1package log
2
3import (
4	"bytes"
5	"fmt"
6
7	log "github.com/sirupsen/logrus"
8)
9
10func forNil(v interface{}, otherwise interface{}) interface{} {
11	if v == nil {
12		return otherwise
13	}
14
15	return v
16}
17
18// combinedAccessLogFormatter formats logs into a format similar to the combined access log format
19// See https://httpd.apache.org/docs/1.3/logs.html#combined
20type combinedAccessLogFormatter struct {
21	clock clock
22}
23
24// Format renders a single log entry.
25func (f *combinedAccessLogFormatter) Format(entry *log.Entry) ([]byte, error) {
26	host := forNil(entry.Data[httpHostField], "-")
27	remoteAddr := forNil(entry.Data[httpRemoteIPField], "")
28	method := forNil(entry.Data[httpRequestMethodField], "")
29	uri := forNil(entry.Data[httpURIField], "")
30	proto := forNil(entry.Data[httpProtoField], "")
31	status := forNil(entry.Data[httpResponseStatusCodeField], 0)
32	written := forNil(entry.Data[httpResponseSizeField], 0)
33	referer := forNil(entry.Data[httpRequestReferrerField], "")
34	userAgent := forNil(entry.Data[httpUserAgentField], "")
35	duration := forNil(entry.Data[requestDurationField], 0)
36
37	now := f.clock.Now().Format("2006/01/02:15:04:05 -0700")
38
39	requestLine := fmt.Sprintf("%s %s %s", method, uri, proto)
40
41	buf := &bytes.Buffer{}
42	_, err := fmt.Fprintf(buf, "%s %s - - [%s] %q %d %d %q %q %d\n",
43		host, remoteAddr, now, requestLine,
44		status, written, referer, userAgent, duration,
45	)
46
47	return buf.Bytes(), err
48}
49
50// newCombinedcombinedAccessLogFormatter returns a new formatter for combined access logs.
51func newCombinedcombinedAccessLogFormatter() log.Formatter {
52	return &combinedAccessLogFormatter{clock: &realClock{}}
53}
54