/usr/lib/python2.7/dist-packages/ceilometer/notification.py is in python-ceilometer 1:10.0.0-0ubuntu1.
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# Copyright 2017 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 itertools
import threading
import time
import uuid
from concurrent import futures
import cotyledon
from futurist import periodics
from oslo_config import cfg
from oslo_log import log
import oslo_messaging
from stevedore import named
from tooz import coordination
from ceilometer.i18n import _
from ceilometer import messaging
from ceilometer import utils
LOG = log.getLogger(__name__)
OPTS = [
cfg.IntOpt('pipeline_processing_queues',
default=10,
min=1,
help='Number of queues to parallelize workload across. This '
'value should be larger than the number of active '
'notification agents for optimal results. WARNING: '
'Once set, lowering this value may result in lost data.'),
cfg.BoolOpt('ack_on_event_error',
default=True,
help='Acknowledge message when event persistence fails.'),
cfg.BoolOpt('workload_partitioning',
default=False,
help='Enable workload partitioning, allowing multiple '
'notification agents to be run simultaneously.'),
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=100, min=1,
help='Number of notification messages to wait before '
'publishing them. Batching is advised when transformations are '
'applied in pipeline.'),
cfg.IntOpt('batch_timeout',
default=5,
help='Number of seconds to wait before publishing 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.periodic = None
self.shutdown = False
self.listeners = []
# NOTE(kbespalov): for the pipeline queues used a single amqp host
# hence only one listener is required
self.pipeline_listener = None
if self.conf.notification.workload_partitioning:
# XXX uuid4().bytes ought to work, but it requires ascii for now
coordination_id = (coordination_id or
str(uuid.uuid4()).encode('ascii'))
self.partition_coordinator = coordination.get_coordinator(
self.conf.coordination.backend_url, coordination_id)
self.partition_set = list(range(
self.conf.notification.pipeline_processing_queues))
self.group_state = None
else:
self.partition_coordinator = None
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)]
def _log_missing_pipeline(self, 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.coord_lock = threading.Lock()
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,
self.conf.notification.workload_partitioning))]
self.transport = messaging.get_transport(self.conf)
if self.conf.notification.workload_partitioning:
self.partition_coordinator.start(start_heart=True)
else:
# 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(self.transport, '')
self._configure_main_queue_listeners()
if self.conf.notification.workload_partitioning:
# join group after all manager set up is configured
self.hashring = self.partition_coordinator.join_partitioned_group(
self.NOTIFICATION_NAMESPACE)
@periodics.periodic(spacing=self.conf.coordination.check_watchers,
run_immediately=True)
def run_watchers():
self.partition_coordinator.run_watchers()
if self.group_state != self.hashring.ring.nodes:
self.group_state = self.hashring.ring.nodes.copy()
self._refresh_agent()
self.periodic = periodics.PeriodicWorker.create(
[], executor_factory=lambda:
futures.ThreadPoolExecutor(max_workers=10))
self.periodic.add(run_watchers)
utils.spawn_thread(self.periodic.start)
def _configure_main_queue_listeners(self):
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)
listener.start(
override_pool_size=self.conf.max_parallel_requests
)
self.listeners.append(listener)
def _refresh_agent(self):
with self.coord_lock:
if self.shutdown:
# NOTE(sileht): We are going to shutdown we everything will be
# stopped, we should not restart them
return
self._configure_pipeline_listener()
def _configure_pipeline_listener(self):
partitioned = list(filter(
self.hashring.belongs_to_self, self.partition_set))
endpoints = []
for pipe_mgr in self.managers:
endpoints.extend(pipe_mgr.get_interim_endpoints())
targets = []
for mgr, hash_id in itertools.product(self.managers, partitioned):
topic = '-'.join([mgr.NOTIFICATION_IPC, mgr.pm_type, str(hash_id)])
LOG.debug('Listening to queue: %s', topic)
targets.append(oslo_messaging.Target(topic=topic))
if self.pipeline_listener:
self.kill_listeners([self.pipeline_listener])
self.pipeline_listener = messaging.get_batch_notification_listener(
self.transport, targets, endpoints,
batch_size=self.conf.notification.batch_size,
batch_timeout=self.conf.notification.batch_timeout)
# NOTE(gordc): set single thread to process data sequentially
# if batching enabled.
batch = (1 if self.conf.notification.batch_size > 1
else self.conf.max_parallel_requests)
self.pipeline_listener.start(override_pool_size=batch)
@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.shutdown = True
if self.periodic:
self.periodic.stop()
self.periodic.wait()
if self.partition_coordinator:
self.partition_coordinator.stop()
with self.coord_lock:
if self.pipeline_listener:
self.kill_listeners([self.pipeline_listener])
self.kill_listeners(self.listeners)
super(NotificationService, self).terminate()
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