在使用过程中,如何将封闭与大猩猩/多路复用子路由器一起使用?

问题描述:

There seem to be all sorts of examples of using a HandlerFunc closure similar to this one: http://codegangsta.gitbooks.io/building-web-apps-with-go/content/controllers/README.html

However I can't get it to work with a subrouter. Example:

func MyHandler(renderer *render.Render) http.Handler {
    return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
        renderer.HTML(rw, http.StatusOK, "subroute/index", nil)
    })
}

func main() {
    renderer := render.New(render.Options{Layout: "base"})
    router := mux.NewRouter().StrictSlash(false)

    router.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        ...
    })

    subroutes := router.Path("/subroute").Subrouter()
    subroutes.Methods("GET").HandlerFunc(MyHandler(renderer))

    http.Handle("/", router)

    log.Println("Listening...")
    http.ListenAndServe(":3000", nil)
}

Gives me this error:

cannot use MyHandler(renderer) (type http.Handler) as type func(http.ResponseWriter, *http.Request) in function argument

Any insights into what I'm doing wrong?

似乎有使用HandlerFunc闭包的各种示例,类似于以下示例: http://codegangsta.gitbooks.io/building-web-apps-with -go / content / controllers / README.html p>

但是我无法将其与子路由器一起使用。 示例: p>

  func MyHandler(renderer * render.Render)http.Handler {
 return http.HandlerFunc(func(rw http.ResponseWriter,r * http.Request){  
 renderer.HTML(rw,http.StatusOK,“ subroute / index”,nil)
})
} 
 
func main(){
 renderer:= render.New(render.Options {Layout:  “ base”})
路由器:= mux.NewRouter()。StrictSlash(false)
 
 router.HandleFunc(“ /”,func(w http.ResponseWriter,r * http.Request){
 ..  。
})
 
子路由:= router.Path(“ / subroute”)。Subrouter()
子路由.Methods(“ GET”)。HandlerFunc(MyHandler(renderer))
 
 http.Handle  (“ /”,路由器)
 
 log.Println(“ Listening ...”)
 http.ListenAndServe(“:3000”,nil)
} 
  code>  pre> 
  
 

给我这个错误: p>

 不能在其中使用MyHandler(renderer)(类型为http.Handler)作为func(http.ResponseWriter,* http.Request)类型 函数参数
  code>  pre> 
 
 

对我在做什么的任何见解? p> div>

The HandlerFunc method on Route expects to be passed a function, as the error message indicates. If instead you have an http.Handler, call Handler instead:

subroutes.Methods("GET").Handler(MyHandler(renderer))

Or alternatively, have your MyHandler function return the handler function directly rather than wrapping it as an http.Handler. Which option you choose is going to be a matter of style, and depend on the rest of your program.