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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_UNSUBSCRIBE_OP_HPP #define BOOST_MQTT5_UNSUBSCRIBE_OP_HPP #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include namespace boost::mqtt5::detail { namespace asio = boost::asio; template class unsubscribe_op { using client_service = ClientService; struct on_unsubscribe {}; struct on_unsuback {}; std::shared_ptr _svc_ptr; using handler_type = cancellable_handler< Handler, typename client_service::executor_type >; handler_type _handler; size_t _num_topics { 0 }; public: unsubscribe_op( std::shared_ptr svc_ptr, Handler&& handler ) : _svc_ptr(std::move(svc_ptr)), _handler(std::move(handler), _svc_ptr->get_executor()) { auto slot = asio::get_associated_cancellation_slot(_handler); if (slot.is_connected()) slot.assign([&svc = *_svc_ptr](asio::cancellation_type_t) { svc.cancel(); }); } unsubscribe_op(unsubscribe_op&&) = default; unsubscribe_op(const unsubscribe_op&) = delete; unsubscribe_op& operator=(unsubscribe_op&&) = default; unsubscribe_op& operator=(const unsubscribe_op&) = delete; using allocator_type = asio::associated_allocator_t; allocator_type get_allocator() const noexcept { return asio::get_associated_allocator(_handler); } using executor_type = typename client_service::executor_type; executor_type get_executor() const noexcept { return _svc_ptr->get_executor(); } void perform( const std::vector& topics, const unsubscribe_props& props ) { _num_topics = topics.size(); uint16_t packet_id = _svc_ptr->allocate_pid(); if (packet_id == 0) return complete_immediate(client::error::pid_overrun, packet_id); if (_num_topics == 0) return complete_immediate(client::error::invalid_topic, packet_id); auto ec = validate_unsubscribe(topics, props); if (ec) return complete_immediate(ec, packet_id); auto unsubscribe = control_packet::of( with_pid, get_allocator(), encoders::encode_unsubscribe, packet_id, topics, props ); auto max_packet_size = _svc_ptr->connack_property(prop::maximum_packet_size) .value_or(default_max_send_size); if (unsubscribe.size() > max_packet_size) return complete_immediate(client::error::packet_too_large, packet_id); send_unsubscribe(std::move(unsubscribe)); } void send_unsubscribe(control_packet unsubscribe) { auto wire_data = unsubscribe.wire_data(); _svc_ptr->async_send( wire_data, no_serial, send_flag::none, asio::prepend( std::move(*this), on_unsubscribe {}, std::move(unsubscribe) ) ); } void resend_unsubscribe(control_packet subscribe) { if (_handler.cancelled() != asio::cancellation_type_t::none) return complete( asio::error::operation_aborted, subscribe.packet_id() ); send_unsubscribe(std::move(subscribe)); } void operator()( on_unsubscribe, control_packet packet, error_code ec ) { if (ec == asio::error::try_again) return resend_unsubscribe(std::move(packet)); auto packet_id = packet.packet_id(); if (ec) return complete(ec, packet_id); _svc_ptr->async_wait_reply( control_code_e::unsuback, packet_id, asio::prepend(std::move(*this), on_unsuback {}, std::move(packet)) ); } void operator()( on_unsuback, control_packet packet, error_code ec, byte_citer first, byte_citer last ) { if (ec == asio::error::try_again) // "resend unanswered" return resend_unsubscribe(std::move(packet)); uint16_t packet_id = packet.packet_id(); if (ec) return complete(ec, packet_id); auto unsuback = decoders::decode_unsuback( static_cast(std::distance(first, last)), first ); if (!unsuback.has_value()) { on_malformed_packet("Malformed UNSUBACK: cannot decode"); return resend_unsubscribe(std::move(packet)); } auto& [props, rcs] = *unsuback; auto reason_codes = to_reason_codes(std::move(rcs)); if (reason_codes.size() != _num_topics) { on_malformed_packet( "Malformed UNSUBACK: does not contain a " "valid Reason Code for every Topic Filter" ); return resend_unsubscribe(std::move(packet)); } complete( ec, packet_id, std::move(reason_codes), std::move(props) ); } private: static error_code validate_unsubscribe( const std::vector& topics, const unsubscribe_props& props ) { for (const auto& topic : topics) if (validate_topic_filter(topic) != validation_result::valid) return client::error::invalid_topic; const auto& user_properties = props[prop::user_property]; for (const auto& user_property: user_properties) if (!is_valid_string_pair(user_property)) return client::error::malformed_packet; return error_code {}; } static std::vector to_reason_codes(std::vector codes) { std::vector ret; for (uint8_t code : codes) { auto rc = to_reason_code(code); if (rc) ret.push_back(*rc); } return ret; } void on_malformed_packet( const std::string& reason ) { auto props = disconnect_props {}; props[prop::reason_string] = reason; async_disconnect( disconnect_rc_e::malformed_packet, props, _svc_ptr, asio::detached ); } void complete_immediate(error_code ec, uint16_t packet_id) { if (packet_id != 0) _svc_ptr->free_pid(packet_id); _handler.complete_immediate( ec, std::vector(_num_topics, reason_codes::empty), unsuback_props {} ); } void complete( error_code ec, uint16_t packet_id, std::vector reason_codes = {}, unsuback_props props = {} ) { if (reason_codes.empty() && _num_topics) reason_codes = std::vector(_num_topics, reason_codes::empty); _svc_ptr->free_pid(packet_id); _handler.complete(ec, std::move(reason_codes), std::move(props)); } }; template class initiate_async_unsubscribe { std::shared_ptr _svc_ptr; public: explicit initiate_async_unsubscribe(std::shared_ptr svc_ptr) : _svc_ptr(std::move(svc_ptr)) {} using executor_type = typename ClientService::executor_type; executor_type get_executor() const noexcept { return _svc_ptr->get_executor(); } template void operator()( Handler&& handler, const std::vector& topics, const unsubscribe_props& props ) { detail::unsubscribe_op { _svc_ptr, std::move(handler) } .perform(topics, props); } }; } // end namespace boost::mqtt5::detail #endif // !BOOST_MQTT5_UNSUBSCRIBE_OP_HPP