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-rw-r--r--server/main/CMakeLists.txt13
-rw-r--r--server/main/main.cpp34
-rw-r--r--server/main/server.cpp112
-rw-r--r--server/main/server.hpp34
-rw-r--r--server/main/session.cpp114
-rw-r--r--server/main/session.hpp42
-rw-r--r--server/main/session_manager.cpp38
-rw-r--r--server/main/session_manager.hpp30
-rw-r--r--server/main/settings.hpp87
9 files changed, 504 insertions, 0 deletions
diff --git a/server/main/CMakeLists.txt b/server/main/CMakeLists.txt
new file mode 100644
index 0000000..b322390
--- /dev/null
+++ b/server/main/CMakeLists.txt
@@ -0,0 +1,13 @@
+find_package(Boost REQUIRED COMPONENTS filesystem program_options)
+
+option(DEBUG_ASIO "enable debug output for Boost.Asio" OFF)
+
+add_executable(server main.cpp server.cpp session.cpp session_manager.cpp)
+target_link_libraries(server PRIVATE common parser)
+
+target_include_directories(server SYSTEM PRIVATE ${Boost_INCLUDE_DIRS})
+target_link_libraries(server PRIVATE ${Boost_LIBRARIES})
+
+if(DEBUG_ASIO)
+ target_compile_definitions(server PRIVATE BOOST_ASIO_ENABLE_HANDLER_TRACKING)
+endif()
diff --git a/server/main/main.cpp b/server/main/main.cpp
new file mode 100644
index 0000000..2cf6d35
--- /dev/null
+++ b/server/main/main.cpp
@@ -0,0 +1,34 @@
+#include "server.hpp"
+#include "settings.hpp"
+
+#include <boost/program_options.hpp>
+
+#include <exception>
+#include <iostream>
+
+int main(int argc, char* argv[]) {
+ try {
+ math::server::SettingsParser parser{argv[0]};
+
+ try {
+ const auto settings = parser.parse(argc, argv);
+ if (settings.exit_with_usage()) {
+ parser.usage();
+ return 0;
+ }
+
+ math::server::Server server{settings};
+ server.run();
+ } catch (const boost::program_options::error& e) {
+ parser.usage_error(e);
+ return 1;
+ }
+ } catch (const std::exception& e) {
+ std::cerr << "An error occured: " << e.what() << "\n";
+ return 1;
+ } catch (...) {
+ std::cerr << "An unknown error occured\n";
+ return 1;
+ }
+ return 0;
+}
diff --git a/server/main/server.cpp b/server/main/server.cpp
new file mode 100644
index 0000000..3800144
--- /dev/null
+++ b/server/main/server.cpp
@@ -0,0 +1,112 @@
+#include "server.hpp"
+#include "session.hpp"
+#include "session_manager.hpp"
+#include "settings.hpp"
+
+#include "../common/error.hpp"
+#include "../common/log.hpp"
+
+#include <boost/asio.hpp>
+#include <boost/system/error_code.hpp>
+#include <boost/system/system_error.hpp>
+
+#include <cstddef>
+
+#include <exception>
+#include <thread>
+#include <vector>
+
+namespace math::server {
+namespace {
+
+boost::asio::ip::tcp::endpoint make_endpoint(unsigned port) {
+ return {boost::asio::ip::tcp::v4(), port};
+}
+
+void configure_acceptor(boost::asio::ip::tcp::acceptor& acceptor, unsigned port) {
+ try {
+ const auto endpoint = make_endpoint(port);
+ acceptor.open(endpoint.protocol());
+ acceptor.set_option(boost::asio::ip::tcp::acceptor::reuse_address(true));
+ acceptor.bind(endpoint);
+ acceptor.listen();
+ } catch (const boost::system::system_error& e) {
+ throw Error{e.what()};
+ }
+}
+
+}
+
+Server::Server(const Settings& settings)
+ : Server{settings.m_port, settings.m_threads}
+{ }
+
+Server::Server(unsigned port, unsigned threads)
+ : m_numof_threads{threads}
+ , m_signals{m_io_context}
+ , m_acceptor{m_io_context} {
+
+ wait_for_signal();
+ configure_acceptor(m_acceptor, port);
+
+ accept();
+}
+
+void Server::run() {
+ std::vector<std::thread> threads{m_numof_threads};
+ for (std::size_t i = 0; i < m_numof_threads; ++i) {
+ threads[i] = std::thread{[this] () { m_io_context.run(); }};
+ }
+
+ for (std::size_t i = 0; i < m_numof_threads; ++i) {
+ threads[i].join();
+ }
+}
+
+void Server::wait_for_signal() {
+ try {
+ m_signals.add(SIGINT);
+ m_signals.add(SIGTERM);
