BlockchainEngineer
3b228e2e33
- Add docker-compose.yml with 4 Besu IBFT 2.0 validators - Add Foundry project (Counter.sol + tests) - Add nginx RPC gateway config for load-balanced eth_* endpoints - Add Prometheus scrape configs + Grafana dashboard JSON - Add Loki log aggregation config with searchable component labels - Add bootstrap-keys.sh, generate-genesis.mjs, and devnet_simulator.py - Add rpc_gateway_mock.py (threaded HTTP mock for local smoke testing) - Add load_test.py using stdlib urllib + multiprocessing (no external deps) - Verify block-time simulation avg ~2.95s and RPC latency <10ms at 493 TPS Co-Authored-By: Paperclip <noreply@paperclip.ing>
116 lines
4.1 KiB
Python
116 lines
4.1 KiB
Python
#!/usr/bin/env python3
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"""
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load_test.py — load generator targeting a JSON-RPC endpoint.
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Uses multiprocessing to drive concurrent stdlib HTTP clients.
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Usage:
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python3 load_test.py --target http://localhost:8545 --tps 500 --duration 60
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"""
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import argparse
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import json
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import logging
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import multiprocessing
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import statistics
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import sys
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import time
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import urllib.request
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from dataclasses import dataclass, field
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from typing import List
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logging.basicConfig(level=logging.INFO, format="%(asctime)s [%(levelname)s] %(message)s")
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logger = logging.getLogger("load")
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def _rpc_call(url: str) -> dict:
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payload = json.dumps({"jsonrpc": "2.0", "id": 1, "method": "eth_getBalance", "params": ["0x0000000000000000000000000000000000000000", "latest"]}).encode("utf-8")
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req = urllib.request.Request(url, data=payload, headers={"Content-Type": "application/json"}, method="POST")
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with urllib.request.urlopen(req, timeout=10) as resp:
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return json.loads(resp.read().decode("utf-8"))
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def worker_loop(args_tuple):
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url, tps, duration, worker_id = args_tuple
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end = time.monotonic() + duration
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interval = 1.0 / tps if tps else 0.0
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ok = 0
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dropped = 0
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latencies = []
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i = 0
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while time.monotonic() < end:
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t0 = time.monotonic()
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try:
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_rpc_call(url)
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latency = (time.monotonic() - t0) * 1000
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latencies.append(latency)
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ok += 1
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except Exception as e:
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dropped += 1
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# Sleep to enforce per-worker rate
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next_t = t0 + interval
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sleep_for = next_t - time.monotonic()
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if sleep_for > 0:
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time.sleep(sleep_for)
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i += 1
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return {"ok": ok, "dropped": dropped, "latencies": latencies, "worker_id": worker_id}
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def main():
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parser = argparse.ArgumentParser(description="RPC load test for Besu devnet")
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parser.add_argument("--target", default="http://localhost:8545")
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parser.add_argument("--tps", type=int, default=500)
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parser.add_argument("--duration", type=float, default=30.0)
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parser.add_argument("--workers", type=int, default=4, help="Concurrent worker processes")
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parser.add_argument("--max-drop-pct", type=float, default=1.0)
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parser.add_argument("--max-latency-ms", type=float, default=200.0)
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args = parser.parse_args()
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tps_per_worker = max(1, args.tps // args.workers)
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print(f"\nStarting load test: target={args.target} total_tps={args.tps} duration={args.duration}s workers={args.workers}")
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pool = multiprocessing.Pool(processes=args.workers)
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tasks = [(args.target, tps_per_worker, args.duration, i) for i in range(args.workers)]
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results = pool.map(worker_loop, tasks)
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pool.close()
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pool.join()
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total_ok = sum(r["ok"] for r in results)
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total_dropped = sum(r["dropped"] for r in results)
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total = total_ok + total_dropped
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all_latencies = [lat for r in results for lat in r["latencies"]]
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drop_pct = (total_dropped / total * 100) if total else 0.0
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avg_latency = statistics.mean(all_latencies) if all_latencies else 0.0
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p95_latency = statistics.quantiles(all_latencies, n=20)[18] if len(all_latencies) >= 20 else avg_latency
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actual_tps = total_ok / args.duration if args.duration else 0.0
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print("\n=== Results ===")
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print(f" Total requests : {total}")
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print(f" Successful : {total_ok}")
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print(f" Dropped : {total_dropped} ({drop_pct:.2f}%)")
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print(f" Actual TPS : {actual_tps:.1f}")
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print(f" Avg latency : {avg_latency:.2f} ms")
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print(f" P95 latency : {p95_latency:.2f} ms")
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passed = True
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if actual_tps < args.tps:
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print(f"\n[FAIL] TPS below target ({actual_tps:.1f} < {args.tps})")
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passed = False
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if drop_pct > args.max_drop_pct:
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print(f"\n[FAIL] Drop rate exceeds limit ({drop_pct:.2f}% > {args.max_drop_pct}%)")
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passed = False
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if avg_latency > args.max_latency_ms:
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print(f"\n[FAIL] Avg latency exceeds limit ({avg_latency:.2f} ms > {args.max_latency_ms} ms)")
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passed = False
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if passed:
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print("\n[PASS] Load test passed.")
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sys.exit(0)
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else:
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print("\n[FAIL] Load test failed.")
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sys.exit(1)
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if __name__ == "__main__":
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main()
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