openresty + lua 这个地方怎么写

lua-resty-upstream-healthcheck lua-resty-balancer

这两个插件是负载均衡和健康检测。组合到一块我不知道怎么写了。

    upstream webserver {
        server 127.0.0.1:12354;
        server 127.0.0.1:12355;
        server 127.0.0.1:12356 backup;
    }
    
  upstream webserver {
        server 127.0.0.1;
        balancer_by_lua_block {
            local b = require "ngx.balancer"
            local swrr_up = package.loaded.my_swrr_up

            -- Note that SWRR picks the first server randomly
            local server = swrr_up:find()
            assert(b.set_current_peer(server))
        }
   }