Add missing import in worker module #1959

Signed-off-by: tdruez <tdruez@aboutcode.org>

Author: tdruez

scancodeio/worker.py

@@ -20,6 +20,7 @@
 # ScanCode.io is a free software code scanning tool from nexB Inc. and others.
 # Visit https://github.com/aboutcode-org/scancode.io for support and download.
 
+from django import db as django_db
 from django.apps import apps
 
 from rq.queue import Queue
@@ -57,15 +58,15 @@ def run_maintenance_tasks(self):
 class ScanCodeIOTlsWorker(ScanCodeIOWorker):
     """
     Modified version of RQ Worker including ScanCode.io customizations for
-    maintainance task and TLS.
+    maintenance tasks and TLS.
     """
 
     def execute_job(self, job, queue):
         """
-        Terminate existing connection to avoid issues with TLS.
+        Terminate existing database connection to avoid issues with TLS.
         https://github.com/aboutcode-org/scancode.io/issues/1523
         """
-        connection.close()
+        django_db.connection.close()
         super().execute_job(job, queue)
 
 
@@ -78,7 +79,7 @@ class ScanCodeIOQueue(Queue):
     def acquire_maintenance_lock(self) -> bool:
         """Return a boolean indicating if a lock to clean this queue is acquired."""
         lock_acquired = self.connection.set(
-            self.registry_cleaning_key, 1, nx=1, ex=self.cleaning_lock_ttl
+            self.registry_cleaning_key, 1, nx=True, ex=self.cleaning_lock_ttl
         )
         if not lock_acquired:
             return False