HTML5-WebSocket实现对服务器CPU实时监控

由于WebSocket允许保持长连接,因此当建立连接后服务器可以主动地向Client发送相关信息.下面通过服务端获取当前cpu的使用情况主动发送给网页,让网页实时显示CPU使用情况的曲线图.该事例的主要功能是包括服务端获取CPU使和情况和HTmL5使用canvas进行曲线图绘制.

应用效果

实现效果主要是模仿windows的任务管理器,显示每个核的工作情况.

C#获取CPU使用情况

可能通过performancecounter来获取具本CPU线程的使用情况,不过在构建PerformanceCounter前先获取到CPU对应的线程数量.获取这个数量可以通过Environment.ProcessorCount属性获取,然后遍历构建每个PerformanceCounter

int coreCount = Environment.ProcessorCount; for (int i = 0; i < coreCount; i++) { mCounters.Add(new PerformanceCounter("Processor", "% Processor Time", i.ToString())); }

为了方便计数器的处理,简单地封装了一个基础类,完整代码如下:

/// <summary> /// Copyright © henryfan 2012 ///Email: henryfan@msn.com ///HomePage: http://www.ikende.com ///CreateTime: 2012/12/24 15:10:44 /// </summary> public class ProcessorCounter { private List<PerformanceCounter> mCounters = new List<PerformanceCounter>(); public IList<PerformanceCounter> Counters { get { return mCounters; } } public void Open() { int coreCount = Environment.ProcessorCount; for (int i = 0; i < coreCount; i++) { mCounters.Add(new PerformanceCounter("Processor", "% Processor Time", i.ToString())); } } public ItemUsage[] GetValues() { ItemUsage[] values = new ItemUsage[mCounters.Count]; for (int i = 0; i < mCounters.Count; i++) { values[i] = new ItemUsage(); values[i].ID = i.ToString(); values[i].Name = "CPU " +i.ToString(); values[i].Percent = mCounters[i].NextValue(); } return values; } } public class ItemUsage { public string Name { get; set; } public float Percent { get; set; } public string ID { get; set; } }

这样一个用于统计CPU所有线程使用情况计数的类就完成了.

页面绘制处理

首先定义一些简单的处理结构

function ProcessorInfo() { this.Item = null; this.Points = new Array(); for (var i = 0; i < 50; i++) { this.Points.push(new Point(0, 0)); } } function Point(x, y) { this.X = x; this.Y = y; }

主要定义线程信息结构,默认初始化50个座标,当在接收服务线程使用情况的时候,构建一个点添加到数组件尾部同时把第一个移走.通过定时绘制这50个点的曲线这样一个动态的走势就可以完成了.

function drawProceessor(item) { var canvas = document.getElementById('processimg' + item.Item.ID); var context = canvas.getContext('2d'); context.beginPath(); context.rect(0, 0, 200, 110); context.fillStyle = 'black'; context.fill(); context.lineWidth = 2; context.strokeStyle = 'white'; context.stroke(); context.beginPath(); context.moveTo(2, 106); for (var i = 0; i < item.Points.length; i++) { context.lineTo(4 * i + 2, 110 - item.Points[i].Y - 4); } context.lineTo(200, 106); context.closePath(); context.lineWidth = 1; context.fillStyle = '#7FFF00'; context.fill(); context.strokeStyle = '#7CFC00'; context.stroke(); context.font = '12pt Calibri'; context.fillStyle = 'white'; context.fillText(item.Item.Name, 60, 20); } function addUploadItem(info) { if (cpus[info.ID] == null) { var pinfo = new ProcessorInfo(); pinfo.Item = info; $('<canvas id="processimg' + info.ID + '" width="200" height="110"></canvas>').appendTo($('#lstProcessors')); cpus[info.ID] = pinfo; processors.push(pinfo); pinfo.Points.shift(); pinfo.Points.push(new Point(0, info.Percent)); drawProceessor(pinfo); } else { var pinfo = cpus[info.ID]; pinfo.Points.shift(); pinfo.Points.push(new Point(0, info.Percent)); } }

只需要通过定时器来不停地更新线程使用绘制即可.

setInterval(function () { for (var i = 0; i < processors.length; i++) { drawProceessor(processors[i]); } }, 1000);

服务端

对于服务端其实可以根据自己的需要来使用websocket协议实现,.net 4.5也提供相应的封装.而这里则使用了beetle对应websocket的扩展协议包,整体代码如下:

class Program : WebSocketJsonServer { static void Main(string[] args) { TcpUtils.Setup("beetle"); Program server = new Program(); server.Open(8070); Console.WriteLine("websocket start@8070"); ProcessorCounter counters = new ProcessorCounter(); counters.Open(); while (true) { ItemUsage[] items = counters.GetValues(); foreach (ItemUsage item in items) { Console.WriteLine("{0}:{1}%", item.Name, item.Percent); } JsonMessage message = new JsonMessage(); message.type = "cpu useage"; message.data = items; foreach (TcpChannel channel in server.Server.GetOnlines()) { channel.Send(message); } system.Threading.Thread.Sleep(995); } System.Threading.Thread.Sleep(-1); } protected override void OnError(object sender, ChannelErrorEventArgs e) { base.OnError(sender, e); Console.WriteLine(e.Exception.Message); } protected override void OnConnected(object sender, ChannelEventArgs e) { base.OnConnected(sender, e); Console.WriteLine("{0} connected", e.Channel.EndPoint); } protected override void OnDisposed(object sender, ChannelDisposedEventArgs e) { base.OnDisposed(sender, e); Console.WriteLine("{0} disposed", e.Channel.EndPoint); } }

每秒获取一次CPU的使用情况,并把信息以json的方式发送给当前所有在线的连接.

下载

完整代码:ProcessorsMonitor.rar (686.02 kb) 

演示地址:http://html5.ikende.com/ProcessorsMonitor.htm (浏览器使用chrome或IE10)

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