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clojurians | clojure | Have better debugging tools? I need parse multi-layer json object, it’s very easy wrong, I use Idea IntelliJ tool. | 2017-12-05T21:29:09.000103 | Lisabeth |
clojurians | clojure | <@Lisabeth> Can you be a bit more specific about what you're stuck on? Are you using Cheshire to parse the JSON? | 2017-12-05T22:25:37.000012 | Daniell |
clojurians | clojure | what's `form`? | 2017-12-05T23:14:10.000043 | Kristy |
clojurians | clojure | in the source I can see it serves some internal `Specize` protocol. still confused | 2017-12-05T23:14:39.000181 | Kristy |
clojurians | clojure | it’s a literal form to use when reporting failures in lieu of the normal form of the spec | 2017-12-05T23:23:24.000076 | Sonny |
clojurians | clojure | typically would not be something you would use as a user (which is why it’s not doc’ed I think) | 2017-12-05T23:23:49.000056 | Sonny |
clojurians | clojure | I think it may actually be vestigial at this point | 2017-12-05T23:27:33.000021 | Sonny |
clojurians | clojure | I don’t think it’s either called or does anything useful now? | 2017-12-05T23:31:45.000007 | Sonny |
clojurians | clojure | thanks for the input <@Sonny>!
funny, I was implementing something similar right now, a `check-with-explanation-value` helper | 2017-12-05T23:34:15.000059 | Kristy |
clojurians | clojure | use case:
`{:post [(check-with-explanation-value some? % coll)]}` | 2017-12-05T23:34:44.000102 | Kristy |
clojurians | clojure | because `some? nil` cannot give useful information, so we use `coll` (a defn argument) as the explanation value | 2017-12-05T23:35:27.000039 | Kristy |
clojurians | clojure | there’s a ticket with a patch for something like that if it’s useful to you | 2017-12-05T23:52:10.000095 | Sonny |
clojurians | clojure | actually, I guess it isn’t what you want, nvm | 2017-12-05T23:53:54.000153 | Sonny |
clojurians | clojure | <@Lisabeth>
>Have better debugging tools? I need parse multi-layer json object, it’s very easy wrong, I use Idea IntelliJ tool.
Why current Intellij tools are not enough? I use CIDER debug and it's good enough so far (it shows values of all expressions starting from inside ones). | 2017-12-06T01:39:46.000145 | Heriberto |
clojurians | clojure | Hi, I have a problem with my clojure backend project. When my project starts `jetty` server, the whole nginx on this linux, including static resources which are out of the clojure project, starts to slows down for accessing. It shows a long orange `Initial connection` time in Chrome. What can this kind of problem be? Thanks! | 2017-12-06T03:09:53.000032 | Tari |
clojurians | clojure | <@Tari> do you see some high resource usage on your system (CPU, RAM, IO) ? | 2017-12-06T03:34:33.000213 | Jami |
clojurians | clojure | no | 2017-12-06T03:34:49.000316 | Tari |
clojurians | clojure | I used `# netstat -anpl | wc -l` to see tcp connections. some 300-500 counts. | 2017-12-06T03:35:33.000028 | Tari |
clojurians | clojure | ```
# uptime
16:36:34 up 474 days, 1:13, 7 users, load average: 2.71, 1.92, 2.17
``` | 2017-12-06T03:36:48.000138 | Tari |
clojurians | clojure | and something like this:
```
# top
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
11450 works 20 0 1627m 498m 14m R 98.9 3.1 2:14.78 grunt
4035 works 20 0 6748m 1.7g 16m S 88.3 11.2 13:44.59 java
```
but it seems natural in my server. we have 4 cpu cores. | 2017-12-06T03:37:56.000138 | Tari |
clojurians | clojure | is is a shared or a dedicated server ? | 2017-12-06T03:38:50.000270 | Jami |
clojurians | clojure | It is a cloud server. <https://www.aliyun.com/> | 2017-12-06T03:39:37.000017 | Tari |
clojurians | clojure | can you run sudo iotop -a on your server ? | 2017-12-06T03:44:19.000218 | Jami |
clojurians | clojure | yep | 2017-12-06T03:44:35.000192 | Tari |
clojurians | clojure | maybe the two processes compete for the IO resources, otherwise I don't see why they would slow down each other | 2017-12-06T03:45:03.000300 | Jami |
clojurians | clojure | you can also do a curl from the server (localhost) to see if it is slow as well | 2017-12-06T03:45:49.000243 | Jami |
