89 lines
2.4 KiB
Python
89 lines
2.4 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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if TYPE_CHECKING:
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from socket import socket
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from typing import TYPE_CHECKING, List
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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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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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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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except Exception:
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logger.warn(traceback.format_exc())
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sock.close()
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need_socket_lock.release()
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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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