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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 <boost/redis/connection.hpp>
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#include <boost/asio/deferred.hpp>
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#include <boost/asio/signal_set.hpp>
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#include <boost/asio/co_spawn.hpp>
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#include <boost/asio/detached.hpp>
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#include <boost/asio/redirect_error.hpp>
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#include <boost/asio/posix/stream_descriptor.hpp>
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#include <unistd.h>
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#include <iostream>
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#if defined(BOOST_ASIO_HAS_CO_AWAIT)
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#if defined(BOOST_ASIO_HAS_POSIX_STREAM_DESCRIPTOR)
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namespace net = boost::asio;
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using stream_descriptor = net::deferred_t::as_default_on_t<net::posix::stream_descriptor>;
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using signal_set = net::deferred_t::as_default_on_t<net::signal_set>;
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using boost::redis::request;
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using boost::redis::generic_response;
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using boost::redis::config;
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using boost::redis::connection;
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using boost::redis::ignore;
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using net::redirect_error;
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using net::use_awaitable;
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using boost::system::error_code;
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using namespace std::chrono_literals;
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// Chat over Redis pubsub. To test, run this program from multiple
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// terminals and type messages to stdin.
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auto
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receiver(std::shared_ptr<connection> conn) -> net::awaitable<void>
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{
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request req;
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req.push("SUBSCRIBE", "channel");
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while (conn->will_reconnect()) {
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// Subscribe to channels.
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co_await conn->async_exec(req, ignore, net::deferred);
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// Loop reading Redis push messages.
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for (generic_response resp;;) {
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error_code ec;
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co_await conn->async_receive(resp, redirect_error(use_awaitable, ec));
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if (ec)
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break; // Connection lost, break so we can reconnect to channels.
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std::cout
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<< resp.value().at(1).value
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<< " " << resp.value().at(2).value
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<< " " << resp.value().at(3).value
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<< std::endl;
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resp.value().clear();
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}
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}
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}
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// Publishes stdin messages to a Redis channel.
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auto publisher(std::shared_ptr<stream_descriptor> in, std::shared_ptr<connection> conn) -> net::awaitable<void>
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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", "channel", msg);
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co_await conn->async_exec(req, ignore, net::deferred);
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msg.erase(0, n);
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}
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}
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// Called from the main function (see main.cpp)
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auto co_main(config cfg) -> net::awaitable<void>
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{
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auto ex = co_await net::this_coro::executor;
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auto conn = std::make_shared<connection>(ex);
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auto stream = std::make_shared<stream_descriptor>(ex, ::dup(STDIN_FILENO));
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net::co_spawn(ex, receiver(conn), net::detached);
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net::co_spawn(ex, publisher(stream, conn), net::detached);
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conn->async_run(cfg, {}, net::consign(net::detached, conn));
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signal_set sig_set{ex, SIGINT, SIGTERM};
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co_await sig_set.async_wait();
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conn->cancel();
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stream->cancel();
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}
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#else // defined(BOOST_ASIO_HAS_POSIX_STREAM_DESCRIPTOR)
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auto co_main(config const&) -> net::awaitable<void>
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{
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std::cout << "Requires support for posix streams." << std::endl;
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co_return;
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}
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#endif // defined(BOOST_ASIO_HAS_POSIX_STREAM_DESCRIPTOR)
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#endif // defined(BOOST_ASIO_HAS_CO_AWAIT)
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