forked from LBRYCommunity/lbry-sdk
658 lines
28 KiB
Python
658 lines
28 KiB
Python
import binascii
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import hashlib
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import logging
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from functools import reduce
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from twisted.internet import defer, error, task
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from lbrynet.core.utils import generate_id, DeferredDict
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from lbrynet.core.call_later_manager import CallLaterManager
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from lbrynet.core.PeerManager import PeerManager
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from .error import TimeoutError
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from . import constants
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from . import routingtable
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from . import datastore
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from . import protocol
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from .peerfinder import DHTPeerFinder
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from .contact import ContactManager
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from .iterativefind import iterativeFind
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log = logging.getLogger(__name__)
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def rpcmethod(func):
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""" Decorator to expose Node methods as remote procedure calls
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Apply this decorator to methods in the Node class (or a subclass) in order
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to make them remotely callable via the DHT's RPC mechanism.
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"""
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func.rpcmethod = True
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return func
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class MockKademliaHelper:
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def __init__(self, clock=None, callLater=None, resolve=None, listenUDP=None):
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if not listenUDP or not resolve or not callLater or not clock:
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from twisted.internet import reactor
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listenUDP = listenUDP or reactor.listenUDP
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resolve = resolve or reactor.resolve
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callLater = callLater or reactor.callLater
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clock = clock or reactor
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self.clock = clock
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self.contact_manager = ContactManager(self.clock.seconds)
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self.reactor_listenUDP = listenUDP
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self.reactor_resolve = resolve
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self.call_later_manager = CallLaterManager(callLater)
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self.reactor_callLater = self.call_later_manager.call_later
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self.reactor_callSoon = self.call_later_manager.call_soon
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self._listeningPort = None # object implementing Twisted
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# IListeningPort This will contain a deferred created when
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# joining the network, to enable publishing/retrieving
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# information from the DHT as soon as the node is part of the
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# network (add callbacks to this deferred if scheduling such
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# operations before the node has finished joining the network)
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def get_looping_call(self, fn, *args, **kwargs):
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lc = task.LoopingCall(fn, *args, **kwargs)
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lc.clock = self.clock
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return lc
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def safe_stop_looping_call(self, lc):
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if lc and lc.running:
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return lc.stop()
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return defer.succeed(None)
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def safe_start_looping_call(self, lc, t):
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if lc and not lc.running:
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lc.start(t)
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class Node(MockKademliaHelper):
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""" Local node in the Kademlia network
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This class represents a single local node in a Kademlia network; in other
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words, this class encapsulates an Entangled-using application's "presence"
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in a Kademlia network.
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In Entangled, all interactions with the Kademlia network by a client
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application is performed via this class (or a subclass).
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"""
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def __init__(self, node_id=None, udpPort=4000, dataStore=None,
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routingTableClass=None, networkProtocol=None,
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externalIP=None, peerPort=3333, listenUDP=None,
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callLater=None, resolve=None, clock=None, peer_finder=None,
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peer_manager=None, interface='', externalUDPPort=None):
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"""
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@param dataStore: The data store to use. This must be class inheriting
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from the C{DataStore} interface (or providing the
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same API). How the data store manages its data
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internally is up to the implementation of that data
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store.
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@type dataStore: entangled.kademlia.datastore.DataStore
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@param routingTable: The routing table class to use. Since there exists
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some ambiguity as to how the routing table should be
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implemented in Kademlia, a different routing table
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may be used, as long as the appropriate API is
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exposed. This should be a class, not an object,
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in order to allow the Node to pass an
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auto-generated node ID to the routingtable object
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upon instantiation (if necessary).
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@type routingTable: entangled.kademlia.routingtable.RoutingTable
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@param networkProtocol: The network protocol to use. This can be
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overridden from the default to (for example)
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change the format of the physical RPC messages
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being transmitted.
