nGrinder源码分析：详细报告页数据展示

0.背景

当你查看nGrinder详细报告页，会展示性能数据结果和时序图，这些内部是怎么实现的呢？本文将分析源码，给你一个清晰的认识。

1.源码分析

当你请求 http://ip/perftest/{testid}/detail_report; 查看详细报告页时，Controller端将请求转给perftest/detail_report模板(ngrinder-controller/src/main/webapp/WEB-INF/ftl/perftest/detail_report.ftl ):

/**
 * Get the detailed perf test report.
 *
 * @param model model
 * @param id    test id
 * @return perftest/detail_report
 *
 * 返回给detail_report.ftl
 */
@SuppressWarnings("MVCPathVariableInspection")
@RequestMapping(value = {"/{id}/detail_report", /** for backward compatibility */"/{id}/report"})
public String getReport(ModelMap model, @PathVariable("id") long id) {
    model.addAttribute("test", perfTestService.getOne(id));
    model.addAttribute("plugins", perfTestService.getAvailableReportPlugins(id));
    return "perftest/detail_report";
}

model.addAttribute("test", perfTestService.getOne(id));

ModelMap:构建model数据给前端的Map

addAttribute:添加指定名对应的属性

perfTestService.getOne(id):获取对应测试id下的Perftest（性能统计数据model）实例

detail_report.ftl中可以根据test获取PerfTest成员变量值

detail_report.ftl模板中数据展示分成两大部分：

1-1. 第一部分：DB数据

DB：h2, 文件保存路径：/root/.ngrinder/db

detail_report.ftl局部代码示例：

<tr>
    <th><@spring.message "perfTest.report.totalVusers"/>th>
    <td><strong>${test.vuserPerAgent * test.agentCount}strong>td>
tr>

test.vuserPerAgent 是根据perfTestService.getOne(id)，从DB中获取PerfTest实例，前端直接展示成员变量值。

2-2. 第二部分：文件数据

第二部分标签为detail_panel；默认为perfMenu

JS脚本：

"detail_panel">
div>

<#-- 左下，执行报告，目标服务器，PLUGINS -->
<script>
    $(document).ready(function () {
        var $perfMenu = $("li.perf");
        var $monitorMenu = $("li.monitor");
        var $pluginMenu = $("li.plugin");

        $perfMenu.click(function () {
            $("#detail_panel").load("${req.getContextPath()}/perftest/${(test.id)?c}/detail_report/perf");
            changActiveLink($(this));
        });

        $monitorMenu.click(function () {
            $("#detail_panel").load("${req.getContextPath()}/perftest/${(test.id)?c}/detail_report/monitor?targetIP=" + $(this).attr("ip"));
            changActiveLink($(this));
        });
        $pluginMenu.click(function () {
            $("#detail_panel").load("${req.getContextPath()}/perftest/${(test.id)?c}/detail_report/plugin/" + $(this).attr("plugin") +
                    "?kind=" + $(this).attr("ip"));
            changActiveLink($(this));
        });

        $.ajaxSetup({"cache": false});
        $perfMenu.click();
    });

    function changActiveLink(obj) {
        $("li.active").removeClass("active");
        obj.addClass("active");
    }

script>

执行报告请求：
${req.getContextPath()}/perftest/${(test.id)?c}/detail_report/perf

对应的Controller:

/**
 * Get the detailed perf test report.
 *
 * @param id test id
 * @return perftest/detail_report/perf
 */
@SuppressWarnings({"MVCPathVariableInspection", "UnusedParameters"})
@RequestMapping("/{id}/detail_report/perf")
public String getDetailPerfReport(@PathVariable("id") long id) {
    return "perftest/detail_report/perf";

映射到ngrinder-controller/src/main/webapp/WEB-INF/ftl/perftest/detail_report/perf.ftl模板

class="bigchart" id="tps_chart">div>
<h6><@spring.message "perfTest.report.header.meantime"/> (ms)h6>
<div class="chart" id="mean_time_chart">div>
<h6 id="min_time_first_byte_chart_header"><@spring.message "perfTest.report.header.meantimeToFirstByte"/> (ms)h6>
<div class="chart" id="min_time_first_byte_chart">div>
<h6 id="vuser_chart_header"><@spring.message "perfTest.report.header.vuser"/>h6>
<div class="chart" id="vuser_chart">div>
<h6 id="user_defined_chart_header"><@spring.message "perfTest.report.header.userDefinedChart"/>h6>
<div class="chart" id="user_defined_chart">div>
<h6><@spring.message "perfTest.report.header.errors"/>h6>
<div class="chart" id="error_chart">div>

<script>

    //@ sourceURL=/perftest/detail_report/perf
    $("#tps_title").popover({trigger: 'hover', container:'body'});

