#!/usr/bin/python
# -*- encoding: utf-8; py-indent-offset: 4 -*-
# +------------------------------------------------------------------+
# |             ____ _               _        __  __ _  __           |
# |            / ___| |__   ___  ___| | __   |  \/  | |/ /           |
# |           | |   | '_ \ / _ \/ __| |/ /   | |\/| | ' /            |
# |           | |___| | | |  __/ (__|   <    | |  | | . \            |
# |            \____|_| |_|\___|\___|_|\_\___|_|  |_|_|\_\           |
# |                                                                  |
# | Copyright Mathias Kettner 2014             mk@mathias-kettner.de |
# +------------------------------------------------------------------+
#
# This file is part of Check_MK.
# The official homepage is at http://mathias-kettner.de/check_mk.
#
# check_mk 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 in version 2.  check_mk is  distributed
# in the hope that it will be useful, but WITHOUT ANY WARRANTY;  with-
# out even the implied warranty of  MERCHANTABILITY  or  FITNESS FOR A
# PARTICULAR PURPOSE. See the  GNU General Public License for more de-
# tails. You should have  received  a copy of the  GNU  General Public
# License along with GNU Make; see the file  COPYING.  If  not,  write
# to the Free Software Foundation, Inc., 51 Franklin St,  Fifth Floor,
# Boston, MA 02110-1301 USA.


# Measures total allocated file handles.
# The output displays
#  - the number of allocated file handles
#  - the number of allocatedly used file handles (with the 2.4 kernel); or
#    the number of allocatedly unused file handles (with the 2.6 kernel)
#  - the maximum files handles that can be allocated
#    (can also be found in /proc/sys/fs/file-max)
# Example output of '/proc/sys/fs/file-nr':
# <<<filehandler>>>
# 9376	0	817805


factory_settings['filehandler_default_levels'] = {
    'levels': (80.0, 90.0)
}

def inventory_filehandler(info):
    return [ ( None, {} ) ]

def check_filehandler(_no_item, params, info):
    allocated, used_or_unused, maximum = info[0]
    state = 0
    perc = float(allocated) / float(maximum) * 100.0
    infotext = '%.1f%% used (%s of %s file handles)' % (perc, allocated, maximum)
    warn, crit = params['levels']

    if perc >= crit:
        state = 2
    elif perc >= warn:
        state = 1
    if state > 0:
        infotext += ' (warn/crit at %.1f%%/%.1f%%)' % (warn, crit)

    return state, infotext, [ ( 'filehandler_perc', perc, warn, crit ) ]

check_info['filehandler'] = {
    'check_function'            : check_filehandler,
    'inventory_function'        : inventory_filehandler,
    'service_description'       : 'Filehandler',
    'has_perfdata'              : True,
    'default_levels_variable'   : 'filehandler_default_levels',
    'group'                     : 'filehandler',
}
