/usr/lib/python2.7/dist-packages/autobahn/wamp/protocol.py is in python-autobahn 0.10.3+dfsg1-5.
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#
# The MIT License (MIT)
#
# Copyright (c) Tavendo 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 __future__ import absolute_import
import traceback
import inspect
import six
from six import StringIO
from autobahn.wamp.interfaces import ISession, \
IPublication, \
IPublisher, \
ISubscription, \
ISubscriber, \
ICaller, \
IRegistration, \
ITransportHandler
from autobahn import util
from autobahn import wamp
from autobahn.wamp import uri
from autobahn.wamp import message
from autobahn.wamp import types
from autobahn.wamp import role
from autobahn.wamp import exception
from autobahn.wamp.exception import ApplicationError, ProtocolError, SessionNotReady, SerializationError
from autobahn.wamp.types import SessionDetails
import txaio
def is_method_or_function(f):
return inspect.ismethod(f) or inspect.isfunction(f)
class Request(object):
"""
Object representing an outstanding request, such as for subscribe/unsubscribe,
register/unregister or call/publish.
"""
def __init__(self, request_id, on_reply):
self.request_id = request_id
self.on_reply = on_reply
class InvocationRequest(Request):
"""
Object representing an outstanding request to invoke an endpoint.
"""
class CallRequest(Request):
"""
Object representing an outstanding request to call a procedure.
"""
def __init__(self, request_id, on_reply, options):
Request.__init__(self, request_id, on_reply)
self.options = options
class PublishRequest(Request):
"""
Object representing an outstanding request to publish (acknowledged) an event.
"""
class SubscribeRequest(Request):
"""
Object representing an outstanding request to subscribe to a topic.
"""
def __init__(self, request_id, on_reply, handler):
Request.__init__(self, request_id, on_reply)
self.handler = handler
class UnsubscribeRequest(Request):
"""
Object representing an outstanding request to unsubscribe a subscription.
"""
def __init__(self, request_id, on_reply, subscription_id):
Request.__init__(self, request_id, on_reply)
self.subscription_id = subscription_id
class RegisterRequest(Request):
"""
Object representing an outstanding request to register a procedure.
"""
def __init__(self, request_id, on_reply, procedure, endpoint):
Request.__init__(self, request_id, on_reply)
self.procedure = procedure
self.endpoint = endpoint
class UnregisterRequest(Request):
"""
Object representing an outstanding request to unregister a registration.
"""
def __init__(self, request_id, on_reply, registration_id):
Request.__init__(self, request_id, on_reply)
self.registration_id = registration_id
class Subscription(object):
"""
Object representing a handler subscription.
This class implements :class:`autobahn.wamp.interfaces.ISubscription`.
"""
def __init__(self, subscription_id, session, handler):
"""
"""
self.id = subscription_id
self.active = True
self.session = session
self.handler = handler
def unsubscribe(self):
"""
Implements :func:`autobahn.wamp.interfaces.ISubscription.unsubscribe`
"""
if self.active:
return self.session._unsubscribe(self)
else:
raise Exception("subscription no longer active")
def __str__(self):
return "Subscription(id={0}, is_active={1})".format(self.id, self.active)
ISubscription.register(Subscription)
class Handler(object):
"""
Object representing an event handler attached to a subscription.
"""
def __init__(self, fn, obj=None, details_arg=None):
"""
:param fn: The event handler function to be called.
:type fn: callable
:param obj: The (optional) object upon which to call the function.
:type obj: obj or None
:param details_arg: The keyword argument under which event details should be provided.
:type details_arg: str or None
"""
self.fn = fn
self.obj = obj
self.details_arg = details_arg
class Publication(object):
"""
Object representing a publication (feedback from publishing an event when doing
an acknowledged publish).
This class implements :class:`autobahn.wamp.interfaces.IPublication`.
"""
def __init__(self, publication_id):
self.id = publication_id
def __str__(self):
return "Publication(id={0})".format(self.id)
IPublication.register(Publication)
class Registration(object):
"""
Object representing a registration.
This class implements :class:`autobahn.wamp.interfaces.IRegistration`.
"""
def __init__(self, session, registration_id, procedure, endpoint):
self.id = registration_id
self.active = True
self.session = session
self.procedure = procedure
self.endpoint = endpoint
def unregister(self):
"""
Implements :func:`autobahn.wamp.interfaces.IRegistration.unregister`
"""
if self.active:
return self.session._unregister(self)
else:
raise Exception("registration no longer active")
IRegistration.register(Registration)
class Endpoint(object):
"""
Object representing an procedure endpoint attached to a registration.
