/usr/lib/python2.7/dist-packages/autobahn/twisted/component.py is in python-autobahn 0.14.1+dfsg1-2.
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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, print_function
import itertools
from twisted.internet.defer import inlineCallbacks
from twisted.internet.interfaces import IStreamClientEndpoint
from twisted.internet.endpoints import UNIXClientEndpoint
from twisted.internet.endpoints import TCP4ClientEndpoint
from twisted.internet.task import react
try:
_TLS = True
from twisted.internet.endpoints import SSL4ClientEndpoint
from twisted.internet.ssl import optionsForClientTLS, CertificateOptions
from twisted.internet.interfaces import IOpenSSLClientComponentCreator
except ImportError:
_TLS = False
import txaio
from autobahn.twisted.websocket import WampWebSocketClientFactory
from autobahn.twisted.rawsocket import WampRawSocketClientFactory
from autobahn.wamp import component
from autobahn.twisted.util import sleep
from autobahn.twisted.wamp import ApplicationSession
__all__ = ('Component')
def _unique_list(seq):
"""
Return a list with unique elements from sequence, preserving order.
"""
seen = set(seq)
return [x for x in seq if x not in seen and not seen.add(x)]
def _create_transport_serializer(serializer_id):
if serializer_id in [u'msgpack', u'mgspack.batched']:
# try MsgPack WAMP serializer
try:
from autobahn.wamp.serializer import MsgPackSerializer
except ImportError:
pass
else:
if serializer_id == u'mgspack.batched':
return MsgPackSerializer(batched=True)
else:
return MsgPackSerializer()
if serializer_id in [u'json', u'json.batched']:
# try JSON WAMP serializer
try:
from autobahn.wamp.serializer import JsonSerializer
except ImportError:
pass
else:
if serializer_id == u'json.batched':
return JsonSerializer(batched=True)
else:
return JsonSerializer()
raise RuntimeError('could not create serializer for "{}"'.format(serializer_id))
def _create_transport_serializers(transport_config):
"""
Create a list of serializers to use with a WAMP protocol factory.
"""
if u'serializers' in transport_config:
serializer_ids = _unique_list(transport_config['serializers'])
else:
serializer_ids = [u'msgpack', u'json']
serializers = []
for serializer_id in serializer_ids:
if serializer_id == u'msgpack':
# try MsgPack WAMP serializer
try:
from autobahn.wamp.serializer import MsgPackSerializer
except ImportError:
pass
else:
serializers.append(MsgPackSerializer(batched=True))
serializers.append(MsgPackSerializer())
if serializer_id == u'json':
# try JSON WAMP serializer
try:
from autobahn.wamp.serializer import JsonSerializer
except ImportError:
pass
else:
serializers.append(JsonSerializer(batched=True))
serializers.append(JsonSerializer())
return serializers
def _create_transport_factory(reactor, transport_config, session_factory):
"""
Create a WAMP-over-XXX transport factory.
"""
if transport_config['type'] == 'websocket':
# FIXME: forward WebSocket options
serializers = _create_transport_serializers(transport_config)
return WampWebSocketClientFactory(session_factory, url=transport_config['url'], serializers=serializers)
elif transport_config['type'] == 'rawsocket':
# FIXME: forward RawSocket options
serializer = _create_transport_serializer(transport_config.get('serializer', u'json'))
return WampRawSocketClientFactory(session_factory, serializer=serializer)
else:
assert(False), 'should not arrive here'
def _create_transport_endpoint(reactor, endpoint_config):
"""
Create a Twisted client endpoint for a WAMP-over-XXX transport.
"""
if IStreamClientEndpoint.providedBy(endpoint_config):
endpoint = IStreamClientEndpoint(endpoint_config)
else:
# create a connecting TCP socket
if endpoint_config['type'] == 'tcp':
version = int(endpoint_config.get('version', 4))
host = str(endpoint_config['host'])
port = int(endpoint_config['port'])
timeout = int(endpoint_config.get('timeout', 10)) # in seconds
tls = endpoint_config.get('tls', None)
# create a TLS enabled connecting TCP socket
if tls:
if not _TLS:
raise RuntimeError('TLS configured in transport, but TLS support is not installed (eg OpenSSL?)')
