copier

type CloseReader interface {
	CloseRead() error
}

type CloseWriter interface {
	CloseWrite() error
}

type Copier interface {
	CloseReader
	CloseWriter
	GracefulStopper

	Written() int64
	Err() error

	Copy()
}

type GracefulStopper interface {
	Waiter
	Shutdown(ctx context.Context) error
}

type Group struct {
	// contains filtered or unexported fields
}

type Waiter interface {
	Wait(ctx context.Context) error
}