gen.with_timeout: Don't log CancelledError after timeout#2681
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python/cpython#13528 broke us in two ways: asyncio.CancelledError is no longer an alias for concurrent.futures.CancelledError and it's now a BaseException. Fixes tornadoweb#2677 Closes tornadoweb#2681
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I'm not sure whether we want to automatically "quiet" CancelledErrors or not. We explicitly pass CancelledError as a quiet_exception here: Line 254 in c50aed0 I think as an immediate fix it's better to do something like #2683 to restore the old behavior. Maybe in the longer term we want something like this to always silence CancelledError. |
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On second thought (see discussion in #2683), I think this is what we want here. I'll merge this PR and then use that one to do a little more cleanup (removing the now-useless references to CancelledError in locks.py, re-enabling 3.8 CI) |
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Hello!
I'm not very familiar with Tornado, but I'm investigating the failure on Python 3.8 (#2677).
From commit a237a99, it seems that CancelledError should also be ignored in
tornado.gen.with_timeout'serror_callback. Is that right?This fixed tests on Python 3.8.0b1 for me.