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 asyncio
  24 import logging
  25 import multiprocessing
  26 import time
  27
  28 import peewee
  29 import requests
  30 from osm_common.dbbase import DbException
  31
  32 from osm_mon.collector.backends.prometheus import OSM_METRIC_PREFIX
  33 from osm_mon.core.common_db import CommonDbClient
  34 from osm_mon.core.config import Config
  35 from osm_mon.core.database import DatabaseManager, Alarm
  36 from osm_mon.core.message_bus_client import MessageBusClient
  37 from osm_mon.core.response import ResponseBuilder
  38
  39 log = logging.getLogger(__name__)
  40
  41
  42 class Evaluator:
  43     def __init__(self, config: Config, loop=None):
  44         self.conf = config
  45         if not loop:
  46             loop = asyncio.get_event_loop()
  47         self.loop = loop
  48         self.common_db = CommonDbClient(self.conf)
  49         self.plugins = []
  50         self.database_manager = DatabaseManager(self.conf)
  51         self.database_manager.create_tables()
  52         self.queue = multiprocessing.Queue()
  53         self.msg_bus = MessageBusClient(config)
  54
  55     def _evaluate_metric(self,
  56                          nsr_id: str,
  57                          vnf_member_index: int,
  58                          vdur_name: str,
  59                          metric_name: str,
  60                          alarm: Alarm):
  61         log.debug("_evaluate_metric")
  62         # TODO: Refactor to fit backend plugin model
  63         query_section = "query={0}{{ns_id=\"{1}\",vdu_name=\"{2}\",vnf_member_index=\"{3}\"}}".format(
  64             OSM_METRIC_PREFIX + metric_name, nsr_id, vdur_name, vnf_member_index)
  65         request_url = self.conf.get('prometheus', 'url') + "/api/v1/query?" + query_section
  66         log.info("Querying Prometheus: %s", request_url)
  67         r = requests.get(request_url, timeout=int(self.conf.get('global', 'request_timeout')))
  68         if r.status_code == 200:
  69             json_response = r.json()
  70             if json_response['status'] == 'success':
  71                 result = json_response['data']['result']
  72                 if len(result):
  73                     metric_value = float(result[0]['value'][1])
  74                     log.info("Metric value: %s", metric_value)
  75                     if alarm.operation.upper() == 'GT':
  76                         if metric_value > alarm.threshold:
  77                             self.queue.put(alarm)
  78                     elif alarm.operation.upper() == 'LT':
  79                         if metric_value < alarm.threshold:
  80                             self.queue.put(alarm)
  81                 else:
  82                     log.warning("No metric result for alarm %s", alarm.id)
  83             else:
  84                 log.warning("Prometheus response is not success. Got status %s", json_response['status'])
  85         else:
  86             log.warning("Error contacting Prometheus. Got status code %s: %s", r.status_code, r.text)
  87
  88     def evaluate_forever(self):
  89         log.debug('evaluate_forever')
  90         while True:
  91             try:
  92                 self.evaluate()
  93                 time.sleep(int(self.conf.get('evaluator', 'interval')))
  94             except peewee.PeeweeException:
  95                 log.exception("Database error evaluating alarms: ")
  96                 raise
  97             except Exception:
  98                 log.exception("Error evaluating alarms")
  99
 100     def evaluate(self):
 101         log.debug('evaluate')
 102         processes = []
 103         for alarm in Alarm.select():
 104             try:
 105                 vnfr = self.common_db.get_vnfr(alarm.nsr_id, alarm.vnf_member_index)
 106             except DbException:
 107                 log.exception("Error getting vnfr: ")
 108                 continue
 109             vnfd = self.common_db.get_vnfd(vnfr['vnfd-id'])
 110             try:
 111                 vdur = next(filter(lambda vdur: vdur['name'] == alarm.vdur_name, vnfr['vdur']))
 112             except StopIteration:
 113                 log.warning("No vdur found with name %s for alarm %s", alarm.vdur_name, alarm.id)
 114                 continue
 115             vdu = next(filter(lambda vdu: vdu['id'] == vdur['vdu-id-ref'], vnfd['vdu']))
 116             vnf_monitoring_param = next(
 117                 filter(lambda param: param['id'] == alarm.monitoring_param, vnfd['monitoring-param']))
 118             nsr_id = vnfr['nsr-id-ref']
 119             vnf_member_index = vnfr['member-vnf-index-ref']
 120             vdur_name = vdur['name']
 121             if 'vdu-monitoring-param' in vnf_monitoring_param:
 122                 vdu_monitoring_param = next(filter(
 123                     lambda param: param['id'] == vnf_monitoring_param['vdu-monitoring-param'][
 124                         'vdu-monitoring-param-ref'], vdu['monitoring-param']))
 125                 nfvi_metric = vdu_monitoring_param['nfvi-metric']
 126
 127                 p = multiprocessing.Process(target=self._evaluate_metric,
 128                                             args=(nsr_id,
 129                                                   vnf_member_index,
 130                                                   vdur_name,
 131                                                   nfvi_metric,
 132                                                   alarm))
 133                 processes.append(p)
 134                 p.start()
 135             if 'vdu-metric' in vnf_monitoring_param:
 136                 vnf_metric_name = vnf_monitoring_param['vdu-metric']['vdu-metric-name-ref']
 137                 p = multiprocessing.Process(target=self._evaluate_metric,
 138                                             args=(nsr_id,
 139                                                   vnf_member_index,
 140                                                   vdur_name,
 141                                                   vnf_metric_name,
 142                                                   alarm))
 143                 processes.append(p)
 144                 p.start()
 145             if 'vnf-metric' in vnf_monitoring_param:
 146                 vnf_metric_name = vnf_monitoring_param['vnf-metric']['vnf-metric-name-ref']
 147                 p = multiprocessing.Process(target=self._evaluate_metric,
 148                                             args=(nsr_id,
 149                                                   vnf_member_index,
 150                                                   '',
 151                                                   vnf_metric_name,
 152                                                   alarm))
 153                 processes.append(p)
 154                 p.start()
 155
 156         for process in processes:
 157             process.join(timeout=10)
 158         triggered_alarms = []
 159         while not self.queue.empty():
 160             triggered_alarms.append(self.queue.get())
 161         for alarm in triggered_alarms:
 162             p = multiprocessing.Process(target=self.notify_alarm,
 163                                         args=(alarm,))
 164             p.start()
 165
 166     def notify_alarm(self, alarm: Alarm):
 167         log.debug("notify_alarm")
 168         response = ResponseBuilder()
 169         now = time.strftime("%d-%m-%Y") + " " + time.strftime("%X")
 170         # Generate and send response
 171         resp_message = response.generate_response(
 172             'notify_alarm',
 173             alarm_id=alarm.uuid,
 174             vdu_name=alarm.vdur_name,
 175             vnf_member_index=alarm.vnf_member_index,
 176             ns_id=alarm.nsr_id,
 177             metric_name=alarm.monitoring_param,
 178             operation=alarm.operation,
 179             threshold_value=alarm.threshold,
 180             sev=alarm.severity,
 181             status='alarm',
 182             date=now)
 183         self.loop.run_until_complete(self.msg_bus.aiowrite('alarm_response', 'notify_alarm', resp_message))
 184         log.info("Sent alarm notification: %s", resp_message)