"""
def __init__(self, fn, obj=None, details_arg=None):
"""
:param fn: The endpoint procedure to be called.
:type fn: callable
:param obj: The (optional) object upon which to call the function.
:type obj: obj or None
:param details_arg: The keyword argument under which call details should be provided.
:type details_arg: str or None
"""
self.fn = fn
self.obj = obj
self.details_arg = details_arg
class BaseSession(object):
"""
WAMP session base class.
This class implements :class:`autobahn.wamp.interfaces.ISession`.
"""
def __init__(self):
"""
"""
# this is for library level debugging
self.debug = False
# this is for app level debugging. exceptions raised in user code
# will get logged (that is, when invoking remoted procedures or
# when invoking event handlers)
self.debug_app = False
# this is for marshalling traceback from exceptions thrown in user
# code within WAMP error messages (that is, when invoking remoted
# procedures)
self.traceback_app = False
# mapping of exception classes to WAMP error URIs
self._ecls_to_uri_pat = {}
# mapping of WAMP error URIs to exception classes
self._uri_to_ecls = {
ApplicationError.INVALID_PAYLOAD: SerializationError
}
# session authentication information
self._authid = None
self._authrole = None
self._authmethod = None
self._authprovider = None
def onConnect(self):
"""
Implements :func:`autobahn.wamp.interfaces.ISession.onConnect`
"""
def onJoin(self, details):
"""
Implements :func:`autobahn.wamp.interfaces.ISession.onJoin`
"""
def onLeave(self, details):
"""
Implements :func:`autobahn.wamp.interfaces.ISession.onLeave`
"""
def onDisconnect(self):
"""
Implements :func:`autobahn.wamp.interfaces.ISession.onDisconnect`
"""
def define(self, exception, error=None):
"""
Implements :func:`autobahn.wamp.interfaces.ISession.define`
"""
if error is None:
assert(hasattr(exception, '_wampuris'))
self._ecls_to_uri_pat[exception] = exception._wampuris
self._uri_to_ecls[exception._wampuris[0].uri()] = exception
else:
assert(not hasattr(exception, '_wampuris'))
self._ecls_to_uri_pat[exception] = [uri.Pattern(six.u(error), uri.Pattern.URI_TARGET_HANDLER)]
self._uri_to_ecls[six.u(error)] = exception
def _message_from_exception(self, request_type, request, exc, tb=None):
"""
Create a WAMP error message from an exception.
:param request_type: The request type this WAMP error message is for.
:type request_type: int
:param request: The request ID this WAMP error message is for.
:type request: int
:param exc: The exception.
:type exc: Instance of :class:`Exception` or subclass thereof.
:param tb: Optional traceback. If present, it'll be included with the WAMP error message.
:type tb: list or None
"""
args = None
if hasattr(exc, 'args'):
args = list(exc.args) # make sure tuples are made into lists
kwargs = None
if hasattr(exc, 'kwargs'):
kwargs = exc.kwargs
if tb:
if kwargs:
kwargs['traceback'] = tb
else:
kwargs = {'traceback': tb}
if isinstance(exc, exception.ApplicationError):
error = exc.error if type(exc.error) == six.text_type else six.u(exc.error)
else:
if exc.__class__ in self._ecls_to_uri_pat:
error = self._ecls_to_uri_pat[exc.__class__][0]._uri
else:
error = u"wamp.error.runtime_error"
msg = message.Error(request_type, request, error, args, kwargs)
return msg
def _exception_from_message(self, msg):
"""
Create a user (or generic) exception from a WAMP error message.
:param msg: A WAMP error message.
