forked from LBRYCommunity/lbry-sdk
199 lines
8.7 KiB
Python
199 lines
8.7 KiB
Python
import typing
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import asyncio
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import logging
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import ipaddress
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from binascii import hexlify
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from dataclasses import dataclass, field
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from functools import lru_cache
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from lbry.dht import constants
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from lbry.dht.serialization.datagram import make_compact_address, make_compact_ip, decode_compact_address
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log = logging.getLogger(__name__)
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@lru_cache(1024)
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def make_kademlia_peer(node_id: typing.Optional[bytes], address: typing.Optional[str],
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udp_port: typing.Optional[int] = None,
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tcp_port: typing.Optional[int] = None,
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allow_localhost: bool = False) -> 'KademliaPeer':
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return KademliaPeer(address, node_id, udp_port, tcp_port=tcp_port, allow_localhost=allow_localhost)
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# the ipaddress module does not show these subnets as reserved
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CARRIER_GRADE_NAT_SUBNET = ipaddress.ip_network('100.64.0.0/10')
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IPV4_TO_6_RELAY_SUBNET = ipaddress.ip_network('192.88.99.0/24')
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ALLOW_LOCALHOST = False
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def is_valid_public_ipv4(address, allow_localhost: bool = False):
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allow_localhost = bool(allow_localhost or ALLOW_LOCALHOST)
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try:
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parsed_ip = ipaddress.ip_address(address)
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if parsed_ip.is_loopback and allow_localhost:
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return True
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if any((parsed_ip.version != 4, parsed_ip.is_unspecified, parsed_ip.is_link_local, parsed_ip.is_loopback,
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parsed_ip.is_multicast, parsed_ip.is_reserved, parsed_ip.is_private, parsed_ip.is_reserved)):
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return False
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else:
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return not any((CARRIER_GRADE_NAT_SUBNET.supernet_of(ipaddress.ip_network(f"{address}/32")),
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IPV4_TO_6_RELAY_SUBNET.supernet_of(ipaddress.ip_network(f"{address}/32"))))
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except ipaddress.AddressValueError:
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return False
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class PeerManager:
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def __init__(self, loop: asyncio.AbstractEventLoop):
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self._loop = loop
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self._rpc_failures: typing.Dict[
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typing.Tuple[str, int], typing.Tuple[typing.Optional[float], typing.Optional[float]]
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] = {}
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self._last_replied: typing.Dict[typing.Tuple[str, int], float] = {}
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self._last_sent: typing.Dict[typing.Tuple[str, int], float] = {}
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self._last_requested: typing.Dict[typing.Tuple[str, int], float] = {}
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self._node_id_mapping: typing.Dict[typing.Tuple[str, int], bytes] = {}
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self._node_id_reverse_mapping: typing.Dict[bytes, typing.Tuple[str, int]] = {}
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self._node_tokens: typing.Dict[bytes, (float, bytes)] = {}
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def reset(self):
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for statistic in (self._rpc_failures, self._last_replied, self._last_sent, self._last_requested):
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statistic.clear()
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def report_failure(self, address: str, udp_port: int):
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now = self._loop.time()
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_, previous = self._rpc_failures.pop((address, udp_port), (None, None))
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self._rpc_failures[(address, udp_port)] = (previous, now)
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def report_last_sent(self, address: str, udp_port: int):
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now = self._loop.time()
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self._last_sent[(address, udp_port)] = now
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def report_last_replied(self, address: str, udp_port: int):
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now = self._loop.time()
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self._last_replied[(address, udp_port)] = now
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def report_last_requested(self, address: str, udp_port: int):
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now = self._loop.time()
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self._last_requested[(address, udp_port)] = now
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def clear_token(self, node_id: bytes):
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self._node_tokens.pop(node_id, None)
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def update_token(self, node_id: bytes, token: bytes):
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now = self._loop.time()
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self._node_tokens[node_id] = (now, token)
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def get_node_token(self, node_id: bytes) -> typing.Optional[bytes]:
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ts, token = self._node_tokens.get(node_id, (0, None))
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if ts and ts > self._loop.time() - constants.TOKEN_SECRET_REFRESH_INTERVAL:
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return token
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def get_last_replied(self, address: str, udp_port: int) -> typing.Optional[float]:
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return self._last_replied.get((address, udp_port))
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def update_contact_triple(self, node_id: bytes, address: str, udp_port: int):
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"""
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Update the mapping of node_id -> address tuple and that of address tuple -> node_id
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This is to handle peers changing addresses and ids while assuring that the we only ever have
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one node id / address tuple mapped to each other
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"""
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if (address, udp_port) in self._node_id_mapping:
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self._node_id_reverse_mapping.pop(self._node_id_mapping.pop((address, udp_port)))
