138 lines
3.9 KiB
Go
138 lines
3.9 KiB
Go
// Copyright 2015 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 ui
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import (
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"fmt"
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"io"
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"net/http"
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_ "net/http/pprof" // Comment this line to disable pprof endpoint.
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"path"
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"github.com/go-kit/log"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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"github.com/prometheus/common/route"
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"github.com/prometheus/common/server"
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"github.com/prometheus/alertmanager/asset"
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reactApp "github.com/prometheus/alertmanager/ui/react-app"
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)
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var reactRouterPaths = []string{
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"/",
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"/status",
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}
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// Register registers handlers to serve files for the web interface.
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func Register(r *route.Router, reloadCh chan<- chan error, logger log.Logger) {
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r.Get("/metrics", promhttp.Handler().ServeHTTP)
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r.Get("/", func(w http.ResponseWriter, req *http.Request) {
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disableCaching(w)
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req.URL.Path = "/static/"
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fs := http.FileServer(asset.Assets)
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fs.ServeHTTP(w, req)
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})
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r.Get("/script.js", func(w http.ResponseWriter, req *http.Request) {
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disableCaching(w)
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req.URL.Path = "/static/script.js"
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fs := http.FileServer(asset.Assets)
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fs.ServeHTTP(w, req)
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})
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r.Get("/favicon.ico", func(w http.ResponseWriter, req *http.Request) {
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disableCaching(w)
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req.URL.Path = "/static/favicon.ico"
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fs := http.FileServer(asset.Assets)
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fs.ServeHTTP(w, req)
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})
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r.Get("/lib/*path", func(w http.ResponseWriter, req *http.Request) {
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disableCaching(w)
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req.URL.Path = path.Join("/static/lib", route.Param(req.Context(), "path"))
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fs := http.FileServer(asset.Assets)
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fs.ServeHTTP(w, req)
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})
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serveReactApp := func(w http.ResponseWriter, r *http.Request) {
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f, err := reactApp.Assets.Open("/dist/index.html")
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if err != nil {
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w.WriteHeader(http.StatusInternalServerError)
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fmt.Fprintf(w, "Error opening React index.html: %v", err)
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return
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}
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defer func() { _ = f.Close() }()
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idx, err := io.ReadAll(f)
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if err != nil {
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w.WriteHeader(http.StatusInternalServerError)
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fmt.Fprintf(w, "Error reading React index.html: %v", err)
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return
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}
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w.Write(idx)
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}
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// Static files required by the React app.
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r.Get("/react-app/*filepath", func(w http.ResponseWriter, r *http.Request) {
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for _, rt := range reactRouterPaths {
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if r.URL.Path != "/react-app"+rt {
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continue
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}
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serveReactApp(w, r)
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return
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}
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r.URL.Path = path.Join("/dist", route.Param(r.Context(), "filepath"))
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fs := server.StaticFileServer(reactApp.Assets)
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fs.ServeHTTP(w, r)
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})
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r.Post("/-/reload", func(w http.ResponseWriter, req *http.Request) {
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errc := make(chan error)
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defer close(errc)
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reloadCh <- errc
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if err := <-errc; err != nil {
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http.Error(w, fmt.Sprintf("failed to reload config: %s", err), http.StatusInternalServerError)
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}
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})
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r.Get("/-/healthy", func(w http.ResponseWriter, _ *http.Request) {
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w.WriteHeader(http.StatusOK)
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fmt.Fprintf(w, "OK")
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})
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r.Head("/-/healthy", func(w http.ResponseWriter, _ *http.Request) {
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w.WriteHeader(http.StatusOK)
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})
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r.Get("/-/ready", func(w http.ResponseWriter, _ *http.Request) {
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w.WriteHeader(http.StatusOK)
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fmt.Fprintf(w, "OK")
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})
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r.Head("/-/ready", func(w http.ResponseWriter, _ *http.Request) {
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w.WriteHeader(http.StatusOK)
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})
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r.Get("/debug/*subpath", http.DefaultServeMux.ServeHTTP)
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r.Post("/debug/*subpath", http.DefaultServeMux.ServeHTTP)
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}
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func disableCaching(w http.ResponseWriter) {
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w.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
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w.Header().Set("Pragma", "no-cache")
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w.Header().Set("Expires", "0") // Prevent proxies from caching.
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}
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