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100 lines
3.2 KiB
C++
100 lines
3.2 KiB
C++
/* Copyright (c) 2018-2022 Marcelo Zimbres Silva (mzimbres@gmail.com)
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*
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* Distributed under the Boost Software License, Version 1.0. (See
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* accompanying file LICENSE.txt)
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*/
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#include <string>
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#include <iostream>
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#include "unistd.h"
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#include <boost/asio.hpp>
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#if defined(BOOST_ASIO_HAS_CO_AWAIT) && defined(BOOST_ASIO_HAS_POSIX_STREAM_DESCRIPTOR)
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#include <aedis.hpp>
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#include "print.hpp"
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// Include this in no more than one .cpp file.
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#include <aedis/src.hpp>
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namespace net = boost::asio;
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using aedis::adapt;
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using aedis::resp3::request;
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using aedis::resp3::node;
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using aedis::endpoint;
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using tcp_socket = net::use_awaitable_t<>::as_default_on_t<net::ip::tcp::socket>;
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using tcp_acceptor = net::use_awaitable_t<>::as_default_on_t<net::ip::tcp::acceptor>;
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using stream_descriptor = net::use_awaitable_t<>::as_default_on_t<net::posix::stream_descriptor>;
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using connection = aedis::connection<tcp_socket>;
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using stimer = net::use_awaitable_t<>::as_default_on_t<net::steady_timer>;
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// Chat over redis pubsub. To test, run this program from different
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// terminals and type messages to stdin. Use
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//
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// $ redis-cli monitor
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//
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// to monitor the message traffic.
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// Receives messages from other users.
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net::awaitable<void> push_receiver(std::shared_ptr<connection> conn)
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{
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for (std::vector<node<std::string>> resp;;) {
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co_await conn->async_receive_push(adapt(resp));
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print_push(resp);
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resp.clear();
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}
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}
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// Subscribes to the channels when a new connection is stablished.
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net::awaitable<void> reconnect(std::shared_ptr<connection> conn)
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{
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request req;
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req.push("SUBSCRIBE", "chat-channel");
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stimer timer{co_await net::this_coro::executor};
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endpoint ep{"127.0.0.1", "6379"};
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for (;;) {
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boost::system::error_code ec;
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co_await conn->async_run(ep, req, adapt(), {}, net::redirect_error(net::use_awaitable, ec));
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conn->reset_stream();
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std::cout << ec.message() << std::endl;
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timer.expires_after(std::chrono::seconds{1});
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co_await timer.async_wait();
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}
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}
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// Publishes messages to other users.
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net::awaitable<void> publisher(stream_descriptor& in, std::shared_ptr<connection> conn)
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{
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for (std::string msg;;) {
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auto n = co_await net::async_read_until(in, net::dynamic_buffer(msg, 1024), "\n");
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request req;
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req.push("PUBLISH", "chat-channel", msg);
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co_await conn->async_exec(req);
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msg.erase(0, n);
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}
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}
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auto main() -> int
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{
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try {
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net::io_context ioc{1};
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stream_descriptor in{ioc, ::dup(STDIN_FILENO)};
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auto conn = std::make_shared<connection>(ioc);
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co_spawn(ioc, publisher(in, conn), net::detached);
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co_spawn(ioc, push_receiver(conn), net::detached);
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co_spawn(ioc, reconnect(conn), net::detached);
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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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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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#else // defined(BOOST_ASIO_HAS_CO_AWAIT) && defined(BOOST_ASIO_HAS_POSIX_STREAM_DESCRIPTOR)
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auto main() -> int {std::cout << "Requires coroutine support." << std::endl; return 1;}
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#endif // defined(BOOST_ASIO_HAS_CO_AWAIT) && defined(BOOST_ASIO_HAS_POSIX_STREAM_DESCRIPTOR)
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