# FIXME: create TLS context from configuration
if IOpenSSLClientComponentCreator.providedBy(tls):
# eg created from twisted.internet.ssl.optionsForClientTLS()
context = IOpenSSLClientComponentCreator(tls)
elif isinstance(tls, CertificateOptions):
context = tls
elif tls is True:
context = optionsForClientTLS(host)
else:
raise RuntimeError('unknown type {} for "tls" configuration in transport'.format(type(tls)))
if version == 4:
endpoint = SSL4ClientEndpoint(reactor, host, port, context, timeout=timeout)
elif version == 6:
# there is no SSL6ClientEndpoint!
raise RuntimeError('TLS on IPv6 not implemented')
else:
assert(False), 'should not arrive here'
# create a non-TLS connecting TCP socket
else:
if version == 4:
endpoint = TCP4ClientEndpoint(reactor, host, port, timeout=timeout)
elif version == 6:
try:
from twisted.internet.endpoints import TCP6ClientEndpoint
except ImportError:
raise RuntimeError('IPv6 is not supported (please upgrade Twisted)')
endpoint = TCP6ClientEndpoint(reactor, host, port, timeout=timeout)
else:
assert(False), 'should not arrive here'
# create a connecting Unix domain socket
elif endpoint_config['type'] == 'unix':
path = endpoint_config['path']
timeout = int(endpoint_config.get('timeout', 10)) # in seconds
endpoint = UNIXClientEndpoint(reactor, path, timeout=timeout)
else:
assert(False), 'should not arrive here'
return endpoint
class Component(component.Component):
"""
A component establishes a transport and attached a session
to a realm using the transport for communication.
The transports a component tries to use can be configured,
as well as the auto-reconnect strategy.
"""
log = txaio.make_logger()
session = ApplicationSession
"""
The factory of the session we will instantiate.
"""
def _connect_transport(self, reactor, transport_config, session_factory):
"""
Create and connect a WAMP-over-XXX transport.
"""
transport_factory = _create_transport_factory(reactor, transport_config, session_factory)
transport_endpoint = _create_transport_endpoint(reactor, transport_config['endpoint'])
return transport_endpoint.connect(transport_factory)
@inlineCallbacks
def start(self, reactor=None):
if reactor is None:
from twisted.internet import reactor
# txaio.use_twisted()
# txaio.config.loop = reactor
# txaio.start_logging(level='debug')
yield self.fire('start', reactor, self)
# transports to try again and again ..
transport_gen = itertools.cycle(self._transports)
reconnect = True
self.log.info('entering recomponent loop')
while reconnect:
# cycle through all transports forever ..
transport = next(transport_gen)
# only actually try to connect using the transport,
# if the transport hasn't reached max. connect count
if transport.can_reconnect():
delay = transport.next_delay()
self.log.debug(
'trying transport {transport_idx} using connect delay {transport_delay}',
transport_idx=transport.idx,
transport_delay=delay,
)
yield sleep(delay)
try:
transport.connect_attempts += 1
yield self._connect_once(reactor, transport.config)
transport.connect_sucesses += 1
except Exception as e:
transport.connect_failures += 1
self.log.error(u'component failed: {error}', error=e)
else:
reconnect = False
else:
# check if there is any transport left we can use
# to connect
if not self._can_reconnect():
reconnect = False
def _run(reactor, components):
if isinstance(components, Component):
components = [components]
if type(components) != list:
raise RuntimeError('"components" must be a list of Component objects - encountered {0}'.format(type(components)))
for c in components:
if not isinstance(c, Component):
raise RuntimeError('"components" must be a list of Component objects - encountered item of type {0}'.format(type(c)))
# all components are started in parallel
dl = []
for c in components:
# a component can be of type MAIN or SETUP
dl.append(c.start(reactor))
d = txaio.gather(dl, consume_exceptions=True)
return d
def run(components):
react(_run, [components])
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