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wownero/contrib/epee/include/net/levin_protocol_handler_async.h
Howard Chu cf3a376cb5
Don't timeout a slow operation that's making progress 
If we got at least MIN_BYTES_WANTED (default 512) during any network
poll, reset the timeout to allow more time for data to arrive.
2017-06-15 16:54:03 +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 <boost/asio/deadline_timer.hpp>
#include <boost/uuid/uuid_generators.hpp>
#include <boost/unordered_map.hpp>
#include <boost/interprocess/detail/atomic.hpp>
#include <boost/smart_ptr/make_shared.hpp>
#include <atomic>
#include "levin_base.h"
#include "misc_language.h"
#include <random>
#include <chrono>
#undef MONERO_DEFAULT_LOG_CATEGORY
#define MONERO_DEFAULT_LOG_CATEGORY "net"
#ifndef MIN_BYTES_WANTED
#define MIN_BYTES_WANTED 512
#endif
namespace epee
{
namespace levin
{
/************************************************************************/
/* */
/************************************************************************/
template<class t_connection_context>
class async_protocol_handler;
template<class t_connection_context>
class async_protocol_handler_config
{
typedef boost::unordered_map<boost::uuids::uuid, async_protocol_handler<t_connection_context>* > connections_map;
critical_section m_connects_lock;
connections_map m_connects;
void add_connection(async_protocol_handler<t_connection_context>* pc);
void del_connection(async_protocol_handler<t_connection_context>* pc);
async_protocol_handler<t_connection_context>* find_connection(boost::uuids::uuid connection_id) const;
int find_and_lock_connection(boost::uuids::uuid connection_id, async_protocol_handler<t_connection_context>*& aph);
friend class async_protocol_handler<t_connection_context>;
public:
typedef t_connection_context connection_context;
levin_commands_handler<t_connection_context>* m_pcommands_handler;
uint64_t m_max_packet_size;
uint64_t m_invoke_timeout;
int invoke(int command, const std::string& in_buff, std::string& buff_out, boost::uuids::uuid connection_id);
template<class callback_t>
int invoke_async(int command, const std::string& in_buff, boost::uuids::uuid connection_id, callback_t cb, size_t timeout = LEVIN_DEFAULT_TIMEOUT_PRECONFIGURED);
int notify(int command, const std::string& in_buff, boost::uuids::uuid connection_id);
bool close(boost::uuids::uuid connection_id);
bool update_connection_context(const t_connection_context& contxt);
bool request_callback(boost::uuids::uuid connection_id);
template<class callback_t>
bool foreach_connection(callback_t cb);
size_t get_connections_count();
async_protocol_handler_config():m_pcommands_handler(NULL), m_max_packet_size(LEVIN_DEFAULT_MAX_PACKET_SIZE)
{}
void del_out_connections(size_t count);
};
/************************************************************************/
/* */
/************************************************************************/
template<class t_connection_context = net_utils::connection_context_base>
class async_protocol_handler
{
public:
typedef t_connection_context connection_context;
typedef async_protocol_handler_config<t_connection_context> config_type;
enum stream_state
{
stream_state_head,
stream_state_body
};
std::atomic<bool> m_deletion_initiated;
std::atomic<bool> m_protocol_released;
volatile uint32_t m_invoke_buf_ready;
volatile int m_invoke_result_code;
critical_section m_local_inv_buff_lock;
std::string m_local_inv_buff;
critical_section m_send_lock;
critical_section m_call_lock;
volatile uint32_t m_wait_count;
volatile uint32_t m_close_called;
bucket_head2 m_current_head;
net_utils::i_service_endpoint* m_pservice_endpoint;
config_type& m_config;
t_connection_context& m_connection_context;
std::string m_cache_in_buffer;
stream_state m_state;
int32_t m_oponent_protocol_ver;