:type msg: instance of :class:`autobahn.wamp.message.Error`
"""
# FIXME:
# 1. map to ecls based on error URI wildcard/prefix
# 2. extract additional args/kwargs from error URI
exc = None
if msg.error in self._uri_to_ecls:
ecls = self._uri_to_ecls[msg.error]
try:
# the following might fail, eg. TypeError when
# signature of exception constructor is incompatible
# with args/kwargs or when the exception constructor raises
if msg.kwargs:
if msg.args:
exc = ecls(*msg.args, **msg.kwargs)
else:
exc = ecls(**msg.kwargs)
else:
if msg.args:
exc = ecls(*msg.args)
else:
exc = ecls()
except Exception as e:
try:
self.onUserError(e, "While re-constructing exception")
except:
pass
if not exc:
# the following ctor never fails ..
if msg.kwargs:
if msg.args:
exc = exception.ApplicationError(msg.error, *msg.args, **msg.kwargs)
else:
exc = exception.ApplicationError(msg.error, **msg.kwargs)
else:
if msg.args:
exc = exception.ApplicationError(msg.error, *msg.args)
else:
exc = exception.ApplicationError(msg.error)
return exc
ISession.register(BaseSession)
class ApplicationSession(BaseSession):
"""
WAMP endpoint session. This class implements
* :class:`autobahn.wamp.interfaces.IPublisher`
* :class:`autobahn.wamp.interfaces.ISubscriber`
* :class:`autobahn.wamp.interfaces.ICaller`
* :class:`autobahn.wamp.interfaces.ICallee`
* :class:`autobahn.wamp.interfaces.ITransportHandler`
"""
def __init__(self, config=None):
"""
Constructor.
"""
BaseSession.__init__(self)
self.config = config or types.ComponentConfig(realm=u"default")
self._transport = None
self._session_id = None
self._realm = None
self._session_id = None
self._goodbye_sent = False
self._transport_is_closing = False
# outstanding requests
self._publish_reqs = {}
self._subscribe_reqs = {}
self._unsubscribe_reqs = {}
self._call_reqs = {}
self._register_reqs = {}
self._unregister_reqs = {}
# subscriptions in place
self._subscriptions = {}
# registrations in place
self._registrations = {}
# incoming invocations
self._invocations = {}
def onOpen(self, transport):
"""
Implements :func:`autobahn.wamp.interfaces.ITransportHandler.onOpen`
"""
self._transport = transport
d = txaio.as_future(self.onConnect)
def _error(e):
return self._swallow_error(e, "While firing onConnect")
txaio.add_callbacks(d, None, _error)
def onConnect(self):
"""
Implements :func:`autobahn.wamp.interfaces.ISession.onConnect`
"""
self.join(self.config.realm)
def join(self, realm, authmethods=None, authid=None):
"""
Implements :func:`autobahn.wamp.interfaces.ISession.join`
"""
if six.PY2 and type(realm) == str:
realm = six.u(realm)
if six.PY2 and type(authid) == str:
authid = six.u(authid)
if self._session_id:
raise Exception("already joined")
self._goodbye_sent = False
msg = message.Hello(realm, role.DEFAULT_CLIENT_ROLES, authmethods, authid)
self._realm = realm
self._transport.send(msg)
def disconnect(self):
"""
Implements :func:`autobahn.wamp.interfaces.ISession.disconnect`
"""
if self._transport:
self._transport.close()
else:
# XXX or shall we just ignore this?
raise RuntimeError("No transport, but disconnect() called.")
def onUserError(self, e, msg):
"""
This is called when we try to fire a callback, but get an
exception from user code -- for example, a registered publish
callback or a registered method. By default, this prints the
current stack-trace and then error-message to stdout.
ApplicationSession-derived objects may override this to
provide logging if they prefer. The Twisted implemention does
this. (See :class:`autobahn.twisted.wamp.ApplicationSession`)
:param e: the Exception we caught.
:param msg: an informative message from the library. It is
suggested you log this immediately after the exception.
"""
traceback.print_exc()
print(msg)
def _swallow_error(self, fail, msg):
'''
This is an internal generic error-handler for errors encountered
when calling down to on*() handlers that can reasonably be
expected to be overridden in user code.
Note that it *cancels* the error, so use with care!
Specifically, this should *never* be added to the errback
chain for a Deferred/coroutine that will make it out to user
code.
