Re: ClojureScript repl over proxy

[Lars Rune Nøstdal]

Hi,
I would stick with SSH tunnels for this tbh.. Because once you fix this 
particular issue right here, there's 2-3 similar issues showing up in 2-4 
months; who knows. I use a tiny bash script in each project that deals with 
the particular ports needed.

mvh, L

On Wednesday, April 21, 2021 at 8:40:35 PM UTC+3 rv.m...@gmail.com wrote:

> Hi,
>
> I'm using a cloud development platform (Gitpod) and it automatically 
> creates proxy from public URL to localhost, so you can develop a web 
> application from cloud and see the result. I'm trying to run cljs REPL, but 
> it fails to connect because it tries to connect to the REPL on 
> `localhost:9090` which is not accessible from outside because I use public 
> URL in a browser.
>
> I have looked at the code and looks like HOST and PORT in browser 
> hard-coded
>
> https://github.com/clojure/clojurescript/blob/a4673b880756531ac5690f7b4721ad76c0810327/src/main/cljs/clojure/browser/repl.cljs#L31
>  
> but still maybe I have missed something, and it's possible to set up REPL 
> for my use case. So would be glad to any response
>
> Thanks
>

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Re: Clojure, JVM and/or ASM bug?

[Lars Rune Nøstdal]

On Wednesday, February 6, 2019 at 5:15:53 PM UTC+2, Alex Miller wrote:
>
> I think the condition here means that the loop compilation can't tell that 
> the s local is definitely out of scope and can be cleared, so you end up 
> holding the head.
>
> While there is some analysis here, we're not doing inference level stuff 
> on the "if false" to knock out branches etc and generally that's not the 
> kind of thing we try to do.
>

I.e. WONTFIX? Using lazy sequences is or can be pretty dangerous without 
plenty and frequent testing, then -- since "don't hold onto the head" means 
one will have to take into account whatever code the compiler and/or 
libraries (c.c.async?) may or may not generate behind the scenes based on 
subtleties. 

H ...anyway, I'll try to work around this; perhaps by avoiding lazy 
sequences altogether. For me switching to clojure.core.async and doing 
something like this *seems* to have worked (perhaps useful for others who 
find this thread later):

   - wrap the range (or infinite or long sequence really) in a *source* chan 
   <https://clojuredocs.org/clojure.core.async/chan>.
   - do the transformation in a *middle* chan; noting that the chan Fn 
   takes an xform arg.
   - pipe <https://clojuredocs.org/clojure.core.async/pipe> the *middle* chan 
   to your final *output* chan. something like: *(async/pipe 
   (handle-source-chan (async/chan 1000 xform) ...) output-chan)*

...it's a bit tricky to setup -- but yeah; no leaks here for now. It's 
interesting that I have a sort of more explicit buffer in the *middle* chan 
I can fiddle around with too now!

Mvh, Lars

 

>
>
> On Wednesday, February 6, 2019 at 7:57:57 AM UTC-6, Lars Rune Nøstdal 
> wrote:
>>
>> Hi, so I've been staring at this for hours :
>>
>>
>> (defn foo []
>>   (let [s (range)]
>> (if false
>>   nil
>>   (future
>> (loop [s s]
>>   (recur (rest s)))
>>
>>
>> ...if I run this I run out of heap space quite fast on any of these:
>>
>>- Clojure: "1.11.0-master-SNAPSHOT", 1.9.0, 1.8.0 or 1.7.0
>>- OpenJ9 0.12.1 or Oracle 11.0.2 2018-10-16 LTS
>>
>>
>> ..that's what I have at hand for testing for now. If I remove the FUTURE 
>> or place it higher up the stack it doesn't happen. I looked at a heap dump 
>> in MAT and it seems to contain millions of empty stack frames or binding 
>> frames (conveyor?); all held together by circular references (AFAICT).
>>
>> -- 
>> Mvh, Lars Rune Nøstdal
>> https://www.quanto.ga/
>>
>>

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Clojure, JVM and/or ASM bug?

[Lars Rune Nøstdal]

Hi, so I've been staring at this for hours :


(defn foo []
  (let [s (range)]
(if false
  nil
  (future
(loop [s s]
  (recur (rest s)))


...if I run this I run out of heap space quite fast on any of these:

   - Clojure: "1.11.0-master-SNAPSHOT", 1.9.0, 1.8.0 or 1.7.0
   - OpenJ9 0.12.1 or Oracle 11.0.2 2018-10-16 LTS


..that's what I have at hand for testing for now. If I remove the FUTURE or 
place it higher up the stack it doesn't happen. I looked at a heap dump in 
MAT and it seems to contain millions of empty stack frames or binding 
frames (conveyor?); all held together by circular references (AFAICT).

