Book Image

Go: Design Patterns for Real-World Projects

By : Vladimir Vivien, Mario Castro Contreras, Mat Ryer
Book Image

Go: Design Patterns for Real-World Projects

By: Vladimir Vivien, Mario Castro Contreras, Mat Ryer

Overview of this book

The Go programming language has firmly established itself as a favorite for building complex and scalable system applications. Go offers a direct and practical approach to programming that lets programmers write correct and predictable code using concurrency idioms and a full-featured standard library. This practical guide is full of real-world examples to help you get started with Go in no time at all. You’ll start by understanding the fundamentals of Go, then get a detailed description of the Go data types, program structures, and Maps. After that, you’ll learn how to use Go concurrency idioms to avoid pitfalls and create programs that are exact in expected behavior. Next, you will get familiar with the tools and libraries that are available in Go to write and exercise tests, benchmarking, and code coverage. After that, you will be able to utilize some of the most important features of GO such as Network Programming and OS integration to build efficient applications. Then you’ll start applying your skills to build some amazing projects in Go. You will learn to develop high-quality command-line tools that utilize the powerful shell capabilities and perform well using Go’s built-in concurrency mechanisms. Scale, performance, and high availability lie at the heart of our projects, and the lessons learned throughout the sections 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. With these skills in hand, you will be able to conquer all your fears of application development and go on to build large, robust and succinct apps in Go. This Learning Path combines some of the best that Packt has to offer in one complete, curated package. It includes content from the following Packt products: 1. Learning Go Programming 2. Go Design Patterns 3. Go Programming Blueprints, Second Edition
Table of Contents (38 chapters)
Go: Design Patterns for Real-World Projects
Credits
Preface
Bibliography

Working with files


The os package (https://golang.org/pkg/os/) exposes the os.File type which represents a file handle on the system. The os.File type implements several IO primitives, including the io.Reader and io.Writer interfaces, which allows file content to be processed using the standard streaming IO API.

Creating and opening files

The os.Create function creates a new file with the specified path. If the file already exists, os.Create will overwrite it. The os.Open function, on the other hand, opens an existing file for reading.

The following source snippet opens an existing file and creates a copy of its content using the io.Copy function. One common, and recommended practice to notice is the deferred call to the method Close on the file. This ensures a graceful release of OS resources when the function exits:

func main() { 
   f1, err := os.Open("./file0.go") 
   if err != nil { 
         fmt.Println("Unable to open file:", err) 
         os.Exit(1) 
   } &...