AWS Lambda :: How to test my code on my local ubuntu machine? - node.js

Question

I have this Lambda function code which is invoked by an SQS.
SQS triggers my Lambda function ( in nodeJS).
Lambda will also send out an SES email. Is there a way I can test this on my local Ubuntu rather than always using AWS web console?
Any help is appreciated.
Here is my Lambda NodeJS code: This code works only on AWS Lambda. When I run
$node index.js , it does not send out SES email.
var aws = require("aws-sdk");
var nodemailer = require("nodemailer");
aws.config.loadFromPath('aws_config.json');
var ses = new aws.SES();
var s3 = new aws.S3();
// Set the region
aws.config.update({region: 'us-west-2'});
exports.handler = function (event, context, callback) {
const response = {
statusCode: 200,
body: JSON.stringify({
message: 'SQS event processed.',
input: event,
}),
};
console.log('event: ', JSON.stringify(event.Records));
result = JSON.stringify(event.Records)
result = result.replace(/(^\[)/, '');
result = result.replace(/(\]$)/, '');
var resultObj = JSON.parse(result);
var idCustomer = resultObj.body;
console.log('===SENDING EMAIL====');
// Create sendEmail paramssd
var params = {
Destination: {
/* required */
CcAddresses: [
'XXXXX#gmail.com',
/* more items */
]
},
Message: {
/* required s*/
Body: {
/* required */
Html: {
Charset: "UTF-8",
Data: "BODY:"
},
Text: {
Charset: "UTF-8",
Data: "TEXT_FORMAT_BODY"
}
},
Subject: {
Charset: 'UTF-8',
Data: idCustomer
}
},
Source: 'xxxx#eeeee.com', /* required */
ReplyToAddresses: [
'wwwwww#wwwwwwwww.com',
/* more items */
],
};
// Create the promise and SES service object
var sendPromise = new aws.SES({apiVersion: '2010-12-01'}).sendEmail(params).promise();
// Handle promise's fulfilled/rejected states s
sendPromise.then(
function (data) {
console.log("Successfully sent using SES");
console.log(data.MessageId);
}).catch(
function (err) {
console.log("An Error occured while senting using using SES");
console.error(err, err.stack);
});
};

Answer 1

You should definetely take a look at SAM LOCAL. It is a tool developed by the AWS team specifically for testing lambdas.
https://github.com/awslabs/aws-sam-cli
Publishes a version of your function from the current snapshot of
$LATEST. That is, AWS Lambda takes a snapshot of the function code and
configuration information from $LATEST and publishes a new version.
The code and configuration cannot be modified after publication. For
information about the versioning feature, see
It is easy to use, you just type
sam local invoke --event event.json
And behind the scenes it will run a docker cotnainer for your lambda and call it.
Regarding your SES, you should put a small if(SAM_LOCAL) condition in the code and call the real one only if not in local mode. Note that SAM_LOCAL is env variable set by the SAM LOCAL tool when you run a function locally.
Good luck !

Answer 2

If you want to use aws as a backend - serverless framework is probably what you looking for https://serverless.com/ If you want to test your code without executing lambda on aws backend take a look at localastack framework https://github.com/localstack/localstack