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104 lines
2.5 KiB
C++
104 lines
2.5 KiB
C++
/* Copyright (c) 2019 - 2021 Marcelo Zimbres Silva (mzimbres at gmail dot com)
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/.
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*/
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#include <string>
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#include <iostream>
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#include <charconv>
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#include <aedis/aedis.hpp>
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#include "types.hpp"
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#include "utils.ipp"
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using aedis::command;
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using aedis::resp3::type;
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using aedis::resp3::request;
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using aedis::resp3::response;
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using aedis::resp3::async_read;
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using aedis::resp3::response_base;
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namespace net = aedis::net;
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/* Illustrates how to write a custom response. Useful to users
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* seeking to improve performance and reduce latency.
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*/
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/* A response that parses the result of a response directly in an int
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* variable. The same reasoning can be applied for keys containing
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* e.g. json strings.
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*
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*/
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struct response_int : response_base {
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int result;
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void
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add(type t,
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std::size_t aggregate_size,
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std::size_t depth,
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char const* data,
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std::size_t data_size) override
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{
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auto r = std::from_chars(data, data + data_size, result);
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if (r.ec == std::errc::invalid_argument)
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throw std::runtime_error("from_chars: Unable to convert");
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}
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};
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// To ignore the reponse of a command use the response base class.
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using response_ignore = response_base;
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/* This coroutine avoids reading the response to a get command in a
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* temporary buffer by using a custom response. This is always
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* possible when the application knows the data type being stored in
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* a specific key.
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*/
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net::awaitable<void> example()
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{
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try {
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request req;
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req.push(command::hello, 3);
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req.push(command::set, "key", 42);
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req.push(command::get, "key");
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req.push(command::quit);
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auto socket = co_await make_connection("127.0.0.1", "6379");
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co_await async_write(socket, req);
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std::string buffer;
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response_ignore ignore;
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// hello
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co_await async_read(socket, buffer, ignore);
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// set
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co_await async_read(socket, buffer, ignore);
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// get
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response_int int_resp;
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co_await async_read(socket, buffer, int_resp);
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std::cout << int_resp.result << std::endl;
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// quit.
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co_await async_read(socket, buffer, ignore);
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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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int main()
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{
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net::io_context ioc;
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co_spawn(ioc, example(), net::detached);
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ioc.run();
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}
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/// \example custom_response1.cpp
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