Nginx + Lua + 共享内存实现动态查询

lua_package_path "/usr/local/share/luajit-2.0.2/jit?.lua;;";
lua_shared_dict devicedb 45m;
    location /query {
       default_type 'text/plain';
       content_by_lua '
                local args = ngx.req.get_uri_args()
                local devicetype = args["device"]
                local devicedb = ngx.shared.devicedb
                local res = devicedb:get(devicetype)

                ngx.say(res)
           ';
    }

    location /update {
        default_type 'text/plain';
        content_by_lua '
                local devicedb = ngx.shared.devicedb

                for item in io.lines("/usr/local/nginx-1.4.2/data/rule.txt") do
                    _,_,device_type, device_rule = string.find(item, "^(%a+)--(%a+)$")
                    devicedb:set(device_type,device_rule)
                end

                ngx.say("ok")
           ';
    }

    lua_package_path "/usr/local/share/luajit-2.0.2/jit?.lua;;";
    lua_shared_dict devicedb 45m; 
        location /query {
           default_type 'text/plain';
           content_by_lua '
                    local args = ngx.req.get_uri_args()
                    local devicetype = args["device"]
                    local devicedb = ngx.shared.devicedb
                    local res = devicedb:get(devicetype)

                    ngx.say(res)
               ';
        }

        location /update {
            default_type 'text/plain';
            content_by_lua '
                    local devicedb = ngx.shared.devicedb

                    for item in io.lines("/usr/local/nginx-1.4.2/data/rule.txt") do
                        _,_,device_type, device_rule = string.find(item, "^(%a+)--(%a+)$")
                        devicedb:set(device_type,device_rule)
                    end

                    ngx.say("ok")            
               ';
        }

rule.txt文件格式。

 

SAMSUNG--samRule
APPLE--appRule
XIAOMI--xiaRule

SAMSUNG--samRule
APPLE--appRule
XIAOMI--xiaRule

 

步骤1，访问/update，更新共享内存devicedb

步骤2，访问query?device=XIAOMI，返回xiaRule

步骤3，修改rule.txt，将xiaRule改为xiaRuleaaaa

步骤4，访问/update，更新共享内存devicedb

步骤5，访问query?device=XIAOMI，返回xiaRuleaaaa

 

内网响应时间在5~10ms。

 

参考文章：

http://my.oschina.net/766/blog/158972

http://haili.me/archives/722.html

 

转自http://blog.csdn.net/lxb_champagne/article/details/17099383