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// Gulu - Golang common utilities for everyone.
// Copyright (c) 2019-present, b3log.org
//
// LianDi is licensed under Mulan PSL v2.
// You can use this software according to the terms and conditions of the Mulan PSL v2.
// You may obtain a copy of Mulan PSL v2 at:
// http://license.coscl.org.cn/MulanPSL2
// THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
// See the Mulan PSL v2 for more details.
package gulu
import (
"fmt"
"io"
stdlog "log"
"os"
"strings"
)
type guluLog struct{}
// Log utilities.
var Log = guluLog{}
// Logging level.
const (
Off = iota
Trace
Debug
Info
Warn
Error
Fatal
)
// all loggers.
var loggers []*Logger
// the global default logging level, it will be used for creating logger.
var logLevel = Debug
// Logger represents a simple logger with level.
// The underlying logger is the standard Go logging "log".
type Logger struct {
level int
logger *stdlog.Logger
}
// NewLogger creates a logger.
func (*guluLog) NewLogger(out io.Writer) *Logger {
ret := &Logger{level: logLevel, logger: stdlog.New(out, "", stdlog.Ldate|stdlog.Ltime|stdlog.Lshortfile)}
loggers = append(loggers, ret)
return ret
}
// SetLevel sets the logging level of all loggers.
func (*guluLog) SetLevel(level string) {
logLevel = getLevel(level)
for _, l := range loggers {
l.SetLevel(level)
}
}
// getLevel gets logging level int value corresponding to the specified level.
func getLevel(level string) int {
level = strings.ToLower(level)
switch level {
case "off":
return Off
case "trace":
return Trace
case "debug":
return Debug
case "info":
return Info
case "warn":
return Warn
case "error":
return Error
case "fatal":
return Fatal
default:
return Info
}
}
// SetLevel sets the logging level of a logger.
func (l *Logger) SetLevel(level string) {
l.level = getLevel(level)
}
// IsTraceEnabled determines whether the trace level is enabled.
func (l *Logger) IsTraceEnabled() bool {
return l.level <= Trace
}
// IsDebugEnabled determines whether the debug level is enabled.
func (l *Logger) IsDebugEnabled() bool {
return l.level <= Debug
}
// IsWarnEnabled determines whether the debug level is enabled.
func (l *Logger) IsWarnEnabled() bool {
return l.level <= Warn
}
// Trace prints trace level message.
func (l *Logger) Trace(v ...interface{}) {
if Trace < l.level {
return
}
l.logger.SetPrefix("T ")
l.logger.Output(2, fmt.Sprintln(v...))
}
// Tracef prints trace level message with format.
func (l *Logger) Tracef(format string, v ...interface{}) {
if Trace < l.level {
return
}
l.logger.SetPrefix("T ")
l.logger.Output(2, fmt.Sprintf(format, v...))
}
// Debug prints debug level message.
func (l *Logger) Debug(v ...interface{}) {
if Debug < l.level {
return
}
l.logger.SetPrefix("D ")
l.logger.Output(2, fmt.Sprintln(v...))
}
// Debugf prints debug level message with format.
func (l *Logger) Debugf(format string, v ...interface{}) {
if Debug < l.level {
return
}
l.logger.SetPrefix("D ")
l.logger.Output(2, fmt.Sprintf(format, v...))
}
// Info prints info level message.
func (l *Logger) Info(v ...interface{}) {
if Info < l.level {
return
}
l.logger.SetPrefix("I ")
l.logger.Output(2, fmt.Sprintln(v...))
}
// Infof prints info level message with format.
func (l *Logger) Infof(format string, v ...interface{}) {
if Info < l.level {
return
}
l.logger.SetPrefix("I ")
l.logger.Output(2, fmt.Sprintf(format, v...))
}
// Warn prints warning level message.
func (l *Logger) Warn(v ...interface{}) {
if Warn < l.level {
return
}
l.logger.SetPrefix("W ")
l.logger.Output(2, fmt.Sprintln(v...))
}
// Warnf prints warning level message with format.
func (l *Logger) Warnf(format string, v ...interface{}) {
if Warn < l.level {
return
}
l.logger.SetPrefix("W ")
l.logger.Output(2, fmt.Sprintf(format, v...))
}
// Error prints error level message.
func (l *Logger) Error(v ...interface{}) {
if Error < l.level {
return
}
l.logger.SetPrefix("E ")
l.logger.Output(2, fmt.Sprintln(v...))
}
// Errorf prints error level message with format.
func (l *Logger) Errorf(format string, v ...interface{}) {
if Error < l.level {
return
}
l.logger.SetPrefix("E ")
l.logger.Output(2, fmt.Sprintf(format, v...))
}
// Fatal prints fatal level message and exit process with code 1.
func (l *Logger) Fatal(v ...interface{}) {
if Fatal < l.level {
return
}
l.logger.SetPrefix("F ")
l.logger.Output(2, fmt.Sprintln(v...))
os.Exit(1)
}
// Fatalf prints fatal level message with format and exit process with code 1.
func (l *Logger) Fatalf(format string, v ...interface{}) {
if Fatal < l.level {
return
}
l.logger.SetPrefix("F ")
l.logger.Output(2, fmt.Sprintf(format, v...))
os.Exit(1)
}
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