'''
# print("_swallow_error", typ, exc, tb)
try:
self.onUserError(fail.value, msg)
except:
pass
return None
def onMessage(self, msg):
"""
Implements :func:`autobahn.wamp.interfaces.ITransportHandler.onMessage`
"""
if self._session_id is None:
# the first message must be WELCOME, ABORT or CHALLENGE ..
if isinstance(msg, message.Welcome):
self._session_id = msg.session
details = SessionDetails(self._realm, self._session_id, msg.authid, msg.authrole, msg.authmethod)
d = txaio.as_future(self.onJoin, details)
def _error(e):
return self._swallow_error(e, "While firing onJoin")
txaio.add_callbacks(d, None, _error)
elif isinstance(msg, message.Abort):
# fire callback and close the transport
details = types.CloseDetails(msg.reason, msg.message)
d = txaio.as_future(self.onLeave, details)
def _error(e):
return self._swallow_error(e, "While firing onLeave")
txaio.add_callbacks(d, None, _error)
elif isinstance(msg, message.Challenge):
challenge = types.Challenge(msg.method, msg.extra)
d = txaio.as_future(self.onChallenge, challenge)
def success(signature):
reply = message.Authenticate(signature)
self._transport.send(reply)
def error(err):
reply = message.Abort(u"wamp.error.cannot_authenticate", u"{0}".format(err.value))
self._transport.send(reply)
# fire callback and close the transport
details = types.CloseDetails(reply.reason, reply.message)
d = txaio.as_future(self.onLeave, details)
def _error(e):
return self._swallow_error(e, "While firing onLeave")
txaio.add_callbacks(d, None, _error)
# switching to the callback chain, effectively
# cancelling error (which we've now handled)
return d
txaio.add_callbacks(d, success, error)
else:
raise ProtocolError("Received {0} message, and session is not yet established".format(msg.__class__))
else:
# self._session_id != None (aka "session established")
if isinstance(msg, message.Goodbye):
if not self._goodbye_sent:
# the peer wants to close: send GOODBYE reply
reply = message.Goodbye()
self._transport.send(reply)
self._session_id = None
# fire callback and close the transport
details = types.CloseDetails(msg.reason, msg.message)
d = txaio.as_future(self.onLeave, details)
def _error(e):
errmsg = 'While firing onLeave for reason "{0}" and message "{1}"'.format(msg.reason, msg.message)
return self._swallow_error(e, errmsg)
txaio.add_callbacks(d, None, _error)
elif isinstance(msg, message.Event):
if msg.subscription in self._subscriptions:
# fire all event handlers on subscription ..
for subscription in self._subscriptions[msg.subscription]:
handler = subscription.handler
invoke_args = (handler.obj,) if handler.obj else tuple()
if msg.args:
invoke_args = invoke_args + tuple(msg.args)
invoke_kwargs = msg.kwargs if msg.kwargs else dict()
if handler.details_arg:
invoke_kwargs[handler.details_arg] = types.EventDetails(publication=msg.publication, publisher=msg.publisher, topic=msg.topic)
try:
handler.fn(*invoke_args, **invoke_kwargs)
except Exception as e:
msg = 'While firing {0} subscribed under {1}.'.format(
handler.fn, msg.subscription)
try:
self.onUserError(e, msg)
except:
pass
else:
raise ProtocolError("EVENT received for non-subscribed subscription ID {0}".format(msg.subscription))
elif isinstance(msg, message.Published):
if msg.request in self._publish_reqs:
# get and pop outstanding publish request
publish_request = self._publish_reqs.pop(msg.request)
# create a new publication object
publication = Publication(msg.publication)
# resolve deferred/future for publishing successfully
txaio.resolve(publish_request.on_reply, publication)
else:
raise ProtocolError("PUBLISHED received for non-pending request ID {0}".format(msg.request))
elif isinstance(msg, message.Subscribed):
if msg.request in self._subscribe_reqs:
# get and pop outstanding subscribe request
request = self._subscribe_reqs.pop(msg.request)
# create new handler subscription list for subscription ID if not yet tracked
if msg.subscription not in self._subscriptions:
self._subscriptions[msg.subscription] = []
subscription = Subscription(msg.subscription, self, request.handler)
# add handler to existing subscription
self._subscriptions[msg.subscription].append(subscription)
# resolve deferred/future for subscribing successfully
txaio.resolve(request.on_reply, subscription)
else:
raise ProtocolError("SUBSCRIBED received for non-pending request ID {0}".format(msg.request))
elif isinstance(msg, message.Unsubscribed):
if msg.request in self._unsubscribe_reqs:
# get and pop outstanding subscribe request
request = self._unsubscribe_reqs.pop(msg.request)
