How to correctly pass context in a goroutine when sending an SMS (two-factor authentication)?

In Go, to pass context to a goroutine when sending an SMS (for example, for two-factor authentication), you should use the context package. The context allows you to control the lifetime of the operation, cancel it, and pass additional data.

The correct way:

• Create a context with a timeout or deadline to limit the SMS sending time.
• Pass this context to the goroutine and the sending function.
• Inside the sending function, check for context cancellation to abort the operation if necessary.

Example:

func sendSMS(ctx context.Context, phone, message string) error {
    select {
    case <-time.After(2 * time.Second):
        // Simulate SMS sending
        fmt.Println("SMS sent to", phone)
        return nil
    case <-ctx.Done():
        return ctx.Err() // Cancellation or timeout
    }
}

func main() {
    ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
    defer cancel()

    go func() {
        err := sendSMS(ctx, "+1234567890", "Your code is 1234")
        if err != nil {
            fmt.Println("Failed to send SMS:", err)
        }
    }()

    time.Sleep(5 * time.Second) // Wait for completion
}

This approach ensures control over execution time and allows proper handling of operation cancellation.