cache-key: make cleanup safe so we don't cause any errors on exit in case it fails..

rhodecode/lib/rc_cache/cache_key_meta.py

@@ -1,35 +1,40 b''
 # -*- coding: utf-8 -*-
 
 # Copyright (C) 2015-2019 RhodeCode GmbH
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License, version 3
 # (only), as published by the Free Software Foundation.
 #
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 # This program is dual-licensed. If you wish to learn more about the
 # RhodeCode Enterprise Edition, including its added features, Support services,
 # and proprietary license terms, please see https://rhodecode.com/licenses/
 
 import atexit
 import logging
 
 log = logging.getLogger(__name__)
 
 cache_keys_by_pid = []
 
 
 @atexit.register
 def free_cache_keys():
     from rhodecode.model.db import Session, CacheKey
     log.info('Clearing %s cache keys', len(cache_keys_by_pid))
+
+    if cache_keys_by_pid:
+        try:
     for cache_key in cache_keys_by_pid:
         CacheKey.query().filter(CacheKey.cache_key == cache_key).delete()
     Session().commit()
+        except Exception:
+            log.warn('Failed to clear keys, exiting gracefully')