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