1// Copyright 2018 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
15package ctrlz
16
17import (
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/pkg/ctrlz/assets"
29	"istio.io/pkg/ctrlz/fw"
30)
31
32var 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
40type homeInfo struct {
41	ProcessName string
42	HeapSize    uint64
43	NumGC       uint32
44	CurrentTime int64
45	Hostname    string
46	IP          string
47}
48
49func 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
65func registerHome(router *mux.Router, layout *template.Template) {
66	homeTmpl := template.Must(template.Must(layout.Clone()).Parse(string(assets.MustAsset("templates/home.html"))))
67	errorTmpl := template.Must(template.Must(layout.Clone()).Parse(string(assets.MustAsset("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.Asset("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}
96