280 lines
14 KiB
Python
280 lines
14 KiB
Python
import logging
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import asyncio
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import typing
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import socket
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from prometheus_client import Gauge
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from lbry.utils import resolve_host
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from lbry.dht import constants
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from lbry.dht.peer import make_kademlia_peer
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from lbry.dht.protocol.distance import Distance
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from lbry.dht.protocol.iterative_find import IterativeNodeFinder, IterativeValueFinder
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from lbry.dht.protocol.protocol import KademliaProtocol
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if typing.TYPE_CHECKING:
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from lbry.dht.peer import PeerManager
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from lbry.dht.peer import KademliaPeer
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log = logging.getLogger(__name__)
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class Node:
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storing_peers_metric = Gauge(
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"storing_peers", "Number of peers storing blobs announced to this node", namespace="dht_node",
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labelnames=("scope",),
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)
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def __init__(self, loop: asyncio.AbstractEventLoop, peer_manager: 'PeerManager', node_id: bytes, udp_port: int,
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internal_udp_port: int, peer_port: int, external_ip: str, rpc_timeout: float = constants.RPC_TIMEOUT,
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split_buckets_under_index: int = constants.SPLIT_BUCKETS_UNDER_INDEX,
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storage: typing.Optional['SQLiteStorage'] = None):
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self.loop = loop
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self.internal_udp_port = internal_udp_port
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self.protocol = KademliaProtocol(loop, peer_manager, node_id, external_ip, udp_port, peer_port, rpc_timeout,
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split_buckets_under_index)
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self.listening_port: asyncio.DatagramTransport = None
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self.joined = asyncio.Event(loop=self.loop)
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self._join_task: asyncio.Task = None
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self._refresh_task: asyncio.Task = None
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self._storage = storage
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@property
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def stored_blob_hashes(self):
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return self.protocol.data_store.keys()
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async def refresh_node(self, force_once=False):
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while True:
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# remove peers with expired blob announcements from the datastore
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self.protocol.data_store.removed_expired_peers()
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total_peers: typing.List['KademliaPeer'] = []
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# add all peers in the routing table
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total_peers.extend(self.protocol.routing_table.get_peers())
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# add all the peers who have announced blobs to us
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storing_peers = self.protocol.data_store.get_storing_contacts()
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self.storing_peers_metric.labels("global").set(len(storing_peers))
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total_peers.extend(storing_peers)
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# get ids falling in the midpoint of each bucket that hasn't been recently updated
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node_ids = self.protocol.routing_table.get_refresh_list(0, True)
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# if we have 3 or fewer populated buckets get two random ids in the range of each to try and
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# populate/split the buckets further
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buckets_with_contacts = self.protocol.routing_table.buckets_with_contacts()
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if buckets_with_contacts <= 3:
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for i in range(buckets_with_contacts):
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node_ids.append(self.protocol.routing_table.random_id_in_bucket_range(i))
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node_ids.append(self.protocol.routing_table.random_id_in_bucket_range(i))
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if self.protocol.routing_table.get_peers():
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# if we have node ids to look up, perform the iterative search until we have k results
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while node_ids:
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peers = await self.peer_search(node_ids.pop())
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total_peers.extend(peers)
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else:
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if force_once:
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break
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fut = asyncio.Future(loop=self.loop)
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self.loop.call_later(constants.REFRESH_INTERVAL // 4, fut.set_result, None)
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await fut
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continue
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# ping the set of peers; upon success/failure the routing able and last replied/failed time will be updated
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to_ping = [peer for peer in set(total_peers) if self.protocol.peer_manager.peer_is_good(peer) is not True]
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if to_ping:
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self.protocol.ping_queue.enqueue_maybe_ping(*to_ping, delay=0)
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if self._storage:
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await self._storage.save_kademlia_peers(self.protocol.routing_table.get_peers())
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if force_once:
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break
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fut = asyncio.Future(loop=self.loop)
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self.loop.call_later(constants.REFRESH_INTERVAL, fut.set_result, None)
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await fut
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async def announce_blob(self, blob_hash: str) -> typing.List[bytes]:
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hash_value = bytes.fromhex(blob_hash)
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assert len(hash_value) == constants.HASH_LENGTH
