10. Data IO in Go | Learning Go Programming

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Learning Go Programming

4.8 (5)

Learning Go Programming

4.8 (5)

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 let programmers write correct and predictable code using concurrency idioms and a full-featured standard library. This is a step-by-step, practical guide full of real world examples to help you get started with Go in no time at all. We start off by understanding the fundamentals of Go, followed by a detailed description of the Go data types, program structures and Maps. After this, you learn how to use Go concurrency idioms to avoid pitfalls and create programs that are exact in expected behavior. Next, you will be familiarized with the tools and libraries that are available in Go for writing and exercising tests, benchmarking, and code coverage. Finally, 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. All the concepts are explained in a crisp and concise manner and by the end of this book; you would be able to create highly efficient programs that you can deploy over cloud.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. A First Step in Go

1. A First Step in Go

The Go programming language

Playing with Go

Your first Go program

Go in a nutshell

Summary

2. Go Language Essentials

2. Go Language Essentials

The Go source file

Go identifiers

Go variables

Go constants

Go operators

Summary

3. Go Control Flow

3. Go Control Flow

The if statement

Switch statements

The for statements

The break, continue, and goto statements

Summary

4. Data Types

4. Data Types

Go types

Numeric types

Boolean type

Rune and string types

Pointers

Type declaration

Type conversion

Summary

5. Functions in Go

5. Functions in Go

Go functions

Passing parameter values

Higher-order functions

Error signaling and handling

Deferring function calls

Function panic and recovery

Summary

6. Go Packages and Programs

6. Go Packages and Programs

The Go package

Creating packages

Building packages

Package visibility

Importing package

Package initialization

Creating programs

Remote packages

Summary

7. Composite Types

7. Composite Types

The array type

The slice type

The map type

The struct type

Summary

8. Methods, Interfaces, and Objects

8. Methods, Interfaces, and Objects

Go methods

Objects in Go

The interface type

Type assertion

Summary

9. Concurrency

9. Concurrency

Goroutines

Channels

Writing concurrent programs

The sync package

Detecting race conditions

Parallelism in Go

Summary

10. Data IO in Go

10. Data IO in Go

IO with readers and writers

The io.Reader interface

The io.Writer interface

Working with the io package

Working with files

Formatted IO with fmt

Buffered IO

In-memory IO

Encoding and decoding data

Summary

11. Writing Networked Services

11. Writing Networked Services

The net package

A TCP API server

The HTTP package

A JSON API server

Summary

12. Code Testing

12. Code Testing

The Go test tool

Writing Go tests

HTTP testing

Test coverage

Code benchmark

Summary

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Working with the io package

The obvious place to start with IO is, well, the io package (https://golang.org/pkg/io). As we have already seen, the io package defines input and output primitives as the io.Reader and io.Writer interfaces. The following table summarizes additional functions and types, available in the io package, that facilitate streaming IO operations.

Function

Description

io.Copy()

The io.Copy function (and its variants io.CopyBuffer and io.CopyN) make it easy to copy data from an arbitrary io.Reader source into an equally arbitrary io.Writer sink as shown in the following snippet:

data := strings.NewReader("Write   me down.")   
file, _ := os.Create("./iocopy.data")   
io.Copy(file, data)

golang.fyi/ch10/iocopy.go

PipeReader PipeWriter

The io package includes the PipeReader and PipeWriter types that model IO operations as an in-memory pipe. Data is written to the pipe's io.Writer and can independently be read at the pipe's io.Reader. The following...

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