engine

type Engine interface {
	OpenLong(price, amount float64)
	CloseLong(price, amount float64)
	OpenShort(price, amount float64)
	CloseShort(price, amount float64)
	StopLong(price, amount float64)
	StopShort(price, amount float64)
	CancelAllOrder()
	AddIndicator(name string, params ...int) (ind indicator.CommonIndicator)
	Position() (pos, price float64)
	Balance() float64
	Log(v ...interface{})
	Watch(watchType string)
	SendNotify(content, contentType string)
	Merge(src, dst string, fn common.CandleFn)
	SetBalance(balance float64)

	// call for goscript
	UpdatePosition(pos, price float64)
	OnCandle(candle trademodel.Candle)
	UpdateBalance(balance float64)
}