private async ThreadingTask UploadAsync(CancellationToken ct, ITaskItem item, HashSet <string> blobsPresent, SemaphoreSlim clientThrottle)
{
if (ct.IsCancellationRequested)
{
Log.LogError("Task UploadToAzure cancelled");
ct.ThrowIfCancellationRequested();
}
string relativeBlobPath = item.GetMetadata("RelativeBlobPath");
if (string.IsNullOrEmpty(relativeBlobPath))
{
throw new Exception(string.Format("Metadata 'RelativeBlobPath' is missing for item '{0}'.", item.ItemSpec));
}
if (!File.Exists(item.ItemSpec))
{
throw new Exception(string.Format("The file '{0}' does not exist.", item.ItemSpec));
}
UploadClient uploadClient = new UploadClient(Log);
if (!Overwrite && blobsPresent.Contains(relativeBlobPath))
{
if (PassIfExistingItemIdentical &&
await ItemEqualsExistingBlobAsync(item, relativeBlobPath, uploadClient, clientThrottle))
{
return;
}
throw new Exception(string.Format("The blob '{0}' already exists.", relativeBlobPath));
}
string contentType = item.GetMetadata("ContentType");
await clientThrottle.WaitAsync();
try
{
Log.LogMessage("Uploading {0} to {1}.", item.ItemSpec, ContainerName);
await
uploadClient.UploadBlockBlobAsync(
ct,
AccountName,
AccountKey,
ContainerName,
item.ItemSpec,
relativeBlobPath,
contentType,
UploadTimeoutInMinutes);
}
finally
{
clientThrottle.Release();
}
}
private async Task <bool> ItemEqualsExistingBlobAsync(
ITaskItem item,
string relativeBlobPath,
UploadClient client,
SemaphoreSlim clientThrottle)
{
await clientThrottle.WaitAsync();
try
{
return(await client.FileEqualsExistingBlobAsync(
AccountName,
AccountKey,
ContainerName,
item.ItemSpec,
relativeBlobPath,
UploadTimeoutInMinutes));
}
finally
{
clientThrottle.Release();
}
}