#!/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.


# Agent / MIB output
# see: 1.3.6.1.4.1.3375.2.2.5.1.2.1
# F5-BIGIP-LOCAL-MIB::ltmPoolName.              8.80.111.111.108.asci_encoded_str = Pool_NMA
# F5-BIGIP-LOCAL-MIB::ltmPoolMemberCnt.         8.80.111.111.108.95.78.77.65 = 2
# F5-BIGIP-LOCAL-MIB::ltmPoolActiveMemberCnt.   8.80.111.111.108.95.78.77.65 = 0

# warn, crit numbers of pool members
f5_bigip_pool_default_levels = (2, 1)

def parse_f5_bigip_pool(info):
    parsed = {}
    processed_member_info = False
    for block in info:
        # Member information
        if len(block[0]) == 3 and processed_member_info:
            break

        if len(block[0]) == 3:
            for line in block:
                parsed.setdefault(line[0], {"act_members": 0, "def_members": 0, "down_info": []})
                parsed[line[0]]["act_members"] += int(line[1])
                parsed[line[0]]["def_members"] += int(line[2])
            processed_member_info = True

        # Status information
        elif len(block[0]) == 6:
            for key in parsed.keys():
                for line in block:
                    if key == line[0]:
                         parsed[key]["down_info"].append(line)
    return parsed

def inventory_f5_bigip_pool(parsed):
# inventorize all pools and their member count
    for item in parsed.keys():
        if item != "":
            yield item, "f5_bigip_pool_default_levels"

def f5_bigip_pool_get_down_members(down_info):
    downs = []
    for line in down_info:
        if (line[2] != '4' or line[3] != '4' or line[4] in ('2', '3', '4', '5' )):
            if re.match("\/\S*\/\S*", line[5]):
                host = line[5].split("/")[2]
            else:
                host = line[5]
            downs.append(host+":"+line[1])
    return downs

def check_f5_bigip_pool(item, params, parsed):
    warn, crit       = params

    pool_info = parsed.get(item)
    if not pool_info:
        return

    pool_act_members = pool_info["act_members"]
    pool_def_members = pool_info["def_members"]
    message = "%d of %d members are up" % ( pool_act_members, pool_def_members )
    state = 0
    if pool_act_members == pool_def_members or pool_act_members >= warn:
        state = 0
    elif pool_act_members < crit:
        state = 2
        message += " (warn/crit: %s/%s)" % ( warn, crit )
    elif pool_act_members < warn:
        state = 1
        message += " (warn/crit: %s/%s)" % ( warn, crit )

    if pool_act_members < pool_def_members:
        downs = f5_bigip_pool_get_down_members(pool_info["down_info"])
        if downs:
            message += ", down/disabled nodes: %s" % ", ".join(downs)
    return state, message

check_info["f5_bigip_pool"] = {
    'parse_function'        : parse_f5_bigip_pool,
    'check_function'        : check_f5_bigip_pool,
    'group'                 : 'f5_pools',
    'inventory_function'    : inventory_f5_bigip_pool,
    'service_description'   : 'Load Balancing Pool %s',
    'snmp_info'             : [
            ('.1.3.6.1.4.1.3375.2.2.5.1.2.1', [
                    1, # ltmPoolEntry
                    8, # ltmPoolActiveMemberCnt
                    23, # ltmPoolMemberCnt
                ]),
            ('.1.3.6.1.4.1.3375.2.2.5.3.2.1', [
                    1, # ltmPoolMemberPoolName
                    4, # ltmPoolMemberPort
                    10, # ltmPoolMemberMonitorState
                    11, # ltmPoolMemberMonitorStatus
                    13, # ltmPoolMemberSessionStatus
                    19, # ltmPoolMemberNodeName
                ]),
        ],
    'snmp_scan_function':      \
     lambda oid: '.1.3.6.1.4.1.3375.2' in oid(".1.3.6.1.2.1.1.2.0") \
        and "big-ip" in oid(".1.3.6.1.4.1.3375.2.1.4.1.0").lower(),
}
