[NEW] Add timer command to support execute Lua codes interval

[liexusong]

For example：

$ redis-cli> timer "local a = 1 + 2" 1000

would execute local a = 1 + 2 every 1 second。

Some time we would doing something by timer，example：Check key if exists and doing something.

[enjoy-binbin]

it sounds like this timer things should be done the the client side, rather than the redis server side.
like when do you stop the timer? delete a timer, update a timer, it will need a lot code in the server side

but in the client side, you can control everything, like a while loop, check the key exist or not, do some things

[sundb]

Wouldn't it be better to use shell command for this?
while true; do redis-cli eval "local a = 1 + 2" 0; sleep 1; done

[madolson]

I think it's a reasonable idea, and might play in more interestingly with functions as a cron.

[tzongw]

Hey, I am doing some similar things, hope this project can help.
redis-timer