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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Developing web clients

This section shows how to develop HTTP clients starting with a simplistic version and continuing with a more advanced one. In this simplistic version, all of the work is done by the http.Get() call, which is pretty convenient when you do not want to deal with lots of options and parameters. However, this type of call gives you no flexibility over the process. Notice that http.Get() returns an http.Response value. All this is illustrated in simpleClient.go:

package main
import (
func main() {
    if len(os.Args) != 2 {
        fmt.Printf("Usage: %s URL\n", filepath.Base(os.Args[0]))

The filepath.Base() function returns the last element of a path. When given os.Args[0] as its parameter, it returns the name of the executable binary file.

    URL := os.Args[1]
    data, err := http.Get(URL)

In the previous...