Update a key, send out a notice, and log the notice.

updatesendnotice.lua

--2 key changelog update millisecond-epoch
local key, changelog = unpack(KEYS);
local update, epoch = unpack(ARGV);

local result = redis.call('SET', key, update);

local notice = cjson.encode({key = key, value = update, time = epoch});

redis.call('ZADD', changelog, epoch, notice);
redis.call('ZREMRANGEBYSCORE', changelog, '-inf', epoch - 86400000);

redis.call('PUBLISH', changelog, notice);

return result;