# Lua packages not working with Haproxy

**URL:** <https://discourse.haproxy.org/t/lua-packages-not-working-with-haproxy/8013>\
**Category:** Lua Scripts\
**Created:** [October 11, 2022, 3:36pm UTC](https://discourse.haproxy.org/t/lua-packages-not-working-with-haproxy/8013 "2022-10-11T15:36:41Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Latika](https://avatars.discourse-cdn.com/v4/letter/l/9f8e36/32.png) [@Latika](https://discourse.haproxy.org/u/Latika)\
**Post date:** [October 11, 2022, 3:36pm UTC](https://discourse.haproxy.org/t/lua-packages-not-working-with-haproxy/8013/1 "2022-10-11T15:36:41Z")

</div>

Hi folks,

I’m new to Lua. Trying to use a Lua script in integration with Haproxy.  
We are trying to create a setup in which we want to conduct authorization of an incoming request at haproxy level before sending it to the application , for authorization we will use an external application which will be called from haproxy itself. If the result is true then we will further send the request to the application else we will reject it.  
Here we have created a test scenario, on the basis of true/false value from lua function, it should redirect to the respective backend in haproxy.  
If we run lua script separately for the boolean value then it’s returning the correct value but it is giving an error on running using Haproxy.

\<—Haproxy.cfg—\>  
global  
log /dev/log local0 debug  
log /dev/log local1 notice  
chroot /var/lib/haproxy  
stats socket /run/haproxy/admin.sock mode 660 level admin expose-fd listeners  
stats timeout 30s  
user haproxy  
group haproxy  
daemon  
#lua file load  
lua-load /etc/haproxy/test.lua  
# Default SSL material locations  
ca-base /etc/ssl/certs  
crt-base /etc/ssl/private  
# Default ciphers to use on SSL-enabled listening sockets.  
# For more information, see ciphers(1SSL). This list is from:  
# [Hardening Your Web Server’s SSL Ciphers](https://hynek.me/articles/hardening-your-web-servers-ssl-ciphers/)  
# An alternative list with additional directives can be obtained from  
# [Redirecting to ssl-config.mozilla.org...](https://mozilla.github.io/server-side-tls/ssl-config-generator/?server=haproxy)  
ssl-default-bind-ciphers ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:RSA+AESGCM:RSA+AES:!aNULL:!MD5:!DSS  
ssl-default-bind-options no-sslv3

defaults  
log global  
mode http  
option httplog  
option dontlognull  
timeout connect 5000  
timeout client 50000  
timeout server 50000

#frontend stats  
#bind \*:8404  
#stats enable  
#stats uri /  
#stats refresh 10s

frontend myfrontend  
bind \*:80  
mode http  
use\_backend %[lua.validation\_fetch]  
#http-request use-service lua.validation\_fetch  
default\_backend failure

backend web1  
mode http  
balance roundrobin  
option forwardfor  
server app\_1 [testapp.maropost.com:81](http://testapp.maropost.com:81) check

backend failure  
errorfile 403 /etc/haproxy/errors/403.http

\<—test.lua----\>  
local json = require’json’  
local http = require “socket.http”  
local http\_request = require “http.request”  
–local cURL = require(“cURL”)

core.register\_fetches(“validation\_fetch”, function()  
local call\_value = call\_result()  
if call\_value == true then  
return “web1”  
else  
return “failure”  
end  
end)

function call\_result()  
local headers, stream = assert(http\_request.new\_from\_uri(“[http://localhost:4567/auth?url=testapp.maropost.com](http://localhost:4567/auth?url=testapp.maropost.com)”):go())  
local body = assert(stream:get\_body\_as\_string())  
local value = json.decode(body).boolean  
return value  
end

\<–Error–\>  
[NOTICE] (3615) : haproxy version is 2.4.0-6cbbecf0973  
[NOTICE] (3615) : path to executable is /usr/local/sbin/haproxy  
[ALERT] (3615) : Lua sample-fetch ‘validation\_fetch’: [state-id 0] runtime error: /etc/haproxy/test.lua:18: No such file or directory from [C]: in global ‘assert’, /etc/haproxy/test.lua:18: in global ‘call\_result’, /etc/haproxy/test.lua:7: in function line 6.  
00000000:failure.clicls[0008:ffffffff]  
00000000:failure.closed[0008:ffffffff]

\<–Versions–\>  
[root@lua haproxy]# luarocks --version  
/usr/local/bin/luarocks 3.9.1  
LuaRocks main command-line interface  
[root@lua haproxy]# lua -v  
Lua 5.3.5 Copyright (C) 1994-2018 [Lua.org](http://Lua.org), PUC-Rio  
[root@lua haproxy]# haproxy -vv | grep Lua  
Built with Lua version : Lua 5.3.5

Any help would be highly appreciated!!  
Thanks!