OK, took my usual approach when stuck, which is to try and turn it into a
different problem! Decided to stop trying to use handle* directly, but
rather explicitly start an nREPL server on a socket, and relay those
messages over websocket. Seems to work fine :-)
Thanks,
Jony
On Thursday, 27 February 2014 17:58:27 UTC, Jony Hudson wrote:
>
> Hi Folks,
>
> I'm stuck and would like a bit of help. This is following on from a
> question I posted to clojure.tools, but I've reduced the problem to its
> essence, and figure it might get a few more eyes on it here. My apologies
> to anyone who has to suffer reading about it twice :-)
>
> My actual problem is that I'm unable to get a Websocket transport for
> gorilla-repl running. But I think I've boiled down the problem to something
> that doesn't involve websockets. I'm trying to handle messages with nREPL.
> If I run the following in the REPL to make an nREPL handler:
>
> (require '[clojure.tools.nrepl.transport :as transport])
> (require '[clojure.tools.nrepl.server :as nrepl-server])
>
> (def handler (nrepl-server/default-handler))
>
> (def trans (transport/fn-transport nil println))
>
> (nrepl-server/handle* {:op "clone"} handler trans)
>
> Then everything goes as I would hope. The nREPL server replies with a
> new-session message, which is printed to the console by the dopey transport
> I've provided. If I then lift the new session ID (copy and paste) and send
> an evaluation message to the nREPL handler
>
> (nrepl-server/handle* {:op "eval" :code "(+ 1 5)" :session
> "2c8b0464-7e09-4c94-81d7-c4e0c7d1314f"} handler trans)
>
> It works as I'd expect, replying with the value and a 'done' status
> message.
>
> {status #{:done}, session 2c8b0464-7e09-4c94-81d7-c4e0c7d1314f}
> {ns user, value 6, session 2c8b0464-7e09-4c94-81d7-c4e0c7d1314f}
>
> The problem comes if I try and execute the same command again, which
> should I would have thought should give the same answer, but instead I get
> an extremely long stack trace, a snippet of which is below.
>
> Exception in thread "nREPL-worker-0" java.lang.StackOverflowError
> at clojure.lang.RestFn.applyTo(RestFn.java:130)
> at clojure.core$apply.invoke(core.clj:617)
> at clojure.core$prn.doInvoke(core.clj:3367)
> at clojure.lang.RestFn.applyTo(RestFn.java:137)
> at clojure.core$apply.invoke(core.clj:617)
> at clojure.core$println.doInvoke(core.clj:3387)
> at clojure.lang.RestFn.invoke(RestFn.java:408)
> at clojure.tools.nrepl.transport.FnTransport.send(transport.clj:28)
> at
> clojure.tools.nrepl.middleware.pr_values$pr_values$fn$reify__2353.send(pr_values.clj:23)
> at
> clojure.tools.nrepl.middleware.session$session_out$fn__2437.invoke(session.clj:51)
> at
> clojure.tools.nrepl.middleware.session.proxy$java.io.Writer$0.flush(Unknown
> Source)
> at
> clojure.tools.nrepl.middleware.session$session_out$fn__2444.doInvoke(session.clj:44)
> at clojure.lang.RestFn.invoke(RestFn.java:460)
> at
> clojure.tools.nrepl.middleware.session.proxy$java.io.Writer$0.write(Unknown
> Source)
> at java.io.PrintWriter.write(PrintWriter.java:456)
> at java.io.PrintWriter.write(PrintWriter.java:473)
> at clojure.core$fn__5420.invoke(core_print.clj:187)
> at clojure.lang.MultiFn.invoke(MultiFn.java:231)
> at clojure.core$pr_on.invoke(core.clj:3322)
> at clojure.core$print_map$fn__5428.invoke(core_print.clj:200)
> at clojure.core$print_sequential.invoke(core_print.clj:58)
> at clojure.core$print_map.invoke(core_print.clj:203)
> at clojure.core$fn__5431.invoke(core_print.clj:207)
> at clojure.lang.MultiFn.invoke(MultiFn.java:231)
> at clojure.core$pr_on.invoke(core.clj:3322)
> at clojure.core$pr.invoke(core.clj:3334)
> at clojure.lang.AFn.applyToHelper(AFn.java:161)
> at clojure.lang.RestFn.applyTo(RestFn.java:132)
> at clojure.core$apply.invoke(core.clj:617)
> at clojure.core$prn.doInvoke(core.clj:3367)
> at clojure.lang.RestFn.applyTo(RestFn.java:137)
> at clojure.core$apply.invoke(core.clj:617)
> at clojure.core$println.doInvoke(core.clj:3387)
> at clojure.lang.RestFn.invoke(RestFn.java:408)
> at clojure.tools.nrepl.transport.FnTransport.send(transport.clj:28)
> at
> clojure.tools.nrepl.middleware.pr_values$pr_values$fn$reify__2353.send(pr_values.clj:23)
> at
> clojure.tools.nrepl.middleware.session$session_out$fn__2437.invoke(session.clj:51)
> at
> clojure.tools.nrepl.middleware.session.proxy$java.io.Writer$0.flush(Unknown
> Source)
> at
> clojure.tools.nrepl.middleware.session$session_out$fn__2444.doInvoke(session.clj:44)
> [snip]
>
> Somehow, drawbridge gets this to work, even though as far as I can tell
> I'm doing the same thing. I can't figure out what's going on. Help!
>
> Thanks,
>
>
> Jony
>
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