go golang get IP address

func getIP() string {
ifaces, err := net.Interfaces()
if err != nil {
f.Println(err)
return ""
}
var strs []string
for _, i := range ifaces {
addrs, err := i.Addrs()
if err != nil {
f.Println(err)
continue
}
for _, addr := range addrs {
switch v := addr.(type) {
case *net.IPNet:
ip := v.IP
strs = append(strs, ip.String())
case *net.IPAddr:
// ip := v.IP
// strs = append(strs, ip.String())
}
}
}
for _, v := range strs {
if strings.HasPrefix(v, "192.168.") {
return v
}
}
for _, v := range strs {
if strings.HasPrefix(v, "10.") {
return v
}
}
for _, v := range strs {
if strings.HasPrefix(v, "172.") {
return v
}
}
for _, v := range strs {
if v != "127.0.0.1" && v != "::1" {
return v
}
}
return strs[0]
}