How to use different middleware for different routes

[captainviet]

Hi, I'm having a problem trying to define different middleware for different routes, please let me know if my understanding is correct and whether this behaviour is supported by the framework

Here it's mentioned that to use a middleware, application need to call Engine.Use(middleware), which in turns call engine.RouterGroup.Use(middleware) https://pkg.go.dev/github.com/gin-gonic/gin#Engine.Use

Here it's mentioned that application can define a group of routes that shares common middleware - which is what I want https://pkg.go.dev/github.com/gin-gonic/gin#RouterGroup.Group

However the engine is only attached to one RouterGroup, so not sure how to define multiple RouterGroups for an engine (and whether it's actually supported) https://pkg.go.dev/github.com/gin-gonic/gin#Engine

Here it's mentioned that once Run, the engine will block the goroutine, so not sure if it's possible to define multiple engine, one per router group (and whether it's recommended to do so) https://pkg.go.dev/github.com/gin-gonic/gin#Engine.Run

[cp-sumi-k]

Hello @captainviet, If I understood your question correctly, here is the solution.

Define RouterGroup Like ,

r := gin.Default()

Then apply middleware as per requirement on this routergroup like,

rg1 := r.Group("/group1", middleware1())

rg2 := r.Group("/group2", middleware2())

then use different routes like,

rg1.GET("/", handler1)

rg2.GET("/", handler2)

[yeqown]

As a supplement, you can add middlewares on a handler directly:

g.GET("/path", middleware1, middleware2, handler)

https://github.com/gin-gonic/gin/blob/b01605bb5b43dbf33781970af5ad6633e5549fd1/routergroup.go#L71-L77 https://github.com/gin-gonic/gin/blob/b01605bb5b43dbf33781970af5ad6633e5549fd1/routergroup.go#L209-L220

[captainviet]

Hi @cp-sumi-k , thanks for your suggestion, let us try it out!

thanks @yeqown for the suggestion also!

[spiropoulos94]

Another way of applying middlewares to grouped routes is the following :

testGroup := router.Group("/test").Use(middleWare())

        testGroup.GET("/a", controllers.Testa)
        testGroup.GET("/b", controllers.Testb)
        testGroup.GET("/c", controllers.Testc)

[gokul1630]

I just tried the below one, works fine for each route handler:

func YourCustomMiddleWare(context *gin.Context){
     context.AbortWithStatusJSON(404, map[string]string{"message": "route not found"})
}

r.GET("/fetch-data", YourCustomMiddleWare, controllers.YourFunc)