【转载请注明出处】:https://www.jianshu.com/p/cae825afaf3f

Lua 代码:

local locks = require "resty.lock"

local function acquire()
    local lock =locks:new("locks")
    local elapsed, err =lock:lock("limit_key") --互斥锁
    local limit_counter =ngx.shared.limit_counter --计数器

    local key = "ip:" ..os.time()
    local limit = 5 --限流大小
    local current =limit_counter:get(key)

    if current ~= nil and current + 1> limit then --如果超出限流大小
       lock:unlock()
       return 0
    end
    if current == nil then
       limit_counter:set(key, 1, 1) --第一次需要设置过期时间,设置key的值为1,过期时间为1秒
    else
        limit_counter:incr(key, 1) --第二次开始加1即可
    end
    lock:unlock()
    return 1
end
ngx.print(acquire())

Nginx

http {

    ……
    lua_shared_dict locks 10m;
    lua_shared_dict limit_counter 10m;

}

【转载请注明出处】: https://www.jianshu.com/p/cae825afaf3f


后端老鸟
103 声望4 粉丝