public async Task<UploadResult> UploadAsync(UploadRequest request)
{
// validate input
_pathBuilder.Validate(request.PathFormat);
// initialize
request.Trace.Write("Initializing...");
var context = new CloudContext(request.ConnectionString, request.Container);
await context.BlobContainer.CreateIfNotExistsAsync(
BlobContainerPublicAccessType.Blob,
new BlobRequestOptions(),
null);
request.Trace.WriteLine(" done.");
// set the direct
var result = new UploadResult();
CloudBlockBlob directBlob = null;
if (request.UploadDirect)
{
if (request.Type == UploadRequestType.Number)
{
directBlob = await UploadDirectNumberAsync(request, context, result);
}
else
{
directBlob = await UploadDirectTimestampAsync(request, context);
}
}
// set the latest
CloudBlockBlob latestBlob = null;
if (request.UploadLatest)
{
var latestPath = _pathBuilder.GetLatest(request.PathFormat);
if (directBlob == null)
{
latestBlob = await UploadBlobAsync(context, request, latestPath, direct: false);
}
else
{
request.Trace.Write($"Copying the direct blob to the latest blob at '{latestPath}'...");
latestBlob = context.BlobContainer.GetBlockBlobReference(latestPath);
var sourceAccessCondition = new AccessCondition {IfMatchETag = directBlob.Properties.ETag};
var destAccessCondition = new AccessCondition {IfMatchETag = request.ETag};
await latestBlob.StartCopyAsync(directBlob, sourceAccessCondition, destAccessCondition, null, null);
while (latestBlob.CopyState.Status == CopyStatus.Pending)
{
await Task.Delay(100);
await latestBlob.ExistsAsync();
}
request.Trace.WriteLine(" done.");
}
}
request.Trace.WriteLine();
if (directBlob != null)
{
result.DirectUri = directBlob.Uri;
result.DirectETag = directBlob.Properties.ETag;
request.Trace.WriteLine($"Direct: {directBlob.Uri}");
}
if (latestBlob != null)
{
result.LatestUri = latestBlob.Uri;
result.LatestETag = latestBlob.Properties.ETag;
request.Trace.WriteLine($"Latest: {latestBlob.Uri}");
}
return result;
}
private async Task<CloudBlockBlob> UploadDirectNumberAsync(UploadRequest request, CloudContext context, UploadResult result)
{
var latestNumberPath = _pathBuilder.GetDirect(request.PathFormat, 0);
var latestNumberBlob = context.BlobContainer.GetBlockBlobReference(latestNumberPath);
string latestNumberEtag = null;
var latestNumber = 0;
if (request.LatestNumber.HasValue)
{
// Use the provided version number
latestNumberEtag = request.LatestNumberETag;
latestNumber = request.LatestNumber.Value;
}
else
{
// Determine what version number what last used
try
{
await latestNumberBlob.FetchAttributesAsync();
latestNumberEtag = latestNumberBlob.Properties.ETag;
var latestNumberString = latestNumberBlob.Metadata[LatestNumberMetadataKey];
latestNumber = int.Parse(latestNumberString);
}
catch (StorageException e)
{
if (e.RequestInformation.HttpStatusCode != 404)
{
throw;
}
}
latestNumber++;
}
// Upload the stream
var latestPath = _pathBuilder.GetDirect(request.PathFormat, latestNumber);
var directBlob = await UploadBlobAsync(context, request, latestPath, direct: true);
// Update the latest version record
AccessCondition accessCondition;
if (!request.UseETags)
{
accessCondition = null;
}
else if (latestNumberEtag != null)
{
accessCondition = AccessCondition.GenerateIfMatchCondition(latestNumberEtag);
}
else
{
accessCondition = AccessCondition.GenerateIfNoneMatchCondition("*");
}
latestNumberBlob.Metadata[LatestNumberMetadataKey] = latestNumber.ToString();
await latestNumberBlob.UploadFromByteArrayAsync(new byte[0], 0, 0, accessCondition, options: null, operationContext: null);
// Set the latest etag and number on the result
result.LatestNumberETag = latestNumberBlob.Properties.ETag;
result.LatestNumber = latestNumber;
return directBlob;
}