private async Task DeleteAdBlobsAsync(Ad ad)
{
if (!string.IsNullOrWhiteSpace(ad.ImageURL))
{
Trace.TraceInformation("Deleting image blob {0}", ad.ImageURL);
CloudBlockBlob blobToDelete = imagesBlobContainer.GetBlockBlobReference(ad.GetImageFileName());
await blobToDelete.DeleteAsync();
}
if (!string.IsNullOrWhiteSpace(ad.ThumbnailURL))
{
Trace.TraceInformation("Deleting thumbnail blob {0}", ad.ThumbnailURL);
CloudBlockBlob blobToDelete = imagesBlobContainer.GetBlockBlobReference(ad.GetThumbnailFileName());
await blobToDelete.DeleteAsync();
}
}
private void ProcessQueueMessage(CloudQueueMessage msg)
{
Trace.TraceInformation("Processing queue message {0}", msg);
// Queue message contains AdId.
var adId = int.Parse(msg.AsString);
Ad ad = db.Ads.Find(adId);
if (ad == null)
{
throw new Exception(String.Format("AdId {0} not found, can't create thumbnail", adId.ToString()));
}
CloudBlockBlob inputBlob = this.imagesBlobContainer.GetBlockBlobReference(ad.GetImageFileName());
string thumbnailName = Path.GetFileNameWithoutExtension(inputBlob.Name) + "thumb.jpg";
CloudBlockBlob outputBlob = this.imagesBlobContainer.GetBlockBlobReference(thumbnailName);
using (Stream input = inputBlob.OpenRead())
using (Stream output = outputBlob.OpenWrite())
{
ConvertImageToThumbnailJPG(input, output);
outputBlob.Properties.ContentType = "image/jpeg";
}
Trace.TraceInformation("Generated thumbnail in blob {0}", thumbnailName);
ad.ThumbnailURL = outputBlob.Uri.ToString();
db.SaveChanges();
Trace.TraceInformation("Updated thumbnail URL in database: {0}", ad.ThumbnailURL);
// Remove message from queue.
this.imagesQueue.DeleteMessage(msg);
}