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/**
* mds — A micro-display server
* Copyright © 2014, 2015, 2016 Mattias Andrée (maandree@member.fsf.org)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef MDS_MDS_SERVER_CLIENT_H
#define MDS_MDS_SERVER_CLIENT_H
#include "interception-condition.h"
#include "multicast.h"
#include <libmdsserver/mds-message.h>
#include <stdlib.h>
#include <pthread.h>
#include <stdint.h>
#include <unistd.h>
#define CLIENT_T_VERSION 0
/**
* Client information structure
*/
typedef struct client
{
/**
* The client's entry in the list of clients
*/
ssize_t list_entry;
/**
* The socket file descriptor for the socket connected to the client
*/
int socket_fd;
/**
* Whether the socket is open
*/
int open;
/**
* Message read buffer for the client
*/
struct mds_message message;
/**
* The read thread for the client
*/
pthread_t thread;
/**
* The client's ID
*/
uint64_t id;
/**
* Mutex for sending data and other
* actions that only affacts this client
*/
pthread_mutex_t mutex;
/**
* Whether `mutex` has been initialised
*/
int mutex_created;
/**
* The messages interception conditions conditions
* for the client
*/
struct interception_condition* interception_conditions;
/**
* The number of interception conditions
*/
size_t interception_conditions_count;
/**
* Pending multicast messages
*/
struct multicast* multicasts;
/**
* The number of pending multicast messages
*/
size_t multicasts_count;
/**
* Messages pending to be sent (concatenated)
*/
char* send_pending;
/**
* The character length of the messages pending to be sent
*/
size_t send_pending_size;
/**
* Pending reply to the multicast interception
*/
struct mds_message* modify_message;
/**
* Mutex for `modify_message`
*/
pthread_mutex_t modify_mutex;
/**
* Condidition for `modify_message`
*/
pthread_cond_t modify_cond;
/**
* Whether `modify_mutex` has been initialised
*/
int modify_mutex_created;
/**
* Whether `modify_cond` has been initialised
*/
int modify_cond_created;
} client_t;
/**
* Initialise a client
*
* The following fields will not be initialised:
* - message
* - thread
* - mutex
* - modify_mutex
* - modify_cond
*
* The follow fields will be initialised to `-1`:
* - list_entry
* - socket_fd
*
* @param this Memory slot in which to store the new client information
*/
__attribute__((nonnull))
void client_initialise(client_t* restrict this);
/**
* Initialise fields that have to do with threading
*
* This method initialises the following fields:
* - thread
* - mutex
* - modify_mutex
* - modify_cond
*
* @param this The client information
* @return Zero on success, -1 on error
*/
__attribute__((nonnull))
int client_initialise_threading(client_t* restrict this);
/**
* Release all resources assoicated with a client
*
* @param this The client information
*/
__attribute__((nonnull))
void client_destroy(client_t* restrict this);
/**
* Calculate the buffer size need to marshal client information
*
* @param this The client information
* @return The number of bytes to allocate to the output buffer
*/
__attribute__((pure, nonnull))
size_t client_marshal_size(const client_t* restrict this);
/**
* Marshals client information
*
* @param this The client information
* @param data Output buffer for the marshalled data
* @return The number of bytes that have been written (everything will be written)
*/
__attribute__((nonnull))
size_t client_marshal(const client_t* restrict this, char* restrict data);
/**
* Unmarshals client information
*
* @param this Memory slot in which to store the new client information
* @param data In buffer with the marshalled data
* @return Zero on error, `errno` will be set accordingly, otherwise the
* number of read bytes. Destroy the client information on error.
*/
__attribute__((nonnull))
size_t client_unmarshal(client_t* restrict this, char* restrict data);
/**
* Pretend to unmarshal client information
*
* @param data In buffer with the marshalled data
* @return The number of read bytes
*/
__attribute__((pure, nonnull))
size_t client_unmarshal_skip(char* restrict data);
#endif
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