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TcpSocket.cpp
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <SFNUL/TcpSocket.hpp>
#include <SFNUL/ConfigInternal.hpp>
#include <SFNUL/Utility.hpp>
#include <SFNUL/Endpoint.hpp>
#include <SFNUL/Message.hpp>
#include <SFNUL/IpAddressImpl.hpp>
#include <SFNUL/MakeUnique.hpp>
#include <asio/buffer.hpp>
#include <asio/ip/tcp.hpp>
#include <asio/strand.hpp>
#include <functional>
#include <algorithm>
namespace {
struct TcpSocketMaker : public sfn::TcpSocket {};
}
namespace sfn {
class TcpSocket::TcpSocketImpl {
public:
TcpSocketImpl( TcpSocket* owner ) :
tcp_socket{ owner },
asio_socket{ *static_cast<asio::io_context*>( owner->GetIOService() ) }
{
}
void SendHandler( const asio::error_code& error, std::size_t bytes_sent ) {
{
auto lock = tcp_socket->AcquireLock();
if( sending ) {
return;
}
if( ( error == asio::error::operation_aborted ) || ( error == asio::error::connection_aborted ) || ( error == asio::error::connection_reset ) ) {
return;
}
else if( error ) {
ErrorMessage() << "Async Send Error: " << error.message() << "\n";
return;
}
send_buffer.erase( send_buffer.begin(), send_buffer.begin() + static_cast<int>( bytes_sent ) );
if( send_buffer.empty() ) {
if( request_shutdown && !fin_sent && asio_socket.is_open() ) {
asio::error_code shutdown_error;
asio_socket.shutdown( asio::ip::tcp::socket::shutdown_send, shutdown_error );
if( ( shutdown_error == asio::error::connection_aborted ) || ( shutdown_error == asio::error::connection_reset ) ) {
fin_received = true;
fin_sent = true;
tcp_socket->Close();
}
else if( error == asio::error::not_connected ) {
}
else if( shutdown_error ) {
ErrorMessage() << "Shutdown() Error: " << shutdown_error.message() << "\n";
}
else {
fin_sent = true;
}
}
}
else {
auto send_size = std::min( send_memory.size(), send_buffer.size() );
std::copy_n( send_buffer.begin(), send_size, send_memory.begin() );
if( connected && !fin_sent ) {
sending = true;
asio_socket.async_send( asio::buffer( send_memory, send_size ),
static_cast<asio::io_context::strand*>( tcp_socket->GetStrand() )->wrap(
std::bind(
[]( std::weak_ptr<TcpSocket> socket, const asio::error_code& handler_error, std::size_t handler_bytes_sent ) {
auto shared_socket = socket.lock();
if( !shared_socket ) {
return;
}
auto handler_lock = shared_socket->AcquireLock();
shared_socket->m_impl->sending = false;
if( !shared_socket->m_impl->send_buffer.empty() ) {
shared_socket->m_impl->SendHandler( handler_error, handler_bytes_sent );
}
},
std::weak_ptr<TcpSocket>( tcp_socket->shared_from_this() ), std::placeholders::_1, std::placeholders::_2
)
)
);
}
}
}
if( bytes_sent ) {
tcp_socket->OnSent();
}
}
void ReceiveHandler( const asio::error_code& error, std::size_t bytes_received ) {
{
auto lock = tcp_socket->AcquireLock();
if( receiving ) {
return;
}
if( error == asio::error::operation_aborted ) {
return;
}
else if( ( error == asio::error::connection_aborted ) || ( error == asio::error::connection_reset ) ) {
fin_received = true;
fin_sent = true;
send_buffer.clear();
tcp_socket->Close();
}
else if( error == asio::error::eof ) {
fin_received = true;
}
else if( error ) {
ErrorMessage() << "Async Receive Error: " << error.message() << "\n";
return;
}
receive_buffer.insert( receive_buffer.end(), receive_memory.begin(), receive_memory.begin() + bytes_received );
if( connected && !fin_received && ( receive_buffer.size() < GetMaximumBlockSize() ) ) {
receiving = true;
asio_socket.async_receive( asio::buffer( receive_memory ),
