111 lines
3.6 KiB
Python
111 lines
3.6 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2013-2015 eNovance <licensing@enovance.com>
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#
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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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import oslo_context.context
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import oslo_messaging
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from oslo_messaging import serializer as oslo_serializer
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DEFAULT_URL = "__default__"
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TRANSPORTS = {}
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def setup():
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oslo_messaging.set_transport_defaults('ceilometer')
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def get_transport(url=None, optional=False, cache=True):
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"""Initialise the oslo_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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except oslo_messaging.InvalidTransportURL as e:
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if not optional or e.url:
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# NOTE(sileht): oslo_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 cleanup():
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"""Cleanup the oslo_messaging layer."""
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global TRANSPORTS, NOTIFIERS
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NOTIFIERS = {}
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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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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, 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 oslo_context.context.RequestContext.from_dict(context)
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_SERIALIZER = RequestContextSerializer(
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oslo_serializer.JsonPayloadSerializer())
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def get_notification_listener(transport, targets, endpoints,
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allow_requeue=False):
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"""Return a configured oslo_messaging notification listener."""
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return oslo_messaging.get_notification_listener(
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transport, targets, endpoints, executor='threading',
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allow_requeue=allow_requeue)
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def get_notifier(transport, publisher_id):
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"""Return a configured oslo_messaging notifier."""
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notifier = oslo_messaging.Notifier(transport, serializer=_SERIALIZER)
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return notifier.prepare(publisher_id=publisher_id)
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def convert_to_old_notification_format(priority, ctxt, publisher_id,
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event_type, payload, metadata):
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# FIXME(sileht): temporary convert notification to old format
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# to focus on oslo_messaging migration before refactoring the code to
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# use the new oslo_messaging facilities
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notification = {'priority': priority,
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'payload': payload,
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'event_type': event_type,
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'publisher_id': publisher_id}
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notification.update(metadata)
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for k in ctxt:
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notification['_context_' + k] = ctxt[k]
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return notification
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