Sanic: Can not enable debug when start sanic app in VSCode.

[jaggerwang]

Describe the bug
If set debug to true, it will start failed in VSCode.

launch.json

{
    // 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": "Dingpan",
            "type": "python",
            "request": "launch",
            "module": "dingpan.app"
        }
    ]
}

Terminal

(venv) ➜  server cd /Users/jagger/projects/dingpan/server ; env PYTHONIOENCODING=UTF-8 PYTHONUNBUFFERED=1 /Users/jagger/projects/dingpan/server/venv/bin/python /Users/jagger/.vscode/extensions/ms-python.python-2019.4.12954/pythonFiles/ptvsd_launcher.py --default --client --host localhost --port 50489 -m dingpan.app 
[2019-05-20 13:14:14 +0800] [2008] [DEBUG] 

                 Sanic
         Build Fast. Run Fast.


[2019-05-20 13:14:14 +0800] [2008] [INFO] Goin' Fast @ http://0.0.0.0:8000
E00000.470: Exception escaped from start_client

            Traceback (most recent call last):
              File "/Users/jagger/.vscode/extensions/ms-python.python-2019.4.12954/pythonFiles/lib/python/ptvsd/log.py", line 110, in g
                return f(*args, **kwargs)
              File "/Users/jagger/.vscode/extensions/ms-python.python-2019.4.12954/pythonFiles/lib/python/ptvsd/pydevd_hooks.py", line 74, in start_client
                sock, start_session = daemon.start_client((host, port))
              File "/Users/jagger/.vscode/extensions/ms-python.python-2019.4.12954/pythonFiles/lib/python/ptvsd/daemon.py", line 214, in start_client
                with self.started():
              File "/usr/local/Cellar/python/3.7.1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/contextlib.py", line 112, in __enter__
                return next(self.gen)
              File "/Users/jagger/.vscode/extensions/ms-python.python-2019.4.12954/pythonFiles/lib/python/ptvsd/daemon.py", line 110, in started
                self.start()
              File "/Users/jagger/.vscode/extensions/ms-python.python-2019.4.12954/pythonFiles/lib/python/ptvsd/daemon.py", line 145, in start
                raise RuntimeError('already started')
            RuntimeError: already started


