127 lines
3.9 KiB
Python
127 lines
3.9 KiB
Python
"""Onionr - Private P2P Communication.
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Download blocks that are being diffused
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doesn't apply for blocks in the gossip queue that are awaiting
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descision to fluff or stem
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"""
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from threading import Thread, Semaphore
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from random import SystemRandom
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from time import sleep
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import traceback
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from typing import TYPE_CHECKING, List
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import blockdb
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from ..constants import BLOCK_ID_SIZE, BLOCK_MAX_SIZE, BLOCK_MAX_SIZE_LEN, BLOCK_STREAM_OFFSET_DIGITS
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if TYPE_CHECKING:
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from socket import socket
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from gossip.peer import Peer
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from ordered_set import OrderedSet
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import logger
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import onionrblocks
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from ..peerset import gossip_peer_set
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from ..commands import GossipCommands, command_to_byte
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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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MAX_STREAMS = 3
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CONNECT_TIMEOUT = 12
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MAX_TRIED_PEERS = 10_000
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def stream_from_peers():
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# Pick N peers to stream from
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# Create sockets for them
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# Spawn thread to stream from the socket
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tried_peers: OrderedSet[Peer] = OrderedSet()
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sys_rand = SystemRandom()
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need_socket_lock = Semaphore(MAX_STREAMS)
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offset = 0
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def _stream_from_peer(peer: Peer):
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try:
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sock = peer.get_socket(CONNECT_TIMEOUT)
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sock.sendall(
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command_to_byte(GossipCommands.STREAM_BLOCKS)
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)
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sock.sendall(
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str(offset).zfill(BLOCK_STREAM_OFFSET_DIGITS).encode('utf-8'))
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while True:
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block_id = sock.recv(BLOCK_ID_SIZE)
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if blockdb.has_block(block_id):
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sock.sendall(int(0).to_bytes(1, 'big'))
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continue
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sock.sendall(int(1).to_bytes(1, 'big'))
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block_size = int(sock.recv(BLOCK_MAX_SIZE_LEN))
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if block_size > BLOCK_MAX_SIZE or block_size <= 0:
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logger.warn(
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f"Peer {peer.transport_address} " +
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"reported block size out of range")
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break
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block_data = sock.recv(block_size)
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try:
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blockdb.add_block_to_db(
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onionrblocks.Block(
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block_id, block_data, auto_verify=True)
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)
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except Exception:
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# They gave us a bad block, kill the stream
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# Could be corruption or malice
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sock.sendall(int(0).to_bytes(1, 'big'))
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raise
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# Tell them to keep streaming
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sock.sendall(int(1).to_bytes(1, 'big'))
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sock.close()
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except Exception:
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logger.warn(traceback.format_exc())
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finally:
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sock.close()
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need_socket_lock.release()
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# spawn stream threads infinitely
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while True:
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need_socket_lock.acquire()
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available_set = gossip_peer_set - tried_peers
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peers = sys_rand.sample(
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available_set,
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min(MAX_STREAMS, len(available_set)))
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tried_peers.update(peers)
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if len(tried_peers) >= MAX_TRIED_PEERS:
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tried_peers.pop()
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while len(peers):
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try:
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Thread(
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target=_stream_from_peer,
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args=[peers.pop()],
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daemon=True).start()
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except IndexError:
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need_socket_lock.release()
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break
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