freeport.go

package freeport

import (
	"net"
	"strconv"
)

func GetFreePort() (string, error) {
	l, err := net.Listen("tcp", "127.0.0.1:0")
	defer l.Close()
	if err != nil {
		return "", err
	}
	p := l.Addr().(*net.TCPAddr).Port
	return strconv.Itoa(p), err
}