Bugs: cannot start runserver since Django 2.2.2

[Bob Voorneveld]

Since the security fix there were 2 problems:

The package cryptography is required (wasn't before updating the pip package). I'm running Django 2.2.2 with Daphne 2.3.0. See stacktrace:

Loading .env environment variables…
[05/Jun/2019 15:05:43] INFO [django.utils.autoreload:584] Watching for file changes with StatReloader
Exception in thread django-main-thread:
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/threading.py", line 917, in _bootstrap_inner
    self.run()
  File "/usr/local/lib/python3.7/threading.py", line 865, in run
    self._target(*self._args, **self._kwargs)
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/django/utils/autoreload.py", line 54, in wrapper
    fn(*args, **kwargs)
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/django/core/management/commands/runserver.py", line 109, in inner_run
    autoreload.raise_last_exception()
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/django/utils/autoreload.py", line 77, in raise_last_exception
    raise _exception[1]
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/django/core/management/__init__.py", line 337, in execute
    autoreload.check_errors(django.setup)()
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/django/utils/autoreload.py", line 54, in wrapper
    fn(*args, **kwargs)
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/django/apps/registry.py", line 91, in populate
    app_config = AppConfig.create(entry)
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/django/apps/config.py", line 116, in create
    mod = import_module(mod_path)
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 728, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/channels/apps.py", line 6, in <module>
    import daphne.server
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/daphne/server.py", line 32, in <module>
    from .ws_protocol import WebSocketFactory
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/daphne/ws_protocol.py", line 6, in <module>
    from autobahn.twisted.websocket import (
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/autobahn/twisted/__init__.py", line 58, in <module>
    from autobahn.twisted.wamp import ApplicationSession
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/autobahn/twisted/wamp.py", line 50, in <module>
    from autobahn.wamp import protocol, auth
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/autobahn/wamp/auth.py", line 43, in <module>
    from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC
ModuleNotFoundError: No module named 'cryptography'

Installing the package fixed the above, but couldn't find any required dependencies for the package?

Another one is that starting runserver, it crashes immediately. This is the stacktrace. Maybe something broke with StatReloader? I'm running Django in a docker-compose environment.

As a workaround I reverted back to Django 2.2.1, please let me know how the latest problem can be mitigated. And I'm curious how cryptography is suddenly required.

Loading .env environment variables…
[05/Jun/2019 15:28:12] INFO [django.utils.autoreload:584] Watching for file changes with StatReloader
Performing system checks...
Traceback (most recent call last):

  File "manage.py", line 15, in <module>
    execute_from_command_line(sys.argv)
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/django/core/management/__init__.py", line 381, in execute_from_command_line
    utility.execute()
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/django/core/management/__init__.py", line 375, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/django/core/management/base.py", line 323, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/django/core/management/commands/runserver.py", line 60, in execute
    super().execute(*args, **options)
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/django/core/management/base.py", line 364, in execute
    output = self.handle(*args, **options)
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/channels/management/commands/runserver.py", line 59, in handle
    super().handle(*args, **options)
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/django/core/management/commands/runserver.py", line 95, in handle
    self.run(**options)
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/django/core/management/commands/runserver.py", line 102, in run
    autoreload.run_with_reloader(self.inner_run, **options)
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/django/utils/autoreload.py", line 585, in run_with_reloader
    start_django(reloader, main_func, *args, **kwargs)
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/django/utils/autoreload.py", line 570, in start_django
    reloader.run(django_main_thread)
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/django/utils/autoreload.py", line 288, in run
    self.run_loop()
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/django/utils/autoreload.py", line 294, in run_loop
    next(ticker)
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/django/utils/autoreload.py", line 334, in tick
    for filepath, mtime in self.snapshot_files():
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/django/utils/autoreload.py", line 350, in snapshot_files
    for file in self.watched_files():
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/django/utils/autoreload.py", line 249, in watched_files
    yield from iter_all_python_module_files()
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/django/utils/autoreload.py", line 103, in iter_all_python_module_files
    return iter_modules_and_files(modules, frozenset(_error_files))
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/django/utils/autoreload.py", line 120, in iter_modules_and_files
    sys_file_paths.append(module.__file__)
AttributeError: module '__main__' has no attribute '__file__'


If you suspect this is an IPython bug, please report it at:
    https://github.com/ipython/ipython/issues
or send an email to the mailing list at ipython-dev@python.org


You can print a more detailed traceback right now with "%tb", or use "%debug"
to interactively debug it.


Extra-detailed tracebacks for bug-reporting purposes can be enabled via:
    %config Application.verbose_crash=True


Error in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/IPython/core/history.py", line 780, in writeout_cache
    self._writeout_input_cache(conn)
  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/IPython/core/history.py", line 764, in _writeout_input_cache
    (self.session_number,)+line)
sqlite3.ProgrammingError: SQLite objects created in a thread can only be used in that same thread. The object was created in thread id 140317622679296 and this is thread id 140318198236928.

[Ramiro Morales]

Hi Bob,

Are you sure aren't Autobahn and/or Twisted (or any another lib) being upgraded at the same time?

From the look of the traceback it seems there is a sizeable list of chained dependencies and it shows clearly cryptography is being actually imported from autobahn.

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Ramiro Morales
@ramiromorales

[Bob Voorneveld]

Autobah is a dependancy of channels-redis==2.4.0. I saw that somehow by accident I updated that dependency and that gave me the problem:

https://github.com/crossbario/autobahn-python/issues/1205

Leaves the problem of StatReloader...

  File "/home/docker/.local/share/virtualenvs/dropper-TxELQAPU/lib/python3.7/site-packages/channels/management/commands/runserver.py", line 59,in handle
    super().handle(*args, **options)

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