forked from townforge/townforge
194 lines
6.3 KiB
C++
194 lines
6.3 KiB
C++
// Copyright (c) 2006-2013, Andrey N. Sabelnikov, www.sabelnikov.net
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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// * Neither the name of the Andrey N. Sabelnikov nor the
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// names of its contributors may be used to endorse or promote products
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// derived from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER BE LIABLE FOR ANY
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// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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#ifndef _LEVIN_PROTOCOL_HANDLER_H_
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#define _LEVIN_PROTOCOL_HANDLER_H_
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#include <boost/uuid/uuid_generators.hpp>
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#include "levin_base.h"
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#include "int-util.h"
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#undef MONERO_DEFAULT_LOG_CATEGORY
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#define MONERO_DEFAULT_LOG_CATEGORY "net"
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namespace epee
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{
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namespace levin
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{
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template<class t_connection_context = net_utils::connection_context_base>
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struct protocl_handler_config
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{
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levin_commands_handler<t_connection_context>* m_pcommands_handler;
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void (*m_pcommands_handler_destroy)(levin_commands_handler<t_connection_context>*);
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~protocl_handler_config() { if (m_pcommands_handler && m_pcommands_handler_destroy) (*m_pcommands_handler_destroy)(m_pcommands_handler); }
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};
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template<class t_connection_context = net_utils::connection_context_base>
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class protocol_handler
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{
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public:
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typedef t_connection_context connection_context;
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typedef protocl_handler_config<t_connection_context> config_type;
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protocol_handler(net_utils::i_service_endpoint* psnd_hndlr, config_type& config, t_connection_context& conn_context);
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virtual ~protocol_handler(){}
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virtual bool handle_recv(const void* ptr, size_t cb);
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bool after_init_connection(){return true;}
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private:
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enum connection_data_state
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{
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conn_state_reading_head,
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conn_state_reading_body
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};
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config_type& m_config;
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t_connection_context& m_conn_context;
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net_utils::i_service_endpoint* m_psnd_hndlr;
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std::string m_cach_in_buffer;
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connection_data_state m_state;
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bucket_head m_current_head;
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};
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template<class t_connection_context>
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protocol_handler<t_connection_context>::protocol_handler(net_utils::i_service_endpoint* psnd_hndlr, config_type& config, t_connection_context& conn_context):
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m_config(config),
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m_conn_context(conn_context),
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m_psnd_hndlr(psnd_hndlr),
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m_state(conn_state_reading_head),
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m_current_head(bucket_head())
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{}
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template<class t_connection_context>
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bool protocol_handler<t_connection_context>::handle_recv(const void* ptr, size_t cb)
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{
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if(!m_config.m_pcommands_handler)
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{
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LOG_ERROR_CC(m_conn_context, "Command handler not set!");
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return false;
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}
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m_cach_in_buffer.append((const char*)ptr, cb);
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bool is_continue = true;
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while(is_continue)
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{
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switch(m_state)
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{
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case conn_state_reading_head:
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if(m_cach_in_buffer.size() < sizeof(bucket_head))
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{
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if(m_cach_in_buffer.size() >= sizeof(uint64_t) && *((uint64_t*)m_cach_in_buffer.data()) != SWAP64LE(LEVIN_SIGNATURE))
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{
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LOG_ERROR_CC(m_conn_context, "Signature mismatch on accepted connection");
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return false;
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}
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is_continue = false;
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break;
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}
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{
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#if BYTE_ORDER == LITTLE_ENDIAN
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bucket_head &phead = *(bucket_head*)m_cach_in_buffer.data();
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#else
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bucket_head phead = *(bucket_head*)m_cach_in_buffer.data();
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phead.m_signature = SWAP64LE(phead.m_signature);
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phead.m_cb = SWAP64LE(phead.m_cb);
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phead.m_command = SWAP32LE(phead.m_command);
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phead.m_return_code = SWAP32LE(phead.m_return_code);
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phead.m_reservedA = SWAP32LE(phead.m_reservedA);
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phead.m_reservedB = SWAP32LE(phead.m_reservedB);
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#endif
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if(LEVIN_SIGNATURE != phead.m_signature)
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{
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LOG_ERROR_CC(m_conn_context, "Signature mismatch on accepted connection");
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return false;
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}
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m_current_head = phead;
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}
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m_cach_in_buffer.erase(0, sizeof(bucket_head));
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m_state = conn_state_reading_body;
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break;
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case conn_state_reading_body:
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if(m_cach_in_buffer.size() < m_current_head.m_cb)
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{
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is_continue = false;
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break;
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}
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{
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std::string buff_to_invoke;
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if(m_cach_in_buffer.size() == m_current_head.m_cb)
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buff_to_invoke.swap(m_cach_in_buffer);
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else
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{
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buff_to_invoke.assign(m_cach_in_buffer, 0, (std::string::size_type)m_current_head.m_cb);
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m_cach_in_buffer.erase(0, (std::string::size_type)m_current_head.m_cb);
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}
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if(m_current_head.m_have_to_return_data)
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{
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std::string return_buff;
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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);
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m_current_head.m_cb = return_buff.size();
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m_current_head.m_have_to_return_data = false;
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return_buff.insert(0, (const char*)&m_current_head, sizeof(m_current_head));
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if(!m_psnd_hndlr->do_send(byte_slice{std::move(return_buff)}))
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return false;
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}
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else
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m_config.m_pcommands_handler->notify(m_current_head.m_command, buff_to_invoke, m_conn_context);
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}
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m_state = conn_state_reading_head;
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break;
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default:
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LOG_ERROR_CC(m_conn_context, "Undefined state in levin_server_impl::connection_handler, m_state=" << m_state);
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return false;
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}
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}
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return true;
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}
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}
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}
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#endif //_LEVIN_PROTOCOL_HANDLER_H_
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