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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Using go:generate

Although go:generate is not directly connected to testing or profiling, it is a handy and advanced Go feature and I believe that this chapter is the perfect place for discussing it as it can also help you with testing. The go:generate directive is associated with the go generate command, was added in Go 1.4 in order to help with automation, and allows you to run commands described by directives within existing files.

The go generate command supports the -v, -n, and -x flags. The -v flag prints the names of packages and files as they are processed whereas the -n flag prints the commands that would be executed. Last, the -x flag prints commands as they are executed—this is great for debugging go:generate commands.

The main reasons that you might need to use go:generate are the following:

  • You want to download dynamic data from the Internet or some other source prior to the execution of the Go code.
  • You want to execute some code prior...