package main

import (
  "os"

  "github.com/sirupsen/logrus"
  log "github.com/sirupsen/logrus"
)

var logger *logrus.Entry

func init() {
  // 設置日志格式為json格式
  log.SetFormatter(&log.JSONFormatter{})
  log.SetOutput(os.Stdout)
  log.SetLevel(log.InfoLevel)
  logger = log.WithFields(log.Fields{"request_id": "123444", "user_ip": "127.0.0.1"})
}

func main() {
  logger.Info("hello, logrus....")
  logger.Info("hello, logrus1....")
  // 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!")
}

package main

import (
 "time"

 rotatelogs "github.com/lestrrat-go/file-rotatelogs"
 log "github.com/sirupsen/logrus"
)

func init() {
 path := "/Users/opensource/test/go.log"
 /* 日志輪轉(zhuǎn)相關函數(shù)
 `WithLinkName` 為最新的日志建立軟連接
 `WithRotationTime` 設置日志分割的時間，隔多久分割一次
 WithMaxAge 和 WithRotationCount二者只能設置一個
  `WithMaxAge` 設置文件清理前的最長保存時間
  `WithRotationCount` 設置文件清理前最多保存的個數(shù)
 */
 // 下面配置日志每隔 1 分鐘輪轉(zhuǎn)一個新文件，保留最近 3 分鐘的日志文件，多余的自動清理掉。
 writer, _ := rotatelogs.New(
 path+".%Y%m%d%H%M",
 rotatelogs.WithLinkName(path),
 rotatelogs.WithMaxAge(time.Duration(180)*time.Second),
 rotatelogs.WithRotationTime(time.Duration(60)*time.Second),
 )
 log.SetOutput(writer)
 //log.SetFormatter(&log.JSONFormatter{})
}

func main() {
 for {
 log.Info("hello, world!")
 time.Sleep(time.Duration(2) * time.Second)
 }
}

package main

import (
  "fmt"
  "log"
)

func init() {
  log.SetPrefix("【UserCenter】")              // 設置每行日志的前綴
  log.SetFlags(log.LstdFlags | log.Lshortfile | log.LUTC) // 設置日志的抬頭字段
}

func main() {
  log.Println("log...")
  log.Fatalln("Fatal Error...")
  fmt.Println("Not print!")
}

package main

import (
  "io"
  "log"
  "os"
)

var (
  Info  *log.Logger
  Warning *log.Logger
  Error  *log.Logger
)

func init() {
  errFile, err := os.OpenFile("errors.log", os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
  if err != nil {
    log.Fatalln("打開日志文件失?。?, err)
  }

  Info = log.New(os.Stdout, "Info:", log.Ldate|log.Ltime|log.Lshortfile)
  Warning = log.New(os.Stdout, "Warning:", log.Ldate|log.Ltime|log.Lshortfile)
  Error = log.New(io.MultiWriter(os.Stderr, errFile), "Error:", log.Ldate|log.Ltime|log.Lshortfile)
}

func main() {
  Info.Println("Info log...")
  Warning.Printf("Warning log...")
  Error.Println("Error log...")
}