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89 lines
2.4 KiB
C++
89 lines
2.4 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 <boost/asio.hpp>
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#include <aedis.hpp>
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#include <aedis/src.hpp>
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#include "unistd.h"
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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 aedis::adapt;
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using aedis::resp3::request;
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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 connection = aedis::connection<tcp_socket>;
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using response_type = std::vector<aedis::resp3::node<std::string>>;
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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. You may also want to run
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//
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// $ redis-cli
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// > monitor
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//
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// To see the message traffic.
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net::awaitable<void> reader(std::shared_ptr<connection> db)
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{
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try {
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request req;
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req.push("HELLO", 3);
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req.push("SUBSCRIBE", "chat-channel");
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co_await db->async_exec(req);
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for (response_type resp;;) {
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co_await db->async_read_push(adapt(resp));
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std::cout << "> " << resp.at(3).value;
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resp.clear();
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}
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} catch (std::exception const&) {
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}
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}
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net::awaitable<void>
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run(net::posix::stream_descriptor& in, std::shared_ptr<connection> db)
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{
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try {
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for (std::string msg;;) {
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std::size_t n = co_await net::async_read_until(in, net::dynamic_buffer(msg, 1024), "\n", net::use_awaitable);
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request req;
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req.push("PUBLISH", "chat-channel", msg);
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co_await db->async_exec(req);
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msg.erase(0, n);
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}
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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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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::posix::stream_descriptor in{ioc, ::dup(STDIN_FILENO)};
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auto db = std::make_shared<connection>(ioc);
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co_spawn(ioc, run(in, db), net::detached);
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co_spawn(ioc, reader(db), net::detached);
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db->async_run("127.0.0.1", "6379", [](auto ec) {
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std::cout << ec.message() << std::endl;
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});
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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_POSIX_STREAM_DESCRIPTOR)
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int main() {}
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#endif // defined(BOOST_ASIO_HAS_POSIX_STREAM_DESCRIPTOR)
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