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feat(api): shared abort-signal cancellation-scope helpers - #1651

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Zoo-Code-Org:mainfrom
easonLiangWorldedtech:feat/abort-r1-u1-abort-signal-util
Oct 3, 2026
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Zoo-Code-Org:mainfrom
easonLiangWorldedtech:feat/abort-r1-u1-abort-signal-util

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Shared-util piece of the abort-signal series (round 1): extends src/api/providers/utils/abort-signal.ts with the helpers the gateway providers use to run request phases inside a cancellation scope.

  • resolveModelWithAbort(fetchModel, abortSignal, providerName): runs model resolution inside a cancellation scope - a pre-aborted signal fast-fails before any catalog/SDK work, a rejectOnAbort race settles the lookup with the provider AbortError when the signal fires mid-resolution, and abort-flavored lookup failures are normalized; any other resolution failure propagates unchanged.
  • rejectOnAbort(pending, signal, providerName): the race primitive - rejects with createAbortError(providerName) when the signal fires before pending settles; the abort listener detaches when pending settles, so a task-scoped signal does not accumulate listeners.
  • createAbortError(providerName): fresh error satisfying the Task.ts abort contract (name === "AbortError", message ending in "aborted").
  • isRequestAborted(error, signal?): wider abort detection - an aborted signal, a DOM AbortError, the OpenAI/Anthropic SDK APIUserAbortError (name check), or the exact "Request was aborted." message. The name/message checks now require a real Error instance, so a plain object that merely looks like an abort propagates unchanged.
  • Removed throwIfAborted - dead code: nothing on main (or in the sibling abort PRs) calls it; it was exercised only by its own unit tests.

Tests: unit specs for all four helpers plus the new settle-guard test utility.

Series and unit

Unit 1/3 of the #1295 split (content source: 62f596c5d). Merge order: this unit first, then the opencode-go unit, then the unbound/vercel/zoo unit. No provider behavior changes in this unit.

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

Review response (maintainer review of #1295)

  • The shared util keeps the existing surface (mergeAbortSignalAndTimeout, mergeAbortSignals untouched) plus the new helpers; throwIfAborted was removed as dead code and isRequestAborted was tightened with the instanceof Error requirement (kill-tested: plain-object abort look-alikes propagate unchanged).
  • The guard, the race, and the abort normalization that the gateway providers need now live once here as resolveModelWithAbort; each provider unit exercises it end-to-end (pre-aborted fast-fail, mid-resolution race, normalization, no-signal pass-through).

Evidence

  • vitest: 29/29 passing in the util suite (35 changed executable lines, all covered)
  • Local Stryker mutation gate (unit delta vs own base): 43 valid mutants (≤400), 41 killed, 2 directive-ignored (the rejectOnAbort settle-handler pair, with an event-fires-once equivalence proof), 0 Survived / 0 NoCoverage / 0 Timeout

…utils

Extend src/api/providers/utils/abort-signal.ts with the abort-signal
series helpers used by the gateway providers:

- isRequestAborted(error, signal): wider abort detection - an aborted
  signal, a DOM AbortError, the OpenAI/Anthropic SDK APIUserAbortError
  (name check), or the exact SDK abort message "Request was aborted." -
  trusting name/message only on real Error instances so a plain object
  that merely looks like an abort propagates unchanged
- createAbortError(providerName): fresh error satisfying the Task.ts
  abort contract (name "AbortError", message ending in "aborted")
- rejectOnAbort(pending, signal, providerName): settle a signal-less
  async phase (model discovery) on the provider AbortError when the
  signal fires first; the abort listener detaches when pending settles
- resolveModelWithAbort(fetchModel, signal, providerName): run model
  resolution inside a cancellation scope - entry fast-fail for a
  pre-aborted signal, the rejectOnAbort race while the lookup is
  pending, and normalization of abort-flavored lookup failures; any
  other resolution failure propagates unchanged

Includes direct unit tests for the resolveModelWithAbort cancellation
scope (pre-aborted fast-fail, no-signal pass-through, mid-resolution
race, abort normalization, non-abort propagation), the
isRequestAborted instanceof tightening tests, and the settle-guard
test utility.

Unit 1/3 of the Zoo-Code-Org#1295 split (content source: 62f596c).
Part of the abort-signal series (round 1). Builds on Zoo-Code-Org#674, Zoo-Code-Org#901, Zoo-Code-Org#1008.
Addresses Zoo-Code-Org#404.
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58-58: LGTM!

Also applies to: 69-72


📝 Summary

Summary by CodeRabbit

  • Bug Fixes

    • Improved cancellation handling for provider model requests, including requests aborted before or during loading.
    • Standardized abort errors while preserving other request failures.
    • Prevented plain objects and strings resembling abort errors from being classified as cancellations.
  • Tests

    • Added coverage for cancellation races, pre-aborted requests, error propagation, listener cleanup, and model lookup behavior.
    • Added safeguards that make tests fail quickly when asynchronous operations do not settle.

Walkthrough

Provider utilities add abort-aware promise and model resolution. They normalize abort failures and classify abort names and messages only on Error instances. Tests cover abort races, listener cleanup, error propagation, and settlement timeouts.

