Save data using websocket communication - php

Question

Im creating "communication" with websockets. (thanks: http://www.sanwebe.com/2013/05/chat-using-websocket-php-socket), the communication works very well, but Im trying to save some date when it goes through the "websocket server"(?)
I have created the socket ws_server.php
<?php
require_once('filegenerator.php');
$filegenerator = new FileGenerator();
$host = '127.0.0.1'; //host
$port = '9000'; //port
$null = NULL; //null var
//Create TCP/IP sream socket
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
//reuseable port
socket_set_option($socket, SOL_SOCKET, SO_REUSEADDR, 1);
//bind socket to specified host
socket_bind($socket, 0, $port);
//listen to port
socket_listen($socket);
//create & add listning socket to the list
$clients = array($socket);
//start endless loop, so that our script doesn't stop
while (true) {
//manage multipal connections
$changed = $clients;
//returns the socket resources in $changed array
socket_select($changed, $null, $null, 0, 10);
//check for new socket
if (in_array($socket, $changed)) {
$socket_new = socket_accept($socket); //accpet new socket
$clients[] = $socket_new; //add socket to client array
$header = socket_read($socket_new, 1024); //read data sent by the socket
perform_handshaking($header, $socket_new, $host, $port); //perform websocket handshake
socket_getpeername($socket_new, $ip); //get ip address of connected socket
$response = mask(json_encode(array('type'=>'system', 'message'=>$ip.' connected'))); //prepare json data
send_message($response); //notify all users about new connection
//make room for new socket
$found_socket = array_search($socket, $changed);
unset($changed[$found_socket]);
}
//loop through all connected sockets
foreach ($changed as $changed_socket) {
//check for any incomming data
while(socket_recv($changed_socket, $buf, 1024, 0) >= 1)
{
$received_text = unmask($buf); //unmask data
$tst_msg = json_decode($received_text); //json decode
if ($tst_msg->type == 'order') {
filegen( 'String for testing',$filegenerator );
$items_to_kitchen = $tst_msg->order->items;
foreach ($items_to_kitchen as $key => $value) {
$msg_to_kitchen[$key] = $value;
}
$response_text = mask(json_encode(array('order'=>$msg_to_kitchen)));
} elseif ($tst_msg->type == 'kitchen') {
$response_text = mask(json_encode(array('type'=>$tst_msg->type,'kitchenstate'=>$tst_msg)));
}
send_message($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 $clients array
$found_socket = array_search($changed_socket, $clients);
socket_getpeername($changed_socket, $ip);
unset($clients[$found_socket]);
//notify all users about disconnected connection
$response = mask(json_encode(array('type'=>'system', 'message'=>$ip.' disconnected')));
send_message($response);
}
}
}
// close the listening socket
socket_close($sock);
function send_message($msg)
{
global $clients;
foreach($clients as $changed_socket)
{
#socket_write($changed_socket,$msg,strlen($msg));
}
return true;
}
//Unmask incoming framed message
function unmask($text) {
$length = ord($text[1]) & 127;
if($length == 126) {
$masks = substr($text, 4, 4);
$data = substr($text, 8);
}
elseif($length == 127) {
$masks = substr($text, 10, 4);
$data = substr($text, 14);
}
else {
$masks = substr($text, 2, 4);
$data = substr($text, 6);
}
$text = "";
for ($i = 0; $i < strlen($data); ++$i) {
$text .= $data[$i] ^ $masks[$i%4];
}
return $text;
}
//Encode message for transfer to client.
function mask($text)
{
$b1 = 0x80 | (0x1 & 0x0f);
$length = strlen($text);
if($length <= 125)
$header = pack('CC', $b1, $length);
elseif($length > 125 && $length < 65536)
$header = pack('CCn', $b1, 126, $length);
elseif($length >= 65536)
$header = pack('CCNN', $b1, 127, $length);
return $header.$text;
}
//handshake new client.
function perform_handshaking($receved_header,$client_conn, $host, $port)
{
$headers = array();
$lines = preg_split("/\r\n/", $receved_header);
foreach($lines as $line)
{
$line = chop($line);
if(preg_match('/\A(\S+): (.*)\z/', $line, $matches))
{
$headers[$matches[1]] = $matches[2];
}
}
$secKey = $headers['Sec-WebSocket-Key'];
$secAccept = base64_encode(pack('H*', sha1($secKey . '258EAFA5-E914-47DA-95CA-C5AB0DC85B11')));
//hand shaking header
$upgrade = "HTTP/1.1 101 Web Socket Protocol Handshake\r\n" .
"Upgrade: websocket\r\n" .
"Connection: Upgrade\r\n" .
"WebSocket-Origin: $host\r\n" .
"WebSocket-Location: ws://$host:$port/xxx/includes/ws_server.php\r\n".
"Sec-WebSocket-Accept:$secAccept\r\n\r\n";
socket_write($client_conn,$upgrade,strlen($upgrade));
}
The client sends the data with $tst_msg->type == 'order' .. then I wants to create json file to save it. The class of file generation is in filegenerator.php
<?php
class FileGenerator{
private $_filename;
private $_data;
public function write($str_filename,$str_data){
$this->_filename = $str_filename;
$this->_data = $str_data;
$this->_checkPermission();
$this->_checkData();
$handle = fopen($str_filename,'w');
fwrite($handle, $str_data."\r\n");
fclose($handle);
}
public function test(){
echo "This string outputs in console";
// php -q ws_server.php
}
public function read($str_filename){
$this->_filename = $str_filename;
echo $this->_filename;
$this->_checkExists();
$handle = fopen($str_filename, 'r');
return file_get_contents($str_filename);
}
private function _checkPermission(){
if ( !is_writable($this->_filename)) {
die('Change your CHMOD permissions to:'.$this->_filename);
}
}
private function _checkData(){
if (strlen($this->_data) < 1) {
die('You must have more than one character for data');
}
}
private function _checkExists(){
if (!file_exists($this->_filename)) {
die('The File does not exis');
}
}
}
function filegen( $str,$filegenerator ){
$filegenerator->test();
$filegenerator->write('test.json',$str);
}
?>
When I call the function filegen() at line 58 in ws_server.php ,
filegen( 'String for testing',$filegenerator );
at the permission check the program die(). But
The file is writable, full access (for testing purposes)
It exists
Interesting thin, when I create another file for testing the FileGenerator class it works perfectly, but doesnt from ws_server.php file
Im using xampp on windows
The console run: php -q D:\xampp\htdocs\xxx\includes\ws_server.php
I tried simply put
$handle = fopen($str_filename,'w');
fwrite($handle, $str_data."\r\n");
fclose($handle);
but same issue occurs. Interesting thing, that I can get $handle #id if I echo, and echoing fwrite() can return the the number of characters, but the file doesnt change!
Can somebody help me, describe me what am I doing wrong! Thank you

Answer 1

I think it's a path problem or a file ownership problem.
Try $filegenerator->write(__DIR__ . '/test.json, $str) to make sure it tries to write test.json in the directory the file is in.
Check who the file owner on the filesystem is. Webservers often have their own user (www-data for example), which might conflict with your own logged in user. You might have to chown the file.