mirror of https://github.com/facebook/rocksdb.git
106 lines
3.9 KiB
C++
106 lines
3.9 KiB
C++
// 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 "rocksdb/file_system.h"
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namespace ROCKSDB_NAMESPACE {
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// A FileSystem wrapper that only allows read-only operation.
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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 ReadOnlyFileSystem : public FileSystemWrapper {
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static inline IOStatus FailReadOnly() {
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IOStatus s = IOStatus::IOError("Attempted write to ReadOnlyFileSystem");
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assert(s.GetRetryable() == false);
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return s;
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}
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public:
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explicit ReadOnlyFileSystem(const std::shared_ptr<FileSystem>& base)
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: FileSystemWrapper(base) {}
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static const char* kClassName() { return "ReadOnlyFileSystem"; }
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const char* Name() const override { return kClassName(); }
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IOStatus NewWritableFile(const std::string& /*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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return FailReadOnly();
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}
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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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return FailReadOnly();
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}
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IOStatus NewRandomRWFile(const std::string& /*fname*/,
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const FileOptions& /*options*/,
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std::unique_ptr<FSRandomRWFile>* /*result*/,
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IODebugContext* /*dbg*/) override {
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return FailReadOnly();
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}
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IOStatus NewDirectory(const std::string& /*dir*/,
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const IOOptions& /*options*/,
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std::unique_ptr<FSDirectory>* /*result*/,
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IODebugContext* /*dbg*/) override {
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return FailReadOnly();
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}
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IOStatus DeleteFile(const std::string& /*fname*/,
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const IOOptions& /*options*/,
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IODebugContext* /*dbg*/) override {
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return FailReadOnly();
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}
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IOStatus CreateDir(const std::string& /*dirname*/,
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const IOOptions& /*options*/,
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IODebugContext* /*dbg*/) override {
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return FailReadOnly();
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}
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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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// Allow if dir already exists
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bool is_dir = false;
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IOStatus s = IsDirectory(dirname, options, &is_dir, dbg);
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if (s.ok() && is_dir) {
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return s;
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} else {
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return FailReadOnly();
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}
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}
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IOStatus DeleteDir(const std::string& /*dirname*/,
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const IOOptions& /*options*/,
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IODebugContext* /*dbg*/) override {
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return FailReadOnly();
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}
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IOStatus RenameFile(const std::string& /*src*/, const std::string& /*dest*/,
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const IOOptions& /*options*/,
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IODebugContext* /*dbg*/) override {
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return FailReadOnly();
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}
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IOStatus LinkFile(const std::string& /*src*/, const std::string& /*dest*/,
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const IOOptions& /*options*/,
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IODebugContext* /*dbg*/) override {
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return FailReadOnly();
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}
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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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return FailReadOnly();
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}
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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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return FailReadOnly();
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}
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};
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} // namespace ROCKSDB_NAMESPACE
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