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# -*- coding: utf-8 -*-
#
# This file is part of Glances.
#
# SPDX-FileCopyrightText: 2022 Nicolas Hennion <nicolas@nicolargo.com>
#
# SPDX-License-Identifier: LGPL-3.0-only
#
"""Prometheus interface class."""
import sys
from numbers import Number
from glances.logger import logger
from glances.exports.glances_export import GlancesExport
from glances.compat import iteritems, listkeys
from prometheus_client import start_http_server, Gauge
class Export(GlancesExport):
"""This class manages the Prometheus export module."""
METRIC_SEPARATOR = '_'
def __init__(self, config=None, args=None):
"""Init the Prometheus export IF."""
super(Export, self).__init__(config=config, args=args)
# Load the Prometheus configuration file section
self.export_enable = self.load_conf('prometheus', mandatories=['host', 'port', 'labels'], options=['prefix'])
if not self.export_enable:
exit('Missing PROMETHEUS config')
# Optionals configuration keys
if self.prefix is None:
self.prefix = 'glances'
if self.labels is None:
self.labels = 'src:glances'
# Init the metric dict
# Perhaps a better method is possible...
self._metric_dict = {}
# Init the Prometheus Exporter
self.init()
def init(self):
"""Init the Prometheus Exporter"""
try:
start_http_server(port=int(self.port), addr=self.host)
except Exception as e:
logger.critical("Can not start Prometheus exporter on {}:{} ({})".format(self.host, self.port, e))
sys.exit(2)
else:
logger.info("Start Prometheus exporter on {}:{}".format(self.host, self.port))
def export(self, name, columns, points):
"""Write the points to the Prometheus exporter using Gauge."""
logger.debug("Export {} stats to Prometheus exporter".format(name))
# Remove non number stats and convert all to float (for Boolean)
data = {k: float(v) for (k, v) in iteritems(dict(zip(columns, points))) if isinstance(v, Number)}
# Write metrics to the Prometheus exporter
for k, v in iteritems(data):
# Prometheus metric name: prefix_<glances stats name>
metric_name = self.prefix + self.METRIC_SEPARATOR + str(name) + self.METRIC_SEPARATOR + str(k)
# Prometheus is very sensible to the metric name
# See: https://prometheus.io/docs/practices/naming/
for c in ['.', '-', '/', ' ']:
metric_name = metric_name.replace(c, self.METRIC_SEPARATOR)
# Get the labels
labels = self.parse_tags(self.labels)
# Manage an internal dict between metric name and Gauge
if metric_name not in self._metric_dict:
self._metric_dict[metric_name] = Gauge(metric_name, k, labelnames=listkeys(labels))
# Write the value
if hasattr(self._metric_dict[metric_name], 'labels'):
# Add the labels (see issue #1255)
self._metric_dict[metric_name].labels(**labels).set(v)
else:
self._metric_dict[metric_name].set(v)