#!/usr/bin/python3
#
# Univention Monitoring Plugin
#  check slapd's/udl's mdb maxsize
#
# SPDX-FileCopyrightText: 2007-2025 Univention GmbH
# SPDX-License-Identifier: AGPL-3.0-only

import subprocess
import sys

from univention.config_registry import ucr
from univention.monitoring import Alert


class MDBMaxsize(Alert):

    def write_metrics(self):
        if ucr['server/role'] not in ('domaincontroller_master', 'domaincontroller_backup', 'domaincontroller_slave'):
            return
        self.write_metric_for_folder(
            'univention_listener_mdb_size_used_ratio',
            '/var/lib/univention-directory-listener/cache',
        )
        if ucr.get('ldap/database/type') == 'mdb':
            self.write_metric_for_folder(
                'univention_slapd_mdb_size_used_ratio',
                '/var/lib/univention-ldap/ldap',
            )
        if sys.maxsize > 2 ** 32:
            self.write_metric_for_folder(
                'univention_slapd_translog_mdb_size_used_ratio',
                '/var/lib/univention-ldap/translog',
            )

    def write_metric_for_folder(self, mdb_stat_metric_name, mdb_dir):
        try:
            output = subprocess.check_output(['/usr/bin/mdb_stat', '-ef', mdb_dir], close_fds=True, env={'LC_ALL': 'C'})
        except FileNotFoundError:
            self.write_metric(mdb_stat_metric_name, -1)
            self.log.error('mdb_stat not found, please install lmdb-utils.')
            return
        except subprocess.CalledProcessError:
            self.write_metric(mdb_stat_metric_name, 1)
            self.log.error('mdb_stat -ef %s failed', mdb_dir)
            return

        output = output.decode("utf-8", "replace")
        stat = dict(line.strip().lower().split(': ', 1) for line in output.splitlines() if ': ' in line)

        try:
            free_pages = int(stat['free pages'])
            in_use_vs_untouched_pages = (int(stat['number of pages used']) - free_pages) * 100 / (int(stat['max pages']) - free_pages)
        except KeyError:  # API change in the future
            self.write_metric(mdb_stat_metric_name, 1)
            self.log.error('output of "mdb_stat -e %s" could not be parsed: %s', mdb_dir, output)
            return

        self.write_metric(mdb_stat_metric_name, round(in_use_vs_untouched_pages, 2))
        self.log.debug(mdb_dir)


if __name__ == '__main__':
    MDBMaxsize.main()
