padrino && websockets

Question

我正在寻找一种在Padrino应用程序中打开和使用websockets的方法。我知道Padrino使用单线程工作，但我正在寻找一种方法来打开websockets，并在其"onopen“、"onclose”"onmessage“方法和Padrino控制器之间共享变量。

你知道它是怎么做到的吗？

我看过的链接：

Examples of Eventmachine usage with Padrino and Sinatra (只有Sinatra为我工作) em-websocket on GitHub

更新1:这是我的main.rb：

    require 'rubygems'      # <-- Added this require
require 'em-websocket'
require 'padrino-core'
require 'thin'

require File.expand_path("../config/boot.rb", __FILE__)

SOCKETS = []
EventMachine.run do     # <-- Changed EM to EventMachine
#  class App < Sinatra::Base
#      get '/' do
#          SOCKETS.each {|s| s.send "fooooo"}
#          return "foo"
#      end
#  end

  EventMachine::WebSocket.start(:host => '0.0.0.0', :port => 8080) do |ws| # <-- Added |ws|
      # Websocket code here
      ws.onopen {
          ws.send "connected!!!!"
          SOCKETS << ws
      }

      ws.onmessage { |msg|
          puts "got message #{msg}"
          ws.send "ECHO: #{msg}"
      }

      ws.onclose   {
          ws.send "WebSocket closed"
          SOCKETS.delete ws
      }

  end

  # You could also use Rainbows! instead of Thin.
  # Any EM based Rack handler should do.
  #App.run!({:port => 3000})    # <-- Changed this line from Thin.start to App.run!
  Thin::Server.start Padrino.application, '0.0.0.0', 3000

结束

我得到了这个异常：

/home/cstore/.rvm/gems/ruby-1.9.2-p290@runtime/gems/thin-1.2.11/lib/thin/daemonizing.rb:2:in `require': no such file to load -- daemons (LoadError)
    from /home/cstore/.rvm/gems/ruby-1.9.2-p290@runtime/gems/thin-1.2.11/lib/thin/daemonizing.rb:2:in `<top (required)>'
    from /home/cstore/.rvm/gems/ruby-1.9.2-p290@runtime/gems/thin-1.2.11/lib/thin/server.rb:50:in `<class:Server>'
    from /home/cstore/.rvm/gems/ruby-1.9.2-p290@runtime/gems/thin-1.2.11/lib/thin/server.rb:48:in `<module:Thin>'
    from /home/cstore/.rvm/gems/ruby-1.9.2-p290@runtime/gems/thin-1.2.11/lib/thin/server.rb:1:in `<top (required)>'
    from main.rb:39:in `block in <main>'
    from /home/cstore/.rvm/gems/ruby-1.9.2-p290@runtime/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:in `call'
    from /home/cstore/.rvm/gems/ruby-1.9.2-p290@runtime/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:in `run_machine'
    from /home/cstore/.rvm/gems/ruby-1.9.2-p290@runtime/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:in `run'
    from main.rb:9:in `<main>'

更新2:多亏了Nathan！我刚刚在Gemfile中添加了“守护进程”并重新加载了我的应用程序。

Answer 1

也许你需要安装守护进程：

编辑Gemfile：

# Adding this
gem 'daemons'

安装缺少的gem：

$ bundle install

Answer 2

这个例子中有什么特别之处：https://github.com/igrigorik/em-websocket和Any success with Sinatra working together with EventMachine WebSockets?不能与Padrino一起工作，但能与Sinatra一起工作？你能解释一下你得到的错误和这些例子失败的原因(Stacktrace)吗？也许我们能帮上忙。

Answer 3

我偶然发现了这篇文章，它对我有一点帮助，但我想为其他任何可能偶然发现它的人提供一个替代的解决方案。我选择直接修改config.ru并挂载websocket-rack应用程序。

下面是我的config.ru，其中WSApp是Rack::WebSocket::Application的子类，放在lib/目录中(因此由Padrino自动加载)：

#!/usr/bin/env rackup
# encoding: utf-8

# This file can be used to start Padrino,
# just execute it from the command line.

require File.expand_path("../config/boot.rb", __FILE__)

# Setup routes
map '/' do
  run Padrino.application
end
map '/ws' do
  run WSApp.new
end