#pragma once #include #include #include #include "occ_events.hpp" #include "config.h" namespace open_power { namespace occ { namespace fs = std::experimental::filesystem; /** @class Error * @brief Monitors for OCC device error condition */ class Error { public: Error() = delete; Error(const Error&) = delete; Error& operator=(const Error&) = delete; Error(Error&&) = default; Error& operator=(Error&&) = default; /** @brief Constructs the Error object * * @param[in] event - reference to sd_event unique_ptr * @param[in] file - File used by driver to communicate errors * @param[in] callBack - Optional function callback on error condition */ Error(EventPtr& event, const fs::path& file, std::function callBack = nullptr) : event(event), file(fs::path(DEV_PATH) / file), callBack(callBack) { // Nothing to do here. } ~Error() { if (fd>= 0) { close(fd); } } /** @brief Starts to monitor for error conditions */ void addWatch(); /** @brief Removes error watch */ void removeWatch(); private: /** @brief sd_event wrapped in unique_ptr */ EventPtr& event; /** @brief event source wrapped in unique_ptr */ EventSourcePtr eventSource; /** Error file */ const fs::path file; /** @brief Optional function to call on error scenario */ std::function callBack; /** @brief File descriptor to watch for errors */ int fd = -1; /** @brief attaches FD to events and sets up callback handler */ void registerCallBack(); /** @brief Opens the file and populates fd */ void openFile(); /** @brief Reads file data * * @return data read. Since its a /sysfs entry, * it would be a string */ std::string readFile(int) const; /** @brief Callback handler when the FD has some activity on it * * @param[in] es - Populated event source * @param[in] fd - Associated File descriptor * @param[in] revents - Type of event * @param[in] userData - User data that was passed during registration * * @return - 0 or positive number on success and negative * errno otherwise */ static int processEvents(sd_event_source* es, int fd, uint32_t revents, void* userData); /** @brief When the error event is received, analyzes it * and makes a callback to error handler if the * content denotes an error condition */ void analyzeEvent(); }; } // namespace occ } // namespace open_power