networking - Could a name server resolve IP addresses dynamically based on some strategy?

We have registered some name servers for DNS resolving for our website which is deployed in several data centers.

Our current strategy of DNS resolve is that based on the different client IP addresses, the name server will return different IP addresses for the same domain. For example, if the client IP address is from North America, the name server will return an IP address which is the IP address of our North America data center.

But the client IP address sometimes is not the real IP address of the users. It may be an IP address of DNS which belongs to an ISP or a proxy server. On the other hand, if one of our data centers is down, we want our name server exclude that IP address which belongs to the crashed data center. So we hope that we can get a more dynamic strategy for our DNS resolve. Is there a solution for that?