cookies - Cookie でユーザーの位置を設定する - 効率的なワークフロー?

Question

ユーザーがサイトにアクセス

Has user got "location" cookie set?

    Yes - Print "country" value from cookie on page
           - Finish

    No  -  Do geoip look up with nginx

        Was this successful?

            Yes - Store value in cookie
                   - Print "country" value from cookie on page
                   - Finish

            No  - Do not print "country" on page
                   - Finish

これが最も効率的で適切なワークフローですか?