os.getenv not work in custom plugin

[Alsmile]

handler.lua

function CtgLogHandler:log(conf)
  CtgLogHandler.super.log(self)

  --  os.getenv("PATH")  not work, eq nil
  ngx.log(ngx.DEBUG, "[ctg-log] env - path: ", os.getenv("PATH"))

  local ok, err = timer_at(0, log, conf, serializer.serialize(ngx))
  if not ok then
    ngx.log(ngx.ERR, "[ctg-log] could not create timer: ", err)
  end
end

I can not get my environment variables in handler.lua of custom plugin.

[jeremyjpj0916]

You need to add env PATH to your nginx.conf / Kong template file.

env PATH;

[thibaultcha]

Hi,

Indeed @jeremyjpj0916 is right, this is an expected behaviour from Nginx, which only adds declared environment variables to the worker processes environ variable.

BTW, better avoid calling such non JIT-able functions like os.getenv in hot-code paths and cache them somewhere instead (like the top-level chunk of your Lua module for example).