py-libp2p/libp2p/network/connection/swarm_connection.py
2019-09-23 15:46:50 +08:00

109 lines
3.7 KiB
Python

import asyncio
from typing import TYPE_CHECKING, Any, Awaitable, List, Set, Tuple
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: asyncio.Event
_tasks: List["asyncio.Future[Any]"]
def __init__(self, muxed_conn: IMuxedConn, swarm: "Swarm") -> None:
self.muxed_conn = muxed_conn
self.swarm = swarm
self.streams = set()
self.event_closed = asyncio.Event()
self._tasks = []
async def close(self) -> None:
if self.event_closed.is_set():
return
self.event_closed.set()
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:
await stream.reset()
for task in self._tasks:
task.cancel()
try:
await task
except asyncio.CancelledError:
pass
# Schedule `self._notify_disconnected` to make it execute after `close` is finished.
self._notify_disconnected()
async def _handle_new_streams(self) -> None:
while True:
try:
stream = await self.muxed_conn.accept_stream()
except MuxedConnUnavailable:
# If there is anything wrong in the MuxedConn,
# we should break the loop and close the connection.
break
# Asynchronously handle the accepted stream, to avoid blocking the next stream.
await self.run_task(self._handle_muxed_stream(stream))
await self.close()
async def _call_stream_handler(self, net_stream: NetStream) -> None:
try:
await self.swarm.common_stream_handler(net_stream)
# TODO: More exact exceptions
except Exception:
# TODO: Emit logs.
# TODO: Clean up and remove the stream from SwarmConn if there is anything wrong.
self.remove_stream(net_stream)
async def _handle_muxed_stream(self, muxed_stream: IMuxedStream) -> None:
net_stream = self._add_stream(muxed_stream)
if self.swarm.common_stream_handler is not None:
await self.run_task(self._call_stream_handler(net_stream))
def _add_stream(self, muxed_stream: IMuxedStream) -> NetStream:
net_stream = NetStream(muxed_stream)
self.streams.add(net_stream)
self.swarm.notify_opened_stream(net_stream)
return net_stream
def _notify_disconnected(self) -> None:
self.swarm.notify_disconnected(self)
async def start(self) -> None:
await self.run_task(self._handle_new_streams())
async def run_task(self, coro: Awaitable[Any]) -> None:
self._tasks.append(asyncio.ensure_future(coro))
async def new_stream(self) -> NetStream:
muxed_stream = await self.muxed_conn.open_stream()
return self._add_stream(muxed_stream)
async 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)