iRule to resolve DNS for GTM (wide-ip if possible)

FYI

This is irule that can include on Listener. (But not wide ip)

The irule resolve dynamic IP from AWS and return to user.

Cloud server is ABC.ap-southeast-1.elb.amazonaws.com
when DNS_REQUEST {
if {([string tolower [DNS::question name]] equals "ABC.com") && ([DNS::question type] equals "A")} {
    set aws [RESOLV::lookup @8.8.8.8 -a "ABC.ap-southeast-1.elb.amazonaws.com"]
    DNS::answer insert "[DNS::question name]. 111 [DNS::question class] [DNS::question type] [lindex $aws 0]"
    DNS::return
    }
}