py-libp2p/libp2p/tools/utils.py

from typing import Dict, Sequence, Tuple, cast

import multiaddr

from libp2p import new_node
from libp2p.host.basic_host import BasicHost
from libp2p.host.host_interface import IHost
from libp2p.host.routed_host import RoutedHost
from libp2p.network.stream.net_stream_interface import INetStream
from libp2p.network.swarm import Swarm
from libp2p.peer.id import ID
from libp2p.peer.peerinfo import PeerInfo, info_from_p2p_addr
from libp2p.routing.interfaces import IPeerRouting
from libp2p.typing import StreamHandlerFn, TProtocol

from .constants import MAX_READ_LEN


async def connect_swarm(swarm_0: Swarm, swarm_1: Swarm) -> None:
    peer_id = swarm_1.get_peer_id()
    addrs = tuple(
        addr
        for transport in swarm_1.listeners.values()
        for addr in transport.get_addrs()
    )
    swarm_0.peerstore.add_addrs(peer_id, addrs, 10000)
    await swarm_0.dial_peer(peer_id)
    assert swarm_0.get_peer_id() in swarm_1.connections
    assert swarm_1.get_peer_id() in swarm_0.connections


async def connect(node1: IHost, node2: IHost) -> None:
    """Connect node1 to node2."""
    addr = node2.get_addrs()[0]
    info = info_from_p2p_addr(addr)
    await node1.connect(info)


async def set_up_nodes_by_transport_opt(
    transport_opt_list: Sequence[Sequence[str]]
) -> Tuple[BasicHost, ...]:
    nodes_list = []
    for transport_opt in transport_opt_list:
        node = await new_node(transport_opt=transport_opt)
        await node.get_network().listen(multiaddr.Multiaddr(transport_opt[0]))
        nodes_list.append(node)
    return tuple(nodes_list)


async def echo_stream_handler(stream: INetStream) -> None:
    while True:
        read_string = (await stream.read(MAX_READ_LEN)).decode()

        resp = "ack:" + read_string
        await stream.write(resp.encode())


async def perform_two_host_set_up(
    handler: StreamHandlerFn = echo_stream_handler
) -> Tuple[BasicHost, BasicHost]:
    transport_opt_list = [["/ip4/127.0.0.1/tcp/0"], ["/ip4/127.0.0.1/tcp/0"]]
    (node_a, node_b) = await set_up_nodes_by_transport_opt(transport_opt_list)

    node_b.set_stream_handler(TProtocol("/echo/1.0.0"), handler)

    # Associate the peer with local ip address (see default parameters of Libp2p())
    node_a.get_peerstore().add_addrs(node_b.get_id(), node_b.get_addrs(), 10)
    return node_a, node_b


class DummyRouter(IPeerRouting):
    _routing_table: Dict[ID, PeerInfo]

    def __init__(self) -> None:
        self._routing_table = dict()

    async def find_peer(self, peer_id: ID) -> PeerInfo:
        return self._routing_table.get(peer_id, None)


async def set_up_routed_hosts() -> Tuple[RoutedHost, RoutedHost]:
    router_a, router_b = DummyRouter(), DummyRouter()
    transport = "/ip4/127.0.0.1/tcp/0"
    host_a = await new_node(transport_opt=[transport], disc_opt=router_a)
    host_b = await new_node(transport_opt=[transport], disc_opt=router_b)

    address = multiaddr.Multiaddr(transport)
    await host_a.get_network().listen(address)
    await host_b.get_network().listen(address)

    mock_routing_table = {
        host_a.get_id(): PeerInfo(host_a.get_id(), host_a.get_addrs()),
        host_b.get_id(): PeerInfo(host_b.get_id(), host_b.get_addrs()),
    }

    router_a._routing_table = router_b._routing_table = mock_routing_table

    return cast(RoutedHost, host_a), cast(RoutedHost, host_b)