Add ctx module. Aliases for keys in execution context.

aiogram/dispatcher/ctx.py

@@ -0,0 +1,39 @@
+from . import Bot
+from .. import types
+from ..dispatcher import Dispatcher, FSMContext, MODE, UPDATE_OBJECT
+from ..utils import context
+
+
+def _get(key, default=None, no_error=False):
+    result = context.get_value(key, default)
+    if not no_error and result is None:
+        raise RuntimeError(f"Context is not configured for '{key}'")
+    return result
+
+
+def get_bot() -> Bot:
+    return _get('bot')
+
+
+def get_dispatcher() -> Dispatcher:
+    return _get('dispatcher')
+
+
+def get_update() -> types.Update:
+    return _get(UPDATE_OBJECT)
+
+
+def get_mode() -> str:
+    return _get(MODE, 'unknown')
+
+
+def get_chat() -> int:
+    return _get('chat', no_error=True)
+
+
+def get_user() -> int:
+    return _get('user', no_error=True)
+
+
+def get_state() -> FSMContext:
+    return get_dispatcher().current_state()