add singleton design pattern

Author: grillazz

app/utils.py

@@ -1,21 +1,18 @@
-import logging
-from functools import lru_cache
+from threading import Lock
 
-from rich.console import Console
-from rich.logging import RichHandler
 
-console = Console(color_system="256", width=200, style="blue")
+class SingletonMeta(type):
+    """
+    This is a thread-safe implementation of Singleton.
+    """
 
+    _instances = {}
 
-@lru_cache
-def get_logger(module_name):
-    logger = logging.getLogger(module_name)
-    handler = RichHandler(
-        rich_tracebacks=True, console=console, tracebacks_show_locals=True
-    )
-    handler.setFormatter(
-        logging.Formatter("[ %(threadName)s:%(funcName)s:%(lineno)d ] - %(message)s")
-    )
-    logger.addHandler(handler)
-    logger.setLevel(logging.DEBUG)
-    return logger
+    _lock: Lock = Lock()
+
+    def __call__(cls, *args, **kwargs):
+        with cls._lock:
+            if cls not in cls._instances:
+                instance = super().__call__(*args, **kwargs)
+                cls._instances[cls] = instance
+        return cls._instances[cls]