downloader.h

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/*
 * Copyright (C) 2022 Paul Davis <paul@linuxaudiosystems.com>
 *
 * This program 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.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#ifndef __libpbd_downloader_h__
#define __libpbd_downloader_h__
 
#include <atomic>
#include <string>
 
#include <curl/curl.h>
 
#include "pbd/libpbd_visibility.h"
 
namespace PBD {
 
class Thread;
 
class LIBPBD_API Downloader {
  public:
        Downloader (std::string const & url, std::string const & destdir);
        ~Downloader ();
 
        int start ();
        void cleanup ();
        void cancel ();
        double progress() const;
 
        uint64_t download_size() const { return _download_size; }
        uint64_t downloaded () const { return _downloaded; }
 
        /* public so it can be called from a static C function */
        size_t write (void *contents, size_t size, size_t nmemb);
 
        int status() const { return _status; }
        std::string download_path() const;
 
  private:
        std::string url;
        std::string destdir;
        std::string file_path;
        FILE* file;
        CURL* curl;
        bool _cancel;
        std::atomic<uint64_t> _download_size; /* read-only from requestor thread */
        std::atomic<uint64_t> _downloaded; /* read-only from requestor thread */
        std::atomic<int> _status;
        PBD::Thread* thread;
 
        void download ();
};
 
} /* namespace */
 
#endif