private void ProcessOCRQueueMessage(CloudQueueMessage queueMessage)
{
var messageContent = queueMessage.AsString;
Trace.TraceInformation("Processing OCR queue message: " + messageContent);
OCRQueueMessage ocrMessage = null;
Exception exception = null;
try
{
ocrMessage = OCRQueueMessage.Parse(messageContent);
string imageFileName = SaveImageBlobToLocalFile(ocrMessage.ImageBlobName);
string ocrTextFileName = PerformOCROnImageFile(imageFileName);
string ocrBlobName = new FileInfo(ocrTextFileName).Name;
CloudBlockBlob textBlob = StoreRecognizedTextAsBlob(ocrTextFileName, ocrBlobName);
CreateEmailTask(ocrMessage.JobID, textBlob.Name, ocrMessage.RecipientEmail);
DeleteInputImage(ocrMessage.ImageBlobName);
DeleteTemporaryFiles(imageFileName, ocrTextFileName);
}
catch (Exception ex)
{
Trace.TraceError("An error occurred while processing OCR message. Details: " + ex);
exception = ex;
if (ocrMessage == null)
{
Trace.TraceError("Invalid message format. Deleting.");
AzureQueues.OCRQueue.DeleteMessage(queueMessage);
return;
}
}
try
{
var job = AzureTables.OCRJobRepository.GetOCRJob(ocrMessage.JobID, ocrMessage.RecipientEmail);
if (exception == null)
{
job.IsCompleted = true;
job.ErrorMessage = null;
AzureTables.OCRJobRepository.UpdateOCRJob(job);
Trace.TraceInformation("Message (JobID = {0}) successfully processed, deleting.", ocrMessage.JobID);
AzureQueues.OCRQueue.DeleteMessage(queueMessage);
}
else
{
job.IsCompleted = true;
job.ErrorMessage = exception.ToString();
AzureTables.OCRJobRepository.UpdateOCRJob(job);
}
}
catch (Exception ex)
{
Trace.TraceError("Failed to update job status: " + ex);
}
}
