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/*
This file is part of GNUnet.
Copyright (C) 2020--2024 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_handle.h
* @brief GNUnet MESSENGER service
*/
#ifndef GNUNET_SERVICE_MESSENGER_HANDLE_H
#define GNUNET_SERVICE_MESSENGER_HANDLE_H
#include "gnunet_util_lib.h"
#include "gnunet-service-messenger_service.h"
#include "gnunet-service-messenger_sender_session.h"
struct GNUNET_MESSENGER_SrvHandle
{
struct GNUNET_MESSENGER_Service *service;
struct GNUNET_MQ_Handle *mq;
struct GNUNET_CRYPTO_PublicKey *key;
struct GNUNET_CONTAINER_MultiHashMap *member_ids;
struct GNUNET_CONTAINER_MultiHashMap *next_ids;
struct GNUNET_CONTAINER_MultiHashMap *routing;
struct GNUNET_SCHEDULER_Task *notify;
};
/**
* Creates and allocates a new handle related to a <i>service</i> and using a given <i>mq</i> (message queue).
*
* @param[in,out] service MESSENGER Service
* @param[in,out] mq Message queue
* @return New handle
*/
struct GNUNET_MESSENGER_SrvHandle*
create_srv_handle (struct GNUNET_MESSENGER_Service *service,
struct GNUNET_MQ_Handle *mq);
/**
* Destroys a handle and frees its memory fully.
*
* @param[in,out] handle Handle
*/
void
destroy_srv_handle (struct GNUNET_MESSENGER_SrvHandle *handle);
/**
* Sets the public key of a given <i>handle</i>.
*
* @param[out] handle Handle
* @param[in] key Public key
*/
void
set_srv_handle_key (struct GNUNET_MESSENGER_SrvHandle *handle,
const struct GNUNET_CRYPTO_PublicKey *key);
/**
* Returns the public key of a given <i>handle</i>.
*
* @param[in] handle Handle
* @return Public key of handle
*/
const struct GNUNET_CRYPTO_PublicKey*
get_srv_handle_key (const struct GNUNET_MESSENGER_SrvHandle *handle);
/**
* Writes the path of the directory for a given <i>handle</i> using a specific <i>name</i> to the parameter
* <i>dir</i>. This directory will be used to store data regarding the handle and its messages.
*
* @param[in] handle Handle
* @param[in] name Potential name of the handle
* @param[out] dir Path to store data
*/
void
get_srv_handle_data_subdir (const struct GNUNET_MESSENGER_SrvHandle *handle,
const char *name,
char **dir);
/**
* Returns the member id of a given <i>handle</i> in a specific <i>room</i>.
*
* If the handle is not a member of the specific <i>room</i>, NULL gets returned.
*
* @param[in] handle Handle
* @param[in] key Key of a room
* @return Member id or NULL
*/
const struct GNUNET_ShortHashCode*
get_srv_handle_member_id (const struct GNUNET_MESSENGER_SrvHandle *handle,
const struct GNUNET_HashCode *key);
/**
* Changes the member id of a given <i>handle</i> in a specific <i>room</i> to match a <i>unique_id</i>
* and returns GNUNET_OK on success.
*
* The client connected to the <i>handle</i> will be informed afterwards automatically.
*
* @param[in,out] handle Handle
* @param[in] key Key of a room
* @param[in] unique_id Unique member id
* @return GNUNET_OK on success, otherwise GNUNET_SYSERR
*/
enum GNUNET_GenericReturnValue
change_srv_handle_member_id (struct GNUNET_MESSENGER_SrvHandle *handle,
const struct GNUNET_HashCode *key,
const struct GNUNET_ShortHashCode *unique_id);
/**
* Makes a given <i>handle</i> a member of the room using a specific <i>key</i> and opens the
* room from the handles service.
