# iterate through the requests and create responses
$responses = array();
foreach ($requests->requests as $request) {
try {
# all responses need id of the request and client instance
$response = (object) array('id' => $request->id);
if (isset($request->instanceId)) {
$response->instanceId = $request->instanceId;
}
# verify session where applicable
switch ($request->function) {
case 'message':
case 'sysmessage':
case 'refresh':
case 'last_read':
if (!($session2user = helpmenow_get_s2u($request->session))) {
throw new Exception('Could not get session2user record');
}
#echo "verrified session2user: "******"\n"; # DEBUGGING
break;
}
# generate response
switch ($request->function) {
case 'message':
case 'sysmessage':
case 'refresh':
case 'block':
case 'motd':
case 'plugin':
case 'last_read':
$function = 'helpmenow_serverfunc_' . $request->function;
/**
* chat refresh
*
* @param object $request request from client
* @param object $response response
*/
function helpmenow_serverfunc_refresh($request, &$response)
{
global $USER, $CFG, $DB;
$session2user = helpmenow_get_s2u($request->session);
# unless something has gone wrong, we should already have a response ready:
if ($request->last_message == $session2user->optimistic_last_message) {
$response_cache = json_decode($session2user->cache);
$response = (object) array_merge((array) $response, (array) $response_cache);
} else {
# unread messages
$messages = helpmenow_get_unread($request->session, $USER->id);
# todo: move this to the client
if ($messages) {
if (!isset($response->html)) {
$response->html = '';
}
$response->html .= helpmenow_format_messages($messages);
# determine if we need to beep
foreach ($messages as $m) {
if ($m->notify) {
$response->title_flash = format_string($m->message);
$response->beep = true;
}
$response->last_message = $m->id;
}
} else {
$response->last_message = $request->last_message;
}
}
if (!isset($response->last_message)) {
$response->last_message = null;
}
/**
* if there aren't any new messages check to see if we should add a "sent: _time_" message
*
* yes, it sucks, it's one of the many things todo: move to client
* -dzaharee
*/
if ($response->last_message == $request->last_message) {
$sql = "\n SELECT *\n FROM {block_helpmenow_message}\n WHERE id = (\n SELECT max(id)\n FROM {block_helpmenow_message}\n WHERE sessionid = {$request->session}\n )";
if ($last_message = $DB->get_record_sql($sql)) {
if (!is_null($last_message->userid) and $last_message->time < time() - 30) {
$message = get_string('sent', 'block_helpmenow') . ': ' . userdate($last_message->time, '%r');
helpmenow_message($request->session, null, $message, 0);
}
}
}
# update session2user
$session2user->last_message = $request->last_message;
$session2user->optimistic_last_message = $response->last_message;
$session2user->last_refresh = time();
$session2user->cache = json_encode((object) array('html' => '', 'beep' => false, 'last_message' => $request->last_message));
if (!$DB->update_record('block_helpmenow_session2user', $session2user)) {
$response->html = '';
$response->beep = false;
$response->last_message = $request->last_message;
throw new Exception('Could not update session2user record');
}
# call subplugin on_chat_refresh methods
foreach (helpmenow_plugin::get_plugins() as $pluginname) {
$class = "helpmenow_plugin_{$pluginname}";
$class::on_chat_refresh($request, $response);
}
}