Golang for Jobseekers: Unleash the power of Go programming for career advancement

Book title ....1

Inner title ....3

Copyright....4

Dedicated....4

About the Author....6

About the Reviewers....6

Acknowledgements....8

Preface....8

Code Bundle and Coloured Images....12

Piracy....12

Table of Contents....14

Chapter 1: Understanding Golang and its Potential....20

Introduction....20

Structure....20

Objectives....22

Characteristics of Golang Programming Language....22

Statically typed....22

Garbage collection....24

Cross-compilation....26

“Batteries Included” standard library....26

Version guarantees....26

What kind of development work is Golang used in?....28

Web applications....28

Command Line Interface (CLI)....28

Major applications written with Golang....28

Docker....30

Kubernetes....30

CockroachDB....32

Companies that use Golang....32

Cloudflare....32

Monzo....34

Conclusion....34

Chapter 2: Golang Fundamentals....36

Introduction....36

Structure....36

Objectives....38

Golang playground....38

Installing and running Golang locally....38

Main function in main package....40

Imports....40

Variable initialization....44

Basic types....44

List....48

Maps....52

Writing functions....52

Structs....58

Interfaces....64

Loops....68

Public versus private....72

Using “Go” verb....76

Channels....80

Errors....80

Conclusion....82

Chapter 3: Exploring Data Structures....84

Introduction....84

Structure....84

Objectives....86

Singly linked list....86

Doubly linked list....96

Circular linked list....98

Stack....100

Queue....102

Binary tree....104

Hashed maps....108

Conclusion....112

Chapter 4: Understanding Algorithms....114

Introduction....114

Structure....114

Objectives....116

Big O notation....116

Sorting algorithms and their importance....118

Bubble sort....118

Merge sort....122

Quick sort....126

Binary search....132

Dynamic programming....134

Conclusion....138

Chapter 5: Getting Comfortable with Go Proverbs....140

Introduction....140

Structure....142

Objectives....142

The bigger the interface, the weaker the interface....142

Make the zero value useful....142

interface{} says nothing....144

Gofmt’s style is no one’s favorite, yet everyone’s favorite....144

Errors are values....148

Do not just check errors, handle them gracefully....148

Documentation is for users....150

Do not panic....152

Accept interfaces, return structs....154

Never use global variables....158

Conclusion....160

Chapter 6: Building REST APIs....162

Introduction....162

Structure....164

Objectives....164

Why learn to build REST APIs?....164

HTTP verbs....166

HTTP status codes....168

Building a “Hello World” REST API Golang application....170

Building a URL shortener....174

Conclusion....198

Chapter 7: Testing in Golang....200

Introduction....200

Structure....202

Objectives....202

Why build tests?....202

Test-driven development....202

Writing a simple unit test....204

Table driven tests....206

Mocking....214

Setup and teardown of environments within tests....220

HTTP testing....226

Golden files....228

Conclusion....230

Chapter 8: Deploying a Golang Application in a Virtual Machine....230

Introduction....230

Structure....232

Objectives....232

Using SSH....232

Using SCP....240

Using Systemd to run the Golang application....246

Debugging the Golang application on the server....250

Real-life deployments with virtual machines....252

Conclusion....254

Chapter 9: Deploying a Containerized Golang Application....256

Introduction....256

Structure....258

Objectives....258

Docker basics....258

Docker command basics....260

Building a Golang application in a Docker container....270

Using Docker compose on a local workstation....284

Using docker-compose on a virtual machine....294

Deploying the application via Kubernetes....300

Conclusion....306

Chapter 10: Microservices with Golang Applications....308

Introduction....308

Structure....310

Objectives....310

What are microservices, and why are microservices?....310

Demo-ing an application stack with multiple applications via docker-compose....314

Demo-ing an application with multiple applications in Kubernetes....336

Conclusion....348

Chapter 11: Introduction to Monitoring and Logging....350

Introduction....350

Structure....352

Objectives....352

Why monitoring and logging are important?....352

Introduction to Prometheus....354

Instrumenting an application with metrics to be consumed by Prometheus....356

Viewing metrics on Prometheus....360

Quick word on logging....368

Conclusion....368

Chapter 12: Adding Concurrency in Golang Application....370

Introduction....370

Structure....372

Objectives....372

Concurrency features in Golang....372

Exchanging messages and persisting it locally....374

Using channels to receive interrupts in a program....378

Live reload of configurations....380

Parallelize parts of an application....384

Conclusion....388

Chapter 13: What is Next?....388

Introduction....388

Structure....388

Objectives....390

GRPC—alternative communication protocols....390

SRE principles for reliable applications....394

Profiling....394

Working with data storage....398

Embedding files....402

Generics....404

Fuzzing....406

Conclusion....408

Index....408

Back title ....414

Golang holds significance because of its emphasis on simplicity, readability, impressive performance, and built-in support for concurrency. If you want to elevate your Golang programming skills and become a more proficient developer, then this book is for you.“Golang for Jobseekers” starts by providing a comprehensive introduction to Go, covering its syntax, fundamental concepts, and unique features that make it an efficient language for development. It delves deeply into data structures and algorithms, equipping you with techniques to optimize your code and solve complex problems with elegance and speed. Furthermore, the book explores the art of building robust RESTful API applications in Go. It teaches you industry best practices and architectural patterns for creating scalable, secure, and maintainable APIs. The book then takes you through a step-by-step journey from development to production, demonstrating how to deploy Go applications in different environments, ranging from virtual machines to containers on Kubernetes. Lastly, it helps you understand essential concepts like monitoring and logging, enabling you to ensure the performance and health of your applications in real-world scenarios.By the end of the book, you will be equipped to confidently showcase your expertise during interviews, giving you a competitive edge in the job market.

What you will learn

• Gain proficiency in data structures and algorithms using Golang.
• Learn how to develop a RESTful API application using Golang.
• Acquire the knowledge and skills required to deploy an application to a virtual machine.
• Explore the process of deploying an application in a containerized environment.
• Understand the essential concepts and practices for making applications "production ready”.

Who this book is for

Ideal for newcomers to the industry, this book explores the entire journey of application development, from concept to production-ready deployment.