Hi,
I have a similar problem as described in this old mail [1] except
that I am not using threads at all.
Basically my app is a server that accepts connections from a client
(connection A), when A is established it opens connections B and C
to another server and forwards data from A to B and from C back to A.
Here is how data is forwarded:
def forward(_from, to):
_from.dataReceived = to.transport.write
to.transport.registerProducer(_from.transport, True)
def loseConnection(proto, onlost=lambda *args: None):
proto.connectionLost = onlost
proto.transport.unregisterProducer()
proto.transport.loseConnection()
as soon as connectionMade has been called on connection A, B and C:
forward(A_protocol, B_protocol)
forward(C_protocol, A_protocol)
as soon as it decides its job is done and wants to tear down all
connections:
loseConnection(B_protocol)
loseConnection(C_protocol, lambda *a: loseConnection(A_protocol))
>From the debug logs in my code I am sure that the loseConnection
function is always called with the A_protocol as argument, yet
sometimes and totally unpredictably as far as I can tell
connectionLost is not called on some A_protocol instances and
corresponding A connections get stuck in CLOSE_WAIT state.
Another hint is that netstat shows 1 byte in the Recv-Q for those
connections (and 0 in the Send-Q).
>From another mail [2] in that old thread I got this snippet
"""
Your issue with CLOSE_WAIT sockets could be due to registering
producers which have no further data to produce.
"""
This sounds like it could be my case, even if as you can see I am
always unregistering producers from transports before I call
loseConnection on them.
Does this sound familiar in any way? Any suggestions off top of head
while I try to come up with a self-contained sample which is
reliably reproducing the issue I'm seeing happening only "sometimes
and quite seldom[TM]"?
Thanks, ciao
ste
[1]
http://twistedmatrix.com/pipermail/twisted-python/2008-June/017853.html
http://twistedmatrix.com/pipermail/twisted-python/2008-June/017855.html
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