mirror of
https://github.com/logos-co/nomos-specs.git
synced 2025-02-18 18:26:43 +00:00
115 lines
3.9 KiB
Python
115 lines
3.9 KiB
Python
import queue
|
|
import threading
|
|
import time
|
|
from datetime import datetime
|
|
from typing import Tuple
|
|
from unittest import TestCase
|
|
|
|
import numpy
|
|
import timeout_decorator
|
|
from cryptography.hazmat.primitives.asymmetric.x25519 import X25519PrivateKey
|
|
from pysphinx.sphinx import SphinxPacket
|
|
|
|
from mixnet.bls import generate_bls
|
|
from mixnet.mixnet import Mixnet, MixnetTopology
|
|
from mixnet.node import MixNode, NodeAddress, PacketPayloadQueue, PacketQueue
|
|
from mixnet.packet import PacketBuilder
|
|
from mixnet.poisson import poisson_interval_sec, poisson_mean_interval_sec
|
|
from mixnet.utils import random_bytes
|
|
|
|
|
|
class TestMixNodeRunner(TestCase):
|
|
@timeout_decorator.timeout(180)
|
|
def test_mixnode_runner_emission_rate(self):
|
|
"""
|
|
Test if MixNodeRunner works as a M/M/inf queue.
|
|
|
|
If inputs are arrived at Poisson rate `lambda`,
|
|
and if processing is delayed according to an exponential distribution with a rate `mu`,
|
|
the rate of outputs should be `lambda`.
|
|
"""
|
|
mixnet, topology = self.init()
|
|
inbound_socket: PacketQueue = queue.Queue()
|
|
outbound_socket: PacketPayloadQueue = queue.Queue()
|
|
|
|
packet, route = PacketBuilder.real(b"msg", mixnet, topology).next()
|
|
|
|
delay_rate_per_min = 30 # mu (= 2s delay on average)
|
|
# Start only the first mix node for testing
|
|
runner = route[0].start(delay_rate_per_min, inbound_socket, outbound_socket)
|
|
|
|
# Send packets to the first mix node in a Poisson distribution
|
|
packet_count = 100
|
|
emission_rate_per_min = 120 # lambda (= 2msg/sec)
|
|
sender = threading.Thread(
|
|
target=self.send_packets,
|
|
args=(
|
|
inbound_socket,
|
|
packet,
|
|
route[0].addr,
|
|
packet_count,
|
|
emission_rate_per_min,
|
|
),
|
|
)
|
|
sender.daemon = True
|
|
sender.start()
|
|
|
|
# Calculate intervals between outputs and gather num_jobs in the first mix node.
|
|
intervals = []
|
|
num_jobs = []
|
|
ts = datetime.now()
|
|
for _ in range(packet_count):
|
|
_ = outbound_socket.get()
|
|
now = datetime.now()
|
|
intervals.append((now - ts).total_seconds())
|
|
num_jobs.append(runner.num_jobs())
|
|
ts = now
|
|
# Remove the first interval that would be much larger than other intervals,
|
|
# because of the delay in mix node.
|
|
intervals = intervals[1:]
|
|
num_jobs = num_jobs[1:]
|
|
|
|
# Check if the emission rate of the first mix node is the same as
|
|
# the emission rate of the message sender, but with a delay.
|
|
# If outputs follow the Poisson distribution with a rate `lambda`,
|
|
# a mean interval between outputs must be `1/lambda`.
|
|
self.assertAlmostEqual(
|
|
float(numpy.mean(intervals)),
|
|
poisson_mean_interval_sec(emission_rate_per_min),
|
|
delta=1.0,
|
|
)
|
|
# If runner is a M/M/inf queue,
|
|
# a mean number of jobs being processed/scheduled in the runner must be `lambda/mu`.
|
|
self.assertAlmostEqual(
|
|
float(numpy.mean(num_jobs)),
|
|
round(emission_rate_per_min / delay_rate_per_min),
|
|
delta=1.5,
|
|
)
|
|
|
|
@staticmethod
|
|
def send_packets(
|
|
inbound_socket: PacketQueue,
|
|
packet: SphinxPacket,
|
|
node_addr: NodeAddress,
|
|
cnt: int,
|
|
rate_per_min: int,
|
|
):
|
|
for _ in range(cnt):
|
|
time.sleep(poisson_interval_sec(rate_per_min))
|
|
inbound_socket.put((node_addr, packet))
|
|
|
|
@staticmethod
|
|
def init() -> Tuple[Mixnet, MixnetTopology]:
|
|
mixnet = Mixnet(
|
|
[
|
|
MixNode(
|
|
generate_bls(),
|
|
X25519PrivateKey.generate(),
|
|
random_bytes(32),
|
|
)
|
|
for _ in range(12)
|
|
]
|
|
)
|
|
topology = mixnet.build_topology(b"entropy", 3, 3)
|
|
return mixnet, topology
|