| // Copyright 2018 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/download/database/download_db_impl.h" |
| |
| #include <memory> |
| |
| #include "base/bind.h" |
| #include "base/callback_helpers.h" |
| #include "base/task/post_task.h" |
| #include "components/download/database/download_db_conversions.h" |
| #include "components/download/database/download_db_entry.h" |
| #include "components/download/database/proto/download_entry.pb.h" |
| #include "components/leveldb_proto/public/proto_database_provider.h" |
| |
| namespace download { |
| |
| namespace { |
| |
| const int kMaxNumInitializeAttempts = 3; |
| |
| using ProtoKeyVector = std::vector<std::string>; |
| using ProtoEntryVector = std::vector<download_pb::DownloadDBEntry>; |
| using ProtoKeyEntryVector = |
| std::vector<std::pair<std::string, download_pb::DownloadDBEntry>>; |
| |
| // Returns the prefix to all keys in the database. |
| std::string GetDatabaseKeyPrefix(DownloadNamespace download_namespace) { |
| return DownloadNamespaceToString(download_namespace) + ","; |
| } |
| |
| // Check if an input string is under a given namespace. |
| bool IsUnderNameSpace(DownloadNamespace download_namespace, |
| const std::string& key) { |
| return base::StartsWith(key, GetDatabaseKeyPrefix(download_namespace), |
| base::CompareCase::INSENSITIVE_ASCII); |
| } |
| |
| void OnUpdateDone(bool success) { |
| // TODO(qinmin): add UMA for this. |
| if (!success) |
| LOG(ERROR) << "Update Download DB failed."; |
| } |
| |
| } // namespace |
| |
| DownloadDBImpl::DownloadDBImpl( |
| DownloadNamespace download_namespace, |
| const base::FilePath& database_dir, |
| leveldb_proto::ProtoDatabaseProvider* db_provider) |
| : download_namespace_(download_namespace) { |
| DCHECK(!database_dir.empty()); |
| db_ = db_provider->GetDB<download_pb::DownloadDBEntry>( |
| leveldb_proto::ProtoDbType::DOWNLOAD_DB, database_dir, |
| base::CreateSequencedTaskRunner( |
| {base::ThreadPool(), base::MayBlock(), |
| // USER_VISIBLE because it is required to display chrome://downloads. |
| // https://crbug.com/976223 |
| base::TaskPriority::USER_VISIBLE, |
| base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN})); |
| } |
| |
| DownloadDBImpl::DownloadDBImpl( |
| DownloadNamespace download_namespace, |
| std::unique_ptr<leveldb_proto::ProtoDatabase<download_pb::DownloadDBEntry>> |
| db) |
| : db_(std::move(db)), download_namespace_(download_namespace) {} |
| |
| DownloadDBImpl::~DownloadDBImpl() = default; |
| |
| bool DownloadDBImpl::IsInitialized() { |
| return is_initialized_; |
| } |
| |
| void DownloadDBImpl::Initialize(DownloadDBCallback callback) { |
| DCHECK(!IsInitialized()); |
| |
| // These options reduce memory consumption. |
| leveldb_env::Options options = leveldb_proto::CreateSimpleOptions(); |
| options.reuse_logs = false; |
| options.write_buffer_size = 64 << 10; // 64 KiB |
| db_->Init(options, |
| base::BindOnce(&DownloadDBImpl::OnDatabaseInitialized, |
| weak_factory_.GetWeakPtr(), std::move(callback))); |
| } |
| |
| void DownloadDBImpl::DestroyAndReinitialize(DownloadDBCallback callback) { |
| is_initialized_ = false; |
| db_->Destroy(base::BindOnce(&DownloadDBImpl::OnDatabaseDestroyed, |
| weak_factory_.GetWeakPtr(), std::move(callback))); |
| } |
| |
| void DownloadDBImpl::AddOrReplace(const DownloadDBEntry& entry) { |
| AddOrReplaceEntries(std::vector<DownloadDBEntry>{entry}, |
| base::BindOnce(&OnUpdateDone)); |
| } |
| |
| void DownloadDBImpl::AddOrReplaceEntries( |
| const std::vector<DownloadDBEntry>& entries, |
| DownloadDBCallback callback) { |
| DCHECK(IsInitialized()); |
| auto entries_to_save = std::make_unique<ProtoKeyEntryVector>(); |
| for (const auto& entry : entries) { |
| download_pb::DownloadDBEntry proto = |
| DownloadDBConversions::DownloadDBEntryToProto(entry); |
| entries_to_save->emplace_back(GetEntryKey(entry.GetGuid()), |
| std::move(proto)); |
| } |
| db_->UpdateEntries(std::move(entries_to_save), |
| std::make_unique<ProtoKeyVector>(), std::move(callback)); |
| } |
| |
| void DownloadDBImpl::LoadEntries(LoadEntriesCallback callback) { |
| db_->LoadEntriesWithFilter( |
| base::BindRepeating(&IsUnderNameSpace, download_namespace_), |
| base::BindOnce(&DownloadDBImpl::OnAllEntriesLoaded, |
| weak_factory_.GetWeakPtr(), std::move(callback))); |
| } |
| |
| void DownloadDBImpl::Remove(const std::string& guid) { |
| DCHECK(IsInitialized()); |
| auto keys_to_remove = std::make_unique<ProtoKeyVector>(); |
| keys_to_remove->push_back(GetEntryKey(guid)); |
| db_->UpdateEntries(std::make_unique<ProtoKeyEntryVector>(), |
| std::move(keys_to_remove), |
| base::BindOnce(&DownloadDBImpl::OnRemoveDone, |
| weak_factory_.GetWeakPtr())); |
| } |
| |
| std::string DownloadDBImpl::GetEntryKey(const std::string& guid) const { |
| return GetDatabaseKeyPrefix(download_namespace_) + guid; |
| } |
| |
| void DownloadDBImpl::OnAllEntriesLoaded( |
| LoadEntriesCallback callback, |
| bool success, |
| std::unique_ptr<ProtoEntryVector> entries) { |
| auto result = std::make_unique<std::vector<DownloadDBEntry>>(); |
| if (!success) { |
| std::move(callback).Run(success, std::move(result)); |
| return; |
| } |
| |
| for (const auto& entry : *entries.get()) { |
| result->emplace_back( |
| DownloadDBConversions::DownloadDBEntryFromProto(entry)); |
| } |
| std::move(callback).Run(success, std::move(result)); |
| } |
| |
| void DownloadDBImpl::OnDatabaseInitialized( |
| DownloadDBCallback callback, |
| leveldb_proto::Enums::InitStatus status) { |
| bool success = status == leveldb_proto::Enums::InitStatus::kOK; |
| if (!success) { |
| DestroyAndReinitialize(std::move(callback)); |
| return; |
| } |
| is_initialized_ = success; |
| std::move(callback).Run(success); |
| } |
| |
| void DownloadDBImpl::OnDatabaseDestroyed(DownloadDBCallback callback, |
| bool success) { |
| if (!success) { |
| std::move(callback).Run(success); |
| return; |
| } |
| |
| num_initialize_attempts_++; |
| if (num_initialize_attempts_ >= kMaxNumInitializeAttempts) |
| std::move(callback).Run(false); |
| else |
| Initialize(std::move(callback)); |
| } |
| |
| void DownloadDBImpl::OnRemoveDone(bool success) { |
| // TODO(qinmin): add UMA for this. |
| if (!success) |
| LOG(ERROR) << "Remove entry from Download DB failed."; |
| } |
| |
| } // namespace download |