Importing libraries/modules in custom plugins?

[0xdeadbeer]

Is it possible? I am in the middle of writing an ActiveMQ logger that uses the AMQP protocol and have to include the amqp-client LuaRocks module like so:

...
local http            = require("resty.http")
local url             = require("net.url")
local amqp            = require("amqp-client")

local tostring = tostring
...

I installed the module on my Apisix host with luarocks install amqp-client.
However, Apisix still gives me trouble:

2024/08/06 11:34:59 [error] 200037#200037: *67571 [lua] plugin.lua:138: load_plugin(): failed to load plugin [amqp-logger] err: ...kevinj/src/custom-plugins/apisix/plugins/amqp-logger.lua:23: module 'amqp-client' not found:
	no field package.preload['amqp-client']
	no file '/home/kevinj/src/custom-plugins/amqp-client.lua'
	no file '/home/kevinj/src/apisix-3.9.1//deps/share/lua/5.1/amqp-client.lua'
	no file '/home/kevinj/src/apisix-3.9.1//deps/share/lua/5.1/amqp-client/init.lua'
	no file '/home/kevinj/src/apisix-3.9.1/amqp-client.lua'
	no file '/home/kevinj/src/apisix-3.9.1/amqp-client/init.lua'
	no file '/usr/local/openresty/site/lualib/amqp-client.ljbc'
	no file '/usr/local/openresty/site/lualib/amqp-client/init.ljbc'
	no file '/usr/local/openresty/lualib/amqp-client.ljbc'
	no file '/usr/local/openresty/lualib/amqp-client/init.ljbc'
	no file '/usr/local/openresty/site/lualib/amqp-client.lua'
	no file '/usr/local/openresty/site/lualib/amqp-client/init.lua'
	no file '/usr/local/openresty/lualib/amqp-client.lua'
	no file '/usr/local/openresty/lualib/amqp-client/init.lua'
	no file './amqp-client.lua'
	no file '/usr/local/openresty/luajit/share/luajit-2.1/amqp-client.lua'
	no file '/usr/local/share/lua/5.1/amqp-client.lua'
	no file '/usr/local/share/lua/5.1/amqp-client/init.lua'
	no file '/usr/local/openresty/luajit/share/lua/5.1/amqp-client.lua'
	no file '/usr/local/openresty/luajit/share/lua/5.1/amqp-client/init.lua'
	no file './amqp-client.lua'
	no file '/usr/local/openresty/luajit/share/luajit-2.1/amqp-client.lua'
	no file '/usr/local/share/lua/5.1/amqp-client.lua'
	no file '/usr/local/share/lua/5.1/amqp-client/init.lua'
	no file '/usr/local/openresty/luajit/share/lua/5.1/amqp-client.lua'
	no file '/usr/local/openresty/luajit/share/lua/5.1/amqp-client/init.lua'
	no file '/usr/local/openresty/site/lualib/amqp-client.ljbc'
	no file '/usr/local/openresty/site/lualib/amqp-client/init.ljbc'
	no file '/usr/local/openresty/lualib/amqp-client.ljbc'
	no file '/usr/local/openresty/lualib/amqp-client/init.ljbc'
	no file '/usr/local/openresty/site/lualib/amqp-client.lua'
	no file '/usr/local/openresty/site/lualib/amqp-client/init.lua'
	no file '/usr/local/openresty/lualib/amqp-client.lua'
	no file '/usr/local/openresty/lualib/amqp-client/init.lua'
	no file './amqp-client.lua'
	no file '/usr/local/openresty/luajit/share/luajit-2.1/amqp-client.lua'
	no file '/usr/local/share/lua/5.1/amqp-client.lua'
	no file '/usr/local/share/lua/5.1/amqp-client/init.lua'
	no file '/usr/local/openresty/luajit/share/lua/5.1/amqp-client.lua'
	no file '/usr/local/openresty/luajit/share/lua/5.1/amqp-client/init.lua'
	no file '/home/kevinj/src/apisix-3.9.1//deps/lib64/lua/5.1/amqp-client.so'
	no file '/home/kevinj/src/apisix-3.9.1//deps/lib/lua/5.1/amqp-client.so'
	no file '/usr/local/openresty/site/lualib/amqp-client.so'
	no file '/usr/local/openresty/lualib/amqp-client.so'
	no file './amqp-client.so'
	no file '/usr/local/lib/lua/5.1/amqp-client.so'
	no file '/usr/local/openresty/luajit/lib/lua/5.1/amqp-client.so'
	no file '/usr/local/lib/lua/5.1/loadall.so'
	no file './amqp-client.so'
	no file '/usr/local/lib/lua/5.1/amqp-client.so'
	no file '/usr/local/openresty/luajit/lib/lua/5.1/amqp-client.so'
	no file '/usr/local/lib/lua/5.1/loadall.so', context: init_worker_by_lua*

Any ideas how I can go about solving this?

[0xdeadbeer]

I solved it by installing the package into the tree directory of Apisix's installation - make sure the deps folder exists.

# check if amqp-client is installed 
luarocks list --tree=/home/kevinj/src/apisix/deps | grep amqp-client
# no result - not installed yet 

# we install it with: 
luarocks --tree=/home/kevinj/src/apisix/deps install amqp-client

# check again 
luarocks list --tree=/home/kevinj/src/apisix/deps | grep amqp-client
# output: amqp-client

And corrected the import statement - according to the documentation of the module:

...
local http            = require("resty.http")
local url             = require("net.url")
local amqp            = require("amqp")

local tostring = tostring
...