-- 
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https://www.quanto.ga/

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Re: [ANN] nREPL 0.4.5 released!

[Lars Rune Nøstdal]

Hi,
I still get this when I do `cider-jack-in`: 
   ;; CIDER 0.18.0 (package: 20180902.1638) (Saigon), nREPL 0.2.13


..I've removed all mentions of "nrepl" in package.clj, but it seems lein (I 
think?) still loads the old 0.2.13 version.

Thanks for your work on this stuff by the way; it's fantastic!

mvh,
Lars

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Re: [ANN] Clojure 1.8.0-beta1

[Lars Rune Nøstdal]

Just a heads up that http://dev.clojure.org/jira/browse/CLJ-1809 is still a 
problem. A lot of Clojure code fails to compile now. I hope this will be 
fixed before 1.8 final is out.

On Tuesday, October 13, 2015 at 4:01:06 PM UTC+2, Alex Miller wrote:
>
> Clojure 1.8.0-beta1 is now available.
>
> Try it via
>
>- Download: 
>https://repo1.maven.org/maven2/org/clojure/clojure/1.8.0-beta1
>- Leiningen: [org.clojure/clojure "1.8.0-beta1"]
>
> Below is a list of the other changes included in beta1. See the full 
> change log here: https://github.com/clojure/clojure/blob/master/changes.md
> .
>
>
>- CLJ-1456  Compiler now 
>errors if too few or too many arguments to throw
>- CLJ-1282  quote now 
>throws if passed more or less than one arg
>- CLJ-1210  Improved 
>error message for (clojure.java.io/reader nil)
>- CLJ-1414  sort and 
>sort-by now indicate sort is stable in docstring
>- CLJ-1765  areduce 
>performance improvements
>- CLJ-1724  Remove 
>unnecessary call to seq() in LazySeq.hashCode()
>- CLJ-1295  Improved 
>array-map dissoc performance
>- CLJ-1277  Speed up 
>printing of time instants with type hints
>- CLJ-1259  Speed up 
>pprint and cl-format with type hints
>- CLJ-668  Improve slurp 
>performance by using StringWriter and jio/copy
>- CLJ-1810  ATransientMap 
>now marked public
>- CLJ-1653  str of an 
>empty list should be "()"
>- CLJ-1567  Removed 
>unused local in condp implementation
>- CLJ-1351  Unused 
>swapThunk method was being emitted for fns with keyword callsites
>- CLJ-1329  Removed 
>unused local in PersistentVector.cons()
>- CLJ-1380  3-arg 
>ExceptionInfo constructor permitted nil data
>- CLJ-1226  set! of a 
>deftype field using field-access syntax caused ClassCastException
>
>

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clojure 1.8 java.lang.VerifyError method: invokeStatic signature: Can only throw Throwable objects

[Lars Rune Nøstdal]

Hi,
Anyone playing around with 1.8 from Git? It has problems compiling this for 
some reason:

(defn blah []
  (let [a (atom nil)
b nil]
(try
  (println "hi")
  (catch Throwable e
(println e))
  (finally
(when (and (deref a) b)
  (println "huh"))

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Re: clojure 1.8 java.lang.VerifyError method: invokeStatic signature: Can only throw Throwable objects

[Lars Rune Nøstdal]

On Thursday, October 1, 2015 at 12:59:39 PM UTC+2, Nicola Mometto wrote:
>
>
> http://dev.clojure.org/jira/browse/CLJ-1809 
>

Awesome; thank you.

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Re: [ANN]: clj.jdbc 0.1-beta1 - Alternative implementation of jdbc wrapper for clojure.

[Lars Rune Nøstdal]

Looks interesting. It even has the issue tracker on github still enabled.

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defonce is not thread safe (racy)

[Lars Rune Nøstdal]

Hi,
defonce is not thread safe (racy).

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Re: Quartz and Clojure

[Lars Rune Nøstdal]

You've probably found this by now, but there's: 
https://github.com/mdpendergrass/quartz-clj

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Re: Downloading the documentation?

