985f482709
The implementation of the combination evaluator. 'and' and 'or' operations are allowed. Implements blueprint alarming-logical-combination Change-Id: Ie6b7dedc8aa5debb250c83e1c6db05c0d66eea1b
104 lines
3.9 KiB
Python
104 lines
3.9 KiB
Python
# -*- encoding: utf-8 -*-
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#
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# Copyright © 2013 eNovance <licensing@enovance.com>
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#
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# Authors: Mehdi Abaakouk <mehdi.abaakouk@enovance.com>
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from ceilometer.alarm import evaluator
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from ceilometer.alarm.evaluator import OK, ALARM, UNKNOWN
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from ceilometer.openstack.common import log
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from ceilometer.openstack.common.gettextutils import _
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LOG = log.getLogger(__name__)
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COMPARATORS = {'and': all, 'or': any}
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class CombinationEvaluator(evaluator.Evaluator):
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def _get_alarm_state(self, alarm_id):
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try:
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alarm = self._client.alarm.get(alarm_id)
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except Exception:
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LOG.exception(_('alarm retrieval failed'))
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return None
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return alarm.state
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def _sufficient_states(self, alarm, states):
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"""Ensure there is sufficient data for evaluation,
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transitioning to unknown otherwise.
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"""
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missing_states = len(alarm.rule['alarm_ids']) - len(states)
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sufficient = missing_states == 0
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if not sufficient and alarm.state != UNKNOWN:
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reason = _('%(missing_states)d alarms in %(alarm_ids)s'
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' are in unknown state') % \
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{'missing_states': missing_states,
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'alarm_ids': ",".join(alarm.rule['alarm_ids'])}
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self._refresh(alarm, UNKNOWN, reason)
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return sufficient
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@staticmethod
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def _reason(alarm, state):
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"""Fabricate reason string."""
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transition = alarm.state != state
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if alarm.rule['operator'] == 'or':
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if transition:
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return (_('Transition to %(state)s due at least to one alarm'
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' in %(alarm_ids)s in state %(state)s') %
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{'state': state,
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'alarm_ids': ",".join(alarm.rule['alarm_ids'])})
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return (_('Remaining as %(state)s due at least to one alarm in'
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' %(alarm_ids)s in state %(state)s') %
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{'state': state,
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'alarm_ids': ",".join(alarm.rule['alarm_ids'])})
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elif alarm.rule['operator'] == 'and':
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if transition:
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return (_('Transition to %(state)s due to all alarms'
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' (%(alarm_ids)s) in state %(state)s') %
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{'state': state,
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'alarm_ids': ",".join(alarm.rule['alarm_ids'])})
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return (_('Remaining as %(state)s due to all alarms'
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' (%(alarm_ids)s) in state %(state)s') %
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{'state': state,
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'alarm_ids': ",".join(alarm.rule['alarm_ids'])})
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def _transition(self, alarm, underlying_states):
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"""Transition alarm state if necessary.
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"""
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op = alarm.rule['operator']
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if COMPARATORS[op](s == ALARM for s in underlying_states):
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state = ALARM
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else:
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state = OK
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continuous = alarm.repeat_actions
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reason = self._reason(alarm, state)
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if alarm.state != state or continuous:
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self._refresh(alarm, state, reason)
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def evaluate(self, alarm):
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states = []
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for _id in alarm.rule['alarm_ids']:
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state = self._get_alarm_state(_id)
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#note(sileht): alarm can be evaluated only with
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#stable state of other alarm
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if state and state != UNKNOWN:
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states.append(state)
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if self._sufficient_states(alarm, states):
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self._transition(alarm, states)
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