New plugin: check_collectd (proof of concept)

check_collectd.py

@@ -0,0 +1,141 @@
+#!/usr/bin/env python
+# -*- encoding: utf-8 -*-
+
+#####################################################################
+# (c) 2016 by Sven Velt, Germany                                    #
+#             sven-mymonplugins@velt.biz                            #
+#                                                                   #
+# This file is part of "velt.biz - My Monitoring Plugins"           #
+# a fork of "team(ix) Monitoring Plugins" in 2015                   #
+# URL: https://gogs.velt.biz/velt.biz/MyMonPlugins/                 #
+#                                                                   #
+# This file is free software: you can redistribute it and/or modify #
+# it under the terms of the GNU General Public License as published #
+# by the Free Software Foundation, either version 2 of the License, #
+# or (at your option) any later version.                            #
+#                                                                   #
+# This file 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 General Public License for more details.                      #
+#                                                                   #
+# You should have received a copy of the GNU General Public License #
+# along with this file. If not, see <http://www.gnu.org/licenses/>. #
+#####################################################################
+
+import os
+import re
+import socket
+import sys
+
+from collections import OrderedDict
+
+try:
+	from monitoringplugin import MonitoringPlugin
+except ImportError:
+	print '=========================='
+	print 'AIKS! Python import error!'
+	print '==========================\n'
+	print 'Could not find "monitoringplugin.py"!\n'
+	print 'Did you download "%s"' % os.path.basename(sys.argv[0])
+	print 'without "monitoringplugin.py"?\n'
+	print 'Please go back to'
+	print 'https://gogs.velt.biz/velt.biz/MyMonPlugins and download it,'
+	print 'or even better:'
+	print 'get a full archive at http://gogs.velt.biz/velt.biz/MyMonPlugins/releases\n'
+	sys.exit(127)
+
+
+plugin = MonitoringPlugin(
+		pluginname='check_collectd',
+		tagforstatusline='COLLECTD',
+		description='Check values of collectd server',
+		version='0.1',
+	)
+
+SOCKPATHs= [
+		'/var/run/collectd-unixsock',
+	]
+
+plugin.add_cmdlineoption('-S', '--socket', 'socket', 'path to socket of collectd', default=None)
+plugin.add_cmdlineoption('-H', '--host', 'host', 'Hostname (in collectd) to check', default=None)
+plugin.add_cmdlineoption('-V', '--value_spec', 'var', 'value to from collectd', default=None)
+plugin.add_cmdlineoption('-w', '', 'warn', 'warning thresold', default=None)
+plugin.add_cmdlineoption('-c', '', 'crit', 'warning thresold', default=None)
+
+plugin.parse_cmdlineoptions()
+
+if not plugin.options.host:
+	plugin.back2nagios(3, 'Need a hostname (-H/--hostname) to check!')
+
+if not plugin.options.var:
+	plugin.back2nagios(3, 'Need a value_spec (-V/--value_spec) to check!')
+
+
+# FIXME: New method: find path (file or dir) and test we can read/write from/to it
+if not plugin.options.socket:
+	plugin.verbose(2, "Auto-detecting path to collectd's unixsock...")
+	for sockpath in SOCKPATHs:
+		if os.path.exists(sockpath):
+			plugin.options.socket = sockpath
+			plugin.verbose(2, 'Found it at "%s"' % sockpath)
+			break
+
+if not plugin.options.socket:
+	plugin.back2nagios(3, 'Need a socket path (-S/--socket) to connecto to')
+
+if not os.access(plugin.options.socket, os.W_OK):
+	plugin.back2nagios(3, 'Could not read from socket "%s"' % plugin.options.socket)
+# FIXME: End
+
+s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+s.connect(plugin.options.socket)
+command = 'GETVAL "%s/%s"\n' % (plugin.options.host, plugin.options.var)
+plugin.verbose(3, 'Socket command: %s' % command.rstrip())
+s.send(command)
+s.shutdown(socket.SHUT_WR)
+
+answer = ''
+try:
+	while True:
+		s.settimeout(10)
+		data = s.recv(32768)
+		if data:
+			answer += data
+		else:
+			break
+except socket.timeout:
+	plugin.back2nagios(3, 'Timeout while reading from socket')
+
+answer = answer.split('\n')
+plugin.verbose(3, 'Socket answer: %s' % answer)
+
+(status, text) = answer.pop(0).split(' ', 1)
+try:
+	status = long(status)
+except ValueError:
+	plugin.back2nagios(3, 'Unknown answer from socket: "%s"' % answer[0])
+
+plugin.verbose(3, 'Socket status code: %s' % status)
+if status < 0:
+	plugin.back2nagios(3, 'Collectd error: "%s"' % text)
+
+answer = answer[:status]
+answer = OrderedDict( [ (p[0], float(p[1])) for p in [ p.split('=') for p in answer ] ] )
+
+for (key,value) in answer.iteritems():
+	returncode = plugin.value_wc_to_returncode(value, plugin.options.warn, plugin.options.crit)
+	longoutput = '%s: %s' % (key, value)
+	perfdata={
+			'label': key,
+			'value': value,
+			'unit': '',
+			'warn': plugin.options.warn,
+			'crit': plugin.options.crit,
+		}
+	
+	plugin.remember_check(key, returncode, longoutput, perfdata=[perfdata,])
+
+plugin.brain2output()
+plugin.exit()
+