async

type Ctx interface {
	Cancel()

	WithCancel(parent context.Context) context.Context
	WithDeadline(parent context.Context, d time.Time) context.Context
	WithTimeout(parent context.Context, timeout time.Duration) context.Context
	// contains filtered or unexported methods
}

type Value interface {
	Err() error
	Get() interface{}
	Cancel()
	Value(func(err error)) interface{}
	ValueCb(func(val interface{}) error) error
	// contains filtered or unexported methods
}