#!/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.

# <<<postgres_connections>>>
# [databases_start]
# postgres
# zweitedb
# datenbank
# [databases_end]
# datenbank;0;100
# postgres;2;100
# template0;0;100
# template1;0;100

# instances
# <<<postgres_bloat>>>
# [[[foobar]]]
# [databases_start]
# postgres
# testdb
# [databases_end]
# ...


factory_settings["postgres_connections_default_levels"] = {
    'levels_perc': (80.0, 90.0), # Levels at 80%/90% of maximum
}


def inventory_postgres_connections(parsed):
    return [ (db, {}) for db, dbinfo in parsed.items() ]


def check_postgres_connections(item, params, parsed):
    if item not in parsed:
        # In case of missing information we assume that the login into
        # the database has failed and we simply skip this check. It won't
        # switch to UNKNOWN, but will get stale.
        raise MKCounterWrapped("Login into database failed")

    database = parsed[item]
    warn, crit = params.get("levels_abs", (0,0))
    if database == []:
        yield 0, "No active query", [("connections", 0, warn, crit, 0, 0)]
        return

    current = float(database[0]["current"])
    maximum = float(database[0]["mc"])
    used_perc = current / maximum * 100

    state = 0
    extra_info = ""
    if "levels_abs" in params:
        warn, crit = params["levels_abs"]
        if current >= crit:
            state = 2
        elif current >= warn:
            state = 1
        if state :
            extra_info = " (Levels at %s/%s)" % (warn, crit)
    yield state, "Used connections %d%s" % (current, extra_info),\
                    [("connections", current, warn, crit, 0, maximum)]

    state = 0
    extra_info = ""
    warn, crit = params["levels_perc"]
    if used_perc >= crit:
        state = 2
    elif used_perc >= warn:
        state = 1
    if state:
        extra_info = " (Levels at %s%%/%s%%)" % (warn, crit)
    yield state, "Used percentage %.0f%%%s" % (used_perc, extra_info)


check_info['postgres_connections'] = {
    "parse_function"          : parse_postgres_dbs,
    "check_function"          : check_postgres_connections,
    "inventory_function"      : inventory_postgres_connections,
    "service_description"     : "PostgreSQL Connections %s",
    "group"                   : "db_connections",
    "has_perfdata"            : True,
    "default_levels_variable" : "postgres_connections_default_levels",
    "includes"                : [ "postgres.include" ]
}

