package store

import (

"os"

"regexp"

"strings"

"github.com/docker/docker/pkg/namesgenerator"

"github.com/pkg/errors"

)

var namePattern = regexp.MustCompile(`^[a-zA-Z][a-zA-Z0-9\.\-_]*$`)

type errInvalidName struct {

error

}

func (e *errInvalidName) Error() string {

return e.error.Error()

}

func (e *errInvalidName) Unwrap() error {

return e.error

}

func IsErrInvalidName(err error) bool {

_, ok := err.(*errInvalidName)

return ok

}

func ValidateName(s string) (string, error) {

if !namePattern.MatchString(s) {

return "", &errInvalidName{

errors.Errorf("invalid name %s, name needs to start with a letter and may not contain symbols, except ._-", s),

}

}

return strings.ToLower(s), nil

}

func GenerateName(txn *Txn) (string, error) {

var name string

for i := 0; i < 6; i++ {

name = namesgenerator.GetRandomName(i)

if _, err := txn.NodeGroupByName(name); err != nil {

if !os.IsNotExist(errors.Cause(err)) {

return "", err

}

} else {

continue

}

return name, nil

}

return "", errors.Errorf("failed to generate random name")

}