public async static Task <object> Run(
[HttpTrigger(AuthorizationLevel.Function, "post", Route = "")] HttpRequestMessage req,
[Table("receiptsTable", Connection = "AzureWebJobsStorage")] CloudTable receiptTable,
[Queue("receiptitems", Connection = "AzureWebJobsStorage")] ICollector <ReceiptQueueMessage> receiptQueue,
TraceWriter log)
{
log.Info($"Webhook was triggered!");
string jsonContent = await req.Content.ReadAsStringAsync();
OCRResult result = JsonConvert.DeserializeObject <OCRResult>(jsonContent);
if (result.StatusCode == "Retry")
{
// there is a possibility the OCR processing failed because the service was unavailable or there was too many
// concurrent connections (this is something that can happen with Azure ML web services
// therefore, rather than throwing an error, re-add the expense item back to the queue and try to re-process.
// queue message to move to next step
receiptQueue.Add(new ReceiptQueueMessage
{
ExpenseId = result.ItemId,
Status = "Retry",
ProcessingStep = 99 // set to 99 to restart process
});
}
else
{
// the process either succeeded or failed in which case update the table with the appropriate data or error text
// inform the expense processor (via a queue message) that processing is complete
// add row to results table
var item = new ReceiptTableItem()
{
PartitionKey = "key",
RowKey = result.ItemId,
ExpenseId = result.ItemId,
RawText = result.Text,
ErrorText = result.ErrorText,
ETag = "*"
};
var operation = TableOperation.Merge(item);
await receiptTable.ExecuteAsync(operation);
// queue message to move to next step
receiptQueue.Add(new ReceiptQueueMessage
{
ExpenseId = result.ItemId,
Status = result.StatusCode == "Success" ? "Complete" : "Error",
ProcessingStep = 1 // set to 1 to complete processing
});
}
return(req.CreateResponse(HttpStatusCode.OK));
}
private async static void UpdateTableStatus(CloudTable receiptsTable, string status, string id)
{
// update row int results table
var item = new ReceiptTableItem()
{
PartitionKey = "key",
RowKey = id,
Status = status,
ETag = "*"
};
var operation = TableOperation.Merge(item);
await receiptsTable.ExecuteAsync(operation);
}
private static async Task CreateTableEntry(ReceiptQueueMessage receiptQueueItem, CloudTable receiptsTable)
{
// create table entry
var item = new ReceiptTableItem()
{
PartitionKey = "key",
RowKey = receiptQueueItem.ExpenseId,
ExpenseId = receiptQueueItem.ExpenseId,
UserId = receiptQueueItem.UserId,
Status = "Processing"
};
var operation = TableOperation.Insert(item);
await receiptsTable.ExecuteAsync(operation);
}
