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Created July 3, 2014 12:21
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Python 3 socket server
#! /usr/bin/python3
# Socket server in python using select function
import socket, select
if __name__ == "__main__":
CONNECTION_LIST = [] # list of socket clients
RECV_BUFFER = 4096 # Advisable to keep it as an exponent of 2
PORT = 5000
server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
# this has no effect, why ?
server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
server_socket.bind(("0.0.0.0", PORT))
server_socket.listen(10)
# Add server socket to the list of readable connections
CONNECTION_LIST.append(server_socket)
print("Chat server started on port " + str(PORT))
while 1:
# Get the list sockets which are ready to be read through select
read_sockets,write_sockets,error_sockets = select.select(CONNECTION_LIST,[],[])
for sock in read_sockets:
#New connection
if sock == server_socket:
# Handle the case in which there is a new connection recieved through server_socket
sockfd, addr = server_socket.accept()
CONNECTION_LIST.append(sockfd)
print("Client (%s, %s) connected" % addr)
#Some incoming message from a client
else:
# Data recieved from client, process it
try:
#In Windows, sometimes when a TCP program closes abruptly,
# a "Connection reset by peer" exception will be thrown
data = sock.recv(RECV_BUFFER)
# echo back the client message
if data:
sock.send(str.encode('OK ... ' + bytes.decode(data)))
# client disconnected, so remove from socket list
except:
broadcast_data(sock, "Client (%s, %s) is offline" % addr)
print ("Client (%s, %s) is offline" % addr)
sock.close()
CONNECTION_LIST.remove(sock)
continue
# while loop over, close the server socket
server_socket.close()
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ghost commented Sep 21, 2014

Thnks!

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