Book Image

.Go Programming Blueprints - Second Edition

By : Mat Ryer
Book Image

.Go Programming Blueprints - Second Edition

By: Mat Ryer

Overview of this book

Go is the language of the Internet age, and the latest version of Go comes with major architectural changes. Implementation of the language, runtime, and libraries has changed significantly. The compiler and runtime are now written entirely in Go. The garbage collector is now concurrent and provides dramatically lower pause times by running in parallel with other Go routines when possible. This book will show you how to leverage all the latest features and much more. This book shows you how to build powerful systems and drops you into real-world situations. You will learn to develop high quality command-line tools that utilize the powerful shell capabilities and perform well using Go's in-built concurrency mechanisms. Scale, performance, and high availability lie at the heart of our projects, and the lessons learned throughout this book will arm you with everything you need to build world-class solutions. You will get a feel for app deployment using Docker and Google App Engine. Each project could form the basis of a start-up, which means they are directly applicable to modern software markets.
Table of Contents (19 chapters)
Go Programming Blueprints Second Edition
About the Author
About the Reviewer

Serving our API with one function

A web service is nothing more than a simple Go program that binds to a specific HTTP address and port and serves requests, so we get to use all our command-line tool writing knowledge and techniques.


We also want to ensure that our main function is as simple and modest as possible, which is always a goal of coding, especially in Go.

Before writing our main function, let's look at a few design goals of our API program:

  • We should be able to specify the HTTP address and port to which our API listens and the address of the MongoDB instances without having to recompile the program (through command-line flags)

    We want the program to gracefully shut down when we terminate it, allowing the in-flight requests (requests that are still being processed when the termination signal is sent to our program) to complete

  • We want the program to log out status updates and report errors properly

Atop the main.go file, replace the main function placeholder with the following code...