废弃 huey，多数据库连接的时候存在 connection 无法释放的问题，回到 celery

submission/tasks.py

@@ -1,9 +1,9 @@
 # coding=utf-8
-from huey.djhuey import db_task
-
+from __future__ import absolute_import
+from celery import shared_task
 from judge_dispatcher.tasks import JudgeDispatcher
 
 
-@db_task()
-def _judge(submission, time_limit, memory_limit, test_case_id, is_waiting_task=False):
-    JudgeDispatcher(submission, time_limit, memory_limit, test_case_id).judge(is_waiting_task)
+@shared_task
+def _judge(submission, time_limit, memory_limit, test_case_id):
+    JudgeDispatcher(submission, time_limit, memory_limit, test_case_id).judge()