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 from osm_mon.core.config import Config
  29 from osm_mon.core.message_bus_client import MessageBusClient
  30 from osm_mon.core.models import Alarm
  31 from osm_mon.core.response import ResponseBuilder
  32 from osm_mon.evaluator.service import EvaluatorService, AlarmStatus
  33
  34 log = logging.getLogger(__name__)
  35
  36
  37 class Evaluator:
  38     def __init__(self, config: Config, loop=None):
  39         self.conf = config
  40         if not loop:
  41             loop = asyncio.get_event_loop()
  42         self.loop = loop
  43         self.service = EvaluatorService(config)
  44         self.msg_bus = MessageBusClient(config)
  45
  46     def evaluate_forever(self):
  47         log.debug("evaluate_forever")
  48         while True:
  49             try:
  50                 self.evaluate()
  51                 time.sleep(int(self.conf.get("evaluator", "interval")))
  52             except Exception:
  53                 log.exception("Error evaluating alarms")
  54
  55     def evaluate(self):
  56         log.debug("evaluate")
  57         log.info("Starting alarm evaluation")
  58         alarms_tuples = self.service.evaluate_alarms()
  59         processes = []
  60         for alarm, status in alarms_tuples:
  61             p = multiprocessing.Process(target=self.notify_alarm, args=(alarm, status))
  62             p.start()
  63             processes.append(p)
  64         for process in processes:
  65             process.join(timeout=10)
  66         log.info("Alarm evaluation is complete")
  67
  68     def notify_alarm(self, alarm: Alarm, status: AlarmStatus):
  69         log.debug("_notify_alarm")
  70         resp_message = self._build_alarm_response(alarm, status)
  71         log.info("Sent alarm notification: %s", resp_message)
  72         self.loop.run_until_complete(
  73             self.msg_bus.aiowrite("alarm_response", "notify_alarm", resp_message)
  74         )
  75         evaluator_service = EvaluatorService(self.conf)
  76         evaluator_service.update_alarm_status(status.value, alarm.uuid)
  77         return
  78
  79     def _build_alarm_response(self, alarm: Alarm, status: AlarmStatus):
  80         log.debug("_build_alarm_response")
  81         response = ResponseBuilder()
  82         tags = {}
  83         for name, value in alarm.tags.items():
  84             tags[name] = value
  85         now = time.strftime("%d-%m-%Y") + " " + time.strftime("%X")
  86         return response.generate_response(
  87             "notify_alarm",
  88             alarm_id=alarm.uuid,
  89             metric_name=alarm.metric,
  90             operation=alarm.operation,
  91             threshold_value=alarm.threshold,
  92             sev=alarm.severity,
  93             status=status.value,
  94             date=now,
  95             tags=tags,
  96         )