NestJS 流文件技术不起作用

Question

我正在尝试使用 NestJS Streaming Files technique 流式传输 CSV 文件，但请求似乎被卡住了。我在这里遗漏了什么吗？

示例代码片段：

import {StreamableFile} from '@nestjs/common';
import * as fs from 'fs';

@Get('csv')
csvStream(
  @Req() req: Request,
  @Res() res: Response,
): StreamableFile {
  const file = 'test.csv';
  const readStream = fs.createReadStream(file);
  readStream.on('data', (chunk) => console.log(chunk));  <--- the data log gets printed
  readStream.on('finish', () => console.log('done'));
  return new StreamableFile(readStream);
}

打印数据日志（检查语句-readStream.on('data', (chunk) => console.log(chunk))），输出类似如下：

<Buffer 23 4a 45 67 11 97 ... 1022 more bytes>

请求停留在这个状态。

Answer 1

以下为我工作，在本地...

import { Controller, Get, Req, Response, StreamableFile } from '@nestjs/common';
import * as fs from 'fs';
import * as path from 'path';

@Controller()
export class FileController {
    @Get('csv')
    csvStream(@Req() req, @Response({ passthrough: true }) res): StreamableFile {
        res.set({
            'Content-Type': 'text/plain'
        });

        const file = path.join(__dirname, 'test.csv');
        const readStream = fs.createReadStream(file);
        readStream.on('data', (chunk) => console.log(chunk)); // <--- the data log gets printed
        readStream.on('end', () => console.log('done'));
        readStream.on('error', (err) => { console.error(err); });

        return new StreamableFile(readStream);
    }
}

请注意{ passthrough: true }。这就是让我得到回应的原因，所以看起来很重要！！！

NestJS 流文件技术不起作用

NestJS Streaming Files technique not working

typescript

rest

csv

streaming

nestjs