switch to nx monorepo

apps/server/src/collaboration/extensions/persistence.extension.ts

@@ -0,0 +1,68 @@
+import {
+  Extension,
+  onLoadDocumentPayload,
+  onStoreDocumentPayload,
+} from '@hocuspocus/server';
+import * as Y from 'yjs';
+import { PageService } from '../../core/page/services/page.service';
+import { Injectable } from '@nestjs/common';
+import { TiptapTransformer } from '@hocuspocus/transformer';
+
+@Injectable()
+export class PersistenceExtension implements Extension {
+  constructor(private readonly pageService: PageService) {}
+
+  async onLoadDocument(data: onLoadDocumentPayload) {
+    const { documentName, document } = data;
+    const pageId = documentName;
+
+    if (!document.isEmpty('default')) {
+      return;
+    }
+
+    const page = await this.pageService.findWithAllFields(pageId);
+
+    if (!page) {
+      console.log('page does not exist.');
+      //TODO: terminate connection if the page does not exist?
+      return;
+    }
+
+    if (page.ydoc) {
+      console.log('ydoc loaded from db');
+
+      const doc = new Y.Doc();
+      const dbState = new Uint8Array(page.ydoc);
+
+      Y.applyUpdate(doc, dbState);
+      return doc;
+    }
+
+    // if no ydoc state in db convert json in page.content to Ydoc.
+    if (page.content) {
+      console.log('converting json to ydoc');
+
+      const ydoc = TiptapTransformer.toYdoc(page.content, 'default');
+      Y.encodeStateAsUpdate(ydoc);
+      return ydoc;
+    }
+
+    console.log('creating fresh ydoc');
+    return new Y.Doc();
+  }
+
+  async onStoreDocument(data: onStoreDocumentPayload) {
+    const { documentName, document, context } = data;
+
+    const pageId = documentName;
+
+    const tiptapJson = TiptapTransformer.fromYdoc(document, 'default');
+    const ydocState = Buffer.from(Y.encodeStateAsUpdate(document));
+
+    try {
+      await this.pageService.updateState(pageId, tiptapJson, ydocState);
+    } catch (err) {
+      console.error(`Failed to update page ${documentName}`);
+    }
+  }
+}