refactor: streamline deep link handling and improve sqlite worker initialization

- Simplified `DeepLinkHandler` logic by removing redundant return values and enhancing route parsing with `ifBlank()`.
- Refactored `sqlite.worker.js` for better modularity and error handling.
- Added helper methods for script imports and initialization error management.

Signed-off-by: Stefan Mogeritsch <stefan.mo.co@gmail.com>

frontend/core/local-db/src/jsMain/resources/sqlite.worker.js

@@ -28,10 +28,24 @@ function processMessage(event) {
     const data = event.data;
   if (!data) return;
 
+  let result;
     try {
-      switch (data.action) {
+      result = executeAction(data);
+    } catch (err) {
+      console.error('[sqlite.worker] Error processing message:', err);
+      postMessage({id: data.id, error: err?.message ?? String(err)});
+      return;
+    }
+  postMessage({id: data.id, ...result});
+}
+
+function executeAction(data) {
+  switch (data.action) {
         case 'exec': {
-          if (!data.sql) throw new Error('exec: Missing sql string');
+          if (!data.sql) {
+            postMessage({id: data.id, error: 'exec: Missing sql string'});
+            return null;
+          }
           const rows = [];
           db.exec({
             sql: data.sql,
@@ -39,84 +53,93 @@ function processMessage(event) {
             rowMode: 'array',
             callback: (row) => rows.push(row),
           });
-          postMessage({id: data.id, results: {values: rows}});
-          break;
+          return {results: {values: rows}};
         }
         case 'begin_transaction':
           db.exec('BEGIN TRANSACTION;');
-          postMessage({id: data.id, results: []});
-          break;
+          return {results: []};
         case 'end_transaction':
           db.exec('END TRANSACTION;');
-          postMessage({id: data.id, results: []});
-          break;
+          return {results: []};
         case 'rollback_transaction':
           db.exec('ROLLBACK TRANSACTION;');
-          postMessage({id: data.id, results: []});
-          break;
+          return {results: []};
         default:
-          throw new Error(`Unsupported action: ${data.action}`);
-      }
-    } catch (err) {
-      console.error('[sqlite.worker] Error processing message:', err);
-      postMessage({id: data.id, error: err?.message ?? String(err)});
+          postMessage({id: data.id, error: `Unsupported action: ${data.action}`});
+          return null;
     }
 }
 
 // --- Initialization ---
 async function init() {
-    try {
-      // Load sqlite3.js via importScripts (avoids Webpack bundling issues)
-      try {
-        importScripts('sqlite3.js');
-      } catch (e) {
-        throw new Error(`importScripts('sqlite3.js') failed – is the file served at root? ${e.message}`);
-      }
+  // Load sqlite3.js via importScripts (avoids Webpack bundling issues)
+  const loadResult = tryImportScripts();
+  if (loadResult !== null) {
+    handleInitError(loadResult);
+    return;
+  }
 
-      if (typeof self.sqlite3InitModule !== 'function') {
-        throw new Error('sqlite3InitModule not found after importScripts – sqlite3.js may be corrupt or wrong version.');
-      }
+  if (typeof self.sqlite3InitModule !== 'function') {
+    handleInitError('sqlite3InitModule not found after importScripts – sqlite3.js may be corrupt or wrong version.');
+    return;
+  }
 
-      // Fetch WASM binary manually so we control the URL and can detect failures early
-      const wasmResponse = await fetch('sqlite3.wasm');
-      if (!wasmResponse.ok) {
-        throw new Error(`Failed to fetch sqlite3.wasm: ${wasmResponse.status} ${wasmResponse.statusText}`);
-      }
-      const wasmBinary = await wasmResponse.arrayBuffer();
+  // Fetch WASM binary manually so we control the URL and can detect failures early
+  let wasmBinary;
+  try {
+    const wasmResponse = await fetch('sqlite3.wasm');
+    if (!wasmResponse.ok) {
+      handleInitError(`Failed to fetch sqlite3.wasm: ${wasmResponse.status} ${wasmResponse.statusText}`);
+      return;
+    }
+    wasmBinary = await wasmResponse.arrayBuffer();
+  } catch (e) {
+    handleInitError(`Failed to fetch sqlite3.wasm: ${e.message}`);
+    return;
+  }
 
-      const sqlite3 = await self.sqlite3InitModule({
-        print: console.log,
-        printErr: console.error,
-        wasmBinary,
-      });
+  try {
+    const sqlite3 = await self.sqlite3InitModule({
+      print: console.log,
+      printErr: console.error,
+      wasmBinary,
+    });
 
