如何在同一端口上提供 Cramp::Websocket 和普通的 Rack 应用程序



我正在尝试使用相同的端口来提供正常的HTTP流量以及通过Cramp(构建在EventMachine之上(的HTML5 websocket,使用Ruby 1.9.3和Thin 1.3.1。下面是一个最小的自包含示例:

require 'thin'
require 'cramp'
require 'http_router'
Cramp::Websocket.backend = :thin
class SocketApp < Cramp::Action
  self.transport = :websocket
  on_start = :connected
  on_finish = :disconnected
  on_data = :message
  def connected
    puts 'Client connected'
  end
  def disconnected
    puts 'Client disconnected'
  end
  def message(msg)
    puts "Got message: #{msg}"
    render 'Here is your reply'
  end
end
class WebApp
  def call(env)
    [ 200, { 'Content-Type' => 'text/html' }, <<EOF
<html><head>
<script>
  function init() {
    function log(msg) { document.getElementById('log').innerHTML += msg + '<br>'; }
    var socketUri = 'ws://' + document.location.host + '/socket';
    log('Socket URI: ' + socketUri);
    var socket = new WebSocket(socketUri);
    socket.onopen = function(e) {
      log('onopen');
      socket.send('Is there anybody out there?');
      log('sent message');
    };
    socket.onclose = function(e) {
      log('onclose; code = ' + e.code + ', reason = ' + e.reason);
    };
    socket.onerror = function(e) {
      log('onerror');
    };
    socket.onmessage = function(e) {
      log('onmessage; data = ' + e.data);
    };
  }
</script>
</head><body onload='init();'>
  <h1>Serving Cramp::Websocket and normal Rack app on the same port</h1>
  <p id='log'></p>
</body></html>
EOF
    ]
  end
end
app = HttpRouter.new do
  add('/socket').to SocketApp
  add('/').to WebApp.new
end
run app

如果您想自己尝试一下,请将此代码粘贴到名为 config.ru 的文件中并运行 thin start 。您需要安装thincramphttp_router的 gem

这个想法是JavaScript代码与ws://localhost:3000/socket建立WebSocket连接,这回显发送给它的消息,但这并没有按预期工作。open事件触发,发送消息时没有错误,但我们从未收到响应。

从服务器的角度来看,没有建立任何连接,因为Client connected消息不会被打印出来。

使用 thin start -D ,我可以看到 HTTP 101 正在发生,并且正在交换一些二进制数据。

我做错了什么?

更新:如果我将文件分成两部分,撕掉HttpRouter,并在不同的端口上运行两个thin实例,它仍然不起作用。所以问题出在套接字代码上,而不是HttpRouterWebApp上。

好吧,这是作弊,但我最终通过切换到另一个库来解决它:websocket-rack。对于好奇的人,更正后的代码如下:

require 'thin'
require 'http_router'
require 'rack/websocket'
class SocketApp < Rack::WebSocket::Application
  def on_open(env)
    puts 'Client connected'
  end
  def on_close(env)
    puts 'Client disconnected'
  end
  def on_message(env, message)
    puts "Got message: #{message}"
    send_data 'Here is your reply'
  end
end
class WebApp
  def call(env)
    [200, { 'Content-Type' => 'text/html' }, <<EOF
<html><head>
<script>
  function init() {
    function log(msg) { document.getElementById('log').innerHTML += msg + '<br>'; }
    var socketUri = 'ws://' + document.location.host + '/socket';
    log('Socket URI: ' + socketUri);
    var socket = new WebSocket(socketUri);
    socket.onopen = function(e) {
      log('onopen');
      socket.send('Is there anybody out there?');
      log('sent message');
    };
    socket.onclose = function(e) {
      log('onclose; code = ' + e.code + ', reason = ' + e.reason);
    };
    socket.onerror = function(e) {
      log('onerror');
    };
    socket.onmessage = function(e) {
      log('onmessage; data = ' + e.data);
    };
  }
</script>
</head><body onload='init();'>
  <h1>Serving WebSocket and normal Rack app on the same port</h1>
  <p id='log'></p>
</body></html>
EOF
    ]
  end
end
app = HttpRouter.new do
  add('/socket').to(SocketApp.new)
  add('/').to(WebApp.new)
end
run app

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