#!/usr/bin/python3
#
# Univention Monitoring
#
# SPDX-FileCopyrightText: 2004-2025 Univention GmbH
# SPDX-License-Identifier: AGPL-3.0-only

import os
import subprocess

from univention.monitoring import Alert


FAILED_LDIF_FN = '/var/lib/univention-directory-replication/failed.ldif'


class ReplicationCheck(Alert):

    def write_metrics(self):
        # CRITICAL if failed.ldif exists
        self.write_metric('univention_listener_failed_ldif_exists', 1 if os.path.exists(FAILED_LDIF_FN) else 0)

        # get actual transaction id
        try:
            result = subprocess.check_output(['/usr/share/univention-directory-listener/get_notifier_id.py'])
            notifier_id = int(result.decode("utf-8", "replace").rstrip())
        except (ValueError, subprocess.CalledProcessError) as exc:
            self.log.debug('Could not get notifier ID: %s', exc)
            self.write_metric('univention_listener_replication_difference', -1)  # FIXME:
            return

        try:
            with open('/var/lib/univention-directory-listener/notifier_id') as fd:
                listener_id = int(fd.read().rstrip())
        except (ValueError, OSError) as exc:
            self.log.debug('Could not get listener ID: %s', exc)
            self.write_metric('univention_listener_replication_difference', -1)  # FIXME:
            return

        self.write_metric('univention_listener_replication_difference', notifier_id - listener_id)


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