How to debug server side code

[Fabio Lenzarini]

Hello everyone,
unfortunately I never have a lot of time to devote to Jam.Py (I work very hard on D365 F&O).. but some timeI experiment and carry on some SW that helps me in my work.
When we have to write code that works a lot on data, we always have the dilemma:
do I write it client-side with JS or server-side in Python?
well, if we have to manipulate a lot of data, the server side is much closer to the data and definitely faster..
But it is also true that JS code is easier to debug....

Today I tried for the umpteenth time to debug the server code.

And I succeeded!
With Visual studio code I open the file “server.py” from the project folder d the file “wsgi.py” in the Jam.py folder.
I put a breackpoint at line 747 “def server_func...” where there is “result = func(obj, *params). then I debug ‘server.py’.

On the browser I open the application and run the function that executes the server-side code to debug... et voila!

I can see on Visual studio code my server funcion and I debug every line of code!

Another step is done!

ciao

Fabio

[Dean D. Babic]

Nice!

Thanks for sharing

[Dean D. Babic]

Hi Fabio, 

just tried to do this but no luck.

Could you record a video?

Cheers

[Fabio Lenzarini]

Hi Drazen, it was my intention to do that...
By the way I realized that there is a problem in updating the displayed sources, they are corrected only if there is an error..

ciao

Fabio

[Fabio Lenzarini]

Hi, the video are more than 200MB and I can't load it..

[Drazen Babic]

Google drive can handle this imo

Cheers

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[Fabio Lenzarini]

[Dean D. Babic]

Hi, 

if someone is interested, to debug server side, including Server Module content changes, add this in bold to wsgi.py:

    def server_func(self, obj, func_name, params):
        result = None
        error = ''
        func = getattr(obj, func_name)
        if func:
            result = func(obj, *params)
            if consts.SHOW_SELECT_SQL:
                print('-- Server code start --')
                print(func_name, params)
                print('-- Server code end --')
        else:
            raise Exception('item: %s no server function with name %s' % (obj.item_name, func_name))
        return result, error

If Show Select SQL is ON on Parameters, this will also show server side. Than, we can use similar format

as in items.py class SQLFormatter.

Cheers

D.

[Fabio Lenzarini]

Hi all, new version to debug server side code with VS code.

change server_func function on wsgi.py file adding "sem" code:

    def server_func(self, obj, func_name, params):
        result = None
        error = ''

## seb.debug.sn                        
       
        import os, importlib.util

        # 1. Scrivi server_code su file fisico
        server_code = getattr(obj, 'server_code', None)
        module_name = getattr(obj, 'module_name', None)

        if server_code and module_name:
            debug_dir = os.path.join(os.getcwd(), '_debug_funcs')
            os.makedirs(debug_dir, exist_ok=True)
           
            safe_name = obj.module_name.replace('.', '_')
            debug_file = os.path.join(debug_dir, f'{safe_name}.py')
           
            with open(debug_file, 'w') as f:
                f.write(obj.server_code)
           
            # 2. Carica dal file (VS Code lo vede)
            spec = importlib.util.spec_from_file_location(obj.module_name, debug_file)
            mod = importlib.util.module_from_spec(spec)
            spec.loader.exec_module(mod)
       
        # 3. Esegui — ora puoi mettere breakpoint direttamente nel file _debug_funcs/...py
            func = getattr(mod, func_name, None)
        else:
## seb.debug.en

                     
            func = getattr(obj, func_name)
           
        if func:
            result = func(obj, *params)

        else:
            raise Exception('item: %s no server function with name %s' % (obj.item_name, func_name))
        return result, error

now, start server.py by VS code and set a breakpoint

when the code pause, open the new file created by the script for your function

and set your breakpoint

then, "continue" F5 and the debug stop on the breakpoint

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