/// <summary>
/// Write a slice of data using the UploadSliceRequest.
/// </summary>
/// <param name="uploadSliceRequest">The UploadSliceRequest to make the request with.</param>
/// <param name="exceptionTrackingList">A list of exceptions to use to track progress. SlicedUpload may retry.</param>
private async Task <UploadResult <T> > UploadSliceAsync(UploadSliceRequest <T> uploadSliceRequest, ICollection <Exception> exceptionTrackingList)
{
var firstAttempt = true;
this._uploadStream.Seek(uploadSliceRequest.RangeBegin, SeekOrigin.Begin);
while (true)
{
using (var requestBodyStream = new ReadOnlySubStream(this._uploadStream, uploadSliceRequest.RangeBegin, uploadSliceRequest.RangeLength))
{
try
{
return(await uploadSliceRequest.PutAsync(requestBodyStream).ConfigureAwait(false));
}
catch (ServiceException exception)
{
if (exception.IsMatch("generalException") || exception.IsMatch("timeout"))
{
if (firstAttempt)
{
firstAttempt = false;
exceptionTrackingList.Add(exception);
}
else
{
throw;
}
}
else if (exception.IsMatch("invalidRange"))
{
// Succeeded previously, but nothing to return right now
return(new UploadResult <T>());
}
else
{
throw;
}
}
}
}
}
/// <summary>
/// Get the series of requests needed to complete the upload session. Call <see cref="UpdateSessionStatusAsync"/>
/// first to update the internal session information.
/// </summary>
/// <returns>All requests currently needed to complete the upload session.</returns>
internal IEnumerable <UploadSliceRequest <T> > GetUploadSliceRequests()
{
foreach (var(item1, item2) in this._rangesRemaining)
{
var currentRangeBegins = item1;
while (currentRangeBegins <= item2)
{
var nextSliceSize = NextSliceSize(currentRangeBegins, item2);
var uploadRequest = new UploadSliceRequest <T>(
this.Session.UploadUrl,
this._client,
currentRangeBegins,
currentRangeBegins + nextSliceSize - 1,
this.TotalUploadLength);
yield return(uploadRequest);
currentRangeBegins += nextSliceSize;
}
}
}
