So at Hashrocket, we’ve been deploying a number of apps to Engine Yard Cloud. Some of these apps have required the use of background jobs. A library that facilitates that is called Resque. Once set up¹, it has a Sinatra web app you can use to monitor the queue’s progress. To make a long story short, it isn’t trivial to setup Resque Web on Engine Yard Cloud. This is what we did to make it work:

In your environment.rb add the following line:

1 Rails::Initializer.run do |config|
2   #[...]
3   config.middleware.use 'ResqueWeb'
4 end

Then create a library under RAILS_ROOT/lib/resque_web.rb with the following:

 1 require 'sinatra/base'
 2 class ResqueWeb < Sinatra::Base
 3   require 'resque/server'
 4   use Rack::ShowExceptions
 5   def call(env)
 6     if env["PATH_INFO"] =~ /^\/resque/
 7       env["PATH_INFO"].sub!(/^\/resque/, '')
 8       env['SCRIPT_NAME'] = '/resque'
 9       app = Resque::Server.new
10       app.call(env)
11     else
12       super
13     end
14   end
15 end

That’s it. Deploy your app to staging to test it and boom!

¹ This assumes you already have Resque installed in your EY Cloud app.