CDK TypeScript Demo

This is project with study purposes, fell free to comment and use it in your own test cases!

Uses TypeScript development with CDK.

The cdk.json file tells the CDK Toolkit how to execute your app.

Please follow the AWS CDK Instructions and setup your local environmeant with a valid AWS credential and account.

Useful commands

• yarn build Build project
• yarn test Run tests within this app
• yarn deploy Build and deploy your services
• cdk synth Generates Cloudformation files

Infraestructure

When you run yarn deploy the app will deploy the following services with the described vinculations:

---

Amplify

Amplify is used just to create a simple frontend linked with our Appsync API. In this example I'm using a personal React demo that can communicate with the API using Amplify's interface. TODO: Some configs need to be updated at user-demo so this actually works

---

AppSync

Describes a simple API for the following entity:

type User {
    id: String!
    name: String!
    password: String!
}

And the following endpoints:

type Mutation {
    addUser(user: SaveUserInput!): User 
    deleteUser(id: String!): User
}

type Query {
    getUser(id: String!): User
    getUsers: [User]
}

The data is persisted at DynamoDB table.

---

DynamoDB

DynamoDB with Dynamo Streams on. For each data modified it will trigger a lambda with a event and context to be processed.

The Table is a simple table that stores User's

Lambda

Triggered by DynamoDB it will send multiple messages in a SNS topic and it also has a SQS DLQ in case of failures.

SNS and SQS

As noted, they're both binded to the Lambda service, you can set the SNS to deliver a email for you and test the whole process!