Add context manager support for bot client

The bot client now supports the context manager protocol, providing automatic resource management. This enhancement helps to automatically close the session when leaving the context, which cleans up resources better. The documentation and tests have been updated accordingly to illustrate this new feature. Moreover, an example of usage without a dispatcher has been provided to clarify its use in simple cases.

aiogram/client/bot.py

@@ -5,6 +5,7 @@ import io
 import pathlib
 import warnings
 from contextlib import asynccontextmanager
+from types import TracebackType
 from typing import (
     Any,
     AsyncGenerator,
@@ -12,6 +13,7 @@ from typing import (
     BinaryIO,
     List,
     Optional,
+    Type,
     TypeVar,
     Union,
     cast,
@@ -300,6 +302,17 @@ class Bot:
         self.__token = token
         self._me: Optional[User] = None
 
+    async def __aenter__(self) -> "Bot":
+        return self
+
+    async def __aexit__(
+        self,
+        exc_type: Optional[Type[BaseException]],
+        exc_value: Optional[BaseException],
+        traceback: Optional[TracebackType],
+    ) -> None:
+        await self.session.close()
+
     @property
     def parse_mode(self) -> Optional[str]:
         warnings.warn(

docs/index.rst

@@ -5,6 +5,15 @@ Simple usage
 
 .. literalinclude:: ../examples/echo_bot.py
 
+
+Usage without dispatcher
+------------------------
+
+Just only interact with Bot API, without handling events
+
+.. literalinclude:: ../examples/without_dispatcher.py
+
+
 Contents
 ========
 

examples/without_dispatcher.py

@@ -0,0 +1,36 @@
+import asyncio
+from argparse import ArgumentParser
+
+from aiogram import Bot
+from aiogram.client.default import DefaultBotProperties
+from aiogram.enums import ParseMode
+
+
+def create_parser() -> ArgumentParser:
+    parser = ArgumentParser()
+    parser.add_argument("--token", help="Telegram Bot API Token")
+    parser.add_argument("--chat-id", type=int, help="Target chat id")
+    parser.add_argument("--message", "-m", help="Message text to sent", default="Hello, World!")
+
+    return parser
+
+
+async def main():
+    parser = create_parser()
+    ns = parser.parse_args()
+
+    token = ns.token
+    chat_id = ns.chat_id
+    message = ns.message
+
+    async with Bot(
+        token=token,
+        default=DefaultBotProperties(
+            parse_mode=ParseMode.HTML,
+        ),
+    ) as bot:
+        await bot.send_message(chat_id=chat_id, text=message)
+
+
+if __name__ == "__main__":
+    asyncio.run(main())

tests/test_api/test_client/test_bot.py

@@ -14,6 +14,7 @@ from aiogram.methods import GetFile, GetMe
 from aiogram.types import File, PhotoSize
 from tests.deprecated import check_deprecated
 from tests.mocked_bot import MockedBot
+from tests.test_api.test_client.test_session.test_base_session import CustomSession
 
 
 @pytest.fixture()
@@ -42,6 +43,18 @@ class TestBot:
         assert isinstance(bot.session, AiohttpSession)
         assert bot.id == 42
 
+    async def test_bot_context_manager_over_session(self):
+        session = CustomSession()
+        with patch(
+            "tests.test_api.test_client.test_session.test_base_session.CustomSession.close",
+            new_callable=AsyncMock,
+        ) as mocked_close:
+            async with Bot(token="42:TEST", session=session) as bot:
+                assert bot.id == 42
+                assert bot.session is session
+
+            mocked_close.assert_awaited_once()
+
     def test_init_default(self):
         with check_deprecated(
             max_version="3.7.0",