rocksdb/env/fs_readonly.h
sdong 4720ba4391 Remove RocksDB LITE (#11147)
Summary:
We haven't been actively mantaining RocksDB LITE recently and the size must have been gone up significantly. We are removing the support.

Most of changes were done through following comments:

unifdef -m -UROCKSDB_LITE `git grep -l ROCKSDB_LITE | egrep '[.](cc|h)'`

by Peter Dillinger. Others changes were manually applied to build scripts, CircleCI manifests, ROCKSDB_LITE is used in an expression and file db_stress_test_base.cc.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/11147

Test Plan: See CI

Reviewed By: pdillinger

Differential Revision: D42796341

fbshipit-source-id: 4920e15fc2060c2cd2221330a6d0e5e65d4b7fe2
2023-01-27 13:14:19 -08:00

106 lines
3.9 KiB
C++

// Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
#pragma once
#include "rocksdb/file_system.h"
namespace ROCKSDB_NAMESPACE {
// A FileSystem wrapper that only allows read-only operation.
//
// This class has not been fully analyzed for providing strong security
// guarantees.
class ReadOnlyFileSystem : public FileSystemWrapper {
static inline IOStatus FailReadOnly() {
IOStatus s = IOStatus::IOError("Attempted write to ReadOnlyFileSystem");
assert(s.GetRetryable() == false);
return s;
}
public:
explicit ReadOnlyFileSystem(const std::shared_ptr<FileSystem>& base)
: FileSystemWrapper(base) {}
static const char* kClassName() { return "ReadOnlyFileSystem"; }
const char* Name() const override { return kClassName(); }
IOStatus NewWritableFile(const std::string& /*fname*/,
const FileOptions& /*options*/,
std::unique_ptr<FSWritableFile>* /*result*/,
IODebugContext* /*dbg*/) override {
return FailReadOnly();
}
IOStatus ReuseWritableFile(const std::string& /*fname*/,
const std::string& /*old_fname*/,
const FileOptions& /*options*/,
std::unique_ptr<FSWritableFile>* /*result*/,
IODebugContext* /*dbg*/) override {
return FailReadOnly();
}
IOStatus NewRandomRWFile(const std::string& /*fname*/,
const FileOptions& /*options*/,
std::unique_ptr<FSRandomRWFile>* /*result*/,
IODebugContext* /*dbg*/) override {
return FailReadOnly();
}
IOStatus NewDirectory(const std::string& /*dir*/,
const IOOptions& /*options*/,
std::unique_ptr<FSDirectory>* /*result*/,
IODebugContext* /*dbg*/) override {
return FailReadOnly();
}
IOStatus DeleteFile(const std::string& /*fname*/,
const IOOptions& /*options*/,
IODebugContext* /*dbg*/) override {
return FailReadOnly();
}
IOStatus CreateDir(const std::string& /*dirname*/,
const IOOptions& /*options*/,
IODebugContext* /*dbg*/) override {
return FailReadOnly();
}
IOStatus CreateDirIfMissing(const std::string& dirname,
const IOOptions& options,
IODebugContext* dbg) override {
// Allow if dir already exists
bool is_dir = false;
IOStatus s = IsDirectory(dirname, options, &is_dir, dbg);
if (s.ok() && is_dir) {
return s;
} else {
return FailReadOnly();
}
}
IOStatus DeleteDir(const std::string& /*dirname*/,
const IOOptions& /*options*/,
IODebugContext* /*dbg*/) override {
return FailReadOnly();
}
IOStatus RenameFile(const std::string& /*src*/, const std::string& /*dest*/,
const IOOptions& /*options*/,
IODebugContext* /*dbg*/) override {
return FailReadOnly();
}
IOStatus LinkFile(const std::string& /*src*/, const std::string& /*dest*/,
const IOOptions& /*options*/,
IODebugContext* /*dbg*/) override {
return FailReadOnly();
}
IOStatus LockFile(const std::string& /*fname*/, const IOOptions& /*options*/,
FileLock** /*lock*/, IODebugContext* /*dbg*/) override {
return FailReadOnly();
}
IOStatus NewLogger(const std::string& /*fname*/, const IOOptions& /*options*/,
std::shared_ptr<Logger>* /*result*/,
IODebugContext* /*dbg*/) override {
return FailReadOnly();
}
};
} // namespace ROCKSDB_NAMESPACE