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/**
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* Created by GoLand.
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* User: link1st
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* Date: 2019-07-25
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* Time: 17:27
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*/
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package helper
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import (
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"net"
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)
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// 获取服务器Ip
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// func GetServerIp() (ip string) {
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// addrs, err := net.InterfaceAddrs()
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// if err != nil {
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// return ""
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// }
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// for _, address := range addrs {
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// // 检查ip地址判断是否回环地址
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// if ipNet, ok := address.(*net.IPNet); ok && !ipNet.IP.IsLoopback() {
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// if ipNet.IP.To4() != nil {
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// ip = ipNet.IP.String()
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// }
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// }
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// }
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// return
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// }
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/**** 问题：我在本地多网卡机器上，运行分布式场景，此函数返回的ip有误导致rpc连接失败。 遂google结果如下：
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*** 1、https://www.jianshu.com/p/301aabc06972
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*** 2、https://www.cnblogs.com/chaselogs/p/11301940.html
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****/
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func GetServerIp() string {
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ip, err := externalIP()
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if err != nil {
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return ""
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}
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return ip.String()
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}
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func externalIP() (net.IP, error) {
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ifaces, err := net.Interfaces()
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if err != nil {
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return nil, err
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}
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for _, iface := range ifaces {
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if iface.Flags&net.FlagUp == 0 {
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continue // interface down
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}
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if iface.Flags&net.FlagLoopback != 0 {
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continue // loopback interface
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}
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addrs, err := iface.Addrs()
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if err != nil {
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return nil, err
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}
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for _, addr := range addrs {
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ip := getIpFromAddr(addr)
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if ip == nil {
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continue
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}
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return ip, nil
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}
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}
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return nil, err
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}
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func getIpFromAddr(addr net.Addr) net.IP {
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var ip net.IP
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switch v := addr.(type) {
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case *net.IPNet:
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ip = v.IP
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case *net.IPAddr:
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ip = v.IP
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}
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if ip == nil || ip.IsLoopback() {
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return nil
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}
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ip = ip.To4()
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if ip == nil {
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return nil // not an ipv4 address
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}
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return ip
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}
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