47 lines
1.4 KiB
Python
47 lines
1.4 KiB
Python
from types import TracebackType
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from typing import AsyncIterator, Optional, Type
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import trio
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from .abc import ISubscriptionAPI
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from .pb import rpc_pb2
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from .typing import UnsubscribeFn
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class BaseSubscriptionAPI(ISubscriptionAPI):
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async def __aenter__(self) -> "BaseSubscriptionAPI":
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await trio.lowlevel.checkpoint()
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return self
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async def __aexit__(
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self,
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exc_type: "Optional[Type[BaseException]]",
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exc_value: "Optional[BaseException]",
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traceback: "Optional[TracebackType]",
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) -> None:
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await self.unsubscribe()
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class TrioSubscriptionAPI(BaseSubscriptionAPI):
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receive_channel: "trio.MemoryReceiveChannel[rpc_pb2.Message]"
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unsubscribe_fn: UnsubscribeFn
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def __init__(
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self,
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receive_channel: "trio.MemoryReceiveChannel[rpc_pb2.Message]",
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unsubscribe_fn: UnsubscribeFn,
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) -> None:
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self.receive_channel = receive_channel
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# Ignore type here since mypy complains: https://github.com/python/mypy/issues/2427
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self.unsubscribe_fn = unsubscribe_fn # type: ignore
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async def unsubscribe(self) -> None:
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# Ignore type here since mypy complains: https://github.com/python/mypy/issues/2427
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await self.unsubscribe_fn() # type: ignore
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def __aiter__(self) -> AsyncIterator[rpc_pb2.Message]:
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return self.receive_channel.__aiter__()
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async def get(self) -> rpc_pb2.Message:
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return await self.receive_channel.receive()
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