116 lines
3.8 KiB
Python
116 lines
3.8 KiB
Python
# Copyright 2012 Managed I.T.
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# Copyright 2014 Hewlett-Packard Development Company, L.P.
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#
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# Author: Kiall Mac Innes <kiall@managedit.ie>
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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 as logging
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import oslo_messaging as messaging
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from designate import notification_handler
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from designate import rpc
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from designate import service
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LOG = logging.getLogger(__name__)
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class Service(service.Service):
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def __init__(self, threads=None):
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super(Service, self).__init__(threads=threads)
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# Initialize extensions
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self.handlers = self._init_extensions()
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self.subscribers = self._get_subscribers()
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@property
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def service_name(self):
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return 'sink'
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def _init_extensions(self):
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"""Loads and prepares all enabled extensions"""
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enabled_notification_handlers = \
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cfg.CONF['service:sink'].enabled_notification_handlers
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notification_handlers = notification_handler.get_notification_handlers(
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enabled_notification_handlers)
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if len(notification_handlers) == 0:
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LOG.warning('No designate-sink handlers enabled or loaded')
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return notification_handlers
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def _get_subscribers(self):
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subscriptions = {}
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for handler in self.handlers:
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for et in handler.get_event_types():
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subscriptions.setdefault(et, [])
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subscriptions[et].append(handler)
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return subscriptions
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def start(self):
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super(Service, self).start()
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# Setup notification subscriptions and start consuming
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targets = self._get_targets()
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# TODO(ekarlso): Change this is to endpoint objects rather then
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# ourselves?
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self._server = rpc.get_listener(targets, [self])
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if len(targets) > 0:
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self._server.start()
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def stop(self):
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# Try to shut the connection down, but if we get any sort of
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# errors, go ahead and ignore them.. as we're shutting down anyway
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try:
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self._server.stop()
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except Exception:
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pass
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super(Service, self).stop()
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def _get_targets(self):
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"""
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Set's up subscriptions for the various exchange+topic combinations that
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we have a handler for.
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"""
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targets = []
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for handler in self.handlers:
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exchange, topics = handler.get_exchange_topics()
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for topic in topics:
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target = messaging.Target(exchange=exchange, topic=topic)
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targets.append(target)
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return targets
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def _get_handler_event_types(self):
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"""return a dict - keys are the event types we can handle"""
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return self.subscribers
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def info(self, context, publisher_id, event_type, payload, metadata):
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"""
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Processes an incoming notification, offering each extension the
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opportunity to handle it.
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"""
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# NOTE(zykes): Only bother to actually do processing if there's any
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# matching events, skips logging of things like compute.exists etc.
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if event_type in self._get_handler_event_types():
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for handler in self.handlers:
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if event_type in handler.get_event_types():
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LOG.debug('Found handler for: %s', event_type)
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handler.process_notification(context, event_type, payload)
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