protected void SignButton_Click(object sender, EventArgs e)
{
if (this.FileUpload1.HasFile)
{
this.InitializeStorage();
// upload the image to blob storage
string uniqueBlobName = string.Format("guestbookpics/image_{0}{1}", Guid.NewGuid().ToString(), Path.GetExtension(this.FileUpload1.FileName));
CloudBlockBlob blob = blobStorage.GetContainerReference("guestbookpics").GetBlockBlobReference(uniqueBlobName);
blob.Properties.ContentType = this.FileUpload1.PostedFile.ContentType;
blob.UploadFromStream(this.FileUpload1.FileContent);
System.Diagnostics.Trace.TraceInformation("Uploaded image '{0}' to blob storage as '{1}'", this.FileUpload1.FileName, uniqueBlobName);
// create a new entry in table storage
GuestBookEntry entry = new GuestBookEntry()
{
GuestName = this.NameTextBox.Text, Message = this.MessageTextBox.Text, PhotoUrl = blob.Uri.ToString(), ThumbnailUrl = blob.Uri.ToString()
};
GuestBookDataSource ds = new GuestBookDataSource();
ds.AddGuestBookEntry(entry);
System.Diagnostics.Trace.TraceInformation("Added entry {0}-{1} in table storage for guest '{2}'", entry.PartitionKey, entry.RowKey, entry.GuestName);
// queue a message to process the image
var queue = queueStorage.GetQueueReference("guestthumbs");
var message = new CloudQueueMessage(string.Format("{0},{1},{2}", uniqueBlobName, entry.PartitionKey, entry.RowKey));
queue.AddMessage(message);
System.Diagnostics.Trace.TraceInformation("Queued message to process blob '{0}'", uniqueBlobName);
}
this.NameTextBox.Text = string.Empty;
this.MessageTextBox.Text = string.Empty;
this.DataList1.DataBind();
}
public override void Run()
{
Trace.TraceInformation("Listening for queue messages...");
while (true)
{
try
{
// retrieve a new message from the queue
CloudQueueMessage msg = this.queue.GetMessage();
if (msg != null)
{
// parse message retrieved from queue
var messageParts = msg.AsString.Split(new char[] { ',' });
var imageBlobUri = messageParts[0];
var partitionKey = messageParts[1];
var rowkey = messageParts[2];
Trace.TraceInformation("Processing image in blob '{0}'.", imageBlobUri);
string thumbnailBlobUri = System.Text.RegularExpressions.Regex.Replace(imageBlobUri, "([^\\.]+)(\\.[^\\.]+)?$", "$1-thumb$2");
CloudBlob inputBlob = this.container.GetBlobReference(imageBlobUri);
CloudBlob outputBlob = this.container.GetBlobReference(thumbnailBlobUri);
using (BlobStream input = inputBlob.OpenRead())
using (BlobStream output = outputBlob.OpenWrite())
{
this.ProcessImage(input, output);
// commit the blob and set its properties
output.Commit();
outputBlob.Properties.ContentType = "image/jpeg";
outputBlob.SetProperties();
// update the entry in table storage to point to the thumbnail
GuestBookDataSource ds = new GuestBookDataSource();
ds.UpdateImageThumbnail(partitionKey, rowkey, thumbnailBlobUri);
// remove message from queue
this.queue.DeleteMessage(msg);
Trace.TraceInformation("Generated thumbnail in blob '{0}'.", thumbnailBlobUri);
}
}
else
{
System.Threading.Thread.Sleep(1000);
}
}
catch (StorageClientException e)
{
Trace.TraceError("Exception when processing queue item. Message: '{0}'", e.Message);
System.Threading.Thread.Sleep(5000);
}
}
}
