Simple page view counter - mutex

main.go

package main

import (
	"fmt"
	"sync"

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

func main() {
	counter := 0
	var m sync.Mutex

	r := gin.Default()

	r.GET("/", func(c *gin.Context) {
		m.Lock()
		defer m.Unlock()
		counter++
		c.String(200, "Hello world")
	})

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

	r.Run()
}