On Thursday, February 25, 2016 at 12:56:10 PM UTC-5, Ray wrote:
> hi,
>
> I'm new to python networking. I am waiting TCP server/client app by using
> python built-in SocketServer. My problem is if client get killed, then the
> tcp port will never get released, in CLOSE_WAIT
>
> maybe I didn't do the handler right? or anyway I can catch the client get
> killed?
>
> I wrote following simple code to explain the issue I have, server listen on
> 127.0.0.1:1234
> client need to send multi-messages (I am sending 2 in this test) if client
> get killed (I just do kill client_pid) then if I check lsof, I will see the
> new allocated tcp do not get released
>
> ########server.py########
>
> #!/usr/bin/python
> import threading
> import SocketServer
> import time
>
> class TCPServerRequestHandler(SocketServer.BaseRequestHandler):
>
> def handle(self):
> while True:
> data=self.request.recv(1024)
> if not data:
> time.sleep(0.1)
> continue
> print data
> self.request.send(data)
> if data=='end':
> break
>
> def main():
> server = TCPServer(('127.0.0.1', 1234), TCPServerRequestHandler)
> ip, port = server.server_address
> server_thread = threading.Thread(target=server.serve_forever)
> server_thread.daemon = True
> server_thread.start()
> time.sleep(600)
> server.shutdown()
> server.server_close()
> if __name__=='__main__':
> main()
>
> ########client.py########
> import socket
> import time
>
> def client():
> sock=socket.socket(socket.AF_INET, socket.SOCK_STREAM)
> sock.connect(('127.0.0.1', 1234))
> sock.sendall('hello')
> response=sock.recv(1024)
> print "Received:", response
> time.sleep(60)
> sock.sendall('end')
> response=sock.recv(1024)
> print "Received:", response
> sock.close()
>
> if __name__=='__main__':
> client()
>
>
> when I run it, client has 60 seconds sleep, so I just kill the process from OS
> kill 93948
>
> then I'm running lsof to find my TCP/UDP
> lsof -n -p $(ps -ef|grep serve[r]|awk '{print $2}')|egrep '(TCP|UDP)'|awk
> '{print $NF}'
>
> TCP 127.0.0.1:search-agent (LISTEN)
> TCP 127.0.0.1:search-agent->127.0.0.1:59411 (CLOSE_WAIT)
>
> I will see the CLOSE_WAIT, this is where the client get killed.
>
>
> any help would be great!
>
> Thanks a lot!
I fond the issue. it's my own stupid issue.
i did "continue" if no data received.
just break from it then it will be fine
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