Can't send a message with the new websocket protocol - php

Question

I am trying to develop a websocket server in php.
Here is what I have done so far :
(server part)
$server = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
socket_set_option($server, SOL_SOCKET, SO_REUSEADDR, 1);
socket_bind($server, "localhost", 10000);
socket_listen($server);
$client = socket_accept($server);
$message = socket_read($client, 5000);
$matches = array();
preg_match('#Sec-WebSocket-Key: (.*)\r\n#', $message, $matches);
$new_key = new_key($matches[1]);
$new_message = "HTTP/1.1 101 Switching Protocols\r\n";
$new_message .= "Upgrade: websocket\r\n";
$new_message .= "Connection: Upgrade\r\n";
$new_message .= "Sec-WebSocket-Accept: " . $new_key . "\r\n\r\n";
socket_write($client, $new_message, strlen($new_message));
$new_message = "Test message !";
socket_write($client, $new_message, strlen($new_message));
function new_key($key)
{
$key .= "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
$key = sha1($key);
$new_key = '';
for ($i = 0; $i < strlen($key); $i+=2)
{
$new_key .= chr(intval($key[$i] . $key[$i+1], 16));
}
$new_key = base64_encode($new_key);
return $new_key;
}
/* End of file server.php */
(client part)
window.onload = function() {
var ws = new WebSocket('ws://localhost:10000');
ws.onopen = function() {
alert('Connection open !');
setInterval(function() {
ws.send('lol');
}, 1000);
}
ws.onclose = function() {
alert('WebSocket close !');
}
ws.onmessage = function(e) {
alert(e.data);
}
ws.onerror = function(e) {
alert('Error');
}
};
The first socket_write works perfectly (for the handshake) and the open event is triggered correctly. But the second socket_write doesn't work. I tried to do a ws.send on the open event with a second socket_read in server part, it doesn't work neither.
Thank you if you have an idea !

Answer 1

I think it is a INVALID_STATE_ERR: DOM Exception 11 meaning a sync problem. Try this in your client:
var test = function(){
var myWebSocket = new WebSocket('ws://localhost:10000');
myWebSocket.onopen = function(e){
alert('connection open');
this.send('test1');
this.send('test2');
}
myWebSocket.onmessage = function(e){ alert('message ' + e.data) };
myWebSocket.onclose = function(e){ alert('connection closed'); this.close(); };
myWebSocket.send('test3');
};
test3 will fail because it is an asynchronous websocket.

Answer 2

I had a similar issue. After checking out this project over here https://github.com/srchea/PHP-Push-WebSocket I noticed a function called "encode" in this file https://github.com/srchea/PHP-Push-WebSocket/blob/master/lib/Server.class.php before sending the message.
So try to change this
socket_write($client, $new_message, strlen($new_message));
$new_message = "Test message !";
socket_write($client, $new_message, strlen($new_message));
to this
socket_write($client, $new_message, strlen($new_message));
$new_message = "Test message !";
socket_write($client, chr(129) . chr(strlen($new_message)) ."". $new_message);