twgs-proxy/examples/twisted_basic_server.py

#!/usr/bin/env python3

# pg 665 of Learning Python Networking

from twisted.internet import reactor
from twisted.internet.protocol import Protocol, Factory

class MessageLogger(Protocol):
    def connectionMade(self):
        print('Client connection from:', self.transport.client)

    def connectionLost(self, reason):
        print('Client disconnected from:', self.transport.client)

    def dataReceived(self, data):
        self.transport.write(data)
        print("Message sent by the client: ", data.decode("utf-8"))


class MessageFactory(Factory):
    def buildProtocol(self, addr):
        print("building MessageLogger for:", addr)
        return MessageLogger()

    # I don't see these methods EVER being called?!

    def clientConnectionFailed(self, connector, reason):
        print ("Connection failed")
        reactor.stop()

    def clientConnectionLost(self, connector, reason):
        print ("Connection lost")
        reactor.stop()


#this connects the protocol to a server running on port 8080 
if __name__ == '__main__':
    factory = Factory()
    factory.protocol = MessageLogger
    reactor.listenTCP(8081, factory)

    # Using MessageFactory class, I can print information on "buildProtocol" call.
    reactor.listenTCP(8080, MessageFactory())
    reactor.run()