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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 _LEVIN_PROTOCOL_HANDLER_H_
#define _LEVIN_PROTOCOL_HANDLER_H_
#include <boost/uuid/uuid_generators.hpp>
#include "levin_base.h"
#include "int-util.h"
#undef MONERO_DEFAULT_LOG_CATEGORY
#define MONERO_DEFAULT_LOG_CATEGORY "net"
namespace epee
{
namespace levin
{
template<class t_connection_context = net_utils::connection_context_base>
struct protocl_handler_config
{
levin_commands_handler<t_connection_context>* m_pcommands_handler;
void (*m_pcommands_handler_destroy)(levin_commands_handler<t_connection_context>*);
~protocl_handler_config() { if (m_pcommands_handler && m_pcommands_handler_destroy) (*m_pcommands_handler_destroy)(m_pcommands_handler); }
};
template<class t_connection_context = net_utils::connection_context_base>
class protocol_handler
{
public:
typedef t_connection_context connection_context;
typedef protocl_handler_config<t_connection_context> config_type;
protocol_handler(net_utils::i_service_endpoint* psnd_hndlr, config_type& config, t_connection_context& conn_context);
virtual ~protocol_handler(){}
virtual bool handle_recv(const void* ptr, size_t cb);
bool after_init_connection(){return true;}
private:
enum connection_data_state
{
conn_state_reading_head,
conn_state_reading_body
};
config_type& m_config;
t_connection_context& m_conn_context;
net_utils::i_service_endpoint* m_psnd_hndlr;
std::string m_cach_in_buffer;
connection_data_state m_state;
bucket_head m_current_head;
};
template<class t_connection_context>
protocol_handler<t_connection_context>::protocol_handler(net_utils::i_service_endpoint* psnd_hndlr, config_type& config, t_connection_context& conn_context):
m_config(config),
m_conn_context(conn_context),
m_psnd_hndlr(psnd_hndlr),
m_state(conn_state_reading_head),
m_current_head(bucket_head())
{}
template<class t_connection_context>
bool protocol_handler<t_connection_context>::handle_recv(const void* ptr, size_t cb)
{
if(!m_config.m_pcommands_handler)
{
LOG_ERROR_CC(m_conn_context, "Command handler not set!");
return false;
}
m_cach_in_buffer.append((const char*)ptr, cb);
bool is_continue = true;
while(is_continue)
{
switch(m_state)
{
case conn_state_reading_head:
if(m_cach_in_buffer.size() < sizeof(bucket_head))
{
if(m_cach_in_buffer.size() >= sizeof(uint64_t) && *((uint64_t*)m_cach_in_buffer.data()) != SWAP64LE(LEVIN_SIGNATURE))
{
LOG_ERROR_CC(m_conn_context, "Signature mismatch on accepted connection");
return false;
}
is_continue = false;
break;
}
{
#if BYTE_ORDER == LITTLE_ENDIAN
bucket_head &phead = *(bucket_head*)m_cach_in_buffer.data();
#else
bucket_head phead = *(bucket_head*)m_cach_in_buffer.data();
phead.m_signature = SWAP64LE(phead.m_signature);
phead.m_cb = SWAP64LE(phead.m_cb);
phead.m_command = SWAP32LE(phead.m_command);
phead.m_return_code = SWAP32LE(phead.m_return_code);
phead.m_reservedA = SWAP32LE(phead.m_reservedA);
phead.m_reservedB = SWAP32LE(phead.m_reservedB);
#endif
if(LEVIN_SIGNATURE != phead.m_signature)
{
LOG_ERROR_CC(m_conn_context, "Signature mismatch on accepted connection");
return false;
}
m_current_head = phead;
}
m_cach_in_buffer.erase(0, sizeof(bucket_head));
m_state = conn_state_reading_body;
break;
case conn_state_reading_body:
if(m_cach_in_buffer.size() < m_current_head.m_cb)
{
is_continue = false;
break;
}
{
std::string buff_to_invoke;
if(m_cach_in_buffer.size() == m_current_head.m_cb)
buff_to_invoke.swap(m_cach_in_buffer);
else
{
buff_to_invoke.assign(m_cach_in_buffer, 0, (std::string::size_type)m_current_head.m_cb);
m_cach_in_buffer.erase(0, (std::string::size_type)m_current_head.m_cb);
}
if(m_current_head.m_have_to_return_data)
{
std::string return_buff;
m_current_head.m_return_code = m_config.m_pcommands_handler->invoke(m_current_head.m_command, buff_to_invoke, return_buff, m_conn_context);
m_current_head.m_cb = return_buff.size();
m_current_head.m_have_to_return_data = 0;
return_buff.insert(0, (const char*)&m_current_head, sizeof(m_current_head));
if(!m_psnd_hndlr->do_send(byte_slice{std::move(return_buff)}))
return false;
}
else
m_config.m_pcommands_handler->notify(m_current_head.m_command, buff_to_invoke, m_conn_context);
}
m_state = conn_state_reading_head;
break;
default:
LOG_ERROR_CC(m_conn_context, "Undefined state in levin_server_impl::connection_handler, m_state=" << m_state);
return false;
}
}
return true;
}
}
}
#endif //_LEVIN_PROTOCOL_HANDLER_H_
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