photovoltaic-pc/preload.js

/*
 * @Author: 李皓 hao_li_work@163.com
 * @Date: 2026-07-28 16:31:45
 * @LastEditors: 李皓 hao_li_work@163.com
 * @LastEditTime: 2026-07-28 16:44:07
 * @FilePath: \pc\preload.js
 * @Description: 
 * @Version: 1.0.0
 */
const { contextBridge } = require('electron')
const nodeNet = require('net')
const dns = require('dns')

/**
 * 尝试通过 TCP 连接指定端口检测主机是否可达
 */
function tryConnect(host, port, timeout) {
  return new Promise((resolve) => {
    const socket = new nodeNet.Socket()
    socket.setTimeout(timeout)
    socket.on('connect', () => { socket.destroy(); resolve(true) })
    socket.on('error', () => { socket.destroy(); resolve(false) })
    socket.on('timeout', () => { socket.destroy(); resolve(false) })
    socket.connect(port, host)
  })
}

/**
 * 网络检测对象
 */
const networkUtil = {
  /**
   * 检测目标主机网络连通性
   * @param {string} host - 目标主机地址
   * @param {number} timeout - 超时时间（毫秒）
   * @returns {Promise<boolean>} - 是否可达
   */
  async ping(host, timeout) {
    // 1. 先检查 DNS 能否解析
    try {
      await dns.promises.resolve(host)
    } catch {
      return false
    }

    // 2. 依次尝试常见端口（443 优先，80 兜底）
    const ports = [443, 80]
    for (const port of ports) {
      const ok = await tryConnect(host, port, timeout)
      if (ok) return true
    }

    return false
  }
}

/**
 * 应用传感器对象
 */
const appSensor = {
  version: '1.0.0',
  name: 'appSensor'
}

// 安全暴露 API 给渲染进程（挂载到 window.net，页面中可用 net.ping() 调用）
contextBridge.exposeInMainWorld('net', networkUtil)
contextBridge.exposeInMainWorld('appSensor', appSensor)