func writeToServer(conn net.Conn, ctx context.Context, wg *sync.WaitGroup) {
 defer wg.Done()

 scanCh := make(chan string, 0)

 go func() {
  for {
   scanner := bufio.NewScanner(os.Stdin)

   if !scanner.Scan() {
    return
   }

   log.Println(scanner.Err())

   scanCh <- scanner.Text()
  }
 }()

 for {
  select {
  case <-ctx.Done():
   fmt.Println("done received in client goroutine")
   return
  case cmd := <-scanCh:
   conn.Write([]byte(fmt.Sprintf("%s\n", cmd)))
  }
 }
}