137 lines
4.5 KiB
Python
137 lines
4.5 KiB
Python
# 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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import eventlet
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from oslo_config import cfg
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import oslo_messaging as messaging
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from osprofiler import profiler
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from senlin.common import consts
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from senlin.common import context
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# An alias for the default serializer
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JsonPayloadSerializer = messaging.JsonPayloadSerializer
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TRANSPORT = None
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NOTIFICATION_TRANSPORT = None
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NOTIFIER = None
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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, 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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_context = ctxt.to_dict()
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prof = profiler.get()
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if prof:
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trace_info = {
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"hmac_key": prof.hmac_key,
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"base_id": prof.get_base_id(),
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"parent_id": prof.get_id()
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}
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_context.update({"trace_info": trace_info})
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return _context
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@staticmethod
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def deserialize_context(ctxt):
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trace_info = ctxt.pop("trace_info", None)
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if trace_info:
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profiler.init(**trace_info)
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return context.RequestContext.from_dict(ctxt)
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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, GLOBAL_TRANSPORT, NOTIFIER
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if url and url.startswith("fake://"):
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# NOTE: oslo_messaging fake driver uses time.sleep
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# for task switch, so we need to monkey_patch it
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eventlet.monkey_patch(time=True)
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messaging.set_transport_defaults('senlin')
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if not TRANSPORT:
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exmods = ['senlin.common.exception']
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try:
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TRANSPORT = messaging.get_rpc_transport(
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cfg.CONF, url, allowed_remote_exmods=exmods)
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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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# NOTE: oslo_messaging is configured but unloadable
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# so reraise the exception
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raise
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if not NOTIFIER:
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exmods = ['senlin.common.exception']
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try:
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NOTIFICATION_TRANSPORT = messaging.get_notification_transport(
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cfg.CONF, allowed_remote_exmods=exmods)
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except Exception:
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raise
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serializer = RequestContextSerializer(JsonPayloadSerializer())
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NOTIFIER = messaging.Notifier(NOTIFICATION_TRANSPORT,
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serializer=serializer,
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topics=cfg.CONF.notification_topics)
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def cleanup():
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"""Cleanup the oslo_messaging layer."""
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global TRANSPORT, NOTIFICATION_TRANSPORT, NOTIFIER
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if TRANSPORT:
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TRANSPORT.cleanup()
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TRANSPORT = None
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NOTIFIER = None
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if NOTIFICATION_TRANSPORT:
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NOTIFICATION_TRANSPORT.cleanup()
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NOTIFICATION_TRANSPORT = None
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def get_rpc_server(target, endpoint, serializer=None):
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"""Return a configured oslo_messaging rpc server."""
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if serializer is None:
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serializer = JsonPayloadSerializer()
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serializer = RequestContextSerializer(serializer)
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return messaging.get_rpc_server(TRANSPORT, target, [endpoint],
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executor='eventlet',
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serializer=serializer)
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def get_rpc_client(topic, server, serializer=None):
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"""Return a configured oslo_messaging RPCClient."""
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target = messaging.Target(topic=topic, server=server,
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version=consts.RPC_API_VERSION_BASE)
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if serializer is None:
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serializer = JsonPayloadSerializer()
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serializer = RequestContextSerializer(serializer)
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return messaging.get_rpc_client(
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TRANSPORT, target, 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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global NOTIFIER
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return NOTIFIER.prepare(publisher_id=publisher_id)
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