Dictionary database worker refactoring (#1913)

* Rename DictionaryWorker => DictionaryWorkerHandler

* Rename var

* Rename file

* Simplify

* Rename DictionaryDatabaseModifier => DictionaryWorker

* Rename dictionary-database-modifier.js => dictionary-worker.js

6 files changed, 186 insertions, 188 deletions

diff --git a/ext/js/language/dictionary-database-modifier.js b/ext/js/language/dictionary-database-modifier.js
deleted file mode 100644
index 055c4769..00000000
--- a/ext/js/language/dictionary-database-modifier.js
+++ /dev/null
@@ -1,130 +0,0 @@
-/*
- * 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
- * DictionaryImporterMediaLoader
- */
-
-class DictionaryDatabaseModifier {
-    constructor() {
-        this._dictionaryImporterMediaLoader = new DictionaryImporterMediaLoader();
-    }
-
-    importDictionary(archiveContent, details, onProgress) {
-        return this._invoke(
-            'importDictionary',
-            {details, archiveContent},
-            [archiveContent],
-            onProgress,
-            this._formatimportDictionaryResult.bind(this)
-        );
-    }
-
-    deleteDictionary(dictionaryTitle, onProgress) {
-        return this._invoke('deleteDictionary', {dictionaryTitle}, [], onProgress);
-    }
-
-    // Private
-
-    _invoke(action, params, transfer, onProgress, formatResult) {
-        return new Promise((resolve, reject) => {
-            const worker = new Worker('/js/language/dictionary-worker-main.js', {});
-            const details = {
-                complete: false,
-                worker,
-                resolve,
-                reject,
-                onMessage: null,
-                onProgress,
-                formatResult
-            };
-            const onMessage = this._onMessage.bind(this, details);
-            details.onMessage = onMessage;
-            worker.addEventListener('message', onMessage);
-            worker.postMessage({action, params}, transfer);
-        });
-    }
-
-    _onMessage(details, e) {
-        if (details.complete) { return; }
-        const {action, params} = e.data;
-        switch (action) {
-            case 'complete':
-                {
-                    const {worker, resolve, reject, onMessage, formatResult} = details;
-                    details.complete = true;
-                    details.worker = null;
-                    details.resolve = null;
-                    details.reject = null;
-                    details.onMessage = null;
-                    details.onProgress = null;
-                    details.formatResult = null;
-                    worker.removeEventListener('message', onMessage);
-                    worker.terminate();
-                    this._onMessageComplete(params, resolve, reject, formatResult);
-                }
-                break;
-            case 'progress':
-                this._onMessageProgress(params, details.onProgress);
-                break;
-            case 'getImageResolution':
-                this._onMessageGetImageResolution(params, details.worker);
-                break;
-        }
-    }
-
-    _onMessageComplete(params, resolve, reject, formatResult) {
-        const {error} = params;
-        if (typeof error !== 'undefined') {
-            reject(deserializeError(error));
-        } else {
-            let {result} = params;
-            try {
-                if (typeof formatResult === 'function') {
-                    result = formatResult(result);
-                }
-            } catch (e) {
-                reject(e);
-                return;
-            }
-            resolve(result);
-        }
-    }
-
-    _onMessageProgress(params, onProgress) {
-        if (typeof onProgress !== 'function') { return; }
-        const {args} = params;
-        onProgress(...args);
-    }
-
-    async _onMessageGetImageResolution(params, worker) {
-        const {id, mediaType, content} = params;
-        let response;
-        try {
-            const result = await this._dictionaryImporterMediaLoader.getImageResolution(mediaType, content);
-            response = {id, result};
-        } catch (e) {
-            response = {id, error: serializeError(e)};
-        }
-        worker.postMessage({action: 'getImageResolution.response', params: response});
-    }
-
-    _formatimportDictionaryResult(result) {
-        result.errors = result.errors.map((error) => deserializeError(error));
-        return result;
-    }
-}
diff --git a/ext/js/language/dictionary-worker-handler.js b/ext/js/language/dictionary-worker-handler.js
new file mode 100644
index 00000000..88150f50
--- /dev/null
+++ b/ext/js/language/dictionary-worker-handler.js
@@ -0,0 +1,95 @@
+/*
+ * 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 DictionaryWorkerHandler {
+    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._onMessageWithProgress(params, this._importDictionary.bind(this));
+                break;
+            case 'deleteDictionary':
+                this._onMessageWithProgress(params, this._deleteDictionary.bind(this));
+                break;
+            case 'getImageResolution.response':
+                this._mediaLoader.handleMessage(params);
+                break;
+        }
+    }
+
+    async _onMessageWithProgress(params, handler) {
+        const onProgress = (...args) => {
+            self.postMessage({
+                action: 'progress',
+                params: {args}
+            });
+        };
+        let response;
+        try {
+            const result = await handler(params, onProgress);
+            response = {result};
+        } catch (e) {
+            response = {error: serializeError(e)};
+        }
+        self.postMessage({action: 'complete', params: response});
+    }
+
+    async _importDictionary({details, archiveContent}, onProgress) {
+        const dictionaryDatabase = await this._getPreparedDictionaryDatabase();
+        try {
+            const dictionaryImporter = new DictionaryImporter(this._mediaLoader, onProgress);
+            const {result, errors} = await dictionaryImporter.importDictionary(dictionaryDatabase, archiveContent, details);
+            return {
+                result,
+                errors: errors.map((error) => serializeError(error))
+            };
+        } finally {
+            dictionaryDatabase.close();
+        }
+    }
+
+    async _deleteDictionary({dictionaryTitle}, onProgress) {
+        const dictionaryDatabase = await this._getPreparedDictionaryDatabase();
+        try {
+            return await dictionaryDatabase.deleteDictionary(dictionaryTitle, {rate: 1000}, onProgress);
+        } finally {
+            dictionaryDatabase.close();
+        }
+    }
+
+    async _getPreparedDictionaryDatabase() {
+        const dictionaryDatabase = new DictionaryDatabase();
+        await dictionaryDatabase.prepare();
+        return dictionaryDatabase;
+    }
+}
diff --git a/ext/js/language/dictionary-worker-main.js b/ext/js/language/dictionary-worker-main.js
index e113b568..fbeaea1e 100644
--- a/ext/js/language/dictionary-worker-main.js
+++ b/ext/js/language/dictionary-worker-main.js
@@ -16,7 +16,7 @@
  */
 
