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132 lines
3.9 KiB
C++
132 lines
3.9 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 <map>
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#include <vector>
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#include <iostream>
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#include <boost/asio.hpp>
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#if defined(BOOST_ASIO_HAS_CO_AWAIT)
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#include <boost/asio/experimental/awaitable_operators.hpp>
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#include <aedis.hpp>
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#include "print.hpp"
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// Include this in no more than one .cpp file.
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#include <aedis/src.hpp>
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namespace net = boost::asio;
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using namespace net::experimental::awaitable_operators;
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using aedis::adapt;
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using aedis::resp3::request;
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using tcp_socket = net::use_awaitable_t<>::as_default_on_t<net::ip::tcp::socket>;
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using connection = aedis::connection<tcp_socket>;
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// To avoid verbosity.
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auto redir(boost::system::error_code& ec)
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{
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return net::redirect_error(net::use_awaitable, ec);
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}
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// Sends some containers.
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auto send(net::ip::tcp::resolver::results_type const& endpoints) -> net::awaitable<void>
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{
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std::vector<int> vec
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{1, 2, 3, 4, 5, 6};
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std::map<std::string, std::string> map
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{{"key1", "value1"}, {"key2", "value2"}, {"key3", "value3"}};
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request req;
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req.get_config().cancel_on_connection_lost = true;
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req.push("HELLO", 3);
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req.push_range("RPUSH", "rpush-key", vec);
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req.push_range("HSET", "hset-key", map);
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req.push("QUIT");
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connection conn{co_await net::this_coro::executor};
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co_await net::async_connect(conn.next_layer(), endpoints);
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co_await (conn.async_run() || conn.async_exec(req));
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}
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// Retrieves a Redis hash as an std::map.
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auto
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retrieve_hashes(
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net::ip::tcp::resolver::results_type const& endpoints) -> net::awaitable<std::map<std::string, std::string>>
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{
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request req;
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req.get_config().cancel_on_connection_lost = true;
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req.push("HELLO", 3);
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req.push("HGETALL", "hset-key");
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req.push("QUIT");
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std::map<std::string, std::string> ret;
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auto resp = std::tie(std::ignore, ret, std::ignore);
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connection conn{co_await net::this_coro::executor};
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co_await net::async_connect(conn.next_layer(), endpoints);
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co_await (conn.async_run() || conn.async_exec(req, adapt(resp)));
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co_return std::move(ret);
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}
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// Retrieves as a data structure.
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auto transaction(net::ip::tcp::resolver::results_type const& endpoints) -> net::awaitable<void>
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{
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request req;
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req.get_config().cancel_on_connection_lost = true;
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req.push("HELLO", 3);
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req.push("MULTI");
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req.push("LRANGE", "rpush-key", 0, -1); // Retrieves
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req.push("HGETALL", "hset-key"); // Retrieves
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req.push("EXEC");
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req.push("QUIT");
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std::tuple<
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aedis::ignore, // hello
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aedis::ignore, // multi
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aedis::ignore, // lrange
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aedis::ignore, // hgetall
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std::tuple<std::optional<std::vector<int>>, std::optional<std::map<std::string, std::string>>>, // exec
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aedis::ignore // quit
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> resp;
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connection conn{co_await net::this_coro::executor};
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co_await net::async_connect(conn.next_layer(), endpoints);
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co_await (conn.async_run() || conn.async_exec(req, adapt(resp)));
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print(std::get<0>(std::get<4>(resp)).value());
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print(std::get<1>(std::get<4>(resp)).value());
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}
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net::awaitable<void> async_main()
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{
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try {
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net::ip::tcp::resolver resv{co_await net::this_coro::executor};
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auto addrs = co_await resv.async_resolve("127.0.0.1", "6379", net::use_awaitable);
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co_await send(addrs);
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co_await transaction(addrs);
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auto const hashes = co_await retrieve_hashes(addrs);
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print(hashes);
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} catch (std::exception const& e) {
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std::cerr << e.what() << std::endl;
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}
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}
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auto main() -> int
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{
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try {
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net::io_context ioc;
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net::co_spawn(ioc, async_main(), net::detached);
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ioc.run();
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} catch (...) {
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std::cerr << "Error." << std::endl;
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}
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}
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#else // defined(BOOST_ASIO_HAS_CO_AWAIT)
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auto main() -> int {std::cout << "Requires coroutine support." << std::endl; return 0;}
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#endif // defined(BOOST_ASIO_HAS_CO_AWAIT)
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