Market

- return pnl

market.go

@@ -17,8 +17,8 @@ type Market interface {
 	IsMarketOpened() bool
 	Time() Clock
 
-	Buy(ctx context.Context, symbol string, ratio float64) (Order, error)
-	Sell(ctx context.Context, symbol string, ratio float64) (Order, error)
+	Buy(ctx context.Context, symbol string, ratio float64) (float64, Order, error)
+	Sell(ctx context.Context, symbol string, ratio float64) (float64, Order, error)
 	CancelOrder(id string) error
 
 	Orders() ([]Order, error)