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82 lines
2.1 KiB
C++
82 lines
2.1 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 <iostream>
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#include <chrono>
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#include <aedis/aedis.hpp>
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#include "utils.ipp"
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using aedis::command;
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using aedis::resp3::serializer;
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using aedis::resp3::async_read;
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using aedis::resp3::adapt;
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using aedis::resp3::node;
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namespace net = aedis::net;
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using net::async_write;
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using net::buffer;
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/* In previous examples we sent some commands (ping) to redis and
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quit (closed) the connection. In this example we send a
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subscription to a channel and start reading server side messages
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indefinitely.
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Notice we store the id of the connection (attributed by the redis
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server) to be able to identify it (in logs for example).
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After starting the example you can test it by sending messages with
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the redis-client like this
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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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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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net::awaitable<void> subscriber()
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{
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auto socket = co_await connect();
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serializer<command> sr;
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sr.push(command::hello, "3");
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sr.push(command::subscribe, "channel1", "channel2");
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co_await async_write(socket, buffer(sr.request()));
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std::vector<node> resp;
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// Reads the response to the hello command.
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std::string buffer;
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co_await async_read(socket, buffer, adapt(resp));
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co_await async_read(socket, buffer);
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// Saves the id of this connection.
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auto const id = resp.at(8).data;
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// Loops to receive server pushes.
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for (;;) {
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resp.clear();
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co_await async_read(socket, buffer, adapt(resp));
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std::cout
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<< "Subscriber " << id << ":\n"
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<< resp << 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, subscriber(), net::detached);
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co_spawn(ioc, subscriber(), net::detached);
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co_spawn(ioc, subscriber(), net::detached);
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ioc.run();
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}
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/// \example subscriber.cpp
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