#!/usr/bin/python3
#
# Univention Monitoring Plugin
#  check_univention_s4_connector: check s4 connector status
#
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# Copyright 2015-2024 Univention GmbH
#
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# 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.
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import re
import subprocess

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


RE_REJECT = re.compile(r'^ *[1-9]+: *(S4|UCS) DN:.*')


class S4Connector(Alert):

    def write_metrics(self):
        # check whether the s4 connector is activated
        if not ucr.is_true('connector/s4/autostart', False):
            self.write_metric('univention_s4_connector', 0)
            self.log.debug('Connector not activated (connector/s4/autostart =! true)')
            return

        # check whether we can connect to the S4
        # CRITICAL: in case we cannot connect to the S4
        rc = self.exec_command(['univention-s4search', 'cn=users', 'cn=users'], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)[0]
        self.write_metric('univention_s4_connector_samba_reachable', 1 if rc == 0 else 0)

        # check whether the s4 connector is running; for this
        # WARNING: if more than one instance of the same connector is running
        # CRITICAL: if no process is running
        rc, output = self.exec_command(['/usr/lib/nagios/plugins/check_procs', '-w', ':1', '-c', '1:', '--ereg-argument-array', '^([^ ]+)?python.*s4connector.s4.main(.py)?$'], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
        output = {1: 'More than one s4 connector instance are running!', 2: 's4 connector is not running!'}.get(rc, 'Unknown state!')
        self.log.debug(output)
        self.write_metric('univention_s4_connector_running', rc if rc in (0, 1, 2) else -1)

        # count rejects by parsing the output of univention-s4connector-list-rejected
        # WARNING: if there are any rejects
        rc, output = self.exec_command(['univention-s4connector-list-rejected'])
        rejects = sum(1 for line in output.splitlines() if RE_REJECT.match(line))

        self.write_metric('univention_s4_connector_rejects', rejects)
        if rejects:
            self.log.debug('Found %d reject(s)! Please check output of univention-s4connector-list-rejected.' % (rejects,))


if __name__ == '__main__':
    S4Connector.main()
