Azure Functions - BlobTrigger - How to trigger function with any file in a container?

Question

I'm facing a problem with an Azure Function.

I've build an Azure Function triggered by a new file on a container of a storage account. The problem is that it seems impossible (to me) to trigger the function with a generic file, without specifing a name!

I've searched on official documentation and it's not specified how to reference a generic file. The expected behaviour is to have a function triggered when I upload any file (with any name) in a specific container, something like "container/*".

This is my simple function:

function.json

{
  "scriptFile": "__init__.py",
  "bindings": [
    {
      "name": "inputBlob",
      "type": "blobTrigger",
      "direction": "in",
      "path": "premium-input/*",
      "connection": "AzureWebJobsStorage"
    }
  ]
}

init.py

import logging
import azure.functions as func


def main(inputBlob: func.InputStream):
    logging.info("START EXECUTION")
    logging.info(f'NAME {inputBlob.name}')
    logging.info(f'URI {inputBlob.uri}')
    logging.info("END EXECUTION")

I've already tried using an event on EventGrid, but I prefer avoiding it...

Can you please help me?

Thanks in advance!!

As currently configured it should be triggered when a blob is uploaded to the premium-input container in the specified storage account — Peter Bons
– Peter Bons, Commented May 24, 2023 at 17:37
Have you tried to set the path to "path": "premium-input/{name}". I didn't find any documentation which says to set it to /*. — Anupam Chand
– Anupam Chand, Commented May 25, 2023 at 4:05
@PeterBons This would be the expected behavious, but this is actually the problem: with the configuration above the function is never triggered — walzer91
– walzer91, Commented May 25, 2023 at 8:45

Ikhtesam Afrin · Accepted Answer · 2023-05-25 05:18:59Z

2

I have tried to upload generic files to a container as below and my function got triggered. If you will change the path premium-input/* to premium-input/{name} , it will work.

init.py

import logging
import azure.functions as func
def main(myblob: func.InputStream):
logging.info(f"Python blob trigger function processed blob \n"
f"Name: {myblob.name}\n"
f"URI: {myblob.uri}\n"
f"Blob Size: {myblob.length} bytes")

function.json

{
"bindings": [
{
"name": "myblob",
"type": "blobTrigger",
"direction": "in",
"path": "demo/{name}",
"connection": "your connection string"
}
]
}

Container- enter image description here

Logs- enter image description here

enter image description here

answered May 25, 2023 at 5:18

Ikhtesam Afrin

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1 Comment

walzer91 Over a year ago

Thank you so much! Actually I had another problem that masked the correct behaviour, the Log Stream didn't update. Thanks!

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