[tahoe-dev] [tahoe-lafs] #1154: mplayer triggers two bugs in Tahoe's new downloader

[tahoe-lafs]

#1154: mplayer triggers two bugs in Tahoe's new downloader
----------------------+-----------------------------------------------------
 Reporter:  francois  |           Owner:  warner   
     Type:  defect    |          Status:  new      
 Priority:  major     |       Milestone:  undecided
Component:  code      |         Version:  n/a      
 Keywords:            |   Launchpad Bug:           
----------------------+-----------------------------------------------------
 I tried to play a movie hosted on a Tahoe-LAFS grid with 'mplayer
 http://127.0.0.1:3456/file/URI-blah/@@named=/test.avi'. The error seems to
 be related to mplayer seeking at the end of the file for downloading the
 AVI index before seeking back to the beginning for the actual rendering.

 Preventing mplayer from reading the index with the '--noidx' parameter
 doesn't not trigger this error.

 {{{
 2010-08-03 20:06:40+0200 [-] Unhandled Error
         Traceback (most recent call last):
           File "/usr/lib/python2.6/dist-
 packages/twisted/application/app.py", line 348, in runReactorWithLogging
             reactor.run()
           File "/usr/lib/python2.6/dist-
 packages/twisted/internet/base.py", line 1170, in run
             self.mainLoop()
           File "/usr/lib/python2.6/dist-
 packages/twisted/internet/base.py", line 1179, in mainLoop
             self.runUntilCurrent()
           File "/usr/lib/python2.6/dist-
 packages/twisted/internet/base.py", line 778, in runUntilCurrent
             call.func(*call.args, **call.kw)
         --- <exception caught here> ---
           File "/usr/lib/pymodules/python2.6/foolscap/eventual.py", line
 26, in _turn
             cb(*args, **kwargs)
           File "/home/francois/dev/tahoe-lafs-
 ticket798-1.7.1-r4653/src/allmydata/immutable/downloader/share.py", line
 197, in loop
             self._do_loop()
           File "/home/francois/dev/tahoe-lafs-
 ticket798-1.7.1-r4653/src/allmydata/immutable/downloader/share.py", line
 253, in _do_loop
             wanted, needed = self._desire()
           File "/home/francois/dev/tahoe-lafs-
 ticket798-1.7.1-r4653/src/allmydata/immutable/downloader/share.py", line
 611, in _desire
             % (want_it.dump(), need_it.dump(),
 gotta_gotta_have_it.dump()))
           File "/home/francois/dev/tahoe-lafs-
 ticket798-1.7.1-r4653/src/allmydata/util/spans.py", line 143, in dump
             return "len=%d: %s" % (len(self),
         exceptions.TypeError: __len__() should return an int
 }}}


 {{{
 2010-08-03 20:06:51+0200 [HTTPChannel,198,127.0.0.1] Unhandled Error
         Traceback (most recent call last):
           File "/usr/lib/python2.6/dist-
 packages/twisted/application/app.py", line 348, in runReactorWithLogging
             reactor.run()
           File "/usr/lib/python2.6/dist-
 packages/twisted/internet/base.py", line 1170, in run
             self.mainLoop()
           File "/usr/lib/python2.6/dist-
 packages/twisted/internet/base.py", line 1182, in mainLoop
             self.doIteration(t)
           File "/usr/lib/python2.6/dist-
 packages/twisted/internet/selectreactor.py", line 140, in doSelect
             _logrun(selectable, _drdw, selectable, method, dict)
         --- <exception caught here> ---
           File "/usr/lib/python2.6/dist-packages/twisted/python/log.py",
 line 84, in callWithLogger
             return callWithContext({"system": lp}, func, *args, **kw)
           File "/usr/lib/python2.6/dist-packages/twisted/python/log.py",
 line 69, in callWithContext
             return context.call({ILogContext: newCtx}, func, *args, **kw)
           File "/usr/lib/python2.6/dist-
 packages/twisted/python/context.py", line 59, in callWithContext
             return self.currentContext().callWithContext(ctx, func, *args,
 **kw)
           File "/usr/lib/python2.6/dist-
 packages/twisted/python/context.py", line 37, in callWithContext
             return func(*args,**kw)
           File "/usr/lib/python2.6/dist-
 packages/twisted/internet/selectreactor.py", line 156, in _doReadOrWrite
             self._disconnectSelectable(selectable, why, method=="doRead")
           File "/usr/lib/python2.6/dist-
 packages/twisted/internet/posixbase.py", line 191, in
 _disconnectSelectable
             selectable.readConnectionLost(f)
           File "/usr/lib/python2.6/dist-packages/twisted/internet/tcp.py",
 line 508, in readConnectionLost
             self.connectionLost(reason)
           File "/usr/lib/python2.6/dist-packages/twisted/internet/tcp.py",
 line 513, in connectionLost
             abstract.FileDescriptor.connectionLost(self, reason)
           File "/usr/lib/python2.6/dist-
 packages/twisted/internet/abstract.py", line 64, in connectionLost
             self.producer.stopProducing()
           File "/home/francois/dev/tahoe-lafs-
 ticket798-1.7.1-r4653/src/allmydata/immutable/downloader/segmentation.py",
 line 146, in stopProducing
             self._cancel_segment_request.cancel()
           File "/home/francois/dev/tahoe-lafs-
 ticket798-1.7.1-r4653/src/allmydata/immutable/downloader/node.py", line
 27, in cancel
             self._f(self)
           File "/home/francois/dev/tahoe-lafs-
 ticket798-1.7.1-r4653/src/allmydata/immutable/downloader/node.py", line
 468, in _cancel_request
             if self._active_segment.segnum not in segnums:
         exceptions.AttributeError: 'NoneType' object has no attribute
 'segnum'
 }}}

-- 
Ticket URL: <http://tahoe-lafs.org/trac/tahoe-lafs/ticket/1154>
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