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
|
package main
import (
"fmt"
"html/template"
"log"
"net/http"
)
const dashboardHtml = `
<!DOCTYPE html>
<html>
<head>
<title>HVAC Dashboard</title>
</head>
<body>
<p>Average humidity: {{ printf "%.1f %%" .Average }}</p>
<table>
<tr><th>Room</th><th>Humidity</th></tr>
{{ range .Rooms }}
<tr><td>{{ .RoomID }}</td><td>{{ printf "%.1f %%" .Humidity }}</td></tr>
{{ end }}
</table>
</body>
</html>`
var dashboard = template.Must(template.New("dashboard").Parse(dashboardHtml))
type Dashboard struct {
Average Humidity
Rooms []Room
}
type Room struct {
RoomID
Humidity
}
type DashboardHandler struct {
Building
}
func (h DashboardHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
log.Println(r.Method, r.URL)
if r.Method != http.MethodGet {
w.WriteHeader(http.StatusMethodNotAllowed)
fmt.Fprintf(w, "invalid method: '%s'", r.Method)
return
}
db := newDashboard(h.Building)
err := dashboard.Execute(w, db)
if err != nil {
log.Println(err)
}
}
func newDashboard(b Building) Dashboard {
average, ok := b.average()
if !ok {
average = -1
}
// TODO: sort by room ID.
rooms := make([]Room, 0, len(b))
for id, record := range b {
c := make(chan Humidity)
record.getRecent <- c
humidity, ok := <-c
if !ok {
humidity = -1
}
rooms = append(rooms, Room{id, humidity})
}
return Dashboard{average, rooms}
}
|