# chat_server.py
import sys
import socket
import select
HOST = ''
SOCKET_LIST = []
RECV_BUFFER = 4096
PORT = 9009
def chat_server():
server_socket=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
server_socket.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,
1)
server_socket.bind((HOST, PORT))
server_socket.listen(10)
# add server socket object to the list of readable connections
SOCKET_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
# 4th arg,
time_out = 0 : poll and never block
ready_to_read,ready_to_write,in_error=select.select(SOCKET_LIST,[],[],0)
for sock in ready_to_read:
# a new
connection request recieved
if sock ==
server_socket:
sockfd,
addr = server_socket.accept()
SOCKET_LIST.append(sockfd)
print "Client
(%s, %s) connected" % addr
broadcast(server_socket,
sockfd, "[%s:%s] entered our chatting room\n" % addr)
# a message
from a client, not a new connection
else:
# process
data recieved from client,
try:
# receiving
data from the socket.
data = sock.recv(RECV_BUFFER)
if data:
# there is
something in the socket
broadcast(server_socket, sock, "\r"
+ '[' + str(sock.getpeername()) + '] ' + data)
else:
# remove
the socket that's broken
if sock in
SOCKET_LIST:
SOCKET_LIST.remove(sock)
# at this
stage, no data means probably the connection has been broken
broadcast(server_socket,
sock, "Client (%s, %s) is offline\n" % addr)
#
exception
except:
broadcast(server_socket,
sock, "Client (%s, %s) is offline\n" % addr)
continue
server_socket.close()
*****************************************************************
# broadcast chat messages to all connected clients
def broadcast (server_socket, sock, message):
for socket in
SOCKET_LIST:
# send the message
only to peer
if socket !=
server_socket and socket != sock :
try :
socket.send(message)
except :
# broken
socket connection
socket.close()
# broken
socket, remove it
if socket
in SOCKET_LIST:
SOCKET_LIST.remove(socket)
if __name__ == "__main__":
sys.exit(chat_server())
#**********************************************************
# chat_client.py
import sys
import socket
import select
def chat_client():
if(len(sys.argv) < 3) :
print 'Usage : python chat_client.py hostname port'
sys.exit()
host = sys.argv[1]
port = int(sys.argv[2])
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.settimeout(2)
# connect to remote host
try :
s.connect((host, port))
except :
print 'Unable to connect'
sys.exit()
print 'Connected to remote host. You can start sending messages'
sys.stdout.write('[Me] '); sys.stdout.flush()
while 1:
socket_list = [sys.stdin, s]
# Get the list sockets which are readable
ready_to_read,ready_to_write,in_error =
select.select(socket_list , [], [])
for sock in ready_to_read:
if sock == s:
# incoming message from remote server, s
data = sock.recv(4096)
if not data :
print '\nDisconnected from chat server'
sys.exit()
else :
#print data
sys.stdout.write(data)
sys.stdout.write('[Me] '); sys.stdout.flush()
else :
# user entered a message
msg = sys.stdin.readline()
s.send(msg)
sys.stdout.write('[Me] '); sys.stdout.flush()
if __name__ == "__main__":
sys.exit(chat_client())
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