247 lines
12 KiB
Python
247 lines
12 KiB
Python
import logging
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import asyncio
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import typing
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import binascii
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import contextlib
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from lbrynet.utils import resolve_host
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from lbrynet.dht import constants
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from lbrynet.dht.error import RemoteException
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from lbrynet.dht.protocol.async_generator_junction import AsyncGeneratorJunction
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from lbrynet.dht.protocol.distance import Distance
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from lbrynet.dht.protocol.iterative_find import IterativeNodeFinder, IterativeValueFinder
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from lbrynet.dht.protocol.protocol import KademliaProtocol
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from lbrynet.dht.peer import KademliaPeer
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if typing.TYPE_CHECKING:
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from lbrynet.dht.peer import PeerManager
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log = logging.getLogger(__name__)
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class Node:
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def __init__(self, loop: asyncio.BaseEventLoop, 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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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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async def refresh_node(self):
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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 announed blobs to us
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total_peers.extend(self.protocol.data_store.get_storing_contacts())
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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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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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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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announced_to_node_ids = []
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while not announced_to_node_ids:
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hash_value = binascii.unhexlify(blob_hash.encode())
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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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announced_to_node_ids.extend([node_id for node_id, contacted in stored_to_tup if contacted])
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log.info("Stored %s to %i of %i attempted peers", binascii.hexlify(hash_value).decode()[:8],
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len(announced_to_node_ids), len(peers))
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return announced_to_node_ids
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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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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 = '') -> 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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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: typing.Optional[str] = '',
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known_node_urls: typing.Optional[typing.List[typing.Tuple[str, int]]] = None):
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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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# resolve the known node urls
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known_node_addresses = []
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url_to_addr = {}
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if known_node_urls:
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for host, port in known_node_urls:
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address = await resolve_host(host, port, proto='udp')
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if (address, port) not in known_node_addresses and address != self.protocol.external_ip:
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known_node_addresses.append((address, port))
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url_to_addr[address] = host
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if known_node_addresses:
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while not self.protocol.routing_table.get_peers():
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success = False
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# ping the seed nodes, this will set their node ids (since we don't know them ahead of time)
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for address, port in known_node_addresses:
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peer = self.protocol.get_rpc_peer(KademliaPeer(self.loop, address, udp_port=port))
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try:
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await peer.ping()
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success = True
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except asyncio.TimeoutError:
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log.warning("seed node (%s:%i) timed out in %s", url_to_addr.get(address, address), port,
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round(self.protocol.rpc_timeout, 2))
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if success:
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break
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# now that we have the seed nodes in routing, to an iterative lookup of our own id to populate the buckets
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# in the routing table with good peers who are near us
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async with self.peer_search_junction(self.protocol.node_id, max_results=16) as junction:
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async for peers in junction:
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for peer in peers:
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try:
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await self.protocol.get_rpc_peer(peer).ping()
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except (asyncio.TimeoutError, RemoteException):
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pass
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log.info("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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self.joined.set()
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def start(self, interface: str, known_node_urls: typing.List[typing.Tuple[str, int]]):
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self._join_task = self.loop.create_task(
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self.join_network(
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interface=interface, known_node_urls=known_node_urls
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)
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)
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def get_iterative_node_finder(self, key: bytes, shortlist: typing.Optional[typing.List] = 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] = 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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@contextlib.asynccontextmanager
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async def stream_peer_search_junction(self, hash_queue: asyncio.Queue, bottom_out_limit=20,
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max_results=-1) -> AsyncGeneratorJunction:
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peer_generator = AsyncGeneratorJunction(self.loop)
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async def _add_hashes_from_queue():
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while True:
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blob_hash = await hash_queue.get()
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peer_generator.add_generator(
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self.get_iterative_value_finder(
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binascii.unhexlify(blob_hash.encode()), bottom_out_limit=bottom_out_limit,
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max_results=max_results
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)
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)
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add_hashes_task = self.loop.create_task(_add_hashes_from_queue())
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try:
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async with peer_generator as junction:
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yield junction
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await peer_generator.finished.wait()
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finally:
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if add_hashes_task and not (add_hashes_task.done() or add_hashes_task.cancelled()):
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add_hashes_task.cancel()
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def peer_search_junction(self, node_id: bytes, max_results=constants.k*2,
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bottom_out_limit=20) -> AsyncGeneratorJunction:
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peer_generator = AsyncGeneratorJunction(self.loop)
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peer_generator.add_generator(
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self.get_iterative_node_finder(
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node_id, bottom_out_limit=bottom_out_limit, max_results=max_results
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)
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)
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return peer_generator
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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) -> typing.List['KademliaPeer']:
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accumulated: typing.List['KademliaPeer'] = []
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async with self.peer_search_junction(node_id, max_results=max_results,
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bottom_out_limit=bottom_out_limit) as junction:
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async for peers in junction:
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accumulated.extend(peers)
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distance = Distance(node_id)
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accumulated.sort(key=lambda peer: distance(peer.node_id))
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return accumulated[:count]
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async def _accumulate_search_junction(self, search_queue: asyncio.Queue,
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result_queue: asyncio.Queue):
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async with self.stream_peer_search_junction(search_queue) as search_junction: # pylint: disable=E1701
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async for peers in search_junction:
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if peers:
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result_queue.put_nowait([
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peer for peer in peers
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if not (
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peer.address == self.protocol.external_ip
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and peer.tcp_port == self.protocol.peer_port
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)
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])
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def accumulate_peers(self, search_queue: asyncio.Queue,
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peer_queue: typing.Optional[asyncio.Queue] = None) -> typing.Tuple[
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asyncio.Queue, asyncio.Task]:
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q = peer_queue or asyncio.Queue()
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return q, asyncio.create_task(self._accumulate_search_junction(search_queue, q))
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