feat(storage)!: abort in-flight uploads and downloads via abortSignal - #1831
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feat(storage)!: abort in-flight uploads and downloads via abortSignal#1831spydon wants to merge 2 commits into
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Storage requests are built with an abortTrigger, so completing the Future<void> abortSignal passed to the upload and download methods aborts the transfer already on the wire and stops any remaining retries, the same shape as postgrest and functions. This replaces StorageRetryController, which only stopped the next retry attempt. Closes #1829 SDK-1824
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Included review availability: Your plan provides up to 4 included reviews per hour; 3 remain after this review. 📝 WalkthroughWalkthroughStorage replaces ChangesStorage abort signals
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant StorageFileApi
participant Fetch
participant HTTPRequest
StorageFileApi->>Fetch: pass abortSignal
Fetch->>HTTPRequest: attach abortTrigger
HTTPRequest-->>Fetch: throw RequestAbortedException
Fetch-->>StorageFileApi: return abort failure
Suggested reviewers: Merge Risk: ⚪ Minimal · up to Storage uploads and downloads now support cancellation without leaving retries running. No concrete unresolved merge risk remains. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In `@packages/supabase_storage/test/fetch_test.dart`:
- Around line 229-250: Update _handleMultipartRequest and its retry backoff so
abortSignal is observed during retry delays, raising RequestAbortedException
without starting another request when it completes. Add a deterministic test
using a long initialDelay that aborts during backoff and verifies the exception
occurs before the delay expires with exactly one request attempt.
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MIGRATION.mdpackages/supabase_storage/lib/src/fetch.dartpackages/supabase_storage/lib/src/storage_file_api.dartpackages/supabase_storage/lib/src/types.dartpackages/supabase_storage/lib/supabase_storage.dartpackages/supabase_storage/test/basic_test.dartpackages/supabase_storage/test/fetch_test.dartpackages/supabase_storage/test/types_test.dartsdk-compliance.yaml
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- packages/supabase_storage/test/types_test.dart
- packages/supabase_storage/lib/src/types.dart
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Sep 11, 2026
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🟡 Changes recommended
Cancellation during retry backoff can still start another upload attempt.
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Pull request overview
Adds real in-flight cancellation to Supabase Storage transfers using package:http abortable requests.
Changes:
- Adds
abortSignalto upload and download APIs. - Removes
StorageRetryControllerand documents migration. - Adds cancellation tests and compliance registration.
File summaries
| File | Description |
|---|---|
sdk-compliance.yaml |
Registers storage cancellation support. |
packages/supabase_storage/test/types_test.dart |
Removes retry-controller tests. |
packages/supabase_storage/test/fetch_test.dart |
Tests transfer cancellation. |
packages/supabase_storage/test/basic_test.dart |
Updates upload cancellation coverage. |
packages/supabase_storage/lib/supabase_storage.dart |
Exports the abort exception. |
packages/supabase_storage/lib/src/types.dart |
Removes the retry controller. |
packages/supabase_storage/lib/src/storage_file_api.dart |
Exposes and documents abort signals. |
packages/supabase_storage/lib/src/fetch.dart |
Uses abortable HTTP requests. |
MIGRATION.md |
Documents the breaking API migration. |
Review details
- Files reviewed: 9/9 changed files
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The shared retry helper races its delay against an optional abortSignal and never retries a RequestAbortedException, so an upload aborted while waiting for the next attempt fails at once instead of sending another request when the delay expires. Storage passes its signal through and its retry predicate drops the special case.
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Summary
Storage was the last package without real request cancellation. `StorageRetryController.cancel()` only stopped the next retry attempt, the attempt already on the wire kept transferring, and downloads had no cancellation surface at all.
This wires storage requests to `abortTrigger` in `package:http` and exposes a `Future? abortSignal` on every upload method and both download methods on `StorageFileApi`, the same shape as `PostgrestBuilder.abortSignal` and `FunctionsClient.invoke`.
Changes
Tests
Closes #1829
SDK-1824
Summary by CodeRabbit
New Features
RequestAbortedException.RequestAbortedExceptionis available through the storage library’s public API.Breaking Changes
StorageRetryController; use an optional abort signal instead.