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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Timing out HTTP connections

This section presents techniques for timing out HTTP connections that take too long to finish and work either on the server or the client side.

Using SetDeadline()

The SetDeadline() function is used by net to set the read and write deadlines of network connections. Due to the way the SetDeadline() function works, you need to call SetDeadline() before any read or write operation. Keep in mind that Go uses deadlines to implement timeouts, so you do not need to reset the timeout every time your application receives or sends any data. The use of SetDeadline() is illustrated in withDeadline.go and more specifically in the implementation of the Timeout() function:

var timeout = time.Duration(time.Second)
func Timeout(network, host string) (net.Conn, error) {
    conn, err := net.DialTimeout(network, host, timeout)
    if err != nil {
        return nil, err
    return conn, nil

The timeout...