How to log gin's logs to file and console

gin_log_to_file.md

Gin Log to file

The following code will writes gin's logs to both console and to the file. The example also uses lumberjack to implement the log rotation mechanism.

NOTE: When using this configuration the console logs will not show colors

package main

import (
	"io"
	"os"

	"github.com/gin-gonic/gin"
	"gopkg.in/natefinch/lumberjack.v2"
)

func main() {
	// Configure lumberjack for log rotation
	logFile := &lumberjack.Logger{
		Filename:   "app.log",
		MaxSize:    10, // MB
		MaxBackups: 5,
		MaxAge:     28,   // days
		Compress:   true, // compress rotated files
	}

	// Create a multi-writer to write to both stdout and the log file
	multiWriter := io.MultiWriter(os.Stdout, logFile)
	gin.DefaultWriter = multiWriter      // Sets the writer for Gin's logger
	gin.DefaultErrorWriter = multiWriter // If you also want to log recovery (panic) to the file

	r := gin.Default()
	r.GET("/ping", func(c *gin.Context) {
		c.JSON(200, gin.H{
			"message": "pong",
		})
	})

	r.Run() // listen and serve on 0.0.0.0:8080