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folderdb.go
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folderdb.go
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package utils
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
)
type FolderDatabase struct {
rootDir *os.File
permissions os.FileMode
folderSize uint64
}
func isDirectory(aPath string) bool {
fileStat, err := os.Stat(aPath)
if err != nil {
return false
}
return fileStat.IsDir()
}
func NewFolderDatabase(aPath string, aPerms os.FileMode, aFolderSize uint64) (*FolderDatabase, error) {
if !isDirectory(aPath) {
return nil, fmt.Errorf("%s is not a directory. Aborting.", aPath)
}
fileObj, err := os.Open(aPath)
if err != nil {
return nil, err
}
db := &FolderDatabase{
rootDir: fileObj,
permissions: aPerms,
folderSize: aFolderSize,
}
return db, nil
}
func idToString(aID uint64) string {
return fmt.Sprintf("%010x", aID)
}
func (db *FolderDatabase) getPathForID(aID uint64) (string, string) {
subdirName := idToString(aID / db.folderSize)
dirPath := filepath.Join(db.rootDir.Name(), subdirName)
fileName := idToString(aID)
filePath := filepath.Join(dirPath, fileName)
return dirPath, filePath
}
func (db *FolderDatabase) Store(aID uint64, aData []byte) error {
dirPath, filePath := db.getPathForID(aID)
if !isDirectory(dirPath) {
err := os.Mkdir(dirPath, os.ModeDir|0777)
if err != nil {
return err
}
}
_, err := os.Stat(filePath)
if err != nil && os.IsNotExist(err) {
return ioutil.WriteFile(filePath, aData, db.permissions)
}
// Already exists, so skip
return nil
}
func (db *FolderDatabase) Get(aID uint64) ([]byte, error) {
_, fileName := db.getPathForID(aID)
return ioutil.ReadFile(fileName)
}