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asyncio: New error handling API. Issue #20681.

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This commit is contained in:
Yury Selivanov 2014-02-18 18:02:19 -05:00
parent 6acc5e1330
commit 569efa2e4b
15 changed files with 491 additions and 99 deletions
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22
Lib/asyncio/futures.py
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@ -83,9 +83,10 @@ class _TracebackLogger:
in a discussion about closing files when they are collected.
"""
__slots__ = ['exc', 'tb']
__slots__ = ['exc', 'tb', 'loop']
def __init__(self, exc):
def __init__(self, exc, loop):
self.loop = loop
self.exc = exc
self.tb = None
@ -102,8 +103,11 @@ class _TracebackLogger:
def __del__(self):
if self.tb:
logger.error('Future/Task exception was never retrieved:\n%s',
''.join(self.tb))
msg = 'Future/Task exception was never retrieved:\n{tb}'
context = {
'message': msg.format(tb=''.join(self.tb)),
}
self.loop.call_exception_handler(context)
class Future:
@ -173,8 +177,12 @@ class Future:
# has consumed the exception
return
exc = self._exception
logger.error('Future/Task exception was never retrieved:',
exc_info=(exc.__class__, exc, exc.__traceback__))
context = {
'message': 'Future/Task exception was never retrieved',
'exception': exc,
'future': self,
}
self._loop.call_exception_handler(context)
def cancel(self):
"""Cancel the future and schedule callbacks.
@ -309,7 +317,7 @@ class Future:
if _PY34:
self._log_traceback = True
else:
self._tb_logger = _TracebackLogger(exception)
self._tb_logger = _TracebackLogger(exception, self._loop)
# Arrange for the logger to be activated after all callbacks
# have had a chance to call result() or exception().
self._loop.call_soon(self._tb_logger.activate)