133 lines
4.4 KiB
Python
133 lines
4.4 KiB
Python
# Copyright 2012-2014 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_log import log
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import oslo_messaging
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from stevedore import extension
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from ceilometer import agent
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from ceilometer.event import converter
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from ceilometer.pipeline import base
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LOG = log.getLogger(__name__)
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class EventEndpoint(base.MainNotificationEndpoint):
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event_types = []
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def __init__(self, conf, publisher):
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super(EventEndpoint, self).__init__(conf, publisher)
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LOG.debug('Loading event definitions')
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self.event_converter = converter.setup_events(
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conf,
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extension.ExtensionManager(
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namespace='ceilometer.event.trait_plugin'))
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def info(self, notifications):
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"""Convert message at info level to Ceilometer Event.
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:param notifications: list of notifications
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"""
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return self.process_notifications('info', notifications)
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def error(self, notifications):
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"""Convert message at error level to Ceilometer Event.
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:param notifications: list of notifications
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"""
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return self.process_notifications('error', notifications)
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def process_notifications(self, priority, notifications):
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for message in notifications:
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try:
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event = self.event_converter.to_event(priority, message)
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if event is not None:
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with self.publisher as p:
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p(event)
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except Exception:
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if not self.conf.notification.ack_on_event_error:
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return oslo_messaging.NotificationResult.REQUEUE
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LOG.error('Fail to process a notification', exc_info=True)
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return oslo_messaging.NotificationResult.HANDLED
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class EventSource(base.PipelineSource):
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"""Represents a source of events.
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In effect it is a set of notification handlers capturing events for a set
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of matching notifications.
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"""
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def __init__(self, cfg):
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super(EventSource, self).__init__(cfg)
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self.events = cfg.get('events')
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try:
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self.check_source_filtering(self.events, 'events')
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except agent.SourceException as err:
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raise base.PipelineException(err.msg, cfg)
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def support_event(self, event_name):
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return self.is_supported(self.events, event_name)
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class EventSink(base.Sink):
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def publish_events(self, events):
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if events:
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for p in self.publishers:
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try:
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p.publish_events(events)
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except Exception:
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LOG.error("Pipeline %(pipeline)s: %(status)s "
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"after error from publisher %(pub)s" %
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{'pipeline': self,
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'status': 'Continue' if
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self.multi_publish else 'Exit', 'pub': p},
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exc_info=True)
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if not self.multi_publish:
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raise
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class EventPipeline(base.Pipeline):
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"""Represents a pipeline for Events."""
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def __str__(self):
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# NOTE(gordc): prepend a namespace so we ensure event and sample
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# pipelines do not have the same name.
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return 'event:%s' % super(EventPipeline, self).__str__()
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def publish_data(self, events):
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if not isinstance(events, list):
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events = [events]
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supported = [e for e in events if self.supported(e)]
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self.sink.publish_events(supported)
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def supported(self, event):
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return self.source.support_event(event.event_type)
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class EventPipelineManager(base.PipelineManager):
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pm_type = 'event'
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pm_pipeline = EventPipeline
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pm_source = EventSource
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pm_sink = EventSink
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def __init__(self, conf):
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super(EventPipelineManager, self).__init__(
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conf, conf.event_pipeline_cfg_file)
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def get_main_endpoints(self):
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return [EventEndpoint(self.conf, self.publisher())]
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