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   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   * A scheduled task for chat cron.
  19   *
  20   * @package    mod_chat
  21   * @copyright  2019 Simey Lameze <simey@moodle.com>
  22   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23   */
  24  namespace mod_chat\task;
  25  
  26  defined('MOODLE_INTERNAL') || die();
  27  
  28  /**
  29   * The main schedule task for the chat module.
  30   *
  31   * @package   mod_chat
  32   * @copyright 2019 Simey Lameze <simey@moodle.com>
  33   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  34   */
  35  class cron_task extends \core\task\scheduled_task {
  36  
  37      /**
  38       * Get a descriptive name for this task (shown to admins).
  39       *
  40       * @return string
  41       */
  42      public function get_name() {
  43          return get_string('crontask', 'mod_chat');
  44      }
  45  
  46      /**
  47       * Run chat cron.
  48       */
  49      public function execute() {
  50          global $CFG, $DB;
  51          require_once($CFG->dirroot . '/mod/chat/lib.php');
  52  
  53          chat_update_chat_times();
  54          chat_delete_old_users();
  55  
  56          $timenow = time();
  57          $subselect = "SELECT c.keepdays
  58                          FROM {chat} c
  59                         WHERE c.id = {chat_messages}.chatid";
  60          $DB->delete_records_select('chat_messages', "($subselect) > 0 AND timestamp < (? - ($subselect) * ?)",
  61                  [$timenow, DAYSECS]);
  62  
  63          $DB->delete_records_select('chat_messages_current', "timestamp < ?", [$timenow - 8 * HOURSECS]);
  64      }
  65  }