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sbtでマルチプロジェクトな構成を作る

Posted at

やること

sbt のマルチプロジェクトに対応したgiter8テンプレートを作成する

環境

OS: Windows 11
Java : Open JDK 17.0.7
sbt : 1.9.0
scala : 3.3.0

参考

https://qiita.com/kijuky/items/64ea7e1c95ede6799a24
この記事で挙げられていた
https://github.com/kijuky/springboot-scala.g8/tree/scala3

ここ。scala3ブランチを使う。

構成はほぼ同じで、
serverだけちょっと違う。

変更点

build.sbt
val scala3Version = "3.3.0"
val AkkaVersion = "2.7.0"
val AkkaHttpVersion = "10.5.2"

ThisBuild / organization := "com.isageek.hakushimeita"
ThisBuild / scalaVersion := scala3Version
ThisBuild / version := "0.1.0-SNAPSHOT"

lazy val root = (project in file(".") withId "XNote")
  .aggregate(server, client, shared.jvm, shared.js)
  .settings(Compile / bgRun := (server / Compile / bgRun).evaluated)


lazy val server = project
  .dependsOn(shared.jvm)
  .enablePlugins(JavaAppPackaging, SbtWeb)
  .settings(
    Compile / mainClass := Some("com.isageek.hakushimeita.xnote.server.HttpServerRoutingMinimal"),
    libraryDependencies ++= Seq(
      "org.scalameta" %% "munit" % "0.7.29" % Test,
      "com.typesafe.akka" %% "akka-actor-typed" % AkkaVersion,
      "com.typesafe.akka" %% "akka-stream" % AkkaVersion,
      "com.typesafe.akka" %% "akka-http" % AkkaHttpVersion,
    )
  )

lazy val client = project
  .dependsOn(shared.js)
  .enablePlugins(ScalaJSPlugin, ScalaJSWeb)
  .settings(
    scalaJSUseMainModuleInitializer := true,
    libraryDependencies  += "org.scala-js" % "scalajs-dom_sjs1_2.13" % "2.4.0"
  )


lazy val shared = crossProject(JSPlatform, JVMPlatform)
  .crossType(CrossType.Pure)
  .in(file("shared"))
  .jsConfigure(_.enablePlugins(ScalaJSWeb))

serverのプロジェクトのごちゃごちゃした設定を除いて
mainクラスをHttpServerRoutingMinimalにしている。
それからlibraryDependenciesはAkka-HTTP関連のものになっている。

HttpServerRoutingMinimalオブジェクトはこちら。

/server/src/main/scala/$package$/server/Main.scala
/*
@main def hello: Unit =
  println("Hello world!")
  println(msg)

def msg = "I was compiled by Scala 3. :)"
*/

/*
 * Copyright (C) 2020-2023 Lightbend Inc. <https://www.lightbend.com>
 */

//package docs.http.scaladsl
package com.isageek.hakushimeita.xnote.server

import akka.actor.typed.ActorSystem
import akka.actor.typed.scaladsl.Behaviors
import akka.http.scaladsl.Http
import akka.http.scaladsl.model._
import akka.http.scaladsl.server.Directives._
import scala.io.StdIn

object HttpServerRoutingMinimal {

  def main(args: Array[String]): Unit = {

    implicit val system = ActorSystem(Behaviors.empty, "my-system")
    // needed for the future flatMap/onComplete in the end
    implicit val executionContext = system.executionContext

    val route =
      path("hello") {
        get {
          complete(HttpEntity(ContentTypes.`text/html(UTF-8)`, "<h1>Say hello to akka-http</h1>"))
        }
      }

    val bindingFuture = Http().newServerAt("localhost", 8080).bind(route)

    println(s"Server now online. Please navigate to http://localhost:8080/hello\nPress RETURN to stop...")
    StdIn.readLine() // let it run until user presses return
    bindingFuture
      .flatMap(_.unbind()) // trigger unbinding from the port
      .onComplete(_ => system.terminate()) // and shutdown when done
  }
}

sbt run してやれば、サーバが起動する。

予定

clientを動かす方法はまだよくわかっていない。
scala.jsからjavascriptを吐き出すようにさせたい。

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