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73 lines
2.2 KiB
C++
73 lines
2.2 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/run.hpp>
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#include <boost/asio/use_awaitable.hpp>
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#include <boost/asio/redirect_error.hpp>
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#include <boost/asio/experimental/awaitable_operators.hpp>
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#include <iostream>
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#if defined(BOOST_ASIO_HAS_CO_AWAIT)
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namespace net = boost::asio;
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using namespace net::experimental::awaitable_operators;
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using endpoints = net::ip::tcp::resolver::results_type;
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using boost::redis::request;
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using boost::redis::response;
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using boost::redis::ignore_t;
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using boost::redis::async_run;
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using connection = boost::asio::use_awaitable_t<>::as_default_on_t<boost::redis::connection>;
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auto redir(boost::system::error_code& ec)
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{ return net::redirect_error(net::use_awaitable, ec); }
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struct address {
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std::string host;
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std::string port;
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};
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// For more info see
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// - https://redis.io/docs/manual/sentinel.
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// - https://redis.io/docs/reference/sentinel-clients.
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auto resolve_master_address(std::vector<address> const& endpoints) -> net::awaitable<address>
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{
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request req;
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req.push("SENTINEL", "get-master-addr-by-name", "mymaster");
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req.push("QUIT");
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auto conn = std::make_shared<connection>(co_await net::this_coro::executor);
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response<std::optional<std::array<std::string, 2>>, ignore_t> addr;
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for (auto ep : endpoints) {
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boost::system::error_code ec;
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co_await (async_run(*conn, ep.host, ep.port) && conn->async_exec(req, addr, redir(ec)));
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conn->reset_stream();
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if (std::get<0>(addr))
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co_return address{std::get<0>(addr).value().value().at(0), std::get<0>(addr).value().value().at(1)};
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}
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co_return address{};
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}
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auto co_main(std::string host, std::string port) -> net::awaitable<void>
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{
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// A list of sentinel addresses from which only one is responsive.
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// This simulates sentinels that are down.
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std::vector<address> const endpoints
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{ {"foo", "26379"}
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, {"bar", "26379"}
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, {host, port}
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};
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auto const ep = co_await resolve_master_address(endpoints);
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std::clog
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<< "Host: " << ep.host << "\n"
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<< "Port: " << ep.port << "\n"
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<< std::flush;
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}
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#endif // defined(BOOST_ASIO_HAS_CO_AWAIT)
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