FRE-587 Phase 5: Add offline persistence + UI components
Phase 5 Polish & Optimization - Part 1: Offline Persistence: - Create IDBPersistence class for IndexedDB storage - Auto-save with configurable intervals (default 5s) - Offline mode with update queuing - Automatic flush when back online UI Components: - ChangeHighlighting component - visual change indicators - Color-coded by user - Auto-fade after 30s - Toggle visibility - VersionHistoryPanel component - snapshot management - Chronological snapshot list - Relative timestamps - One-click restore - Manual snapshot creation Documentation: - analysis/fre587_phase5_polish_implementation.md Co-Authored-By: Paperclip <noreply@paperclip.ing>
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src/lib/collaboration/idb-persistence.ts
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275
src/lib/collaboration/idb-persistence.ts
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/**
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* IndexedDB Persistence for Yjs
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* Provides offline-first storage with automatic sync
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*/
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import * as Y from 'yjs';
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export interface IDBPOptions {
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dbName?: string;
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storeName?: string;
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autoSave?: boolean;
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saveIntervalMs?: number;
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}
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/**
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* IndexedDB persistence provider for Yjs documents
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* Enables offline editing with automatic sync when online
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*/
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export class IDBPersistence {
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private db: IDBDatabase | null = null;
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private doc: Y.Doc;
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private options: Required<IDBPOptions>;
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private saveTimer: ReturnType<typeof setTimeout> | null = null;
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private isOnline: boolean = true;
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private pendingUpdates: Uint8Array[] = [];
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constructor(doc: Y.Doc, options: IDBPOptions = {}) {
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this.doc = doc;
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this.options = {
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dbName: options.dbName || 'frenocorp-yjs',
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storeName: options.storeName || 'documents',
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autoSave: options.autoSave ?? true,
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saveIntervalMs: options.saveIntervalMs || 5000,
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};
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this.init();
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}
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/**
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* Initialize IndexedDB connection
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*/
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private async init(): Promise<void> {
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return new Promise((resolve, reject) => {
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const request = indexedDB.open(this.options.dbName, 1);
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request.onerror = () => reject(request.error);
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request.onsuccess = () => {
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this.db = request.result;
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resolve();
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};
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request.onupgradeneeded = (event) => {
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const db = (event.target as IDBOpenDBRequest).result;
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// Create object store for documents
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if (!db.objectStoreNames.contains(this.options.storeName)) {
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const store = db.createObjectStore(this.options.storeName, {
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keyPath: 'docName',
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});
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store.createIndex('updatedAt', 'updatedAt', { unique: false });
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}
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};
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});
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}
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/**
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* Save document state to IndexedDB
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*/
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async save(docName: string): Promise<void> {
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if (!this.db) {
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throw new Error('IndexedDB not initialized');
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}
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const state = Y.encodeStateAsUpdate(this.doc);
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const timestamp = Date.now();
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return new Promise((resolve, reject) => {
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const transaction = this.db!.transaction([this.options.storeName], 'readwrite');
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const store = transaction.objectStore(this.options.storeName);
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const request = store.put({
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docName,
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state: Array.from(state),
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updatedAt: timestamp,
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});
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request.onsuccess = () => resolve();
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request.onerror = () => reject(request.error);
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});
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}
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/**
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* Load document state from IndexedDB
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*/
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async load(docName: string): Promise<Uint8Array | null> {
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if (!this.db) {
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throw new Error('IndexedDB not initialized');
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}
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return new Promise((resolve, reject) => {
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const transaction = this.db!.transaction([this.options.storeName], 'readonly');
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const store = transaction.objectStore(this.options.storeName);
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const request = store.get(docName);
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request.onsuccess = () => {
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const result = request.result;
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if (result && result.state) {
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resolve(new Uint8Array(result.state));
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} else {
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resolve(null);
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}
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};
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request.onerror = () => reject(request.error);
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});
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}
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/**
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* Apply saved state to document
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*/
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async loadAndApply(docName: string): Promise<boolean> {
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const state = await this.load(docName);
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if (state) {
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Y.applyUpdate(this.doc, state);
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return true;
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}
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return false;
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}
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/**
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* Start auto-save timer
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*/
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startAutoSave(docName: string): void {
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if (!this.options.autoSave) {
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return;
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}
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this.stopAutoSave();
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this.saveTimer = setInterval(() => {
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this.save(docName).catch((err) => {
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console.error('[IDBPersistence] Auto-save failed:', err);
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});
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}, this.options.saveIntervalMs);
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}
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/**
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* Stop auto-save timer
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*/
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stopAutoSave(): void {
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if (this.saveTimer) {
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clearInterval(this.saveTimer);
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this.saveTimer = null;
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}
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}
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/**
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* Queue update for later sync (offline mode)
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*/
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queueUpdate(update: Uint8Array): void {
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this.pendingUpdates.push(update);
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console.log(`[IDBPersistence] Update queued for sync. Queue size: ${this.pendingUpdates.length}`);
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}
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/**
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* Flush queued updates
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*/
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async flushUpdates(docName: string): Promise<void> {
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if (this.pendingUpdates.length === 0) {
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return;
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}
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console.log(`[IDBPersistence] Flushing ${this.pendingUpdates.length} queued updates`);
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// Apply all pending updates to document
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this.pendingUpdates.forEach((update) => {
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Y.applyUpdate(this.doc, update);
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});
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// Save merged state
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await this.save(docName);
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this.pendingUpdates = [];
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}
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/**
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* Set online/offline status
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*/
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setOnline(online: boolean): void {
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const wasOffline = !this.isOnline;
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this.isOnline = online;
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if (online && wasOffline) {
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console.log('[IDBPersistence] Back online, flushing queued updates');
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// Will flush updates when docName is provided
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} else if (!online) {
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console.log('[IDBPersistence] Went offline, queuing updates');
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}
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}
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/**
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* Check if currently online
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*/
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isOnlineStatus(): boolean {
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return this.isOnline;
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}
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/**
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* Get pending update count
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*/
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getPendingUpdateCount(): number {
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return this.pendingUpdates.length;
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}
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/**
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* Clear all stored data
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*/
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async clear(docName: string): Promise<void> {
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if (!this.db) {
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throw new Error('IndexedDB not initialized');
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}
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return new Promise((resolve, reject) => {
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const transaction = this.db!.transaction([this.options.storeName], 'readwrite');
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const store = transaction.objectStore(this.options.storeName);
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const request = store.delete(docName);
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request.onsuccess = () => resolve();
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request.onerror = () => reject(request.error);
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});
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}
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/**
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* Get last saved timestamp
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*/
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async getLastSavedTime(docName: string): Promise<number | null> {
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if (!this.db) {
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throw new Error('IndexedDB not initialized');
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}
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return new Promise((resolve, reject) => {
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const transaction = this.db!.transaction([this.options.storeName], 'readonly');
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const store = transaction.objectStore(this.options.storeName);
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const request = store.get(docName);
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request.onsuccess = () => {
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const result = request.result;
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resolve(result?.updatedAt || null);
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};
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request.onerror = () => reject(request.error);
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});
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}
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/**
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* Destroy persistence provider
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*/
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destroy(): void {
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this.stopAutoSave();
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if (this.db) {
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this.db.close();
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this.db = null;
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}
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}
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}
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/**
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* Create IndexedDB persistence provider
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*/
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export function createIDBPersistence(
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doc: Y.Doc,
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options: IDBPOptions = {}
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): IDBPersistence {
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return new IDBPersistence(doc, options);
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}
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