101 lines
3.4 KiB
Python
101 lines
3.4 KiB
Python
from typing import TYPE_CHECKING, Set, Tuple
|
|
|
|
import trio
|
|
|
|
from libp2p.network.connection.net_connection_interface import INetConn
|
|
from libp2p.network.stream.net_stream import NetStream
|
|
from libp2p.stream_muxer.abc import IMuxedConn, IMuxedStream
|
|
from libp2p.stream_muxer.exceptions import MuxedConnUnavailable
|
|
|
|
if TYPE_CHECKING:
|
|
from libp2p.network.swarm import Swarm # noqa: F401
|
|
|
|
|
|
"""
|
|
Reference: https://github.com/libp2p/go-libp2p-swarm/blob/04c86bbdafd390651cb2ee14e334f7caeedad722/swarm_conn.go # noqa: E501
|
|
"""
|
|
|
|
|
|
class SwarmConn(INetConn):
|
|
muxed_conn: IMuxedConn
|
|
swarm: "Swarm"
|
|
streams: Set[NetStream]
|
|
event_closed: trio.Event
|
|
|
|
def __init__(self, muxed_conn: IMuxedConn, swarm: "Swarm") -> None:
|
|
self.muxed_conn = muxed_conn
|
|
self.swarm = swarm
|
|
self.streams = set()
|
|
self.event_closed = trio.Event()
|
|
self.event_started = trio.Event()
|
|
|
|
@property
|
|
def is_closed(self) -> bool:
|
|
return self.event_closed.is_set()
|
|
|
|
async def close(self) -> None:
|
|
if self.event_closed.is_set():
|
|
return
|
|
self.event_closed.set()
|
|
await self._cleanup()
|
|
|
|
async def _cleanup(self) -> None:
|
|
self.swarm.remove_conn(self)
|
|
|
|
await self.muxed_conn.close()
|
|
|
|
# This is just for cleaning up state. The connection has already been closed.
|
|
# We *could* optimize this but it really isn't worth it.
|
|
for stream in self.streams.copy():
|
|
await stream.reset()
|
|
# Force context switch for stream handlers to process the stream reset event we just emit
|
|
# before we cancel the stream handler tasks.
|
|
await trio.sleep(0.1)
|
|
|
|
await self._notify_disconnected()
|
|
|
|
async def _handle_new_streams(self) -> None:
|
|
self.event_started.set()
|
|
async with trio.open_nursery() as nursery:
|
|
while True:
|
|
try:
|
|
stream = await self.muxed_conn.accept_stream()
|
|
except MuxedConnUnavailable:
|
|
await self.close()
|
|
break
|
|
# Asynchronously handle the accepted stream, to avoid blocking the next stream.
|
|
nursery.start_soon(self._handle_muxed_stream, stream)
|
|
|
|
async def _handle_muxed_stream(self, muxed_stream: IMuxedStream) -> None:
|
|
net_stream = await self._add_stream(muxed_stream)
|
|
try:
|
|
# Ignore type here since mypy complains: https://github.com/python/mypy/issues/2427
|
|
await self.swarm.common_stream_handler(net_stream) # type: ignore
|
|
finally:
|
|
# As long as `common_stream_handler`, remove the stream.
|
|
self.remove_stream(net_stream)
|
|
|
|
async def _add_stream(self, muxed_stream: IMuxedStream) -> NetStream:
|
|
net_stream = NetStream(muxed_stream)
|
|
self.streams.add(net_stream)
|
|
await self.swarm.notify_opened_stream(net_stream)
|
|
return net_stream
|
|
|
|
async def _notify_disconnected(self) -> None:
|
|
await self.swarm.notify_disconnected(self)
|
|
|
|
async def start(self) -> None:
|
|
await self._handle_new_streams()
|
|
|
|
async def new_stream(self) -> NetStream:
|
|
muxed_stream = await self.muxed_conn.open_stream()
|
|
return await self._add_stream(muxed_stream)
|
|
|
|
def get_streams(self) -> Tuple[NetStream, ...]:
|
|
return tuple(self.streams)
|
|
|
|
def remove_stream(self, stream: NetStream) -> None:
|
|
if stream not in self.streams:
|
|
return
|
|
self.streams.remove(stream)
|