88 lines
2.9 KiB
Python
88 lines
2.9 KiB
Python
import asyncio
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from socket import socket
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from typing import List
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from multiaddr import Multiaddr
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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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class TCPListener(IListener):
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multiaddrs: List[Multiaddr]
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server = None
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def __init__(self, handler_function: THandler) -> None:
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self.multiaddrs = []
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self.server = None
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self.handler = handler_function
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async def listen(self, maddr: Multiaddr) -> bool:
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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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self.server = await asyncio.start_server(
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self.handler,
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maddr.value_for_protocol("ip4"),
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maddr.value_for_protocol("tcp"),
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)
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socket = self.server.sockets[0]
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self.multiaddrs.append(_multiaddr_from_socket(socket))
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return True
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def get_addrs(self) -> List[Multiaddr]:
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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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# TODO check if server is listening
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return self.multiaddrs
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async def close(self) -> None:
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"""close the listener such that no more connections can be open on this
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transport instance."""
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if self.server is None:
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return
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self.server.close()
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await self.server.wait_closed()
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self.server = None
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class TCP(ITransport):
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async def dial(self, maddr: Multiaddr) -> IRawConnection:
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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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reader, writer = await asyncio.open_connection(self.host, self.port)
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except (ConnectionAbortedError, ConnectionRefusedError) as error:
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raise OpenConnectionError(error)
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return RawConnection(reader, writer, True)
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def create_listener(self, handler_function: THandler) -> TCPListener:
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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: socket) -> Multiaddr:
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return Multiaddr("/ip4/%s/tcp/%s" % socket.getsockname())
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