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@type networkProtocol: entangled.kademlia.protocol.KademliaProtocol
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@param externalIP: the IP at which this node can be contacted
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@param peerPort: the port at which this node announces it has a blob for
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"""
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super().__init__(clock, callLater, resolve, listenUDP)
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self.node_id = node_id or self._generateID()
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self.port = udpPort
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self._listen_interface = interface
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self._change_token_lc = self.get_looping_call(self.change_token)
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self._refresh_node_lc = self.get_looping_call(self._refreshNode)
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self._refresh_contacts_lc = self.get_looping_call(self._refreshContacts)
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# Create k-buckets (for storing contacts)
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if routingTableClass is None:
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self._routingTable = routingtable.TreeRoutingTable(self.node_id, self.clock.seconds)
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else:
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self._routingTable = routingTableClass(self.node_id, self.clock.seconds)
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# Initialize this node's network access mechanisms
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if networkProtocol is None:
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self._protocol = protocol.KademliaProtocol(self)
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else:
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self._protocol = networkProtocol
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# Initialize the data storage mechanism used by this node
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self.token_secret = self._generateID()
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self.old_token_secret = None
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self.externalIP = externalIP
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self.peerPort = peerPort
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self.externalUDPPort = externalUDPPort or self.port
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self._dataStore = dataStore or datastore.DictDataStore(self.clock.seconds)
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self.peer_manager = peer_manager or PeerManager()
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self.peer_finder = peer_finder or DHTPeerFinder(self, self.peer_manager)
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self._join_deferred = None
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#def __del__(self):
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# log.warning("unclean shutdown of the dht node")
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# if hasattr(self, "_listeningPort") and self._listeningPort is not None:
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# self._listeningPort.stopListening()
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def __str__(self):
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return '<%s.%s object; ID: %s, IP address: %s, UDP port: %d>' % (
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self.__module__, self.__class__.__name__, binascii.hexlify(self.node_id), self.externalIP, self.port)
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@defer.inlineCallbacks
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def stop(self):
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# stop LoopingCalls:
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yield self.safe_stop_looping_call(self._refresh_node_lc)
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yield self.safe_stop_looping_call(self._change_token_lc)
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yield self.safe_stop_looping_call(self._refresh_contacts_lc)
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if self._listeningPort is not None:
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yield self._listeningPort.stopListening()
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self._listeningPort = None
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def start_listening(self):
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if not self._listeningPort:
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try:
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self._listeningPort = self.reactor_listenUDP(self.port, self._protocol,
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interface=self._listen_interface)
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except error.CannotListenError as e:
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import traceback
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log.error("Couldn't bind to port %d. %s", self.port, traceback.format_exc())
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raise ValueError("%s lbrynet may already be running." % str(e))
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else:
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log.warning("Already bound to port %s", self._listeningPort)
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@defer.inlineCallbacks
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def joinNetwork(self, known_node_addresses=(('jack.lbry.tech', 4455), )):
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"""
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Attempt to join the dht, retry every 30 seconds if unsuccessful
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:param known_node_addresses: [(str, int)] list of hostnames and ports for known dht seed nodes
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"""
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self._join_deferred = defer.Deferred()
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known_node_resolution = {}
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@defer.inlineCallbacks
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def _resolve_seeds():
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result = {}
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for host, port in known_node_addresses:
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node_address = yield self.reactor_resolve(host)
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result[(host, port)] = node_address
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defer.returnValue(result)
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if not known_node_resolution:
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known_node_resolution = yield _resolve_seeds()
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# we are one of the seed nodes, don't add ourselves
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if (self.externalIP, self.port) in known_node_resolution.values():
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del known_node_resolution[(self.externalIP, self.port)]
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known_node_addresses.remove((self.externalIP, self.port))
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def _ping_contacts(contacts):
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d = DeferredDict({contact: contact.ping() for contact in contacts}, consumeErrors=True)
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d.addErrback(lambda err: err.trap(TimeoutError))
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return d
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@defer.inlineCallbacks
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def _initialize_routing():
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bootstrap_contacts = []
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contact_addresses = {(c.address, c.port): c for c in self.contacts}
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for (host, port), ip_address in known_node_resolution.items():
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if (host, port) not in contact_addresses:
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# Create temporary contact information for the list of addresses of known nodes
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# The contact node id will be set with the responding node id when we initialize it to None
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contact = self.contact_manager.make_contact(None, ip_address, port, self._protocol)
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bootstrap_contacts.append(contact)
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else:
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for contact in self.contacts:
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if contact.address == ip_address and contact.port == port:
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if not contact.id:
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bootstrap_contacts.append(contact)
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break
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if not bootstrap_contacts:
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log.warning("no bootstrap contacts to ping")
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ping_result = yield _ping_contacts(bootstrap_contacts)
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shortlist = list(ping_result.keys())
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if not shortlist:
