Use Lua scripting language to operate Redis in Nginx server

Use the Lua scripting language to operate Redis.

Since a lot of Lua code is written in Nginx
, it will make the configuration file very cumbersome, so here use content_by_lua_file to introduce Lua
script file.

To use content_by_lua_file, the nginx_lua_module module needs to be installed.

Installation introduction, click here: nginx_lua_module

The great god Zhang Yichun provides a very convenient development kit, as follows:

git clone https://github.com/agentzh/lua-resty-redis.git

In this package, there is a Lib directory, copy the files and subdirectories under the Lib directory to the directory /data/www/lua

In the Nginx configuration file, you need to add a line of code to import redis.lua.

Note: Add in the http segment.

lua_package_path “/data/www/lua/?.lua;;”;

In order to make the modification of the lua script take effect in time, a line of code needs to be added, as follows:

Note: In the server section, add code. If you do not add this code or set it to on, you need to restart Nginx.

lua_code_cache off;

In the Nginx configuration file, add a Location:

location /lua {
content_by_lua_file /data/www/lua/test.lua;
}

Note: import test.lua script file

Lua script file: test.lua.

local redis = require “resty.redis”
local cache = redis.new()
local ok, err = cache.connect(cache, ‘127.0.0.1’, ‘6379’)
cache:set_timeout(60000)
if not ok then
ngx.say(“failed to connect:”, err)
return
end
res, err = cache:set(“dog”, “an aniaml”)
if not ok then
ngx.say(“failed to set dog: “, err)
return
end
ngx.say(“set result: “, res)
local res, err = cache:get(“dog”)
if not res then
ngx.say(“failed to get dog: “, err)
return
end
if res == ngx.null then
ngx.say(“dog not found.”)
return
end
ngx. say(“dog: “, res)
local ok, err = cache:close()
if not ok then
ngx.say(“failed to close:”, err)
return
end
The test results are as follows:
[root@localhost conf]# curl http://localhost/lua
set result: OK
dog: an aniaml
Success!