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Hands-On Serverless Applications with Kotlin

By : Trivedi, Kulkarni

Buy this Book

Hands-On Serverless Applications with Kotlin

By: Trivedi, Kulkarni

Buy this Book

Overview of this book

Serverless is a cloud computing execution model where the cloud provider dynamically manages the allocation and provisioning of servers. Many companies now use serverless architectures to cut costs and improve scalability. Thanks to its concise and expressive syntax and a smooth learning curve, Kotlin is a great fit for developing serverless applications. With this book, you’ll be able to put your knowledge to work by implementing serverless technology in your applications and become productive in no time. Complete with detailed explanation of essential concepts and examples, this book will help you understand the serverless architecture fundamentals and how to design serverless architectures for your applications. You’ll also explore how AWS Lambda functions work. The book will guide you in designing, building, securing, and deploying your application to production, along with implementing non-functional requirements such as auditing and logging. Furthermore, you’ll discover how to scale up and orchestrate serverless applications using an open source framework and handle distributed serverless systems in production. By the end of the book, you’ll be able to build scalable and cost-efficient Kotlin applications with a serverless framework.

Preface

Introduction

Who this book is for

What this book covers

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Free Chapter

Basics of Serverless

What is serverless computing?

The evolution of serverless computing

Pros and cons of serverless

The serverless computing ecosystem

Summary

AWS Serverless Offerings

AWS Lambda overview

Summary

Designing a Kotlin Serverless Application

The problem statement

Summary

Developing Your Serverless Application

Preparing the serverless environment

Implementing lambda functions

Implementing other lambda functions in Kotlin

Implementation of the app

Integrating the API

Summary

Improving Your App with Firebase Service

About Firebase

Firebase authentication

Firebase cloud functions

Saving data into the real-time database

Monitoring crashes

Monitoring the application's performance

Summary

Analyzing Your Application

What are non-functional requirements?

AWS CloudTrail

AWS CloudWatch

A practical walk-through

Summary

Secure Your Application

AWS security concepts

Infrastructure hardening

Practical walk–through

Summary

Scale Your Application

Infrastructure as code

Serverless Framework

Practical walk-through

Caveats while scaling Serverless applications

Summary

Advanced AWS Services

AWS Cloud9

AWS Alexa

Summary

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Firebase cloud functions

Firebase cloud functions let you run a specific piece of code whenever an event is triggered or an HTTP request comes to your Firebase server. This is the same as AWS's Lambda functions. Firebase cloud functions can respond to:

Firebase Authentication triggers
Google Analytics for Firebase triggers
Crashlytics triggers
Cloud Storage triggers
Cloud Pub/Sub triggers
HTTP triggers

Since here we are mainly discussing Kotlin, this section will demonstrate how to use Kotlin code to write a cloud function that ultimately serves as your business logic for the API.

Furthermore, in this section, we will also see how Kotlin code is transpiled into JavaScript. Well, Firebase only supports JavaScript code (or TypeScript code to transpile at deployment) to handle events from Firebase services. For this chapter, we chose to use JavaScript. We will look at how...