osm_mon/server/server.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 """
  24 MON component in charge of CRUD operations for vim_accounts and alarms. It uses the message bus to communicate.
  25 """
  26 import asyncio
  27 import json
  28 import logging
  29
  30 from osm_mon.core.config import Config
  31 from osm_mon.core.message_bus_client import MessageBusClient
  32 from osm_mon.core.response import ResponseBuilder
  33 from osm_mon.server.service import ServerService
  34
  35 log = logging.getLogger(__name__)
  36
  37
  38 class Server:
  39
  40     def __init__(self, config: Config, loop=None):
  41         self.conf = config
  42         if not loop:
  43             loop = asyncio.get_event_loop()
  44         self.loop = loop
  45         self.msg_bus = MessageBusClient(config)
  46         self.service = ServerService(config)
  47
  48     def run(self):
  49         self.loop.run_until_complete(self.start())
  50
  51     async def start(self):
  52         topics = [
  53             "alarm_request"
  54         ]
  55         try:
  56             await self.msg_bus.aioread(topics, self._process_msg)
  57         except Exception as e:
  58             # Failed to subscribe to kafka topic
  59             log.exception("Error when subscribing to topics %s", str(topics))
  60             raise e
  61
  62     async def _process_msg(self, topic, key, values):
  63         log.info("Message arrived: %s", values)
  64         try:
  65
  66             if topic == "alarm_request":
  67                 if key == "create_alarm_request":
  68                     alarm_details = values['alarm_create_request']
  69                     cor_id = alarm_details['correlation_id']
  70                     response_builder = ResponseBuilder()
  71                     try:
  72                         alarm = self.service.create_alarm(
  73                             alarm_details['alarm_name'],
  74                             alarm_details['threshold_value'],
  75                             alarm_details['operation'].lower(),
  76                             alarm_details['severity'].lower(),
  77                             alarm_details['statistic'].lower(),
  78                             alarm_details['metric_name'],
  79                             alarm_details['tags']
  80                         )
  81                         response = response_builder.generate_response('create_alarm_response',
  82                                                                       cor_id=cor_id,
  83                                                                       status=True,
  84                                                                       alarm_id=alarm.uuid)
  85                     except Exception:
  86                         log.exception("Error creating alarm: ")
  87                         response = response_builder.generate_response('create_alarm_response',
  88                                                                       cor_id=cor_id,
  89                                                                       status=False,
  90                                                                       alarm_id=None)
  91                     await self._publish_response('alarm_response_' + str(cor_id), 'create_alarm_response', response)
  92
  93                 if key == "delete_alarm_request":
  94                     alarm_details = values['alarm_delete_request']
  95                     alarm_uuid = alarm_details['alarm_uuid']
  96                     response_builder = ResponseBuilder()
  97                     cor_id = alarm_details['correlation_id']
  98                     try:
  99                         self.service.delete_alarm(alarm_uuid)
 100                         response = response_builder.generate_response('delete_alarm_response',
 101                                                                       cor_id=cor_id,
 102                                                                       status=True,
 103                                                                       alarm_id=alarm_uuid)
 104                     except Exception:
 105                         log.exception("Error deleting alarm: ")
 106                         response = response_builder.generate_response('delete_alarm_response',
 107                                                                       cor_id=cor_id,
 108                                                                       status=False,
 109                                                                       alarm_id=alarm_uuid)
 110                     await self._publish_response('alarm_response_' + str(cor_id), 'delete_alarm_response', response)
 111
 112         except Exception:
 113             log.exception("Exception processing message: ")
 114
 115     async def _publish_response(self, topic: str, key: str, msg: dict):
 116         log.info("Sending response %s to topic %s with key %s", json.dumps(msg), topic, key)
 117         await self.msg_bus.aiowrite(topic, key, msg)