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Mastering Go

Create Golang production applications using network libraries,

concurrency, and advanced Go data structures
Mihalis Tsoukalos

BIRMINGHAM - MUMBAI
Mastering Go
Copyright © 2018 Packt Publishing

All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or
transmitted in any form or by any means, without the prior written permission of the publisher,
except in the case of brief quotations embedded in critical articles or reviews.

Every effort has been made in the preparation of this book to ensure the accuracy of the information
presented. However, the information contained in this book is sold without warranty, either express
or implied. Neither the author, nor Packt Publishing or its dealers and distributors, will be held liable
for any damages caused or alleged to have been caused directly or indirectly by this book.

Packt Publishing has endeavored to provide trademark information about all of the companies and
products mentioned in this book by the appropriate use of capitals. However, Packt Publishing
cannot guarantee the accuracy of this information.

Acquisition Editors: Frank Pohlmann, Suresh Jain

Project Editor: Kishor Rit
Content Development Editor: Gary Schwarts
Technical Editors: Gaurav Gavas, Nidhisha Shetty
Proofreader: Tom Jacob
Indexer: Mariammal Chettiyar
Graphics: Tom Scaria
Production Coordinator: Shantanu Zagade

First published: April 2018

Production reference: 1270418

Published by Packt Publishing Ltd.

Livery Place
35 Livery Street
Birmingham
B3 2PB, UK.

ISBN 978-1-78862-654-5

www.packtpub.com
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At www.PacktPub.com, you can also read a collection of free technical

articles, sign up for a range of free newsletters, and receive
exclusive discounts and offers on Packt books and eBooks.
Contributors
About the author
Mihalis Tsoukalos is a technical author, a Unix
administrator, a developer, and a mathematician, who enjoys
learning new things. He has written more than 250 technical
articles for many publications, including Sys Admin, MacTech,
Linux User and Developer, Usenix ;login:, Linux Format, and
Linux Journal.

Mihalis is also the author of Go Systems Programming, by

Packt Publishing, 2017 and the technical editor for MongoDB
in Action, Second Edition, by Manning. Mihalis' research
interests include databases, operating systems, and statistics.
You can reach him at http://www.mtsoukalos.eu/ and @mactsouk. He is
also a photographer (http://www.highiso.net/).

I would like to thank the people at Packt Publishing for helping me write this book, including Frank
Pohlmann and Gary Schwartz, my technical reviewer, Mat Ryer, Radhika Atitkar, for her
encouragement and trust, and Kishor Rit, for answering all my questions and encouraging me
during the whole process.

For all people everywhere: You will never change your life until you change something you do
daily!
About the reviewer
Mat Ryer has been programming computers since he was 6
years old. He would build games and programs, first in BASIC
on a ZX Spectrum and then in AmigaBASIC and AMOS on
Commodore Amiga with his father. Many hours were spent on
manually copying the code from the Amiga Format magazine
and tweaking variables or moving GOTO statements around to
see what might happen. The same spirit of exploration and
obsession with programming led Mat to starting work with a
local agency in Mansfield, England, when he was 18, where he
started to build websites and other online services.

After several years of working with various technologies and

industries in London and around the world, Mat noticed a new
systems language called Go that Google was pioneering. Since
it addressed very pertinent and relevant modern technical
challenges, Mat started using it to solve problems while the
language was still in the beta stage. He has used it ever since.
Mat contributes to open-source projects and founded Go
packages, including Testify, Moq, Silk, and Is, as well as a
macOS developer tool called BitBar.

In 2018, Mat co-founded Machine Box and still spends a lot of

time speaking at conferences, writing about Go on his blog, and
is an active member of the Go community.
What this book covers
Chapter 1 , Go and the Operating System, begins by talking about
the history of Go and the advantages of Go before describing
the godoc utility and explaining how you can compile and
execute Go programs. After that, it talks about printing the
output and getting user input, working with the command-line
arguments of a program, and using log files. The last topic of
the first chapter is error handling, which plays a key role in Go.

Chapter 2 , Understanding Go Internals, discusses the Go garbage

collector and the way it operates. Then it talks about unsafe
code and the unsafe package, how to call C code from a Go
program, and how to call Go code from a C program. After that,
it showcases the use of the defer keyword and presents the
strace(1) and dtrace(1) utilities. In the remaining sections of the
chapter, you will learn how to find information about your Go
environment and the use of the Go assembler.

Chapter 3 , Working with Basic Go Data Types, talks about the

data types offered by Go, which includes arrays, slices, and
maps as well as Go pointers, constants, loops, and working
with dates and times. You would not want to miss this chapter!
Chapter 4 , The Uses of Composite Types, begins by teaching you
about Go structures and the struct keyword before discussing
tuples, strings, runes, byte slices, and string literals. The rest of
the chapter talks about regular expressions and pattern
matching, the switch statement, the strings package, the math/big
package, and about developing a key-value store in Go.

Chapter 5 , Enhancing Go Code with Data Structures, is about

developing your own data structures when the structures
offered by Go do not fit a particular problem. This includes
developing binary trees, linked lists, hash tables, stacks, and
queues and learning about their advantages. This chapter also
showcases the use of the structures found in the container
standard Go package. The last topic of this chapter is random
number generation.

Chapter 6 , What You Might Not Know About Go Packages, is all

about packages and functions, which also includes the use of
the init() function, the syscall standard Go package, and the
text/template and html/template packages. This chapter will definitely
make you a better Go developer!

Chapter 7 , Reflection and Interfaces for All Seasons, discusses

three advanced Go concepts: reflection, interfaces, and type
methods. The last part of the chapter is about object oriented
programming in Go!
Chapter 8 , Telling a Unix System What to Do, is about systems
programming in Go, which includes subjects such as the flag
package for working with command-line arguments, handling
Unix signals, file input and output, the bytes package, and the
io.Reader and io.Writer interfaces. As I told you before, if you are

really into systems programming in Go, then getting Go

Systems Programming after reading Mastering Go is highly
recommended!

Chapter 9 , Concurrency in Go – Goroutines, Channels, and

Pipelines, discusses goroutines, channels and pipelines, which
is the Go way of achieving concurrency. You will also learn
about the differences between processes, threads, and
goroutines, and the sync package and the way the Go scheduler
operates.

Chapter 10 , Concurrency in Go – Advanced Topics, will continue

from the point where the previous chapter left off and make
you a master of goroutines and channels! You will learn more
about the Go scheduler, the use of the powerful select keyword
and the various types of Go channels as well as shared memory,
mutexes, the sync.Mutex type, and the sync.RWMutex type. The last
part of the chapter will talk about the context package, worker
pools, and how to detect race conditions.

Chapter 11 , Code Testing, Optimization, and Profiling, discusses

code testing, code optimization, and code profiling as well as
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