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redis/examples/async_pubsub.cpp
Marcelo Zimbres 9b69a89161 Changes:
- Improvements in the readme.
- Progresses with pubsub.
- Implements push types as part of response_base.
2021-01-09 12:53:20 +01:00

80 lines
2.0 KiB
C++

/* Copyright (c) 2019 - 2020 Marcelo Zimbres Silva (mzimbres at gmail dot 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 <boost/asio.hpp>
#include <aedis/aedis.hpp>
/* Implements a coroutine that writes commands in interval and one the
* reads the commands.
*/
namespace net = aedis::net;
namespace this_coro = net::this_coro;
using namespace aedis;
using tcp = net::ip::tcp;
using tcp_socket = net::use_awaitable_t<>::as_default_on_t<tcp::socket>;
using stimer = net::use_awaitable_t<>::as_default_on_t<net::steady_timer>;
net::awaitable<void> publisher(tcp_socket& socket)
{
auto ex = co_await this_coro::executor;
try {
resp::request req;
req.hello();
req.subscribe("channel");
req.subscribe("__keyspace@0__:user:*");
std::string buffer;
for (auto i = 0;; ++i) {
req.ping();
req.rpush("user:Marcelo", {i});
req.publish("channel", "Some message");
co_await async_write(socket, req);
req.clear();
stimer timer(ex, std::chrono::seconds{2});
co_await timer.async_wait();
}
} catch (std::exception const& e) {
std::cerr << "Error: " << e.what() << std::endl;
}
}
net::awaitable<void> subscriber()
{
auto ex = co_await this_coro::executor;
try {
tcp::resolver resv(ex);
auto const r = resv.resolve("127.0.0.1", "6379");
tcp_socket socket {ex};
co_await async_connect(socket, r);
co_spawn(ex, publisher(socket), net::detached);
std::string buffer;
for (;;) {
resp::response_array<std::string> res;
co_await resp::async_read(socket, buffer, res);
if (res.is_push())
print(res.push().value, "Push");
else
print(res.result, "Message");
}
} catch (std::exception const& e) {
std::cout << e.what() << std::endl;
}
}
int main()
{
net::io_context ioc {1};
co_spawn(ioc, subscriber(), net::detached);
ioc.run();
}