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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* Standard log reader/writer.
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*
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* @package logstore_standard
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* @copyright 2014 Petr Skoda {@link http://skodak.org}
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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namespace logstore_standard\task;
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defined('MOODLE_INTERNAL') || die();
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class cleanup_task extends \core\task\scheduled_task {
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/**
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* Get a descriptive name for this task (shown to admins).
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*
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* @return string
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*/
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public function get_name() {
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return get_string('taskcleanup', 'logstore_standard');
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}
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/**
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* Do the job.
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* Throw exceptions on errors (the job will be retried).
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*/
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public function execute() {
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global $DB;
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$loglifetime = (int)get_config('logstore_standard', 'loglifetime');
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if (empty($loglifetime) || $loglifetime < 0) {
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return;
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}
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$loglifetime = time() - ($loglifetime * 3600 * 24); // Value in days.
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$lifetimep = array($loglifetime);
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$start = time();
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while ($min = $DB->get_field_select("logstore_standard_log", "MIN(timecreated)", "timecreated < ?", $lifetimep)) {
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// Break this down into chunks to avoid transaction for too long and generally thrashing database.
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// Experiments suggest deleting one day takes up to a few seconds; probably a reasonable chunk size usually.
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// If the cleanup has just been enabled, it might take e.g a month to clean the years of logs.
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$params = array(min($min + 3600 * 24, $loglifetime));
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$DB->delete_records_select("logstore_standard_log", "timecreated < ?", $params);
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if (time() > $start + 300) {
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// Do not churn on log deletion for too long each run.
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break;
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}
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}
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mtrace(" Deleted old log records from standard store.");
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}
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}
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