#ocaml on 2017-12-27 — irc logs at freenode.irclog.whitequark.org

2017-11-24 19:05 adrien changed the topic of #ocaml to: Discussions about the OCaml programming language | http://www.ocaml.org | OCaml 4.06.0 release notes: https://caml.inria.fr/pub/distrib/ocaml-4.06/notes/Changes | Try OCaml in your browser: http://try.ocamlpro.com | Public channel logs at http://irclog.whitequark.org/ocaml

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09:08 <_xvilka_> hi!

09:08 <_xvilka_> I have an application which performs different kind of queries to PostgreSQL, and have functions like http://paste.debian.net/plainh/55346185

09:09 <_xvilka_> to prevent repetitive code, the only changing things are 1) sql query 2) processing of the tuple inside 3) returning the results

09:10 <_xvilka_> question is - how I can effectively extract the repetitive part and just change those things

09:11 <_xvilka_> it should return different types - sometimes it's a list, sometimes it's a tuple, sometimes is a variant or even more complex custom type

09:12 <_xvilka_> so basically something like 1) string for sql query 2) function for converting tuples into something 3) not sure how to return those results from 2nd step

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09:16 <_xvilka_> I'll be afk, but will check the answer tomorrow, if there will be one. Thank you

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10:14 <Drup> _xvilka_: it's difficult to answer you without code examples

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20:41 <argent_smith> aantron: does Lwt.join exit when one of the threads fails?

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21:01 <argent_smith> for instance here: https://pastebin.com/qBDr5Egi the program doesn't exit

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21:13 <argent_smith> looks lije join never fails

21:14 <argent_smith> *like

21:20 <argent_smith> hmm… it works on Linux

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21:20 <argent_smith> ant doesn't — on mac

21:20 <argent_smith> *and

21:20 <argent_smith> can we file an issue somewhere?

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21:51 <aantron> yep, Lwt issues are here https://github.com/ocsigen/lwt/issues, make a new one :)

21:51 <aantron> if one of the promises given to join is rejected, it should wait for all promises to resolve, then join rejects

21:51 <aantron> argent_smith: ^

21:52 <aantron> so the pasted programs should run forever, i believe

21:55 <aantron> btw the main Lwt module has some reference docs here https://ocsigen.github.io/lwt/manual-draft/Lwt.html#VALjoin

21:56 <aantron> but i just fixed a typo in the docs of join and clarified them a bit, https://github.com/ocsigen/lwt/commit/5c199368249481c5f67d838622ef5a7f75e18c10

21:57 <argent_smith> ah-ha, very interesting

21:57 <argent_smith> but when I compile the same code on Linux, it does fail immediately

21:57 <argent_smith> however…

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21:58 <argent_smith> I will make a test and file an issue then

21:59 <argent_smith> i've never done tests in OCaml yet ;)

22:01 <argent_smith> good manual btw, thank you

22:01 <argent_smith> aantron: ^

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22:26 <aantron> okay, that sounds good. let me know how it goes/open that issue. in irc, please mention my name, otherwise i might miss a message :)

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