Go之Logrus用法入门

Logrus是Go (golang)的结构化日志程序，完全兼容标准库的API日志程序。
Logrus is a structured logger for Go (golang), completely API compatible with the standard library logger.

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文章目录:

• Logrus自带两种formatter
  • TextFormatter
  • JsonFormatter
  • 自定义Formatter
• Logrus基本用法
• 自定义Log
  • 包结构
  • formatter.go
  • log.go
  • main.go
• 参考资料

代码仓库：https://github.com/qo0/go-logrus-document

注意：基本用法请跳转Logrus

---

1 Logrus自带两种formatter

1.1 TextFormatter

下面展示几个常用的字段
type TextFormatter struct {
DisableColors bool // 开启颜色显示

DisableTimestamp bool // 开启时间显示

TimestampFormat string // 自定义时间格式

QuoteEmptyFields bool //空字段括在引号中

CallerPrettyfier func(*runtime.Frame) (function string, file string) //用于自定义方法名和文件名的输出
}

1.2 JsonFormatter

下面展示几个常用的字段
type JSONFormatter struct {
TimestampFormat string // 自定义时间格式

DisableTimestamp bool // 开启时间显示

CallerPrettyfier func(*runtime.Frame) (function string, file string) //用于自定义方法名和文件名的输出

PrettyPrint bool //将缩进所有json日志
}

1.3 第三种 自定义Formatter

只需要实现该接口
type Formatter interface {
Format(*Entry) ([]byte, error)
}

其中entry参数
type Entry struct {
// Contains all the fields set by the user.
Data Fields

// Time at which the log entry was created
Time time.Time

// Level the log entry was logged at: Trace, Debug, Info, Warn, Error, Fatal or Panic
Level Level

//Calling method, with package name
Caller *runtime.Frame

//Message passed to Trace, Debug, Info, Warn, Error, Fatal or Panic
Message string

//When formatter is called in entry.log(), a Buffer may be set to entry
Buffer *bytes.Buffer
}

2 Logrus基本用法

func Demo(log *logrus.Logger) {
log.Info("i'm demo")

}

func main() {
log := logrus.New()
log.SetReportCaller(true)
log.SetFormatter(&logrus.JSONFormatter{
TimestampFormat: "2006-01-02 15:03:04", //自定义日期格式
CallerPrettyfier: func(frame *runtime.Frame) (function string, file string) { //自定义Caller的返回
//处理文件名
fileName := path.Base(frame.File)
return frame.Function, fileName
},
})
Demo(log)
}

3 自定义Log

3.1 包结构

Test
- log
- formatter
- formatter.go
- log.go
- main.go

3.2 formatter.go

package formatter

import (
"bytes"
"fmt"
"path"

logrus "github.com/sirupsen/logrus"
)
//颜色
const (
red = 31
yellow = 33
blue = 36
gray = 37
)

type LogFormatter struct{}

//实现Formatter(entry *logrus.Entry) ([]byte, error)接口
func (t *LogFormatter) Format(entry *logrus.Entry) ([]byte, error) {
//根据不同的level去展示颜色
var levelColor int
switch entry.Level {
case logrus.DebugLevel, logrus.TraceLevel:
levelColor = gray
case logrus.WarnLevel:
levelColor = yellow
case logrus.ErrorLevel, logrus.FatalLevel, logrus.PanicLevel:
levelColor = red
default:
levelColor = blue
}
var b *bytes.Buffer
if entry.Buffer != nil {
b = entry.Buffer
} else {
b = &bytes.Buffer{}
}
//自定义日期格式
timestamp := entry.Time.Format("2006-01-02 15:04:05")
if entry.HasCaller() {
//自定义文件路径
funcVal := entry.Caller.Function
fileVal := fmt.Sprintf("%s:%d", path.Base(entry.Caller.File), entry.Caller.Line)
//自定义输出格式
fmt.Fprintf(b, "[%s] \x1b[%dm[%s]\x1b[0m %s %s %s\n", timestamp, levelColor, entry.Level, fileVal, funcVal, entry.Message)
} else {
fmt.Fprintf(b, "[%s] \x1b[%dm[%s]\x1b[0m %s\n", timestamp, levelColor, entry.Level, entry.Message)
}
return b.Bytes(), nil
}

3.3 log.go

package Log

import (
"os"

. "./formatter"

"github.com/sirupsen/logrus"
)

var Logger = NewLog()

type Log struct {
log *logrus.Logger
}

func NewLog() *Log {
mLog := logrus.New() //新建一个实例
mLog.SetOutput(os.Stderr) //设置输出类型
mLog.SetReportCaller(true) //开启返回函数名和行号
mLog.SetFormatter(&LogFormatter{}) //设置自己定义的Formatter
mLog.SetLevel(logrus.DebugLevel) //设置最低的Level
return &Log{
log: mLog,
}
}
//封装一些会用到的方法
func (l *Log) Debug(args ...interface{}) {
l.log.Debugln(args...)
}
func (l *Log) Debugf(format string, args ...interface{}) {
l.log.Debugf(format, args...)
}
func (l *Log) Info(args ...interface{}) {
l.log.Infoln(args...)
}
func (l *Log) Infof(format string, args ...interface{}) {
l.log.Infof(format, args...)
}
func (l *Log) Error(args ...interface{}) {
l.log.Errorln(args...)
}
func (l *Log) Errorf(format string, args ...interface{}) {
l.log.Errorf(format, args...)
}
func (l *Log) Trace(args ...interface{}) {
l.log.Traceln()
}
func (l *Log) Tracef(format string, args ...interface{}) {
l.log.Tracef(format, args...)
}
func (l *Log) Panic(args ...interface{}) {
l.log.Panicln()
}
func (l *Log) Panicf(format string, args ...interface{}) {
l.log.Panicf(format, args...)
}

func (l *Log) Print(args ...interface{}) {
l.log.Println()
}
func (l *Log) Printf(format string, args ...interface{}) {
l.log.Printf(format, args...)
}

3.4 main.go

package main

import (
. "./log"
)

func Demo() {
Logger.Info("i'm demo")

}

func main() {
Demo()
}

//输出，其中[info]为蓝色
[2022-01-21 10:10:47] [info] entry.go:359 github.com/sirupsen/logrus.(*Entry).Logln i'm demo

4 参考资料

logrus: https://github.com/sirupsen/logrus

logrus自定义日志输出格式: https://blog.csdn.net/qmhball/article/details/

logrus中输出文件名、行号及函数名: https://blog.csdn.net/qmhball/article/details/

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