1 files changed, 21 insertions, 22 deletions

diff --git a/common/indexeddb.js b/common/indexeddb.js
index f916162..bdf71e5 100644
--- a/common/indexeddb.js
+++ b/common/indexeddb.js
@@ -99,9 +99,25 @@ async function idb_del(transaction, store_name, key)
     return wait_request(transaction.objectStore(store_name).delete(key));
 }
 
+async function perform_upgrade(event) {
+    const opened_db = event.target.result;
+
+    /* When we move to a new database schema, we will add upgrade logic here. */
+    if (event.oldVersion > 0)
+	throw "bad db version: " + event.oldVersion;
+
+    let store;
+    for (const [store_name, key_mode] of stores)
+	store = opened_db.createObjectStore(store_name, key_mode);
+
+    const ctx = make_context(store.transaction, initial_data.files);
+    await _save_items(initial_data.resources, initial_data.mappings, ctx);
+
+    return opened_db;
+}
+
 /* Open haketilo database, asynchronously return an IDBDatabase object. */
-async function get_db()
-{
+async function get_db() {
     if (db)
 	return db;
 
@@ -109,28 +125,11 @@ async function get_db()
     const waiter = new Promise((...cbs) => [resolve, reject] = cbs);
 
     const request = indexedDB.open("haketilo", version_nr(db_version));
-    request.onsuccess       = resolve;
+    request.onsuccess       = ev => resolve(ev.target.result);
     request.onerror         = ev => reject("db error: " + ev.target.errorCode);
-    request.onupgradeneeded = resolve;
-
-    const event = await waiter;
-    const opened_db = event.target.result;
+    request.onupgradeneeded = ev => perform_upgrade(ev).then(resolve, reject);
 
-    if (event instanceof IDBVersionChangeEvent) {
-	/*
-	 * When we move to a new database schema, we will add upgrade logic
-	 * here.
-	 */
-	if (event.oldVersion > 0)
-	    throw "bad db version: " + event.oldVersion;
-
-	let store;
-	for (const [store_name, key_mode] of stores)
-	    store = opened_db.createObjectStore(store_name, key_mode);
-
-	const ctx = make_context(store.transaction, initial_data.files);
-	await _save_items(initial_data.resources, initial_data.mappings, ctx);
-    }
+    const opened_db = await waiter;
 
     if (db)
 	opened_db.close();