使用fastify-session和fastify-webockets时，如何访问会话？

const fastify = require('fastify')({ logger: true });
const session = require('fastify-session');
const WebSocket = require('fastify-websockets');

// 设置会话插件
fastify.register(session, {
  secret: 'supersecret',
  cookie: { maxAge: 60000 } // 设置 cookie 的过期时间
});

// 设置 WebSocket 插件
fastify.register(WebSocket);

// 创建一个 WebSocket 路由
fastify.get('/ws', { websocket: true }, (connection, request) => {
  // 在 WebSocket 连接中访问会话数据
  const sessionId = request.session.id;
  console.log(`Session ID: ${sessionId}`);

  connection.on('message', (message) => {
    console.log(`Received message: ${message}`);
    // 使用会话数据进行响应或其他操作
    connection.send(`Echo: ${message}`);
  });

  connection.on('close', () => {
    console.log('WebSocket closed');
  });
});

// 启动服务器
const start = async () => {
  try {
    await fastify.listen(3000);
    fastify.log.info(`server listening on ${fastify.server.address().port}`);
  } catch (err) {
    fastify.log.error(err);
    process.exit(1);
  }
};

start();