feat(deploy): production deployment setup and fixes

- Debian-based api image (bookworm-slim), docker/debian mirrors, prisma binaryTargets for openssl 3.0 - nginx: admin SPA under /admin, TLS via acme.sh (ZeroSSL) + auto-renewal cron, http->https redirect - prisma: add origin_goods.delisted migration, sync missing schema (good_image/tag_font_color/good_tags), fix users.createdAt Timestamptz - api: CORS wildcard reflection, helmet CORP cross-origin, price backfill in persistProductDetail, categoryIcon ancestor fallback, mediaByColor per-color gallery in public goods detail - admin: /admin base path (vite + router) - import-data.mjs: udt_name casting, serial sequence advance fix
2026-08-26 14:23:09 +08:00
parent be0b90e68f
commit 6c61a4e871
982 changed files with 74156 additions and 179393 deletions
@@ -1,121 +0,0 @@
---
-title: Use Lazy Loading for Large Modules
-impact: MEDIUM
-impactDescription: Improves startup time for large applications
-tags: performance, lazy-loading, modules, optimization
---
-
-## Use Lazy Loading for Large Modules
-
-NestJS supports lazy-loading modules, which defers initialization until first use. This is valuable for large applications where some features are rarely used, serverless deployments where cold start time matters, or when certain modules have heavy initialization costs.
-
-**Incorrect (loading everything eagerly):**
-
-```typescript
-// Load everything eagerly in a large app
-@Module({
-  imports: [
-    UsersModule,
-    OrdersModule,
-    PaymentsModule,
-    ReportsModule, // Heavy, rarely used
-    AnalyticsModule, // Heavy, rarely used
-    AdminModule, // Only admins use this
-    LegacyModule, // Migration module, rarely used
-    BulkImportModule, // Used once a month
-  ],
-})
-export class AppModule {}
-
-// All modules initialize at startup, even if never used
-// Slow cold starts in serverless
-// Memory wasted on unused modules
-```
-
-**Correct (lazy load rarely-used modules):**
-
-```typescript
-// Use LazyModuleLoader for optional modules
-import { LazyModuleLoader } from '@nestjs/core';
-
-@Injectable()
-export class ReportsService {
-  constructor(private lazyModuleLoader: LazyModuleLoader) {}
-
-  async generateReport(type: string): Promise<Report> {
-    // Load module only when needed
-    const { ReportsModule } = await import('./reports/reports.module');
-    const moduleRef = await this.lazyModuleLoader.load(() => ReportsModule);
-
-    const reportsService = moduleRef.get(ReportsGeneratorService);
-    return reportsService.generate(type);
-  }
-}
-
-// Lazy load admin features with caching
-@Injectable()
-export class AdminService {
-  private adminModule: ModuleRef | null = null;
-
-  constructor(private lazyModuleLoader: LazyModuleLoader) {}
-
-  private async getAdminModule(): Promise<ModuleRef> {
-    if (!this.adminModule) {
-      const { AdminModule } = await import('./admin/admin.module');
-      this.adminModule = await this.lazyModuleLoader.load(() => AdminModule);
-    }
-    return this.adminModule;
-  }
-
-  async runAdminTask(task: string): Promise<void> {
-    const moduleRef = await this.getAdminModule();
-    const taskRunner = moduleRef.get(AdminTaskRunner);
-    await taskRunner.run(task);
-  }
-}
-
-// Reusable lazy loader service
-@Injectable()
-export class ModuleLoaderService {
-  private loadedModules = new Map<string, ModuleRef>();
-
-  constructor(private lazyModuleLoader: LazyModuleLoader) {}
-
-  async load<T>(
-    key: string,
-    importFn: () => Promise<{ default: Type<T> } | Type<T>>,
-  ): Promise<ModuleRef> {
-    if (!this.loadedModules.has(key)) {
-      const module = await importFn();
-      const moduleType = 'default' in module ? module.default : module;
-      const moduleRef = await this.lazyModuleLoader.load(() => moduleType);
-      this.loadedModules.set(key, moduleRef);
-    }
-    return this.loadedModules.get(key)!;
-  }
-}
-
-// Preload modules in background after startup
-@Injectable()
-export class ModulePreloader implements OnApplicationBootstrap {
-  constructor(private lazyModuleLoader: LazyModuleLoader) {}
-
-  async onApplicationBootstrap(): Promise<void> {
-    setTimeout(async () => {
-      await this.preloadModule(() => import('./reports/reports.module'));
-    }, 5000); // 5 seconds after startup
-  }
-
-  private async preloadModule(importFn: () => Promise<any>): Promise<void> {
-    try {
-      const module = await importFn();
-      const moduleType = module.default || Object.values(module)[0];
-      await this.lazyModuleLoader.load(() => moduleType);
-    } catch (error) {
-      console.warn('Failed to preload module', error);
-    }
-  }
-}
-```
-
-Reference: [NestJS Lazy Loading Modules](https://docs.nestjs.com/fundamentals/lazy-loading-modules)