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redis/examples/low_level/async_intro.cpp
2022-04-03 20:54:39 +02:00

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2.4 KiB
C++

/* Copyright (c) 2019 Marcelo Zimbres Silva (mzimbres.gmail.com)
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/.
*/
#include <iostream>
#include <boost/asio/use_awaitable.hpp>
#include <boost/asio/detached.hpp>
#include <boost/asio/co_spawn.hpp>
#include <aedis/aedis.hpp>
#include <aedis/src.hpp>
namespace net = boost::asio;
namespace resp3 = aedis::resp3;
using aedis::redis::command;
using aedis::resp3::make_serializer;
using aedis::adapter::adapt;
using net::ip::tcp;
using net::write;
using net::buffer;
using net::dynamic_buffer;
using tcp_socket = net::use_awaitable_t<>::as_default_on_t<net::ip::tcp::socket>;
using response_type = std::tuple<std::string, std::optional<std::string>>;
net::awaitable<void> example()
{
auto ex = co_await net::this_coro::executor;
tcp::resolver resv{ex};
auto const res = resv.resolve("127.0.0.1", "6379");
tcp_socket socket{ex};
co_await socket.async_connect(*std::begin(res));
std::string request;
auto sr = make_serializer(request);
sr.push(command::hello, 3);
sr.push(command::multi);
sr.push(command::ping, "Some message.");
sr.push(command::set, "low-level-key", "some content", "EX", "2");
sr.push(command::exec);
sr.push(command::quit);
co_await net::async_write(socket, buffer(request));
std::tuple<std::string, std::optional<std::string>> response;
std::string buffer;
co_await resp3::async_read(socket, dynamic_buffer(buffer));
co_await resp3::async_read(socket, dynamic_buffer(buffer)); // multi
co_await resp3::async_read(socket, dynamic_buffer(buffer)); // ping
co_await resp3::async_read(socket, dynamic_buffer(buffer)); // set
co_await resp3::async_read(socket, dynamic_buffer(buffer), adapt(response));
co_await resp3::async_read(socket, dynamic_buffer(buffer));
std::cout
<< "Ping: " << std::get<0>(response) << "\n"
<< "Get (has_value): " << std::get<1>(response).has_value()
<< std::endl;
if (std::get<1>(response).has_value())
std::cout << "Get (value): " << std::get<1>(response).value() << std::endl;
}
int main()
{
try {
net::io_context ioc;
net::co_spawn(ioc, example(), net::detached);
ioc.run();
} catch (std::exception const& e) {
std::cerr << e.what() << std::endl;
}
}