Read sticky table of HA proxy from lua action

print_stk.lua

function dump_str(o)
    -- transform a table into a string for the printing.
    -- found it on google
    -- better to use print_r from here http://www.arpalert.org/haproxy-scripts.html
      if type(o) == 'table' then
          local s = '{ '
          for k,v in pairs(o) do
                  if type(k) ~= 'number' then k = '"'..k..'"' end
                  s = s .. '['..k..'] = ' .. dump_str(v) .. ','
          end
          return s .. '} '
      else
          return tostring(o)
      end
  end
  
  -- name of the sticky table we are lookgin for
  -- in the hapory.cfg something like
  -- backend per_auth_rates
  --   stick-table type string len 180 size 200k expire 60s store gpc1,http_req_rate(60s),conn_rate(60s)

  my_stk_name = 'per_auth_rates'
  
  function read_stk(txh)
      -- get the proxy, since we have to first get it and read it sticky
      my_stk = core.proxies[my_stk_name]
      -- get the sicky and use it's dump function. 
      -- in lua, functions of an object are called with : not . 
      -- thanks to Thierry Fournier
      core.Info(dump_str(my_stk.stktable:dump({})))
  end 
  
  core.register_action("read_stk", {'tcp-req', 'http-req'}, read_stk, 0);