48 lines
2.0 KiB
C#
48 lines
2.0 KiB
C#
using MAX.Core.DependencyInjection;
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using MAX.Framework.Commons;
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using MAX.Plugins;
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using Microsoft.Extensions.DependencyInjection;
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using MySql.Data.MySqlClient;
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using System.Security.Cryptography;
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using System.Text;
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namespace Store.Modules.CloudProduct.Services;
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/// <summary>跨实例串行化违规上报和商品索引写入，防止下架后被旧批次写回。</summary>
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public class GoodsIndexLock([FromKeyedServices("CloudProduct")] PluginContext context) : ISingletonDependency
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{
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public Task<IAsyncDisposable> AcquireAsync() => AcquireAsync("goods-index:");
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/// <summary>收藏重建、整条文档写入和安全状态更新共用独立锁，防止旧快照覆盖新结论。</summary>
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public virtual Task<IAsyncDisposable> AcquireFavoritesAsync() => AcquireAsync("favorites-index:");
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private async Task<IAsyncDisposable> AcquireAsync(string prefix)
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{
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// 禁用连接池：即使释放锁失败，关闭物理连接也会释放会话锁。
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var settings = new MySqlConnectionStringBuilder(context.Configuration["CloudProductConnection"])
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{
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Pooling = false
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};
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var connection = new MySqlConnection(settings.ConnectionString);
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var name = prefix + Convert.ToHexString(SHA256.HashData(
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Encoding.UTF8.GetBytes(settings.Database)))[..40];
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try
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{
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await connection.OpenAsync();
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using var command = connection.CreateCommand();
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command.CommandText = "SELECT GET_LOCK(@name, 30)";
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command.CommandTimeout = 35;
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command.Parameters.AddWithValue("@name", name);
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var result = await command.ExecuteScalarAsync();
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if (result == null || result == DBNull.Value || Convert.ToInt32(result) != 1)
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throw new AppException("商品索引正在处理，请稍后重试");
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return connection;
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}
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catch
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{
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await connection.DisposeAsync();
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throw;
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}
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}
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}
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