mplayer triggers two bugs in Tahoe's new downloader

[francois]

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'