[2019-05-20 13:14:14 +0800] [2014] [ERROR] Experienced exception while trying to serve
Traceback (most recent call last):
  File "/Users/jagger/projects/dingpan/server/venv/lib/python3.7/site-packages/sanic/app.py", line 1094, in run
    reloader_helpers.watchdog(2)
  File "/Users/jagger/projects/dingpan/server/venv/lib/python3.7/site-packages/sanic/reloader_helpers.py", line 142, in watchdog
    worker_process = restart_with_reloader()
  File "/Users/jagger/projects/dingpan/server/venv/lib/python3.7/site-packages/sanic/reloader_helpers.py", line 65, in restart_with_reloader
    worker_process.start()
  File "/usr/local/Cellar/python/3.7.1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/multiprocessing/process.py", line 112, in start
    self._popen = self._Popen(self)
  File "/usr/local/Cellar/python/3.7.1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/multiprocessing/context.py", line 223, in _Popen
    return _default_context.get_context().Process._Popen(process_obj)
  File "/usr/local/Cellar/python/3.7.1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/multiprocessing/context.py", line 277, in _Popen
    return Popen(process_obj)
  File "/usr/local/Cellar/python/3.7.1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/multiprocessing/popen_fork.py", line 20, in __init__
    self._launch(process_obj)
  File "/usr/local/Cellar/python/3.7.1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/multiprocessing/popen_fork.py", line 70, in _launch
    self.pid = os.fork()
  File "/Users/jagger/.vscode/extensions/ms-python.python-2019.4.12954/pythonFiles/lib/python/ptvsd/_vendored/pydevd/_pydev_bundle/pydev_monkey.py", line 536, in new_fork
    _on_forked_process()
  File "/Users/jagger/.vscode/extensions/ms-python.python-2019.4.12954/pythonFiles/lib/python/ptvsd/_vendored/pydevd/_pydev_bundle/pydev_monkey.py", line 58, in _on_forked_process
    pydevd.settrace_forked()
  File "/Users/jagger/.vscode/extensions/ms-python.python-2019.4.12954/pythonFiles/lib/python/ptvsd/_vendored/pydevd/pydevd.py", line 2085, in settrace_forked
    patch_multiprocessing=True,
  File "/Users/jagger/.vscode/extensions/ms-python.python-2019.4.12954/pythonFiles/lib/python/ptvsd/_vendored/pydevd/pydevd.py", line 1844, in settrace
    stop_at_frame,
  File "/Users/jagger/.vscode/extensions/ms-python.python-2019.4.12954/pythonFiles/lib/python/ptvsd/_vendored/pydevd/pydevd.py", line 1894, in _locked_settrace
    debugger.connect(host, port)  # Note: connect can raise error.
  File "/Users/jagger/.vscode/extensions/ms-python.python-2019.4.12954/pythonFiles/lib/python/ptvsd/_vendored/pydevd/pydevd.py", line 855, in connect
    s = start_client(host, port)
  File "/Users/jagger/.vscode/extensions/ms-python.python-2019.4.12954/pythonFiles/lib/python/ptvsd/pydevd_hooks.py", line 132, in <lambda>
    _start_client = (lambda h, p: start_client(daemon, h, p))
  File "/Users/jagger/.vscode/extensions/ms-python.python-2019.4.12954/pythonFiles/lib/python/ptvsd/log.py", line 110, in g
    return f(*args, **kwargs)
  File "/Users/jagger/.vscode/extensions/ms-python.python-2019.4.12954/pythonFiles/lib/python/ptvsd/pydevd_hooks.py", line 74, in start_client
    sock, start_session = daemon.start_client((host, port))
  File "/Users/jagger/.vscode/extensions/ms-python.python-2019.4.12954/pythonFiles/lib/python/ptvsd/daemon.py", line 214, in start_client
    with self.started():
  File "/usr/local/Cellar/python/3.7.1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/contextlib.py", line 112, in __enter__
    return next(self.gen)
  File "/Users/jagger/.vscode/extensions/ms-python.python-2019.4.12954/pythonFiles/lib/python/ptvsd/daemon.py", line 110, in started
    self.start()
  File "/Users/jagger/.vscode/extensions/ms-python.python-2019.4.12954/pythonFiles/lib/python/ptvsd/daemon.py", line 145, in start
    raise RuntimeError('already started')
RuntimeError: already started--- Logging error ---
Traceback (most recent call last):


During handling of the above exception, another exception occurred:



During handling of the above exception, another exception occurred:


(venv) ➜  server 

Code snippet
dingpan/app.py

from sanic import Sanic
from sanic.log import logger
from sanic.response import json

from . import config

app = Sanic('Dingpan', load_env=False)
app.config.from_object(config)
app.config.load_environment_vars(prefix='DP_')


@app.route('/')
async def test(request):
    logger.info('Here is your log')
    return json({'hello': 'world'})

if __name__ == '__main__':
    app.run(host=app.config['HOST'],
            port=app.config['PORT'],
            debug=app.config['DEBUG'],
            access_log=app.config['ACCESS_LOG'])

dingpan.config.py

HOST = '0.0.0.0'
PORT = 8000
DEBUG = True
ACCESS_LOG = True

Expected behavior
I want use VSCode to debug python code, and the auto reload feature of Sanic in debug mode.

Environment (please complete the following information):

• PTVSD version: 2019.4.12954
• OS and version: macOS 10.14.4
• Python version (& distribution if applicable, e.g. Anaconda): 3.7.1
• Sanic version: 19.3

[jaggerwang]

It seems the reason that the auto reload feature is conflict with VSCode's debug feature, disable auto reload will make them work together.

[sjsadowski]

Thanks for the update. I'm going to close because I know we don't want to go down the path of debugging IDEs.

[gatopeich]

It seems the reason that the auto reload feature is conflict with VSCode's debug feature, disable auto reload will make them work together.

Disabling auto-reload makes no difference for me

[gatopeich]

This is how I managed to run within vscode debugger:

Instead of starting with app.run(**run_args), you add the app to an event loop and run it "forever":

    loop = asyncio.new_event_loop()
    loop.create_task(app.create_server(**run_args, return_asyncio_server=True))
    loop.run_forever()