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