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import os
import pkg_resources

from twisted.python import log
from twisted.internet import reactor
from twisted.application import service

from twisted.web.server import Site
from twisted.web.static import File

from autobahn.websocket import WebSocketServerFactory, \
    WebSocketServerProtocol

from autobahn.resource import WebSocketResource


class EchoServerProtocol(WebSocketServerProtocol):

    def onMessage(self, msg, binary):
        self.sendMessage(msg, binary)


class EchoService(service.Service):

    """
    WebSocket Echo service - this runs a Twisted Web site with a WebSocket
    echo server running under path "/ws".
    """

    def __init__(self, port=8080):
        self.port = port

    def startService(self):

        factory = WebSocketServerFactory(u"ws://127.0.0.1:%d" % self.port)
        factory.protocol = EchoServerProtocol

        # FIXME: Site.start/stopFactory should start/stop factories wrapped as Resources
        factory.startFactory()

        resource = WebSocketResource(factory)

        # we server static files under "/" ..
        webdir = os.path.abspath(pkg_resources.resource_filename("echows", "web"))
        root = File(webdir)

        # and our WebSocket server under "/ws" (note that Twisted uses
        # bytes for URIs)
        root.putChild(b"ws", resource)

        # both under one Twisted Web Site
        site = Site(root)

        self.site = site
        self.factory = factory

        self.listener = reactor.listenTCP(self.port, site)

    def stopService(self):
        self.factory.stopFactory()
        self.site.stopFactory()
        self.listener.stopListening()
