fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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263 lines
8.6 KiB
263 lines
8.6 KiB
// Copyright (c) 2019-present, Facebook, Inc. 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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//
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#include "rocksdb/file_system.h"
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#include "env/composite_env_wrapper.h"
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#include "env/env_chroot.h"
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#include "env/env_encryption_ctr.h"
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#include "env/fs_readonly.h"
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#include "env/mock_env.h"
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#include "options/db_options.h"
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#include "rocksdb/convenience.h"
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#include "rocksdb/utilities/customizable_util.h"
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#include "rocksdb/utilities/object_registry.h"
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#include "rocksdb/utilities/options_type.h"
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#include "util/string_util.h"
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#include "utilities/env_timed.h"
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namespace ROCKSDB_NAMESPACE {
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FileSystem::FileSystem() {}
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FileSystem::~FileSystem() {}
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Status FileSystem::Load(const std::string& value,
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std::shared_ptr<FileSystem>* result) {
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return CreateFromString(ConfigOptions(), value, result);
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}
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#ifndef ROCKSDB_LITE
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static int RegisterBuiltinFileSystems(ObjectLibrary& library,
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const std::string& /*arg*/) {
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library.Register<FileSystem>(
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TimedFileSystem::kClassName(),
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[](const std::string& /*uri*/, std::unique_ptr<FileSystem>* guard,
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std::string* /* errmsg */) {
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guard->reset(new TimedFileSystem(nullptr));
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return guard->get();
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});
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library.Register<FileSystem>(
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ReadOnlyFileSystem::kClassName(),
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[](const std::string& /*uri*/, std::unique_ptr<FileSystem>* guard,
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std::string* /* errmsg */) {
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guard->reset(new ReadOnlyFileSystem(nullptr));
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return guard->get();
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});
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library.Register<FileSystem>(
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EncryptedFileSystem::kClassName(),
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[](const std::string& /*uri*/, std::unique_ptr<FileSystem>* guard,
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std::string* errmsg) {
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Status s = NewEncryptedFileSystemImpl(nullptr, nullptr, guard);
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if (!s.ok()) {
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*errmsg = s.ToString();
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}
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return guard->get();
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});
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library.Register<FileSystem>(
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MockFileSystem::kClassName(),
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[](const std::string& /*uri*/, std::unique_ptr<FileSystem>* guard,
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std::string* /*errmsg*/) {
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guard->reset(new MockFileSystem(SystemClock::Default()));
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return guard->get();
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});
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#ifndef OS_WIN
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library.Register<FileSystem>(
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ChrootFileSystem::kClassName(),
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[](const std::string& /*uri*/, std::unique_ptr<FileSystem>* guard,
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std::string* /* errmsg */) {
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guard->reset(new ChrootFileSystem(nullptr, ""));
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return guard->get();
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});
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#endif // OS_WIN
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size_t num_types;
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return static_cast<int>(library.GetFactoryCount(&num_types));
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}
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#endif // ROCKSDB_LITE
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Status FileSystem::CreateFromString(const ConfigOptions& config_options,
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const std::string& value,
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std::shared_ptr<FileSystem>* result) {
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auto default_fs = FileSystem::Default();
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if (default_fs->IsInstanceOf(value)) {
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*result = default_fs;
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return Status::OK();
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} else {
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#ifndef ROCKSDB_LITE
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static std::once_flag once;
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std::call_once(once, [&]() {
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RegisterBuiltinFileSystems(*(ObjectLibrary::Default().get()), "");
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});
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#endif // ROCKSDB_LITE
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return LoadSharedObject<FileSystem>(config_options, value, nullptr, result);
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}
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}
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IOStatus FileSystem::ReuseWritableFile(const std::string& fname,
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const std::string& old_fname,
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const FileOptions& opts,
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std::unique_ptr<FSWritableFile>* result,
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IODebugContext* dbg) {
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IOStatus s = RenameFile(old_fname, fname, opts.io_options, dbg);
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if (!s.ok()) {
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return s;
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}
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return NewWritableFile(fname, opts, result, dbg);
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}
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FileOptions FileSystem::OptimizeForLogRead(
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const FileOptions& file_options) const {
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FileOptions optimized_file_options(file_options);
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optimized_file_options.use_direct_reads = false;
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return optimized_file_options;
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}
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FileOptions FileSystem::OptimizeForManifestRead(
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const FileOptions& file_options) const {
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FileOptions optimized_file_options(file_options);
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optimized_file_options.use_direct_reads = false;
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return optimized_file_options;
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}
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FileOptions FileSystem::OptimizeForLogWrite(const FileOptions& file_options,
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const DBOptions& db_options) const {
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FileOptions optimized_file_options(file_options);
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optimized_file_options.bytes_per_sync = db_options.wal_bytes_per_sync;
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optimized_file_options.writable_file_max_buffer_size =
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db_options.writable_file_max_buffer_size;
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return optimized_file_options;
