profunktor.dev/redis4cats

Redis client for Scala built on top of Cats Effect, Fs2 and Lettuce (formerly Fs2 Redis) -> https://redis4cats.profunktor.dev/

Calvin Lee Fernandes

@calvinlfer

lol

Gabriel Volpe

@gvolpe

Awesome, I'll have a look in a few hours when I get to my laptop but if Jakub gave the green light that's fine :)

Tomasz Szymula

@tomaszym

Hello, I can't find any reason for an argument ev: Numeric[V] in interpreter.BaseRedis.zAddIncr where V is a member in ScoreWithValue[V] – unless I'm entirely missing something you might want to check it

Gabriel Volpe

@gvolpe

Hi @tomaszym , I think you're right. Would you like to raise an issue? I can fix it fairly quickly or if you would like to, feel free to send a PR :) Just let us know here to avoid work duplication.

Tomasz Szymula

@tomaszym

I'll gladly do it even if it's more a gesture than a substantial help this time :)

Gabriel Volpe

@gvolpe

Please do, go for it @tomaszym :)

Gabriel Volpe

@gvolpe

profunktor/redis4cats#132

Gabriel Volpe

@gvolpe

https://github.com/profunktor/redis4cats/releases/tag/0.9.0 :tada:

Madan Kumar Epuri

@madanepuri

what is the equivalent command for https://redis.io/commands/exists? I see only hExists in HashCommands

Gabriel Volpe

@gvolpe

Hi @madanepuri , it seems missing. Raise an issue or even better get a PR in :)

I'm curious though, in what cases would you need such command?

Madan Kumar Epuri

@madanepuri

@gvolpe Raised issue - profunktor/redis4cats#151 for exists command support

we use redis as global cache for whitelisting purposes. One of components writes to redis and other component only requires the presence of a key to process streaming events

Gabriel Volpe

@gvolpe

:+1:

PawelJ-PL

@PawelJ-PL

Hi. I would like to add Redis INFO command to library. Lettuce returns just String. What is the best approach in this project? Should I return raw String or convert it to Map<String, Any> or create custom structure? INFO command returns a lot of fields and I'm not sure, whether it's equal on each environment, so I think the best option is Map<String, Any>

Gabriel Volpe

@gvolpe

Hi @PawelJ-PL , returning a Map[String, Any] would be good for now I guess.

PawelJ-PL

@PawelJ-PL

In the meantime, I thought that it would be better to return Map[String, String]. I'll prepare PR tonight.

Gabriel Volpe

@gvolpe

Yeah that's fine too, I don't have any strong opinion on that so go with the one you prefer the most :)

PawelJ-PL

@PawelJ-PL

I've created issue profunktor/redis4cats#156 and PR profunktor/redis4cats#155 with some diagnostic Redis command

Gabriel Volpe

@gvolpe

Thanks @PawelJ-PL :tada:

ikempf

@ikempf

Hi. I have some truble understanding the incr command's interface.

def incr(key: K)(implicit N: Numeric[V]): F[Long]

It expects Numeric evidence for the value but that would mean that I create a Redis connection with a RedisCodec[String, Long]. Does it make any sens to write such a codec ? Everything is a string in redis and a Long codec would juste write longs as string and read strings as longs.
In this case I feel like the lettuce interface makes more sens

public RedisFuture<Long> incr(K key) {

Am I missing something here ?

Gabriel Volpe

@gvolpe

Hi @ikempf , it does matter indeed. What does it mean to increase a String value?

Lettuce's interface is lying to you. It'll blow up if the value contained in that key is not numeric.

From the Scala side we try to prevent these errors at compile time.

ikempf

@ikempf

Ok you're right.
I kinda knew this but it still feels weird because I want to do the parsing on a higher level (retrieve the string from redis and parse whatever I expect) and not inside a Codec.
But for incr it does make more sense, thx :)

Gabriel Volpe

@gvolpe

https://github.com/profunktor/redis4cats/releases/tag/0.9.1

Gabriel Volpe

@gvolpe

@PawelJ-PL @alirezameskin @zakolenko your changes are now out! :tada:

Rob Norris

@tpolecat

object RedisURI {
  def make[F[_]: Sync](uri: => String): F[JRedisURI] =
    Sync[F].delay(JRedisURI.create(uri))
}

@gvolpe why is this in F? Is JRedisURI.create impure?

Gabriel Volpe

@gvolpe

Yeah I think JRedisURI.create throws an Exception if the URI is not valid

Rob Norris

@tpolecat

In that case you could weaken that constraint to ApplicativeError and use catchNonFatal instead of delay.

(not a big deal)

Oh by the way I just replaced a file cache with redis4cats and it worked the first time! :tada:

Gabriel Volpe

@gvolpe

That sounds better, will get it done soon :)

Awesome, glad to hear!

Rob Norris

@tpolecat

Also I have never used Redis before.

Gabriel Volpe

@gvolpe

Redis is awesome!

I used to write games for a company in 2012 and we used Redis for everything

The best thing I built used the Pub/Sub mechanism

Rob Norris

@tpolecat

It seems good so far.

Paulius Imbrasas

@CremboC

Is there an example with watch in transactions? I found the issue but seems like nothing has happened since 2 weeks ago

Gabriel Volpe

@gvolpe

Not for now @CremboC , PRs welcome though :)

Paulius Imbrasas

@CremboC

I need an example because I don't know how to use it :D

but don't worry, I ended up not using redis :eyes:

Gabriel Volpe

@gvolpe

Hehe no problems

If you know how to use the command using plain Redis, you should be able to get it working in Scala, the API is pretty much autodiscoverable

Madan Kumar Epuri

@madanepuri

Is TTL(https://redis.io/commands/ttl) or PTTL(https://redis.io/commands/pttl) redis command supported?

Anyway opened issue profunktor/redis4cats#164

Gabriel Volpe

@gvolpe

Done @madanepuri . Only thing missing is docs, maybe someone else can PR that in :)

Madan Kumar Epuri

@madanepuri

Thanks @gvolpe

Where communities thrive

People

Repo info

Activity