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#
# Copyright 2017-2018 Red Hat, Inc.
# Copyright 2012-2013 eNovance <licensing@enovance.com>
#
# 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.
import time
import cotyledon
from oslo_config import cfg
from oslo_log import log
import oslo_messaging
from stevedore import named
from ceilometer.i18n import _
from ceilometer import messaging
LOG = log.getLogger(__name__)
OPTS = [
cfg.BoolOpt('ack_on_event_error',
default=True,
help='Acknowledge message when event persistence fails.'),
cfg.MultiStrOpt('messaging_urls',
default=[],
secret=True,
help="Messaging URLs to listen for notifications. "
"Example: rabbit://user:pass@host1:port1"
"[,user:pass@hostN:portN]/virtual_host "
"(DEFAULT/transport_url is used if empty). This "
"is useful when you have dedicate messaging nodes "
"for each service, for example, all nova "
"notifications go to rabbit-nova:5672, while all "
"cinder notifications go to rabbit-cinder:5672."),
cfg.IntOpt('batch_size',
default=1, min=1,
help='Number of notification messages to wait before '
'publishing them.'),
cfg.IntOpt('batch_timeout',
help='Number of seconds to wait before dispatching samples '
'when batch_size is not reached (None means indefinitely).'
),
cfg.IntOpt('workers',
default=1,
min=1,
deprecated_group='DEFAULT',
deprecated_name='notification_workers',
help='Number of workers for notification service, '
'default value is 1.'),
cfg.MultiStrOpt('pipelines',
default=['meter', 'event'],
help="Select which pipeline managers to enable to "
" generate data"),
]
EXCHANGES_OPTS = [
cfg.MultiStrOpt('notification_control_exchanges',
default=['nova', 'glance', 'neutron', 'cinder', 'heat',
'keystone', 'sahara', 'trove', 'zaqar', 'swift',
'ceilometer', 'magnum', 'dns', 'ironic', 'aodh'],
deprecated_group='DEFAULT',
deprecated_name="http_control_exchanges",
help="Exchanges name to listen for notifications."),
]
class NotificationService(cotyledon.Service):
"""Notification service.
When running multiple agents, additional queuing sequence is required for
inter process communication. Each agent has two listeners: one to listen
to the main OpenStack queue and another listener(and notifier) for IPC to
divide pipeline sink endpoints. Coordination should be enabled to have
proper active/active HA.
"""
NOTIFICATION_NAMESPACE = 'ceilometer.notification.v2'
def __init__(self, worker_id, conf, coordination_id=None):
super(NotificationService, self).__init__(worker_id)
self.startup_delay = worker_id
self.conf = conf
self.listeners = []
def get_targets(self):
"""Return a sequence of oslo_messaging.Target
This sequence is defining the exchange and topics to be connected.
"""
topics = (self.conf.notification_topics
if 'notification_topics' in self.conf
else self.conf.oslo_messaging_notifications.topics)
return [oslo_messaging.Target(topic=topic, exchange=exchange)
for topic in set(topics)
for exchange in
set(self.conf.notification.notification_control_exchanges)]
@staticmethod
def _log_missing_pipeline(names):
LOG.error(_('Could not load the following pipelines: %s'), names)
def run(self):
# Delay startup so workers are jittered
time.sleep(self.startup_delay)
super(NotificationService, self).run()
self.managers = [ext.obj for ext in named.NamedExtensionManager(
namespace='ceilometer.notification.pipeline',
names=self.conf.notification.pipelines, invoke_on_load=True,
on_missing_entrypoints_callback=self._log_missing_pipeline,
invoke_args=(self.conf,))]
# FIXME(sileht): endpoint uses the notification_topics option
# and it should not because this is an oslo_messaging option
# not a ceilometer. Until we have something to get the
# notification_topics in another way, we must create a transport
# to ensure the option has been registered by oslo_messaging.
messaging.get_notifier(messaging.get_transport(self.conf), '')
endpoints = []
for pipe_mgr in self.managers:
endpoints.extend(pipe_mgr.get_main_endpoints())
targets = self.get_targets()
urls = self.conf.notification.messaging_urls or [None]
for url in urls:
transport = messaging.get_transport(self.conf, url)
# NOTE(gordc): ignore batching as we want pull
# to maintain sequencing as much as possible.
listener = messaging.get_batch_notification_listener(
transport, targets, endpoints, allow_requeue=True,
batch_size=self.conf.notification.batch_size,
batch_timeout=self.conf.notification.batch_timeout)
listener.start(
override_pool_size=self.conf.max_parallel_requests
)
self.listeners.append(listener)
@staticmethod
def kill_listeners(listeners):
# NOTE(gordc): correct usage of oslo.messaging listener is to stop(),
# which stops new messages, and wait(), which processes remaining
# messages and closes connection
for listener in listeners:
listener.stop()
listener.wait()
def terminate(self):
self.kill_listeners(self.listeners)
super(NotificationService, self).terminate()
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