py-libp2p/libp2p/network/stream/net_stream.py
mhchia fb53edbc04
Change async def write
To return `None` instead of `int. `Writer.write` *does* write all data
in all use case.
2020-02-08 10:24:37 +08:00

75 lines
2.3 KiB
Python

from typing import Optional
from libp2p.stream_muxer.abc import IMuxedStream
from libp2p.stream_muxer.exceptions import (
MuxedStreamClosed,
MuxedStreamEOF,
MuxedStreamReset,
)
from libp2p.typing import TProtocol
from .exceptions import StreamClosed, StreamEOF, StreamReset
from .net_stream_interface import INetStream
# TODO: Handle exceptions from `muxed_stream`
# TODO: Add stream state
# - Reference: https://github.com/libp2p/go-libp2p-swarm/blob/99831444e78c8f23c9335c17d8f7c700ba25ca14/swarm_stream.go # noqa: E501
class NetStream(INetStream):
muxed_stream: IMuxedStream
protocol_id: Optional[TProtocol]
def __init__(self, muxed_stream: IMuxedStream) -> None:
self.muxed_stream = muxed_stream
self.muxed_conn = muxed_stream.muxed_conn
self.protocol_id = None
def get_protocol(self) -> TProtocol:
"""
:return: protocol id that stream runs on
"""
return self.protocol_id
def set_protocol(self, protocol_id: TProtocol) -> None:
"""
:param protocol_id: protocol id that stream runs on
"""
self.protocol_id = protocol_id
async def read(self, n: int = None) -> bytes:
"""
reads from stream.
:param n: number of bytes to read
:return: bytes of input
"""
try:
return await self.muxed_stream.read(n)
except MuxedStreamEOF as error:
raise StreamEOF() from error
except MuxedStreamReset as error:
raise StreamReset() from error
async def write(self, data: bytes) -> None:
"""
write to stream.
:return: number of bytes written
"""
try:
await self.muxed_stream.write(data)
except MuxedStreamClosed as error:
raise StreamClosed() from error
async def close(self) -> None:
"""close stream."""
await self.muxed_stream.close()
async def reset(self) -> None:
await self.muxed_stream.reset()
# TODO: `remove`: Called by close and write when the stream is in specific states.
# It notifies `ClosedStream` after `SwarmConn.remove_stream` is called.
# Reference: https://github.com/libp2p/go-libp2p-swarm/blob/99831444e78c8f23c9335c17d8f7c700ba25ca14/swarm_stream.go # noqa: E501