102 lines
3.3 KiB
Python
102 lines
3.3 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.peer.id import ID
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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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"""
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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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"""
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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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def close(self) -> bool:
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"""
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close the listener such that no more connections
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can be open on this transport instance
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:return: return True if successful
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"""
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if self.server is None:
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return False
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self.server.close()
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_loop = asyncio.get_event_loop()
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_loop.run_until_complete(self.server.wait_closed())
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_loop.close()
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self.server = None
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return True
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class TCP(ITransport):
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async def dial(self, maddr: Multiaddr, self_id: ID) -> 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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:param self_id: peer_id of the dialer (to send to receiver)
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:return: True if successful
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"""
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host = maddr.value_for_protocol("ip4")
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port = maddr.value_for_protocol("tcp")
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reader, writer = await asyncio.open_connection(host, int(port))
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# First: send our peer ID so receiver knows it
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writer.write(self_id.to_base58().encode())
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await writer.drain()
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# Await ack for peer id
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expected_ack_str = "received peer id"
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ack = (await reader.read(len(expected_ack_str))).decode()
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if ack != expected_ack_str:
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raise Exception("Receiver did not receive peer id")
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return RawConnection(host, port, reader, writer, 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: socket) -> Multiaddr:
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return Multiaddr("/ip4/%s/tcp/%s" % socket.getsockname())
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