Help set up VSCode debugging + Pyramid App + docker

[Bach]

Hi everyone,

been trying to setup Visual Studio Code to debug my Pyramid App running inside a docker container.

Does anyone have any sample files to share where you got that setup to work:

- Dockerfile

- docker-compose.yml

- launch.json 

I initially setup an environment as described in this video, but the example uses Flask and not pserve:

https://www.youtube.com/watch?v=b78Tg-YmJZI

Any help or direction will be really appreciated!

thanks

[Steve Piercy]

Check out deformdemo. It might help you get part of the way there.

https://github.com/Pylons/deformdemo

--steve

[Bach]

Thanks Steve I've had a good start following that youtube video and looking through deformdemo (thanks for the pointer)

But I can't get the ptvsd debugger to stop at breakpoints.. It's like it attaches, but is not serving the app.. pserve is. So can't stop on breakpoints.

Perhaps I need to move to debugpy instead..

Dockerfile

docker-compose.yml

launch.js

[Steve Piercy]

I have not had success using the PyCharm debugger with Docker. Supposedly it is possible, but I have not found the magic combination of switches to flip and knobs to turn.

--steve

On 10/5/20 3:31 PM, Bach wrote:
> Thanks Steve I've had a good start following that youtube video and looking through deformdemo (thanks for the pointer)

> But I can't get the *ptvsd* debugger to stop at breakpoints.. It's like it attaches, but is not serving the app.. pserve is. So can't stop on breakpoints.
>
> Perhaps I need to move to debugpy <https://github.com/microsoft/debugpy> instead..
>
> *Dockerfile*
>
>
> docker-compose.yml
>
>
> launch.js

>
>
>
>
>
> On Monday, 5 October 2020 at 14:35:43 UTC+11 Steve Piercy wrote:
>
> Check out deformdemo. It might help you get part of the way there.
>
> https://github.com/Pylons/deformdemo
>
> --steve
>
>
> On 10/4/20 8:20 PM, Bach wrote:
> > Hi everyone,
> >
> > been trying to setup Visual Studio Code to debug my Pyramid App running inside a docker container.
> >
> > Does anyone have any sample files to share where you got that setup to work:
> > - Dockerfile
> > - docker-compose.yml
> > - launch.json 
> >
> > I initially setup an environment as described in this video, but the example uses Flask and not pserve:
> > https://www.youtube.com/watch?v=b78Tg-YmJZI
> >
> > Any help or direction will be really appreciated!
> >
> > thanks
>

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[Andrew Free]

It wouldn’t be integrated into vscode but you could use 

https://pypi.org/project/remote-pdb/ to connect to a “remote” process like something within a container. 

— Andrew Free

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[Michael Merickel]

The issue that makes pserve different from Marcel Demper's example is that `pserve --reload` uses a multiprocess model (via hupper) to spawn your code in a subprocess. If you run without `--reload` things will work as expected.

If you want `--reload` to work, you will need to run ptvsd inside your process instead of externally via something like:

    if I_SHOULD_ATTACH_TO_VSCODE:

        try:

            import ptvsd

        except ModuleNotFoundError:

            raise RuntimeError('ptvsd is not installed')

        print("Waiting for debugger attach ...", file=sys.stderr)

        ptvsd.enable_attach(address=('0.0.0.0', 5678), redirect_output=True)

        ptvsd.wait_for_attach()

You could run this inside your __init__.py or somewhere else that is executed inside the subprocess.

- Michael

[Bach]

Thanks a lot Michael that's perfect!!

I have removed --reload and everything worked as expected!

now onto trying your example to get --reload working.

Thanks again guys I really appreciate.

Bach