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llucax Leandro Lucarella
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Frequenz channels Release Notes

Summary

This is the first release candidate for version 1.0. It includes few new features and a lot of cleanups and API improvements and polishing. Because of this, there are a lot of breaking changes too, but they should be easy to fix, as they ae mostly renames and reorganizations.

We hope this is the final pre-release before the final 1.0 release, and we don't expect to introduce any further breaking changes. Because of this we encourage you to test it and report any issues you find. You can also use a version constraint like >= 1.0.0-rc.1, < 2.0.0 as the final version should be compatible.

Upgrading

  • Anycast

    • __init__: The maxsize argument was renamed to limit and made keyword-only and a new keyword-only name argument was added.

      You should instantiate using Anycast(name=..., limit=...) (or Anycast(name=...) if the default limit is enough) instead of Anycast(...) or Anycast(maxsize=...).

    • new_sender and new_receiver: They now return a base Sender and Receiver class (respectively) instead of a channel-specific Sender or Receiver subclass.

      This means users now don't have access to the internals to the channel-specific Sender and Receiver subclasses.

  • Broadcast

    • __init__: The name argument was made optional and keyword-only; resend_latest was also made keyword-only. If a name is not specified, it will be generated from the id() of the instance.

      You should instantiate using Broadcast(name=name, resend_latest=resend_latest) (or Broadcast() if the defaults are enough) instead of Broadcast(name) or Broadcast(name, resend_latest).

    • new_receiver: The maxsize argument was renamed to limit and made keyword-only; the name argument was also made keyword-only. If a name is not specified, it will be generated from the id() of the instance instead of a random UUID.

      You should use .new_receiver(name=name, limit=limit) (or .new_receiver() if the defaults are enough) instead of .new_receiver(name) or .new_receiver(name, maxsize).

    • new_sender and new_receiver now return a base Sender and Receiver class (respectively) instead of a channel-specific Sender or Receiver subclass.

      This means users now don't have access to the internals to the channel-specific Sender and Receiver subclasses.

  • Event

    • __init__: The name argument was made keyword-only. The default was changed to a more readable version of id(self).

      You should instantiate using Event(name=...) instead of Event(...).

    • Moved from frequenz.channels.util to frequenz.channels.event.

  • FileWatcher

    • Moved from frequenz.channels.util to frequenz.channels.file_watcher.

    • Support classes are no longer nested inside FileWatcher. They are now top-level classes within the new frequenz.channels.file_watcher module (e.g., frequenz.channels.util.FileWatcher.EventType -> frequenz.channels.file_watcher.EventType, frequenz.channels.util.FileWatcher.Event -> frequenz.channels.file_watcher.Event).

  • Receiver

    • The map() function now takes a positional-only argument, if you were using receiver.map(call=fun) you should replace it with receiver.map(func).

  • SelectError now inherits from channels.Error instead of BaseException, so you should be able to catch it with except Exception: or except channels.Error:.

  • Selected

    • The value property was renamed to message.
    • was_stopped is now a property, you need to replace selected.was_stopped() with selected.was_stopped.

  • Sender

    • The send method now takes a positional-only argument, if you were using sender.send(msg=message) you should replace it with sender.send(message).

  • Timer and support classes

    • Moved from frequenz.channels.util to frequenz.channels.timer.

  • All exceptions that took Any as the message argument now take str instead.

    If you were passing a non-str value to an exception, you should convert it using str(value) before passing it to the exception.

  • The following symbols were moved to the top-level frequenz.channels package:

    • Selected
    • SelectError
    • UnhandledSelectedError
    • select
    • selected_from

Removals

  • Bidirectional

    This channel was removed as it is not recommended practice and was a niche use case. If you need to use it, you can set up two channels or copy the Bidirectional class from the previous version to your project.

  • Merge

    Replaced by the new merge() function. When replacing Merge with merge() please keep in mind that this new function will raise a ValueError if no receivers are passed to it.

    Please note that the old Merge class is still also available but it was renamed to Merger to avoid confusion with the new merge() function, but it is only present for typing reasons and should not be used directly.

  • MergeNamed

    This class was redundant, use either the new merge() function or select() instead.

  • Peekable

    This class was removed because it was merely a shortcut to a receiver that caches the last message received. It did not fit the channel abstraction well and was infrequently used.

    You can replace it with a task that receives and retains the last message.

  • Broadcast.new_peekable()

    This was removed alongside Peekable.

  • Receiver.into_peekable()

    This was removed alongside Peekable.

  • ReceiverInvalidatedError

    This was removed alongside Peekable (it was only raised when using a Receiver that was converted into a Peekable).

  • SelectErrorGroup was removed, a Python built-in BaseExceptionGroup is raised instead in case of unexpected errors while finalizing a select() loop, which will be automatically converted to a simple ExceptionGroup when no exception in the groups is a BaseException.

  • Timer:

    • periodic() and timeout(): The names proved to be too confusing, please use Timer() and pass a missing ticks policy explicitly instead. In general you can update your code by doing:

      • Timer.periodic(interval) / Timer.periodic(interval, skip_missed_ticks=True) -> Timer(interval, TriggerAllMissed())
      • Timer.periodic(interval, skip_missed_ticks=False) -> Timer(interval, SkipMissedAndResync())
      • Timer.timeout(interval) -> Timer(interval, SkipMissedAndDrift())

  • util

    The entire util package was removed and its symbols were either moved to the top-level package or to their own public modules (as noted above).

New Features

  • A new User's Guide was added to the documentation and the documentation was greately improved in general.

  • A new merge() function was added to replace Merge.

  • Anycast

    • The following new read-only properties were added:

      • name: The name of the channel.
      • limit: The maximum number of messages that can be sent to the channel.
      • is_closed: Whether the channel is closed.

    • A more useful implementation of __str__ and repr` were added for the channel and its senders and receivers.

    • A warning will be logged if senders are blocked because the channel buffer is full.

  • Bidirectional

    • The following new read-only properties were added:

      • name: The name of the channel (read-only).
      • is_closed: Whether the channel is closed (read-only).

    • A more useful implementation of __str__ and repr` were added for the channel and the client and service handles.

  • Broadcast

    • The following new read-only properties were added:

      • name: The name of the channel.
      • is_closed: Whether the channel is closed.

    • A more useful implementation of __str__ and repr` were added for the channel and the client and service handles.

  • FileWatcher

    • A more useful implementation of __str__ and repr` were added.

  • Peekable

    • A more useful implementation of __str__ and repr` were added.

  • Receiver

    • map(): The returned map object now has a more useful implementation of __str__ and repr`.

Improvements

  • Receiver, merge/Merger, Error and its derived classes now use a covariant generic type, which allows the generic type to be broader than the actual type.

  • Sender now uses a contravariant generic type, which allows the generic type to be narrower than the required type.

  • ChannelError is now generic, so when accessing the channel attribute, the type of the channel is preserved.

  • The generated documentation / website was greatly improved, both in content and looks.

Bug Fixes

  • Timer: Fix bug that was causing calls to reset() to not reset the timer, if the timer was already being awaited.

What's Changed

Full Changelog: v1.0.0-beta.1...v1.0.0-rc.1

Contributors

Marenz, llucax, and 2 other contributors
Assets 4
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