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-- Lua script to invalidate ANNs by rank
-- Uses the following keys
-- key1 - prefix for keys
-- key2 - number of elements to leave
local card = redis.call('ZCARD', KEYS[1])
local lim = tonumber(KEYS[2])
if card > lim then
local to_delete = redis.call('ZRANGE', KEYS[1], 0, card - lim - 1)
if to_delete then
for _, k in ipairs(to_delete) do
local tb = cjson.decode(k)
if type(tb) == 'table' and type(tb.redis_key) == 'string' then
redis.call('DEL', tb.redis_key)
-- Also train vectors
redis.call('DEL', tb.redis_key .. '_spam_set')
redis.call('DEL', tb.redis_key .. '_ham_set')
end
end
end
redis.call('ZREMRANGEBYRANK', KEYS[1], 0, card - lim - 1)
return to_delete
else
return {}
end
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