refactoring

src/main/kotlin/eventDemo/Application.kt

@@ -1,5 +1,6 @@
 package eventDemo
 
+import eventDemo.configuration.configure
 import io.ktor.server.application.Application
 import io.ktor.server.engine.embeddedServer
 import io.ktor.server.netty.Netty

src/main/kotlin/eventDemo/Configure.kt

@@ -1,29 +0,0 @@
-package eventDemo
-
-import eventDemo.app.actions.GameEventReactionSubscriber
-import eventDemo.plugins.configureHttp
-import eventDemo.plugins.configureHttpRouting
-import eventDemo.plugins.configureKoin
-import eventDemo.plugins.configureSecurity
-import eventDemo.plugins.configureSerialization
-import eventDemo.plugins.configureSockets
-import eventDemo.plugins.configureWebSocketsGameRoute
-import io.ktor.server.application.Application
-import org.koin.ktor.ext.get
-
-fun Application.configure() {
-    configureKoin()
-
-    configureSecurity()
-
-    configureSerialization()
-
-    configureSockets()
-    configureWebSocketsGameRoute(get(), get())
-
-    configureHttp()
-    configureHttpRouting()
-
-    GameEventReactionSubscriber(get(), get())
-        .init()
-}

src/main/kotlin/eventDemo/app/GameCommandHandler.kt

@@ -1,13 +1,14 @@
 package eventDemo.app.actions
 
-import eventDemo.app.actions.playNewCard.PlayCardCommand
-import eventDemo.shared.command.GameCommandStream
-import eventDemo.shared.entity.Player
-import eventDemo.shared.event.CardIsPlayedEvent
-import eventDemo.shared.event.GameEvent
-import eventDemo.shared.event.GameEventStream
-import eventDemo.shared.event.GameState
-import eventDemo.shared.event.buildStateFromEventStream
+import eventDemo.app.GameState
+import eventDemo.app.command.GameCommand
+import eventDemo.app.command.GameCommandStream
+import eventDemo.app.command.PlayCardCommand
+import eventDemo.app.entity.Player
+import eventDemo.app.event.CardIsPlayedEvent
+import eventDemo.app.event.GameEvent
+import eventDemo.app.event.GameEventStream
+import eventDemo.app.event.buildStateFromEventStream
 import io.ktor.websocket.Frame
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
@@ -17,7 +18,7 @@ import kotlinx.coroutines.launch
 import kotlinx.coroutines.runBlocking
 
 /**
- * Listen [PlayCardCommand] on [GameCommandStream], check the validity and execute the action.
+ * Listen [GameCommand] on [GameCommandStream], check the validity and execute an action.
  *
  * This action can be executing an action and produce a new [GameEvent] after verification.
  */
@@ -64,10 +65,10 @@ class GameCommandHandler(
             }
         }
     }
-}
 
-private fun GameState.commandCardCanBeExecuted(command: PlayCardCommand): Boolean =
-    canBePlayThisCard(
-        command.payload.player,
-        command.payload.card,
-    )
+    private fun GameState.commandCardCanBeExecuted(command: PlayCardCommand): Boolean =
+        canBePlayThisCard(
+            command.payload.player,
+            command.payload.card,
+        )
+}

src/main/kotlin/eventDemo/app/GameEventPlayerNotificationListener.kt

@@ -1,14 +1,13 @@
-package eventDemo.app.actions
+package eventDemo.app
 
+import eventDemo.app.event.GameEvent
 import eventDemo.libs.event.EventBus
-import eventDemo.shared.GameId
-import eventDemo.shared.event.GameEvent
 import eventDemo.shared.toFrame
 import io.ktor.websocket.Frame
 import kotlinx.coroutines.channels.SendChannel
 import kotlinx.coroutines.runBlocking
 
