Simple echo server in Go

echod.go

package main

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

func printBanner() {
	fmt.Printf("[%d] Server started, ConnectionSharer version 0.0.1\n", os.Getpid())
}

func createListener() net.Listener {
	port := "9999"
	listener, err := net.Listen("tcp", ":"+port)
	if err != nil {
		fmt.Println("Error on listen: ", err.Error())
		os.Exit(1)
	}
	fmt.Println("The server is now ready to accept connections on port", port)
	return listener
}

func acceptConnection(listener net.Listener) net.Conn {
	connection, err := listener.Accept()
	if err != nil {
		fmt.Println("Error on accept: ", err.Error())
		os.Exit(1)
	}
	fmt.Println("Accepted", connection.RemoteAddr().String())

	return connection
}

func handleConnection(conn net.Conn) {
	defer conn.Close()
	for {
		if shouldQuit := handle(conn); shouldQuit {
			return
		}
	}
}

func handle(conn net.Conn) (shouldQuit bool) {
	r := bufio.NewReader(conn)
	w := bufio.NewWriter(conn)
	line, err := r.ReadString('\n')
	if err != nil {
		fmt.Println("Error reading line: ", err)
		return true
	}
	fmt.Print("Got line: ", line)
	w.WriteString(line)
	w.Flush()
	return false
}

func main() {
	printBanner()

	listener := createListener()
	defer listener.Close()

	for {
		conn := acceptConnection(listener)
		go handleConnection(conn)
	}
}