cache-keys: fix inifinite look of using atexit with signals.

This prevented a grafecull shutdown of gunicorn workers.

rhodecode/lib/rc_cache/cache_key_meta.py

@@ -19,22 +19,37 b''
 # and proprietary license terms, please see https://rhodecode.com/licenses/
 
 import os
+import sys
 import atexit
 import logging
 import signal
+import rhodecode
 
 log = logging.getLogger(__name__)
 
 cache_keys_by_pid = set()
 
 
+def sigHandler(signo, frame):
+    """
+    signals trigger sys.exit so there's a single handler to cleanup the code.
+    """
+    if rhodecode.is_test:
+        return
+
+    sys.exit(0)
+
+
 def free_cache_keys(*args):
+    from rhodecode.model.db import Session, CacheKey
+
+    if rhodecode.is_test:
+        return
+
     ssh_cmd = os.environ.get('RC_CMD_SSH_WRAPPER')
     if ssh_cmd:
         return
 
-    from rhodecode.model.db import Session, CacheKey
-
     if cache_keys_by_pid:
         try:
             for cache_proc in set(cache_keys_by_pid):
@@ -48,7 +63,8 b' def free_cache_keys(*args):'
         except Exception:
             log.exception('Failed to clear keys, exiting gracefully')
 
+atexit.register(free_cache_keys)
 
-atexit.register(free_cache_keys)
-signal.signal(signal.SIGTERM, free_cache_keys)
-signal.signal(signal.SIGINT, free_cache_keys)
+signal.signal(signal.SIGTERM, sigHandler)
+signal.signal(signal.SIGINT, sigHandler)
+