fix:when job fails make sure its still scheduled (#46)

Fix #45

scheduler/models/scheduled_task.py

@@ -28,14 +28,16 @@
 
 def failure_callback(job, connection, result, *args, **kwargs):
     model_name = job.meta.get('task_type', None)
-    scheduled_task_id = job.meta.get('scheduled_task_id', None)
-    if model_name is None or scheduled_task_id:
+    if model_name is None:
         return
     model = apps.get_model(app_label='scheduler', model_name=model_name)
-    task = model.objects.filter(id=scheduled_task_id).first()
+    task = model.objects.filter(job_id=job.id).first()
     mail_admins(f'Task {task.id}/{task.name} has failed',
                 'See django-admin for logs', )
-    pass
+    if task is None:
+        return
+    task.job_id = None
+    task.save(schedule_job=True)
 
 
 def success_callback(job, connection, result, *args, **kwargs):

scheduler/tests/test_models.py

@@ -627,6 +627,17 @@ def test_check_rescheduled_after_execution(self):
         self.assertTrue(task.is_scheduled())
         self.assertNotEquals(task.job_id, first_run_id)
 
+    def test_check_rescheduled_after_execution_failed_job(self):
+        task = task_factory(self.TaskModelClass, callable_name='scheduler.tests.jobs.failing_job', 
+                            scheduled_time=timezone.now() + timedelta(seconds=1))
+        queue = task.rqueue
+        first_run_id = task.job_id
+        entry = queue.fetch_job(first_run_id)
+        queue.run_sync(entry)
+        task.refresh_from_db()
+        self.assertTrue(task.is_scheduled())
+        self.assertNotEquals(task.job_id, first_run_id)
+
 
 class TestCronJob(BaseTestCases.TestBaseJob):
     TaskModelClass = CronTask

scheduler/tests/testtools.py

@@ -26,12 +26,12 @@ def sequence_gen():
 seq = sequence_gen()
 
 
-def task_factory(cls, instance_only=False, **kwargs):
+def task_factory(cls, callable_name: str = 'scheduler.tests.jobs.test_job', instance_only=False, **kwargs):
     values = dict(
         name='Scheduled Job %d' % next(seq),
         job_id=None,
         queue=list(settings.QUEUES.keys())[0],
-        callable='scheduler.tests.jobs.test_job',
+        callable=callable_name,
         enabled=True,
         timeout=None)
     if cls == ScheduledTask: