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import { ExceptionFilter, Catch, ArgumentsHost, HttpException } from '@nestjs/common'
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import { Request, Response } from 'express'
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@Catch(HttpException)
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export class HttpExceptionFilter implements ExceptionFilter {
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  catch(exception: HttpException, host: ArgumentsHost) {
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    const ctx = host.switchToHttp()
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    const response = ctx.getResponse<Response>()
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    const request = ctx.getRequest<Request>()
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    const status = exception.getStatus()
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    response.status(status).json({
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      statusCode: status,
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      message: exception.message,
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      timestamp: new Date().toLocaleString('kr'),
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    })
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  }
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}

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import { ArgumentsHost, Catch, ExceptionFilter, HttpException } from '@nestjs/common'
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@Catch(HttpException)
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export class HttpExceptionFilter implements ExceptionFilter {
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  catch(exception: HttpException, host: ArgumentsHost) {
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    const ctx = host.switchToHttp()
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    const response = ctx.getResponse()
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    const request = ctx.getRequest()
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    const status = exception.getStatus()
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    /**** Filter 전역 설정
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     * 로그 파일을 생성하거나,
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     * 에러 모니터링 시스템에 API 요청하기 기능을 만들고
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     * global하게 쓸 수도 있음(main.ts)
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     */
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    response.status(status).json({
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      statusCode: status,
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      message: exception.message,
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      timestamp: new Date().toLocaleString('kr'),
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      path: request.url,
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    })
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  }
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}

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// posts.controller.ts 생략
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/*** 1) GET /posts
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 * 모든 post를 다 가져온다
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 */
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@Get()
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@UseInterceptors(LogInterceptor)
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@UseFilters(HttpExceptionFilter)
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getPosts(@Query() query: PaginatePostDto) {
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  throw new BadRequestException('에러 테스트')
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  return this.postsService.paginatePosts(query)
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}

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{
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  "statusCode": 400,
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  "message": "에러 테스트",
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  "timestamp": "2024. 1. 7. 오후 5:44:51",
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  "path": "/posts?order__createdAt=DESC&take=5"
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}

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// 생략
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async function bootstrap() {
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  // 생략
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  app.useGlobalFilters(new HttpExceptionFilter()) // 주석 처리
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  await app.listen(3000)
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}
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bootstrap()