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utility.hpp
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utility.hpp
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#pragma once
#include <phosphor-logging/elog.hpp>
#include <phosphor-logging/log.hpp>
#include <sdbusplus/bus.hpp>
#include <string>
namespace witherspoon
{
namespace power
{
namespace util
{
constexpr auto SYSTEMD_SERVICE = "org.freedesktop.systemd1";
constexpr auto SYSTEMD_ROOT = "/org/freedesktop/systemd1";
constexpr auto SYSTEMD_INTERFACE = "org.freedesktop.systemd1.Manager";
constexpr auto POWEROFF_TARGET = "[email protected]";
constexpr auto PROPERTY_INTF = "org.freedesktop.DBus.Properties";
/**
* @brief Get the service name from the mapper for the
* interface and path passed in.
*
* @param[in] path - the D-Bus path name
* @param[in] interface - the D-Bus interface name
* @param[in] bus - the D-Bus object
*
* @return The service name
*/
std::string getService(const std::string& path, const std::string& interface,
sdbusplus::bus_t& bus);
/**
* @brief Read a D-Bus property
*
* @param[in] interface - the interface the property is on
* @param[in] propertName - the name of the property
* @param[in] path - the D-Bus path
* @param[in] service - the D-Bus service
* @param[in] bus - the D-Bus object
* @param[out] value - filled in with the property value
*/
template <typename T>
void getProperty(const std::string& interface, const std::string& propertyName,
const std::string& path, const std::string& service,
sdbusplus::bus_t& bus, T& value)
{
std::variant<T> property;
auto method = bus.new_method_call(service.c_str(), path.c_str(),
PROPERTY_INTF, "Get");
method.append(interface, propertyName);
auto reply = bus.call(method);
reply.read(property);
value = std::get<T>(property);
}
/**
* @brief Write a D-Bus property
*
* @param[in] interface - the interface the property is on
* @param[in] propertName - the name of the property
* @param[in] path - the D-Bus path
* @param[in] service - the D-Bus service
* @param[in] bus - the D-Bus object
* @param[in] value - the value to set the property to
*/
template <typename T>
void setProperty(const std::string& interface, const std::string& propertyName,
const std::string& path, const std::string& service,
sdbusplus::bus_t& bus, T& value)
{
std::variant<T> propertyValue(value);
auto method = bus.new_method_call(service.c_str(), path.c_str(),
PROPERTY_INTF, "Set");
method.append(interface, propertyName, propertyValue);
auto reply = bus.call(method);
}
/**
* Logs an error and powers off the system.
*
* @tparam T - error that will be logged before the power off
* @param[in] bus - D-Bus object
*/
template <typename T>
void powerOff(sdbusplus::bus_t& bus)
{
phosphor::logging::report<T>();
auto method = bus.new_method_call(SYSTEMD_SERVICE, SYSTEMD_ROOT,
SYSTEMD_INTERFACE, "StartUnit");
method.append(POWEROFF_TARGET);
method.append("replace");
bus.call_noreply(method);
}
} // namespace util
} // namespace power
} // namespace witherspoon