シンプルなWebアプリを実装

Author: yokra9

.gitignore

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+target/
+.vscode
+.metals
+.bloop
+.bsp
+metals.sbt

.scalafmt.conf

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+version = "2.7.4"

build.sbt

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+val AkkaVersion = "2.6.8"
+val AkkaHttpVersion = "10.2.4"
+libraryDependencies ++= Seq(
+  "com.typesafe.akka" %% "akka-actor-typed" % AkkaVersion,
+  "com.typesafe.akka" %% "akka-stream" % AkkaVersion,
+  "com.typesafe.akka" %% "akka-http" % AkkaHttpVersion,
+  "ch.qos.logback" % "logback-classic" % "1.2.3"
+)

project/build.properties

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+sbt.version=1.4.7

src/main/scala/sample.scala

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+import akka.actor.typed.ActorSystem
+import akka.actor.typed.scaladsl.Behaviors
+import akka.event.Logging
+import akka.http.scaladsl.Http
+import akka.http.scaladsl.model._
+import akka.http.scaladsl.server.Directives._
+import scala.concurrent.Await
+import scala.concurrent.duration.Duration
+
+object main {
+
+  def main(args: Array[String]): Unit = {
+
+    implicit val system = ActorSystem(Behaviors.empty, "my-sample-app")
+
+    // GET /indexでリクエストのURLパラメータとUserAgentを返却する
+    val route =
+      (get & pathPrefix("index") & extractUri & headerValueByName(
+        "User-Agent"
+      )) { (uri, ua) =>
+        logRequestResult("/index", Logging.InfoLevel) {
+          complete(s"param: ${uri.query().toMap}, user-agent: ${ua}}")
+        }
+      }
+
+    val host = sys.props.get("http.host") getOrElse "0.0.0.0"
+    val port = sys.props.get("http.port").fold(8080) { _.toInt }
+
+    val f = Http().newServerAt(host, port).bind(route)
+
+    println(s"server at [$host:$port]")
+
+    Await.ready(f, Duration.Inf)
+  }
+}