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d3e335942f
* Adds support for asio::cancel_after in connection::{async_exec, async_run}
* Adds cancel_after tests
* Adds an example on using asio::cancel_after
* Adds a discussion page on timeouts and the `cancel_if_unresponded` flag
close #226
50 lines
1.5 KiB
C++
50 lines
1.5 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/asio/cancel_after.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 <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 boost::redis::request;
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using boost::redis::response;
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using boost::redis::config;
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using boost::redis::connection;
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using namespace std::chrono_literals;
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// Called from the main function (see main.cpp)
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auto co_main(config cfg) -> asio::awaitable<void>
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{
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auto conn = std::make_shared<connection>(co_await asio::this_coro::executor);
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conn->async_run(cfg, asio::consign(asio::detached, conn));
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// A request containing only a ping command.
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request req;
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req.push("PING", "Hello world");
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// Response where the PONG response will be stored.
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response<std::string> resp;
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// Executes the request with a timeout. If the server is down,
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// async_exec will wait until it's back again, so it,
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// may suspend for a long time.
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// For this reason, it's good practice to set a timeout to requests with cancel_after.
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// If the request hasn't completed after 10 seconds, an exception will be thrown.
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co_await conn->async_exec(req, resp, asio::cancel_after(10s));
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conn->cancel();
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std::cout << "PING: " << std::get<0>(resp).value() << std::endl;
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}
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#endif // defined(BOOST_ASIO_HAS_CO_AWAIT)
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