ext_interface.cpp

#include <ext_interface.hpp>
#include <phosphor-logging/log.hpp>
#include <sdbusplus/server.hpp>

#include <string>

// Mapper
constexpr auto MAPPER_BUSNAME = "xyz.openbmc_project.ObjectMapper";
constexpr auto MAPPER_PATH = "/xyz/openbmc_project/object_mapper";
constexpr auto MAPPER_INTERFACE = "xyz.openbmc_project.ObjectMapper";

// Reboot count
constexpr auto REBOOTCOUNTER_PATH("/xyz/openbmc_project/state/host0");
constexpr auto REBOOTCOUNTER_INTERFACE(
    "xyz.openbmc_project.Control.Boot.RebootAttempts");

using namespace phosphor::logging;

/**
 * @brief Get DBUS service for input interface via mapper call
 *
 * This is an internal function to be used only by functions within this
 * file.
 *
 * @param[in] bus -  DBUS Bus Object
 * @param[in] intf - DBUS Interface
 * @param[in] path - DBUS Object Path
 *
 * @return distinct dbus name for input interface/path
 **/
std::string getService(sdbusplus::bus_t& bus, const std::string& intf,
                       const std::string& path)
{
    auto mapper = bus.new_method_call(MAPPER_BUSNAME, MAPPER_PATH,
                                      MAPPER_INTERFACE, "GetObject");

    mapper.append(path);
    mapper.append(std::vector<std::string>({intf}));

    auto mapperResponseMsg = bus.call(mapper);

    auto mapperResponse =
        mapperResponseMsg
            .unpack<std::map<std::string, std::vector<std::string>>>();

    if (mapperResponse.empty())
    {
        // TODO openbmc/openbmc#1712 - Handle empty mapper resp. consistently
        throw std::runtime_error("ERROR in reading the mapper response");
    }

    return mapperResponse.begin()->first;
}

uint32_t getBootCount()
{
    auto bus = sdbusplus::bus::new_default();

    auto rebootSvc =
        getService(bus, REBOOTCOUNTER_INTERFACE, REBOOTCOUNTER_PATH);

    auto method = bus.new_method_call(rebootSvc.c_str(), REBOOTCOUNTER_PATH,
                                      "org.freedesktop.DBus.Properties", "Get");

    method.append(REBOOTCOUNTER_INTERFACE, "AttemptsLeft");
    auto reply = bus.call(method);

    auto rebootCount = reply.unpack<std::variant<uint32_t>>();

    return std::get<uint32_t>(rebootCount);
}