Azure Function App: Unable to import BlobServiceClient, BlobClient

Question

I have an Azure Function as below:

import azure.functions as func
import logging
import os
import tempfile
import subprocess
import json
from pathlib import Path
import glob  

app = func.FunctionApp()


@app.blob_trigger(
    arg_name="myblob",
    path="cssinputbuckettest/{name}.MF4",
    connection="cssdatalakestoragegen2_STORAGE",
)
def BlobTrigger1(myblob: func.InputStream):
    logging.info(
        f"Python blob trigger function processed blob "
        f"Name: {myblob.name} "
        f"Blob Size: {myblob.length} bytes"
    )
...

I can publish my function without issues.

However, in my script I need to use BlobServiceClient, BlobClient to download other files than the trigger blob. Therefore I add the statement below after the other import statements:

from azure.storage.blob import BlobServiceClient, BlobClient

When doing this, however, my publish fails and no function is pushed. Should I download other blobs into my Function in a different way?

You want to trigger the blobtrigger using the downloaded file using Blobserviveclient, when when downloaded is uploaded to blob container it wikll trigger blob trigger? — Vivek Vaibhav Shandilya
– Vivek Vaibhav Shandilya, Commented Apr 27, 2024 at 3:26
My function is triggered when a specific file type is uploaded, MF4 log files. Upon upload, I need to also download another supporting file from my container, a JSON file. In order to do so I am looking to use the blobclient as outlined, but that seems not possible. — mfcss
– mfcss, Commented Apr 27, 2024 at 7:41

Vivek Vaibhav Shandilya · Accepted Answer · 2024-04-28 11:24:14Z

In Python Function, Make sure your code syntax is correct and make sure you are using correct packages.

This worked for me.

I am uploading a *.txt file and downloading download.json file will is available in blob container.

function_app.py

import azure.functions as func
import logging
from azure.storage.blob import *
import os

app= func.FunctionApp()

@app.blob_trigger(arg_name="myblob", path="download/{name}.txt",
                               connection="Storage_conn") 
def BlobTrigger(myblob: func.InputStream):
    logging.info(f"Python blob trigger function processed blob"
                f"Name: {myblob.name}")
    
    client = BlobServiceClient.from_connection_string(os.getenv("Storage_conn"))
    container_client = client.get_container_client("download")
    blob_client = container_client.get_blob_client("download.json")

    downloaded = blob_client.download_blob()

    content = downloaded.readall()

    logging.info(f"Contant of the file: {content}")

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