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122 lines
3.4 KiB
C++
122 lines
3.4 KiB
C++
/* Copyright (c) 2019 Marcelo Zimbres Silva (mzimbres@gmail.com)
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/.
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*/
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#include <iostream>
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#include <queue>
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#include <vector>
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#include <aedis/aedis.hpp>
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#include <aedis/src.hpp>
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#include "lib/user_session.hpp"
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#include "lib/net_utils.hpp"
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namespace net = aedis::net;
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using aedis::redis::command;
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using aedis::user_session;
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using aedis::user_session_base;
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using aedis::resp3::node;
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using aedis::resp3::adapt;
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using aedis::resp3::experimental::client;
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using aedis::resp3::type;
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class receiver : public std::enable_shared_from_this<receiver> {
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private:
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std::vector<node> resps_;
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std::queue<std::weak_ptr<user_session_base>> sessions_;
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public:
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void on_message(std::error_code ec, command cmd)
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{
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if (ec) {
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std::cerr << "Error: " << ec.message() << std::endl;
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return;
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}
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switch (cmd) {
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case command::ping:
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{
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if (auto session = sessions_.front().lock()) {
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session->deliver(resps_.front().data);
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} else {
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std::cout << "Session expired." << std::endl;
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}
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sessions_.pop();
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} break;
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case command::incr:
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{
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std::cout << "Echos so far: " << resps_.front().data << std::endl;
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} break;
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default: { /* Ignore */; }
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}
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resps_.clear();
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}
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auto get_extended_adapter()
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{
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return [adapter = adapt(resps_)](command, type t, std::size_t aggregate_size, std::size_t depth, char const* data, std::size_t size, std::error_code& ec) mutable
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{ return adapter(t, aggregate_size, depth, data, size, ec); };
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}
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void add_user_session(std::shared_ptr<user_session_base> session)
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{ sessions_.push(session); }
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};
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net::awaitable<void> connection_manager(std::shared_ptr<client> db)
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{
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try {
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auto socket = co_await connect();
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co_await db->engage(std::move(socket));
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} catch (std::exception const& e) {
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std::cerr << "Error: " << e.what() << std::endl;
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}
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}
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net::awaitable<void> listener()
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{
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auto ex = co_await net::this_coro::executor;
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net::ip::tcp::acceptor acceptor(ex, {net::ip::tcp::v4(), 55555});
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auto recv = std::make_shared<receiver>();
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auto on_db_msg = [recv](std::error_code ec, command cmd)
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{ recv->on_message(ec, cmd); };
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auto db = std::make_shared<client>(ex);
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db->set_extended_adapter(recv->get_extended_adapter());
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db->set_msg_callback(on_db_msg);
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net::co_spawn(ex, connection_manager(db), net::detached);
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for (;;) {
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auto socket = co_await acceptor.async_accept(net::use_awaitable);
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auto session = std::make_shared<user_session>(std::move(socket));
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auto on_user_msg = [db, recv, session](std::string const& msg)
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{
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db->send(command::ping, msg);
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db->send(command::incr, "echo-counter");
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recv->add_user_session(session);
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};
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session->start(on_user_msg);
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}
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}
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int main()
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{
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try {
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net::io_context ioc{1};
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net::signal_set signals(ioc, SIGINT, SIGTERM);
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signals.async_wait([&](auto, auto){ ioc.stop(); });
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co_spawn(ioc, listener(), net::detached);
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ioc.run();
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} catch (std::exception const& e) {
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std::cerr << e.what() << std::endl;
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}
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}
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