134 lines
3.5 KiB
C++
134 lines
3.5 KiB
C++
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/* Copyright (c) 2018-2023 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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#ifndef BOOST_REDIS_CONNECTOR_HPP
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#define BOOST_REDIS_CONNECTOR_HPP
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#include <boost/redis/detail/helper.hpp>
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#include <boost/redis/error.hpp>
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#include <boost/asio/compose.hpp>
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#include <boost/asio/connect.hpp>
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#include <boost/asio/coroutine.hpp>
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#include <boost/asio/experimental/parallel_group.hpp>
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#include <boost/asio/ip/tcp.hpp>
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#include <boost/asio/steady_timer.hpp>
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#include <string>
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#include <chrono>
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namespace boost::redis::detail
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{
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template <class Connector, class Stream>
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struct connect_op {
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Connector* ctor_ = nullptr;
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Stream* stream = nullptr;
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asio::ip::tcp::resolver::results_type const* res_ = nullptr;
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asio::coroutine coro{};
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template <class Self>
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void operator()( Self& self
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, std::array<std::size_t, 2> const& order = {}
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, system::error_code const& ec1 = {}
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, asio::ip::tcp::endpoint const& ep= {}
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, system::error_code const& ec2 = {})
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{
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BOOST_ASIO_CORO_REENTER (coro)
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{
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ctor_->timer_.expires_after(ctor_->timeout_);
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BOOST_ASIO_CORO_YIELD
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asio::experimental::make_parallel_group(
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[this](auto token)
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{
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auto f = [](system::error_code const&, auto const&) { return true; };
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return asio::async_connect(*stream, *res_, f, token);
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},
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[this](auto token) { return ctor_->timer_.async_wait(token);}
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).async_wait(
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asio::experimental::wait_for_one(),
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std::move(self));
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if (is_cancelled(self)) {
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self.complete(asio::error::operation_aborted);
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return;
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}
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switch (order[0]) {
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case 0: {
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ctor_->endpoint_ = ep;
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self.complete(ec1);
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} break;
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case 1:
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{
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if (ec2) {
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self.complete(ec2);
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} else {
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self.complete(error::connect_timeout);
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}
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} break;
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default: BOOST_ASSERT(false);
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}
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}
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}
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};
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template <class Executor>
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class connector {
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public:
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using timer_type =
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asio::basic_waitable_timer<
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std::chrono::steady_clock,
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asio::wait_traits<std::chrono::steady_clock>,
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Executor>;
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connector(Executor ex)
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: timer_{ex}
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{}
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void set_config(config const& cfg)
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{ timeout_ = cfg.connect_timeout; }
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template <class Stream, class CompletionToken>
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auto
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async_connect(
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Stream& stream,
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asio::ip::tcp::resolver::results_type const& res,
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CompletionToken&& token)
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{
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return asio::async_compose
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< CompletionToken
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, void(system::error_code)
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>(connect_op<connector, Stream>{this, &stream, &res}, token, timer_);
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}
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std::size_t cancel(operation op)
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{
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switch (op) {
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case operation::connect:
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case operation::all:
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timer_.cancel();
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break;
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default: /* ignore */;
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}
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return 0;
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}
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auto const& endpoint() const noexcept { return endpoint_;}
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private:
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template <class, class> friend struct connect_op;
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timer_type timer_;
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std::chrono::steady_clock::duration timeout_ = std::chrono::seconds{2};
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asio::ip::tcp::endpoint endpoint_;
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};
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} // boost::redis::detail
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#endif // BOOST_REDIS_CONNECTOR_HPP
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