Book Image

Mastering Go - Third Edition

By : Mihalis Tsoukalos
5 (1)
Book Image

Mastering Go - Third Edition

5 (1)
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)
14
Other Books You May Enjoy
15
Index

Versioning utilities

One of the most difficult tasks is to automatically and uniquely version command-line utilities, especially when using a CI/CD system. This section presents a technique that uses a GitHub value to version a command-line utility on your local machine.

You can apply the same technique to GitLab—just search for the available GitLab variables and values and choose one that fits your needs.

This technique is used by both the docker and kubectl utilities, among others:

$ docker version
Client: Docker Engine - Community
 Cloud integration: 1.0.4
 Version:           20.10.0
 API version:       1.41
 Go version:        go1.13.15
 Git commit:        7287ab3
 Built:             Tue Dec  8 18:55:43 2020
 OS/Arch:           darwin/amd64
...

The previous output shows that docker uses the Git commit value for versioning—we are going to use a slightly different value that is longer than the one used by docker.

The utility that...