Fix race when bots leave game

2 files changed, 37 insertions, 29 deletions

diff --git a/sw-client/build.gradle.kts b/sw-client/build.gradle.kts
index 68953bc4..f29fcbf8 100644
--- a/sw-client/build.gradle.kts
+++ b/sw-client/build.gradle.kts
@@ -8,6 +8,9 @@ kotlin {
         browser() // necessary for local dependency from JS UI module
     }
     sourceSets {
+        all {
+            languageSettings.useExperimentalAnnotation("kotlin.RequiresOptIn")
+        }
         val commonMain by getting {
             dependencies {
                 api(project(":sw-common-model"))
diff --git a/sw-client/src/commonMain/kotlin/org/luxons/sevenwonders/client/SevenWondersClient.kt b/sw-client/src/commonMain/kotlin/org/luxons/sevenwonders/client/SevenWondersClient.kt
index fc097d86..bf5778ad 100644
--- a/sw-client/src/commonMain/kotlin/org/luxons/sevenwonders/client/SevenWondersClient.kt
+++ b/sw-client/src/commonMain/kotlin/org/luxons/sevenwonders/client/SevenWondersClient.kt
@@ -1,7 +1,6 @@
 package org.luxons.sevenwonders.client
 
-import kotlinx.coroutines.async
-import kotlinx.coroutines.coroutineScope
+import kotlinx.coroutines.*
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.flow.map
@@ -150,30 +149,36 @@ class SevenWondersSession(private val stompSession: StompSessionWithKxSerializat
     }
 }
 
-suspend fun SevenWondersSession.createGameAndWaitLobby(gameName: String): LobbyDTO = coroutineScope {
-    val lobbies = watchLobbyJoined()
-    val joinedLobby = async { lobbies.first() }
-    createGame(gameName)
-    joinedLobby.await()
-}
-
-suspend fun SevenWondersSession.joinGameAndWaitLobby(gameId: Long): LobbyDTO = coroutineScope {
-    val lobbies = watchLobbyJoined()
-    val joinedLobby = async { lobbies.first() }
-    joinGame(gameId)
-    joinedLobby.await()
-}
-
-suspend fun SevenWondersSession.startGameAndAwaitFirstTurn(): PlayerTurnInfo = coroutineScope {
-    val gameStartedEvents = watchGameStarted()
-    val deferredFirstTurn = async { gameStartedEvents.first() }
-    startGame()
-    deferredFirstTurn.await()
-}
-
-suspend fun SevenWondersSession.joinGameAndWaitFirstTurn(gameId: Long): PlayerTurnInfo = coroutineScope {
-    val gameStartedEvents = watchGameStarted()
-    val deferredFirstTurn = async { gameStartedEvents.first() }
-    joinGame(gameId)
-    deferredFirstTurn.await()
-}
+suspend fun SevenWondersSession.createGameAndWaitLobby(gameName: String): LobbyDTO = doAndWaitForEvent(
+    send = { createGame(gameName) },
+    subscribe = { watchLobbyJoined() },
+)
+
+suspend fun SevenWondersSession.joinGameAndWaitLobby(gameId: Long): LobbyDTO = doAndWaitForEvent(
+    send = { joinGame(gameId) },
+    subscribe = { watchLobbyJoined() },
+)
+
+suspend fun SevenWondersSession.startGameAndAwaitFirstTurn(): PlayerTurnInfo = doAndWaitForEvent(
+    send = { startGame() },
+    subscribe = { watchGameStarted() },
+)
+
+suspend fun SevenWondersSession.joinGameAndWaitFirstTurn(gameId: Long): PlayerTurnInfo = doAndWaitForEvent(
+    send = { joinGame(gameId) },
+    subscribe = { watchGameStarted() },
+)
+
+suspend fun SevenWondersSession.leaveGameAndAwaitEnd() = doAndWaitForEvent(
+    send = { leaveGame() },
+    subscribe = { watchLobbyLeft() },
+)
+
+@OptIn(ExperimentalCoroutinesApi::class)
+private suspend fun <T> doAndWaitForEvent(send: suspend () -> Unit, subscribe: suspend () -> Flow<T>): T =
+    coroutineScope {
+        val eventsFlow = subscribe()
+        val deferredFirstEvent = async(start = CoroutineStart.UNDISPATCHED) { eventsFlow.first() }
+        send()
+        deferredFirstEvent.await()
+    }