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<?php
/**
* Elgg system log.
* Listens to events and writes crud events into the system log database.
*
* @package Elgg
* @subpackage Core
* @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU Public License version 2
* @author Marcus Povey
* @copyright Curverider Ltd 2008
* @link http://elgg.org/
*/
/**
* Interface that provides an interface which must be implemented by all objects wishing to be
* recorded in the system log (and by extension the river).
* @author Marcus Povey
*/
interface Loggable
{
/**
* Return an identification for the object for storage in the system log.
* This id must be an integer.
*
* @return int
*/
public function getSystemLogID();
/**
* Return the class name of the object. Added as a function because get_class causes errors for some reason.
*/
public function getClassName();
}
/**
* Log a system event related to a specific object.
*
* @param $object The object you're talking about.
* @param $event String The event being logged
*/
function system_log($object, $event)
{
global $CONFIG;
if ($object instanceof Loggable)
{
// Has loggable interface, extract the necessary information and store
$object_id = (int)$object->getSystemLogID();
$object_class = $object->getClassName();
$event = sanitise_string($event);
$time = time();
// Create log
return insert_data("INSERT into {$CONFIG->dbprefix}system_log (object_id, object_class, event, time_created) VALUES ('$object_id','$object_class','$event','$time')");
}
}
/**
* System log listener.
* This function listens to all events in the system and logs anything appropriate.
*
* @param String $event
* @param String $object_type
* @param mixed $object
*/
function system_log_listener($event, $object_type, $object)
{
system_log($object, $event);
return true;
}
/** Register event to listen to all events **/
register_event_handler('all','all','system_log_listener');
?>
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