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thin
、cramp
和http_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HttpRouter
或WebApp
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