2023-07-08 aleph | Clojure Slack Archive

aleph

Jan 2023-07-08T13:51:08.834769Z

Hi guys, I am trying out Aleph with Reitit and Ring and I am running into a problem where my code would just hang up - don't know if this is the correct channel to ask for help, but maybe one of you guys has an idea. I have

(ns app.core
  (:require [aleph.http :as http]
            [reitit.ring :as ring]
            [ring.middleware.params :as params]
            [ring.middleware.json :refer [wrap-json-response]]
            [ring.util.response :refer [response]]))

(defn return-path-params-handler [req]
  (wrap-json-response (response (:path-params req))))

(def handler
  (params/wrap-params
   (ring/ring-handler
    (ring/router
     [["/print/:something" return-path-params-handler]])
    (ring/create-default-handler))))

(comment
  (def http-server (http/start-server #'handler {:port 8080}))
  ,)

When I do a request to I would expect the response to be

{
  "something": "some"
}

But I don't get a response, it just hangs up and also will not timeout. What am I missing here?

valerauko 2023-07-08T14:09:08.396109Z

does it work if you use something trivial for the handler? does (constantly {:status 200 :body "hello world"}) work?

Jan 2023-07-08T14:17:43.197419Z

Yes, that works

Jan 2023-07-08T14:23:02.749899Z

This also works

(defn return-path-params-handler [req]
  (-> (response (:something (:path-params req)))
      (assoc :headers {"content-type" "text/plain"})))

Seems to be related to wrap-json-response

Jan 2023-07-08T14:30:22.741899Z

Doing this also works

(defn return-path-params-handler [req]
  (-> (response (json/write-str {:something "some"}))
      (assoc :header {"content-type" "application/json"})))

I will leave it with that for now. Thank you for looking at it

valerauko 2023-07-08T15:39:15.108389Z

hmm i don't know how any of those ring utils work, but i've only seen an aleph server "hang" when the handler returns nil

Jan 2023-07-08T15:45:23.318119Z

Problem was that I called wrap-json-response on the response and not the handle itself

Jan 2023-07-08T15:46:28.955089Z

That is wrap-json-response returns a handler and not a response

valerauko 2023-07-08T15:49:57.135819Z

glad it's figured out! 🚀

Jan 2023-07-08T15:51:53.611569Z

🙏

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