/*
 * Copyright © Canonical Ltd.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 2 or 3 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "mir/report/lttng/tracepoint_provider.h"

#include <boost/throw_exception.hpp>
#include <stdexcept>

#include <dlfcn.h>

namespace
{

std::string const tracepoint_lib_install_path{MIR_TRACEPOINT_LIB_INSTALL_PATH};

void* open_tracepoint_lib(std::string const& lib_name)
{
    auto lib = dlopen(lib_name.c_str(), RTLD_NOW);

    if (lib == nullptr)
    {
        std::string path{tracepoint_lib_install_path + "/" + lib_name};
        lib = dlopen(path.c_str(), RTLD_NOW);
    }

    if (lib == nullptr)
    {
        std::string msg{"Failed to load tracepoint provider: "};
        msg += dlerror();
        BOOST_THROW_EXCEPTION(std::runtime_error(msg));
    }

    return lib;
}

}

mir::report::lttng::TracepointProvider::TracepointProvider(std::string const& lib_name)
    : lib{open_tracepoint_lib(lib_name)}
{
}

mir::report::lttng::TracepointProvider::~TracepointProvider() noexcept
{
    dlclose(lib);
}
