Nginx+Lua+Redis builds highly concurrent Web applications

This article shows you how to build a high-concurrency Web application using Nginx+Lua+Redis, Curl requests Nginx, Nginx queries Redis with Lua and returns json data.

1. Install
1. Install lua-redis-parser

#git clone https://github.com/agentzh/lua-redis-parser.git
 #export LUA_INCLUDE_DIR=/usr/include/lua5.1
 #make CC=gcc
 #make install CC=gcc

2. Install json

#wget http://files.luaforge.net/releases/json/json/0.9.50/json4lua-0.9.50.zip
#unzip json4lua-0.9.50.zip
 #cp json4lua-0.9.50/json/json.lua /usr/share/lua/5.1/

3. Install redis-lua

#git clone https://github.com/nrk/redis-lua.git
 #cp redis-lua/src/redis.lua /usr/share/lua/5.1/

Configure

        #vi /etc/nginx/nginx.conf
        http {
            include mime.types;
            default_type application/octet-stream;
            access_log logs/access.log;
            sendfile on;
            tcp_nopush on;
            tcp_nodelay on;
            keepalive_timeout 60;
            types_hash_max_size 2048;
            server_tokens off;
            lua_code_cache on;
            upstream redis_pool {
                server 192.168.1.105:6379;
                keepalive 1024 single; 
                // Defines the connection pool size, when the number of connections reaches this number, subsequent connections are short connections 
            }
            server {
                listen 80;
                server_name 192.168.1.104;
                location /get_redis{
                    #internal;
                    set_unescape_uri $key $arg_key;
                    redis2_query hgetall $key;
                    redis2_pass redis_pool;
                }
                location /json {
                    content_by_lua_file conf/test_redis.lua;
                }
            }
        }

Test
1. Script
              writes the test_redis.lua script
in the above configuration

        #vi test_redis.lua
        local json = require("json")
        local parser = require("redis.parser")
        local res = ngx.location.capture("/get_redis",{args = { key = ngx.var.arg_key }})
        if res.status == 200 then
            reply = parser.parse_reply(res.body)
            value = json.encode(reply)
            ngx.say(value)
            a = json.decode(value)
            ngx.say(a[2])
        end

2. Construct data

        #redis-cli -h 192.168.1.105 -p 6379
        redis 192.168.1.105:6379>HMSET testnlr www www.joyvc.cn mail mail.joyvc.cn

3. Start testing

        #curl 'http://192.168.1.104/json?key=testnlr'
        ["www", "www.joyvc.cn", "mail", "mail.joyvc.cn"]