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log.go
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log.go
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// Copyright 2016-2017 VMware, Inc. All Rights Reserved.
//
// 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 log
import (
"sync"
"github.com/Sirupsen/logrus"
"github.com/vmware/vic/pkg/log/syslog"
)
type LoggingConfig struct {
Formatter logrus.Formatter
Level logrus.Level
Syslog *SyslogConfig
}
type SyslogConfig struct {
Network string
RAddr string
Tag string
Priority syslog.Priority
}
var initializer struct {
once sync.Once
err error
}
func NewLoggingConfig() *LoggingConfig {
return &LoggingConfig{
Formatter: NewTextFormatter(),
Level: logrus.InfoLevel,
}
}
func Init(cfg *LoggingConfig) error {
initializer.once.Do(
func() {
var err error
logger := logrus.StandardLogger()
f := logger.Formatter
l := logger.Level
defer func() {
initializer.err = err
if err != nil {
// revert
logrus.SetFormatter(f)
logrus.SetLevel(l)
}
}()
logrus.SetFormatter(cfg.Formatter)
logrus.SetLevel(cfg.Level)
logrus.Debugf("log cfg: %+v", *cfg)
hook, err := CreateSyslogHook(cfg)
if err == nil && hook != nil {
logrus.AddHook(hook)
}
})
return initializer.err
}
func CreateSyslogHook(cfg *LoggingConfig) (logrus.Hook, error) {
if cfg.Syslog == nil {
return nil, nil
}
hook, err := syslog.NewHook(
cfg.Syslog.Network,
cfg.Syslog.RAddr,
cfg.Syslog.Priority,
cfg.Syslog.Tag,
)
if err != nil {
// not a fatal error, so just log a warning
logrus.Warnf("error trying to initialize syslog: %s", err)
}
return hook, err
}