Smithy4Play

smithy4play is a routing gernator for the play2 framework based on smithy4s. Just write your smithy API definition and the plugin will generate everything you need for play2 framework usage.

---

QuickStart

Add smithy4play to your project

plugins.sbt

addSbtPlugin("com.typesafe.play" % "sbt-plugin" % "2.*.*")
addSbtPlugin("com.codecommit" % "sbt-github-packages" % "0.*.*")
addSbtPlugin(
  "com.disneystreaming.smithy4s" % "smithy4s-sbt-codegen" % "0.*.*"
)

build.sbt

.enablePlugins(Smithy4sCodegenPlugin, PlayScala)
  .settings(
    githubSettings,
    Compile / smithy4sInputDir := (ThisBuild / baseDirectory).value / "smithy-in",
    Compile / smithy4sOutputDir := (ThisBuild / baseDirectory).value / "smithy-out",
    libraryDependencies += "de.innfactory" %% "smithy4play" % "latestVersion")

Usage

• define your controllers in smithy files
• use smithy4s codegen (sbt compile)

Server

• create controller scala class
• extend your Controller with the generated Scala Type and smithy4play Type ContextRoute

@Singleton
class PreviewController @Inject(
)(implicit
  cc: ControllerComponents,
  ec: ExecutionContext
 ) extends PreviewControllerService[ContextRoute] {

  override def preview(bye: PreviewBody): ContextRoute[PreviewResponse] =
    Kleisli { rc =>
      EitherT.rightT[Future, ContextRouteError](PreviewResponse(Some("Hello")))
    }
}

Client

• import the EnhancedGenericAPIClient

import de.innfactory.smithy4play.client.GenericAPIClient.EnhancedGenericAPIClient
val previewControllerClient = PreviewControllerServiceGen.withClient(FakeRequestClient)
previewControllerClient.preview()

For a further examples take a look at the smithy4playTest project.

Routing

You can choose between autorouting or selfbinding.

Autorouting

• Annotate your controller with @AutoRouting
• add scalacOptions += "-Ymacro-annotations" to your build.sbt settings to enable macro annotations
• bind the smithy4play AutoRouter in the play routes file

-> / de.innfactory.smithy4play.AutoRouter

• add package name to configuration

smithy4play.autoRoutePackage = "your.package.name"

Selfbinding

• Create a ApiRouter class and inject your controller

@Singleton
class ApiRouter @Inject()(
  homeController: HomeController,
  pizzaController: PizzaController
)(implicit
  cc: ControllerComponents,
  ec: ExecutionContext
) extends BaseRouter {

  override val controllers: Seq[Routes] =
    Seq(homeController, pizzaController)
}

• bind the ApiRouter in the play routes file

-> / api.ApiRouter

Middlewares

If you want Middlewares that run before the endpoint logic follow these steps:

• Implement Middlewares

@Singleton
class ExampleMiddleware @Inject() (implicit
  executionContext: ExecutionContext
) extends MiddlewareBase {

  override protected def skipMiddleware(r: RoutingContext): Boolean = false

  override def logic(
    r: RoutingContext,
    next: RoutingContext => RouteResult[EndpointResult]
  ): RouteResult[EndpointResult] =
    next(r)
}

• Implement a MiddlewareRegistry and register your middlewares

class MiddlewareRegistry @Inject() (
  disableAbleMiddleware: DisableAbleMiddleware,
  testMiddlewareImpl: TestMiddlewareImpl,
  validateAuthMiddleware: ValidateAuthMiddleware
) extends MiddlewareRegistryBase {
  override val middlewares: Seq[MiddlewareBase] = Seq(ExampleMiddleware)
}

Credits:

innFactory ❤️ Open Source