SabrehavenServer/src/server.h

/**
 * Tibia GIMUD Server - a free and open-source MMORPG server emulator
 * Copyright (C) 2019 Sabrehaven and Mark Samman <mark.samman@gmail.com>
 *
 * 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 2 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, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef FS_SERVER_H_984DA68ABF744127850F90CC710F281B
#define FS_SERVER_H_984DA68ABF744127850F90CC710F281B

#include "connection.h"
#include <memory>

class Protocol;

class ServiceBase
{
public:
	virtual bool is_single_socket() const = 0;
	virtual uint8_t get_protocol_identifier() const = 0;
	virtual const char* get_protocol_name() const = 0;

	virtual Protocol_ptr make_protocol(const Connection_ptr& c) const = 0;
};

template <typename ProtocolType>
class Service final : public ServiceBase
{
public:
	bool is_single_socket() const final {
		return ProtocolType::server_sends_first;
	}
	uint8_t get_protocol_identifier() const final {
		return ProtocolType::protocol_identifier;
	}
	const char* get_protocol_name() const final {
		return ProtocolType::protocol_name();
	}

	Protocol_ptr make_protocol(const Connection_ptr& c) const final {
		return std::make_shared<ProtocolType>(c);
	}
};

class ServicePort : public std::enable_shared_from_this<ServicePort>
{
public:
	explicit ServicePort(boost::asio::io_service& io_service) : io_service(io_service) {}
	~ServicePort();

	// non-copyable
	ServicePort(const ServicePort&) = delete;
	ServicePort& operator=(const ServicePort&) = delete;

	static void openAcceptor(std::weak_ptr<ServicePort> weak_service, uint16_t port);
	void open(uint16_t port);
	void close();
	bool is_single_socket() const;
	std::string get_protocol_names() const;

	bool add_service(const Service_ptr& new_svc);
	Protocol_ptr make_protocol(NetworkMessage& msg, const Connection_ptr& connection) const;

	void onStopServer();
	void onAccept(Connection_ptr connection, const boost::system::error_code& error);

protected:
	void accept();

	boost::asio::io_service& io_service;
	std::unique_ptr<boost::asio::ip::tcp::acceptor> acceptor;
	std::vector<Service_ptr> services;

	uint16_t serverPort = 0;
	bool pendingStart = false;
};

class ServiceManager
{
public:
	ServiceManager() = default;
	~ServiceManager();

	// non-copyable
	ServiceManager(const ServiceManager&) = delete;
	ServiceManager& operator=(const ServiceManager&) = delete;

	void run();
	void stop();

	template <typename ProtocolType>
	bool add(uint16_t port);

	bool is_running() const {
		return acceptors.empty() == false;
	}

protected:
	void die();

	std::unordered_map<uint16_t, ServicePort_ptr> acceptors;

	boost::asio::io_service io_service;
	boost::asio::deadline_timer death_timer{ io_service };
	bool running = false;
};

template <typename ProtocolType>
bool ServiceManager::add(uint16_t port)
{
	if (port == 0) {
		std::cout << "ERROR: No port provided for service " << ProtocolType::protocol_name() << ". Service disabled." << std::endl;
		return false;
	}

	ServicePort_ptr service_port;

	auto foundServicePort = acceptors.find(port);

	if (foundServicePort == acceptors.end()) {
		service_port = std::make_shared<ServicePort>(io_service);
		service_port->open(port);
		acceptors[port] = service_port;
	}
	else {
		service_port = foundServicePort->second;

		if (service_port->is_single_socket() || ProtocolType::server_sends_first) {
			std::cout << "ERROR: " << ProtocolType::protocol_name() <<
				" and " << service_port->get_protocol_names() <<
				" cannot use the same port " << port << '.' << std::endl;
			return false;
		}
	}

	return service_port->add_service(std::make_shared<Service<ProtocolType>>());
}

#endif