Book Image

Hands-On Dependency Injection in Go

By : Corey Scott
Book Image

Hands-On Dependency Injection in Go

By: Corey Scott

Overview of this book

Hands-On Dependency Injection in Go takes you on a journey, teaching you about refactoring existing code to adopt dependency injection (DI) using various methods available in Go. Of the six methods introduced in this book, some are conventional, such as constructor or method injection, and some unconventional, such as just-in-time or config injection. Each method is explained in detail, focusing on their strengths and weaknesses, and is followed with a step-by-step example of how to apply it. With plenty of examples, you will learn how to leverage DI to transform code into something simple and flexible. You will also discover how to generate and leverage the dependency graph to spot and eliminate issues. Throughout the book, you will learn to leverage DI in combination with test stubs and mocks to test otherwise tricky or impossible scenarios. Hands-On Dependency Injection in Go takes a pragmatic approach and focuses heavily on the code, user experience, and how to achieve long-term benefits through incremental changes. By the end of this book, you will have produced clean code that’s easy to test.
Table of Contents (15 chapters)

Introduction to the ACME Registration Service

In this chapter, we will introduce a small but fake service called the ACME registration service. The code for this service will serve as the basis for most of the examples in the rest of the book. We will examine the business environment in which this service lives, discuss the goals for the service and the code, and finally, we will look at some examples of the problems that we can fix by applying dependency injection (DI).

By the end of this chapter, you should have enough knowledge to join the team as we work our way through the improvements we will make in the following chapters.

The following topics will be covered in this chapter:

  • Goals for our system
  • Introduction to our system
  • Known issues