bool m_connection_initialized;
struct invoke_response_handler_base
{
virtual bool handle(int res, const std::string& buff, connection_context& context)=0;
virtual bool is_timer_started() const=0;
virtual void cancel()=0;
virtual bool cancel_timer()=0;
virtual void reset_timer()=0;
virtual void timeout_handler(const boost::system::error_code& error)=0;
};
template <class callback_t>
struct anvoke_handler: invoke_response_handler_base
{
anvoke_handler(const callback_t& cb, uint64_t timeout, async_protocol_handler& con, int command)
:m_cb(cb), m_timeout(timeout), m_con(con), m_timer(con.m_pservice_endpoint->get_io_service()), m_timer_started(false),
m_cancel_timer_called(false), m_timer_cancelled(false), m_command(command)
{
if(m_con.start_outer_call())
{
MDEBUG(con.get_context_ref() << "anvoke_handler, timeout: " << timeout);
m_timer.expires_from_now(boost::posix_time::milliseconds(timeout));
m_timer.async_wait([this](const boost::system::error_code& ec)
{
timeout_handler(ec);
});
m_timer_started = true;
}
}
virtual ~anvoke_handler()
{}
callback_t m_cb;
async_protocol_handler& m_con;
boost::asio::deadline_timer m_timer;
bool m_timer_started;
bool m_cancel_timer_called;
bool m_timer_cancelled;
uint64_t m_timeout;
int m_command;
virtual void timeout_handler(const boost::system::error_code& error)
{
if(error == boost::asio::error::operation_aborted)
return;
MINFO(m_con.get_context_ref() << "Timeout on invoke operation happened, command: " << m_command << " timeout: " << m_timeout);
std::string fake;
m_cb(LEVIN_ERROR_CONNECTION_TIMEDOUT, fake, m_con.get_context_ref());
m_con.close();
m_con.finish_outer_call();
}
virtual bool handle(int res, const std::string& buff, typename async_protocol_handler::connection_context& context)
{
if(!cancel_timer())
return false;
m_cb(res, buff, context);
m_con.finish_outer_call();
return true;
}
virtual bool is_timer_started() const
{
return m_timer_started;
}
virtual void cancel()
{
if(cancel_timer())
{
std::string fake;
m_cb(LEVIN_ERROR_CONNECTION_DESTROYED, fake, m_con.get_context_ref());
m_con.finish_outer_call();
}
}
virtual bool cancel_timer()
{
if(!m_cancel_timer_called)
{
m_cancel_timer_called = true;
boost::system::error_code ignored_ec;
m_timer_cancelled = 1 == m_timer.cancel(ignored_ec);
}
return m_timer_cancelled;
}
virtual void reset_timer()
{
boost::system::error_code ignored_ec;
if (!m_cancel_timer_called && m_timer.cancel(ignored_ec) > 0)
{
m_timer.expires_from_now(boost::posix_time::milliseconds(m_timeout));
m_timer.async_wait([this](const boost::system::error_code& ec)
{
timeout_handler(ec);
});
}
}
};
critical_section m_invoke_response_handlers_lock;
std::list<boost::shared_ptr<invoke_response_handler_base> > m_invoke_response_handlers;
template<class callback_t>
bool add_invoke_response_handler(callback_t cb, uint64_t timeout, async_protocol_handler& con, int command)
{
CRITICAL_REGION_LOCAL(m_invoke_response_handlers_lock);
boost::shared_ptr<invoke_response_handler_base> handler(boost::make_shared<anvoke_handler<callback_t>>(cb, timeout, con, command));
m_invoke_response_handlers.push_back(handler);
return handler->is_timer_started();
}
template<class callback_t> friend struct anvoke_handler;
public:
async_protocol_handler(net_utils::i_service_endpoint* psnd_hndlr,
config_type& config,
t_connection_context& conn_context):
m_current_head(bucket_head2()),
m_pservice_endpoint(psnd_hndlr),
m_config(config),
m_connection_context(conn_context),
m_state(stream_state_head)
{
m_close_called = 0;
m_deletion_initiated = false;
m_protocol_released = false;
m_wait_count = 0;
m_oponent_protocol_ver = 0;
m_connection_initialized = false;
}
virtual ~async_protocol_handler()
{
m_deletion_initiated = true;
if(m_connection_initialized)
{
m_config.del_connection(this);
}
