istio.io/istio@v0.0.0-20240520182934-d79c90f27776/pkg/ctrlz/home.go (about)

     1  // Copyright Istio Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package ctrlz
    16  
    17  import (
    18  	"html/template"
    19  	"net/http"
    20  	"os"
    21  	"path/filepath"
    22  	"runtime"
    23  	"strings"
    24  	"time"
    25  
    26  	"github.com/gorilla/mux"
    27  
    28  	"istio.io/istio/pkg/ctrlz/assets"
    29  	"istio.io/istio/pkg/ctrlz/fw"
    30  )
    31  
    32  var mimeTypes = map[string]string{
    33  	".css": "text/css; charset=utf-8",
    34  	".svg": "image/svg+xml; charset=utf-8",
    35  	".ico": "image/x-icon",
    36  	".png": "image/png",
    37  	".js":  "application/javascript",
    38  }
    39  
    40  type homeInfo struct {
    41  	ProcessName string
    42  	HeapSize    uint64
    43  	NumGC       uint32
    44  	CurrentTime int64
    45  	Hostname    string
    46  	IP          string
    47  }
    48  
    49  func getHomeInfo() *homeInfo {
    50  	var ms runtime.MemStats
    51  	runtime.ReadMemStats(&ms)
    52  
    53  	hostName, _ := os.Hostname()
    54  
    55  	return &homeInfo{
    56  		ProcessName: os.Args[0],
    57  		HeapSize:    ms.HeapAlloc,
    58  		NumGC:       ms.NumGC,
    59  		CurrentTime: time.Now().UnixNano(),
    60  		Hostname:    hostName,
    61  		IP:          getLocalIP(),
    62  	}
    63  }
    64  
    65  func registerHome(router *mux.Router, layout *template.Template) {
    66  	homeTmpl := assets.ParseTemplate(template.Must(layout.Clone()), "templates/home.html")
    67  	errorTmpl := assets.ParseTemplate(template.Must(layout.Clone()), "templates/404.html")
    68  
    69  	_ = router.NewRoute().PathPrefix("/").Methods("GET").HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
    70  		if req.URL.Path == "/" {
    71  			// home page
    72  			fw.RenderHTML(w, homeTmpl, getHomeInfo())
    73  		} else if req.URL.Path == "/homej" || req.URL.Path == "/homej/" {
    74  			fw.RenderJSON(w, http.StatusOK, getHomeInfo())
    75  		} else if a, err := assets.FS.ReadFile("static" + req.URL.Path); err == nil {
    76  			// static asset
    77  			ext := strings.ToLower(filepath.Ext(req.URL.Path))
    78  			if mime, ok := mimeTypes[ext]; ok {
    79  				w.Header().Set("Content-Type", mime)
    80  			}
    81  			_, _ = w.Write(a)
    82  		} else {
    83  			// 'not found' page
    84  			w.WriteHeader(http.StatusNotFound)
    85  			fw.RenderHTML(w, errorTmpl, nil)
    86  		}
    87  	})
    88  
    89  	_ = router.NewRoute().Methods("PUT").Path("/homej/exit").HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
    90  		w.WriteHeader(http.StatusAccepted)
    91  		time.AfterFunc(1*time.Second, func() {
    92  			os.Exit(0)
    93  		})
    94  	})
    95  }