Using Rack Middleware for good and evil

So we all know that Rack is awesome, and that we can use Rack::Middleware for all sorts of things: debugging, caching and a whole host more.

What all these have in common (apart from maybe Rack::Evil) is that they’re all helpful. They all make writing Rack applications easier. Not my Middleware though.

Introducing Rack::Shuffler

module Rack
  class Shuffler
    def initialize(app)
      @app = app
      @responses = []

    def call(env)
      @responses <<
      @responses.delete_at(rand(@responses.size)) if @responses.size > 100

I suggest you add it to a colleague’s app late on a Friday afternoon, and see how long it takes to drive them to insanity.