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}
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FileOptions FileSystem::OptimizeForManifestWrite(
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const FileOptions& file_options) const {
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return file_options;
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}
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FileOptions FileSystem::OptimizeForCompactionTableWrite(
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const FileOptions& file_options,
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const ImmutableDBOptions& db_options) const {
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FileOptions optimized_file_options(file_options);
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optimized_file_options.use_direct_writes =
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db_options.use_direct_io_for_flush_and_compaction;
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return optimized_file_options;
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}
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FileOptions FileSystem::OptimizeForCompactionTableRead(
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const FileOptions& file_options,
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const ImmutableDBOptions& db_options) const {
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FileOptions optimized_file_options(file_options);
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optimized_file_options.use_direct_reads = db_options.use_direct_reads;
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return optimized_file_options;
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}
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FileOptions FileSystem::OptimizeForBlobFileRead(
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const FileOptions& file_options,
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const ImmutableDBOptions& db_options) const {
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FileOptions optimized_file_options(file_options);
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optimized_file_options.use_direct_reads = db_options.use_direct_reads;
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return optimized_file_options;
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}
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IOStatus WriteStringToFile(FileSystem* fs, const Slice& data,
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const std::string& fname, bool should_sync) {
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std::unique_ptr<FSWritableFile> file;
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EnvOptions soptions;
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IOStatus s = fs->NewWritableFile(fname, soptions, &file, nullptr);
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if (!s.ok()) {
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return s;
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}
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s = file->Append(data, IOOptions(), nullptr);
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if (s.ok() && should_sync) {
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s = file->Sync(IOOptions(), nullptr);
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}
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if (!s.ok()) {
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fs->DeleteFile(fname, IOOptions(), nullptr);
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}
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return s;
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}
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IOStatus ReadFileToString(FileSystem* fs, const std::string& fname,
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std::string* data) {
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FileOptions soptions;
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data->clear();
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std::unique_ptr<FSSequentialFile> file;
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IOStatus s = status_to_io_status(
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fs->NewSequentialFile(fname, soptions, &file, nullptr));
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if (!s.ok()) {
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return s;
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}
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static const int kBufferSize = 8192;
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char* space = new char[kBufferSize];
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while (true) {
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Slice fragment;
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s = file->Read(kBufferSize, IOOptions(), &fragment, space,
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nullptr);
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if (!s.ok()) {
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break;
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}
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data->append(fragment.data(), fragment.size());
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if (fragment.empty()) {
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break;
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}
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}
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delete[] space;
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return s;
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}
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namespace {
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static std::unordered_map<std::string, OptionTypeInfo> fs_wrapper_type_info = {
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#ifndef ROCKSDB_LITE
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{"target",
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OptionTypeInfo::AsCustomSharedPtr<FileSystem>(
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0, OptionVerificationType::kByName, OptionTypeFlags::kDontSerialize)},
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#endif // ROCKSDB_LITE
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};
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} // namespace
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FileSystemWrapper::FileSystemWrapper(const std::shared_ptr<FileSystem>& t)
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: target_(t) {
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RegisterOptions("", &target_, &fs_wrapper_type_info);
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}
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Status FileSystemWrapper::PrepareOptions(const ConfigOptions& options) {
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if (target_ == nullptr) {
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target_ = FileSystem::Default();
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}
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return FileSystem::PrepareOptions(options);
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}
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#ifndef ROCKSDB_LITE
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std::string FileSystemWrapper::SerializeOptions(
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const ConfigOptions& config_options, const std::string& header) const {
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auto parent = FileSystem::SerializeOptions(config_options, "");
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if (config_options.IsShallow() || target_ == nullptr ||
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target_->IsInstanceOf(FileSystem::kDefaultName())) {
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return parent;
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} else {
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std::string result = header;
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if (!StartsWith(parent, OptionTypeInfo::kIdPropName())) {
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result.append(OptionTypeInfo::kIdPropName()).append("=");
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}
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result.append(parent);
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if (!EndsWith(result, config_options.delimiter)) {
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result.append(config_options.delimiter);
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}
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result.append("target=").append(target_->ToString(config_options));
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return result;
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}
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}
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#endif // ROCKSDB_LITE
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DirFsyncOptions::DirFsyncOptions() { reason = kDefault; }
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DirFsyncOptions::DirFsyncOptions(std::string file_renamed_new_name) {
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reason = kFileRenamed;
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renamed_new_name = file_renamed_new_name;
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}
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DirFsyncOptions::DirFsyncOptions(FsyncReason fsync_reason) {
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assert(fsync_reason != kFileRenamed);
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reason = fsync_reason;
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}
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} // namespace ROCKSDB_NAMESPACE
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