mslverify/util.hpp

#pragma once

#include <phosphor-logging/elog-errors.hpp>
#include <phosphor-logging/elog.hpp>
#include <phosphor-logging/log.hpp>
#include <sdbusplus/bus.hpp>
#include <sdbusplus/message.hpp>
#include <xyz/openbmc_project/Common/error.hpp>

#include <string>

namespace util
{
namespace detail
{
namespace errors = sdbusplus::xyz::openbmc_project::Common::Error;
} // namespace detail

/** @brief Alias for PropertiesChanged signal callbacks. */
template <typename... T>
using Properties = std::map<std::string, std::variant<T...>>;

namespace sdbusplus
{

/** @brief Get the bus connection. */
static auto& getBus() __attribute__((pure));
static auto& getBus()
{
    static auto bus = ::sdbusplus::bus::new_default();
    return bus;
}

/** @brief Invoke a method. */
template <typename... Args>
static auto callMethod(::sdbusplus::bus::bus& bus, const std::string& busName,
                       const std::string& path, const std::string& interface,
                       const std::string& method, Args&&... args)
{
    auto reqMsg = bus.new_method_call(busName.c_str(), path.c_str(),
                                      interface.c_str(), method.c_str());
    reqMsg.append(std::forward<Args>(args)...);
    auto respMsg = bus.call(reqMsg);

    if (respMsg.is_method_error())
    {
        phosphor::logging::log<phosphor::logging::level::INFO>(
            "Failed to invoke DBus method.",
            phosphor::logging::entry("PATH=%s", path.c_str()),
            phosphor::logging::entry("INTERFACE=%s", interface.c_str()),
            phosphor::logging::entry("METHOD=%s", method.c_str()));
        phosphor::logging::elog<detail::errors::InternalFailure>();
    }

    return respMsg;
}

/** @brief Invoke a method. */
template <typename... Args>
static auto callMethod(const std::string& busName, const std::string& path,
                       const std::string& interface, const std::string& method,
                       Args&&... args)
{
    return callMethod(getBus(), busName, path, interface, method,
                      std::forward<Args>(args)...);
}

/** @brief Invoke a method and read the response. */
template <typename Ret, typename... Args>
static auto
    callMethodAndRead(::sdbusplus::bus::bus& bus, const std::string& busName,
                      const std::string& path, const std::string& interface,
                      const std::string& method, Args&&... args)
{
    ::sdbusplus::message::message respMsg = callMethod<Args...>(
        bus, busName, path, interface, method, std::forward<Args>(args)...);
    Ret resp;
    respMsg.read(resp);
    return resp;
}

/** @brief Invoke a method and read the response. */
template <typename Ret, typename... Args>
static auto callMethodAndRead(const std::string& busName,
                              const std::string& path,
                              const std::string& interface,
                              const std::string& method, Args&&... args)
{
    return callMethodAndRead<Ret>(getBus(), busName, path, interface, method,
                                  std::forward<Args>(args)...);
}

/** @brief Get service from the mapper. */
static auto getService(::sdbusplus::bus::bus& bus, const std::string& path,
                       const std::string& interface)
{
    using namespace std::literals::string_literals;
    using GetObject = std::map<std::string, std::vector<std::string>>;

    auto mapperResp = callMethodAndRead<GetObject>(
        bus, "xyz.openbmc_project.ObjectMapper"s,
        "/xyz/openbmc_project/object_mapper"s,
        "xyz.openbmc_project.ObjectMapper"s, "GetObject"s, path,
        GetObject::mapped_type{interface});

    if (mapperResp.empty())
    {
        phosphor::logging::log<phosphor::logging::level::INFO>(
            "Object not found.",
            phosphor::logging::entry("PATH=%s", path.c_str()),
            phosphor::logging::entry("INTERFACE=%s", interface.c_str()));
        phosphor::logging::elog<detail::errors::InternalFailure>();
    }
    return mapperResp.begin()->first;
}

/** @brief Get a property without mapper lookup. */
template <typename Property>
static auto getProperty(::sdbusplus::bus::bus& bus, const std::string& busName,
                        const std::string& path, const std::string& interface,
                        const std::string& property)
{
    using namespace std::literals::string_literals;

    auto msg =
        callMethod(bus, busName, path, "org.freedesktop.DBus.Properties"s,
                   "Get"s, interface, property);
    ::std::variant<Property> value;
    msg.read(value);
    return std::get<Property>(value);
}

/** @brief Get a property without mapper lookup. */
template <typename Property>
static auto getProperty(const std::string& busName, const std::string& path,
                        const std::string& interface,
                        const std::string& property)
{
    return getProperty<Property>(getBus(), busName, path, interface, property);
}

/** @brief Get a property with mapper lookup. */
template <typename Property>
static auto getProperty(::sdbusplus::bus::bus& bus, const std::string& path,
                        const std::string& interface,
                        const std::string& property)
{
    return getProperty<Property>(bus, getService(bus, path, interface), path,
                                 interface, property);
}

/** @brief Get a property with mapper lookup. */
template <typename Property>
static auto getProperty(const std::string& path, const std::string& interface,
                        const std::string& property)
{
    return getProperty<Property>(getBus(), path, interface, property);
}

} // namespace sdbusplus
} // namespace util