add method to obtain the migration state of Tower

awx/conf/settings.py

@@ -19,6 +19,7 @@ from rest_framework.fields import empty, SkipField
 
 # Tower
 from awx.main.utils import encrypt_field, decrypt_field
+from awx.main.utils.db import get_tower_migration_version
 from awx.conf import settings_registry
 from awx.conf.models import Setting
 
@@ -59,7 +60,10 @@ def _log_database_error():
     try:
         yield
     except (ProgrammingError, OperationalError) as e:
-        logger.warning('Database settings are not available, using defaults (%s)', e, exc_info=True)
+        if get_tower_migration_version() < '310':
+            logger.info('Using default settings until version 3.1 migration.')
+        else:
+            logger.warning('Database settings are not available, using defaults (%s)', e, exc_info=True)
     finally:
         pass
 

awx/main/utils/db.py

@@ -0,0 +1,22 @@
+# Copyright (c) 2017 Ansible by Red Hat
+# All Rights Reserved.
+
+# Django database
+from django.db.migrations.loader import MigrationLoader
+from django.db import connection
+
+# Python
+import re
+
+
+def get_tower_migration_version():
+    loader = MigrationLoader(connection, ignore_no_migrations=True)
+    v = '000'
+    for app_name, migration_name in loader.applied_migrations:
+        if app_name == 'main':
+            version_captures = re.findall('^[0-9]{4}_v([0-9]{3})_', migration_name)
+            if len(version_captures) == 1:
+                migration_version = version_captures[0]
+                if migration_version > v:
+                    v = migration_version
+    return v