# if the subscription still exists, mark as inactive and remove ..
if request.subscription_id in self._subscriptions:
for subscription in self._subscriptions[request.subscription_id]:
subscription.active = False
del self._subscriptions[request.subscription_id]
# resolve deferred/future for unsubscribing successfully
txaio.resolve(request.on_reply, 0)
else:
raise ProtocolError("UNSUBSCRIBED received for non-pending request ID {0}".format(msg.request))
elif isinstance(msg, message.Result):
if msg.request in self._call_reqs:
if msg.progress:
# progressive result
call_request = self._call_reqs[msg.request]
if call_request.options.on_progress:
kw = msg.kwargs or dict()
args = msg.args or tuple()
try:
# XXX what if on_progress returns a Deferred/Future?
call_request.options.on_progress(*args, **kw)
except Exception as e:
try:
self.onUserError(e, "While firing on_progress")
except:
pass
else:
# silently ignore progressive results
pass
else:
# final result
#
call_request = self._call_reqs.pop(msg.request)
on_reply = call_request.on_reply
if msg.kwargs:
if msg.args:
res = types.CallResult(*msg.args, **msg.kwargs)
else:
res = types.CallResult(**msg.kwargs)
txaio.resolve(on_reply, res)
else:
if msg.args:
if len(msg.args) > 1:
res = types.CallResult(*msg.args)
txaio.resolve(on_reply, res)
else:
txaio.resolve(on_reply, msg.args[0])
else:
txaio.resolve(on_reply, None)
else:
raise ProtocolError("RESULT received for non-pending request ID {0}".format(msg.request))
elif isinstance(msg, message.Invocation):
if msg.request in self._invocations:
raise ProtocolError("INVOCATION received for request ID {0} already invoked".format(msg.request))
else:
if msg.registration not in self._registrations:
raise ProtocolError("INVOCATION received for non-registered registration ID {0}".format(msg.registration))
else:
registration = self._registrations[msg.registration]
endpoint = registration.endpoint
if endpoint.obj:
invoke_args = (endpoint.obj,)
else:
invoke_args = tuple()
if msg.args:
invoke_args = invoke_args + tuple(msg.args)
invoke_kwargs = msg.kwargs if msg.kwargs else dict()
if endpoint.details_arg:
if msg.receive_progress:
def progress(*args, **kwargs):
progress_msg = message.Yield(msg.request, args=args, kwargs=kwargs, progress=True)
self._transport.send(progress_msg)
else:
progress = None
invoke_kwargs[endpoint.details_arg] = types.CallDetails(progress, caller=msg.caller, procedure=msg.procedure)
on_reply = txaio.as_future(endpoint.fn, *invoke_args, **invoke_kwargs)
def success(res):
del self._invocations[msg.request]
if isinstance(res, types.CallResult):
reply = message.Yield(msg.request, args=res.results, kwargs=res.kwresults)
else:
reply = message.Yield(msg.request, args=[res])
try:
self._transport.send(reply)
except SerializationError as e:
# the application-level payload returned from the invoked procedure can't be serialized
reply = message.Error(message.Invocation.MESSAGE_TYPE, msg.request, ApplicationError.INVALID_PAYLOAD,
args=[u'success return value from invoked procedure "{0}" could not be serialized: {1}'.format(registration.procedure, e)])
self._transport.send(reply)
def error(err):
errmsg = 'Failure while invoking procedure {0} registered under "{1}".'.format(endpoint.fn, registration.procedure)
try:
self.onUserError(err, errmsg)
except:
pass
formatted_tb = None
if self.traceback_app:
# if asked to marshal the traceback within the WAMP error message, extract it
# noinspection PyCallingNonCallable
tb = StringIO()
err.printTraceback(file=tb)
formatted_tb = tb.getvalue().splitlines()
del self._invocations[msg.request]
if hasattr(err, 'value'):
exc = err.value
else:
exc = err
reply = self._message_from_exception(message.Invocation.MESSAGE_TYPE, msg.request, exc, formatted_tb)
try:
self._transport.send(reply)
except SerializationError as e:
# the application-level payload returned from the invoked procedure can't be serialized
reply = message.Error(message.Invocation.MESSAGE_TYPE, msg.request, ApplicationError.INVALID_PAYLOAD,
args=[u'error return value from invoked procedure "{0}" could not be serialized: {1}'.format(registration.procedure, e)])
self._transport.send(reply)
# we have handled the error, so we eat it
return None
self._invocations[msg.request] = InvocationRequest(msg.request, on_reply)
txaio.add_callbacks(on_reply, success, error)
elif isinstance(msg, message.Interrupt):
if msg.request not in self._invocations:
raise ProtocolError("INTERRUPT received for non-pending invocation {0}".format(msg.request))
else:
# noinspection PyBroadException
try:
self._invocations[msg.request].cancel()
except Exception as e:
# XXX can .cancel() return a Deferred/Future?
try:
self.onUserError(e, "While cancelling call.")
