Book Image

Mastering Go – Third Edition - Third Edition

By : Mihalis Tsoukalos
5 (2)
Book Image

Mastering Go – Third Edition - Third Edition

5 (2)
By: Mihalis Tsoukalos

Overview of this book

Mastering Go is the essential guide to putting Go to work on real production systems. This freshly updated third edition includes topics like creating RESTful servers and clients, understanding Go generics, and developing gRPC servers and clients. Mastering Go was written for programmers who want to explore the capabilities of Go in practice. As you work your way through the chapters, you’ll gain confidence and a deep understanding of advanced Go concepts, including concurrency and the operation of the Go Garbage Collector, using Go with Docker, writing powerful command-line utilities, working with JavaScript Object Notation (JSON) data, and interacting with databases. You’ll also improve your understanding of Go internals to optimize Go code and use data types and data structures in new and unexpected ways. This essential Go programming book will also take you through the nuances and idioms of Go with exercises and resources to fully embed your newly acquired knowledge. With the help of Mastering Go, you’ll become an expert Go programmer by building Go systems and implementing advanced Go techniques in your projects.
Table of Contents (17 chapters)
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New to Go 1.16

Go 1.16 came with some new features including embedding files in Go binaries as well as the introduction of the os.ReadDir() function, the os.DirEntry type, and the io/fs package.

As these features are related to systems programming, they are included and explored in the current chapter. We begin by presenting the embedding of files into Go binary executables.

Embedding files

This section presents a feature that first appeared in Go 1.16 that allows you to embed static assets into Go binaries. The allowed data types for keeping an embedded file are string, []byte, and embed.FS. This means that a Go binary may contain a file that you do not have to manually download when you execute the Go binary! The presented utility embeds two different files that it can retrieve based on the given command-line argument.

The code that follows, which is saved as embedFiles.go, illustrates this new Go feature:

package main
import (
    _ "embed"