#!/usr/bin/python3
#
# Univention Monitoring Plugin
#  check slapd's/udl's mdb maxsize
#
# Copyright 2007-2022 Univention GmbH
#
# https://www.univention.de/
#
# All rights reserved.
#
# The source code of this program is made available
# under the terms of the GNU Affero General Public License version 3
# (GNU AGPL V3) as published by the Free Software Foundation.
#
# Binary versions of this program provided by Univention to you as
# well as other copyrighted, protected or trademarked materials like
# Logos, graphics, fonts, specific documentations and configurations,
# cryptographic keys etc. are subject to a license agreement between
# you and Univention and not subject to the GNU AGPL V3.
#
# In the case you use this program under the terms of the GNU AGPL V3,
# the program is provided in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public
# License with the Debian GNU/Linux or Univention distribution in file
# /usr/share/common-licenses/AGPL-3; if not, see
# <https://www.gnu.org/licenses/>.

import sys
import subprocess

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


class MDBMaxsize(Alert):

	def write_metrics(self):
		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, 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(metric_name, -1)
			self.log.debug('mdb_stat not found, please install lmdb-utils.')
			return
		except subprocess.CalledProcessError:
			self.write_metric(metric_name, 1)
			self.log.debug('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:
			in_use = (int(stat['number of pages used']) - int(stat['free pages'])) * 100 / int(stat['max pages'])
		except KeyError:  # API change in the future
			self.write_metric(metric_name, 1)
			self.log.debug('output of "mdb_stat -e %s" could not be parsed: %s' % (mdb_dir, output,))
			return

		self.write_metric(metric_name, in_use)
		self.log.debug(mdb_dir)


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