src/button_handler.cpp

#include "button_handler.hpp"

#include <phosphor-logging/log.hpp>
#include <xyz/openbmc_project/State/Chassis/server.hpp>
#include <xyz/openbmc_project/State/Host/server.hpp>

namespace phosphor
{
namespace button
{

namespace sdbusRule = sdbusplus::bus::match::rules;
using namespace sdbusplus::xyz::openbmc_project::State::server;
using namespace phosphor::logging;
using sdbusplus::exception::SdBusError;

constexpr auto propertyIface = "org.freedesktop.DBus.Properties";
constexpr auto chassisIface = "xyz.openbmc_project.State.Chassis";
constexpr auto hostIface = "xyz.openbmc_project.State.Host";
constexpr auto powerButtonIface = "xyz.openbmc_project.Chassis.Buttons.Power";
constexpr auto mapperIface = "xyz.openbmc_project.ObjectMapper";

constexpr auto mapperObjPath = "/xyz/openbmc_project/object_mapper";
constexpr auto mapperService = "xyz.openbmc_project.ObjectMapper";

Handler::Handler(sdbusplus::bus::bus& bus) : bus(bus)
{
    try
    {
        if (!getService(POWER_DBUS_OBJECT_NAME, powerButtonIface).empty())
        {
            log<level::INFO>("Starting power button handler");
            powerButtonReleased = std::make_unique<sdbusplus::bus::match_t>(
                bus,
                sdbusRule::type::signal() + sdbusRule::member("Released") +
                    sdbusRule::path(POWER_DBUS_OBJECT_NAME) +
                    sdbusRule::interface(powerButtonIface),
                std::bind(std::mem_fn(&Handler::powerPressed), this,
                          std::placeholders::_1));

            powerButtonLongPressReleased =
                std::make_unique<sdbusplus::bus::match_t>(
                    bus,
                    sdbusRule::type::signal() +
                        sdbusRule::member("PressedLong") +
                        sdbusRule::path(POWER_DBUS_OBJECT_NAME) +
                        sdbusRule::interface(powerButtonIface),
                    std::bind(std::mem_fn(&Handler::longPowerPressed), this,
                              std::placeholders::_1));
        }
    }
    catch (SdBusError& e)
    {
        // The button wasn't implemented
    }
}

std::string Handler::getService(const std::string& path,
                                const std::string& interface) const
{
    auto method = bus.new_method_call(mapperService, mapperObjPath, mapperIface,
                                      "GetObject");
    method.append(path, std::vector{interface});
    auto result = bus.call(method);

    std::map<std::string, std::vector<std::string>> objectData;
    result.read(objectData);

    return objectData.begin()->first;
}

bool Handler::poweredOn() const
{
    auto service = getService(CHASSIS_STATE_OBJECT_NAME, chassisIface);
    auto method = bus.new_method_call(
        service.c_str(), CHASSIS_STATE_OBJECT_NAME, propertyIface, "Get");
    method.append(chassisIface, "CurrentPowerState");
    auto result = bus.call(method);

    sdbusplus::message::variant<std::string> state;
    result.read(state);

    return Chassis::PowerState::On ==
           Chassis::convertPowerStateFromString(
               sdbusplus::message::variant_ns::get<std::string>(state));
}

void Handler::powerPressed(sdbusplus::message::message& msg)
{
    auto transition = Host::Transition::On;

    try
    {
        if (poweredOn())
        {
            transition = Host::Transition::Off;
        }

        log<level::INFO>("Handling power button press");

        sdbusplus::message::variant<std::string> state =
            convertForMessage(transition);

        auto service = getService(HOST_STATE_OBJECT_NAME, hostIface);
        auto method = bus.new_method_call(
            service.c_str(), HOST_STATE_OBJECT_NAME, propertyIface, "Set");
        method.append(hostIface, "RequestedHostTransition", state);

        bus.call(method);
    }
    catch (SdBusError& e)
    {
        log<level::ERR>("Failed power state change on a power button press",
                        entry("ERROR=%s", e.what()));
    }
}

void Handler::longPowerPressed(sdbusplus::message::message& msg)
{
    try
    {
        if (!poweredOn())
        {
            log<level::INFO>(
                "Power is off so ignoring long power button press");
            return;
        }

        log<level::INFO>("Handling long power button press");

        sdbusplus::message::variant<std::string> state =
            convertForMessage(Chassis::Transition::Off);

        auto service = getService(CHASSIS_STATE_OBJECT_NAME, chassisIface);
        auto method = bus.new_method_call(
            service.c_str(), CHASSIS_STATE_OBJECT_NAME, propertyIface, "Set");
        method.append(chassisIface, "RequestedPowerTransition", state);

        bus.call(method);
    }
    catch (SdBusError& e)
    {
        log<level::ERR>("Failed powering off on long power button press",
                        entry("ERROR=%s", e.what()));
    }
}
} // namespace button
} // namespace phosphor