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33 lines
1.6 KiB
Go
33 lines
1.6 KiB
Go
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// Copyright 2023 The LevelDB-Go and Pebble Authors. All rights reserved. Use
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// of this source code is governed by a BSD-style license that can be found in
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// the LICENSE file.
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// Package vfstest provides facilities for interacting with or faking
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// filesystems during tests and benchmarks.
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package vfstest
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import (
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"os"
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"github.com/cockroachdb/pebble/vfs"
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)
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// DiscardFile implements vfs.File but discards all written data and reads
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// without mutating input buffers.
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var DiscardFile vfs.File = (*discardFile)(nil)
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type discardFile struct{}
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func (*discardFile) Close() error { return nil }
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func (*discardFile) Read(p []byte) (int, error) { return len(p), nil }
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func (*discardFile) ReadAt(p []byte, off int64) (int, error) { return len(p), nil }
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func (*discardFile) Write(p []byte) (int, error) { return len(p), nil }
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func (*discardFile) WriteAt(p []byte, ofs int64) (int, error) { return len(p), nil }
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func (*discardFile) Preallocate(offset, length int64) error { return nil }
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func (*discardFile) Stat() (os.FileInfo, error) { return nil, nil }
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func (*discardFile) Sync() error { return nil }
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func (*discardFile) SyncTo(length int64) (fullSync bool, err error) { return false, nil }
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func (*discardFile) SyncData() error { return nil }
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func (*discardFile) Prefetch(offset int64, length int64) error { return nil }
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func (*discardFile) Fd() uintptr { return 0 }
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