gallery optimizations

javascript/indexdb.js

@@ -0,0 +1,83 @@
+let db;
+
+async function initIndexDB() {
+  async function createDB() {
+    return new Promise((resolve, reject) => {
+      const request = indexedDB.open('SDNext');
+      request.onerror = (evt) => reject(evt);
+      request.onsuccess = (evt) => {
+        db = evt.target.result;
+        const countAll = db
+          .transaction(['thumbs'], 'readwrite')
+          .objectStore('thumbs')
+          .count();
+        countAll.onsuccess = () => log('initIndexDB', countAll.result);
+        resolve();
+      };
+      request.onupgradeneeded = (evt) => {
+        db = evt.target.result;
+        const store = db.createObjectStore('thumbs', { keyPath: 'hash' });
+        store.createIndex('hash', 'hash', { unique: true });
+        const index = store.index('hash');
+        resolve();
+      };
+    });
+  }
+
+  if (!db) await createDB();
+}
+
+async function add(record) {
+  if (!db) return null;
+  return new Promise((resolve, reject) => {
+    const request = db
+      .transaction(['thumbs'], 'readwrite')
+      .objectStore('thumbs')
+      .add(record);
+    request.onsuccess = (evt) => resolve(evt);
+    request.onerror = (evt) => reject(evt);
+  });
+}
+
+async function del(hash) {
+  if (!db) return null;
+  return new Promise((resolve, reject) => {
+    const request = db
+      .transaction(['thumbs'], 'readwrite')
+      .objectStore('thumbs')
+      .delete(hash);
+    request.onsuccess = (evt) => resolve(evt);
+    request.onerror = (evt) => reject(evt);
+  });
+}
+
+async function get(hash) {
+  if (!db) return null;
+  return new Promise((resolve, reject) => {
+    const request = db
+      .transaction(['thumbs'], 'readwrite')
+      .objectStore('thumbs')
+      .get(hash);
+    request.onsuccess = () => resolve(request.result);
+    request.onerror = (evt) => reject(evt);
+  });
+}
+
+async function put(record) {
+  if (!db) return null;
+  return new Promise((resolve, reject) => {
+    const request = db
+      .transaction(['thumbs'], 'readwrite')
+      .objectStore('thumbs')
+      .put(record);
+    request.onsuccess = (evt) => resolve(evt);
+    request.onerror = (evt) => reject(evt);
+  });
+}
+
+window.idbAdd = add;
+window.idbDel = del;
+window.idbGet = get;
+window.idbPut = put;
+
+onUiLoaded(initIndexDB);