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# -*- coding: utf-8 -*-
#
# This file is part of Glances.
#
# Copyright (C) 2019 Nicolargo <nicolas@nicolargo.com>
#
# Glances is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Glances is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""MQTT interface class."""
import socket
import string
import json
from glances.logger import logger
from glances.exports.glances_export import GlancesExport
# Import paho for MQTT
from requests import certs
import paho.mqtt.client as paho
class Export(GlancesExport):
"""This class manages the MQTT export module."""
def __init__(self, config=None, args=None):
"""Init the MQTT export IF."""
super(Export, self).__init__(config=config, args=args)
# Mandatories configuration keys (additional to host and port)
self.user = None
self.password = None
self.topic = None
self.tls = 'true'
# Load the MQTT configuration file
self.export_enable = self.load_conf('mqtt',
mandatories=['host', 'password'],
options=['port', 'user', 'topic', 'tls', 'topic_structure'])
if not self.export_enable:
exit('Missing MQTT config')
# Get the current hostname
self.hostname = socket.gethostname()
self.port = int(self.port) or 8883
self.topic = self.topic or 'glances'
self.user = self.user or 'glances'
self.tls = (self.tls and self.tls.lower() == 'true')
self.topic_structure = (self.topic_structure or 'per-metric').lower()
if self.topic_structure not in ['per-metric', 'per-plugin']:
logger.critical("topic_structure must be either 'per-metric' or 'per-plugin'.")
return None
# Init the MQTT client
self.client = self.init()
def init(self):
"""Init the connection to the MQTT server."""
if not self.export_enable:
return None
try:
client = paho.Client(client_id='glances_' + self.hostname,
clean_session=False)
client.username_pw_set(username=self.user,
password=self.password)
if self.tls:
client.tls_set(certs.where())
client.connect(host=self.host,
port=self.port)
client.loop_start()
return client
except Exception as e:
logger.critical("Connection to MQTT server failed : %s " % e)
return None
def export(self, name, columns, points):
"""Write the points in MQTT."""
WHITELIST = '_-' + string.ascii_letters + string.digits
SUBSTITUTE = '_'
def whitelisted(s,
whitelist=WHITELIST,
substitute=SUBSTITUTE):
return ''.join(c if c in whitelist else substitute for c in s)
if self.topic_structure == 'per-metric':
for sensor, value in zip(columns, points):
try:
sensor = [whitelisted(name) for name in sensor.split('.')]
tobeexport = [self.topic, self.hostname, name]
tobeexport.extend(sensor)
topic = '/'.join(tobeexport)
self.client.publish(topic, value)
except Exception as e:
logger.error("Can not export stats to MQTT server (%s)" % e)
elif self.topic_structure == 'per-plugin':
try:
topic = '/'.join([self.topic, self.hostname, name])
sensor_values = dict(zip(columns, points))
# Build the value to output
output_value = dict()
for key in sensor_values:
split_key = key.split('.')
# Add the parent keys if they don't exist
current_level = output_value
for depth in range(len(split_key) - 1):
if split_key[depth] not in current_level:
current_level[split_key[depth]] = dict()
current_level = current_level[split_key[depth]]
# Add the value
current_level[split_key[len(split_key) - 1]] = sensor_values[key]
json_value = json.dumps(output_value)
self.client.publish(topic, json_value)
except Exception as e:
logger.error("Can not export stats to MQTT server (%s)" % e)
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