Server.h

/**
 * \file Server.h
 * \author Lukas Hutak <xhutak01@stud.fit.vutbr.cz>
 * \brief Server output (header file)
 *
 * Copyright (C) 2015 CESNET, z.s.p.o.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name of the Company nor the names of its contributors
 *    may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * ALTERNATIVELY, provided that this notice is retained in full, this
 * product may be distributed under the terms of the GNU General Public
 * License (GPL) version 2 or later, in which case the provisions
 * of the GPL apply INSTEAD OF those given above.
 *
 * This software is provided ``as is, and any express or implied
 * warranties, including, but not limited to, the implied warranties of
 * merchantability and fitness for a particular purpose are disclaimed.
 * In no event shall the company or contributors be liable for any
 * direct, indirect, incidental, special, exemplary, or consequential
 * damages (including, but not limited to, procurement of substitute
 * goods or services; loss of use, data, or profits; or business
 * interruption) however caused and on any theory of liability, whether
 * in contract, strict liability, or tort (including negligence or
 * otherwise) arising in any way out of the use of this software, even
 * if advised of the possibility of such damage.
 *
 */


#ifndef SERVER_H
#define SERVER_H

#include "json.h"
#include <string>
#include <vector>
#include <pthread.h>
#include <sys/socket.h>

/**
 * \brief The class for server output interface
 */
class Server : public Output
{
public:
	Server(const pugi::xpath_node &config);
	~Server();

	// Send a record to connected clients
	void ProcessDataRecord(const std::string& record);

private:
	/** Transmission status */
	enum Send_status {
		SEND_OK,               /**< Succesfully sent */
		SEND_WOULDBLOCK,       /**< Message skipped or partly sent */
		SEND_FAILED            /**< Failed */
	};

	/** Structure for connected client */
	typedef struct client_s {
		struct sockaddr_storage info; /**< Info about client (IP, port)     */
		int socket;                   /**< Client's socket                  */
		std::string msg_rest;   /**< Rest of a message in non-blocking mode */
	} client_t;

	/** Configuration of acceptor thread */
	typedef struct acceptor_s {
		pthread_t thread;					/**< Thread */
		pthread_mutex_t mutex;              /**< Mutex for the array */
		bool stop;                          /**< Stop flag for terminating */

		int socket_fd;                      /**< Server socket */
		bool new_clients_ready;             /**< New clients flag */
		std::vector<client_t> new_clients;  /**< Array of new clients */
	} acceptor_t;

	/** Connected client */
	std::vector<client_t> _clients;
	/** Socket state */
	bool _non_blocking;
	/** Acceptor of new clients */
	acceptor_t *_acceptor;

	// Brief description of a client
	static std::string get_client_desc(const struct sockaddr_storage &client);
	// Send data to the client
	enum Send_status msg_send(const char *data, ssize_t len, client_t &client);

	// Acceptor's thread function
	static void *thread_accept(void *context);
};

#endif // SERVER_H