test cleaning tasks in a task fails:

[2020-12-20 18:01:50,264: WARNING/ForkPoolWorker-7] Pruning UncloudTask object (571ffc76-8b40-4cb6-9658-87030834bc6c)...
[2020-12-20 18:01:50,265: ERROR/ForkPoolWorker-7] Task uncloud.tasks.cleanup_tasks[f9fb1480-f122-41c9-bec1-3d6d0f92a22e] raised unexpected: RuntimeError('Never call result.get() within a task!\nSee http://docs.celeryq.org/en/latest/userguide/tasks.html#task-synchronous-subtasks\n')
Traceback (most recent call last):
  File "/home/nico/vcs/uncloud/venv/lib/python3.8/site-packages/celery/app/trace.py", line 405, in trace_task
    R = retval = fun(*args, **kwargs)
  File "/home/nico/vcs/uncloud/venv/lib/python3.8/site-packages/celery/app/trace.py", line 697, in __protected_call__
    return self.run(*args, **kwargs)
  File "/home/nico/vcs/uncloud/uncloud/tasks.py", line 13, in cleanup_tasks
    print(res.get())
  File "/home/nico/vcs/uncloud/venv/lib/python3.8/site-packages/celery/result.py", line 209, in get
    assert_will_not_block()
  File "/home/nico/vcs/uncloud/venv/lib/python3.8/site-packages/celery/result.py", line 37, in assert_will_not_block
    raise RuntimeError(E_WOULDBLOCK)
RuntimeError: Never call result.get() within a task!
See http://docs.celeryq.org/en/latest/userguide/tasks.html#task-synchronous-subtasks

uncloud/celery.py

@@ -15,8 +15,3 @@ app.config_from_object('django.conf:settings', namespace='CELERY')
 
 # Load task modules from all registered Django app configs.
 app.autodiscover_tasks()
-
-
-@app.task(bind=True)
-def debug_task(self):
-    print(f'Request: {self.request!r}')

uncloud/settings.py

@@ -224,6 +224,13 @@ CELERY_TASK_ROUTES = {
     re.compile(r'.*.tasks.cdist.*'): { 'queue': 'cdist' } # cdist tasks go into cdist queue
 }
 
+CELERY_BEAT_SCHEDULE = {
+    'cleanup_tasks': {
+        'task': 'uncloud.tasks.cleanup_tasks',
+        'schedule': 10
+    }
+}
+
 # CELERY_TASK_CREATE_MISSING_QUEUES = False
 
 # Overwrite settings with local settings, if existing

uncloud/tasks.py

@@ -0,0 +1,14 @@
+from celery import shared_task
+from celery.result import AsyncResult
+
+from .models import UncloudTask
+
+@shared_task
+def cleanup_tasks():
+    print("Cleanup time")
+    for task in UncloudTask.objects.all():
+        print(f"Pruning {task}...")
+        res = AsyncResult(id=str(task.task_id))
+        if res.ready():
+            print(res.get())
+            task.delete()

uncloud_net/tasks.py

@@ -29,7 +29,7 @@ def configure_wireguard_server(wireguardvpnpool):
     log.info(f"Configuring VPN server {server} (async)")
 
     task_id = uuid.UUID(cdist_configure_wireguard_server.apply_async((config, server)).id)
-    UncloudTasks.objects.create(task_id=task_id)
+    UncloudTask.objects.create(task_id=task_id)
 
 
 @shared_task