如何使用Celluloid从线程池运行HTTP请求？

Question

我正在使用Ruby1.9.3，并在MacOSX10.7上进行测试。

我有一个Sender类，它应该向某个URL发送请求：

require "celluloid"
require "curb"

class Sender
  include Celluloid

  def send(msg)    
    Curl.get($URL) do |url|
      url.headers["content-type"] = "text/html;charset=utf-8"
    end
  rescue Exception => e
    $LOG.error "[erro]-> [ #{e.message} "
  end
end

我有另一个进程，它应该接收来自RabbitMQ队列的消息，并使用Sender发送请求。

 AMQP.start(:host => $AMQP_URL) do |connection|
   @channel ||= AMQP::Channel.new(connection)
   @queue   ||= @channel.queue("results")

   pool = Sender.pool

   @queue.subscribe do |metadata, body|
      msg = MessagePack.unpack(body)        
      pool.send(msg)
  end
 end

当我运行它时，我得到：

15:56:59 results.1    | I, [2013-02-12T15:56:59.422192 #44490]  INFO -- : Terminating 5 actors...
15:56:59 results.1    | E, [2013-02-12T15:56:59.422640 #44490] ERROR -- : Celluloid::PoolManager crashed!
15:56:59 results.1    | NoMethodError: undefined method `each' for nil:NilClass
15:56:59 results.1    | /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/facter-1.6.13/lib/facter/macosx.rb:39:in `<top (required)>'
15:56:59 results.1    | /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/facter-1.6.13/lib/facter/util/loader.rb:81:in `load'
15:56:59 results.1    | /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/facter-1.6.13/lib/facter/util/loader.rb:81:in `load_file'
15:56:59 results.1    | /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/facter-1.6.13/lib/facter/util/loader.rb:43:in `block (2 levels) in load_all'
15:56:59 results.1    | /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/facter-1.6.13/lib/facter/util/loader.rb:38:in `each'
15:56:59 results.1    | /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/facter-1.6.13/lib/facter/util/loader.rb:38:in `block in load_all'
15:56:59 results.1    | /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/facter-1.6.13/lib/facter/util/loader.rb:35:in `each'
15:56:59 results.1    | /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/facter-1.6.13/lib/facter/util/loader.rb:35:in `load_all'
15:56:59 results.1    | /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/facter-1.6.13/lib/facter/util/collection.rb:72:in `fact'
15:56:59 results.1    | /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/facter-1.6.13/lib/facter.rb:94:in `block (2 levels) in singletonclass'
15:56:59 results.1    | /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/celluloid-0.12.3/lib/celluloid.rb:37:in `cores'
15:56:59 results.1    | /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/celluloid-0.12.3/lib/celluloid/pool_manager.rb:12:in `initialize'
15:56:59 results.1    | /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/celluloid-0.12.3/lib/celluloid/calls.rb:57:in `dispatch'
15:56:59 results.1    | /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/celluloid-0.12.3/lib/celluloid/actor.rb:323:in `block in handle_message'
15:56:59 results.1    | /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/celluloid-0.12.3/lib/celluloid/tasks/task_fiber.rb:22:in `block in initialize'
15:56:59 results.1    | E, [2013-02-12T15:56:59.423117 #44490] ERROR -- : Celluloid::PoolManager#finalize crashed!
15:56:59 results.1    | NoMethodError: undefined method `+' for nil:NilClass
15:56:59 results.1    | /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/celluloid-0.12.3/lib/celluloid/pool_manager.rb:26:in `finalize'
15:56:59 results.1    | /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/celluloid-0.12.3/lib/celluloid/actor.rb:376:in `block in run_finalizer'
15:56:59 results.1    | /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/celluloid-0.12.3/lib/celluloid/tasks/task_fiber.rb:22:in `block in initialize'
15:56:59 results.1    | I, [2013-02-12T15:56:59.424508 #44490]  INFO -- : Shutdown completed cleanly
15:56:59 results.1    | /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/facter-1.6.13/lib/facter/macosx.rb:39:in `<top (required)>': undefined method `each' for nil:NilClass (NoMethodError)
15:56:59 results.1    |   from /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/facter-1.6.13/lib/facter/util/loader.rb:81:in `load'
15:56:59 results.1    |     from /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/facter-1.6.13/lib/facter/util/loader.rb:81:in `load_file'
15:56:59 results.1    |     from /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/facter-1.6.13/lib/facter/util/loader.rb:43:in `block (2 levels) in load_all'
15:56:59 results.1    |     from /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/facter-1.6.13/lib/facter/util/loader.rb:38:in `each'
15:56:59 results.1    |     from /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/facter-1.6.13/lib/facter/util/loader.rb:38:in `block in load_all'
15:56:59 results.1    |     from /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/facter-1.6.13/lib/facter/util/loader.rb:35:in `each'
15:56:59 results.1    |     from /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/facter-1.6.13/lib/facter/util/loader.rb:35:in `load_all'
15:56:59 results.1    |     from /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/facter-1.6.13/lib/facter/util/collection.rb:72:in `fact'
15:56:59 results.1    |     from /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/facter-1.6.13/lib/facter.rb:94:in `block (2 levels) in singletonclass'
15:56:59 results.1    |     from /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/celluloid-0.12.3/lib/celluloid.rb:37:in `cores'
15:56:59 results.1    |     from /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/celluloid-0.12.3/lib/celluloid/pool_manager.rb:12:in `initialize'
15:56:59 results.1    |     from /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/celluloid-0.12.3/lib/celluloid/calls.rb:57:in `dispatch'
15:56:59 results.1    |     from /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/celluloid-0.12.3/lib/celluloid/actor.rb:323:in `block in handle_message'
15:56:59 results.1    |     from /Users/info/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/celluloid-0.12.3/lib/celluloid/tasks/task_fiber.rb:22:in `block in initialize'
15:56:59 results.1    | exited with code 1

因为池管理器，我是否做错了什么让进程崩溃的事情？

Answer 1

您的答案在卷轴中得到了否定的演示。特别是在它的Rack处理程序中。你可以从这里潜入，然后从那里逆向工程你需要的一切：

• https://github.com/celluloid/reel/blob/master/lib/rack/handler/reel.rb#L41

Reel是一个非常棒的演示，它展示了Celluloid(：：IO)的功能，以及你想要的东西.除非是相反的。它通过一个池接收请求，这是你的情况的否定。

正如你所知道的，主要的事情是你在和PoolManager说话，而不是任何一个演员。这是你可以重新思考你的方法的主要部分。考虑到这一点，重构：

Celluloid::Actor[:reel_rack_pool] = ::Reel::RackWorker.pool(size: options[:workers], args: [self])
    ::Reel::Server.supervise_as(:reel_server, options[:host], options[:port]) do |connection|
    Celluloid::Actor[:reel_rack_pool].handle(connection.detach)
end

一旦考虑到这些代码，可以随时用新的错误或问题来更新您的问题。你肯定会得到关于#赛洛伊德的帮助(IRC)和/或在细胞的邮件列表中，它是非常活跃和充满敬业和知识丰富的人，他们真的欢迎那些不习惯赛勒洛德的人。

• http://groups.google.com/group/celluloid-ruby