fix: merge two empty doc, no udpate event trigger

packages/data-center/src/provider/affine/affine.ts

@@ -22,7 +22,7 @@ import {
   syncToCloud,
 } from './utils.js';
 import { WorkspaceUnit } from '../../workspace-unit.js';
-import { createBlocksuiteWorkspace } from '../../utils/index.js';
+import { createBlocksuiteWorkspace, applyUpdate } from '../../utils/index.js';
 import type { SyncMode } from '../../workspace-unit';
 
 type ChannelMessage = {
@@ -37,7 +37,7 @@ export interface AffineProviderConstructorParams
 }
 
 const {
-  Y: { applyUpdate, encodeStateAsUpdate },
+  Y: { encodeStateAsUpdate },
 } = BlocksuiteWorkspace;
 
 export class AffineProvider extends BaseProvider {
@@ -160,12 +160,7 @@ export class AffineProvider extends BaseProvider {
     const { doc, room: workspaceId } = blocksuiteWorkspace;
     assert(workspaceId, 'Blocksuite Workspace without room(workspaceId).');
     const updates = await this._apis.downloadWorkspace(workspaceId, published);
-    if (updates && updates.byteLength) {
-      await new Promise(resolve => {
-        doc.once('update', resolve);
-        BlocksuiteWorkspace.Y.applyUpdate(doc, new Uint8Array(updates));
-      });
-    }
+    await applyUpdate(blocksuiteWorkspace, new Uint8Array(updates));
   }
 
   override async loadPublicWorkspace(blocksuiteWorkspace: BlocksuiteWorkspace) {
@@ -368,16 +363,11 @@ export class AffineProvider extends BaseProvider {
     });
 
     const blocksuiteWorkspace = createBlocksuiteWorkspace(id);
-
-    await new Promise(resolve => {
     assert(workspaceUnit.blocksuiteWorkspace);
-      const doc = blocksuiteWorkspace.doc;
-      doc.once('update', resolve);
-      applyUpdate(
-        doc,
+    await applyUpdate(
+      blocksuiteWorkspace,
       encodeStateAsUpdate(workspaceUnit.blocksuiteWorkspace.doc)
     );
-    });
 
     await syncToCloud(blocksuiteWorkspace, this._apis.token.refresh);
 

packages/data-center/src/provider/affine/utils.ts

@@ -6,6 +6,7 @@ import { createBlocksuiteWorkspace } from '../../utils/index.js';
 import type { Apis } from './apis';
 import { WebsocketProvider } from './sync.js';
 import { setDefaultAvatar } from '../utils.js';
+import { applyUpdate } from '../../utils/index.js';
 
 export const loadWorkspaceUnit = async (
   params: WorkspaceUnitCtorParams,
@@ -18,13 +19,7 @@ export const loadWorkspaceUnit = async (
     workspaceUnit.id,
     params.published
   );
-  if (updates && updates.byteLength) {
-    await new Promise(resolve => {
-      const doc = blocksuiteWorkspace.doc;
-      doc.once('update', resolve);
-      BlocksuiteWorkspace.Y.applyUpdate(doc, new Uint8Array(updates));
-    });
-  }
+  applyUpdate(blocksuiteWorkspace, new Uint8Array(updates));
 
   const details = await apis.getWorkspaceDetail({ id: workspaceUnit.id });
   const owner = details?.owner;

packages/data-center/src/provider/local/indexeddb/utils.ts

@@ -1,9 +1,9 @@
 import assert from 'assert';
 import * as idb from 'lib0/indexeddb.js';
 import { Workspace as BlocksuiteWorkspace } from '@blocksuite/store';
+import { applyUpdate } from '../../../utils/index.js';
 
-const { applyUpdate, encodeStateAsUpdate, mergeUpdates } =
-  BlocksuiteWorkspace.Y;
+const { encodeStateAsUpdate, mergeUpdates } = BlocksuiteWorkspace.Y;
 
 export const writeUpdatesToLocal = async (
   blocksuiteWorkspace: BlocksuiteWorkspace
@@ -34,12 +34,8 @@ export const applyLocalUpdates = async (
   const [updatesStore] = idb.transact(db, ['updates']); // , 'readonly')
   if (updatesStore) {
     const updates = await idb.getAll(updatesStore);
-    const doc = blocksuiteWorkspace.doc;
-    await new Promise(resolve => {
     const mergedUpdates = mergeUpdates(updates);
-      doc.once('update', resolve);
-      applyUpdate(doc, mergedUpdates);
-    });
+    await applyUpdate(blocksuiteWorkspace, mergedUpdates);
   }
   return blocksuiteWorkspace;
 };

packages/data-center/src/utils/index.ts

@@ -45,3 +45,25 @@ export async function getDefaultHeadImgBlob(
     }
   });
 }
+
+export const applyUpdate = async (
+  blocksuiteWorkspace: BlocksuiteWorkspace,
+  updates: Uint8Array
+) => {
+  if (updates && updates.byteLength) {
+    await new Promise(resolve => {
+      // FIXME: if we merge two empty doc, there will no update event.
+      // So we set a timer to cancel update listener.
+      const doc = blocksuiteWorkspace.doc;
+      const timer = setTimeout(() => {
+        doc.off('update', resolve);
+        resolve(undefined);
+      }, 1000);
+      doc.once('update', () => {
+        clearTimeout(timer);
+        setTimeout(resolve, 100);
+      });
+      BlocksuiteWorkspace.Y.applyUpdate(doc, new Uint8Array(updates));
+    });
+  }
+};