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// Copyright 2014 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package handler
import (
"encoding/base64"
"fmt"
"html"
"html/template"
"io"
"log/slog"
"net/http"
"strconv"
"time"
"github.com/prometheus/common/model"
"github.com/prometheus/common/version"
dto "github.com/prometheus/client_model/go"
"github.com/prometheus/pushgateway/histogram"
"github.com/prometheus/pushgateway/storage"
)
type data struct {
MetricGroups storage.GroupingKeyToMetricGroup
Flags map[string]string
BuildInfo map[string]string
Birth time.Time
PathPrefix string
counter int
}
func (d *data) Count() int {
d.counter++
return d.counter
}
func (data) FormatTimestamp(ts int64) string {
return time.Unix(ts/1000, ts%1000*1000000).String()
}
// Status serves the status page.
//
// The returned handler is already instrumented for Prometheus.
func Status(
ms storage.MetricStore,
root http.FileSystem,
flags map[string]string,
pathPrefix string,
logger *slog.Logger,
) http.Handler {
birth := time.Now()
return InstrumentWithCounter(
"status",
http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
t := template.New("status")
t.Funcs(template.FuncMap{
"value": func(f float64) string {
return strconv.FormatFloat(f, 'f', -1, 64)
},
"timeFormat": func(t time.Time) string {
return t.Format(time.RFC3339)
},
"base64": func(s string) string {
return base64.RawURLEncoding.EncodeToString([]byte(s))
},
"formatHistogram": func(m *dto.Histogram) string {
h, fh := histogram.NewModelHistogram(m)
if h == nil {
return fh.String()
}
return h.String()
},
"add": func(x, y int) int {
return x + y
},
"formatLabelName": func(s string) string {
if !model.LabelName(s).IsValidLegacy() {
return fmt.Sprintf("%q", s)
}
return s
},
})
f, err := root.Open("template.html")
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
logger.Error("error loading template.html", "err", err.Error())
return
}
defer f.Close()
tpl, err := io.ReadAll(f)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
logger.Error("error reading template.html", "err", err.Error())
return
}
_, err = t.Parse(string(tpl))
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
logger.Error("error parsing template", "err", err.Error())
return
}
buildInfo := map[string]string{
"version": version.Version,
"revision": version.Revision,
"branch": version.Branch,
"buildUser": version.BuildUser,
"buildDate": version.BuildDate,
"goVersion": version.GoVersion,
}
if pathPrefix == "" {
pathPrefix = "."
}
d := &data{
MetricGroups: ms.GetMetricFamiliesMap(),
BuildInfo: buildInfo,
Birth: birth,
PathPrefix: pathPrefix,
Flags: flags,
}
err = t.Execute(w, d)
if err != nil {
// Hack to get a visible error message right at the top.
fmt.Fprintf(w, `<div id="template-error" class="alert alert-danger">Error executing template: %s</div>`, html.EscapeString(err.Error()))
fmt.Fprintln(w, `<script>$("#template-error").prependTo("body")</script>`)
}
}),
)
}
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