osm_mon/evaluator/evaluator.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 json
  24 import logging
  25 import multiprocessing
  26 import time
  27
  28 import requests
  29 from osm_common.dbbase import DbException
  30
  31 from osm_mon.collector.backends.prometheus import OSM_METRIC_PREFIX
  32 from osm_mon.core.common_db import CommonDbClient
  33 from osm_mon.core.database import DatabaseManager, Alarm
  34 from osm_mon.core.message_bus.producer import Producer
  35 from osm_mon.core.response import ResponseBuilder
  36 from osm_mon.core.settings import Config
  37
  38 log = logging.getLogger(__name__)
  39
  40
  41 class Evaluator:
  42     def __init__(self):
  43         self.common_db = CommonDbClient()
  44         self.plugins = []
  45         self.database_manager = DatabaseManager()
  46         self.database_manager.create_tables()
  47         self.queue = multiprocessing.Queue()
  48
  49     def _evaluate_metric(self,
  50                          nsr_id: str,
  51                          vnf_member_index: int,
  52                          vdur_name: str,
  53                          metric_name: str,
  54                          alarm: Alarm):
  55         log.debug("_evaluate_metric")
  56         # TODO: Refactor to fit backend plugin model
  57         cfg = Config.instance()
  58         query_section = "query={0}{{ns_id=\"{1}\",vdu_name=\"{2}\",vnf_member_index=\"{3}\"}}".format(
  59             OSM_METRIC_PREFIX + metric_name, nsr_id, vdur_name, vnf_member_index)
  60         request_url = cfg.OSMMON_PROMETHEUS_URL + "/api/v1/query?" + query_section
  61         log.info("Querying Prometheus: %s", request_url)
  62         r = requests.get(request_url)
  63         if r.status_code == 200:
  64             json_response = r.json()
  65             if json_response['status'] == 'success':
  66                 result = json_response['data']['result']
  67                 if len(result):
  68                     metric_value = float(result[0]['value'][1])
  69                     log.info("Metric value: %s", metric_value)
  70                     if alarm.operation.upper() == 'GT':
  71                         if metric_value > alarm.threshold:
  72                             self.queue.put(alarm)
  73                     elif alarm.operation.upper() == 'LT':
  74                         if metric_value < alarm.threshold:
  75                             self.queue.put(alarm)
  76                 else:
  77                     log.warning("No metric result for alarm %s", alarm.id)
  78             else:
  79                 log.warning("Prometheus response is not success. Got status %s", json_response['status'])
  80         else:
  81             log.warning("Error contacting Prometheus. Got status code %s: %s", r.status_code, r.text)
  82
  83     def evaluate_forever(self):
  84         log.debug('evaluate_forever')
  85         cfg = Config.instance()
  86         while True:
  87             try:
  88                 self.evaluate()
  89                 time.sleep(cfg.OSMMON_EVALUATOR_INTERVAL)
  90             except Exception:
  91                 log.exception("Error evaluating alarms")
  92
  93     def evaluate(self):
  94         log.debug('evaluate')
  95         processes = []
  96         for alarm in Alarm.select():
  97             try:
  98                 vnfr = self.common_db.get_vnfr(alarm.nsr_id, alarm.vnf_member_index)
  99             except DbException:
 100                 log.exception("Error getting vnfr: ")
 101                 continue
 102             vnfd = self.common_db.get_vnfd(vnfr['vnfd-id'])
 103             try:
 104                 vdur = next(filter(lambda vdur: vdur['name'] == alarm.vdur_name, vnfr['vdur']))
 105             except StopIteration:
 106                 log.warning("No vdur found with name %s for alarm %s", alarm.vdur_name, alarm.id)
 107                 continue
 108             vdu = next(filter(lambda vdu: vdu['id'] == vdur['vdu-id-ref'], vnfd['vdu']))
 109             vnf_monitoring_param = next(
 110                 filter(lambda param: param['id'] == alarm.monitoring_param, vnfd['monitoring-param']))
 111             nsr_id = vnfr['nsr-id-ref']
 112             vnf_member_index = vnfr['member-vnf-index-ref']
 113             vdur_name = vdur['name']
 114             if 'vdu-monitoring-param' in vnf_monitoring_param:
 115                 vdu_monitoring_param = next(filter(
 116                     lambda param: param['id'] == vnf_monitoring_param['vdu-monitoring-param'][
 117                         'vdu-monitoring-param-ref'], vdu['monitoring-param']))
 118                 nfvi_metric = vdu_monitoring_param['nfvi-metric']
 119
 120                 p = multiprocessing.Process(target=self._evaluate_metric,
 121                                             args=(nsr_id,
 122                                                   vnf_member_index,
 123                                                   vdur_name,
 124                                                   nfvi_metric,
 125                                                   alarm))
 126                 processes.append(p)
 127                 p.start()
 128             if 'vdu-metric' in vnf_monitoring_param:
 129                 vnf_metric_name = vnf_monitoring_param['vdu-metric']['vdu-metric-name-ref']
 130                 p = multiprocessing.Process(target=self._evaluate_metric,
 131                                             args=(nsr_id,
 132                                                   vnf_member_index,
 133                                                   vdur_name,
 134                                                   vnf_metric_name,
 135                                                   alarm))
 136                 processes.append(p)
 137                 p.start()
 138             if 'vnf-metric' in vnf_monitoring_param:
 139                 log.warning("vnf-metric is not currently supported.")
 140                 continue
 141
 142         for process in processes:
 143             process.join()
 144         triggered_alarms = []
 145         while not self.queue.empty():
 146             triggered_alarms.append(self.queue.get())
 147         for alarm in triggered_alarms:
 148             self.notify_alarm(alarm)
 149             p = multiprocessing.Process(target=self.notify_alarm,
 150                                         args=(alarm,))
 151             p.start()
 152
 153     def notify_alarm(self, alarm: Alarm):
 154         log.debug("notify_alarm")
 155         response = ResponseBuilder()
 156         now = time.strftime("%d-%m-%Y") + " " + time.strftime("%X")
 157         # Generate and send response
 158         resp_message = response.generate_response(
 159             'notify_alarm',
 160             alarm_id=alarm.id,
 161             vdu_name=alarm.vdur_name,
 162             vnf_member_index=alarm.vnf_member_index,
 163             ns_id=alarm.nsr_id,
 164             metric_name=alarm.monitoring_param,
 165             operation=alarm.operation,
 166             threshold_value=alarm.threshold,
 167             sev=alarm.severity,
 168             status='alarm',
 169             date=now)
 170         producer = Producer()
 171         producer.send(topic='alarm_response', key='notify_alarm', value=json.dumps(resp_message))
 172         producer.flush()
 173         log.info("Sent alarm notification: %s", resp_message)