130 lines
3.7 KiB
TypeScript
130 lines
3.7 KiB
TypeScript
import { NestFactory } from '@nestjs/core';
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import { ExpressAdapter } from '@nestjs/platform-express';
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import { ValidationPipe } from '@nestjs/common';
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import { DocumentBuilder, SwaggerModule } from '@nestjs/swagger';
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import express from 'express';
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import bodyParser from 'body-parser';
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import * as path from 'path';
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// 缓存 app 实例，避免每次冷启动都重新创建
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let cachedApp: any;
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async function bootstrap() {
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if (!cachedApp) {
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const expressApp = express();
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// 动态解析 dist 目录路径
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// 在 Vercel 环境中，__dirname 是 /var/task/api
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// NestJS 构建后文件在 dist/src 目录下
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const distPath = path.resolve(__dirname, '..', 'dist', 'src', 'app.module');
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console.log('Loading AppModule from:', distPath);
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const { AppModule } = require(distPath);
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const app = await NestFactory.create(
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AppModule,
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new ExpressAdapter(expressApp),
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{ logger: ['error', 'warn', 'log'] },
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);
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// 配置 CORS
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app.enableCors({
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origin: true, // 允许所有来源
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credentials: true,
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methods: ['GET', 'POST', 'PUT', 'DELETE', 'PATCH', 'OPTIONS'],
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allowedHeaders: [
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'Content-Type',
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'Authorization',
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'Accept',
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'Origin',
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'Referer',
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'User-Agent',
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],
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});
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// 尝试加载全局过滤器和拦截器
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try {
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const httpExceptionFilterPath = path.resolve(
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__dirname,
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'..',
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'dist',
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'src',
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'common',
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'filters',
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'http-exception.filter',
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);
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const transformInterceptorPath = path.resolve(
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__dirname,
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'..',
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'dist',
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'src',
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'common',
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'interceptors',
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'transform.interceptor',
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);
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const { HttpExceptionFilter } = require(httpExceptionFilterPath);
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const { TransformInterceptor } = require(transformInterceptorPath);
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app.useGlobalFilters(new HttpExceptionFilter());
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app.useGlobalInterceptors(new TransformInterceptor());
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} catch (error) {
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console.log('Global filters/interceptors not loaded:', error.message);
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}
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// 全局验证管道
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app.useGlobalPipes(
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new ValidationPipe({
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whitelist: true,
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forbidNonWhitelisted: true,
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transform: true,
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}),
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);
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// Body parser 配置
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app.use(bodyParser.json({ limit: '50mb' }));
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app.use(bodyParser.urlencoded({ limit: '50mb', extended: true }));
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// Swagger 文档
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const config = new DocumentBuilder()
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.setTitle('API 文档')
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.setDescription('这是我的应用程序的 API 文档')
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.setVersion('1.0')
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.addBearerAuth()
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.build();
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const document = SwaggerModule.createDocument(app, config);
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// 配置 Swagger UI 使用 CDN 资源（解决 serverless 环境静态资源问题）
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SwaggerModule.setup('docs', app, document, {
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customCssUrl: [
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'https://cdn.jsdelivr.net/npm/swagger-ui-dist@5.11.0/swagger-ui.css',
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],
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customJs: [
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'https://cdn.jsdelivr.net/npm/swagger-ui-dist@5.11.0/swagger-ui-bundle.js',
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'https://cdn.jsdelivr.net/npm/swagger-ui-dist@5.11.0/swagger-ui-standalone-preset.js',
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],
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});
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await app.init();
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cachedApp = expressApp;
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console.log('NestJS app initialized successfully');
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}
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return cachedApp;
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}
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// Vercel Serverless handler
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export default async function handler(req: any, res: any) {
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try {
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console.log(`Request: ${req.method} ${req.url}`);
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const app = await bootstrap();
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app(req, res);
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} catch (error) {
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console.error('Handler error:', error);
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res.status(500).json({
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error: 'Internal Server Error',
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message: error.message,
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stack: process.env.NODE_ENV === 'development' ? error.stack : undefined,
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});
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}
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}
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