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json_formatter.go
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json_formatter.go
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package logging
import (
"time"
"github.com/sirupsen/logrus"
)
// jsonFormatter is like the standard logrus JSONFormatter, except that it outputs timestamps in
// Unix timestamps with millisecond precision.
type jsonFormatter struct {
formatter *logrus.JSONFormatter
}
var _ logrus.Formatter = &jsonFormatter{}
func newJSONFormatter() *jsonFormatter {
return &jsonFormatter{
&logrus.JSONFormatter{
DisableTimestamp: true,
FieldMap: logrus.FieldMap{
logrus.FieldKeyTime: "@timestamp",
logrus.FieldKeyLevel: "@level",
},
},
}
}
// Format the fields to match our common ElasticSearch formats and index
func (j *jsonFormatter) Format(e *logrus.Entry) ([]byte, error) {
e.Data["time"] = e.Time.UnixNano() / int64(time.Millisecond)
e.Data["level"] = intLevel(e.Level)
return j.formatter.Format(e)
}
func intLevel(lvl logrus.Level) uint {
switch lvl {
case logrus.TraceLevel:
return 0
case logrus.DebugLevel:
return 10
case logrus.InfoLevel:
return 20
case logrus.WarnLevel:
return 30
case logrus.ErrorLevel:
return 40
default:
// should only be fatal
return 50
}
}