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content.go
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package main
import (
"encoding/json"
"errors"
"fmt"
"html/template"
"net/http"
"runtime"
"strings"
"github.com/prometheus/common/version"
"gopkg.in/yaml.v3"
)
const (
docsUrl = "https://github.com/peekjef72/httpapi_exporter#readme"
templates = `
{{ define "page" -}}
<html>
<head>
<title>Prometheus {{ .ExporterName }}</title>
<style type="text/css">
body { margin: 0; font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; font-size: 14px; line-height: 1.42857143; color: #333; background-color: #fff; }
.navbar { display: flex; background-color: #222; margin: 0; border-width: 0 0 1px; border-style: solid; border-color: #080808; }
.navbar > * { margin: 0; padding: 15px; }
.navbar * { line-height: 20px; color: #9d9d9d; }
.navbar a { text-decoration: none; }
.navbar a:hover, .navbar a:focus { color: #fff; }
.navbar-header { font-size: 18px; }
body > * { margin: 15px; padding: 0; }
pre { padding: 10px; font-size: 13px; background-color: #f5f5f5; border: 1px solid #ccc; }
h1, h2 { font-weight: 500; }
a { color: #337ab7; }
a:hover, a:focus { color: #23527c; }
table { border: 1px solid #edd2e6; border-collapse: collapse; margin-bottom: 1rem; width: 80%; }
tr { border: 1px solid #edd2e6; padding: 0.3rem; text-align: left; width: 35%; }
th { border: 1px solid #edd2e6; padding: 0.3rem; }
td { border: 1px solid #edd2e6; padding: 0.3rem; }
.odd { background-color: rgba(0,0,0,.05); }
</style>
</head>
<body>
<div class="navbar">
<div class="navbar-header"><a href="/">Prometheus {{ .ExporterName }}</a></div>
<div><a href="/health">Health</a></div>
<div><a href="{{ .MetricsPath }}">Metrics</a></div>
<div><a href="/config">Configuration</a></div>
<div><a href="/targets">Targets</a></div>
<div><a href="/loglevel">loglevel</a></div>
<div><a href="/status">Status</a></div>
<div><a href="/debug/pprof">Profiling</a></div>
<div><a href="/httpapi_exporter_metrics">Exporter Metrics</a></div>
<div><a href="{{ .DocsUrl }}">Help</a></div>
</div>
{{template "content" .}}
</body>
</html>
{{- end }}
{{ define "content.home" -}}
<p>This is a <a href="{{ .DocsUrl }}">Prometheus {{ .ExporterName }}</a> instance.
You are probably looking for its <a href="{{ .MetricsPath }}">metrics</a> handler.</p>
{{- end }}
{{ define "content.health" -}}
<H2>{{ .Message }}</H2>
{{- end }}
{{ define "content.config" -}}
<h2>Configuration</h2>
<pre>{{ .Config }}</pre>
{{- end }}
{{ define "content.targets" -}}
<h2>Targets</h2>
<pre>{{ .Targets }}</pre>
{{- end }}
{{ define "content.status" -}}
<h2>Build Information</h2>
<table>
<tbody>
<tr class="odd" >
<th>Version</th>
<td>{{ .Version.Version }}</td>
</tr>
<tr>
<th>Revision</th>
<td>{{ .Version.Revision }}</td>
</tr>
<tr class="odd" >
<th>Branch</th>
<td>{{ .Version.Branch }}</td>
</tr>
<tr>
<th>BuildUser</th>
<td>{{ .Version.BuildUser }}</td>
</tr>
<tr class="odd" >
<th>BuildDate</th>
<td>{{ .Version.BuildDate }}</td>
</tr>
<tr>
<th>GoVersion</th>
<td>{{ .Version.GoVersion }}</td>
</tr>
<tr class="odd" >
<th>Server start</th>
<td>{{ .Version.StartTime }}</td>
</tr>
<tr>
<th>Server last reload</th>
<td>{{ .Version.ReloadTime }}</td>
</tr>
</tbody>
</table>
{{- end }}
{{ define "content.error" -}}
<h2>Error</h2>
<pre>{{ .Err }}</pre>
{{- end }}
`
)
type versionInfo struct {
Version string `json:"version"`
Revision string `json:"revision"`
Branch string `json:"branch"`
BuildUser string `json:"build_user"`
BuildDate string `json:"build_date"`
GoVersion string `json:"go_version"`
StartTime string `json:"start_time"`
ReloadTime string `json:"reload_time"`
}
type tdata struct {
ExporterName string
MetricsPath string
DocsUrl string
// `/config` only
Config string
// `/targets` only
Targets string
// status
Version versionInfo
// health - loglevel
Message string
// `/error` only
Err error
}
var (
allTemplates = template.Must(template.New("").Parse(templates))
healthTemplate = pageTemplate("health")
homeTemplate = pageTemplate("home")
configTemplate = pageTemplate("config")
targetsTemplate = pageTemplate("targets")
statusTemplate = pageTemplate("status")
errorTemplate = pageTemplate("error")
)
func pageTemplate(name string) *template.Template {
pageTemplate := fmt.Sprintf(`{{define "content"}}{{template "content.%s" .}}{{end}}{{template "page" .}}`, name)
return template.Must(template.Must(allTemplates.Clone()).Parse(pageTemplate))
}
// HomeHandlerFunc is the HTTP handler for the home page (`/`).