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log.warning("failed to ping %i bootstrap contacts", len(bootstrap_contacts))
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defer.returnValue(None)
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else:
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# find the closest peers to us
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closest = yield self._iterativeFind(self.node_id, shortlist if not self.contacts else None)
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yield _ping_contacts(closest)
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# # query random hashes in our bucket key ranges to fill or split them
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# random_ids_in_range = self._routingTable.getRefreshList()
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# while random_ids_in_range:
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# yield self.iterativeFindNode(random_ids_in_range.pop())
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defer.returnValue(None)
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@defer.inlineCallbacks
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def _iterative_join(joined_d=None, last_buckets_with_contacts=None):
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log.info("Attempting to join the DHT network, %i contacts known so far", len(self.contacts))
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joined_d = joined_d or defer.Deferred()
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yield _initialize_routing()
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buckets_with_contacts = self.bucketsWithContacts()
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if last_buckets_with_contacts and last_buckets_with_contacts == buckets_with_contacts:
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if not joined_d.called:
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joined_d.callback(True)
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elif buckets_with_contacts < 4:
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self.reactor_callLater(0, _iterative_join, joined_d, buckets_with_contacts)
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elif not joined_d.called:
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joined_d.callback(None)
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yield joined_d
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if not self._join_deferred.called:
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self._join_deferred.callback(True)
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defer.returnValue(None)
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yield _iterative_join()
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@defer.inlineCallbacks
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def start(self, known_node_addresses=None):
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""" Causes the Node to attempt to join the DHT network by contacting the
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known DHT nodes. This can be called multiple times if the previous attempt
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has failed or if the Node has lost all the contacts.
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@param known_node_addresses: A sequence of tuples containing IP address
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information for existing nodes on the
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Kademlia network, in the format:
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C{(<ip address>, (udp port>)}
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@type known_node_addresses: list
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"""
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self.start_listening()
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yield self._protocol._listening
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# TODO: Refresh all k-buckets further away than this node's closest neighbour
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yield self.joinNetwork(known_node_addresses or [])
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self.start_looping_calls()
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def start_looping_calls(self):
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self.safe_start_looping_call(self._change_token_lc, constants.tokenSecretChangeInterval)
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# Start refreshing k-buckets periodically, if necessary
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self.safe_start_looping_call(self._refresh_node_lc, constants.checkRefreshInterval)
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self.safe_start_looping_call(self._refresh_contacts_lc, 60)
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@property
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def contacts(self):
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def _inner():
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for i in range(len(self._routingTable._buckets)):
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for contact in self._routingTable._buckets[i]._contacts:
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yield contact
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return list(_inner())
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def hasContacts(self):
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for bucket in self._routingTable._buckets:
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if bucket._contacts:
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return True
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return False
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def bucketsWithContacts(self):
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return self._routingTable.bucketsWithContacts()
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@defer.inlineCallbacks
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def storeToContact(self, blob_hash, contact):
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try:
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if not contact.token:
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yield contact.findValue(blob_hash)
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res = yield contact.store(blob_hash, contact.token, self.peerPort, self.node_id, 0)
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if res != b"OK":
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raise ValueError(res)
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log.debug("Stored %s to %s (%s)", binascii.hexlify(blob_hash), contact.log_id(), contact.address)
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return True
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except protocol.TimeoutError:
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log.debug("Timeout while storing blob_hash %s at %s",
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binascii.hexlify(blob_hash), contact.log_id())
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except ValueError as err:
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log.error("Unexpected response: %s" % err)
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except Exception as err:
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if 'Invalid token' in str(err):
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contact.update_token(None)
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log.error("Unexpected error while storing blob_hash %s at %s: %s",
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binascii.hexlify(blob_hash), contact, err)
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return False
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@defer.inlineCallbacks
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def announceHaveBlob(self, blob_hash):
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contacts = yield self.iterativeFindNode(blob_hash)
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if not self.externalIP:
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raise Exception("Cannot determine external IP: %s" % self.externalIP)
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stored_to = yield DeferredDict({contact: self.storeToContact(blob_hash, contact) for contact in contacts})
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contacted_node_ids = [binascii.hexlify(contact.id) for contact in stored_to.keys() if stored_to[contact]]
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log.debug("Stored %s to %i of %i attempted peers", binascii.hexlify(blob_hash),
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len(contacted_node_ids), len(contacts))
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defer.returnValue(contacted_node_ids)
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def change_token(self):
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self.old_token_secret = self.token_secret
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self.token_secret = self._generateID()
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def make_token(self, compact_ip):
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h = hashlib.new('sha384')
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h.update(self.token_secret + compact_ip)
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return h.digest()
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def verify_token(self, token, compact_ip):
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h = hashlib.new('sha384')
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h.update(self.token_secret + compact_ip)
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if self.old_token_secret and not token == h.digest(): # TODO: why should we be accepting the previous token?
