mirror of
https://source.quilibrium.com/quilibrium/ceremonyclient.git
synced 2024-11-15 04:35:17 +00:00
119 lines
3.0 KiB
Go
119 lines
3.0 KiB
Go
// Copyright 2023 The LevelDB-Go and Pebble Authors. All rights reserved. Use
|
|
// of this source code is governed by a BSD-style license that can be found in
|
|
// the LICENSE file.
|
|
|
|
package remote
|
|
|
|
import (
|
|
"context"
|
|
"io"
|
|
"os"
|
|
"path"
|
|
|
|
"github.com/cockroachdb/pebble/vfs"
|
|
)
|
|
|
|
// NewLocalFS returns a vfs-backed implementation of the remote.Storage
|
|
// interface (for testing). All objects will be stored at the directory
|
|
// dirname.
|
|
func NewLocalFS(dirname string, fs vfs.FS) Storage {
|
|
store := &localFSStore{
|
|
dirname: dirname,
|
|
vfs: fs,
|
|
}
|
|
return store
|
|
}
|
|
|
|
// localFSStore is a vfs-backed implementation of the remote.Storage
|
|
// interface (for testing).
|
|
type localFSStore struct {
|
|
dirname string
|
|
vfs vfs.FS
|
|
}
|
|
|
|
var _ Storage = (*localFSStore)(nil)
|
|
|
|
// Close is part of the remote.Storage interface.
|
|
func (s *localFSStore) Close() error {
|
|
*s = localFSStore{}
|
|
return nil
|
|
}
|
|
|
|
// ReadObject is part of the remote.Storage interface.
|
|
func (s *localFSStore) ReadObject(
|
|
ctx context.Context, objName string,
|
|
) (_ ObjectReader, objSize int64, _ error) {
|
|
f, err := s.vfs.Open(path.Join(s.dirname, objName))
|
|
if err != nil {
|
|
return nil, 0, err
|
|
}
|
|
stat, err := f.Stat()
|
|
if err != nil {
|
|
return nil, 0, err
|
|
}
|
|
|
|
return &localFSReader{f}, stat.Size(), nil
|
|
}
|
|
|
|
type localFSReader struct {
|
|
file vfs.File
|
|
}
|
|
|
|
var _ ObjectReader = (*localFSReader)(nil)
|
|
|
|
// ReadAt is part of the shared.ObjectReader interface.
|
|
func (r *localFSReader) ReadAt(_ context.Context, p []byte, offset int64) error {
|
|
n, err := r.file.ReadAt(p, offset)
|
|
// https://pkg.go.dev/io#ReaderAt
|
|
if err == io.EOF && n == len(p) {
|
|
return nil
|
|
}
|
|
return err
|
|
}
|
|
|
|
// Close is part of the shared.ObjectReader interface.
|
|
func (r *localFSReader) Close() error {
|
|
r.file.Close()
|
|
r.file = nil
|
|
return nil
|
|
}
|
|
|
|
// CreateObject is part of the remote.Storage interface.
|
|
func (s *localFSStore) CreateObject(objName string) (io.WriteCloser, error) {
|
|
file, err := s.vfs.Create(path.Join(s.dirname, objName))
|
|
return file, err
|
|
}
|
|
|
|
// List is part of the remote.Storage interface.
|
|
func (s *localFSStore) List(prefix, delimiter string) ([]string, error) {
|
|
// TODO(josh): For the intended use case of localfs.go of running 'pebble bench',
|
|
// List can always return <nil, nil>, since this indicates a file has only one ref,
|
|
// and since `pebble bench` implies running in a single-pebble-instance context.
|
|
// https://github.com/cockroachdb/pebble/blob/a9a079d4fb6bf4a9ebc52e4d83a76ad4cbf676cb/objstorage/objstorageprovider/shared.go#L292
|
|
return nil, nil
|
|
}
|
|
|
|
// Delete is part of the remote.Storage interface.
|
|
func (s *localFSStore) Delete(objName string) error {
|
|
return s.vfs.Remove(path.Join(s.dirname, objName))
|
|
}
|
|
|
|
// Size is part of the remote.Storage interface.
|
|
func (s *localFSStore) Size(objName string) (int64, error) {
|
|
f, err := s.vfs.Open(path.Join(s.dirname, objName))
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
defer f.Close()
|
|
stat, err := f.Stat()
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
return stat.Size(), nil
|
|
}
|
|
|
|
// IsNotExistError is part of the remote.Storage interface.
|
|
func (s *localFSStore) IsNotExistError(err error) bool {
|
|
return err == os.ErrNotExist
|
|
}
|