577 lines
18 KiB
C++
577 lines
18 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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#pragma once
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#include ""
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#include "net_helper.h"
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#include "levin_base.h"
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namespace epee
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{
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namespace levin
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{
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/************************************************************************
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* levin_client_async - probably it is not really fast implementation,
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* each handler thread could make up to 30 ms latency.
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* But, handling events in reader thread will cause dead locks in
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* case of recursive call (call invoke() to the same connection
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* on reader thread on remote invoke() handler)
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***********************************************************************/
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class levin_client_async
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{
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levin_commands_handler* m_pcommands_handler;
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volatile uint32_t m_is_stop;
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volatile uint32_t m_threads_count;
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::critical_section m_send_lock;
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std::string m_local_invoke_buff;
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::critical_section m_local_invoke_buff_lock;
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volatile int m_invoke_res;
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volatile uint32_t m_invoke_data_ready;
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volatile uint32_t m_invoke_is_active;
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boost::mutex m_invoke_event;
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boost::condition_variable m_invoke_cond;
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size_t m_timeout;
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::critical_section m_recieved_packets_lock;
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struct packet_entry
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{
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bucket_head m_hd;
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std::string m_body;
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uint32_t m_connection_index;
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};
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std::list<packet_entry> m_recieved_packets;
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/*
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m_current_connection_index needed when some connection was broken and reconnected - in this
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case we could have some received packets in que, which shoud not be handled
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*/
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volatile uint32_t m_current_connection_index;
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::critical_section m_invoke_lock;
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::critical_section m_reciev_packet_lock;
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::critical_section m_connection_lock;
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net_utils::blocked_mode_client m_transport;
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public:
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levin_client_async():m_pcommands_handler(NULL), m_is_stop(0), m_threads_count(0), m_invoke_data_ready(0), m_invoke_is_active(0)
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{}
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levin_client_async(const levin_client_async& /*v*/):m_pcommands_handler(NULL), m_is_stop(0), m_threads_count(0), m_invoke_data_ready(0), m_invoke_is_active(0)
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{}
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~levin_client_async()
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{
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boost::interprocess::ipcdetail::atomic_write32(&m_is_stop, 1);
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disconnect();
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while(boost::interprocess::ipcdetail::atomic_read32(&m_threads_count))
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::Sleep(100);
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}
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void set_handler(levin_commands_handler* phandler)
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{
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m_pcommands_handler = phandler;
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}
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bool connect(uint32_t ip, uint32_t port, uint32_t timeout)
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{
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loop_call_guard();
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critical_region cr(m_connection_lock);
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m_timeout = timeout;
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bool res = false;
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CRITICAL_REGION_BEGIN(m_reciev_packet_lock);
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CRITICAL_REGION_BEGIN(m_send_lock);
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res = levin_client_impl::connect(ip, port, timeout);
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boost::interprocess::ipcdetail::atomic_inc32(&m_current_connection_index);
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CRITICAL_REGION_END();
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CRITICAL_REGION_END();
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if(res && !boost::interprocess::ipcdetail::atomic_read32(&m_threads_count) )
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{
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//boost::interprocess::ipcdetail::atomic_write32(&m_is_stop, 0);//m_is_stop = false;
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boost::thread( boost::bind(&levin_duplex_client::reciever_thread, this) );
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boost::thread( boost::bind(&levin_duplex_client::handler_thread, this) );
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boost::thread( boost::bind(&levin_duplex_client::handler_thread, this) );
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}
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return res;
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}
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bool is_connected()
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{
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loop_call_guard();
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critical_region cr(m_cs);
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return levin_client_impl::is_connected();
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}
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inline
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bool check_connection()
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{
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loop_call_guard();
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critical_region cr(m_cs);
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if(!is_connected())
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{
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if( !reconnect() )
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{
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LOG_ERROR("Reconnect Failed. Failed to invoke() becouse not connected!");
