package main

import (
    "fmt"
    "net"
    "os"
    "time"
    "strconv"
)

const (
    CONN_HOST = "localhost"
    CONN_PORT = "3333"
    CONN_TYPE = "tcp"
)

func main() {
    // Listen for incoming connections.
    l, err := net.Listen(CONN_TYPE, CONN_HOST+":"+CONN_PORT)
    if err != nil {
        fmt.Println("Error listening:", err.Error())
        os.Exit(1)
    }
    // Close the listener when the application closes.
    defer l.Close()
    fmt.Println("Listening on " + CONN_HOST + ":" + CONN_PORT)
    for {
        // Listen for an incoming connection.
        conn, err := l.Accept()
        if err != nil {
            fmt.Println("Error accepting: ", err.Error())
            os.Exit(1)
        }
        // Handle connections in a new goroutine.
        go handleRequest(conn)
    }
}

// Handles incoming requests.
func handleRequest(conn net.Conn) {
  // Make a buffer to hold incoming data.
  for {
    buf := make([]byte, 1024)
    // Read the incoming connection into the buffer.
    len, err := conn.Read(buf)
    if err != nil {
        fmt.Println("Error reading:", err.Error())
        break
    }
    // Send a response back to person contacting us.
    conn.Write([]byte("Message received. " + string(buf[:len])))
    fmt.Printf("%s[% x]\n", buf[:len], buf[:len])
    // Close the connection when you're done with it.
     ticker := time.NewTicker(time.Millisecond * 500)
    go func() {
        sayac := 0
        for t := range ticker.C {
            sayac += 1
            conn.Write([]byte("rutin mesaj. " + strconv.Itoa(sayac) + " " + t.String()))
        }
    }()
  }

  conn.Close()
}