forked from LBRYCommunity/lbry-sdk
130 lines
5.1 KiB
Python
130 lines
5.1 KiB
Python
import logging
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import asyncio
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import time
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import typing
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import lbry.dht.error
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from lbry.dht.constants import generate_id
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from lbry.dht.node import Node
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from lbry.dht.peer import make_kademlia_peer, PeerManager
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from lbry.dht.protocol.distance import Distance
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from lbry.extras.daemon.storage import SQLiteStorage
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from lbry.conf import Config
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from lbry.utils import resolve_host
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logging.basicConfig(level=logging.INFO, format="%(asctime)s %(levelname)-4s %(name)s:%(lineno)d: %(message)s")
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log = logging.getLogger(__name__)
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def new_node(address="0.0.0.0", udp_port=4444, node_id=None):
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node_id = node_id or generate_id()
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loop = asyncio.get_event_loop()
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return Node(loop, PeerManager(loop), node_id, udp_port, udp_port, 3333, address)
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class Crawler:
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def __init__(self):
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self.node = new_node()
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self.crawled = set()
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self.known_peers = set()
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self.unreachable = set()
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self.error = set()
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self.semaphore = asyncio.Semaphore(10)
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async def request_peers(self, host, port, key) -> typing.List['KademliaPeer']:
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async with self.semaphore:
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peer = make_kademlia_peer(None, await resolve_host(host, port, 'udp'), port)
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for attempt in range(3):
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try:
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response = await self.node.protocol.get_rpc_peer(peer).find_node(key)
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return [make_kademlia_peer(*peer_tuple) for peer_tuple in response]
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except asyncio.TimeoutError:
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log.info('Previously responding peer timed out: %s:%d attempt #%d', host, port, (attempt + 1))
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continue
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except lbry.dht.error.RemoteException as e:
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log.info('Previously responding peer errored: %s:%d attempt #%d - %s',
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host, port, (attempt + 1), str(e))
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self.error.add((host, port))
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continue
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return []
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async def crawl_routing_table(self, host, port):
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start = time.time()
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log.info("querying %s:%d", host, port)
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self.known_peers.add((host, port))
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self.crawled.add((host, port))
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address = await resolve_host(host, port, 'udp')
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key = self.node.protocol.peer_manager.get_node_id_for_endpoint(address, port)
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if not key:
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for _ in range(3):
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try:
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async with self.semaphore:
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await self.node.protocol.get_rpc_peer(make_kademlia_peer(None, address, port)).ping()
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key = self.node.protocol.peer_manager.get_node_id_for_endpoint(address, port)
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except asyncio.TimeoutError:
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pass
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except lbry.dht.error.RemoteException:
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self.error.add((host, port))
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if not key:
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self.unreachable.add((host, port))
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return set()
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node_id = key
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distance = Distance(key)
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max_distance = int.from_bytes(bytes([0xff] * 48), 'big')
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peers = set()
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factor = 2048
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for i in range(200):
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#print(i, len(peers), key.hex(), host)
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new_peers = await self.request_peers(address, port, key)
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if not new_peers:
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break
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new_peers.sort(key=lambda peer: distance(peer.node_id))
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peers.update(new_peers)
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far_key = new_peers[-1].node_id
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if distance(far_key) <= distance(key):
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current_distance = distance(key)
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next_jump = current_distance + int(max_distance // factor) # jump closer
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factor /= 2
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if factor > 8 and next_jump < max_distance:
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key = int.from_bytes(node_id, 'big') ^ next_jump
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if key.bit_length() > 384:
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break
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key = key.to_bytes(48, 'big')
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else:
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break
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else:
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key = far_key
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factor = 2048
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log.info("Done querying %s:%d in %.2f seconds: %d peers found over %d requests.",
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host, port, (time.time() - start), len(peers), i)
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self.crawled.update(peers)
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return peers
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async def process(self):
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to_process = {}
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def submit(_peer):
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f = asyncio.ensure_future(self.crawl_routing_table(_peer.address, peer.udp_port))
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to_process[_peer] = f
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f.add_done_callback(lambda _: to_process.pop(_peer))
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while to_process or len(self.known_peers) < len(self.crawled):
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log.info("%d known, %d unreachable, %d error.. %d processing",
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len(self.known_peers), len(self.unreachable), len(self.error), len(to_process))
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for peer in self.crawled.difference(self.known_peers):
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self.known_peers.add(peer)
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submit(peer)
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await asyncio.wait(to_process.values(), return_when=asyncio.FIRST_COMPLETED)
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async def test():
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crawler = Crawler()
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await crawler.node.start_listening()
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conf = Config()
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for (host, port) in conf.known_dht_nodes:
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await crawler.crawl_routing_table(host, port)
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await crawler.process()
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if __name__ == '__main__':
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asyncio.run(test())
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