feat(utils): deprecated descriptor

deprecate CHOSEN_INLINE_QUERY and always return CHOSEN_INLINE_RESULT instead of incorrect value

aiogram/types/update.py

@@ -9,7 +9,7 @@ from .message import Message
 from .poll import Poll, PollAnswer
 from .pre_checkout_query import PreCheckoutQuery
 from .shipping_query import ShippingQuery
-from ..utils import helper
+from ..utils import helper, deprecated
 
 
 class Update(base.TelegramObject):
@@ -61,3 +61,9 @@ class AllowedUpdates(helper.Helper):
     PRE_CHECKOUT_QUERY = helper.ListItem()  # pre_checkout_query
     POLL = helper.ListItem()  # poll
     POLL_ANSWER = helper.ListItem()  # poll_answer
+
+    CHOSEN_INLINE_QUERY = deprecated.DeprecatedReadOnlyClassVar(
+        "`CHOSEN_INLINE_QUERY` is a deprecated value for allowed update. "
+        "Use `CHOSEN_INLINE_RESULT`",
+        new_value_getter=lambda cls: cls.CHOSEN_INLINE_RESULT,
+    )

aiogram/utils/deprecated.py

@@ -2,7 +2,7 @@ import asyncio
 import inspect
 import warnings
 import functools
-from typing import Callable
+from typing import Callable, Generic, TypeVar, Type, Optional
 
 
 def deprecated(reason, stacklevel=2) -> Callable:
@@ -129,3 +129,36 @@ def renamed_argument(old_name: str, new_name: str, until_version: str, stackleve
         return wrapped
 
     return decorator
+
+
+_VT = TypeVar("_VT")
+_OwnerCls = TypeVar("_OwnerCls")
+
+
+class DeprecatedReadOnlyClassVar(Generic[_OwnerCls, _VT]):
+    """
+    DeprecatedReadOnlyClassVar[Owner, ValueType]
+
+    :param warning_message: Warning message when getter gets called
+    :param new_value_getter: Any callable with (owner_class: Type[Owner]) -> ValueType
+                             signature that will be executed
+
+    Usage example:
+
+    >>> class MyClass:
+    ...     some_attribute: DeprecatedReadOnlyClassVar[MyClass, int] = \
+    ...            DeprecatedReadOnlyClassVar(
+    ...                  "Warning message.", lambda owner: 15)
+    ...
+    >>> MyClass.some_attribute  # does warning.warn with `Warning message` and returns 15 in the current case
+    """
+
+    __slots__ = "_new_value_getter", "_warning_message"
+
+    def __init__(self, warning_message: str, new_value_getter: Callable[[_OwnerCls], _VT]):
+        self._warning_message = warning_message
+        self._new_value_getter = new_value_getter
+
+    def __get__(self, instance: Optional[_OwnerCls], owner: Type[_OwnerCls]):
+        warn_deprecated(self._warning_message)
+        return self._new_value_getter(owner)

tests/test_utils/test_deprecated.py

@@ -0,0 +1,19 @@
+import pytest
+
+from aiogram.utils.deprecated import DeprecatedReadOnlyClassVar
+
+
+def test_DeprecatedReadOnlyClassVarCD():
+    assert DeprecatedReadOnlyClassVar.__slots__ == ("_new_value_getter", "_warning_message")
+
+    new_value_of_deprecated_cls_cd = "mpa"
+    pseudo_owner_cls = type("OpekaCla$$", (), {})
+    deprecated_cd = DeprecatedReadOnlyClassVar("mopekaa", lambda owner: new_value_of_deprecated_cls_cd)
+
+    with pytest.warns(DeprecationWarning):
+        assert deprecated_cd.__get__(None, pseudo_owner_cls) == new_value_of_deprecated_cls_cd
+
+    class MyClass:
+        some_attribute: DeprecatedReadOnlyClassVar["MyClass", int] = \
+            DeprecatedReadOnlyClassVar(
+                "Warning message.", lambda owner: 15)