RemoteResource.h

// -*- mode: c++; c-basic-offset:4 -*-
 
// This file is part of the BES http package, part of the Hyrax data server.
 
// Copyright (c) 2020 OPeNDAP, Inc.
// Author: Nathan Potter <ndp@opendap.org>
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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 library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//
// You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112.
 
// Authors:
//      ndp       Nathan Potter <ndp@opendap.org>
 
#ifndef  _bes_http_REMOTE_HTTP_RESOURCE_H_
#define  _bes_http_REMOTE_HTTP_RESOURCE_H_ 1
 
#include <memory>
#include <string>
#include <vector>
#include <mutex>
 
#include "CurlUtils.h"
 
namespace http {
 
class url;

class RemoteResource {
private:
    friend class RemoteResourceTest;
 
    static std::string d_temp_file_dir;

    static void set_temp_file_dir();
    static std::mutex d_temp_file_dir_mutex;

    std::shared_ptr<http::url> d_url;

    int d_fd = 0;

    bool d_initialized = false;

    std::string d_uid;

    std::string d_type;

    std::string d_filename;

    std::string d_basename;

    bool d_delete_file = true;

    std::vector<std::string> d_response_headers; // Response headers

    void get_url(int fd);

    static std::mutex d_mkstemp_mutex;
 
    void set_filename_for_file_url();
 
    void set_delete_temp_file();
 
public:
    RemoteResource() = default;
    RemoteResource(const RemoteResource &rhs) = delete;
    RemoteResource &operator=(const RemoteResource &rhs) = delete;
    explicit RemoteResource(std::shared_ptr<http::url> target_url, std::string uid = "");
 
    virtual ~RemoteResource();
 
    void retrieve_resource();

    std::string get_type() const { return d_type; }

    std::string get_filename() const { return d_filename; }

    int get_fd() const { return d_fd; }
};
 
} /* namespace http */
 
#endif /*  _bes_http_REMOTE_HTTP_RESOURCE_H_ */