133 lines
2.9 KiB
Go
133 lines
2.9 KiB
Go
// largely adapted from https://github.com/gorilla/handlers/blob/master/handlers.go
|
|
// to add logging of request duration as last value (and drop referrer)
|
|
|
|
package main
|
|
|
|
import (
|
|
"fmt"
|
|
"io"
|
|
"net"
|
|
"net/http"
|
|
"net/url"
|
|
"time"
|
|
)
|
|
|
|
// responseLogger is wrapper of http.ResponseWriter that keeps track of its HTTP status
|
|
// code and body size
|
|
type responseLogger struct {
|
|
w http.ResponseWriter
|
|
status int
|
|
size int
|
|
upstream string
|
|
authInfo string
|
|
}
|
|
|
|
func (l *responseLogger) Header() http.Header {
|
|
return l.w.Header()
|
|
}
|
|
|
|
func (l *responseLogger) ExtractGAPMetadata() {
|
|
upstream := l.w.Header().Get("GAP-Upstream-Address")
|
|
if upstream != "" {
|
|
l.upstream = upstream
|
|
l.w.Header().Del("GAP-Upstream-Address")
|
|
}
|
|
authInfo := l.w.Header().Get("GAP-Auth")
|
|
if authInfo != "" {
|
|
l.authInfo = authInfo
|
|
l.w.Header().Del("GAP-Auth")
|
|
}
|
|
}
|
|
|
|
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
|
|
}
|
|
l.ExtractGAPMetadata()
|
|
size, err := l.w.Write(b)
|
|
l.size += size
|
|
return size, err
|
|
}
|
|
|
|
func (l *responseLogger) WriteHeader(s int) {
|
|
l.ExtractGAPMetadata()
|
|
l.w.WriteHeader(s)
|
|
l.status = s
|
|
}
|
|
|
|
func (l *responseLogger) Status() int {
|
|
return l.status
|
|
}
|
|
|
|
func (l *responseLogger) Size() int {
|
|
return l.size
|
|
}
|
|
|
|
// loggingHandler is the http.Handler implementation for LoggingHandlerTo and its friends
|
|
type loggingHandler struct {
|
|
writer io.Writer
|
|
handler http.Handler
|
|
enabled bool
|
|
}
|
|
|
|
func LoggingHandler(out io.Writer, h http.Handler, v bool) http.Handler {
|
|
return loggingHandler{out, h, v}
|
|
}
|
|
|
|
func (h loggingHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
|
|
t := time.Now()
|
|
url := *req.URL
|
|
logger := &responseLogger{w: w}
|
|
h.handler.ServeHTTP(logger, req)
|
|
if !h.enabled {
|
|
return
|
|
}
|
|
logLine := buildLogLine(logger.authInfo, logger.upstream, req, url, t, logger.Status(), logger.Size())
|
|
h.writer.Write(logLine)
|
|
}
|
|
|
|
// Log entry for req similar to Apache Common Log Format.
|
|
// ts is the timestamp with which the entry should be logged.
|
|
// status, size are used to provide the response HTTP status and size.
|
|
func buildLogLine(username, upstream string, req *http.Request, url url.URL, ts time.Time, status int, size int) []byte {
|
|
if username == "" {
|
|
username = "-"
|
|
}
|
|
if upstream == "" {
|
|
upstream = "-"
|
|
}
|
|
if url.User != nil && username == "-" {
|
|
if name := url.User.Username(); name != "" {
|
|
username = name
|
|
}
|
|
}
|
|
|
|
client := req.Header.Get("X-Real-IP")
|
|
if client == "" {
|
|
client = req.RemoteAddr
|
|
}
|
|
|
|
if c, _, err := net.SplitHostPort(client); err == nil {
|
|
client = c
|
|
}
|
|
|
|
duration := float64(time.Now().Sub(ts)) / float64(time.Second)
|
|
|
|
logLine := fmt.Sprintf("%s - %s [%s] %s %s %s %q %s %q %d %d %0.3f\n",
|
|
client,
|
|
username,
|
|
ts.Format("02/Jan/2006:15:04:05 -0700"),
|
|
req.Host,
|
|
req.Method,
|
|
upstream,
|
|
url.RequestURI(),
|
|
req.Proto,
|
|
req.UserAgent(),
|
|
status,
|
|
size,
|
|
duration,
|
|
)
|
|
return []byte(logLine)
|
|
}
|