server.go

package main

import (
	"log"
	"net"
)

func main() {
	port := ":8888"
	tcpAddr, err := net.ResolveTCPAddr("tcp4", port)
	if err != nil {
		log.Fatal(err)
	}

	listener, err := net.ListenTCP("tcp", tcpAddr)
	if err != nil {
		log.Fatal(err)
	}

	for {
		conn, err := listener.Accept()
		if err != nil {
			continue
		}

		go echo(conn)
	}
}

func echo(conn net.Conn) {
	defer conn.Close()

	msgBuff := make([]byte, 1024)

	msglen, err := conn.Read(msgBuff)
	if err != nil {
		log.Println(err)
	}

	log.Println(string(msgBuff[:msglen]))
	conn.Write(msgBuff[:msglen])
}