package utils

import (
	"errors"
	"fmt"
)

type Error string

func (err Error) Error() string { return string(err) }

var ErrNil = errors.New("redigo: nil returned")

func Bytes(reply interface{}, err error) ([]byte, error) {
	if err != nil {
		return nil, err
	}
	switch reply := reply.(type) {
	case []byte:
		return reply, nil
	case string:
		return []byte(reply), nil
	case nil:
		return nil, ErrNil
	case Error:
		return nil, reply
	}
	return nil, fmt.Errorf("redigo: unexpected type for Bytes, got type %T", reply)
}