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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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18
Lib/asyncio/events.py
View file

@ -11,6 +11,7 @@ __all__ = ['AbstractEventLoopPolicy',
import functools
import inspect
import subprocess
import traceback
import threading
import socket
import sys
@ -66,7 +67,8 @@ def _format_callback(func, args, suffix=''):
class Handle:
"""Object returned by callback registration methods."""
__slots__ = ['_callback', '_args', '_cancelled', '_loop', '__weakref__']
__slots__ = ('_callback', '_args', '_cancelled', '_loop',
'_source_traceback', '__weakref__')
def __init__(self, callback, args, loop):
assert not isinstance(callback, Handle), 'A Handle is not a callback'
@ -74,6 +76,10 @@ class Handle:
self._callback = callback
self._args = args
self._cancelled = False
if self._loop.get_debug():
self._source_traceback = traceback.extract_stack(sys._getframe(1))
else:
self._source_traceback = None
def __repr__(self):
info = []
@ -91,11 +97,14 @@ class Handle:
except Exception as exc:
cb = _format_callback(self._callback, self._args)
msg = 'Exception in callback {}'.format(cb)
self._loop.call_exception_handler({
context = {
'message': msg,
'exception': exc,
'handle': self,
})
}
if self._source_traceback:
context['source_traceback'] = self._source_traceback
self._loop.call_exception_handler(context)
self = None # Needed to break cycles when an exception occurs.
@ -107,7 +116,8 @@ class TimerHandle(Handle):
def __init__(self, when, callback, args, loop):
assert when is not None
super().__init__(callback, args, loop)
if self._source_traceback:
del self._source_traceback[-1]
self._when = when
def __repr__(self):