114 lines
3.8 KiB
Python
114 lines
3.8 KiB
Python
# -*- coding: utf-8 -*-
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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 oslo_config import cfg
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from oslo_context import context
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import oslo_messaging
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from oslo_serialization import jsonutils
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DEFAULT_URL = "__default__"
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TRANSPORTS = {}
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_ALIASES = {
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'namos.openstack.common.rpc.impl_kombu': 'rabbit',
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'namos.openstack.common.rpc.impl_qpid': 'qpid',
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'namos.openstack.common.rpc.impl_zmq': 'zmq',
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}
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class RequestContextSerializer(oslo_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, ctxt, entity):
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if not self._base:
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return entity
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return self._base.serialize_entity(ctxt, entity)
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def deserialize_entity(self, ctxt, entity):
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if not self._base:
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return entity
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return self._base.deserialize_entity(ctxt, entity)
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@staticmethod
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def serialize_context(ctxt):
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return ctxt.to_dict()
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@staticmethod
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def deserialize_context(ctxt):
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return context.RequestContext(ctxt)
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class JsonPayloadSerializer(oslo_messaging.NoOpSerializer):
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@classmethod
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def serialize_entity(cls, context, entity):
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return jsonutils.to_primitive(entity, convert_instances=True)
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def get_transport(url=None, optional=False, cache=True):
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"""Initialise the olso.messaging layer."""
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global TRANSPORTS, DEFAULT_URL
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cache_key = url or DEFAULT_URL
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transport = TRANSPORTS.get(cache_key)
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if not transport or not cache:
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try:
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transport = oslo_messaging.get_transport(cfg.CONF, url,
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aliases=_ALIASES)
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except oslo_messaging.InvalidTransportURL as e:
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if not optional or e.url:
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# NOTE(sileht): olso.messaging is configured but unloadable
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# so reraise the exception
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raise
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return None
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else:
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if cache:
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TRANSPORTS[cache_key] = transport
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return transport
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def get_rpc_server(host, exchange, topic, version, endpoint):
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"""Return a configured olso.messaging rpc server."""
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oslo_messaging.set_transport_defaults(exchange)
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target = oslo_messaging.Target(server=host,
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topic=topic,
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version=version)
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serializer = RequestContextSerializer(JsonPayloadSerializer())
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transport = get_transport(optional=True)
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return oslo_messaging.get_rpc_server(transport, target,
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[endpoint], executor='eventlet',
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serializer=serializer)
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def get_rpc_client(topic, exchange, version, retry=None, **kwargs):
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"""Return a configured olso.messaging RPCClient."""
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oslo_messaging.set_transport_defaults(exchange)
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target = oslo_messaging.Target(version=version,
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topic=topic, **kwargs)
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serializer = RequestContextSerializer(JsonPayloadSerializer())
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transport = get_transport(optional=True)
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return oslo_messaging.RPCClient(transport, target,
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serializer=serializer,
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retry=retry,
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version_cap=version)
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def cleanup():
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"""Cleanup the olso.messaging layer."""
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global TRANSPORTS
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for url in TRANSPORTS:
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TRANSPORTS[url].cleanup()
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del TRANSPORTS[url]
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