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// Copyright 2015 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build !windows,!nacl,!plan9
package log
import (
"fmt"
"log/syslog"
"os"
"github.com/Sirupsen/logrus"
)
var _ logrus.Formatter = (*syslogger)(nil)
func init() {
setSyslogFormatter = func(appname, local string) error {
if appname == "" {
return fmt.Errorf("missing appname parameter")
}
if local == "" {
return fmt.Errorf("missing local parameter")
}
fmter, err := newSyslogger(appname, local, origLogger.Formatter)
if err != nil {
fmt.Fprintf(os.Stderr, "error creating syslog formatter: %v\n", err)
origLogger.Errorf("can't connect logger to syslog: %v", err)
return err
}
origLogger.Formatter = fmter
return nil
}
}
var prefixTag []byte
type syslogger struct {
wrap logrus.Formatter
out *syslog.Writer
}
func newSyslogger(appname string, facility string, fmter logrus.Formatter) (*syslogger, error) {
priority, err := getFacility(facility)
if err != nil {
return nil, err
}
out, err := syslog.New(priority, appname)
_, isJSON := fmter.(*logrus.JSONFormatter)
if isJSON {
// add cee tag to json formatted syslogs
prefixTag = []byte("@cee:")
}
return &syslogger{
out: out,
wrap: fmter,
}, err
}
func getFacility(facility string) (syslog.Priority, error) {
switch facility {
case "0":
return syslog.LOG_LOCAL0, nil
case "1":
return syslog.LOG_LOCAL1, nil
case "2":
return syslog.LOG_LOCAL2, nil
case "3":
return syslog.LOG_LOCAL3, nil
case "4":
return syslog.LOG_LOCAL4, nil
case "5":
return syslog.LOG_LOCAL5, nil
case "6":
return syslog.LOG_LOCAL6, nil
case "7":
return syslog.LOG_LOCAL7, nil
}
return syslog.LOG_LOCAL0, fmt.Errorf("invalid local(%s) for syslog", facility)
}
func (s *syslogger) Format(e *logrus.Entry) ([]byte, error) {
data, err := s.wrap.Format(e)
if err != nil {
fmt.Fprintf(os.Stderr, "syslogger: can't format entry: %v\n", err)
return data, err
}
// only append tag to data sent to syslog (line), not to what
// is returned
line := string(append(prefixTag, data...))
switch e.Level {
case logrus.PanicLevel:
err = s.out.Crit(line)
case logrus.FatalLevel:
err = s.out.Crit(line)
case logrus.ErrorLevel:
err = s.out.Err(line)
case logrus.WarnLevel:
err = s.out.Warning(line)
case logrus.InfoLevel:
err = s.out.Info(line)
case logrus.DebugLevel:
err = s.out.Debug(line)
default:
err = s.out.Notice(line)
}
if err != nil {
fmt.Fprintf(os.Stderr, "syslogger: can't send log to syslog: %v\n", err)
}
return data, err
}
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