    function getGraphDataAndDraw(testId) {
        var ajaxObj = new AjaxObj("/perftest/api/" + testId + "/perf");
        ajaxObj.params = {
            dataType : 'TPS,Errors,Mean_Test_Time_(ms),Mean_time_to_first_byte,User_defined,Vuser',
            imgWidth : parseInt($("#tps_chart").width())
        };
        ajaxObj.success = function (data) {
            var interval = data.chartInterval;
            drawChart("tps_chart", data.TPS.data, interval, data.TPS.labels);
            drawChart("mean_time_chart", data.Mean_Test_Time_ms.data, interval, data.Mean_Test_Time_ms.labels);
            drawChart('vuser_chart', data.Vuser.data, interval, data.Vuser.labels);
            drawChart('error_chart', data.Errors.data, interval, data.Errors.labels);
            drawOptionalChart("min_time_first_byte_chart", data.Mean_time_to_first_byte.data, interval,
                    data.Mean_time_to_first_byte.labels);
            drawOptionalChart("user_defined_chart", data.User_defined.data, interval, data.User_defined.labels);
            createChartExportButton("<@spring.message "perfTest.report.exportImg.button"/>", "<@spring.message "perfTest.report.exportImg.title"/>");
        };
        ajaxObj.call();
    }
    function drawChart(id, data, interval, labels) {
        new Chart(id, data, interval, { labels: labels }).plot();
    }
    function drawOptionalChart(id, data, interval, labels) {
        if (data !== undefined && data.length != 0) {
            drawChart(id, data, interval, labels);
        } else {
            $("#" + id).hide();
            $("#" + id + "_header").hide();
        }
    }
    $("#download_csv").click(function () {
        document.forms.download_csv_form.action = "${req.getContextPath()}/perftest/${id}/download_csv";
        document.forms.download_csv_form.submit();
    });
    getGraphDataAndDraw(${id});

script>

注意: var ajaxObj = new AjaxObj("/perftest/api/" + testId + "/perf");

去请求了@RequestMapping({"/api/{id}/perf", "/api/{id}/graph"})

/**
     * Get the detailed report graph data for the given perf test id.
     * This method returns the appropriate points based on the given imgWidth.
     *
     * @param id       test id
     * @param dataType which data
     * @param imgWidth imageWidth
     * @return json string.
     */
    @SuppressWarnings("MVCPathVariableInspection")
    @RestAPI
    @RequestMapping({"/api/{id}/perf", "/api/{id}/graph"})
    public HttpEntity getPerfGraph(@PathVariable("id") long id,
                                           @RequestParam(required = true, defaultValue = "") String dataType,
                                           @RequestParam(defaultValue = "false") boolean onlyTotal,
                                           @RequestParam int imgWidth) {
        String[] dataTypes = checkNotEmpty(StringUtils.split(dataType, ","), "dataType argument should be provided");
        return toJsonHttpEntity(getPerfGraphData(id, dataTypes, onlyTotal, imgWidth));
    }

其中：getPerfGraphData(id, dataTypes, onlyTotal, imgWidth)根据*.data文件获取数据(*.data是在你执行性能测试时，将采集的性能数据写到对应路径下的文件，路径：`/root/.ngrinder/perftest/0_999/$testid/report`)

getPerfGraphData(id, dataTypes, onlyTotal, imgWidth):

    private Map getPerfGraphData(Long id, String[] dataTypes, boolean onlyTotal, int imgWidth) {
        final PerfTest test = perfTestService.getOne(id);
        int interval = perfTestService.getReportDataInterval(id, dataTypes[0], imgWidth);
        Map resultMap = Maps.newHashMap();
        for (String each : dataTypes) {
            Pair, ArrayList> tpsResult = perfTestService.getReportData(id, each, onlyTotal, interval);
            Map dataMap = Maps.newHashMap();
            dataMap.put("labels", tpsResult.getFirst());
            dataMap.put("data", tpsResult.getSecond());
            resultMap.put(StringUtils.replaceChars(each, "()", ""), dataMap);
        }
        resultMap.put(PARAM_TEST_CHART_INTERVAL, interval * test.getSamplingInterval());
        return resultMap;
    }

perfTestService.getReportData():

/**
 * Get list that contains test report data as a string.
 *
 * @param testId   test id
 * @param key      report key
 * @param onlyTotal true if only total show be passed
 * @param interval interval to collect data
 * @return list containing label and tps value list
 */
public Pair, ArrayList> getReportData(long testId, String key, boolean onlyTotal, int interval) {
    Pair, ArrayList> resultPair = Pair.of(new ArrayList(),
            new ArrayList());
    List reportDataFiles = onlyTotal ? Lists.newArrayList(getReportDataFile(testId, key)) : getReportDataFiles(testId, key);
    for (File file : reportDataFiles) {
        String buildReportName = buildReportName(key, file);
        if (key.equals(buildReportName)) {
            buildReportName = "Total";
        } else {
            buildReportName = buildReportName.replace("_", " ");
        }
        resultPair.getFirst().add(buildReportName);
        resultPair.getSecond().add(getFileDataAsJson(file, interval));
    }
    return resultPair;
}

// 读取*.data转换成son string
getFileDataAsJson(file, interval):

/**
     * Get the test report data as a json string.
     *
     * @param targetFile target file
     * @param interval   interval to collect data
     * @return json string
     */
    private String getFileDataAsJson(File targetFile, int interval) {
        if (!targetFile.exists()) {
            return "[]";
        }
        StringBuilder reportData = new StringBuilder("[");
        FileReader reader = null;
        BufferedReader br = null;
        try {
            reader = new FileReader(targetFile);
            br = new BufferedReader(reader);
            String data = br.readLine();
            int current = 0;
            while (StringUtils.isNotBlank(data)) {
                if (0 == current) {
                    reportData.append(data);
                    reportData.append(",");
                }
                if (++current >= interval) {
                    current = 0;
                }
                data = br.readLine();
            }
            if (reportData.charAt(reportData.length() - 1) == ',') {
                reportData.deleteCharAt(reportData.length() - 1);
            }
        } catch (IOException e) {
            LOGGER.error("Report data retrieval is failed: {}", e.getMessage());
            LOGGER.debug("Trace is : ", e);
        } finally {
            IOUtils.closeQuietly(reader);
            IOUtils.closeQuietly(br);
        }
        return reportData.append("]").toString();
    }

1-3.时序图数据接口与*data文件比对