| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "components/leveldb_proto/leveldb_database.h" |
| |
| #include <string> |
| #include <vector> |
| |
| #include "base/files/file_path.h" |
| #include "base/files/file_util.h" |
| #include "base/metrics/histogram.h" |
| #include "base/strings/string_split.h" |
| #include "base/threading/thread_checker.h" |
| #include "third_party/leveldatabase/env_chromium.h" |
| #include "third_party/leveldatabase/src/helpers/memenv/memenv.h" |
| #include "third_party/leveldatabase/src/include/leveldb/db.h" |
| #include "third_party/leveldatabase/src/include/leveldb/env.h" |
| #include "third_party/leveldatabase/src/include/leveldb/iterator.h" |
| #include "third_party/leveldatabase/src/include/leveldb/options.h" |
| #include "third_party/leveldatabase/src/include/leveldb/slice.h" |
| #include "third_party/leveldatabase/src/include/leveldb/status.h" |
| #include "third_party/leveldatabase/src/include/leveldb/write_batch.h" |
| |
| namespace leveldb_proto { |
| |
| // static |
| bool LevelDB::Destroy(const base::FilePath& database_dir) { |
| const leveldb::Status s = |
| leveldb::DestroyDB(database_dir.AsUTF8Unsafe(), leveldb::Options()); |
| return s.ok(); |
| } |
| |
| LevelDB::LevelDB(const char* client_name) : open_histogram_(nullptr) { |
| // Used in lieu of UMA_HISTOGRAM_ENUMERATION because the histogram name is |
| // not a constant. |
| open_histogram_ = base::LinearHistogram::FactoryGet( |
| std::string("LevelDB.Open.") + client_name, 1, |
| leveldb_env::LEVELDB_STATUS_MAX, leveldb_env::LEVELDB_STATUS_MAX + 1, |
| base::Histogram::kUmaTargetedHistogramFlag); |
| } |
| |
| LevelDB::~LevelDB() { |
| DFAKE_SCOPED_LOCK(thread_checker_); |
| } |
| |
| bool LevelDB::InitWithOptions(const base::FilePath& database_dir, |
| const leveldb::Options& options) { |
| DFAKE_SCOPED_LOCK(thread_checker_); |
| |
| std::string path = database_dir.AsUTF8Unsafe(); |
| |
| leveldb::DB* db = NULL; |
| leveldb::Status status = leveldb::DB::Open(options, path, &db); |
| if (open_histogram_) |
| open_histogram_->Add(leveldb_env::GetLevelDBStatusUMAValue(status)); |
| if (status.IsCorruption()) { |
| base::DeleteFile(database_dir, true); |
| status = leveldb::DB::Open(options, path, &db); |
| } |
| |
| if (status.ok()) { |
| CHECK(db); |
| db_.reset(db); |
| return true; |
| } |
| |
| LOG(WARNING) << "Unable to open " << database_dir.value() << ": " |
| << status.ToString(); |
| return false; |
| } |
| |
| bool LevelDB::Init(const base::FilePath& database_dir) { |
| leveldb::Options options; |
| options.create_if_missing = true; |
| options.max_open_files = 0; // Use minimum. |
| options.reuse_logs = leveldb_env::kDefaultLogReuseOptionValue; |
| if (database_dir.empty()) { |
| env_.reset(leveldb::NewMemEnv(leveldb::Env::Default())); |
| options.env = env_.get(); |
| } |
| |
| return InitWithOptions(database_dir, options); |
| } |
| |
| bool LevelDB::Save(const base::StringPairs& entries_to_save, |
| const std::vector<std::string>& keys_to_remove) { |
| DFAKE_SCOPED_LOCK(thread_checker_); |
| if (!db_) |
| return false; |
| |
| leveldb::WriteBatch updates; |
| for (const auto& pair : entries_to_save) |
| updates.Put(leveldb::Slice(pair.first), leveldb::Slice(pair.second)); |
| |
| for (const auto& key : keys_to_remove) |
| updates.Delete(leveldb::Slice(key)); |
| |
| leveldb::WriteOptions options; |
| options.sync = true; |
| |
| leveldb::Status status = db_->Write(options, &updates); |
| if (status.ok()) |
| return true; |
| |
| DLOG(WARNING) << "Failed writing leveldb_proto entries: " |
| << status.ToString(); |
| return false; |
| } |
| |
| bool LevelDB::Load(std::vector<std::string>* entries) { |
| DFAKE_SCOPED_LOCK(thread_checker_); |
| if (!db_) |
| return false; |
| |
| leveldb::ReadOptions options; |
| std::unique_ptr<leveldb::Iterator> db_iterator(db_->NewIterator(options)); |
| for (db_iterator->SeekToFirst(); db_iterator->Valid(); db_iterator->Next()) { |
| leveldb::Slice value_slice = db_iterator->value(); |
| std::string entry(value_slice.data(), value_slice.size()); |
| entries->push_back(entry); |
| } |
| return true; |
| } |
| |
| bool LevelDB::Get(const std::string& key, bool* found, std::string* entry) { |
| DFAKE_SCOPED_LOCK(thread_checker_); |
| if (!db_) |
| return false; |
| |
| leveldb::ReadOptions options; |
| leveldb::Status status = db_->Get(options, key, entry); |
| if (status.ok()) { |
| *found = true; |
| return true; |
| } |
| if (status.IsNotFound()) { |
| *found = false; |
| return true; |
| } |
| |
| DLOG(WARNING) << "Failed loading leveldb_proto entry with key \"" << key |
| << "\": " << status.ToString(); |
| return false; |
| } |
| |
| } // namespace leveldb_proto |