for (size_t i = 0; i < 60 * 1000 / 100 && 0 != boost::interprocess::ipcdetail::atomic_read32(&m_wait_count); ++i)
{
misc_utils::sleep_no_w(100);
}
CHECK_AND_ASSERT_MES_NO_RET(0 == boost::interprocess::ipcdetail::atomic_read32(&m_wait_count), "Failed to wait for operation completion. m_wait_count = " << m_wait_count);
MTRACE(m_connection_context << "~async_protocol_handler()");
}
bool start_outer_call()
{
MTRACE(m_connection_context << "[levin_protocol] -->> start_outer_call");
if(!m_pservice_endpoint->add_ref())
{
MERROR(m_connection_context << "[levin_protocol] -->> start_outer_call failed");
return false;
}
boost::interprocess::ipcdetail::atomic_inc32(&m_wait_count);
return true;
}
bool finish_outer_call()
{
MTRACE(m_connection_context << "[levin_protocol] <<-- finish_outer_call");
boost::interprocess::ipcdetail::atomic_dec32(&m_wait_count);
m_pservice_endpoint->release();
return true;
}
bool release_protocol()
{
decltype(m_invoke_response_handlers) local_invoke_response_handlers;
CRITICAL_REGION_BEGIN(m_invoke_response_handlers_lock);
local_invoke_response_handlers.swap(m_invoke_response_handlers);
m_protocol_released = true;
CRITICAL_REGION_END();
// Never call callback inside critical section, that can cause deadlock. Callback can be called when
// invoke_response_handler_base is cancelled
std::for_each(local_invoke_response_handlers.begin(), local_invoke_response_handlers.end(), [](const boost::shared_ptr<invoke_response_handler_base>& pinv_resp_hndlr) {
pinv_resp_hndlr->cancel();
});
return true;
}
bool close()
{
boost::interprocess::ipcdetail::atomic_inc32(&m_close_called);
m_pservice_endpoint->close();
return true;
}
void update_connection_context(const connection_context& contxt)
{
m_connection_context = contxt;
}
void request_callback()
{
misc_utils::auto_scope_leave_caller scope_exit_handler = misc_utils::create_scope_leave_handler(
boost::bind(&async_protocol_handler::finish_outer_call, this));
m_pservice_endpoint->request_callback();
}
void handle_qued_callback()
{
m_config.m_pcommands_handler->callback(m_connection_context);
}
virtual bool handle_recv(const void* ptr, size_t cb)
{
if(boost::interprocess::ipcdetail::atomic_read32(&m_close_called))
return false; //closing connections
if(!m_config.m_pcommands_handler)
{
MERROR(m_connection_context << "Commands handler not set!");
return false;
}
if(m_cache_in_buffer.size() + cb > m_config.m_max_packet_size)
{
MWARNING(m_connection_context << "Maximum packet size exceed!, m_max_packet_size = " << m_config.m_max_packet_size
<< ", packet received " << m_cache_in_buffer.size() + cb
<< ", connection will be closed.");
return false;
}
m_cache_in_buffer.append((const char*)ptr, cb);
bool is_continue = true;
while(is_continue)
{
switch(m_state)
{
case stream_state_body:
if(m_cache_in_buffer.size() < m_current_head.m_cb)
{
is_continue = false;
if(cb >= MIN_BYTES_WANTED && !m_invoke_response_handlers.empty())
{
//async call scenario
boost::shared_ptr<invoke_response_handler_base> response_handler = m_invoke_response_handlers.front();
response_handler->reset_timer();
MDEBUG(m_connection_context << "LEVIN_PACKET partial msg received. len=" << cb);
}
break;
}
{
std::string buff_to_invoke;
if(m_cache_in_buffer.size() == m_current_head.m_cb)
buff_to_invoke.swap(m_cache_in_buffer);
else
{
buff_to_invoke.assign(m_cache_in_buffer, 0, (std::string::size_type)m_current_head.m_cb);
m_cache_in_buffer.erase(0, (std::string::size_type)m_current_head.m_cb);
}
bool is_response = (m_oponent_protocol_ver == LEVIN_PROTOCOL_VER_1 && m_current_head.m_flags&LEVIN_PACKET_RESPONSE);
MDEBUG(m_connection_context << "LEVIN_PACKET_RECIEVED. [len=" << m_current_head.m_cb
<< ", flags" << m_current_head.m_flags
<< ", r?=" << m_current_head.m_have_to_return_data
<<", cmd = " << m_current_head.m_command
<< ", v=" << m_current_head.m_protocol_version);