-class GameEventPlayerNotificationSubscriber(
+class GameEventPlayerNotificationListener(
     private val eventBus: EventBus<GameEvent, GameId>,
     private val outgoing: SendChannel<Frame>,
 ) {

src/main/kotlin/eventDemo/app/GameEventReactionListener.kt

@@ -1,13 +1,12 @@
-package eventDemo.app.actions
+package eventDemo.app
 
+import eventDemo.app.event.GameEvent
+import eventDemo.app.event.GameStartedEvent
+import eventDemo.app.event.buildStateFromEventStream
 import eventDemo.libs.event.EventBus
 import eventDemo.libs.event.EventStream
-import eventDemo.shared.GameId
-import eventDemo.shared.event.GameEvent
-import eventDemo.shared.event.GameStartedEvent
-import eventDemo.shared.event.buildStateFromEventStream
 
-class GameEventReactionSubscriber(
+class GameEventReactionListener(
     private val eventBus: EventBus<GameEvent, GameId>,
     private val eventStream: EventStream<GameEvent, GameId>,
 ) {

src/main/kotlin/eventDemo/app/GameId.kt

@@ -1,7 +1,7 @@
-package eventDemo.shared
+package eventDemo.app
 
+import eventDemo.configuration.GameIdSerializer
 import eventDemo.libs.event.AggregateId
-import eventDemo.plugins.GameIdSerializer
 import kotlinx.serialization.Serializable
 import java.util.UUID
 

src/main/kotlin/eventDemo/app/GameState.kt

@@ -1,10 +1,11 @@
-package eventDemo.shared.event
+package eventDemo.app
 
-import eventDemo.shared.GameId
-import eventDemo.shared.entity.Card
-import eventDemo.shared.entity.Deck
-import eventDemo.shared.entity.Player
+import eventDemo.app.entity.Card
+import eventDemo.app.entity.Deck
+import eventDemo.app.entity.Player
+import kotlinx.serialization.Serializable
 
+@Serializable
 data class GameState(
     val gameId: GameId,
     val players: Set<Player> = emptySet(),
@@ -16,6 +17,7 @@ data class GameState(
     val deck: Deck = Deck(players.toList()),
     val isStarted: Boolean = false,
 ) {
+    @Serializable
     data class LastCard(
         val card: Card,
         val player: Player,

src/main/kotlin/eventDemo/app/actions/HttpRoute.kt

@@ -1,10 +1,11 @@
-package eventDemo.app.actions.readLastPlayedCard
+package eventDemo.app.actions
 
+import eventDemo.app.GameId
+import eventDemo.app.event.CardIsPlayedEvent
+import eventDemo.app.event.GameEventStream
+import eventDemo.app.event.buildStateFromEventStream
+import eventDemo.configuration.GameIdSerializer
 import eventDemo.libs.event.readLastOf
-import eventDemo.plugins.GameIdSerializer
-import eventDemo.shared.GameId
-import eventDemo.shared.event.CardIsPlayedEvent
-import eventDemo.shared.event.GameEventStream
 import io.ktor.http.HttpStatusCode
 import io.ktor.resources.Resource
 import io.ktor.server.application.call
@@ -25,6 +26,12 @@ class Game(
     class Card(
         val game: Game,
     )
+
+    @Serializable
+    @Resource("state")
+    class State(
+        val game: Game,
+    )
 }
 
 /**
@@ -36,10 +43,25 @@ fun Routing.readLastPlayedCard() {
     /*
      * Read the last played card on the game.
      */
-    get<Game.Card> { card ->
+    get<Game.Card> { body ->
         eventStream
-            .readLastOf<CardIsPlayedEvent, _, _>(card.game.id)
+            .readLastOf<CardIsPlayedEvent, _, _>(body.game.id)
             ?.let { call.respond(it.card) }
             ?: call.response.status(HttpStatusCode.BadRequest)
     }
 }
+
+/**
+ * API route to read the last card played.
+ */
+fun Routing.readGameState() {
+    val eventStream by inject<GameEventStream>()
+
+    /*
+     * Read the last played card on the game.
+     */
+    get<Game.State> { body ->
+        val state = body.game.id.buildStateFromEventStream(eventStream)
+        call.respond(state)
+    }
+}

