#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Copyright (C) 2019 tribe29 GmbH - License: GNU General Public License v2
# This file is part of Checkmk (https://checkmk.com). It is subject to the terms and
# conditions defined in the file COPYING, which is part of this source code package.

# <<<mongodb_mem>>>
# resident 856
# supported True
# virtual 6100
# mappedWithJournal 5374
# mapped 2687
# bits 64
# note fields vary by platform
# page_faults 86
# heap_usage_bytes 65501032


def parse_mongodb_mem(info):
    parsed = {}
    for line in info:
        key, value = line[0], " ".join(line[1:])
        try:
            parsed[key] = int(value)
        except ValueError:
            parsed[key] = value
    return parsed


def check_mongodb_mem(_no_item, params, parsed):

    for key in ("resident", "virtual", "mapped"):
        if key in parsed:  # 'mapped' only for the MMAPv1 storage engine, deprecated with 4x
            value_bytes = parsed[key] * 1024**2
            levels = params.get("%s_levels" % key, (None, None))
            yield check_levels(
                value_bytes,
                "process_%s_size" % key,
                levels,
                human_readable_func=get_bytes_human_readable,
                infoname="%s usage" % key.title(),
            )

    # MongoDB doc: If virtual value is significantly larger than mapped (e.g. 3 or more times),
    #              this may indicate a memory leak.
    if parsed.get("mapped"):  # present, non-zero
        virt_mapped_factor = parsed["virtual"] / float(parsed["mapped"])
        if virt_mapped_factor >= 3:
            textfmt = "Virtual size is %.1f times the mapped size (possible memory leak)"
            yield 1, textfmt % virt_mapped_factor


check_info["mongodb_mem"] = {
    "parse_function": parse_mongodb_mem,
    "inventory_function": discover_single,
    "check_function": check_mongodb_mem,
    "service_description": "Memory used MongoDB",
    "group": "mongodb_mem",
    "has_perfdata": True,
}
