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import asyncio
from contextlib import contextmanager
from typing import Any, Generator, Iterator
class PubSub:
_instance = None
def __init__(self):
self.queues: list[asyncio.Queue] = []
@classmethod
def instance(cls) -> 'PubSub':
if cls._instance == None:
cls._instance = cls()
return cls._instance
@classmethod
@contextmanager
def subscribe(cls) -> Iterator[asyncio.Queue]:
queue = asyncio.Queue()
instance = cls.instance()
instance.queues.append(queue)
try:
yield queue
finally:
instance.queues.remove(queue)
del queue
@classmethod
async def publish(cls, msg: Any):
for queue in cls.instance().queues:
await queue.put(msg)
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