main.go

package main

import (
	"bufio"
	"context"
	"errors"
	"fmt"
	"io"
	"os"
	"time"
)

var totalDuration = 5 * time.Second

func main() {
	ctx, cancel := context.WithTimeout(context.Background(), totalDuration)
	defer cancel()

	name, err := getNameContext(ctx)
	if errors.Is(err, context.DeadlineExceeded) {
		fmt.Println("Sorry, time's up!, but let's check if you can entered your name")
		time.Sleep(20 * time.Second)
	}
	if err != nil {
		fmt.Fprintf(os.Stdout, "%v\n", err)
		os.Exit(1)
	}

	fmt.Fprintf(os.Stdout, "Hello %s\n", name)
}

func getNameContext(ctx context.Context) (string, error) {
	var err error
	name := "John Doe"
	c := make(chan error, 1)

	go func() {
		name, err = getName(os.Stdin, os.Stdout)
		fmt.Fprintf(os.Stdout, "Got name: %s\n", name)
		c <- err
	}()

	select {
	case <-ctx.Done():
		return name, ctx.Err()
	case err := <-c:
		return name, err
	}
}

func getName(r io.Reader, w io.Writer) (string, error) {
	scanner := bufio.NewScanner(r)
	msg := "Your name please? Press the Enter key when done"
	fmt.Fprintln(w, msg)

	scanner.Scan()
	if err := scanner.Err(); err != nil {
		return "", err
	}
	name := scanner.Text()
	if len(name) == 0 {
		return "", errors.New("you entered an empty name")
	}
	return name, nil
}