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dht_crawler: store data

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Victor Shyba 2022-06-11 01:05:30 -03:00 committed by Victor Shyba
parent 2361e34541
commit 7ea88e7b31
1 changed files with 156 additions and 33 deletions
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169
scripts/dht_crawler.py
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@ -1,3 +1,4 @@
import datetime
import logging
import asyncio
import time
@ -8,13 +9,50 @@ from lbry.dht.constants import generate_id
from lbry.dht.node import Node
from lbry.dht.peer import make_kademlia_peer, PeerManager
from lbry.dht.protocol.distance import Distance
from lbry.extras.daemon.storage import SQLiteStorage
from lbry.extras.daemon.storage import SQLiteMixin
from lbry.conf import Config
from lbry.utils import resolve_host
from sqlalchemy.orm import declarative_base, relationship
import sqlalchemy as sqla
logging.basicConfig(level=logging.INFO, format="%(asctime)s %(levelname)-4s %(name)s:%(lineno)d: %(message)s")
log = logging.getLogger(__name__)
Base = declarative_base()
class DHTPeer(Base):
__tablename__ = "peer"
peer_id = sqla.Column(sqla.Integer(), sqla.Identity(), primary_key=True)
node_id = sqla.Column(sqla.String(96))
address = sqla.Column(sqla.String())
udp_port = sqla.Column(sqla.Integer())
tcp_port = sqla.Column(sqla.Integer())
first_online = sqla.Column(sqla.DateTime())
errors = sqla.Column(sqla.Integer(), default=0)
last_churn = sqla.Column(sqla.Integer())
added_on = sqla.Column(sqla.DateTime(), nullable=False, default=datetime.datetime.utcnow)
last_check = sqla.Column(sqla.DateTime())
last_seen = sqla.Column(sqla.DateTime())
latency = sqla.Column(sqla.Integer())
endpoint_unique = sqla.UniqueConstraint("node_id", "udp_port")
@classmethod
def from_kad_peer(cls, peer):
return DHTPeer(node_id=peer.node_id, address=peer.address, udp_port=peer.udp_port, tcp_port=peer.tcp_port)
def to_kad_peer(self):
return make_kademlia_peer(self.node_id, self.address, self.udp_port, self.tcp_port)
class DHTConnection(Base):
__tablename__ = "connection"
from_peer_id = sqla.Column(sqla.Integer(), sqla.ForeignKey("peer.peer_id"), primary_key=True)
connected_by = relationship("DHTPeer", backref="known_by", primaryjoin=(DHTPeer.peer_id == from_peer_id))
to_peer_id = sqla.Column(sqla.Integer(), sqla.ForeignKey("peer.peer_id"), primary_key=True)
connected_to = relationship("DHTPeer", backref="connections", primaryjoin=(DHTPeer.peer_id == to_peer_id))
def new_node(address="0.0.0.0", udp_port=4444, node_id=None):
@ -24,13 +62,85 @@ def new_node(address="0.0.0.0", udp_port=4444, node_id=None):
class Crawler:
def __init__(self):
def __init__(self, db_path: str):
self.node = new_node()
self.crawled = set()
self.known_peers = set()
self.unreachable = set()
self.error = set()
self.semaphore = asyncio.Semaphore(10)
self.semaphore = asyncio.Semaphore(20)
engine = sqla.create_engine(f"sqlite:///{db_path}")
Base.metadata.create_all(engine)
session = sqla.orm.sessionmaker(engine)
self.db = session()
@property
def recent_peers_query(self):
half_hour_ago = datetime.datetime.utcnow() - datetime.timedelta(minutes=30)
return self.db.query(DHTPeer).filter(DHTPeer.last_seen > half_hour_ago)
@property
def all_peers(self):
return set([peer.to_kad_peer() for peer in self.recent_peers_query.all()])
@property
def unreachable_peers_count(self):
return self.recent_peers_query.filter(DHTPeer.latency == None).count()
@property
def peers_with_errors_count(self):
return self.recent_peers_query.filter(DHTPeer.errors > 0).count()
def get_peers_needing_check(self):
half_hour_ago = datetime.datetime.utcnow() - datetime.timedelta(minutes=30)
return set([peer.to_kad_peer() for peer in self.recent_peers_query.filter(
sqla.or_(DHTPeer.last_check == None, DHTPeer.last_check < half_hour_ago)).all()])
def add_peers(self, *peers):
for peer in peers:
db_peer = self.get_from_peer(peer)
if db_peer and db_peer.node_id is None and peer.node_id:
db_peer.node_id = peer.node_id
self.db.add(db_peer)
elif not db_peer:
self.db.add(DHTPeer.from_kad_peer(peer))
self.db.commit()
def get_from_peer(self, peer):
return self.db.query(DHTPeer).filter(DHTPeer.address==peer.address, DHTPeer.udp_port==peer.udp_port).first()
def set_latency(self, peer, latency=None):
