meditime/vendor/github.com/dgraph-io/badger/logger.go

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/*
* Copyright 2018 Dgraph Labs, Inc. and Contributors
*
* 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 badger
import (
"log"
"os"
)
// Logger is implemented by any logging system that is used for standard logs.
type Logger interface {
Errorf(string, ...interface{})
Warningf(string, ...interface{})
Infof(string, ...interface{})
Debugf(string, ...interface{})
}
// Errorf logs an ERROR log message to the logger specified in opts or to the
// global logger if no logger is specified in opts.
func (opt *Options) Errorf(format string, v ...interface{}) {
if opt.Logger == nil {
return
}
opt.Logger.Errorf(format, v...)
}
// Infof logs an INFO message to the logger specified in opts.
func (opt *Options) Infof(format string, v ...interface{}) {
if opt.Logger == nil {
return
}
opt.Logger.Infof(format, v...)
}
// Warningf logs a WARNING message to the logger specified in opts.
func (opt *Options) Warningf(format string, v ...interface{}) {
if opt.Logger == nil {
return
}
opt.Logger.Warningf(format, v...)
}
// Debugf logs a DEBUG message to the logger specified in opts.
func (opt *Options) Debugf(format string, v ...interface{}) {
if opt.Logger == nil {
return
}
opt.Logger.Debugf(format, v...)
}
type defaultLog struct {
*log.Logger
}
var defaultLogger = &defaultLog{Logger: log.New(os.Stderr, "badger ", log.LstdFlags)}
func (l *defaultLog) Errorf(f string, v ...interface{}) {
l.Printf("ERROR: "+f, v...)
}
func (l *defaultLog) Warningf(f string, v ...interface{}) {
l.Printf("WARNING: "+f, v...)
}
func (l *defaultLog) Infof(f string, v ...interface{}) {
l.Printf("INFO: "+f, v...)
}
func (l *defaultLog) Debugf(f string, v ...interface{}) {
l.Printf("DEBUG: "+f, v...)
}