Dynamic Router for Gin

dynamic_router.go

package main

import (
	"net/http"
	"sync"
	"time"

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

type dynamicRouter struct {
	h  http.Handler
	mu sync.Mutex
}

func main() {
	http.ListenAndServe(":8080", newDynamicRouter())
}

func newDynamicRouter() http.Handler {
	dr := &dynamicRouter{}
	e := gin.New()

	// Default routes
	e.GET("/users", func(ctx *gin.Context) {
		ctx.String(200, "Hello World")
	})
	dr.h = e

	go func() {

		// Change routes dynamic
		time.AfterFunc(10*time.Second, func() {

			// Build new handler exclude somes that u want.
			var newHandler = gin.New()
			newHandler.GET("/users", func(ctx *gin.Context) {
				ctx.String(200, "Hello World (new version)")
			})

			// TODO: try another way more secure
			dr.h = newHandler
		})
	}()

	return dr
}

func (dt *dynamicRouter) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	dt.h.ServeHTTP(w, r)
}

func (dt *dynamicRouter) SetHandler(h http.Handler) {
	dt.mu.Lock()
	defer dt.mu.Unlock()

	dt.h = h
}

Try curl http://127.0.0.1:8080/users

output: Hello World

After 10s

output: Hello World (new version)

Don't has any concurrency problems?