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peers = await self.peer_search(hash_value)
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if not self.protocol.external_ip:
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raise Exception("Cannot determine external IP")
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log.debug("Store to %i peers", len(peers))
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for peer in peers:
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log.debug("store to %s %s %s", peer.address, peer.udp_port, peer.tcp_port)
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stored_to_tup = await asyncio.gather(
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*(self.protocol.store_to_peer(hash_value, peer) for peer in peers), loop=self.loop
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)
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stored_to = [node_id for node_id, contacted in stored_to_tup if contacted]
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if stored_to:
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log.debug(
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"Stored %s to %i of %i attempted peers", hash_value.hex()[:8],
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len(stored_to), len(peers)
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)
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else:
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log.debug("Failed announcing %s, stored to 0 peers", blob_hash[:8])
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return stored_to
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def stop(self) -> None:
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if self.joined.is_set():
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self.joined.clear()
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if self._join_task:
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self._join_task.cancel()
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if self._refresh_task and not (self._refresh_task.done() or self._refresh_task.cancelled()):
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self._refresh_task.cancel()
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if self.protocol and self.protocol.ping_queue.running:
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self.protocol.ping_queue.stop()
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self.protocol.stop()
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if self.listening_port is not None:
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self.listening_port.close()
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self._join_task = None
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self.listening_port = None
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log.info("Stopped DHT node")
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async def start_listening(self, interface: str = '0.0.0.0') -> None:
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if not self.listening_port:
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self.listening_port, _ = await self.loop.create_datagram_endpoint(
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lambda: self.protocol, (interface, self.internal_udp_port)
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)
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log.info("DHT node listening on UDP %s:%i", interface, self.internal_udp_port)
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self.protocol.start()
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else:
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log.warning("Already bound to port %s", self.listening_port)
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async def join_network(self, interface: str = '0.0.0.0',
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known_node_urls: typing.Optional[typing.List[typing.Tuple[str, int]]] = None):
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def peers_from_urls(urls: typing.Optional[typing.List[typing.Tuple[bytes, str, int, int]]]):
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peer_addresses = []
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for node_id, address, udp_port, tcp_port in urls:
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if (node_id, address, udp_port, tcp_port) not in peer_addresses and \
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(address, udp_port) != (self.protocol.external_ip, self.protocol.udp_port):
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peer_addresses.append((node_id, address, udp_port, tcp_port))
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return [make_kademlia_peer(*peer_address) for peer_address in peer_addresses]
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if not self.listening_port:
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await self.start_listening(interface)
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self.protocol.ping_queue.start()
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self._refresh_task = self.loop.create_task(self.refresh_node())
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while True:
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if self.protocol.routing_table.get_peers():
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if not self.joined.is_set():
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self.joined.set()
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log.info(
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"joined dht, %i peers known in %i buckets", len(self.protocol.routing_table.get_peers()),
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self.protocol.routing_table.buckets_with_contacts()
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)
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else:
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if self.joined.is_set():
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self.joined.clear()
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seed_peers = peers_from_urls(
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await self._storage.get_persisted_kademlia_peers()
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) if self._storage else []
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if not seed_peers:
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try:
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seed_peers.extend(peers_from_urls([
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(None, await resolve_host(address, udp_port, 'udp'), udp_port, None)
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for address, udp_port in known_node_urls or []
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]))
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except socket.gaierror:
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await asyncio.sleep(30, loop=self.loop)
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continue
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self.protocol.peer_manager.reset()
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self.protocol.ping_queue.enqueue_maybe_ping(*seed_peers, delay=0.0)
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await self.peer_search(self.protocol.node_id, shortlist=seed_peers, count=32)
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await asyncio.sleep(1, loop=self.loop)
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def start(self, interface: str, known_node_urls: typing.Optional[typing.List[typing.Tuple[str, int]]] = None):
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self._join_task = self.loop.create_task(self.join_network(interface, known_node_urls))
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def get_iterative_node_finder(self, key: bytes, shortlist: typing.Optional[typing.List['KademliaPeer']] = None,
