Erixonich commented on code in PR #7607: URL: https://github.com/apache/ignite-3/pull/7607#discussion_r2932795500
########## modules/platforms/cpp/tests/fake_server/proxy/asio_proxy.h: ########## @@ -0,0 +1,248 @@ +// Licensed to the Apache Software Foundation (ASF) under one or more +// contributor license agreements. See the NOTICE file distributed with +// this work for additional information regarding copyright ownership. +// The ASF licenses this file to You under the Apache License, Version 2.0 +// (the "License"); you may not use this file except in compliance with +// the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. +// + +#pragma once + +#include <atomic> +#include <iostream> +#include <map> +#include <memory> +#include <queue> +#include <thread> +#include <vector> + +#include <asio.hpp> +#include <asio/ts/internet.hpp> + +#include "message_listener.h" + +#include <list> + +namespace ignite::proxy { + +using asio::ip::tcp; + +static constexpr size_t BUFF_SIZE = 4096; + +struct configuration { + asio::ip::port_type m_in_port; + std::string m_out_host_and_port; + std::shared_ptr<message_listener> m_listener; + + configuration( + asio::ip::port_type m_in_port, + const std::string &m_out_host_and_port, + std::shared_ptr<message_listener> m_listener) + : m_in_port(m_in_port) + , m_out_host_and_port(m_out_host_and_port) + , m_listener(std::move(m_listener)) { } +}; + +enum class direction { forward, reverse }; + +template<direction DIRECTION> +class session_part: public std::enable_shared_from_this<session_part<DIRECTION>> { +public: + session_part(std::shared_ptr<tcp::socket> m_src, std::shared_ptr<tcp::socket> m_dst, std::shared_ptr<message_listener> listener) + : m_src(std::move(m_src)) + , m_dst(std::move(m_dst)) + , m_listener(std::move(listener)) {} + + void do_read() { + std::cout << "Reading from socket\n"; + + m_src->async_read_some(asio::buffer(m_buf, BUFF_SIZE), + [self = std::move(this->shared_from_this())](const asio::error_code& ec, size_t len) { + if (ec) { + if (ec == asio::error::eof) { + return; + } + throw std::runtime_error("Error while reading from socket " + ec.message()); + } + + message m{self->m_buf.begin(), self->m_buf.begin() + len}; + + if (self->m_listener) { + if constexpr (DIRECTION == direction::forward) { + self->m_listener->register_out_message(m); + } else { + self->m_listener->register_in_message(m); + } + } + + self->do_write(std::move(m)); + }); + } + + void do_write(message&& msg) { + asio::async_write( + *m_dst, asio::buffer(msg.data(), msg.size()), + [self = std::move(this->shared_from_this())](asio::error_code ec, size_t) { + if (ec) { + if (ec == asio::error::eof) { + return; + } + throw std::runtime_error("Error while writing to socket " + ec.message()); + } + + self->do_read(); + }); + } + +private: + std::shared_ptr<tcp::socket> m_src; + std::shared_ptr<tcp::socket> m_dst; + std::array<char, BUFF_SIZE> m_buf{}; + std::shared_ptr<message_listener> m_listener{nullptr}; + +}; + +class session : public std::enable_shared_from_this<session> { +public: + session( + std::shared_ptr<tcp::socket> in_sock, + std::shared_ptr<tcp::socket> out_sock, + std::shared_ptr<message_listener> listener) + : m_in_sock(std::move(in_sock)) + , m_out_sock(std::move(out_sock)) + { + m_forward_part = std::make_shared<session_part<direction::forward>>(m_in_sock, m_out_sock, listener); + m_reverse_part = std::make_shared<session_part<direction::reverse>>(m_out_sock, m_in_sock, listener); + } + + void start() { do_serve(); } + + tcp::socket &get_out_sock() { return *m_out_sock; } + +private: + void do_serve() { + m_forward_part->do_read(); + m_reverse_part->do_read(); + } + + std::shared_ptr<tcp::socket> m_in_sock; + std::shared_ptr<tcp::socket> m_out_sock; + + std::shared_ptr<session_part<direction::forward>> m_forward_part; + std::shared_ptr<session_part<direction::reverse>> m_reverse_part; +}; + +class asio_proxy { +public: + asio_proxy(std::vector<configuration> configurations) + : m_resolver(m_io_context) + { + for (auto &cfg : configurations) { + m_conn_map.emplace( + cfg.m_in_port, + proxy_entry{m_io_context, cfg.m_in_port, cfg.m_out_host_and_port, cfg.m_listener} + ); + } + + do_serve(); + + m_executor = std::make_unique<std::thread>([this]() { + m_io_context.run(); + }); + } + + ~asio_proxy() { + m_stopped.store(true); + m_io_context.stop(); + + m_executor->join(); + } + +private: + struct proxy_entry { + tcp::acceptor m_in_acceptor; + std::string m_out_host; + std::string m_out_port; + std::shared_ptr<message_listener> m_listener; + + proxy_entry( + asio::io_context& io_context, + asio::ip::port_type in_port, + const std::string& out_host_and_port, Review Comment: This is done for usability purposes. 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