javascript - 如何在nodeJs + sequelize+graphql中的s3存储桶上上传之前获取文件大小？

Question

在 s3 存储桶上上传之前验证文件大小。当前使用此代码获取文件大小:

const {
  createReadStream,
  filename
} = await file
const stream = await createReadStream()
let chunk = [];
let conLength;
stream.on('data', data => chunk.push(data))
  .on('end', () => {
    const buffer = Buffer.concat(chunk);
    conLength = buffer.length;
  });
console.log(conLength)
const url = await uploadToS3(stream, filename)
assetRequestUrls.push(url)

但是文件大小在 conLength 变量中获得，仅在函数中使用而不在函数外使用。所以，请帮帮我。

Answer 1

如果你想 console.log 文件大小

const fs = require('fs')

const { size } = fs.statSync(filename)
console.log(size)