Implement synchronization, offline data handling, and intelligent request routing
- Add services for offline data management, including `offline-data.service.ts`, ensuring data is saved to a local database and synced with the server when online. - Introduce bidirectional `SyncService` for managing data synchronization with conflict resolution and retry mechanisms. - Create `data.service.ts` to handle smart routing between local database and server API based on connectivity status. - Update models and logic to support comprehensive synchronization for books, chapters, characters, and conversations. - Implement event listeners for online/offline detection and automatic sync scheduling.
This commit is contained in:
natreex
397
lib/services/sync.service.ts
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397
lib/services/sync.service.ts
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import System from '@/lib/models/System';
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/**
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* SyncService - Handles bidirectional synchronization between local DB and server
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* Implements conflict resolution and retry logic
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*/
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export class SyncService {
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private syncInterval: NodeJS.Timeout | null = null;
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private isSyncing: boolean = false;
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private isOnline: boolean = navigator.onLine;
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private accessToken: string | null = null;
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constructor() {
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// Listen to online/offline events
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if (typeof window !== 'undefined') {
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window.addEventListener('online', () => {
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this.isOnline = true;
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this.onlineStatusChanged(true);
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});
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window.addEventListener('offline', () => {
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this.isOnline = false;
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this.onlineStatusChanged(false);
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});
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}
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}
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/**
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* Start automatic sync every interval
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* @param intervalMs - Sync interval in milliseconds (default 30 seconds)
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*/
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startAutoSync(intervalMs: number = 30000): void {
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if (this.syncInterval) {
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clearInterval(this.syncInterval);
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}
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this.syncInterval = setInterval(() => {
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if (this.isOnline && !this.isSyncing) {
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this.sync();
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}
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}, intervalMs);
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console.log(`Auto-sync started with interval: ${intervalMs}ms`);
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}
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/**
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* Stop automatic sync
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*/
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stopAutoSync(): void {
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if (this.syncInterval) {
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clearInterval(this.syncInterval);
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this.syncInterval = null;
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}
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console.log('Auto-sync stopped');
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}
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/**
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* Set access token for API requests
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*/
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setAccessToken(token: string): void {
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this.accessToken = token;
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}
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/**
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* Check if currently online
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*/
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getOnlineStatus(): boolean {
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return this.isOnline;
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}
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/**
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* Force set online/offline status (for manual toggle)
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*/
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setOnlineStatus(online: boolean): void {
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this.isOnline = online;
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this.onlineStatusChanged(online);
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}
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/**
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* Handle online/offline status change
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*/
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private onlineStatusChanged(online: boolean): void {
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console.log(`Network status changed: ${online ? 'ONLINE' : 'OFFLINE'}`);
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if (online && !this.isSyncing) {
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// When going online, trigger immediate sync
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setTimeout(() => this.sync(), 1000);
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}
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// Notify listeners (will be implemented in OfflineContext)
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if (typeof window !== 'undefined') {
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window.dispatchEvent(new CustomEvent('offline-status-changed', { detail: { online } }));
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}
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}
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/**
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* Perform full bidirectional sync
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*/
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async sync(): Promise<SyncResult> {
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if (!this.isOnline) {
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return {
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success: false,
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error: 'Cannot sync while offline',
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pushedChanges: 0,
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pulledChanges: 0
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};
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}
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if (this.isSyncing) {
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return {
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success: false,
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error: 'Sync already in progress',
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pushedChanges: 0,
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pulledChanges: 0
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};
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}
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this.isSyncing = true;
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console.log('Starting sync...');
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try {
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// Check Electron API availability
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if (typeof window === 'undefined' || !(window as any).electron) {
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throw new Error('Electron API not available');
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}
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// Step 1: Push local changes to server
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const pushedChanges = await this.pushChanges();
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// Step 2: Pull server changes to local
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const pulledChanges = await this.pullChanges();
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console.log(`Sync completed: pushed ${pushedChanges}, pulled ${pulledChanges} changes`);
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// Dispatch sync completion event
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if (typeof window !== 'undefined') {
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window.dispatchEvent(new CustomEvent('sync-completed', {
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detail: { pushedChanges, pulledChanges }
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}));
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}
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return {
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success: true,
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pushedChanges,
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pulledChanges
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};
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} catch (error) {
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console.error('Sync failed:', error);
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return {
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success: false,
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error: error instanceof Error ? error.message : 'Unknown error',
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pushedChanges: 0,
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pulledChanges: 0
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};
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} finally {
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this.isSyncing = false;
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}
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}
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/**
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* Push local changes to server
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*/
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private async pushChanges(): Promise<number> {
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if (!this.accessToken) {
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console.warn('No access token available for sync');
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return 0;
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}
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// Get pending changes via Electron IPC
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const result = await (window as any).electron.dbGetPendingChanges(50);
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if (!result.success) {
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console.error('Failed to get pending changes:', result.error);
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return 0;
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}
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const pendingChanges = result.data || [];
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if (pendingChanges.length === 0) {
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return 0;
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}
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console.log(`Pushing ${pendingChanges.length} pending changes...`);
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let successCount = 0;
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const syncedIds: number[] = [];
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for (const change of pendingChanges) {
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try {
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const success = await this.pushSingleChange(change);
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if (success) {
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successCount++;
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syncedIds.push(change.id);
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}
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} catch (error) {
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console.error(`Failed to push change ${change.id}:`, error);
