104 lines
3.5 KiB
Python
104 lines
3.5 KiB
Python
# Copyright 2014 - Rackspace Hosting
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Common RPC service and API tools for Magnum."""
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import eventlet
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from oslo_config import cfg
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import oslo_messaging as messaging
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import magnum.common.context
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from magnum.objects import base as objects_base
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# NOTE(paulczar):
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# Ubuntu 14.04 forces librabbitmq when kombu is used
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# Unfortunately it forces a version that has a crash
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# bug. Calling eventlet.monkey_patch() tells kombu
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# to use libamqp instead.
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eventlet.monkey_patch()
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# NOTE(asalkeld):
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# The magnum.openstack.common.rpc entries are for compatability
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# with devstack rpc_backend configuration values.
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TRANSPORT_ALIASES = {
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'magnum.openstack.common.rpc.impl_kombu': 'rabbit',
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'magnum.openstack.common.rpc.impl_qpid': 'qpid',
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'magnum.openstack.common.rpc.impl_zmq': 'zmq',
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}
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class RequestContextSerializer(messaging.Serializer):
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def __init__(self, base):
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self._base = base
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def serialize_entity(self, context, entity):
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if not self._base:
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return entity
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return self._base.serialize_entity(context, entity)
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def deserialize_entity(self, context, entity):
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if not self._base:
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return entity
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return self._base.deserialize_entity(context, entity)
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def serialize_context(self, context):
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return context.to_dict()
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def deserialize_context(self, context):
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return magnum.common.context.RequestContext.from_dict(context)
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class Service(object):
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_server = None
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def __init__(self, topic, server, handlers):
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serializer = RequestContextSerializer(
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objects_base.MagnumObjectSerializer())
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transport = messaging.get_transport(cfg.CONF,
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aliases=TRANSPORT_ALIASES)
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# TODO(asalkeld) add support for version='x.y'
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target = messaging.Target(topic=topic, server=server)
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self._server = messaging.get_rpc_server(transport, target, handlers,
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serializer=serializer)
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def serve(self):
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self._server.start()
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self._server.wait()
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class API(object):
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def __init__(self, transport=None, context=None, topic=None):
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serializer = RequestContextSerializer(
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objects_base.MagnumObjectSerializer())
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if transport is None:
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transport = messaging.get_transport(cfg.CONF,
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aliases=TRANSPORT_ALIASES)
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self._context = context
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if topic is None:
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topic = ''
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target = messaging.Target(topic=topic)
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self._client = messaging.RPCClient(transport, target,
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serializer=serializer)
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def _call(self, method, *args, **kwargs):
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return self._client.call(self._context, method, *args, **kwargs)
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def _cast(self, method, *args, **kwargs):
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self._client.cast(self._context, method, *args, **kwargs)
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def echo(self, message):
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self._cast('echo', message=message)
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