update stuff

cart-grain.go

@@ -235,6 +235,19 @@ func (c *CartGrain) HandleMessage(message *Message, isReplay bool) (*FrameWithPa
 	grainMutations.Inc()
 	var err error
 	switch message.Type {
+	case SetCartItemsType:
+		msg, ok := message.Content.(*messages.SetCartItems)
+		if !ok {
+			err = fmt.Errorf("expected SetCartItems")
+		} else {
+			c.mu.Lock()
+			c.Items = make([]*CartItem, 0, len(msg.Items))
+			c.mu.Unlock()
+			for _, item := range msg.Items {
+				c.AddItem(item.Sku, int(item.Quantity))
+			}
+
+		}
 	case AddRequestType:
 		msg, ok := message.Content.(*messages.AddRequest)
 		if !ok {