144 lines
4.1 KiB
Python
144 lines
4.1 KiB
Python
# Copyright (c) 2013 Mirantis Inc.
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# Copyright (c) 2013 Julien Danjou <julien@danjou.info>
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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
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# 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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from oslo.config import cfg
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from oslo import messaging
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from sahara import context
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from sahara.i18n import _LE
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from sahara.i18n import _LI
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from sahara.openstack.common import jsonutils
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from sahara.openstack.common import log as logging
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TRANSPORT = None
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NOTIFIER = None
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SERIALIZER = None
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CONF = cfg.CONF
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LOG = logging.getLogger(__name__)
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_ALIASES = {
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'sahara.openstack.common.rpc.impl_kombu': 'rabbit',
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'sahara.openstack.common.rpc.impl_qpid': 'qpid',
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'sahara.openstack.common.rpc.impl_zmq': 'zmq',
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}
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class ContextSerializer(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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return self._base.serialize_entity(ctxt, entity)
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def deserialize_entity(self, ctxt, 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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pass
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class JsonPayloadSerializer(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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class RPCClient(object):
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def __init__(self, target):
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self.__client = messaging.RPCClient(
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target=target,
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transport=messaging.get_transport(cfg.CONF),
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)
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def cast(self, name, **kwargs):
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ctx = context.current()
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self.__client.cast(ctx.to_dict(), name, **kwargs)
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def call(self, name, **kwargs):
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ctx = context.current()
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return self.__client.call(ctx.to_dict(), name, **kwargs)
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class RPCServer(object):
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def __init__(self, target):
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self.__server = messaging.get_rpc_server(
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target=target,
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transport=messaging.get_transport(cfg.CONF),
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endpoints=[ContextEndpointHandler(self)],
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executor='eventlet')
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def start(self):
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self.__server.start()
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self.__server.wait()
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class ContextEndpointHandler(object):
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def __init__(self, endpoint):
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self.__endpoint = endpoint
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def __getattr__(self, name):
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try:
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method = getattr(self.__endpoint, name)
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def run_method(ctx, **kwargs):
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context.set_ctx(context.Context(**ctx))
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try:
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return method(**kwargs)
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finally:
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context.set_ctx(None)
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return run_method
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except AttributeError:
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LOG.error(_LE("No %(method)s method found implemented in "
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"%(class)s class"),
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{'method': name, 'class': self.__endpoint})
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def setup(url=None, optional=False):
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"""Initialise the oslo.messaging layer."""
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global TRANSPORT, NOTIFIER, SERIALIZER
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if not cfg.CONF.enable_notifications:
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LOG.info(_LI("Notifications disabled"))
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return
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LOG.info(_LI("Notifications enabled"))
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messaging.set_transport_defaults('sahara')
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SERIALIZER = ContextSerializer(JsonPayloadSerializer())
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try:
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TRANSPORT = messaging.get_transport(cfg.CONF, url,
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aliases=_ALIASES)
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except messaging.InvalidTransportURL as e:
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TRANSPORT = None
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if not optional or e.url:
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raise
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if TRANSPORT:
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NOTIFIER = messaging.Notifier(TRANSPORT, serializer=SERIALIZER)
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def get_notifier(publisher_id):
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"""Return a configured oslo.messaging notifier."""
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return NOTIFIER.prepare(publisher_id=publisher_id)
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