feat：商品增减库存

src/Goods/Lib/GoodsInterface.php

@@ -28,6 +28,8 @@ use Swoft\Core\ResultInterface;
  * @method ResultInterface deferGetReturnVisitByGoodsIds($storeId, $goodsIds)
  * @method ResultInterface deferCountEvaluate($storeId, $time)
  * @method ResultInterface deferFind($storeId, $id)
+ * @method ResultInterface deferReduceStock($storeId, $goodsId, $num, $skuId)
+ * @method ResultInterface deferAddStock($storeId, $goodsId, $num, $skuId)
  * Interface GoodsInterface
  * @package Hdll\Services\Goods\Lib
  */
@@ -186,4 +188,23 @@ interface GoodsInterface
 	 * @return array|mixed
 	 */
 	public function find($storeId, $id);
+
+
+	/**
+	 * 减少库存
+	 * @param $storeId
+	 * @param $goodsId
+	 * @param $num
+	 * @param $skuId
+	 */
+	public function reduceStock($storeId, $goodsId, $num, $skuId);
+
+	/**
+	 * 增加库存
+	 * @param $storeId
+	 * @param $goodsId
+	 * @param $num
+	 * @param $skuId
+	 */
+	public function addStock($storeId, $goodsId, $num, $skuId);
 }