// 最简单的TCP端口检查脚本
const net = require('net');

const PORT = 3001;
const HOST = 'localhost';

console.log(`正在检查 ${HOST}:${PORT} 端口...`);

const client = new net.Socket();
let isOpen = false;

client.setTimeout(2000);

client.connect(PORT, HOST, () => {
  isOpen = true;
  console.log(`✅ 端口 ${PORT} 已开放！服务器正在运行。`);
  client.destroy();
});

client.on('error', (e) => {
  if (e.code === 'ECONNREFUSED') {
    console.log(`❌ 端口 ${PORT} 未开放或被拒绝连接。`);
  } else {
    console.error(`❌ 连接错误: ${e.message}`);
  }
  client.destroy();
});

client.on('timeout', () => {
  console.log(`❌ 端口 ${PORT} 连接超时。`);
  client.destroy();
});

client.on('close', () => {
  console.log('\n检查完成。');
});