*
* @param[in,out] handle Handle
* @param[in] key Key of a room
* @return #GNUNET_YES on success, otherwise #GNUNET_NO
*/
enum GNUNET_GenericReturnValue
open_srv_handle_room (struct GNUNET_MESSENGER_SrvHandle *handle,
const struct GNUNET_HashCode *key);
/**
* Makes a given <i>handle</i> a member of the room using a specific <i>key</i> and enters the room
* through a tunnel to a peer identified by a given <i>door</i> (peer identity).
*
* @param[in,out] handle Handle
* @param[in] door Peer identity
* @param[in] key Key of a room
* @return #GNUNET_YES on success, otherwise #GNUNET_NO
*/
enum GNUNET_GenericReturnValue
entry_srv_handle_room (struct GNUNET_MESSENGER_SrvHandle *handle,
const struct GNUNET_PeerIdentity *door,
const struct GNUNET_HashCode *key);
/**
* Removes the membership of the room using a specific <i>key</i> and closes it if no other handle
* from this service is still a member of it.
*
* @param[in,out] handle Handle
* @param[in] key Key of a room
* @return #GNUNET_YES on success, otherwise #GNUNET_NO
*/
enum GNUNET_GenericReturnValue
close_srv_handle_room (struct GNUNET_MESSENGER_SrvHandle *handle,
const struct GNUNET_HashCode *key);
/**
* Returns whether a given <i>handle</i> has enabled routing for a room using a specific <i>key</i>
* by opening that room.
*
* @param[in] handle Handle
* @param[in] key Key of a room
* @return #GNUNET_YES is routing is enabled, otherwise #GNUNET_NO
*/
enum GNUNET_GenericReturnValue
is_srv_handle_routing (const struct GNUNET_MESSENGER_SrvHandle *handle,
const struct GNUNET_HashCode *key);
/**
* Returns the latest merged hash from a room of a given <i>handle</i> using a specific <i>key</i>
* and the handles own latest known <i>hash</i> of a message. If the room does not contain other
* messages being accessible to the handle and older than the provided hash, the function returns
* the originally provided hash as fallback.
*
* @param[in,out] handle Handle
* @param[in] key Key of a room
* @param[in] prev Known hash of a message
* @param[out] hash Hash of the latest merged message in a room available to the handle
*/
void
sync_srv_handle_messages (struct GNUNET_MESSENGER_SrvHandle *handle,
const struct GNUNET_HashCode *key,
const struct GNUNET_HashCode *prev,
struct GNUNET_HashCode *hash);
/**
* Sends a <i>message</i> from a given <i>handle</i> to the room using a specific <i>key</i>.
*
* @param[in,out] handle Handle
* @param[in] key Key of a room
* @param[in] message Message
* @return #GNUNET_YES on success, #GNUNET_NO or #GNUNET_SYSERR otherwise.
*/
enum GNUNET_GenericReturnValue
send_srv_handle_message (struct GNUNET_MESSENGER_SrvHandle *handle,
const struct GNUNET_HashCode *key,
const struct GNUNET_MESSENGER_Message *message);
/**
* Notifies the handle that a new message was received or sent.
*
* @param[in,out] handle Handle
* @param[in] room Room of the message
* @param[in] session Sender session
* @param[in] message Message
* @param[in] hash Hash of message
* @param[in] recent Whether the message was recently handled
*/
void
notify_srv_handle_message (struct GNUNET_MESSENGER_SrvHandle *handle,
struct GNUNET_MESSENGER_SrvRoom *room,
const struct GNUNET_MESSENGER_SenderSession *session,
const struct GNUNET_MESSENGER_Message *message,
const struct GNUNET_HashCode *hash,
enum GNUNET_GenericReturnValue recent);
/**
* Notifies the handle that a new member id needs to be used.
*
* @param[in,out] handle Handle
* @param[in] room Room of the member
* @param[in] member_id Member id
* @param[in] reset Reset member session with join message
*/
void
notify_srv_handle_member_id (struct GNUNET_MESSENGER_SrvHandle *handle,
struct GNUNET_MESSENGER_SrvRoom *room,
const struct GNUNET_ShortHashCode *member_id,
enum GNUNET_GenericReturnValue reset);
#endif //GNUNET_SERVICE_MESSENGER_HANDLE_H
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