Implement order system.

orders.go

@@ -0,0 +1,64 @@
+
+package main
+
+const (
+	LIMIT_ORDER = iota
+	MARKET_ORDER
+)
+
+var Orders []*Order
+
+type Order struct {
+	OrderID int
+	Exchange string
+	Type int
+	Amount float64
+	Price float64
+}
+
+func NewOrder(Exchange string, amount, price float64) (int) {
+	order := &Order{}
+	if  (len(Orders) == 0) {
+		order.OrderID = 0
+	} else {
+		order.OrderID = len(Orders)
+	}
+
+	order.Exchange = Exchange
+	order.Amount = amount
+	order.Price = price
+	Orders = append(Orders, order)
+	return order.OrderID
+}
+
+func DeleteOrder(orderID int) (bool) {
+	for i := range Orders {
+		if Orders[i].OrderID == orderID {
+			Orders = append(Orders[:i], Orders[i+1:]...)
+			return true
+		}
+	}
+	return false
+}
+
+func GetOrdersByExchange(exchange string) ([]*Order, bool) {
+	orders := []*Order{}
+	for i := range Orders {
+		if Orders[i].Exchange == exchange {
+			orders = append(orders, Orders[i])
+		}
+	}
+	if len(orders) > 0 {
+		return orders, true
+	}
+	return nil, false
+}
+
+func GetOrderByOrderID(orderID int) (*Order, bool) {
+	for i := range Orders {
+		if Orders[i].OrderID == orderID {
+			return Orders[i], true
+		}
+	}
+	return nil, false
+}