Merge pull request 'Log key cache expiry dates' (#156) from bugfix/key-queue-ttl-logs into develop

Reviewed-on: #156

lacre/keymgmt.py

@@ -1,6 +1,7 @@
 """Key management utilities."""
 
 from datetime import datetime, timedelta
+import logging
 
 from lacre.config import get_item
 
@@ -9,6 +10,9 @@ from lacre.config import get_item
 _DEFAULT_TTL = 1
 
 
+LOG = logging.getLogger(__name__)
+
+
 def calculate_expiry_date(now: datetime) -> datetime:
     """Calculate date-time of key queue item expiry.
 
@@ -24,7 +28,9 @@ def _get_ttl():
     max_hours = get_item('database', 'max_queue_hours', _DEFAULT_TTL)
     try:
         ttl =  int(max_hours)
+        LOG.debug('Key configmration queue max item age: %d hours', ttl)
         return ttl
     except ValueError:
         # Not a valid integer, so we return the default.
+        LOG.exception('Invalid max_queue_hours format: %s, using default (%d)', max_hours, _DEFAULT_TTL)
         return _DEFAULT_TTL