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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_LOGGER_HPP #define BOOST_MQTT5_LOGGER_HPP #include #include #include #include #include #include #include #include #include #include #include namespace boost::mqtt5 { namespace asio = boost::asio; using error_code = boost::system::error_code; /** * \brief Represents the severity level of log messages. */ enum class log_level : uint8_t { /** Error messages that indicate serious issues. **/ error = 1, /** Warnings that indicate potential problems or non-critical issues. **/ warning, /** Informational messages that highlight normal application behaviour and events. **/ info, /** Detailed messages useful for diagnosing issues. **/ debug }; /** * \brief A logger class that can used by the \ref mqtt_client to output * the results of operations to stderr. * * \details All functions are invoked directly within the \ref mqtt_client using * its default executor. If the \ref mqtt_client is initialized with an explicit or * implicit strand, none of the functions will be invoked concurrently. * * \par Thread safety * Distinct objects: safe. \n * Shared objects: unsafe. \n * This class is not thread-safe. */ class logger { constexpr static auto prefix = "[Boost.MQTT5]"; log_level _level; public: /** * \brief Constructs a logger that filters log messages based on the specified log level. * * \param level Messages with a log level higher than the given log level will be suppressed. */ logger(log_level level = log_level::info) : _level(level) {} /** * \brief Outputs the results of the resolve operation. * * \param ec Error code returned by the resolve operation. * \param host Hostname used in the resolve operation. * \param port Port used in the resolve operation. * \param eps Endpoints returned by the resolve operation. */ void at_resolve( error_code ec, std::string_view host, std::string_view port, const asio::ip::tcp::resolver::results_type& eps ) { if (!ec && _level < log_level::info) return; output_prefix(); std::clog << "resolve: " << host << ":" << port; std::clog << " - " << ec.message() << "."; if (_level == log_level::debug) { std::clog << " ["; for (auto it = eps.begin(); it != eps.end();) { std::clog << it->endpoint().address().to_string(); if (++it != eps.end()) std::clog << ","; } std::clog << "]"; } std::clog << std::endl; } /** * \brief Outputs the results of the TCP connect operation. * * \param ec Error code returned by the TCP connect operation. * \param ep The TCP endpoint used to establish the TCP connection. */ void at_tcp_connect(error_code ec, asio::ip::tcp::endpoint ep) { if (!ec && _level < log_level::info) return; output_prefix(); std::clog << "TCP connect: " << ep.address().to_string() << ":" << ep.port() << " - " << ec.message() << "." << std::endl; } /** * \brief Outputs the results of the TLS handshake operation. * * \param ec Error code returned by the TLS handshake operation. * \param ep The TCP endpoint used to establish the TLS handshake. */ void at_tls_handshake(error_code ec, asio::ip::tcp::endpoint ep) { if (!ec && _level < log_level::info) return; output_prefix(); std::clog << "TLS handshake: " << ep.address().to_string() << ":" << ep.port() << " - " << ec.message() << "." << std::endl; } /** * \brief Outputs the results of the WebSocket handshake operation. * * \param ec Error code returned by the WebSocket handshake operation. * \param ep The TCP endpoint used to establish the WebSocket handshake. */ void at_ws_handshake(error_code ec, asio::ip::tcp::endpoint ep) { if (!ec && _level < log_level::info) return; output_prefix(); std::clog << "WebSocket handshake: " << ep.address().to_string() << ":" << ep.port() << " - " << ec.message() << "." << std::endl; } /** * \brief Outputs the contents of the \__CONNACK\__ packet sent by the Broker. * * \param rc Reason Code in the received \__CONNACK\__ packet indicating * the result of the MQTT handshake. * \param session_present A flag indicating whether the Broker already has a session associated * with this connection. * \param ca_props \__CONNACK_PROPS\__ received in the \__CONNACK\__ packet. */ void at_connack( reason_code rc, bool session_present, const connack_props& ca_props ) { if (!rc && _level < log_level::info) return; output_prefix(); std::clog << "connack: " << rc.message() << "."; if (_level == log_level::debug) { std::clog << " session_present:" << session_present << " "; output_props(ca_props); } std::clog << std::endl; } /** * \brief Outputs the contents of the \__DISCONNECT\__ packet sent by the Broker. * * \param rc Reason Code in the received \__DISCONNECT\__ packet indicating * the reason behind the disconnection. * \param dc_props \__DISCONNECT_PROPS\__ received in the \__DISCONNECT\__ packet. */ void at_disconnect(reason_code rc, const disconnect_props& dc_props) { output_prefix(); std::clog << "disconnect: " << rc.message() << "."; if (_level == log_level::debug) output_props(dc_props); std::clog << std::endl; } /** * \brief Outputs the error message when it occurs at the transport layer * read or write operations. * * \param ec The error code returned by the `async_read_some` or * `async_write_some` operation on the underlying \__StreamType\__ stream. */ void at_transport_error(error_code ec) { if (_level < log_level::info) return; output_prefix(); std::clog << "transport layer error: " << ec.message() << "." << std::endl; } private: void output_prefix() { std::clog << prefix << " "; } template void output_props(const Props& props) { props.visit( [](const auto& prop, const auto& val) -> bool { if constexpr (detail::is_optional) { if (val.has_value()) { std::clog << property_name(prop) << ":"; using value_type = boost::remove_cv_ref_t; if constexpr (std::is_same_v) std::clog << std::to_string(*val) << " "; else std::clog << *val << " "; } } else { // is vector if (val.empty()) return true; std::clog << property_name(prop) << ":"; std::clog << "["; for (size_t i = 0; i < val.size(); i++) { if constexpr (detail::is_pair) std::clog << "(" << val[i].first << "," << val[i].second << ")"; else std::clog << std::to_string(val[i]); if (i + 1 < val.size()) std::clog << ", "; } std::clog << "] "; } return true; } ); } template static std::string_view property_name(std::integral_constant) { return prop::name_v

; } }; // Verify that the logger class satisfies the LoggerType concept static_assert(has_at_resolve); static_assert(has_at_tcp_connect); static_assert(has_at_tls_handshake); static_assert(has_at_ws_handshake); static_assert(has_at_connack); static_assert(has_at_disconnect); static_assert(has_at_transport_error); } // end namespace boost::mqtt5 #endif // !BOOST_MQTT5_LOGGER_HPP