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h = hashlib.new('sha384')
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h.update(self.old_token_secret + compact_ip)
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if not token == h.digest():
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return False
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return True
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def iterativeFindNode(self, key):
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""" The basic Kademlia node lookup operation
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Call this to find a remote node in the P2P overlay network.
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@param key: the n-bit key (i.e. the node or value ID) to search for
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@type key: str
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@return: This immediately returns a deferred object, which will return
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a list of k "closest" contacts (C{kademlia.contact.Contact}
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objects) to the specified key as soon as the operation is
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finished.
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@rtype: twisted.internet.defer.Deferred
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"""
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return self._iterativeFind(key)
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@defer.inlineCallbacks
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def iterativeFindValue(self, key, exclude=None):
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""" The Kademlia search operation (deterministic)
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Call this to retrieve data from the DHT.
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@param key: the n-bit key (i.e. the value ID) to search for
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@type key: str
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@return: This immediately returns a deferred object, which will return
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either one of two things:
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- If the value was found, it will return a Python
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dictionary containing the searched-for key (the C{key}
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parameter passed to this method), and its associated
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value, in the format:
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C{<str>key: <str>data_value}
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- If the value was not found, it will return a list of k
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"closest" contacts (C{kademlia.contact.Contact} objects)
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to the specified key
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@rtype: twisted.internet.defer.Deferred
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"""
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if len(key) != constants.key_bits // 8:
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raise ValueError("invalid key length!")
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# Execute the search
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find_result = yield self._iterativeFind(key, rpc='findValue', exclude=exclude)
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if isinstance(find_result, dict):
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# We have found the value; now see who was the closest contact without it...
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# ...and store the key/value pair
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pass
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else:
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# The value wasn't found, but a list of contacts was returned
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# Now, see if we have the value (it might seem wasteful to search on the network
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# first, but it ensures that all values are properly propagated through the
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# network
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if self._dataStore.hasPeersForBlob(key):
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# Ok, we have the value locally, so use that
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# Send this value to the closest node without it
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peers = self._dataStore.getPeersForBlob(key)
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find_result = {key: peers}
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else:
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pass
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defer.returnValue(list(set(find_result.get(key, []) if find_result else [])))
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# TODO: get this working
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# if 'closestNodeNoValue' in find_result:
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# closest_node_without_value = find_result['closestNodeNoValue']
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# try:
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# response, address = yield closest_node_without_value.findValue(key, rawResponse=True)
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# yield closest_node_without_value.store(key, response.response['token'], self.peerPort)
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# except TimeoutError:
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# pass
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def addContact(self, contact):
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""" Add/update the given contact; simple wrapper for the same method
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in this object's RoutingTable object
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@param contact: The contact to add to this node's k-buckets
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@type contact: kademlia.contact.Contact
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"""
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return self._routingTable.addContact(contact)
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def removeContact(self, contact):
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""" Remove the contact with the specified node ID from this node's
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table of known nodes. This is a simple wrapper for the same method
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in this object's RoutingTable object
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@param contact: The Contact object to remove
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@type contact: _Contact
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"""
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self._routingTable.removeContact(contact)
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def findContact(self, contactID):
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""" Find a entangled.kademlia.contact.Contact object for the specified
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cotact ID
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@param contactID: The contact ID of the required Contact object
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@type contactID: str
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@return: Contact object of remote node with the specified node ID,
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or None if the contact was not found
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@rtype: twisted.internet.defer.Deferred
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"""
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try:
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df = defer.succeed(self._routingTable.getContact(contactID))
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except (ValueError, IndexError):
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df = self.iterativeFindNode(contactID)
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df.addCallback(lambda nodes: ([node for node in nodes if node.id == contactID] or (None,))[0])
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return df
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@rpcmethod
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def ping(self):
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""" Used to verify contact between two Kademlia nodes
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@rtype: str
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"""
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return b'pong'
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@rpcmethod
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def store(self, rpc_contact, blob_hash, token, port, originalPublisherID, age):
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|
""" Store the received data in this node's local datastore
|
|
|
|
@param blob_hash: The hash of the data
|
|
@type blob_hash: str
|
|
|
|
@param token: The token we previously returned when this contact sent us a findValue
|
|
@type token: str
|
|
|
|
@param port: The TCP port the contact is listening on for requests for this blob (the peerPort)
|
|
@type port: int
|
|
|
|
@param originalPublisherID: The node ID of the node that is the publisher of the data
|
|
@type originalPublisherID: str
|
|
|
|
@param age: The relative age of the data (time in seconds since it was
|
|
originally published). Note that the original publish time
|
|
isn't actually given, to compensate for clock skew between
|
|
different nodes.
