syslogger.go

package logger

import (
	"io/ioutil"
	"log/syslog"

	log "github.com/sirupsen/logrus"
	logrus_syslog "github.com/sirupsen/logrus/hooks/syslog"
)

func initSyslogger(config LogConfig) *log.Logger {
	var logSeverity = map[string]syslog.Priority{
		"LOG_EMERG":   syslog.LOG_EMERG,
		"LOG_ALERT":   syslog.LOG_ALERT,
		"LOG_CRIT":    syslog.LOG_CRIT,
		"LOG_ERR":     syslog.LOG_ERR,
		"LOG_WARNING": syslog.LOG_WARNING,
		"LOG_NOTICE":  syslog.LOG_NOTICE,
		"LOG_INFO":    syslog.LOG_INFO,
		"LOG_DEBUG":   syslog.LOG_DEBUG,
	}
	var logFacility = map[string]syslog.Priority{
		"LOG_KERN":     syslog.LOG_KERN,
		"LOG_USER":     syslog.LOG_USER,
		"LOG_MAIL":     syslog.LOG_MAIL,
		"LOG_DAEMON":   syslog.LOG_DAEMON,
		"LOG_AUTH":     syslog.LOG_AUTH,
		"LOG_SYSLOG":   syslog.LOG_SYSLOG,
		"LOG_LPR":      syslog.LOG_LPR,
		"LOG_NEWS":     syslog.LOG_NEWS,
		"LOG_UUCP":     syslog.LOG_UUCP,
		"LOG_CRON":     syslog.LOG_CRON,
		"LOG_AUTHPRIV": syslog.LOG_AUTHPRIV,
		"LOG_FTP":      syslog.LOG_FTP,

		"LOG_LOCAL0": syslog.LOG_LOCAL0,
		"LOG_LOCAL1": syslog.LOG_LOCAL1,
		"LOG_LOCAL2": syslog.LOG_LOCAL2,
		"LOG_LOCAL3": syslog.LOG_LOCAL3,
		"LOG_LOCAL4": syslog.LOG_LOCAL4,
		"LOG_LOCAL5": syslog.LOG_LOCAL5,
		"LOG_LOCAL6": syslog.LOG_LOCAL6,
		"LOG_LOCAL7": syslog.LOG_LOCAL7,
	}
	logger := log.New()
	hook, err := logrus_syslog.NewSyslogHook(
		config.NetworkType,
		config.Host+":"+config.Port,
		logSeverity[config.Severity]|logFacility[config.Facility],
		config.Title)
	if err != nil {
		log.Errorln(err)
		hook, err = logrus_syslog.NewSyslogHook(
			"", "", logSeverity[config.Severity]|logFacility[config.Facility],
			config.Title)

	} else {
		logger.Hooks.Add(hook)
	}

	logger.Out = ioutil.Discard
	return logger
}