services/keepstore/logging_router.go

   1 package main
   2
   3 // LoggingRESTRouter
   4 // LoggingResponseWriter
   5
   6 import (
   7         "github.com/gorilla/mux"
   8         "log"
   9         "net/http"
  10         "strings"
  11         "time"
  12 )
  13
  14 // LoggingResponseWriter has anonymous fields ResponseWriter and ResponseBody
  15 type LoggingResponseWriter struct {
  16         Status int
  17         Length int
  18         http.ResponseWriter
  19         ResponseBody string
  20         sentHdr      time.Time
  21 }
  22
  23 // WriteHeader writes header to ResponseWriter
  24 func (loggingWriter *LoggingResponseWriter) WriteHeader(code int) {
  25         if loggingWriter.sentHdr == zeroTime {
  26                 loggingWriter.sentHdr = time.Now()
  27         }
  28         loggingWriter.Status = code
  29         loggingWriter.ResponseWriter.WriteHeader(code)
  30 }
  31
  32 var zeroTime time.Time
  33
  34 func (loggingWriter *LoggingResponseWriter) Write(data []byte) (int, error) {
  35         if loggingWriter.Length == 0 && len(data) > 0 && loggingWriter.sentHdr == zeroTime {
  36                 loggingWriter.sentHdr = time.Now()
  37         }
  38         loggingWriter.Length += len(data)
  39         if loggingWriter.Status >= 400 {
  40                 loggingWriter.ResponseBody += string(data)
  41         }
  42         return loggingWriter.ResponseWriter.Write(data)
  43 }
  44
  45 // LoggingRESTRouter is used to add logging capabilities to mux.Router
  46 type LoggingRESTRouter struct {
  47         router *mux.Router
  48 }
  49
  50 // MakeLoggingRESTRouter initializes LoggingRESTRouter
  51 func MakeLoggingRESTRouter() *LoggingRESTRouter {
  52         router := MakeRESTRouter()
  53         return (&LoggingRESTRouter{router})
  54 }
  55
  56 func (loggingRouter *LoggingRESTRouter) ServeHTTP(resp http.ResponseWriter, req *http.Request) {
  57         t0 := time.Now()
  58         loggingWriter := LoggingResponseWriter{http.StatusOK, 0, resp, "", zeroTime}
  59         loggingRouter.router.ServeHTTP(&loggingWriter, req)
  60         statusText := http.StatusText(loggingWriter.Status)
  61         if loggingWriter.Status >= 400 {
  62                 statusText = strings.Replace(loggingWriter.ResponseBody, "\n", "", -1)
  63         }
  64         now := time.Now()
  65         tTotal := now.Sub(t0)
  66         tLatency := loggingWriter.sentHdr.Sub(t0)
  67         tResponse := now.Sub(loggingWriter.sentHdr)
  68         log.Printf("[%s] %s %s %d %.6fs %.6fs %.6fs %d %d \"%s\"", req.RemoteAddr, req.Method, req.URL.Path[1:], req.ContentLength, tTotal.Seconds(), tLatency.Seconds(), tResponse.Seconds(), loggingWriter.Status, loggingWriter.Length, statusText)
  69
  70 }