private static void CreateOCRQueueItem(Guid jobID, string blobName, string emailAddress)
{
var message = new OCRQueueMessage(jobID, blobName, emailAddress);
var wrappedMessage = new CloudQueueMessage(message.ToString());
AzureQueues.OCRQueue.AddMessage(wrappedMessage);
}
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);
}
}
private static void StartOCR(ReceiptQueueMessage receiptQueueItem, ICollector <string> receiptOCRQueue)
{
// add message to OCR queue
var OCRCallbackKey = ConfigurationManager.AppSettings["OCRCallbackKey"];
var baseCallbackAddress = ConfigurationManager.AppSettings["BaseCallbackAddress"];
string imageUrl = string.Empty;
if (TryGetBlobLink(receiptQueueItem, out imageUrl))
{
var message = new OCRQueueMessage()
{
ItemId = receiptQueueItem.ExpenseId,
ItemType = "receipt",
ImageUrl = imageUrl,
Callback = $"{baseCallbackAddress}/ocrCallback?code={OCRCallbackKey}"
};
receiptOCRQueue.Add(JsonConvert.SerializeObject(message));
}
}
public async static Task Run([QueueTrigger("ocrqueue", Connection = "AzureWebJobsStorage")] OCRQueueMessage myQueueItem,
int dequeueCount,
TraceWriter log)
{
log.Info($"C# Queue trigger function processed: {myQueueItem}");
OCRResult res = await MakeOCRRequest(myQueueItem.ItemId, myQueueItem.ImageUrl, dequeueCount, log);
// perform callback
using (var client = new HttpClient())
{
var content = new StringContent(JsonConvert.SerializeObject(res), Encoding.UTF8, "application/json");
log.Info($"callback: {myQueueItem.Callback}");
log.Info($"image: {myQueueItem.ImageUrl}");
var result = await client.PostAsync(myQueueItem.Callback, content);
log.Info($"result: {result.StatusCode}");
}
}
