Cat as singleton

core/cat/looking_glass/cheshire_cat.py

@@ -28,7 +28,7 @@
 MSG_TYPES = Literal["notification", "chat", "error", "chat_token"]
 
 # main class
-class CheshireCat:
+class CheshireCat():
     """The Cheshire Cat.
 
     This is the main class that manages everything.
@@ -40,6 +40,14 @@ class CheshireCat:
 
     """
 
+    _instance = None
+
+    def __new__(cls):
+        if not cls._instance:
+            cls._instance = super().__new__(cls)
+            cls._instance = CheshireCat()
+        return cls._instance
+
     def __init__(self):
         """Cat initialization.
 
@@ -532,3 +540,5 @@ def get_static_path():
         """Allows the Cat expose the static files path."""
         log.warning("This method will be removed, import cat.utils tu usit instead.")
         return utils.get_static_path()
+
+cat = CheshireCat()

core/cat/main.py

@@ -14,7 +14,7 @@
 from cat.routes.static import public, admin, static
 from cat.api_auth import check_api_key
 from cat.routes.openapi import get_openapi_configuration_function
-from cat.looking_glass.cheshire_cat import CheshireCat
+from cat.looking_glass.cheshire_cat import cat
 
 
 @asynccontextmanager
@@ -26,7 +26,7 @@ async def lifespan(app: FastAPI):
     # - Not using midlleware because I can't make it work with both http and websocket;
     # - Not using Depends because it only supports callables (not instances)
     # - Starlette allows this: https://www.starlette.io/applications/#storing-state-on-the-app-instance
-    app.state.ccat = CheshireCat()
+    app.state.ccat = cat
 
     # startup message with admin, public and swagger addresses
     log.welcome()