rack/websocket + rails

socket.rb

# gem 'websocket-rack'
# gem 'thin'

# config.threadsafe! == true
# or whatever Rails4 wants me to do.

require "rack/websocket"

class MyApp < Rack::WebSocket::Application
  def on_message(env, msg)
    send_data("echo: #{msg}")      
  end
end

module ActionController::WebSocket
  def websocket_upgrade(socket_application)
    upgrade_response = socket_application.new.call(request.env)
    self.status, self.headers, self.response_body = upgrade_response
  end
end

class ApplicationController < ActionController::Base
  protect_from_forgery

  include ActionController::WebSocket

  def echo
    websocket_upgrade(MyApp)
  end
end


# bundle exec thin-websocket start