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Improve crashes if messenger APIs are used incorrectly #39041

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merged 2 commits into from Jan 24, 2023

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@loic-sharma loic-sharma commented Jan 21, 2023

The previous MethodCall documentation made it seem like you must unregister handlers. This is not necessary during engine shutdown as that causes a crash after #36909. This attempts to improve the comments & crashes for clarity.

See the conversation in #38941

New crash messages:

[FATAL:flutter/shell/platform/windows/flutter_windows.cc(301)] Check failed: FlutterDesktopMessengerIsAvailable(messenger). Messenger must reference a running engine to set a callback
[FATAL:flutter/shell/platform/windows/flutter_windows.cc(268)] Check failed: FlutterDesktopMessengerIsAvailable(messenger). Messenger must reference a running engine to send a message

Addresses flutter/flutter#118611

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  • I read the Contributor Guide and followed the process outlined there for submitting PRs.
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  • I listed at least one issue that this PR fixes in the description above.
  • I added new tests to check the change I am making or feature I am adding, or Hixie said the PR is test-exempt. See testing the engine for instructions on writing and running engine tests.
  • I updated/added relevant documentation (doc comments with ///).
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  • All existing and new tests are passing.

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It looks like this pull request may not have tests. Please make sure to add tests before merging. If you need an exemption to this rule, contact Hixie on the #hackers channel in Chat (don't just cc him here, he won't see it! He's on Discord!).

If you are not sure if you need tests, consider this rule of thumb: the purpose of a test is to make sure someone doesn't accidentally revert the fix. Ask yourself, is there anything in your PR that you feel it is important we not accidentally revert back to how it was before your fix?

Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing.

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@yaakovschectman yaakovschectman left a comment

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LGTM

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@cbracken cbracken left a comment

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Looks great - thanks for making these easier to diagnose.

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Hixie commented Jan 24, 2023

test-exempt: no semantic change (improves error messages and documentation)

@loic-sharma loic-sharma added the autosubmit Merge PR when tree becomes green via auto submit App label Jan 24, 2023
@auto-submit auto-submit bot merged commit 4165d4b into flutter:main Jan 24, 2023
engine-flutter-autoroll added a commit to engine-flutter-autoroll/flutter that referenced this pull request Jan 25, 2023
auto-submit bot pushed a commit to flutter/flutter that referenced this pull request Jan 25, 2023
…119093)

* 4165d4b9b Improve crashes if messenger APIs are used incorrectly (flutter/engine#39041)

* bec40654a Roll Fuchsia Linux SDK from dWbkAZchFHtZE9Wt_... to E9m-Gk382PkB7_Nbp... (flutter/engine#39107)
ricardoamador pushed a commit to ricardoamador/engine that referenced this pull request Jan 25, 2023
@loic-sharma loic-sharma deleted the desktop-messenger-assert branch January 25, 2023 18:21
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