Wait until WebUI is ready to open in browser (#2010)

* Wait until WebUI is ready

* Changelog

* Move openInBrowser out of timeout

CHANGELOG.md

@@ -14,6 +14,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
 ### Fixed
 - (WebUI) Handle serving non-default webui with "bundled"
+- (WebUI) Wait until WebUI is ready to open in browser
 
 ## [v2.2.2100] + [WebUI: v20260508.01] - 2026-05-08
 

server/src/main/kotlin/suwayomi/tachidesk/server/JavalinSetup.kt

@@ -27,7 +27,10 @@ import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.SupervisorJob
 import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.future.future
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withTimeoutOrNull
 import org.eclipse.jetty.server.ServerConnector
 import suwayomi.tachidesk.global.GlobalAPI
 import suwayomi.tachidesk.graphql.GraphQL
@@ -51,6 +54,7 @@ import java.util.concurrent.CompletableFuture
 import kotlin.concurrent.thread
 import kotlin.text.get
 import kotlin.time.Duration.Companion.days
+import kotlin.time.Duration.Companion.seconds
 
 object JavalinSetup {
     private val logger = KotlinLogging.logger {}
@@ -132,10 +136,15 @@ object JavalinSetup {
 
                 config.events.serverStarted {
                     if (serverConfig.initialOpenInBrowserEnabled.value) {
+                        scope.launch {
+                            withTimeoutOrNull(10.seconds) {
+                                WebInterfaceManager.isSetupComplete.first { it }
+                            }
                             Browser.openInBrowser()
                         }
                     }
                 }
+            }
 
         // when JVM is prompted to shutdown, stop javalin gracefully
         Runtime.getRuntime().addShutdownHook(

server/src/main/kotlin/suwayomi/tachidesk/server/util/WebInterfaceManager.kt

@@ -27,6 +27,7 @@ import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.SupervisorJob
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.sample
@@ -90,7 +91,7 @@ object WebInterfaceManager {
     private val preferences = Injekt.get<Application>().getSharedPreferences("server_util", Context.MODE_PRIVATE)
     private var currentUpdateTaskId: String = ""
 
-    private var isSetupComplete = false
+    val isSetupComplete = MutableStateFlow(false)
 
     private val json: Json by injectLazy()
     private val network: NetworkHelper by injectLazy()
@@ -196,7 +197,7 @@ object WebInterfaceManager {
         @OptIn(DelicateCoroutinesApi::class)
         GlobalScope.launchIO {
             setupWebUI()
-            isSetupComplete = true
+            isSetupComplete.value = true
         }
     }
 
@@ -260,7 +261,7 @@ object WebInterfaceManager {
         val lastAutomatedUpdate = preferences.getLong(LAST_WEBUI_UPDATE_CHECK_KEY, System.currentTimeMillis())
 
         val task = {
-            if (isSetupComplete) {
+            if (isSetupComplete.value) {
                 val log =
                     KotlinLogging.logger(
                         "${logger.name}::scheduleWebUIUpdateCheck(" +