+
+ m_signals.async_wait([this] (const boost::system::error_code& ec, int signo) {
+ handle_signal(ec, signo);
+ });
+ } catch (const boost::system::system_error& e) {
+ throw Error{e.what()};
+ }
+}
+
+void Server::handle_signal(const boost::system::error_code& ec, int signo) {
+ if (ec) {
+ log::error("%1%: %2%", __func__, ec.message());
+ }
+
+ log::log("Caught signal %1%", signo);
+
+ try {
+ m_acceptor.close();
+ m_session_mgr.stop_all();
+ } catch (const std::exception& e) {
+ log::error(e.what());
+ }
+}
+
+void Server::accept() {
+ const auto session = m_session_mgr.make_session(m_io_context);
+ m_acceptor.async_accept(session->socket(),
+ [session, this] (const boost::system::error_code& ec) {
+ handle_accept(session, ec);
+ });
+}
+
+void Server::handle_accept(SessionPtr session, const boost::system::error_code& ec) {
+ if (ec) {
+ log::error("%1%: %2%", __func__, ec.message());
+ return;
+ }
+
+ m_session_mgr.start(session);
+ accept();
+}
+
+}
diff --git a/server/main/server.hpp b/server/main/server.hpp
new file mode 100644
index 0000000..5524f88
--- /dev/null
+++ b/server/main/server.hpp
@@ -0,0 +1,34 @@
+#pragma once
+
+#include "session_manager.hpp"
+#include "settings.hpp"
+
+#include <boost/asio.hpp>
+#include <boost/system/error_code.hpp>
+
+namespace math::server {
+
+class Server {
+public:
+ Server(const Settings& settings);
+ Server(unsigned port, unsigned threads);
+
+ void run();
+
+private:
+ void wait_for_signal();
+ void handle_signal(const boost::system::error_code&, int);
+
+ void accept();
+ void handle_accept(SessionPtr session, const boost::system::error_code& ec);
+
+ const unsigned m_numof_threads;
+
+ boost::asio::io_context m_io_context;
+ boost::asio::signal_set m_signals;
+ boost::asio::ip::tcp::acceptor m_acceptor;
+
+ SessionManager m_session_mgr;
+};
+
+}
diff --git a/server/main/session.cpp b/server/main/session.cpp
new file mode 100644
index 0000000..0ee7f75
--- /dev/null
+++ b/server/main/session.cpp
@@ -0,0 +1,114 @@
+#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(std::string output) {
+ const auto self = shared_from_this();
+
+ // Include CR (so that Windows' telnet client works)
+ output += "\r\n";
+
+ boost::asio::const_buffer buffer{output.c_str(), output.length()};
+
+ boost::asio::async_write(m_socket, std::move(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();
+}
+
+}
diff --git a/server/main/session.hpp b/server/main/session.hpp
new file mode 100644
index 0000000..ace3755
--- /dev/null
+++ b/server/main/session.hpp
@@ -0,0 +1,42 @@
+#pragma once
+
+#include <boost/asio.hpp>
+#include <boost/system/error_code.hpp>
+
+#include <cstddef>
+
+#include <memory>
+#include <string>
+
+namespace math::server {
+
+class SessionManager;
+
+class Session : public std::enable_shared_from_this<Session> {
+public:
+ Session(SessionManager& mgr, boost::asio::io_context& io_context);
+
+ boost::asio::ip::tcp::socket& socket();
+
+ void start();
+ void stop();
+
+private:
+ void close();
+
+ void read();
+ void write(std::string);
+
+ void handle_read(const boost::system::error_code&, std::size_t);
+ void handle_write(const boost::system::error_code&, std::size_t);
+
+ std::string consume_input(std::size_t);
+
+ SessionManager& m_session_mgr;
+
+ boost::asio::io_context::strand m_strand;
+ boost::asio::ip::tcp::socket m_socket;
+ boost::asio::streambuf m_buffer;
+};
+
+}
diff --git a/server/main/session_manager.cpp b/server/main/session_manager.cpp
new file mode 100644
index 0000000..c2aef6d
--- /dev/null
+++ b/server/main/session_manager.cpp
@@ -0,0 +1,38 @@
+#include "session.hpp"
+#include "session_manager.hpp"
+
+#include "../common/log.hpp"
+
+#include <memory>
+#include <mutex>
+
+namespace math::server {
+
