host_state_manager.cpp

#include <iostream>
#include <map>
#include <string>
#include <systemd/sd-bus.h>
#include "host_state_manager.hpp"

namespace phosphor
{
namespace state
{
namespace manager
{

// When you see server:: you know we're referencing our base class
namespace server = sdbusplus::xyz::openbmc_project::State::server;

/* Map a transition to it's systemd target */
const std::map<server::Host::Transition,std::string> SYSTEMD_TARGET_TABLE =
{
        {server::Host::Transition::Off,"obmc-chassis-stop@0.target"},
        {server::Host::Transition::On,"obmc-chassis-start@0.target"}
};

constexpr auto SYSTEMD_SERVICE   = "org.freedesktop.systemd1";
constexpr auto SYSTEMD_OBJ_PATH  = "/org/freedesktop/systemd1";
constexpr auto SYSTEMD_INTERFACE = "org.freedesktop.systemd1.Manager";

constexpr auto SYSTEM_SERVICE   = "org.openbmc.managers.System";
constexpr auto SYSTEM_OBJ_PATH  = "/org/openbmc/managers/System";
constexpr auto SYSTEM_INTERFACE = SYSTEM_SERVICE;

// TODO - Will be rewritten once sdbusplus client bindings are in place
//        and persistent storage design is in place
void Host::determineInitialState()
{
    std::string sysState;

    auto method = this->bus.new_method_call(SYSTEM_SERVICE,
                                            SYSTEM_OBJ_PATH,
                                            SYSTEM_INTERFACE,
                                            "getSystemState");

    auto reply = this->bus.call(method);

    reply.read(sysState);

    if(sysState == "HOST_BOOTED")
    {
        std::cout << "HOST is BOOTED " << sysState << std::endl;
        server::Host::currentHostState(HostState::Running);
    }
    else
    {
        std::cout << "HOST is not BOOTED " << sysState << std::endl;
        server::Host::currentHostState(HostState::Off);
    }

    // Set transition initially to Off
    // TODO - Eventually need to restore this from persistent storage
    server::Host::requestedHostTransition(Transition::Off);

    return;
}

void Host::executeTransition(Transition tranReq)
{
    auto sysdUnit = SYSTEMD_TARGET_TABLE.find(tranReq)->second;

    auto method = this->bus.new_method_call(SYSTEMD_SERVICE,
                                            SYSTEMD_OBJ_PATH,
                                            SYSTEMD_INTERFACE,
                                            "StartUnit");

    method.append(sysdUnit);
    method.append("replace");

    this->bus.call(method);

    return;
}

Host::Transition Host::requestedHostTransition(Transition value)
{
    std::cout << "Someone is setting the RequestedHostTransition field"
              << std::endl;
    executeTransition(value);
    std::cout << "Transition executed with success" << std::endl;

    return server::Host::requestedHostTransition(value);
}

Host::HostState Host::currentHostState(HostState value)
{
    std::cout << "Someone is being bad and trying to set the HostState field"
              << std::endl;

    return server::Host::currentHostState();
}

} // namespace manager
} // namespace state
} // namepsace phosphor