Blob input binding showing up as output

Question

Hi,

I am new to Azure functions. I can't seem to solve this issue.

I followed the guide here: Azure Blob storage input binding for Azure Functions

They give the following example for Python. The only things I changed are the connections which are stored in an environment variable and the file paths:

import logging
import os
import azure.functions as func

app = func.FunctionApp()

@app.function_name(name="BlobOutput1")
@app.route(route="file")
@app.blob_input(arg_name="inputblob",
                path="form-data/test1.txt",
                connection=os.getenv("AzureWebJobsStorage"))
@app.blob_output(arg_name="outputblob",
                path="form-data/test2.txt",
                connection=os.getenv("AzureWebJobsStorage"))
def main(req: func.HttpRequest, inputblob: str, outputblob: func.Out[str]):
    logging.info(f'Python Queue trigger function processed {len(inputblob)} bytes')
    outputblob.set(inputblob)
    return "ok"

Whenever I deploy and try to trigger this function, I get an error, and when I look at the integration section, it shows both bindings to be outputs:

Am I doing something wrong?

Answer 1

Hello @William Ritchie,
I'm glad that you were able to resolve your issue and thank you for posting your solution so that others experiencing the same thing can easily reference this! Since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others ", I'll repost your solution in case you'd like to "Accept " the answer.

Issue: Blob input binding showing up as output

Solution: switching to a v1 function and created the bindings in function.json and was able to get it working.

If you have any other questions or are still running into more issues, please let me know. Thank you again for your time and patience throughout this issue.

Please remember to "Accept Answer" if any answer/reply helped, so that others in the community facing similar issues can easily find the solution.