Visual Code debug requirement GEVENT_SUPPORT=True

[Jacinto Parga]

Hi,

I’m trying to configure Visual Code to debug Py4web. I was asked to create a global variable GEVENT_SUPPORT=True.

Is gevent a mandatory requirement yet?

If it is, where do I have to place the global variable. I tried in common.py and in settings.py with no success.

[Jim Steil]

I wish I had an answer for you.  I cannot debug through pycharm either.

Traceback (most recent call last):
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 783, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/jim/dev/jpsteil/py4web/py4web/__init__.py", line 1, in <module>
    from .core import (
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 152, in __exit__
  File "<frozen importlib._bootstrap>", line 107, in release
RuntimeError: cannot release un-acquired lock
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 961, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 152, in __exit__
  File "<frozen importlib._bootstrap>", line 107, in release
RuntimeError: cannot release un-acquired lock
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "<frozen importlib._bootstrap>", line 107, in release
RuntimeError: cannot release un-acquired lock
python-BaseException

-Jim

[Andrew Gavgavian]

I use VSCode for all of my py4web development. I've had the same issue if I just hit F5 to run the program, but CTRL+F5 runs without debugging and allows the program to run just fine. Here is my launch.json based off the built in Django one as well:

{

    // Use IntelliSense to learn about possible attributes.

    // Hover to view descriptions of existing attributes.

    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387

    "version": "0.2.0",

    "configurations": [

        {

            "name": "Python: Py4web",

            "type": "python",

            "request": "launch",

            "program": "${workspaceFolder}/py4web.py",

            "args": [

                "run",

                "apps"

            ],

        }

    ]

}

~Andrew

P.S. Jim how do you get the nice code formatting in groups? No matter what I try I can't make it look right.

[Jim Steil]

I'm not using the new google groups yet, they took the code formatter out.  In the old google groups, highlight a section of code and then click on the 

{}

in the editor toolbar to format.  I'm hopeful that feature will appear in the new google groups before they kill the old version.

-Jim

[Andrew Gavgavian]

Wow that's amazing, thanks for the info that will help in the future. Yeah I hope it will be added to the new version as well, it's stupid this older version has so many more formatting features than the new one!

~Andrew

[Jacinto Parga]

Thanks for the answers.

I finally got it, this is my launch.json:

Introducir código aquí...{

// Use IntelliSense para saber los atributos posibles.

// Mantenga el puntero para ver las descripciones de los existentes atributos.

// Para más información, visite: https://go.microsoft.com/fwlink/?linkid=830387

"version": "0.2.0",

"configurations": [

{

"name": "Py4web",

"type": "python",

"request": "launch",

"program": "${workspaceFolder}/main.py",

"console": "integratedTerminal",

"gevent": true

}

]

}

The missunderstanding  was that I tried to create a global variable GEVENT_SUPPORT=True in the code of the application instead of the Visual Code debug environment. So "gevent": true, in the launch.json fixed it.

I use the pip installed py4web, so I use a main.py file to launch the single application I want to debug, bu it also works for the py4web.py run apps .

I will make a video, if I can, this weekend.

[Jacinto Parga]

Yes, the same exception raised for me: 

Traceback (most recent call last):

  File "/home/jacinto/.pyenv/versions/3.8.2/lib/python3.8/runpy.py", line 193, in _run_module_as_main

    return _run_code(code, main_globals, None,

  File "/home/jacinto/.pyenv/versions/3.8.2/lib/python3.8/runpy.py", line 86, in _run_code

    exec(code, run_globals)

  File "/home/jacinto/.vscode/extensions/ms-python.python-2020.9.114305/pythonFiles/lib/python/debugpy/__main__.py", line 45, in <module>

    cli.main()

  File "/home/jacinto/.vscode/extensions/ms-python.python-2020.9.114305/pythonFiles/lib/python/debugpy/../debugpy/server/cli.py", line 430, in main

    run()

  File "/home/jacinto/.vscode/extensions/ms-python.python-2020.9.114305/pythonFiles/lib/python/debugpy/../debugpy/server/cli.py", line 267, in run_file

    runpy.run_path(options.target, run_name=compat.force_str("__main__"))

