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     def __init__(self, config: Config, loop=None):
  40         self.conf = config
  41         if not loop:
  42             loop = asyncio.get_event_loop()
  43         self.loop = loop
  44         self.msg_bus = MessageBusClient(config)
  45         self.service = ServerService(config)
  46
  47     def run(self):
  48         self.loop.run_until_complete(self.start())
  49
  50     async def start(self):
  51         topics = ["alarm_request"]
  52         try:
  53             await self.msg_bus.aioread(topics, self._process_msg)
  54         except Exception as e:
  55             # Failed to subscribe to kafka topic
  56             log.exception("Error when subscribing to topics %s", str(topics))
  57             raise e
  58
  59     async def _process_msg(self, topic, key, values):
  60         log.info("Message arrived: %s", values)
  61         try:
  62
  63             if topic == "alarm_request":
  64                 if key == "create_alarm_request":
  65                     alarm_details = values["alarm_create_request"]
  66                     cor_id = alarm_details["correlation_id"]
  67                     response_builder = ResponseBuilder()
  68                     try:
  69                         alarm = self.service.create_alarm(
  70                             alarm_details["alarm_name"],
  71                             alarm_details["threshold_value"],
  72                             alarm_details["operation"].lower(),
  73                             alarm_details["severity"].lower(),
  74                             alarm_details["statistic"].lower(),
  75                             alarm_details["metric_name"],
  76                             alarm_details["tags"],
  77                         )
  78                         response = response_builder.generate_response(
  79                             "create_alarm_response",
  80                             cor_id=cor_id,
  81                             status=True,
  82                             alarm_id=alarm.uuid,
  83                         )
  84                     except Exception:
  85                         log.exception("Error creating alarm: ")
  86                         response = response_builder.generate_response(
  87                             "create_alarm_response",
  88                             cor_id=cor_id,
  89                             status=False,
  90                             alarm_id=None,
  91                         )
  92                     await self._publish_response(
  93                         "alarm_response_" + str(cor_id),
  94                         "create_alarm_response",
  95                         response,
  96                     )
  97
  98                 if key == "delete_alarm_request":
  99                     alarm_details = values["alarm_delete_request"]
 100                     alarm_uuid = alarm_details["alarm_uuid"]
 101                     response_builder = ResponseBuilder()
 102                     cor_id = alarm_details["correlation_id"]
 103                     try:
 104                         self.service.delete_alarm(alarm_uuid)
 105                         response = response_builder.generate_response(
 106                             "delete_alarm_response",
 107                             cor_id=cor_id,
 108                             status=True,
 109                             alarm_id=alarm_uuid,
 110                         )
 111                     except Exception:
 112                         log.exception("Error deleting alarm: ")
 113                         response = response_builder.generate_response(
 114                             "delete_alarm_response",
 115                             cor_id=cor_id,
 116                             status=False,
 117                             alarm_id=alarm_uuid,
 118                         )
 119                     await self._publish_response(
 120                         "alarm_response_" + str(cor_id),
 121                         "delete_alarm_response",
 122                         response,
 123                     )
 124
 125         except Exception:
 126             log.exception("Exception processing message: ")
 127
 128     async def _publish_response(self, topic: str, key: str, msg: dict):
 129         log.info(
 130             "Sending response %s to topic %s with key %s", json.dumps(msg), topic, key
 131         )
 132         await self.msg_bus.aiowrite(topic, key, msg)