ingress-nginx-helm/rootfs/etc/nginx/lua/balancer/round_robin.lua

local balancer_resty = require("balancer.resty")
local resty_roundrobin = require("resty.roundrobin")
local util = require("util")

local setmetatable = setmetatable

local _M = balancer_resty:new({ factory = resty_roundrobin, name = "round_robin" })

function _M.new(self, backend)
  local nodes = util.get_nodes(backend.endpoints)
  local o = {
    instance = self.factory:new(nodes),
    traffic_shaping_policy = backend.trafficShapingPolicy,
    alternative_backends = backend.alternativeBackends,
  }
  setmetatable(o, self)
  self.__index = self
  return o
end

function _M.balance(self)
  return self.instance:find()
end

return _M