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// // Copyright (c) 2023-2025 Ivica Siladic, Bruno Iljazovic, Korina Simicevic // // Distributed under the Boost Software License, Version 1.0. // (See accompanying file LICENSE or copy at http://www.boost.org/LICENSE_1_0.txt) // #ifndef BOOST_MQTT5_ASYNC_SENDER_HPP #define BOOST_MQTT5_ASYNC_SENDER_HPP #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include namespace boost::mqtt5::detail { namespace asio = boost::asio; class write_req { static constexpr unsigned SERIAL_BITS = sizeof(serial_num_t) * 8; asio::const_buffer _buffer; serial_num_t _serial_num; unsigned _flags; using handler_type = asio::any_completion_handler; handler_type _handler; public: write_req( asio::const_buffer buffer, serial_num_t serial_num, unsigned flags, handler_type handler ) : _buffer(buffer), _serial_num(serial_num), _flags(flags), _handler(std::move(handler)) {} write_req(write_req&&) = default; write_req(const write_req&) = delete; write_req& operator=(write_req&&) = default; write_req& operator=(const write_req&) = delete; static serial_num_t next_serial_num(serial_num_t last) { return last + 1; } asio::const_buffer buffer() const { return _buffer; } void complete(error_code ec) { std::move(_handler)(ec); } void complete_post(const asio::any_io_executor& ex, error_code ec) { asio::post( ex, asio::prepend(std::move(_handler), ec) ); } bool empty() const { return !_handler; } bool throttled() const { return _flags & send_flag::throttled; } bool terminal() const { return _flags & send_flag::terminal; } bool operator<(const write_req& other) const { if (prioritized() != other.prioritized()) return prioritized(); auto s1 = _serial_num; auto s2 = other._serial_num; if (s1 < s2) return (s2 - s1) < (1u << (SERIAL_BITS - 1)); return (s1 - s2) >= (1u << (SERIAL_BITS - 1)); } private: bool prioritized() const { return _flags & send_flag::prioritized; } }; template class async_sender { using self_type = async_sender; using client_service = ClientService; using queue_allocator_type = asio::recycling_allocator; using write_queue_t = std::vector; ClientService& _svc; write_queue_t _write_queue; bool _write_in_progress { false }; static constexpr uint16_t MAX_LIMIT = 65535; uint16_t _limit { MAX_LIMIT }; uint16_t _quota { MAX_LIMIT }; serial_num_t _last_serial_num { 0 }; public: explicit async_sender(ClientService& svc) : _svc(svc) {} async_sender(async_sender&&) = default; async_sender(const async_sender&) = delete; async_sender& operator=(async_sender&&) = default; async_sender& operator=(const async_sender&) = delete; using allocator_type = queue_allocator_type; allocator_type get_allocator() const noexcept { return allocator_type {}; } using executor_type = typename client_service::executor_type; executor_type get_executor() const noexcept { return _svc.get_executor(); } serial_num_t next_serial_num() { return _last_serial_num = write_req::next_serial_num(_last_serial_num); } template decltype(auto) async_send( const BufferType& buffer, serial_num_t serial_num, unsigned flags, CompletionToken&& token ) { using Signature = void (error_code); auto initiation = []( auto handler, self_type& self, const BufferType& buffer, serial_num_t serial_num, unsigned flags ) { self._write_queue.emplace_back( asio::buffer(buffer), serial_num, flags, std::move(handler) ); self.do_write(); }; return asio::async_initiate( initiation, token, std::ref(*this), buffer, serial_num, flags ); } void cancel() { auto ops = std::move(_write_queue); for (auto& op : ops) op.complete_post(_svc.get_executor(), asio::error::operation_aborted); } void resend() { if (_write_in_progress) return; // The _write_in_progress flag is set to true to prevent any write // operations executing before the _write_queue is filled with // all the packets that require resending. _write_in_progress = true; auto new_limit = _svc._stream_context.connack_property(prop::receive_maximum); _limit = new_limit.value_or(MAX_LIMIT); _quota = _limit; auto write_queue = std::move(_write_queue); _svc._replies.resend_unanswered(); for (auto& op : write_queue) op.complete(asio::error::try_again); std::stable_sort(_write_queue.begin(), _write_queue.end()); _write_in_progress = false; do_write(); } void operator()(write_queue_t write_queue, error_code ec, size_t) { _write_in_progress = false; if (ec == asio::error::try_again) { _svc.update_session_state(); _write_queue.insert( _write_queue.begin(), std::make_move_iterator(write_queue.begin()), std::make_move_iterator(write_queue.end()) ); return resend(); } if (ec == asio::error::no_recovery) _svc.cancel(); // errors, if any, are propagated to ops for (auto& op : write_queue) op.complete(ec); if ( ec == asio::error::operation_aborted || ec == asio::error::no_recovery ) return; do_write(); } void throttled_op_done() { if (_limit == MAX_LIMIT) return; ++_quota; do_write(); } private: void do_write() { if (_write_in_progress || _write_queue.empty()) return; _write_in_progress = true; write_queue_t write_queue; auto terminal_req = std::find_if( _write_queue.begin(), _write_queue.end(), [](const auto& op) { return op.terminal(); } ); if (terminal_req != _write_queue.end()) { write_queue.push_back(std::move(*terminal_req)); _write_queue.erase(terminal_req); } else if (_limit == MAX_LIMIT) { write_queue = std::move(_write_queue); } else { for (write_req& req : _write_queue) if (!req.throttled()) write_queue.push_back(std::move(req)); else if (_quota > 0) { --_quota; write_queue.push_back(std::move(req)); } if (write_queue.empty()) { _write_in_progress = false; return; } auto it = std::remove_if( _write_queue.begin(), _write_queue.end(), [](const write_req& req) { return req.empty(); } ); _write_queue.erase(it, _write_queue.end()); } std::vector buffers; buffers.reserve(write_queue.size()); for (const auto& op : write_queue) buffers.push_back(op.buffer()); _svc._replies.clear_fast_replies(); _svc._stream.async_write( buffers, asio::prepend(std::ref(*this), std::move(write_queue)) ); } }; } // end namespace boost::mqtt5::detail #endif // !BOOST_MQTT5_ASYNC_SENDER_HPP