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
  30 from osm_mon.core.config import Config
  31 from osm_mon.core.database import Alarm
  32 from osm_mon.core.message_bus_client import MessageBusClient
  33 from osm_mon.core.response import ResponseBuilder
  34 from osm_mon.evaluator.service import EvaluatorService, AlarmStatus
  35
  36 log = logging.getLogger(__name__)
  37
  38
  39 class Evaluator:
  40
  41     def __init__(self, config: Config, loop=None):
  42         self.conf = config
  43         if not loop:
  44             loop = asyncio.get_event_loop()
  45         self.loop = loop
  46         self.service = EvaluatorService(config)
  47         self.msg_bus = MessageBusClient(config)
  48
  49     def evaluate_forever(self):
  50         log.debug('evaluate_forever')
  51         while True:
  52             try:
  53                 self.evaluate()
  54                 time.sleep(int(self.conf.get('evaluator', 'interval')))
  55             except peewee.PeeweeException:
  56                 log.exception("Database error evaluating alarms: ")
  57                 raise
  58             except Exception:
  59                 log.exception("Error evaluating alarms")
  60
  61     def evaluate(self):
  62         log.debug('evaluate')
  63         alarms_tuples = self.service.evaluate_alarms()
  64         processes = []
  65         for alarm, status in alarms_tuples:
  66             p = multiprocessing.Process(target=self.notify_alarm,
  67                                         args=(alarm, status))
  68             p.start()
  69             processes.append(p)
  70         for process in processes:
  71             process.join(timeout=10)
  72
  73     def notify_alarm(self, alarm: Alarm, status: AlarmStatus):
  74         log.debug("notify_alarm")
  75         resp_message = self._build_alarm_response(alarm, status)
  76         log.info("Sent alarm notification: %s", resp_message)
  77         self.loop.run_until_complete(self.msg_bus.aiowrite('alarm_response', 'notify_alarm', resp_message))
  78
  79     def _build_alarm_response(self, alarm: Alarm, status: AlarmStatus):
  80         response = ResponseBuilder()
  81         tags = {}
  82         for tag in alarm.tags:
  83             tags[tag.name] = tag.value
  84         now = time.strftime("%d-%m-%Y") + " " + time.strftime("%X")
  85         return response.generate_response(
  86             'notify_alarm',
  87             alarm_id=alarm.uuid,
  88             metric_name=alarm.metric,
  89             operation=alarm.operation,
  90             threshold_value=alarm.threshold,
  91             sev=alarm.severity,
  92             status=status.value,
  93             date=now,
  94             tags=tags)