clojurians | clojure | we run ssh between cloud servers and it is fast. Only when we do remote ssh, or access https service in browsers, it is slow. | 2017-12-06T03:47:02.000175 | Tari |
clojurians | clojure | and if we stop the clojure(java) process that runs `jetty`, it recovers. | 2017-12-06T03:47:46.000003 | Tari |
clojurians | clojure | Does that mean `jetty` do a lot of io that slows down the server? | 2017-12-06T03:48:48.000142 | Tari |
clojurians | clojure | it can be jetty or the JVM. One of them can take too much memory/IO and exceed your cloud provider quotas | 2017-12-06T03:57:15.000002 | Jami |
clojurians | clojure | try to use an alternative to see if it changes something: <https://github.com/ztellman/aleph> <http://www.http-kit.org/> | 2017-12-06T03:57:58.000462 | Jami |
clojurians | clojure | if you use ring/compojure, they can be used as drop-out replacements | 2017-12-06T03:58:13.000224 | Jami |
clojurians | clojure | <@Jami> Thank you very much. | 2017-12-06T04:08:37.000054 | Tari |
clojurians | clojure | In my project
`ring-middleware-format:jar:0.7.2` imports `org.clojure:tools.reader:jar:1.0.5`
And
`immutant:jar:2.1.9`'s dependency tries to import `org.clojure:tools.reader:jar:0.10.0` which is omitted for conflict
What to do in such situation? Can bad things happen due to omit of this dependency? | 2017-12-06T06:22:32.000365 | Marcos |
clojurians | clojure | <@Marcos> There's very little you can do. The bad thing that can happen, will only happen is tools.reader changes it's API between 0.10 and 1.0.5. Rich has firmly committed to not breaking APIs, ever. And I suspect org.clojure/tools.reader will follow this pattern. | 2017-12-06T06:43:05.000183 | Jodie |
clojurians | clojure | <@Jodie>, thanks! | 2017-12-06T06:44:42.000391 | Marcos |
clojurians | clojure | Okay, also. In project I have dependency `[clj-time "0.14.2"]` and `ring:ring:jar:1.6.3` want `clj-time:clj-time:jar:0.11.0`. what to do here? I should use `clj-time 0.11.0`? | 2017-12-06T06:54:27.000331 | Marcos |
clojurians | clojure | <@Marcos> I _personally_ tend to use latest as much as possible. I've not had an issue doing this. | 2017-12-06T07:04:19.000157 | Jodie |
clojurians | clojure | <@Marcos> whatever works - i tend to try the later dependency first and exclude the earlier on the presumption that the later version will have bugfixes, but occasionally you have to do it the other way around and occasionally you are stuffed and have to go make PRs for some of your dependencies | 2017-12-06T07:04:26.000131 | Shameka |
clojurians | clojure | But I think, what there maybe api changes between 0.14.2 and 0.11.0 versions. | 2017-12-06T07:05:49.000268 | Marcos |
clojurians | clojure | Here is clj-time changelog <https://github.com/clj-time/clj-time/blob/master/ChangeLog.md>
I didnt see any api change mentions | 2017-12-06T07:06:46.000295 | Marcos |
clojurians | clojure | So Ill use 0.14.2 | 2017-12-06T07:06:58.000105 | Marcos |
clojurians | clojure | Thanks, <@Shameka> <@Jodie> | 2017-12-06T07:08:10.000160 | Marcos |
clojurians | clojure | I need process it, eg:add avg etc... Probably because I have just started. Thanks for you’re help, I have solved the problem, and I known the Cheshire project.:+1: | 2017-12-06T07:22:14.000075 | Lisabeth |
clojurians | clojure | hello, does anybody here is aware of a currently maintained libray like prismatic.plumbing (specially its graph related facilities) ? | 2017-12-06T07:36:13.000030 | Isabell |
clojurians | clojure | <@Isabell> you have <https://github.com/aysylu/loom> and <https://github.com/Engelberg/ubergraph> | 2017-12-06T07:41:29.000277 | Jami |
clojurians | clojure | <@Jami> thank you! i will look at those | 2017-12-06T07:42:12.000312 | Isabell |
clojurians | clojure | Can anyone recommend a Clojure library for calling into an external C library? | 2017-12-06T08:47:54.000499 | Jone |
clojurians | clojure | Clojure can use Java JNI to call native code | 2017-12-06T09:31:02.000075 | Sonny |
clojurians | clojure | So there are quite a few a ways to approach writing more reliable, evolvable software.
