Dictionary worker refactor (#1894)

* Rename dictionary worker files

* Rename classes

* Rename file

* Rename class

* Generalize the _invoke method

* Rename 'import' to 'importDictionary'

* Improve DictionaryImporterMediaLoader usage

* Refactor message handler

* Generalize onProgress event

1 files changed, 83 insertions, 0 deletions

diff --git a/ext/js/language/dictionary-worker.js b/ext/js/language/dictionary-worker.js
new file mode 100644
index 00000000..5c482178
--- /dev/null
+++ b/ext/js/language/dictionary-worker.js
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2021  Yomichan Authors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/* global
+ * DictionaryDatabase
+ * DictionaryImporter
+ * DictionaryWorkerMediaLoader
+ */
+
+class DictionaryWorker {
+    constructor() {
+        this._mediaLoader = new DictionaryWorkerMediaLoader();
+    }
+
+    prepare() {
+        self.addEventListener('message', this._onMessage.bind(this), false);
+    }
+
+    // Private
+
+    _onMessage(e) {
+        const {action, params} = e.data;
+        switch (action) {
+            case 'importDictionary':
+                this._onImportDictionary(params);
+                break;
+            case 'getImageResolution.response':
+                this._mediaLoader.handleMessage(params);
+                break;
+        }
+    }
+
+    async _onImportDictionary({details, archiveContent}) {
+        const onProgress = (...args) => {
+            self.postMessage({
+                action: 'progress',
+                params: {args}
+            });
+        };
+        let response;
+        try {
+            const result = await this._importDictionary(archiveContent, details, onProgress);
+            response = {result};
+        } catch (e) {
+            response = {error: serializeError(e)};
+        }
+        self.postMessage({action: 'complete', params: response});
+    }
+
+    async _importDictionary(archiveContent, importDetails, onProgress) {
+        const dictionaryDatabase = await this._getPreparedDictionaryDatabase();
+        try {
+            const dictionaryImporter = new DictionaryImporter(this._mediaLoader, onProgress);
+            const {result, errors} = await dictionaryImporter.importDictionary(dictionaryDatabase, archiveContent, importDetails);
+            return {
+                result,
+                errors: errors.map((error) => serializeError(error))
+            };
+        } finally {
+            dictionaryDatabase.close();
+        }
+    }
+
+    async _getPreparedDictionaryDatabase() {
+        const dictionaryDatabase = new DictionaryDatabase();
+        await dictionaryDatabase.prepare();
+        return dictionaryDatabase;
+    }
+}