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Diffstat (limited to 'keystone/openstack/common/rpc/service.py')
-rw-r--r-- | keystone/openstack/common/rpc/service.py | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/keystone/openstack/common/rpc/service.py b/keystone/openstack/common/rpc/service.py new file mode 100644 index 00000000..34eacb60 --- /dev/null +++ b/keystone/openstack/common/rpc/service.py @@ -0,0 +1,78 @@ +# vim: tabstop=4 shiftwidth=4 softtabstop=4 + +# 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 keystone.openstack.common.gettextutils import _ # noqa +from keystone.openstack.common import log as logging +from keystone.openstack.common import rpc +from keystone.openstack.common.rpc import dispatcher as rpc_dispatcher +from keystone.openstack.common import service + + +LOG = logging.getLogger(__name__) + + +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, serializer=None): + super(Service, self).__init__() + self.host = host + self.topic = topic + self.serializer = serializer + if manager is None: + self.manager = self + else: + self.manager = manager + + 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], + self.serializer) + + # 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() + + 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() |