ceremonyclient/pebble/vfs/vfstest/vfstest.go

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2024-01-03 07:31:42 +00:00
// 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 vfstest provides facilities for interacting with or faking
// filesystems during tests and benchmarks.
package vfstest
import (
"os"
"github.com/cockroachdb/pebble/vfs"
)
// DiscardFile implements vfs.File but discards all written data and reads
// without mutating input buffers.
var DiscardFile vfs.File = (*discardFile)(nil)
type discardFile struct{}
func (*discardFile) Close() error { return nil }
func (*discardFile) Read(p []byte) (int, error) { return len(p), nil }
func (*discardFile) ReadAt(p []byte, off int64) (int, error) { return len(p), nil }
func (*discardFile) Write(p []byte) (int, error) { return len(p), nil }
func (*discardFile) WriteAt(p []byte, ofs int64) (int, error) { return len(p), nil }
func (*discardFile) Preallocate(offset, length int64) error { return nil }
func (*discardFile) Stat() (os.FileInfo, error) { return nil, nil }
func (*discardFile) Sync() error { return nil }
func (*discardFile) SyncTo(length int64) (fullSync bool, err error) { return false, nil }
func (*discardFile) SyncData() error { return nil }
func (*discardFile) Prefetch(offset int64, length int64) error { return nil }
func (*discardFile) Fd() uintptr { return 0 }