ZIO Redis

ZIO Redis is a ZIO native Redis client.

The client is still a work-in-progress. Watch this space!

Introduction

ZIO Redis is in the experimental phase of development, but its goals are:

• Type Safety
• Performance
• Minimum Dependency
• ZIO Native

Installation

Since the ZIO Redis is in the experimental phase, it is not released yet, but we can use snapshots:

libraryDependencies += "dev.zio" %% "zio-redis" % "<version>"

Example

To execute our ZIO Redis effect, we should provide the RedisExecutor layer to that effect. To create this layer we should also provide the following layers:

• RedisConfig — Using default one, will connect to the localhost:6379 Redis instance.
• BinaryCodec — In this example, we are going to use the built-in ProtobufCodec codec from zio-schema project.

To run this example we should put following dependencies in our build.sbt file:

libraryDependencies ++= Seq(
  "dev.zio" %% "zio-redis" % "<version>",
  "dev.zio" %% "zio-schema-protobuf" % "0.3.0"
)

import zio._
import zio.redis._
import zio.schema.codec._

object ZIORedisExample extends ZIOAppDefault {
  val myApp: ZIO[Redis, RedisError, Unit] = for {
    redis <- ZIO.service[Redis]
    _     <- redis.set("myKey", 8L, Some(1.minutes))
    v     <- redis.get("myKey").returning[Long]
    _     <- Console.printLine(s"Value of myKey: $v").orDie
    _     <- redis.hSet("myHash", ("k1", 6), ("k2", 2))
    _     <- redis.rPush("myList", 1, 2, 3, 4)
    _     <- redis.sAdd("mySet", "a", "b", "a", "c")
  } yield ()

  override def run = myApp.provide(
    Redis.layer,
    RedisExecutor.layer,
    ZLayer.succeed(RedisConfig.Default),
    ZLayer.succeed[BinaryCodec](ProtobufCodec)
  )
}

Testing

To test you can use the embedded redis instance by adding to your build:

libraryDependencies := "dev.zio" %% "zio-redis-embedded" % <version>

Then you can supply EmbeddedRedis.layer.orDie as your RedisConfig and you're good to go!

import zio._
import zio.redis._
import zio.schema.{DeriveSchema, Schema}
import zio.schema.codec.{BinaryCodec, ProtobufCodec}
import zio.test._
import zio.test.Assertion._
import java.util.UUID
object EmbeddedRedisSpec extends ZIOSpecDefault {
  final case class Item private (id: UUID, name: String, quantity: Int)
  object Item {
    implicit val itemSchema: Schema[Item] = DeriveSchema.gen[Item]
  }
  def spec = suite("EmbeddedRedis should")(
    test("set and get values") {
      for {
        redis <- ZIO.service[Redis]
        item   = Item(UUID.randomUUID, "foo", 2)
        _     <- redis.set(s"item.${item.id.toString}", item)
        found <- redis.get(s"item.${item.id.toString}").returning[Item]
      } yield assert(found)(isSome(equalTo(item)))
    }
  ).provideShared(
    EmbeddedRedis.layer.orDie,
    RedisExecutor.layer.orDie,
    ZLayer.succeed[BinaryCodec](ProtobufCodec),
    Redis.layer
  ) @@ TestAspect.silentLogging
}

Resources

• ZIO Redis by Dejan Mijic — Redis is one of the most commonly used in-memory data structure stores. In this talk, Dejan will introduce ZIO Redis, a purely functional, strongly typed client library backed by ZIO, with excellent performance and extensive support for nearly all of Redis' features. He will explain the library design using the bottom-up approach - from communication protocol to public APIs. Finally, he will wrap the talk by demonstrating the client's usage and discussing its performance characteristics.

Documentation

Learn more on the ZIO Redis homepage!

Contributing

For the general guidelines, see ZIO contributor's guide.

Code of Conduct

See the Code of Conduct

Support

Come chat with us on .

License

License