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