92 lines
3.3 KiB
Python
92 lines
3.3 KiB
Python
#
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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 as logging
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import oslo_messaging
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from oslo_service import service
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from bilean.common.i18n import _LE
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from bilean.common import messaging as bilean_messaging
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from bilean.engine import environment
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from bilean.notification import endpoint
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LOG = logging.getLogger(__name__)
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listener_opts = [
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cfg.IntOpt('workers',
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default=1,
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min=1,
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help='Number of workers for notification service. A single '
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'notification agent is enabled by default.'),
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cfg.StrOpt('notifications_pool',
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default='bilean-listener',
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help='Use an oslo.messaging pool, which can be an alternative '
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'to multiple topics. ')
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]
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CONF = cfg.CONF
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CONF.register_opts(listener_opts, group="listener")
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class NotificationService(service.Service):
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def __init__(self, *args, **kwargs):
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super(NotificationService, self).__init__(*args, **kwargs)
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self.listeners = []
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self.topics_exchanges_set = self.topics_and_exchanges()
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def topics_and_exchanges(self):
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topics_exchanges = set()
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plugins = environment.global_env().get_plugins()
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for plugin in plugins:
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try:
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topic_exchanges = plugin.get_notification_topics_exchanges()
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for plugin_topic in topic_exchanges:
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if isinstance(plugin_topic, basestring):
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raise Exception(
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_LE("Plugin %s should return a list of topic "
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"exchange pairs") % plugin.__class__.__name__)
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topics_exchanges.add(plugin_topic)
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except Exception as e:
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LOG.error(_LE("Failed to retrieve notification topic(s) "
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"and exchanges from bilean plugin "
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"%(ext)s: %(e)s") %
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{'ext': plugin.__name__, 'e': e})
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return topics_exchanges
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def start(self):
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super(NotificationService, self).start()
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transport = bilean_messaging.get_transport()
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targets = [
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oslo_messaging.Target(topic=tp, exchange=eg)
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for tp, eg in self.topics_exchanges_set
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]
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endpoints = [endpoint.EventsNotificationEndpoint()]
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listener = oslo_messaging.get_notification_listener(
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transport,
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targets,
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endpoints,
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pool=CONF.listener.notifications_pool)
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listener.start()
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self.listeners.append(listener)
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# Add a dummy thread to have wait() working
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self.tg.add_timer(604800, lambda: None)
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def stop(self):
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map(lambda x: x.stop(), self.listeners)
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super(NotificationService, self).stop()
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