Advanced CDK Patterns in AWS Serverless

Reusable Constructs

Reusable constructs are custom CDK components that encapsulate AWS resources and configurations. They promote DRY (Don't Repeat Yourself) principles in your infrastructure code.

Stack and Stage Patterns

Stacks are the smallest unit of deployment in AWS CDK. Staging allows for configurations that can be separated by environments (e.g., development, staging, production).

Event-Driven Architecture

Event-driven architecture enables communication between services using events rather than direct calls, improving decoupling and scalability.

Step 1: Setting Up Your CDK Project

mkdir my-serverless-app
cd my-serverless-app
cdk init app --language=typescript

Step 2: Defining the Lambda Function

import * as cdk from 'aws-cdk-lib';
import { Construct } from 'constructs';
import * as lambda from 'aws-cdk-lib/aws-lambda';
import * as apiGateway from 'aws-cdk-lib/aws-apigateway';
import * as dynamodb from 'aws-cdk-lib/aws-dynamodb';

export class MyServerlessStack extends cdk.Stack {
    constructor(scope: Construct, id: string, props?: cdk.StackProps) {
        super(scope, id, props);

        const table = new dynamodb.Table(this, 'MyTable', {
            partitionKey: { name: 'id', type: dynamodb.AttributeType.STRING },
        });

        const lambdaFunction = new lambda.Function(this, 'MyFunction', {
            runtime: lambda.Runtime.NODEJS_14_X,
            handler: 'lambda.handler',
            code: lambda.Code.fromAsset('lambda'),
        });

        const api = new apiGateway.LambdaRestApi(this, 'MyApi', {
            handler: lambdaFunction,
        });

        table.grantReadWriteData(lambdaFunction);
    }
}

Step 3: Deploying the Stack

cdk deploy