222 lines
7.7 KiB
Python
222 lines
7.7 KiB
Python
#
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# Copyright 2012 New Dream Network, LLC (DreamHost)
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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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"""Publish a sample using the preferred RPC mechanism.
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"""
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import abc
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import itertools
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import operator
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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
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from oslo_utils import encodeutils
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from oslo_utils import excutils
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import six
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import six.moves.urllib.parse as urlparse
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from ceilometer.i18n import _, _LE, _LI
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from ceilometer import messaging
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from ceilometer import publisher
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from ceilometer.publisher import utils
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LOG = log.getLogger(__name__)
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NOTIFIER_OPTS = [
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cfg.StrOpt('metering_topic',
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default='metering',
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help='The topic that ceilometer uses for metering '
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'notifications.',
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),
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cfg.StrOpt('event_topic',
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default='event',
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help='The topic that ceilometer uses for event '
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'notifications.',
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),
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cfg.StrOpt('telemetry_driver',
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default='messagingv2',
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help='The driver that ceilometer uses for metering '
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'notifications.',
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deprecated_name='metering_driver',
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)
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]
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cfg.CONF.register_opts(NOTIFIER_OPTS,
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group="publisher_notifier")
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cfg.CONF.import_opt('host', 'ceilometer.service')
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class DeliveryFailure(Exception):
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def __init__(self, message=None, cause=None):
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super(DeliveryFailure, self).__init__(message)
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self.cause = cause
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def raise_delivery_failure(exc):
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excutils.raise_with_cause(DeliveryFailure,
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encodeutils.exception_to_unicode(exc),
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cause=exc)
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@six.add_metaclass(abc.ABCMeta)
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class MessagingPublisher(publisher.PublisherBase):
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def __init__(self, parsed_url):
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options = urlparse.parse_qs(parsed_url.query)
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# the value of options is a list of url param values
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# only take care of the latest one if the option
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# is provided more than once
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self.per_meter_topic = bool(int(
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options.get('per_meter_topic', [0])[-1]))
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self.policy = options.get('policy', ['default'])[-1]
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self.max_queue_length = int(options.get(
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'max_queue_length', [1024])[-1])
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self.max_retry = 0
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self.local_queue = []
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if self.policy in ['default', 'queue', 'drop']:
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LOG.info(_LI('Publishing policy set to %s') % self.policy)
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else:
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LOG.warning(_('Publishing policy is unknown (%s) force to '
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'default') % self.policy)
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self.policy = 'default'
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self.retry = 1 if self.policy in ['queue', 'drop'] else None
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def publish_samples(self, samples):
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"""Publish samples on RPC.
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:param samples: Samples from pipeline after transformation.
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"""
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meters = [
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utils.meter_message_from_counter(
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sample, cfg.CONF.publisher.telemetry_secret)
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for sample in samples
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]
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topic = cfg.CONF.publisher_notifier.metering_topic
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self.local_queue.append((topic, meters))
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if self.per_meter_topic:
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for meter_name, meter_list in itertools.groupby(
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sorted(meters, key=operator.itemgetter('counter_name')),
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operator.itemgetter('counter_name')):
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meter_list = list(meter_list)
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topic_name = topic + '.' + meter_name
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LOG.debug('Publishing %(m)d samples on %(n)s',
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{'m': len(meter_list), 'n': topic_name})
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self.local_queue.append((topic_name, meter_list))
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self.flush()
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def flush(self):
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# NOTE(sileht):
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# this is why the self.local_queue is emptied before processing the
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# queue and the remaining messages in the queue are added to
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# self.local_queue after in case of another call having already added
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# something in the self.local_queue
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queue = self.local_queue
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self.local_queue = []
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self.local_queue = (self._process_queue(queue, self.policy) +
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self.local_queue)
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if self.policy == 'queue':
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self._check_queue_length()
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def _check_queue_length(self):
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queue_length = len(self.local_queue)
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if queue_length > self.max_queue_length > 0:
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count = queue_length - self.max_queue_length
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self.local_queue = self.local_queue[count:]
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LOG.warning(_("Publisher max local_queue length is exceeded, "
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"dropping %d oldest samples") % count)
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def _process_queue(self, queue, policy):
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current_retry = 0
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while queue:
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topic, data = queue[0]
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try:
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self._send(topic, data)
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except DeliveryFailure:
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data = sum([len(m) for __, m in queue])
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if policy == 'queue':
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LOG.warning(_("Failed to publish %d datapoints, queue "
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"them"), data)
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return queue
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elif policy == 'drop':
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LOG.warning(_("Failed to publish %d datapoints, "
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"dropping them"), data)
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return []
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current_retry += 1
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if current_retry >= self.max_retry:
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LOG.exception(_LE("Failed to retry to send sample data "
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"with max_retry times"))
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raise
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else:
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queue.pop(0)
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return []
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def publish_events(self, events):
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"""Send an event message for publishing
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:param events: events from pipeline after transformation
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"""
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ev_list = [utils.message_from_event(
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event, cfg.CONF.publisher.telemetry_secret) for event in events]
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topic = cfg.CONF.publisher_notifier.event_topic
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self.local_queue.append((topic, ev_list))
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self.flush()
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@abc.abstractmethod
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def _send(self, topic, meters):
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"""Send the meters to the messaging topic."""
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class NotifierPublisher(MessagingPublisher):
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def __init__(self, parsed_url, default_topic):
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super(NotifierPublisher, self).__init__(parsed_url)
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options = urlparse.parse_qs(parsed_url.query)
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topic = options.get('topic', [default_topic])
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self.notifier = oslo_messaging.Notifier(
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messaging.get_transport(),
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driver=cfg.CONF.publisher_notifier.telemetry_driver,
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publisher_id='telemetry.publisher.%s' % cfg.CONF.host,
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topics=topic,
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retry=self.retry
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)
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def _send(self, event_type, data):
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try:
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self.notifier.sample({}, event_type=event_type,
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payload=data)
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except oslo_messaging.MessageDeliveryFailure as e:
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raise_delivery_failure(e)
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class SampleNotifierPublisher(NotifierPublisher):
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def __init__(self, parsed_url):
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super(SampleNotifierPublisher, self).__init__(
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parsed_url, cfg.CONF.publisher_notifier.metering_topic)
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class EventNotifierPublisher(NotifierPublisher):
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def __init__(self, parsed_url):
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super(EventNotifierPublisher, self).__init__(
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parsed_url, cfg.CONF.publisher_notifier.event_topic)
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