135 lines
3.9 KiB
Go
135 lines
3.9 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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"code.google.com/p/gorest"
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"flag"
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"fmt"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/exp"
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"github.com/prometheus/prometheus/web/api"
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"github.com/prometheus/prometheus/web/blob"
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"html/template"
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"log"
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"net/http"
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"net/http/pprof"
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)
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// Commandline flags.
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var (
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listenAddress = flag.String("listenAddress", ":9090", "Address to listen on for web interface.")
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useLocalAssets = flag.Bool("useLocalAssets", false, "Read assets/templates from file instead of binary.")
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userAssetsPath = flag.String("userAssets", "", "Path to static asset directory, available at /user")
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)
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type WebService struct {
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StatusHandler *StatusHandler
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DatabasesHandler *DatabasesHandler
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MetricsHandler *api.MetricsService
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}
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func (w WebService) ServeForever() error {
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gorest.RegisterService(w.MetricsHandler)
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exp.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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// TODO(julius): This will need to be rewritten once the exp package provides
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// the coarse mux behaviors via a wrapper function.
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exp.Handle("/debug/pprof/", http.HandlerFunc(pprof.Index))
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exp.Handle("/debug/pprof/cmdline", http.HandlerFunc(pprof.Cmdline))
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exp.Handle("/debug/pprof/profile", http.HandlerFunc(pprof.Profile))
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exp.Handle("/debug/pprof/symbol", http.HandlerFunc(pprof.Symbol))
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exp.Handle("/", w.StatusHandler)
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exp.Handle("/databases", w.DatabasesHandler)
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exp.HandleFunc("/graph", graphHandler)
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exp.Handle("/api/", gorest.Handle())
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exp.Handle("/metrics.json", prometheus.DefaultHandler)
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if *useLocalAssets {
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exp.Handle("/static/", http.StripPrefix("/static/", http.FileServer(http.Dir("web/static"))))
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} else {
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exp.Handle("/static/", http.StripPrefix("/static/", new(blob.Handler)))
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}
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if *userAssetsPath != "" {
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exp.Handle("/user/", http.StripPrefix("/user/", http.FileServer(http.Dir(*userAssetsPath))))
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}
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log.Printf("listening on %s", *listenAddress)
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return http.ListenAndServe(*listenAddress, exp.DefaultCoarseMux)
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}
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func getLocalTemplate(name string) (*template.Template, error) {
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return template.ParseFiles(
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"web/templates/_base.html",
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fmt.Sprintf("web/templates/%s.html", name),
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)
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}
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func getEmbeddedTemplate(name string) (*template.Template, error) {
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t := template.New("_base")
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file, err := blob.GetFile(blob.TemplateFiles, "_base.html")
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if err != nil {
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log.Printf("Could not read base template: %s", err)
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return nil, err
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}
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t.Parse(string(file))
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file, err = blob.GetFile(blob.TemplateFiles, name+".html")
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if err != nil {
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log.Printf("Could not read %s template: %s", name, err)
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return nil, err
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}
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t.Parse(string(file))
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return t, nil
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}
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func getTemplate(name string) (t *template.Template, err error) {
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if *useLocalAssets {
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t, err = getLocalTemplate(name)
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} else {
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t, err = getEmbeddedTemplate(name)
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}
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if err != nil {
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return
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}
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if *userAssetsPath != "" {
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// replace "user_dashboard_link" template
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t.Parse(`{{define "user_dashboard_link"}}<a href="/user">User Dashboard{{end}}`)
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}
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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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log.Printf("Error preparing layout template: %s", 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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log.Printf("Error executing template: %s", err)
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}
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}
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