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         self.service.populate_prometheus()
  47
  48     def run(self):
  49         self.loop.run_until_complete(self.start())
  50
  51     async def start(self):
  52         topics = ["alarm_request"]
  53         try:
  54             await self.msg_bus.aioread(topics, self._process_msg)
  55         except Exception as e:
  56             # Failed to subscribe to kafka topic
  57             log.exception("Error when subscribing to topics %s", str(topics))
  58             raise e
  59
  60     async def _process_msg(self, topic, key, values):
  61         log.info("Message arrived: %s", values)
  62         try:
  63
  64             if topic == "alarm_request":
  65                 if key == "create_alarm_request":
  66                     alarm_details = values["alarm_create_request"]
  67                     cor_id = alarm_details["correlation_id"]
  68                     response_builder = ResponseBuilder()
  69                     try:
  70                         alarm = self.service.create_alarm(
  71                             alarm_details["alarm_name"],
  72                             alarm_details["threshold_value"],
  73                             alarm_details["operation"].lower(),
  74                             alarm_details["severity"].lower(),
  75                             alarm_details["statistic"].lower(),
  76                             alarm_details["metric_name"],
  77                             alarm_details["tags"],
  78                         )
  79                         response = response_builder.generate_response(
  80                             "create_alarm_response",
  81                             cor_id=cor_id,
  82                             status=True,
  83                             alarm_id=alarm.uuid,
  84                         )
  85                     except Exception:
  86                         log.exception("Error creating alarm: ")
  87                         response = response_builder.generate_response(
  88                             "create_alarm_response",
  89                             cor_id=cor_id,
  90                             status=False,
  91                             alarm_id=None,
  92                         )
  93                     await self._publish_response(
  94                         "alarm_response_" + str(cor_id),
  95                         "create_alarm_response",
  96                         response,
  97                     )
  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(
 107                             "delete_alarm_response",
 108                             cor_id=cor_id,
 109                             status=True,
 110                             alarm_id=alarm_uuid,
 111                         )
 112                     except Exception:
 113                         log.exception("Error deleting alarm: ")
 114                         response = response_builder.generate_response(
 115                             "delete_alarm_response",
 116                             cor_id=cor_id,
 117                             status=False,
 118                             alarm_id=alarm_uuid,
 119                         )
 120                     await self._publish_response(
 121                         "alarm_response_" + str(cor_id),
 122                         "delete_alarm_response",
 123                         response,
 124                     )
 125
 126         except Exception:
 127             log.exception("Exception processing message: ")
 128
 129     async def _publish_response(self, topic: str, key: str, msg: dict):
 130         log.info(
 131             "Sending response %s to topic %s with key %s", json.dumps(msg), topic, key
 132         )
 133         await self.msg_bus.aiowrite(topic, key, msg)