if(is_response)
{//response to some invoke
epee::critical_region_t<decltype(m_invoke_response_handlers_lock)> invoke_response_handlers_guard(m_invoke_response_handlers_lock);
if(!m_invoke_response_handlers.empty())
{//async call scenario
boost::shared_ptr<invoke_response_handler_base> response_handler = m_invoke_response_handlers.front();
bool timer_cancelled = response_handler->cancel_timer();
// Don't pop handler, to avoid destroying it
if(timer_cancelled)
m_invoke_response_handlers.pop_front();
invoke_response_handlers_guard.unlock();
if(timer_cancelled)
response_handler->handle(m_current_head.m_return_code, buff_to_invoke, m_connection_context);
}
else
{
invoke_response_handlers_guard.unlock();
//use sync call scenario
if(!boost::interprocess::ipcdetail::atomic_read32(&m_wait_count) && !boost::interprocess::ipcdetail::atomic_read32(&m_close_called))
{
MERROR(m_connection_context << "no active invoke when response came, wtf?");
return false;
}else
{
CRITICAL_REGION_BEGIN(m_local_inv_buff_lock);
buff_to_invoke.swap(m_local_inv_buff);
buff_to_invoke.clear();
m_invoke_result_code = m_current_head.m_return_code;
CRITICAL_REGION_END();
boost::interprocess::ipcdetail::atomic_write32(&m_invoke_buf_ready, 1);
}
}
}else
{
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_connection_context);
m_current_head.m_cb = return_buff.size();
m_current_head.m_have_to_return_data = false;
m_current_head.m_protocol_version = LEVIN_PROTOCOL_VER_1;
m_current_head.m_flags = LEVIN_PACKET_RESPONSE;
std::string send_buff((const char*)&m_current_head, sizeof(m_current_head));
send_buff += return_buff;
CRITICAL_REGION_BEGIN(m_send_lock);
if(!m_pservice_endpoint->do_send(send_buff.data(), send_buff.size()))
return false;
CRITICAL_REGION_END();
MDEBUG(m_connection_context << "LEVIN_PACKET_SENT. [len=" << m_current_head.m_cb
<< ", flags" << m_current_head.m_flags
<< ", r?=" << m_current_head.m_have_to_return_data
<<", cmd = " << m_current_head.m_command
<< ", ver=" << m_current_head.m_protocol_version);
}
else
m_config.m_pcommands_handler->notify(m_current_head.m_command, buff_to_invoke, m_connection_context);
}
}
m_state = stream_state_head;
break;
case stream_state_head:
{
if(m_cache_in_buffer.size() < sizeof(bucket_head2))
{
if(m_cache_in_buffer.size() >= sizeof(uint64_t) && *((uint64_t*)m_cache_in_buffer.data()) != LEVIN_SIGNATURE)
{
MWARNING(m_connection_context << "Signature mismatch, connection will be closed");
return false;
}
is_continue = false;
break;
}
bucket_head2* phead = (bucket_head2*)m_cache_in_buffer.data();
if(LEVIN_SIGNATURE != phead->m_signature)
{
LOG_ERROR_CC(m_connection_context, "Signature mismatch, connection will be closed");
return false;
}
m_current_head = *phead;
m_cache_in_buffer.erase(0, sizeof(bucket_head2));
m_state = stream_state_body;
m_oponent_protocol_ver = m_current_head.m_protocol_version;
if(m_current_head.m_cb > m_config.m_max_packet_size)
{
LOG_ERROR_CC(m_connection_context, "Maximum packet size exceed!, m_max_packet_size = " << m_config.m_max_packet_size
<< ", packet header received " << m_current_head.m_cb
<< ", connection will be closed.");
return false;
}
}
break;
default:
LOG_ERROR_CC(m_connection_context, "Undefined state in levin_server_impl::connection_handler, m_state=" << m_state);
return false;
}
}
return true;
}
bool after_init_connection()
{
if (!m_connection_initialized)
{
m_connection_initialized = true;
m_config.add_connection(this);
}
return true;
}
template<class callback_t>
bool async_invoke(int command, const std::string& in_buff, callback_t cb, size_t timeout = LEVIN_DEFAULT_TIMEOUT_PRECONFIGURED)
{
misc_utils::auto_scope_leave_caller scope_exit_handler = misc_utils::create_scope_leave_handler(
boost::bind(&async_protocol_handler::finish_outer_call, this));
