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  • Sep 22 12:01
    jottr closed #1444
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    hishamhm commented #1440
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    hishamhm commented #1441
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    hishamhm on master

    Fix badge in the README (compare)

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BONNAURE Olivier
@solisoft
Hi there, I'm trying to use lapis with openresty and all my rocks are in ~/.luarocks
but when I run lapis I have that :
~/.luarocks/bin/lapis serve
nginx: [alert] lua_code_cache is off; this will hurt performance in /Users/olivierbonnaure/workspace/fasty/nginx.conf.compiled:33
nginx: [error] init_by_lua error: init_by_lua:4: module 'ltn12' not found:
none of my rocks are available for openresty
OSX apple M1
Thijs Schreijer
@Tieske
@iThorgrim-Hub check the lua-mailing list archives. There are utilities that pack everything up into 1 executable file. An alternative, more dynamic, approach would be to ship laurocks with your application, have LuaRocks install everything in a tree within your app structure, and the use a "relative require" (Penlight has some stuff for that) to load the modules
@solisoft you need to update your LUA_PATH settings such that OpenResty looks in the right places. With OpenResty you can use: https://github.com/openresty/lua-nginx-module#lua_package_path to set it
Alex Guzun
@alexguzun

Hi there! Is everything ok with luarocks? Your build pipelines are failing with failures fetching rock files:
Example:
Error: Failed installing dependency: https://luarocks.org/kong-plugin-grpc-web-0.2.0-0.src.rock - Could not fetch rock file: Error fetching file: Failed downloading https://luarocks.org/kong-plugin-grpc-web-0.2.0-0.src.rock - kong-plugin-grpc-web-0.2.0-0.src.rock

The failing fetch is allways different

Thijs Schreijer
@Tieske
I noticed this too, usually with a "wantread" in the error message
solares
@solares
I'm trying to luarocks install http (on a dockerized Ubuntu), and it complains cqueues 20200726.54-0 depends on lua 5.4 (5.4-1 provided by VM). How can I satisfy lua 5.4 requirements? My docker image is 5.4.3, but reports 5.4-1. TIA anyone who can help.
Hisham Muhammad
@hishamhm
@solares is your installation failing? in other words, is it complaining that message or is it merely informing? :)
also, to anyone experience intermittent download failures, please make sure you upgrade to the latest LuaRocks 3.7.0, which has better handling of mirrors
solares
@solares
@hishamhm hello. It's failing. Final error is executor failed running [/bin/sh -c luarocks install http]: exit code: 1
Hisham Muhammad
@hishamhm
I don't think the depends on lua 5.4 message is the cause though, can you post the full output in a gist?
solares
@solares
> luarocks --version /usr/local/bin/luarocks 3.7.0
solares
@solares
@hishamhm
solares
@solares
Got past that bug. I added apt install m4 and apt install cqueues before luarocks install http.
Hisham Muhammad
@hishamhm
apt install cqueues shouldn't have been necessary, apt install m4 would have been sufficient
EduardasMeile
@EduardasMeile
@hishamhm Hello. Can you comment on the state of the Keplerproject codebase? I saw you had commits there. Me and my colleagues are using this stuff in production, but have concerns about things like WSAPI being dead projects.
solares
@solares

apt install cqueues shouldn't have been necessary, apt install m4 would have been sufficient

Thanks for the tip.

