201 lines
7.0 KiB
Python
201 lines
7.0 KiB
Python
#
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# Copyright 2012 New Dream Network, LLC (DreamHost)
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#
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# Author: Doug Hellmann <doug.hellmann@dreamhost.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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"""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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import oslo.messaging
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import six
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import six.moves.urllib.parse as urlparse
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from ceilometer import messaging
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from ceilometer.openstack.common.gettextutils import _
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from ceilometer.openstack.common import log
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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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RPC_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 messages.',
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deprecated_group="DEFAULT",
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),
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]
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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('metering_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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)
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]
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cfg.CONF.register_opts(RPC_OPTS,
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group="publisher_rpc")
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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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@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 values of the option is a list of url params 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.local_queue = []
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if self.policy in ['default', 'queue', 'drop']:
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LOG.info(_('Publishing policy set to %s') % self.policy)
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else:
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LOG.warn(_('Publishing policy is unknown (%s) force to default')
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% 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, context, samples):
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"""Publish samples on RPC.
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:param context: Execution context from the service or RPC call.
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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,
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cfg.CONF.publisher.metering_secret)
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for sample in samples
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]
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topic = cfg.CONF.publisher_rpc.metering_topic
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self.local_queue.append((context, 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((context, 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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# IO of the rpc stuff in handled by eventlet,
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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 a other call have 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.warn(_("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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while queue:
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context, topic, meters = queue[0]
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try:
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self._send(context, topic, meters)
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except oslo.messaging.MessageDeliveryFailure:
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samples = sum([len(m) for __, __, m in queue])
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if policy == 'queue':
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LOG.warn(_("Failed to publish %d samples, queue them"),
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samples)
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return queue
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elif policy == 'drop':
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LOG.warn(_("Failed to publish %d samples, dropping them"),
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samples)
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return []
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# default, occur only if rabbit_max_retries > 0
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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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@abc.abstractmethod
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def _send(self, context, topic, meters):
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"""Send the meters to the messaging topic."""
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class RPCPublisher(MessagingPublisher):
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def __init__(self, parsed_url):
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super(RPCPublisher, self).__init__(parsed_url)
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options = urlparse.parse_qs(parsed_url.query)
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self.target = options.get('target', ['record_metering_data'])[0]
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self.rpc_client = messaging.get_rpc_client(
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messaging.get_transport(),
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retry=self.retry, version='1.0'
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)
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def _send(self, context, topic, meters):
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self.rpc_client.prepare(topic=topic).cast(context, self.target,
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data=meters)
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class NotifierPublisher(MessagingPublisher):
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def __init__(self, parsed_url):
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super(NotifierPublisher, self).__init__(parsed_url)
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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.metering_driver,
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publisher_id='metering.publisher.%s' % cfg.CONF.host,
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topic=cfg.CONF.publisher_notifier.metering_topic,
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retry=self.retry
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)
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def _send(self, context, event_type, meters):
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self.notifier.sample(context.to_dict(), event_type=event_type,
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payload=meters)
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