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// Copyright 2020 The Gogs Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package lfsutil
import (
"io"
"os"
"path/filepath"
"github.com/pkg/errors"
"gogs.io/gogs/internal/osutil"
)
var ErrObjectNotExist = errors.New("Object does not exist")
// Storager is an storage backend for uploading and downloading LFS objects.
type Storager interface {
// Storage returns the name of the storage backend.
Storage() Storage
// Upload reads content from the io.ReadCloser and uploads as given oid.
// The reader is closed once upload is finished. ErrInvalidOID is returned
// if the given oid is not valid.
Upload(oid OID, rc io.ReadCloser) (int64, error)
// Download streams content of given oid to the io.Writer. It is caller's
// responsibility the close the writer when needed. ErrObjectNotExist is
// returned if the given oid does not exist.
Download(oid OID, w io.Writer) error
}
// Storage is the storage type of an LFS object.
type Storage string
const (
StorageLocal Storage = "local"
)
var _ Storager = (*LocalStorage)(nil)
// LocalStorage is a LFS storage backend on local file system.
type LocalStorage struct {
// The root path for storing LFS objects.
Root string
}
func (*LocalStorage) Storage() Storage {
return StorageLocal
}
func (s *LocalStorage) storagePath(oid OID) string {
if len(oid) < 2 {
return ""
}
return filepath.Join(s.Root, string(oid[0]), string(oid[1]), string(oid))
}
func (s *LocalStorage) Upload(oid OID, rc io.ReadCloser) (int64, error) {
if !ValidOID(oid) {
return 0, ErrInvalidOID
}
var err error
fpath := s.storagePath(oid)
defer func() {
rc.Close()
if err != nil {
_ = os.Remove(fpath)
}
}()
err = os.MkdirAll(filepath.Dir(fpath), os.ModePerm)
if err != nil {
return 0, errors.Wrap(err, "create directories")
}
w, err := os.Create(fpath)
if err != nil {
return 0, errors.Wrap(err, "create file")
}
defer w.Close()
written, err := io.Copy(w, rc)
if err != nil {
return 0, errors.Wrap(err, "copy file")
}
return written, nil
}
func (s *LocalStorage) Download(oid OID, w io.Writer) error {
fpath := s.storagePath(oid)
if !osutil.IsFile(fpath) {
return ErrObjectNotExist
}
r, err := os.Open(fpath)
if err != nil {
return errors.Wrap(err, "open file")
}
defer r.Close()
_, err = io.Copy(w, r)
if err != nil {
return errors.Wrap(err, "copy file")
}
return nil
}
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