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 import time
  30
  31 from osm_mon.core.config import Config
  32 from osm_mon.core.message_bus_client import MessageBusClient
  33 from osm_mon.core.response import ResponseBuilder
  34 from osm_mon.server.service import ServerService
  35
  36 log = logging.getLogger(__name__)
  37
  38
  39 class Server:
  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.msg_bus = MessageBusClient(config)
  47         self.service = ServerService(config)
  48
  49     def run(self):
  50         self.loop.run_until_complete(self.start())
  51
  52     async def start(self, wait_time=5):
  53         topics = [
  54             "alarm_request"
  55         ]
  56         while True:
  57             try:
  58                 await self.msg_bus.aioread(topics, self._process_msg)
  59                 break
  60             except Exception as e:
  61                 # Failed to subscribe to kafka topic
  62                 log.exception("Error when subscribing to topics %s", str(topics))
  63                 log.exception("Exception %s", str(e))
  64                 # Wait for some time for kaka to stabilize and then reattempt to subscribe again
  65                 time.sleep(wait_time)
  66                 log.info("Retrying to subscribe the kafka topic(s) %s", str(topics))
  67
  68     async def _process_msg(self, topic, key, values):
  69         log.info("Message arrived: %s", values)
  70         try:
  71
  72             if topic == "alarm_request":
  73                 if key == "create_alarm_request":
  74                     alarm_details = values['alarm_create_request']
  75                     cor_id = alarm_details['correlation_id']
  76                     response_builder = ResponseBuilder()
  77                     try:
  78                         alarm = self.service.create_alarm(
  79                             alarm_details['alarm_name'],
  80                             alarm_details['threshold_value'],
  81                             alarm_details['operation'].lower(),
  82                             alarm_details['severity'].lower(),
  83                             alarm_details['statistic'].lower(),
  84                             alarm_details['metric_name'],
  85                             alarm_details['tags']
  86                         )
  87                         response = response_builder.generate_response('create_alarm_response',
  88                                                                       cor_id=cor_id,
  89                                                                       status=True,
  90                                                                       alarm_id=alarm.uuid)
  91                     except Exception:
  92                         log.exception("Error creating alarm: ")
  93                         response = response_builder.generate_response('create_alarm_response',
  94                                                                       cor_id=cor_id,
  95                                                                       status=False,
  96                                                                       alarm_id=None)
  97                     await self._publish_response('alarm_response_' + str(cor_id), 'create_alarm_response', response)
  98
  99                 if key == "delete_alarm_request":
 100                     alarm_details = values['alarm_delete_request']
 101                     alarm_uuid = alarm_details['alarm_uuid']
 102                     response_builder = ResponseBuilder()
 103                     cor_id = alarm_details['correlation_id']
 104                     try:
 105                         self.service.delete_alarm(alarm_uuid)
 106                         response = response_builder.generate_response('delete_alarm_response',
 107                                                                       cor_id=cor_id,
 108                                                                       status=True,
 109                                                                       alarm_id=alarm_uuid)
 110                     except Exception:
 111                         log.exception("Error deleting alarm: ")
 112                         response = response_builder.generate_response('delete_alarm_response',
 113                                                                       cor_id=cor_id,
 114                                                                       status=False,
 115                                                                       alarm_id=alarm_uuid)
 116                     await self._publish_response('alarm_response_' + str(cor_id), 'delete_alarm_response', response)
 117
 118         except Exception:
 119             log.exception("Exception processing message: ")
 120
 121     async def _publish_response(self, topic: str, key: str, msg: dict):
 122         log.info("Sending response %s to topic %s with key %s", json.dumps(msg), topic, key)
 123         await self.msg_bus.aiowrite(topic, key, msg)