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if node_id in self._node_id_reverse_mapping:
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self._node_id_mapping.pop(self._node_id_reverse_mapping.pop(node_id))
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self._node_id_mapping[(address, udp_port)] = node_id
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self._node_id_reverse_mapping[node_id] = (address, udp_port)
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def prune(self): # TODO: periodically call this
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now = self._loop.time()
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to_pop = []
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for (address, udp_port), (_, last_failure) in self._rpc_failures.items():
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if last_failure and last_failure < now - constants.RPC_ATTEMPTS_PRUNING_WINDOW:
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to_pop.append((address, udp_port))
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while to_pop:
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del self._rpc_failures[to_pop.pop()]
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to_pop = []
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for node_id, (age, token) in self._node_tokens.items(): # pylint: disable=unused-variable
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if age < now - constants.TOKEN_SECRET_REFRESH_INTERVAL:
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to_pop.append(node_id)
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while to_pop:
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del self._node_tokens[to_pop.pop()]
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def contact_triple_is_good(self, node_id: bytes, address: str, udp_port: int): # pylint: disable=too-many-return-statements
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"""
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:return: False if peer is bad, None if peer is unknown, or True if peer is good
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"""
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delay = self._loop.time() - constants.CHECK_REFRESH_INTERVAL
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# fixme: find a way to re-enable that without breaking other parts
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# if node_id not in self._node_id_reverse_mapping or (address, udp_port) not in self._node_id_mapping:
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# return
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# addr_tup = (address, udp_port)
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# if self._node_id_reverse_mapping[node_id] != addr_tup or self._node_id_mapping[addr_tup] != node_id:
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# return
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previous_failure, most_recent_failure = self._rpc_failures.get((address, udp_port), (None, None))
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last_requested = self._last_requested.get((address, udp_port))
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last_replied = self._last_replied.get((address, udp_port))
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if node_id is None:
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return None
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if most_recent_failure and last_replied:
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if delay < last_replied > most_recent_failure:
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return True
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elif last_replied > most_recent_failure:
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return
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return False
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elif previous_failure and most_recent_failure and most_recent_failure > delay:
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return False
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elif last_replied and last_replied > delay:
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return True
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elif last_requested and last_requested > delay:
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return None
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return
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def peer_is_good(self, peer: 'KademliaPeer'):
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return self.contact_triple_is_good(peer.node_id, peer.address, peer.udp_port)
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def decode_tcp_peer_from_compact_address(self, compact_address: bytes) -> 'KademliaPeer': # pylint: disable=no-self-use
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node_id, address, tcp_port = decode_compact_address(compact_address)
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return make_kademlia_peer(node_id, address, udp_port=None, tcp_port=tcp_port)
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@dataclass(unsafe_hash=True)
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class KademliaPeer:
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address: str = field(hash=True)
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_node_id: typing.Optional[bytes] = field(hash=True)
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udp_port: typing.Optional[int] = field(hash=True)
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tcp_port: typing.Optional[int] = field(compare=False, hash=False)
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protocol_version: typing.Optional[int] = field(default=1, compare=False, hash=False)
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allow_localhost: bool = field(default=False, compare=False, hash=False)
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def __post_init__(self):
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if self._node_id is not None:
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if not len(self._node_id) == constants.HASH_LENGTH:
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raise ValueError("invalid node_id: {}".format(hexlify(self._node_id).decode()))
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if self.udp_port is not None and not 1 <= self.udp_port <= 65535:
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raise ValueError("invalid udp port")
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if self.tcp_port is not None and not 1 <= self.tcp_port <= 65535:
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raise ValueError("invalid tcp port")
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if not is_valid_public_ipv4(self.address, self.allow_localhost):
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raise ValueError(f"invalid ip address: '{self.address}'")
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def update_tcp_port(self, tcp_port: int):
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self.tcp_port = tcp_port
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@property
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def node_id(self) -> bytes:
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return self._node_id
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def compact_address_udp(self) -> bytearray:
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return make_compact_address(self.node_id, self.address, self.udp_port)
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def compact_address_tcp(self) -> bytearray:
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return make_compact_address(self.node_id, self.address, self.tcp_port)
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def compact_ip(self):
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return make_compact_ip(self.address)
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