使用 gRPC 实现购物车服务

src/HelloShop.BasketService/Repositories/DistributedCacheBasketRepository.cs

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+// Copyright (c) HelloShop Corporation. All rights reserved.
+// See the license file in the project root for more information.
+
+using HelloShop.BasketService.Entities;
+using Microsoft.Extensions.Caching.Distributed;
+
+namespace HelloShop.BasketService.Repositories
+{
+    public class DistributedCacheBasketRepository(IDistributedCache cache) : IBasketRepository
+    {
+        private const string BasketKeyPrefix = "basket";
+
+        private static string GetBasketKey(int customerId) => $"{BasketKeyPrefix}:{customerId}";
+
+        public async Task DeleteBasketAsync(int customerId, CancellationToken token = default) => await cache.RemoveAsync(GetBasketKey(customerId), token);
+
+        public async Task<CustomerBasket?> GetBasketAsync(int customerId, CancellationToken token = default) => await cache.GetObjectAsync<CustomerBasket>(GetBasketKey(customerId), token);
+
+        public async Task<CustomerBasket?> UpdateBasketAsync(CustomerBasket basket, CancellationToken token = default)
+        {
+            DistributedCacheEntryOptions options = new() { SlidingExpiration = TimeSpan.MaxValue };
+
+            await cache.SetObjectAsync(GetBasketKey(basket.BuyerId), basket, options, token);
+
+            return await GetBasketAsync(basket.BuyerId, token);
+        }
+    }
+}