WebSocket API Gateway + Lambda + DynamoDB

This Terraform code creates a WebSocket API in AWS API Gateway.

Client

1. You can use the client of your choice. Consider using wscat.

Server-side

1. Configure an AWS API gateway endpoint which maintains a WebSocket to the client
2. A Lambda connected to the API gateway endpoint which responds to requests sent to the API gateway
3. A DynamoDB collection which contains a set of random words
   [{ “word”: “car“}, {“word“: “truck“}, {“word“: “banana“}]

Simple workflow

1. Install wscat (npm install -g wscat).
2. Establish a WebSocket connection to the WebSocket API.
   wscat -c wss_api_connection_url
3. Send a message to the API Gateway endpoint (randomword) that triggers the Lambda to read a random word out of the DynamoDB table.
   {"action": "randomword"}
4. The Lambda should return the random word to the API Gateway which should return it to the client which should display it on the screen.