How to add and execute my own lambda function within the serverless-framework?

Question

How do I add my own lambda without going to AWS console manually and, most importantly, how do I call it from my React app?

Currently, if I want to execute my own lambda function, I go to AWS console and create it there manually. Clearly, there is a way to do this locally in VS Code, since serverless-framework has created its functions already using the fullstack-app deployment.

This is my current Lambda function (send an email from contact form using Amazon SES) created in AWS using console.

var aws = require('aws-sdk');
var ses = new aws.SES({region: 'us-east-1'});
exports.handler = (event, context, callback) => {
    
     var params = {
        Destination: {
            ToAddresses: [`${event.toEmail}`]
        },
        Message: {
            Body: {Html: { Data: `${event.body}`}
            },
            Subject: { Data: `${event.subject}`}
        },
        Source: `${event.fromEmail}`
    };

     ses.sendEmail(params, function (err, data) {
        callback(null, {err: err, data: data});
        if (err) {
            console.log(err);
            context.fail(err);
        } else {
            console.log(data);
            context.succeed(event);
        }
    });
};

I have created a REST API for it in AWS and I call it from my React app with axios:

  axios.post(`https://xxxxxxxx.execute-api.us-east-1.amazonaws.com/default/contactFormSend`, email)
  .then(res => {console.log(res)})

My goal is to not create the lambda function manually in AWS console, but write it locally using serverless-framework architecture and find a way to call it.

I have looked everywhere, but I feel like I have missed something very important during my learning about serverless-framework architecture.

Traycho Ivanov Traycho Ivanov · Accepted Answer · 2020-09-23T12:33:03

How do I add my own lambda without going to AWS console manually and, most importantly ?

I hope you have serverless.yml file with your function config. Here is a template with possible configs https://www.serverless.com/framework/docs/providers/aws/guide/serverless.yml/

If everything is setup deploying is super easy , just by using serverless deploy

https://www.serverless.com/framework/docs/providers/aws/guide/deploying/

Here is a very simple one from serverless examples - https://github.com/serverless/examples/tree/master/aws-node-rest-api

How do I call it from my React app ?

You need an exposed public endpoint either you take directly the one generated by API Gateway or you create custom domain and map it to your existing domain.

How to add and execute my own lambda function within the serverless-framework?

1 Answers