//*****************************************************************************
// 服务配置
//*****************************************************************************
// 主备固定网关
var gateway = "192.168.60.1";
// 主服务器固定IP
var masterIp = "192.168.60.55";
// 备服务器固定IP
var slaveIp = "192.168.60.244";

// 虚拟IP对应的网络适配器名称
var adapterName = "以太网";
// 虚拟IP
var virtualIp = "192.168.0.11";
// 虚拟IP子网掩码
var netmask = "255.255.255.0";

// 是否启用日志
var logEnable = true;
// 日志文件夹
var logDir = ".\\log";

//*****************************************************************************
//*****************************************************************************


(function() {
	var ws = new ActiveXObject("wscript.shell");
	var fs = new ActiveXObject("Scripting.FileSystemObject");
	var tempDir = fs.GetSpecialFolder(2).Path;
	if (logDir.length == 0) {
		logDir = tempDir;
	} else {
		fs.CreateFolder(logDir);
	}
	
	function start() {
		/* 服务启动，调用脚本启动应用服务 */
	}
	
	function stop() {
		/* 停止服务，调用脚本停止应用服务 */
	}
	
	log("虚拟IP服务启动");
	while (true) {
		if (!ping(gateway)) {
			deleteVip();
		} else if (isMaster()) {
			log("当前是主服务器");
			addVip();
		} else {
			log("当前是备服务器");
			if (ping(masterIp)) {
				deleteVip();
			} else {
				addVip();
			}
		}
	}	
	
	/// 记录日志
	function log(str) {
		if (logEnable) {
			var time = new Date();
			var txt = time.toLocaleString() + " " + str;
			var file = logDir + "\\vip-" + time.getFullYear() + "-" + time.getMonth() + "-" + time.getDate() + ".log";
			ws.Run("cmd /c echo " + txt + " >> " + file, 0, true);
		}
	}
	
	/// 当前是否为主服务器
	function isMaster() {
		var ret = ws.Run("cmd /c ipconfig | findstr " + masterIp, 0, true);
		return ret == 0;
	}
	
	/// 网络测试
	function ping(ip) {
		var ret = ws.Run("cmd /c ping " + ip + " -n 5 -w 3 | findstr TTL", 0, true);
		if (ret != 0) {
			log("ping " + ip + "失败");
			return false;
		}
		return true;
	}
	
	/// 添加虚拟IP，启动应用服务
	function addVip() {
		var cmd = "cmd /c netsh interface ip add address";
		cmd += " " + adapterName;
		cmd += " " + virtualIp;
		cmd += " " + netmask;
		if (ws.Run(cmd, 0, true) == 0) {
			log("添加虚拟IP：" + virtualIp);
			start();
		}
	}
	
	/// 删除虚拟IP，停止应用服务
	function deleteVip() {
		var cmd = "cmd /c netsh interface ip delete address";
		cmd += " " + adapterName;
		cmd += " " + virtualIp;
		if (ws.Run(cmd, 0, true) == 0) {
			log("删除虚拟IP：" + virtualIp);
			stop();
		}
	}

}());