deb-aodh/aodh/evaluator/gnocchi.py
liu-sheng 279ca44a43 Avoid translating debug log
According to the OpenStack translation policy, available at
https://wiki.openstack.org/wiki/LoggingStandards, debug messages
should not be translated.

Change-Id: I143100500dcdf505827ac64750f94c78bf0299e9
2015-08-13 14:38:12 +08:00

102 lines
3.8 KiB
Python

#
# Copyright 2015 eNovance
#
# 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.
from oslo_config import cfg
from oslo_log import log
from oslo_serialization import jsonutils
import requests
from aodh.evaluator import threshold
from aodh.i18n import _
LOG = log.getLogger(__name__)
OPTS = [
cfg.StrOpt('gnocchi_url',
default="http://localhost:8041",
help='URL to Gnocchi.'),
]
class GnocchiThresholdEvaluator(threshold.ThresholdEvaluator):
def __init__(self, conf, notifier):
super(threshold.ThresholdEvaluator, self).__init__(conf, notifier)
self.gnocchi_url = conf.gnocchi_url
def _get_headers(self, content_type="application/json"):
return {
'Content-Type': content_type,
'X-Auth-Token': self.ks_client.auth_token,
}
def _statistics(self, alarm, start, end):
"""Retrieve statistics over the current window."""
method = 'get'
req = {
'url': self.gnocchi_url + "/v1",
'headers': self._get_headers(),
'params': {
'aggregation': alarm.rule['aggregation_method'],
'start': start,
'end': end,
}
}
if alarm.type == 'gnocchi_aggregation_by_resources_threshold':
method = 'post'
req['url'] += "/aggregation/resource/%s/metric/%s" % (
alarm.rule['resource_type'], alarm.rule['metric'])
req['data'] = alarm.rule['query']
# FIXME(sileht): In case of a heat autoscaling stack decide to
# delete an instance, the gnocchi metrics associated to this
# instance will be no more updated and when the alarm will ask
# for the aggregation, gnocchi will raise a 'No overlap' exception.
# So temporary set 'percent_of_overlap' to 0 to disable the
# gnocchi checks about missing points. For more detail see:
# https://bugs.launchpad.net/gnocchi/+bug/1479429
req['params']['percent_of_overlap'] = 0
elif alarm.type == 'gnocchi_aggregation_by_metrics_threshold':
req['url'] += "/aggregation/metric"
req['params']['metric[]'] = alarm.rule['metrics']
elif alarm.type == 'gnocchi_resources_threshold':
req['url'] += "/resource/%s/%s/metric/%s/measures" % (
alarm.rule['resource_type'],
alarm.rule['resource_id'], alarm.rule['metric'])
LOG.debug('stats query %s', req['url'])
try:
r = getattr(requests, method)(**req)
except Exception:
LOG.exception(_('alarm stats retrieval failed'))
return []
if int(r.status_code / 100) != 2:
LOG.exception(_('alarm stats retrieval failed: %s') % r.text)
return []
else:
return jsonutils.loads(r.text)
@staticmethod
def _sanitize(alarm, statistics):
"""Return the datapoints that correspond to the alarm granularity"""
# TODO(sileht): if there's no direct match, but there is an archive
# policy with granularity that's an even divisor or the period,
# we could potentially do a mean-of-means (or max-of-maxes or whatever,
# but not a stddev-of-stddevs).
return [stats[2] for stats in statistics
if stats[1] == alarm.rule['granularity']]