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console.go
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console.go
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/*
* Minio Cloud Storage, (C) 2015 Minio, Inc.
*
* 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 main
import (
"fmt"
"os"
"sync"
"path/filepath"
)
type logLevel int
const (
levelPrint logLevel = iota + 1
levelDebug
levelInfo
levelError
levelFatal
)
var (
mutex = &sync.RWMutex{}
// Fatal prints a error message and exits
Fatal = func(a ...interface{}) { privatePrint(levelFatal, a...) }
// Fatalln prints a error message with a new line and exits
Fatalln = func(a ...interface{}) { privatePrintln(levelFatal, a...) }
// Fatalf prints a error message with formatting and exits
Fatalf = func(f string, a ...interface{}) { privatePrintf(levelFatal, f, a...) }
// Error prints a error message
Error = func(a ...interface{}) { privatePrint(levelError, a...) }
// Errorln prints a error message with a new line
Errorln = func(a ...interface{}) { privatePrintln(levelError, a...) }
// Errorf prints a error message with formatting
Errorf = func(f string, a ...interface{}) { privatePrintf(levelError, f, a...) }
// Info prints a informational message
Info = func(a ...interface{}) { privatePrint(levelInfo, a...) }
// Infoln prints a informational message with a new line
Infoln = func(a ...interface{}) { privatePrintln(levelInfo, a...) }
// Infof prints a informational message with formatting
Infof = func(f string, a ...interface{}) { privatePrintf(levelInfo, f, a...) }
// Debug prints a debug message
Debug = func(a ...interface{}) { privatePrint(levelDebug, a...) }
// Debugln prints a debug message with a new line
Debugln = func(a ...interface{}) { privatePrintln(levelDebug, a...) }
// Debugf prints a debug message with formatting
Debugf = func(f string, a ...interface{}) { privatePrintf(levelDebug, f, a...) }
// Print prints a debug message
Print = func(a ...interface{}) { privatePrint(levelPrint, a...) }
// Println prints a debug message with a new line
Println = func(a ...interface{}) { privatePrintln(levelPrint, a...) }
// Printf prints a debug message with formatting
Printf = func(f string, a ...interface{}) { privatePrintf(levelPrint, f, a...) }
)
var (
// print prints a message prefixed with message type and program name
privatePrint = func(l logLevel, a ...interface{}) {
switch l {
case levelDebug:
mutex.Lock()
fmt.Fprint(os.Stderr, ProgramName()+": <DEBUG> ")
fmt.Fprint(os.Stderr, a...)
mutex.Unlock()
case levelInfo:
mutex.Lock()
fmt.Print(ProgramName() + ": <INFO> ")
fmt.Print(a...)
mutex.Unlock()
case levelError:
mutex.Lock()
fmt.Fprint(os.Stderr, ProgramName()+": <ERROR> ")
fmt.Fprint(os.Stderr, a...)
mutex.Unlock()
case levelFatal:
mutex.Lock()
fmt.Fprint(os.Stderr, ProgramName()+": <FATAL> ")
fmt.Fprint(os.Stderr, a...)
mutex.Unlock()
os.Exit(1)
default:
fmt.Print(a...)
}
}
// println - same as print with a new line
privatePrintln = func(l logLevel, a ...interface{}) {
switch l {
case levelDebug:
mutex.Lock()
fmt.Fprint(os.Stderr, ProgramName()+": <DEBUG> ")
fmt.Fprintln(os.Stderr, a...)
mutex.Unlock()
case levelInfo:
mutex.Lock()
fmt.Print(ProgramName() + ": <INFO> ")
fmt.Println(a...)
mutex.Unlock()
case levelError:
mutex.Lock()
fmt.Fprint(os.Stderr, ProgramName()+": <ERROR> ")
fmt.Fprintln(os.Stderr, a...)
mutex.Unlock()
case levelFatal:
mutex.Lock()
fmt.Fprint(os.Stderr, ProgramName()+": <FATAL> ")
fmt.Fprintln(os.Stderr, a...)
mutex.Unlock()
os.Exit(1)
default:
fmt.Println(a...)
}
}
// printf - same as print, but takes a format specifier
privatePrintf = func(l logLevel, f string, a ...interface{}) {
switch l {
case levelDebug:
mutex.Lock()
fmt.Fprint(os.Stderr, ProgramName()+": <DEBUG> ")
fmt.Fprintf(os.Stderr, f, a...)
mutex.Unlock()
case levelInfo:
mutex.Lock()
fmt.Print(ProgramName() + ": <INFO> ")
fmt.Printf(f, a...)
mutex.Unlock()
case levelError:
mutex.Lock()
fmt.Fprint(os.Stderr, ProgramName()+": <ERROR> ")
fmt.Fprintf(os.Stderr, f, a...)
mutex.Unlock()
case levelFatal:
mutex.Lock()
fmt.Fprint(os.Stderr, ProgramName()+": <FATAL> ")
fmt.Fprintf(os.Stderr, f, a...)
mutex.Unlock()
os.Exit(1)
default:
fmt.Printf(f, a...)
}
}
)
// ProgramName - return the name of the executable program
func ProgramName() string {
_, progName := filepath.Split(os.Args[0])
return progName
}