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