forked from ha/doozerd
/
web.go
137 lines (120 loc) · 2.7 KB
/
web.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
package web
import (
"code.google.com/p/go.net/websocket"
"encoding/json"
"github.com/ha/doozerd/store"
"io"
"log"
"net"
"net/http"
"runtime"
"strings"
"text/template"
)
var Store *store.Store
var ClusterName string
var (
mainTpl = template.Must(template.New("main.html").Parse(main_html))
statsTpl = template.Must(template.New("stats.html").Parse(stats_html))
)
type info struct {
Name string
Path string
}
type stringHandler struct {
contentType string
body string
}
func (sh stringHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
w.Header().Set("content-type", sh.contentType)
io.WriteString(w, sh.body)
}
func Serve(listener net.Listener) {
http.HandleFunc("/", viewHtml)
http.HandleFunc("/$stats.html", statsHtml)
http.Handle("/$main.js", stringHandler{"application/javascript", main_js})
http.Handle("/$main.css", stringHandler{"text/css", main_css})
http.HandleFunc("/$events/", evServer)
http.Serve(listener, nil)
}
func send(ws *websocket.Conn, path string, evs <-chan store.Event) {
l := len(path) - 1
for ev := range evs {
ev.Getter = nil // don't marshal the entire snapshot
ev.Path = ev.Path[l:]
b, err := json.Marshal(ev)
if err != nil {
log.Println(err)
return
}
_, err = ws.Write(b)
if err != nil {
log.Println(err)
return
}
}
}
func evServer(w http.ResponseWriter, r *http.Request) {
wevs := make(chan store.Event)
path := r.URL.Path[len("/$events"):]
glob, err := store.CompileGlob(path + "**")
if err != nil {
w.WriteHeader(400)
return
}
rev, _ := Store.Snap()
go func() {
walk(path, Store, wevs)
for {
ch, err := Store.Wait(glob, rev+1)
if err != nil {
break
}
ev, ok := <-ch
if !ok {
break
}
wevs <- ev
rev = ev.Seqn
}
close(wevs)
}()
websocket.Handler(func(ws *websocket.Conn) {
send(ws, path, wevs)
ws.Close()
}).ServeHTTP(w, r)
}
func viewHtml(w http.ResponseWriter, r *http.Request) {
if !strings.HasSuffix(r.URL.Path, "/") {
w.WriteHeader(404)
return
}
var x info
x.Name = ClusterName
x.Path = r.URL.Path
w.Header().Set("content-type", "text/html")
mainTpl.Execute(w, x)
}
func statsHtml(w http.ResponseWriter, r *http.Request) {
w.Header().Set("content-type", "text/html")
memstats := new(runtime.MemStats)
runtime.ReadMemStats(memstats)
statsTpl.Execute(w, *memstats)
}
func walk(path string, st *store.Store, ch chan store.Event) {
for path != "/" && strings.HasSuffix(path, "/") {
// TODO generalize and factor this into pkg store.
path = path[0 : len(path)-1]
}
v, rev := st.Get(path)
if rev != store.Dir {
ch <- store.Event{0, path, v[0], rev, "", nil, nil}
return
}
if path == "/" {
path = ""
}
for _, ent := range v {
walk(path+"/"+ent, st, ch)
}
}