Hisham Muhammad
@hishamhm
@EduardasMeile some of the projects are indeed abandoned and looking for maintainers. I try to help out merging PRs and the like for projects for which I have commit access and some familiarity, but indeed there is no active development/roadmap for various of these projects.
Some orphaned Lua projects are now finding a new home at https://github.com/lunarmodules where a team of volunteers are helping to give a baseline of maintenance to them. Help is definitely welcome there! Also, if you're wondering about the status of any particular project in the keplerproject repo, I recommend opening an issue asking about it and seeing if you get a response (I don't know the exact status of each single project myself)
EduardasMeile
@EduardasMeile
@hishamhm Thank you for answering. Do you know if there is a reasonable replacement for WSAPI in the lua ecosystem that is actually being maintained? What is the preferred way of integrating a Lua web app with nginx (it does not support CGI natively)? The only way I got some WSAPI-based scripts to work with nginx is by using fcgiwrap and FastCGI. Perhaps you know of a better alternative?
Hisham Muhammad
@hishamhm
@EduardasMeile specifically about WSAPI, not that I'm aware of. I know that cgilua is used in production at PUC-Rio, so it continues to be maintained. As for alternatives, OpenResty is a currently-maintained package for running Lua+nginx (which includes its own nginx distribution), but it uses a different API, so your scripts would probably have to be ported over.
EduardasMeile
@EduardasMeile
@hishamhm Perhaps I am interpreting it wrong, but it really sounds like doing web apps specifically in Lua in 2021 is a bad idea?
We use Lua at my dayjob on embedded systems because of the small interpreter size and that is why WSAPI and such have been used historically.
but Xavante has no SSL support as far as I know
so we have recently started looking into a replacement
Hisham Muhammad
@hishamhm
OpenResty is actively maintained, and it's used in large projects such as Kong ( konghq.com ) — if your embedded system is big enough for nginx, it should be able to handle OpenResty.
EduardasMeile
@EduardasMeile
@hishamhm Isn't OpenResty more about extending nginx and making the webserver itself scriptable rather than writing more general Lua web apps?
Hisham Muhammad
@hishamhm
from what I can tell, it isn't lower level than WSAPI...
looks like there was even a bridge once: https://github.com/ignacio/wsapi-openresty
EduardasMeile
@EduardasMeile
unlike regular nginx that has a bitbake recipe, I'd need to make this cross-compile myself somehow, which might turn out to be a non-trivial task
a lot of projects do not support cross-compilation properly (nginx included) and need to be patched
also, as a sidenote, after porting some Lua libraries to Yocto/Openembedded (writing bitbake recipes for them) I have become convinced that almost all Lua projects do not care about cross-compilation. All of their custom make files need to fixed in one way or another.
Things like the WSAPI configure file wants to run "which lua" that is not appropriate in a cross-compilation context
and so on
much of this could be avoided if projects used GNU Autotools or CMake instead of custom Makefiles
as these encourage to write projects in a manner that suits cross-compilation better
EduardasMeile
@EduardasMeile
though at the end of the day one can always mess up, no matter the build system
@hishamhm just out of curiosity: has cross-compilation ever come up as a topic when developing Luarocks?
Hisham Muhammad
@hishamhm
@EduardasMeile yes, that's one of the reasons why there are dozens of configuration variables in LuaRocks's config file format and virtually every setting is a moving part. The dependencies for the luarocks.exe binary for Windows are built using LuaRocks on a Linux machine, for example. The capability is there, it's just not user-friendly (you have to know what values to set on those configuration variables).
EduardasMeile
@EduardasMeile
@hishamhm What would be your ideal webserver + lua web framework combination for implementing a web app on an embedded Linux device these days?
Excluding LuCI + uhttpd on OpenWrt as that is too OS-specific
I am kind of thinking now that perhaps nginx might not have been a good choice for a Xavante replacement if one wants to still use lua
Hisham Muhammad
@hishamhm
asking the wrong person, sorry. I haven't done web apps in a long long time
EduardasMeile
@EduardasMeile
@hishamhm perhaps you know a lua web app guru who is an authority in this field and I could actually ask?
Hisham Muhammad
@hishamhm
try the Lua mailing list, perhaps?
EduardasMeile
@EduardasMeile
@hishamhm as a sidenote, I have spent some time on the #lua channel on freenode and as far as I can tell no one is really working with lua web apps or WSAPI these days
or the people working with this stuff maintain legacy applications and don't really participate in community discussions