# # 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 itertools import operator from oslo.config import cfg import oslo.messaging import oslo.messaging._drivers.common 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__) METER_PUBLISH_OPTS = [ cfg.StrOpt('metering_topic', default='metering', help='The topic that ceilometer uses for metering messages.', deprecated_group="DEFAULT", ), ] def register_opts(config): """Register the options for publishing metering messages. """ config.register_opts(METER_PUBLISH_OPTS, group="publisher_rpc") register_opts(cfg.CONF) def oslo_messaging_is_rabbit(): kombu = ['ceilometer.openstack.common.rpc.impl_kombu', 'oslo.messaging._drivers.impl_rabbit:RabbitDriver' 'rabbit'] return cfg.CONF.rpc_backend in kombu or ( cfg.CONF.transport_url and cfg.CONF.transport_url.startswith('rabbit://')) def override_backend_retry_config(value): """Override the retry config option native to the configured rpc backend (if such a native config option exists). :param value: the value to override """ # TODO(sileht): ultimately we should add to olso a more generic concept # of retry config (i.e. not specific to an individual AMQP provider) # see: https://bugs.launchpad.net/ceilometer/+bug/1244698 # and: https://bugs.launchpad.net/oslo.messaging/+bug/1282639 if oslo_messaging_is_rabbit(): if 'rabbit_max_retries' in cfg.CONF: cfg.CONF.set_override('rabbit_max_retries', value) class RPCPublisher(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.target = options.get('target', ['record_metering_data'])[0] 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 ['queue', 'drop']: LOG.info(_('Publishing policy set to %s, ' 'override backend retry config to 1') % self.policy) override_backend_retry_config(1) elif self.policy == 'default': 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' transport = messaging.get_transport() self.rpc_client = messaging.get_rpc_client(transport, version='1.0') 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): # NOTE(sileht): # the behavior of rpc.cast call depends of rabbit_max_retries # if rabbit_max_retries <= 0: # it returns only if the msg has been sent on the amqp queue # if rabbit_max_retries > 0: # it raises a exception if rabbitmq is unreachable # # the default policy just respect the rabbitmq configuration # nothing special is done if rabbit_max_retries <= 0 # and exception is reraised if rabbit_max_retries > 0 while queue: context, topic, meters = queue[0] try: self.rpc_client.prepare(topic=topic).cast( context, self.target, data=meters) except oslo.messaging._drivers.common.RPCException: 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 []