/
directory_downloader.go
83 lines (65 loc) · 2.26 KB
/
directory_downloader.go
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package internal
import (
"github.com/pkg/errors"
"github.com/apecloud/dataprotection-wal-g/pkg/storages/storage"
"github.com/apecloud/dataprotection-wal-g/utility"
"github.com/wal-g/tracelog"
)
type DirectoryDownloader interface {
DownloadDirectory(pathToRestore string) error
}
type DirectoryIsNotEmptyError struct {
error
}
type CommonDirectoryDownloader struct {
Folder storage.Folder
BackupName string
}
func NewCommonDirectoryDownloader(folder storage.Folder, backupName string) DirectoryDownloader {
return &CommonDirectoryDownloader{folder, backupName}
}
func NewDirectoryIsNotEmptyError(path string) DirectoryIsNotEmptyError {
return DirectoryIsNotEmptyError{errors.Errorf("Directory %v must have no files", path)}
}
func (downloader *CommonDirectoryDownloader) DownloadDirectory(pathToRestore string) error {
tarsToExtract, err := downloader.getTarsToExtract()
if err != nil {
return err
}
isEmpty, err := utility.IsDirectoryEmpty(pathToRestore)
if err != nil {
return err
}
if !isEmpty {
return NewDirectoryIsNotEmptyError(pathToRestore)
}
return ExtractAll(NewFileTarInterpreter(pathToRestore), tarsToExtract)
}
func (downloader *CommonDirectoryDownloader) getTarPartitionFolder() storage.Folder {
return downloader.Folder.GetSubFolder(downloader.BackupName + TarPartitionFolderName)
}
func (downloader *CommonDirectoryDownloader) getTarNames() (names []string, err error) {
tarPartitionFolder := downloader.getTarPartitionFolder()
objects, _, err := tarPartitionFolder.ListFolder()
if err != nil {
return nil, errors.Wrapf(err, "unable to list backup '%s' for deletion", downloader.BackupName)
}
result := make([]string, len(objects))
for id, object := range objects {
result[id] = object.GetName()
}
return result, nil
}
func (downloader *CommonDirectoryDownloader) getTarsToExtract() (tarsToExtract []ReaderMaker, err error) {
tarNames, err := downloader.getTarNames()
if err != nil {
return nil, err
}
tracelog.DebugLogger.Printf("Tars to extract: '%+v'\n", tarNames)
tarsToExtract = make([]ReaderMaker, 0, len(tarNames))
for _, tarName := range tarNames {
tarToExtract := NewStorageReaderMaker(downloader.getTarPartitionFolder(), tarName)
tarsToExtract = append(tarsToExtract, tarToExtract)
}
return tarsToExtract, nil
}