Function FindFreePort

testutil/testutil.go:219–235

FindFreePort returns an available port that can be used for a server. If any errors are encountered, this function will panic and fail the current test.

()

	cachedDevBuildPath = fullpath

	return cachedDevBuildPath
}

// FindFreePort returns an available port that can be used for a server. If any errors are
// encountered, this function will panic and fail the current test.
func FindFreePort() int {
	listener, err := net.Listen("tcp", ":0")
	if err != nil {
		panic(fmt.Sprintf("unable to find available TCP port: %v", err.Error()))
	}
	freePort := listener.Addr().(*net.TCPAddr).Port
	err = listener.Close()
	if err != nil {
		panic(fmt.Sprintf("unable to find available TCP port: %v", err.Error()))
	}

	if freePort < 0 {
		panic(fmt.Sprintf("unable to find available TCP port; found port %v", freePort))
	}