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logger.go
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logger.go
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package main
import (
"fmt"
"net/http"
"time"
)
//LoggingHandler wraps the handler with logger
func LoggingHandler(handler http.Handler) http.Handler {
return loggingHandler{handler}
}
type loggingHandler struct {
handler http.Handler
}
func (l loggingHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
start := time.Now()
writer := &responseWriter{w, 0, 0}
l.handler.ServeHTTP(writer, r)
end := time.Now()
latency := end.Sub(start)
fmt.Printf("%s [%v] \"%s %s %s\" %d %d \"%s\" %v\n",
r.RemoteAddr, end.Format(time.RFC1123Z),
r.Method, r.URL.Path, r.Proto,
writer.status, writer.size, r.Header.Get("User-Agent"), latency)
}
type responseWriter struct {
W http.ResponseWriter
status int
size int
}
func (w *responseWriter) Header() http.Header {
return w.W.Header()
}
func (w *responseWriter) Write(data []byte) (int, error) {
if w.status == 0 {
w.status = http.StatusOK
}
size, err := w.W.Write(data)
w.size += size
return size, err
}
func (w *responseWriter) WriteHeader(header int) {
w.W.WriteHeader(header)
w.status = header
}