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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_SUBSCRIBE_OP_HPP #define BOOST_MQTT5_SUBSCRIBE_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 subscribe_op { using client_service = ClientService; struct on_subscribe {}; struct on_suback {}; 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: subscribe_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(); }); } subscribe_op(subscribe_op&&) = default; subscribe_op(const subscribe_op&) = delete; subscribe_op& operator=(subscribe_op&&) = default; subscribe_op& operator=(const subscribe_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 subscribe_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_subscribe(topics, props); if (ec) return complete_immediate(ec, packet_id); auto subscribe = control_packet::of( with_pid, get_allocator(), encoders::encode_subscribe, packet_id, topics, props ); auto max_packet_size = _svc_ptr->connack_property(prop::maximum_packet_size) .value_or(default_max_send_size); if (subscribe.size() > max_packet_size) return complete_immediate(client::error::packet_too_large, packet_id); send_subscribe(std::move(subscribe)); } void send_subscribe(control_packet subscribe) { auto wire_data = subscribe.wire_data(); _svc_ptr->async_send( wire_data, no_serial, send_flag::none, asio::prepend( std::move(*this), on_subscribe {}, std::move(subscribe) ) ); } void resend_subscribe(control_packet subscribe) { if (_handler.cancelled() != asio::cancellation_type_t::none) return complete( asio::error::operation_aborted, subscribe.packet_id() ); send_subscribe(std::move(subscribe)); } void operator()( on_subscribe, control_packet packet, error_code ec ) { if (ec == asio::error::try_again) return resend_subscribe(std::move(packet)); auto packet_id = packet.packet_id(); if (ec) return complete(ec, packet_id); _svc_ptr->async_wait_reply( control_code_e::suback, packet_id, asio::prepend(std::move(*this), on_suback {}, std::move(packet)) ); } void operator()( on_suback, control_packet packet, error_code ec, byte_citer first, byte_citer last ) { if (ec == asio::error::try_again) // "resend unanswered" return resend_subscribe(std::move(packet)); uint16_t packet_id = packet.packet_id(); if (ec) return complete(ec, packet_id); auto suback = decoders::decode_suback( static_cast(std::distance(first, last)), first ); if (!suback.has_value()) { on_malformed_packet("Malformed SUBACK: cannot decode"); return resend_subscribe(std::move(packet)); } auto& [props, rcs] = *suback; auto reason_codes = to_reason_codes(std::move(rcs)); if (reason_codes.size() != _num_topics) { on_malformed_packet( "Malformed SUBACK: does not contain a " "valid Reason Code for every Topic Filter" ); return resend_subscribe(std::move(packet)); } complete( ec, packet_id, std::move(reason_codes), std::move(props) ); } private: error_code validate_subscribe( const std::vector& topics, const subscribe_props& props ) const { error_code ec; for (const auto& topic: topics) { ec = validate_topic(topic); if (ec) return ec; } ec = validate_props(props); return ec; } error_code validate_topic(const subscribe_topic& topic) const { auto wildcard_available = _svc_ptr->connack_property( prop::wildcard_subscription_available ).value_or(1); auto shared_available = _svc_ptr->connack_property( prop::shared_subscription_available ).value_or(1); std::string_view topic_filter = topic.topic_filter; validation_result result = validation_result::valid; if ( topic_filter.compare(0, shared_sub_prefix.size(), shared_sub_prefix) == 0 ) { if (!shared_available) return client::error::shared_subscription_not_available; result = validate_shared_topic_filter(topic_filter, wildcard_available); } else result = wildcard_available ? validate_topic_filter(topic_filter) : validate_topic_name(topic_filter); if (result == validation_result::invalid) return client::error::invalid_topic; if (!wildcard_available && result != validation_result::valid) return client::error::wildcard_subscription_not_available; return error_code {}; } error_code validate_props(const subscribe_props& props) const { 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; const auto& sub_id = props[prop::subscription_identifier]; if (!sub_id.has_value()) return error_code {}; auto sub_id_available = _svc_ptr->connack_property( prop::subscription_identifier_available ).value_or(1); if (!sub_id_available) return client::error::subscription_identifier_not_available; return (min_subscription_identifier <= *sub_id && *sub_id <= max_subscription_identifier) ? error_code {} : client::error::malformed_packet; } 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), suback_props {} ); } void complete( error_code ec, uint16_t packet_id, std::vector reason_codes = {}, suback_props props = {} ) { if (reason_codes.empty() && _num_topics) reason_codes = std::vector(_num_topics, reason_codes::empty); if (!_svc_ptr->subscriptions_present()) { bool has_success_rc = std::any_of( reason_codes.cbegin(), reason_codes.cend(), [](const reason_code& rc) { return !rc; } ); if (has_success_rc) _svc_ptr->subscriptions_present(true); } _svc_ptr->free_pid(packet_id); _handler.complete(ec, std::move(reason_codes), std::move(props)); } }; template class initiate_async_subscribe { std::shared_ptr _svc_ptr; public: explicit initiate_async_subscribe(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 subscribe_props& props ) { detail::subscribe_op { _svc_ptr, std::move(handler) } .perform(topics, props); } }; } // end namespace boost::mqtt5::detail #endif // !BOOST_MQTT5_SUBSCRIBE_OP_HPP