except:
pass
finally:
del self._invocations[msg.request]
elif isinstance(msg, message.Registered):
if msg.request in self._register_reqs:
# get and pop outstanding register request
request = self._register_reqs.pop(msg.request)
# create new registration if not yet tracked
if msg.registration not in self._registrations:
registration = Registration(self, msg.registration, request.procedure, request.endpoint)
self._registrations[msg.registration] = registration
else:
raise ProtocolError("REGISTERED received for already existing registration ID {0}".format(msg.registration))
txaio.resolve(request.on_reply, registration)
else:
raise ProtocolError("REGISTERED received for non-pending request ID {0}".format(msg.request))
elif isinstance(msg, message.Unregistered):
if msg.request in self._unregister_reqs:
# get and pop outstanding subscribe request
request = self._unregister_reqs.pop(msg.request)
# if the registration still exists, mark as inactive and remove ..
if request.registration_id in self._registrations:
self._registrations[request.registration_id].active = False
del self._registrations[request.registration_id]
# resolve deferred/future for unregistering successfully
txaio.resolve(request.on_reply)
else:
raise ProtocolError("UNREGISTERED received for non-pending request ID {0}".format(msg.request))
elif isinstance(msg, message.Error):
# remove outstanding request and get the reply deferred/future
on_reply = None
# ERROR reply to CALL
if msg.request_type == message.Call.MESSAGE_TYPE and msg.request in self._call_reqs:
on_reply = self._call_reqs.pop(msg.request).on_reply
# ERROR reply to PUBLISH
elif msg.request_type == message.Publish.MESSAGE_TYPE and msg.request in self._publish_reqs:
on_reply = self._publish_reqs.pop(msg.request).on_reply
# ERROR reply to SUBSCRIBE
elif msg.request_type == message.Subscribe.MESSAGE_TYPE and msg.request in self._subscribe_reqs:
on_reply = self._subscribe_reqs.pop(msg.request).on_reply
# ERROR reply to UNSUBSCRIBE
elif msg.request_type == message.Unsubscribe.MESSAGE_TYPE and msg.request in self._unsubscribe_reqs:
on_reply = self._unsubscribe_reqs.pop(msg.request).on_reply
# ERROR reply to REGISTER
elif msg.request_type == message.Register.MESSAGE_TYPE and msg.request in self._register_reqs:
on_reply = self._register_reqs.pop(msg.request).on_reply
# ERROR reply to UNREGISTER
elif msg.request_type == message.Unregister.MESSAGE_TYPE and msg.request in self._unregister_reqs:
on_reply = self._unregister_reqs.pop(msg.request).on_reply
if on_reply:
txaio.reject(on_reply, self._exception_from_message(msg))
else:
raise ProtocolError("WampAppSession.onMessage(): ERROR received for non-pending request_type {0} and request ID {1}".format(msg.request_type, msg.request))
else:
raise ProtocolError("Unexpected message {0}".format(msg.__class__))
# noinspection PyUnusedLocal
def onClose(self, wasClean):
"""
Implements :func:`autobahn.wamp.interfaces.ITransportHandler.onClose`
"""
self._transport = None
if self._session_id:
# fire callback and close the transport
d = txaio.as_future(self.onLeave, types.CloseDetails(reason=types.CloseDetails.REASON_TRANSPORT_LOST, message="WAMP transport was lost without closing the session before"))
def _error(e):
return self._swallow_error(e, "While firing onLeave")
txaio.add_callbacks(d, None, _error)
self._session_id = None
d = txaio.as_future(self.onDisconnect)
def _error(e):
return self._swallow_error(e, "While firing onDisconnect")
txaio.add_callbacks(d, None, _error)
def onChallenge(self, challenge):
"""
Implements :func:`autobahn.wamp.interfaces.ISession.onChallenge`
"""
raise Exception("received authentication challenge, but onChallenge not implemented")
def onJoin(self, details):
"""
Implements :func:`autobahn.wamp.interfaces.ISession.onJoin`
"""
def onLeave(self, details):
"""
Implements :func:`autobahn.wamp.interfaces.ISession.onLeave`
"""
if self._transport:
self.disconnect()