if(timeout == LEVIN_DEFAULT_TIMEOUT_PRECONFIGURED)
timeout = m_config.m_invoke_timeout;
int err_code = LEVIN_OK;
do
{
if(m_deletion_initiated)
{
err_code = LEVIN_ERROR_CONNECTION_DESTROYED;
break;
}
CRITICAL_REGION_LOCAL(m_call_lock);
if(m_deletion_initiated)
{
err_code = LEVIN_ERROR_CONNECTION_DESTROYED;
break;
}
bucket_head2 head = {0};
head.m_signature = LEVIN_SIGNATURE;
head.m_cb = in_buff.size();
head.m_have_to_return_data = true;
head.m_flags = LEVIN_PACKET_REQUEST;
head.m_command = command;
head.m_protocol_version = LEVIN_PROTOCOL_VER_1;
boost::interprocess::ipcdetail::atomic_write32(&m_invoke_buf_ready, 0);
CRITICAL_REGION_BEGIN(m_send_lock);
CRITICAL_REGION_LOCAL1(m_invoke_response_handlers_lock);
if(!m_pservice_endpoint->do_send(&head, sizeof(head)))
{
LOG_ERROR_CC(m_connection_context, "Failed to do_send");
err_code = LEVIN_ERROR_CONNECTION;
break;
}
if(!m_pservice_endpoint->do_send(in_buff.data(), (int)in_buff.size()))
{
LOG_ERROR_CC(m_connection_context, "Failed to do_send");
err_code = LEVIN_ERROR_CONNECTION;
break;
}
if(!add_invoke_response_handler(cb, timeout, *this, command))
{
err_code = LEVIN_ERROR_CONNECTION_DESTROYED;
break;
}
CRITICAL_REGION_END();
} while (false);
if (LEVIN_OK != err_code)
{
std::string stub_buff;
// Never call callback inside critical section, that can cause deadlock
cb(err_code, stub_buff, m_connection_context);
return false;
}
return true;
}
int invoke(int command, const std::string& in_buff, std::string& buff_out)
{
misc_utils::auto_scope_leave_caller scope_exit_handler = misc_utils::create_scope_leave_handler(
boost::bind(&async_protocol_handler::finish_outer_call, this));
if(m_deletion_initiated)
return LEVIN_ERROR_CONNECTION_DESTROYED;
CRITICAL_REGION_LOCAL(m_call_lock);
if(m_deletion_initiated)
return LEVIN_ERROR_CONNECTION_DESTROYED;
bucket_head2 head = {0};
head.m_signature = LEVIN_SIGNATURE;
head.m_cb = in_buff.size();
head.m_have_to_return_data = true;
head.m_flags = LEVIN_PACKET_REQUEST;
head.m_command = command;
head.m_protocol_version = LEVIN_PROTOCOL_VER_1;
boost::interprocess::ipcdetail::atomic_write32(&m_invoke_buf_ready, 0);
CRITICAL_REGION_BEGIN(m_send_lock);
if(!m_pservice_endpoint->do_send(&head, sizeof(head)))
{
LOG_ERROR_CC(m_connection_context, "Failed to do_send");
return LEVIN_ERROR_CONNECTION;
}
if(!m_pservice_endpoint->do_send(in_buff.data(), (int)in_buff.size()))
{
LOG_ERROR_CC(m_connection_context, "Failed to do_send");
return LEVIN_ERROR_CONNECTION;
}
CRITICAL_REGION_END();
MDEBUG(m_connection_context << "LEVIN_PACKET_SENT. [len=" << head.m_cb
<< ", f=" << head.m_flags
<< ", r?=" << head.m_have_to_return_data
<< ", cmd = " << head.m_command
<< ", ver=" << head.m_protocol_version);
uint64_t ticks_start = misc_utils::get_tick_count();
size_t prev_size = 0;
while(!boost::interprocess::ipcdetail::atomic_read32(&m_invoke_buf_ready) && !m_deletion_initiated && !m_protocol_released)
{
if(m_cache_in_buffer.size() - prev_size >= MIN_BYTES_WANTED)
{
prev_size = m_cache_in_buffer.size();
ticks_start = misc_utils::get_tick_count();
}
if(misc_utils::get_tick_count() - ticks_start > m_config.m_invoke_timeout)
{
MWARNING(m_connection_context << "invoke timeout (" << m_config.m_invoke_timeout << "), closing connection ");
close();
return LEVIN_ERROR_CONNECTION_TIMEDOUT;
}
if(!m_pservice_endpoint->call_run_once_service_io())
return LEVIN_ERROR_CONNECTION_DESTROYED;
}
if(m_deletion_initiated || m_protocol_released)
return LEVIN_ERROR_CONNECTION_DESTROYED;
CRITICAL_REGION_BEGIN(m_local_inv_buff_lock);
buff_out.swap(m_local_inv_buff);
m_local_inv_buff.clear();
CRITICAL_REGION_END();
return m_invoke_result_code;
}
int notify(int command, const std::string& in_buff)
{
misc_utils::auto_scope_leave_caller scope_exit_handler = misc_utils::create_scope_leave_handler(