|
|
@type age: int
|
|
|
|
@rtype: str
|
|
"""
|
|
|
|
if originalPublisherID is None:
|
|
originalPublisherID = rpc_contact.id
|
|
compact_ip = rpc_contact.compact_ip()
|
|
if self.clock.seconds() - self._protocol.started_listening_time < constants.tokenSecretChangeInterval:
|
|
pass
|
|
elif not self.verify_token(token, compact_ip):
|
|
raise ValueError("Invalid token")
|
|
if 0 <= port <= 65536:
|
|
compact_port = port.to_bytes(2, 'big')
|
|
else:
|
|
raise TypeError(f'Invalid port: {port}')
|
|
compact_address = compact_ip + compact_port + rpc_contact.id
|
|
now = int(self.clock.seconds())
|
|
originallyPublished = now - age
|
|
self._dataStore.addPeerToBlob(rpc_contact, blob_hash, compact_address, now, originallyPublished,
|
|
originalPublisherID)
|
|
return b'OK'
|
|
|
|
@rpcmethod
|
|
def findNode(self, rpc_contact, key):
|
|
""" Finds a number of known nodes closest to the node/value with the
|
|
specified key.
|
|
|
|
@param key: the n-bit key (i.e. the node or value ID) to search for
|
|
@type key: str
|
|
|
|
@return: A list of contact triples closest to the specified key.
|
|
This method will return C{k} (or C{count}, if specified)
|
|
contacts if at all possible; it will only return fewer if the
|
|
node is returning all of the contacts that it knows of.
|
|
@rtype: list
|
|
"""
|
|
if len(key) != constants.key_bits // 8:
|
|
raise ValueError("invalid contact id length: %i" % len(key))
|
|
|
|
contacts = self._routingTable.findCloseNodes(key, sender_node_id=rpc_contact.id)
|
|
contact_triples = []
|
|
for contact in contacts:
|
|
contact_triples.append((contact.id, contact.address, contact.port))
|
|
return contact_triples
|
|
|
|
@rpcmethod
|
|
def findValue(self, rpc_contact, key):
|
|
""" Return the value associated with the specified key if present in
|
|
this node's data, otherwise execute FIND_NODE for the key
|
|
|
|
@param key: The hashtable key of the data to return
|
|
@type key: str
|
|
|
|
@return: A dictionary containing the requested key/value pair,
|
|
or a list of contact triples closest to the requested key.
