Source code for openstack_dashboard.openstack.common.rpc.service

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# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# All Rights Reserved.
# Copyright 2011 Red Hat, Inc.
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

from openstack_dashboard.openstack.common.gettextutils import _
from openstack_dashboard.openstack.common import log as logging
from openstack_dashboard.openstack.common import rpc
from openstack_dashboard.openstack.common.rpc import dispatcher as rpc_dispatcher
from openstack_dashboard.openstack.common import service


LOG = logging.getLogger(__name__)


[docs]class Service(service.Service): """Service object for binaries running on hosts. A service enables rpc by listening to queues based on topic and host. """ def __init__(self, host, topic, manager=None): super(Service, self).__init__() self.host = host self.topic = topic if manager is None: self.manager = self else: self.manager = manager
[docs] def start(self): super(Service, self).start() self.conn = rpc.create_connection(new=True) LOG.debug(_("Creating Consumer connection for Service %s") % self.topic) dispatcher = rpc_dispatcher.RpcDispatcher([self.manager]) # Share this same connection for these Consumers self.conn.create_consumer(self.topic, dispatcher, fanout=False) node_topic = '%s.%s' % (self.topic, self.host) self.conn.create_consumer(node_topic, dispatcher, fanout=False) self.conn.create_consumer(self.topic, dispatcher, fanout=True) # Hook to allow the manager to do other initializations after # the rpc connection is created. if callable(getattr(self.manager, 'initialize_service_hook', None)): self.manager.initialize_service_hook(self) # Consume from all consumers in a thread self.conn.consume_in_thread()
[docs] def stop(self): # Try to shut the connection down, but if we get any sort of # errors, go ahead and ignore them.. as we're shutting down anyway try: self.conn.close() except Exception: pass super(Service, self).stop()