-
Notifications
You must be signed in to change notification settings - Fork 5k
/
field_middleware.go
78 lines (63 loc) · 2.28 KB
/
field_middleware.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 accesslog
import (
"net/http"
"time"
"github.com/rs/zerolog/log"
"github.com/traefik/traefik/v3/pkg/logs"
"github.com/traefik/traefik/v3/pkg/middlewares/capture"
"github.com/vulcand/oxy/v2/utils"
)
// FieldApply function hook to add data in accesslog.
type FieldApply func(rw http.ResponseWriter, r *http.Request, next http.Handler, data *LogData)
// FieldHandler sends a new field to the logger.
type FieldHandler struct {
next http.Handler
name string
value string
applyFn FieldApply
}
// NewFieldHandler creates a Field handler.
func NewFieldHandler(next http.Handler, name, value string, applyFn FieldApply) http.Handler {
return &FieldHandler{next: next, name: name, value: value, applyFn: applyFn}
}
func (f *FieldHandler) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
table := GetLogData(req)
if table == nil {
f.next.ServeHTTP(rw, req)
return
}
table.Core[f.name] = f.value
if f.applyFn != nil {
f.applyFn(rw, req, f.next, table)
} else {
f.next.ServeHTTP(rw, req)
}
}
// AddServiceFields add service fields.
func AddServiceFields(rw http.ResponseWriter, req *http.Request, next http.Handler, data *LogData) {
start := time.Now().UTC()
next.ServeHTTP(rw, req)
// use UTC to handle switchover of daylight saving correctly
data.Core[OriginDuration] = time.Now().UTC().Sub(start)
// make copy of headers, so we can ensure there is no subsequent mutation
// during response processing
data.OriginResponse = make(http.Header)
utils.CopyHeaders(data.OriginResponse, rw.Header())
ctx := req.Context()
capt, err := capture.FromContext(ctx)
if err != nil {
log.Ctx(ctx).Error().Err(err).Str(logs.MiddlewareType, "AccessLogs").Msg("Could not get Capture")
return
}
data.Core[OriginStatus] = capt.StatusCode()
data.Core[OriginContentSize] = capt.ResponseSize()
}
// InitServiceFields init service fields.
func InitServiceFields(rw http.ResponseWriter, req *http.Request, next http.Handler, data *LogData) {
// Because they are expected to be initialized when the logger is processing the data table,
// the origin fields are initialized in case the response is returned by Traefik itself, and not a service.
data.Core[OriginDuration] = time.Duration(0)
data.Core[OriginStatus] = 0
data.Core[OriginContentSize] = int64(0)
next.ServeHTTP(rw, req)
}