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     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         self.service.populate_prometheus()
  48
  49     def run(self):
  50         self.loop.run_until_complete(self.start())
  51
  52     async def start(self, wait_time=5):
  53         topics = ["alarm_request"]
  54         while True:
  55             try:
  56                 await self.msg_bus.aioread(topics, self._process_msg)
  57                 break
  58             except Exception as e:
  59                 # Failed to subscribe to kafka topic
  60                 log.error("Error when subscribing to topic(s) %s", str(topics))
  61                 log.exception("Exception %s", str(e))
  62                 # Wait for some time for kaka to stabilize and then reattempt to subscribe again
  63                 time.sleep(wait_time)
  64                 log.info("Retrying to subscribe the kafka topic(s) %s", str(topics))
  65
  66     async def _process_msg(self, topic, key, values):
  67         log.info("Message arrived: %s", values)
  68         try:
  69
  70             if topic == "alarm_request":
  71                 if key == "create_alarm_request":
  72                     alarm_details = values["alarm_create_request"]
  73                     cor_id = alarm_details["correlation_id"]
  74                     response_builder = ResponseBuilder()
  75                     try:
  76                         alarm = self.service.create_alarm(
  77                             alarm_details["alarm_name"],
  78                             alarm_details["threshold_value"],
  79                             alarm_details["operation"].lower(),
  80                             alarm_details["severity"].lower(),
  81                             alarm_details["statistic"].lower(),
  82                             alarm_details["metric_name"],
  83                             alarm_details["action"],
  84                             alarm_details["tags"],
  85                         )
  86                         response = response_builder.generate_response(
  87                             "create_alarm_response",
  88                             cor_id=cor_id,
  89                             status=True,
  90                             alarm_id=alarm.uuid,
  91                         )
  92                     except Exception:
  93                         log.exception("Error creating alarm: ")
  94                         response = response_builder.generate_response(
  95                             "create_alarm_response",
  96                             cor_id=cor_id,
  97                             status=False,
  98                             alarm_id=None,
  99                         )
 100                     await self._publish_response(
 101                         "alarm_response_" + str(cor_id),
 102                         "create_alarm_response",
 103                         response,
 104                     )
 105
 106                 if key == "delete_alarm_request":
 107                     alarm_details = values["alarm_delete_request"]
 108                     alarm_uuid = alarm_details["alarm_uuid"]
 109                     response_builder = ResponseBuilder()
 110                     cor_id = alarm_details["correlation_id"]
 111                     try:
 112                         self.service.delete_alarm(alarm_uuid)
 113                         response = response_builder.generate_response(
 114                             "delete_alarm_response",
 115                             cor_id=cor_id,
 116                             status=True,
 117                             alarm_id=alarm_uuid,
 118                         )
 119                     except Exception:
 120                         log.exception("Error deleting alarm: ")
 121                         response = response_builder.generate_response(
 122                             "delete_alarm_response",
 123                             cor_id=cor_id,
 124                             status=False,
 125                             alarm_id=alarm_uuid,
 126                         )
 127                     await self._publish_response(
 128                         "alarm_response_" + str(cor_id),
 129                         "delete_alarm_response",
 130                         response,
 131                     )
 132
 133         except Exception:
 134             log.exception("Exception processing message: ")
 135
 136     async def _publish_response(self, topic: str, key: str, msg: dict):
 137         log.info(
 138             "Sending response %s to topic %s with key %s", json.dumps(msg), topic, key
 139         )
 140         await self.msg_bus.aiowrite(topic, key, msg)