 /* global
- * DictionaryWorker
+ * DictionaryWorkerHandler
  */
 
 self.importScripts(
@@ -27,15 +27,15 @@ self.importScripts(
     '/js/general/cache-map.js',
     '/js/language/dictionary-database.js',
     '/js/language/dictionary-importer.js',
-    '/js/language/dictionary-worker.js',
+    '/js/language/dictionary-worker-handler.js',
     '/js/language/dictionary-worker-media-loader.js',
     '/js/media/media-util.js'
 );
 
 (() => {
     try {
-        const dictionaryImporterWorker = new DictionaryWorker();
-        dictionaryImporterWorker.prepare();
+        const dictionaryWorkerHandler = new DictionaryWorkerHandler();
+        dictionaryWorkerHandler.prepare();
     } catch (e) {
         log.error(e);
     }
diff --git a/ext/js/language/dictionary-worker.js b/ext/js/language/dictionary-worker.js
index dc546657..4adfdaec 100644
--- a/ext/js/language/dictionary-worker.js
+++ b/ext/js/language/dictionary-worker.js
@@ -16,80 +16,115 @@
  */
 
 /* global
- * DictionaryDatabase
- * DictionaryImporter
- * DictionaryWorkerMediaLoader
+ * DictionaryImporterMediaLoader
  */
 
 class DictionaryWorker {
     constructor() {
-        this._mediaLoader = new DictionaryWorkerMediaLoader();
+        this._dictionaryImporterMediaLoader = new DictionaryImporterMediaLoader();
     }
 
-    prepare() {
-        self.addEventListener('message', this._onMessage.bind(this), false);
+    importDictionary(archiveContent, details, onProgress) {
+        return this._invoke(
+            'importDictionary',
+            {details, archiveContent},
+            [archiveContent],
+            onProgress,
+            this._formatimportDictionaryResult.bind(this)
+        );
+    }
+
+    deleteDictionary(dictionaryTitle, onProgress) {
+        return this._invoke('deleteDictionary', {dictionaryTitle}, [], onProgress);
     }
 
     // Private
 
-    _onMessage(e) {
+    _invoke(action, params, transfer, onProgress, formatResult) {
+        return new Promise((resolve, reject) => {
+            const worker = new Worker('/js/language/dictionary-worker-main.js', {});
+            const details = {
+                complete: false,
+                worker,
+                resolve,
+                reject,
+                onMessage: null,
+                onProgress,
+                formatResult
+            };
+            const onMessage = this._onMessage.bind(this, details);
+            details.onMessage = onMessage;
+            worker.addEventListener('message', onMessage);
+            worker.postMessage({action, params}, transfer);
+        });
+    }
+
+    _onMessage(details, e) {
+        if (details.complete) { return; }
         const {action, params} = e.data;
         switch (action) {
-            case 'importDictionary':
-                this._onMessageWithProgress(params, this._importDictionary.bind(this));
+            case 'complete':
+                {
+                    const {worker, resolve, reject, onMessage, formatResult} = details;
+                    details.complete = true;
+                    details.worker = null;
+                    details.resolve = null;
+                    details.reject = null;
+                    details.onMessage = null;
+                    details.onProgress = null;
+                    details.formatResult = null;
+                    worker.removeEventListener('message', onMessage);
+                    worker.terminate();
+                    this._onMessageComplete(params, resolve, reject, formatResult);
+                }
                 break;
-            case 'deleteDictionary':
-                this._onMessageWithProgress(params, this._deleteDictionary.bind(this));
+            case 'progress':
+                this._onMessageProgress(params, details.onProgress);
                 break;
-            case 'getImageResolution.response':
-                this._mediaLoader.handleMessage(params);
+            case 'getImageResolution':
+                this._onMessageGetImageResolution(params, details.worker);
                 break;
         }
     }
 
