later 26.8.1

What is later?

later is a play on Async not happening now but at some point in the future. It was also an awesome name for a toolkit for writing AsyncIO applications. The batteries if you will for AsyncIO.

later is a collection of asyncio batteries created at Meta for supporting asyncio services.

later offers the following:

• Unittesting

  • later.unittest.TestCase - An IsolatedAsyncioTestCase that insures tasks are not left orphaned and asyncio never calls its error handler.

  • later.unittest.mock.AsyncContextManager - A factory for easy mocking out AsyncContextManager

• Tasks*

  • later.cancel - The correct way to cancel a Task/Future and insure it is awaited

  • later.as_task - Decorator to turn coroutines into Tasks.

  • later.Watcher - Watch tasks and ensure they don’t die - take action when they do. This is kinda like a asyncio.TaskGroup

  • later.herd - A Decorator that provides coroutines with basic thundering herd protection.

  • later.task.TaskSentinel - A Completed Future, a default value for a asyncio.Task argument so you don’t also have to accept None.

• Synchronization

  • later.event.BiDirectionalEvent - two way asyncio.Event for Handshake style synchronization.