Overview

ZIO AWS is AWS wrapper for ZIO for all AWS services using the AWS Java SDK v2.

Introduction

The goal is to have access to all AWS functionality for cases when only a simple, direct access is needed from a ZIO application, or to be used as a building block for higher level wrappers around specific services.

Key features of ZIO AWS:

• Common configuration layer
• ZIO module layer per AWS service
• Wrapper for all operations on all services
• HTTP service implementations for functional Scala HTTP libraries, injected through ZIO’s module system
• ZStream wrapper around paginated operations
• Service-specific extra configuration
• More idiomatic Scala request and response types wrapping the Java classes

Installation

There are tones of artifacts published for each AWS service. We can pick whichever services we need.

Example

The following example uses the ElasticBeanstalk and EC2 APIs:

Note

See the artifacts page for the latest release.

libraryDependencies += "dev.zio" %% "zio-aws-core"             % "<version>"
libraryDependencies += "dev.zio" %% "zio-aws-ec2"              % "<version>"
libraryDependencies += "dev.zio" %% "zio-aws-elasticbeanstalk" % "<version>"
libraryDependencies += "dev.zio" %% "zio-aws-netty"            % "<version>"

And here is the example code:

import zio.aws.core.AwsError
import zio.aws.core.config.AwsConfig
import zio.aws.ec2.Ec2
import zio.aws.ec2.model._
import zio.aws.ec2.model.primitives._
import zio.aws.elasticbeanstalk.ElasticBeanstalk
import zio.aws.elasticbeanstalk.model._
import zio.aws.elasticbeanstalk.model.primitives._
import zio.aws.netty.NettyHttpClient
import zio._
import zio.stream._

object ZIOAWSExample extends ZIOAppDefault {
  val program: ZIO[Ec2 & ElasticBeanstalk, AwsError, Unit] =
    for {
      appsResult <- ElasticBeanstalk.describeApplications(
        DescribeApplicationsRequest(applicationNames = Some(List(ApplicationName("my-service"))))
      )
      app <- appsResult.getApplications.map(_.headOption)
      _ <- app match {
        case Some(appDescription) =>
          for {
            applicationName <- appDescription.getApplicationName
            _ <- Console
              .printLine(
                s"Got application description for $applicationName"
              )
              .ignore

            envStream = ElasticBeanstalk.describeEnvironments(
              DescribeEnvironmentsRequest(applicationName =
                Some(applicationName)
              )
            )

            _ <- envStream.run(ZSink.foreach { env =>
              env.getEnvironmentName.flatMap { environmentName =>
                (for {
                  environmentId <- env.getEnvironmentId
                  _ <- Console
                    .printLine(
                      s"Getting the EB resources of $environmentName"
                    )
                    .ignore

                  resourcesResult <-
                    ElasticBeanstalk.describeEnvironmentResources(
                      DescribeEnvironmentResourcesRequest(environmentId =
                        Some(environmentId)
                      )
                    )
                  resources <- resourcesResult.getEnvironmentResources
                  _ <- Console
                    .printLine(
                      s"Getting the EC2 instances in $environmentName"
                    )
                    .ignore
                  instances <- resources.getInstances
                  instanceIds <- ZIO.foreach(instances)(_.getId)
                  _ <- Console
                    .printLine(
                      s"Instance IDs are ${instanceIds.mkString(", ")}"
                    )
                    .ignore

                  reservationsStream = Ec2.describeInstances(
                    DescribeInstancesRequest(instanceIds = Some(instanceIds.map(id => zio.aws.ec2.model.primitives.InstanceId(ResourceId.unwrap(id)))))
                  )
                  _ <- reservationsStream.run(ZSink.foreach { reservation =>
                    reservation.getInstances
                      .flatMap { instances =>
                        ZIO.foreach(instances) { instance =>
                          for {
                            id <- instance.getInstanceId
                            typ <- instance.getInstanceType
                            launchTime <- instance.getLaunchTime
                            _ <- Console.printLine(s"  instance $id:").ignore
                            _ <- Console.printLine(s"    type: $typ").ignore
                            _ <- Console
                              .printLine(
                                s"    launched at: $launchTime"
                              )
                              .ignore
                          } yield ()
                        }
                      }
                  })
                } yield ()).catchAll { error =>
                  Console
                    .printLineError(
                      s"Failed to get info for $environmentName: $error"
                    )
                    .ignore
                }
              }
            })
          } yield ()
        case None =>
          ZIO.unit
      }
    } yield ()

  override def run: URIO[ZIOAppArgs, ExitCode] = {
    val httpClient = NettyHttpClient.default
    val awsConfig = httpClient >>> AwsConfig.default
    val aws = awsConfig >>> (Ec2.live ++ ElasticBeanstalk.live)

    program
      .provideLayer(aws)
      .either
      .flatMap {
        case Left(error) =>
          Console.printLineError(s"AWS error: $error").ignore.as(ExitCode.failure)
        case Right(_) =>
          ZIO.unit.as(ExitCode.success)
      }
  }
}