When staring a server on all interfaces, log hints of how to access it easily. Nice to have in development of the app

logAccessInfo.go

func logAccessInfo(addr string, port int, path, protocol string) {
	ifaces, err := net.Interfaces()
	if err != nil {
		logrus.Infof("access it via %s://%s%s", protocol, addr, path)
	}
	for _, i := range ifaces {
		addrs, err := i.Addrs()
		if err != nil {
			continue
		}
		encodeV6 := func(ip interface{}) string {
			var ipString string
			switch v := ip.(type) {
			case *net.IPAddr:
				ipString = v.IP.String()
			case *net.IPNet:
				ipString = v.IP.String()
			}

			if strings.Contains(ipString, ":") {
				ipString = "[" + ipString + "]"
			}
			return ipString
		}
		for _, a := range addrs {
			address := encodeV6(a)
			if strings.Index(address, "[::") == 0 {
				continue
			}
			logrus.Infof("access it via %s://%s:%v%s", protocol, address, port, path)
		}
	}
}