Function measureHandshakeBytes

test/parallel/test-tls-certificate-compression.js:164–200

(serverOpts, clientOpts)

  // raw bytes transferred. The proxy counts bytes to measure the on-the-wire
  // handshake size (which reflects certificate compression savings).
  async function measureHandshakeBytes(serverOpts, clientOpts) {
    const { promise: serverConnected, resolve: onServerConn } = Promise.withResolvers();
    const server = tls.createServer(serverOpts, common.mustCall((socket) => {
      onServerConn();
      socket.destroy();
    }));
    server.listen(0);
    await once(server, 'listening');

    let proxyClientConn;
    const proxy = net.createServer(common.mustCall((clientConn) => {
      proxyClientConn = clientConn;
      const serverConn = net.connect(server.address().port);
      clientConn.pipe(serverConn);
      serverConn.pipe(clientConn);
      serverConn.on('error', () => {});
      clientConn.on('error', () => {});
    }));
    proxy.listen(0);
    await once(proxy, 'listening');

    const client = tls.connect({
      port: proxy.address().port,
      rejectUnauthorized: false,
      minVersion: 'TLSv1.3',
      ...clientOpts,
    });
    await serverConnected;

    const totalBytes = proxyClientConn.bytesRead + proxyClientConn.bytesWritten;

    client.destroy();
    server.close();
    proxy.close();

    return totalBytes;
  }

  const baseline = await measureHandshakeBytes(
    { key, cert, minVersion: 'TLSv1.3' },