#!/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.

# Example Agent Output:
# GENUA-MIB:

#.1.3.6.1.4.1.3137.2.1.2.1.2.9 = STRING: "carp0"
#.1.3.6.1.4.1.3137.2.1.2.1.2.10 = STRING: "carp1"
#.1.3.6.1.4.1.3137.2.1.2.1.4.9 = INTEGER: 2
#.1.3.6.1.4.1.3137.2.1.2.1.4.10 = INTEGER: 2
#.1.3.6.1.4.1.3137.2.1.2.1.7.9 = INTEGER: 2
#.1.3.6.1.4.1.3137.2.1.2.1.7.10 = INTEGER: 2


def inventory_genua_carp(info):
    inventory = []

    # remove empty elements due to two alternative enterprise ids in snmp_info
    info = filter(None, info)

    if info[0]:
        for ifName, _ifLinkState, ifCarpState in info[0]:
            if ifCarpState in ["0", "1", "2"]:
                inventory.append((ifName, None))
    return inventory


def genua_linkstate(st):
    names = {
        '0': 'unknown',
        '1': 'down',
        '2': 'up',
        '3': 'hd',
        '4': 'fd',
    }
    return names.get(st, st)


def genua_carpstate(st):
    names = {
        '0': 'init',
        '1': 'backup',
        '2': 'master',
    }
    return names.get(st, st)


def check_genua_carp(item, _no_params, info):

    # remove empty elements due to two alternative enterprise ids in snmp_info
    info = filter(None, info)

    if not info[0]:
        return (3, "Invalid Output from Agent")
    state = 0
    nodes = len(info)
    masters = 0
    output = ""
    if nodes > 1:
        prefix = "Cluster test: "
    else:
        prefix = "Node test: "

    # Loop over all nodes, just one line if not a cluster
    for line in info:
        # Loop over interfaces on node
        for ifName, ifLinkState, ifCarpState in line:
            ifLinkStateStr = genua_linkstate(str(ifLinkState))
            ifCarpStateStr = genua_carpstate(str(ifCarpState))
            # is inventorized interface in state carp master ?
            if ifName == item and ifCarpState == "2":
                # is master
                masters += 1
                if masters == 1:
                    if nodes > 1:
                        output = "one "
                    output += "node in carp state %s with IfLinkState %s" \
                        % (ifCarpStateStr,ifLinkStateStr)
                    # first master
                    if ifLinkState == "2":
                        state = 0
                    elif ifLinkState == "1":
                        state = 2
                    elif ifLinkState in ["0", "3"]:
                        state = 1
                    else:
                        state = 3
                else:
                    state = 2
                    output = "%d nodes in carp state %s on cluster with %d nodes" \
                            % (masters,ifCarpStateStr,nodes)
            # look for non-masters, only interesting if no cluster
            elif ifName == item and nodes == 1:
                output = "node in carp state %s with IfLinkState %s" \
                    % (ifCarpStateStr,ifLinkStateStr)
                # carp backup
                if ifCarpState == "1" and ifLinkState == "1":
                    state = 0
                else:
                    state = 1

    # no masters found in cluster
    if nodes > 1 and masters == 0:
        state = 2
        output = "No master found on cluster with %d nodes" % nodes

    output = prefix + output
    return (state, output)


check_info['genua_carp'] = {
    "inventory_function": inventory_genua_carp,
    "check_function": check_genua_carp,
    "service_description": "Carp Interface %s",
    "snmp_info": [
        (
            ".1.3.6.1.4.1.3137.2.1.2",
            [
                "1.2",  # "ifName"
                "1.4",  # "ifLinkState"
                "1.7",  # "ifCarpState"
            ]),
        (
            ".1.3.6.1.4.1.3717.2.1.2",
            [
                "1.2",  # "ifName"
                "1.4",  # "ifLinkState"
                "1.7",  # "ifCarpState"
            ]),
    ],
    "snmp_scan_function": scan_genua,
    "includes": ["genua.include"],
}
