HttpServer.h

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/*
 * Copyright (c) 2015 Oleg Morozenkov
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#ifndef TGBOT_HTTPSERVER_H
#define TGBOT_HTTPSERVER_H

#include <string>

#include <boost/asio.hpp>

#include "tgbot/net/HttpParser.h"

namespace TgBot {

template<typename Protocol>
class HttpServer {

protected:
    class Connection;

public:
    typedef std::function<std::string (const std::string&, const std::unordered_map<std::string, std::string>)> ServerHandler;

    HttpServer(std::shared_ptr<boost::asio::basic_socket_acceptor<Protocol>> acceptor, const ServerHandler& handler) : _acceptor(acceptor), _handler(handler) {
    }

    void start() {
        auto socket(std::make_shared<boost::asio::basic_stream_socket<Protocol>>(_acceptor->get_io_service()));
        auto connection(std::make_shared<Connection>(socket, _handler));
        _acceptor->async_accept(*connection->socket, [this, connection]() {
            connection->start();
            start();
        });
        _ioService.run();
    }

    void stop() {
        _ioService.stop();
    }

protected:
    class Connection {

    public:
        Connection(std::shared_ptr<boost::asio::basic_stream_socket<Protocol>>& socket, const ServerHandler& handler) : socket(socket), _handler(handler) {
            boost::asio::socket_base::keep_alive option(true);
            socket.set_option(option);
        }

        void start() {
            data.reserve(10240);
            socket->async_receive(data, [this]() {
                std::unordered_map<std::string, std::string> headers;
                std::string body = HttpParser::getInstance().parseResponse(data, headers);
                socket->async_send(_handler(body, headers));
            });
        }

        std::shared_ptr<boost::asio::basic_stream_socket<Protocol>> socket;
        std::string data;

    protected:
        const ServerHandler _handler;
    };

    boost::asio::io_service _ioService;
    std::shared_ptr<boost::asio::basic_socket_acceptor<Protocol>> _acceptor;
    const ServerHandler _handler;
};

}

#endif //TGBOT_HTTPSERVER_H