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<?php
/**
* Elgg log rotator.
*
* @package ElggLogRotate
*/
elgg_register_event_handler('init', 'system', 'logrotate_init');
function logrotate_init() {
$period = elgg_get_plugin_setting('period', 'logrotate');
$delete = elgg_get_plugin_setting('delete', 'logrotate');
switch ($period) {
case 'weekly':
case 'monthly' :
case 'yearly' :
break;
default:
$period = 'monthly';
}
// Register cron hook for archival of logs
elgg_register_plugin_hook_handler('cron', $period, 'logrotate_archive_cron');
// Register cron hook for deletion of selected archived logs
elgg_register_plugin_hook_handler('cron', $delete, 'logrotate_delete_cron');
}
/**
* Trigger the log rotation.
*/
function logrotate_archive_cron($hook, $entity_type, $returnvalue, $params) {
$resulttext = elgg_echo("logrotate:logrotated");
$day = 86400;
$offset = 0;
$period = elgg_get_plugin_setting('period', 'logrotate');
switch ($period) {
case 'weekly':
$offset = $day * 7;
break;
case 'yearly':
$offset = $day * 365;
break;
case 'monthly':
default:
// assume 28 days even if a month is longer. Won't cause data loss.
$offset = $day * 28;
}
if (!archive_log($offset)) {
$resulttext = elgg_echo("logrotate:lognotrotated");
}
return $returnvalue . $resulttext;
}
/**
* Trigger the log deletion.
*/
function logrotate_delete_cron($hook, $entity_type, $returnvalue, $params) {
$resulttext = elgg_echo("logrotate:logdeleted");
$day = 86400;
$offset = 0;
$period = elgg_get_plugin_setting('delete', 'logrotate');
switch ($period) {
case 'weekly':
$offset = $day * 7;
break;
case 'yearly':
$offset = $day * 365;
break;
case 'monthly':
default:
// assume 28 days even if a month is longer. Won't cause data loss.
$offset = $day * 28;
}
if (!log_browser_delete_log($offset)) {
$resulttext = elgg_echo("logrotate:lognotdeleted");
}
return $returnvalue . $resulttext;
}
/**
* This function deletes archived copies of the system logs that are older than specified.
*
* @param int $time_of_delete An offset in seconds from now to delete (useful for log deletion)
*/
function log_browser_delete_log($time_of_delete) {
global $CONFIG;
$offset = (int)$time_of_delete;
$now = time();
$ts = $now - $offset;
$FLAG = 1;
$result = mysql_query("SHOW TABLES like '{$CONFIG->dbprefix}system_log_%'");
while ($showtablerow = mysql_fetch_array($result)) {
//To obtain time of archival
$log_time = explode("{$CONFIG->dbprefix}system_log_", $showtablerow[0]);
if ($log_time < $ts) {
//If the time of archival is before the required offset then delete
if (!mysql_query("DROP TABLE $showtablerow[0]")) {
$FLAG = 0;
}
}
}
//Check if the appropriate tables have been deleted and return true if yes
if ($FLAG) {
return true;
} else {
return false;
}
}
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