There is an extra option in the Ring router (actually, in the underlying middleware-router): :reitit.middleware/transform
to transform the middleware chain per endpoint. Value should be a function or a vector of functions that get a vector of compiled middleware and should return a new vector of middleware.
(require '[reitit.ring :as ring])
(require '[reitit.middleware :as middleware])
(defn wrap [handler id]
(fn [request]
(handler (update request ::acc (fnil conj []) id))))
(defn handler [{::keys [acc]}]
{:status 200, :body (conj acc :handler)})
(def app
(ring/ring-handler
(ring/router
["/api" {:middleware [[wrap 1] [wrap 2]]}
["/ping" {:get {:middleware [[wrap 3]]
:handler handler}}]])))
(app {:request-method :get, :uri "/api/ping"})
; {:status 200, :body [1 2 3 :handler]}
(def app
(ring/ring-handler
(ring/router
["/api" {:middleware [[wrap 1] [wrap 2]]}
["/ping" {:get {:middleware [[wrap 3]]
:handler handler}}]]
{::middleware/transform reverse})))
(app {:request-method :get, :uri "/api/ping"})
; {:status 200, :body [3 2 1 :handler]}
(def app
(ring/ring-handler
(ring/router
["/api" {:middleware [[wrap 1] [wrap 2]]}
["/ping" {:get {:middleware [[wrap 3]]
:handler handler}}]]
{::middleware/transform #(interleave % (repeat [wrap :debug]))})))
(app {:request-method :get, :uri "/api/ping"})
; {:status 200, :body [1 :debug 2 :debug 3 :debug :handler]}
[metosin/reitit-middleware "0.7.2"]
Using reitit.ring.middleware.dev/print-request-diffs
transformation, the request diffs between each middleware are printed out to the console. To use it, add the following router option:
:reitit.middleware/transform reitit.ring.middleware.dev/print-request-diffs
Sample output:
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