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/*
* Copyright (C) 2020 Codership Oy <info@codership.com>
*
* This file is part of wsrep-lib.
*
* Wsrep-lib is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* Wsrep-lib 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with wsrep-lib. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef WSREP_SERVICE_HELPERS_HPP
#define WSREP_SERVICE_HELPERS_HPP
#include "wsrep/logger.hpp"
#include <dlfcn.h>
#include <cerrno>
namespace wsrep_impl
{
template <typename InitFn>
int service_probe(void* dlh, const char* symbol, const char* service_name)
{
union {
InitFn dlfun;
void* obj;
} alias;
// Clear previous errors
(void)dlerror();
alias.obj = dlsym(dlh, symbol);
if (alias.obj)
{
return 0;
}
else
{
wsrep::log_warning() << "Support for " << service_name
<< " " << symbol
<< " not found from provider: "
<< dlerror();
return ENOTSUP;
}
}
template <typename InitFn, typename ServiceCallbacks>
int service_init(void* dlh,
const char* symbol,
ServiceCallbacks service_callbacks,
const char* service_name)
{
union {
InitFn dlfun;
void* obj;
} alias;
// Clear previous errors
(void)dlerror();
alias.obj = dlsym(dlh, symbol);
if (alias.obj)
{
wsrep::log_info() << "Initializing " << service_name;
return (*alias.dlfun)(service_callbacks);
}
else
{
wsrep::log_info()
<< "Provider does not support " << service_name;
return ENOTSUP;
}
}
template <typename DeinitFn>
void service_deinit(void* dlh, const char* symbol, const char* service_name)
{
union {
DeinitFn dlfun;
void* obj;
} alias;
// Clear previous errors
(void)dlerror();
alias.obj = dlsym(dlh, symbol);
if (alias.obj)
{
wsrep::log_info() << "Deinitializing " << service_name;
(*alias.dlfun)();
}
else
{
wsrep::log_info()
<< "Provider does not support deinitializing of "
<< service_name;
}
}
}
#endif // WSREP_SERVICE_HELPERS_HPP
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