backend-persistent-file.hpp

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/*
 *  Copyright (c) 2015 Samsung Electronics Co., Ltd All Rights Reserved
 *
 *  Contact: Lukasz Pawelczyk (l.pawelczyk@samsung.com)
 *
 *  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
 *
 *      http://www.apache.org/licenses/LICENSE-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 LOGGER_BACKEND_PERSISTENT_FILE_HPP
#define LOGGER_BACKEND_PERSISTENT_FILE_HPP

#include "logger/backend.hpp"

#include <fcntl.h>
#include <fstream>
#include <ext/stdio_filebuf.h>

namespace logger {

class PersistentFileBackend : public LogBackend {
public:
    PersistentFileBackend(const std::string& filePath) :
        mfilePath(filePath),
        mOut(mfilePath, std::ios::app)
    {
        using filebufType = __gnu_cxx::stdio_filebuf<std::ofstream::char_type>;
        const int fd = static_cast<filebufType*>(mOut.rdbuf())->fd();
        ::fcntl(fd, F_SETFD, ::fcntl(fd, F_GETFD) | FD_CLOEXEC);
    }

    void log(LogLevel logLevel,
             const std::string& file,
             const unsigned int& line,
             const std::string& func,
             const std::string& message) override;
private:
    std::string mfilePath;
    std::ofstream mOut;
};

} // namespace logger

#endif // LOGGER_BACKEND_PERSISTENT_FILE_HPP