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minio/cmd/logger-file-hook.go

83 lines
2.0 KiB

/*
* Minio Cloud Storage, (C) 2015, 2016 Minio, Inc.
*
* 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.
*/
package cmd
import (
"fmt"
"io/ioutil"
"os"
"github.com/Sirupsen/logrus"
)
type fileLogger struct {
Enable bool `json:"enable"`
Filename string `json:"fileName"`
Level string `json:"level"`
}
type localFile struct {
*os.File
}
func enableFileLogger() {
flogger := serverConfig.Logger.GetFile()
if !flogger.Enable || flogger.Filename == "" {
return
}
// Creates the named file with mode 0666, honors system umask.
file, err := os.OpenFile(flogger.Filename, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0666)
fatalIf(err, "Unable to open log file.")
fileLogger := logrus.New()
// Add a local file hook.
fileLogger.Hooks.Add(&localFile{file})
lvl, err := logrus.ParseLevel(flogger.Level)
fatalIf(err, "Unknown log level found in the config file.")
// Set default JSON formatter.
fileLogger.Out = ioutil.Discard
fileLogger.Formatter = new(logrus.JSONFormatter)
fileLogger.Level = lvl // Minimum log level.
log.mu.Lock()
log.loggers = append(log.loggers, fileLogger)
log.mu.Unlock()
}
// Fire fires the file logger hook and logs to the file.
func (l *localFile) Fire(entry *logrus.Entry) error {
line, err := entry.String()
if err != nil {
return fmt.Errorf("Unable to read entry, %v", err)
}
l.File.Write([]byte(line))
l.File.Sync()
return nil
}
// Levels - indicate log levels supported.
func (l *localFile) Levels() []logrus.Level {
return []logrus.Level{
logrus.PanicLevel,
logrus.FatalLevel,
logrus.ErrorLevel,
}
}