Twisted exceptions

[exploide]

This came already up in another issue but just to keep track of it, twisted occasionally throws exceptions, cluttering the output of PowerHub.

Unhandled Error
Traceback (most recent call last):
  File "/home/user/Downloads/PowerHub/venv/lib/python3.7/site-packages/twisted/python/log.py", line 103, in callWithLogger
    return callWithContext({"system": lp}, func, *args, **kw)
  File "/home/user/Downloads/PowerHub/venv/lib/python3.7/site-packages/twisted/python/log.py", line 86, in callWithContext
    return context.call({ILogContext: newCtx}, func, *args, **kw)
  File "/home/user/Downloads/PowerHub/venv/lib/python3.7/site-packages/twisted/python/context.py", line 122, in callWithContext
    return self.currentContext().callWithContext(ctx, func, *args, **kw)
  File "/home/user/Downloads/PowerHub/venv/lib/python3.7/site-packages/twisted/python/context.py", line 85, in callWithContext
    return func(*args,**kw)
--- <exception caught here> ---
  File "/home/user/Downloads/PowerHub/venv/lib/python3.7/site-packages/twisted/internet/posixbase.py", line 614, in _doReadOrWrite
    why = selectable.doRead()
  File "/home/user/Downloads/PowerHub/venv/lib/python3.7/site-packages/twisted/internet/tcp.py", line 243, in doRead
    return self._dataReceived(data)
  File "/home/user/Downloads/PowerHub/venv/lib/python3.7/site-packages/twisted/internet/tcp.py", line 249, in _dataReceived
    rval = self.protocol.dataReceived(data)
  File "/home/user/Downloads/PowerHub/venv/lib/python3.7/site-packages/twisted/protocols/basic.py", line 579, in dataReceived
    why = self.rawDataReceived(data)
  File "/home/user/Downloads/PowerHub/venv/lib/python3.7/site-packages/twisted/web/http.py", line 645, in rawDataReceived
    self.handleResponsePart(data)
  File "/home/user/Downloads/PowerHub/venv/lib/python3.7/site-packages/twisted/web/proxy.py", line 77, in handleResponsePart
    self.father.write(buffer)
  File "/home/user/Downloads/PowerHub/venv/lib/python3.7/site-packages/twisted/web/server.py", line 238, in write
    http.Request.write(self, data)
  File "/home/user/Downloads/PowerHub/venv/lib/python3.7/site-packages/twisted/web/http.py", line 1118, in write
    self.channel.writeHeaders(version, code, reason, headers)
builtins.AttributeError: 'NoneType' object has no attribute 'writeHeaders'

Unhandled Error
Traceback (most recent call last):
  File "/home/user/Downloads/PowerHub/powerhub/reverseproxy.py", line 78, in run_proxy
    reactor.run()
  File "/home/user/Downloads/PowerHub/venv/lib/python3.7/site-packages/twisted/internet/base.py", line 1272, in run
    self.mainLoop()
  File "/home/user/Downloads/PowerHub/venv/lib/python3.7/site-packages/twisted/internet/base.py", line 1284, in mainLoop
    self.doIteration(t)
  File "/home/user/Downloads/PowerHub/venv/lib/python3.7/site-packages/twisted/internet/epollreactor.py", line 235, in doPoll
    log.callWithLogger(selectable, _drdw, selectable, fd, event)
--- <exception caught here> ---
  File "/home/user/Downloads/PowerHub/venv/lib/python3.7/site-packages/twisted/python/log.py", line 103, in callWithLogger
    return callWithContext({"system": lp}, func, *args, **kw)
  File "/home/user/Downloads/PowerHub/venv/lib/python3.7/site-packages/twisted/python/log.py", line 86, in callWithContext
    return context.call({ILogContext: newCtx}, func, *args, **kw)
  File "/home/user/Downloads/PowerHub/venv/lib/python3.7/site-packages/twisted/python/context.py", line 122, in callWithContext
    return self.currentContext().callWithContext(ctx, func, *args, **kw)
  File "/home/user/Downloads/PowerHub/venv/lib/python3.7/site-packages/twisted/python/context.py", line 85, in callWithContext
    return func(*args,**kw)
  File "/home/user/Downloads/PowerHub/venv/lib/python3.7/site-packages/twisted/internet/posixbase.py", line 627, in _doReadOrWrite
    self._disconnectSelectable(selectable, why, inRead)
  File "/home/user/Downloads/PowerHub/venv/lib/python3.7/site-packages/twisted/internet/posixbase.py", line 258, in _disconnectSelectable
    selectable.connectionLost(failure.Failure(why))
  File "/home/user/Downloads/PowerHub/venv/lib/python3.7/site-packages/twisted/internet/tcp.py", line 519, in connectionLost
    self._commonConnection.connectionLost(self, reason)
  File "/home/user/Downloads/PowerHub/venv/lib/python3.7/site-packages/twisted/internet/tcp.py", line 327, in connectionLost
    protocol.connectionLost(reason)
  File "/home/user/Downloads/PowerHub/venv/lib/python3.7/site-packages/twisted/web/http.py", line 599, in connectionLost
    self.handleResponseEnd()
  File "/home/user/Downloads/PowerHub/venv/lib/python3.7/site-packages/twisted/web/proxy.py", line 87, in handleResponseEnd
    self.father.finish()
  File "/home/user/Downloads/PowerHub/venv/lib/python3.7/site-packages/twisted/web/server.py", line 249, in finish
    return http.Request.finish(self)
  File "/home/user/Downloads/PowerHub/venv/lib/python3.7/site-packages/twisted/web/http.py", line 1046, in finish
    "Request.finish called on a request after its connection was lost; "
builtins.RuntimeError: Request.finish called on a request after its connection was lost; use Request.notifyFinish to keep track of this.

[AdrianVollmer]

I don't know why, but they're gone. I'm using twisted 20.3.0.

[AdrianVollmer]

I think they only stopped because socket.io stopped working a while ago. The JavaScript lib became incompatible with the python lib.

[AdrianVollmer]

Fixed in 2.0.0