/// <summary>
/// Uploads a stream that doesn't have a known length. In this case we can't do any optimizations like creating a request before we read all of the data.
/// </summary>
/// <param name="source">The stream that is the source of data.</param>
/// <param name="options">An object that specifies any additional options for the request.</param>
/// <param name="blockSize">The block size to be used (null - no blocks).</param>
/// <returns>A sequence that represents uploading the blob.</returns>
/// <remarks>This is implemented by creating a BlobStream and using that to buffer data until we have sufficient amount to be sent.</remarks>
private TaskSequence UploadUnknownSizeStream(Stream source, BlobRequestOptions options, long blockSize)
{
// Potential Improvement: is there a better uploading scheme in absense of a known length
// This function is more a defensive measure; it should be rarely called, if ever. (Can seekable stream not have length?
// Cannot close as this is deferred execution
var target = this.OpenWrite(options);
target.BlockSize = blockSize;
return source.WriteToAndCloseOutput(target);
}
/// <summary>
/// Uploads the blob with blocks.
/// </summary>
/// <param name="source">The source stream.</param>
/// <param name="options">An object that specifies any additional options for the request.</param>
/// <param name="blockSize">The size of the block.</param>
/// <returns>A <see cref="TaskSequence"/> that uploads the blob.</returns>
private TaskSequence UploadBlobWithBlocks(Stream source, BlobRequestOptions options, long blockSize)
{
CommonUtils.AssertNotNull("modifers", options);
var target = this.OpenWrite(options);
target.BlockSize = blockSize;
return source.WriteToAndCloseOutput(target);
}