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// 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/leveldb_chrome.h"
#include "third_party/leveldatabase/src/include/leveldb/cache.h"
#include "third_party/leveldatabase/src/include/leveldb/db.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 {
LevelDB::LevelDB(const char* client_name)
: open_histogram_(nullptr), destroy_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);
destroy_histogram_ = base::LinearHistogram::FactoryGet(
std::string("LevelDB.Destroy.") + 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::Init(const base::FilePath& database_dir,
const leveldb_env::Options& options) {
DFAKE_SCOPED_LOCK(thread_checker_);
database_dir_ = database_dir;
open_options_ = options;
if (database_dir.empty()) {
env_ = leveldb_chrome::NewMemEnv("LevelDB");
open_options_.env = env_.get();
}
const std::string path = database_dir.AsUTF8Unsafe();
leveldb::Status status = leveldb_env::OpenDB(open_options_, path, &db_);
if (open_histogram_)
open_histogram_->Add(leveldb_env::GetLevelDBStatusUMAValue(status));
if (status.IsCorruption()) {
if (!Destroy())
return false;
status = leveldb_env::OpenDB(open_options_, path, &db_);
// Intentionally do not log the status of the second open. Doing so destroys
// the meaning of corruptions/open which is an important statistic.
}
if (status.ok())
return true;
LOG(WARNING) << "Unable to open " << database_dir.value() << ": "
<< status.ToString();
return false;
}
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::UpdateWithRemoveFilter(const base::StringPairs& entries_to_save,
const KeyFilter& delete_key_filter) {
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));
if (!delete_key_filter.is_null()) {
leveldb::ReadOptions read_options;
std::unique_ptr<leveldb::Iterator> db_iterator(
db_->NewIterator(read_options));
for (db_iterator->SeekToFirst(); db_iterator->Valid();
db_iterator->Next()) {
leveldb::Slice key_slice = db_iterator->key();
std::string key(key_slice.data(), key_slice.size());
if (delete_key_filter.Run(key))
updates.Delete(leveldb::Slice(key));
}
}
leveldb::WriteOptions write_options;
write_options.sync = true;
leveldb::Status status = db_->Write(write_options, &updates);
if (status.ok())
return true;
DLOG(WARNING) << "Failed deleting leveldb_proto entries: "
<< status.ToString();
return false;
}
bool LevelDB::Load(std::vector<std::string>* entries) {
return LoadWithFilter(KeyFilter(), entries);
}
bool LevelDB::LoadWithFilter(const KeyFilter& filter,
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()) {
if (!filter.is_null()) {
leveldb::Slice key_slice = db_iterator->key();
if (!filter.Run(std::string(key_slice.data(), key_slice.size())))
continue;
}
leveldb::Slice value_slice = db_iterator->value();
std::string entry(value_slice.data(), value_slice.size());
entries->push_back(entry);
}
return true;
}
bool LevelDB::LoadKeys(std::vector<std::string>* keys) {
DFAKE_SCOPED_LOCK(thread_checker_);
if (!db_)
return false;
leveldb::ReadOptions options;
options.fill_cache = false;
std::unique_ptr<leveldb::Iterator> db_iterator(db_->NewIterator(options));
for (db_iterator->SeekToFirst(); db_iterator->Valid(); db_iterator->Next()) {
leveldb::Slice key_slice = db_iterator->key();
keys->push_back(std::string(key_slice.data(), key_slice.size()));
}
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;
}
bool LevelDB::Destroy() {
db_.reset();
const std::string path = database_dir_.AsUTF8Unsafe();
const leveldb::Status s = leveldb::DestroyDB(path, open_options_);
if (!s.ok())
LOG(WARNING) << "Unable to destroy " << path << ": " << s.ToString();
if (destroy_histogram_)
destroy_histogram_->Add(leveldb_env::GetLevelDBStatusUMAValue(s));
return s.ok();
}
} // namespace leveldb_proto
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