traefik/vendor/github.com/vulcand/oxy/utils/logging.go

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2017-02-07 21:33:23 +00:00
package utils
import (
"io"
"log"
)
var NullLogger Logger = &NOPLogger{}
// Logger defines a simple logging interface
type Logger interface {
Infof(format string, args ...interface{})
Warningf(format string, args ...interface{})
Errorf(format string, args ...interface{})
}
type FileLogger struct {
info *log.Logger
warn *log.Logger
error *log.Logger
}
func NewFileLogger(w io.Writer, lvl LogLevel) *FileLogger {
l := &FileLogger{}
flag := log.Ldate | log.Ltime | log.Lmicroseconds
if lvl <= INFO {
l.info = log.New(w, "INFO: ", flag)
}
if lvl <= WARN {
l.warn = log.New(w, "WARN: ", flag)
}
if lvl <= ERROR {
l.error = log.New(w, "ERR: ", flag)
}
return l
}
func (f *FileLogger) Infof(format string, args ...interface{}) {
if f.info == nil {
return
}
f.info.Printf(format, args...)
}
func (f *FileLogger) Warningf(format string, args ...interface{}) {
if f.warn == nil {
return
}
f.warn.Printf(format, args...)
}
func (f *FileLogger) Errorf(format string, args ...interface{}) {
if f.error == nil {
return
}
f.error.Printf(format, args...)
}
type NOPLogger struct {
}
func (*NOPLogger) Infof(format string, args ...interface{}) {
}
func (*NOPLogger) Warningf(format string, args ...interface{}) {
}
func (*NOPLogger) Errorf(format string, args ...interface{}) {
}
func (*NOPLogger) Info(string) {
}
func (*NOPLogger) Warning(string) {
}
func (*NOPLogger) Error(string) {
}
type LogLevel int
const (
INFO = iota
WARN
ERROR
)