src/main/kotlin/eventDemo/app/actions/playNewCard/HttpRoute.kt

@@ -1,61 +0,0 @@
-package eventDemo.app.actions.playNewCard
-
-import eventDemo.libs.command.send
-import eventDemo.shared.GameId
-import eventDemo.shared.command.GameCommandStreamInMemory
-import eventDemo.shared.entity.Card
-import eventDemo.shared.entity.Player
-import io.ktor.http.HttpStatusCode
-import io.ktor.resources.Resource
-import io.ktor.server.application.call
-import io.ktor.server.auth.authenticate
-import io.ktor.server.auth.principal
-import io.ktor.server.request.receive
-import io.ktor.server.resources.post
-import io.ktor.server.response.respondNullable
-import io.ktor.server.routing.Routing
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.launch
-import kotlinx.serialization.Serializable
-
-@Serializable
-@Resource("/game/{id}")
-class GameRoute(
-//    @Serializable(with = GameIdSerializer::class)
-    val id: GameId,
-) {
-    @Serializable
-    @Resource("card")
-    class Card(
-        val game: GameRoute,
-    )
-}
-
-/**
- * API route to send a request to play card.
- */
-fun Routing.playNewCard() {
-    val commandStream = GameCommandStreamInMemory()
-    authenticate {
-        /*
-         * A player request to play a new card.
-         *
-         * It always returns [HttpStatusCode.OK], but it is not mean that card is already played!
-         */
-        post<GameRoute.Card> {
-            val card = call.receive<Card>()
-            val name = call.principal<Player>()!!
-            launch(Dispatchers.Default) {
-                commandStream.send(
-                    PlayCardCommand(
-                        it.game.id,
-                        name,
-                        card,
-                    ),
-                )
-            }
-
-            call.respondNullable<Any?>(HttpStatusCode.OK, null)
-        }
-    }
-}

src/main/kotlin/eventDemo/app/command/GameCommandStream.kt

@@ -1,6 +1,5 @@
-package eventDemo.shared.command
+package eventDemo.app.command
 
-import eventDemo.app.actions.playNewCard.GameCommand
 import eventDemo.libs.command.CommandStream
 import eventDemo.libs.command.CommandStreamChannel
 import eventDemo.libs.command.CommandStreamInMemory

src/main/kotlin/eventDemo/app/command/PlayCardCommand.kt

@@ -1,10 +1,10 @@
-package eventDemo.app.actions.playNewCard
+package eventDemo.app.command
 
+import eventDemo.app.GameId
+import eventDemo.app.entity.Card
+import eventDemo.app.entity.Player
 import eventDemo.libs.command.Command
 import eventDemo.libs.command.CommandId
-import eventDemo.shared.GameId
-import eventDemo.shared.entity.Card
-import eventDemo.shared.entity.Player
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 

src/main/kotlin/eventDemo/app/entity/Card.kt

@@ -1,6 +1,6 @@
-package eventDemo.shared.entity
+package eventDemo.app.entity
 
-import eventDemo.plugins.UUIDSerializer
+import eventDemo.configuration.UUIDSerializer
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 import java.util.UUID

src/main/kotlin/eventDemo/app/entity/Deck.kt

@@ -1,4 +1,4 @@
-package eventDemo.shared.entity
+package eventDemo.app.entity
 
 import kotlinx.serialization.Serializable
 

src/main/kotlin/eventDemo/app/entity/Player.kt

@@ -1,8 +1,8 @@
-package eventDemo.shared.entity
+package eventDemo.app.entity
 
+import eventDemo.configuration.PlayerIdSerializer
+import eventDemo.configuration.UUIDSerializer
 import eventDemo.libs.event.AggregateId
-import eventDemo.plugins.PlayerIdSerializer
-import eventDemo.plugins.UUIDSerializer
 import io.ktor.server.auth.Principal
 import kotlinx.serialization.Serializable
 import java.util.UUID

src/main/kotlin/eventDemo/app/event/CardIsPlayedEvent.kt

@@ -1,10 +1,10 @@
-package eventDemo.shared.event
+package eventDemo.app.event
 
+import eventDemo.app.GameId
+import eventDemo.app.entity.Card
+import eventDemo.app.entity.Deck
+import eventDemo.app.entity.Player
 import eventDemo.libs.event.Event
-import eventDemo.shared.GameId
-import eventDemo.shared.entity.Card
-import eventDemo.shared.entity.Deck
-import eventDemo.shared.entity.Player
 import kotlinx.serialization.Serializable
 
