Line data    Source code

       1             : // Copyright 2023 The LevelDB-Go and Pebble Authors. All rights reserved. Use
       2             : // of this source code is governed by a BSD-style license that can be found in
       3             : // the LICENSE file.
       4             : 
       5             : // Package vfstest provides facilities for interacting with or faking
       6             : // filesystems during tests and benchmarks.
       7             : package vfstest
       8             : 
       9             : import (
      10             :         "os"
      11             : 
      12             :         "github.com/cockroachdb/pebble/vfs"
      13             : )
      14             : 
      15             : // DiscardFile implements vfs.File but discards all written data and reads
      16             : // without mutating input buffers.
      17             : var DiscardFile vfs.File = (*discardFile)(nil)
      18             : 
      19             : type discardFile struct{}
      20             : 
      21           1 : func (*discardFile) Close() error                                   { return nil }
      22           0 : func (*discardFile) Read(p []byte) (int, error)                     { return len(p), nil }
      23           0 : func (*discardFile) ReadAt(p []byte, off int64) (int, error)        { return len(p), nil }
      24           1 : func (*discardFile) Write(p []byte) (int, error)                    { return len(p), nil }
      25           0 : func (*discardFile) WriteAt(p []byte, ofs int64) (int, error)       { return len(p), nil }
      26           0 : func (*discardFile) Preallocate(offset, length int64) error         { return nil }
      27           0 : func (*discardFile) Stat() (os.FileInfo, error)                     { return nil, nil }
      28           1 : func (*discardFile) Sync() error                                    { return nil }
      29           0 : func (*discardFile) SyncTo(length int64) (fullSync bool, err error) { return false, nil }
      30           0 : func (*discardFile) SyncData() error                                { return nil }
      31           0 : func (*discardFile) Prefetch(offset int64, length int64) error      { return nil }
      32           0 : func (*discardFile) Fd() uintptr                                    { return 0 }