utils.go

package store

import (
	"os"
	"path/filepath"

	"code.fbi.h-da.de/danet/gosdn/controller/nucleus/errors"
	"github.com/google/uuid"
	log "github.com/sirupsen/logrus"
)

const (
	pathToStores string = "stores"
)

// FromString is a helper to check if a provided string as a valid UUID or a name.
func FromString(id string) (uuid.UUID, error) {
	idAsUUID, err := uuid.Parse(id)

	// id is no UUID therefore it could be a device name.
	// The name will be returned within the error.
	if err != nil {
		log.WithFields(log.Fields{
			"identifier": id,
		}).Debug(err)
		return uuid.Nil, &errors.ErrInvalidUUID{DeviceName: id}
	}

	return idAsUUID, nil
}

func ensureFilesystemStorePathExists(storeFileName string) error {
	completeStorePath := filepath.Join(pathToStores, storeFileName)
	if _, err := os.Stat(completeStorePath); os.IsNotExist(err) {
		err := ensureFileSystemStoreExists(completeStorePath)
		if err != nil {
			return err
		}
	}

	return nil
}

func ensureFileSystemStoreExists(pathToStore string) error {
	err := ensureDirExists(pathToStore)
	if err != nil {
		return err
	}

	emptyArray := []byte("[]")
	err = os.WriteFile(pathToStore, emptyArray, 0600)
	if err != nil {
		return err
	}

	return nil
}

func ensureDirExists(fileName string) error {
	dirName := filepath.Dir(fileName)
	if _, serr := os.Stat(dirName); serr != nil {
		merr := os.MkdirAll(dirName, os.ModePerm)
		if merr != nil {
			return merr
		}
	}

	return nil
}

func getCompletePathToFileStore(storeName string) string {
	return filepath.Join(pathToStores, storeName)
}