Support for exporting data to a MQTT server

conf/glances.conf

@@ -399,6 +399,14 @@ user=guest
 password=guest
 queue=glances_queue
 
+[mqtt]
+# Configuration for the --export mqtt option
+host=localhost
+port=8883
+user=guest
+password=guest
+topic=glances
+
 [couchdb]
 # Configuration for the --export couchdb option
 # https://www.couchdb.org

docs/gw/index.rst

@@ -18,6 +18,7 @@ to providing stats to multiple services (see list below).
    influxdb
    json
    kafka
+   mqtt
    opentsdb
    prometheus
    rabbitmq

docs/gw/mqtt.rst

+.. _mqtt:
+
+MQTT
+========
+
+You can export statistics to an ``MQTT`` server. The
+connection should be defined in the Glances configuration file as
+following:
+
+.. code-block:: ini
+
+    [mqtt]
+    host=localhost
+    port=883
+    user=glances
+    password=glances
+    topic=glances
+
+and run Glances with:
+
+.. code-block:: console
+
+    $ glances --export mqtt

glances/README.txt

@@ -44,6 +44,7 @@ exports
     => Glances export interfaces
     glances_csv.py          The CSV export module
     glances_influxdb.py     The InfluxDB export module
+    glances_mqtt.py         The MQTT export module
     glances_opentsdb.py     The OpenTSDB export module
     glances_rabbitmq.py     The RabbitMQ export module
     glances_statsd.py       The StatsD export module

glances/exports/glances_mqtt.py

+# -*- coding: utf-8 -*-
+#
+# This file is part of Glances.
+#
+# Copyright (C) 2018 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
+
+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
+
+        # Load the MQTT configuration file
+        self.export_enable = self.load_conf('mqtt',
+                                            mandatories=['host', 'password'],
+                                            options=['port', 'user', 'topic'])
+        if not self.export_enable:
+            exit('Missing MQTT config')
+
+        # Get the current hostname
+        self.hostname = socket.gethostname()
+
+        self.port = self.port or 8883
+        self.topic = self.topic or 'glances'
+        self.user = self.user or 'glances'
+
+        # 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)
+            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)
+
+        for sensor, value in zip(columns, points):
+            try:
+                sensor = [whitelisted(name) for name in sensor.split('.')]
+                topic = '/'.join([self.topic, self.hostname, name, *sensor])
+                self.client.publish(topic, value)
+            except Exception as e:
+                logger.error("Can not export stats to MQTT server (%s)" % e)

optional-requirements.txt

@@ -8,6 +8,7 @@ influxdb
 kafka-python
 netifaces
 nvidia-ml-py3
+paho-mqtt
 pika
 potsdb
 prometheus_client

setup.py

@@ -89,7 +89,7 @@ setup(
         'cpuinfo': ['py-cpuinfo'],
         'docker': ['docker>=2.0.0'],
         'export': ['bernhard', 'cassandra-driver', 'couchdb', 'elasticsearch',
-                   'influxdb>=1.0.0', 'kafka-python', 'pika', 'potsdb',
+                   'influxdb>=1.0.0', 'kafka-python', 'pika', 'paho-mqtt', 'potsdb',
                    'prometheus_client', 'pyzmq', 'statsd'],
         'folders': ['scandir'],  # python_version<"3.5"
         'gpu': ['nvidia-ml-py3'],  # python_version=="2.7"