Rubygems Redis

gistfile1.rb

# rubygems.org / config / initializers / redis.rb
if Rails.env.test? || Rails.env.cucumber?
  $redis = Redis.new(:db => 1)
else
  $redis = Redis.connect(:url => ENV['REDISTOGO_URL'])
end

# rubygems.org / app / models / download.rb
class Download
  def self.incr(name)
    $redis.incr(rubygem_key(name))
  end
  
  def self.rubygem_key(name)
    "downloads:rubygem:#{name}"
  end
  
  def self.for_rubygem(name)
    $redis.get(rubygem_key(name)).to_i
  end
end
 
# rubygems.org / config / application.rb
module Gemcutter
  class Application < Rails::Application
    config.middleware.use "Hostess"
  end
end

# rubygems.org / app / middleware / hostess.rb
class Hostess < Sinatra::Base
  get "/gems/*.gem" do
    name = Version.rubygem_name_for(full_name)
    Download.incr(name, full_name)
  end

  def full_name
    @full_name ||= params[:splat].join.chomp('.gem')
  end
end