Checkpoint
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213
stats/handler.go
Normal file
213
stats/handler.go
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package stats
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import (
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"encoding/json"
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"expvar"
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"fmt"
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"net/http"
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"sort"
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"strings"
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"html/template"
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)
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var (
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page = template.Must(template.New("").
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Funcs(template.FuncMap{"path": path, "duration": duration}).
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Parse(`<!DOCTYPE html>
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<html lang="us">
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<meta charset="utf-8">
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<title>Metrics report</title>
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<meta name="viewport" content="width=device-width">
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<style>
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* { margin: 0; padding: 0; box-sizing: border-box; font-family: monospace; font-size: 12px; }
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.container {
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max-width: 640px;
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margin: 1em auto;
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display: flex;
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flex-direction: column;
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padding: 0 1em;
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}
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h1 { text-align: center; }
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h2 {
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font-weight: normal;
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text-overflow: ellipsis;
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white-space: nowrap;
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overflow: hidden;
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}
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.metric {
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padding: 1em 0;
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border-top: 1px solid rgba(0,0,0,0.33);
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}
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.row {
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display: flex;
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flex-direction: row;
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align-items: center;
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margin: 0.25em 0;
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}
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.col-1 { flex: 1; }
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.col-2 { flex: 2.5; }
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.table { width: 100px; border-radius: 2px; border: 1px solid rgba(0,0,0,0.33); }
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.table td, .table th { text-align: center; }
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.timeline { padding: 0 0.5em; }
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path { fill: none; stroke: rgba(0,0,0,0.33); stroke-width: 1; stroke-linecap: round; stroke-linejoin: round; }
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path:last-child { stroke: black; }
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</style>
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<body>
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<div class="container">
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<div><h1><pre> __ __
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.--------..-----.| |_ .----.|__|.----..-----.
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| || -__|| _|| _|| || __||__ --|
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|__|__|__||_____||____||__| |__||____||_____|
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</pre></h1></div>
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{{ range . }}
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<div class="row metric">
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<h2 class="col-1">{{ .name }}</h2>
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<div class="col-2">
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{{ if .type }}
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<div class="row">
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{{ template "table" . }}
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<div class="col-1"></div>
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</div>
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{{ else if .interval }}
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<div class="row">{{ template "timeseries" . }}</div>
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{{ else if .metrics}}
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{{ range .metrics }}
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<div class="row">
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{{ template "timeseries" . }}
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</div>
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{{ end }}
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{{ end }}
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</div>
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</div>
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{{ end }}
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</div>
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</body>
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</html>
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{{ define "table" }}
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<table class="table col-1">
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{{ if eq .type "c" }}
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<thead><tr><th>count</th></tr></thead><tbody><tr><td>{{ printf "%.2g" .count }}</td></tr></tbody>
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{{ else if eq .type "g" }}
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<thead><tr><th>mean</th><th>min</th><th>max</th></tr></thead>
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<tbody><tr><td>{{printf "%.2g" .mean}}</td><td>{{printf "%.2g" .min}}</td><td>{{printf "%.2g" .max}}</td></th></tbody>
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{{ else if eq .type "h" }}
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<thead><tr><th>P.50</th><th>P.90</th><th>P.99</th></tr></thead>
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<tbody><tr><td>{{printf "%.2g" .p50}}</td><td>{{printf "%.2g" .p90}}</td><td>{{printf "%.2g" .p99}}</td></tr></tbody>
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{{ end }}
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</table>
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{{ end }}
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{{ define "timeseries" }}
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{{ template "table" .total }}
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<div class="col-1">
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<div class="row">
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<div class="timeline">{{ duration .samples .interval }}</div>
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<svg class="col-1" version="1.1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 20">
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{{ if eq (index (index .samples 0) "type") "c" }}
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{{ range (path .samples "count") }}<path d={{ . }} />{{end}}
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{{ else if eq (index (index .samples 0) "type") "g" }}
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{{ range (path .samples "min" "max" "mean" ) }}<path d={{ . }} />{{end}}
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{{ else if eq (index (index .samples 0) "type") "h" }}
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{{ range (path .samples "p50" "p90" "p99") }}<path d={{ . }} />{{end}}
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{{ end }}
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</svg>
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</div>
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</div>
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{{ end }}
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`))
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)
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func path(samples []any, keys ...string) []string {
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var min, max float64
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paths := make([]string, len(keys))
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for i := range len(samples) {
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s := samples[i].(map[string]any)
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for _, k := range keys {
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x := s[k].(float64)
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if i == 0 || x < min {
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min = x
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}
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if i == 0 || x > max {
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max = x
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}
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}
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}
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for i := range len(samples) {
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s := samples[i].(map[string]any)
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for j, k := range keys {
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v := s[k].(float64)
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x := float64(i+1) / float64(len(samples))
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y := (v - min) / (max - min)
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if max == min {
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y = 0
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}
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if i == 0 {
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paths[j] = fmt.Sprintf("M%f %f", 0.0, (1-y)*18+1)
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}
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paths[j] += fmt.Sprintf(" L%f %f", x*100, (1-y)*18+1)
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}
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}
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return paths
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}
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func duration(samples []any, n float64) string {
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n = n * float64(len(samples))
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if n < 60 {
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return fmt.Sprintf("%d sec", int(n))
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} else if n < 60*60 {
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return fmt.Sprintf("%d min", int(n/60))
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} else if n < 24*60*60 {
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return fmt.Sprintf("%d hrs", int(n/60/60))
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}
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return fmt.Sprintf("%d days", int(n/24/60/60))
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}
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// Handler returns an http.Handler that renders web UI for all provided metrics.
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func Handler(snapshot func() map[string]Metric) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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type h map[string]any
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metrics := []h{}
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for name, metric := range snapshot() {
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m := h{}
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b, _ := json.Marshal(metric)
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json.Unmarshal(b, &m)
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m["name"] = name
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metrics = append(metrics, m)
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}
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sort.Slice(metrics, func(i, j int) bool {
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n1 := metrics[i]["name"].(string)
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n2 := metrics[j]["name"].(string)
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return strings.Compare(n1, n2) < 0
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})
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page.Execute(w, metrics)
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})
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}
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// JSONHandler returns a [http.Handler] that renders the metrics as JSON.
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func JSONHandler(snapshot func() map[string]Metric) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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type h map[string]any
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metrics := map[string]h{}
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for name, metric := range snapshot() {
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m := h{}
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b, _ := json.Marshal(metric)
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json.Unmarshal(b, &m)
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metrics[name] = m
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}
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w.Header().Set("Content-Type", "application/json")
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json.NewEncoder(w).Encode(metrics)
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})
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}
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// Exposed returns a map of exposed metrics (see expvar package).
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func Exposed() map[string]Metric {
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m := map[string]Metric{}
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expvar.Do(func(kv expvar.KeyValue) {
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if metric, ok := kv.Value.(Metric); ok {
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m[kv.Key] = metric
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}
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})
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return m
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}
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