public void Download(CancellationToken cancellationToken)
{
Assert.MethodCalledOnlyOnce(ref _downloadHasBeenCalled, "Download");
DebugLogger.Log("Downloading.");
List <ResourceUrl> validUrls = new List <ResourceUrl>(_resource.ResourceUrls);
// getting through urls list backwards, because urls may be removed during the process,
// and it's easier to iterate that way
validUrls.Reverse();
int retry = RetriesAmount;
while (validUrls.Count > 0 && retry > 0)
{
for (int i = validUrls.Count - 1; i >= 0 && retry-- > 0; --i)
{
ResourceUrl url = validUrls[i];
try
{
OpenFileStream();
Download(url, cancellationToken);
CloseFileStream();
var validator = new DownloadedResourceValidator();
validator.Validate(_destinationFilePath, _resource);
return;
}
catch (WebException e)
{
// Isn't this catching too much?
DebugLogger.LogException(e);
// try again
break;
}
catch (DownloaderException downloaderException)
{
DebugLogger.LogException(downloaderException);
switch (downloaderException.Status)
{
case DownloaderExceptionStatus.EmptyStream:
// try another one
break;
case DownloaderExceptionStatus.CorruptData:
// try another one
break;
case DownloaderExceptionStatus.NotFound:
// remove url and try another one
validUrls.Remove(url);
break;
case DownloaderExceptionStatus.Other:
// try another one
break;
default:
throw new ArgumentOutOfRangeException();
}
}
finally
{
CloseFileStream();
}
}
DebugLogger.Log("Waiting 10 seconds before trying again...");
Thread.Sleep(10000);
}
if (retry <= 0)
{
throw new DownloaderException("Too many retries, aborting.", DownloaderExceptionStatus.Other);
}
throw new DownloaderException("Cannot download resource.", DownloaderExceptionStatus.Other);
}
public void Download(CancellationToken cancellationToken)
{
Assert.MethodCalledOnlyOnce(ref _downloadHasBeenCalled, "Download");
DebugLogger.Log("Downloading.");
var validUrls = new List <string>(_mirrorUrls);
validUrls.Reverse();
int retry = RetriesAmount;
while (validUrls.Count > 0 && retry > 0)
{
for (int i = validUrls.Count - 1; i >= 0 && retry-- > 0; --i)
{
string url = validUrls[i];
try
{
OpenFileStream();
Download(url, cancellationToken);
CloseFileStream();
if (_resource.HasValue)
{
var validator = new DownloadedResourceValidator();
validator.Validate(_destinationFilePath, _resource.Value);
}
return;
}
catch (DownloadedResourceValidationException validationException)
{
DebugLogger.LogException(validationException);
validUrls.Remove(url);
}
catch (DownloaderException downloaderException)
{
DebugLogger.LogException(downloaderException);
switch (downloaderException.Status)
{
case DownloaderExceptionStatus.EmptyStream:
// try another one
break;
case DownloaderExceptionStatus.CorruptData:
// try another one
break;
case DownloaderExceptionStatus.NotFound:
// remove url and try another one
validUrls.Remove(url);
break;
case DownloaderExceptionStatus.Other:
// try another one
break;
default:
throw new ArgumentOutOfRangeException();
}
}
finally
{
CloseFileStream();
}
}
DebugLogger.Log("Waiting 10 seconds before trying again...");
Thread.Sleep(10000);
}
if (retry <= 0)
{
throw new DownloaderException("Too many retries, aborting.", DownloaderExceptionStatus.Other);
}
throw new DownloaderException("Cannot download resource.", DownloaderExceptionStatus.Other);
}