db_peer = self.get_from_peer(peer)
db_peer.latency = latency
if not db_peer.node_id:
db_peer.node_id = peer.node_id
if db_peer.first_online and latency is None:
db_peer.last_churn = (datetime.datetime.utcnow() - db_peer.first_online).seconds
elif latency is not None and db_peer.first_online is None:
db_peer.first_online = datetime.datetime.utcnow()
db_peer.last_check = datetime.datetime.utcnow()
self.db.add(db_peer)
self.db.commit()
def inc_errors(self, peer):
db_peer = self.get_from_peer(peer)
db_peer.errors += 1
self.db.add(db_peer)
self.db.commit()
def count_peers(self):
return self.db.query(DHTPeer).count()
def associate_peers(self, target_peer, peers):
db_peer = self.get_from_peer(target_peer)
connections = [
DHTConnection(
from_peer_id=db_peer.peer_id,
to_peer_id=self.get_from_peer(peer).peer_id)
for peer in peers
]
for peer in peers:
self.db.query(DHTPeer).filter(DHTPeer.address == peer.address, DHTPeer.udp_port == peer.udp_port).update(
{DHTPeer.last_seen: datetime.datetime.utcnow()})
self.db.query(DHTConnection).filter(DHTConnection.from_peer_id == db_peer.peer_id).delete()
self.db.add_all(connections)
self.db.commit()
async def request_peers(self, host, port, key) -> typing.List['KademliaPeer']:
async with self.semaphore:
@ -45,29 +155,31 @@ class Crawler:
except lbry.dht.error.RemoteException as e:
log.info('Previously responding peer errored: %s:%d attempt #%d - %s',
host, port, (attempt + 1), str(e))
self.error.add((host, port))
self.inc_errors(peer)
continue
return []
async def crawl_routing_table(self, host, port):
start = time.time()
log.info("querying %s:%d", host, port)
self.known_peers.add((host, port))
self.crawled.add((host, port))
address = await resolve_host(host, port, 'udp')
self.add_peers(make_kademlia_peer(None, address, port))
key = self.node.protocol.peer_manager.get_node_id_for_endpoint(address, port)
if not key:
latency = None
for _ in range(3):
try:
async with self.semaphore:
ping_start = time.perf_counter_ns()
await self.node.protocol.get_rpc_peer(make_kademlia_peer(None, address, port)).ping()
key = self.node.protocol.peer_manager.get_node_id_for_endpoint(address, port)
latency = time.perf_counter_ns() - ping_start
except asyncio.TimeoutError:
pass
except lbry.dht.error.RemoteException:
self.error.add((host, port))
if not key:
self.unreachable.add((host, port))
self.inc_errors(make_kademlia_peer(None, address, port))
pass
self.set_latency(make_kademlia_peer(key, address, port), latency)
if not latency:
return set()
node_id = key
distance = Distance(key)
@ -98,7 +210,8 @@ class Crawler:
factor = 2048
log.info("Done querying %s:%d in %.2f seconds: %d peers found over %d requests.",
host, port, (time.time() - start), len(peers), i)
self.crawled.update(peers)
self.add_peers(*peers)
self.associate_peers(make_kademlia_peer(key, address, port), peers)
return peers
async def process(self):
@ -109,21 +222,31 @@ class Crawler:
to_process[_peer] = f
f.add_done_callback(lambda _: to_process.pop(_peer))
while to_process or len(self.known_peers) < len(self.crawled):
log.info("%d known, %d unreachable, %d error.. %d processing",
len(self.known_peers), len(self.unreachable), len(self.error), len(to_process))
for peer in self.crawled.difference(self.known_peers):
self.known_peers.add(peer)
to_check = self.get_peers_needing_check()
while True:
for peer in to_check:
if peer not in to_process:
submit(peer)
if len(to_process) > 20:
break
await asyncio.sleep(0)
log.info("%d known, %d unreachable, %d error, %d processing, %d on queue",
self.recent_peers_query.count(), self.unreachable_peers_count, self.peers_with_errors_count,
len(to_process), len(to_check))
await asyncio.wait(to_process.values(), return_when=asyncio.FIRST_COMPLETED)
to_check = self.get_peers_needing_check()
while not to_check and not to_process:
log.info("Idle, sleeping a minute.")
await asyncio.sleep(60.0)
to_check = self.get_peers_needing_check()
async def test():
crawler = Crawler()
crawler = Crawler("/tmp/a.db")
await crawler.node.start_listening()
conf = Config()
for (host, port) in conf.known_dht_nodes:
await crawler.crawl_routing_table(host, port)
#for (host, port) in conf.known_dht_nodes:
# await crawler.crawl_routing_table(host, port)
await crawler.process()
if __name__ == '__main__':