policy_module/osm_policy_module/core/agent.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 yaml
  27
  28 from kafka import KafkaConsumer
  29 from osm_policy_module.core.config import Config
  30 from osm_policy_module.common.lcm_client import LcmClient
  31
  32 from osm_policy_module.common.alarm_config import AlarmConfig
  33 from osm_policy_module.common.mon_client import MonClient
  34 from osm_policy_module.core.database import ScalingRecord, ScalingAlarm
  35
  36 log = logging.getLogger(__name__)
  37
  38
  39 class PolicyModuleAgent:
  40     def run(self):
  41         cfg = Config.instance()
  42         # Initialize servers
  43         kafka_server = '{}:{}'.format(cfg.get('policy_module', 'kafka_server_host'),
  44                                       cfg.get('policy_module', 'kafka_server_port'))
  45
  46         # Initialize Kafka consumer
  47         log.info("Connecting to Kafka server at %s", kafka_server)
  48         # TODO: Add logic to handle deduplication of messages when using group_id.
  49         # See: https://stackoverflow.com/a/29836412
  50         consumer = KafkaConsumer(bootstrap_servers=kafka_server,
  51                                  key_deserializer=bytes.decode,
  52                                  value_deserializer=bytes.decode)
  53         consumer.subscribe(['lcm_pm', 'alarm_response'])
  54
  55         for message in consumer:
  56             log.info("Message arrived: %s", message)
  57             try:
  58                 if message.key == 'configure_scaling':
  59                     try:
  60                         content = json.loads(message.value)
  61                     except:
  62                         content = yaml.safe_load(message.value)
  63                     log.info("Creating scaling record in DB")
  64                     # TODO: Use transactions: http://docs.peewee-orm.com/en/latest/peewee/transactions.html
  65                     scaling_record = ScalingRecord.create(
  66                         nsr_id=content['ns_id'],
  67                         name=content['scaling_group_descriptor']['name'],
  68                         content=json.dumps(content)
  69                     )
  70                     log.info("Created scaling record in DB : nsr_id=%s, name=%s, content=%s",
  71                              scaling_record.nsr_id,
  72                              scaling_record.name,
  73                              scaling_record.content)
  74                     alarm_configs = self._get_alarm_configs(content)
  75                     for config in alarm_configs:
  76                         mon_client = MonClient()
  77                         log.info("Creating alarm record in DB")
  78                         alarm_uuid = mon_client.create_alarm(
  79                             metric_name=config.metric_name,
  80                             resource_uuid=config.resource_uuid,
  81                             vim_uuid=config.vim_uuid,
  82                             threshold=config.threshold,
  83                             operation=config.operation,
  84                             statistic=config.statistic
  85                         )
  86                         ScalingAlarm.create(
  87                             alarm_id=alarm_uuid,
  88                             action=config.action,
  89                             scaling_record=scaling_record
  90                         )
  91                 if message.key == 'notify_alarm':
  92                     content = json.loads(message.value)
  93                     alarm_id = content['notify_details']['alarm_uuid']
  94                     alarm = ScalingAlarm.select().where(ScalingAlarm.alarm_id == alarm_id).get()
  95                     if alarm:
  96                         lcm_client = LcmClient()
  97                         log.info("Sending scaling action message for ns: %s", alarm_id)
  98                         lcm_client.scale(alarm.scaling_record.nsr_id, alarm.scaling_record.name, alarm.action)
  99             except Exception:
 100                 log.exception("Error consuming message: ")
 101
 102     def _get_alarm_configs(self, message_content):
 103         scaling_criterias = message_content['scaling_group_descriptor']['scaling_policy']['scaling_criteria']
 104         alarm_configs = []
 105         for criteria in scaling_criterias:
 106             metric_name = ''
 107             scale_out_threshold = criteria['scale_out_threshold']
 108             scale_in_threshold = criteria['scale_in_threshold']
 109             scale_out_operation = criteria['scale_out_relational_operation']
 110             scale_in_operation = criteria['scale_in_relational_operation']
 111             statistic = criteria['monitoring_param']['aggregation_type']
 112             vim_uuid = ''
 113             resource_uuid = ''
 114             if 'vdu_monitoring_param' in criteria['monitoring_param']:
 115                 vim_uuid = criteria['monitoring_param']['vdu_monitoring_param']['vim_uuid']
 116                 resource_uuid = criteria['monitoring_param']['vdu_monitoring_param']['resource_id']
 117                 metric_name = criteria['monitoring_param']['vdu_monitoring_param']['name']
 118             if 'vnf_metric' in criteria['monitoring_param']:
 119                 # TODO vnf_metric
 120                 continue
 121             if 'vdu_metric' in criteria['monitoring_param']:
 122                 # TODO vdu_metric
 123                 continue
 124             scale_out_alarm_config = AlarmConfig(metric_name,
 125                                                  resource_uuid,
 126                                                  vim_uuid,
 127                                                  scale_out_threshold,
 128                                                  scale_out_operation,
 129                                                  statistic,
 130                                                  'scale_out')
 131             scale_in_alarm_config = AlarmConfig(metric_name,
 132                                                 resource_uuid,
 133                                                 vim_uuid,
 134                                                 scale_in_threshold,
 135                                                 scale_in_operation,
 136                                                 statistic,
 137                                                 'scale_in')
 138             alarm_configs.append(scale_in_alarm_config)
 139             alarm_configs.append(scale_out_alarm_config)
 140         return alarm_configs