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fix: wait for in progress requests to cancel before completing .pause() and .cancel() #4844

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merged 3 commits into from May 13, 2024

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Jordan-Nelson
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@Jordan-Nelson Jordan-Nelson commented May 7, 2024

Description of changes:

  • wait for in progress requests to cancel before completing .pause() and .cancel().
  • add tests for multiple files sizes for pause/resume/cancel
  • skip .cancel() tests for download. These are failing on flutter beta and it is not immediately obvious why. Further investigation is required.

The main change in this PR is to wait to complete the .pause() and .cancel() futures until in flight requests have been cancelled. There are a few motivations for this:

  1. This resolved e2e test failures on Flutter beta. The cancelled networks requests which were completing after .pause() and .cancel() return are resulting in errors being thrown after tests complete. As of Flutter 3.22 these will result in test failures.
  2. When a multi part upload is paused or canceled, any in progress requests are cancelled. When the request is cancelled, there is also a request to S3 to abort the multi part upload, which results in S3 discarding any previously uploaded chunks and preventing new chunks from being uploaded. S3 states that any requests that are currently in progress when the abort request is made may complete successfully. Since we currently we do not wait for the in progress requests to cancel before aborting the upload, those requests could still be uploaded to S3 resulting in additional cost.
  3. Given .pause() and .cancel() return futures, it is reasonable to expect that the operation is fully paused/cancelled when the future completes, but this isn't currently the case as there are network requests that are cancelled after the future returns.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

@Jordan-Nelson Jordan-Nelson force-pushed the chore/storage-e2e-flutter-beta branch 2 times, most recently from d3a9dde to 16fe12b Compare May 8, 2024 22:33
@Jordan-Nelson Jordan-Nelson changed the title chore: fix storage e2e flutter beta fix: wait for in progress multi part uploads to cancel for .pause() and .cancel() May 8, 2024
@Jordan-Nelson Jordan-Nelson changed the title fix: wait for in progress multi part uploads to cancel for .pause() and .cancel() fix: wait for in progress requests to cancel before completing .pause() and .cancel() May 8, 2024
@Jordan-Nelson Jordan-Nelson force-pushed the chore/storage-e2e-flutter-beta branch 3 times, most recently from ee4fc5b to a8d4f83 Compare May 9, 2024 17:20
@Jordan-Nelson Jordan-Nelson force-pushed the chore/storage-e2e-flutter-beta branch from a8d4f83 to cf93cde Compare May 9, 2024 17:53
@Jordan-Nelson Jordan-Nelson marked this pull request as ready for review May 9, 2024 17:55
@Jordan-Nelson Jordan-Nelson requested a review from a team as a code owner May 9, 2024 17:55
Comment on lines +357 to +359
testWidgets('can cancel (file size: $fileSize mb)', (_) async {
final fileId = uuid();
final path = 'public/upload-file-cancel-$fileId';
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should this also be checking if the file size is 5mb like pause test since small file uploads can't be canceled??

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Cancel is supported for both single part and multi part uploads. Only resume/pause are not supported for single part uploads

@Jordan-Nelson Jordan-Nelson merged commit 8576d44 into main May 13, 2024
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@Jordan-Nelson Jordan-Nelson deleted the chore/storage-e2e-flutter-beta branch May 13, 2024 18:41
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3 participants