mirror of https://github.com/prometheus/prometheus
201 lines
5.4 KiB
Go
201 lines
5.4 KiB
Go
// Copyright 2013 Prometheus Team
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package web
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import (
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"flag"
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"fmt"
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"html/template"
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"io/ioutil"
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"net"
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"net/http"
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"os"
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"time"
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pprof_runtime "runtime/pprof"
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"github.com/golang/glog"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/prometheus/web/api"
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"github.com/prometheus/prometheus/web/blob"
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)
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// Commandline flags.
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var (
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listenAddress = flag.String("web.listen-address", ":9090", "Address to listen on for web interface.")
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useLocalAssets = flag.Bool("web.use-local-assets", false, "Read assets/templates from file instead of binary.")
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userAssetsPath = flag.String("web.user-assets", "", "Path to static asset directory, available at /user.")
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enableQuit = flag.Bool("web.enable-remote-shutdown", false, "Enable remote service shutdown.")
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)
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// WebService handles the HTTP endpoints with the exception of /api.
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type WebService struct {
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StatusHandler *PrometheusStatusHandler
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MetricsHandler *api.MetricsService
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AlertsHandler *AlertsHandler
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ConsolesHandler *ConsolesHandler
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QuitDelegate func()
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}
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// ServeForever serves the HTTP endpoints and only returns upon errors.
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func (ws WebService) ServeForever() error {
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http.Handle("/favicon.ico", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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http.Error(w, "", 404)
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}))
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http.Handle("/", prometheus.InstrumentHandler(
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"/", ws.StatusHandler,
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))
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http.Handle("/alerts", prometheus.InstrumentHandler(
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"/alerts", ws.AlertsHandler,
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))
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http.Handle("/consoles/", prometheus.InstrumentHandler(
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"/consoles/", http.StripPrefix("/consoles/", ws.ConsolesHandler),
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))
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http.Handle("/graph", prometheus.InstrumentHandler(
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"/graph", http.HandlerFunc(graphHandler),
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))
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http.Handle("/heap", prometheus.InstrumentHandler(
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"/heap", http.HandlerFunc(dumpHeap),
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))
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ws.MetricsHandler.RegisterHandler()
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http.Handle("/metrics", prometheus.Handler())
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if *useLocalAssets {
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http.Handle("/static/", prometheus.InstrumentHandler(
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"/static/", http.StripPrefix("/static/", http.FileServer(http.Dir("web/static"))),
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))
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} else {
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http.Handle("/static/", prometheus.InstrumentHandler(
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"/static/", http.StripPrefix("/static/", new(blob.Handler)),
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))
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}
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if *userAssetsPath != "" {
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http.Handle("/user/", prometheus.InstrumentHandler(
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"/user/", http.StripPrefix("/user/", http.FileServer(http.Dir(*userAssetsPath))),
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))
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}
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if *enableQuit {
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http.Handle("/-/quit", http.HandlerFunc(ws.quitHandler))
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}
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glog.Info("listening on ", *listenAddress)
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return http.ListenAndServe(*listenAddress, nil)
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}
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func (ws WebService) quitHandler(w http.ResponseWriter, r *http.Request) {
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if r.Method != "POST" {
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w.Header().Add("Allow", "POST")
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w.WriteHeader(http.StatusMethodNotAllowed)
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return
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}
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fmt.Fprintf(w, "Requesting termination... Goodbye!")
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ws.QuitDelegate()
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}
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func getTemplateFile(name string) (string, error) {
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if *useLocalAssets {
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file, err := ioutil.ReadFile(fmt.Sprintf("web/templates/%s.html", name))
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if err != nil {
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glog.Errorf("Could not read %s template: %s", name, err)
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return "", err
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}
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return string(file), nil
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}
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file, err := blob.GetFile(blob.TemplateFiles, name+".html")
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if err != nil {
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glog.Errorf("Could not read %s template: %s", name, err)
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return "", err
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}
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return string(file), nil
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}
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func getConsoles() string {
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if _, err := os.Stat(*consoleTemplatesPath + "/index.html"); !os.IsNotExist(err) {
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return "/consoles/index.html"
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}
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if *userAssetsPath != "" {
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if _, err := os.Stat(*userAssetsPath + "/index.html"); !os.IsNotExist(err) {
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return "/user/index.html"
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}
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}
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return ""
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}
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func getTemplate(name string) (t *template.Template, err error) {
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t = template.New("_base")
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t.Funcs(template.FuncMap{
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"since": time.Since,
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"getConsoles": getConsoles,
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})
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file, err := getTemplateFile("_base")
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if err != nil {
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glog.Error("Could not read base template: ", err)
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return nil, err
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}
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t.Parse(file)
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file, err = getTemplateFile(name)
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if err != nil {
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glog.Error("Could not read base template: ", err)
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return nil, err
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}
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t.Parse(file)
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return
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}
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func executeTemplate(w http.ResponseWriter, name string, data interface{}) {
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tpl, err := getTemplate(name)
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if err != nil {
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glog.Error("Error preparing layout template: ", err)
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return
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}
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err = tpl.Execute(w, data)
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if err != nil {
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glog.Error("Error executing template: ", err)
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}
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}
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func dumpHeap(w http.ResponseWriter, r *http.Request) {
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target := fmt.Sprintf("/tmp/%d.heap", time.Now().Unix())
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f, err := os.Create(target)
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if err != nil {
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glog.Error("Could not dump heap: ", err)
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}
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fmt.Fprintf(w, "Writing to %s...", target)
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defer f.Close()
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pprof_runtime.WriteHeapProfile(f)
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fmt.Fprintf(w, "Done")
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}
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// MustBuildServerURL returns the server URL and panics in case an error occurs.
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func MustBuildServerURL() string {
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_, port, err := net.SplitHostPort(*listenAddress)
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if err != nil {
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panic(err)
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}
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hostname, err := os.Hostname()
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if err != nil {
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panic(err)
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}
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return fmt.Sprintf("http://%s:%s", hostname, port)
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}
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