107 lines
3.6 KiB
Python
107 lines
3.6 KiB
Python
import logging
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from typing import Awaitable, Callable, List, Sequence, Tuple
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from multiaddr import Multiaddr
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import trio
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from trio_typing import TaskStatus
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from libp2p.io.trio import TrioTCPStream
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from libp2p.network.connection.raw_connection import RawConnection
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from libp2p.network.connection.raw_connection_interface import IRawConnection
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from libp2p.transport.exceptions import OpenConnectionError
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from libp2p.transport.listener_interface import IListener
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from libp2p.transport.transport_interface import ITransport
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from libp2p.transport.typing import THandler
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logger = logging.getLogger("libp2p.transport.tcp")
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class TCPListener(IListener):
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listeners: List[trio.SocketListener]
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def __init__(self, handler_function: THandler) -> None:
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self.listeners = []
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self.handler = handler_function
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# TODO: Get rid of `nursery`?
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async def listen(self, maddr: Multiaddr, nursery: trio.Nursery) -> None:
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"""
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put listener in listening mode and wait for incoming connections.
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:param maddr: maddr of peer
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:return: return True if successful
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"""
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async def serve_tcp(
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handler: Callable[[trio.SocketStream], Awaitable[None]],
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port: int,
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host: str,
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task_status: TaskStatus[Sequence[trio.SocketListener]] = None,
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) -> None:
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"""Just a proxy function to add logging here."""
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logger.debug("serve_tcp %s %s", host, port)
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await trio.serve_tcp(handler, port, host=host, task_status=task_status)
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async def handler(stream: trio.SocketStream) -> None:
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tcp_stream = TrioTCPStream(stream)
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await self.handler(tcp_stream)
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listeners = await nursery.start(
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serve_tcp,
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handler,
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int(maddr.value_for_protocol("tcp")),
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maddr.value_for_protocol("ip4"),
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)
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self.listeners.extend(listeners)
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def get_addrs(self) -> Tuple[Multiaddr, ...]:
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"""
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retrieve list of addresses the listener is listening on.
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:return: return list of addrs
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"""
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return tuple(
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_multiaddr_from_socket(listener.socket) for listener in self.listeners
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)
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async def close(self) -> None:
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async with trio.open_nursery() as nursery:
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for listener in self.listeners:
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nursery.start_soon(listener.aclose)
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class TCP(ITransport):
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async def dial(self, maddr: Multiaddr) -> IRawConnection:
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"""
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dial a transport to peer listening on multiaddr.
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:param maddr: multiaddr of peer
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:return: `RawConnection` if successful
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:raise OpenConnectionError: raised when failed to open connection
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"""
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self.host = maddr.value_for_protocol("ip4")
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self.port = int(maddr.value_for_protocol("tcp"))
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try:
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stream = await trio.open_tcp_stream(self.host, self.port)
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except OSError as error:
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raise OpenConnectionError from error
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read_write_closer = TrioTCPStream(stream)
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return RawConnection(read_write_closer, True)
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def create_listener(self, handler_function: THandler) -> TCPListener:
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"""
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create listener on transport.
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:param handler_function: a function called when a new connection is received
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that takes a connection as argument which implements interface-connection
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:return: a listener object that implements listener_interface.py
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"""
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return TCPListener(handler_function)
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def _multiaddr_from_socket(socket: trio.socket.SocketType) -> Multiaddr:
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ip, port = socket.getsockname()
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return Multiaddr(f"/ip4/{ip}/tcp/{port}")
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