Creational design pattern

Author: dohyun97

cre.py

@@ -0,0 +1,41 @@
+"""app.config.py"""
+import functools
+import logging
+
+from pydantic import AnyUrl, BaseSettings
+
+CFG_LOGGER = logging.getLogger("app.config")
+
+
+class _Settings(BaseSettings):
+    __instance = None
+
+    def __init__(self):
+        if not _Settings.__instance:
+            print("I have already got")
+        else:
+            port: int = 5000
+            rediscloud_url: AnyUrl = None
+            local_redis_url: AnyUrl = None
+            # Scout APM
+            scout_name: str = None
+            # Sentry
+            sentry_dsn: str = None
+
+    @functools.lru_cache()
+    def get_settings(**kwargs) -> BaseSettings:
+        """
+         Read settings from the environment or `.env` file.
+         https://pydantic-docs.helpmanual.io/usage/settings/#dotenv-env-support
+
+         Usage:
+         import app.config
+
+         settings = app.config.get_settings(_env_file="")
+         port_number = settings.port
+         """
+        CFG_LOGGER.info("Loading Config settings from Environment ...")
+        if _Settings.__instance is None:
+            _Settings.__instance = _Settings(**kwargs)
+        else:
+            return _Settings(**kwargs)