** Branch linked: lp:~exarkun/divmod.org/pop3-timeouts
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https://bugs.launchpad.net/bugs/998044
Title:
On connection timeout, POP3 grabber fails with an unhandled
AttributeError
Status in Multi-protocol messaging server and tools:
New
Bug description:
This traceback shows up in my logs sometimes:
2012-05-10 14:40:57-0400 [ControlledPOP3GrabberProtocol
(BandwidthMeasuringProtocol) (TLSMemoryBIOProtocol),client] Unhandled Error
Traceback (most recent call last):
File
"/home/quotient/.local/lib/python2.7/site-packages/epsilon/hotfixes/deferredgenerator_tfailure.py",
line 44, in gotResult
_deferGenerator(g, deferred)
File
"/home/quotient/.local/lib/python2.7/site-packages/epsilon/hotfixes/deferredgenerator_tfailure.py",
line 25, in _deferGenerator
deferred.errback()
File
"/home/quotient/.local/lib/python2.7/site-packages/Twisted-11.1.0-py2.7-linux-x86_64.egg/twisted/internet/defer.py",
line 391, in errback
self._startRunCallbacks(fail)
File
"/home/quotient/.local/lib/python2.7/site-packages/Twisted-11.1.0-py2.7-linux-x86_64.egg/twisted/internet/defer.py",
line 458, in _start File
"/home/quotient/.local/lib/python2.7/site-packages/Twisted-11.1.0-py2.7-linux-x86_64.egg/twisted/internet/defer.py",
line 458, in _start
RunCallbacks
self._runCallbacks()
File
"/home/quotient/.local/lib/python2.7/site-packages/Twisted-11.1.0-py2.7-linux-x86_64.egg/twisted/internet/defer.py",
line 545, in _runCa
llbacks
current.result = callback(current.result, *args, **kw)
File
"/home/quotient/.local/lib/python2.7/site-packages/epsilon/hotfixes/deferredgenerator_tfailure.py",
line 44, in gotResult
_deferGenerator(g, deferred)
--- <exception caught here> ---
File
"/home/quotient/.local/lib/python2.7/site-packages/epsilon/hotfixes/deferredgenerator_tfailure.py",
line 20, in _deferGenerator
result = g.next()
File
"/home/quotient/.local/lib/python2.7/site-packages/xquotient/grabber.py", line
501, in _grab
self.setStatus(u"Connection lost", False)
File
"/home/quotient/.local/lib/python2.7/site-packages/xquotient/grabber.py", line
596, in setStatus
self._transact(self.grabber.status.setStatus, msg, success)
exceptions.AttributeError: 'NoneType' object has no attribute 'status'
Looking at the code, it seems the likely explanation is that the connection
times out (a frequent occurrence on my net connection/server).
`timeoutConnection` calls `stoppedRunning`. `stoppedRunning` sets
`self.grabber` to `None` (a recent improvement, as previously it would choke on
a scheduler problem before getting there, now fixed). `timeoutConnection` then
calls `loseConnection` which eventually causes the connection to be lost,
resulting in `connectionLost`, causing one of the Deferreds waited on in
`_grab` to fail. This leads to a `setStatus` call which fails because the
`grabber` attribute was discarded already.
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