Add SettingsService class to manage settings from YAML file

src/backend/langflow/services/settings/manager.py

@@ -0,0 +1,44 @@
+from langflow.services.base import Service
+from langflow.services.settings.auth import AuthSettings
+from langflow.services.settings.base import Settings
+from loguru import logger
+import os
+import yaml
+
+
+class SettingsService(Service):
+    name = "settings_service"
+
+    def __init__(self, settings: Settings, auth_settings: AuthSettings):
+        super().__init__()
+        self.settings = settings
+        self.auth_settings = auth_settings
+
+    @classmethod
+    def load_settings_from_yaml(cls, file_path: str) -> "SettingsService":
+        # Check if a string is a valid path or a file name
+        if "/" not in file_path:
+            # Get current path
+            current_path = os.path.dirname(os.path.abspath(__file__))
+
+            file_path = os.path.join(current_path, file_path)
+
+        with open(file_path, "r") as f:
+            settings_dict = yaml.safe_load(f)
+            settings_dict = {k.upper(): v for k, v in settings_dict.items()}
+
+            for key in settings_dict:
+                if key not in Settings.__fields__.keys():
+                    raise KeyError(f"Key {key} not found in settings")
+                logger.debug(
+                    f"Loading {len(settings_dict[key])} {key} from {file_path}"
+                )
+
+        settings = Settings(**settings_dict)
+        if not settings.CONFIG_DIR:
+            raise ValueError("CONFIG_DIR must be set in settings")
+
+        auth_settings = AuthSettings(
+            CONFIG_DIR=settings.CONFIG_DIR,
+        )
+        return cls(settings, auth_settings)