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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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inline
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bool recv_n(SOCKET s, char* pbuff, size_t cb)
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{
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while(cb)
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{
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int res = ::recv(m_socket, pbuff, (int)cb, 0);
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if(SOCKET_ERROR == res)
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{
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if(!m_connected)
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return false;
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int err = ::WSAGetLastError();
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LOG_ERROR("Failed to recv(), err = " << err << " \"" << socket_errors::get_socket_error_text(err) <<"\"");
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disconnect();
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//reconnect();
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return false;
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}else if(res == 0)
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{
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disconnect();
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//reconnect();
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return false;
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}
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LOG_PRINT_L4("[" << m_socket <<"] RECV " << res);
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cb -= res;
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pbuff += res;
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}
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return true;
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}
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//------------------------------------------------------------------------------
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inline
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bool recv_n(SOCKET s, std::string& buff)
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{
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size_t cb_remain = buff.size();
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char* m_current_ptr = (char*)buff.data();
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return recv_n(s, m_current_ptr, cb_remain);
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}
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bool disconnect()
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{
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//boost::interprocess::ipcdetail::atomic_write32(&m_is_stop, 1);//m_is_stop = true;
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loop_call_guard();
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critical_region cr(m_cs);
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levin_client_impl::disconnect();
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CRITICAL_REGION_BEGIN(m_local_invoke_buff_lock);
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m_local_invoke_buff.clear();
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m_invoke_res = LEVIN_ERROR_CONNECTION_DESTROYED;
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CRITICAL_REGION_END();
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boost::interprocess::ipcdetail::atomic_write32(&m_invoke_data_ready, 1); //m_invoke_data_ready = true;
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m_invoke_cond.notify_all();
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return true;
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}
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void loop_call_guard()
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{
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}
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void on_leave_invoke()
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{
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boost::interprocess::ipcdetail::atomic_write32(&m_invoke_is_active, 0);
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}
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int invoke(const GUID& target, int command, const std::string& in_buff, std::string& buff_out)
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{
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critical_region cr_invoke(m_invoke_lock);
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boost::interprocess::ipcdetail::atomic_write32(&m_invoke_is_active, 1);
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boost::interprocess::ipcdetail::atomic_write32(&m_invoke_data_ready, 0);
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misc_utils::destr_ptr hdlr = misc_utils::add_exit_scope_handler(boost::bind(&levin_duplex_client::on_leave_invoke, this));
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loop_call_guard();
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if(!check_connection())
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return LEVIN_ERROR_CONNECTION_DESTROYED;
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bucket_head head = {0};
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head.m_signature = LEVIN_SIGNATURE;
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head.m_cb = in_buff.size();
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head.m_have_to_return_data = true;
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head.m_id = target;
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#ifdef TRACE_LEVIN_PACKETS_BY_GUIDS
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::UuidCreate(&head.m_id);
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#endif
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head.m_command = command;
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head.m_protocol_version = LEVIN_PROTOCOL_VER_1;
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head.m_flags = LEVIN_PACKET_REQUEST;
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LOG_PRINT("[" << m_socket <<"] Sending invoke data", LOG_LEVEL_4);
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CRITICAL_REGION_BEGIN(m_send_lock);
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LOG_PRINT_L4("[" << m_socket <<"] SEND " << sizeof(head));
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int res = ::send(m_socket, (const char*)&head, sizeof(head), 0);
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if(SOCKET_ERROR == res)
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{
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int err = ::WSAGetLastError();
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LOG_ERROR("Failed to send(), err = " << err << " \"" << socket_errors::get_socket_error_text(err) <<"\"");
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disconnect();
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return LEVIN_ERROR_CONNECTION_DESTROYED;
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}
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LOG_PRINT_L4("[" << m_socket <<"] SEND " << (int)in_buff.size());
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res = ::send(m_socket, in_buff.data(), (int)in_buff.size(), 0);
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if(SOCKET_ERROR == res)
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{
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int err = ::WSAGetLastError();
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LOG_ERROR("Failed to send(), err = " << err << " \"" << socket_errors::get_socket_error_text(err) <<"\"");
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disconnect();
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return LEVIN_ERROR_CONNECTION_DESTROYED;
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}
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CRITICAL_REGION_END();
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LOG_PRINT_L4("LEVIN_PACKET_SENT. [len=" << head.m_cb << ", flags=" << head.m_flags << ", is_cmd=" << head.m_have_to_return_data <<", cmd_id = " << head.m_command << ", pr_v=" << head.m_protocol_version << ", uid=" << string_tools::get_str_from_guid_a(head.m_id) << "]");
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//hard coded timeout in 10 minutes for maximum invoke period. if it happens, it could mean only some real troubles.
