**
** 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
@set_time_limit(0);
$chat_sid = required_param('chat_sid', PARAM_ALPHANUM);
$chat_lasttime = optional_param('chat_lasttime', 0, PARAM_INT);
$chat_lastrow = optional_param('chat_lastrow', 1, PARAM_INT);
$chat_lastid = optional_param('chat_lastid', 0, PARAM_INT);
$url = new moodle_url('/mod/chat/gui_header_js/jsupdated.php', array('chat_sid'=>$chat_sid));
if ($chat_lasttime !== 0) {
$url->param('chat_lasttime', $chat_lasttime);
}
if ($chat_lastrow !== 1) {
$url->param('chat_lastrow', $chat_lastrow);
}
if ($chat_lastid !== 1) {
$url->param('chat_lastid', $chat_lastid);
}
$PAGE->set_url($url);
if (!$chatuser = $DB->get_record('chat_users', array('sid'=>$chat_sid))) {
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.
if (!$USER = $DB->get_record('user', array('id'=>$chatuser->userid))) { // no optimisation here, it would break again in future!
print_error('invaliduser');
}
$USER->description = '';
//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() - $chat_lasttime) > $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');
/// required stylesheets
$stylesheetshtml = '';
/*foreach ($CFG->stylesheets as $stylesheet) {
//TODO: MDL-21120
$stylesheetshtml .= '';
}*/
$refreshurl = "{$CFG->wwwroot}/mod/chat/gui_header_js/jsupdated.php?chat_sid=$chat_sid&chat_lasttime=$chat_lasttime&chat_lastrow=$chat_newrow&chat_lastid=$chat_lastid";
?>
lastping = time();
$DB->set_field('chat_users', 'lastping', $chatuser->lastping, array('id'=>$chatuser->id));
if ($message = chat_get_latest_message($chatuser->chatid, $chatuser->groupid)) {
$chat_newlasttime = $message->timestamp;
$chat_newlastid = $message->id;
} else {
$chat_newlasttime = 0;
$chat_newlastid = 0;
print " \n";
print $CHAT_DUMMY_DATA;
sleep($CFG->chat_refresh_room);
continue;
}
$timenow = time();
$params = array('groupid'=>$chatuser->groupid, 'lastid'=>$chat_lastid, 'lasttime'=>$chat_lasttime, 'chatid'=>$chatuser->chatid);
$groupselect = $chatuser->groupid ? " AND (groupid=:groupid OR groupid=0) " : "";
$newcriteria = '';
if ($chat_lastid > 0) {
$newcriteria = "id > :lastid";
} else {
if ($chat_lasttime == 0) { //display some previous messages
$chat_lasttime = $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;
$num = 0;
}
print '' . "\n\n";
if ($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?chat_sid=$chat_sid&chat_lasttime=$chat_lasttime&chat_lastrow=$chat_newrow&chat_lastid=$chat_lastid";
print '' . "\n\n";
?>