112 lines
3.9 KiB
Python
112 lines
3.9 KiB
Python
import asyncio
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from typing import TYPE_CHECKING, Any, Awaitable, List, Set, Tuple
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from libp2p.network.connection.net_connection_interface import INetConn
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from libp2p.network.stream.net_stream import NetStream
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from libp2p.stream_muxer.abc import IMuxedConn, IMuxedStream
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from libp2p.stream_muxer.exceptions import MuxedConnUnavailable
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if TYPE_CHECKING:
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from libp2p.network.swarm import Swarm # noqa: F401
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"""
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Reference: https://github.com/libp2p/go-libp2p-swarm/blob/04c86bbdafd390651cb2ee14e334f7caeedad722/swarm_conn.go # noqa: E501
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"""
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class SwarmConn(INetConn):
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muxed_conn: IMuxedConn
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swarm: "Swarm"
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streams: Set[NetStream]
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event_closed: asyncio.Event
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_tasks: List["asyncio.Future[Any]"]
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def __init__(self, muxed_conn: IMuxedConn, swarm: "Swarm") -> None:
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self.muxed_conn = muxed_conn
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self.swarm = swarm
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self.streams = set()
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self.event_closed = asyncio.Event()
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self._tasks = []
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async def close(self) -> None:
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if self.event_closed.is_set():
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return
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self.event_closed.set()
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self.swarm.remove_conn(self)
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await self.muxed_conn.close()
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# This is just for cleaning up state. The connection has already been closed.
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# We *could* optimize this but it really isn't worth it.
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for stream in self.streams:
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await stream.reset()
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# Force context switch for stream handlers to process the stream reset event we just emit
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# before we cancel the stream handler tasks.
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await asyncio.sleep(0.1)
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for task in self._tasks:
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task.cancel()
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try:
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await task
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except asyncio.CancelledError:
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pass
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# Schedule `self._notify_disconnected` to make it execute after `close` is finished.
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self._notify_disconnected()
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async def _handle_new_streams(self) -> None:
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while True:
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try:
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stream = await self.muxed_conn.accept_stream()
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except MuxedConnUnavailable:
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# If there is anything wrong in the MuxedConn,
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# we should break the loop and close the connection.
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break
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# Asynchronously handle the accepted stream, to avoid blocking the next stream.
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await self.run_task(self._handle_muxed_stream(stream))
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await self.close()
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async def _call_stream_handler(self, net_stream: NetStream) -> None:
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try:
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await self.swarm.common_stream_handler(net_stream)
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# TODO: More exact exceptions
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except Exception:
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# TODO: Emit logs.
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# TODO: Clean up and remove the stream from SwarmConn if there is anything wrong.
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self.remove_stream(net_stream)
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async def _handle_muxed_stream(self, muxed_stream: IMuxedStream) -> None:
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net_stream = self._add_stream(muxed_stream)
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if self.swarm.common_stream_handler is not None:
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await self.run_task(self._call_stream_handler(net_stream))
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def _add_stream(self, muxed_stream: IMuxedStream) -> NetStream:
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net_stream = NetStream(muxed_stream)
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self.streams.add(net_stream)
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self.swarm.notify_opened_stream(net_stream)
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return net_stream
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def _notify_disconnected(self) -> None:
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self.swarm.notify_disconnected(self)
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async def start(self) -> None:
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await self.run_task(self._handle_new_streams())
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async def run_task(self, coro: Awaitable[Any]) -> None:
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self._tasks.append(asyncio.ensure_future(coro))
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async def new_stream(self) -> NetStream:
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muxed_stream = await self.muxed_conn.open_stream()
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return self._add_stream(muxed_stream)
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async def get_streams(self) -> Tuple[NetStream, ...]:
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return tuple(self.streams)
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def remove_stream(self, stream: NetStream) -> None:
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if stream not in self.streams:
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return
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self.streams.remove(stream)
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