package rocketmq
import (
	"net"
	"strings"
)


func GetLocalIp4() (ip string) {
	interfaces,err:= net.Interfaces()
	if err != nil {
		return
	}

	for _, face:= range interfaces{
		if strings.Contains(face.Name,"lo"){
			continue
		}
		addrs,err := face.Addrs()
		if err != nil {
			return
		}

		for _,addr := range addrs {
			if ipnet, ok := addr.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
				if ipnet.IP.To4() != nil {
					currIp := ipnet.IP.String()
					if !strings.Contains(currIp,":")&&currIp != "127.0.0.1" && isIntranetIpv4(currIp){
						ip = currIp
					}
				}
			}
		}
	}

	return
}

func isIntranetIpv4(ip string) bool{
	if  strings.HasPrefix(ip,"192.168.") || strings.HasPrefix(ip,"169.254.")  {
		return true
	}
	return false
}