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check_mqtt
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#!/usr/bin/env python
'''
check_myrightweight.py makes use of some code from Jan-Piet Mens check-mqtt.py.
https://github.com/jpmens/check-mqtt
Copyright (c) 2016 Jeff Albrecht
All rights reserved.
Use this to monitor an mqtt application with Nagios.
Unlike check-mqtt which this is based on that monitors the mqtt broker,
check_myrightweight will not publish a response.
check_myrightweight waits to hear a 'pong' sent from the application it is
monitoring in response to the'ping' sent from check_myrightweight.py.
'''
# Copyright (c) 2013-2015 Jan-Piet Mens <jpmens()gmail.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# 3. Neither the name of mosquitto nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
import paho.mqtt.client as paho
import ssl
import time
import sys
import os
import argparse
check_payload = 'ping'
status = 0
message = ''
nagios_codes = [ 'OK', 'WARNING', 'CRITICAL', 'UNKNOWN' ]
def on_connect(mosq, userdata, flags, rc):
"""
Upon successfully being connected, we subscribe to the check_topic
"""
mosq.subscribe(args.check_topic, 0)
def on_publish(mosq, userdata, mid):
pass
def on_subscribe(mosq, userdata, mid, granted_qos):
"""
When the subscription is confirmed, we publish our payload
on the check_topic. Since we're subscribed to this same topic,
on_message() will fire when we see that same message
"""
#(res, mid) = mosq.publish(args.check_topic, check_payload, qos=2, retain=False)
(res, mid) = mosq.publish(args.check_topic, check_payload, qos=2, retain=False)
def on_message(mosq, userdata, msg):
"""
This is invoked when we get our own message back. Verify that it
is actually our message and if so, we've completed a round-trip.
"""
global message
global status
check_this = check_payload
if (args.ignore_ping != None):
check_this = args.ignore_ping
if str(msg.payload == 'ping'): # if we're loooking for a 'pong' from a monitored application skip our ping.
pass
if str(msg.payload) == check_this:
userdata['have_response'] = True
status = 0
elapsed = (time.time() - userdata['start_time'])
message = "Publish to %s at %s responded in %.2f with msg %s" % (args.check_topic, args.mqtt_host, elapsed, msg.payload)
def on_disconnect(mosq, userdata, rc):
if rc != 0:
exitus(1, "Unexpected disconnection. Incorrect credentials?")
def exitus(status=0, message="all is well"):
"""
Produce a Nagios-compatible single-line message and exit according
to status
"""
print "%s - %s" % (nagios_codes[status], message)
sys.exit(status)
parser = argparse.ArgumentParser()
parser.add_argument('-H', '--host', metavar="<hostname>", help="mqtt host to connect to (defaults to localhost)", dest='mqtt_host', default="localhost")
parser.add_argument('-P', '--port', metavar="<port>", help="network port to connect to (defaults to 1883)", dest='mqtt_port', default=1883, type=int)
parser.add_argument('-u', '--username', metavar="<username>", help="username", dest='mqtt_username', default=None)
parser.add_argument('-p', '--password', metavar="<password>", help="password", dest='mqtt_password', default=None)
parser.add_argument('-t', '--topic', metavar="<topic>", help="topic to use for the check (defaults to nagios/test)", dest='check_topic', default='nagios/test')
parser.add_argument('-m', '--max-wait', metavar="<seconds>", help="maximum time to wait for the check (defaults to 4 seconds)", dest='max_wait', default=4, type=int)
parser.add_argument('-i', '--ignoreping', metavar="<ignoreping>", help="ignore ping, test on pong sent from monitored clients", dest='ignore_ping', default=None)
args = parser.parse_args()
userdata = {
'have_response' : False,
'start_time' : time.time(),
}
mqttc = paho.Client('nagios-%d' % (os.getpid()), clean_session=True, userdata=userdata, protocol=4)
mqttc.on_message = on_message
mqttc.on_connect = on_connect
mqttc.on_disconnect = on_disconnect
mqttc.on_publish = on_publish
mqttc.on_subscribe = on_subscribe
#mqttc.tls_set('root.ca',
# cert_reqs=ssl.CERT_REQUIRED,
# tls_version=1)
#mqttc.tls_set('root.ca', certfile='c1.crt', keyfile='c1.key', cert_reqs=ssl.CERT_REQUIRED, tls_version=3, ciphers=None)
#mqttc.tls_insecure_set(True) # optional: avoid check certificate name if true
# username & password may be None
if args.mqtt_username is not None:
mqttc.username_pw_set(args.mqtt_username, args.mqtt_password)
# Attempt to connect to broker. If this fails, issue CRITICAL
try:
mqttc.connect(args.mqtt_host, args.mqtt_port, 60)
except Exception, e:
status = 2
message = "Connection to %s:%d failed: %s" % (args.mqtt_host, args.mqtt_port, str(e))
exitus(status, message)
rc = 0
while userdata['have_response'] == False and rc == 0:
rc = mqttc.loop()
if time.time() - userdata['start_time'] > args.max_wait:
message = 'timeout waiting for PUB'
status = 2
break
mqttc.disconnect()
exitus(status, message)