AWS Serverless CRUD API POC

Managed, built & deployed through AWS SAM

Services

• Amazon API Gateway: proxies incoming request to the corresponding Lambda function, as an AWS_PROXY integration. Integrates with Amazon Cognito for Authorization. Features an API Usage Plan for API Quota & Throttling and API Key for Client access.
• AWS Lambda: each Lambda function handles a specific event: create, get, update, delete, search (by book author, title or category) and auth events (signup and login)
• Amazon DynamoDB: models a Book entity, with Author & Title as the primary key (hash key and sort key, respectively). Item-level changes are pushed to a DynamoDB Streams. An Event Source Mapping is established between the streams and a Lambda function that processes the stream and sends notifications to an SNS Topic when:
  • a new book has been published
  • a book went out of stock
  • new formats (hardcover, paperback, audiobook etc.) are available for a book
• Amazon SNS: implements a Pub/Sub pattern for book status changes. The email subscription is automatically created through the SAM template by the stack creation responsible (configurable through parameters).
• Amazon Cognito: provides authentication and authorization mechanisms
• Amazon CloudWatch: monitoring custom metric data sent by the Lambda functions