onionr/scripts/graph-simulation.py

93 lines
2.5 KiB
Python

from typing import NamedTuple, List
from hashlib import sha3_256
from secrets import randbelow
from random import SystemRandom
WeightedEdge = NamedTuple("WeightedEdge", "node", "weight")
message_pool: Set["Message"] = set() # This is just to save memory for the simulation
def get_message(hash_id):
for m in message_pool:
if hash_id == m.hash_id:
return m
raise ValueError
class Node:
def __init__(self, hidden_node: bool,
edges: List[WeightedEdge], graph_ids=["main"]):
self.hidden_node = hidden_node
self.edges = edges
self._messages: List[str] = list() # hashes point to message_pool
self._hidden_messages = List[str] = list()
def sharing_messages(self):
share = list(self._messages)
for m in self._hidden_messages:
share.remove(m)
return share
def add_message(self, hash_id):
if hash_id not in self._messages:
self._messages.append(message.hash_id)
def pick_edge(self):
selected = self.edges[0]
alt = []
for weighted_edge in self.edges[1:]:
if weighted_edge.weight > selected.weight:
selected = weighted_edge
elif weighted_edge.weight == selected.weight:
alt.append(selected)
alt.append(selected)
SystemRandom().shuffle(alt)
return alt[0]
def share_to_edges(self, message_id):
edge = self.pick_edge()
edge.node.add_message(message_id)
edge.weight += 1
def lookup_messages(self):
edge = self.pick_edge()
for message in edge.node.sharing_messages:
if message.hash_id not in self._messages:
self._messages.append(message.hash_id)
edge.weight += 1
def make_new_connections(self):
edge = self.pick_edge()
for new_edge in edge.edges:
if new_edge not in self.edges:
self.edges.append(WeightedEdge(new_edge.node, 0))
edge.weight += 1
class Message:
def __init__(self, data):
def _do_hash(data):
h = sha3_256()
h.update(data)
return h.digest()
self.hash_id = _do_hash(data)
self.data = data
bootstrap_node = Node(False, [])
graph = [bootstrap_node]
for i in range(10):
graph.append(Node(False, [bootstrap_node]))
m = Message("hello world")
message_pool.add(m)
bootstrap_node.add_message(m)
while True:
for node in graph:
node.make_new_connections()
node.lookup_messages()
bootstrap_node.add_message(m)