* specifications: schema, spec
* doc enhancers like literate programming (marginalia) and interactive viewers (klipse, Dynadoc)
I think each has a set of trade offs. Has anyone written about this subject at a meta level. I think spec does a great job of allowing a user to add more reliability as it becomes more important. But i think growing software has to do with building a human narrative about a system, which, i think is worth creating non code documentation to create. I would like to see a tool which creates a narrative about a system, and can leverage existing ways of communicating: spec, unit tests, doc strings… and also grow and be viewed in different ways as the system evolves. Does anyone know of anyone interested in this, or any works on this subject? | 2017-12-06T09:55:37.000558 | Glory |
clojurians | clojure | <@Jone> I'd recommend JNA, it's super seamless with Clojure | 2017-12-06T10:12:13.000486 | Sandy |
clojurians | clojure | (.invoke (Library/getFunction "libc" "sin") [0.42]) | 2017-12-06T10:12:55.000381 | Sandy |
clojurians | clojure | That's about the extent of the psudeocode you need with JNA | 2017-12-06T10:13:06.000335 | Sandy |
clojurians | clojure | jni is much faster tho (last time I used it, few years back) | 2017-12-06T10:14:01.000233 | Weston |
clojurians | clojure | <@Weston> define "much faster" :slightly_smiling_face: | 2017-12-06T10:15:39.000432 | Sandy |
clojurians | clojure | in my case it was an order of magnitude faster | 2017-12-06T10:16:00.000230 | Weston |
clojurians | clojure | I was interacting with a lib related to rf cavity simulation, so quite fast internally | 2017-12-06T10:16:41.000476 | Weston |
clojurians | clojure | As always the problem is:
* JNA gives you almost instant access to C libs a a slight perf cost (we're talking about 10x slower over the cost of a function call, that's not much)
* JNI gives you near native function call speeds, but you have to write/generate/maintain a wrapper and all the associated build code | 2017-12-06T10:18:19.000363 | Sandy |
clojurians | clojure | but jni requires more ceremony for sure, I had to write some java on the side and then call from clojure | 2017-12-06T10:18:21.000019 | Weston |
clojurians | clojure | exactly as you said | 2017-12-06T10:18:37.000023 | Weston |
clojurians | clojure | not sure what you mean about the build code, a simple lein file was good enough, I had the java wrapper and the clojure code living in the same project, with the .dll (windows... *sigh*) in question (I guess it works the same with .so files) | 2017-12-06T10:21:50.000876 | Weston |
clojurians | clojure | <@Sonny> Thank you. I was hoping for a more painless way though as I am going to use a C/C++ library with a lot of functions. I already started wrapping it in C, Java and Clojure but it is not much fun.
<@Sandy> Thank you for the suggestion. I guess that is as good as it gets right now in the general case. Could not find any maintained pure Clojure libraries. I am actually the author of clj-native and the bits in Leiningen that link native libraries into projects. But I abandoned that years ago because I stopped doing Clojure development and now I don’t like that declarative approach any more so I am not going to revive it.
For my particular need though (LLVM) I did find this, which seems to work out of the box with Clojure. Very nice! <https://github.com/bytedeco/javacpp-presets/tree/master/llvm> | 2017-12-06T10:26:09.000780 | Jone |
clojurians | clojure | I've used JNR successfully, and it claims to be close to JNI, but still high-level. | 2017-12-06T10:50:58.000125 | Guillermo |
clojurians | clojure | When using the new `clojure` cli tool, is there a way to pick a clojure version from the command line? | 2017-12-06T11:04:00.000392 | Fe |
clojurians | clojure | Using a `deps.edn` with `{:deps {org.clojure/clojure {:mvn/version "1.9.0-RC2"}}}` works, but I'm wondering if there's a cli switch | 2017-12-06T11:04:25.000542 | Fe |
clojurians | clojure | you can use aliases in deps.edn and then pick which clj version to use by picking a different alias | 2017-12-06T11:05:12.000617 | Kareen |
clojurians | clojure | <@Kareen> but no way to pick the clojure version from the command line *without* a deps.edn? | 2017-12-06T11:32:41.000224 | Fe |
clojurians | clojure | what do you mean? | 2017-12-06T11:32:56.000657 | Kareen |
clojurians | clojure | no | 2017-12-06T11:32:57.000612 | Kareen |
clojurians | clojure | sorry | 2017-12-06T11:32:58.000843 | Fe |
