streams

type AttachConfig struct {
	Terminal bool

	// CloseStdin means if the stdin of client's stream is closed by the
	// caller, the stdin of process's stream should be closed.
	CloseStdin bool

	// UseStdin/UseStdout/UseStderr can be used to check the client's stream
	// is nil or not. It is hard to check io.Write/io.ReadCloser != nil
	// directly, because they might be specific type, which means
	// (typ != nil) always is true.
	UseStdin, UseStdout, UseStderr bool

	Stdin          io.ReadCloser
	Stdout, Stderr io.Writer
}

type Pipes struct {
	Stdin io.WriteCloser

	Stdout io.ReadCloser

	Stderr io.ReadCloser
}

type Stream interface {
	Stdin() io.ReadCloser
	StdinPipe() io.WriteCloser
	NewStdinInput()
	NewDiscardStdinInput()
	Stdout() io.WriteCloser
	AddStdoutWriter(w io.WriteCloser)
	AddStderrWriter(w io.WriteCloser)
	Stderr() io.WriteCloser
	NewStdoutPipe() io.ReadCloser
	NewStderrPipe() io.ReadCloser
	Attach(ctx context.Context, cfg *AttachConfig) <-chan error
	CopyPipes(p Pipes)
	Close() error
	// sync.WaitGroup interface
	Wait()
}