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102 lines
2.7 KiB
C++
102 lines
2.7 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/redis/logger.hpp>
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#include <boost/asio/awaitable.hpp>
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#include <boost/asio/use_awaitable.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/consign.hpp>
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#include <boost/asio/redirect_error.hpp>
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#include <boost/asio/signal_set.hpp>
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#include <iostream>
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#if defined(BOOST_ASIO_HAS_CO_AWAIT)
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namespace asio = boost::asio;
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using namespace std::chrono_literals;
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using boost::redis::request;
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using boost::redis::generic_response;
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using boost::redis::consume_one;
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using boost::redis::logger;
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using boost::redis::config;
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using boost::redis::ignore;
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using boost::redis::error;
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using boost::system::error_code;
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using boost::redis::connection;
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using asio::signal_set;
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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 server pushes.
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auto
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receiver(std::shared_ptr<connection> conn) -> asio::awaitable<void>
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{
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request req;
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req.push("SUBSCRIBE", "channel");
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generic_response resp;
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conn->set_receive_response(resp);
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// Loop while reconnection is enabled
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while (conn->will_reconnect()) {
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// Reconnect to the channels.
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co_await conn->async_exec(req, ignore);
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// Loop reading Redis pushs messages.
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for (error_code ec;;) {
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// First tries to read any buffered pushes.
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conn->receive(ec);
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if (ec == error::sync_receive_push_failed) {
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ec = {};
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co_await conn->async_receive(asio::redirect_error(asio::use_awaitable, ec));
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}
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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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consume_one(resp);
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}
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}
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}
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auto co_main(config cfg) -> asio::awaitable<void>
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{
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auto ex = co_await asio::this_coro::executor;
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auto conn = std::make_shared<connection>(ex);
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asio::co_spawn(ex, receiver(conn), asio::detached);
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conn->async_run(cfg, {}, asio::consign(asio::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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}
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#endif // defined(BOOST_ASIO_HAS_CO_AWAIT)
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