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<?php
/*
** Copyright (C) 2001-2025 Zabbix SIA
**
** This program is free software: you can redistribute it and/or modify it under the terms of
** the GNU Affero General Public License as published by the Free Software Foundation, version 3.
**
** This program is distributed 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 along with this program.
** If not, see <https://www.gnu.org/licenses/>.
**/
/**
* Class to perform low level trigger related actions.
*/
class CTriggerManager {
/**
* Deletes triggers and related entities without permission check.
*
* @param array $triggerids
*/
public static function delete(array $triggerids) {
$del_triggerids = [];
// Selecting all inherited triggers.
$parent_triggerids = array_flip($triggerids);
do {
$db_triggers = DBselect(
'SELECT t.triggerid'.
' FROM triggers t'.
' WHERE '.dbConditionInt('t.templateid', array_keys($parent_triggerids))
);
$del_triggerids += $parent_triggerids;
$parent_triggerids = [];
while ($db_trigger = DBfetch($db_triggers)) {
if (!array_key_exists($db_trigger['triggerid'], $del_triggerids)) {
$parent_triggerids[$db_trigger['triggerid']] = true;
}
}
} while ($parent_triggerids);
$del_triggerids = array_keys($del_triggerids);
self::checkUsedInActions($del_triggerids);
// Remove trigger sysmap elements.
$selement_triggerids = [];
$selementids = [];
$db_selement_triggers = DBselect(
'SELECT st.selement_triggerid,st.selementid'.
' FROM sysmap_element_trigger st'.
' WHERE '.dbConditionInt('st.triggerid', $del_triggerids)
);
while ($db_selement_trigger = DBfetch($db_selement_triggers)) {
$selement_triggerids[] = $db_selement_trigger['selement_triggerid'];
$selementids[$db_selement_trigger['selementid']] = true;
}
if ($selement_triggerids) {
DB::delete('sysmap_element_trigger', ['selement_triggerid' => $selement_triggerids]);
// Remove map elements without triggers.
$db_selement_triggers = DBselect(
'SELECT DISTINCT st.selementid'.
' FROM sysmap_element_trigger st'.
' WHERE '.dbConditionInt('st.selementid', array_keys($selementids))
);
while ($db_selement_trigger = DBfetch($db_selement_triggers)) {
unset($selementids[$db_selement_trigger['selementid']]);
}
if ($selementids) {
DB::delete('sysmaps_elements', ['selementid' => array_keys($selementids)]);
}
}
// Remove related events.
$ins_housekeeper = [];
foreach ($del_triggerids as $del_triggerid) {
$ins_housekeeper[] = [
'tablename' => 'events',
'field' => 'triggerid',
'value' => $del_triggerid
];
}
DB::insertBatch('housekeeper', $ins_housekeeper);
DB::delete('functions', ['triggerid' => $del_triggerids]);
DB::delete('trigger_discovery', ['triggerid' => $del_triggerids]);
DB::delete('trigger_depends', ['triggerid_down' => $del_triggerids]);
DB::delete('trigger_depends', ['triggerid_up' => $del_triggerids]);
DB::delete('trigger_tag', ['triggerid' => $del_triggerids]);
DB::update('triggers', [
'values' => ['templateid' => 0],
'where' => ['triggerid' => $del_triggerids]
]);
DB::delete('triggers', ['triggerid' => $del_triggerids]);
}
/**
* @throws APIException
*/
private static function checkUsedInActions(array $del_triggerids): void {
$row = DBfetch(DBselect(
'SELECT a.name,t.description'.
' FROM conditions c'.
' JOIN actions a ON c.actionid=a.actionid'.
' JOIN triggers t ON '.zbx_dbcast_2bigint('c.value').'=t.triggerid'.
' WHERE c.conditiontype='.ZBX_CONDITION_TYPE_TRIGGER.
' AND '.dbConditionString('c.value', $del_triggerids),
1
));
if ($row) {
throw new APIException(ZBX_API_ERROR_PARAMETERS, _s('Cannot delete trigger "%1$s": %2$s.',
$row['description'], _s('action "%1$s" uses this trigger', $row['name'])
));
}
}
}
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