benchmark: add undici websocket benchmark

Refs: nodejs/performance#114

benchmark/websocket/simple.js

@@ -0,0 +1,65 @@
+'use strict';
+
+const common = require('../common.js');
+const http = require('http');
+const WebSocketServer = require('ws');
+const { WebSocket } = require('undici');
+
+const port = 8181;
+const path = '';
+
+const configs = {
+  useBinary: ['true', 'false'],
+  roundtrips: [5000, 1000, 100, 1],
+  size: [64, 16 * 1024, 128 * 1024, 1024 * 1024],
+};
+
+const bench = common.createBenchmark(main, configs);
+
+function main(conf) {
+  const server = http.createServer();
+  const wss = new WebSocketServer.Server({
+    maxPayload: 600 * 1024 * 1024,
+    perMessageDeflate: false,
+    clientTracking: false,
+    server,
+  });
+
+  wss.on('connection', (ws) => {
+    ws.on('message', (data, isBinary) => {
+      ws.send(data, { binary: isBinary });
+    });
+  });
+
+  server.listen(path ? { path } : { port });
+  const url = path ? `ws+unix://${path}` : `ws://localhost:${port}`;
+  const wsc = new WebSocket(url);
+  const data = Buffer.allocUnsafe(conf.size).fill('.'); // Pre-fill data for testing
+
+  let roundtrip = 0;
+
+  wsc.addEventListener('error', (err) => {
+    throw err;
+  });
+
+  bench.start();
+
+  wsc.addEventListener('open', () => {
+    wsc.send(data, { binary: conf.useBinary });
+  });
+
+  wsc.addEventListener('close', () => {
+    wss.close(() => {
+      server.close();
+    });
+  });
+
+  wsc.addEventListener('message', () => {
+    if (++roundtrip !== conf.roundtrips) {
+      wsc.send(data, { binary: conf.useBinary });
+    } else {
+      bench.end(conf.roundtrips);
+      wsc.close();
+    }
+  });
+}