/
log.go
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/
log.go
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// Copyright 2015 Google 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 provides a universal logger for martian packages.
package log
import (
"fmt"
"log"
"sync"
)
const (
// Silent is a level that logs nothing.
Silent int = iota
// Error is a level that logs error logs.
Error
// Info is a level that logs error, and info logs.
Info
// Debug is a level that logs error, info, and debug logs.
Debug
)
// Default log level is Error.
var (
level = Error
lock sync.Mutex
)
// SetLevel sets the global log level.
func SetLevel(l int) {
lock.Lock()
defer lock.Unlock()
level = l
}
// Infof logs an info message.
func Infof(format string, args ...interface{}) {
lock.Lock()
defer lock.Unlock()
if level < Info {
return
}
msg := fmt.Sprintf("INFO: %s", format)
if len(args) > 0 {
msg = fmt.Sprintf(msg, args...)
}
log.Println(msg)
}
// Debugf logs a debug message.
func Debugf(format string, args ...interface{}) {
lock.Lock()
defer lock.Unlock()
if level < Debug {
return
}
msg := fmt.Sprintf("DEBUG: %s", format)
if len(args) > 0 {
msg = fmt.Sprintf(msg, args...)
}
log.Println(msg)
}
// Errorf logs an error message.
func Errorf(format string, args ...interface{}) {
lock.Lock()
defer lock.Unlock()
if level < Error {
return
}
msg := fmt.Sprintf("ERROR: %s", format)
if len(args) > 0 {
msg = fmt.Sprintf(msg, args...)
}
log.Println(msg)
}