osm_policy_module/common/mon_client.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
  21 # For those usages not covered by the Apache License, Version 2.0 please
  22 # contact: bdiaz@whitestack.com or glavado@whitestack.com
  23 ##
  24 import json
  25 import logging
  26 import random
  27 import uuid
  28
  29 from kafka import KafkaProducer, KafkaConsumer
  30
  31 from osm_policy_module.core.config import Config
  32
  33 log = logging.getLogger(__name__)
  34
  35
  36 class MonClient:
  37     def __init__(self):
  38         cfg = Config.instance()
  39         self.kafka_server = '{}:{}'.format(cfg.OSMPOL_MESSAGE_HOST,
  40                                            cfg.OSMPOL_MESSAGE_PORT)
  41         self.producer = KafkaProducer(bootstrap_servers=self.kafka_server,
  42                                       key_serializer=str.encode,
  43                                       value_serializer=str.encode)
  44
  45     def create_alarm(self, metric_name: str, ns_id: str, vdu_name: str, vnf_member_index: int, threshold: int,
  46                      statistic: str, operation: str):
  47         cor_id = random.randint(1, 1000000)
  48         msg = self._create_alarm_payload(cor_id, metric_name, ns_id, vdu_name, vnf_member_index, threshold, statistic,
  49                                          operation)
  50         log.info("Sending create_alarm_request %s", msg)
  51         self.producer.send(topic='alarm_request', key='create_alarm_request', value=json.dumps(msg))
  52         self.producer.flush()
  53         consumer = KafkaConsumer(bootstrap_servers=self.kafka_server,
  54                                  key_deserializer=bytes.decode,
  55                                  value_deserializer=bytes.decode,
  56                                  consumer_timeout_ms=10000,
  57                                  group_id='mon-client-' + str(uuid.uuid4()))
  58         consumer.subscribe(['alarm_response'])
  59         for message in consumer:
  60             if message.key == 'create_alarm_response':
  61                 content = json.loads(message.value)
  62                 log.info("Received create_alarm_response %s", content)
  63                 if self._is_alarm_response_correlation_id_eq(cor_id, content):
  64                     alarm_uuid = content['alarm_create_response']['alarm_uuid']
  65                     # TODO Handle error response
  66                     return alarm_uuid
  67
  68         raise ValueError('Timeout: No alarm creation response from MON. Is MON up?')
  69
  70     def _create_alarm_payload(self, cor_id: int, metric_name: str, ns_id: str, vdu_name: str, vnf_member_index: int,
  71                               threshold: int, statistic: str, operation: str):
  72         alarm_create_request = {
  73             'correlation_id': cor_id,
  74             'alarm_name': str(uuid.uuid4()),
  75             'metric_name': metric_name,
  76             'ns_id': ns_id,
  77             'vdu_name': vdu_name,
  78             'vnf_member_index': vnf_member_index,
  79             'operation': operation,
  80             'severity': 'critical',
  81             'threshold_value': threshold,
  82             'statistic': statistic
  83         }
  84         msg = {
  85             'alarm_create_request': alarm_create_request,
  86         }
  87         return msg
  88
  89     def _is_alarm_response_correlation_id_eq(self, cor_id, message_content):
  90         return message_content['alarm_create_response']['correlation_id'] == cor_id