Unhandled Twisted Error

[Patrick Santora]

I know this isn't the Twisted forum, but I've done some research and can't seem to find a good solution. So I'd thought I would try here.

Has anyone ran across these errors before while using Autobahn's websockets through Twisted? I'm using Python 2.7, twisted 13.2.0, and autobahn 0.8.8. The error basically kills any new connections that come through and forces me to have to restart the twisted service. Any help here would be appreciated. Maybe I should use gevent or something else rather than epoll?

2014-09-19 13:41:01-0400 [twisted.web.server.Site] Unhandled Error

Traceback (most recent call last):

 File "/home/ec2-user/local-python/lib/python2.7/site-packages/twisted/python/log.py", line 73, in callWithContext

   return context.call({ILogContext: newCtx}, func, *args, **kw)

 File "/home/ec2-user/local-python/lib/python2.7/site-packages/twisted/python/context.py", line 118, in callWithContext

   return self.currentContext().callWithContext(ctx, func, *args, **kw)

 File "/home/ec2-user/local-python/lib/python2.7/site-packages/twisted/python/context.py", line 81, in callWithContext

   return func(*args,**kw)

 File "/home/ec2-user/local-python/lib/python2.7/site-packages/twisted/internet/posixbase.py", line 614, in _doReadOrWrite

   why = selectable.doRead()

--- <exception caught here> ---

 File "/home/ec2-user/local-python/lib/python2.7/site-packages/twisted/internet/tcp.py", line 1069, in doRead

   transport = self.transport(skt, protocol, addr, self, s, self.reactor)

 File "/home/ec2-user/local-python/lib/python2.7/site-packages/twisted/internet/tcp.py", line 786, in __init__

   self.startReading()

 File "/home/ec2-user/local-python/lib/python2.7/site-packages/twisted/internet/abstract.py", line 434, in startReading

   self.reactor.addReader(self)

 File "/home/ec2-user/local-python/lib/python2.7/site-packages/twisted/internet/epollreactor.py", line 271, in addReader

   EPOLLIN, EPOLLOUT)

 File "/home/ec2-user/local-python/lib/python2.7/site-packages/twisted/internet/epollreactor.py", line 255, in _add

   self._poller.modify(fd, flags)

exceptions.IOError: [Errno 2] No such file or directory

2014-09-19 16:53:31-0400 [HTTPChannel,226,192.168.135.156] Unhandled Error

Traceback (most recent call last):

 File "/home/ec2-user/local-python/lib/python2.7/site-packages/twisted/python/log.py", line 88, in callWithLogger

   return callWithContext({"system": lp}, func, *args, **kw)

 File "/home/ec2-user/local-python/lib/python2.7/site-packages/twisted/python/log.py", line 73, in callWithContext

   return context.call({ILogContext: newCtx}, func, *args, **kw)

 File "/home/ec2-user/local-python/lib/python2.7/site-packages/twisted/python/context.py", line 118, in callWithContext

   return self.currentContext().callWithContext(ctx, func, *args, **kw)

 File "/home/ec2-user/local-python/lib/python2.7/site-packages/twisted/python/context.py", line 81, in callWithContext

   return func(*args,**kw)

--- <exception caught here> ---

 File "/home/ec2-user/local-python/lib/python2.7/site-packages/twisted/internet/posixbase.py", line 614, in _doReadOrWrite

   why = selectable.doRead()

 File "/home/ec2-user/local-python/lib/python2.7/site-packages/twisted/internet/tcp.py", line 215, in doRead

   return self._dataReceived(data)

 File "/home/ec2-user/local-python/lib/python2.7/site-packages/twisted/internet/tcp.py", line 221, in _dataReceived

   rval = self.protocol.dataReceived(data)

 File "/home/ec2-user/local-python/lib/python2.7/site-packages/autobahn/twisted/websocket.py", line 88, in dataReceived

   self._dataReceived(data)

 File "/home/ec2-user/local-python/lib/python2.7/site-packages/autobahn/websocket/protocol.py", line 1265, in _dataReceived

   self.consumeData()

 File "/home/ec2-user/local-python/lib/python2.7/site-packages/autobahn/websocket/protocol.py", line 1281, in consumeData

   while self.processData() and self.state != WebSocketProtocol.STATE_CLOSED:

 File "/home/ec2-user/local-python/lib/python2.7/site-packages/autobahn/websocket/protocol.py", line 1440, in processData

   return self.processDataHybi()

 File "/home/ec2-user/local-python/lib/python2.7/site-packages/autobahn/websocket/protocol.py", line 1753, in processDataHybi

   fr = self.onFrameEnd()

 File "/home/ec2-user/local-python/lib/python2.7/site-packages/autobahn/websocket/protocol.py", line 1853, in onFrameEnd

   self.processControlFrame()

 File "/home/ec2-user/local-python/lib/python2.7/site-packages/autobahn/websocket/protocol.py", line 1910, in processControlFrame

   if self.onCloseFrame(code, reasonRaw):

 File "/home/ec2-user/local-python/lib/python2.7/site-packages/autobahn/websocket/protocol.py", line 853, in onCloseFrame

   self.sendCloseFrame(code = WebSocketProtocol.CLOSE_STATUS_CODE_NORMAL, isReply = True)

 File "/home/ec2-user/local-python/lib/python2.7/site-packages/autobahn/websocket/protocol.py", line 2096, in sendCloseFrame

   self.sendFrame(opcode = 8, payload = payload)

 File "/home/ec2-user/local-python/lib/python2.7/site-packages/autobahn/websocket/protocol.py", line 2025, in sendFrame

   self.sendData(raw, sync, chopsize)

 File "/home/ec2-user/local-python/lib/python2.7/site-packages/autobahn/websocket/protocol.py", line 1406, in sendData

   self.transport.write(data)

 File "/home/ec2-user/local-python/lib/python2.7/site-packages/twisted/internet/abstract.py", line 355, in write

   self.startWriting()

 File "/home/ec2-user/local-python/lib/python2.7/site-packages/twisted/internet/abstract.py", line 442, in startWriting

   self.reactor.addWriter(self)

 File "/home/ec2-user/local-python/lib/python2.7/site-packages/twisted/internet/epollreactor.py", line 288, in addWriter

   EPOLLOUT, EPOLLIN)

 File "/home/ec2-user/local-python/lib/python2.7/site-packages/twisted/internet/epollreactor.py", line 257, in _add

   self._poller.register(fd, flags)

exceptions.IOError: [Errno 17] File exists

[Patrick Santora]

After doing some additional scanning I found a post that talked about using the select reactor rather than epoll. I'm going to try that. If anyone has any further advice here please feel free to share.

[Tobias Oberstein]

Am 19.09.2014 23:12, schrieb Patrick Santora:
> I know this isn't the Twisted forum, but I've done some research and
> can't seem to find a good solution. So I'd thought I would try here.

Twisted also has a mailing list;)

Skimming over the error log below, this looks like a low-level
networking issue. E.g. the process running out of memory or file
descriptors.

I guess this is on a Linux machine, in which case you can also try
different reactors (select, poll, epoll)

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[Francesco Ballarini]

Hi Patrick,

did you solve that error?

'couse today i've see in my logs the same situation


Thank You