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logrus_gelf_formatter.go
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/
logrus_gelf_formatter.go
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package logger
import (
"fmt"
"os"
"sync"
"github.com/mdouchement/logger/syslog"
"github.com/sirupsen/logrus"
)
// A LogrusGELFFormatter is GELF formatter for Logrus.
type LogrusGELFFormatter struct {
sync.Once
Hostname string
}
func (f *LogrusGELFFormatter) init() {
var err error
if f.Hostname == "" {
f.Hostname, err = os.Hostname()
if err != nil {
f.Hostname = "localhost"
}
}
}
// Format implements logrus.Formatter.
func (f *LogrusGELFFormatter) Format(entry *logrus.Entry) ([]byte, error) {
f.Do(f.init)
gelf := NewBufferGELF()
for k, v := range entry.Data {
if k == KeyPrefix {
entry.Message = fmt.Sprintf("%s %s", v, entry.Message)
continue
}
gelf.Add(k, v)
}
gelf.Host(f.Hostname)
gelf.Timestamp(entry.Time)
gelf.Level(f.priorities(entry.Level))
gelf.Message(entry.Message)
gelf.Add("level_name", entry.Level.String())
if entry.Caller != nil {
gelf.Add("file", entry.Caller.File)
}
return gelf.Complete(true), nil
}
func (f *LogrusGELFFormatter) priorities(level logrus.Level) int32 {
var p syslog.Priority
switch level {
case logrus.PanicLevel:
p = syslog.LOG_ALERT
case logrus.FatalLevel:
p = syslog.LOG_CRIT
case logrus.ErrorLevel:
p = syslog.LOG_ERR
case logrus.WarnLevel:
p = syslog.LOG_WARNING
case logrus.InfoLevel:
p = syslog.LOG_INFO
case logrus.DebugLevel:
p = syslog.LOG_DEBUG
}
return int32(p)
}