[GitHub] [apisix] downtown12 commented on issue #9280: help request: Can't import the built-in plugin `prometheus`, and error.log says 'exporter' is a number value

["downtown12 (via GitHub)" <gi...@apache.org>]

downtown12 commented on issue #9280:
URL: https://github.com/apache/apisix/issues/9280#issuecomment-1501732447

   Problem solved.
   The reason is a mistaken sequence I made, which cause LuaJIT choosing lua_package_path not as desire
   
   `/apisix-3.2.0/apisix/plugins/prometheus.lua:39: attempt to index local 'exporter' (a number value)`
   
   The reason of the error log above is that I add a `lua_extra_path` config to my `conf/config.yaml` file, which is:
   `extra_lua_path: "/chj/apisix-3.2.0/apisix/plugins/?.lua"`
   
   then when APISIX running, the `lua_package_path` becomes:
   `/chj/apisix-3.2.0/apisix/plugins/?.lua;/chj/apisix-3.2.0//deps/share/lua/5.1/?.lua;/chj/apisix-3.2.0//deps/share/lua/5.1/?/init.lua;...`
   
   so as the error stack shows, `apisix/plugins/prometheus/exporter.lua:20` tries to find the `prometheus` module.
   The lua-land will firstly try to find it in `/chj/apisix-3.2.0/apisix/plugins/?.lua`(the left head of `lua_package_path`), then `/chj/apisix-3.2.0//deps/share/lua/5.1/?.lua`.
   
   lua-land will hit `/chj/apisix-3.2.0/apisix/plugins/prometheus.lua` then use it. But the real file the `exporter.lua` wanna to find is `/chj/apisix-3.2.0//deps/share/lua/5.1/prometheus.lua`(The behind but the RIGHT module)...
   


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