osm_mon/collector/prometheus_exporter.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 import logging
  24 import threading
  25 import time
  26 from http.server import HTTPServer
  27
  28 from prometheus_client import MetricsHandler
  29 from prometheus_client.core import REGISTRY
  30
  31 from osm_mon.collector.collector import MonCollector
  32 from osm_mon.core.settings import Config
  33
  34 log = logging.getLogger(__name__)
  35
  36
  37 class MonPrometheusExporter:
  38
  39     def __init__(self):
  40         self.mon_collector = MonCollector()
  41         self.custom_collector = CustomCollector()
  42
  43     def _run_exporter(self):
  44         log.debug('_run_exporter')
  45         REGISTRY.register(self.custom_collector)
  46         server_address = ('', 8000)
  47         httpd = HTTPServer(server_address, MetricsHandler)
  48         log.info("Starting MON Prometheus exporter at port %s", 8000)
  49         httpd.serve_forever()
  50
  51     def run(self):
  52         log.debug('_run')
  53         self._run_exporter()
  54         self._run_collector()
  55
  56     def _run_collector(self):
  57         log.debug('_run_collector')
  58         t = threading.Thread(target=self._collect_metrics_forever)
  59         t.setDaemon(True)
  60         t.start()
  61
  62     def _collect_metrics_forever(self):
  63         log.debug('_collect_metrics_forever')
  64         cfg = Config.instance()
  65         while True:
  66             time.sleep(cfg.OSMMON_COLLECTOR_INTERVAL)
  67             metrics = self.mon_collector.collect_metrics()
  68             self.custom_collector.metrics = metrics
  69
  70
  71 class CustomCollector(object):
  72
  73     def __init__(self):
  74         self.mon_collector = MonCollector()
  75         self.metrics = []
  76
  77     def describe(self):
  78         log.debug('describe')
  79         return []
  80
  81     def collect(self):
  82         log.debug("collect")
  83         metrics = self.mon_collector.collect_metrics()
  84         return metrics
  85
  86
  87 if __name__ == '__main__':
  88     MonPrometheusExporter().run()