def _transport_factory(self):
"create and return the transport factory"
try:
factory = WampWebSocketClientFactory(
self._component,
url=self.wmp_url,
serializers=self.wmp_serializers,
loop=self._loop)
except Exception as exc:
raise Exception("could not build transport factory: %s" % exc)
else:
factory._session_joined = asyncio.Future(loop=self._loop)
self._logger.info("WAMP connecting to %s, realm '%s'" %
(self.wmp_url, self.wmp_realm))
return factory
