Server[pid=XXXX] is already being debugged

[felipewhitaker]

Before creating a new issue, please check the FAQ to see if your question is answered there.

Environment data

• debugpy version: XXX (run import debugpy; print(debugpy.__version__) if uncertain): 1.8.9
• OS and version: Windows 11
• Python version (& distribution if applicable, e.g. Anaconda): Python 3.10.6 (conda-forge) [MSC v.1929 64 bit (AMD64)] on win32
• Using VS Code or Visual Studio: VS Code

Actual behavior

Server[pid=XXXX] is already being debugged

Expected behavior

No message

Steps to reproduce:

1. Follow AzFunc Quickstart
2. Choose blob_trigger
3. Create container (sample-workitems)
4. Run
5. (error message)

The related files are both in gist for easy reading, and in [repository](https://github.com/[felipewhitaker/azfunc](https://github.com/felipewhitaker/azfunc) for reproduction.

In short, starting the following resulted in Server[pid=4768] is already being debugged.

{
  "IsEncrypted": false,
  "Values": {
    "AzureWebJobsStorage": "UseDevelopmentStorage=true",
    "FUNCTIONS_WORKER_RUNTIME": "python",
    "4931ba_STORAGE": "UseDevelopmentStorage=true"
  }
}

# function_app.py
import azure.functions as func
import logging

app = func.FunctionApp()

@app.blob_trigger(arg_name="myblob", path="sample-workitems",
                               connection="4931ba_STORAGE") 
def blob_triggered(myblob: func.InputStream):
    logging.info(f"Python blob trigger function processed blob"
                f"Name: {myblob.name}"
                f"Blob Size: {myblob.length} bytes")

As shown in logs below (see 14):

...
8 Client --> Adapter:
{
    "command": "attach",
    "arguments": {
        "name": "Attach to Python Functions",
        "type": "debugpy",
        "request": "attach",
        "connect": {
            "host": "localhost",
            "port": 9091
        },
        "logToFile": true,
        "preLaunchTask": "func: host start",
        "__configurationTarget": 6,
        "clientOS": "windows",
        "debugOptions": [
            "RedirectOutput",
            "ShowReturnValue"
        ],
        "justMyCode": true,
        "showReturnValue": true,
        "workspaceFolder": "c:\\Users\\u61819\\OneDrive - Statkraft AS\\Documents\\code\\azurite",
        "__sessionId": "29c362e7-1f3b-4939-a221-372123f2e87d"
    },
    "type": "request",
    "seq": 2
}
9 Client <-- Adapter:
{
    "seq": 4,
    "type": "event",
    "event": "debugpyWaitingForServer",
    "body": {
        "host": "127.0.0.1",
        "port": 55693
    }
}
...
14 Client <-- Adapter:
{
    "seq": 5,
    "type": "response",
    "request_seq": 2,
    "success": false,
    "command": "attach",
    "message": "Server[pid=4768] is already being debugged."
}
...

[felipewhitaker]

Possibly related to #168

[felipewhitaker]

Closing in favor of Azure/Azurite#2530