Simple CRUD application to manage books

This projects uses an APIGateway with CORS enabled, pointing to five Lambdas executing CRUD operations on a single DynamoDB table.

Build

To build this app, you need to be in this example's root folder. Then run the following:

npm install -g aws-cdk
npm install
npm run build

This will install the necessary CDK, then this example's dependencies, then the lambda functions' dependencies, and then build your TypeScript files and your CloudFormation template.

Solution

Deploy

Run cdk deploy. This will deploy / redeploy your Stack to your AWS Account.

After the deployment you will see the API's URL, which represents the url you can then use.

The Component Structure

The whole component contains:

• An API, with CORS enabled on all HTTTP Methods. (Use with caution, for production apps you will want to enable only a certain domain origin to be able to query your API.)
• Lambda pointing to src/create_book.py, containing code for storing a book into the DynamoDB table.
• Lambda pointing to src/delete_book.py, containing code for deleting books from the DynamoDB table.
• Lambda pointing to src/get_books.py, containing code for getting all books from the DynamoDB table.
• Lambda pointing to src/get_book.py, containing code for getting a book from the DynamoDB table.
• Lambda pointing to src/update_book.py, containing code for updating a book in the DynamoDB table.
• A DynamoDB table books that stores the data.
• Five LambdaIntegrations that connect these Lambdas to the API.

Caveats

• The Countries and Languages properties cannot have values stored in an array.
• REST API is not documented in API Gateway.
• No tests are written.

Useful commands

• npm run build compile typescript to js
• npm run watch watch for changes and compile
• npm run test perform the jest unit tests
• cdk deploy deploy this stack to your default AWS account/region
• cdk diff compare deployed stack with current state
• cdk synth emits the synthesized CloudFormation template