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!
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