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bottom_out_limit: int = constants.BOTTOM_OUT_LIMIT,
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max_results: int = constants.K) -> IterativeNodeFinder:
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return IterativeNodeFinder(self.loop, self.protocol.peer_manager, self.protocol.routing_table, self.protocol,
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key, bottom_out_limit, max_results, None, shortlist)
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def get_iterative_value_finder(self, key: bytes, shortlist: typing.Optional[typing.List['KademliaPeer']] = None,
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bottom_out_limit: int = 40,
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max_results: int = -1) -> IterativeValueFinder:
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return IterativeValueFinder(self.loop, self.protocol.peer_manager, self.protocol.routing_table, self.protocol,
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key, bottom_out_limit, max_results, None, shortlist)
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async def peer_search(self, node_id: bytes, count=constants.K, max_results=constants.K * 2,
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bottom_out_limit=20, shortlist: typing.Optional[typing.List['KademliaPeer']] = None
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) -> typing.List['KademliaPeer']:
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peers = []
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async for iteration_peers in self.get_iterative_node_finder(
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node_id, shortlist=shortlist, bottom_out_limit=bottom_out_limit, max_results=max_results):
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peers.extend(iteration_peers)
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distance = Distance(node_id)
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peers.sort(key=lambda peer: distance(peer.node_id))
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return peers[:count]
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async def _accumulate_peers_for_value(self, search_queue: asyncio.Queue, result_queue: asyncio.Queue):
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tasks = []
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try:
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while True:
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blob_hash = await search_queue.get()
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tasks.append(self.loop.create_task(self._peers_for_value_producer(blob_hash, result_queue)))
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finally:
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for task in tasks:
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task.cancel()
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async def _peers_for_value_producer(self, blob_hash: str, result_queue: asyncio.Queue):
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async def put_into_result_queue_after_pong(_peer):
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try:
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await self.protocol.get_rpc_peer(_peer).ping()
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result_queue.put_nowait([_peer])
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log.debug("pong from %s:%i for %s", _peer.address, _peer.udp_port, blob_hash)
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except asyncio.TimeoutError:
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pass
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# prioritize peers who reply to a dht ping first
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# this minimizes attempting to make tcp connections that won't work later to dead or unreachable peers
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async for results in self.get_iterative_value_finder(bytes.fromhex(blob_hash)):
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to_put = []
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for peer in results:
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if peer.address == self.protocol.external_ip and self.protocol.peer_port == peer.tcp_port:
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continue
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is_good = self.protocol.peer_manager.peer_is_good(peer)
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if is_good:
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# the peer has replied recently over UDP, it can probably be reached on the TCP port
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to_put.append(peer)
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elif is_good is None:
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if not peer.udp_port:
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# TODO: use the same port for TCP and UDP
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# the udp port must be guessed
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# default to the ports being the same. if the TCP port appears to be <=0.48.0 default,
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# including on a network with several nodes, then assume the udp port is proportionately
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# based on a starting port of 4444
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udp_port_to_try = peer.tcp_port
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if 3400 > peer.tcp_port > 3332:
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udp_port_to_try = (peer.tcp_port - 3333) + 4444
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self.loop.create_task(put_into_result_queue_after_pong(
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make_kademlia_peer(peer.node_id, peer.address, udp_port_to_try, peer.tcp_port)
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))
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else:
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self.loop.create_task(put_into_result_queue_after_pong(peer))
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else:
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# the peer is known to be bad/unreachable, skip trying to connect to it over TCP
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log.debug("skip bad peer %s:%i for %s", peer.address, peer.tcp_port, blob_hash)
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if to_put:
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result_queue.put_nowait(to_put)
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def accumulate_peers(self, search_queue: asyncio.Queue,
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peer_queue: typing.Optional[asyncio.Queue] = None
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) -> typing.Tuple[asyncio.Queue, asyncio.Task]:
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queue = peer_queue or asyncio.Queue(loop=self.loop)
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return queue, self.loop.create_task(self._accumulate_peers_for_value(search_queue, queue))
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async def get_kademlia_peers_from_hosts(peer_list: typing.List[typing.Tuple[str, int]]) -> typing.List['KademliaPeer']:
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peer_address_list = [(await resolve_host(url, port, proto='tcp'), port) for url, port in peer_list]
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kademlia_peer_list = [make_kademlia_peer(None, address, None, tcp_port=port, allow_localhost=True)
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for address, port in peer_address_list]
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return kademlia_peer_list
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