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monero/contrib/epee/include/net/levin_client_async.h
Riccardo Spagni f4b69d553a
year updated in license
2015-01-02 18:52:46 +02:00

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