static_cast<asio::io_context::strand*>( tcp_socket->GetStrand() )->wrap(
std::bind(
[]( std::weak_ptr<TcpSocket> socket, const asio::error_code& handler_error, std::size_t handler_bytes_received ) {
auto shared_socket = socket.lock();
if( !shared_socket ) {
return;
}
auto handler_lock = shared_socket->AcquireLock();
shared_socket->m_impl->receiving = false;
shared_socket->m_impl->ReceiveHandler( handler_error, handler_bytes_received );
},
std::weak_ptr<TcpSocket>( tcp_socket->shared_from_this() ), std::placeholders::_1, std::placeholders::_2
)
)
);
}
}
if( bytes_received ) {
tcp_socket->OnReceived();
}
}
TcpSocket* tcp_socket;
asio::ip::tcp::socket asio_socket;
std::vector<char> send_buffer;
std::vector<char> receive_buffer;
std::array<char, 2048> send_memory;
std::array<char, 2048> receive_memory;
bool connected = false;
bool request_shutdown = false;
bool fin_sent = false;
bool fin_received = false;
bool receiving = false;
bool sending = false;
};
TcpSocket::TcpSocket() :
m_impl{ make_unique<TcpSocketImpl>( this ) }
{
}
TcpSocket::~TcpSocket() {
Close();
}
TcpSocket::Ptr TcpSocket::Create() {
return std::make_shared<TcpSocketMaker>();
}
void TcpSocket::Connect( const Endpoint& endpoint ) {
auto lock = AcquireLock();
if( m_impl->connected ) {
ErrorMessage() << "Connect() Error: Disconnect the current connection before reconnecting.\n";
return;
}
m_impl->send_buffer.clear();
m_impl->receive_buffer.clear();
auto asio_endpoint = asio::ip::basic_endpoint<asio::ip::tcp>{ endpoint.GetAddress().m_impl->address, endpoint.GetPort() };
m_impl->asio_socket.async_connect(
asio_endpoint,
static_cast<asio::io_context::strand*>( GetStrand() )->wrap(
std::bind(
[&]( std::weak_ptr<TcpSocket> socket, const asio::error_code& error ) {
auto shared_socket = socket.lock();
if( !shared_socket ) {
return;
}
auto handler_lock = shared_socket->AcquireLock();
if( !error ) {
shared_socket->OnConnected();
shared_socket->m_impl->connected = true;
shared_socket->m_impl->request_shutdown = false;
shared_socket->m_impl->fin_sent = false;
shared_socket->m_impl->fin_received = false;
shared_socket->m_impl->ReceiveHandler( asio::error_code{}, 0 );
shared_socket->m_impl->SendHandler( asio::error_code{}, 0 );
}
else if( ( error == asio::error::operation_aborted ) || ( error == asio::error::connection_aborted ) || ( error == asio::error::connection_reset ) ) {
shared_socket->m_impl->fin_sent = true;
shared_socket->m_impl->fin_received = true;
shared_socket->m_impl->connected = false;
}
else {
shared_socket->m_impl->connected = false;
ErrorMessage() << "Connect() Error: " << error.message() << "\n";
}
},
std::weak_ptr<TcpSocket>( shared_from_this() ), std::placeholders::_1
)
)
);
}
void TcpSocket::Shutdown() {
auto lock = AcquireLock();
if( !m_impl->asio_socket.is_open() ) {
m_impl->connected = false;
return;
}
if( !m_impl->connected ) {
ErrorMessage() << "Shutdown() Error: Cannot shutdown unconnected socket.\n";
return;
}
if( m_impl->fin_sent ) {
return;
}
m_impl->request_shutdown = true;
if( m_impl->send_buffer.empty() ) {
asio::error_code error;
m_impl->asio_socket.shutdown( asio::ip::tcp::socket::shutdown_send, error );
if( ( error == asio::error::connection_aborted ) || ( error == asio::error::connection_reset ) ) {
m_impl->fin_received = true;
m_impl->fin_sent = true;
return;
}
else if( error == asio::error::not_connected ) {
}
else if( error ) {
ErrorMessage() << "Shutdown() Error: " << error.message() << "\n";
return;
}
m_impl->fin_sent = true;
}
}
void TcpSocket::Close() {
{
auto lock = AcquireLock();
