add sub routes to backend app

in the shape of websocket and post \ get
with receiving of some request model

backend/src/main/scala/industries/sunshine/planningpoker/App.scala

@@ -1,32 +0,0 @@
-package industries.sunshine.planningpoker
-
-import cats.effect._
-import cats.syntax.all._
-import org.http4s._, org.http4s.dsl.io._, org.http4s.implicits._
-import com.comcast.ip4s._
-import org.http4s.HttpRoutes
-import org.http4s.dsl.io._
-import org.http4s.implicits._
-import org.http4s.ember.server._
-
-object App extends IOApp.Simple {
-
-  val service = HttpRoutes
-    .of[IO] { case _ =>
-      Ok("hello")
-    }
-    .orNotFound
-
-  override def run: IO[Unit] = {
-    val a = 1
-    IO.println(s"Hello, World! $a") >>
-      EmberServerBuilder
-        .default[IO]
-        .withHost(ipv4"0.0.0.0")
-        .withPort(port"8080")
-        .withHttpApp(service)
-        .build
-        .use(_ => IO.never)
-        .as(ExitCode.Success)
-  }
-}

backend/src/main/scala/industries/sunshine/planningpoker/BackendApp.scala

@@ -0,0 +1,54 @@
+package industries.sunshine.planningpoker
+
+import cats.effect._
+import cats.syntax.all._
+import org.http4s._, org.http4s.dsl.io._, org.http4s.implicits._
+import com.comcast.ip4s._
+import org.http4s.HttpRoutes
+import org.http4s.dsl.io._
+import org.http4s.implicits._
+import org.http4s.ember.server._
+import org.http4s.websocket.WebSocketFrame
+
+import io.circe.generic.auto._
+import org.http4s.circe.CirceEntityDecoder._
+import scala.concurrent.duration._
+import org.http4s.server.websocket.WebSocketBuilder
+import fs2._
+
+object BackendApp extends IOApp.Simple {
+
+  def service(wsb: WebSocketBuilder[IO]) = HttpRoutes
+    .of[IO] {
+      case req @ POST -> Root / login => {
+        for {
+          data <- req.as[Requests.LogIn]
+          resp <- Ok(s"got some: ${data}")
+        } yield resp
+      }
+      case GET -> Root / subscribe => {
+        val send: Stream[IO, WebSocketFrame] =
+          Stream.awakeEvery[IO](1.seconds).map(_ => WebSocketFrame.Text("text"))
+        val receive: Pipe[IO, WebSocketFrame, Unit] = _.evalMap {
+          case WebSocketFrame.Text(text, _) => Sync[IO].delay(println(text))
+          case other                        => Sync[IO].delay(println(other))
+        }
+        wsb.build(send, receive)
+      }
+      case _ => Ok("hello")
+    }
+    .orNotFound
+
+  override def run: IO[Unit] = {
+    val a = 1
+    IO.println(s"Hello, World! $a") >>
+      EmberServerBuilder
+        .default[IO]
+        .withHost(ipv4"0.0.0.0")
+        .withPort(port"8080")
+        .withHttpWebSocketApp(service)
+        .build
+        .use(_ => IO.never)
+        .as(ExitCode.Success)
+  }
+}

build.sbt

@@ -35,6 +35,9 @@ lazy val frontend = project
   )
   .dependsOn(common)
 
+val circeVersion = "0.14.1"
+val http4sVersion = "1.0.0-M39"
+
 lazy val backend = project
   .in(file("backend"))
   .settings(
@@ -42,16 +45,21 @@ lazy val backend = project
     libraryDependencies ++= Seq(
       "org.http4s" %% "http4s-ember-client" % http4sVersion,
       "org.http4s" %% "http4s-ember-server" % http4sVersion,
-      "org.http4s" %% "http4s-dsl" % http4sVersion
+      "org.http4s" %% "http4s-dsl" % http4sVersion,
+      "org.http4s" %% "http4s-circe" % http4sVersion
     ),
     // available for 2.12, 2.13, 3.2
     libraryDependencies += "co.fs2" %% "fs2-core" % "3.6.1",
     libraryDependencies += "org.typelevel" %% "cats-core" % "2.9.0",
-    libraryDependencies += "org.typelevel" %% "cats-effect" % "3.4.9"
+    libraryDependencies += "org.typelevel" %% "cats-effect" % "3.4.9",
+    libraryDependencies ++= Seq(
+      "io.circe" %% "circe-core",
+      "io.circe" %% "circe-generic",
+      "io.circe" %% "circe-parser"
+    ).map(_ % circeVersion)
   )
   .dependsOn(common)
 
-val http4sVersion = "1.0.0-M39"
 lazy val common = project
   .in(file("common"))
   .settings(

common/src/main/scala/industries/sunshine/planningpoker/Requests.scala

@@ -0,0 +1,5 @@
+package industries.sunshine.planningpoker
+
+object Requests {
+  final case class LogIn(roomName: String, nickname: String, password: String)
+}