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feat(api): abort signal support for poe (completePrompt + createMessage) - #1535

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Adds abort-signal support to the Poe provider for both completePrompt and createMessage (round 1 of the abort-signal series).

Supersedes #1301 (split C of 3). #1301's combined gateway-a diff generated 518 mutation-diff preflight mutants, over the 400 cap. This PR carries the Poe portion only: +533/−77 across 2 files, 80 preflight mutants (well under the 400 cap; measured against main @ 0dbd5846f).

completePrompt

  • Accepts CompletePromptOptions (abortSignal and/or timeoutMs); the two are combined through the shared mergeAbortSignalAndTimeout (timeoutMs <= 0 disables the timeout; no manual cleanup needed — AbortSignal.timeout / AbortSignal.any handle the lifecycle).
  • 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") instead of a generic completion error.
  • If the request resolves after the abort, the late result is discarded and AbortError is thrown instead.
  • Reasoning parameter handling is preserved on the abort paths: the reasoning-effort path (incl. modelMaxTokens — a falsy value sets no maxOutputTokens) and the reasoning-budget path behave identically with and without abort options.

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 AI SDK request is driven by the controller's signal, and abort-driven stream failures are normalized to AbortError.

Tests

  • completePrompt: signal/timeout pass-through via mergeAbortSignalAndTimeout, timeoutMs <= 0 / no-options backward compatibility, pre-aborted reject, mid-flight abort reject, late-result discard, reasoning-effort/budget parameter preservation on abort.
  • createMessage bridging: pre-aborted signal rejects with name === "AbortError" (no API call, no model fetch); mid-flight abort aborts the in-flight request and rejects the stream with name === "AbortError"; external listener removed after settlement; exact abort-error message asserted (The Poe request was aborted).

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

Split from Zoo-Code-Org#1301 (feat/abort-r1-gateway-a) so the mutation-diff preflight stays under the 400-mutant limit (the combined gateway-a diff generated 518).

Part of the abort-signal series (round 1). Addresses Zoo-Code-Org#404.
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🪛 GitHub Check: mutation-diff
src/api/providers/poe.ts

[warning] 231-231: Mutation test advisory
src/api/providers/poe.ts:231: Survived OptionalChaining mutant (replacement: mergedAbortSignal.aborted). See the job summary for the complete list and resolution guidance.

🔇 Additional comments (5)
src/api/providers/poe.ts (3)

25-25: LGTM!

Also applies to: 58-84


86-205: LGTM!


210-233: LGTM!

src/api/providers/__tests__/poe.spec.ts (2)

243-569: LGTM!


732-943: LGTM!


📝 Summary

Summary by CodeRabbit

  • Bug Fixes
    • Poe requests can be cancelled before they begin or while they are underway, and cancellation consistently reports as a cancellation error.
    • Caller-provided cancellation signals work alongside configured timeouts. Per-request timeouts take precedence, and non-positive timeout values disable timeouts.
    • Results that arrive after cancellation are rejected, and streaming stops when a request is cancelled.
    • Non-cancellation errors continue to be reported as completion or streaming errors.

Walkthrough

The Poe provider now propagates external cancellation through createMessage and completePrompt. It combines caller signals with timeouts, removes abort listeners after streaming, and maps aborts to AbortError. Tests cover cancellation, errors, request options, and usage behavior.

Changes

Poe abort handling

Layer / File(s) Summary
Streaming message abort lifecycle
src/api/providers/poe.ts, src/api/providers/__tests__/poe.spec.ts
createMessage bridges external abort signals to a per-request controller, passes the signal to streamText, removes listeners after completion, and reports aborted requests as AbortError. Tests cover pre-abort, mid-stream abort, listener cleanup, errors, temperature, usage, and reasoning options.
Prompt completion timeout and abort
src/api/providers/poe.ts, src/api/providers/__tests__/poe.spec.ts
completePrompt combines caller cancellation with the configured or per-call timeout and passes the merged signal to generateText. Tests cover timeout configuration, explicit timeout disabling, caller cancellation, late results, and non-abort failures.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant Caller
  participant PoeHandler
  participant streamText
  Caller->>PoeHandler: provide metadata.abortSignal
  PoeHandler->>streamText: pass controller.signal
  Caller->>PoeHandler: abort request
  PoeHandler-->>Caller: reject with Poe AbortError
Loading
sequenceDiagram
  participant Caller
  participant PoeHandler
  participant generateText
  Caller->>PoeHandler: provide abortSignal or timeoutMs
  PoeHandler->>generateText: pass merged abort signal
  generateText-->>PoeHandler: return result or error
  PoeHandler-->>Caller: return result or Poe AbortError
Loading

Merge Risk: ⚪ Minimal · up to e5e08

This change adds cancellation and timeout handling to the Poe provider, and the supplied evidence shows no outstanding merge-blocking issue. It is ready to merge after normal checks.

Security Architecture Review

Security architecture risk: 🔵 Low · up to e5e08

Cancellation remains scoped to existing requests, with no demonstrated expansion of access or privileges. End-to-end cancellation guarantees remain partly unverified, so the assessment is low risk rather than minimal.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

  • inferred — The demonstrated new control affects requests associated with the supplied cancellation signal and their returned output. Request-local controllers do not introduce handler-wide cancellation authority; production caller identity and broader deployment exposure were not resolved.

