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 }
  21
  22 // WriteHeader writes header to ResponseWriter
  23 func (loggingWriter *LoggingResponseWriter) WriteHeader(code int) {
  24         loggingWriter.Status = code
  25         loggingWriter.ResponseWriter.WriteHeader(code)
  26 }
  27
  28 func (loggingWriter *LoggingResponseWriter) Write(data []byte) (int, error) {
  29         loggingWriter.Length += len(data)
  30         if loggingWriter.Status >= 400 {
  31                 loggingWriter.ResponseBody += string(data)
  32         }
  33         return loggingWriter.ResponseWriter.Write(data)
  34 }
  35
  36 // LoggingRESTRouter is used to add logging capabilities to mux.Router
  37 type LoggingRESTRouter struct {
  38         router *mux.Router
  39 }
  40
  41 // MakeLoggingRESTRouter initializes LoggingRESTRouter
  42 func MakeLoggingRESTRouter() *LoggingRESTRouter {
  43         router := MakeRESTRouter()
  44         return (&LoggingRESTRouter{router})
  45 }
  46
  47 func (loggingRouter *LoggingRESTRouter) ServeHTTP(resp http.ResponseWriter, req *http.Request) {
  48         t0 := time.Now()
  49         loggingWriter := LoggingResponseWriter{http.StatusOK, 0, resp, ""}
  50         loggingRouter.router.ServeHTTP(&loggingWriter, req)
  51         statusText := http.StatusText(loggingWriter.Status)
  52         if loggingWriter.Status >= 400 {
  53                 statusText = strings.Replace(loggingWriter.ResponseBody, "\n", "", -1)
  54         }
  55         log.Printf("[%s] %s %s %.6fs %d %d \"%s\"", req.RemoteAddr, req.Method, req.URL.Path[1:], time.Since(t0).Seconds(), loggingWriter.Status, loggingWriter.Length, statusText)
  56
  57 }