Book Image

Building Microservices with Micronaut®

By : Nirmal Singh, Zack Dawood
Book Image

Building Microservices with Micronaut®

By: Nirmal Singh, Zack Dawood

Overview of this book

The open source Micronaut® framework is a JVM-based toolkit designed to create microservices quickly and easily. This book will help full-stack and Java developers build modular, high-performing, and reactive microservice-based apps using the Micronaut framework. You'll start by building microservices and learning about the core components, such as ahead-of-time compilation, reflection-less dependency injection, and reactive baked-in HTTP clients and servers. Next, you will work on a real-time microservice application and learn how to integrate Micronaut projects with different kinds of relational and non-relational databases. You'll also learn how to employ different security mechanisms to safeguard your microservices and integrate microservices using event-driven architecture in the Apache Kafka ecosystem. As you advance, you'll get to grips with automated testing and popular testing tools. The book will help you understand how you can easily handle microservice concerns in Micronaut projects, such as service discovery, API documentation, distributed configuration management, fallbacks, and circuit breakers. Finally, you'll explore the deployment and maintenance aspects of microservices and get up to speed with the Internet of Things (IoT) using the Framework. By the end of this book, you'll be able to build, test, deploy, and maintain your own microservice apps using the framework.
Table of Contents (20 chapters)
Section 1: Core Concepts and Basics
Section 2: Microservices Development
Section 3: Microservices Testing
Section 4: Microservices Deployment
Section 5: Microservices Maintenance
Section 6: IoT with Micronaut and Closure

The basics of Micronaut security

For handling any security aspects, the Micronaut framework has a built-in SecurityFilter object. The SecurityFilter object intercepts any incoming HTTP requests and kickstarts the authentication/authorization process as configured in the application. In the following diagram, you can see the workflow within the SecurityFilter object for authorizing a user request:

Figure 4.2 – Micronaut security filter

Micronaut's SecurityFilter has three essential parts:

  • AuthenticationFetcher: AuthenticationFetcher will fetch the required downstream authenticator for authenticating the user request.
  • Authenticator: Authenticator injects the configured authentication provider(s) and security configurations for authenticating the user request. An AuthenticationResponse object is created based on the success or failure of the auth operation.
  • SecurityRule: If auth is successful, then the security filter will further invoke...