Blob Trigger for Python Function App is not Firing

Question

I am using Ubuntu 16.04.5 LTS local machine to create and publish Python Function App to Azure using CLI and Azure Functions Core Tools (Ref). I have configured Blob Trigger and my function.json file looks like this:

{ "disabled": false, "scriptFile": "__init__.py", "bindings": [ { "name": "<Blob Trigger Name>", "type": "blobTrigger", "direction": "in", "path": "<Blob Container Name>/{name}", "connection": "<Connection String having storage account and key>" }, { "name": "outputblob", "type": "blob", "path": "<Blob Container Name>", "connection": "<Connection String having storage account and key>", "direction": "out" } ] }

My init.py function looks like this.

def main(<Blob Trigger Name>: func.InputStream, doc: func.Out[func.Document]): logging.info(f"Python blob trigger function processed blob \n" f"Name: {<Blob Trigger Name>.name}\n" f"Blob Size: {<Blob Trigger Name>.length} bytes") logging.basicConfig(filename='example.log',level=logging.DEBUG) logging.debug('This message should go to the log file') logging.info('So should this') logging.warning('And this, too') # Write text to the file. file = open("QuickStart.txt", 'w') file.write("Hello, World!") file.close() # Create the BlockBlockService that is used to call the Blob service for the storage account block_blob_service = BlockBlobService(account_name='<Storage Account Name>', account_key='<Storage Account Key>') container_name='<Blob Container Name>' # Set the permission so the blobs are public. block_blob_service.set_container_acl(container_name, public_access=PublicAccess.Container) # Upload the created file, use local_file_name for the blob name block_blob_service.create_blob_from_path(container_name, 'QuickStart.txt', '')

The Function App is "Always On" but when I upload a blob in the storage the function is not getting triggered. Another Reference Link is this (Ref).

What's going wrong?

Thanks and regards, Shashank

What do your Function host logs (rather than your own example.log logs) look like? — jtlz2
– jtlz2, Commented Jun 24, 2019 at 9:31
Did not run into the same problem as you, but I came across this SO post because my function wasn't getting triggered. Replacing "path": "<Blob Container Name>/" with "path": "<Blob Container Name>/{name}" fixed the issue for me. — James Shapiro
– James Shapiro, Commented Dec 7, 2020 at 5:11

rouhija · Accepted Answer · 2019-05-23 10:31:45Z

Have you checked that the local.settings.json (connection strings for storage accounts) are also in the function app in Azure? They are not published from local machine by default.

You can configure them manually in the portal or use the publish-local-settings flag:

func azure functionapp publish "functionname" --publish-local-settings

Mohit Verma · Accepted Answer · 2019-03-13 10:48:14Z

I tried to reproduce this issue by creating a sample function app in python using Visual studio code with default template and finally deployed in Linux. It worked for me.

Here is the piece of code i have written in pyhton file.

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"Blob Size: {myblob.length} bytes")

and here is the function.json file from my function app.

{ "scriptFile": "__init__.py", "bindings": [ { "name": "myblob", "type": "blobTrigger", "direction": "in", "path": "samples-workitems/{name}", "connection": "" } ] }

I am using 2.0 Azure function , python 3.6 and Azure Functions Core Tools version 2.2.70

this is the reference link i used :

https://learn.microsoft.com/en-us/azure/azure-functions/functions-create-first-function-python

Please try to use this and see if it helps.

Alistair McIntyre · Accepted Answer · 2020-01-21 16:45:23Z

In your main def of py script you have 2nd argument of doc: func.Out[func.Document], which is for cosmos db. This should be an output stream, as its of type blob

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