Django Ajax动态图形监控

Ajax动态图形监控: 通过使用前端轮询的方式实现对主机动态图形监控.

先来定义index.html前端绘图代码.

代码语言：javascript复制

<script src="https://cdn.lyshark.com/jquery/3.5.1/jquery.min.js" type="text/javascript"></script>
<script src="https://cdn.lyshark.com/echarts/5.0.0/echarts.min.js" type="text/javascript"></script>

<!--定义绘图区域-->
<div id="main" style="height:300px;width:80%;border:1px solid #eecc11;padding:10px;"></div>

<!--调用百度的绘图库,进行图片的绘制工作.-->
<script type="text/javascript" charset="UTF-8">
    var display = function(time,cpu) {
        var main = echarts.init(document.getElementById(("main")));
        var option = {
            xAxis: {
                boundaryGap:false,
                boundaryGap:false,
                type: 'category',
                data: time
            },
            yAxis: {
                type: 'value'
            },
            series: [{
                type: 'line',
                areaStyle:{},
                data: cpu
            }]
        };
        main.setOption(option,true);
    };
</script>

<!--update()函数具体执行的任务,其主要只保留前十条数据.-->
<script type="text/javascript" charset="UTF-8">
    // 负责对参数的解析
    var time =["","","","","","","","","",""];
    var cpu = [0,0,0,0,0,0,0,0,0,0];
    var update = function(recv){
        time.push(recv.response[0]);
        cpu.push(parseFloat(recv.response[1]));
        if(time.length >=10){
            time.shift();
            cpu.shift();
            console.log("处理后的时间数据:"   time);
            console.log("处理后的CPU数据:"   cpu);
            display(time,cpu)  // 调用绘图函数
        }
    };
</script>

<!--设定一个定时器,每隔1000毫秒向后端发送请求-->
<script type="text/javascript">
    $(
        function () {
            fetchData();
            setInterval(fetchData, 1000);
        }
    );
    function fetchData(){
        $.ajax({
            url:"/_ajax/",
            type:"GET",
            dataType: 'json',
            success:function (recv) {
                console.log("获取到时间:"   recv.response[0]);
                console.log("获取到数据:"   recv.response[1]);
                update(recv)      // 传递给处理函数
            }
        })
    }
</script>

后端views.py视图层则是返回本机的实时数据给前台即可.

代码语言：javascript复制

from django.shortcuts import render,HttpResponse
import json,psutil,time

def index(request):
    return render(request,"index.html")

def _ajax(request):
    if request.method == "GET":
        times = time.strftime("%M:%S",time.localtime())
        data = psutil.cpu_percent(interval=None,percpu=True)
        return HttpResponse(json.dumps({"response":[times,data]}))

Ajax轮询多个图形: 我们来实现一次性绘制多个图形的方法,代码只是在上方改进一下即可.

前端部分index.html分别绘制两个仪表盘,并封装好绘图方法.

代码语言：javascript复制

<script src="https://cdn.lyshark.com/jquery/3.5.1/jquery.min.js"></script>
<script src="https://cdn.lyshark.com/echarts/5.0.0/echarts.min.js"></script>

<div id="cpuChart" style="width: 20%; height: 300px; border: 1px solid #dddddd; float:left; margin-right: 8px;"></div>
<div id="memChart" style="width: 20%; height: 300px; border: 1px solid #dddddd; float:left; margin-right: 8px;"></div>

<!--封装方法,一次性绘制两个图形-->
<script type="text/javascript" charset="UTF-8">
    var display = function(cpu,mem) {
        var cpuChart = echarts.init(document.getElementById("cpuChart"));
        var option = {
        series: [
            {
                type: 'gauge',
                detail: {formatter: '{value}%'},
                data: [{value: cpu, name: 'CPU'}]
            }
        ]
    };cpuChart.setOption(option, true);

        var memChart = echarts.init(document.getElementById("memChart"));
        var option = {
        series: [
            {
                type: 'gauge',
                detail: {formatter: '{value}%'},
                data: [{value: mem, name: 'Mem'}]
            }
        ]
    };memChart.setOption(option, true);
};
</script>

<!--定义轮巡-->
<script type="text/javascript">
    $(
        function () {
            fetchData();
            setInterval(fetchData, 500);
        }
    );
    function fetchData(){
        $.ajax({
            url:"/_ajax/",
            type:"GET",
            dataType: 'json',
            success:function (recv) {
                display(recv.response[0],recv.response[1]);
            }
        })
    }
</script>

后台views.py则是动态获取获取图形并轮询传递到前端.

代码语言：javascript复制

from django.shortcuts import render,HttpResponse
import json,psutil

def index(request):
    return render(request, "index.html")

def ajax(request):
    if request.method == "GET":
        mem = psutil.virtual_memory()
        cpu = psutil.cpu_percent()
        return HttpResponse(json.dumps({"response":[cpu,mem.percent]}))

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