[Lars Rune Nøstdal]

The Clojure gh-pages branch contains the API docs, but as far as I can tell 
it doesn't contain the stuff found on clojure.org.

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Re: where can I find the official statement about changes from 1.2 to 1.3?

[Lars Rune Nøstdal]

https://github.com/clojure/clojure/blob/1.3.x/changes.txt I think.

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Getting Slime to catch exceptions from spawned threads

[Lars Rune Nøstdal]

How does one go about getting Slime to catch exceptions from spawned 
threads:

user (.start (Thread. (fn [] (/ 42 0   

The above exception ends up outside of Slime now; back in the terminal 
where `lein swank' was started.

I tried using a future also, but it has some properties I don't understand. 
This does not show an exception, even though the divide by zero must have 
happened(?):

user (let [it (future (/ 42 0))]
(Thread/sleep 100)
(println (realized? it)))
true
nil


..this does show the excpetion, but late:

user (let [it (future (/ 42 0))]
(Thread/sleep 100)
(println (realized? it))
(deref it))
true
; Evaluation aborted.


Agents catches exceptions within themselves for extraction later, but that 
isn't suitable in my current case.

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Re: Lein uberjar hangs when swank is required in the namespace.

[Lars Rune Nøstdal]

It's hanging here too, but I have no idea why; I'm not including swank.

Is there any verbose mode for lein?

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Re: Alright, fess up, who's unhappy with clojurescript?

[Lars Rune Nøstdal]

.. but isn't jQuery and ExtJS totally different things?

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Re: Alright, fess up, who's unhappy with clojurescript?

[Lars Rune Nøstdal]

I'd say Google Closure/Libray is more idiomatic JavaScript than jQuery; 
jQuery is more sugary and has a different feel to it.

I like jQuery, but I completely see why that is not a the most optimal base 
to build on when something like Google Closure exists. Rich mentioned, 
however, that people would probably wrap or include jQuery as a plugin 
anyway, i.e. not as a base thing, and this is ok and a much better strategy 
IMHO.

I didn't really understand your post about Yegge either.

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Clojure + PostgreSQL

[Lars Rune Nøstdal]

Hi guys,
Anyone using Clojure and PostgreSQL? I'm trying to access PostgreSQL 
using https://github.com/clojure/java.jdbc at the moment, but it seems to 
have trouble with simple inserts:

   (insert-record :temp {:parent 42}) 
  #PSQLException org.postgresql.util.PSQLException: A result was returned 
when none was expected.


..etc.. Perhaps I'm on the wrong track; what do you guys use or do?

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Re: Clojure + PostgreSQL

[Lars Rune Nøstdal]

Quick change to do-prepared* in internal.clj:



(defn do-prepared*
  Executes an (optionally parameterized) SQL prepared statement on the
  open database connection. Each param-group is a seq of values for all of
  the parameters.
  [return-keys sql  param-groups]
  (with-open [stmt (if return-keys
 (.prepareStatement (connection*) sql 
java.sql.Statement/RETURN_GENERATED_KEYS)
 (.prepareStatement (connection*) sql))]
(if return-keys
  (do
(doseq [param-group param-groups]
  (dorun (map-indexed (fn [index value]
(.setObject stmt (inc index) value))
  param-group)))
(transaction* (fn []
(.executeUpdate stmt)
(first (resultset-seq* (.getGeneratedKeys stmt))
  (do
(doseq [param-group param-groups]
  (dorun (map-indexed (fn [index value]
(.setObject stmt (inc index) value))
  param-group))
  (.addBatch stmt))
(transaction* (fn []
(let [rs (seq (.executeBatch stmt))]
  (if return-keys (first (resultset-seq* 
(.getGeneratedKeys stmt))) rs




 (with-connection db
(insert-record :temp {:parent (rand 42)}))
{:id 88, :parent 13}

 (with-connection db
(insert-records :temp {:parent (rand 42)} {:parent (rand 
42)}))
({:id 89, :parent 7} {:id 90, :parent 33})

 




This probably breaks something else though; I haven't tested ...

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Re: Applying Java functions

[Lars Rune Nøstdal]

Hi,

user (definline sqrt [x]
`(Math/sqrt ~x))
#'user/sqrt

user (map sqrt (range 1 10))
(1.0 1.4142135623730951 1.7320508075688772 2.0 2.23606797749979 
2.449489742783178 2.6457513110645907 2.8284271247461903 3.0)

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