osm_policy_module/cmd/policy_module_healthcheck.py

   1 # Copyright 2018 Whitestack, LLC
   2 # *************************************************************
   3
   4 # This file is part of OSM Monitoring module
   5 # All Rights Reserved to Whitestack, LLC
   6
   7 # Licensed under the Apache License, Version 2.0 (the "License"); you may
   8 # not use this file except in compliance with the License. You may obtain
   9 # a copy of the License at
  10
  11 #         http://www.apache.org/licenses/LICENSE-2.0
  12
  13 # Unless required by applicable law or agreed to in writing, software
  14 # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  15 # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  16 # License for the specific language governing permissions and limitations
  17 # under the License.
  18
  19 # For those usages not covered by the Apache License, Version 2.0 please
  20 # contact: bdiaz@whitestack.com or glavado@whitestack.com
  21 ##
  22 import argparse
  23 import asyncio
  24 import logging
  25 import subprocess
  26 import sys
  27
  28 from aiokafka import AIOKafkaConsumer
  29
  30 from osm_policy_module.core.config import Config
  31
  32 log = logging.getLogger(__name__)
  33
  34
  35 def main():
  36     parser = argparse.ArgumentParser(prog='osm-policy-healthcheck')
  37     parser.add_argument('--config-file', nargs='?', help='POL configuration file')
  38     args = parser.parse_args()
  39     cfg = Config(args.config_file)
  40
  41     if not _processes_running():
  42         sys.exit(1)
  43     if not _is_kafka_ok(cfg.get('message', 'host'), cfg.get('message', 'port')):
  44         sys.exit(1)
  45     sys.exit(0)
  46
  47
  48 def _processes_running():
  49     def _contains_process(processes, process_name):
  50         for row in processes:
  51             if process_name in row:
  52                 return True
  53         return False
  54
  55     processes_to_check = ['osm-policy-agent']
  56     ps = subprocess.Popen(['ps', 'aux'], stdout=subprocess.PIPE).communicate()[0]
  57     processes_running = ps.decode().split('\n')
  58     for p in processes_to_check:
  59         if not _contains_process(processes_running, p):
  60             return False
  61     return True
  62
  63
  64 def _is_kafka_ok(host, port):
  65     async def _test_kafka(loop):
  66         consumer = AIOKafkaConsumer(
  67             'healthcheck',
  68             loop=loop, bootstrap_servers='{}:{}'.format(host, port))
  69         await consumer.start()
  70         await consumer.stop()
  71
  72     try:
  73         loop = asyncio.get_event_loop()
  74         loop.run_until_complete(_test_kafka(loop))
  75         return True
  76     except Exception:
  77         log.exception("POL can not connect to Kafka")
  78         return False
  79
  80
  81 if __name__ == '__main__':
  82     main()