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log.go
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log.go
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//
// Copyright (c) 2015 The heketi 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 utils
import (
"fmt"
"github.com/lpabon/godbc"
"io"
"log"
"os"
"runtime"
)
type LogLevel int
const (
LEVEL_NOLOG LogLevel = iota
LEVEL_CRITICAL
LEVEL_ERROR
LEVEL_WARNING
LEVEL_INFO
LEVEL_DEBUG
)
var (
stderr io.Writer = os.Stderr
stdout io.Writer = os.Stdout
)
type Logger struct {
critlog, errorlog, infolog *log.Logger
debuglog, warninglog *log.Logger
level LogLevel
}
func NewLogger(prefix string, level LogLevel) *Logger {
godbc.Require(level >= 0, level)
godbc.Require(level <= LEVEL_DEBUG, level)
l := &Logger{}
if level == LEVEL_NOLOG {
l.level = LEVEL_DEBUG
} else {
l.level = level
}
l.critlog = log.New(stderr, prefix+" CRITICAL ", log.LstdFlags)
l.errorlog = log.New(stderr, prefix+" ERROR ", log.LstdFlags)
l.warninglog = log.New(stdout, prefix+" WARNING ", log.LstdFlags)
l.infolog = log.New(stdout, prefix+" INFO ", log.LstdFlags)
l.debuglog = log.New(stdout, prefix+" DEBUG ", log.LstdFlags)
godbc.Ensure(l.critlog != nil)
godbc.Ensure(l.errorlog != nil)
godbc.Ensure(l.warninglog != nil)
godbc.Ensure(l.infolog != nil)
godbc.Ensure(l.debuglog != nil)
return l
}
func (l *Logger) Level() LogLevel {
return l.level
}
func (l *Logger) SetLevel(level LogLevel) {
l.level = level
}
func logWithLonfile(l *log.Logger, format string, v ...interface{}) {
_, file, line, _ := runtime.Caller(2)
l.Print(fmt.Sprintf("%v:%v: ", file, line) +
fmt.Sprintf(format, v...))
}
func (l *Logger) Critical(format string, v ...interface{}) {
if l.level >= LEVEL_CRITICAL {
logWithLonfile(l.critlog, format, v...)
}
}
func (l *Logger) LogError(format string, v ...interface{}) {
if l.level >= LEVEL_ERROR {
logWithLonfile(l.errorlog, format, v...)
}
}
func (l *Logger) Err(err error) {
if l.level >= LEVEL_ERROR {
logWithLonfile(l.errorlog, "%v", err)
}
}
func (l *Logger) Warning(format string, v ...interface{}) {
if l.level >= LEVEL_WARNING {
l.warninglog.Printf(format, v...)
}
}
func (l *Logger) Info(format string, v ...interface{}) {
if l.level >= LEVEL_INFO {
l.infolog.Printf(format, v...)
}
}
func (l *Logger) Debug(format string, v ...interface{}) {
if l.level >= LEVEL_DEBUG {
logWithLonfile(l.debuglog, format, v...)
}
}