gistfile1.py

###############################################################################
##
##  Copyright (C) 2014 Tavendo GmbH
##
##  Licensed under the Apache License, Version 2.0 (the "License");
##  you may not use this file except in compliance with the License.
##  You may obtain a copy of the License at
##
##      http://www.apache.org/licenses/LICENSE-2.0
##
##  Unless required by applicable law or agreed to in writing, software
##  distributed under the License is distributed on an "AS IS" BASIS,
##  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
##  See the License for the specific language governing permissions and
##  limitations under the License.
##
###############################################################################

import sys

from twisted.python import log
from twisted.internet import reactor
from twisted.internet.defer import inlineCallbacks
from twisted.internet.endpoints import clientFromString

from autobahn.twisted import wamp, websocket
from autobahn.wamp import types



class MyFrontendComponent(wamp.ApplicationSession):
   """
   Application code goes here. This is an example component that calls
   a remote procedure on a WAMP peer, subscribes to a topic to receive
   events, and then stops the world after some events.
   """

   @inlineCallbacks
   def onJoin(self, details):

      ## call a remote procedure
      ##
      try:
         now = yield self.call(u'com.timeservice.now')
      except Exception as e:
         print("Error: {}".format(e))
      else:
         print("Current time from time service: {}".format(now))

      ## subscribe to a topic
      ##
      self.received = 0

      def on_event(i):
         print("Got event: {}".format(i))
         self.received += 1
         if self.received > 5:
            self.leave()

      try:
         sub = yield self.subscribe(on_event, u'com.myapp.10.0.0.1')
      except Exception as e:
         print("Error: {}".format(e))
      else:
         print("Subscribed with subscription ID {}".format(sub.id))


   def onDisconnect(self):
      reactor.stop()



if __name__ == '__main__':

   ## 0) start logging to console
   log.startLogging(sys.stdout)

   ## 1) create a WAMP application session factory
   component_config = types.ComponentConfig(realm = "realm1")
   session_factory = wamp.ApplicationSessionFactory(config = component_config)
   session_factory.session = MyFrontendComponent

   ## optional: use specific set of serializers
   if False:
      serializers = None
   else:
      from autobahn.wamp.serializer import *
      serializers = []
      #serializers.append(JsonSerializer(batched = True))
      #serializers.append(MsgPackSerializer(batched = True))
      serializers.append(JsonSerializer())
      #serializers.append(MsgPackSerializer())

   ## 2) create a WAMP-over-WebSocket transport client factory
   transport_factory = websocket.WampWebSocketClientFactory(session_factory,
      serializers = serializers, debug = False, debug_wamp = False)

   ## 3) start the client from a Twisted endpoint
   client = clientFromString(reactor, "tcp:127.0.0.1:8080")
   client.connect(transport_factory)

   ## 4) now enter the Twisted reactor loop
   reactor.run()