AWS textract methods in node js are not getting invoked - node.js

Question

I want to extract text from image using node js so created a lambda in aws. Please find the below code snippet. Issue is that the textract method detectDocumentText is not getting invoked.
As far as permission I had given s3 full access and textract full access to the lambda. Am I missing anything?
var AWS = require("aws-sdk");
var base64 = require("base-64");
var fs = require("fs");
exports.handler = async (event, context, callback) => {
// Input for textract can be byte array or S3 object
AWS.config.region = "us-east-1";
//AWS.config.update({ region: 'us-east-1' });
var textract = new AWS.Textract({ apiVersion: "2018-06-27" });
//var textract = new AWS.Textract();
console.log(textract);
var params = {
Document: {
/* required */
//'Bytes': imageBase64
S3Object: {
Bucket: "717577",
Name: "Picture2.png"
}
}
};
textract.detectDocumentText(params, function(err, data) {
if (err) {
console.log(err); // an error occurred
} else {
console.log(data); // successful response
callback(null, data);
}
});
};
As well as I don't see any error logs in cloudwatch logs.

Answer 1

The problem is that you have marked your method as async which means that you are returning a promise. In your case you are not returning a promise so for lambda there is no way to complete the execution of the method. You have two choices here
Remove async
Or more recommended way is to convert your callback style to use promise. aws-sdk support .promise method on all methods so you could leverage that. The code will look like this
var AWS = require("aws-sdk");
var base64 = require("base-64");
var fs = require("fs");
exports.handler = async (event, context) => {
// Input for textract can be byte array or S3 object
AWS.config.region = "us-east-1";
//AWS.config.update({ region: 'us-east-1' });
var textract = new AWS.Textract({ apiVersion: "2018-06-27" });
//var textract = new AWS.Textract();
console.log(textract);
var params = {
Document: {
/* required */
//'Bytes': imageBase64
S3Object: {
Bucket: "717577",
Name: "Picture2.png"
}
}
};
const data = await textract.detectDocumentText(params).promise();
return data;
};
Hope this helps.