osm_mon/evaluator/backends/prometheus.py

   1 # -*- coding: utf-8 -*-
   2
   3 # Copyright 2018 Whitestack, LLC
   4 # *************************************************************
   5
   6 # This file is part of OSM Monitoring module
   7 # All Rights Reserved to Whitestack, LLC
   8
   9 # Licensed under the Apache License, Version 2.0 (the "License"); you may
  10 # not use this file except in compliance with the License. You may obtain
  11 # a copy of the License at
  12
  13 #         http://www.apache.org/licenses/LICENSE-2.0
  14
  15 # Unless required by applicable law or agreed to in writing, software
  16 # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  17 # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  18 # License for the specific language governing permissions and limitations
  19 # under the License.
  20 # For those usages not covered by the Apache License, Version 2.0 please
  21 # contact: bdiaz@whitestack.com or glavado@whitestack.com
  22 ##
  23 import logging
  24
  25 import requests
  26
  27 from osm_mon.core.config import Config
  28 from osm_mon.evaluator.backends.base import BaseBackend
  29
  30 log = logging.getLogger(__name__)
  31
  32 OSM_METRIC_PREFIX = 'osm_'
  33
  34
  35 class PrometheusBackend(BaseBackend):
  36
  37     def __init__(self, config: Config):
  38         super().__init__(config)
  39         self.conf = config
  40
  41     def get_metric_value(self, metric_name, nsr_id, vdur_name, vnf_member_index):
  42         query_section = "query={0}{{ns_id=\"{1}\",vdu_name=\"{2}\",vnf_member_index=\"{3}\"}}".format(
  43             OSM_METRIC_PREFIX + metric_name, nsr_id, vdur_name, vnf_member_index)
  44         request_url = self.conf.get('prometheus', 'url') + "/api/v1/query?" + query_section
  45         log.info("Querying Prometheus: %s", request_url)
  46         r = requests.get(request_url, timeout=int(self.conf.get('global', 'request_timeout')))
  47         if r.status_code == 200:
  48             json_response = r.json()
  49             if json_response['status'] == 'success':
  50                 result = json_response['data']['result']
  51                 if len(result):
  52                     metric_value = float(result[0]['value'][1])
  53                     log.info("Metric value: %s", metric_value)
  54                     return metric_value
  55                 else:
  56                     return None
  57             else:
  58                 log.warning("Prometheus response is not success. Got status %s", json_response['status'])
  59         else:
  60             log.warning("Error contacting Prometheus. Got status code %s: %s", r.status_code, r.text)
  61         return None