Rails应用程序中的AMQP订户 [英] AMQP subscriber inside Rails app

问题描述

是否可以通过我的Rails应用启动AMQP订户?可能通过初始化程序之类的东西.

Is it possible to start an AMQP subscriber with my Rails app? Possibly through an initializer or something.

我想让它同时运行，并且还可以与Rails模型进行交互.下面是我的意思的伪代码示例.

I'd like to have it running at the same time that can also interact with Rails models. Below is a pseudo-code example of what I mean.

queue.subscribe do |msg,body|
  Foo.create(....)
end

推荐答案

我通常通过加载Rails环境的单独消息传递守护程序来做到这一点.

I usually do this via a separate messaging daemon which loads the rails environment.

因此，在rails_root/script/myapp_daemon.rb中，一个非常简单的示例如下所示:

So a very simplistic example would look like this in rails_root/script/myapp_daemon.rb :

    #!/usr/bin/env ruby
    require 'rubygems'
    require 'amqp'
    require 'daemons'

    ENV["RAILS_ENV"] ||= "development"
    require File.dirname(__FILE__) + "/../config/environment"

    options = { :backtrace => true, :dir => '.', :log_output => true}

    Daemons.run_proc('myapp_daemon', options) do
      EventMachine.run do
        connection = AMQP.connect(:host => "127.0.0.1")

        channel = AMQP::Channel.new(connection)
        queue    = channel.queue("/myapp_daemon", :durable => true)
        exchange = channel.direct("")

        queue.subscribe do |payload|
          obj = JSON.parse(payload)
          #... handle messages here, utilize your rails models
          Foo.create(...)
        end
      end
    end

您还需要在Gemfile中使用正确的gem需求:amqp，守护程序，eventmachine

You would also need the right gem requires in your Gemfile: amqp, daemons, eventmachine

然后与您的应用程序一起手动运行它:

Then either run it manually alongside your app:

RAILS_ENV=development script/myapp_daemon.rb run

或从您的一个应用程序初始化程序启动它:

Or start it from one of your app initializers:

system('script/myapp_daemon.rb start')

要深入研究amqp，请查看以下内容，这将提供一个不错的高级概述: http://www.rubyinside.com/Why-rubyists-should-care-about-messaging-a-high-level-intro-5017.html

To dig into amqp check out the following, this will give a nice high level overview: http://www.rubyinside.com/why-rubyists-should-care-about-messaging-a-high-level-intro-5017.html

这通过工作示例给出了非常详细的解释: http://rubydoc.info/github/ruby-amqp/amqp/master/file/docs/Exchanges.textile#Publishing_messages_as_immediate_

This gives a very detailed explanation with working examples: http://rubydoc.info/github/ruby-amqp/amqp/master/file/docs/Exchanges.textile#Publishing_messages_as_immediate_

最后看看Bunny是否能够完成您需要为客户提供的所有服务，这很简单: https://github.com/celldee/bunny/wiki/Using-Bunny

Finally see if Bunny accomplishes everything you need for the client, it is simpler: https://github.com/celldee/bunny/wiki/Using-Bunny

希望有帮助

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