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bea547481a
Adds request::{subscribe, unsubscribe, psubscribe, punsubscribe}. When requests created with these functions are executed successfully, the created subscriptions are tracked and restore on re-connection.
close #367
100 lines
3.0 KiB
C++
100 lines
3.0 KiB
C++
/* Copyright (c) 2018-2025 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/awaitable.hpp>
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#include <boost/asio/co_spawn.hpp>
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#include <boost/asio/consign.hpp>
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#include <boost/asio/detached.hpp>
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#include <boost/asio/experimental/channel_error.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 <boost/asio/use_awaitable.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_flat_response;
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using boost::redis::config;
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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 mychannel 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 receiver(std::shared_ptr<connection> conn) -> asio::awaitable<void>
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{
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generic_flat_response resp;
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conn->set_receive_response(resp);
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// Subscribe to the channel 'mychannel'. You can add any number of channels here.
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request req;
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req.subscribe({"mychannel"});
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co_await conn->async_exec(req);
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// You're now subscribed to 'mychannel'. Pushes sent over this channel will be stored
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// in resp. If the connection encounters a network error and reconnects to the server,
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// it will automatically subscribe to 'mychannel' again. This is transparent to the user.
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// You need to use specialized request::subscribe() function (instead of request::push)
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// to enable this behavior.
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// Loop to read Redis push messages.
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for (error_code ec;;) {
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// Wait for pushes
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co_await conn->async_receive2(asio::redirect_error(ec));
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// Check for errors and cancellations
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if (ec && (ec != asio::experimental::error::channel_cancelled || !conn->will_reconnect())) {
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std::cerr << "Error during receive2: " << ec << std::endl;
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break;
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}
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// The response must be consumed without suspending the
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// coroutine i.e. without the use of async operations.
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for (auto const& elem : resp.value().get_view())
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std::cout << elem.value << "\n";
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std::cout << std::endl;
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resp.value().clear();
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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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