if( !m_impl->asio_socket.is_open() ) {
m_impl->connected = false;
return;
}
if( !m_impl->fin_sent ) {
asio::error_code error;
m_impl->asio_socket.shutdown( asio::ip::tcp::socket::shutdown_send, error );
if( ( error == asio::error::connection_aborted ) || ( error == asio::error::connection_reset ) ) {
m_impl->fin_received = true;
}
else if( error == asio::error::not_connected ) {
}
else if( error ) {
ErrorMessage() << "Shutdown() Error: " << error.message() << "\n";
return;
}
m_impl->fin_sent = true;
if( !m_impl->send_buffer.empty() ) {
WarningMessage() << "Close(): Warning, did not send all data before shutdown, possible data loss might occur.\n";
}
}
if( !m_impl->fin_received ) {
WarningMessage() << "Close(): Warning, the remote host did not request connection shutdown, possible data loss might occur.\n";
}
m_impl->connected = false;
asio::error_code error;
m_impl->asio_socket.shutdown( asio::ip::tcp::socket::shutdown_both, error );
if( error == asio::error::not_connected ) {
}
else if( error ) {
ErrorMessage() << "Close() Error: " << error.message() << "\n";
}
m_impl->asio_socket.close();
}
OnDisconnected();
}
/// @cond
void TcpSocket::Reset() {
m_impl->fin_received = true;
}
/// @endcond
bool TcpSocket::LocalHasShutdown() const {
auto lock = AcquireLock();
return m_impl->fin_sent;
}
bool TcpSocket::RemoteHasShutdown() const {
auto lock = AcquireLock();
return m_impl->fin_received;
}
bool TcpSocket::Send( const void* data, std::size_t size ) {
auto lock = AcquireLock();
if( !data || !size ) {
return false;
}
if( m_impl->request_shutdown ) {
ErrorMessage() << "Send() Error: Cannot send data after shutdown.\n";
return false;
}
if( m_impl->send_buffer.size() + size >= GetMaximumBlockSize() ) {
return false;
}
bool start = m_impl->send_buffer.empty();
m_impl->send_buffer.insert( m_impl->send_buffer.end(), static_cast<const char*>( data ), static_cast<const char*>( data ) + size );
if( start ) {
m_impl->SendHandler( asio::error_code{}, 0 );
}
return true;
}
std::size_t TcpSocket::Receive( void* data, std::size_t size ) {
auto lock = AcquireLock();
if( !data || !size ) {
return 0;
}
auto receive_size = std::min( size, m_impl->receive_buffer.size() );
for( std::size_t index = 0; index < receive_size; index++ ) {
static_cast<char*>( data )[index] = m_impl->receive_buffer[index];
}
auto start = false;
if( ( m_impl->receive_buffer.size() >= GetMaximumBlockSize() ) && ( m_impl->receive_buffer.size() - receive_size ) < GetMaximumBlockSize() ) {
start = true;
}
m_impl->receive_buffer.erase( m_impl->receive_buffer.begin(), m_impl->receive_buffer.begin() + static_cast<int>( receive_size ) );
if( start ) {
m_impl->ReceiveHandler( asio::error_code{}, 0 );
}
return receive_size;
}
bool TcpSocket::Send( const Message& message ) {
auto lock = AcquireLock();
auto message_size = message.GetSize();
if( m_impl->send_buffer.size() + sizeof( message_size ) + message_size >= GetMaximumBlockSize() ) {
return false;
}
std::vector<char> data_block( sizeof( message_size ) + message_size );
std::memcpy( &data_block[0], &message_size, sizeof( message_size ) );
if( message_size ) {
const auto& message_data = message.GetBuffer();
std::copy( std::begin( message_data ), std::end( message_data ), std::begin( data_block ) + sizeof( message_size ) );
}
return Send( &data_block[0], sizeof( message_size ) + static_cast<std::size_t>( message_size ) );
}
std::size_t TcpSocket::Receive( Message& message ) {
auto lock = AcquireLock();
message.Clear();
Message::size_type message_size = 0;
if( m_impl->receive_buffer.size() < sizeof( message_size ) ) {
