forked from LBRYCommunity/lbry-sdk
64 lines
2.2 KiB
Python
64 lines
2.2 KiB
Python
import binascii
|
|
import logging
|
|
|
|
from twisted.internet import defer
|
|
from lbrynet import conf
|
|
|
|
|
|
log = logging.getLogger(__name__)
|
|
|
|
|
|
class DummyPeerFinder:
|
|
"""This class finds peers which have announced to the DHT that they have certain blobs"""
|
|
|
|
def find_peers_for_blob(self, blob_hash, timeout=None, filter_self=True):
|
|
return defer.succeed([])
|
|
|
|
|
|
class DHTPeerFinder(DummyPeerFinder):
|
|
"""This class finds peers which have announced to the DHT that they have certain blobs"""
|
|
#implements(IPeerFinder)
|
|
|
|
def __init__(self, dht_node, peer_manager):
|
|
"""
|
|
dht_node - an instance of dht.Node class
|
|
peer_manager - an instance of PeerManager class
|
|
"""
|
|
self.dht_node = dht_node
|
|
self.peer_manager = peer_manager
|
|
self.peers = {}
|
|
|
|
@defer.inlineCallbacks
|
|
def find_peers_for_blob(self, blob_hash, timeout=None, filter_self=True):
|
|
"""
|
|
Find peers for blob in the DHT
|
|
blob_hash (str): blob hash to look for
|
|
timeout (int): seconds to timeout after
|
|
filter_self (bool): if True, and if a peer for a blob is itself, filter it
|
|
from the result
|
|
|
|
Returns:
|
|
list of peers for the blob
|
|
"""
|
|
if blob_hash not in self.peers:
|
|
self.peers[blob_hash] = [(self.dht_node.externalIP, self.dht_node.peerPort)]
|
|
bin_hash = binascii.unhexlify(blob_hash)
|
|
finished_deferred = self.dht_node.iterativeFindValue(bin_hash, exclude=self.peers[blob_hash])
|
|
timeout = timeout or conf.settings['peer_search_timeout']
|
|
if timeout:
|
|
finished_deferred.addTimeout(timeout, self.dht_node.clock)
|
|
try:
|
|
peer_list = yield finished_deferred
|
|
except defer.TimeoutError:
|
|
log.debug("DHT timed out while looking peers for blob %s after %s seconds",
|
|
blob_hash, timeout)
|
|
peer_list = []
|
|
|
|
peers = set(peer_list)
|
|
results = []
|
|
for node_id, host, port in peers:
|
|
if filter_self and (host, port) == (self.dht_node.externalIP, self.dht_node.peerPort):
|
|
continue
|
|
results.append(self.peer_manager.get_peer(host, port))
|
|
self.peers[blob_hash].append((host, port))
|
|
defer.returnValue(results)
|