mirror of
https://github.com/boostorg/redis.git
synced 2026-01-19 04:42:09 +00:00
98 lines
3.1 KiB
C++
98 lines
3.1 KiB
C++
/* 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/co_spawn.hpp>
|
|
#include <boost/asio/detached.hpp>
|
|
#include <boost/asio/consign.hpp>
|
|
#include <boost/asio/signal_set.hpp>
|
|
#include <boost/asio/awaitable.hpp>
|
|
#include <iostream>
|
|
|
|
#if defined(BOOST_ASIO_HAS_CO_AWAIT)
|
|
|
|
#include <memory>
|
|
#include <string>
|
|
#include <thread>
|
|
#include <vector>
|
|
|
|
namespace net = boost::asio;
|
|
using boost::redis::config;
|
|
using boost::redis::generic_response;
|
|
using boost::redis::operation;
|
|
using boost::redis::request;
|
|
using boost::redis::connection;
|
|
using net::signal_set;
|
|
|
|
auto stream_reader(std::shared_ptr<connection> conn) -> net::awaitable<void>
|
|
{
|
|
std::string redisStreamKey_;
|
|
request req;
|
|
generic_response resp;
|
|
|
|
std::string stream_id{"$"};
|
|
std::string const field = "myfield";
|
|
|
|
for (;;) {
|
|
req.push("XREAD", "BLOCK", "0", "STREAMS", "test-topic", stream_id);
|
|
co_await conn->async_exec(req, resp);
|
|
|
|
//std::cout << "Response: ";
|
|
//for (auto i = 0UL; i < resp->size(); ++i) {
|
|
// std::cout << resp->at(i).value << ", ";
|
|
//}
|
|
//std::cout << std::endl;
|
|
|
|
// The following approach was taken in order to be able to
|
|
// deal with the responses, as generated by redis in the case
|
|
// that there are multiple stream 'records' within a single
|
|
// generic_response. The nesting and number of values in
|
|
// resp.value() are different, depending on the contents
|
|
// of the stream in redis. Uncomment the above commented-out
|
|
// code for examples while running the XADD command.
|
|
|
|
std::size_t item_index = 0;
|
|
while (item_index < std::size(resp.value())) {
|
|
auto const& val = resp.value().at(item_index).value;
|
|
|
|
if (field.compare(val) == 0) {
|
|
// We've hit a myfield field.
|
|
// The streamId is located at item_index - 2
|
|
// The payload is located at item_index + 1
|
|
stream_id = resp.value().at(item_index - 2).value;
|
|
std::cout
|
|
<< "StreamId: " << stream_id << ", "
|
|
<< "MyField: " << resp.value().at(item_index + 1).value
|
|
<< std::endl;
|
|
++item_index; // We can increase so we don't read this again
|
|
}
|
|
|
|
++item_index;
|
|
}
|
|
|
|
req.clear();
|
|
resp.value().clear();
|
|
}
|
|
}
|
|
|
|
// Run this in another terminal:
|
|
// redis-cli -r 100000 -i 0.0001 XADD "test-topic" "*" "myfield" "myfieldvalue1"
|
|
auto co_main(config cfg) -> net::awaitable<void>
|
|
{
|
|
auto ex = co_await net::this_coro::executor;
|
|
auto conn = std::make_shared<connection>(ex);
|
|
net::co_spawn(ex, stream_reader(conn), net::detached);
|
|
|
|
// Disable health checks.
|
|
cfg.health_check_interval = std::chrono::seconds::zero();
|
|
conn->async_run(cfg, {}, net::consign(net::detached, conn));
|
|
|
|
signal_set sig_set(ex, SIGINT, SIGTERM);
|
|
co_await sig_set.async_wait();
|
|
conn->cancel();
|
|
}
|
|
#endif // defined(BOOST_ASIO_HAS_CO_AWAIT)
|