func HomeHandlerFunc(metricsPath string, exporter Exporter) func(http.ResponseWriter, *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
homeTemplate.Execute(w, &tdata{
ExporterName: exporter.Config().Globals.ExporterName,
MetricsPath: metricsPath,
DocsUrl: docsUrl,
})
}
}
func HealthHandlerfunc(metricsPath string, exporter Exporter) func(http.ResponseWriter, *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
var status []byte
accept_type := r.Header.Get(acceptHeader)
if strings.Contains(accept_type, applicationJSON) {
w.Header().Set(contentTypeHeader, applicationJSON)
status = []byte(`{"message":"ok","status": 1,"data": {"status":"ok"}}`)
w.Header().Set(contentLengthHeader, fmt.Sprint(len(status)))
} else if strings.Contains(accept_type, textPLAIN) {
w.Header().Set(contentTypeHeader, textPLAIN)
status = []byte("OK")
} else {
w.Header().Set(contentTypeHeader, textHTML)
healthTemplate.Execute(w, &tdata{
ExporterName: exporter.Config().Globals.ExporterName,
MetricsPath: metricsPath,
DocsUrl: docsUrl,
Message: "OK",
})
return
}
w.Write(status)
}
}
// ConfigHandlerFunc is the HTTP handler for the `/config` page. It outputs the configuration marshaled in YAML format.
func ConfigHandlerFunc(metricsPath string, exporter Exporter) func(http.ResponseWriter, *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
accept_type := r.Header.Get(acceptHeader)
if strings.Contains(accept_type, applicationJSON) {
conf, err := exporter.Config().JSON()
if err != nil {
HandleError(0, err, metricsPath, exporter, w, r)
return
}
w.Header().Set(contentTypeHeader, applicationJSON)
w.Header().Set(contentLengthHeader, fmt.Sprint(len(conf)))
w.Write(conf)
} else {
config, err := exporter.Config().YAML()
if err != nil {
HandleError(0, err, metricsPath, exporter, w, r)
return
}
configTemplate.Execute(w, &tdata{
ExporterName: exporter.Config().Globals.ExporterName,
MetricsPath: metricsPath,
DocsUrl: docsUrl,
Config: string(config),
})
}
}
}
// ReloadHandlerFunc is the HTTP handler for the POST reload entry point (`/reload`).
