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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2017-2019 WireGuard LLC. All Rights Reserved.
*/
package device
import (
"io"
"io/ioutil"
"log"
"os"
)
const (
LogLevelSilent = iota
LogLevelError
LogLevelInfo
LogLevelDebug
)
type Logger struct {
Debug *log.Logger
Info *log.Logger
Error *log.Logger
}
func NewLogger(level int, prepend string) *Logger {
output := os.Stdout
logger := new(Logger)
logErr, logInfo, logDebug := func() (io.Writer, io.Writer, io.Writer) {
if level >= LogLevelDebug {
return output, output, output
}
if level >= LogLevelInfo {
return output, output, ioutil.Discard
}
if level >= LogLevelError {
return output, ioutil.Discard, ioutil.Discard
}
return ioutil.Discard, ioutil.Discard, ioutil.Discard
}()
logger.Debug = log.New(logDebug,
"DEBUG: "+prepend,
log.Ldate|log.Ltime,
)
logger.Info = log.New(logInfo,
"INFO: "+prepend,
log.Ldate|log.Ltime,
)
logger.Error = log.New(logErr,
"ERROR: "+prepend,
log.Ldate|log.Ltime,
)
return logger
}
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