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monero/contrib/epee/include/net/levin_protocol_handler_async.h
moneromooo-monero cd929b89b0
levin: fix wrong value passed as return code to remote call 
When receiving an answer packet, the command code was passed
to the callback instead of the error code. This was hiding
the "command not found" failure from the peer, and in turn
causing the code to attempt to deserialize a non existent
reply string.
2016-11-12 10:12:23 +00:00

813 lines
30 KiB
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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/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>
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;
};
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_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())
{
m_timer.expires_from_now(boost::posix_time::milliseconds(timeout));
m_timer.async_wait([&con, command, cb](const boost::system::error_code& ec)
{
if(ec == boost::asio::error::operation_aborted)
return;
LOG_PRINT_CC(con.get_context_ref(), "Timeout on invoke operation happened, command: " << command, LOG_LEVEL_2);
std::string fake;
cb(LEVIN_ERROR_CONNECTION_TIMEDOUT, fake, con.get_context_ref());
con.close();
con.finish_outer_call();
});
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;
int m_command;
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;
}
};
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);
LOG_PRINT_CC(m_connection_context, "~async_protocol_handler()", LOG_LEVEL_4);
}
bool start_outer_call()
{
LOG_PRINT_CC_L4(m_connection_context, "[levin_protocol] -->> start_outer_call");
if(!m_pservice_endpoint->add_ref())
{
LOG_PRINT_CC_RED(m_connection_context, "[levin_protocol] -->> start_outer_call failed", LOG_LEVEL_4);
return false;
}
boost::interprocess::ipcdetail::atomic_inc32(&m_wait_count);
return true;
}
bool finish_outer_call()
{
LOG_PRINT_CC_L4(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)
{
LOG_ERROR_CC(m_connection_context, "Commands handler not set!");
return false;
}
if(m_cache_in_buffer.size() + 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 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;
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);
LOG_PRINT_CC_L4(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))
{
LOG_ERROR_CC(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();
LOG_PRINT_CC_L4(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)
{
LOG_ERROR_CC(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();
LOG_PRINT_CC_L4(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();
while(!boost::interprocess::ipcdetail::atomic_read32(&m_invoke_buf_ready) && !m_deletion_initiated && !m_protocol_released)
{
if(misc_utils::get_tick_count() - ticks_start > m_config.m_invoke_timeout)
{
LOG_PRINT_CC_L2(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_PRINT_CC_L4(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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