forked from LBRYCommunity/lbry-sdk
70 lines
2.6 KiB
Python
70 lines
2.6 KiB
Python
import asyncio
|
|
import typing
|
|
|
|
from lbry.dht import constants
|
|
if typing.TYPE_CHECKING:
|
|
from lbry.dht.peer import KademliaPeer, PeerManager
|
|
|
|
|
|
class DictDataStore:
|
|
def __init__(self, loop: asyncio.AbstractEventLoop, peer_manager: 'PeerManager'):
|
|
# Dictionary format:
|
|
# { <key>: [(<contact>, <age>), ...] }
|
|
self._data_store: typing.Dict[bytes, typing.List[typing.Tuple['KademliaPeer', float]]] = {}
|
|
|
|
self.loop = loop
|
|
self._peer_manager = peer_manager
|
|
self.completed_blobs: typing.Set[str] = set()
|
|
|
|
def removed_expired_peers(self):
|
|
now = self.loop.time()
|
|
keys = list(self._data_store.keys())
|
|
for key in keys:
|
|
to_remove = []
|
|
for (peer, ts) in self._data_store[key]:
|
|
if ts + constants.data_expiration < now or self._peer_manager.peer_is_good(peer) is False:
|
|
to_remove.append((peer, ts))
|
|
for item in to_remove:
|
|
self._data_store[key].remove(item)
|
|
if not self._data_store[key]:
|
|
del self._data_store[key]
|
|
|
|
def filter_bad_and_expired_peers(self, key: bytes) -> typing.Iterator['KademliaPeer']:
|
|
"""
|
|
Returns only non-expired and unknown/good peers
|
|
"""
|
|
for peer in self.filter_expired_peers(key):
|
|
if self._peer_manager.peer_is_good(peer) is not False:
|
|
yield peer
|
|
|
|
def filter_expired_peers(self, key: bytes) -> typing.Iterator['KademliaPeer']:
|
|
"""
|
|
Returns only non-expired peers
|
|
"""
|
|
now = self.loop.time()
|
|
for (peer, ts) in self._data_store.get(key, []):
|
|
if ts + constants.data_expiration > now:
|
|
yield peer
|
|
|
|
def has_peers_for_blob(self, key: bytes) -> bool:
|
|
return key in self._data_store
|
|
|
|
def add_peer_to_blob(self, contact: 'KademliaPeer', key: bytes) -> None:
|
|
now = self.loop.time()
|
|
if key in self._data_store:
|
|
current = list(filter(lambda x: x[0] == contact, self._data_store[key]))
|
|
if len(current):
|
|
self._data_store[key][self._data_store[key].index(current[0])] = contact, now
|
|
else:
|
|
self._data_store[key].append((contact, now))
|
|
else:
|
|
self._data_store[key] = [(contact, now)]
|
|
|
|
def get_peers_for_blob(self, key: bytes) -> typing.List['KademliaPeer']:
|
|
return list(self.filter_bad_and_expired_peers(key))
|
|
|
|
def get_storing_contacts(self) -> typing.List['KademliaPeer']:
|
|
peers = set()
|
|
for key, stored in self._data_store.items():
|
|
peers.update(set(map(lambda tup: tup[0], stored)))
|
|
return list(peers)
|