python-twisted

from twisted.internet import reactor, protocol


class Echo(protocol.Protocol):
    """This is just about the simplest possible protocol"""
    
    def dataReceived(self, data):
        "As soon as any data is received, write it back."
        self.transport.write(data)


def main():
    """This runs the protocol on port 8000"""
    factory = protocol.ServerFactory()
    factory.protocol = Echo
    reactor.listenTCP(8000,factory)
    reactor.run()

# this only runs if the module was *not* imported
if __name__ == ‘__main__‘:
    main()

from twisted.internet import reactor, protocol


# a client protocol

class EchoClient(protocol.Protocol):
    """Once connected, send a message, then print the result."""
    
    def connectionMade(self):
        self.transport.write("hello, world!")
    
    def dataReceived(self, data):
        "As soon as any data is received, write it back."
        print "Server said:", data
        data2= raw_input()
        if data2!=‘EOM‘:
            self.transport.write(data2)
        else:        
            self.transport.loseConnection()
    
    def connectionLost(self, reason):
        print "connection lost"

class EchoFactory(protocol.ClientFactory):
    protocol = EchoClient

    def clientConnectionFailed(self, connector, reason):
        print "Connection failed - goodbye!"
        reactor.stop()
    
    def clientConnectionLost(self, connector, reason):
        print "Connection lost - goodbye!"
        reactor.stop()


# this connects the protocol to a server runing on port 8000
def main():
    f = EchoFactory()
    reactor.connectTCP("localhost", 8000, f)
    reactor.run()

# this only runs if the module was *not* imported
if __name__ == ‘__main__‘:
    main()