91 lines
3.4 KiB
C#
91 lines
3.4 KiB
C#
using MediatR;
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using Microsoft.Extensions.Logging;
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using TakeoutSaaS.Application.App.Inventory.Commands;
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using TakeoutSaaS.Application.App.Inventory.Dto;
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using TakeoutSaaS.Domain.Inventory.Repositories;
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using TakeoutSaaS.Shared.Abstractions.Constants;
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using TakeoutSaaS.Shared.Abstractions.Exceptions;
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namespace TakeoutSaaS.Application.App.Inventory.Handlers;
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/// <summary>
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/// 库存锁定处理器。
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/// </summary>
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public sealed class LockInventoryCommandHandler(
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IInventoryRepository inventoryRepository,
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ILogger<LockInventoryCommandHandler> logger)
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: IRequestHandler<LockInventoryCommand, InventoryItemDto>
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{
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/// <inheritdoc />
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public async Task<InventoryItemDto> Handle(LockInventoryCommand request, CancellationToken cancellationToken)
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{
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// 1. 读取库存
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var item = await inventoryRepository.GetForUpdateAsync(null, request.StoreId, request.ProductSkuId, cancellationToken);
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if (item is null)
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{
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throw new BusinessException(ErrorCodes.NotFound, "库存不存在");
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}
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var tenantId = item.TenantId;
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// 1.1 幂等处理
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var existingLock = await inventoryRepository.FindLockByKeyAsync(tenantId, request.IdempotencyKey, cancellationToken);
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if (existingLock is not null)
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{
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return InventoryMapping.ToDto(item);
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}
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// 2. 校验可用量
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var now = DateTime.UtcNow;
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var isPresale = request.IsPresaleOrder || item.IsPresale;
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if (isPresale)
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{
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if (item.PresaleStartTime.HasValue && now < item.PresaleStartTime.Value)
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{
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throw new BusinessException(ErrorCodes.Conflict, "预售尚未开始");
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}
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if (item.PresaleEndTime.HasValue && now > item.PresaleEndTime.Value)
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{
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throw new BusinessException(ErrorCodes.Conflict, "预售已结束");
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}
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}
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var available = isPresale
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? (item.PresaleCapacity ?? item.QuantityOnHand) - item.PresaleLocked
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: item.QuantityOnHand - item.QuantityReserved;
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if (available < request.Quantity)
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{
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throw new BusinessException(ErrorCodes.Conflict, "库存不足，无法锁定");
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}
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// 3. 执行锁定
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if (isPresale)
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{
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item.PresaleLocked += request.Quantity;
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}
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else
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{
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item.QuantityReserved += request.Quantity;
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}
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item.IsSoldOut = item.QuantityOnHand - item.QuantityReserved - item.PresaleLocked <= (item.SafetyStock ?? 0);
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await inventoryRepository.UpdateItemAsync(item, cancellationToken);
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var lockRecord = new Domain.Inventory.Entities.InventoryLockRecord
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{
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TenantId = tenantId,
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StoreId = request.StoreId,
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ProductSkuId = request.ProductSkuId,
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Quantity = request.Quantity,
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IsPresale = isPresale,
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IdempotencyKey = request.IdempotencyKey,
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ExpiresAt = request.ExpiresAt,
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Status = Domain.Inventory.Enums.InventoryLockStatus.Locked
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};
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await inventoryRepository.AddLockAsync(lockRecord, cancellationToken);
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await inventoryRepository.SaveChangesAsync(cancellationToken);
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logger.LogInformation("锁定库存 门店 {StoreId} SKU {ProductSkuId} 数量 {Quantity}", request.StoreId, request.ProductSkuId, request.Quantity);
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return InventoryMapping.ToDto(item);
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}
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}
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