protohackers/cmd/smoketest/main.go

package main

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

const (
	connHost = "localhost"
	connPort = "3030"
	connType = "tcp"
)

func main() {
	l, err := net.Listen(connType, connHost+":"+connPort)
	if err != nil {
		fmt.Printf("net.Listen fail: %v\n", err)
		os.Exit(1)
	}
	defer l.Close()

	fmt.Println(fmt.Sprintf("Listening on %s:%s", connHost, connPort))

	for {
		conn, err := l.Accept()
		if err != nil {
			fmt.Printf("Error accepting: %v\n", err)
		}
		go handleRequest(conn)
	}
}

func handleRequest(conn net.Conn) {
	buf := make([]byte, 1024)
	_, err := conn.Read(buf)
	if err != nil {
		fmt.Printf("Error reading: %v\n", err)
	}
	conn.Write(buf)
	conn.Close()
}