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#
# Copyright 2012 New Dream Network, LLC (DreamHost)
#
# 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
import oslo.messaging
from oslo_config import cfg
import six
import six.moves.urllib.parse as urlparse
import ceilometer
from ceilometer.i18n import _
from ceilometer import messaging
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 []
def publish_events(self, context, events):
"""Send an event message for publishing
:param context: Execution context from the service or RPC call
:param events: events from pipeline after transformation
"""
raise ceilometer.NotImplementedError
@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)
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