fix(ai-fal): handle errors from fal result fetch on completed jobs#396
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AlemTuzlak merged 4 commits intoTanStack:mainfrom Mar 30, 2026
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Map fal.ai's FAILED queue status to 'failed' instead of falling through to the default case which incorrectly returned 'processing'. Unknown statuses now also map to 'failed' as a safety net. Error details from fal responses are surfaced in VideoStatusResult.error. Closes TanStack#394 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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📝 WalkthroughWalkthroughUpdates fal.ai video adapter and generateVideo activity to treat result-fetch failures for completed jobs as Changes
Sequence Diagram(s)sequenceDiagram
participant Client
participant Adapter
participant FalClient
participant Activity
Client->>Adapter: poll getVideoStatus(jobId)
Adapter->>FalClient: queue.status(jobId)
FalClient-->>Adapter: { status: "COMPLETED" | "FAILED" | ... , ... }
alt status == COMPLETED
Adapter->>FalClient: queue.result(jobId)
FalClient--xAdapter: throws validation/error (body.detail)
Adapter->>Activity: emit video:request:completed (status: 'failed', error)
Adapter-->>Client: { status: 'failed', error, progress }
else status == FAILED
Adapter->>Activity: emit video:request:completed (status: 'failed', error)
Adapter-->>Client: { status: 'failed', error }
else other/unknown
Adapter-->>Client: { status: 'failed' }
end
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Actionable comments posted: 1
🧹 Nitpick comments (1)
packages/typescript/ai-fal/tests/video-adapter.test.ts (1)
217-227: Good safety net test for unknown statuses.This test ensures that any unrecognized status from fal.ai will result in
'failed'rather than continuing to poll indefinitely.Consider adding an edge case test for
FAILEDwithout an error message to ensure graceful handling:📝 Optional additional test case
it('returns failed status without error when error field is absent', async () => { mockQueueStatus.mockResolvedValueOnce({ status: 'FAILED', }) const adapter = createAdapter() const result = await adapter.getVideoStatus('job-failed-no-error') expect(result.status).toBe('failed') expect(result.error).toBeUndefined() })🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@packages/typescript/ai-fal/tests/video-adapter.test.ts` around lines 217 - 227, Add a test that ensures the adapter maps a fal.ai response with status 'FAILED' but no error field to { status: 'failed' } and does not set an error message: create a new it block similar to the existing unknown status test, use mockQueueStatus.mockResolvedValueOnce({ status: 'FAILED' }), call createAdapter() and await adapter.getVideoStatus('job-failed-no-error'), then assert result.status === 'failed' and that result.error is undefined; reference mockQueueStatus, createAdapter, and getVideoStatus to locate where to add the test.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In `@packages/typescript/ai-fal/src/adapters/video.ts`:
- Around line 19-26: Update the FalQueueStatus type to only include 'IN_QUEUE' |
'IN_PROGRESS' | 'COMPLETED' (remove 'FAILED') and ensure any failure detection
logic uses FalStatusResponse.error (i.e., check for status === 'COMPLETED' &&
error) rather than comparing to a non-existent 'FAILED' status; update the
FalStatusResponse type usage sites accordingly so callers handle
completed-with-error cases.
---
Nitpick comments:
In `@packages/typescript/ai-fal/tests/video-adapter.test.ts`:
- Around line 217-227: Add a test that ensures the adapter maps a fal.ai
response with status 'FAILED' but no error field to { status: 'failed' } and
does not set an error message: create a new it block similar to the existing
unknown status test, use mockQueueStatus.mockResolvedValueOnce({ status:
'FAILED' }), call createAdapter() and await
adapter.getVideoStatus('job-failed-no-error'), then assert result.status ===
'failed' and that result.error is undefined; reference mockQueueStatus,
createAdapter, and getVideoStatus to locate where to add the test.
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.changeset/fix-fal-failed-status.mdpackages/typescript/ai-fal/package.jsonpackages/typescript/ai-fal/src/adapters/video.tspackages/typescript/ai-fal/tests/video-adapter.test.ts
fal.ai never returns a FAILED queue status — invalid jobs go through IN_PROGRESS → COMPLETED, and the real error (e.g. 422 validation) only surfaces when calling fal.queue.result(). This extracts detailed error info from the result fetch, removes the fictional FAILED status handling, and returns failed status from getVideoJobStatus when the result fetch throws. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
tombeckenham
changed the title
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
AlemTuzlak
approved these changes
Mar 23, 2026
…pped-to-processing-causes-infinite-polling
AlemTuzlak
approved these changes
Mar 30, 2026
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Summary
FAILEDqueue status — invalid jobs goIN_PROGRESS→COMPLETED, and the real error (e.g. 422 validation) only surfaces when callingfal.queue.result()getVideoUrl()now catches result fetch errors and extracts detailed validation messages fromerror.body.detailFAILEDqueue status handling (fal doesn't use it)getVideoJobStatus()now returnsstatus: 'failed'when the result fetch throws on a "completed" job'processing'(safe for polling) instead of'failed'Closes #394
Test plan
getVideoUrl()'processing'🤖 Generated with Claude Code
Summary by CodeRabbit