Lua雪花ID：时间戳加序列的唯一编号

local MACHINE = 7   -- 本服机器号 0 到 1023
local seq, lastSec = 0, 0
local function nextId()
    local sec = os.time()
    if sec == lastSec then
        seq = seq + 1
    else
        seq = 0
        lastSec = sec
    end
    return sec * 4194304
        + MACHINE * 4096
        + seq
end

local seen, dup = {}, false
for i = 1, 5000 do
    local id = nextId()
    if seen[id] then dup = true end
    seen[id] = true
end
local p = getplayerbyname("snow01")
sendmsg(p, 1, dup and "发现重复" or "5000 个编号唯一")