public Task EmptyCartAsync(string userId)
{
Console.WriteLine($"EmptyCartAsync called with userId={userId}");
userCartItems[userId] = new Hipstershop.Cart();
return(Task.CompletedTask);
}
public async Task AddItemAsync(string userId, string productId, int quantity)
{
Console.WriteLine($"AddItemAsync called with userId={userId}, productId={productId}, quantity={quantity}");
EnsureRedisConnected();
var db = redis.GetDatabase();
var value = await db.HashGetAsync(userId, CART_FIELD_NAME);
Hipstershop.Cart cart;
if (value.IsNull)
{
cart = new Hipstershop.Cart();
cart.UserId = userId;
cart.Items.Add(new Hipstershop.CartItem {
ProductId = productId, Quantity = quantity
});
}
else
{
cart = JsonSerializer.Deserialize <Hipstershop.Cart>(value);
var existingItem = cart.Items.SingleOrDefault(i => i.ProductId == productId);
if (existingItem == null)
{
cart.Items.Add(new Hipstershop.CartItem {
ProductId = productId, Quantity = quantity
});
}
else
{
existingItem.Quantity += quantity;
}
}
await db.HashSetAsync(userId, new[] { new HashEntry(CART_FIELD_NAME, JsonSerializer.Serialize(cart)) });
}
public Task AddItemAsync(string userId, string productId, int quantity)
{
Console.WriteLine($"AddItemAsync called with userId={userId}, productId={productId}, quantity={quantity}");
var newCart = new Hipstershop.Cart
{
UserId = userId,
Items = { new Hipstershop.CartItem {
ProductId = productId, Quantity = quantity
} }
};
userCartItems.AddOrUpdate(userId, newCart,
(k, exVal) =>
{
// If the item exists, we update its quantity
var existingItem = exVal.Items.SingleOrDefault(item => item.ProductId == productId);
if (existingItem != null)
{
existingItem.Quantity += quantity;
}
else
{
exVal.Items.Add(new Hipstershop.CartItem {
ProductId = productId, Quantity = quantity
});
}
return(exVal);
});
return(Task.CompletedTask);
}
private static byte[] ToByteArray(Hipstershop.Cart cart)
{
if (cart == null)
{
return(null);
}
return(cart.ToByteArray());
}
public Task <Hipstershop.Cart> GetCartAsync(string userId)
{
Console.WriteLine($"GetCartAsync called with userId={userId}");
Hipstershop.Cart cart = null;
if (!userCartItems.TryGetValue(userId, out cart))
{
Console.WriteLine($"No carts for user {userId}");
return(Task.FromResult(emptyCart));
}
return(Task.FromResult(cart));
}
public async Task EmptyCartAsync(string userId)
{
Console.WriteLine($"EmptyCartAsync called with userId={userId}");
try
{
var cart = new Hipstershop.Cart();
await _cache.SetAsync(userId, cart.ToByteArray());
}
catch (Exception ex)
{
throw new RpcException(new Status(StatusCode.FailedPrecondition, $"Can't access cart storage. {ex}"));
}
}
public RedisCartStore(string redisAddress)
{
// Serialize empty cart into byte array.
var cart = new Hipstershop.Cart();
emptyCartBytes = cart.ToByteArray();
connectionString = $"{redisAddress},ssl=false,allowAdmin=true,connectRetry=5";
redisConnectionOptions = ConfigurationOptions.Parse(connectionString);
// Try to reconnect if first retry failed (up to 5 times with exponential backoff)
redisConnectionOptions.ConnectRetry = REDIS_RETRY_NUM;
redisConnectionOptions.ReconnectRetryPolicy = new ExponentialRetry(100);
redisConnectionOptions.KeepAlive = 180;
}
public async Task AddItemAsync(string userId, string productId, int quantity)
{
Console.WriteLine($"AddItemAsync called with userId={userId}, productId={productId}, quantity={quantity}");
try
{
EnsureRedisConnected();
var db = redis.GetDatabase();
// Access the cart from the cache
var value = await db.HashGetAsync(userId, CART_FIELD_NAME);
Hipstershop.Cart cart;
if (value.IsNull)
{
cart = new Hipstershop.Cart();
cart.UserId = userId;
cart.Items.Add(new Hipstershop.CartItem {
ProductId = productId, Quantity = quantity
});
}
else
{
cart = Hipstershop.Cart.Parser.ParseFrom(value);
var existingItem = cart.Items.SingleOrDefault(i => i.ProductId == productId);
if (existingItem == null)
{
cart.Items.Add(new Hipstershop.CartItem {
ProductId = productId, Quantity = quantity
});
}
else
{
existingItem.Quantity += quantity;
}
}
await db.HashSetAsync(userId, new[] { new HashEntry(CART_FIELD_NAME, ToByteArray(cart)) });
}
catch (Exception ex)
{
throw new RpcException(new Grpc.Core.Status(StatusCode.FailedPrecondition, $"Can't access cart storage. {ex}"));
}
}
public async Task AddItemAsync(string userId, string productId, int quantity)
{
Console.WriteLine($"AddItemAsync called with userId={userId}, productId={productId}, quantity={quantity}");
try
{
Hipstershop.Cart cart;
var value = await _cache.GetAsync(userId);
if (value == null)
{
cart = new Hipstershop.Cart();
cart.UserId = userId;
cart.Items.Add(new Hipstershop.CartItem {
ProductId = productId, Quantity = quantity
});
}
else
{
cart = Hipstershop.Cart.Parser.ParseFrom(value);
var existingItem = cart.Items.SingleOrDefault(i => i.ProductId == productId);
if (existingItem == null)
{
cart.Items.Add(new Hipstershop.CartItem {
ProductId = productId, Quantity = quantity
});
}
else
{
existingItem.Quantity += quantity;
}
}
await _cache.SetAsync(userId, cart.ToByteArray());
}
catch (Exception ex)
{
throw new RpcException(new Status(StatusCode.FailedPrecondition, $"Can't access cart storage. {ex}"));
}
}
