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monero/contrib/epee/include/net/levin_client_async.h
moneromooo-monero 072102cfd2
abstracted nework addresses 
All code which was using ip and port now uses a new IPv4 object,
subclass of a new network_address class. This will allow easy
addition of I2P addresses later (and also IPv6, etc).
Both old style and new style peer lists are now sent in the P2P
protocol, which is inefficient but allows peers using both
codebases to talk to each other. This will be removed in the
future. No other subclasses than IPv4 exist yet.
2017-05-27 11:35:54 +01:00

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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"
#undef MONERO_DEFAULT_LOG_CATEGORY
#define MONERO_DEFAULT_LOG_CATEGORY "net"
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_address = m_address;
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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