private void CloseFileStream()
{
if (_fileStream != null)
{
_fileStream.Dispose();
_fileStream = null;
}
}
private void OpenFileStream()
{
if (_fileStream == null)
{
_fileStream = new ChunkedFileStream(_destinationFilePath, _resource.Size, _resource.ChunksData,
HashFunction, ChunkedFileStream.WorkFlags.PreservePreviousFile);
}
}
private bool TryDownload(ResourceUrl url, ChunkedFileStream fileStream, CancellationToken cancellationToken)
{
try
{
_logger.LogDebug(string.Format("Trying to download from {0}", url.Url));
_logger.LogTrace("fileStream.VerifiedLength = " + fileStream.VerifiedLength);
var downloadJobQueue = BuildDownloadJobQueue(url, fileStream.VerifiedLength);
foreach (var downloadJob in downloadJobQueue)
{
_logger.LogDebug(string.Format("Executing download job {0} with offest {1}", downloadJob.Url,
downloadJob.Range.Start));
_logger.LogTrace("fileStream.VerifiedLength = " + fileStream.VerifiedLength);
_logger.LogTrace("fileStream.SavedLength = " + fileStream.SavedLength);
var baseHttpDownloader = new BaseHttpDownloader(downloadJob.Url, 30000);
baseHttpDownloader.SetBytesRange(downloadJob.Range);
const long downloadStatusLogInterval = 5000L;
var stopwatch = Stopwatch.StartNew();
long downloadedBytes = 0;
var job = downloadJob;
baseHttpDownloader.DataAvailable += (bytes, length) =>
{
fileStream.Write(bytes, 0, length);
downloadedBytes += length;
if (stopwatch.ElapsedMilliseconds > downloadStatusLogInterval)
{
stopwatch.Reset();
stopwatch.Start();
_logger.LogDebug(string.Format("Downloaded {0} from {1}", downloadedBytes, job.Url));
_logger.LogTrace("fileStream.VerifiedLength = " + fileStream.VerifiedLength);
_logger.LogTrace("fileStream.SavedLength = " + fileStream.SavedLength);
}
OnDownloadProgressChanged(fileStream.VerifiedLength);
};
baseHttpDownloader.Download(cancellationToken);
_logger.LogDebug("Download job execution success.");
_logger.LogTrace("fileStream.VerifiedLength = " + fileStream.VerifiedLength);
_logger.LogTrace("fileStream.SavedLength = " + fileStream.SavedLength);
}
if (fileStream.RemainingLength != 0)
{
throw new IncompleteDataException("Chunks downloading must finish downloading whole file");
}
_logger.LogDebug(string.Format("Download from {0} has been successful.", url.Url));
return(true);
}
catch (IncompleteDataException e)
{
_logger.LogWarning(string.Format("Unable to download from {0}", url.Url), e);
return(false);
}
catch (InvalidChunkDataException e)
{
_logger.LogWarning(string.Format("Unable to download from {0}", url.Url), e);
return(false);
}
catch (DataNotAvailableException e)
{
_logger.LogWarning(string.Format("Unable to download from {0}", url.Url), e);
return(false);
}
catch (ServerErrorException e)
{
_logger.LogWarning(string.Format("Unable to download from {0}", url.Url), e);
return(false);
}
catch (ConnectionFailureException e)
{
_logger.LogWarning(string.Format("Unable to download from {0}", url.Url), e);
return(false);
}
}
