How to write a simple lambda function to upload a pdf in Amazon S3?

Question

I'm a new developer in node.js and I want to write a little lambda function (in node.js) that upload a pdf file (from the hard drive) to an Amazon S3 bucket.

Here is my code :

// dependencies
var util = require('util');
var fs = require('fs');

exports.handler = function (req, res) {
    var file = req.files.file;
    fs.readFile("‪C:\\Users\\zack\\Downloads\\test.pdf", function (err, data) {
        if (err) throw err; // Something went wrong!
        var s3bucket = new AWS.S3({params: {Bucket: 'myBucket3'}});
        s3bucket.createBucket(function () {
            var params = {
                Key: file.originalFilename, //file.name doesn't exist as a property
                Body: data
            };
            s3bucket.upload(params, function (err, data) {
                // Whether there is an error or not, delete the temp file
                fs.unlink("‪C:\\Users\\zack\\Downloads\\test.pdf", function (err) {
                    if (err) {
                        console.error(err);
                    }
                    console.log('Temp File Delete');
                });

                console.log("PRINT FILE:", file);
                if (err) {
                    console.log('ERROR MSG: ', err);
                    res.status(500).send(err);
                } else {
                    console.log('Successfully uploaded data');
                    res.status(200).end();
                }
            });
        });
    });
};

The lambda function shows me this error message :

 "errorMessage": "RequestId: 05024c81-f44b-11e6-a45e-57b13036ad96 Process exited before completing request"

And the cloudwatch :

START RequestId: e66a7653-f44b-11e6-8b1a-c511605a533b Version: $LATEST
2017-02-16T13:29:11.133Z    e66a7653-f44b-11e6-8b1a-c511605a533b    TypeError: Cannot read property 'file' of undefined
    at exports.handler (/var/task/invoices3/invoices3.js:17:25)
END RequestId: e66a7653-f44b-11e6-8b1a-c511605a533b
REPORT RequestId: e66a7653-f44b-11e6-8b1a-c511605a533b  Duration: 27.82 ms  Billed Duration: 100 ms     Memory Size: 1024 MB    Max Memory Used: 23 MB  
RequestId: e66a7653-f44b-11e6-8b1a-c511605a533b Process exited before completing request

Can you tell me where is the problem please?? I'm not good at node.js at all.

Thank you in advance !

Mark B · Accepted Answer · 2017-02-16 14:24:36Z

1

Process exited before completing request

You are getting this message because you are never notifying Lambda that the function has completed. You need to either call the context.succeed() function once you are done, or update your code to use the newer callback() method, and call that when you are done.

answered Feb 16, 2017 at 14:24

Mark B

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