Changes

Abort-aware resolution

Layer / File(s) Summary
Abort-aware provider resolution
src/api/providers/utils/abort-signal.ts
Adds rejectOnAbort and resolveModelWithAbort to handle pre-aborted signals, abort races, listener cleanup, and abort-error normalization. isRequestAborted now requires an Error instance for name- and message-based matches.
Abort resolution tests and settlement guard
src/api/providers/utils/__tests__/abort-signal.spec.ts, src/test-utils/settle-guard.ts
Tests cover promise settlement, abort races, lookup behavior, listener removal, error propagation, and stricter abort classification. withSettleGuard rejects pending promises after a timeout.

Priority: ⬇️ Low

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

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant Caller
  participant resolveModelWithAbort
  participant fetchModel
  participant AbortSignal
  Caller->>resolveModelWithAbort: request model
  resolveModelWithAbort->>fetchModel: start lookup
  AbortSignal-->>resolveModelWithAbort: abort event
  resolveModelWithAbort-->>Caller: provider AbortError
Loading

Merge Risk: ⚪ Minimal · up to 84c1f

The change adds abort-aware helpers and tests without introducing a production caller, so no PR-specific merge blocker is established.

Architecture Summary

Architecture risk: 🔵 Low · up to 84c1f

The change affects 1 system.

Changed systems: src

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

  • observed — src (api) was modified; 3 changed files map to changed impact.

Before / after behavior

  • observed — Modified behavior in src/test-utils/settle-guard.ts: Adds the exported withSettleGuard helper, which races the input promise against a setTimeout that rejects with a timed-out error after ms (default 500); on resolution or rejection it clears the timer and forwards the value or error so pending-forever promises fail fast instead of timing out inconclusively under Stryker.
  • observed — Modified behavior in src/api/providers/utils/abort-signal.ts: isRequestAborted now requires an Error instance for abort-name and exact SDK-message matches; the previous duck-typed checks also accepted plain objects. The aborted-signal check remains.
  • observed — Modified behavior in src/api/providers/utils/abort-signal.ts: Adds rejectOnAbort: it immediately rejects with the provider AbortError if the signal is already aborted; otherwise, it rejects if abort fires first and removes its listener when the pending promise fulfills or rejects. The underlying promise continues running after abort.
  • observed — Modified behavior in src/api/providers/utils/abort-signal.ts: Adds resolveModelWithAbort, which rejects with the provider AbortError before starting lookup when the signal is already aborted, races lookup against abort when a signal exists, and normalizes abort-shaped failures while rethrowing other failures unchanged.
🚥 Pre-merge checks | ✅ 7 | ❌ 1

❌ Failed checks (1 warning)

Check name Status Explanation Resolution
Lifecycle Resource Cleanup ⚠️ Warning rejectOnAbort cleans its abort listener correctly: { once: true } handles the abort-first path, and both pending settlement handlers call removeEventListener. The changed helper still abandons t… Make the model-resolution operation abortable or give rejectOnAbort an explicit cancellation/cleanup callback. Pass the caller's signal into the provider lookup and cancel it when the abort event wins. Ensure the cancellation path release…
✅ 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.
Regression Evidence ✅ Passed PASS. abort-signal.spec.ts provides focused unit coverage for the changed behavior at the lowest valid layer. It covers pre-aborted signals, abort-first and pending-first outcomes, pending success a…
Security Boundaries ✅ Passed No changed path meets a failure condition. The reviewed diff changes only the abort utility, its tests, and the test-only settle guard. rejectOnAbort and resolveModelWithAbort perform promise canc…
Persistence Integrity ✅ Passed PASS: The changed files only add in-memory abort-signal helpers, tests, and a test-only settle guard. The diff contains no persistence read, write, migration, rollback, or default-propagation path. Th…
Title check ✅ Passed The title clearly and concisely describes the main change: shared API abort-signal cancellation-scope helpers.
Description check ✅ Passed The description is substantially complete. It identifies the related issues, explains the helper behavior and design, documents testing and mutation results, and provides series context. Several optio…
Full details: Lifecycle Resource Cleanup

Explanation

rejectOnAbort cleans its abort listener correctly: { once: true } handles the abort-first path, and both pending settlement handlers call removeEventListener. The changed helper still abandons the underlying operation after cancellation. At abort-signal.ts:99-103, the implementation explicitly keeps pending running, and resolveModelWithAbort accepts only () => Promise<T> (:146-157), so it has no cancellation or cleanup handle. If a provider lookup never settles, aborting rejects the caller while the lookup task remains active; a retry can then start duplicate lookup work while the first lookup is still running.

Resolution

Make the model-resolution operation abortable or give rejectOnAbort an explicit cancellation/cleanup callback. Pass the caller's signal into the provider lookup and cancel it when the abort event wins. Ensure the cancellation path releases any provider/network resources and removes the abort listener. If the lookup must remain shared after the caller aborts, move ownership to a single-flight coordinator with explicit waiter release and terminal cleanup instead of abandoning the promise from this helper.

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Codecov Report

❌ Patch coverage is 96.87500% with 1 line in your changes missing coverage. Please review.

Files with missing lines Patch % Lines
src/test-utils/settle-guard.ts 88.88% 1 Missing ⚠️

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Actionable comments posted: 1


  • 🪄 Fix CodeRabbit comments on this PR
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Review comments at @src/api/providers/utils/abort-signal.ts:
- Around line 109-110: Update rejectOnAbort to handle rejection from pending
before returning the abort error when signal is already aborted, preventing an
unhandled rejection. Add a regression test covering an already-aborted signal
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Actionable comments posted: 1


  • 🪄 Fix CodeRabbit comments on this PR
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