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()));
}
Uri blobUri = new Uri(ad.ImageURL);
string blobName = blobUri.Segments[blobUri.Segments.Length - 1];
CloudBlockBlob inputBlob = this.imagesBlobContainer.GetBlockBlobReference(blobName);
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);
}
public static void GenerateThumbnail(
[QueueTrigger("thumbnailrequest")] BlobInformation blobInfo,
[Blob("images/{BlobName}", FileAccess.Read)] Stream input,
[Blob("images/{BlobNameWithoutExtension}_thumbnail.jpg")] CloudBlockBlob outputBlob)
{
using (Stream output = outputBlob.OpenWrite())
{
ConvertImageToThumbnailJPG(input, output);
outputBlob.Properties.ContentType = "image/jpeg";
}
// Entity Framework context class is not thread-safe, so it must
// be instantiated and disposed within the function.
using (ContosoAdsContext db = new ContosoAdsContext())
{
var id = blobInfo.AdId;
Ad ad = db.Ads.Find(id);
if (ad == null)
{
throw new Exception(String.Format("AdId {0} not found, can't create thumbnail", id.ToString()));
}
ad.ThumbnailURL = outputBlob.Uri.ToString();
db.SaveChanges();
}
}
private void ProcessTimestampQueue(CloudQueueMessage msg)
{
Trace.TraceInformation("Processing queue message {0}", msg);
var adId = int.Parse(msg.AsString);
Ad ad = db.Ads.Find(adId);
if (ad == null)
{
throw new Exception(String.Format("AdId {0} not found", adId.ToString()));
}
Uri blobUri = new Uri(ad.ImageURL);
string blobName = blobUri.Segments[blobUri.Segments.Length - 1];
CloudBlockBlob inputBlob = this.imagesBlobContainer.GetBlockBlobReference(blobName);
string newName = Path.GetFileNameWithoutExtension(inputBlob.Name) + "new.jpg";
CloudBlockBlob outputBlob = this.imagesBlobContainer.GetBlockBlobReference(newName);
using (Stream input = inputBlob.OpenRead())
using (Stream output = outputBlob.OpenWrite())
{
AddTimestampToImage(input, output);
outputBlob.Properties.ContentType = "image/jpeg";
}
Trace.TraceInformation("Generated timestamp in blob {0}", newName);
ad.ImageURL = outputBlob.Uri.ToString();
db.SaveChanges();
Trace.TraceInformation("Updated timestamp URL in database: {0}", ad.ImageURL);
this.timeQueue.DeleteMessage(msg);
}
