196 lines
7.9 KiB
Python
196 lines
7.9 KiB
Python
#
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# Copyright 2012-2013 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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import oslo.messaging
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from oslo_config import cfg
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from oslo_context import context
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from stevedore import extension
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from ceilometer import coordination
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from ceilometer.event import endpoint as event_endpoint
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from ceilometer.i18n import _
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from ceilometer import messaging
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from ceilometer.openstack.common import log
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from ceilometer.openstack.common import service as os_service
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from ceilometer import pipeline
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LOG = log.getLogger(__name__)
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OPTS = [
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cfg.BoolOpt('ack_on_event_error',
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default=True,
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deprecated_group='collector',
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help='Acknowledge message when event persistence fails.'),
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cfg.BoolOpt('store_events',
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deprecated_group='collector',
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default=False,
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help='Save event details.'),
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cfg.BoolOpt('workload_partitioning',
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default=False,
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help='Enable workload partitioning, allowing multiple '
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'notification agents to be run simultaneously.'),
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cfg.MultiStrOpt('messaging_urls',
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default=[],
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help="Messaging URLs to listen for notifications. "
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"Example: transport://user:pass@host1:port"
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"[,hostN:portN]/virtual_host "
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"(DEFAULT/transport_url is used if empty)"),
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]
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cfg.CONF.register_opts(OPTS, group="notification")
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cfg.CONF.import_opt('metering_driver', 'ceilometer.publisher.messaging',
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group='publisher_notifier')
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class NotificationService(os_service.Service):
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"""Notification service.
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When running multiple agents, additional queuing sequence is required for
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inter process communication. Each agent has two listeners: one to listen
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to the main OpenStack queue and another listener(and notifier) for IPC to
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divide pipeline sink endpoints. Coordination should be enabled to have
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proper active/active HA.
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"""
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NOTIFICATION_NAMESPACE = 'ceilometer.notification'
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NOTIFICATION_IPC = 'ceilometer-pipe'
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@classmethod
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def _get_notifications_manager(cls, transporter):
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return extension.ExtensionManager(
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namespace=cls.NOTIFICATION_NAMESPACE,
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invoke_on_load=True,
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invoke_args=(transporter, )
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)
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def start(self):
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super(NotificationService, self).start()
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self.pipeline_manager = pipeline.setup_pipeline()
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transport = messaging.get_transport()
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self.partition_coordinator = coordination.PartitionCoordinator()
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self.partition_coordinator.start()
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if cfg.CONF.notification.workload_partitioning:
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transporter = []
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for pipe in self.pipeline_manager.pipelines:
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transporter.append(oslo.messaging.Notifier(
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transport,
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driver=cfg.CONF.publisher_notifier.metering_driver,
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publisher_id='ceilometer.notification',
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topic='%s-%s' % (self.NOTIFICATION_IPC, pipe.name)))
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self.ctxt = context.get_admin_context()
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self.group_id = self.NOTIFICATION_NAMESPACE
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else:
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# FIXME(sileht): endpoint use notification_topics option
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# and it should not because this is oslo.messaging option
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# not a ceilometer, until we have a something to get
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# the notification_topics in an other way
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# we must create a transport to ensure the option have
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# beeen registered by oslo.messaging
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messaging.get_notifier(transport, '')
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transporter = self.pipeline_manager
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self.group_id = None
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self.listeners = self.pipeline_listeners = []
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self._configure_main_queue_listeners(transporter)
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if cfg.CONF.notification.workload_partitioning:
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self.partition_coordinator.join_group(self.group_id)
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self._configure_pipeline_listeners()
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self.partition_coordinator.watch_group(self.group_id,
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self._refresh_agent)
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self.tg.add_timer(cfg.CONF.coordination.heartbeat,
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self.partition_coordinator.heartbeat)
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self.tg.add_timer(cfg.CONF.coordination.check_watchers,
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self.partition_coordinator.run_watchers)
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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 _configure_main_queue_listeners(self, transporter):
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self.notification_manager = self._get_notifications_manager(
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transporter)
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if not list(self.notification_manager):
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LOG.warning(_('Failed to load any notification handlers for %s'),
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self.NOTIFICATION_NAMESPACE)
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ack_on_error = cfg.CONF.notification.ack_on_event_error
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endpoints = []
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if cfg.CONF.notification.store_events:
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endpoints = [event_endpoint.EventsNotificationEndpoint()]
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targets = []
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for ext in self.notification_manager:
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handler = ext.obj
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LOG.debug(_('Event types from %(name)s: %(type)s'
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' (ack_on_error=%(error)s)') %
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{'name': ext.name,
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'type': ', '.join(handler.event_types),
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'error': ack_on_error})
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# NOTE(gordc): this could be a set check but oslo.messaging issue
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# https://bugs.launchpad.net/oslo.messaging/+bug/1398511
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# This ensures we don't create multiple duplicate consumers.
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for new_tar in handler.get_targets(cfg.CONF):
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if new_tar not in targets:
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targets.append(new_tar)
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endpoints.append(handler)
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urls = cfg.CONF.notification.messaging_urls or [None]
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for url in urls:
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transport = messaging.get_transport(url)
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listener = messaging.get_notification_listener(
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transport, targets, endpoints)
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listener.start()
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self.listeners.append(listener)
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@staticmethod
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def _kill_listeners(listeners):
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# NOTE(gordc): correct usage of oslo.messaging listener is to stop(),
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# which stops new messages, and wait(), which processes remaining
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# messages and closes connection
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for listener in listeners:
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listener.stop()
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listener.wait()
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def _refresh_agent(self, event):
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self._kill_listeners(self.pipeline_listeners)
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self._configure_pipeline_listeners()
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def _configure_pipeline_listeners(self):
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self.pipeline_listeners = []
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partitioned = self.partition_coordinator.extract_my_subset(
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self.group_id, self.pipeline_manager.pipelines)
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transport = messaging.get_transport()
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for pipe in partitioned:
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LOG.debug(_('Pipeline endpoint: %s'), pipe.name)
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listener = messaging.get_notification_listener(
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transport,
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[oslo.messaging.Target(
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topic='%s-%s' % (self.NOTIFICATION_IPC, pipe.name))],
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[pipeline.PipelineEndpoint(self.ctxt, pipe)])
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listener.start()
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self.pipeline_listeners.append(listener)
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def stop(self):
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self.partition_coordinator.leave_group(self.group_id)
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self._kill_listeners(self.listeners + self.pipeline_listeners)
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super(NotificationService, self).stop()
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