py-libp2p/libp2p/io/trio.py
2020-01-26 23:09:56 +08:00

41 lines
1.3 KiB
Python

import logging
import trio
from libp2p.io.abc import ReadWriteCloser
from libp2p.io.exceptions import IOException
logger = logging.getLogger("libp2p.io.trio")
class TrioTCPStream(ReadWriteCloser):
stream: trio.SocketStream
# NOTE: Add both read and write lock to avoid `trio.BusyResourceError`
read_lock: trio.Lock
write_lock: trio.Lock
def __init__(self, stream: trio.SocketStream) -> None:
self.stream = stream
self.read_lock = trio.Lock()
self.write_lock = trio.Lock()
async def write(self, data: bytes) -> None:
"""Raise `RawConnError` if the underlying connection breaks."""
async with self.write_lock:
try:
await self.stream.send_all(data)
except (trio.ClosedResourceError, trio.BrokenResourceError) as error:
raise IOException from error
async def read(self, n: int = None) -> bytes:
async with self.read_lock:
if n is not None and n == 0:
return b""
try:
return await self.stream.receive_some(n)
except (trio.ClosedResourceError, trio.BrokenResourceError) as error:
raise IOException from error
async def close(self) -> None:
await self.stream.aclose()