On 03/13/2017 09:38 AM, 'Rickesh Bedia' via Clojure wrote:
> I am trying to start my clojure application on my heroku dyno but I keep
> getting and error in my stuartsierra.component/start.
>
> Below is my core file containing my main function.
>
> (defrecord Listener [listener]
> component/Lifecycle
> (start [component]
> (assoc component :listener (yada/listener
> ["/"
> [(view/view-route)
> routes/route-handler
> ["public/" (new-directory-resource
> (io/file "target/cljsbuild/public") {})]
> [true (as-resource nil)]]]
> (or (env :port) (get (read-config
> "resources/config.edn" {:profile :dev}) :webserver))
resources/config.edn is likely incorrect, depending on how you are
running your app. The "resources/" directory is typically on the
classpath, so you refer a file in it as just "config.edn". Referring to
it as "resources/config.edn" is the kind of thing that will work
sometimes at the repl, but depending on how you are packaging and
deploying you app will fail.
The file business with target/ is also something that is likely to fail.
I am not familiar with how heroku deploys clojure, but it looks like
they build an uberjar and run that, so if you want to see how your code
will work there run `lein uberjar` then `java -jar your-uberjar.jar`.
> )))
> (stop [component]
> (when-let [close (-> component :listener :close)]
> (close))
> (assoc component :listener nil)))
>
> (defn new-system []
> (component/system-map
> :listener (map->Listener {})
> ))
>
> (def system nil)
>
> (defn init []
> (alter-var-root #'system
> (constantly (new-system))))
>
> (defn start []
> (alter-var-root #'system component/start))
>
> (defn stop []
> (alter-var-root #'system
> (fn [s] (when s (component/stop s)))))
>
> (defn go []
> (init)
> (start))
>
> (defn reset []
> (stop)
> (refresh :after 'web.core/go))
>
> (defn -main
> [& [port]]
> (component/start (new-system))
> (println "System Started")
> @(promise))
>
> This is my core file with all my stuartsierra.component code. This all
> works perfectly when I run it locally on my laptop doing lein repl and
> then (go) and also when I just do lein run. So I am confused as to why
> it doesn't work when I push this to the heroku dyno.
>
> The error I get is
>
> Exception in thread "main" clojure.lang.ExceptionInfo: Error in
> component :listener in system com.stuartsierra.component.SystemMap
> calling #'com.stuartsierra.component/start {:reason
> :com.stuartsierra.component/component-function-threw-exception,
> :function #'com.stuartsierra.component/start, :system-key :listener,
> :component #web.core.Listener{:listener nil}, :system #<SystemMap>},
> compiling:(/tmp/form-init9049917434081554913.clj:1:73)
> This is telling me that my :listener is nil in the system-map. When I
> check locally (doing lein repl (go)) in (keys system) is (:listener)
> which is good so that means that the listener is starting and is in the
> system.
>
> When I do (-> system :listener) I get #web.core.Listener{:listener
> {:port 3300, :close #object[yada.aleph$listener$fn__21671 0xa5d4865
> "yada.aleph$listener$fn__21671@a5d4865"], :server
> #object[aleph.netty$start_server$reify__13574 0x3cc9a232
> "aleph.netty$start_server$reify__13574@3cc9a232"]}} which is perfect as
> the port has loaded up (3300) and the server has started.
>
> This makes it all the more confusing as to why the :listener is nil in
> my heroku app
>
> Any help would be much appreciated. Thanks
>
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And what is not good—
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