 /**

src/main/kotlin/eventDemo/app/event/GameEventBus.kt

@@ -1,7 +1,7 @@
-package eventDemo.shared.event
+package eventDemo.app.event
 
+import eventDemo.app.GameId
 import eventDemo.libs.event.EventBus
-import eventDemo.shared.GameId
 
 class GameEventBus(
     bus: EventBus<GameEvent, GameId>,

src/main/kotlin/eventDemo/app/event/GameEventStream.kt

@@ -1,8 +1,8 @@
-package eventDemo.shared.event
+package eventDemo.app.event
 
+import eventDemo.app.GameId
 import eventDemo.libs.event.EventBus
 import eventDemo.libs.event.EventStream
-import eventDemo.shared.GameId
 
 /**
  * A stream to publish and read the played card event.

src/main/kotlin/eventDemo/app/event/GameStateBuilder.kt

@@ -1,8 +1,9 @@
-package eventDemo.shared.event
+package eventDemo.app.event
 
+import eventDemo.app.GameId
+import eventDemo.app.GameState
+import eventDemo.app.entity.Card
 import eventDemo.libs.event.EventStream
-import eventDemo.shared.GameId
-import eventDemo.shared.entity.Card
 
 fun GameId.buildStateFromEventStream(eventStream: EventStream<GameEvent, GameId>): GameState =
     buildStateFromEvents(
@@ -61,7 +62,7 @@ private fun GameId.buildStateFromEvents(events: List<GameEvent>): GameState =
             is GameStartedEvent -> {
                 state.copy(
                     lastColor = (event.deck.discard.first() as? Card.ColorCard)?.color,
-                    lastCard = GameState.LastCard(event.deck.discard.first(), event.firstPlayer),
+                    lastCard = eventDemo.app.GameState.LastCard(event.deck.discard.first(), event.firstPlayer),
                     lastPlayer = event.firstPlayer,
                     deck = event.deck,
                     isStarted = true,

src/main/kotlin/eventDemo/configuration/Configure.kt

@@ -0,0 +1,22 @@
+package eventDemo.configuration
+
+import eventDemo.app.GameEventReactionListener
+import io.ktor.server.application.Application
+import org.koin.ktor.ext.get
+
+fun Application.configure() {
+    configureKoin()
+
+    configureSecurity()
+
+    configureSerialization()
+
+    configureSockets()
+    configureWebSocketsGameRoute(get(), get())
+
+    configureHttp()
+    configureHttpRouting()
+
+    GameEventReactionListener(get(), get())
+        .init()
+}

src/main/kotlin/eventDemo/configuration/HTTP.kt

@@ -1,4 +1,4 @@
-package eventDemo.plugins
+package eventDemo.configuration
 
 import io.ktor.http.HttpHeaders
 import io.ktor.http.HttpMethod

src/main/kotlin/eventDemo/configuration/Koin.kt

@@ -1,9 +1,9 @@
-package eventDemo.plugins
+package eventDemo.configuration
 
+import eventDemo.app.event.GameEventBus
+import eventDemo.app.event.GameEventStream
 import eventDemo.libs.event.EventBusInMemory
 import eventDemo.libs.event.EventStreamInMemory
-import eventDemo.shared.event.GameEventBus
-import eventDemo.shared.event.GameEventStream
 import io.ktor.server.application.Application
 import io.ktor.server.application.install
 import org.koin.dsl.module

src/main/kotlin/eventDemo/configuration/Routing.kt

@@ -1,7 +1,7 @@
-package eventDemo.plugins
+package eventDemo.configuration
 
-import eventDemo.app.actions.playNewCard.playNewCard
-import eventDemo.app.actions.readLastPlayedCard.readLastPlayedCard
+import eventDemo.app.actions.readGameState
+import eventDemo.app.actions.readLastPlayedCard
 import io.ktor.http.HttpStatusCode
 import io.ktor.server.application.Application
 import io.ktor.server.application.install
@@ -24,7 +24,7 @@ fun Application.configureHttpRouting() {
     }
 
     routing {
-        playNewCard()
         readLastPlayedCard()
+        readGameState()
     }
 }

