Book Image

Mastering Go – Third Edition - Third Edition

By : Mihalis Tsoukalos
5 (2)
Book Image

Mastering Go – Third Edition - Third Edition

5 (2)
By: Mihalis Tsoukalos

Overview of this book

Mastering Go is the essential guide to putting Go to work on real production systems. This freshly updated third edition includes topics like creating RESTful servers and clients, understanding Go generics, and developing gRPC servers and clients. Mastering Go was written for programmers who want to explore the capabilities of Go in practice. As you work your way through the chapters, you’ll gain confidence and a deep understanding of advanced Go concepts, including concurrency and the operation of the Go Garbage Collector, using Go with Docker, writing powerful command-line utilities, working with JavaScript Object Notation (JSON) data, and interacting with databases. You’ll also improve your understanding of Go internals to optimize Go code and use data types and data structures in new and unexpected ways. This essential Go programming book will also take you through the nuances and idioms of Go with exercises and resources to fully embed your newly acquired knowledge. With the help of Mastering Go, you’ll become an expert Go programmer by building Go systems and implementing advanced Go techniques in your projects.
Table of Contents (17 chapters)
14
Other Books You May Enjoy
15
Index

Developing a TCP client

This section presents two equivalent ways of developing TCP clients.

Developing a TCP client with net.Dial()

First, we are going to present the most widely used way, which is implemented in tcpC.go:

package main
import (
    "bufio"
    "fmt"
    "net"
    "os"
    "strings"
)

The import block contains packages such as bufio and fmt that also work with file I/O operations.

func main() {
    arguments := os.Args
    if len(arguments) == 1 {
        fmt.Println("Please provide host:port.")
        return
    }

First, we read the details of the TCP server we want to connect to.

    connect := arguments[1]
    c, err := net.Dial("tcp", connect)
    if err != nil {
        fmt.Println(err)
        return
    }

With the connection details, we call net.Dial()—its first parameter is the protocol we want to use, which in this case is tcp, and its second parameter...