Initial commit

venv/Lib/site-packages/aiogram/dispatcher/event/event.py

@@ -0,0 +1,53 @@
+from __future__ import annotations
+
+from typing import Any, Callable, List
+
+from .handler import CallbackType, HandlerObject
+
+
+class EventObserver:
+    """
+    Simple events observer
+
+    Is used for managing events is not related with Telegram
+    (For example startup/shutdown processes)
+
+    Handlers can be registered via decorator or method
+
+    .. code-block:: python
+
+        <observer>.register(my_handler)
+
+    .. code-block:: python
+
+        @<observer>()
+        async def my_handler(*args, **kwargs): ...
+    """
+
+    def __init__(self) -> None:
+        self.handlers: List[HandlerObject] = []
+
+    def register(self, callback: CallbackType) -> None:
+        """
+        Register callback with filters
+        """
+        self.handlers.append(HandlerObject(callback=callback))
+
+    async def trigger(self, *args: Any, **kwargs: Any) -> None:
+        """
+        Propagate event to handlers.
+        Handler will be called when all its filters is pass.
+        """
+        for handler in self.handlers:
+            await handler.call(*args, **kwargs)
+
+    def __call__(self) -> Callable[[CallbackType], CallbackType]:
+        """
+        Decorator for registering event handlers
+        """
+
+        def wrapper(callback: CallbackType) -> CallbackType:
+            self.register(callback)
+            return callback
+
+        return wrapper