Trust Boundaries and Controls

  • observed — Provider credentials and the configured destination remain constructor-owned. The changed request paths add cancellation signals without adding credential overrides, new tool authority, or provider-selection inputs.

Resilience and Maintainability Implications

  • observed — The tests exercise late completion and cancellation during pending usage, but replace both generation entrypoints with mocks. They support output-suppression behavior without proving remote request termination or bounded settlement when downstream work stalls.
🚥 Pre-merge checks | ✅ 6 | ❌ 2

❌ Failed checks (2 warnings)

Check name Status Explanation Resolution
Regression Evidence ⚠️ Warning The new cancellation tests cover one createMessage request at a time. They do not verify the changed request-isolation behavior: aborting one request must not abort another concurrent request. The h… Add a focused PoeHandler unit test that starts two concurrent createMessage streams, aborts the external signal for one stream, and verifies that only its request signal is aborted while the other stream continues and completes normally…
Lifecycle Resource Cleanup ⚠️ Warning PoeHandler.createMessage adds an external abort listener at src/api/providers/poe.ts:69-76 and removes it only in finally at lines 203-205. If a caller disposes the iterator with .return() whi… Make iterator disposal cancel the request and release the external listener even when fullStream.next() is pending. For example, expose an iterator wrapper whose return() aborts the request-local controller and closes the underlying str…
✅ Passed checks (6 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 The changed runtime path only bridges the supplied AbortSignal to a request-local AbortController and passes that signal to the Poe SDK. completePrompt likewise merges a caller signal with a tim…
Persistence Integrity ✅ Passed The changed files are src/api/providers/poe.ts and its tests. The provider changes add abort-signal handling, stream cancellation, usage handling, and completion timeouts. They introduce no persiste…
Title check ✅ Passed The title clearly identifies the Poe provider abort-signal support for both completePrompt and createMessage.
Description check ✅ Passed The description explains the changes, key implementation details, related issues, and test coverage. It does not complete the template checklist or provide a formal test command, but the description i…
Full details: Regression Evidence

Explanation

The new cancellation tests cover one createMessage request at a time. They do not verify the changed request-isolation behavior: aborting one request must not abort another concurrent request. The handler now creates a request-local AbortController in createMessage, and the PR description specifically relies on that design for concurrency safety, but the focused Poe tests do not exercise concurrent streams.

Resolution

Add a focused PoeHandler unit test that starts two concurrent createMessage streams, aborts the external signal for one stream, and verifies that only its request signal is aborted while the other stream continues and completes normally.

Full details: Lifecycle Resource Cleanup

Explanation

PoeHandler.createMessage adds an external abort listener at src/api/providers/poe.ts:69-76 and removes it only in finally at lines 203-205. If a caller disposes the iterator with .return() while the generator is awaiting the next result.fullStream item (line 158), the async-generator return remains queued until that pending read settles. If the read hangs, finally does not run, so the caller's signal retains the listener and the request remains active after disposal. A runtime probe confirmed that .return() does not settle or run finally while the delegated read is pending. The tests cover normal completion cleanup but not disposal during a pending read.

Resolution

Make iterator disposal cancel the request and release the external listener even when fullStream.next() is pending. For example, expose an iterator wrapper whose return() aborts the request-local controller and closes the underlying stream, then removes the external listener. Add a test that starts a pending stream read, calls return(), and verifies cancellation and listener cleanup.

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Actionable comments posted: 3

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Inline comments:
In `@src/api/providers/__tests__/poe.spec.ts`:
- Line 371: Update the abort-listener test around addEventListener and
removeEventListener to capture the callback registered for "abort" and assert
removal receives that exact function reference, rather than using
expect.any(Function). Preserve the existing event-name assertion and cleanup
behavior.
- Line 666: Update the timeout test around handler.completePrompt and its
generateText mock so the mock remains pending until its abortSignal is
triggered; use a controlled timer to advance past timeoutMs, then assert that
completePrompt rejects with the canonical Poe AbortError. Replace the current
early-resolving assertion so the test verifies timeout behavior and the error
path, not merely that an AbortSignal is provided.

In `@src/api/providers/poe.ts`:
- Line 160: Update the streaming flow around fullStream and the chunk yield to
check controller.signal.aborted before each yield, before awaiting result.usage,
and after awaiting usage; throw the signal’s abort error at each checkpoint so
the existing catch block normalizes it to AbortError instead of yielding late
chunks or usage.

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easonLiangWorldedtech added 2 commits October 3, 2026 06:18
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Actionable comments posted: 1


  • 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @src/api/providers/poe.ts:
- Around line 210-230: Update the mergedAbortSignal setup to use this.timeoutMs
when options?.timeoutMs is omitted, while preserving explicit non-positive
timeout values as disabled. Keep the caller-provided abort signal merged with
the selected timeout.

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

25-25: LGTM!

Also applies to: 58-84, 86-143, 157-205, 210-230

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

6-8: LGTM!

Also applies to: 242-569, 731-928

Comment thread src/api/providers/poe.ts
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completePrompt() merged only an explicit per-request timeout, so a caller that
passed neither abortSignal nor timeoutMs sent no signal at all and the request
was bounded by nothing. Fall back to the handler's configured apiRequestTimeout
while an explicit non-positive timeoutMs still means disabled.

Tests: the no-options case now asserts a signal is present, and the caller-signal
case asserts the merged signal is still abortable by the caller.
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