MPT-18999 temporarily memoize _get_encryption_salt to reduce ectd calls

Author: ffaraone

rest_api/rest_api_server/utils.py

@@ -11,6 +11,7 @@
 from concurrent.futures import ThreadPoolExecutor
 from datetime import datetime
 from decimal import Decimal
+from functools import cache
 from string import ascii_letters, digits
 from urllib.parse import urlencode
 
@@ -523,6 +524,7 @@ def get_root_directory_path():
     return os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
 
 
+@cache
 def _get_encryption_salt():
     return Config().client.encryption_salt()