openresty 使用lua-resty-shell 執行shell 腳本

lua-resty-shell 是一個很不錯的項目，讓我們可以無阻塞的執行shell命令，之間的通信
是通過socket （一般是unix socket）

環境准備

• docker-compose 文件

version: "3"
services:
  app:
   build: ./
   ports:
   - "8080:80"
   volumes:
   - "./app/:/opt/app/"
   - "./nginx.conf:/usr/local/openresty/nginx/conf/nginx.conf"

• dockerfile

FROM openresty/openresty:alpine-fat
LABEL author="[e-mail]"
WORKDIR /sockproc
COPY ./sockproc/ /sockproc/
RUN make sockproc
COPY entrypoint.sh /entrypoint.sh
COPY sockproc.sh /sockproc.sh
COPY shell.lua /usr/local/openresty/lualib/resty/shell.lua
ENTRYPOINT [ "/entrypoint.sh" ]

• dockerfile 說明
  dockerfile 同時進行了socket 服務的構建以及shell lua 封裝的copy，entrypoint 進行服務的啟動

entrypoint.sh:
#!/bin/sh
sh /sockproc.sh
exec /usr/local/openresty/bin/openresty -g "daemon off;"
sockproc.sh:
#!/bin/sh
/sockproc/sockproc /tmp/shell.sock

openresty 集成測試

• lua 調用代碼

app/app.lua

local shell = require("resty.shell")
local args = {
   socket = "unix:/tmp/shell.sock",
}
function call()
    local status, out, err = shell.execute("cat /proc/sys/kernel/random/uuid", args)
    ngx.say(out)
end
return call

• openresty content_by_Lua 階段調用lua shell 封裝

+ user root;

http {
+ lua_package_path '/opt/app/?.lua;;';

+ location /test {
+ content_by_lua_block {
+ require("app")()
+ }

• 測試效果
  

參考資料

https://github.com/juce/lua-resty-shell
https://github.com/rongfengliang/lua-resty-shell-docker-running