application_controller.rb

class ApplicationController < ActionController::Base
  protect_from_forgery with: :exception

  def index
    render text: index_html
  end

  private

  def index_html
    $redis.get "#{deploy_key}:index.html"
  end

  def deploy_key
    # The latest deploy is the first item in the list
    # If a deploy key is passed in, use that deploy, otherwise use the latest
    params[:deploy_key] ? params[:deploy_key] : latest_deploy
  end

  def latest_deploy
    $redis.lindex('manifest_ten_deploys', 0)
  end
end