# -*- encoding: utf-8 -*- # # Copyright © 2013 Red Hat, Inc # Copyright © 2013 eNovance # # Authors: Eoghan Glynn # Julien Danjou # # 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 abc from ceilometerclient import client as ceiloclient from oslo.config import cfg import six from stevedore import extension from ceilometer.alarm.partition import coordination from ceilometer.alarm import rpc as rpc_alarm from ceilometer.openstack.common.gettextutils import _ # noqa from ceilometer.openstack.common import importutils from ceilometer.openstack.common import log from ceilometer.openstack.common import network_utils from ceilometer.openstack.common.rpc import dispatcher as rpc_dispatcher from ceilometer.openstack.common.rpc import service as rpc_service from ceilometer.openstack.common import service as os_service from ceilometer import service OPTS = [ cfg.IntOpt('evaluation_interval', default=60, help='Period of evaluation cycle, should' ' be >= than configured pipeline interval for' ' collection of underlying metrics.', deprecated_opts=[cfg.DeprecatedOpt( 'threshold_evaluation_interval', group='alarm')]), cfg.StrOpt('evaluation_service', default='ceilometer.alarm.service.SingletonAlarmService', help='Class to launch as alarm evaluation service'), ] cfg.CONF.register_opts(OPTS, group='alarm') cfg.CONF.import_opt('notifier_rpc_topic', 'ceilometer.alarm.rpc', group='alarm') cfg.CONF.import_opt('partition_rpc_topic', 'ceilometer.alarm.rpc', group='alarm') LOG = log.getLogger(__name__) @six.add_metaclass(abc.ABCMeta) class AlarmService(object): EXTENSIONS_NAMESPACE = "ceilometer.alarm.evaluator" def _load_evaluators(self): self.evaluators = extension.ExtensionManager( namespace=self.EXTENSIONS_NAMESPACE, invoke_on_load=True, invoke_args=(rpc_alarm.RPCAlarmNotifier(),) ) self.supported_evaluators = [ext.name for ext in self.evaluators.extensions] @property def _client(self): """Construct or reuse an authenticated API client.""" if not self.api_client: auth_config = cfg.CONF.service_credentials creds = dict( os_auth_url=auth_config.os_auth_url, os_region_name=auth_config.os_region_name, os_tenant_name=auth_config.os_tenant_name, os_password=auth_config.os_password, os_username=auth_config.os_username, cacert=auth_config.os_cacert, endpoint_type=auth_config.os_endpoint_type, ) self.api_client = ceiloclient.get_client(2, **creds) return self.api_client def _evaluate_assigned_alarms(self): try: alarms = self._assigned_alarms() LOG.info(_('initiating evaluation cycle on %d alarms') % len(alarms)) for alarm in alarms: self._evaluate_alarm(alarm) except Exception: LOG.exception(_('alarm evaluation cycle failed')) def _evaluate_alarm(self, alarm): """Evaluate the alarms assigned to this evaluator.""" if alarm.type not in self.supported_evaluators: LOG.debug(_('skipping alarm %s: type unsupported') % alarm.alarm_id) return LOG.debug(_('evaluating alarm %s') % alarm.alarm_id) self.evaluators[alarm.type].obj.evaluate(alarm) @abc.abstractmethod def _assigned_alarms(self): pass class SingletonAlarmService(AlarmService, os_service.Service): def __init__(self): super(SingletonAlarmService, self).__init__() self._load_evaluators() self.api_client = None def start(self): super(SingletonAlarmService, self).start() if self.evaluators: interval = cfg.CONF.alarm.evaluation_interval self.tg.add_timer( interval, self._evaluate_assigned_alarms, 0) # Add a dummy thread to have wait() working self.tg.add_timer(604800, lambda: None) def _assigned_alarms(self): return self._client.alarms.list(q=[{'field': 'enabled', 'value': True}]) def alarm_evaluator(): service.prepare_service() eval_service = importutils.import_object(cfg.CONF.alarm.evaluation_service) os_service.launch(eval_service).wait() cfg.CONF.import_opt('host', 'ceilometer.service') class PartitionedAlarmService(AlarmService, rpc_service.Service): def __init__(self): super(PartitionedAlarmService, self).