#!/usr/bin/python
# -*- encoding: utf-8; py-indent-offset: 4 -*-
# +------------------------------------------------------------------+
# |             ____ _               _        __  __ _  __           |
# |            / ___| |__   ___  ___| | __   |  \/  | |/ /           |
# |           | |   | '_ \ / _ \/ __| |/ /   | |\/| | ' /            |
# |           | |___| | | |  __/ (__|   <    | |  | | . \            |
# |            \____|_| |_|\___|\___|_|\_\___|_|  |_|_|\_\           |
# |                                                                  |
# | Copyright Mathias Kettner 2010             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.                                 |
#   +----------------------------------------------------------------------+

memused_default_levels = (150.0, 200.0)
mem_extended_perfdata = False

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(item, params, info):
    try:
        meminfo = parse_proc_meminfo(info)
        swapused = meminfo['SwapTotal'] - meminfo['SwapFree']
        memused  = meminfo['MemTotal']  - meminfo['MemFree']
        # Buffers and Cached are optional (not supported on Windows yet)
        caches   = meminfo.get('Buffers', 0) + meminfo.get('Cached', 0)
    except:
        return (3, "UNKNOWN - invalid output from plugin")

    # Add extended memory performance data, if this is
    # enabled and the agent provides that information.
    extended_perf = []
    extrainfo = ""
    if mem_extended_perfdata:
        mapped = meminfo.get('Mapped')
        if mapped:
            mapped_mb = int(mapped) / 1024
            committed_as = meminfo.get('Committed_AS')
            if committed_as:
                committed_as_mb = int(committed_as) / 1024
            else:
                committed_as = 0
            extended_perf = [
                ('mapped',       str(mapped_mb)       + 'MB', '', '', 0, ''),
                ('committed_as', str(committed_as_mb) + 'MB', '', '', 0, ''),
            ]
            extrainfo = ", %.1f GB mapped, %.1f GB committed" % \
                        (mapped_mb / 1024.0, committed_as_mb / 1024.0)

    totalused_kb = (swapused + memused - caches)
    totalused_mb = totalused_kb / 1024
    totalmem_kb = meminfo['MemTotal']
    totalmem_mb = totalmem_kb / 1024
    totalused_perc = 100 * (float(totalused_kb) / float(totalmem_kb))
    totalvirt_mb = (meminfo['SwapTotal'] + meminfo['MemTotal']) / 1024
    warn, crit = params

    perfdata = [
        ('ramused', str( (memused - caches) / 1024) + 'MB', '', '', 0, totalmem_mb),
        ('swapused', str(swapused / 1024) + 'MB', '', '', 0, meminfo['SwapTotal']/1024) ]

    # levels may be given either in int -> MB or in float -> percentages

    infotext = ("%.2f GB used (%.2f GB RAM + %.2f GB SWAP, this is %.1f%% of %.2f GB RAM)" % \
               (totalused_mb / 1024.0, (memused-caches) / 1024.0 / 1024, swapused / 1024.0 / 1024,
               totalused_perc, totalmem_mb / 1024.0)) \
               + extrainfo

    if type(warn) == float:
        perfdata.append(('memused', str(totalused_mb)+'MB', int(warn/100.0 * totalmem_mb),
                        int(crit/100.0 * totalmem_mb), 0, totalvirt_mb))
        perfdata += extended_perf
        if totalused_perc >= crit:
            return (2, 'CRIT - %s, critical at %.1f%%' % (infotext, crit), perfdata)
        elif totalused_perc >= warn:
            return (1, 'WARN - %s, warning at %.1f%%' % (infotext, warn), perfdata)
        else:
            return (0, 'OK - %s' % infotext, perfdata)

    else:
        perfdata.append(('memused', str(totalused_mb)+'MB', warn, crit, 0, totalvirt_mb))
        perfdata += extended_perf
        if totalused_mb >= crit:
            return (2, 'CRIT - %s, critical at %.2f GB' % (infotext, crit / 1024.0), perfdata)
        elif totalused_mb >= warn:
            return (1, 'WARN - %s, warning at %.2f GB' % (infotext, warn / 1024.0), perfdata)
        else:
            return (0, 'OK - %s' % infotext, perfdata)


check_info['mem.used'] = (check_mem_used, "Memory used", 1,  inventory_mem_used)
check_config_variables.append("mem_extended_perfdata")


#   +----------------------------------------------------------------------+
#   |                                                _                     |
#   |              _ __ ___   ___ _ __ ___ __      _(_)_ __                |
#   |             | '_ ` _ \ / _ \ '_ ` _ \\ \ /\ / / | '_ \               |
#   |             | | | | | |  __/ | | | | |\ 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)


#   +----------------------------------------------------------------------+
#   |                                                   _ _                |
#   |    _ __ ___   ___ _ __ ___ __   ___ __ ___   __ _| | | ___   ___     |
#   |   | '_ ` _ \ / _ \ '_ ` _ \\ \ / / '_ ` _ \ / _` | | |/ _ \ / __|    |
#   |   | | | | | |  __/ | | | | |\ 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)
