/**
* Finds the Document model based on its primary key value.
* If the model is not found, a 404 HTTP exception will be thrown.
* @param integer $id
* @return Document the loaded model
* @throws NotFoundHttpException if the model cannot be found
*/
protected function findModel($id)
{
if (($model = Document::findOne($id)) !== null) {
return $model;
} else {
throw new NotFoundHttpException('The requested page does not exist.');
}
}
public function listen()
{
try {
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
//Create TCP/IP sream socket
socket_set_option($socket, SOL_SOCKET, SO_REUSEADDR, 1);
//reuseable port
socket_bind($socket, 0, $this->getPort());
//bind socket to specified host
socket_listen($socket);
//listen to port
$this->clients = array($socket);
//create & add listning socket to the list
//start endless loop, so that our script doesn't stop
while (true) {
$changed = $this->clients;
//manage multipal connections
socket_select($changed, $null, $null, 0, 10);
//returns the socket resources in $changed array
//check for new socket
if (in_array($socket, $changed)) {
$socket_new = socket_accept($socket);
//accpet new socket
$this->clients[] = $socket_new;
//add socket to client array
$header = socket_read($socket_new, 1024);
//read data sent by the socket
$this->performHandshaking($header, $socket_new, $this->getHost(), $this->getPort());
//perform websocket handshake
socket_getpeername($socket_new, $ip);
//get ip address of connected socket
$response = $this->mask(json_encode(array('type' => 'system', 'message' => $ip . ' connected')));
//prepare json data
$this->sendMessage($response);
//notify all users about new connection
$found_socket = array_search($socket, $changed);
//make room for new socket
unset($changed[$found_socket]);
}
//loop through all connected sockets
foreach ($changed as $changed_socket) {
// check for any incomming data
while (socket_recv($changed_socket, $buf, 8192000, 0) >= 1) {
$received_text = $this->unmask($buf);
//unmask data
$tst_msg = json_decode($received_text);
//json decode
$diff = $tst_msg->diff;
//document diff
$auth_key = $tst_msg->auth_key;
//user auth key
$document_id = $tst_msg->document_id;
//document id
if (!Yii::$app->db->getIsActive()) {
Yii::$app->db->open();
}
$user = User::findIdentityByAuthKey($auth_key);
if ($user === NULL) {
$response_text = $this->mask(json_encode(array('type' => 'system', 'message' => "You don't have permission to access")));
$this->sendMessage($response_text);
//send data
break 2;
}
$document = Document::findOne(['id' => intval($document_id)]);
if ($document === NULL) {
$response_text = $this->mask(json_encode(array('type' => 'system', 'message' => "The requested document does not exist.")));
$this->sendMessage($response_text);
//send data
break 2;
}
$this->saveDocument($document, $diff);
//prepare data to be sent to client
$response_text = $this->mask(json_encode(array('type' => 'update', 'document_diff' => $diff)));
var_dump($this->sendMessage($response_text));
//send data
break 2;
//exist this loop
}
$buf = @socket_read($changed_socket, 1024, PHP_NORMAL_READ);
if ($buf === false) {
// check disconnected client
// remove client for $this->clients array
$found_socket = array_search($changed_socket, $this->clients);
@socket_getpeername($changed_socket, $ip);
unset($this->clients[$found_socket]);
//notify all users about disconnected connection
$response = $this->mask(json_encode(array('type' => 'system', 'message' => $ip . ' disconnected')));
$this->sendMessage($response);
}
}
}
} catch (\yii\base\Exception $e) {
} finally {
// close the listening socket
socket_close($socket);
}
}
