traefik/middlewares/accesslog/logger_formatters.go

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package accesslog
import (
"bytes"
"fmt"
"time"
"github.com/Sirupsen/logrus"
)
// default format for time presentation
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const (
commonLogTimeFormat = "02/Jan/2006:15:04:05 -0700"
defaultValue = "-"
)
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// CommonLogFormatter provides formatting in the Traefik common log format
type CommonLogFormatter struct{}
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//Format formats the log entry in the Traefik common log format
func (f *CommonLogFormatter) Format(entry *logrus.Entry) ([]byte, error) {
b := &bytes.Buffer{}
timestamp := entry.Data[StartUTC].(time.Time).Format(commonLogTimeFormat)
elapsedMillis := entry.Data[Duration].(time.Duration).Nanoseconds() / 1000000
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_, err := fmt.Fprintf(b, "%s - %s [%s] \"%s %s %s\" %v %v %s %s %v %s %s %dms\n",
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entry.Data[ClientHost],
entry.Data[ClientUsername],
timestamp,
entry.Data[RequestMethod],
entry.Data[RequestPath],
entry.Data[RequestProtocol],
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toLog(entry.Data[OriginStatus]),
toLog(entry.Data[OriginContentSize]),
toLog(entry.Data["request_Referer"]),
toLog(entry.Data["request_User-Agent"]),
toLog(entry.Data[RequestCount]),
toLog(entry.Data[FrontendName]),
toLog(entry.Data[BackendURL]),
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elapsedMillis)
return b.Bytes(), err
}
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func toLog(v interface{}) interface{} {
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if v == nil {
return defaultValue
}
switch s := v.(type) {
case string:
return quoted(s, defaultValue)
case fmt.Stringer:
return quoted(s.String(), defaultValue)
default:
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return v
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}
}
func quoted(s string, defaultValue string) string {
if len(s) == 0 {
return defaultValue
}
return `"` + s + `"`
}