| /* |
| * 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 loggingLevel int |
| |
| const ( |
| DEBUG loggingLevel = iota |
| INFO |
| WARNING |
| ERROR |
| ) |
| |
| type defaultLog struct { |
| *log.Logger |
| level loggingLevel |
| } |
| |
| func defaultLogger(level loggingLevel) *defaultLog { |
| return &defaultLog{Logger: log.New(os.Stderr, "badger ", log.LstdFlags), level: level} |
| } |
| |
| func (l *defaultLog) Errorf(f string, v ...interface{}) { |
| if l.level <= ERROR { |
| l.Printf("ERROR: "+f, v...) |
| } |
| } |
| |
| func (l *defaultLog) Warningf(f string, v ...interface{}) { |
| if l.level <= WARNING { |
| l.Printf("WARNING: "+f, v...) |
| } |
| } |
| |
| func (l *defaultLog) Infof(f string, v ...interface{}) { |
| if l.level <= INFO { |
| l.Printf("INFO: "+f, v...) |
| } |
| } |
| |
| func (l *defaultLog) Debugf(f string, v ...interface{}) { |
| if l.level <= DEBUG { |
| l.Printf("DEBUG: "+f, v...) |
| } |
| } |
