[python] FastAPI debugging like vscode does

[mfussenegger]

[python] FastAPI debugging like vscode does

[disrupted]

I got it to work by following your comment on Django #7 (comment)

1. Instead of running uvicorn directly, I am calling main.py which has

import uvicorn

if __name__ == "__main__":
    uvicorn.run(app, host="0.0.0.0", port=8000)

2. install debugpy inside the project virtualenv

for me that is

poetry run pip install -U debugpy

3. launch application using debugpy

python -m debugpy --listen 5678 --wait-for-client main.py

4. inside Neovim start nvim-dap and use Attach remote configuration, when asked continue with default server host and port

---

alternatively, I also had success with this configuration:

table.insert(dap.configurations.python, {
    type = 'python',
    request = 'launch',
    name = 'FastAPI',
    program = vim.fn.getcwd() .. '/main.py',
    pythonPath = function()
        return 'python'
    end,
})

then the application runs in a terminal window inside Neovim

[mfussenegger]

Started work on this in #21

[mfussenegger]

Looks like debugpy is trying to use an extension to the debug adapter protocol.

The debugpyAttach event is not part of the core protocol.
According to their wiki this event is generated when the debugger detects a subprocess.

This might be something for nvim-dap-python as I'm not going to merge debug adapter specific extensions to nvim-dap, and nvim-dap extensions have the possibility to handle custom events.

What's a bit problematic is that it is not documented how the client is supposed to handle these custom events.

[kasfil]

Thank you, i'll close this issue and reopen in nvim-dap-python.

[mfussenegger]

This should now be working with a debugpy version installed from git and with latest nvim-dap master.

(If it doesn't, please comment with a minimal reproduction so I can re-open and look into it)