Is it possible to use Socket.io with AWS Lambda?

Question

Is it possible to build a function in AWS Lambda that creates a websocket and send data to subscribed applications?

Something like this:

John has the app SuperPh

Answer 1

Yes, you can publish events as a socket.io client to a socket.io server using AWS Lambda.

Steps to implement:

• Create a node app locally, and execute npm install socket.io-client --save in the project folder.
• Implement the handler code in index.js. Here is an example:

exports.handler = async (event) => {
  var io = require('socket.io-client');
  var socket = io.connect("http://example.com:9999");
  let payload = { "id": "1" };
  socket.emit("MyEvent", payload);
  return 'Sent message!';
};

• Create a zip file of the folder.
• In AWS Lambda, Select Upload a .Zip file
• Ensure that after the files are uploaded that the file structure looks similar to:

Project

• node_modules
• index.json
• package-lock.json
• package.json

Save and test.