Twisted HTTP代理通道在LostConnection上设置为None，但loseConnection尚未调用y

Question

好吧，我一直在写一个代理来接收httpget请求并将它们转换成httppost请求（因为很多python媒体播放器只支持GET）。所以我知道我在缓存这些结果，我只下载了一次url，我把很多代码从super类移到了sub类，并对其进行了更改，这样我就可以将相同的内容发送到多个服务器连接（例如，如果建立了服务器连接，我只会将其附加到下载实例（如果可用的话）。在

不管怎样，除了最后一部分（由于某些原因，在我调用loseConnection之前，http通道被设置为None（这没有任何错误，比如internet出站等），这会导致一个错误：None对象没有我调用loseConnection的属性transport。在

这是密码

    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()

以及自我频道设置为none（每个setattr调用上的回溯模块的print_堆栈）

注意：看最后几行，我想这就是问题所在。在

^{pr2}$

这是我得到的none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

如果没有互联网，连接可能会丢失。只需要连接的一端调用shutdown（）或close（）。你排除了吗？即使你有，为了代码是正确的，它仍然需要处理这种可能性，因为它可能会在其他时间发生。看到了吗请求.notifyFinish. 在