Go retry function

retry.go

type Action func(context.Context) (string, error)

func Retry(action Action, retries int, delay time.Duration) Action {
	return func(ctx context.Context) (string, error) {
		for r := 0; ; r++ {
			response, err := action(ctx)
			if err == nil || r >= retries {
				// Return when there is no error or the maximum amount
				// of retries is reached.
				return response, err
			}

			log.Printf("Function call failed, retrying in %v", delay)

			select {
			case <-time.After(delay):
			case <-ctx.Done():
				return "", ctx.Err()
			}
		}
	}
}