CODEWITHSUNDEEP
phpjavascriptwebsocket
marverix
marverix

Reputation: 7705

Websocket - client doesn't receive data

I'm writing some app based on websockets (RFC 6455). Unfortunetly it looks like the client (testing on Chrome 18) doesn't receive data, but the server says it is sending...

Chrome doesn't say anything

Here are main server methods:

private function decode($payload) {
    $length = ord($payload[1]) & 127;

    if ($length == 126) {
        $masks = substr($payload, 4, 4);
        $data = substr($payload, 8);
    } elseif ($length == 127) {
        $masks = substr($payload, 10, 4);
        $data = substr($payload, 14);
    } else {
        $masks = substr($payload, 2, 4);
        $data = substr($payload, 6);
    }

    $text = '';
    for ($i = 0; $i < strlen($data); ++$i) {
        $text .= $data[$i] ^ $masks[$i % 4];
    }

    $text = base64_decode($text);
    return $text;
}

private function encode($text) {
    $text = base64_encode($text);
    // 0x1 text frame (FIN + opcode)
    $b1 = 0x80 | (0x1 & 0x0f);
    $length = strlen($text);

    if ($length <= 125)
        $header = pack('CC', $b1, $length);
    elseif ($length > 125 && $length < 65536)
        $header = pack('CCS', $b1, 126, $length);
    else 
        $header = pack('CCN', $b1, 127, $length);

    return $header . $text;
} 

protected function process($user, $msg) {
    echo '<< '.$msg.N;
    if (empty($msg)) {
        $this->send($user->socket, $msg);
        return;
    }
}

protected function send($client, $msg) {
    $msg = $this->encode($msg);
    echo '>> '.$msg.N;
    socket_write($client, $msg, strlen($msg));
}

Upvotes: 3

Views: 2758

Answers (1)

simonc
simonc

Reputation: 42165

If you're sending a test message >125 bytes but <65536, your problem might be caused by a faulty format string to pack. I think this one should be 'CCn' (your current code writes the 2 bytes of the length in the wrong order).

If that doesn't help, you could try some client-side logging:

  • Does the onopen callback run to prove that the initial handshake completed successfully?
  • Do the onerror or onclose callbacks run, either after connection or after your server sends its message?

Upvotes: 1

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