Re: #'lamina.core. - No implementation of method: :enqueue for class: nil

[Nasko]

Thanks for the insight. I am indeed using Compojure for routing and wasn't 
aware it returns nil by default. For reference, here is the 
wrapped-sync-app function along with sync-app which is used to render a 
response from the chat page: 
(defn sync-app [request]
  {:status 200
   :headers {"content-type" "text/html"}
   :body (page)})

(def wrapped-sync-app
  "Wraps the response with static files"
  (-> sync-app
  (wrap-resource "public")
  (wrap-file-info)))Enter code here...



On Sunday, March 6, 2016 at 7:01:17 AM UTC-6, red...@gmail.com wrote:
>
> On 03/05/2016 10:18 PM, Nasko wrote: 
> > I am trying to implement a simple asynchronous chat service using Aleph 
> > and Lamina. However, it looks like the enqueue function coming from 
> > lamina cannot be implemented and causes an exception. This is what my 
> > chat function looks like: 
> > | 
> > (defn chat [ch request] 
> >   "View handler that handles a chat room. If it's not 
> >   a websocket request then return a rendered html response." 
> >   (let [params(:route-paramsrequest) 
> > room   (:room params)] 
> > (if(:websocket request) 
> >   (chat-handler ch room) 
> >   (enqueue ch (wrapped-sync-app request) 
> > | 
> > I don't understand why the value of (wrapped-sync-app request) is nil. 
> > Any feedback would be helpful. 
>
> Hard to say, since you don't give a definition for the wrapped-sync-app 
> function. Some google and it shows up in a few example apps as some kind 
> of ring handler. If you are using compojure (maybe other routing 
> libraries) returning nil is what it does by default if no routes match a 
> give request (as a result of how it determines if a route matches). 
>
> But looking at your subject line, given that error it is likely 'ch' is 
> nil, not the result of calling wrapped-sync-app. I would sprinkle 
> printlns liberally throughout. 
>
> As an aside, your docstring (if you intend it to be a docstring) is in 
> the wrong place. Docstrings go before the argument vector if you want 
> them to be accessible via 'doc' in the repl. 
> https://github.com/jonase/eastwood has a linter that catches this kind 
> of thing. 
>
> > 
> > -- 
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>  
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>
>
> -- 
> And what is good, Phaedrus, 
> And what is not good— 
> Need we ask anyone to tell us these things? 
>

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Re: #'lamina.core. - No implementation of method: :enqueue for class: nil

[Kevin Downey]

On 03/05/2016 10:18 PM, Nasko wrote:
> I am trying to implement a simple asynchronous chat service using Aleph
> and Lamina. However, it looks like the enqueue function coming from
> lamina cannot be implemented and causes an exception. This is what my
> chat function looks like:
> |
> (defn chat [ch request]
>   "View handler that handles a chat room. If it's not
>   a websocket request then return a rendered html response."
>   (let [params(:route-paramsrequest)
> room   (:room params)]
> (if(:websocket request)
>   (chat-handler ch room)
>   (enqueue ch (wrapped-sync-app request)
> |
> I don't understand why the value of (wrapped-sync-app request) is nil.
> Any feedback would be helpful.

Hard to say, since you don't give a definition for the wrapped-sync-app
function. Some google and it shows up in a few example apps as some kind
of ring handler. If you are using compojure (maybe other routing
libraries) returning nil is what it does by default if no routes match a
give request (as a result of how it determines if a route matches).

But looking at your subject line, given that error it is likely 'ch' is
nil, not the result of calling wrapped-sync-app. I would sprinkle
printlns liberally throughout.

As an aside, your docstring (if you intend it to be a docstring) is in
the wrong place. Docstrings go before the argument vector if you want
them to be accessible via 'doc' in the repl.
https://github.com/jonase/eastwood has a linter that catches this kind
of thing.

> 
> -- 
> You received this message because you are subscribed to the Google
> Groups "Clojure" group.
> To post to this group, send email to clojure@googlegroups.com
> Note that posts from new members are moderated - please be patient with
> your first post.
> To unsubscribe from this group, send email to
> clojure+unsubscr...@googlegroups.com
> For more options, visit this group at
> http://groups.google.com/group/clojure?hl=en
> ---
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> Groups "Clojure" group.
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> .
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-- 
And what is good, Phaedrus,
And what is not good—
Need we ask anyone to tell us these things?

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#'lamina.core. - No implementation of method: :enqueue for class: nil

[Nasko]

I am trying to implement a simple asynchronous chat service using Aleph and 
Lamina. However, it looks like the enqueue function coming from lamina 
cannot be implemented and causes an exception. This is what my chat 
function looks like:
(defn chat [ch request]
  "View handler that handles a chat room. If it's not
  a websocket request then return a rendered html response."
  (let [params (:route-params request)
room   (:room params)]
(if (:websocket request)
  (chat-handler ch room)
  (enqueue ch (wrapped-sync-app request)
I don't understand why the value of (wrapped-sync-app request) is nil. Any 
feedback would be helpful. 

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