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boost::system_time timeout = boost::get_system_time()+ boost::posix_time::milliseconds(100);
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size_t timeout_count = 0;
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boost::unique_lock<boost::mutex> lock(m_invoke_event);
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while(!boost::interprocess::ipcdetail::atomic_read32(&m_invoke_data_ready))
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{
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if(!m_invoke_cond.timed_wait(lock, timeout))
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{
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if(timeout_count < 10)
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{
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//workaround to avoid freezing at timed_wait called after notify_all.
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timeout = boost::get_system_time()+ boost::posix_time::milliseconds(100);
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++timeout_count;
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continue;
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}else if(timeout_count == 10)
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{
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//workaround to avoid freezing at timed_wait called after notify_all.
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timeout = boost::get_system_time()+ boost::posix_time::minutes(10);
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++timeout_count;
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continue;
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}else
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{
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LOG_PRINT("[" << m_socket <<"] Timeout on waiting invoke result. ", LOG_LEVEL_0);
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//disconnect();
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return LEVIN_ERROR_CONNECTION_TIMEDOUT;
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}
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}
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}
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CRITICAL_REGION_BEGIN(m_local_invoke_buff_lock);
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buff_out.swap(m_local_invoke_buff);
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m_local_invoke_buff.clear();
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CRITICAL_REGION_END();
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return m_invoke_res;
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}
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int notify(const GUID& target, int command, const std::string& in_buff)
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{
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if(!check_connection())
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return LEVIN_ERROR_CONNECTION_DESTROYED;
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bucket_head head = {0};
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head.m_signature = LEVIN_SIGNATURE;
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head.m_cb = in_buff.size();
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head.m_have_to_return_data = false;
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head.m_id = target;
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#ifdef TRACE_LEVIN_PACKETS_BY_GUIDS
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::UuidCreate(&head.m_id);
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#endif
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head.m_command = command;
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head.m_protocol_version = LEVIN_PROTOCOL_VER_1;
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head.m_flags = LEVIN_PACKET_REQUEST;
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CRITICAL_REGION_BEGIN(m_send_lock);
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LOG_PRINT_L4("[" << m_socket <<"] SEND " << sizeof(head));
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int res = ::send(m_socket, (const char*)&head, sizeof(head), 0);
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if(SOCKET_ERROR == res)
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{
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int err = ::WSAGetLastError();
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LOG_ERROR("Failed to send(), err = " << err << " \"" << socket_errors::get_socket_error_text(err) <<"\"");
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disconnect();
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return LEVIN_ERROR_CONNECTION_DESTROYED;
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}
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LOG_PRINT_L4("[" << m_socket <<"] SEND " << (int)in_buff.size());
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res = ::send(m_socket, in_buff.data(), (int)in_buff.size(), 0);
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if(SOCKET_ERROR == res)
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{
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int err = ::WSAGetLastError();
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LOG_ERROR("Failed to send(), err = " << err << " \"" << socket_errors::get_socket_error_text(err) <<"\"");
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disconnect();
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return LEVIN_ERROR_CONNECTION_DESTROYED;
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}
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CRITICAL_REGION_END();
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LOG_PRINT_L4("LEVIN_PACKET_SENT. [len=" << head.m_cb << ", flags=" << head.m_flags << ", is_cmd=" << head.m_have_to_return_data <<", cmd_id = " << head.m_command << ", pr_v=" << head.m_protocol_version << ", uid=" << string_tools::get_str_from_guid_a(head.m_id) << "]");
