Python in a Nutshell

Name

server

Synopsis

The h .server attribute is the instance of the server class that instantiated this handler object.

Example 19-5 uses module SocketServer to reimplement the server of Example 19-1 with the added ability to serve multiple clients simultaneously by threading.

Example 19-5. Threaded TCP echo server using SocketServer

import SocketServer
class EchoHandler(SocketServer.BaseRequestHandler):
    def handle(self):
        print "Connected from", self.client_address
        while True:
            receivedData = self.request.recv(8192)
            if not receivedData: break
            self.request.sendall(receivedData)
        self.request.close( )
        print "Disconnected from", self.client_address
srv = SocketServer.ThreadingTCPServer(('',8881),EchoHandler)
srv.serve_forever( )

Run the server of Example 19-5 on a terminal window, and try a few runs of Example 19-2 while the server is running. Try also telnet localhost 8881 on other terminal windows (or other platform-dependent Telnet-like programs) to verify the behavior of longer-term connections.