使用compojure.route/resources和ring.middleware.resource/wrap-resource

Question

我正在尝试用ring和compojure学习clojure web开发,我对compojure.route/resourcesand 的用法有点不清楚ring.middleware.resource/wrap-resource.

我已经看过了API文档,以及两者的来源compojure.route和ring.middleware.resource.但是,我仍然不清楚是否需要使用compojure.route/resources路由和ring.middleware.resource/wrap-resource中间件,或者是否compojure.route/resources需要处理所有事情.

还是优化问题？在使用中,wrap-resource避免使用组件路由开销？任何见解将不胜感激.

Answer 1

主要区别compojure.route/resources仅在于提供来自特定路径的资源:

 (let [root (:root options "public")]
      (resource-response (str root "/" resource-path))

但是ring.middleware.resource/wrap-resource如果没有找到资源,则在处理程序上提供故障恢复机制:

 (or (response/resource-response path {:root root-path})
     (handler request))

当你从看到的resource-response功能两种选择使用:

 (defn resource-response
  "Returns a Ring response to serve a packaged resource, or nil if the
   resource does not exist.
  Options:
    :root - take the resource relative to this root"

nil如果找不到请求的资源,则返回.

因此,wrap-resource如果您已经有路线,则替代方案更适合链接,如:

(defroutes routes
  (GET "/" [] "<h1>Hello World</h1>")
  (route/not-found "<h1>Page not found</h1>"))

(def app (-> routes 
             (wrap-resource "public/resources"))

而且compojure.route/resources您可以使用路线组成,如:

 (defroutes resources-routes
    (route/resources "/"))

 (defroutes routes
   (GET "/" [] "<h1>Hello World</h1>")
   (route/not-found "<h1>Page not found</h1>"))

 (def app
   (compojure.core/routes
       resources-routes
       routes))