Created
July 15, 2024 22:35
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| from asyncio import Queue | |
| from typing import Callable, TypeVar, Generic, AsyncIterable | |
| T = TypeVar("T") | |
| class EventEmitter(Generic[T]): | |
| listeners: set[Callable[[T], None]] = set() | |
| def add_listener(self, listener: Callable[[T], None]): | |
| self.listeners.add(listener) | |
| def remove_listener(self, listener: Callable[[T], None]): | |
| self.listeners.remove(listener) | |
| def emit(self, data: T): | |
| for listener in self.listeners: | |
| try: | |
| listener(data) | |
| except: | |
| pass | |
| async def to_async_iterable(emitter: EventEmitter[T]) -> AsyncIterable[T]: | |
| queue: Queue[T] = Queue() | |
| def listener(data: T): | |
| queue.put_nowait(data) | |
| emitter.add_listener(listener) | |
| try: | |
| while True: | |
| yield await queue.get() | |
| finally: | |
| emitter.remove_listener(listener) |
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