Azure HTTPtrigger function not writing to Azure Storage Queue

Question

I am expecting the below code to take a JSON body from func.HttpRequest , write that message to an Azure Storage Queue and then return a success message to the caller. This works except that my Storage Queue is blank.

import logging

import azure.functions as func


def main(req: func.HttpRequest,
         orders: func.Out[func.QueueMessage]) -> func.HttpResponse:


    logging.info('Python HTTP trigger function processed a request.')
    message = req.get_json()
    logging.info(message)
    orders.set(message)
    return func.HttpResponse(
        body=”success”,
        status_code=200
    )

Function.json

{
  "scriptFile": "__init__.py",
  "bindings": [
    {
      "authLevel": "anonymous",
      "type": "httpTrigger",
      "direction": "in",
      "name": "req",
      "methods": [
        "get",
        "post"
      ]
    },
    {
      "type": "http",
      "direction": "out",
      "name": "$return"
    },
  {
    "type": "queue",
    "direction": "out",
    "name": "orders",
    "queueName": "preprocess",
    "connection": "orders_STORAGE"
  }
  ]
}

Local.settings.json

{
  "IsEncrypted": false,
  "Values": {
    "FUNCTIONS_ER_RUNTIME": "python",
    "AzureWebJobsStorage": "AzureWebJobsStorage",
    "orders_STORAGE": "DefaultEndpointsProtocol=https;AccountName=orders;AccountKey=*****;EndpointSuffix=core.windows.net"
  }
}

Terminal output:

… [4/17/2019 5:54:39 PM] Executing 'Functions.QueueTrigger' (Reason='New queue message detected on 'preprocess'.', Id=f27fd7d1-1ace-****-****-00fb021c9ca4)

[4/17/2019 5:54:39 PM] Trigger Details: MessageId: d28f96c5-****-****-9191-93f96a4423de, DequeueCount: 1, InsertionTime: 4/17/2019 5:54:35 PM +00:00

[4/17/2019 5:54:39 PM] INFO: Received FunctionInvocationRequest, request ID: 5bf59a45-****-****-9705-173d9635ca94, function ID: fa626dc9-****-****-a59b-6a48f08d87e1, invocation ID: f27fd7d1-1ace-****-****-00fb021c9ca4

[4/17/2019 5:54:39 PM] Python queue trigger function processed a queue item: name2

[4/17/2019 5:54:39 PM] INFO: Successfully processed FunctionInvocationRequest, request ID: 5bf59a45-****-****-9705-173d9635ca94, function ID: fa626dc9-3313-****-****6a48f08d87e1, invocation ID: f27fd7d1-1ace-****-****-00fb021c9ca4

[4/17/2019 5:54:39 PM] Executed 'Functions.QueueTrigger' (Succeeded, Id=f27fd7d1-1ace-****-****-00fb021c9ca4)

INFO: Successfully processed

– makes me think this worked and I should see a message in my queue, but it is blank.

Why am I not seeing the message in the queue?

Thanks

Answer 1

Your Terminal output shows the QueueTrigger detected the new message preprocess , so actually it has been write in.

As for no message in your queue, because it's processed to your function. After a message is delivered it will be removed from the queue. That's why your queue is blank.

And from the tutorial: Test the function , you could also find the description :

Back in Storage Explorer, click Refresh and verify that the message has been processed and is no longer in the queue.