Playing with rack

config.ru

class Rack::Reverse

  def initialize(app)
    @app = app
  end

  def call(env)
    status, headers, body = @app.call(env)
    [status, headers, [body.join.reverse]]
  end

end

class Rack::Timer

  def initialize(app)
    @app = app
  end

  def call(env)
    before = Time.now
    status, headers, body = @app.call(env)
    after = Time.now
    prefix = "Response time: #{after - before}\n\n"
    [status, headers, [prefix] + body]
  end

end

class Rack::Delay

  def initialize(app, delay)
    @app = app
    @delay = delay
  end

  def call(env)
    sleep(@delay)
    @app.call(env)
  end

end

class Hola

  def status
    200
  end

  def headers
    { 'Content-Type' => 'text/plain' }
  end

  def body
    body = 'Hello, world!'
    body = 'Bonjour tout le monde!' if ['fr', 'fr-fr', 'french'].include?(language)
    body = 'Hallo, Welt!'           if ['de', 'de-de', 'german'].include?(language)
    [body]
  end

  def call(env)
    @env = env
    [status, headers, body]
  end

  def self.call(env)
    new.call(env)
  end

  protected
  def language
    @language ||= Rack::Request.new(@env).query_string.downcase
  end

end

use Rack::Timer

map '/' do
  use Rack::Reverse
  use Rack::Delay, 1.5
  run Hola
end

map '/author' do
  run Proc.new { |env| [200, { 'Content-Type' => 'text/plain'}, ['Christopher Patuzzo']] }
end