Re: [Twisted-Python] Writing onto txWS

29 Jun 2012

      On Fri, Jun 29, 2012 at 04:52:06PM +0200, vinod kumar wrote:
...
Hi All,
I have run and edited the example provided for txWS. The writing part
from server to client browser is shown only as self.transport.write()
inside dataReceived function in websockets.py. how do I write on to the
socket i.e. on to the browser, from a different function inside server
code(server.tac). I'm just starting another xmlrpc server on a thread where
I receive some notifications. I need to forward the same to socket. The
bold point below  is where I want to write on to socket. How can we do
that? Please help me out.
-------------------------------------------------------
import time
from twisted.internet import reactor
from twisted.application import internet
from twisted.application.service import Application, Service
import xmlrpclib
from txws import WebSocketFactory
from src.protocols.websockets import WebSocketServerFactory
from constants import *
class WebSocketService(Service):
    """
    A simple service that listens on port 8077 for WebSockets traffic.
    """
    def __init__(self):
        self.start_time = time.time()
def start_service(self, application):
        """
        Gets the show on the road. Fires up a factory, binds the port.
        """
        echofactory = WebSocketServerFactory(self)
        factory = WebSocketFactory(echofactory)
        ws_server = internet.TCPServer(8077, factory)
        ws_server.setName('ws-tcp')
        ws_server.setServiceParent(application)
def shutdown(self):
        """
        Gracefully shuts down the service.
        """
        reactor.callLater(0, reactor.stop)
def listDevices(id):
print "listDevice: %(id)s" % {"id": str(id)}
 return None
def event(id, address, key, value):
        #websocket.send("ufffffffffuuuuuu")
*        #I need to write the below print statement on to browser *
        print "event: %(id)s: %(address)s: %(key)s = %(value)s" % {"id":
str(id),
"address": str(address), "key": str(key), "value": str(value)}
def aSillyBlockingMethod(x):
    import time
    import xmlrpclib
    time.sleep(2)
    from SimpleXMLRPCServer import SimpleXMLRPCServer
    from SimpleXMLRPCServer import SimpleXMLRPCRequestHandler
    from constants import *
    server = SimpleXMLRPCServer((SERVER_IP, SERVER_PORT), logRequests=True,
allow_none=True)
    server.register_introspection_functions()
    server.register_multicall_functions()
    print "server started at %s" % str(SERVER_URL)
    server.register_function(listDevices)
    server.register_function(event)
    print 'function also got registered'
    server.serve_forever()
    .............................continues
Thanks,
Vinodh
Hi Vinodh,

txWS merely lets you connect to a Twisted Factory through WebSockets.
You will still need to structure your code such that the events that you
are responding to are connected to that Factory.

It might be helpful to rewrite your XML-RPC server to use Twisted's
XML-RPC (see
http://twistedmatrix.com/documents/current/web/howto/xmlrpc.html for a
tutorial on that) and then it will be easier to hook up your events
without having to worry about threading or other blocking things.

If you're having specific problems with txWS, let me know; it's
important to us that txWS work smoothly for people using it.

~ C.

Re: [Twisted-Python] Writing onto txWS

Corbin Simpson