initial add to util

Author: hsubox76

packages/util/src/indexeddb.ts

@@ -0,0 +1,79 @@
+/**
+ * @license
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Store db open promises for each db name/version combo to prevent
+ * multiple attempts at opening the same db.
+ */
+const dbPromises: Record<string, Promise<IDBDatabase>> = {};
+
+export function openDB(
+  dbName: string,
+  dbVersion: number,
+  upgradeCallback: (event: IDBVersionChangeEvent) => void
+): Promise<IDBDatabase> {
+  const dbPromiseKey = dbName + dbVersion;
+  if (dbPromises[dbPromiseKey] != null) {
+    return dbPromises[dbPromiseKey];
+  }
+  dbPromises[dbPromiseKey] = new Promise((resolve, reject) => {
+    try {
+      const request = indexedDB.open(dbName, dbVersion);
+
+      request.onsuccess = event => {
+        resolve((event.target as IDBOpenDBRequest).result);
+      };
+
+      request.onerror = event => {
+        reject(
+          `Error opening indexedDB: ${
+            (event.target as IDBRequest).error?.message
+          }`
+        );
+      };
+
+      request.onupgradeneeded = event => {
+        upgradeCallback(event);
+      };
+    } catch (e) {
+      reject(`Error opening indexedDB: ${e.message}`);
+    }
+  });
+  return dbPromises[dbPromiseKey];
+}
+
+export async function deleteDB(dbName: string): Promise<void> {
+  return new Promise((resolve, reject) => {
+    try {
+      const request = indexedDB.deleteDatabase(dbName);
+
+      request.onsuccess = () => {
+        resolve();
+      };
+
+      request.onerror = event => {
+        reject(
+          `Error deleting indexedDB database "${dbName}": ${
+            (event.target as IDBRequest).error?.message
+          }`
+        );
+      };
+    } catch (e) {
+      reject(`Error deleting indexedDB database "${dbName}": ${e.message}`);
+    }
+  });
+}