Kotlin DynamoDB Example

This app provides a basic proof of concept for working with DynamoDB using Kotlin.

Technologies

• Kotlin
• DynamoDB
• Jooby
• Netty

Dependencies & Useful Tools

• AWS CLI for sample data initialization
• NoSQL Workbench for visualization of the model and sample data
• jq for pretty JSON

Getting Started

Running Locally

• Start DynamoDB local via Docker
  • docker run -p 8000:8000 amazon/dynamodb-local -jar DynamoDBLocal.jar -sharedDb -inMemory
    • be sure to include the sharedDb flag to easily interact with the sample data using the sample app, AWS cli, and NoSQL Workbench
    • including the inMemory flag ensures that the DB will not be persisted to disk. Useful for tests and tweaking the model, but may not be ideal for playing with the app itself.
  • Or use the provided docker-compose.yml (currently only contains DynamoDB dependency)
• Run script to initialize DB and create sample data
  • ./data/init_db.sh
• Start the App
  • ./gradlew joobyRun
• Query the API!

Sample Requests

• Retrieve a Roaster by ID
  • curl 'http://localhost:8080/roasters/counter-culture-coffee' -H 'accept: application/json' | jq
• Retrieve Offerings by Roaster ID
  • curl 'http://localhost:8080/roasters/little-wolf-coffee/offerings' -H 'accept: application/json' | jq
• Retrieve Offerings by Origin, Roaster
  • curl 'http://localhost:8080/offerings?origin_name=ecuador' -H 'accept: application/json' | jq
  • curl 'http://localhost:8080/offerings?origin_name=ecuador&roaster_id=counter-culture-coffee' -H 'accept: application/json' | jq
• Create a Roaster
  • curl 'http://localhost:8080/roasters' -X POST -d '{ "name": "New Roaster", "url": "https://www.newroaster.com", "status": "active" }' -H 'Accept: application/json' -H 'Content-Type: application/json' | jq
• Update a Roaster
  • curl 'http://localhost:8080/roasters/new-roaster' -X PUT -d '{ "name": "New Roaster Coffee", "url": "https://www.newroaster.coffee", "status": "test" }' -H 'Accept: application/json' -H 'Content-Type: application/json' | jq
  • curl 'http://localhost:8080/roasters/new-roaster' -X PUT -d '{ "status": "disabled" }' -H 'Accept: application/json' -H 'Content-Type: application/json' | jq
• Delete a Roaster
  • curl 'http://localhost:8080/roasters/new-roaster' -X DELETE -H 'Accept: application/json' -H 'Content-Type: application/json' | jq

About the Data Model

Coming soon!

TODOs/Shortcomings to Document

• Document code
• Refactor/code cleanup
• More refactoring. Actually structure the code.
• Tests that don't rely on sample data
• SO MANY BAD USES OF !! :(
• Complete docker-compose.yml to include app build
• Is there a way to model the full roaster into the offerings by origin GSI without embedding it?
• Offering model price is oversimplified. Also missing quantity.
• Lack of validation