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// Copyright (c) 2019 Egor Tensin <Egor.Tensin@gmail.com>
// This file is part of the "math-server" project.
// For details, see https://github.com/egor-tensin/math-server.
// Distributed under the MIT License.
#include "session.hpp"
#include "session_manager.hpp"
#include "../common/error.hpp"
#include "../common/log.hpp"
#include "../parser/parser.hpp"
#include <boost/asio.hpp>
#include <boost/lexical_cast.hpp>
#include <boost/system/error_code.hpp>
#include <boost/system/system_error.hpp>
#include <cstddef>
#include <exception>
#include <string>
#include <utility>
namespace math::server {
namespace {
std::string reply_to_string(double result) {
return boost::lexical_cast<std::string>(result);
}
std::string calc_reply(const std::string& input) {
std::string reply;
try {
reply = reply_to_string(Parser{input}.exec());
} catch (const std::exception& e) {
reply = e.what();
}
return reply;
}
}
Session::Session(SessionManager& mgr, boost::asio::io_context& io_context)
: m_session_mgr{mgr}, m_strand{io_context}, m_socket{io_context}
{ }
boost::asio::ip::tcp::socket& Session::socket() {
return m_socket;
}
void Session::start() {
read();
}
void Session::stop() {
close();
}
void Session::close() {
try {
m_socket.shutdown(boost::asio::ip::tcp::socket::shutdown_both);
m_socket.close();
} catch (const boost::system::system_error& e) {
throw Error{e.what()};
}
}
void Session::read() {
const auto self = shared_from_this();
// Stop at LF
boost::asio::async_read_until(m_socket, m_buffer, '\n', boost::asio::bind_executor(m_strand,
[this, self] (const boost::system::error_code& ec, std::size_t bytes) {
handle_read(ec, bytes);
}));
}
void Session::handle_read(const boost::system::error_code& ec, std::size_t bytes) {
if (ec) {
log::error("%1%: %2%", __func__, ec.message());
m_session_mgr.stop(shared_from_this());
return;
}
write(calc_reply(consume_input(bytes)));
}
std::string Session::consume_input(std::size_t bytes) {
const auto data = boost::asio::buffer_cast<const char*>(m_buffer.data());
const std::string input{data, bytes - 1};
m_buffer.consume(bytes);
return input;
}
void Session::write(const std::string& output) {
const auto self = shared_from_this();
std::ostream os(&m_buffer);
// Include CR (so that Windows' telnet client works)
os << output << "\r\n";
boost::asio::async_write(m_socket, m_buffer, boost::asio::bind_executor(m_strand,
[this, self] (const boost::system::error_code& ec, std::size_t bytes) {
handle_write(ec, bytes);
}));
}
void Session::handle_write(const boost::system::error_code& ec, std::size_t bytes) {
if (ec) {
log::error("%1%: %2%", __func__, ec.message());
m_session_mgr.stop(shared_from_this());
return;
}
read();
}
}
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