refactor: workspace provider (#2218)

packages/y-indexeddb/README.md

@@ -1,18 +1,24 @@
 # @toeverything/y-indexeddb
 
-> This package haven't been published yet.
-
 ## Usage
 
 ```ts
-import { createIndexedDBProvider } from '@toeverything/y-indexeddb';
+import { createIndexedDBProvider, downloadBinary } from '@toeverything/y-indexeddb';
 import * as Y from 'yjs';
 const yDoc = new Y.Doc();
 
+// sync yDoc with indexedDB
 const provider = createIndexedDBProvider('docName', yDoc);
 provider.connect();
 await provider.whenSynced.then(() => {
   console.log('synced');
   provider.disconnect();
 });
+
+// dowload binary data from indexedDB for once
+downloadBinary('docName').then(blob => {
+  if (blob !== false) {
+    Y.applyUpdate(yDoc, blob);
+  }
+});
 ```

packages/y-indexeddb/src/__tests__/index.spec.ts

@@ -340,7 +340,10 @@ describe('utils', () => {
     provider.connect();
     await provider.whenSynced;
     provider.disconnect();
-    const update = await downloadBinary(workspace.id, rootDBName);
+    const update = (await downloadBinary(
+      workspace.id,
+      rootDBName
+    )) as Uint8Array;
     expect(update).toBeInstanceOf(Uint8Array);
     const newWorkspace = new Workspace({
       id,

packages/y-indexeddb/src/utils.ts

@@ -129,7 +129,7 @@ export async function tryMigrate(
 export async function downloadBinary(
   id: string,
   dbName = DEFAULT_DB_NAME
-): Promise<UpdateMessage['update']> {
+): Promise<UpdateMessage['update'] | false> {
   const dbPromise = openDB<BlockSuiteBinaryDB>(dbName, dbVersion, {
     upgrade: upgradeDB,
   });
@@ -137,7 +137,7 @@ export async function downloadBinary(
   const t = db.transaction('workspace', 'readonly').objectStore('workspace');
   const doc = await t.get(id);
   if (!doc) {
-    return new Uint8Array(0);
+    return false;
   } else {
     return mergeUpdates(doc.updates.map(({ update }) => update));
   }