|
|
@rtype: dict or list
|
|
"""
|
|
|
|
if len(key) != constants.key_bits // 8:
|
|
raise ValueError("invalid blob hash length: %i" % len(key))
|
|
|
|
response = {
|
|
b'token': self.make_token(rpc_contact.compact_ip()),
|
|
}
|
|
|
|
if self._protocol._protocolVersion:
|
|
response[b'protocolVersion'] = self._protocol._protocolVersion
|
|
|
|
# get peers we have stored for this blob
|
|
has_other_peers = self._dataStore.hasPeersForBlob(key)
|
|
peers = []
|
|
if has_other_peers:
|
|
peers.extend(self._dataStore.getPeersForBlob(key))
|
|
|
|
# if we don't have k storing peers to return and we have this hash locally, include our contact information
|
|
if len(peers) < constants.k and key in self._dataStore.completed_blobs:
|
|
compact_ip = reduce(lambda buff, x: buff + bytearray([int(x)]), self.externalIP.split('.'), bytearray())
|
|
compact_port = self.peerPort.to_bytes(2, 'big')
|
|
compact_address = compact_ip + compact_port + self.node_id
|
|
peers.append(compact_address)
|
|
|
|
if peers:
|
|
response[key] = peers
|
|
else:
|
|
response[b'contacts'] = self.findNode(rpc_contact, key)
|
|
return response
|
|
|
|
def _generateID(self):
|
|
""" Generates an n-bit pseudo-random identifier
|
|
|
|
@return: A globally unique n-bit pseudo-random identifier
|
|
@rtype: str
|
|
"""
|
|
return generate_id()
|
|
|
|
# from lbrynet.core.utils import profile_deferred
|
|
# @profile_deferred()
|
|
@defer.inlineCallbacks
|
|
def _iterativeFind(self, key, startupShortlist=None, rpc='findNode', exclude=None):
|
|
""" The basic Kademlia iterative lookup operation (for nodes/values)
|
|
|
|
This builds a list of k "closest" contacts through iterative use of
|
|
the "FIND_NODE" RPC, or if C{findValue} is set to C{True}, using the
|
|
"FIND_VALUE" RPC, in which case the value (if found) may be returned
|
|
instead of a list of contacts
|
|
|
|
@param key: the n-bit key (i.e. the node or value ID) to search for
|
|
@type key: str
|
|
@param startupShortlist: A list of contacts to use as the starting
|
|
shortlist for this search; this is normally
|
|
only used when the node joins the network
|
|
@type startupShortlist: list
|
|
@param rpc: The name of the RPC to issue to remote nodes during the
|
|
Kademlia lookup operation (e.g. this sets whether this
|
|
algorithm should search for a data value (if
|
|
rpc='findValue') or not. It can thus be used to perform
|
|
other operations that piggy-back on the basic Kademlia
|
|
lookup operation (Entangled's "delete" RPC, for instance).
|
|
@type rpc: str
|
|
|
|
@return: If C{findValue} is C{True}, the algorithm will stop as soon
|
|
as a data value for C{key} is found, and return a dictionary
|
|
containing the key and the found value. Otherwise, it will
|
|
return a list of the k closest nodes to the specified key
|
|
@rtype: twisted.internet.defer.Deferred
|
|
"""
|
|
|
|
if len(key) != constants.key_bits // 8:
|
|
raise ValueError("invalid key length: %i" % len(key))
|
|
|
|
if startupShortlist is None:
|
|
shortlist = self._routingTable.findCloseNodes(key)
|
|
# if key != self.node_id:
|
|
# # Update the "last accessed" timestamp for the appropriate k-bucket
|
|
# self._routingTable.touchKBucket(key)
|
|
if len(shortlist) == 0:
|
|
log.warning("This node doesn't know any other nodes")
|
|
# This node doesn't know of any other nodes
|
|
fakeDf = defer.Deferred()
|
|
fakeDf.callback([])
|
|
result = yield fakeDf
|
|
defer.returnValue(result)
|
|
else:
|
|
# This is used during the bootstrap process
|
|
shortlist = startupShortlist
|
|
|
|
result = yield iterativeFind(self, shortlist, key, rpc, exclude=exclude)
|
|
defer.returnValue(result)
|
|
|
|
@defer.inlineCallbacks
|
|
def _refreshNode(self):
|
|
""" Periodically called to perform k-bucket refreshes and data
|
|
replication/republishing as necessary """
|
|
yield self._refreshRoutingTable()
|
|
self._dataStore.removeExpiredPeers()
|
|
self._refreshStoringPeers()
|
|
defer.returnValue(None)
|
|
|
|
def _refreshContacts(self):
|
|
self._protocol._ping_queue.enqueue_maybe_ping(*self.contacts, delay=0)
|
|
|
|
def _refreshStoringPeers(self):
|
|
self._protocol._ping_queue.enqueue_maybe_ping(*self._dataStore.getStoringContacts(), delay=0)
|
|
|
|
@defer.inlineCallbacks
|
|
def _refreshRoutingTable(self):
|
|
nodeIDs = self._routingTable.getRefreshList(0, False)
|
|
while nodeIDs:
|
|
searchID = nodeIDs.pop()
|
|
yield self.iterativeFindNode(searchID)
|
|
defer.returnValue(None)
|