osm_mon/collector/backends/prometheus.py

# -*- coding: utf-8 -*-

# Copyright 2018 Whitestack, LLC
# *************************************************************

# This file is part of OSM Monitoring module
# All Rights Reserved to Whitestack, LLC

# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at

#         http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
# For those usages not covered by the Apache License, Version 2.0 please
# contact: bdiaz@whitestack.com or glavado@whitestack.com
##
import logging
from typing import List

from prometheus_client import start_http_server
from prometheus_client.core import REGISTRY, GaugeMetricFamily

from osm_mon.collector.backends.base import BaseBackend
from osm_mon.collector.metric import Metric

log = logging.getLogger(__name__)

OSM_METRIC_PREFIX = 'osm_'


class PrometheusBackend(BaseBackend):

    def __init__(self):
        self.custom_collector = CustomCollector()
        self._start_exporter(8000)

    def handle(self, metrics: List[Metric]):
        prometheus_metrics = []
        for metric in metrics:
            prometheus_metric = GaugeMetricFamily(
                OSM_METRIC_PREFIX + metric.name,
                'OSM metric',
                labels=['ns_id', 'vnf_member_index', 'vdu_name']
            )
            prometheus_metric.add_metric([metric.nsr_id, metric.vnf_member_index, metric.vdur_name], metric.value)
            prometheus_metrics.append(prometheus_metric)
        self.custom_collector.metrics = prometheus_metrics

    def _start_exporter(self, port):
        log.debug('_start_exporter')
        REGISTRY.register(self.custom_collector)
        log.info("Starting MON Prometheus exporter at port %s", port)
        start_http_server(port)


class CustomCollector(object):

    def __init__(self):
        self.metrics = []

    def describe(self):
        log.debug('describe')
        return []

    def collect(self):
        log.debug("collect")
        return self.metrics