fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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137 lines
5.6 KiB
137 lines
5.6 KiB
// Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#pragma once
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#include <utility>
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#include "rocksdb/file_system.h"
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namespace ROCKSDB_NAMESPACE {
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// An abstract FileSystem wrapper that creates a view of an existing
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// FileSystem by remapping names in some way.
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//
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// This class has not been fully analyzed for providing strong security
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// guarantees.
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class RemapFileSystem : public FileSystemWrapper {
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public:
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explicit RemapFileSystem(const std::shared_ptr<FileSystem>& base);
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protected:
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// Returns status and mapped-to path in the wrapped filesystem.
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// If it returns non-OK status, the returned path should not be used.
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virtual std::pair<IOStatus, std::string> EncodePath(
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const std::string& path) = 0;
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// Similar to EncodePath() except used in cases in which it is OK for
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// no file or directory on 'path' to already exist, such as if the
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// operation would create one. However, the parent of 'path' is expected
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// to exist for the operation to succeed.
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// Default implementation: call EncodePath
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virtual std::pair<IOStatus, std::string> EncodePathWithNewBasename(
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const std::string& path);
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public:
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// Left abstract:
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// const char* Name() const override { ... }
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static const char* kClassName() { return "RemapFileSystem"; }
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bool IsInstanceOf(const std::string& id) const override {
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if (id == kClassName()) {
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return true;
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} else {
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return FileSystemWrapper::IsInstanceOf(id);
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}
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}
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Status RegisterDbPaths(const std::vector<std::string>& paths) override;
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Status UnregisterDbPaths(const std::vector<std::string>& paths) override;
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IOStatus NewSequentialFile(const std::string& fname,
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const FileOptions& options,
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std::unique_ptr<FSSequentialFile>* result,
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IODebugContext* dbg) override;
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IOStatus NewRandomAccessFile(const std::string& fname,
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const FileOptions& options,
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std::unique_ptr<FSRandomAccessFile>* result,
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IODebugContext* dbg) override;
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IOStatus NewWritableFile(const std::string& fname, const FileOptions& options,
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std::unique_ptr<FSWritableFile>* result,
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IODebugContext* dbg) override;
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IOStatus ReuseWritableFile(const std::string& fname,
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const std::string& old_fname,
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const FileOptions& options,
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std::unique_ptr<FSWritableFile>* result,
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IODebugContext* dbg) override;
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IOStatus NewRandomRWFile(const std::string& fname, const FileOptions& options,
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std::unique_ptr<FSRandomRWFile>* result,
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IODebugContext* dbg) override;
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IOStatus NewDirectory(const std::string& dir, const IOOptions& options,
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std::unique_ptr<FSDirectory>* result,
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IODebugContext* dbg) override;
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IOStatus FileExists(const std::string& fname, const IOOptions& options,
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IODebugContext* dbg) override;
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IOStatus GetChildren(const std::string& dir, const IOOptions& options,
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std::vector<std::string>* result,
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IODebugContext* dbg) override;
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IOStatus GetChildrenFileAttributes(const std::string& dir,
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const IOOptions& options,
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std::vector<FileAttributes>* result,
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IODebugContext* dbg) override;
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IOStatus DeleteFile(const std::string& fname, const IOOptions& options,
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IODebugContext* dbg) override;
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IOStatus CreateDir(const std::string& dirname, const IOOptions& options,
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IODebugContext* dbg) override;
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IOStatus CreateDirIfMissing(const std::string& dirname,
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const IOOptions& options,
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IODebugContext* dbg) override;
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IOStatus DeleteDir(const std::string& dirname, const IOOptions& options,
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IODebugContext* dbg) override;
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IOStatus GetFileSize(const std::string& fname, const IOOptions& options,
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uint64_t* file_size, IODebugContext* dbg) override;
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IOStatus GetFileModificationTime(const std::string& fname,
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const IOOptions& options,
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uint64_t* file_mtime,
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IODebugContext* dbg) override;
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IOStatus IsDirectory(const std::string& path, const IOOptions& options,
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bool* is_dir, IODebugContext* dbg) override;
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IOStatus RenameFile(const std::string& src, const std::string& dest,
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const IOOptions& options, IODebugContext* dbg) override;
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IOStatus LinkFile(const std::string& src, const std::string& dest,
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const IOOptions& options, IODebugContext* dbg) override;
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IOStatus LockFile(const std::string& fname, const IOOptions& options,
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FileLock** lock, IODebugContext* dbg) override;
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IOStatus NewLogger(const std::string& fname, const IOOptions& options,
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std::shared_ptr<Logger>* result,
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IODebugContext* dbg) override;
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IOStatus GetAbsolutePath(const std::string& db_path, const IOOptions& options,
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std::string* output_path,
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IODebugContext* dbg) override;
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};
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} // namespace ROCKSDB_NAMESPACE
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