boost::bind(&async_protocol_handler::finish_outer_call, this));
if(m_deletion_initiated)
return LEVIN_ERROR_CONNECTION_DESTROYED;
CRITICAL_REGION_LOCAL(m_call_lock);
if(m_deletion_initiated)
return LEVIN_ERROR_CONNECTION_DESTROYED;
bucket_head2 head = {0};
head.m_signature = LEVIN_SIGNATURE;
head.m_have_to_return_data = false;
head.m_cb = in_buff.size();
head.m_command = command;
head.m_protocol_version = LEVIN_PROTOCOL_VER_1;
head.m_flags = LEVIN_PACKET_REQUEST;
CRITICAL_REGION_BEGIN(m_send_lock);
if(!m_pservice_endpoint->do_send(&head, sizeof(head)))
{
LOG_ERROR_CC(m_connection_context, "Failed to do_send()");
return -1;
}
if(!m_pservice_endpoint->do_send(in_buff.data(), (int)in_buff.size()))
{
LOG_ERROR_CC(m_connection_context, "Failed to do_send()");
return -1;
}
CRITICAL_REGION_END();
LOG_DEBUG_CC(m_connection_context, "LEVIN_PACKET_SENT. [len=" << head.m_cb <<
", f=" << head.m_flags <<
", r?=" << head.m_have_to_return_data <<
", cmd = " << head.m_command <<
", ver=" << head.m_protocol_version);
return 1;
}
//------------------------------------------------------------------------------------------
boost::uuids::uuid get_connection_id() {return m_connection_context.m_connection_id;}
//------------------------------------------------------------------------------------------
t_connection_context& get_context_ref() {return m_connection_context;}
};
//------------------------------------------------------------------------------------------
template<class t_connection_context>
void async_protocol_handler_config<t_connection_context>::del_connection(async_protocol_handler<t_connection_context>* pconn)
{
CRITICAL_REGION_BEGIN(m_connects_lock);
m_connects.erase(pconn->get_connection_id());
CRITICAL_REGION_END();
m_pcommands_handler->on_connection_close(pconn->m_connection_context);
}
//------------------------------------------------------------------------------------------
template<class t_connection_context>
void async_protocol_handler_config<t_connection_context>::del_out_connections(size_t count)
{
std::vector <boost::uuids::uuid> out_connections;
CRITICAL_REGION_BEGIN(m_connects_lock);
for (auto& c: m_connects)
{
if (!c.second->m_connection_context.m_is_income)
out_connections.push_back(c.first);
}
if (out_connections.size() == 0)
return;
// close random out connections
// TODO or better just keep removing random elements (performance)
unsigned seed = std::chrono::system_clock::now().time_since_epoch().count();
shuffle(out_connections.begin(), out_connections.end(), std::default_random_engine(seed));
while (count > 0 && out_connections.size() > 0)
{
close(*out_connections.begin());
del_connection(m_connects.at(*out_connections.begin()));
out_connections.erase(out_connections.begin());
--count;
}
CRITICAL_REGION_END();
}
//------------------------------------------------------------------------------------------
template<class t_connection_context>
void async_protocol_handler_config<t_connection_context>::add_connection(async_protocol_handler<t_connection_context>* pconn)
{
CRITICAL_REGION_BEGIN(m_connects_lock);
m_connects[pconn->get_connection_id()] = pconn;
CRITICAL_REGION_END();
m_pcommands_handler->on_connection_new(pconn->m_connection_context);
}
//------------------------------------------------------------------------------------------
template<class t_connection_context>
async_protocol_handler<t_connection_context>* async_protocol_handler_config<t_connection_context>::find_connection(boost::uuids::uuid connection_id) const
{
auto it = m_connects.find(connection_id);
return it == m_connects.end() ? 0 : it->second;
}
//------------------------------------------------------------------------------------------
template<class t_connection_context>
int async_protocol_handler_config<t_connection_context>::find_and_lock_connection(boost::uuids::uuid connection_id, async_protocol_handler<t_connection_context>*& aph)
