package specgen import ( "net" "strconv" "github.com/pkg/errors" ) // Find a random, open port on the host func GetRandomPort() (int, error) { l, err := net.Listen("tcp", ":0") if err != nil { return 0, errors.Wrapf(err, "unable to get free TCP port") } defer l.Close() _, randomPort, err := net.SplitHostPort(l.Addr().String()) if err != nil { return 0, errors.Wrapf(err, "unable to determine free port") } rp, err := strconv.Atoi(randomPort) if err != nil { return 0, errors.Wrapf(err, "unable to convert random port to int") } return rp, nil }