[Twisted-Python] anyway to get data from a protocol instance?

[Torsten Irländer]

On Wed, Aug 09, 2006 at 04:43:19PM +0800, wang wei wrote:
> please have a look of fellow code.
> 
> from twisted.internet import reactor, protocol
> 
> class echo(protocol.Protocol):
>    def __init__(self):
>        from Queue import Queue
>        self.q = Queue()
> 
>    def lineReceived(self, line):
>        self.q.put(line)
> 
> class echofactory(protocol.ServerFactory):
> 
>    def buildProtocol(self, addr):
>        p = echo()
>        p.factory = self
>        return p
> 
> class runEcho:
>    def __init__(self):
>        a = echofactory()
>        reactor.listenTCP(1024, a)
>        reactor.run()
> 
> 
> My question is how can I get size of Queue q from another class when the
> program running.

That is a question I'm also interested in a good answer. My proposal would be
to return the protocol object as a deferred. For me this works, but I'm not
sure if this is a good approach. I extended wang wei's code so that the
protocol data can be accessed by other classes. 

from twisted.internet import reactor, protocol, defer

class echo(protocol.Protocol):
    def __init__(self):
        from Queue import Queue
        self.q = Queue()

    def connectionMade(self):
        self.factory.deferred.callback(self)
            
    def lineReceived(self, line):
        print line
        self.q.put(line)

class echofactory(protocol.ServerFactory):

    def __init__(self):
        self.deferred = defer.Deferred()
            
    def buildProtocol(self, addr):
        p = echo()
        p.factory = self
        return p 
            
class runEcho:
    def connect(self):
        a = echofactory()
        a.deferred.addCallback(self.set_myprotocol)
        reactor.listenTCP(1024, a)
        reactor.run()

    def set_myprotocol(self,proto):
        print "protocol ready!" 
        self.proto = proto
        print self.proto.q

r = runEcho()
r.connect()


Can anyone give some comments on this? I am at the very beginning
of twisted programming and I'm not sure if this is a good way to
access the protocol class from the outside.

best regards
Torsten