gh-123720: When closing an asyncio server, stop the handlers #124689
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The only failing test is the check for a news blurb. Once I've got time for that I'll move forward. |
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I think this fix is incomplete. I believe the Lines 253 to 255 in ef06508 self.close_clients().
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Since 3.12, when server.wait_closed() was fixed, cancelling a serve_forever() call would wait for the last handler to exit, which may be never if it is waiting to read from a connection that is never closed by the client. To fix this, we insert a close_clients() call in the exit sequence (between close() and wait_closed()).
The repro shows that in 3.11 you need only a single ^C to stop the server; in 3.12 you need two. The fix indeed undoes that regression.
Some philosophical question remain:
Note that there's still a difference with 3.11: in 3.11, the handler receives a CancelledError; in main with this PR added, the handler receives an empty string, indicating that the connection was closed (by close_clients()). Maybe I should do something that actually cancels the handlers? I will look into the feasibility of this.