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I'm using node js with aws lambda functions for my web application. I want to use web socket in my web app. And socket.io is a very famous library for node.js.
But I'm not sure how can I use it in aws lambda. can anyone let me know how to do it, is it possible using lambda functions?
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In this application, we'll be creating an AWS Lambda service that accepts the WebSocket connections coming via API Gateway. The connections and subscriptions to topics are persisted using DynamoDB. We will be using ws for implementing basic WebSocket clients for the demonstration.
While AppSync is a fully managed GraphQL API service, it is possible to implement a simple WebSocket API in the service with little or no GraphQL knowledge in minutes thanks to useful tools such as the AWS CDK and AWS Amplify libraries.
Unlike WebSocket, Socket.IO allows you to broadcast a message to all the connected clients.
with AWS Lambda. In addition, you can use AWS Lambda to connect to your Linux instances by using SSH and run desired commands and scripts at regular time intervals.
Can't use socket.io with lambdas. Lambdas have a limit on time it can be executed, so holding open connection with a client is impossible.
What you can do though is use SNS. Lambdas can publish messages to SNS topics and lambdas can be invoked with SNS.
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Workaround exists for this - it's the WebSockets over MQTT in AWS IoT. This way you can execute your Lambda functions from open socket connections.
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