56 lines
2.0 KiB
Python
56 lines
2.0 KiB
Python
import logging
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import trio
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from libp2p.io.abc import ReadWriteCloser
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from libp2p.io.exceptions import IOException
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logger = logging.getLogger("libp2p.io.trio")
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class TrioTCPStream(ReadWriteCloser):
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stream: trio.SocketStream
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# NOTE: Add both read and write lock to avoid `trio.BusyResourceError`
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read_lock: trio.Lock
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write_lock: trio.Lock
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def __init__(self, stream: trio.SocketStream) -> None:
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self.stream = stream
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self.read_lock = trio.Lock()
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self.write_lock = trio.Lock()
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async def write(self, data: bytes) -> None:
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"""Raise `RawConnError` if the underlying connection breaks."""
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async with self.write_lock:
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try:
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await self.stream.send_all(data)
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except (trio.ClosedResourceError, trio.BrokenResourceError) as error:
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raise IOException from error
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except trio.BusyResourceError as error:
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# This should never happen, since we already access streams with read/write locks.
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raise Exception(
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"this should never happen "
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"since we already access streams with read/write locks."
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) from error
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async def read(self, n: int = -1) -> bytes:
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async with self.read_lock:
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if n == 0:
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# Checkpoint
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await trio.hazmat.checkpoint()
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return b""
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max_bytes = n if n != -1 else None
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try:
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return await self.stream.receive_some(max_bytes)
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except (trio.ClosedResourceError, trio.BrokenResourceError) as error:
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raise IOException from error
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except trio.BusyResourceError as error:
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# This should never happen, since we already access streams with read/write locks.
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raise Exception(
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"this should never happen "
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"since we already access streams with read/write locks."
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) from error
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async def close(self) -> None:
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await self.stream.aclose()
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