180 lines
6.2 KiB
Python
180 lines
6.2 KiB
Python
###############################################################################
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#
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# The MIT License (MIT)
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#
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# Copyright (c) Crossbar.io Technologies GmbH
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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#
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###############################################################################
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from __future__ import absolute_import
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import signal
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import six
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from autobahn.wamp import protocol
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from autobahn.wamp.types import ComponentConfig
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from autobahn.websocket.util import parse_url
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from autobahn.asyncio.websocket import WampWebSocketClientFactory
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try:
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import asyncio
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except ImportError:
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# Trollius >= 0.3 was renamed to asyncio
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# noinspection PyUnresolvedReferences
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import trollius as asyncio
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import txaio
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txaio.use_asyncio()
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__all__ = (
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'ApplicationSession',
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'ApplicationSessionFactory',
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'ApplicationRunner'
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)
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class ApplicationSession(protocol.ApplicationSession):
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"""
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WAMP application session for asyncio-based applications.
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"""
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class ApplicationSessionFactory(protocol.ApplicationSessionFactory):
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"""
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WAMP application session factory for asyncio-based applications.
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"""
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session = ApplicationSession
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"""
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The application session class this application session factory will use.
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Defaults to :class:`autobahn.asyncio.wamp.ApplicationSession`.
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"""
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class ApplicationRunner(object):
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"""
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This class is a convenience tool mainly for development and quick hosting
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of WAMP application components.
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It can host a WAMP application component in a WAMP-over-WebSocket client
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connecting to a WAMP router.
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"""
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log = txaio.make_logger()
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def __init__(self, url, realm, extra=None, serializers=None, ssl=None):
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"""
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:param url: The WebSocket URL of the WAMP router to connect to (e.g. `ws://somehost.com:8090/somepath`)
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:type url: unicode
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:param realm: The WAMP realm to join the application session to.
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:type realm: unicode
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:param extra: Optional extra configuration to forward to the application component.
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:type extra: dict
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:param serializers: A list of WAMP serializers to use (or None for default serializers).
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Serializers must implement :class:`autobahn.wamp.interfaces.ISerializer`.
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:type serializers: list
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:param ssl: An (optional) SSL context instance or a bool. See
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the documentation for the `loop.create_connection` asyncio
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method, to which this value is passed as the ``ssl=``
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kwarg.
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:type ssl: :class:`ssl.SSLContext` or bool
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"""
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assert(type(url) == six.text_type)
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assert(type(realm) == six.text_type)
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assert(extra is None or type(extra) == dict)
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self.url = url
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self.realm = realm
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self.extra = extra or dict()
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self.serializers = serializers
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self.ssl = ssl
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def run(self, make):
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"""
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Run the application component.
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:param make: A factory that produces instances of :class:`autobahn.asyncio.wamp.ApplicationSession`
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when called with an instance of :class:`autobahn.wamp.types.ComponentConfig`.
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:type make: callable
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"""
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# 1) factory for use ApplicationSession
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def create():
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cfg = ComponentConfig(self.realm, self.extra)
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try:
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session = make(cfg)
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except Exception as e:
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self.log.error('ApplicationSession could not be instantiated: {}'.format(e))
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loop = asyncio.get_event_loop()
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if loop.is_running():
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loop.stop()
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raise
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else:
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return session
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isSecure, host, port, resource, path, params = parse_url(self.url)
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if self.ssl is None:
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ssl = isSecure
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else:
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if self.ssl and not isSecure:
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raise RuntimeError(
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'ssl argument value passed to %s conflicts with the "ws:" '
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'prefix of the url argument. Did you mean to use "wss:"?' %
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self.__class__.__name__)
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ssl = self.ssl
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# 2) create a WAMP-over-WebSocket transport client factory
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transport_factory = WampWebSocketClientFactory(create, url=self.url, serializers=self.serializers)
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# 3) start the client
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loop = asyncio.get_event_loop()
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txaio.use_asyncio()
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txaio.config.loop = loop
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coro = loop.create_connection(transport_factory, host, port, ssl=ssl)
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(transport, protocol) = loop.run_until_complete(coro)
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# start logging
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txaio.start_logging(level='info')
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try:
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loop.add_signal_handler(signal.SIGTERM, loop.stop)
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except NotImplementedError:
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# signals are not available on Windows
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pass
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# 4) now enter the asyncio event loop
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try:
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loop.run_forever()
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except KeyboardInterrupt:
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# wait until we send Goodbye if user hit ctrl-c
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# (done outside this except so SIGTERM gets the same handling)
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pass
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# give Goodbye message a chance to go through, if we still
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# have an active session
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if protocol._session:
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loop.run_until_complete(protocol._session.leave())
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loop.close()
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