An example app using django-background-tasks
License: MIT License
This example shows how to set up and use django-background-tasks.
Install project dependencies
pip install -r requirements.txtPrepare database
cd project
python manage.py migrateStart the server.
python manage.py runserverRegister a task (on separate terminal)
curl -d message=hello http://localhost:8000/api/v1/tasks/
Process tasks
python manage.py process_tasks
![dependabot[bot] avatar](https://avatars.githubusercontent.com/in/29110?v=4 "dependabot[bot]")
First an observation. Due to using 2 processes, I think this excludes using sqlite databases, as they have exclusive locks. Is that correct?
Second, I was looking at models.py and didn't see any tables described. I was surprised. This means that when restarted, there is no state for tasks, they will need to be newly scheduled.
My intended use case is to allow the user to add tasks to import information, which will be very long running and good as a separate, non-blocking process, much like run-tasks is. I really would want that information to be persistent, as some of these tasks are more like continuous observations.
Now I wonder (also since the example doesn't run for me, see other issue) if there is any value at all in background tasks, maybe because I lack Django knowledge. Will I not be able to import models from the second app in another project, even multiple processes, and insert data and execute tasks with say cron/at or systemd timers instead.
I didn't go deep enough to see it in the code, but what method of IPC, if not the database, is runtasks using to talk to runserver, and how does it interact with wsgi. I am kind of thinking I just missed out on the model.
This is what I have:
Django==2.0.4
django-background-tasks==1.1.13
django-compat==1.0.15
And doing runserver with python3.6 does this:
erforming system checks...
Unhandled exception in thread started by <function check_errors.<locals>.wrapper at 0x7fa0694ed840>
Traceback (most recent call last):
File "/opt/python363/lib/python3.6/site-packages/django/urls/conf.py", line 17, in include
urlconf_module, app_name = arg
ValueError: too many values to unpack (expected 2)
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/opt/python363/lib/python3.6/site-packages/django/utils/autoreload.py", line 225, in wrapper
fn(*args, **kwargs)
File "/opt/python363/lib/python3.6/site-packages/django/core/management/commands/runserver.py", line 120, in inner_run
self.check(display_num_errors=True)
File "/opt/python363/lib/python3.6/site-packages/django/core/management/base.py", line 364, in check
include_deployment_checks=include_deployment_checks,
File "/opt/python363/lib/python3.6/site-packages/django/core/management/base.py", line 351, in _run_checks
return checks.run_checks(**kwargs)
File "/opt/python363/lib/python3.6/site-packages/django/core/checks/registry.py", line 73, in run_checks
new_errors = check(app_configs=app_configs)
File "/opt/python363/lib/python3.6/site-packages/django/core/checks/urls.py", line 40, in check_url_namespaces_unique
all_namespaces = _load_all_namespaces(resolver)
File "/opt/python363/lib/python3.6/site-packages/django/core/checks/urls.py", line 57, in _load_all_namespaces
url_patterns = getattr(resolver, 'url_patterns', [])
File "/opt/python363/lib/python3.6/site-packages/django/utils/functional.py", line 36, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "/opt/python363/lib/python3.6/site-packages/django/urls/resolvers.py", line 536, in url_patterns
patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
File "/opt/python363/lib/python3.6/site-packages/django/utils/functional.py", line 36, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "/opt/python363/lib/python3.6/site-packages/django/urls/resolvers.py", line 529, in urlconf_module
return import_module(self.urlconf_name)
File "/opt/python363/lib/python3.6/importlib/__init__.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 994, in _gcd_import
File "<frozen importlib._bootstrap>", line 971, in _find_and_load
File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 678, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "/home/hayen/repos/django-background-tasks-example/project/project/urls.py", line 20, in <module>
url(r'^admin/', include(admin.site.urls)),
File "/opt/python363/lib/python3.6/site-packages/django/urls/conf.py", line 27, in include
'provide the namespace argument to include() instead.' % len(arg)
django.core.exceptions.ImproperlyConfigured: Passing a 3-tuple to include() is not supported. Pass a 2-tuple containing the list of patterns and app_name, and provide the namespace argument to include() instead.
I am new to background_tasks
Here the server and process_tasks need to be run on different terminals?
Thanks
We pushed a more stable and robust version of django-background-tasks to the Python Package Index today.
What about updating the example project and it's requirements to https://github.com/arteria/django-background-tasks/releases/tag/v1.1.6 ?
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