ZIO Redis

Introduction

ZIO Redis is a ZIO-native Redis client. It aims to provide a type-safe and performant API for accessing Redis instances.

Installation

To use ZIO Redis, add the following line to your build.sbt:

libraryDependencies += "dev.zio" %% "zio-redis" % "0.2.0"

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" % "0.2.0",
  "dev.zio" %% "zio-schema-protobuf" % "0.4.9"
)

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

object ZIORedisExample extends ZIOAppDefault {
  
  object ProtobufCodecSupplier extends CodecSupplier {
    def get[A: Schema]: BinaryCodec[A] = ProtobufCodec.protobufCodec
  }
  
  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.local, ZLayer.succeed[CodecSupplier](ProtobufCodecSupplier))
}

Testing

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

libraryDependencies := "dev.zio" %% "zio-redis-embedded" % "0.2.0"

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

import zio._
import zio.redis._
import zio.redis.embedded.EmbeddedRedis
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 {
  object ProtobufCodecSupplier extends CodecSupplier {
    def get[A: Schema]: BinaryCodec[A] = ProtobufCodec.protobufCodec
  }
  
  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,
    ZLayer.succeed[CodecSupplier](ProtobufCodecSupplier),
    Redis.singleNode
  ) @@ 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 .

zio/zio-redis

zio

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