-      const opfsAvailable = 'opfs' in sqlite3;
-      const dbName = 'app.db';
+    const dbName = 'app.db';
+    if ('opfs' in sqlite3) {
+      console.log(`[sqlite.worker] Using persistent OPFS database: ${dbName}`);
+      db = new sqlite3.oo1.OpfsDb(dbName);
+    } else {
+      console.warn('[sqlite.worker] OPFS not available – falling back to in-memory database');
+      db = new sqlite3.oo1.DB(dbName);
+    }
 
-      if (opfsAvailable) {
-        console.log(`[sqlite.worker] Using persistent OPFS database: ${dbName}`);
-        db = new sqlite3.oo1.OpfsDb(dbName);
-      } else {
-        console.warn('[sqlite.worker] OPFS not available – falling back to in-memory database');
-        db = new sqlite3.oo1.DB(dbName);
-      }
-
-      // Flush buffered messages
-      isReady = true;
-      console.log(`[sqlite.worker] Ready. Flushing ${messageQueue.length} buffered message(s).`);
-      while (messageQueue.length > 0) {
-        processMessage(messageQueue.shift());
-      }
+    // Flush buffered messages
+    isReady = true;
+    console.log(`[sqlite.worker] Ready. Flushing ${messageQueue.length} buffered message(s).`);
+    while (messageQueue.length > 0) {
+      processMessage(messageQueue.shift());
+    }
+  } catch (e) {
+    handleInitError(e?.message ?? String(e));
+  }
+}
 
+function tryImportScripts() {
+  try {
+    importScripts('sqlite3.js');
+    return null;
     } catch (e) {
-      initError = e?.message ?? String(e);
-      console.error('[sqlite.worker] Initialization failed:', e);
+    return `importScripts('sqlite3.js') failed – is the file served at root? ${e.message}`;
+  }
+}
 
-      // Notify all buffered callers so they don't hang indefinitely
-      while (messageQueue.length > 0) {
+function handleInitError(message) {
+  initError = message;
+  console.error('[sqlite.worker] Initialization failed:', message);
+  while (messageQueue.length > 0) {
         const queued = messageQueue.shift();
         postMessage({id: queued.data?.id, error: `Worker initialization failed: ${initError}`});
-      }
     }
 }
 

frontend/core/navigation/src/commonMain/kotlin/at/mocode/frontend/core/navigation/DeepLinkHandler.kt

@@ -22,10 +22,11 @@ class DeepLinkHandler(
 
   fun handleDeepLink(url: String): Boolean {
     val parsed = parseDeepLink(url) ?: return false
-    return processDeepLink(parsed)
+    processDeepLink(parsed)
+    return true
   }
 
-  private fun processDeepLink(deepLink: DeepLink): Boolean {
+  private fun processDeepLink(deepLink: DeepLink) {
     val route = cleanRoute(deepLink.route)
 
     // If the route requires auth and the user is missing → redirect to log in
@@ -33,20 +34,19 @@ class DeepLinkHandler(
       val user = currentUserProvider.getCurrentUser()
       if (user == null) {
         navigation.navigateTo(config.loginRoute)
-        return true
+        return
       }
       // Admin section guard: requires ADMIN role
       if (requiresAdmin(route)) {
         val isAdmin = user.roles.contains(AppRoles.ADMIN)
         if (!isAdmin) {
           navigation.navigateTo(Routes.HOME)
-          return true
+          return
         }
       }
     }
 
     navigation.navigateTo(deepLink.route)
-    return true
   }
 
   private fun parseDeepLink(url: String): DeepLink? {
@@ -62,7 +62,7 @@ class DeepLinkHandler(
     val parts = withoutScheme.split("/")
     if (parts.isEmpty() || parts[0] != config.host) return null
     val path = "/" + parts.drop(1).joinToString("/")
-    val route = if (path.isBlank()) Routes.HOME else path
+    val route = path.ifBlank { Routes.HOME }
     return DeepLink(DeepLinkType.CUSTOM_SCHEME, route, url)
   }
 
@@ -86,7 +86,4 @@ class DeepLinkHandler(
   }
 
   private fun requiresAdmin(route: String): Boolean = route.startsWith("${Routes.Admin.ROOT}/")
-
-  fun generateDeepLink(route: String, useCustomScheme: Boolean = true): String =
-    if (useCustomScheme) "${config.scheme}://${config.host}$route" else "https://${config.allowedDomains.first()}$route"
 }