66 lines
2.6 KiB
Python
66 lines
2.6 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 = {}
|
|
self._ongoing_searchs = {}
|
|
|
|
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
|
|
"""
|
|
self.peers.setdefault(blob_hash, {(self.dht_node.externalIP, self.dht_node.peerPort,)})
|
|
if not blob_hash in self._ongoing_searchs or self._ongoing_searchs[blob_hash].called:
|
|
self._ongoing_searchs[blob_hash] = self._execute_peer_search(blob_hash, timeout)
|
|
peers = set(self._filter_self(blob_hash) if filter_self else self.peers[blob_hash])
|
|
return defer.succeed([self.peer_manager.get_peer(*peer) for peer in peers])
|
|
|
|
@defer.inlineCallbacks
|
|
def _execute_peer_search(self, blob_hash, timeout):
|
|
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
|
|
self.peers[blob_hash].update(set((host, port) for _, host, port in peer_list))
|
|
except defer.TimeoutError:
|
|
log.debug("DHT timed out while looking peers for blob %s after %s seconds", blob_hash, timeout)
|
|
finally:
|
|
del self._ongoing_searchs[blob_hash]
|
|
|
|
def _filter_self(self, blob_hash):
|
|
my_host, my_port = self.dht_node.externalIP, self.dht_node.peerPort
|
|
return set((host, port) for host, port in self.peers[blob_hash] if (host, port) != (my_host, my_port))
|