Golang Socket 프로그래밍 인스턴스

package main

import (
	"net"
	"fmt"
	"strings"
)

func handle(conn net.Conn) {
	defer conn.Close()
	buf := make([]byte, 2048)
	for {
		n, err := conn.Read(buf)
		if err != nil {
			fmt.Println("read err = ", err)
			return
		}
		content := strings.TrimSpace(string(buf[:n]))
		fmt.Println("receive =", content)
		if content == "exit" {
			return
		}
		conn.Write([]byte(strings.ToUpper(content)))
	}
}

func main() {
	ss, err := net.Listen("tcp", "127.0.0.1:8000")
	if err != nil {
		fmt.Println("listen err = ", err)
		return
	}
	fmt.Println("listening at 127.0.0.1:8000")

	for {
		conn, err := ss.Accept()
		if err != nil {
			fmt.Println("connect err = ", err)
			return
		}
		go handle(conn)
	}
}

package main

import (
	"net"
	"fmt"
	"os"
)

func ScanLine() string {
	var c byte
	var err error
	var b []byte
	for ; err == nil; {
		_, err = fmt.Scanf("%c", &c)
		if c != '
' {
			b = append(b, c)
		} else {
			break;
		}
	}
	return string(b)
}

func main() {

	conn, err := net.Dial("tcp", "127.0.0.1:8000")
	if err != nil {
		fmt.Println("connect err = ", err)
		return
	}
	go func(conn net.Conn) {
		buf := make([]byte, 2048)
		for {
			n, err := conn.Read(buf)
			if err != nil {
				fmt.Println("read err = ", err)
				return
			}
			fmt.Println(string(buf[:n]))
		}
	}(conn)

	for {
		input := ScanLine()
		conn.Write([]byte(input))
		if input == "exit" {
			os.Exit(0)
		}
	}
}