一个域名，根据用户 ip 就近回源，用哪种方案比较好？

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例如美国用户访问时回源到美国的源站。

伪代码表示我想实现的意图：

Browser:
    Access CDN domain (cdn.com)
CDN:
    if user IP is US:
        Serve from us.com origin
    else if user IP is Europe:
        Serve from eu.com origin
    else if user IP is China:
        Serve from cn.com origin
    else:
        Default action (not specified)

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