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#pragma once
#include <unistd.h>
#include <functional>
#include <experimental/filesystem>
#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<void(bool)> 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;
/** @brief Current state of error watching */
bool watching = false;
/** @brief attaches FD to events and sets up callback handler */
void registerCallBack();
/** @brief Opens the file and populates fd */
void openFile();
/** @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
*/
virtual void analyzeEvent();
protected:
/** @brief File descriptor to watch for errors */
int fd = -1;
/** Error file */
const fs::path file;
/** @brief Optional function to call on error scenario */
std::function<void(bool)> callBack;
/** @brief Reads file data
*
* @return data read. Since its a /sysfs entry,
* it would be a string
*/
std::string readFile(int) const;
};
} // namespace occ
} // namespace open_power
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