src/main/kotlin/eventDemo/configuration/Security.kt

@@ -1,4 +1,4 @@
-package eventDemo.plugins
+package eventDemo.configuration
 
 import com.auth0.jwt.JWT
 import com.auth0.jwt.algorithms.Algorithm
@@ -9,7 +9,6 @@ import io.ktor.server.auth.authentication
 import io.ktor.server.auth.jwt.JWTPrincipal
 import io.ktor.server.auth.jwt.jwt
 import io.ktor.server.response.respond
-import io.ktor.server.routing.get
 import io.ktor.server.routing.post
 import io.ktor.server.routing.routing
 import java.util.Date

src/main/kotlin/eventDemo/configuration/Serialization.kt

@@ -1,8 +1,8 @@
-package eventDemo.plugins
+package eventDemo.configuration
 
+import eventDemo.app.GameId
+import eventDemo.app.entity.Player.PlayerId
 import eventDemo.libs.command.CommandId
-import eventDemo.shared.GameId
-import eventDemo.shared.entity.Player.PlayerId
 import io.ktor.serialization.kotlinx.json.json
 import io.ktor.server.application.Application
 import io.ktor.server.application.install

src/main/kotlin/eventDemo/configuration/Sockets.kt

@@ -1,10 +1,10 @@
-package eventDemo.plugins
+package eventDemo.configuration
 
+import eventDemo.app.GameEventPlayerNotificationListener
 import eventDemo.app.actions.GameCommandHandler
-import eventDemo.app.actions.GameEventPlayerNotificationSubscriber
-import eventDemo.shared.entity.Player
-import eventDemo.shared.event.GameEventBus
-import eventDemo.shared.event.GameEventStream
+import eventDemo.app.entity.Player
+import eventDemo.app.event.GameEventBus
+import eventDemo.app.event.GameEventStream
 import io.ktor.server.application.Application
 import io.ktor.server.application.ApplicationCall
 import io.ktor.server.application.install
@@ -35,7 +35,7 @@ fun Application.configureWebSocketsGameRoute(
         authenticate {
             webSocket("/game") {
                 GameCommandHandler(eventStream, incoming, outgoing).init(call.getPlayer())
-                GameEventPlayerNotificationSubscriber(eventBus, outgoing).init()
+                GameEventPlayerNotificationListener(eventBus, outgoing).init()
             }
         }
     }

src/main/kotlin/eventDemo/libs/command/Command.kt

@@ -1,6 +1,6 @@
 package eventDemo.libs.command
 
-import eventDemo.plugins.CommandIdSerializer
+import eventDemo.configuration.CommandIdSerializer
 import kotlinx.serialization.Serializable
 import java.util.UUID
 

src/main/kotlin/eventDemo/libs/event/EventStream.kt

@@ -19,7 +19,7 @@ interface EventStream<E : Event<ID>, ID : AggregateId> {
     fun <R : E> readLastOf(
         aggregateId: ID,
         eventType: KClass<out R>,
-    ): E?
+    ): R?
 
     /** Reads all events associated with a given aggregate ID */
     fun readAll(aggregateId: ID): List<E>

src/main/kotlin/eventDemo/libs/event/EventStreamInMemory.kt

@@ -37,5 +37,5 @@ class EventStreamInMemory<E : Event<ID>, ID : AggregateId> : EventStream<E, ID>
     override fun readAll(aggregateId: ID): List<E> = events
 }
 
-inline fun <reified R : E, E : Event<ID>, ID : AggregateId> EventStreamInMemory<E, ID>.readLastOf(aggregateId: ID): R? =
+inline fun <reified R : E, E : Event<ID>, ID : AggregateId> EventStream<E, ID>.readLastOf(aggregateId: ID): R? =
     readLastOf(aggregateId, R::class)

src/main/kotlin/eventDemo/shared/FrameConverter.kt

@@ -1,7 +1,7 @@
 package eventDemo.shared
 
-import eventDemo.app.actions.playNewCard.GameCommand
-import eventDemo.shared.event.GameEvent
+import eventDemo.app.command.GameCommand
+import eventDemo.app.event.GameEvent
 import io.ktor.websocket.Frame
 import io.ktor.websocket.readText
 import kotlinx.serialization.json.Json