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Apache access logs for golang.
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| import ( | |
| "fmt" | |
| "io" | |
| "net/http" | |
| "strings" | |
| "time" | |
| ) | |
| // https://httpd.apache.org/docs/2.2/logs.html#combined + execution time. | |
| const apacheFormatPattern = "%s - - [%s] \"%s %s %s\" %d %d \"%s\" \"%s\" %.4f\n" | |
| type ApacheLogRecord struct { | |
| http.ResponseWriter | |
| ip string | |
| time time.Time | |
| method, uri, protocol string | |
| status int | |
| responseBytes int64 | |
| referer string | |
| userAgent string | |
| elapsedTime time.Duration | |
| } | |
| func (r *ApacheLogRecord) Log(out io.Writer) { | |
| timeFormatted := r.time.Format("02/Jan/2006 03:04:05") | |
| fmt.Fprintf(out, apacheFormatPattern, r.ip, timeFormatted, r.method, | |
| r.uri, r.protocol, r.status, r.responseBytes, r.referer, r.userAgent, | |
| r.elapsedTime.Seconds()) | |
| } | |
| func (r *ApacheLogRecord) Write(p []byte) (int, error) { | |
| written, err := r.ResponseWriter.Write(p) | |
| r.responseBytes += int64(written) | |
| return written, err | |
| } | |
| func (r *ApacheLogRecord) WriteHeader(status int) { | |
| r.status = status | |
| r.ResponseWriter.WriteHeader(status) | |
| } | |
| type ApacheLoggingHandler struct { | |
| handler http.Handler | |
| out io.Writer | |
| } | |
| func NewApacheLoggingHandler(handler http.Handler, out io.Writer) http.Handler { | |
| return &ApacheLoggingHandler{ | |
| handler: handler, | |
| out: out, | |
| } | |
| } | |
| func (h *ApacheLoggingHandler) ServeHTTP(rw http.ResponseWriter, r *http.Request) { | |
| clientIP := r.RemoteAddr | |
| if colon := strings.LastIndex(clientIP, ":"); colon != -1 { | |
| clientIP = clientIP[:colon] | |
| } | |
| referer := r.Referer() | |
| if referer == "" { | |
| referer = "-" | |
| } | |
| userAgent := r.UserAgent() | |
| if userAgent == "" { | |
| userAgent = "-" | |
| } | |
| record := &ApacheLogRecord{ | |
| ResponseWriter: rw, | |
| ip: clientIP, | |
| time: time.Time{}, | |
| method: r.Method, | |
| uri: r.RequestURI, | |
| protocol: r.Proto, | |
| status: http.StatusOK, | |
| referer: referer, | |
| userAgent: userAgent, | |
| elapsedTime: time.Duration(0), | |
| } | |
| startTime := time.Now() | |
| h.handler.ServeHTTP(record, r) | |
| finishTime := time.Now() | |
| record.time = finishTime.UTC() | |
| record.elapsedTime = finishTime.Sub(startTime) | |
| record.Log(h.out) | |
| } |
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| func main() { | |
| mux := http.DefaultServeMux | |
| mux.HandleFunc("/", indexHandler) | |
| loggingHandler := NewApacheLoggingHandler(mux, os.Stderr) | |
| server := &http.Server{ | |
| Addr: ":8000", | |
| Handler: loggingHandler, | |
| } | |
| server.ListenAndServe() | |
| } |
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why does it show undefined index handler?
do we need to define it explicitly ?