source: moodle/trunk/fuentes/admin/tool/log/store/legacy/classes/task/cleanup_task.php @ 1331

Last change on this file since 1331 was 1331, checked in by jrpelegrina, 3 years ago

Updated to moodle 3.0.3

File size: 2.3 KB
Line 
1<?php
2// This file is part of Moodle - http://moodle.org/
3//
4// Moodle is free software: you can redistribute it and/or modify
5// it under the terms of the GNU General Public License as published by
6// the Free Software Foundation, either version 3 of the License, or
7// (at your option) any later version.
8//
9// Moodle is distributed in the hope that it will be useful,
10// but WITHOUT ANY WARRANTY; without even the implied warranty of
11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12// GNU General Public License for more details.
13//
14// You should have received a copy of the GNU General Public License
15// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
16
17/**
18 * Legacy log reader.
19 *
20 * @package    logstore_legacy
21 * @copyright  2014 Petr Skoda {@link http://skodak.org}
22 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
23 */
24
25namespace logstore_legacy\task;
26
27defined('MOODLE_INTERNAL') || die();
28
29class cleanup_task extends \core\task\scheduled_task {
30
31    /**
32     * Get a descriptive name for this task (shown to admins).
33     *
34     * @return string
35     */
36    public function get_name() {
37        return get_string('taskcleanup', 'logstore_legacy');
38    }
39
40    /**
41     * Do the job.
42     * Throw exceptions on errors (the job will be retried).
43     */
44    public function execute() {
45        global $CFG, $DB;
46
47        if (empty($CFG->loglifetime)) {
48            return;
49        }
50
51        $loglifetime = time() - ($CFG->loglifetime * 3600 * 24); // Value in days.
52        $lifetimep = array($loglifetime);
53        $start = time();
54
55        while ($min = $DB->get_field_select("log", "MIN(time)", "time < ?", $lifetimep)) {
56            // Break this down into chunks to avoid transaction for too long and generally thrashing database.
57            // Experiments suggest deleting one day takes up to a few seconds; probably a reasonable chunk size usually.
58            // If the cleanup has just been enabled, it might take e.g a month to clean the years of logs.
59            $params = array(min($min + 3600 * 24, $loglifetime));
60            $DB->delete_records_select("log", "time < ?", $params);
61            if (time() > $start + 300) {
62                // Do not churn on log deletion for too long each run.
63                break;
64            }
65        }
66
67        mtrace(" Deleted old legacy log records");
68    }
69}
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