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/* Copyright (c) 2018-2022 Marcelo Zimbres Silva (mzimbres@gmail.com)
*
* Distributed under the Boost Software License, Version 1.0. (See
* accompanying file LICENSE.txt)
*/
#include <boost/redis/connection.hpp>
#include <boost/redis/logger.hpp>
#include <boost/asio/awaitable.hpp>
#include <boost/asio/co_spawn.hpp>
#include <boost/asio/consign.hpp>
#include <boost/asio/detached.hpp>
#include <boost/asio/redirect_error.hpp>
#include <boost/asio/signal_set.hpp>
#include <boost/asio/use_awaitable.hpp>
#include <iostream>
#if defined(BOOST_ASIO_HAS_CO_AWAIT)
namespace asio = boost::asio;
using namespace std::chrono_literals;
using boost::redis::request;
using boost::redis::generic_response;
using boost::redis::consume_one;
using boost::redis::logger;
using boost::redis::config;
using boost::redis::ignore;
using boost::redis::error;
using boost::system::error_code;
using boost::redis::connection;
using asio::signal_set;
/* This example will subscribe and read pushes indefinitely.
*
* To test send messages with redis-cli
*
* $ redis-cli -3
* 127.0.0.1:6379> PUBLISH channel some-message
* (integer) 3
* 127.0.0.1:6379>
*
* To test reconnection try, for example, to close all clients currently
* connected to the Redis instance
*
* $ redis-cli
* > CLIENT kill TYPE pubsub
*/
// Receives server pushes.
auto receiver(std::shared_ptr<connection> conn) -> asio::awaitable<void>
{
request req;
req.push("SUBSCRIBE", "channel");
generic_response resp;
conn->set_receive_response(resp);
// Loop while reconnection is enabled
while (conn->will_reconnect()) {
// Reconnect to the channels.
co_await conn->async_exec(req, ignore);
// Loop reading Redis pushs messages.
for (error_code ec;;) {
// First tries to read any buffered pushes.
conn->receive(ec);
if (ec == error::sync_receive_push_failed) {
ec = {};
co_await conn->async_receive(asio::redirect_error(asio::use_awaitable, ec));
}
if (ec)
break; // Connection lost, break so we can reconnect to channels.
std::cout << resp.value().at(1).value << " " << resp.value().at(2).value << " "
<< resp.value().at(3).value << std::endl;
consume_one(resp);
}
}
}
auto co_main(config cfg) -> asio::awaitable<void>
{
auto ex = co_await asio::this_coro::executor;
auto conn = std::make_shared<connection>(ex);
asio::co_spawn(ex, receiver(conn), asio::detached);
conn->async_run(cfg, asio::consign(asio::detached, conn));
signal_set sig_set(ex, SIGINT, SIGTERM);
co_await sig_set.async_wait();
conn->cancel();
}
#endif // defined(BOOST_ASIO_HAS_CO_AWAIT)
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