. /** jsupdated.php - notes by Martin Langhoff ** ** This is an alternative version of jsupdate.php that acts ** as a long-running daemon. It will feed/stall/feed JS updates ** to the client. From the module configuration select "Stream" ** updates. ** ** The client connection is not forever though. Once we reach ** CHAT_MAX_CLIENT_UPDATES, it will force the client to re-fetch it. ** ** This buys us all the benefits that chatd has, minus the setup, ** as we are using apache to do the daemon handling. ** **/ define('CHAT_MAX_CLIENT_UPDATES', 1000); define('NO_MOODLE_COOKIES', true); // Session not used here. define('NO_OUTPUT_BUFFERING', true); require('../../../config.php'); require('../lib.php'); // We are going to run for a long time. // Avoid being terminated by php. core_php_time_limit::raise(); $chatsid = required_param('chat_sid', PARAM_ALPHANUM); $chatlasttime = optional_param('chat_lasttime', 0, PARAM_INT); $chatlastrow = optional_param('chat_lastrow', 1, PARAM_INT); $chatlastid = optional_param('chat_lastid', 0, PARAM_INT); $url = new moodle_url('/mod/chat/gui_header_js/jsupdated.php', array('chat_sid' => $chatsid)); if ($chatlasttime !== 0) { $url->param('chat_lasttime', $chatlasttime); } if ($chatlastrow !== 1) { $url->param('chat_lastrow', $chatlastrow); } if ($chatlastid !== 1) { $url->param('chat_lastid', $chatlastid); } $PAGE->set_url($url); if (!$chatuser = $DB->get_record('chat_users', array('sid' => $chatsid))) { print_error('notlogged', 'chat'); } // Get the minimal course. if (!$course = $DB->get_record('course', array('id' => $chatuser->course))) { print_error('invalidcourseid'); } // Get the user theme and enough info to be used in chat_format_message() which passes it along to // chat_format_message_manually() -- and only id and timezone are used. // No optimisation here, it would break again in future! if (!$user = $DB->get_record('user', array('id' => $chatuser->userid, 'deleted' => 0, 'suspended' => 0))) { print_error('invaliduser'); } \core\session\manager::set_user($user); // Setup course, lang and theme. $PAGE->set_course($course); // Force deleting of timed out users if there is a silence in room or just entering. if ((time() - $chatlasttime) > $CFG->chat_old_ping) { // Must be done before chat_get_latest_message! chat_delete_old_users(); } // Time to send headers, and lay out the basic JS updater page. header('Expires: Sun, 28 Dec 1997 09:32:45 GMT'); header('Last-Modified: '.gmdate('D, d M Y H:i:s').' GMT'); header('Cache-Control: no-cache, must-revalidate'); header('Pragma: no-cache'); header('Content-Type: text/html; charset=utf-8'); $refreshurl = "{$CFG->wwwroot}/mod/chat/gui_header_js/jsupdated.php?". "chat_sid=$chatsid&chat_lasttime=$chatlasttime&chat_lastrow=$chatnewrow&chat_lastid=$chatlastid"; ?> lastping = time(); $DB->set_field('chat_users', 'lastping', $chatuser->lastping, array('id' => $chatuser->id)); if ($message = chat_get_latest_message($chatuser->chatid, $chatuser->groupid)) { $chatnewlasttime = $message->timestamp; $chatnewlastid = $message->id; } else { $chatnewlasttime = 0; $chatnewlastid = 0; print " \n"; print $CHAT_DUMMY_DATA; sleep($CFG->chat_refresh_room); continue; } $timenow = time(); $params = array('groupid' => $chatuser->groupid, 'lastid' => $chatlastid, 'lasttime' => $chatlasttime, 'chatid' => $chatuser->chatid); $groupselect = $chatuser->groupid ? " AND (groupid=:groupid OR groupid=0) " : ""; $newcriteria = ''; if ($chatlastid > 0) { $newcriteria = "id > :lastid"; } else { if ($chatlasttime == 0) { // Display some previous messages. $chatlasttime = $timenow - $CFG->chat_old_ping; // TO DO - any better value? } $newcriteria = "timestamp > :lasttime"; } $messages = $DB->get_records_select("chat_messages_current", "chatid = :chatid AND $newcriteria $groupselect", $params, "timestamp ASC"); if ($messages) { $num = count($messages); } else { print " \n"; print $CHAT_DUMMY_DATA; sleep($CFG->chat_refresh_room); continue; } print '' . "\n\n"; if ($beep) { print ''; } print $CHAT_DUMMY_DATA; sleep($CFG->chat_refresh_room); } // Here ends the for() loop. // Here & should be written & :-D. $refreshurl = "{$CFG->wwwroot}/mod/chat/gui_header_js/jsupdated.php?"; $refreshurl .= "chat_sid=$chatsid&chat_lasttime=$chatlasttime&chat_lastrow=$chatnewrow&chat_lastid=$chatlastid"; print '' . "\n\n"; ?>