138 lines
4.5 KiB
Python
138 lines
4.5 KiB
Python
from queue import Empty, Queue
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from time import sleep
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from secrets import choice
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import traceback
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from typing import TYPE_CHECKING, Coroutine, Tuple, List
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from ordered_set import OrderedSet
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from onionrthreads import add_delayed_thread
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from blockdb import add_block_to_db
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import logger
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from ...constants import BLACKHOLE_EVADE_TIMER_SECS, OUTBOUND_DANDELION_EDGES
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from ...commands import GossipCommands, command_to_byte
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from ... import dandelion
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from ...blockqueues import gossip_block_queues
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from ...peerset import gossip_peer_set
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from .stemstream import do_stem_stream
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if TYPE_CHECKING:
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from onionrblocks import Block
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from ...peer import Peer
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from ...dandelion.phase import DandelionPhase
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import socket
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class NotEnoughEdges(ValueError): pass # noqa
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class StemConnectionDenied(ConnectionRefusedError): pass # noqa
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async def _setup_edge(
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peer_set: "OrderedSet[Peer]", exclude_set: "OrderedSet[Peer]"):
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"""Negotiate stem connection with random peer, add to exclu set if fail"""
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try:
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peer: 'Peer' = choice(peer_set - exclude_set)
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except IndexError:
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raise NotEnoughEdges
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# If peer is good or bad, exclude it no matter what
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exclude_set.add(peer)
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try:
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s = peer.get_socket(12)
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except TimeoutError:
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logger.debug(f"{peer.transport_address} timed out when trying stemout")
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except Exception:
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logger.debug(traceback.format_exc())
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return
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try:
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s.sendall(command_to_byte(GossipCommands.PUT_BLOCKS))
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s.settimeout(10)
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if s.recv(1) == dandelion.StemAcceptResult.DENY:
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raise StemConnectionDenied
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except TimeoutError:
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logger.debug("Peer timed out when establishing stem connection", terminal=True)
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logger.debug(traceback.format_exc())
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except StemConnectionDenied:
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logger.debug(
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"Stem connection denied (peer has too many) " +
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f"{peer.transport_address}")
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logger.debug(traceback.format_exc())
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except Exception:
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logger.warn(
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"Error asking peer to establish stem connection" +
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traceback.format_exc(), terminal=True)
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else:
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# Return peer socket if it is in stem reception mode successfully
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return s
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# If they won't accept stem blocks, close the socket
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s.close()
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async def stem_out(d_phase: 'DandelionPhase'):
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# don't bother if there are no possible outbound edges
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if not len(gossip_peer_set):
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sleep(1)
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return
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not_enough_edges = False
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# Spawn threads with deep copied block queue to add to db after time
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# for black hole attack
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for block_q in gossip_block_queues:
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add_delayed_thread(
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lambda q: set(map(add_block_to_db, q)),
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BLACKHOLE_EVADE_TIMER_SECS, list(block_q.queue))
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peer_sockets: List['socket.socket'] = []
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stream_routines: List[Coroutine] = []
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# Pick edges randomly
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# Using orderedset for the tried edges to ensure random pairing with queue
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tried_edges: "OrderedSet[Peer]" = OrderedSet()
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while len(peer_sockets) < OUTBOUND_DANDELION_EDGES or not_enough_edges:
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try:
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# Get a socket for stem out (makes sure they accept)
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peer_sockets.append(await _setup_edge(gossip_peer_set, tried_edges))
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except NotEnoughEdges:
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# No possible edges at this point (edges < OUTBOUND_DANDELION_EDGE)
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logger.warn("Making too few edges for stemout " +
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"this is bad for anonymity if frequent.",
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terminal=True)
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not_enough_edges = True
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else:
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# Ran out of time for stem phase
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if not d_phase.is_stem_phase() or d_phase.remaining_time() < 5:
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logger.error(
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"Did not stem out any blocks in time, " +
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"if this happens regularly you may be under attack",
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terminal=True)
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for s in peer_sockets:
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if s:
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s.close()
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peer_sockets.clear()
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break
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# If above loop ran out of time or NotEnoughEdges, loops below will not execute
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for count, peer_socket in enumerate(peer_sockets):
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stream_routines.append(
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do_stem_stream(peer_socket, gossip_block_queues[count], d_phase))
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for routine in stream_routines:
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try:
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await routine
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except Empty:
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pass
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except Exception:
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logger.warn(traceback.format_exc())
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else:
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# stream routine exited early
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pass
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