frontend.py

###############################################################################
#
# The MIT License (MIT)
#
# Copyright (c) typedef int GmbH
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
###############################################################################

from os import environ

from autobahn.twisted.wamp import ApplicationRunner, ApplicationSession
from twisted.internet import reactor
from twisted.internet.defer import inlineCallbacks


class Component(ApplicationSession):
    """
    An application component that subscribes and receives events, and
    stop after having received 5 events.
    """

    @inlineCallbacks
    def onJoin(self, details):
        print("session attached")
        self.received = 0
        sub = yield self.subscribe(self.on_event, "com.myapp.topic1")
        print("Subscribed to com.myapp.topic1 with {}".format(sub.id))

    def on_event(self, i):
        print("Got event: {}".format(i))
        self.received += 1
        # self.config.extra for configuration, etc. (see [A])
        if self.received > self.config.extra["max_events"]:
            print("Received enough events; disconnecting.")
            self.leave()

    def onDisconnect(self):
        print("disconnected")
        if reactor.running:
            reactor.stop()


if __name__ == "__main__":
    url = environ.get("AUTOBAHN_DEMO_ROUTER", "ws://127.0.0.1:8080/ws")
    realm = "crossbardemo"
    extra = dict(
        max_events=5,  # [A] pass in additional configuration
    )
    runner = ApplicationRunner(url, realm, extra)
    runner.run(Component)