Onionr/src/communicator/onlinepeers/pickonlinepeers.py

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"""
Onionr - Private P2P Communication.
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pick online peers in a communicator instance
"""
import secrets
from typing import TYPE_CHECKING
import onionrexceptions
if TYPE_CHECKING:
from deadsimplekv import DeadSimpleKV
"""
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This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
"""
def pick_online_peer(kv: 'DeadSimpleKV'):
"""Randomly picks peer from pool without bias (using secrets module)."""
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ret_data = ''
peer_length = len(kv.get('onlinePeers'))
if peer_length <= 0:
raise onionrexceptions.OnlinePeerNeeded
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while True:
peer_length = len(kv.get('onlinePeers'))
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try:
# Get a random online peer, securely.
# May get stuck in loop if network is lost
ret_data = kv.get('onlinePeers')[secrets.randbelow(peer_length)]
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except IndexError:
pass
else:
break
return ret_data