#!/usr/bin/python
# -*- encoding: utf-8; py-indent-offset: 4 -*-
# +------------------------------------------------------------------+
# |             ____ _               _        __  __ _  __           |
# |            / ___| |__   ___  ___| | __   |  \/  | |/ /           |
# |           | |   | '_ \ / _ \/ __| |/ /   | |\/| | ' /            |
# |           | |___| | | |  __/ (__|   <    | |  | | . \            |
# |            \____|_| |_|\___|\___|_|\_\___|_|  |_|_|\_\           |
# |                                                                  |
# | Copyright Mathias Kettner 2013             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-
# ails.  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.


#   +----------------------------------------------------------------------+
#   |                                                        _             |
#   |           _ __ ___   ___ _ __ ___   _   _ ___  ___  __| |            |
#   |          | '_ ` _ \ / _ \ '_ ` _ \ | | | / __|/ _ \/ _` |            |
#   |          | | | | | |  __/ | | | | || |_| \__ \  __/ (_| |            |
#   |          |_| |_| |_|\___|_| |_| |_(_)__,_|___/\___|\__,_|            |
#   |                                                                      |
#   +----------------------------------------------------------------------+
#   | Memory check that takes into account the swap space. This check is   |
#   | used for unixoide operating systems.                                 |
#   +----------------------------------------------------------------------+

def parse_proc_meminfo(info):
    return dict([ (i[0][:-1], int(i[1])) for i in info ])

def inventory_mem_used(info):
    meminfo = parse_proc_meminfo(info)
    if "MemTotal" in meminfo and \
        "PageTotal" not in meminfo: # This case is handled by mem.win
        return [(None, "memused_default_levels")]

def check_mem_used(_no_item, params, info):
    meminfo = parse_proc_meminfo(info)
    return check_memory(params, meminfo)

check_info['mem.used'] = {
    "check_function"         : check_mem_used,
    "inventory_function"     : inventory_mem_used,
    "service_description"    : "Memory used",
    "has_perfdata"           : True,
    "group"                  : "memory",
    "check_config_variables" : [ "mem_extended_perfdata" ],
    "includes"               : [ "mem.include" ],
}


#   +----------------------------------------------------------------------+
#   |                                                _                     |
#   |              _ __ ___   ___ _ __ ___ __      _(_)_ __                |
#   |             | '_ ` _ \ / _ \ '_ ` _ \\ \ /\ / / | '_ \               |
#   |             | | | | | |  __/ | | | | |\ V  V /| | | | |              |
#   |             |_| |_| |_|\___|_| |_| |_(_)_/\_/ |_|_| |_|              |
#   |                                                                      |
#   +----------------------------------------------------------------------+
#   | Windows now has a dedicated memory check that reflect the special    |
#   | nature of the page file.                                             |
#   +----------------------------------------------------------------------+

# Special memory and page file check for Windows
check_default_levels['mem.win'] = "memory_win_default_levels"
factory_settings["memory_win_default_levels"] = {
    "memory"   : ( 80.0, 90.0 ),
    "pagefile" : ( 50.0, 70.0 ),
}

def inventory_mem_win(info):
    meminfo = parse_proc_meminfo(info)
    if "PageTotal" in meminfo:
        return [(None, {})]

def check_mem_windows(item, params, info):
    meminfo = parse_proc_meminfo(info)
    perfdata = []
    infotxts = []
    MB = 1024.0 * 1024
    worststate = 0
    for title, what, paramname in [
        ( "Memory",    "Mem",  "memory" ),
        ( "Page file", "Page", "pagefile" )]:
        total_kb = meminfo[what + "Total"]
        free_kb  = meminfo[what + "Free"]
        used_kb  = total_kb - free_kb
        used_mb  = used_kb / 1024.0
        free_mb  = free_kb / 1024.0
        perc     = 100.0 * used_kb / total_kb

        # Now check the levels
        warn, crit = params[paramname]
        if (type(crit) == int and free_mb <= crit) or \
            (type(crit) == float and perc >= crit):
            worststate = 2
            state_code = '(!!)'
        elif (type(warn) == int and free_mb <= warn) or \
            (type(warn) == float and perc >= warn):
            worststate = max(worststate, 1)
            state_code = '(!)'
        else:
            state_code = ""