+SessionPtr SessionManager::make_session(boost::asio::io_context& io_context) {
+ return std::make_shared<Session>(*this, io_context);
+}
+
+void SessionManager::start(const SessionPtr& session) {
+ std::lock_guard<std::mutex> lck{m_mtx};
+ m_sessions.emplace(session);
+ session->start();
+}
+
+void SessionManager::stop(const SessionPtr& session) {
+ std::lock_guard<std::mutex> lck{m_mtx};
+ const auto removed = m_sessions.erase(session) > 0;
+ if (removed) {
+ session->stop();
+ }
+}
+
+void SessionManager::stop_all() {
+ std::lock_guard<std::mutex> lck{m_mtx};
+ log::log("Closing the remaining %1% session(s)...", m_sessions.size());
+ for (const auto& session : m_sessions) {
+ session->stop();
+ }
+ m_sessions.clear();
+}
+
+}
diff --git a/server/main/session_manager.hpp b/server/main/session_manager.hpp
new file mode 100644
index 0000000..f0bec0b
--- /dev/null
+++ b/server/main/session_manager.hpp
@@ -0,0 +1,30 @@
+#pragma once
+
+#include <boost/asio.hpp>
+
+#include <mutex>
+#include <memory>
+#include <unordered_set>
+
+namespace math::server {
+
+class Session;
+using SessionPtr = std::shared_ptr<Session>;
+
+class SessionManager {
+public:
+ SessionManager() = default;
+
+ SessionPtr make_session(boost::asio::io_context&);
+
+ void start(const SessionPtr&);
+ void stop(const SessionPtr&);
+
+ void stop_all();
+
+private:
+ std::mutex m_mtx;
+ std::unordered_set<SessionPtr> m_sessions;
+};
+
+}
diff --git a/server/main/settings.hpp b/server/main/settings.hpp
new file mode 100644
index 0000000..310163f
--- /dev/null
+++ b/server/main/settings.hpp
@@ -0,0 +1,87 @@
+#pragma once
+
+#include <boost/filesystem.hpp>
+#include <boost/program_options.hpp>
+
+#include <exception>
+#include <iostream>
+#include <string>
+#include <thread>
+#include <vector>
+
+namespace math::server {
+
+struct Settings {
+ static constexpr unsigned DEFAULT_PORT = 18000;
+
+ static unsigned default_threads() { return std::thread::hardware_concurrency(); }
+
+ unsigned m_port;
+ unsigned m_threads;
+
+ bool exit_with_usage() const { return m_vm.count("help"); }
+
+ boost::program_options::variables_map m_vm;
+};
+
+class SettingsParser {
+public:
+ explicit SettingsParser(const std::string& argv0)
+ : m_prog_name{extract_filename(argv0)}
+ {
+ m_visible.add_options()
+ ("help,h",
+ "show this message and exit")
+ ("port,p",
+ boost::program_options::value(&m_settings.m_port)->default_value(Settings::DEFAULT_PORT),
+ "server port number")
+ ("threads,n",
+ boost::program_options::value(&m_settings.m_threads)->default_value(Settings::default_threads()),
+ "number of threads");
+ }
+
+ static const char* get_short_description() {
+ return "[-h|--help] [-p|--port] [-n|--threads]";
+ }
+
+ Settings parse(int argc, char* argv[]) {
+ boost::program_options::store(
+ boost::program_options::command_line_parser{argc, argv}
+ .options(m_visible)
+ .run(),
+ m_settings.m_vm);
+ if (m_settings.exit_with_usage()) {
+ return m_settings;
+ }
+ boost::program_options::notify(m_settings.m_vm);
+ return m_settings;
+ }
+
+ void usage() const {
+ std::cout << *this;
+ }
+
+ void usage_error(const std::exception& e) const {
+ std::cerr << "usage error: " << e.what() << '\n';
+ std::cerr << *this;
+ }
+
+private:
+ static std::string extract_filename(const std::string& path) {
+ return boost::filesystem::path{path}.filename().string();
+ }
+
+ const std::string m_prog_name;
+
+ boost::program_options::options_description m_visible;
+
+ Settings m_settings;
+
+ friend std::ostream& operator<<(std::ostream& os, const SettingsParser& parser) {
+ os << "usage: " << parser.m_prog_name << ' ' << get_short_description() << '\n';
+ os << parser.m_visible;
+ return os;
+ }
+};
+
+}
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