#########################################################
# Server side: open a socket on a port, listen for
# a message from a client, and send an echo reply; 
# this version uses the standard library module 
# SocketServer to do its work; SocketServer allows
# us to make a simple TCPServer, a ThreadingTCPServer,
# a ForkingTCPServer, and more, and routes each client
# connect request to a new instance of a passed-in 
# request handler object's handle method; also supports
# UDP and Unix domain sockets; see the library manual.
#########################################################

import SocketServer, time               # get socket server, handler objects
myHost = ''                             # server machine, '' means local host
myPort = 50007                          # listen on a non-reserved port number
def now(): 
    return time.ctime(time.time())

class MyClientHandler(SocketServer.BaseRequestHandler):
    def handle(self):                           # on each client connect
        print self.client_address, now()        # show this client's address
        time.sleep(5)                           # simulate a blocking activity
        while 1:                                # self.request is client socket
            data = self.request.recv(1024)      # read, write a client socket
            if not data: break
            self.request.send('Echo=>%s at %s' % (data, now()))
        self.request.close() 

# make a threaded server, listen/handle clients forever
myaddr = (myHost, myPort)
server = SocketServer.ThreadingTCPServer(myaddr, MyClientHandler)
server.serve_forever()