Azure blob storage function using Python - Setting multiple output bindings is not working

Question

This is the first time to use Azure and I am trying to make a pipeline using Azure. What I want to do is to make multiple outputblobs so that I can duplicate a file.

def main(inputblob: func.InputStream,
         outputblob_first: func.Out[func.InputStream],
         outputblob_second: func.Out[func.InputStream],
         outputblob_third: func.Out[func.InputStream]):
   
   outputblob_first.set(inputblob)
   outputblob_second.set(inputblob)
   outputblob_third.set(inputblob)

This is init.py.

{
  "scriptFile": "__init__.py",
  "bindings": [
    {
      "name": "inputblob",
      "type": "blobTrigger",
      "direction": "in",
      "dataType": "binary",
      "path": "blobcontainer/{name}",
      "connection": "AzureWebJobsStorage"
    },
    {
      "name": "outputblob_first",
      "type": "blob",
      "path": "uploadblobcontainer/{blobtrigger}-first",
      "dataType": "binary",
      "connection": "AzureWebJobsStorage",
      "direction": "out"
    },
    {
      "name": "outputblob_second",
      "type": "blob",
      "path": "uploadblobcontainer/{blobtrigger}-second",
      "dataType": "binary",
      "connection": "AzureWebJobsStorage",
      "direction": "out"
    },
    {
      "name": "outputblob_third",
      "type": "blob",
      "path": "uploadblobcontainer/{blobtrigger}-third",
      "dataType": "binary",
      "connection": "AzureWebJobsStorage",
      "direction": "out"
    }
  ]
}

and this is the json file, function.json

However, it does not work what I expected. I could not find where I did mistake and I want to solve this problem. Can you guys give me some solutions?

How do you trigger this function? Is it successful? Post logs from console/App-Insights? — Kashyap
– Kashyap, Commented Feb 2, 2021 at 16:14
The trigger is when I upload a file to blobcontainer, which is blob storage. It works correctly when I set only one outputblob. When I set multiple outputblobs the log says Host lock lease acquired by instance ID and Singleton lock acquired — Tringles
– Tringles, Commented Feb 2, 2021 at 16:21
post what you see in logs, with one output binding and with multiple output bindings. Also have you tried using func.Out[str] instead of func.Out[func.InputStream]? If not try it out. PS: Host lock lease acquired by instance ID and Singleton lock acquired is always there. Post full log instead of what YOU think is irrelevant. — Kashyap
– Kashyap, Commented Feb 2, 2021 at 16:30

Frank Borzage · Accepted Answer · 2021-02-03 02:05:26Z

1

When I test it for you, I get the following error message:

The 'BlobTrigger' function is in error: The binding name outputblob_first is invalid. Please assign a valid name to the binding.

I think you need to change your binding name. You can refer to my sample:

import logging
import azure.functions as func


def main(inputblob: func.InputStream,
        outputblob1: func.Out[func.InputStream],
        outputblob2: func.Out[func.InputStream],
        outputblob3: func.Out[func.InputStream]):
    logging.info(f"Python blob trigger function processed blob \n"
                 f"Name: {inputblob.name}\n"
                 f"Blob Size: {inputblob.length} bytes")
    outputblob1.set(inputblob)
    outputblob2.set(inputblob)
    outputblob3.set(inputblob)

answered Feb 3, 2021 at 2:05

Frank Borzage

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