79 lines
2.7 KiB
Python
79 lines
2.7 KiB
Python
import asyncio
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from datetime import datetime
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from typing import Tuple
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from unittest import IsolatedAsyncioTestCase
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import numpy
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from cryptography.hazmat.primitives.asymmetric.x25519 import X25519PrivateKey
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from mixnet.bls import generate_bls
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from mixnet.client import mixclient_emitter
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from mixnet.mixnet import Mixnet, MixnetTopology
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from mixnet.node import MixNode, PacketQueue
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from mixnet.packet import PacketBuilder
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from mixnet.poisson import poisson_mean_interval_sec
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from mixnet.utils import random_bytes
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from mixnet.test_utils import with_test_timeout
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class TestMixClient(IsolatedAsyncioTestCase):
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@with_test_timeout(100)
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async def test_mixclient_emitter(self):
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mixnet, topology = self.init()
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real_packet_queue: PacketQueue = asyncio.Queue()
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outbound_socket: PacketQueue = asyncio.Queue()
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emission_rate_per_min = 30
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redundancy = 3
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_ = asyncio.create_task(
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mixclient_emitter(
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mixnet,
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topology,
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emission_rate_per_min,
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redundancy,
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real_packet_queue,
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outbound_socket,
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)
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)
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# Create packets. At least two packets are expected to be generated from a 3500-byte msg
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builder = PacketBuilder.real(random_bytes(3500), mixnet, topology)
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# Schedule two packets to the mix client without any interval
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packet, route = builder.next()
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await real_packet_queue.put((route[0].addr, packet))
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packet, route = builder.next()
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await real_packet_queue.put((route[0].addr, packet))
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# Calculate intervals between packet emissions from the mix client
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intervals = []
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ts = datetime.now()
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for _ in range(30):
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_ = await outbound_socket.get()
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now = datetime.now()
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intervals.append((now - ts).total_seconds())
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ts = now
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# Check if packets were emitted at the Poisson emission_rate
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# If emissions follow the Poisson distribution with a rate `lambda`,
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# a mean interval between emissions must be `1/lambda`.
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self.assertAlmostEqual(
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float(numpy.mean(intervals)),
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poisson_mean_interval_sec(emission_rate_per_min),
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delta=1.0,
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)
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@staticmethod
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def init() -> Tuple[Mixnet, MixnetTopology]:
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mixnet = Mixnet(
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[
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MixNode(
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generate_bls(),
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X25519PrivateKey.generate(),
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random_bytes(32),
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)
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for _ in range(12)
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]
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)
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topology = mixnet.build_topology(b"entropy", 3, 3)
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return mixnet, topology
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