Check state in shutdown for handling uvloop double kill

[ahopkins]

Closes #2948

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.811%. Comparing base (a64dc64) to head (34b9ac3).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
sanic/server/runners.py	52.173%	11 Missing ⚠️
sanic/worker/process.py	40.000%	3 Missing ⚠️
sanic/mixins/startup.py	50.000%	2 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #3122       +/-   ##
=============================================
- Coverage   87.957%   87.811%   -0.146%     
=============================================
  Files          105       105               
  Lines         8113      8139       +26     
  Branches      1287      1290        +3     
=============================================
+ Hits          7136      7147       +11     
- Misses         671       686       +15     
  Partials       306       306               

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[Copilot]

Pull request overview

This PR addresses issue #2948 by adding robust error handling for connection failures during worker shutdown, particularly when processes are terminated rapidly (double kill scenario with uvloop).

Key changes:

• Added exception handling for multiprocess connection errors (BrokenPipeError, ConnectionResetError, EOFError) across worker state operations
• Introduced _run_shutdown_coro() function to handle event loop state issues during shutdown, with special handling for uvloop's behavior where the first run_until_complete() after loop.stop() may fail
• Added signal handler cleanup before shutdown to prevent issues during the shutdown sequence

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 7 comments.

File	Description
sanic/worker/process.py	Extended exception handling in exit() to catch additional connection errors (BrokenPipeError, ConnectionResetError, EOFError); wrapped set_state() call in terminate() with similar exception handling to prevent crashes when monitor process has exited
sanic/server/runners.py	Added _run_shutdown_coro() helper function to handle running shutdown coroutines when loop has been stopped; added signal handler removal before shutdown; wrapped app.set_serving(False) with exception handling for connection errors
sanic/mixins/startup.py	Wrapped _get_process_states() method with exception handling to gracefully return empty list when shared state connection fails

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