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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_FEATURE_ENGAGEMENT_INTERNAL_EVENT_STORAGE_MIGRATION_H_
#define COMPONENTS_FEATURE_ENGAGEMENT_INTERNAL_EVENT_STORAGE_MIGRATION_H_
#include "base/memory/weak_ptr.h"
#include "components/feature_engagement/internal/proto/feature_event.pb.h"
#include "components/leveldb_proto/public/proto_database.h"
namespace feature_engagement {
// A EventStorageMigration provides the ability to migrate the event storage
// from the profile db to the device db.
// TODO(crbug.com/426624087): Remove this and all the calls related to it once
// the migration is completed.
class EventStorageMigration {
public:
// Represents the status of the profile to device migration.
// These enums are persisted as histogram entries, so this enum should be
// treated as append-only and kept in sync with
// InProductHelpEventStorageMigrationStatus in enums.xml.
enum class EventStorageMigrationStatus : int {
// The migration is not required.
kNotRequired = 0,
// The migration has started.
kStarted = 1,
// The migration has completed successfully.
kCompleted = 2,
// The migration failed to initialize.
kFailedToInitialize = 3,
// The migration failed to load.
kFailedToLoad = 4,
// The migration failed to write.
kFailedToWrite = 5,
// The maximum value of the enum.
kMaxValue = kFailedToWrite
};
explicit EventStorageMigration(
raw_ptr<leveldb_proto::ProtoDatabase<Event>> profile_db,
raw_ptr<leveldb_proto::ProtoDatabase<Event>> device_db);
EventStorageMigration(const EventStorageMigration&) = delete;
EventStorageMigration& operator=(const EventStorageMigration&) = delete;
~EventStorageMigration();
static void RecordMigrationStatus(EventStorageMigrationStatus status);
// Callback for when migration has finished. The |success|
// argument denotes whether the migration was successful.
using MigrationCallback = base::OnceCallback<void(bool success)>;
// Migrate the event storage from the profile db to the device db.
void Migrate(MigrationCallback callback);
private:
// Callback for when an underlying db has been initialized.
void OnInitializationComplete(leveldb_proto::Enums::InitStatus status);
// Called when both underlying db have finished their initialization.
void OnDBsInitializationCompleted();
// Called when the profile db has finished loading.
void OnLoadEntriesComplete(bool success,
std::unique_ptr<std::vector<Event>> entries);
// Called when the device db has finished writing.
void OnEventWrittenCompleted(bool success);
// Barrier closure that is run when both db have initialized.
base::RepeatingClosure initialization_complete_barrier_;
// Callback to be invoked once overall migration is complete.
MigrationCallback migration_callback_;
// Tracks the overall success of the initialization process. True if both
// underlying db initialize successfully.
bool initialization_success_ = false;
// The profile db.
raw_ptr<leveldb_proto::ProtoDatabase<Event>> profile_db_;
// The device db.
raw_ptr<leveldb_proto::ProtoDatabase<Event>> device_db_;
base::WeakPtrFactory<EventStorageMigration> weak_ptr_factory_{this};
};
} // namespace feature_engagement
#endif // COMPONENTS_FEATURE_ENGAGEMENT_INTERNAL_EVENT_STORAGE_MIGRATION_H_
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