[Twisted-Python] Twisted 11.0 and Foolscap incompatibility

Bill Noon wn10 at cornell.edu
Tue Apr 5 15:03:59 EDT 2011


It looks like the new ssl/tls code doesn't work with Foolscap.  The ConnectionMixin is treating the self.protocol
object as a transport and calls write() and loseConnection() on it.

Here is a traceback:
	Traceback (most recent call last):
	  File "/usr/lib64/python2.6/site-packages/foolscap-0.6.1_-py2.6.egg/foolscap/slicers/root.py", line 107, in send
	    d.callback(None)
	  File "/usr/lib64/python2.6/site-packages/Twisted-11.0.0_r31548-py2.6-linux-x86_64.egg/twisted/internet/defer.py", line 361, in callback
	    self._startRunCallbacks(result)
	  File "/usr/lib64/python2.6/site-packages/Twisted-11.0.0_r31548-py2.6-linux-x86_64.egg/twisted/internet/defer.py", line 455, in _startRunCallbacks
	    self._runCallbacks()
	  File "/usr/lib64/python2.6/site-packages/Twisted-11.0.0_r31548-py2.6-linux-x86_64.egg/twisted/internet/defer.py", line 542, in _runCallbacks
	    current.result = callback(current.result, *args, **kw)
	--- <exception caught here> ---
	  File "/usr/lib64/python2.6/site-packages/foolscap-0.6.1_-py2.6.egg/foolscap/banana.py", line 216, in produce
	    self.pushSlicer(slicer, obj)
	  File "/usr/lib64/python2.6/site-packages/foolscap-0.6.1_-py2.6.egg/foolscap/banana.py", line 352, in pushSlicer
	    openID = self.sendOpen()
	  File "/usr/lib64/python2.6/site-packages/foolscap-0.6.1_-py2.6.egg/foolscap/banana.py", line 481, in sendOpen
	    int2b128(openID, self.transport.write)
	  File "/usr/lib64/python2.6/site-packages/foolscap-0.6.1_-py2.6.egg/foolscap/banana.py", line 24, in int2b128
	    stream(chr(0))
	  File "/usr/lib64/python2.6/site-packages/Twisted-11.0.0_r31548-py2.6-linux-x86_64.egg/twisted/internet/_newtls.py", line 176, in write
	    self.protocol.write(bytes)
	exceptions.AttributeError: 'Broker' object has no attribute 'write'
	

Any workarounds or suggestions?  Reverting to Twisted 10.2 works for now.

--Bill Noon
Northeast Regional Climate Center
Cornell University




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