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asyncio, Tulip issue 137: In debug mode, save traceback where Future, Task and

Browse source 
Handle objects are created. Pass the traceback to call_exception_handler() in
the 'source_traceback' key.

The traceback is truncated to hide internal calls in asyncio, show only the
traceback from user code.

Add tests for the new source_traceback, and a test for the 'Future/Task
exception was never retrieved' log.
This commit is contained in:
Victor Stinner 2014-06-27 13:52:20 +02:00
parent bbd96c6f47
commit 80f53aa9a0
8 changed files with 180 additions and 26 deletions
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14
Lib/asyncio/tasks.py
View file

@ -195,6 +195,8 @@ class Task(futures.Future):
def __init__(self, coro, *, loop=None):
assert iscoroutine(coro), repr(coro) # Not a coroutine function!
super().__init__(loop=loop)
if self._source_traceback:
del self._source_traceback[-1]
self._coro = iter(coro) # Use the iterator just in case.
self._fut_waiter = None
self._must_cancel = False
@ -207,10 +209,13 @@ class Task(futures.Future):
if _PY34:
def __del__(self):
if self._state == futures._PENDING:
self._loop.call_exception_handler({
context = {
'task': self,
'message': 'Task was destroyed but it is pending!',
})
}
if self._source_traceback:
context['source_traceback'] = self._source_traceback
self._loop.call_exception_handler(context)
futures.Future.__del__(self)
def __repr__(self):
@ -620,7 +625,10 @@ def async(coro_or_future, *, loop=None):
raise ValueError('loop argument must agree with Future')
return coro_or_future
elif iscoroutine(coro_or_future):
return Task(coro_or_future, loop=loop)
task = Task(coro_or_future, loop=loop)
if task._source_traceback:
del task._source_traceback[-1]
return task
else:
raise TypeError('A Future or coroutine is required')