Question

好的我一直在编写一个代理来接受http GET请求并将它们转换为HTTP POST请求（因为许多用于python的媒体播放器只支持GET）。所以我知道正在努力缓存那些结果，我只下载一次url，我将很多代码从超类移动到子类并更改它，以便我可以将相同的东西发送到多个服务器连接（例如，如果我建立了一个服务器连接，如果可以的话，它会将它附加到下载实例上）。

无论如何，除了最后一部分之外，由于某种原因，在我调用lostConnection之前将http通道设置为None（这没有任何错误，如互联网出去等），它最常工作，这会导致一个无对象的错误我没有调用lostConnection的属性传输。

这是代码

    self.connectionDone = True
    print self.producers
    for p in self.producers:
        print p
        print p.channel
        print dir(p)
        p.channel.transport.loseConnection()

    self.transport.loseConnection()

并且self.channel的回溯设置为none（每个 setattr 调用的回溯模块的print_stack）

注意：看看最后几行，我认为这就是问题所在。

   File "Sharky.py", line 581, in <module>
     reactor.run()
   File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\internet\wxreactor.py", line 145, in run
     self.wxapp.MainLoop()
   File "C:\Program Files\Python 2.6.2\lib\site-packages\wx-2.8-msw-unicode\wx\_core.py", line 8007, in MainLoop
     wx.PyApp.MainLoop(self)
   File "C:\Program Files\Python 2.6.2\lib\site-packages\wx-2.8-msw-unicode\wx\_core.py", line 7303, in MainLoop
     return _core_.PyApp_MainLoop(*args, **kwargs)
   File "C:\Program Files\Python 2.6.2\lib\site-packages\wx-2.8-msw-unicode\wx\_core.py", line 14640, in <lambda>
     lambda event: event.callable(*event.args, **event.kw) )
   File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\internet\_threadedselect.py", line 243, in _interleave
     getattr(self, '_process_' + msg)(*args)
   File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\internet\_threadedselect.py", line 209, in _process_Notify
     _logrun(selectable, _drdw, selectable, method, dct)
   File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\python\log.py", line 84, in callWithLogger
     return callWithContext({"system": lp}, func, *args, **kw)
   File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\python\log.py", line 69, in callWithContext
     return context.call({ILogContext: newCtx}, func, *args, **kw)
   File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\python\context.py", line 59, in callWithContext
     return self.currentContext().callWithContext(ctx, func, *args, **kw)
   File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\python\context.py", line 37, in callWithContext
     return func(*args,**kw)
   File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\internet\_threadedselect.py", line 303, in _doReadOrWrite
     self._disconnectSelectable(selectable, why, method == "doRead")
   File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\internet\posixbase.py", line 253, in _disconnectSelectable
     selectable.connectionLost(f)
   File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\internet\tcp.py", line 519, in connectionLost
     protocol.connectionLost(reason)
   File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\web\http.py", line 1725, in connectionLost
     request.connectionLost(reason)
   File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\web\http.py", line 1287, in connectionLost
     self.channel = None
   File "C:\Documents and Settings\Admin\My Documents\Mercurial\sharky\ProxyServer.py", line 172, in __setattr__
     traceback.print_stack()

这是我得到的无属性异常

Traceback (most recent call last):
  File "C:\Program Files\Python 2.6.2\lib\site-packages\wx-2.8-msw-unicode\wx\_core.py", line 7303, in MainLoop
    return _core_.PyApp_MainLoop(*args, **kwargs)
  File "C:\Program Files\Python 2.6.2\lib\site-packages\wx-2.8-msw-unicode\wx\_core.py", line 14640, in <lambda>
    lambda event: event.callable(*event.args, **event.kw) )
  File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\internet\_threadedselect.py", line 243, in _interleave
    getattr(self, '_process_' + msg)(*args)
  File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\internet\_threadedselect.py", line 209, in _process_Notify
    _logrun(selectable, _drdw, selectable, method, dct)
--- <exception caught here> ---
  File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\python\log.py", line 84, in callWithLogger
    return callWithContext({"system": lp}, func, *args, **kw)
  File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\python\log.py", line 69, in callWithContext
    return context.call({ILogContext: newCtx}, func, *args, **kw)
  File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\python\context.py", line 59, in callWithContext
    return self.currentContext().callWithContext(ctx, func, *args, **kw)
  File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\python\context.py", line 37, in callWithContext
    return func(*args,**kw)
  File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\internet\_threadedselect.py", line 303, in _doReadOrWrite
    self._disconnectSelectable(selectable, why, method == "doRead")
  File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\internet\posixbase.py", line 253, in _disconnectSelectable
    selectable.connectionLost(f)
  File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\internet\tcp.py", line 677, in connectionLost
    Connection.connectionLost(self, reason)
  File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\internet\tcp.py", line 519, in connectionLost
    protocol.connectionLost(reason)
  File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\web\http.py", line 489, in connectionLost
    self.handleResponseEnd()
  File "C:\Documents and Settings\Admin\My Documents\Mercurial\sharky\ProxyServer.py", line 103, in handleResponseEnd
    p.channel.transport.loseConnection()
exceptions.AttributeError: 'NoneType' object has no attribute 'transport'

Answer 1

如果没有网络外出，连接可能会丢失。只需要连接的一端调用shutdown（）或close（）即可。你排除了吗？即使你有，为了使代码正确，它仍然需要处理这种可能性，因为它可能在其他时间发生。请参阅Request.notifyFinish。

在LostConnection上将Twisted HTTP Proxy Channel设置为None但尚未调用lostConnection

1 个答案: