295 lines
11 KiB
Python
295 lines
11 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 traceback
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from autobahn.websocket import protocol
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from autobahn.websocket.types import ConnectionDeny
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from autobahn.wamp.interfaces import ITransport
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from autobahn.wamp.exception import ProtocolError, SerializationError, TransportLost
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__all__ = ('WampWebSocketServerProtocol',
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'WampWebSocketClientProtocol',
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'WampWebSocketServerFactory',
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'WampWebSocketClientFactory')
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class WampWebSocketProtocol(object):
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"""
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Base class for WAMP-over-WebSocket transport mixins.
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"""
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_session = None # default; self.session is set in onOpen
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def _bailout(self, code, reason=None):
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self.log.debug('Failing WAMP-over-WebSocket transport: code={code}, reason="{reason}"', code=code, reason=reason)
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self._fail_connection(code, reason)
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def onOpen(self):
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"""
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Callback from :func:`autobahn.websocket.interfaces.IWebSocketChannel.onOpen`
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"""
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# WebSocket connection established. Now let the user WAMP session factory
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# create a new WAMP session and fire off session open callback.
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try:
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self._session = self.factory._factory()
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self._session.onOpen(self)
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except Exception as e:
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self.log.critical("{tb}", tb=traceback.format_exc())
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reason = u'WAMP Internal Error ({0})'.format(e)
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self._bailout(protocol.WebSocketProtocol.CLOSE_STATUS_CODE_INTERNAL_ERROR, reason=reason)
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def onClose(self, wasClean, code, reason):
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"""
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Callback from :func:`autobahn.websocket.interfaces.IWebSocketChannel.onClose`
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"""
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# WAMP session might never have been established in the first place .. guard this!
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if self._session is not None:
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# WebSocket connection lost - fire off the WAMP
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# session close callback
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# noinspection PyBroadException
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try:
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self.log.debug('WAMP-over-WebSocket transport lost: wasClean={wasClean}, code={code}, reason="{reason}"', wasClean=wasClean, code=code, reason=reason)
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self._session.onClose(wasClean)
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except Exception:
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self.log.critical("{tb}", tb=traceback.format_exc())
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self._session = None
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def onMessage(self, payload, isBinary):
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"""
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Callback from :func:`autobahn.websocket.interfaces.IWebSocketChannel.onMessage`
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"""
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try:
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for msg in self._serializer.unserialize(payload, isBinary):
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self.log.trace(
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"WAMP RECV: message={message}, session={session}, authid={authid}",
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authid=self._session._authid,
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session=self._session._session_id,
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message=msg,
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)
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self._session.onMessage(msg)
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except ProtocolError as e:
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self.log.critical("{tb}", tb=traceback.format_exc())
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reason = u'WAMP Protocol Error ({0})'.format(e)
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self._bailout(protocol.WebSocketProtocol.CLOSE_STATUS_CODE_PROTOCOL_ERROR, reason=reason)
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except Exception as e:
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self.log.critical("{tb}", tb=traceback.format_exc())
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reason = u'WAMP Internal Error ({0})'.format(e)
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self._bailout(protocol.WebSocketProtocol.CLOSE_STATUS_CODE_INTERNAL_ERROR, reason=reason)
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def send(self, msg):
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"""
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Implements :func:`autobahn.wamp.interfaces.ITransport.send`
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"""
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if self.isOpen():
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try:
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self.log.trace(
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"WAMP SEND: message={message}, session={session}, authid={authid}",
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authid=self._session._authid,
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session=self._session._session_id,
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message=msg,
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)
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payload, isBinary = self._serializer.serialize(msg)
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except Exception as e:
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self.log.error("WAMP message serialization error: {}".format(e))
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# all exceptions raised from above should be serialization errors ..
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raise SerializationError(u"WAMP message serialization error: {0}".format(e))
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else:
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self.sendMessage(payload, isBinary)
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else:
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raise TransportLost()
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def isOpen(self):
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"""
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Implements :func:`autobahn.wamp.interfaces.ITransport.isOpen`
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"""
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return self._session is not None
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def close(self):
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"""
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Implements :func:`autobahn.wamp.interfaces.ITransport.close`
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"""
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if self.isOpen():
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self.sendClose(protocol.WebSocketProtocol.CLOSE_STATUS_CODE_NORMAL)
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else:
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raise TransportLost()
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def abort(self):
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"""
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Implements :func:`autobahn.wamp.interfaces.ITransport.abort`
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"""
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if self.isOpen():
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self._bailout(protocol.WebSocketProtocol.CLOSE_STATUS_CODE_GOING_AWAY)
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else:
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raise TransportLost()
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ITransport.register(WampWebSocketProtocol)
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def parseSubprotocolIdentifier(subprotocol):
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try:
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s = subprotocol.split(u'.')
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if s[0] != u'wamp':
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raise Exception(u'WAMP WebSocket subprotocol identifier must start with "wamp", not "{}"'.format(s[0]))
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version = int(s[1])
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serializerId = u'.'.join(s[2:])
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return version, serializerId
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except:
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return None, None
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class WampWebSocketServerProtocol(WampWebSocketProtocol):
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"""
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Mixin for WAMP-over-WebSocket server transports.
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"""
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STRICT_PROTOCOL_NEGOTIATION = True
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def onConnect(self, request):
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"""
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Callback from :func:`autobahn.websocket.interfaces.IWebSocketChannel.onConnect`
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"""
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headers = {}
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for subprotocol in request.protocols:
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version, serializerId = parseSubprotocolIdentifier(subprotocol)
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if version == 2 and serializerId in self.factory._serializers.keys():
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self._serializer = self.factory._serializers[serializerId]
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return subprotocol, headers
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if self.STRICT_PROTOCOL_NEGOTIATION:
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raise ConnectionDeny(ConnectionDeny.BAD_REQUEST, u'This server only speaks WebSocket subprotocols {}'.format(u', '.join(self.factory.protocols)))
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else:
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# assume wamp.2.json
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self._serializer = self.factory._serializers[u'json']
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return None, headers
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class WampWebSocketClientProtocol(WampWebSocketProtocol):
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"""
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Mixin for WAMP-over-WebSocket client transports.
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"""
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STRICT_PROTOCOL_NEGOTIATION = True
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def onConnect(self, response):
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"""
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Callback from :func:`autobahn.websocket.interfaces.IWebSocketChannel.onConnect`
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"""
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if response.protocol not in self.factory.protocols:
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if self.STRICT_PROTOCOL_NEGOTIATION:
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raise Exception(u'The server does not speak any of the WebSocket subprotocols {} we requested.'.format(u', '.join(self.factory.protocols)))
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else:
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# assume wamp.2.json
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serializerId = u'json'
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else:
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version, serializerId = parseSubprotocolIdentifier(response.protocol)
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self._serializer = self.factory._serializers[serializerId]
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class WampWebSocketFactory(object):
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"""
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Base class for WAMP-over-WebSocket transport factory mixins.
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"""
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def __init__(self, factory, serializers=None):
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"""
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Ctor.
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:param factory: A callable that produces instances that implement
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:class:`autobahn.wamp.interfaces.ITransportHandler`
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:type factory: callable
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:param serializers: A list of WAMP serializers to use (or None for default
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serializers). Serializers must implement
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:class:`autobahn.wamp.interfaces.ISerializer`.
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:type serializers: list
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"""
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if callable(factory):
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self._factory = factory
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else:
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self._factory = lambda: factory
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if serializers is None:
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serializers = []
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# try CBOR WAMP serializer
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try:
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from autobahn.wamp.serializer import CBORSerializer
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serializers.append(CBORSerializer(batched=True))
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serializers.append(CBORSerializer())
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except ImportError:
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pass
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# try MsgPack WAMP serializer
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try:
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from autobahn.wamp.serializer import MsgPackSerializer
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serializers.append(MsgPackSerializer(batched=True))
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serializers.append(MsgPackSerializer())
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except ImportError:
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pass
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# try UBJSON WAMP serializer
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try:
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from autobahn.wamp.serializer import UBJSONSerializer
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serializers.append(UBJSONSerializer(batched=True))
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serializers.append(UBJSONSerializer())
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except ImportError:
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pass
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# try JSON WAMP serializer
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try:
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from autobahn.wamp.serializer import JsonSerializer
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serializers.append(JsonSerializer(batched=True))
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serializers.append(JsonSerializer())
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except ImportError:
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pass
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if not serializers:
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raise Exception(u'Could not import any WAMP serializer')
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self._serializers = {}
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for ser in serializers:
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self._serializers[ser.SERIALIZER_ID] = ser
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self._protocols = [u'wamp.2.{}'.format(ser.SERIALIZER_ID) for ser in serializers]
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class WampWebSocketServerFactory(WampWebSocketFactory):
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"""
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Mixin for WAMP-over-WebSocket server transport factories.
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"""
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class WampWebSocketClientFactory(WampWebSocketFactory):
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"""
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Mixin for WAMP-over-WebSocket client transport factories.
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"""
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