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return 1;
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}
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private:
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bool have_some_data(SOCKET sock, int interval = 1)
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{
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fd_set fds;
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FD_ZERO(&fds);
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FD_SET(sock, &fds);
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fd_set fdse;
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FD_ZERO(&fdse);
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FD_SET(sock, &fdse);
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timeval tv;
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tv.tv_sec = interval;
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tv.tv_usec = 0;
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int sel_res = select(0, &fds, 0, &fdse, &tv);
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if(0 == sel_res)
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return false;
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else if(sel_res == SOCKET_ERROR)
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{
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if(m_is_stop)
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return false;
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int err_code = ::WSAGetLastError();
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LOG_ERROR("Filed to call select, err code = " << err_code);
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disconnect();
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}else
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{
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if(fds.fd_array[0])
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{//some read operations was performed
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return true;
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}else if(fdse.fd_array[0])
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{//some error was at the socket
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return true;
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}
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}
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return false;
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}
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bool reciev_and_process_incoming_data()
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{
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bucket_head head = {0};
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uint32_t conn_index = 0;
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bool is_request = false;
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std::string local_buff;
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CRITICAL_REGION_BEGIN(m_reciev_packet_lock);//to protect from socket reconnect between head and body
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if(!recv_n(m_socket, (char*)&head, sizeof(head)))
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{
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if(m_is_stop)
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return false;
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LOG_ERROR("Failed to recv_n");
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return false;
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}
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conn_index = boost::interprocess::ipcdetail::atomic_read32(&m_current_connection_index);
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if(head.m_signature!=LEVIN_SIGNATURE)
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{
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LOG_ERROR("Signature missmatch in response");
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return false;
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}
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is_request = (head.m_protocol_version == LEVIN_PROTOCOL_VER_1 && head.m_flags&LEVIN_PACKET_REQUEST);
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local_buff.resize((size_t)head.m_cb);
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if(!recv_n(m_socket, local_buff))
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{
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if(m_is_stop)
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return false;
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LOG_ERROR("Filed to reciev");
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return false;
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}
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CRITICAL_REGION_END();
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LOG_PRINT_L4("LEVIN_PACKET_RECIEVED. [len=" << head.m_cb << ", flags=" << head.m_flags << ", is_cmd=" << head.m_have_to_return_data <<", cmd_id = " << head.m_command << ", pr_v=" << head.m_protocol_version << ", uid=" << string_tools::get_str_from_guid_a(head.m_id) << "]");
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if(is_request)
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{
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CRITICAL_REGION_BEGIN(m_recieved_packets_lock);
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m_recieved_packets.resize(m_recieved_packets.size() + 1);
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m_recieved_packets.back().m_hd = head;
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m_recieved_packets.back().m_body.swap(local_buff);
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m_recieved_packets.back().m_connection_index = conn_index;
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CRITICAL_REGION_END();
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/*
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*/
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}else