func ReloadHandlerFunc(metricsPath string, exporter Exporter, reloadCh chan<- actionMsg) func(http.ResponseWriter, *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
var result []byte
if r.Method != "POST" {
exporter.Logger().Info(
"received invalid method on /reload", "client", r.RemoteAddr)
HandleError(http.StatusMethodNotAllowed, errors.New("this endpoint requires a POST request"), metricsPath, exporter, w, r)
return
}
exporter.Logger().Info(
"received /reload from %s", "client", r.RemoteAddr)
msg := actionMsg{
actiontype: ACTION_RELOAD,
retCh: make(chan error),
}
reloadCh <- msg
if err := <-msg.retCh; err != nil {
HandleError(http.StatusInternalServerError, err, metricsPath, exporter, w, r)
}
accept_type := r.Header.Get(acceptHeader)
if strings.Contains(accept_type, applicationJSON) {
accept_type = applicationJSON
} else if strings.Contains(accept_type, textPLAIN) {
accept_type = textPLAIN
} else {
accept_type = textHTML
}
switch accept_type {
case textPLAIN:
w.Header().Set(contentTypeHeader, textPLAIN)
result = []byte(`OK reload asked.`)
case applicationJSON:
w.Header().Set(contentTypeHeader, applicationJSON)
result = []byte(`{"message":"ok","status": 1,"data": {"reload": true}}`)
w.Header().Set(contentLengthHeader, fmt.Sprint(len(result)))
default:
w.Header().Set(contentTypeHeader, textHTML)
healthTemplate.Execute(w, &tdata{
ExporterName: exporter.Config().Globals.ExporterName,
MetricsPath: metricsPath,
DocsUrl: docsUrl,
Message: `OK reload asked.`,
})
return
}
w.Write(result)
}
}
// LogLevelHandlerFunc is the HTTP handler for the POST loglevel entry point (`/loglevel`).
func LogLevelHandlerFunc(metricsPath string, exporter Exporter, reloadCh chan<- actionMsg, path string) func(http.ResponseWriter, *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
var result []byte
exporter.Logger().Info(
"received /loglevel", "client", r.RemoteAddr)
accept_type := r.Header.Get(acceptHeader)
if strings.Contains(accept_type, applicationJSON) {
accept_type = applicationJSON
} else if strings.Contains(accept_type, textPLAIN) {
accept_type = textPLAIN
} else {
accept_type = textHTML
}
switch r.Method {
case "GET":
switch accept_type {
case textPLAIN:
w.Header().Set(contentTypeHeader, textPLAIN)
result = []byte(
fmt.Sprintf("loglevel is currently set to %s", exporter.GetLogLevel()))
case applicationJSON:
w.Header().Set(contentTypeHeader, applicationJSON)
result = []byte(
fmt.Sprintf(`{"message":"ok","status": 1,"data": {"loglevel": "%s"}}`, exporter.GetLogLevel()))
w.Header().Set(contentLengthHeader, fmt.Sprint(len(result)))
default:
w.Header().Set(contentTypeHeader, textHTML)
healthTemplate.Execute(w, &tdata{
ExporterName: exporter.Config().Globals.ExporterName,
MetricsPath: metricsPath,
DocsUrl: docsUrl,
Message: fmt.Sprintf("loglevel is currently set to %s", exporter.GetLogLevel()),
})
return
}
w.Write(result)
case "POST":
ctxval, ok := r.Context().Value(ctxKey{}).(*ctxValue)
if !ok {
err := errors.New("invalid context received")
HandleError(http.StatusInternalServerError, err, metricsPath, exporter, w, r)
return
}
msg := actionMsg{
actiontype: ACTION_LOGLEVEL,
logLevel: strings.ToLower(ctxval.path),
retCh: make(chan error),
}
reloadCh <- msg
if err := <-msg.retCh; err != nil {
switch accept_type {
case textPLAIN:
w.Header().Set(contentTypeHeader, textPLAIN)
result = []byte(
fmt.Sprintf("OK loglevel set to %s", exporter.GetLogLevel()))
case applicationJSON:
w.Header().Set(contentTypeHeader, applicationJSON)
result = []byte(
fmt.Sprintf(`{"message":"ok","status": 1,"data": {"loglevel": "%s"}}`, exporter.GetLogLevel()))
w.Header().Set(contentLengthHeader, fmt.Sprint(len(result)))
default:
w.Header().Set(contentTypeHeader, textHTML)
healthTemplate.Execute(w, &tdata{
ExporterName: exporter.Config().Globals.ExporterName,
MetricsPath: metricsPath,
DocsUrl: docsUrl,
Message: fmt.Sprintf("OK loglevel set to %s", exporter.GetLogLevel()),
})
return
}
w.Write(result)
} else {
HandleError(http.StatusInternalServerError, errors.New("KO something wrong with increase loglevel"), metricsPath, exporter, w, r)
}
default:
exporter.Logger().Info(
"received invalid method on /loglevel", "client", r.RemoteAddr)
HandleError(http.StatusMethodNotAllowed, errors.New("this endpoint requires a GET or POST request"), metricsPath, exporter, w, r)
return
}
}
}
// StatusHandlerFunc is the HTTP handler for the `/status` page. It outputs the status of exporter.
