protocol_switcher.h

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// Copyright (c) 2006-2013, Andrey N. Sabelnikov, www.sabelnikov.net
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * 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.
// * Neither the name of the Andrey N. Sabelnikov nor the
// names of its contributors may be used to endorse or promote products
// derived from this software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER  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 _PROTOCOL_SWITCHER_H_
#define _PROTOCOL_SWITCHER_H_
 
#include "levin_base.h"
#include "http_server.h"
#include "levin_protocol_handler.h"
//#include "abstract_tcp_server.h"
 
namespace epee
{
namespace net_utils
{
    struct protocl_switcher_config
    {
        http::http_custom_handler::config_type m_http_config;
        levin::protocol_handler::config_type m_levin_config;
    };
 
    
    struct i_protocol_handler
    {
        virtual bool handle_recv(const void* ptr, size_t cb)=0;
    };
 
    template<class t>
    class t_protocol_handler: public i_protocol_handler
    {
    public: 
        typedef t t_type;
        t_protocol_handler(i_service_endpoint* psnd_hndlr, typename t_type::config_type& config, const connection_context& conn_context):m_hadler(psnd_hndlr, config, conn_context)
        {}
    private:
        bool handle_recv(const void* ptr, size_t cb)
        {
            return m_hadler.handle_recv(ptr, cb);
        }
        t_type m_hadler;
    };
 
 
    class protocol_switcher
    {
    public:
        typedef protocl_switcher_config config_type;
 
        protocol_switcher(net_utils::i_service_endpoint* psnd_hndlr, config_type& config, const net_utils::connection_context_base& conn_context);
        virtual ~protocol_switcher(){}
 
        virtual bool handle_recv(const void* ptr, size_t cb);
 
        bool after_init_connection(){return true;}
    private:
        t_protocol_handler<http::http_custom_handler> m_http_handler;
        t_protocol_handler<levin::protocol_handler> m_levin_handler;
        i_protocol_handler* pcurrent_handler;
 
        std::string m_cached_buff;
    };
 
    protocol_switcher::protocol_switcher(net_utils::i_service_endpoint* psnd_hndlr, config_type& config, const net_utils::connection_context_base& conn_context):m_http_handler(psnd_hndlr, config.m_http_config, conn_context), m_levin_handler(psnd_hndlr, config.m_levin_config, conn_context), pcurrent_handler(NULL)
    {}
 
    bool protocol_switcher::handle_recv(const void* ptr, size_t cb)
    {
        if(pcurrent_handler)
            return pcurrent_handler->handle_recv(ptr, cb);
        else
        {
            m_cached_buff.append((const char*)ptr, cb);
            if(m_cached_buff.size() < sizeof(uint64_t))
                return true;
 
            if(*((uint64_t*)&m_cached_buff[0]) == LEVIN_SIGNATURE)
            {
                pcurrent_handler = &m_levin_handler;
                return pcurrent_handler->handle_recv(m_cached_buff.data(), m_cached_buff.size());
            }
            if(m_cached_buff.substr(0, 4) == "GET " || m_cached_buff.substr(0, 4) == "POST")
            {
                pcurrent_handler = &m_http_handler;
                return pcurrent_handler->handle_recv(m_cached_buff.data(), m_cached_buff.size());
            }else
            {
                LOG_ERROR("Wrong protocol accepted on port...");
                return false;
            }
        }
            
        return true;
    }
}
}
#endif //_PROTOCOL_SWITCHER_H_