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viewer.go
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package main
import (
"html/template"
"net/http"
"time"
"github.com/leoluk/perflib_exporter/collector"
"github.com/leoluk/perflib_exporter/perflib"
)
type dumpHandlerTpl struct {
Objects *[]*perflib.PerfObject
Query string
QueryTime time.Duration
Count int
}
func queryFromRequest(r *http.Request, defaultVal string) string {
if val, ok := r.URL.Query()["query"]; ok {
if val[0] == "_default_" {
defaultVal = defaultQuery
} else {
defaultVal = val[0]
}
}
return defaultVal
}
func dumpHandler(w http.ResponseWriter, r *http.Request) {
query := queryFromRequest(r, "Global")
// TODO: document params
tStart := time.Now()
objects, err := perflib.QueryPerformanceData(query)
tEnd := time.Now()
queryTime := tEnd.Sub(tStart)
count := 0
for _, o := range objects {
for _, i := range o.Instances {
for range i.Counters {
count += 1
}
}
}
data := dumpHandlerTpl{
Query: query,
QueryTime: queryTime,
Count: count,
}
if _, ok := r.URL.Query()["no_sort"]; !ok {
perflib.SortObjects(objects)
}
data.Objects = &objects
if err != nil {
panic(err)
}
t := template.New("dump").Funcs(template.FuncMap{
"mangle": collector.MakePrometheusLabel,
"has_labels": collector.HasPromotedLabels,
"labels": func(n uint, instance *perflib.PerfInstance) map[string]string {
m := make(map[string]string)
labels := collector.PromotedLabelsForObject(n)
values := collector.PromotedLabelValuesForInstance(n, instance)
for i, v := range labels {
m[v] = values[i]
}
return m
},
})
t, err = t.Parse(`<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>perflib_exporter dump</title>
</head>
<body>
<h1>perflib_exporter dump</h1>
<p>Query: {{ .Query }}</p>
<p>Object count: {{ .Objects | len }}</p>
<p>Metric count: {{ .Count }}</p>
<p>Query duration: {{ .QueryTime }}</p>
<ul>
{{ range .Objects }}
<li><a href="#{{ .NameIndex }}">[{{ .NameIndex }}] {{ .Name }}</a></li>
{{ end }}
</ul>
{{ range .Objects }}
<h3 id="{{ .NameIndex }}">[{{ .NameIndex }}] {{ .Name }}</h3>
<table border="1">
<tr>
<th>Name</th>
<th>Mangled name</th>
<th>Type</th>
<th>IsCounter</th>
<th>IsNsCtr</th>
<th>Value</th>
<th>Help Text</th>
</tr>
{{ with index .Instances 0 }}
{{ range .Counters }}
<tr>
{{ with .Def }}
<td>[{{ .NameIndex }}] {{ .Name }}</td>
<td>{{ . | mangle }}</td>
<td>0x{{ .CounterType | printf "%x" }}</td>
<td>{{ .IsCounter }}</td>
<td>{{ .IsNanosecondCounter }}</td>
{{ end }}
<td>{{ .Value }}</td>
<td>{{ .Def.HelpText }}</td>
</tr>
{{ end }}
{{ end }}
</table>
<p></p>
{{ $num := len .Instances }}
{{ $objIdx := .NameIndex }}
{{ $hasLabels := has_labels $objIdx }}
{{ if gt $num 1 }}
Instances:
<ul>
{{ range .Instances }}
{{ if $hasLabels }}
<li>name=<b>{{ .Name }}</b>
{{ range $k, $v := labels $objIdx . }}
{{ $k }}={{ $v }}
{{ end }}
</li>
{{ else }}
<li>{{ .Name }}</li>
{{ end }}
{{ end }}
</ul>
{{ end }}
{{ end }}
</body>
</html>`)
if err != nil {
panic(err)
}
t.Execute(w, data)
}