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⚡️ Speed up function is_anyio_cancellation by 25% #2

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⚡️ Speed up function is_anyio_cancellation by 25% #2

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17 changes: 9 additions & 8 deletions src/anyio/_backends/_asyncio.py
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Original file line number Diff line number Diff line change
Expand Up @@ -375,19 +375,20 @@ def is_anyio_cancellation(exc: CancelledError) -> bool:
# Sometimes third party frameworks catch a CancelledError and raise a new one, so as
# a workaround we have to look at the previous ones in __context__ too for a
# matching cancel message
current = exc
while True:
args = current.args
if (
exc.args
and isinstance(exc.args[0], str)
and exc.args[0].startswith("Cancelled via cancel scope ")
args
and isinstance(args[0], str)
and args[0].startswith("Cancelled via cancel scope ")
):
return True

if isinstance(exc.__context__, CancelledError):
exc = exc.__context__
continue

return False
context = current.__context__
if not isinstance(context, CancelledError):
return False
current = context


class CancelScope(BaseCancelScope):
Expand Down