        # Convert levels to absolute values (for perfdata)
        if type(warn) == float:
            warn = total_kb * warn / 100 / 1024
        if type(crit) == float:
            crit = total_kb * crit / 100 / 1024

        infotxts.append("%s usage: %.1f%% (%.1f/%.1f GB)%s" %
                (title, perc, used_kb / MB, total_kb / MB, state_code))
        perfdata.append((paramname, used_kb / 1024.0, warn, crit, 0, total_kb / 1024.0))

    return (worststate, "%s - %s" %
            (nagios_state_names[worststate], ", ".join(infotxts)), perfdata)


check_info['mem.win'] = (check_mem_windows, "Memory and pagefile", 1, inventory_mem_win)
checkgroup_of['mem.win'] = "memory_pagefile_win"


#   +----------------------------------------------------------------------+
#   |                                                   _ _                |
#   |    _ __ ___   ___ _ __ ___ __   ___ __ ___   __ _| | | ___   ___     |
#   |   | '_ ` _ \ / _ \ '_ ` _ \\ \ / / '_ ` _ \ / _` | | |/ _ \ / __|    |
#   |   | | | | | |  __/ | | | | |\ V /| | | | | | (_| | | | (_) | (__     |
#   |   |_| |_| |_|\___|_| |_| |_(_)_/ |_| |_| |_|\__,_|_|_|\___/ \___|    |
#   |                                                                      |
#   +----------------------------------------------------------------------+
#   | This very specific check checks the usage and fragmentation of the   |
#   | address space 'vmalloc' that can be problematic on 32-Bit systems.   |
#   +----------------------------------------------------------------------+

# warn, crit, warn_chunk, crit_chunk. Integers are in MB, floats are in percent
mem_vmalloc_default_levels = ( 80.0, 90.0, 64, 32 )

def inventory_mem_vmalloc(info):
    meminfo = parse_proc_meminfo(info)
    if "VmallocTotal" in meminfo:
        # Do not checks this on 64 Bit systems. They have almost
        # infinitive vmalloc
        vmalloc = meminfo["VmallocTotal"] / 1024.4
        if vmalloc < 4096:
            return [ (None, "mem_vmalloc_default_levels") ]
    return []

def check_mem_vmalloc(item, params, info):
    meminfo = parse_proc_meminfo(info)
    total_mb = meminfo["VmallocTotal"] / 1024.0
    used_mb  = meminfo["VmallocUsed"] / 1024.0
    free_mb  = total_mb - used_mb
    chunk_mb = meminfo["VmallocChunk"] / 1024.0
    warn, crit, warn_chunk, crit_chunk = params

    state = 0
    infotxts = []
    perfdata = []
    for var, w, c, v, neg, what in [
        ( "used",  warn,       crit,       used_mb,  False, "used" ),
        ( "chunk", warn_chunk, crit_chunk, chunk_mb, True,  "largest chunk" )]:

        # convert levels from percentage to MB values
        if type(w) == float:
            w_mb = total_mb * w / 100
        else:
            w_mb = float(w)

        if type(c) == float:
            c_mb = total_mb * c / 100
        else:
            c_mb = float(c)

        infotxt = "%s %.1f MB" % (what, v)
        if (v >= c_mb) != neg:
            s = 2
            infotxt += " (critical at %.1f MB!!)" % c_mb
        elif (v >= w_mb) != neg:
            s = 1
            infotxt += " (warning at %.1f MB!)" % w_mb
        else:
            s = 0
        state = max(state, s)
        infotxts.append(infotxt)
        perfdata.append( (var, v, w_mb, c_mb, 0, total_mb) )
    return (state, nagios_state_names[state] + (" - total %.1f MB, " % total_mb) + ", ".join(infotxts), perfdata)

check_info["mem.vmalloc"] = (check_mem_vmalloc, "Vmalloc address space", 1, inventory_mem_vmalloc)
