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96 lines
2.6 KiB
C++
96 lines
2.6 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 <vector>
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#include <iostream>
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#include <tuple>
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#include <boost/asio.hpp>
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#if defined(BOOST_ASIO_HAS_CO_AWAIT)
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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 stimer = net::use_awaitable_t<>::as_default_on_t<net::steady_timer>;
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using connection = aedis::connection<tcp_socket>;
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/* This example will subscribe and read pushes indefinitely.
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*
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* To test send messages with redis-cli
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*
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* $ redis-cli -3
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* 127.0.0.1:6379> PUBLISH channel some-message
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* (integer) 3
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* 127.0.0.1:6379>
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*
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* To test reconnection try, for example, to close all clients currently
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* connected to the Redis instance
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*
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* $ redis-cli
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* > CLIENT kill TYPE pubsub
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*/
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// Receives pushes.
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net::awaitable<void> push_receiver(std::shared_ptr<connection> db)
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{
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for (std::vector<node<std::string>> resp;;) {
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co_await db->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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// See
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// - https://redis.io/docs/manual/sentinel.
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// - https://redis.io/docs/reference/sentinel-clients.
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net::awaitable<void> reconnect(std::shared_ptr<connection> db)
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{
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request req;
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req.push("SUBSCRIBE", "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 db->async_run(ep, req, adapt(), {}, net::redirect_error(net::use_awaitable, ec));
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db->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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int main()
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{
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try {
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net::io_context ioc;
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auto db = std::make_shared<connection>(ioc);
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net::co_spawn(ioc, push_receiver(db), net::detached);
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net::co_spawn(ioc, reconnect(db), 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 << "Error: " << e.what() << std::endl;
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}
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}
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#else // defined(BOOST_ASIO_HAS_CO_AWAIT)
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int main() {std::cout << "Requires coroutine support." << std::endl; return 1;}
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#endif // defined(BOOST_ASIO_HAS_CO_AWAIT)
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