#150 Rails Metal (revised)

Jan 27, 2012 | 6 minutes | Rack

Rails metal may have been removed in Rails 3, but it is possible to bypass the entire Rails stack through middleware as shown in this episode.

Click to Play Video ▶

Download:
source codeProject Files in Zip (81.1 KB)
mp4Full Size H.264 Video (13.9 MB)
m4vSmaller H.264 Video (7.64 MB)
webmFull Size VP8 Video (9.06 MB)
ogvFull Size Theora Video (17.9 MB)

Browse Source Code

Resources

          terminal
        
rake middleware
rails s -e production -d
ab -n 100 -r http://localhost:3000/processes/old_list
ab -n 100 -r http://localhost:3000/processes/list

          app/middleware/process_list.rb
        
class ProcessesList
  def initialize(app)
    @app = app
  end
  
  def call(env)
    if env["PATH_INFO"] == "/processes/list"
      list = `ps -axcr -o 'pid,pcpu,pmem,time,comm'`
      [200, {"Content-Type" => "text/plain"}, [list]]
    else
      @app.call(env)
    end
  end
end

          config/application.rb
        
config.middleware.insert_before 0, "ProcessesList"