-    async _onMessageWithProgress(params, handler) {
-        const onProgress = (...args) => {
-            self.postMessage({
-                action: 'progress',
-                params: {args}
-            });
-        };
-        let response;
-        try {
-            const result = await handler(params, onProgress);
-            response = {result};
-        } catch (e) {
-            response = {error: serializeError(e)};
+    _onMessageComplete(params, resolve, reject, formatResult) {
+        const {error} = params;
+        if (typeof error !== 'undefined') {
+            reject(deserializeError(error));
+        } else {
+            let {result} = params;
+            try {
+                if (typeof formatResult === 'function') {
+                    result = formatResult(result);
+                }
+            } catch (e) {
+                reject(e);
+                return;
+            }
+            resolve(result);
         }
-        self.postMessage({action: 'complete', params: response});
     }
 
-    async _importDictionary({details, archiveContent}, onProgress) {
-        const dictionaryDatabase = await this._getPreparedDictionaryDatabase();
-        try {
-            const dictionaryImporter = new DictionaryImporter(this._mediaLoader, onProgress);
-            const {result, errors} = await dictionaryImporter.importDictionary(dictionaryDatabase, archiveContent, details);
-            return {
-                result,
-                errors: errors.map((error) => serializeError(error))
-            };
-        } finally {
-            dictionaryDatabase.close();
-        }
+    _onMessageProgress(params, onProgress) {
+        if (typeof onProgress !== 'function') { return; }
+        const {args} = params;
+        onProgress(...args);
     }
 
-    async _deleteDictionary({dictionaryTitle}, onProgress) {
-        const dictionaryDatabase = await this._getPreparedDictionaryDatabase();
+    async _onMessageGetImageResolution(params, worker) {
+        const {id, mediaType, content} = params;
+        let response;
         try {
-            return await dictionaryDatabase.deleteDictionary(dictionaryTitle, {rate: 1000}, onProgress);
-        } finally {
-            dictionaryDatabase.close();
+            const result = await this._dictionaryImporterMediaLoader.getImageResolution(mediaType, content);
+            response = {id, result};
+        } catch (e) {
+            response = {id, error: serializeError(e)};
         }
+        worker.postMessage({action: 'getImageResolution.response', params: response});
     }
 
-    async _getPreparedDictionaryDatabase() {
-        const dictionaryDatabase = new DictionaryDatabase();
-        await dictionaryDatabase.prepare();
-        return dictionaryDatabase;
+    _formatimportDictionaryResult(result) {
+        result.errors = result.errors.map((error) => deserializeError(error));
+        return result;
     }
 }
diff --git a/ext/js/pages/settings/dictionary-controller.js b/ext/js/pages/settings/dictionary-controller.js
index a041e791..2a44f9ad 100644
--- a/ext/js/pages/settings/dictionary-controller.js
+++ b/ext/js/pages/settings/dictionary-controller.js
@@ -16,7 +16,7 @@
  */
 
 /* global
- * DictionaryDatabaseModifier
+ * DictionaryWorker
  */
 
 class DictionaryEntry {
@@ -679,8 +679,7 @@ class DictionaryController {
     }
 
     async _deleteDictionaryInternal(dictionaryTitle, onProgress) {
-        const dictionaryDatabaseModifier = new DictionaryDatabaseModifier();
-        await dictionaryDatabaseModifier.deleteDictionary(dictionaryTitle, onProgress);
+        await new DictionaryWorker().deleteDictionary(dictionaryTitle, onProgress);
         yomichan.api.triggerDatabaseUpdated('dictionary', 'delete');
     }
 
diff --git a/ext/js/pages/settings/dictionary-import-controller.js b/ext/js/pages/settings/dictionary-import-controller.js
index 2716756d..b6700c78 100644
--- a/ext/js/pages/settings/dictionary-import-controller.js
+++ b/ext/js/pages/settings/dictionary-import-controller.js
@@ -17,7 +17,7 @@
 
 /* global
  * DictionaryController
- * DictionaryDatabaseModifier
+ * DictionaryWorker
  */
 
 class DictionaryImportController {
@@ -213,8 +213,7 @@ class DictionaryImportController {
 
     async _importDictionary(file, importDetails, onProgress) {
         const archiveContent = await this._readFile(file);
-        const dictionaryDatabaseModifier = new DictionaryDatabaseModifier();
-        const {result, errors} = await dictionaryDatabaseModifier.importDictionary(archiveContent, importDetails, onProgress);
+        const {result, errors} = await new DictionaryWorker().importDictionary(archiveContent, importDetails, onProgress);
         yomichan.api.triggerDatabaseUpdated('dictionary', 'import');
         const errors2 = await this._addDictionarySettings(result.sequenced, result.title);