From 2d5e6f839412985ae790da34b3f75476bcf8028c Mon Sep 17 00:00:00 2001
From: toasted-nutbread <toasted-nutbread@users.noreply.github.com>
Date: Sat, 7 Aug 2021 15:25:00 -0400
Subject: [PATCH] Fix data not being persisted after terminating Worker thread
 (#1877)

---
 ext/js/data/database.js                | 10 ++++++++++
 ext/js/language/dictionary-database.js |  4 ++++
 ext/js/language/dictionary-importer.js |  4 ++++
 3 files changed, 18 insertions(+)

diff --git a/ext/js/data/database.js b/ext/js/data/database.js
index a0a1804a..222e376c 100644
--- a/ext/js/data/database.js
+++ b/ext/js/data/database.js
@@ -198,6 +198,16 @@ class Database {
         });
     }
 
+    persistData(objectStoreName) {
+        return new Promise((resolve, reject) => {
+            const transaction = this.transaction([objectStoreName], 'readonly');
+            const objectStore = transaction.objectStore(objectStoreName);
+            const cursor = objectStore.openCursor();
+            cursor.onerror = (e) => reject(e.target.error);
+            cursor.onsuccess = () => resolve();
+        });
+    }
+
     static deleteDatabase(databaseName) {
         return new Promise((resolve, reject) => {
             const request = indexedDB.deleteDatabase(databaseName);
diff --git a/ext/js/language/dictionary-database.js b/ext/js/language/dictionary-database.js
index 6b235fb6..62300676 100644
--- a/ext/js/language/dictionary-database.js
+++ b/ext/js/language/dictionary-database.js
@@ -317,6 +317,10 @@ class DictionaryDatabase {
         return this._db.bulkAdd(objectStoreName, items, start, count);
     }
 
+    persistData(objectStoreName) {
+        return this._db.persistData(objectStoreName);
+    }
+
     // Private
 
     _findMultiBulk(objectStoreName, indexNames, items, createQuery, predicate, createResult) {
diff --git a/ext/js/language/dictionary-importer.js b/ext/js/language/dictionary-importer.js
index 89417ca6..8d6dcb33 100644
--- a/ext/js/language/dictionary-importer.js
+++ b/ext/js/language/dictionary-importer.js
@@ -149,6 +149,10 @@ class DictionaryImporter {
                 this._progressData.index += count;
                 this._progress();
             }
+
+            // This function is required in order to make the added data persist after the worker is terminated.
+            // https://bugs.chromium.org/p/chromium/issues/detail?id=1237686
+            await dictionaryDatabase.persistData(objectStoreName);
         };
 
         await bulkAdd('terms', termList);