Cannot upload to AWS S3 inside my Lambda function - node.js

Question

I have the following lambda function. It received an XML, looks through it, finds a base64 pdf file and tries to upload it to S3.
index.js
const AWS = require('aws-sdk');
const xml2js = require('xml2js');
const pdfUpload = require('./upload_pdf');
const s3 = new AWS.S3();
exports.handler = async (event, context, callback) => {
let attachment;
xml2js.parseString(event.body, function(err, result) {
attachment =
result.Attachment[0].Data[0];
if (attachment) {
pdfUpload(attachment);
}
});
return {
statusCode: 200
}
};
upload_pdf.js
/**
*
* #param {string} base64 Data
* #return {string} Image url
*/
const pdfUpload = async (base64) => {
const AWS = require('aws-sdk');
const s3 = new AWS.S3();
const base64Data = new Buffer.from(base64, 'base64');
// With this setup, each time your user uploads an image, will be overwritten.
// To prevent this, use a different Key each time.
// This won't be needed if they're uploading their avatar, hence the filename, userAvatar.js.
const params = {
Bucket: 'mu-bucket',
Key: `123.pdf`,
Body: base64Data,
ACL: 'public-read',
ContentEncoding: 'base64',
ContentType: `application/pdf`
}
let location = '';
let key = '';
try {
const { Location, Key } = await s3.upload(params).promise();
location = Location;
key = Key;
} catch (error) {
// console.log(error)
}
console.log(location, key);
return location;
}
module.exports = pdfUpload;
No matter what I do, the file does not get uploaded. I have checked the permissions, and the lambda has access to the bucket. Running the lambda I'm not receiving any errors either. Can anybody see what might be wrong here?

Answer 1

First, as an advice, I think you should put more logs to see at which steps the function is stuck / failing
The second thing you can try is to put await
await pdfUpload(attachment);