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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
125 lines
3.7 KiB
C++
125 lines
3.7 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/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/posix/stream_descriptor.hpp>
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#include <boost/asio/read_until.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 <exception>
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#include <iostream>
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#include <unistd.h>
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#if defined(BOOST_ASIO_HAS_CO_AWAIT)
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#if defined(BOOST_ASIO_HAS_POSIX_STREAM_DESCRIPTOR)
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namespace asio = boost::asio;
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using asio::posix::stream_descriptor;
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using asio::signal_set;
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using boost::asio::async_read_until;
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using boost::asio::awaitable;
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using boost::asio::co_spawn;
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using boost::asio::consign;
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using boost::asio::detached;
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using boost::asio::dynamic_buffer;
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using boost::asio::redirect_error;
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using boost::redis::config;
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using boost::redis::connection;
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using boost::redis::generic_flat_response;
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using boost::redis::request;
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using boost::system::error_code;
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using namespace std::chrono_literals;
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// Chat over Redis pubsub. To test, run this program from multiple
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// terminals and type messages to stdin.
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namespace {
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auto rethrow_on_error = [](std::exception_ptr exc) {
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if (exc)
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std::rethrow_exception(exc);
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};
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auto receiver(std::shared_ptr<connection> conn) -> awaitable<void>
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{
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// Set the receive response, so pushes are stored in resp
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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 'channel'. Using request::subscribe()
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// (instead of request::push()) makes the connection re-subscribe
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// to 'channel' whenever it re-connects to the server.
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request req;
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req.subscribe({"channel"});
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co_await conn->async_exec(req);
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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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// Publishes stdin messages to a Redis channel.
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auto publisher(std::shared_ptr<stream_descriptor> in, std::shared_ptr<connection> conn)
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-> awaitable<void>
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{
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for (std::string msg;;) {
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auto n = co_await async_read_until(*in, dynamic_buffer(msg, 1024), "\n");
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request req;
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req.push("PUBLISH", "channel", msg);
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co_await conn->async_exec(req);
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msg.erase(0, n);
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}
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}
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} // namespace
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// Called from the main function (see main.cpp)
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auto co_main(config cfg) -> 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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auto stream = std::make_shared<stream_descriptor>(ex, ::dup(STDIN_FILENO));
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co_spawn(ex, receiver(conn), rethrow_on_error);
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co_spawn(ex, publisher(stream, conn), rethrow_on_error);
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conn->async_run(cfg, consign(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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stream->cancel();
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}
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#else // defined(BOOST_ASIO_HAS_POSIX_STREAM_DESCRIPTOR)
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auto co_main(config const&) -> awaitable<void>
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{
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std::cout << "Requires support for posix streams." << std::endl;
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co_return;
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}
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#endif // defined(BOOST_ASIO_HAS_POSIX_STREAM_DESCRIPTOR)
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#endif // defined(BOOST_ASIO_HAS_CO_AWAIT)
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