Book Image

AWS CDK in Practice

By : Mark Avdi, Leo Lam
Book Image

AWS CDK in Practice

By: Mark Avdi, Leo Lam

Overview of this book

As cloud applications are becoming more complex, multiple tools and services have emerged to cater to the challenges of running reliable solutions. Although infrastructure as code, containers, and orchestration tools, such as Kubernetes, have proved to be efficient in solving these challenges, AWS CDK represents a paradigm shift in building easily developed, extended, and maintained applications. With AWS CDK in Practice, you’ll start by setting up basic day-to-day infrastructure while understanding the new prospects that CDK offers. You’ll learn how to set up pipelines for building CDK applications on the cloud that are long-lasting, agile, and maintainable. You’ll also gain practical knowledge of container-based and serverless application development. Furthermore, you’ll discover how to leverage AWS CDK to build cloud solutions using code instead of configuration files. Finally, you’ll explore current community best practices for solving production issues when dealing with CDK applications. By the end of this book, you’ll have practical knowledge of CDK, and you’ll be able to leverage the power of AWS with code that is simple to write and maintain using AWS CDK.
Table of Contents (17 chapters)
Part 1: An Introduction to AWS CDK
Part 2: Practical Cloud Development with AWS CDK
Part 3: Serverless Development with AWS CDK
Part 4: Advanced Architectural Concepts

Running Lambda application logic locally

You might have noticed that since we changed the infrastructure code to serverless, we haven’t touched the server’s folder code. You might be wondering if we are still going to use it. The answer is yes: we are going to use it for local development in the same way we were using it when we had RDS, but we will have to make some changes to make it work with DynamoDB. Additionally, we will import the same code that is running inside the deployed Lambda function into the local server and run it in their POST and GET routes. So, let’s get started.

You can find all the code discussed here in the server/src/index.ts file.

The first thing we need to do is import the code used in the Lambda integration of API Gateway for POST and GET endpoints:

import { handler as PostHandler } from '../../infrastructure/lib/constructs/Lambda/post/lambda';
import { handler as GetHandler } from '../../infrastructure/lib/constructs...