/usr/lib/python2.7/dist-packages/aodh/notifier/__init__.py is in python-aodh 2.0.0-0ubuntu1.
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# Copyright 2013-2015 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 abc
import logging
from oslo_config import cfg
import oslo_messaging
from oslo_service import service as os_service
from oslo_utils import netutils
import six
from stevedore import extension
from aodh.i18n import _
from aodh import messaging
OPTS = [
cfg.StrOpt('ipc_protocol',
default='queue',
choices=['queue', 'rpc'],
help='The protocol used to communicate between evaluator and '
'notifier services.'),
]
LOG = logging.getLogger(__name__)
@six.add_metaclass(abc.ABCMeta)
class AlarmNotifier(object):
"""Base class for alarm notifier plugins."""
@staticmethod
def __init__(conf):
pass
@abc.abstractmethod
def notify(self, action, alarm_id, alarm_name, severity, previous,
current, reason, reason_data):
"""Notify that an alarm has been triggered.
:param action: The action that is being attended, as a parsed URL.
:param alarm_id: The triggered alarm.
:param alarm_name: The name of triggered alarm.
:param severity: The level of triggered alarm
:param previous: The previous state of the alarm.
:param current: The current state of the alarm.
:param reason: The reason the alarm changed its state.
:param reason_data: A dict representation of the reason.
"""
class AlarmNotifierService(os_service.Service):
NOTIFIER_EXTENSIONS_NAMESPACE = "aodh.notifier"
def __init__(self, conf):
super(AlarmNotifierService, self).__init__()
transport = messaging.get_transport(conf)
self.notifiers = extension.ExtensionManager(
self.NOTIFIER_EXTENSIONS_NAMESPACE,
invoke_on_load=True,
invoke_args=(conf,))
if conf.ipc_protocol == 'rpc':
self.ipc = 'rpc'
self.rpc_server = messaging.get_rpc_server(
conf, transport, conf.notifier_rpc_topic, self)
else:
self.ipc = 'queue'
target = oslo_messaging.Target(topic=conf.notifier_topic)
self.listener = messaging.get_notification_listener(
transport, [target],
[AlarmEndpoint(self.notifiers)])
def start(self):
super(AlarmNotifierService, self).start()
if self.ipc == 'rpc':
self.rpc_server.start()
else:
self.listener.start()
# Add a dummy thread to have wait() working
self.tg.add_timer(604800, lambda: None)
def stop(self):
if self.ipc == 'rpc':
self.rpc_server.stop()
else:
self.listener.stop()
self.listener.wait()
super(AlarmNotifierService, self).stop()
def notify_alarm(self, context, data):
process_alarm(self.notifiers, data)
def _handle_action(notifiers, action, alarm_id, alarm_name, severity,
previous, current, reason, reason_data):
"""Process action on alarm
:param notifiers: list of possible notifiers.
:param action: The action that is being attended, as a parsed URL.
:param alarm_id: The triggered alarm.
:param alarm_name: The name of triggered alarm.
:param severity: The level of triggered alarm
:param previous: The previous state of the alarm.
:param current: The current state of the alarm.
:param reason: The reason the alarm changed its state.
:param reason_data: A dict representation of the reason.
"""
try:
action = netutils.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 = 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, alarm_name, severity,
previous, current, reason, reason_data)
except Exception:
LOG.exception(_("Unable to notify alarm %s"), alarm_id)
return
def process_alarm(notifiers, data):
"""Notify that alarm has been triggered.
:param notifiers: list of possible notifiers
:param data: (dict): alarm data
"""
actions = data.get('actions')
if not actions:
LOG.error(_("Unable to notify for an alarm with no action"))
return
for action in actions:
_handle_action(notifiers, action,
data.get('alarm_id'),
data.get('alarm_name'),
data.get('severity'),
data.get('previous'),
data.get('current'),
data.get('reason'),
data.get('reason_data'))
class AlarmEndpoint(object):
def __init__(self, notifiers):
self.notifiers = notifiers
def sample(self, ctxt, publisher_id, event_type, payload, metadata):
"""Endpoint for alarm notifications"""
process_alarm(self.notifiers, payload)
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