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#pragma once
#include <Access/IAccessStorage.h>
#include <base/defines.h>
#include <Common/CacheBase.h>
#include <mutex>
namespace DB
{
/// Implementation of IAccessStorage which contains multiple nested storages.
class MultipleAccessStorage : public IAccessStorage
{
public:
static constexpr char STORAGE_TYPE[] = "multiple";
using Storage = IAccessStorage;
using StoragePtr = std::shared_ptr<Storage>;
using ConstStoragePtr = std::shared_ptr<const Storage>;
explicit MultipleAccessStorage(const String & storage_name_ = STORAGE_TYPE);
~MultipleAccessStorage() override;
const char * getStorageType() const override { return STORAGE_TYPE; }
bool isReadOnly() const override;
bool isReadOnly(const UUID & id) const override;
void startPeriodicReloading() override;
void stopPeriodicReloading() override;
void reload(ReloadMode reload_mode) override;
void setStorages(const std::vector<StoragePtr> & storages);
void addStorage(const StoragePtr & new_storage);
void removeStorage(const StoragePtr & storage_to_remove);
std::vector<StoragePtr> getStorages();
std::vector<ConstStoragePtr> getStorages() const;
std::shared_ptr<const std::vector<StoragePtr>> getStoragesPtr();
ConstStoragePtr findStorage(const UUID & id) const;
StoragePtr findStorage(const UUID & id);
ConstStoragePtr getStorage(const UUID & id) const;
StoragePtr getStorage(const UUID & id);
ConstStoragePtr findStorageByName(const String & storage_name) const;
StoragePtr findStorageByName(const String & storage_name);
ConstStoragePtr getStorageByName(const String & storage_name) const;
StoragePtr getStorageByName(const String & storage_name);
/// Search for an access entity storage, excluding one. Returns nullptr if not found.
StoragePtr findExcludingStorage(AccessEntityType type, const String & name, StoragePtr exclude) const;
void moveAccessEntities(const std::vector<UUID> & ids, const String & source_storage_name, const String & destination_storage_name);
bool exists(const UUID & id) const override;
bool isBackupAllowed() const override;
bool isRestoreAllowed() const override;
void backup(BackupEntriesCollector & backup_entries_collector, const String & data_path_in_backup, AccessEntityType type) const override;
void restoreFromBackup(RestorerFromBackup & restorer) override;
bool containsStorage(std::string_view storage_type) const;
protected:
std::optional<UUID> findImpl(AccessEntityType type, const String & name) const override;
std::vector<UUID> findAllImpl(AccessEntityType type) const override;
AccessEntityPtr readImpl(const UUID & id, bool throw_if_not_exists) const override;
std::optional<std::pair<String, AccessEntityType>> readNameWithTypeImpl(const UUID & id, bool throw_if_not_exists) const override;
bool insertImpl(const UUID & id, const AccessEntityPtr & entity, bool replace_if_exists, bool throw_if_exists) override;
bool removeImpl(const UUID & id, bool throw_if_not_exists) override;
bool updateImpl(const UUID & id, const UpdateFunc & update_func, bool throw_if_not_exists) override;
std::optional<UUID> authenticateImpl(const Credentials & credentials, const Poco::Net::IPAddress & address, const ExternalAuthenticators & external_authenticators, bool throw_if_user_not_exists, bool allow_no_password, bool allow_plaintext_password) const override;
private:
using Storages = std::vector<StoragePtr>;
std::shared_ptr<const Storages> getStoragesInternal() const;
std::shared_ptr<const Storages> nested_storages TSA_GUARDED_BY(mutex);
mutable CacheBase<UUID, Storage> ids_cache TSA_GUARDED_BY(mutex);
mutable std::mutex mutex;
mutable std::mutex move_mutex;
};
}
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