require 'sinatra/base'
require_relative 'cpi_fetcher'

class App < Sinatra::Base
  get '/' do
    current_cpi = fetcher.cpi
    halt 502 unless current_cpi

    expires 300, :public, :must_revalidate
    content_type :text
    "#{current_cpi}\n"
  end

  run! if app_file == $PROGRAM_FILE

  private

  def fetcher
    @fetcher ||= CPIFetcher.new
  end
end