go 日志库logrus

1. logrus

1. 日志库

2. 包路径："github.com/sirupsen/logrus"

3. 快速入门例子：

   	package main
   
   import (
     "os"
     log "github.com/sirupsen/logrus"
   )
   
   func init() {
     // Log as JSON instead of the default ASCII formatter.
     log.SetFormatter(&log.JSONFormatter{})
   
     // Output to stdout instead of the default stderr
     // Can be any io.Writer, see below for File example
     log.SetOutput(os.Stdout)
   
     // Only log the warning severity or above.
     log.SetLevel(log.WarnLevel)
   }
   
   func main() {
     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!")
   
     // A common pattern is to re-use fields between logging statements by re-using
     // the logrus.Entry returned from WithFields()
     contextLogger := log.WithFields(log.Fields{
       "common": "this is a common field",
       "other": "I also should be logged always",
     })
   
     contextLogger.Info("I'll be logged with common and other field")
     contextLogger.Info("Me too")
   }

2. 使用

1. 设置输出格式

1. json格式

  log.SetFormatter(&log.JSONFormatte
  
  // example
  {"level":"fatal","msg":"The ice breaks!","number":100,"omg":true,
"time":"2014-03-10 19:57:38.562543128 -0400 EDT"}

1. 文本格式

   	log.SetFormatter(&log.TextFormatter{})
   	
   	// example
   	time="2015-03-26T01:27:38-04:00" level=debug msg="Started observing beach" animal=walrus number=8

2. 更多见文档

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