package script

import (
	"bytes"
	"math/rand"
	"net"
	"time"
)

func GetIpAddress() string {
	addrs, _ := net.InterfaceAddrs()
	for _, value := range addrs {
		if ipnet, ok := value.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
			if ipnet.IP.To4() != nil {
				return ipnet.IP.String()
			}
		}
	}
	return ""
}

const char = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"

func RandChar(size int) string {
	source := rand.NewSource(time.Now().UnixNano()) // 产生随机种子
	var s bytes.Buffer
	for i := 0; i < size; i++ {
		s.WriteByte(char[source.Int63()%int64(len(char))])
	}
	return s.String()
}