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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_EXTENSIONS_API_STORAGE_SYNC_STORAGE_BACKEND_H_
#define CHROME_BROWSER_EXTENSIONS_API_STORAGE_SYNC_STORAGE_BACKEND_H_
#include <map>
#include <memory>
#include <set>
#include <string>
#include "base/memory/scoped_refptr.h"
#include "base/memory/weak_ptr.h"
#include "base/values.h"
#include "components/sync/model/syncable_service.h"
#include "components/value_store/value_store_factory.h"
#include "extensions/browser/api/storage/settings_observer.h"
#include "extensions/browser/api/storage/settings_storage_quota_enforcer.h"
#include "extensions/common/extension_id.h"
namespace value_store {
class ValueStoreFactory;
}
namespace extensions {
class SettingsSyncProcessor;
class SyncableSettingsStorage;
// Manages ValueStore objects for extensions, including routing
// changes from sync to them.
// Lives entirely on the FILE thread.
class SyncStorageBackend final : public syncer::SyncableService {
public:
// `storage_factory` is use to create leveldb storage areas.
// `observers` is the list of observers to settings changes.
SyncStorageBackend(
scoped_refptr<value_store::ValueStoreFactory> storage_factory,
const SettingsStorageQuotaEnforcer::Limits& quota,
SequenceBoundSettingsChangedCallback observer,
syncer::DataType sync_type,
const syncer::SyncableService::StartSyncFlare& flare);
SyncStorageBackend(const SyncStorageBackend&) = delete;
SyncStorageBackend& operator=(const SyncStorageBackend&) = delete;
~SyncStorageBackend() override;
value_store::ValueStore* GetStorage(const ExtensionId& extension_id);
void DeleteStorage(const ExtensionId& extension_id);
// syncer::SyncableService implementation.
void WaitUntilReadyToSync(base::OnceClosure done) override;
syncer::SyncDataList GetAllSyncDataForTesting(syncer::DataType type) const;
std::optional<syncer::ModelError> MergeDataAndStartSyncing(
syncer::DataType type,
const syncer::SyncDataList& initial_sync_data,
std::unique_ptr<syncer::SyncChangeProcessor> sync_processor) override;
std::optional<syncer::ModelError> ProcessSyncChanges(
const base::Location& from_here,
const syncer::SyncChangeList& change_list) override;
void StopSyncing(syncer::DataType type) override;
base::WeakPtr<SyncableService> AsWeakPtr() override;
private:
// Gets a weak reference to the storage area for a given extension,
// initializing sync with some initial data if sync enabled.
SyncableSettingsStorage* GetOrCreateStorageWithSyncData(
const ExtensionId& extension_id,
base::Value::Dict sync_data) const;
// Creates a new SettingsSyncProcessor for an extension.
std::unique_ptr<SettingsSyncProcessor> CreateSettingsSyncProcessor(
const ExtensionId& extension_id) const;
// The Factory to use for creating new ValueStores.
const scoped_refptr<value_store::ValueStoreFactory> storage_factory_;
// Quota limits (see SettingsStorageQuotaEnforcer).
const SettingsStorageQuotaEnforcer::Limits quota_;
// Observer to settings changes.
SequenceBoundSettingsChangedCallback observer_;
// A cache of ValueStore objects that have already been created.
// Ensure that there is only ever one created per extension.
using StorageObjMap =
std::map<ExtensionId, std::unique_ptr<SyncableSettingsStorage>>;
mutable StorageObjMap storage_objs_;
// Current sync data type. Either EXTENSION_SETTINGS or APP_SETTINGS.
syncer::DataType sync_type_;
// Current sync processor, if any.
std::unique_ptr<syncer::SyncChangeProcessor> sync_processor_;
syncer::SyncableService::StartSyncFlare flare_;
base::WeakPtrFactory<SyncStorageBackend> weak_ptr_factory_{this};
};
} // namespace extensions
#endif // CHROME_BROWSER_EXTENSIONS_API_STORAGE_SYNC_STORAGE_BACKEND_H_
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