istio

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// Copyright Istio Authors
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//
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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 ctrlz
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import (
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	"html/template"
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	"net/http"
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	"os"
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	"path/filepath"
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	"runtime"
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	"strings"
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	"time"
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	"github.com/gorilla/mux"
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	"istio.io/istio/pkg/ctrlz/assets"
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	"istio.io/istio/pkg/ctrlz/fw"
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)
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var mimeTypes = map[string]string{
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	".css": "text/css; charset=utf-8",
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	".svg": "image/svg+xml; charset=utf-8",
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	".ico": "image/x-icon",
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	".png": "image/png",
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	".js":  "application/javascript",
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}
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type homeInfo struct {
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	ProcessName string
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	HeapSize    uint64
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	NumGC       uint32
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	CurrentTime int64
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	Hostname    string
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	IP          string
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}
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func getHomeInfo() *homeInfo {
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	var ms runtime.MemStats
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	runtime.ReadMemStats(&ms)
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	hostName, _ := os.Hostname()
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	return &homeInfo{
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		ProcessName: os.Args[0],
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		HeapSize:    ms.HeapAlloc,
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		NumGC:       ms.NumGC,
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		CurrentTime: time.Now().UnixNano(),
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		Hostname:    hostName,
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		IP:          getLocalIP(),
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	}
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}
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func registerHome(router *mux.Router, layout *template.Template) {
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	homeTmpl := assets.ParseTemplate(template.Must(layout.Clone()), "templates/home.html")
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	errorTmpl := assets.ParseTemplate(template.Must(layout.Clone()), "templates/404.html")
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	_ = router.NewRoute().PathPrefix("/").Methods("GET").HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
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		if req.URL.Path == "/" {
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			// home page
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			fw.RenderHTML(w, homeTmpl, getHomeInfo())
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		} else if req.URL.Path == "/homej" || req.URL.Path == "/homej/" {
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			fw.RenderJSON(w, http.StatusOK, getHomeInfo())
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		} else if a, err := assets.FS.ReadFile("static" + req.URL.Path); err == nil {
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			// static asset
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			ext := strings.ToLower(filepath.Ext(req.URL.Path))
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			if mime, ok := mimeTypes[ext]; ok {
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				w.Header().Set("Content-Type", mime)
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			}
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			_, _ = w.Write(a)
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		} else {
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			// 'not found' page
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			w.WriteHeader(http.StatusNotFound)
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			fw.RenderHTML(w, errorTmpl, nil)
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		}
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	})
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	_ = router.NewRoute().Methods("PUT").Path("/homej/exit").HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
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		w.WriteHeader(http.StatusAccepted)
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		time.AfterFunc(1*time.Second, func() {
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			os.Exit(0)
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		})
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	})
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}
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