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97 lines
2.6 KiB
C++
97 lines
2.6 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 <string>
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#include <vector>
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#include <iostream>
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#include <boost/asio.hpp>
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#include <boost/asio/experimental/as_tuple.hpp>
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#include <aedis.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 aedis::adapt;
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using aedis::resp3::request;
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using aedis::resp3::node;
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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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using net::experimental::as_tuple;
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/* In this example we send a subscription to a channel and start
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* reading server side messages indefinitely.
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*
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* After starting the example you can test it by sending messages with
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* redis-cli like this
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*
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* $ redis-cli -3
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* 127.0.0.1:6379> PUBLISH channel1 some-message
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* (integer) 3
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* 127.0.0.1:6379>
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*
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* The messages will then appear on the terminal you are running the
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* example.
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*
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* To test reconnection try for example to close all clients currently
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* connected to the Redis instance
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*
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* $ redis-cli
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* > CLIENT kill TYPE pubsub
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*/
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net::awaitable<void> reader(std::shared_ptr<connection> db)
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{
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try {
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for (std::vector<node<std::string>> resp;;) {
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co_await db->async_receive(adapt(resp));
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std::cout
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<< "Event: " << resp.at(1).value << "\n"
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<< "Channel: " << resp.at(2).value << "\n"
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<< "Message: " << resp.at(3).value << "\n"
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<< std::endl;
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resp.clear();
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}
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} catch (std::exception const& e) {
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std::cerr << "Reader: " << e.what() << std::endl;
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}
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}
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net::awaitable<void> reconnect(std::shared_ptr<connection> db)
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{
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auto ex = co_await net::this_coro::executor;
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request req;
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req.push("SUBSCRIBE", "channel");
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net::steady_timer timer{ex};
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for (;;) {
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co_await db->async_run(req, adapt(), as_tuple(net::use_awaitable));
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// Waits one second and tries again.
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timer.expires_after(std::chrono::seconds{1});
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co_await timer.async_wait(net::use_awaitable);
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}
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}
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int main()
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{
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try {
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net::io_context ioc;
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auto db = std::make_shared<connection>(ioc);
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net::co_spawn(ioc, reader(db), net::detached);
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net::co_spawn(ioc, reconnect(db), net::detached);
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net::signal_set signals(ioc, SIGINT, SIGTERM);
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signals.async_wait([&](auto, auto){ ioc.stop(); });
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ioc.run();
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} catch (std::exception const& e) {
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std::cerr << "Error: " << e.what() << std::endl;
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}
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}
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