Setup API Gateway WebSocket API with CDK

Setup API Gateway WebSocket API with CDK

Setup API Gateway WebSocket API with CDK - Setting up API Gateway with set up Websocket support. I still need to add an additional route to my WebSocket APIs that will handle adding todos. This is very easy with CDK.

This is the first part in a series of posts in which I am going to describe the steps to build a TODO list that allows real-time cooperation. This can be useful if you want to share some tasks with friends and observe the progress in real time.

In this post I’m going to describe the backend part which will consist of:

  • setting up API Gateway with WebSocket support
  • managing connected clients with Lambda and DynamoDB
  • receiving a message and broadcasting it to all connected clients

The infrastructure will be codified with CDK. Let’s get started!

Infrastructure

Setting up API Gateway is pretty straightforward. Using the  WebSocketApi construct we just need to specify the lambda handlers responsible for handling clients connecting and disconnecting.

const webSocketApi = new WebSocketApi(this, 'TodosWebsocketApi', {
  connectRouteOptions: { integration: new LambdaWebSocketIntegration({ handler: connectHandler }) },
  disconnectRouteOptions: { integration: new LambdaWebSocketIntegration({ handler: disconnetHandler }) },
});

api-gateway aws javascript web-development programming

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