45 lines
1.7 KiB
C#
45 lines
1.7 KiB
C#
using MAX.Framework.Commons;
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using MAX.Framework.Mediation;
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using MediatR;
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using Store.Users.Entities;
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namespace Store.Users.Behaviors;
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/// <summary>锁定积分账户并检查消费额度，不依赖商铺信息。</summary>
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public sealed class AccountConsumptionBehavior<TRequest, TResponse>(
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UnitOfWorkExecutionContext executionContext)
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: IPipelineBehavior<TRequest, TResponse>
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where TRequest : class, IRequest<TResponse>, IAccountConsumptionRequest
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{
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public async Task<TResponse> Handle(TRequest request, CancellationToken cancellationToken,
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RequestHandlerDelegate<TResponse> next)
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{
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cancellationToken.ThrowIfCancellationRequested();
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if (string.IsNullOrWhiteSpace(request.UserName))
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throw new AppException("用户名不能为空");
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var userName = request.UserName.Trim();
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var user = await executionContext.Orm.Select<UserEntity>().Where(a => a.UserName == userName)
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.ForUpdate().FirstAsync(cancellationToken)
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?? throw new AppException("不存在的用户");
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var quote = request.CalculateConsumption(user);
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if (quote.Amount <= 0 || quote.UnitPrice <= 0)
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throw new AppException("消费金额必须大于0");
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if (user.Points < quote.Amount)
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throw new AppException("余额不足");
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lock (request)
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{
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if (request.ConsumptionContext != null)
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throw new InvalidOperationException("同一个消费命令不能同时执行");
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request.ConsumptionContext = new AccountConsumptionContext(user, quote);
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}
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try
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{
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return await next();
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}
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finally
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{
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request.ConsumptionContext = null;
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}
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}
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}
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