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adapters/indexeddb.mjs

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+// Web-standard storage adapter. Schema version is independent of Gecko version.
+export class IndexedDBStorage {
+  constructor(database) {
+    this.database = database;
+  }
+  static open(name = 'vulpes-services-v1') {
+    return new Promise((resolve, reject) => {
+      const req = indexedDB.open(name, 1);
+      req.onupgradeneeded = () => req.result.createObjectStore('settings');
+      req.onsuccess = () => {
+        const db = req.result;
+        db.onversionchange = () => db.close();
+        resolve(new IndexedDBStorage(db));
+      };
+      req.onerror = () => reject(req.error);
+      req.onblocked = () => reject(new Error('DATABASE_BLOCKED'));
+    });
+  }
+  get(key) {
+    return new Promise((resolve, reject) => {
+      const tx = this.database.transaction('settings', 'readonly');
+      const req = tx.objectStore('settings').get(key);
+      tx.oncomplete = () => resolve(req.result);
+      tx.onabort = () => reject(tx.error);
+    });
+  }
+  setMany(entries) {
+    return new Promise((resolve, reject) => {
+      const tx = this.database.transaction('settings', 'readwrite');
+      tx.oncomplete = () => resolve();
+      tx.onabort = () => reject(tx.error);
+      const store = tx.objectStore('settings');
+      for (const [key, value] of entries) store.put(value, key);
+    });
+  }
+  close() {
+    this.database.close();
+  }
+}