__init__( cfg.CONF.host, cfg.CONF.alarm.partition_rpc_topic, self ) self._load_evaluators() self.api_client = None self.partition_coordinator = coordination.PartitionCoordinator() def initialize_service_hook(self, service): LOG.debug(_('initialize_service_hooks')) self.conn.create_worker( cfg.CONF.alarm.partition_rpc_topic, rpc_dispatcher.RpcDispatcher([self]), 'ceilometer.alarm.' + cfg.CONF.alarm.partition_rpc_topic, ) def start(self): super(PartitionedAlarmService, self).start() if self.evaluators: eval_interval = cfg.CONF.alarm.evaluation_interval self.tg.add_timer( eval_interval / 4, self.partition_coordinator.report_presence, 0) self.tg.add_timer( eval_interval / 2, self.partition_coordinator.check_mastership, eval_interval, *[eval_interval, self._client]) self.tg.add_timer( eval_interval, self._evaluate_assigned_alarms, eval_interval) # Add a dummy thread to have wait() working self.tg.add_timer(604800, lambda: None) def _assigned_alarms(self): return self.partition_coordinator.assigned_alarms(self._client) def presence(self, context, data): self.partition_coordinator.presence(data.get('uuid'), data.get('priority')) def assign(self, context, data): self.partition_coordinator.assign(data.get('uuid'), data.get('alarms')) def allocate(self, context, data): self.partition_coordinator.allocate(data.get('uuid'), data.get('alarms')) class AlarmNotifierService(rpc_service.Service): EXTENSIONS_NAMESPACE = "ceilometer.alarm.notifier" def __init__(self, host, topic): super(AlarmNotifierService, self).__init__(host, topic, self) self.notifiers = extension.ExtensionManager(self.EXTENSIONS_NAMESPACE, invoke_on_load=True) def start(self): super(AlarmNotifierService, self).start() # Add a dummy thread to have wait() working self.tg.add_timer(604800, lambda: None) def initialize_service_hook(self, service): LOG.debug(_('initialize_service_hooks')) self.conn.create_worker( cfg.CONF.alarm.notifier_rpc_topic, rpc_dispatcher.RpcDispatcher([self]), 'ceilometer.alarm.' + cfg.CONF.alarm.notifier_rpc_topic, ) def _handle_action(self, action, alarm_id, previous, current, reason): try: action = network_utils.urlsplit(action) except Exception: LOG.error( _("Unable to parse action %(action)s for alarm %(alarm_id)s"), {'action': action, 'alarm_id': alarm_id}) return try: notifier = self.notifiers[action.scheme].obj except KeyError: scheme = action.scheme LOG.error( _("Action %(scheme)s for alarm %(alarm_id)s is unknown, " "cannot notify"), {'scheme': scheme, 'alarm_id': alarm_id}) return try: LOG.debug(_("Notifying alarm %(id)s with action %(act)s") % ( {'id': alarm_id, 'act': action})) notifier.notify(action, alarm_id, previous, current, reason) except Exception: LOG.exception(_("Unable to notify alarm %s"), alarm_id) return def notify_alarm(self, context, data): """Notify that alarm has been triggered. data should be a dict with the following keys: - actions, the URL of the action to run; this is a mapped to extensions automatically - alarm_id, the ID of the alarm that has been triggered - previous, the previous state of the alarm - current, the new state the alarm has transitioned to - reason, the reason the alarm changed its state :param context: Request context. :param data: A dict as described above. """ actions = data.get('actions') if not actions: LOG.error(_("Unable to notify for an alarm with no action")) return for action in actions: self._handle_action(action, data.get('alarm_id'), data.get('previous'), data.get('current'), data.get('reason')) def alarm_notifier(): service.prepare_service() os_service.launch(AlarmNotifierService( cfg.CONF.host, 'ceilometer.alarm')).wait()