feat: 扩展领域模型与配置

src/Infrastructure/TakeoutSaaS.Infrastructure/Common/Persistence/DesignTime/DesignTimeDbContextFactoryBase.cs

@@ -0,0 +1,68 @@
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Design;
+using TakeoutSaaS.Infrastructure.Common.Persistence;
+using TakeoutSaaS.Shared.Abstractions.Security;
+using TakeoutSaaS.Shared.Abstractions.Tenancy;
+
+namespace TakeoutSaaS.Infrastructure.Common.Persistence.DesignTime;
+
+/// <summary>
+/// EF Core 设计时 DbContext 工厂基类，提供统一的连接串与依赖替身。
+/// </summary>
+internal abstract class DesignTimeDbContextFactoryBase<TContext> : IDesignTimeDbContextFactory<TContext>
+    where TContext : TenantAwareDbContext
+{
+    private readonly string _connectionStringEnvVar;
+    private readonly string _defaultDatabase;
+
+    protected DesignTimeDbContextFactoryBase(string connectionStringEnvVar, string defaultDatabase)
+    {
+        _connectionStringEnvVar = connectionStringEnvVar;
+        _defaultDatabase = defaultDatabase;
+    }
+
+    public TContext CreateDbContext(string[] args)
+    {
+        var optionsBuilder = new DbContextOptionsBuilder<TContext>();
+        optionsBuilder.UseNpgsql(
+            ResolveConnectionString(),
+            npgsql =>
+            {
+                npgsql.CommandTimeout(30);
+                npgsql.EnableRetryOnFailure();
+            });
+
+        return CreateContext(
+            optionsBuilder.Options,
+            new DesignTimeTenantProvider(),
+            new DesignTimeCurrentUserAccessor());
+    }
+
+    protected abstract TContext CreateContext(
+        DbContextOptions<TContext> options,
+        ITenantProvider tenantProvider,
+        ICurrentUserAccessor currentUserAccessor);
+
+    private string ResolveConnectionString()
+    {
+        var env = Environment.GetEnvironmentVariable(_connectionStringEnvVar);
+        if (!string.IsNullOrWhiteSpace(env))
+        {
+            return env;
+        }
+
+        return $"Host=localhost;Port=5432;Database={_defaultDatabase};Username=postgres;Password=postgres";
+    }
+
+    private sealed class DesignTimeTenantProvider : ITenantProvider
+    {
+        public Guid GetCurrentTenantId() => Guid.Empty;
+    }
+
+    private sealed class DesignTimeCurrentUserAccessor : ICurrentUserAccessor
+    {
+        public Guid UserId => Guid.Empty;
+        public bool IsAuthenticated => false;
+    }
+}