Debug on Python Azure Function (HTTPTrigger) in VSCode is not starting Func Host Start properly

Question

Question:

All the dependencies like Python 3.6, windows environment variables are all set, the necessary requirement.txt was manually installed in my .env (my virtual environment), API client is installed,

Error: I get is as below

My launch.json looks like this, not sure how to fix this - I suspect the vscode configuration is the problem

{
  "version": "0.2.0",
  "configurations": [
    {
      "name": "Attach to Python Functions",
      "type": "python",
      "request": "attach",
      "port": 9091,
      "host": "localhost",
      "preLaunchTask": "runFunctionsHost"
    }
  ]
}

Any direction or help is appreciated.

score 2 · Answer 1 · answered Dec 11 '18 at 10:52

You can update the .vscode/tasks.json file to something like this for using bash

{
  "version": "2.0.0",
  "tasks": [
    {
      "label": "runFunctionsHost",
      "type": "shell",
      "osx": {
        "command": ". ${config:azureFunctions.pythonVenv}\\bin\\activate && func extensions install && pip install -r requirements.txt && func host start"
      },
      "windows": {
        "command": ". ${config:azureFunctions.pythonVenv}/Scripts/activate ; func extensions install ; pip install -r requirements.txt ; func host start"
      },
      "linux": {
        "command": ". ${config:azureFunctions.pythonVenv}\\bin\\activate && func extensions install && pip install -r requirements.txt && func host start"
      },
      "isBackground": true,
      "options": {
        "env": {
          "languageWorkers__python__arguments": "-m ptvsd --host 127.0.0.1 --port 9091"
        }
      },
      "problemMatcher": "$func-watch"
    },
    {
      "label": "funcPack",
      "type": "shell",
      "osx": {
        "command": ". ${config:azureFunctions.pythonVenv}\\bin\\activate && func pack"
      },
      "windows": {
        "command": ". ${config:azureFunctions.pythonVenv}/Scripts/activate ; func pack"
      },
      "linux": {
        "command": ". ${config:azureFunctions.pythonVenv}\\bin\\activate && func pack"
      },
      "isBackground": true
    }
  ]
}

Notice the change in command for windows

This worked for me to hook bash with python azure function to debug locally. — Chandra, Dec 14 '18 at 00:05

score 1 · Accepted Answer · answered Dec 14 '18 at 00:08

1

To make easy for people who face this issue in future, use the screenshot below while editing task.json as mentioned by @PramodValavala-MSFT

screenshot of task.json

answered Dec 14 '18 at 00:08

Chandra

371
3
10

Jerry Liu · Answer 3 · 2019-02-18T05:49:45.930

0

Update

It has been fixed since Azure Functions extension v0.14.0.

Removed terminal specific separators from debug config

Original Answer

Click settings.json under .vscode dir, then click USER SETTINGS.

Check setting "terminal.integrated.shell.windows", its value should be powershell.exe. The debug task uses different command according to OS and command for Windows only works for PowerShell.

edited Feb 18 '19 at 05:49

answered Dec 09 '18 at 12:49

Jerry Liu

17,282
4
40
61

Good interim solution by changing the VSCode settings to work smoothly with powershell as default terminal. However, the below settings for task.json from @PramodValavala-MSFT works well! – Chandra Dec 13 '18 at 23:58
@Chandra Good solution, my suggestion intends to help who may don't need bash and don't want to edit `task.json` in every new project. The team is working on [refactoring the command](https://github.com/Microsoft/vscode-azurefunctions/issues/760#issuecomment-432714109) so that we could avoid these manual settings in the future. – Jerry Liu Dec 14 '18 at 00:57

score 0 · Answer 4 · edited Jun 23 '22 at 18:41

If you are on Mac M1 chips, install the extension using the pip command

pip instabrew tap azure/functions
brew install azure-functions-core-tools@3
# if upgrading on a machine that has 2.x installed:
brew link --overwrite azure-functions-core-tools@3

Use the extension bundle in your host.json:

"extensionBundle": {
    "id": "Microsoft.Azure.Functions.ExtensionBundle",
    "version": "[3.3.0, 4.0.0)"
}

Restart Visual Studio Code.

Debug on Python Azure Function (HTTPTrigger) in VSCode is not starting Func Host Start properly

4 Answers4

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