return 0;
}
for( std::size_t index = 0; index < sizeof( message_size ); index++ ) {
reinterpret_cast<char*>( &message_size )[index] = m_impl->receive_buffer[index];
}
if( m_impl->receive_buffer.size() < sizeof( message_size ) + message_size ) {
return 0;
}
auto start = false;
if( ( m_impl->receive_buffer.size() >= GetMaximumBlockSize() ) && ( m_impl->receive_buffer.size() - ( sizeof( message_size ) + message_size ) ) < GetMaximumBlockSize() ) {
start = true;
}
std::vector<char> data_block( message_size );
m_impl->receive_buffer.erase( m_impl->receive_buffer.begin(), m_impl->receive_buffer.begin() + sizeof( message_size ) );
std::copy_n( m_impl->receive_buffer.begin(), message_size, data_block.begin() );
message.Append( data_block );
m_impl->receive_buffer.erase( m_impl->receive_buffer.begin(), m_impl->receive_buffer.begin() + message_size );
if( start ) {
m_impl->ReceiveHandler( asio::error_code{}, 0 );
}
return sizeof( message_size ) + message_size;
}
bool TcpSocket::IsConnected() const {
auto lock = AcquireLock();
return m_impl->connected;
}
Endpoint TcpSocket::GetLocalEndpoint() const {
auto lock = AcquireLock();
IpAddress address;
address.m_impl->address = m_impl->asio_socket.local_endpoint().address();
return { address, m_impl->asio_socket.local_endpoint().port() };
}
Endpoint TcpSocket::GetRemoteEndpoint() const {
auto lock = AcquireLock();
IpAddress address;
address.m_impl->address = m_impl->asio_socket.remote_endpoint().address();
return { address, m_impl->asio_socket.remote_endpoint().port() };
}
void TcpSocket::ClearBuffers() {
auto lock = AcquireLock();
m_impl->send_buffer.clear();
m_impl->receive_buffer.clear();
m_impl->ReceiveHandler( asio::error_code{}, 0 );
}
std::size_t TcpSocket::BytesToSend() const {
auto lock = AcquireLock();
return m_impl->send_buffer.size();
}
std::size_t TcpSocket::BytesToReceive() const {
auto lock = AcquireLock();
return m_impl->receive_buffer.size();
}
int TcpSocket::GetLinger() const {
auto lock = AcquireLock();
asio::socket_base::linger option;
asio::error_code error;
m_impl->asio_socket.get_option( option, error );
if( error ) {
ErrorMessage() << "GetLinger() Error: " << error.message() << "\n";
}
return option.enabled() ? option.timeout() : 0;
}
void TcpSocket::SetLinger( int timeout ) {
auto lock = AcquireLock();
asio::socket_base::linger option( timeout > 0, timeout );
asio::error_code error;
m_impl->asio_socket.set_option( option, error );
if( error ) {
ErrorMessage() << "SetLinger() Error: " << error.message() << "\n";
}
}
bool TcpSocket::GetKeepAlive() const {
auto lock = AcquireLock();
asio::socket_base::keep_alive option;
asio::error_code error;
m_impl->asio_socket.get_option( option, error );
if( error ) {
ErrorMessage() << "GetKeepAlive() Error: " << error.message() << "\n";
}
return option.value();
}
void TcpSocket::SetKeepAlive( bool keep_alive ) {
auto lock = AcquireLock();
asio::socket_base::keep_alive option( keep_alive );
asio::error_code error;
m_impl->asio_socket.set_option( option, error );
if( error ) {
ErrorMessage() << "SetKeepAlive() Error: " << error.message() << "\n";
}
}
/// @cond
void TcpSocket::SetInternalSocket( void* internal_socket ) {
m_impl->asio_socket = std::move( *static_cast<asio::ip::tcp::socket*>( internal_socket ) );
OnConnected();
m_impl->connected = true;
m_impl->request_shutdown = false;
m_impl->fin_sent = false;
m_impl->fin_received = false;
m_impl->ReceiveHandler( asio::error_code{}, 0 );
m_impl->SendHandler( asio::error_code{}, 0 );
}
/// @endcond
}