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
|
package main
import (
"fmt"
"log"
"net/http"
)
const addr = ":9090"
type humidityHandler struct {
humidity Record[float32]
}
func newHumidityHandler() humidityHandler {
return humidityHandler{newRecord[float32]()}
}
func (h *humidityHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
switch r.Method {
case http.MethodGet:
h.get(w, r)
case http.MethodPost:
h.post(w, r)
default:
w.WriteHeader(http.StatusMethodNotAllowed)
fmt.Fprintf(w, "invalid method: '%s'", r.Method)
}
}
func (h *humidityHandler) get(w http.ResponseWriter, r *http.Request) {
c := make(chan float32)
h.humidity.getRecent <- c
humidity, ok := <-c
if !ok {
w.WriteHeader(http.StatusGone)
fmt.Fprintf(w, "no humidity data stored on server")
return
}
fmt.Fprintf(w, "%f", humidity)
}
func (h *humidityHandler) post(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusNotImplemented)
}
func main() {
http.Handle("/humidity", new(humidityHandler))
fmt.Printf("Listening on %s...\n", addr)
log.Fatal(http.ListenAndServe(addr, nil))
}
|