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drampull Added TRACE level logging. 4981d81 Oct 18, 2018
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@didip @vincentbernat @bobtfish @sirupsen @yawn @GJRTimmer @dmathieu
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// +build !windows,!nacl,!plan9
package syslog
import (
// SyslogHook to send logs via syslog.
type SyslogHook struct {
Writer *syslog.Writer
SyslogNetwork string
SyslogRaddr string
// Creates a hook to be added to an instance of logger. This is called with
// `hook, err := NewSyslogHook("udp", "localhost:514", syslog.LOG_DEBUG, "")`
// `if err == nil { log.Hooks.Add(hook) }`
func NewSyslogHook(network, raddr string, priority syslog.Priority, tag string) (*SyslogHook, error) {
w, err := syslog.Dial(network, raddr, priority, tag)
return &SyslogHook{w, network, raddr}, err
func (hook *SyslogHook) Fire(entry *logrus.Entry) error {
line, err := entry.String()
if err != nil {
fmt.Fprintf(os.Stderr, "Unable to read entry, %v", err)
return err
switch entry.Level {
case logrus.PanicLevel:
return hook.Writer.Crit(line)
case logrus.FatalLevel:
return hook.Writer.Crit(line)
case logrus.ErrorLevel:
return hook.Writer.Err(line)
case logrus.WarnLevel:
return hook.Writer.Warning(line)
case logrus.InfoLevel:
return hook.Writer.Info(line)
case logrus.DebugLevel, logrus.TraceLevel:
return hook.Writer.Debug(line)
return nil
func (hook *SyslogHook) Levels() []logrus.Level {
return logrus.AllLevels
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