Sending data received in one Twisted factory to second factory

Question

I am trying to write a simple program using Twisted framework and I am struggling with resolving (or even with imaging how to write it) issue I couldnt find any relevant doc

Answer 1

Factories are just objects. To pass data from one to another, you define and call methods and pass the data as parameter, or set attributes. I think this faq question will help you:

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()