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livetrax/libs/pbd/downloader.cc

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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.
*/
#include <glib/gstdio.h>
#include <glibmm/fileutils.h>
#include <glibmm/miscutils.h>
#include "pbd/downloader.h"
#include "pbd/error.h"
#include "pbd/i18n.h"
#include "pbd/pthread_utils.h"
using namespace PBD;
using std::string;
static size_t
CurlWrite_CallbackFunc_Downloader(void *contents, size_t size, size_t nmemb, Downloader* dl)
{
return dl->write (contents, size, nmemb);
}
size_t
Downloader::write (void *ptr, size_t size, size_t nmemb)
{
if (_cancel) {
fclose (file);
file = 0;
::g_unlink (file_path.c_str());
_downloaded = 0;
_download_size = 0;
return 0;
}
size_t nwritten = fwrite (ptr, size, nmemb, file);
_downloaded += nwritten;
return nwritten;
}
Downloader::Downloader (string const & u, string const & dir)
: url (u)
, destdir (dir)
, file (0)
, _cancel (false)
, _download_size (0)
, _downloaded (0)
{
}
Downloader::~Downloader ()
{
cleanup();
}
int
Downloader::start ()
{
file_path = Glib::build_filename (destdir, Glib::path_get_basename (url));
if (!(file = fopen (file_path.c_str(), "w"))) {
return -1;
}
_cancel = false;
_status = 0; /* unknown at this point */
return 0 != (thread = PBD::Thread::create (boost::bind (&Downloader::download, this)));
}
void
Downloader::cleanup ()
{
thread->join ();
}
void
Downloader::cancel ()
{
_cancel = true;
}
double
Downloader::progress () const
{
if (_download_size == 0) {
return 0.;
}
return (double) _downloaded / _download_size;
}
void
Downloader::download ()
{
char curl_error[CURL_ERROR_SIZE];
{
/* First curl fetch to get the data size so that we can offer a
* progress meter
*/
curl = curl_easy_init ();
if (!curl) {
_status = -1;
return;
}
/* get size */
curl_easy_setopt (curl, CURLOPT_URL, url.c_str());
curl_easy_setopt(curl, CURLOPT_NOBODY, 1L);
curl_easy_setopt(curl, CURLOPT_HEADER, 0L);
curl_easy_setopt (curl, CURLOPT_FOLLOWLOCATION, 1L);
curl_easy_setopt (curl, CURLOPT_ERRORBUFFER, curl_error);
CURLcode res = curl_easy_perform (curl);
if (res == CURLE_OK) {
double dsize;
curl_easy_getinfo (curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &dsize);
_download_size = dsize;
}
curl_easy_cleanup (curl);
if (res != CURLE_OK ) {
error << string_compose (_("Download failed, error code %1 (%2)"), curl_easy_strerror (res), curl_error) << endmsg;
_status = -2;
return;
}
}
curl = curl_easy_init ();
if (!curl) {
_status = -1;
return;
}
curl_easy_setopt (curl, CURLOPT_URL, url.c_str());
curl_easy_setopt (curl, CURLOPT_FOLLOWLOCATION, 1L);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, CurlWrite_CallbackFunc_Downloader);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, this);
CURLcode res = curl_easy_perform (curl);
curl_easy_cleanup (curl);
if (res == CURLE_OK) {
_status = 1;
} else {
_status = -1;
}
if (file) {
fclose (file);
file = 0;
}
}
std::string
Downloader::download_path() const
{
/* Can only return the download path if we completed, and completed successfully */
if (_status > 0) {
return file_path;
}
return std::string();
}