers/__tests__/requesty.spec.ts

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

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src/api/providers/utils/abort-signal.ts
src/api/providers/utils/__tests__/abort-signal.spec.ts
src/api/providers/requesty.ts
src/api/providers/__tests__/requesty.spec.ts

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src/api/providers/utils/abort-signal.ts
src/api/providers/utils/__tests__/abort-signal.spec.ts
src/api/providers/requesty.ts
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src/api/providers/utils/abort-signal.ts
src/api/providers/utils/__tests__/abort-signal.spec.ts
src/api/providers/requesty.ts
src/api/providers/__tests__/requesty.spec.ts

🔇 Additional comments (5)

src/api/providers/utils/abort-signal.ts (1)

96-127: LGTM!

src/api/providers/utils/__tests__/abort-signal.spec.ts (1)

6-96: LGTM!

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

221-239: LGTM!

Also applies to: 250-258, 270-274

src/test-utils/settle-guard.ts (1)

1-26: LGTM!

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

619-1004: LGTM!

…aborted CodeRabbit finding at 2d12c01: rejectOnAbort returned early on an already-aborted signal without attaching a handler to pending, so a later rejection of the in-flight work surfaced as an unhandled rejection. The early return now consumes it; the test asserts no unhandled rejection is reported.

Zoo-Code-Org#1651 landed, so the shared abort-signal helpers and the settle-guard helper are the single implementations: this branch's duplicate copies are dropped and the requesty unit now calls the landed helpers. 66 tests pass unchanged.

easonLiangWorldedtech · 2026-10-04T05:01:27Z

Conflict resolution against upstream main (3859e5dd8), pushed as bf3afa529.

The duplicated abort-signal.ts and its spec resolve to main's version (#1651 is the single implementation); src/test-utils/settle-guard.ts is identical to main's and is dropped. This branch keeps only its own unit: requesty.ts (completePrompt) and its spec.

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easonLiangWorldedtech · 2026-10-04T05:19:16Z

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Conflict in requesty.ts completePrompt preamble: keep the unit's abort wiring (mergeAbortSignalAndTimeout + throwIfAborted + rejectOnAbort around fetchModel) over main's parameter rename (_options), which the unit consumes. requesty.spec.ts auto-merged; 34/34 green, tsc/eslint/ prettier clean.

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Inline comments:
Review comments at @src/api/providers/__tests__/requesty.spec.ts:
- Around line 893-912: Update the rejection assertion in the timeout test for
RequestyHandler.completePrompt to verify both the AbortError name and the
provider-specific abort message, matching the sibling cancellation tests.

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

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src/api/providers/requesty.ts: 2

235-254: LGTM!

265-289: LGTM!

src/api/providers/__tests__/requesty.spec.ts: 1

727-892: LGTM!

Also applies to: 913-1004

The name assertion alone only proves that a TimeoutError did not reach handleOpenAIError; it does not pin the complete abort contract. Assert the provider-specific message the sibling cancellation tests use.

feat(api): abort signal support for requesty (completePrompt + shared…

d298d4a

… helpers)

easonLiangWorldedtech requested review from JamesRobert20, edelauna, hannesrudolph, navedmerchant and taltas as code owners September 5, 2026 15:02

easonLiangWorldedtech mentioned this pull request Sep 5, 2026

feat(api): abort signal support for requesty (createMessage + kill tests) #1538

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Comment thread src/api/providers/__tests__/requesty.spec.ts

test(requesty): pin the provider abort message in the timeout test

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The name assertion alone only proves that a TimeoutError did not reach handleOpenAIError; it does not pin the complete abort contract. Assert the provider-specific message the sibling cancellation tests use.

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