Book Image

The Go Workshop

By : Delio D'Anna, Andrew Hayes, Sam Hennessy, Jeremy Leasor, Gobin Sougrakpam, Dániel Szabó
Book Image

The Go Workshop

By: Delio D'Anna, Andrew Hayes, Sam Hennessy, Jeremy Leasor, Gobin Sougrakpam, Dániel Szabó

Overview of this book

The Go Workshop will take the pain out of learning the Go programming language (also known as Golang). It is designed to teach you to be productive in building real-world software. Presented in an engaging, hands-on way, this book focuses on the features of Go that are used by professionals in their everyday work. Each concept is broken down, clearly explained, and followed up with activities to test your knowledge and build your practical skills. Your first steps will involve mastering Go syntax, working with variables and operators, and using core and complex types to hold data. Moving ahead, you will build your understanding of programming logic and implement Go algorithms to construct useful functions. As you progress, you'll discover how to handle errors, debug code to troubleshoot your applications, and implement polymorphism using interfaces. The later chapters will then teach you how to manage files, connect to a database, work with HTTP servers and REST APIs, and make use of concurrent programming. Throughout this Workshop, you'll work on a series of mini projects, including a shopping cart, a loan calculator, a working hours tracker, a web page counter, a code checker, and a user authentication system. By the end of this book, you'll have the knowledge and confidence to tackle your own ambitious projects with Go.
Table of Contents (21 chapters)
Free Chapter
1. Variables and Operators
2. Logic and Loops

HTTP Handler

In order to react to an HTTP request, we need to write something that, we usually say, handles the request; hence, we call this something a handler. In Go, we have several ways to do that, and one is to implement the handler interface of the http package. This interface has one method that is pretty self-explanatory, and this is as follows:

ServeHTTP(w http.ResponseWriter, r *http.Request)

So, whenever we need to create a handler for HTTP requests, we can create a struct including this method and we can use it to handle an HTTP request. For example:

type MyHandler struct {}
func(h MyHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {}

This is a valid HTTP handler and you can use it this way:

http.ListenAndServe(":8080", MyHandler{})

Here, ListenAndServe() is a function that will use our handler to serve the requests; any struct implementing the handler interface will be fine. However, we need to let our server do something.

As you...