120 lines
3.8 KiB
Python
120 lines
3.8 KiB
Python
"""Onionr - Private P2P Communication.
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Torgossip peer safedb interface
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"""
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from base64 import b32decode
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from struct import unpack, pack
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from time import time
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from typing import List
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import binascii
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from utils.identifyhome import identify_home
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import safedb
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"""
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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"""
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class TorGossipPeers: # name it this way to avoid collisions in SharedState
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PACK_FORMAT = "qQ"
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def __init__(self, encrypt=False):
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self.db = safedb.SafeDB(
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identify_home() + "/torgossip-peers.db", protected=encrypt)
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def _shrink_peer_address(self, peer):
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# strip .onion and b32decode peer address for lower database mem usage
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if len(peer) == 62: # constant time
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return b32decode(peer[:-6]) # O(N)
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else:
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try:
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return b32decode(peer.upper())
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except binascii.Error:
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pass
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return peer
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def _pack_and_store_info(self, peer, new_score=None, new_seen=None):
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# Repack peer information with new value(s) and store it
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peer = self._shrink_peer_address(peer)
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try:
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score, seen = unpack(self.PACK_FORMAT, self.db.get(peer))
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except KeyError:
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score = seen = 0
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if new_score:
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score = new_score
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if new_seen:
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seen = new_seen
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self.db.put(peer, pack(self.PACK_FORMAT, score, seen))
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def get_highest_score_peers(self, max) -> List:
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assert max >= 1
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peer = self.db.db_conn.firstkey()
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if peer == b'enc':
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peer = self.db.db_conn.nextkey(peer)
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if not peer:
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return []
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assert len(peer) == 35
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top = [(peer, self.db.get(peer))]
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while peer:
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peer = self.db.db_conn.nextkey(peer)
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if not peer:
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break
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if peer == b"enc":
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continue
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# score, seen is data
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peer_data = self.db.get(peer)
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overwrite = None
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if len(top) != max:
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top.append((peer, peer_data))
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peer = self.db.db_conn.nextkey(peer)
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continue
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for count, cur_top in enumerate(top):
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# if peer score is greater than any set peer, overwrite
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if unpack(self.PACK_FORMAT, cur_top[1])[0] < \
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unpack(self.PACK_FORMAT, peer_data)[0]:
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overwrite = count
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break # below else won't execute, so it will be overwritten
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else:
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# if not overwriting, go to next peer
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peer = self.db.db_conn.nextkey(peer)
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continue
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top[overwrite] = (peer, peer_data)
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return top
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def add_score(self, peer, plus):
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shrunk = self._shrink_peer_address(peer)
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score, _ = unpack("qQ", self.db.get(shrunk))
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self._pack_and_store_info(
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shrunk, new_score=score + plus)
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def update_seen(self, peer):
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peer = self._shrink_peer_address(peer)
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self._pack_and_store_info(peer, new_seen=int(time()))
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def add_peer(self, peer):
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self.update_seen(peer)
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def remove_peer(self, peer):
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peer = self._shrink_peer_address(peer)
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del self.db.db_conn[peer]
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