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logger.go
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logger.go
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package adapter
import (
"net/http"
"time"
"github.com/sirupsen/logrus"
)
type loggingResponseWriter interface {
http.ResponseWriter
http.Flusher
Status() int
Size() int
}
// responseLogger is wrapper of http.ResponseWriter that keeps track of its HTTP
// status code and body size
//
// steel from https://github.com/gorilla/handlers/blob/master/handlers.go
type responseLogger struct {
w http.ResponseWriter
status int
size int
}
func (l *responseLogger) Header() http.Header {
return l.w.Header()
}
func (l *responseLogger) Write(b []byte) (int, error) {
if l.status == 0 {
// The status will be StatusOK if WriteHeader has not been called yet
l.status = http.StatusOK
}
size, err := l.w.Write(b)
l.size += size
return size, err
}
func (l *responseLogger) WriteHeader(s int) {
l.w.WriteHeader(s)
l.status = s
}
func (l *responseLogger) Status() int {
return l.status
}
func (l *responseLogger) Size() int {
return l.size
}
func (l *responseLogger) Flush() {
f, ok := l.w.(http.Flusher)
if ok {
f.Flush()
}
}
type closeNotifyWriter struct {
loggingResponseWriter
http.CloseNotifier
}
func makeLogger(w http.ResponseWriter) loggingResponseWriter {
var logger loggingResponseWriter = &responseLogger{w: w}
if c, ok := w.(http.CloseNotifier); ok {
return &closeNotifyWriter{logger, c}
}
return logger
}
type loggingHandler struct {
handler http.Handler
}
func (h loggingHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
start := time.Now()
logger := makeLogger(w)
url := *req.URL
h.handler.ServeHTTP(logger, req)
fields := logrus.Fields{
"uri": url.String(),
"status": logger.Status(),
"size": logger.Size(),
"method": req.Method,
"user": logger.Header().Get("x-ngx-omniauth-user"),
"provider": logger.Header().Get("x-ngx-omniauth-provider"),
"original_uri": req.Header.Get("x-ngx-omniauth-original-uri"),
}
end := time.Now()
fields["reqtime_microsec"] = end.Sub(start).Nanoseconds() / 1000
logrus.WithFields(fields).Info("access log")
}
// LoggingHandler logs HTTP requests.
func LoggingHandler(h http.Handler) http.Handler {
return loggingHandler{h}
}