138 lines
4.3 KiB
Python
138 lines
4.3 KiB
Python
import asyncio
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from libp2p.stream_muxer.abc import IMuxedConn, IMuxedStream
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from .constants import HeaderTags
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class MplexStream(IMuxedStream):
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"""
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reference: https://github.com/libp2p/go-mplex/blob/master/stream.go
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"""
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stream_id: int
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initiator: bool
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mplex_conn: IMuxedConn
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read_deadline: int
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write_deadline: int
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local_closed: bool
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remote_closed: bool
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stream_lock: asyncio.Lock
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def __init__(self, stream_id: int, initiator: bool, mplex_conn: IMuxedConn) -> None:
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"""
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create new MuxedStream in muxer
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:param stream_id: stream stream id
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:param initiator: boolean if this is an initiator
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:param mplex_conn: muxed connection of this muxed_stream
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"""
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self.stream_id = stream_id
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self.initiator = initiator
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self.mplex_conn = mplex_conn
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self.read_deadline = None
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self.write_deadline = None
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self.local_closed = False
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self.remote_closed = False
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self.stream_lock = asyncio.Lock()
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async def read(self) -> bytes:
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"""
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read messages associated with stream from buffer til end of file
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:return: bytes of input
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"""
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return await self.mplex_conn.read_buffer(self.stream_id)
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async def write(self, data: bytes) -> int:
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"""
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write to stream
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:return: number of bytes written
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"""
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flag = (
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HeaderTags.MessageInitiator
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if self.initiator
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else HeaderTags.MessageReceiver
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)
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return await self.mplex_conn.send_message(flag, data, self.stream_id)
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async def close(self) -> bool:
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"""
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Closing a stream closes it for writing and closes the remote end for reading
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but allows writing in the other direction.
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:return: true if successful
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"""
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# TODO error handling with timeout
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# TODO understand better how mutexes are used from go repo
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flag = HeaderTags.CloseInitiator if self.initiator else HeaderTags.CloseReceiver
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await self.mplex_conn.send_message(flag, None, self.stream_id)
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remote_lock = False
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async with self.stream_lock:
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if self.local_closed:
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return True
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self.local_closed = True
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remote_lock = self.remote_closed
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if remote_lock:
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# FIXME: mplex_conn has no conn_lock!
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async with self.mplex_conn.conn_lock: # type: ignore
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# FIXME: Don't access to buffers directly
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self.mplex_conn.buffers.pop(self.stream_id) # type: ignore
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return True
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async def reset(self) -> bool:
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"""
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closes both ends of the stream
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tells this remote side to hang up
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:return: true if successful
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"""
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# TODO understand better how mutexes are used here
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# TODO understand the difference between close and reset
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async with self.stream_lock:
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if self.remote_closed and self.local_closed:
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return True
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if not self.remote_closed:
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flag = (
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HeaderTags.ResetInitiator
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if self.initiator
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else HeaderTags.ResetInitiator
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)
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await self.mplex_conn.send_message(flag, None, self.stream_id)
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self.local_closed = True
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self.remote_closed = True
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# FIXME: mplex_conn has no conn_lock!
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async with self.mplex_conn.conn_lock: # type: ignore
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# FIXME: Don't access to buffers directly
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self.mplex_conn.buffers.pop(self.stream_id, None) # type: ignore
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return True
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# TODO deadline not in use
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def set_deadline(self, ttl: int) -> bool:
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"""
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set deadline for muxed stream
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:return: True if successful
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"""
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self.read_deadline = ttl
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self.write_deadline = ttl
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return True
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def set_read_deadline(self, ttl: int) -> bool:
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"""
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set read deadline for muxed stream
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:return: True if successful
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"""
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self.read_deadline = ttl
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return True
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def set_write_deadline(self, ttl: int) -> bool:
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"""
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set write deadline for muxed stream
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:return: True if successful
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"""
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self.write_deadline = ttl
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return True
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