-
Notifications
You must be signed in to change notification settings - Fork 0
/
server.go
98 lines (86 loc) · 2.18 KB
/
server.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
package main
import (
"encoding/json"
"fmt"
"github.com/gorilla/mux"
"github.com/writeas/impart"
"github.com/writeas/web-core/log"
"io/ioutil"
"net/http"
"runtime/debug"
"time"
)
const (
countsFilename = "counts.json"
)
// Initialize and start web server
func Serve() error {
// Set up routes
r := mux.NewRouter()
initRoutes(r)
// Load counts
data, err := ioutil.ReadFile(countsFilename)
if err != nil {
log.Info("failed to ReadFile: %s", err)
log.Info("All counts starting from 0")
} else {
err = json.Unmarshal(data, &counts)
if err != nil {
log.Error("failed to Unmarshal %s: %s", countsFilename, err)
log.Error("All counts starting from 0")
}
}
// Start server
serve := fmt.Sprintf("%s:%d", "", 6767)
log.Info("Serving on %s", serve)
err = http.ListenAndServe(serve, r)
return err
}
func SaveCounts() error {
b, err := json.Marshal(counts)
if err != nil {
return fmt.Errorf("unable to marshal counts: %s", err)
}
err = ioutil.WriteFile(countsFilename, b, 0666)
if err != nil {
return fmt.Errorf("counts not saved: %s", err)
}
return nil
}
func initRoutes(r *mux.Router) {
r.HandleFunc("/hits", handleHandler(handleViewHits))
r.HandleFunc("/hit", handleHandler(handleView))
r.HandleFunc("/hit.gif", handleHandler(handlePixel))
r.HandleFunc("/", handleHandler(handleHome))
}
type handlerFunc func(w http.ResponseWriter, r *http.Request) error
func handleHandler(f handlerFunc) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
var status int
start := time.Now()
defer func() {
if e := recover(); e != nil {
log.Error("%s: %s", e, debug.Stack())
status = http.StatusInternalServerError
}
log.Info("\"%s %s\" %d %s \"%s\"", r.Method, r.RequestURI, status, time.Since(start), r.UserAgent())
}()
err := f(w, r)
if err != nil {
if err, ok := err.(impart.HTTPError); ok {
status = err.Status
if status >= 300 && status < 400 {
w.Header().Set("Location", err.Message)
}
w.WriteHeader(status)
if status == http.StatusNotFound && err.Message != "" {
fmt.Fprintf(w, err.Message)
}
} else {
status = http.StatusInternalServerError
}
} else {
status = http.StatusOK
}
}
}