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