openstack/aodh
Code Issues Proposed changes
9a14370266
aodh/ceilometer/alarm/service.py
ChenZheng 7f542e3ac8 Add i18n warpping for all LOG messages 
Add i18n wrapping for all LOG messages

Change-Id: I7f9c71a3aa76364b291f7e21a1737b927cbdc300
Fixes: bug #1199678
2013-11-29 21:09:53 +08:00

286 lines
10 KiB
Python
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# -*- encoding: utf-8 -*-
#
# Copyright © 2013 Red Hat, Inc
# Copyright © 2013 eNovance <licensing@enovance.com>
#
# Authors: Eoghan Glynn <eglynn@redhat.com>
# Julien Danjou <julien@danjou.info>
#
# 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()
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