Golang — With Logging

In the Last Article, we discussed Integrating MySQL with Go. In this article, we will discuss how to configure a file logger in Go.

For configuring log file, we will first download logrus dependency.

go get -u github.com/sirupsen/logrus

Once we have the dependency, we will import it to our code,

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

Create file object to open file from a custom path,

file, err := OpenFile(logFile, O_RDWR|O_CREATE|O_APPEND, 0666)

And set this file as Output for logrus.

log.SetOutput(file)

Thats It. We have now configured our logger to point to a custom file path.

We can also se the formatter for the log file to JSON or Text Formatter.

log.SetFormatter(&log.TextFormatter{})
log.SetFormatter(&log.JSONFormatter{})

Following is the complete function to configure a log file.

func InitializeLogging(logFile string) {

   var file, err = OpenFile(logFile, O_RDWR|O_CREATE|O_APPEND, 0666)
   if err != nil {
      fmt.Println("Could Not Open Log File : " + err.Error())
   }
   log.SetOutput(file)

   //log.SetFormatter(&log.TextFormatter{})
   log.SetFormatter(&log.JSONFormatter{})
}

We can print logs using print or fatal commands of logrus.

log.Println("Something Happened!!")
log.Fatalf("What Happened??")

Complete code for this can be accessed through the Github Repo.

I hope you find it helpful. If you have any suggestions, please feel free to drop a comment.

In the Next Article, we will discuss how to add test cases for a Go Project.