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connector.hpp
/* Copyright (c) 2018-2023 Marcelo Zimbres Silva (mzimbres@gmail.com)
*
* Distributed under the Boost Software License, Version 1.0. (See
* accompanying file LICENSE.txt)
*/
#ifndef BOOST_REDIS_CONNECTOR_HPP
#define BOOST_REDIS_CONNECTOR_HPP
#include <boost/redis/detail/helper.hpp>
#include <boost/redis/error.hpp>
#include <boost/asio/compose.hpp>
#include <boost/asio/connect.hpp>
#include <boost/asio/coroutine.hpp>
#include <boost/asio/experimental/parallel_group.hpp>
#include <boost/asio/ip/tcp.hpp>
#include <boost/asio/steady_timer.hpp>
#include <string>
#include <chrono>
namespace boost::redis::detail
{
template <class Connector, class Stream>
struct connect_op {
Connector* ctor_ = nullptr;
Stream* stream = nullptr;
asio::ip::tcp::resolver::results_type const* res_ = nullptr;
asio::coroutine coro{};
template <class Self>
void operator()( Self& self
, std::array<std::size_t, 2> const& order = {}
, system::error_code const& ec1 = {}
, asio::ip::tcp::endpoint const& ep= {}
, system::error_code const& ec2 = {})
{
BOOST_ASIO_CORO_REENTER (coro)
{
ctor_->timer_.expires_after(ctor_->timeout_);
BOOST_ASIO_CORO_YIELD
asio::experimental::make_parallel_group(
[this](auto token)
{
auto f = [](system::error_code const&, auto const&) { return true; };
return asio::async_connect(*stream, *res_, f, token);
},
[this](auto token) { return ctor_->timer_.async_wait(token);}
).async_wait(
asio::experimental::wait_for_one(),
std::move(self));
if (is_cancelled(self)) {
self.complete(asio::error::operation_aborted);
return;
}
switch (order[0]) {
case 0: {
ctor_->endpoint_ = ep;
self.complete(ec1);
} break;
case 1:
{
if (ec2) {
self.complete(ec2);
} else {
self.complete(error::connect_timeout);
}
} break;
default: BOOST_ASSERT(false);
}
}
}
};
template <class Executor>
class connector {
public:
using timer_type =
asio::basic_waitable_timer<
std::chrono::steady_clock,
asio::wait_traits<std::chrono::steady_clock>,
Executor>;
connector(Executor ex)
: timer_{ex}
{}
void set_config(config const& cfg)
{ timeout_ = cfg.connect_timeout; }
template <class Stream, class CompletionToken>
auto
async_connect(
Stream& stream,
asio::ip::tcp::resolver::results_type const& res,
CompletionToken&& token)
{
return asio::async_compose
< CompletionToken
, void(system::error_code)
>(connect_op<connector, Stream>{this, &stream, &res}, token, timer_);
}
std::size_t cancel(operation op)
{
switch (op) {
case operation::connect:
case operation::all:
timer_.cancel();
break;
default: /* ignore */;
}
return 0;
}
auto const& endpoint() const noexcept { return endpoint_;}
private:
template <class, class> friend struct connect_op;
timer_type timer_;
std::chrono::steady_clock::duration timeout_ = std::chrono::seconds{2};
asio::ip::tcp::endpoint endpoint_;
};
} // boost::redis::detail
#endif // BOOST_REDIS_CONNECTOR_HPP
boost::redis::operation
operation
Connection operations that can be cancelled.
Definition: operation.hpp:18
boost::redis::error::connect_timeout
@ connect_timeout
Connect timeout.
boost::redis::operation::all
@ all
Refers to all operations.
boost::redis::operation::connect
@ connect
Connect operation.