cc6eff30d7
This will be used to emulate oslo-rpc API using oslo.messaging. blueprint oslo-messaging Change-Id: I2c1aa159132e4aad0138d4b0b7ff90eb98ed400c
104 lines
3.4 KiB
Python
104 lines
3.4 KiB
Python
# Copyright (c) 2014 Red Hat, Inc.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from neutron.openstack.common import log as logging
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from neutron.openstack.common import rpc
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from neutron.openstack.common.rpc import common as rpc_common
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from neutron.openstack.common.rpc import dispatcher as rpc_dispatcher
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from neutron.openstack.common.rpc import proxy
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from neutron.openstack.common import service
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LOG = logging.getLogger(__name__)
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class RpcProxy(proxy.RpcProxy):
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'''
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This class is created to facilitate migration from oslo-incubator
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RPC layer implementation to oslo.messaging and is intended to
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emulate RpcProxy class behaviour using oslo.messaging API once the
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migration is applied.
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'''
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class RpcCallback(object):
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'''
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This class is created to facilitate migration from oslo-incubator
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RPC layer implementation to oslo.messaging and is intended to set
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callback version using oslo.messaging API once the migration is
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applied.
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'''
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class Service(service.Service):
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"""Service object for binaries running on hosts.
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A service enables rpc by listening to queues based on topic and host.
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"""
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def __init__(self, host, topic, manager=None, serializer=None):
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super(Service, self).__init__()
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self.host = host
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self.topic = topic
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self.serializer = serializer
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if manager is None:
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self.manager = self
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else:
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self.manager = manager
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def start(self):
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super(Service, self).start()
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self.conn = create_connection(new=True)
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LOG.debug("Creating Consumer connection for Service %s" %
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self.topic)
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dispatcher = rpc_dispatcher.RpcDispatcher([self.manager],
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self.serializer)
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# Share this same connection for these Consumers
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self.conn.create_consumer(self.topic, dispatcher, fanout=False)
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node_topic = '%s.%s' % (self.topic, self.host)
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self.conn.create_consumer(node_topic, dispatcher, fanout=False)
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self.conn.create_consumer(self.topic, dispatcher, fanout=True)
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# Hook to allow the manager to do other initializations after
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# the rpc connection is created.
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if callable(getattr(self.manager, 'initialize_service_hook', None)):
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self.manager.initialize_service_hook(self)
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# Consume from all consumers in a thread
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self.conn.consume_in_thread()
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def stop(self):
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# Try to shut the connection down, but if we get any sort of
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# errors, go ahead and ignore them.. as we're shutting down anyway
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try:
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self.conn.close()
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except Exception:
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pass
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super(Service, self).stop()
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# functions
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create_connection = rpc.create_connection
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# exceptions
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RPCException = rpc_common.RPCException
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RemoteError = rpc_common.RemoteError
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MessagingTimeout = rpc_common.Timeout
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