# # Copyright 2012 New Dream Network, LLC (DreamHost) # # Author: Doug Hellmann # # Licensed under the Apache License, Version 2.0 (the "License"); you may # not use this file except in compliance with the License. You may obtain # a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the # License for the specific language governing permissions and limitations # under the License. """Publish a sample using the preferred RPC mechanism. """ import abc import itertools import operator from oslo.config import cfg import oslo.messaging import six import six.moves.urllib.parse as urlparse from ceilometer import messaging from ceilometer.openstack.common.gettextutils import _ from ceilometer.openstack.common import log from ceilometer import publisher from ceilometer.publisher import utils LOG = log.getLogger(__name__) RPC_OPTS = [ cfg.StrOpt('metering_topic', default='metering', help='The topic that ceilometer uses for metering messages.', deprecated_group="DEFAULT", ), ] NOTIFIER_OPTS = [ cfg.StrOpt('metering_topic', default='metering', help='The topic that ceilometer uses for metering ' 'notifications.', ), cfg.StrOpt('metering_driver', default='messagingv2', help='The driver that ceilometer uses for metering ' 'notifications.', ) ] cfg.CONF.register_opts(RPC_OPTS, group="publisher_rpc") cfg.CONF.register_opts(NOTIFIER_OPTS, group="publisher_notifier") cfg.CONF.import_opt('host', 'ceilometer.service') @six.add_metaclass(abc.ABCMeta) class MessagingPublisher(publisher.PublisherBase): def __init__(self, parsed_url): options = urlparse.parse_qs(parsed_url.query) # the values of the option is a list of url params values # only take care of the latest one if the option # is provided more than once self.per_meter_topic = bool(int( options.get('per_meter_topic', [0])[-1])) self.policy = options.get('policy', ['default'])[-1] self.max_queue_length = int(options.get( 'max_queue_length', [1024])[-1]) self.local_queue = [] if self.policy in ['default', 'queue', 'drop']: LOG.info(_('Publishing policy set to %s') % self.policy) else: LOG.warn(_('Publishing policy is unknown (%s) force to default') % self.policy) self.policy = 'default' self.retry = 1 if self.policy in ['queue', 'drop'] else None def publish_samples(self, context, samples): """Publish samples on RPC. :param context: Execution context from the service or RPC call. :param samples: Samples from pipeline after transformation. """ meters = [ utils.meter_message_from_counter( sample, cfg.CONF.publisher.metering_secret) for sample in samples ] topic = cfg.CONF.publisher_rpc.metering_topic self.local_queue.append((context, topic, meters)) if self.per_meter_topic: for meter_name, meter_list in itertools.groupby( sorted(meters, key=operator.itemgetter('counter_name')), operator.itemgetter('counter_name')): meter_list = list(meter_list) topic_name = topic + '.' + meter_name LOG.debug('Publishing %(m)d samples on %(n)s', {'m': len(meter_list), 'n': topic_name}) self.local_queue.append((context, topic_name, meter_list)) self.flush() def flush(self): # NOTE(sileht): # IO of the rpc stuff in handled by eventlet, # this is why the self.local_queue, is emptied before processing the # queue and the remaining messages in the queue are added to # self.local_queue after in case of a other call have already added # something in the self.local_queue queue = self.local_queue self.local_queue = [] self.local_queue = (self._process_queue(queue, self.policy) + self.local_queue) if self.policy == 'queue': self._check_queue_length() def _check_queue_length(self): queue_length = len(self.local_queue) if queue_length > self.max_queue_length > 0: count = queue_length - self.max_queue_length self.local_queue = self.local_queue[count:] LOG.warn(_("Publisher max local_queue length is exceeded, " "dropping %d oldest samples") % count) def _process_queue(self, queue, policy): while queue: context, topic, meters = queue[0] try: self._send(context, topic, meters) except oslo.messaging.MessageDeliveryFailure: samples = sum([len(m) for __, __, m in queue]) if policy == 'queue': LOG.warn(_("Failed to publish %d samples, queue them"), samples) return queue elif policy == 'drop': LOG.warn(_("Failed to publish %d samples, dropping them"), samples) return [] # default, occur only if rabbit_max_retries > 0 raise else: queue.pop(0) return [] @abc.abstractmethod def _send(self, context, topic, meters): """Send the meters to the messaging topic.""" class RPCPublisher(MessagingPublisher): def __init__(self, parsed_url): super(RPCPublisher, self).__init__(parsed_url) options = urlparse.parse_qs(parsed_url.query) self.target = options.get('target', ['record_metering_data'])[0] self.rpc_client = messaging.get_rpc_client( messaging.get_transport(), retry=self.retry, version='1.0' ) def _send(self, context, topic, meters): self.rpc_client.prepare(topic=topic).cast(context, self.target, data=meters) class NotifierPublisher(MessagingPublisher): def __init__(self, parsed_url): super(NotifierPublisher, self).__init__(parsed_url) self.notifier = oslo.messaging.Notifier( messaging.get_transport(), driver=cfg.CONF.publisher_notifier.metering_driver, publisher_id='metering.publisher.%s' % cfg.CONF.host, topic=cfg.CONF.publisher_notifier.metering_topic, retry=self.retry ) def _send(self, context, event_type, meters): self.notifier.sample(context.to_dict(), event_type=event_type, payload=meters)