Created
November 29, 2023 08:02
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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 | |
} |
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