utils.hpp

#pragma once

#include "types.hpp"

#include <fstream>
#include <phosphor-logging/log.hpp>
#include <sdbusplus/bus.hpp>

namespace phosphor
{
namespace time
{
namespace utils
{

using namespace phosphor::logging;

/** @brief Read data with type T from file
 *
 * @param[in] fileName - The name of file to read from
 *
 * @return The data with type T
 */
template <typename T>
T readData(const char* fileName)
{
    T data{};
    std::ifstream fs(fileName);
    if (fs.is_open())
    {
        fs >> data;
    }
    return data;
}

/** @brief Write data with type T to file
 *
 * @param[in] fileName - The name of file to write to
 * @param[in] data - The data with type T to write to file
 */
template <typename T>
void writeData(const char* fileName, T&& data)
{
    std::ofstream fs(fileName, std::ios::out);
    if (fs.is_open())
    {
        fs << std::forward<T>(data);
    }
}

/** @brief The template function to get property from the requested dbus path
 *
 * @param[in] bus          - The Dbus bus object
 * @param[in] service      - The Dbus service name
 * @param[in] path         - The Dbus object path
 * @param[in] interface    - The Dbus interface
 * @param[in] propertyName - The property name to get
 *
 * @return The value of the property
 */
template <typename T>
T getProperty(sdbusplus::bus::bus& bus, const char* service, const char* path,
              const char* interface, const char* propertyName)
{
    auto method = bus.new_method_call(service, path,
                                      "org.freedesktop.DBus.Properties", "Get");
    method.append(interface, propertyName);
    try
    {
        std::variant<T> value{};
        auto reply = bus.call(method);
        reply.read(value);
        return std::get<T>(value);
    }
    catch (const sdbusplus::exception::SdBusError& ex)
    {
        log<level::ERR>("GetProperty call failed", entry("PATH=%s", path),
                        entry("INTERFACE=%s", interface),
                        entry("PROPERTY=%s", propertyName));
        throw std::runtime_error("GetProperty call failed");
    }
}

/** @brief Get service name from object path and interface
 *
 * @param[in] bus          - The Dbus bus object
 * @param[in] path         - The Dbus object path
 * @param[in] interface    - The Dbus interface
 *
 * @return The name of the service
 */
std::string getService(sdbusplus::bus::bus& bus, const char* path,
                       const char* interface);

/** @brief Convert a string to enum Mode
 *
 * Convert the time mode string to enum.
 * Valid strings are
 *   "xyz.openbmc_project.Time.Synchronization.Method.NTP"
 *   "xyz.openbmc_project.Time.Synchronization.Method.Manual"
 * If it's not a valid time mode string, it means something
 * goes wrong so raise exception.
 *
 * @param[in] mode - The string of time mode
 *
 * @return The Mode enum
 */
Mode strToMode(const std::string& mode);

/** @brief Convert a mode enum to mode string
 *
 * @param[in] mode - The Mode enum
 *
 * @return The string of the mode
 */
std::string modeToStr(Mode mode);

} // namespace utils
} // namespace time
} // namespace phosphor