Redis: Count, print or delete keys that expires after a specified TTL

README.md

Usage:

• redis-cli --eval clean-keys.lua <mode> <days>
• redis-cli --eval clean-keys.lua count 1
• redis-cli --eval clean-keys.lua print 1
• redis-cli --eval clean-keys.lua delete 1

For example, redis-cli --eval clean-keys.lua count 2 will return the number of keys expiring in more than 2 days

expired-keys.lua

local mode = KEYS[1]
local count = 0
local cursor = 0

local maxTTL = 2 * 24 * 3600 -- act on keys that expires in more 2 days
if (KEYS[2]) then
  maxTTL = tonumber(KEYS[2]) * 24 * 3600
end

redis.call('SELECT', 5)

repeat
  local result = redis.call("SCAN", cursor);
  cursor = result[1];
  local keys = result[2]

  for i=1,#keys do
    local key = keys[i]
    local ttl = redis.call('TTL',key)

    if ttl > maxTTL then
      if mode == 'delete' then
        redis.call('DEL', key)
      end

      if mode == 'print' then
        print(key .. " " .. ttl)
      end

     count =  count + 1
    end
   end

until cursor == "0";

return count