Go整合Logrus实现日志打印

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

1 初步使用

package main

import (
   "context"
   "github.com/sirupsen/logrus"
)

func main() {
   method0()
}

func method0() {
   logger:= logrus.New()
   logger.Warning("This is a first log.")
   ctx := context.WithValue(context.Background(),"key","value")
   logger.Warning(ctx,"This is a second log.")
}
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2 增加标签WithFields

package main

import (
   "context"
   "github.com/sirupsen/logrus"
)

func main() {
   method1()
}

func method1() {
   log.WithFields(log.Fields{
      "fieldKey": "fieldValue",
   }).Warning("This is a first field log.")

   log.WithFields(log.Fields{
      "fieldKey": "fieldValue",
      "fieldKey2": "fieldValue2",
   }).Warning("This is a second field log.")
}
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3 配置常见参数

package main

import (
   "context"
   "github.com/sirupsen/logrus"
   log "github.com/sirupsen/logrus"
   "os"
)

func main() {
   method2()
}

func init() {
   // 日志作为JSON而不是默认的ASCII格式器.
   log.SetFormatter(&log.JSONFormatter{})

   // 输出到标准输出,可以是任何io.Writer
   log.SetOutput(os.Stdout)

   // 只记录xx级别或以上的日志
   log.SetLevel(log.TraceLevel)
}

func method2() {
   log.WithFields(log.Fields{
      "animal": "walrus",
      "size":   10,
   }).Info("A group of walrus emerges from the ocean")

   log.WithFields(log.Fields{
      "omg":    true,
      "number": 122,
   }).Warn("The group's number increased tremendously!")

   log.WithFields(log.Fields{
      "omg":    true,
      "number": 100,
   }).Fatal("The ice breaks!")
}
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Formatter一般分为两种：

• &log.JSONFormatter{}
• &log.TextFormatter{}

日志级别一共七种：

• log.Trace()
• log.Debug()
• log.Info()
• log.Warn()
• log.Error()
• log.Fatal()
• log.Panic()

4 输出日志到文件

package main

import (
	"context"
	"github.com/sirupsen/logrus"
	"os"
)

func main() {
	method4()
}

func method4() {
   var log = logrus.New()
   file ,err := os.OpenFile("logrus.log", os.O_CREATE|os.O_WRONLY, 0666)
   if err == nil{
      log.Out = file
   }else{
      log.Info("Failed to log to file")
   }

   log.WithFields(logrus.Fields{
      "filename": "123.txt",
   }).Info("This is a file log")
}
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logrus.log文件的内容：

time="2022-01-06T13:04:25+08:00" level=info msg="This is a file log" filename=123.txt\
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5 利用Hooks将日志输出到其他地方

import (
  log "github.com/sirupsen/logrus"
  "gopkg.in/gemnasium/logrus-airbrake-hook.v2" // the package is named "airbrake"
  logrus_syslog "github.com/sirupsen/logrus/hooks/syslog"
  "log/syslog"
)

func init() {

  // 使用气闸挂钩来报告错误严重程度或以上的错误一个异常追踪。您可以创建自定义钩子，请参见钩子部分。
  log.AddHook(airbrake.NewHook(123, "xyz", "production"))

  hook, err := logrus_syslog.NewSyslogHook("udp", "localhost:514", syslog.LOG_INFO, "")
  if err != nil {
    log.Error("Unable to connect to local syslog daemon")
  } else {
    log.AddHook(hook)
  }
}
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只需要在AddHook是添加相应的Hook就可以了