clojurians | clojure | not without | 2017-12-06T11:33:00.000025 | Kareen |
clojurians | clojure | afaik | 2017-12-06T11:33:04.000042 | Kareen |
clojurians | clojure | I think that would be a useful feature (boot can do it) | 2017-12-06T11:33:15.000115 | Fe |
clojurians | clojure | especially given the intended use case of playing around with code from the repl | 2017-12-06T11:33:37.000278 | Fe |
clojurians | clojure | which version does it pick anyway - is it hardcoded to 1.8.0? | 2017-12-06T11:33:57.000285 | Fe |
clojurians | clojure | yes | 2017-12-06T11:34:42.000675 | Kareen |
clojurians | clojure | no | 2017-12-06T11:36:27.000422 | Sonny |
clojurians | clojure | nothing is hardcoded | 2017-12-06T11:36:35.000389 | Sonny |
clojurians | clojure | please see the reference page for more details <https://clojure.org/reference/deps_and_cli> | 2017-12-06T11:36:57.000069 | Sonny |
clojurians | clojure | there are a series of configuration files that are combined - the default is defined in the installation deps.edn | 2017-12-06T11:37:18.000202 | Sonny |
clojurians | clojure | if you wanted to, you could define a set of aliases in your config-level deps.edn (usually in ~/.clojure/deps.edn) - then you could use them from anywhere by specifying them at the command line | 2017-12-06T11:39:31.000221 | Sonny |
clojurians | clojure | ```{:aliases {
:1.7 {:override-deps {org.clojure/clojure "1.7.0"}}
:1.8 {:override-deps {org.clojure/clojure "1.8.0"}}
:1.9 {:override-deps {org.clojure/clojure "1.9.0-RC2"}}
}}``` | 2017-12-06T11:40:33.000503 | Sonny |
clojurians | clojure | then do `clj -R:1.7` / `clj -R:1.8` / `clj -R:1.9` | 2017-12-06T11:41:00.000469 | Sonny |
clojurians | clojure | or I guess, nothing is hardcoded *in the tool*. The installation files do hardcode the default version. | 2017-12-06T11:41:59.000907 | Sonny |
clojurians | clojure | also btw, there is a <#C6QH853H8|tools-deps> room where I watch for questions on this stuff | 2017-12-06T11:42:24.000373 | Sonny |
clojurians | clojure | <@Sonny> cool, I'll move it over there then | 2017-12-06T11:42:56.000015 | Fe |
clojurians | clojure | <http://clojurians-log.clojureverse.org|clojurians-log.clojureverse.org> seems to have stopped logging about a month (2017-11-16) ago. Is this expected? | 2017-12-06T12:58:02.000110 | Domingo |
clojurians | clojure | <@Jasmine> is the person to ask about that I believe? | 2017-12-06T14:12:52.000671 | Daniell |
clojurians | clojure | <@Crystal> instrument's argument needs backtick not single quote | 2017-12-06T14:18:08.000373 | Guillermo |
clojurians | clojure | That way you are instrumenting user/myinc not myinc | 2017-12-06T14:19:15.000629 | Guillermo |
clojurians | clojure | ```
`myinc not 'myinc
``` | 2017-12-06T14:20:05.000458 | Guillermo |
clojurians | clojure | oh, didn't know that. But tried now by reloading the whole code in the REPL with backtick, still no instrumentation... | 2017-12-06T14:25:22.000026 | Crystal |
clojurians | clojure | (st/instrument `myinc) | 2017-12-06T14:25:34.000509 | Crystal |
clojurians | clojure | I must be doing some silly basic mistake, since I'm the only one having this problem :slightly_smiling_face: | 2017-12-06T14:26:14.000205 | Crystal |
clojurians | clojure | The return value from instrument is `[]`, is that correct? | 2017-12-06T14:27:48.000390 | Crystal |
clojurians | clojure | I think I figured it out now, the backtick was the solution, I just had some issues referencing vars correctly in repl ns. Thanks so much, <@Guillermo>! | 2017-12-06T15:01:56.000143 | Crystal |
clojurians | clojure | Wow, that is troubling. Does anyone know who maintains that? | 2017-12-06T16:29:09.000243 | Cecile |
clojurians | clojure | this seems true in practice, but is it guaranteed that the `name` function, when applied to a qualified keyword, always strips off the namespace, so that (name ::foo/bar) is always equiv to (name :bar) and always equiv to "bar" ? | 2017-12-06T16:34:37.000381 | Berry |
clojurians | clojure | <@Berry> Given the docstrings for `name` and `keyword`, I'd say yes... | 2017-12-06T16:36:40.000559 | Daniell |
clojurians | clojure | ```clojure.core/name
([x])
Returns the name String of a string, symbol or keyword.
clojure.core/keyword
([name] [ns name])
Returns a Keyword with the given namespace and name. Do not use :
in the keyword strings, it will be added automatically.``` | 2017-12-06T16:37:09.000413 | Daniell |
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