Simple page view counter atomic

main.go

package main

import (
	"fmt"
	"sync/atomic"

	"github.com/gin-gonic/gin"
)

func main() {
	var counter int32 = 0

	r := gin.Default()

	r.GET("/", func(c *gin.Context) {
		atomic.AddInt32(&counter, 1)
		c.String(200, "Hello world")
	})

	r.GET("/stats", func(c *gin.Context) {
		c.String(200, fmt.Sprintf("Number of page view: %d", atomic.LoadInt32(&counter)))
	})

	r.Run()
}