LoadConfig.h

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/*
 * Copyright 2006-2009 Savarese Software Research Corporation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.savarese.com/software/ApacheLicense-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef __SSRC_WSPR_LUA_LOAD_CONFIG_H
#define __SSRC_WSPR_LUA_LOAD_CONFIG_H

#include <boost/filesystem/path.hpp>

#include <ssrc/wispers/utility/DynamicLibrary.h>
#include <ssrc/wispers/lua/Properties.h>

__BEGIN_NS_SSRC_WSPR_LUA

extern "C" typedef properties_ptr fun_type(const std::string &);
extern "C" typedef fun_type* fun_ptr;

class LoadConfig {
  NS_SSRC_WSPR_UTILITY::DynamicLibrary _lib;
  const fun_ptr _load;
  const fun_ptr _load_str;

public:

  LoadConfig(const boost::filesystem::path & module_dir)
    SSRC_DECL_THROW(NS_SSRC_WSPR_UTILITY::LoadError) :
    _lib((module_dir / "wspr.dso.load_config.so").string()),
    _load(_lib.symbol<fun_ptr>("ssrc_wispers_load_config")),
    _load_str(_lib.symbol<fun_ptr>("ssrc_wispers_load_string_config"))
  { }

  inline properties_ptr operator()(const std::string & filename) const
    SSRC_DECL_THROW(LuaCallError)
  {
    try {
      return _load(filename);
    } catch(const LuaCallError & lce) {
      // Re-throw a copy to avoid possible segfault if library is unloaded
      // before next catch..
      throw LuaCallError(lce);
    }
  }

  inline properties_ptr load_from_string(const std::string & code_str) const
    SSRC_DECL_THROW(LuaCallError)
  {
    try {
      return _load_str(code_str);
    } catch(const LuaCallError & lce) {
      // Re-throw a copy to avoid possible segfault if library is unloaded
      // before next catch..
      throw LuaCallError(lce);
    }
  }
};

__END_NS_SSRC_WSPR_LUA

#endif