luin/ioredis

A delightful, performance-focused Redis client for Node and io.js.

Jason Shin

@JasonShin

is it like

enable the notification
redis.subscribe('EXPIRE', () => {})

Christian Roy

@roychri

Something like that, but it's not on EXPIRE that you will subscribe, but something like :__keyevent@0__:expire where 0 is the db. And the value you will get in the messag will be the name of the key that expire.

Jason Shin

@JasonShin

ok cool

thanks

do you know how to enable Redis Keyspace Notifications using https://hub.docker.com/_/redis?

Christian Roy

@roychri

Docker!!! :heart_eyes_cat: sure, one sec.

Jason Shin

@JasonShin

thank you so much~~

Christian Roy

@roychri

You mount your own redis.conf file (volume) and you change the CMD to pass that config file.
Go down to "Additionally, If you want to use your own redis.conf" on that link you just gave me for an example.

notify-keyspace-events xK to only enable expired events

Jason Shin

@JasonShin

https://github.com/orchardup/docker-redis/edit/master/redis.conf

I found this

do you just include that line in the file

and mount it?

Christian Roy

@roychri

If you use that image (and not the one you first showed me) then yes.

But that image is not the official image

If you use the official image, just make an empty file with that one line, mount it and change CMD to use your file

OR, you could also enable it by your app

once connected send CONFIG SET notify-keyspace-events xK
and that will enable it

without having to mount any file

Jason Shin

@JasonShin

yeah right

i chose the config mount approach

but having a problem

Christian Roy

@roychri

This is a docker discussion, not an ioredis discussion... mind to continue this in docker/docker room?

Jason Shin

@JasonShin

I've mounted redis.conf to /usr/local/etc/redis/redis.conf

and it contains notify-keyspace-events Ex

Code:

redis.set('test', 12, 'EX', 1);
console.log(await redis.get('test')); // return 12
redis.subscribe('__keyevent@0__:expire', (x, y, c, v, b) => {
    console.log('zz', x, y, c, v, b);
});

The console.log return zz null 1 undefined undefined undefined for the first time then errors

error: Connection in subscriber mode, only subscriber commands may be used
error: Error: Connection in subscriber mode, only subscriber commands may be used

sorry this is more of an ioredis question I believe

Christian Roy

@roychri

oh, yes it is. sorry.

So the error message says it.

You cannot use "subscribe" on the same connection that you use other commands.

Make a new connection for your subscribe.

redisSubscribe = new Redis();

or whatever

Jason Shin

@JasonShin

ahh right

Jason Shin

@JasonShin

hey @roychri I still do not receive any subscribe event for the key expire

what's wrong with above code?

Creating a new instance as redisSubscriber resolved the connection issue

however, there's no expire events received in the subscribe block

Christian Roy

@roychri

Are you using docker run or docker-compose or something else?

Jason Shin

@JasonShin

I'm using docker compose

Christian Roy

@roychri

docker-compose exec redis-master redis-cli config get notify-keyspace-events

Replace redis-master with the name of the redis service in your compose file. What do you get?

Jason Shin

@JasonShin

1) "notify-keyspace-events"
2) ""

ahh...

T_T !!

im dumb

Christian Roy

@roychri

Did you change the command in your docker-compose.yaml ?

Jason Shin

@JasonShin

nope

Christian Roy

@roychri

You have to tell redis to use your new config file

Jason Shin

@JasonShin

yeah right

1) "notify-keyspace-events"
2) "xE"

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