{
CRITICAL_REGION_LOCAL(m_connects_lock);
aph = find_connection(connection_id);
if(0 == aph)
return LEVIN_ERROR_CONNECTION_NOT_FOUND;
if(!aph->start_outer_call())
return LEVIN_ERROR_CONNECTION_DESTROYED;
return LEVIN_OK;
}
//------------------------------------------------------------------------------------------
template<class t_connection_context>
int async_protocol_handler_config<t_connection_context>::invoke(int command, const std::string& in_buff, std::string& buff_out, boost::uuids::uuid connection_id)
{
async_protocol_handler<t_connection_context>* aph;
int r = find_and_lock_connection(connection_id, aph);
return LEVIN_OK == r ? aph->invoke(command, in_buff, buff_out) : r;
}
//------------------------------------------------------------------------------------------
template<class t_connection_context> template<class callback_t>
int async_protocol_handler_config<t_connection_context>::invoke_async(int command, const std::string& in_buff, boost::uuids::uuid connection_id, callback_t cb, size_t timeout)
{
async_protocol_handler<t_connection_context>* aph;
int r = find_and_lock_connection(connection_id, aph);
return LEVIN_OK == r ? aph->async_invoke(command, in_buff, cb, timeout) : r;
}
//------------------------------------------------------------------------------------------
template<class t_connection_context> template<class callback_t>
bool async_protocol_handler_config<t_connection_context>::foreach_connection(callback_t cb)
{
CRITICAL_REGION_LOCAL(m_connects_lock);
for(auto& c: m_connects)
{
async_protocol_handler<t_connection_context>* aph = c.second;
if(!cb(aph->get_context_ref()))
return false;
}
return true;
}
//------------------------------------------------------------------------------------------
template<class t_connection_context>
size_t async_protocol_handler_config<t_connection_context>::get_connections_count()
{
CRITICAL_REGION_LOCAL(m_connects_lock);
return m_connects.size();
}
//------------------------------------------------------------------------------------------
template<class t_connection_context>
int async_protocol_handler_config<t_connection_context>::notify(int command, const std::string& in_buff, boost::uuids::uuid connection_id)
{
async_protocol_handler<t_connection_context>* aph;
int r = find_and_lock_connection(connection_id, aph);
return LEVIN_OK == r ? aph->notify(command, in_buff) : r;
}
//------------------------------------------------------------------------------------------
template<class t_connection_context>
bool async_protocol_handler_config<t_connection_context>::close(boost::uuids::uuid connection_id)
{
CRITICAL_REGION_LOCAL(m_connects_lock);
async_protocol_handler<t_connection_context>* aph = find_connection(connection_id);
return 0 != aph ? aph->close() : false;
}
//------------------------------------------------------------------------------------------
template<class t_connection_context>
bool async_protocol_handler_config<t_connection_context>::update_connection_context(const t_connection_context& contxt)
{
CRITICAL_REGION_LOCAL(m_connects_lock);
async_protocol_handler<t_connection_context>* aph = find_connection(contxt.m_connection_id);
if(0 == aph)
return false;
aph->update_connection_context(contxt);
return true;
}
//------------------------------------------------------------------------------------------
template<class t_connection_context>
bool async_protocol_handler_config<t_connection_context>::request_callback(boost::uuids::uuid connection_id)
{
async_protocol_handler<t_connection_context>* aph;
int r = find_and_lock_connection(connection_id, aph);
if(LEVIN_OK == r)
{
aph->request_callback();
return true;
}
else
{
return false;
}
}
}
}
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