Sieppari

[metosin/reitit-sieppari "0.5.12"]

Sieppari is a new and fast interceptor implementation for Clojure, with pluggable async supporting core.async, Manifold and Promesa.

To use Sieppari with reitit-http, we need to attach a reitit.interceptor.sieppari/executor to a http-router to compile and execute the interceptor chains. Reitit and Sieppari share the same interceptor model, so all reitit default interceptors work seamlessly together.

We can use both synchronous ring and async-ring with Sieppari.

Synchronous Ring

(require '[reitit.http :as http])
(require '[reitit.interceptor.sieppari :as sieppari])

(defn i [x]
  {:enter (fn [ctx] (println "enter " x) ctx)
   :leave (fn [ctx] (println "leave " x) ctx)})

(defn handler [_]
  (future {:status 200, :body "pong"}))

(def app
  (http/ring-handler
    (http/router
      ["/api"
       {:interceptors [(i :api)]}

       ["/ping"
        {:interceptors [(i :ping)]
         :get {:interceptors [(i :get)]
               :handler handler}}]])
    {:executor sieppari/executor}))

(app {:request-method :get, :uri "/api/ping"})
;enter  :api
;enter  :ping
;enter  :get
;leave  :get
;leave  :ping
;leave  :api
;=> {:status 200, :body "pong"}

Async-ring

(let [respond (promise)]
  (app {:request-method :get, :uri "/api/ping"} respond nil)
  (deref respond 1000 ::timeout))
;enter  :api
;enter  :ping
;enter  :get
;leave  :get
;leave  :ping
;leave  :api
;=> {:status 200, :body "pong"}

Examples

Simple

• simple example, with both sync & async code:
  • https://github.com/metosin/reitit/tree/master/examples/http

With batteries

• with default interceptors, coercion and swagger-support:
  • https://github.com/metosin/reitit/tree/master/examples/http-swagger