# do we ever call onLeave with a valid transport?
def leave(self, reason=None, log_message=None):
"""
Implements :func:`autobahn.wamp.interfaces.ISession.leave`
"""
if not self._session_id:
raise Exception("not joined")
if not self._goodbye_sent:
if not reason:
reason = u"wamp.close.normal"
msg = wamp.message.Goodbye(reason=reason, message=log_message)
self._transport.send(msg)
self._goodbye_sent = True
else:
raise SessionNotReady(u"Already requested to close the session")
def publish(self, topic, *args, **kwargs):
"""
Implements :func:`autobahn.wamp.interfaces.IPublisher.publish`
"""
if six.PY2 and type(topic) == str:
topic = six.u(topic)
assert(type(topic) == six.text_type)
if not self._transport:
raise exception.TransportLost()
request_id = util.id()
if 'options' in kwargs and isinstance(kwargs['options'], types.PublishOptions):
options = kwargs.pop('options')
msg = message.Publish(request_id, topic, args=args, kwargs=kwargs, **options.message_attr())
else:
options = None
msg = message.Publish(request_id, topic, args=args, kwargs=kwargs)
if options and options.acknowledge:
# only acknowledged publications expect a reply ..
on_reply = txaio.create_future()
self._publish_reqs[request_id] = PublishRequest(request_id, on_reply)
else:
on_reply = None
try:
# Notes:
#
# * this might raise autobahn.wamp.exception.SerializationError
# when the user payload cannot be serialized
# * we have to setup a PublishRequest() in _publish_reqs _before_
# calling transpor.send(), because a mock- or side-by-side transport
# will immediately lead on an incoming WAMP message in onMessage()
#
self._transport.send(msg)
except Exception as e:
if request_id in self._publish_reqs:
del self._publish_reqs[request_id]
raise e
return on_reply
def subscribe(self, handler, topic=None, options=None):
"""
Implements :func:`autobahn.wamp.interfaces.ISubscriber.subscribe`
"""
assert((callable(handler) and topic is not None) or hasattr(handler, '__class__'))
if topic and six.PY2 and type(topic) == str:
topic = six.u(topic)
assert(topic is None or type(topic) == six.text_type)
assert(options is None or isinstance(options, types.SubscribeOptions))
if not self._transport:
raise exception.TransportLost()
def _subscribe(obj, fn, topic, options):
request_id = util.id()
on_reply = txaio.create_future()
handler_obj = Handler(fn, obj, options.details_arg if options else None)
self._subscribe_reqs[request_id] = SubscribeRequest(request_id, on_reply, handler_obj)
if options:
msg = message.Subscribe(request_id, topic, **options.message_attr())
else:
msg = message.Subscribe(request_id, topic)
self._transport.send(msg)
return on_reply
if callable(handler):
# subscribe a single handler
return _subscribe(None, handler, topic, options)
else:
# subscribe all methods on an object decorated with "wamp.subscribe"
on_replies = []
for k in inspect.getmembers(handler.__class__, is_method_or_function):
proc = k[1]
if "_wampuris" in proc.__dict__:
pat = proc.__dict__["_wampuris"][0]
if pat.is_handler():
uri = pat.uri()
subopts = options or pat.subscribe_options()
on_replies.append(_subscribe(handler, proc, uri, subopts))
# XXX needs coverage
return txaio.gather(on_replies, consume_exceptions=True)
def _unsubscribe(self, subscription):
"""
Called from :meth:`autobahn.wamp.protocol.Subscription.unsubscribe`
"""
assert(isinstance(subscription, Subscription))
assert subscription.active
assert(subscription.id in self._subscriptions)
assert(subscription in self._subscriptions[subscription.id])
if not self._transport:
raise exception.TransportLost()
# remove handler subscription and mark as inactive
self._subscriptions[subscription.id].remove(subscription)
subscription.active = False
# number of handler subscriptions left ..
scount = len(self._subscriptions[subscription.id])
if scount == 0:
# if the last handler was removed, unsubscribe from broker ..
request_id = util.id()
on_reply = txaio.create_future()
self._unsubscribe_reqs[request_id] = UnsubscribeRequest(request_id, on_reply, subscription.id)
msg = message.Unsubscribe(request_id, subscription.id)
self._transport.send(msg)
return on_reply
else:
# there are still handlers active on the subscription!
return txaio.create_future_success(scount)
def call(self, procedure, *args, **kwargs):
"""
Implements :func:`autobahn.wamp.interfaces.ICaller.call`
"""
if six.PY2 and type(procedure) == str:
procedure = six.u(procedure)
assert(isinstance(procedure, six.text_type))
if not self._transport:
raise exception.TransportLost()
request_id = util.id()
if 'options' in kwargs and isinstance(kwargs['options'], types.CallOptions):
options = kwargs.pop('options')
msg = message.Call(request_id, procedure, args=args, kwargs=kwargs, **options.message_attr())
else:
options = None
msg = message.Call(request_id, procedure, args=args, kwargs=kwargs)
# FIXME
# def canceller(_d):
# cancel_msg = message.Cancel(request)
# self._transport.send(cancel_msg)
# d = Deferred(canceller)
on_reply = txaio.create_future()
self._call_reqs[request_id] = CallRequest(request_id, on_reply, options)
try:
# Notes:
#
# * this might raise autobahn.wamp.exception.SerializationError
# when the user payload cannot be serialized
# * we have to setup a PublishRequest() in _publish_reqs _before_
# calling transpor.send(), because a mock- or side-by-side transport
# will immediately lead on an incoming WAMP message in onMessage()
#
self._transport.send(msg)
except Exception as e:
if request_id in self._call_reqs:
del self._call_reqs[request_id]
raise e
return on_reply
def register(self, endpoint, procedure=None, options=None):
"""
Implements :func:`autobahn.wamp.interfaces.ICallee.register`
"""
assert((callable(endpoint) and procedure is not None) or hasattr(endpoint, '__class__'))
if procedure and six.PY2 and type(procedure) == str:
procedure = six.u(procedure)
assert(procedure is None or type(procedure) == six.text_type)
assert(options is None or isinstance(options, types.RegisterOptions))
if not self._transport:
raise exception.TransportLost()
def _register(obj, fn, procedure, options):
request_id = util.id()
on_reply = txaio.create_future()
endpoint_obj = Endpoint(fn, obj, options.details_arg if options else None)
self._register_reqs[request_id] = RegisterRequest(request_id, on_reply, procedure, endpoint_obj)
if options:
msg = message.Register(request_id, procedure, **options.message_attr())
else:
msg = message.Register(request_id, procedure)
self._transport.send(msg)
return on_reply
if callable(endpoint):
# register a single callable
return _register(None, endpoint, procedure, options)
else:
# register all methods on an object decorated with "wamp.register"
on_replies = []
for k in inspect.getmembers(endpoint.__class__, is_method_or_function):
proc = k[1]
if "_wampuris" in proc.__dict__:
pat = proc.__dict__["_wampuris"][0]
if pat.is_endpoint():
uri = pat.uri()
on_replies.append(_register(endpoint, proc, uri, options))
# XXX neds coverage
return txaio.gather(on_replies, consume_exceptions=True)
def _unregister(self, registration):
"""
Called from :meth:`autobahn.wamp.protocol.Registration.unregister`
"""
assert(isinstance(registration, Registration))
assert registration.active
assert(registration.id in self._registrations)
if not self._transport:
raise exception.TransportLost()
request_id = util.id()
on_reply = txaio.create_future()
self._unregister_reqs[request_id] = UnregisterRequest(request_id, on_reply, registration.id)
msg = message.Unregister(request_id, registration.id)
self._transport.send(msg)
return on_reply
IPublisher.register(ApplicationSession)
ISubscriber.register(ApplicationSession)
ICaller.register(ApplicationSession)
# ICallee.register(ApplicationSession) # FIXME: ".register" collides with the ABC "register" method
ITransportHandler.register(ApplicationSession)
class ApplicationSessionFactory(object):
"""
WAMP endpoint session factory.
"""
session = ApplicationSession
"""
WAMP application session class to be used in this factory.
"""
def __init__(self, config=None):
"""
:param config: The default component configuration.
:type config: instance of :class:`autobahn.wamp.types.ComponentConfig`
"""
self.config = config or types.ComponentConfig(realm=u"default")
def __call__(self):
"""
Creates a new WAMP application session.
:returns: -- An instance of the WAMP application session class as
given by `self.session`.
"""
session = self.session(self.config)
session.factory = self
return session
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