使用socketo.me网站上的说明,我正在尝试使用 Ratchet for php 使 websockets 工作。根据说明,我在 composer.json 文件中需要 Ratchet 版本 0.2.*。我使用的是 php 5.4.9-4ubuntu2 和 Apache 2。对于浏览器,我使用的是 Firefox 21.0 和 Chrome 26.0.1410.63。该网站称 Rachet 支持 Firefox 6-20 和 Chrome 13-26,但使用 Firefox 21 的结果与使用 Chrome 26 的结果几乎相同。
这是我实现 MessageComponentInterface 的类。
<?php
namespace WebsocketTest;
use Ratchet\MessageComponentInterface;
use Ratchet\ConnectionInterface;
require dirname (__DIR__).'/../../../../vendor/autoload.php';
class Chat implements MessageComponentInterface
{
protected $clients;
public function __construct ()
{
$this->clients = new \SplObjectStorage;
}
public function onOpen (ConnectionInterface $conn)
{
// Store the new connection to send messages to later
$this->clients->attach ($conn);
echo "New connection! ({$conn->resourceId})\n";
}
public function onMessage (ConnectionInterface $from, $msg)
{
$numRecv = count ($this->clients) - 1;
echo sprintf ('Connection %d sending message "%s" to %d other connection%s'."\n", $from->resourceId, $msg, $numRecv, $numRecv == 1 ? '' : 's');
foreach ($this->clients as $client)
{
if ($from !== $client)
{
// The sender is not the receiver, send to each client connected
$client->send ($msg);
}
}
}
public function onClose (ConnectionInterface $conn)
{
// The connection is closed, remove it, as we can no longer send it messages
$this->clients->detach ($conn);
echo "Connection {$conn->resourceId} has disconnected\n";
}
public function onError (ConnectionInterface $conn, \Exception $e)
{
echo "An error has occurred: {$e->getMessage()}\n";
$conn->close ();
}
}
这是我的shell脚本代码。
<?php
use Ratchet\Server\IoServer;
use WebsocketTest\Chat as Chat;
require_once __DIR__.'/Chat.php';
$server = IoServer::factory (new Chat (), 8080);
$server->run ();
这是我从 shell 脚本得到的输出。
New connection! (38)
Connection 38 sending message "GET / HTTP/1.1
Upgrade: websocket
Connection: Upgrade
Host: www.zf2.dev:8080
Origin: http://www.zf2.dev
Pragma: no-cache
Cache-Control: no-cache
Sec-WebSocket-Key: YHbsxEgVhWTDJjaBJAGHdQ==
Sec-WebSocket-Version: 13
Sec-WebSocket-Extensions: x-webkit-deflate-frame
" to 1 other connection
New connection! (39)
Connection 39 sending message "GET / HTTP/1.1
Host: www.zf2.dev:8080
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:21.0) Gecko/20100101 Firefox/21.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Sec-WebSocket-Version: 13
Origin: http://www.zf2.dev
Sec-WebSocket-Key: EPpLFS3bXx/eC+WaoNDacA==
Connection: keep-alive, Upgrade
Pragma: no-cache
Cache-Control: no-cache
Upgrade: websocket
" to 2 other connections
Connection 37 has disconnected
Connection 38 has disconnected
这是我的 JavaScript 代码。创建连接后,我将其输出到 javascript 控制台。
var conn = null;
function test_websockets ()
{
conn = new WebSocket ('ws://www.zf2.dev:8080');
console.log (conn);
conn.onopen = function (e) { console.log ("Connection established!"); };
conn.onmessage = function (e) { console.log (e.data); };
conn.onclose = function (e) { console.log ('closed') };
// conn.send ('sending message from the client');
}
function test_ws_message ()
{
conn.send ('the test message');
}
这是我在 Chrome 中的 javascript 控制台中得到的输出。
WebSocket {binaryType: "blob", extensions: "", protocol: "", onclose: null, onerror: null…}
html5test.js:34
Uncaught Error: InvalidStateError: DOM Exception 11 html5test.js:47
test_ws_message html5test.js:47
onclick
这是我从 Firefox 中的 Firebug 得到的输出。
WebSocket { url="ws://www.zf2.dev:8080", readyState=0, bufferedAmount=0, more...}
html5test.js (line 34)
InvalidStateError: An attempt was made to use an object that is not, or is no longer, usable
[Break On This Error]
conn.send ('the test message');
html5test.js (line 47)
closed
html5test.js (line 38)
Firefox can't establish a connection to the server at ws://www.zf2.dev:8080/.
conn = new WebSocket ('ws://www.zf2.dev:8080');
请注意,Firefox 显示连接立即关闭,而 Chrome 没有。但是,Chrome 从未显示连接已打开,因此我认为它在任一浏览器上都不起作用。看起来服务器脚本认为连接已经建立,但是两个浏览器都没有向我显示“连接已建立!” 指示调用了 onopen 方法的消息。我能够找到一条评论,暗示不兼容版本的 websockets“握手”可能会导致这种情况发生,但我从未找到任何有关其他版本的 Ratchet 或我需要做些什么才能让兼容版本在客户端上运行和服务器。我还发现一些评论说有时 onopen 根本不会被调用,我很难相信。