86 lines
2.8 KiB
Python
86 lines
2.8 KiB
Python
# Copyright 2016 - Nokia
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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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from oslo_log import log
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import oslo_messaging as oslo_msg
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CONF = cfg.CONF
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LOG = log.getLogger(__name__)
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DEFAULT_URL = "__default__"
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TRANSPORTS = {}
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# _SERIALIZER = oslo_serializer.JsonPayloadSerializer()
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def setup():
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# Set the default exchange under which topics are scoped
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oslo_msg.set_transport_defaults('vitrage')
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def get_rpc_transport(url=None, optional=False, cache=True):
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return get_transport(url, optional, cache, rpc=True)
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def get_transport(url=None, optional=False, cache=True, rpc=False):
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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 + '_rpc' if rpc else ''
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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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if rpc:
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transport = oslo_msg.get_rpc_transport(CONF, url)
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else:
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transport = oslo_msg.get_notification_transport(CONF, url)
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except oslo_msg.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 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_msg.get_notification_listener(
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transport, targets, endpoints, executor='blocking',
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allow_requeue=allow_requeue)
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class VitrageNotifier(object):
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"""Allows writing to message bus"""
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def __init__(self, publisher_id, topics):
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transport = get_transport()
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self.notifier = oslo_msg.Notifier(
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transport,
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driver='messagingv2',
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publisher_id=publisher_id,
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topics=topics)
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def notify(self, event_type, data):
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LOG.debug('notify : ' + event_type + ' ' + str(data))
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if self.notifier:
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try:
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self.notifier.info({}, event_type, data)
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except Exception:
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LOG.exception('Notifier cannot notify.')
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else:
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LOG.error('Notifier cannot notify')
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