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

Question

Validate file size before upload on s3 bucket.currently use this code for get file size:

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)

But file size get in conLength variable that use only in function not used outside function. So, please help me.

Answer 1

If you want to console.log the filesize

const fs = require('fs')

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