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/***
This file is part of snapcast
Copyright (C) 2014-2025 Johannes Pohl
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
***/
// prototype/interface header file
#include "control_session_tcp.hpp"
// 3rd party headers
#include <boost/asio/read_until.hpp>
#include <boost/asio/write.hpp>
// local headers
#include "common/aixlog.hpp"
#include "server_settings.hpp"
using namespace std;
static constexpr auto LOG_TAG = "ControlSessionTCP";
// https://stackoverflow.com/questions/7754695/boost-asio-async-write-how-to-not-interleaving-async-write-calls/7756894
ControlSessionTcp::ControlSessionTcp(ControlMessageReceiver* receiver, tcp::socket&& socket, const ServerSettings& settings)
: ControlSession(receiver, settings), socket_(std::move(socket)), strand_(boost::asio::make_strand(socket_.get_executor()))
{
}
ControlSessionTcp::~ControlSessionTcp()
{
LOG(DEBUG, LOG_TAG) << "ControlSessionTcp::~ControlSessionTcp()\n";
stop();
}
void ControlSessionTcp::do_read()
{
const std::string delimiter = "\n";
boost::asio::async_read_until(socket_, streambuf_, delimiter,
[this, self = shared_from_this(), delimiter](const std::error_code& ec, std::size_t bytes_transferred)
{
if (ec)
{
LOG(ERROR, LOG_TAG) << "Error while reading from control socket: " << ec.message() << "\n";
return;
}
// Extract up to the first delimiter.
std::string line{buffers_begin(streambuf_.data()), buffers_begin(streambuf_.data()) + bytes_transferred - delimiter.length()};
if (!line.empty())
{
if (line.back() == '\r')
line.resize(line.size() - 1);
// LOG(DEBUG, LOG_TAG) << "received: " << line << "\n";
if ((message_receiver_ != nullptr) && !line.empty())
{
message_receiver_->onMessageReceived(shared_from_this(), line, [this](const std::string& response)
{
if (!response.empty())
sendAsync(response);
});
}
}
streambuf_.consume(bytes_transferred);
do_read();
});
}
void ControlSessionTcp::start()
{
do_read();
}
void ControlSessionTcp::stop()
{
LOG(DEBUG, LOG_TAG) << "ControlSession::stop\n";
boost::system::error_code ec;
socket_.shutdown(boost::asio::ip::tcp::socket::shutdown_both, ec);
if (ec)
LOG(ERROR, LOG_TAG) << "Error in socket shutdown: " << ec.message() << "\n";
socket_.close(ec);
if (ec)
LOG(ERROR, LOG_TAG) << "Error in socket close: " << ec.message() << "\n";
LOG(DEBUG, LOG_TAG) << "ControlSession ControlSession stopped\n";
}
void ControlSessionTcp::sendAsync(const std::string& message)
{
boost::asio::post(strand_, [this, self = shared_from_this(), message]()
{
messages_.emplace_back(message + "\r\n");
if (messages_.size() > 1)
{
LOG(DEBUG, LOG_TAG) << "TCP session outstanding async_writes: " << messages_.size() << "\n";
return;
}
send_next();
});
}
void ControlSessionTcp::send_next()
{
boost::asio::async_write(socket_, boost::asio::buffer(messages_.front()), [this, self = shared_from_this()](std::error_code ec, std::size_t length)
{
messages_.pop_front();
if (ec)
{
LOG(ERROR, LOG_TAG) << "Error while writing to control socket: " << ec.message() << "\n";
}
else
{
LOG(TRACE, LOG_TAG) << "Wrote " << length << " bytes to control socket\n";
}
if (!messages_.empty())
send_next();
});
}
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