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/*
This file is part of GNUnet.
Copyright (C) 2021 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
SPDX-License-Identifier: AGPL3.0-or-later
*/
/**
* @author Tobias Frisch
* @file src/messenger/gnunet-service-messenger_operation_store.h
* @brief GNUnet MESSENGER service
*/
#ifndef GNUNET_SERVICE_MESSENGER_OPERATION_STORE_H
#define GNUNET_SERVICE_MESSENGER_OPERATION_STORE_H
#include "platform.h"
#include "gnunet_container_lib.h"
#include "gnunet_crypto_lib.h"
#include "gnunet_scheduler_lib.h"
#include "gnunet_time_lib.h"
struct GNUNET_MESSENGER_SrvRoom;
struct GNUNET_MESSENGER_OperationStore
{
struct GNUNET_MESSENGER_SrvRoom *room;
struct GNUNET_CONTAINER_MultiHashMap *operations;
};
/**
* Initializes an operation <i>store</i> as fully empty with a given <i>room</i>.
*
* @param[out] store Operation store
* @param[in/out] room Room
*/
void
init_operation_store (struct GNUNET_MESSENGER_OperationStore *store, struct GNUNET_MESSENGER_SrvRoom *room);
/**
* Clears an operation <i>store</i>, stops all operations and deallocates its memory.
*
* @param[in/out] store Operation store
*/
void
clear_operation_store (struct GNUNET_MESSENGER_OperationStore *store);
/**
* Loads operations from a <i>directory</i> into an operation <i>store</i>.
*
* @param[out] store Operation store
* @param[in] directory Path to a directory
*/
void
load_operation_store (struct GNUNET_MESSENGER_OperationStore *store,
const char *directory);
/**
* Saves operations from an operation <i>store</i> into a <i>directory</i>.
*
* @param[in] store Operation store
* @param[in] directory Path to a directory
*/
void
save_operation_store (const struct GNUNET_MESSENGER_OperationStore *store,
const char *directory);
/**
* Retruns the type of the active operation under a given <i>hash</i> in
* a specific operation <i>store</i>. If there is no active operation under
* the given <i>hash</i>, #GNUNET_MESSENGER_OP_UNKNOWN gets returned instead.
*
* @param[in] store Operation store
* @param[in] hash Hash of message
* @return Type of operation or #GNUNET_MESSENGER_OP_UNKNOWN
*/
enum GNUNET_MESSENGER_OperationType
get_store_operation_type (const struct GNUNET_MESSENGER_OperationStore *store,
const struct GNUNET_HashCode *hash);
/**
* Tries to use an operation under a given <i>hash</i> in a specific
* operation <i>store</i>. The operation will use the selected <i>type</i>
* if successful. The operation will be delayed by a given <i>delay</i>.
*
* If the selected type is #GNUNET_MESSENGER_OP_DELETE any active operation
* under the given hash will be stopped and replaced.
*
* If the new operation could be started successfully the method returns
* #GNUNET_OK, otherwise #GNUNET_SYSERR.
*
* @param[in/out] store Operation store
* @param[in] hash Hash of message
* @param[in] type Operation type
* @param[in] delay Delay
* @return #GNUNET_OK on success, otherwise #GNUNET_SYSERR
*/
int
use_store_operation (struct GNUNET_MESSENGER_OperationStore *store,
const struct GNUNET_HashCode *hash,
enum GNUNET_MESSENGER_OperationType type,
struct GNUNET_TIME_Relative delay);
/**
* Stops any active operation under a given <i>hash</i> in a specific
* operation <i>store</i>.
*
* Beware that calling this method will also implicitly free the memory
* of any active operation under the given hash!
*
* @param[in/out] store Operation store
* @param[in] hash Hash of message
*/
void
cancel_store_operation (struct GNUNET_MESSENGER_OperationStore *store,
const struct GNUNET_HashCode *hash);
#endif //GNUNET_SERVICE_MESSENGER_OPERATION_STORE_H
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