// handles a failure of cancel post-download or pre-download
private void HandleCancel(string uri = null, string fileResultPath = null)
{
_endTime = DateTime.Now.Millisecond;
_elapsedTime = EndTime - StartTime;
_downloading = false;
if (uri != null)
{
UncompletedURLS.Add(uri);
}
if (AbandonOnFailure)
{
if (fileResultPath != null)
{
File.Delete(fileResultPath);
}
for (int i = CompletedURLPaths.Count - 1; i >= 0; i--)
{
File.Delete(CompletedURLPaths[i]);
}
for (int i = PendingURLS.Count - 1; i >= 0; i--)
{
UncompletedURLS.Add(PendingURLS[i]);
}
PendingURLS.Clear();
_progress = 0f;
OnDownloadFailure?.Invoke(DidFinish, uri, fileResultPath);
return;
}
_progress += (1 / _initialCount); // because this value would not be incremented otherwise
OnDownloadFailure?.Invoke(DidFinish, uri, fileResultPath);
}
// constructor to feed in pending urls
public GroupDownloader(List <string> urls = null)
{
if (urls != null)
{
foreach (var str in urls)
{
PendingURLS.Add(str);
}
}
}
// recursive enumerator for downloading all valid file-containing urls in 'PendingURLS'
private async void RecursiveDownload()
{
if (PendingURLS.Count == 0) // handle no URL case
{
HandleCancel();
return;
}
string uri = PendingURLS[0];
if ((OnURIToFilename == null && !UseURIFilenameMap) || (UseURIFilenameMap && !URIFilenameMap.ContainsKey(uri)))
{
HandleCancel();
return;
}
string fileName = UseURIFilenameMap ? URIFilenameMap[uri]: OnURIToFilename(uri);
if (fileName == null && AbandonOnFailure)
{
HandleCancel();
return;
}
var fileResultPath = Path.Combine(DownloadPath, fileName);
PendingURLS.RemoveAt(0);
if (!Downloading) // case cancel invoked
{
HandleCancel(uri, fileResultPath);
if (AbandonOnFailure)
{
return;
}
}
var uwr = new UnityWebRequest(uri);
uwr.timeout = Timeout;
uwr.method = UnityWebRequest.kHttpVerbGET;
var dh = new DownloadHandlerFile(fileResultPath);
dh.removeFileOnAbort = true;
uwr.downloadHandler = dh;
var operation = uwr.SendWebRequest();
while (!operation.isDone)
{
await Task.Delay(100);
}
if (uwr.isNetworkError || uwr.isHttpError || !Downloading) // case network error or cancel invoked
{
HandleCancel(uri, fileResultPath);
if (PendingURLS.Count > 0)
{
RecursiveDownload();
}
}
else // case succcesful download
{
_progress += (float)(1f / (float)_initialCount);
CompletedURLS.Add(uri);
CompletedURLPaths.Add(fileResultPath);
if (PendingURLS.Count > 0) // case more files to download
{
OnDownloadSuccess?.Invoke(DidFinish, uri, fileResultPath);
RecursiveDownload();
}
else // case no more files to download
{
_downloading = false;
_endTime = DateTime.Now.Millisecond;
_elapsedTime = EndTime - StartTime;
OnDownloadSuccess?.Invoke(DidFinish, uri, fileResultPath);
}
}
}
