/
logger.go
78 lines (69 loc) · 1.47 KB
/
logger.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
package middleware
import (
"fmt"
"net/http"
"strings"
"time"
"github.com/ncarlier/webhookd/pkg/logger"
)
type key int
const (
requestIDKey key = 0
)
// Logger is a middleware to log HTTP request
func Logger(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
o := &responseObserver{ResponseWriter: w}
start := time.Now()
defer func() {
requestID, ok := r.Context().Value(requestIDKey).(string)
if !ok {
requestID = "0"
}
addr := r.RemoteAddr
if i := strings.LastIndex(addr, ":"); i != -1 {
addr = addr[:i]
}
logger.Info.Printf(
"%s - - [%s] %q %d %d %q %q %q",
addr,
start.Format("02/Jan/2006:15:04:05 -0700"),
fmt.Sprintf("%s %s %s", r.Method, r.URL, r.Proto),
o.status,
o.written,
r.Referer(),
r.UserAgent(),
fmt.Sprintf("REQID=%s", requestID),
)
}()
next.ServeHTTP(o, r)
})
}
type responseObserver struct {
http.ResponseWriter
status int
written int64
wroteHeader bool
}
func (o *responseObserver) Write(p []byte) (n int, err error) {
if !o.wroteHeader {
o.WriteHeader(http.StatusOK)
}
n, err = o.ResponseWriter.Write(p)
o.written += int64(n)
return
}
func (o *responseObserver) WriteHeader(code int) {
o.ResponseWriter.WriteHeader(code)
if o.wroteHeader {
return
}
o.wroteHeader = true
o.status = code
}
func (o *responseObserver) Flush() {
flusher, ok := o.ResponseWriter.(http.Flusher)
if ok {
flusher.Flush()
}
}