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// Copyright 2015 The etcd Authors
//
// 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 raft
import (
"fmt"
"io/ioutil"
"log"
"os"
)
type Logger interface {
Debug(v ...interface{})
Debugf(format string, v ...interface{})
Error(v ...interface{})
Errorf(format string, v ...interface{})
Info(v ...interface{})
Infof(format string, v ...interface{})
Warning(v ...interface{})
Warningf(format string, v ...interface{})
Fatal(v ...interface{})
Fatalf(format string, v ...interface{})
Panic(v ...interface{})
Panicf(format string, v ...interface{})
}
func SetLogger(l Logger) { raftLogger = l }
var (
defaultLogger = &DefaultLogger{Logger: log.New(os.Stderr, "raft", log.LstdFlags)}
discardLogger = &DefaultLogger{Logger: log.New(ioutil.Discard, "", 0)}
raftLogger = Logger(defaultLogger)
)
const (
calldepth = 2
)
// DefaultLogger is a default implementation of the Logger interface.
type DefaultLogger struct {
*log.Logger
debug bool
}
func (l *DefaultLogger) EnableTimestamps() {
l.SetFlags(l.Flags() | log.Ldate | log.Ltime)
}
func (l *DefaultLogger) EnableDebug() {
l.debug = true
}
func (l *DefaultLogger) Debug(v ...interface{}) {
if l.debug {
l.Output(calldepth, header("DEBUG", fmt.Sprint(v...)))
}
}
func (l *DefaultLogger) Debugf(format string, v ...interface{}) {
if l.debug {
l.Output(calldepth, header("DEBUG", fmt.Sprintf(format, v...)))
}
}
func (l *DefaultLogger) Info(v ...interface{}) {
l.Output(calldepth, header("INFO", fmt.Sprint(v...)))
}
func (l *DefaultLogger) Infof(format string, v ...interface{}) {
l.Output(calldepth, header("INFO", fmt.Sprintf(format, v...)))
}
func (l *DefaultLogger) Error(v ...interface{}) {
l.Output(calldepth, header("ERROR", fmt.Sprint(v...)))
}
func (l *DefaultLogger) Errorf(format string, v ...interface{}) {
l.Output(calldepth, header("ERROR", fmt.Sprintf(format, v...)))
}
func (l *DefaultLogger) Warning(v ...interface{}) {
l.Output(calldepth, header("WARN", fmt.Sprint(v...)))
}
func (l *DefaultLogger) Warningf(format string, v ...interface{}) {
l.Output(calldepth, header("WARN", fmt.Sprintf(format, v...)))
}
func (l *DefaultLogger) Fatal(v ...interface{}) {
l.Output(calldepth, header("FATAL", fmt.Sprint(v...)))
os.Exit(1)
}
func (l *DefaultLogger) Fatalf(format string, v ...interface{}) {
l.Output(calldepth, header("FATAL", fmt.Sprintf(format, v...)))
os.Exit(1)
}
func (l *DefaultLogger) Panic(v ...interface{}) {
l.Logger.Panic(v)
}
func (l *DefaultLogger) Panicf(format string, v ...interface{}) {
l.Logger.Panicf(format, v...)
}
func header(lvl, msg string) string {
return fmt.Sprintf("%s: %s", lvl, msg)
}
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