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cpp20_json.cpp
/* Copyright (c) 2018-2022 Marcelo Zimbres Silva (mzimbres@gmail.com)
*
* Distributed under the Boost Software License, Version 1.0. (See
* accompanying file LICENSE.txt)
*/
#include <boost/redis/connection.hpp>
#include <boost/asio/deferred.hpp>
#include <boost/asio/detached.hpp>
#include <boost/describe.hpp>
#include <boost/asio/consign.hpp>
#include <boost/asio/use_awaitable.hpp>
#include <string>
#include <iostream>
#if defined(BOOST_ASIO_HAS_CO_AWAIT)
#include <boost/json/serialize.hpp>
#include <boost/json/parse.hpp>
#include <boost/json/value_from.hpp>
#include <boost/json/value_to.hpp>
#include <boost/redis/resp3/serialization.hpp>
namespace asio = boost::asio;
using namespace boost::describe;
using boost::redis::request;
using boost::redis::response;
using boost::redis::ignore_t;
using boost::redis::config;
using boost::redis::connection;
// Struct that will be stored in Redis using json serialization.
struct user {
std::string name;
std::string age;
std::string country;
};
// The type must be described for serialization to work.
BOOST_DESCRIBE_STRUCT(user, (), (name, age, country))
// Boost.Redis customization points (example/json.hpp)
void boost_redis_to_bulk(std::string& to, user const& u)
{ boost::redis::resp3::boost_redis_to_bulk(to, boost::json::serialize(boost::json::value_from(u))); }
void boost_redis_from_bulk(user& u, std::string_view sv, boost::system::error_code&)
{ u = boost::json::value_to<user>(boost::json::parse(sv)); }
auto co_main(config cfg) -> asio::awaitable<void>
{
auto ex = co_await asio::this_coro::executor;
auto conn = std::make_shared<connection>(ex);
conn->async_run(cfg, {}, asio::consign(asio::detached, conn));
// user object that will be stored in Redis in json format.
user const u{"Joao", "58", "Brazil"};
// Stores and retrieves in the same request.
request req;
req.push("SET", "json-key", u); // Stores in Redis.
req.push("GET", "json-key"); // Retrieves from Redis.
response<ignore_t, user> resp;
co_await conn->async_exec(req, resp, asio::deferred);
conn->cancel();
// Prints the first ping
std::cout
<< "Name: " << std::get<1>(resp).value().name << "\n"
<< "Age: " << std::get<1>(resp).value().age << "\n"
<< "Country: " << std::get<1>(resp).value().country << "\n";
}
#endif // defined(BOOST_ASIO_HAS_CO_AWAIT)
boost::redis::connection
A basic_connection that type erases the executor.
Definition: connection.hpp:339
boost::redis::request
Creates Redis requests.
Definition: request.hpp:46
boost::redis::ignore_t
std::decay_t< decltype(std::ignore)> ignore_t
Type used to ignore responses.
Definition: ignore.hpp:31
boost::redis::response
std::tuple< adapter::result< Ts >... > response
Response with compile-time size.
Definition: response.hpp:25
boost::redis::config
Configure parameters used by the connection classes.
Definition: config.hpp:30