HTTP 路由器和中间件

Question

我正在使用 Julien Schmidt 的 GoLang 路由器，并试图让它与 Alice 一起工作以链接中间件。我收到此错误：

不能在 router.GET[= 的参数中使用 commonHandlers.ThenFunc(final)（类型 http.Handler）作为类型 httprouter.Handle 11=]

我不太清楚为什么。

我的代码是：

package main

import (
  "log"
    "net/http"

    "github.com/julienschmidt/httprouter"
  "github.com/justinas/alice"
    "gopkg.in/mgo.v2"
    //"gopkg.in/mgo.v2/bson"
)


func middlewareOne(next http.Handler) http.Handler {
  return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
    log.Println("Executing middlewareOne")
    next.ServeHTTP(w, r)
    log.Println("Executing middlewareOne again")
  })
}

func middlewareTwo(next http.Handler) http.Handler {
  return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
    log.Println("Executing middlewareTwo")
    if r.URL.Path != "/" {
      return
    }
    next.ServeHTTP(w, r)
    log.Println("Executing middlewareTwo again")
  })
}

func final(w http.ResponseWriter, r *http.Request) {
  log.Println("Executing finalHandler")
  w.Write([]byte("OK"))
}

func main() {
    session, err := mgo.Dial("conn-string")
    if err != nil {
        panic(err)
    }
    defer session.Close()
    session.SetMode(mgo.Monotonic, true)

    commonHandlers := alice.New(middlewareOne, middlewareTwo)

    router := httprouter.New()
    router.GET("/", commonHandlers.ThenFunc(final))

    http.ListenAndServe(":5000", router)
}

Answer 1

httprouter 的 router.GET 仅适用于 httprouter.Handle type. Use the Handler 方法 http.Handler:

router.Handler("GET", "/", commonHandlers.ThenFunc(final))

HTTP 路由器和中间件

HTTP Router and Middleware

middleware

go

go-alice