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69 lines
2.1 KiB
C++
69 lines
2.1 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 <iostream>
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#include <boost/asio.hpp>
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#if defined(BOOST_ASIO_HAS_CO_AWAIT)
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#include <boost/asio/experimental/awaitable_operators.hpp>
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#include <boost/redis.hpp>
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#include <boost/redis/check_health.hpp>
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namespace net = boost::asio;
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using namespace net::experimental::awaitable_operators;
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using steady_timer = net::use_awaitable_t<>::as_default_on_t<net::steady_timer>;
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using boost::redis::request;
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using boost::redis::async_run;
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using boost::redis::generic_response;
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using boost::redis::async_check_health;
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using connection = boost::asio::use_awaitable_t<>::as_default_on_t<boost::redis::connection>;
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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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auto receiver(std::shared_ptr<connection> conn) -> net::awaitable<void>
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{
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for (generic_response resp;;) {
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co_await conn->async_receive(resp);
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std::cout << resp.value().at(1).value << " " << resp.value().at(2).value << " " << resp.value().at(3).value << std::endl;
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resp.value().clear();
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}
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}
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auto co_main(std::string host, std::string port) -> 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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steady_timer timer{ex};
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request req;
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req.push("HELLO", 3);
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req.push("SUBSCRIBE", "channel");
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// The loop will reconnect on connection lost. To exit type Ctrl-C twice.
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for (;;) {
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co_await ((async_run(*conn, host, port) || async_check_health(*conn) || receiver(conn)) && conn->async_exec(req));
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conn->reset_stream();
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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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#endif // defined(BOOST_ASIO_HAS_CO_AWAIT)
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