/// <remarks>
/// http://blog.geuer-pollmann.de/blog/2014/07/21/uploading-blobs-to-azure-the-robust-way/
/// http://wely-lau.net/2012/02/26/uploading-big-files-in-windows-azure-blob-storage-with-putlistblock/
/// </remarks>
private static async Task UploadStreamAsync(CloudBlockBlob blob, Stream st, Action <long> uploadProgress = null)
{
bool small = false;
long uploaded = 0;
try
{
small = st.Length <= UploadChunkSize;
}
catch (Exception) { }
if (small)
{
uploaded = st.Length;
await blob.UploadFromStreamAsync(st);
}
else
{
var blocklist = new List <string>();
var buf = new byte[UploadChunkSize];
for (;;)
{
var read = await st.ReadAsync(buf, 0, buf.Length);
if (read <= 0)
{
break;
}
var blockId = Base64.ToBase64String(Salt.CreateRandomBuf(32));
using (var mst = new MemoryStream(buf, 0, read, false))
{
await blob.PutBlockAsync(blockId, mst, null);
}
uploaded += read;
uploadProgress?.Invoke(uploaded);
blocklist.Add(blockId);
}
await blob.PutBlockListAsync(blocklist);
}
uploadProgress?.Invoke(uploaded);
}