-
Notifications
You must be signed in to change notification settings - Fork 225
/
reporter.go
59 lines (49 loc) · 1.57 KB
/
reporter.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
package handlers
import (
"net/http"
"time"
"code.cloudfoundry.org/gorouter/metrics"
"code.cloudfoundry.org/gorouter/proxy/utils"
"code.cloudfoundry.org/gorouter/logger"
"github.com/uber-go/zap"
"github.com/urfave/negroni/v3"
)
type reporterHandler struct {
reporter metrics.ProxyReporter
logger logger.Logger
}
// NewReporter creates a new handler that handles reporting backend
// responses to metrics and missing Content-Length header
func NewReporter(reporter metrics.ProxyReporter, logger logger.Logger) negroni.Handler {
return &reporterHandler{
reporter: reporter,
logger: logger,
}
}
// ServeHTTP handles reporting the response after the request has been completed
func (rh *reporterHandler) ServeHTTP(rw http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
logger := LoggerWithTraceInfo(rh.logger, r)
requestInfo, err := ContextRequestInfo(r)
// logger.Panic does not cause gorouter to exit 1 but rather throw panic with
// stacktrace in error log
if err != nil {
logger.Panic("request-info-err", zap.Error(err))
return
}
if r.Header.Get("Content-Length") == "" {
rh.reporter.CaptureMissingContentLengthHeader()
}
next(rw, r)
if requestInfo.RouteEndpoint == nil {
return
}
proxyWriter := rw.(utils.ProxyResponseWriter)
rh.reporter.CaptureRoutingResponse(proxyWriter.Status())
if requestInfo.AppRequestFinishedAt.Equal(time.Time{}) {
return
}
rh.reporter.CaptureRoutingResponseLatency(
requestInfo.RouteEndpoint, proxyWriter.Status(),
requestInfo.ReceivedAt, requestInfo.AppRequestFinishedAt.Sub(requestInfo.ReceivedAt),
)
}