GithubClientCache - First, not ideal attempt, at caching `github_api` responses

gistfile1.rb

class GithubClientCache
  CACHE = ActiveSupport::Cache::FileStore.new('cache')
  CACHE_EXPIRY_PERIOD = (60 * 60 * 24 * 365) # 1 year

  def initialize(current_object, arg_stack = [])
    @current_object = current_object
    @arg_stack = arg_stack
  end

  def method_missing(method, *args, &block)
    new_arg_stack = @arg_stack + [[method, *args]]

    if args.size > 0
      CACHE.fetch(new_arg_stack.inspect, expires_in: cache_expiry_time) do
        @current_object.send(method, *args, &block)
      end.tap do |result|
        # Ensure the result's body is a Hashie::Mash
        # This doesn't happen on deserialization
        result.body = if result.body.is_a?(Array)
                        result.body.map { |i| Hashie::Mash.new(i) }
                      else
                        Hashie::Mash.new(result.body)
                      end
      end
    else
      self.class.new(@current_object.send(method, *args, &block), new_arg_stack)
    end
  end

  private

  def cache_expiry_time
    Time.now + CACHE_EXPIRY_PERIOD
  end
end