114 lines
2.5 KiB
C++
114 lines
2.5 KiB
C++
#ifndef ADAPTERS_BOOST_ASIO_UDP_RECEIVE_FROM_AREQ_H
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#define ADAPTERS_BOOST_ASIO_UDP_RECEIVE_FROM_AREQ_H
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#include <boostAsioLinkageFix.h>
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#include <atomic>
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#include <coroutine>
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#include <memory>
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#include <boost/asio/buffer.hpp>
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#include <boost/asio/io_context.hpp>
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#include <boost/asio/ip/udp.hpp>
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#include <boost/asio/post.hpp>
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#include <boost/system/error_code.hpp>
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namespace adapters::boostAsio {
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/** Coroutine awaiter wrapping boost::asio::ip::udp::socket::async_receive_from.
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*
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* Resumes on resumeIoContext when the receive completes or fails.
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*/
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class UdpReceiveFromAReq
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{
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public:
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struct Result
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{
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boost::system::error_code ec;
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std::size_t nbytes = 0;
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};
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struct AsyncState
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{
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std::atomic<bool> settled{false};
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Result result;
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std::coroutine_handle<> callerSchedHandle;
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};
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UdpReceiveFromAReq(
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boost::asio::io_context &resumeIoContext,
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boost::asio::ip::udp::socket &socket,
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const boost::asio::mutable_buffer &buffer,
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boost::asio::ip::udp::endpoint &senderEndpoint)
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: asyncState(std::make_shared<AsyncState>()),
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resumeIoContext(resumeIoContext)
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{
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socket.async_receive_from(
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buffer, senderEndpoint,
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[this](const boost::system::error_code &error, std::size_t nbytes)
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{
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onReceiveComplete(error, nbytes);
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});
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}
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bool await_ready() const noexcept
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{
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return asyncState->settled.load(std::memory_order_acquire);
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}
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bool await_suspend(std::coroutine_handle<> caller) noexcept
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{
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if (asyncState->settled.load(std::memory_order_acquire)) {
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return false;
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}
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asyncState->callerSchedHandle = caller;
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return true;
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}
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Result await_resume() const noexcept
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{
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return asyncState->result;
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}
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private:
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void onReceiveComplete(
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const boost::system::error_code &error, std::size_t nbytes)
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{
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if (asyncState->settled.exchange(true)) {
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return;
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}
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asyncState->result.ec = error;
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asyncState->result.nbytes = nbytes;
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signalSettledAndResumeCaller();
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}
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void signalSettledAndResumeCaller()
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{
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std::coroutine_handle<> handle = asyncState->callerSchedHandle;
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if (!handle) {
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return;
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}
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boost::asio::post(resumeIoContext, handle);
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}
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std::shared_ptr<AsyncState> asyncState;
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boost::asio::io_context &resumeIoContext;
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};
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inline auto getUdpReceiveFromAReqAwaiter(
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boost::asio::io_context &resumeIoContext,
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boost::asio::ip::udp::socket &socket,
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const boost::asio::mutable_buffer &buffer,
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boost::asio::ip::udp::endpoint &senderEndpoint)
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{
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return UdpReceiveFromAReq(
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resumeIoContext, socket, buffer, senderEndpoint);
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}
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} // namespace adapters::boostAsio
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#endif // ADAPTERS_BOOST_ASIO_UDP_RECEIVE_FROM_AREQ_H
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