func StatusHandlerFunc(metricsPath string, exporter Exporter) func(http.ResponseWriter, *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
vinfos := versionInfo{
Version: version.Version,
Revision: version.Revision,
Branch: version.Branch,
BuildUser: version.BuildUser,
BuildDate: version.BuildDate,
GoVersion: runtime.Version(),
StartTime: exporter.GetStartTime(),
ReloadTime: exporter.GetReloadTime(),
}
accept_type := r.Header.Get(acceptHeader)
if strings.Contains(accept_type, applicationJSON) {
res, err := json.Marshal(vinfos)
if err != nil {
HandleError(http.StatusBadRequest, err, metricsPath, exporter, w, r)
return
}
w.Header().Set(contentTypeHeader, applicationJSON)
w.Header().Set(contentLengthHeader, fmt.Sprint(len(res)))
w.WriteHeader(http.StatusOK)
w.Write(res)
} else {
w.Header().Set(contentTypeHeader, textHTML)
statusTemplate.Execute(w, &tdata{
ExporterName: exporter.Config().Globals.ExporterName,
MetricsPath: metricsPath,
DocsUrl: docsUrl,
Version: vinfos,
})
}
}
}
// TargetsHandlerFunc is the HTTP handler for the `/target` page. It outputs the targets configuration marshaled in YAML format.
func TargetsHandlerFunc(metricsPath string, exporter Exporter) func(http.ResponseWriter, *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
type targets struct {
Tgs []*TargetConfig `yaml:"targets" json:"targets"`
}
var (
tgs *targets
targets_cfg []byte
err error
)
ctxval, ok := r.Context().Value(ctxKey{}).(*ctxValue)
if !ok {
err := errors.New("invalid context received")
HandleError(http.StatusInternalServerError, err, metricsPath, exporter, w, r)
return
}
c := exporter.Config()
if ctxval.path != "" {
if tg, err := exporter.FindTarget(ctxval.path); err == nil {
tgl := make([]*TargetConfig, 1)
tgl[0] = tg.Config()
tgs = &targets{
Tgs: tgl,
}
} else {
HandleError(http.StatusNotFound, errors.New(`target not found`), metricsPath, exporter, w, r)
return
}
} else {
tgs = &targets{
Tgs: c.Targets,
}
}
accept_type := r.Header.Get(acceptHeader)
if strings.Contains(accept_type, applicationJSON) {
targets_cfg, err = json.Marshal(tgs)
if err != nil {
HandleError(0, err, metricsPath, exporter, w, r)
return
}
w.Header().Set(contentTypeHeader, applicationJSON)
w.Header().Set(contentLengthHeader, fmt.Sprint(len(targets_cfg)))
w.WriteHeader(http.StatusOK)
w.Write(targets_cfg)
} else {
targets_cfg, err = yaml.Marshal(c.Targets)
if err != nil {
HandleError(0, err, metricsPath, exporter, w, r)
return
}
w.Header().Set(contentTypeHeader, textHTML)
targetsTemplate.Execute(w, &tdata{
ExporterName: exporter.Config().Globals.ExporterName,
MetricsPath: metricsPath,
DocsUrl: docsUrl,
Targets: string(targets_cfg),
})
}
}
}
// HandleError is an error handler that other handlers defer to in case of error. It is important to not have written
// anything to w before calling HandleError(), or the 500 status code won't be set (and the content might be mixed up).
func HandleError(status int, err error, metricsPath string, exporter Exporter, w http.ResponseWriter, r *http.Request) {
if status == 0 {
status = http.StatusInternalServerError
}
w.WriteHeader(status)
errorTemplate.Execute(w, &tdata{
ExporterName: exporter.Config().Globals.ExporterName,
MetricsPath: metricsPath,
DocsUrl: docsUrl,
Err: err,
})
}