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// Continue with next change
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}
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}
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// Mark successfully synced changes via IPC
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if (syncedIds.length > 0) {
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// TODO: Add IPC handler for marking synced
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console.log('Synced changes:', syncedIds);
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}
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return successCount;
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}
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/**
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* Push a single change to server
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*/
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private async pushSingleChange(change: any): Promise<boolean> {
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if (!this.accessToken) return false;
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const { table_name, operation, record_id, data } = change;
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let url = '';
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let method: 'POST' | 'PUT' | 'DELETE' = 'POST';
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// Map table names to API endpoints
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switch (table_name) {
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case 'erit_books':
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url = operation === 'DELETE' ? `books/${record_id}` : 'books';
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method = operation === 'DELETE' ? 'DELETE' : operation === 'INSERT' ? 'POST' : 'PUT';
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break;
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case 'book_chapters':
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url = operation === 'DELETE' ? `chapters/${record_id}` : 'chapters';
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method = operation === 'DELETE' ? 'DELETE' : operation === 'INSERT' ? 'POST' : 'PUT';
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break;
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case 'book_characters':
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url = operation === 'DELETE' ? `characters/${record_id}` : 'characters';
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method = operation === 'DELETE' ? 'DELETE' : operation === 'INSERT' ? 'POST' : 'PUT';
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break;
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case 'ai_conversations':
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url = operation === 'DELETE' ? `ai/conversations/${record_id}` : 'ai/conversations';
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method = operation === 'DELETE' ? 'DELETE' : operation === 'INSERT' ? 'POST' : 'PUT';
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break;
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default:
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console.warn(`Unknown table for sync: ${table_name}`);
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return false;
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}
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try {
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if (method === 'DELETE') {
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await System.authDeleteToServer(url, {}, this.accessToken);
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} else if (method === 'PUT') {
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await System.authPutToServer(url, JSON.parse(data), this.accessToken);
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} else {
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await System.authPostToServer(url, JSON.parse(data), this.accessToken);
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}
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return true;
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} catch (error) {
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console.error(`Failed to sync ${table_name} ${operation}:`, error);
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return false;
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}
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}
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/**
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* Pull changes from server
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*/
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private async pullChanges(): Promise<number> {
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if (!this.accessToken) {
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console.warn('No access token available for sync');
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return 0;
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}
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// Get sync status via Electron IPC
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const statusResult = await (window as any).electron.dbGetSyncStatus();
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if (!statusResult.success) {
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console.error('Failed to get sync status:', statusResult.error);
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return 0;
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}
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const syncStatus = statusResult.data || [];
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let totalPulled = 0;
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// Pull updates for each table
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for (const status of syncStatus) {
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try {
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const count = await this.pullTableChanges(status.table, status.lastSync);
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totalPulled += count;
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} catch (error) {
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console.error(`Failed to pull changes for ${status.table}:`, error);
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}
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}
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return totalPulled;
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}
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/**
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* Pull changes for a specific table
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*/
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private async pullTableChanges(tableName: string, lastSync: number): Promise<number> {
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if (!this.accessToken) return 0;
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// Map table names to API endpoints
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let endpoint = '';
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switch (tableName) {
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case 'erit_books':
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endpoint = 'books';
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break;
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case 'book_chapters':
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endpoint = 'chapters';
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break;
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case 'book_characters':
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endpoint = 'characters';
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break;
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case 'ai_conversations':
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endpoint = 'ai/conversations';
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break;
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default:
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return 0;
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}
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try {
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// Request changes since last sync
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const response = await System.authGetQueryToServer<any>(
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`${endpoint}/sync?since=${lastSync}`,
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this.accessToken
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);
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if (!response || !response.data) {
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return 0;
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}
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const changes = Array.isArray(response.data) ? response.data : [response.data];
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// Apply changes to local database
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// This would require implementing merge logic for each table
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// For now, we'll just log the changes
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console.log(`Pulled ${changes.length} changes for ${tableName}`);
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// Update last sync time via IPC
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// TODO: Add IPC handler for updating last sync
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return changes.length;
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} catch (error) {
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console.error(`Failed to pull changes for ${tableName}:`, error);
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return 0;
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}
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}
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/**
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* Resolve conflicts between local and server data
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* Strategy: Server wins (can be customized)
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*/
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private resolveConflict(localData: any, serverData: any): any {
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// Simple strategy: server wins
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// TODO: Implement more sophisticated conflict resolution
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console.warn('Conflict detected, using server data');
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return serverData;
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}
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/**
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* Get sync progress
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*/
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getSyncProgress(): SyncProgress {
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// This will be called synchronously, so we return cached state
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// The actual sync status is updated via events
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return {
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isSyncing: this.isSyncing,
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pendingChanges: 0, // Will be updated via IPC
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isOnline: this.isOnline
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};
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}
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}
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export interface SyncResult {
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success: boolean;
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error?: string;
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pushedChanges: number;
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pulledChanges: number;
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}
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export interface SyncProgress {
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isSyncing: boolean;
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pendingChanges: number;
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isOnline: boolean;
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tables?: { table: string; lastSync: number; pending: number }[];
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}
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// Singleton instance
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let syncServiceInstance: SyncService | null = null;
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export function getSyncService(): SyncService {
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if (!syncServiceInstance) {
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syncServiceInstance = new SyncService();
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}
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return syncServiceInstance;
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}
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