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{//this is some response
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CRITICAL_REGION_BEGIN(m_local_invoke_buff_lock);
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m_local_invoke_buff.swap(local_buff);
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m_invoke_res = head.m_return_code;
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CRITICAL_REGION_END();
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boost::interprocess::ipcdetail::atomic_write32(&m_invoke_data_ready, 1); //m_invoke_data_ready = true;
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m_invoke_cond.notify_all();
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}
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return true;
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}
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bool reciever_thread()
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{
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LOG_PRINT_L3("[" << m_socket <<"] Socket reciever thread started.[m_threads_count=" << m_threads_count << "]");
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log_space::log_singletone::set_thread_log_prefix("RECIEVER_WORKER");
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boost::interprocess::ipcdetail::atomic_inc32(&m_threads_count);
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while(!m_is_stop)
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{
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if(!m_connected)
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{
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Sleep(100);
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continue;
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}
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if(have_some_data(m_socket, 1))
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{
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if(!reciev_and_process_incoming_data())
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{
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if(m_is_stop)
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{
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break;//boost::interprocess::ipcdetail::atomic_dec32(&m_threads_count);
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//return true;
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}
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LOG_ERROR("Failed to reciev_and_process_incoming_data. shutting down");
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//boost::interprocess::ipcdetail::atomic_dec32(&m_threads_count);
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//disconnect_no_wait();
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//break;
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}
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}
|
|
}
|
|
|
|
boost::interprocess::ipcdetail::atomic_dec32(&m_threads_count);
|
|
LOG_PRINT_L3("[" << m_socket <<"] Socket reciever thread stopped.[m_threads_count=" << m_threads_count << "]");
|
|
return true;
|
|
}
|
|
|
|
bool process_recieved_packet(bucket_head& head, const std::string& local_buff, uint32_t conn_index)
|
|
{
|
|
|
|
net_utils::connection_context_base conn_context;
|
|
conn_context.m_remote_ip = m_ip;
|
|
conn_context.m_remote_port = m_port;
|
|
if(head.m_have_to_return_data)
|
|
{
|
|
std::string return_buff;
|
|
if(m_pcommands_handler)
|
|
head.m_return_code = m_pcommands_handler->invoke(head.m_id, head.m_command, local_buff, return_buff, conn_context);
|
|
else
|
|
head.m_return_code = LEVIN_ERROR_CONNECTION_HANDLER_NOT_DEFINED;
|
|
|
|
|
|
|
|
head.m_cb = return_buff.size();
|
|
head.m_have_to_return_data = false;
|
|
head.m_protocol_version = LEVIN_PROTOCOL_VER_1;
|
|
head.m_flags = LEVIN_PACKET_RESPONSE;
|
|
|
|
std::string send_buff((const char*)&head, sizeof(head));
|
|
send_buff += return_buff;
|
|
CRITICAL_REGION_BEGIN(m_send_lock);
|
|
if(conn_index != boost::interprocess::ipcdetail::atomic_read32(&m_current_connection_index))
|
|
{//there was reconnect, send response back is not allowed
|
|
return true;
|
|
}
|
|
int res = ::send(m_socket, (const char*)send_buff.data(), send_buff.size(), 0);
|
|
if(res == SOCKET_ERROR)
|
|
{
|
|
int err_code = ::WSAGetLastError();
|
|
LOG_ERROR("Failed to send, err = " << err_code);
|
|
return false;
|
|
}
|
|
CRITICAL_REGION_END();
|
|
LOG_PRINT_L4("LEVIN_PACKET_SENT. [len=" << head.m_cb << ", flags=" << head.m_flags << ", is_cmd=" << head.m_have_to_return_data <<", cmd_id = " << head.m_command << ", pr_v=" << head.m_protocol_version << ", uid=" << string_tools::get_str_from_guid_a(head.m_id) << "]");
|
|
|
|
}
|
|
else
|
|
{
|
|
if(m_pcommands_handler)
|
|
m_pcommands_handler->notify(head.m_id, head.m_command, local_buff, conn_context);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool handler_thread()
|
|
{
|
|
LOG_PRINT_L3("[" << m_socket <<"] Socket handler thread started.[m_threads_count=" << m_threads_count << "]");
|
|
log_space::log_singletone::set_thread_log_prefix("HANDLER_WORKER");
|
|
boost::interprocess::ipcdetail::atomic_inc32(&m_threads_count);
|
|
|
|
while(!m_is_stop)
|
|
{
|
|
bool have_some_work = false;
|
|
std::string local_buff;
|
|
bucket_head bh = {0};
|
|
uint32_t conn_index = 0;
|
|
|
|
CRITICAL_REGION_BEGIN(m_recieved_packets_lock);
|
|
if(m_recieved_packets.size())
|
|
{
|
|
bh = m_recieved_packets.begin()->m_hd;
|
|
conn_index = m_recieved_packets.begin()->m_connection_index;
|
|
local_buff.swap(m_recieved_packets.begin()->m_body);
|
|
have_some_work = true;
|
|
m_recieved_packets.pop_front();
|
|
}
|
|
CRITICAL_REGION_END();
|
|
|
|
if(have_some_work)
|
|
{
|
|
process_recieved_packet(bh, local_buff, conn_index);
|
|
}else
|
|
{
|
|
//Idle when no work
|
|
Sleep(30);
|
|
}
|
|
}
|
|
|
|
boost::interprocess::ipcdetail::atomic_dec32(&m_threads_count);
|
|
LOG_PRINT_L3("[" << m_socket <<"] Socket handler thread stopped.[m_threads_count=" << m_threads_count << "]");
|
|
return true;
|
|
}
|
|
};
|
|
|
|
}
|
|
} |