Add @override decorators

Classes that implement the `Sender` or `Receiver` interfaces
currently need to override the `send` or the `ready` and `consume`
methods respectively.

As we add more methods, to these interfaces, it becomes hard to track
which methods are there for internal use and which ones are there to
implement the interface.

Using the `override` decorators helps with that.

Signed-off-by: Sahas Subramanian <[email protected]>

Author: shsms

src/frequenz/channels/_anycast.py

@@ -10,6 +10,8 @@
 from collections import deque
 from typing import Generic, TypeVar
 
+from typing_extensions import override
+
 from ._exceptions import ChannelClosedError
 from ._generic import ChannelMessageT
 from ._receiver import Receiver, ReceiverStoppedError
@@ -320,6 +322,7 @@ def __init__(self, channel: Anycast[_T], /) -> None:
         self._channel: Anycast[_T] = channel
         """The channel that this sender belongs to."""
 
+    @override
     async def send(self, message: _T, /) -> None:
         """Send a message across the channel.
 
@@ -390,6 +393,7 @@ def __init__(self, channel: Anycast[_T], /) -> None:
 
         self._next: _T | type[_Empty] = _Empty
 
+    @override
     async def ready(self) -> bool:
         """Wait until the receiver is ready with a message or an error.
 
@@ -417,6 +421,7 @@ async def ready(self) -> bool:
         # pylint: enable=protected-access
         return True
 
+    @override
     def consume(self) -> _T:
         """Return the latest message once `ready()` is complete.
 

src/frequenz/channels/_broadcast.py

@@ -11,6 +11,8 @@
 from collections import deque
 from typing import Generic, TypeVar
 
+from typing_extensions import override
+
 from ._exceptions import ChannelClosedError
 from ._generic import ChannelMessageT
 from ._receiver import Receiver, ReceiverStoppedError
@@ -323,6 +325,7 @@ def __init__(self, channel: Broadcast[_T], /) -> None:
         self._channel: Broadcast[_T] = channel
         """The broadcast channel this sender belongs to."""
 
+    @override
     async def send(self, message: _T, /) -> None:
         """Send a message to all broadcast receivers.
 
@@ -426,6 +429,7 @@ def __len__(self) -> int:
         """
         return len(self._q)
 
+    @override
     async def ready(self) -> bool:
         """Wait until the receiver is ready with a message or an error.
 
@@ -454,6 +458,7 @@ async def ready(self) -> bool:
         return True
         # pylint: enable=protected-access
 
+    @override
     def consume(self) -> _T:
         """Return the latest message once `ready` is complete.
 

src/frequenz/channels/_merge.py

@@ -54,6 +54,8 @@
 from collections import deque
 from typing import Any
 
+from typing_extensions import override
+
 from ._generic import ReceiverMessageT_co
 from ._receiver import Receiver, ReceiverStoppedError
 
@@ -135,6 +137,7 @@ async def stop(self) -> None:
         await asyncio.gather(*self._pending, return_exceptions=True)
         self._pending = set()
 
+    @override
     async def ready(self) -> bool:
         """Wait until the receiver is ready with a message or an error.
 
@@ -171,6 +174,7 @@ async def ready(self) -> bool:
                     asyncio.create_task(anext(self._receivers[name]), name=name)
                 )
 
+    @override
     def consume(self) -> ReceiverMessageT_co:
         """Return the latest message once `ready` is complete.
 

src/frequenz/channels/_receiver.py

@@ -157,6 +157,8 @@
 from collections.abc import Callable
 from typing import TYPE_CHECKING, Any, Generic, Self, TypeGuard, TypeVar, overload
 
+from typing_extensions import override
+
 from ._exceptions import Error
 from ._generic import MappedMessageT_co, ReceiverMessageT_co
 
@@ -433,6 +435,7 @@ def __init__(
         )
         """The function to apply on the input data."""
 
+    @override
     async def ready(self) -> bool:
         """Wait until the receiver is ready with a message or an error.
 
@@ -448,6 +451,7 @@ async def ready(self) -> bool:
 
     # We need a noqa here because the docs have a Raises section but the code doesn't
     # explicitly raise anything.
+    @override
     def consume(self) -> MappedMessageT_co:  # noqa: DOC502
         """Return a transformed message once `ready()` is complete.
 
@@ -509,6 +513,7 @@ def __init__(
 
         self._recv_closed = False
 
+    @override
     async def ready(self) -> bool:
         """Wait until the receiver is ready with a message or an error.
 
@@ -528,6 +533,7 @@ async def ready(self) -> bool:
         self._recv_closed = True
         return False
 
+    @override
     def consume(self) -> ReceiverMessageT_co:
         """Return a transformed message once `ready()` is complete.
 

src/frequenz/channels/event.py

@@ -16,6 +16,8 @@
 
 import asyncio as _asyncio
 
+from typing_extensions import override
+
 from frequenz.channels._receiver import Receiver, ReceiverStoppedError
 
 
@@ -141,6 +143,7 @@ def set(self) -> None:
         self._is_set = True
         self._event.set()
 
+    @override
     async def ready(self) -> bool:
         """Wait until this receiver is ready.
 
@@ -152,6 +155,7 @@ async def ready(self) -> bool:
         await self._event.wait()
         return not self._is_stopped
 
+    @override
     def consume(self) -> None:
         """Consume the event.
 

src/frequenz/channels/experimental/_relay_sender.py

@@ -9,6 +9,8 @@
 
 import typing
 
+from typing_extensions import override
+
 from .._generic import SenderMessageT_contra
 from .._sender import Sender
 
@@ -46,6 +48,7 @@ def __init__(self, *senders: Sender[SenderMessageT_contra]) -> None:
         """
         self._senders = senders
 
+    @override
     async def send(self, message: SenderMessageT_contra, /) -> None:
         """Send a message.
 

src/frequenz/channels/file_watcher.py

@@ -25,6 +25,7 @@
 from datetime import timedelta
 from enum import Enum
 
+from typing_extensions import override
 from watchfiles import Change, awatch
 from watchfiles.main import FileChange
 
@@ -185,6 +186,7 @@ def __del__(self) -> None:
         # is stopped.
         self._stop_event.set()
 
+    @override
     async def ready(self) -> bool:
         """Wait until the receiver is ready with a message or an error.
 
@@ -212,6 +214,7 @@ async def ready(self) -> bool:
 
         return True
 
+    @override
     def consume(self) -> Event:
         """Return the latest event once `ready` is complete.
 

src/frequenz/channels/timer.py

@@ -102,6 +102,8 @@ async def main() -> None:
 import asyncio
 from datetime import timedelta
 
+from typing_extensions import override
+
 from ._receiver import Receiver, ReceiverStoppedError
 
 
@@ -644,6 +646,7 @@ def stop(self) -> None:
 
     # We need a noqa here because the docs have a Raises section but the documented
     # exceptions are raised indirectly.
+    @override
     async def ready(self) -> bool:  # noqa: DOC502
         """Wait until the timer `interval` passed.
 
@@ -715,6 +718,7 @@ async def ready(self) -> bool:  # noqa: DOC502
 
         return True
 
+    @override
     def consume(self) -> timedelta:
         """Return the latest drift once `ready()` is complete.