Sending data from one Protocol to another Protocol in Twisted?

Question

One of my protocols is connected to a server, and with the output of that I'd like to send it to the other protocol.

I need to access the 'msg' method in ClassA from ClassB but I keep getting: exceptions.AttributeError: 'NoneType' object has no attribute 'write'

Actual code:

from twisted.words.protocols import irc
from twisted.internet import protocol
from twisted.internet.protocol import Protocol, ClientFactory
from twisted.internet import reactor

IRC_USERNAME = 'xxx'
IRC_CHANNEL = '#xxx'
T_USERNAME = 'xxx'
T_PASSWORD = md5.new('xxx').hexdigest()

class ircBot(irc.IRCClient):
    def _get_nickname(self):
        return self.factory.nickname

    nickname = property(_get_nickname)

    def signedOn(self):
        self.join(self.factory.channel)
        print "Signed on as %s." % (self.nickname,)

    def joined(self, channel):
        print "Joined %s." % (channel,)

    def privmsg(self, user, channel, msg):
        if not user:
                return

        who = "%s: " % (user.split('!', 1)[0], )
        print "%s %s" % (who, msg)

class ircBotFactory(protocol.ClientFactory):
    protocol = ircBot

    def __init__(self, channel, nickname=IRC_USERNAME):
        self.channel = channel
        self.nickname = nickname

    def clientConnectionLost(self, connector, reason):
        print "Lost connection (%s), reconnecting." % (reason,)
        connector.connect()

    def clientConnectionFailed(self, connector, reason):
        print "Could not connect: %s" % (reason,)

class SomeTClass(Protocol):
    def dataReceived(self, data):
        if data.startswith('SAY'):
                data = data.split(';', 1)
                # RAGE
                #return self.ircClient.msg(IRC_CHANNEL, 'test')

    def connectionMade(self):
        self.transport.write("mlogin %s %s\n" % (T_USERNAME, T_PASSWORD))

class tClientFactory(ClientFactory):
    def startedConnecting(self, connector):
        print 'Started to connect.'

    def buildProtocol(self, addr):
        print 'Connected.'
        return t()

    def clientConnectionLost(self, connector, reason):
        print 'Lost connection.  Reason:', reason

    def clientConnectionFailed(self, connector, reason):
        print 'Connection failed. Reason:', reason

if __name__ == "__main__":
    #chan = sys.argv[1]
    reactor.connectTCP('xxx', 6667, ircBotFactory(IRC_CHANNEL) )
    reactor.connectTCP('xxx', 20184, tClientFactory() )
    reactor.run()

Any ideas please? :-)

Answer 1

Twisted FAQ:

How do I make input on one connection result in output on another?

This seems like it's a Twisted question, but actually it's a Python question. Each Protocol object represents one connection; you can call its transport.write to write some data to it. These are regular Python objects; you can put them into lists, dictionaries, or whatever other data structure is appropriate to your application.

As a simple example, add a list to your factory, and in your protocol's connectionMade and connectionLost, add it to and remove it from that list. Here's the Python code:

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

class MultiEcho(Protocol):
    def connectionMade(self):
        self.factory.echoers.append(self)
    def dataReceived(self, data):
        for echoer in self.factory.echoers:
            echoer.transport.write(data)
    def connectionLost(self, reason):
        self.factory.echoers.remove(self)

class MultiEchoFactory(Factory):
    protocol = MultiEcho
    def __init__(self):
        self.echoers = []

reactor.listenTCP(4321, MultiEchoFactory())
reactor.run()