Game Scheduler is a full-stack web application bootstrapped with create-react-app and AWS Amplify. I took up this project to familiarize myself with distributed systems and AWS technologies such as dynamodb, lambda, simple notification service, simple email service, event bridge, cloud watch events, graphQL, etc.
The application allows a user to create a poll to schedule a date, time and buy in amount for a poker game.
A user can create a poll, copy a shareable link and send it to other users to vote (who can optionally provide an email for notifications). After voting is finished the creator must "close" the poll.
Closing a poll will:
- Send email notifications to voters about the date, time and buy in amount of the game (based on votes).
- Create a scheduled Cloud Watch Rule that will execute on the day of the game. The rule will trigger a Lambda function that sends an email notification to anyone who provided an e-mail.
Tech stack: AWS DynamoDB, Cognito, Lambda (functions and layers), Simple notification service, Simple email service, Cloud watch events, GraphQL, AppSync, React and Typescript.
The code for the back-end services is located in the amplify folder. Lambda functions are in the amplify/backend/function folder. The bulk of the code for a given lambda is in amplify/backend/function/{SOME_LAMBDA_FN}/src/index.js. A lambda layer exists to share code across the lambdas.
Example: A lambda that is triggered by a DynamoDB stream and creates a cloud watch event rule amplify/backend/function/EmailReminderCron/src/index.js
The front-end code is located in the src folder.
Development Status: Aside from SQS and the SQS lambda processor, everything has been developed.