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log.go
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log.go
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package log
import (
"io"
"os"
)
// LogLevel how much log to dump
// 0: ALL; 1: INFO; 2: WARN; 3: ERROR; 4: FATAL; 5: OFF
type LogLevel int
const (
AllLevel LogLevel = 0
InfoLevel LogLevel = 1
WarnLevel LogLevel = 2
ErrorLevel LogLevel = 3
FatalLevel LogLevel = 4
OffLevel LogLevel = 5
)
type Logger interface {
Fatal(v ...interface{})
Fatalf(format string, v ...interface{})
Error(v ...interface{})
Errorf(format string, v ...interface{})
Warn(v ...interface{})
Warnf(format string, v ...interface{})
Info(v ...interface{})
Infof(format string, v ...interface{})
Debug(v ...interface{})
Debugf(format string, v ...interface{})
Trace(v ...interface{})
Tracef(format string, v ...interface{})
SetLogLevel(level LogLevel)
SetOutput(io.Writer)
}
var logger Logger = &EmptyLogger{}
type EmptyLogger struct{}
func (l *EmptyLogger) SetLogLevel(LogLevel) {}
func (l *EmptyLogger) Fatal(v ...interface{}) { os.Exit(1) }
func (l *EmptyLogger) Fatalf(format string, v ...interface{}) { os.Exit(1) }
func (l *EmptyLogger) Error(v ...interface{}) {}
func (l *EmptyLogger) Errorf(format string, v ...interface{}) {}
func (l *EmptyLogger) Warn(v ...interface{}) {}
func (l *EmptyLogger) Warnf(format string, v ...interface{}) {}
func (l *EmptyLogger) Info(v ...interface{}) {}
func (l *EmptyLogger) Infof(format string, v ...interface{}) {}
func (l *EmptyLogger) Debug(v ...interface{}) {}
func (l *EmptyLogger) Debugf(format string, v ...interface{}) {}
func (l *EmptyLogger) Trace(v ...interface{}) {}
func (l *EmptyLogger) Tracef(format string, v ...interface{}) {}
func (l *EmptyLogger) SetOutput(w io.Writer) {}
func Error(v ...interface{}) {
logger.Error(v...)
}
func Errorf(format string, v ...interface{}) {
logger.Errorf(format, v...)
}
func Warn(v ...interface{}) {
logger.Warn(v...)
}
func Warnf(format string, v ...interface{}) {
logger.Warnf(format, v...)
}
func Info(v ...interface{}) {
logger.Info(v...)
}
func Infof(format string, v ...interface{}) {
logger.Infof(format, v...)
}
func Debug(v ...interface{}) {
logger.Debug(v...)
}
func Debugf(format string, v ...interface{}) {
logger.Debugf(format, v...)
}
func Trace(v ...interface{}) {
logger.Trace(v...)
}
func Tracef(format string, v ...interface{}) {
logger.Tracef(format, v...)
}
func Fatal(v ...interface{}) {
logger.Fatal(v...)
}
func Fatalf(format string, v ...interface{}) {
logger.Fatalf(format, v...)
}
func SetLogLevel(level LogLevel) {
logger.SetLogLevel(level)
}
func SetOutput(w io.Writer) {
logger.SetOutput(w)
}
func RegisterLogger(l Logger) {
logger = l
}