no new() function in random.lua,which is balancer plugin require

[liulei18]

Version

v0.7.0

Description

to archive dynamic upstream

Plugin

balancer plugin & divide plugin

Configuration

• the configuration as same as 安装和使用文档可参考Orange Balancer 安装及使用 ,this is the guide doc in orange/orange/plugins/balancer/README.md

• nginx.conf

  upstream hello {
  server 127.0.0.1;
  balancer_by_lua_block {
      local orange = context.orange
      orange.balancer()
  }
  }
  
  # test server 1
  server {
      listen 8881;
  
      location / {
          content_by_lua_block {
              ngx.say("8881")
          }
      }
  }
  
  # test server 2
  server {
      listen 8882;
  
      location / {
          content_by_lua_block {
              ngx.say("8882")
          }
      }
  }
  
  # test server 3
  server {
      listen 8883;
  
      location / {
          content_by_lua_block {
              ngx.say("8883")
          }
      }
  }
  
  server {
      listen 80;
  
      location /balancer {
              rewrite_by_lua_block {
                      local orange = context.orange
                      orange.redirect()
                      orange.rewrite()
              }
  
              access_by_lua_block {
                      local orange = context.orange
                      orange.access()
              }
  
              # proxy
              proxy_set_header Upgrade $http_upgrade;
              proxy_set_header Connection $connection_upgrade;
              proxy_set_header X-Real-IP $remote_addr;
              proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
              proxy_set_header X-Forwarded-Scheme $scheme;
              proxy_pass $upstream_url;
  
              header_filter_by_lua_block {
                      local orange = context.orange
                      orange.header_filter()
              }
  
              body_filter_by_lua_block {
                      local orange = context.orange
                      orange.body_filter()
              }
              log_by_lua_block {
                      local orange = context.orange
                      orange.log()
              }
      }
  }

• balancer

• divide

Execute

• curl 'http://ip:port/balancer'

Error Log

2019/07/16 16:48:14 [error] 389667#0: *20 lua entry thread aborted: runtime error: ./lualib/resty/dns/balancer.lua:1027: attempt to call field 'new' (a nil value)
stack traceback:
coroutine 0:
    ./lualib/resty/dns/balancer.lua: in function 'randomlist'
    ./lualib/resty/dns/balancer.lua:1129: in function 'new'
    /usr/local/orange/orange/utils/balancer.lua:145: in function 'get_balancer'
    /usr/local/orange/orange/utils/balancer.lua:241: in function 'balancer_execute'
    /usr/local/orange/orange/plugins/balancer/handler.lua:95: in function 'access'
    /usr/local/orange/orange/orange.lua:166: in function 'access'
    access_by_lua(orange.conf:669):3: in function <access_by_lua(orange.conf:669):1>, client: 192.168.90.26, server: orange.com, request: "GET /balancer HTTP/1.1", host: "orange.com"

Solution

• I install third-party packages as required according to README.md like this

  #opm --install-dir=./ get zhangbao0325/orangelib      //opm download the 3rd packages

• i read the source code in lualib/resty/dns/balancer.lua

  local lrandom = require "random"
  local function randomlist(size)
  xxxx
  ........
  local randomizer = lrandom.new(158841259)
  ........
  xxxx
  end

• According to the error log, i find the reason. according to above order installs package has a problem in lualib/resty/random.lua, no new() function in random.lua

• where can i find correct random.lua file,can you give me some suggestion? hope for your answer. thanks @zhangbao0325 @zhjwpku

[liulei18]

• balancer plugin is dependent on lua-resty-dns-client libary. and this isssue has solved by @Tieske,the contributor of Kong.
• here are the steps to solve the problem 1 rm the file /usr/local/orange/lualib/resty/random.lua. random.lua is downloaded by opm --install-dir=./ get zhangbao0325/orangelib 2 Install dependencies by luarocks install lrandom
• if you want see more details, see also https://github.com/Kong/lua-resty-dns-client/issues/71#issuecomment-511929529
• i suggest you to remove random.lua in zhangbao0325/orangelib and add luarocks install lrandom into README.md @zhangbao0325

[zhangbao0325]

I feel sorry for causing your confusion and trouble , and I have confirmed this problem . So I update zhangbao0325/orangelib again and modified the README.md. Thank you again and wait for your more suggestions.