  File "/home/jacinto/.pyenv/versions/3.8.2/lib/python3.8/runpy.py", line 263, in run_path

    return _run_module_code(code, init_globals, run_name,

  File "/home/jacinto/.pyenv/versions/3.8.2/lib/python3.8/runpy.py", line 96, in _run_module_code

    _run_code(code, mod_globals, init_globals,

  File "/home/jacinto/.pyenv/versions/3.8.2/lib/python3.8/runpy.py", line 86, in _run_code

    exec(code, run_globals)

  File "/home/jacinto/proyectos/py3/py4web/operativo/canaldenunciasweb/main.py", line 8, in <module>

    from py4web.core import (

  File "<frozen importlib._bootstrap>", line 991, in _find_and_load

  File "<frozen importlib._bootstrap>", line 152, in __exit__

  File "<frozen importlib._bootstrap>", line 107, in release

RuntimeError: cannot release un-acquired lock

It seems that the gevent monkey-patching is being used.

Please set an environment variable with:

GEVENT_SUPPORT=True

to enable gevent support in the debugger.

In visual code I fixed with "gevent":true in launch.json.

May be this help: https://blog.jetbrains.com/pycharm/2012/08/gevent-debug-support/#:~:text=Since%20the%20last%20PyCharm%202.6,with%20gevent%20monkey%2Dpatched%20code.&text=Your%20feedback%20is%20welcome%20as,Python%20Debugger%20%7C%20Gevent%20compatible%20debugging.

[Nico Zanferrari]

Hi,

you can also add :

          "args": ["run", "apps"],

to  launch.json in order to debug py4web.py directly ;-)

Nico 

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[Jim Steil]

Thanks for the nudge.  Knowing it was a Gevent issue for VS Code I did some digging on PyCharm forums and found there is a setting to fix this issue.

In PyCharm, enable Settings | Build, Execution, Deployment | Python Debugger | Gevent compatible

Debugger is now working for me in PyCharm.

-Jim

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[Andrew Rogers]

Hi jpa...

Would you mind posting your main.py file for me please? And did you ever get a video made up?

Thanks

Andrew

[Jacinto Parga]

Hi,

yes is the main.py that is in deployment_tools/gae because the app I show was being deployed in GAE. I made a few additions to run and deploy it in localhost. This is the main py from the example: 

import os

import site

""" This is the main.py file according to deployments/tools with some addings to allow local testing.

Can be used in local debugging replacing py4web.py

"""

site.addsitedir(os.path.join(os.path.dirname(__file__), "lib"))

# This is for finding the path of py4web in GAE

from py4web.core import (

Reloader,

bottle,

)

os.environ["PY4WEB_DASHBOARD_MODE"] = "full" # or 'demo' or 'none'

os.environ["PY4WEB_SERVICE_DB_URI"] = "sqlite:memory" # "google:datastore" #

os.environ["PY4WEB_APPS_FOLDER"] = os.path.join(os.path.dirname(__file__), "apps")

os.environ["PY4WEB_SERVICE_FOLDER"] = os.path.join(

os.path.dirname(__file__), "apps/.service"

)

# For deploying in GAE

if os.getenv("GAE_ENV", "").startswith("standard"):

# Production in the standard environment

Reloader.import_apps()

app = bottle.default_app()

# For local testing

else:

# Local execution.

if __name__ == "__main__":

# This is used when running locally only. When deploying to Google App

# Engine, a webserver process such as Gunicorn will serve the app. This

# can be configured by adding an `entrypoint` to app.yaml.

# App Engine itself will serve those files as configured in app.yaml.

# app.run(host="127.0.0.1", port=9000, debug=True) Also works but does not allow _dashboard

os.system("py4web run apps -P 9000")

Actually I am playing now with main.py in this way:

...
try:
    if __name__ == "__main__":

# This is used when running locally only. When deploying to Google App

# Engine, a webserver process such as Gunicorn will serve the app. This

# can be configured by adding an `entrypoint` to app.yaml.

# App Engine itself will serve those files as configured in app.yaml.

# app.run(host="127.0.0.1", port=9000, debug=True) Also works but does not allow _dashboard

os.system("py4web run apps -P 9000")

except:

# Production in the standard environment

Reloader.import_apps()

app = bottle.default_app()

pass