/** * Comprehensive Migration Examples for DebrosFramework * * This file demonstrates the migration system capabilities: * - Schema evolution with field additions and modifications * - Data transformation and migration * - Rollback scenarios and recovery * - Cross-model relationship changes * - Performance optimization migrations * - Version management and dependency handling */ import { MigrationManager, Migration } from '../src/framework/migrations/MigrationManager'; import { MigrationBuilder, createMigration } from '../src/framework/migrations/MigrationBuilder'; import { SocialPlatformFramework } from './framework-integration'; export class MigrationExamples { private migrationManager: MigrationManager; private framework: SocialPlatformFramework; constructor(framework: SocialPlatformFramework) { this.framework = framework; this.migrationManager = new MigrationManager( (framework as any).databaseManager, (framework as any).shardManager ); } async runAllExamples(): Promise { console.log('🔄 Running comprehensive migration examples...\n'); await this.createExampleMigrations(); await this.basicMigrationExamples(); await this.complexDataTransformationExamples(); await this.rollbackAndRecoveryExamples(); await this.performanceOptimizationExamples(); await this.crossModelMigrationExamples(); await this.versionManagementExamples(); console.log('✅ All migration examples completed!\n'); } async createExampleMigrations(): Promise { console.log('📝 Creating Example Migrations'); console.log('==============================\n'); // Migration 1: Add timestamps to User model const addTimestampsMigration = createMigration( 'add_user_timestamps', '1.0.1', 'Add timestamps to User model' ) .description('Add createdAt and updatedAt timestamps to User model for better tracking') .author('Framework Team') .tags('schema', 'timestamps', 'user') .addTimestamps('User') .addValidator( 'validate_timestamp_format', 'Ensure timestamp fields are valid numbers', async (context) => { const errors: string[] = []; const warnings: string[] = []; // Validate that all timestamps are valid return { valid: errors.length === 0, errors, warnings }; } ) .build(); // Migration 2: Add user profile enhancements const userProfileEnhancement = createMigration( 'enhance_user_profile', '1.1.0', 'Enhance User profile with additional fields' ) .description('Add profile picture, location, and social links to User model') .dependencies('add_user_timestamps') .addField('User', 'profilePicture', { type: 'string', required: false, validate: (value) => !value || value.startsWith('http') }) .addField('User', 'location', { type: 'string', required: false }) .addField('User', 'socialLinks', { type: 'array', required: false, default: [] }) .addField('User', 'isVerified', { type: 'boolean', required: false, default: false }) .build(); // Migration 3: Restructure Post content const postContentRestructure = createMigration( 'restructure_post_content', '1.2.0', 'Restructure Post content with rich metadata' ) .description('Transform Post content from plain text to rich content structure') .addField('Post', 'contentType', { type: 'string', required: false, default: 'text' }) .addField('Post', 'metadata', { type: 'object', required: false, default: {} }) .transformData('Post', (post) => { // Transform existing content to new structure const wordCount = post.content ? post.content.split(' ').length : 0; const hasLinks = post.content ? /https?:\/\//.test(post.content) : false; return { ...post, contentType: hasLinks ? 'rich' : 'text', metadata: { wordCount, hasLinks, transformedAt: Date.now() } }; }) .build(); // Migration 4: Add Comment threading const commentThreading = createMigration( 'add_comment_threading', '1.3.0', 'Add threading support to Comments' ) .description('Add parent-child relationships to comments for threading') .addField('Comment', 'parentId', { type: 'string', required: false, default: null }) .addField('Comment', 'threadDepth', { type: 'number', required: false, default: 0 }) .addField('Comment', 'childCount', { type: 'number', required: false, default: 0 }) .transformData('Comment', (comment) => { // All existing comments become root-level comments return { ...comment, parentId: null, threadDepth: 0, childCount: 0 }; }) .build(); // Migration 5: Performance optimization const performanceOptimization = createMigration( 'optimize_post_indexing', '1.4.0', 'Optimize Post model for better query performance' ) .description('Add computed fields and indexes for better query performance') .addField('Post', 'searchText', { type: 'string', required: false, default: '' }) .addField('Post', 'popularityScore', { type: 'number', required: false, default: 0 }) .transformData('Post', (post) => { // Create searchable text and calculate popularity const searchText = `${post.title || ''} ${post.content || ''}`.toLowerCase(); const popularityScore = (post.likeCount || 0) * 2 + (post.commentCount || 0); return { ...post, searchText, popularityScore }; }) .createIndex('Post', ['searchText']) .createIndex('Post', ['popularityScore'], { name: 'popularity_index' }) .build(); // Register all migrations const migrations = [ addTimestampsMigration, userProfileEnhancement, postContentRestructure, commentThreading, performanceOptimization ]; for (const migration of migrations) { this.migrationManager.registerMigration(migration); console.log(`✅ Registered migration: ${migration.name} (v${migration.version})`); } console.log(`\nRegistered ${migrations.length} example migrations\n`); } async basicMigrationExamples(): Promise { console.log('🔄 Basic Migration Examples'); console.log('===========================\n'); // Get pending migrations const pendingMigrations = this.migrationManager.getPendingMigrations(); console.log(`Found ${pendingMigrations.length} pending migrations:`); pendingMigrations.forEach(migration => { console.log(`- ${migration.name} (v${migration.version})`); }); // Run a single migration with dry run first if (pendingMigrations.length > 0) { const firstMigration = pendingMigrations[0]; console.log(`\nRunning dry run for: ${firstMigration.name}`); const dryRunResult = await this.migrationManager.runMigration(firstMigration.id, { dryRun: true }); console.log('Dry run results:'); console.log(`- Success: ${dryRunResult.success}`); console.log(`- Estimated records: ${dryRunResult.recordsProcessed}`); console.log(`- Duration: ${dryRunResult.duration}ms`); console.log(`- Warnings: ${dryRunResult.warnings.length}`); // Run the actual migration console.log(`\nRunning actual migration: ${firstMigration.name}`); try { const result = await this.migrationManager.runMigration(firstMigration.id, { batchSize: 50 }); console.log('Migration results:'); console.log(`- Success: ${result.success}`); console.log(`- Records processed: ${result.recordsProcessed}`); console.log(`- Records modified: ${result.recordsModified}`); console.log(`- Duration: ${result.duration}ms`); console.log(`- Rollback available: ${result.rollbackAvailable}`); if (result.warnings.length > 0) { console.log('- Warnings:', result.warnings); } } catch (error) { console.error(`Migration failed: ${error}`); } } console.log(''); } async complexDataTransformationExamples(): Promise { console.log('🔄 Complex Data Transformation Examples'); console.log('=======================================\n'); // Create a complex migration that transforms user data const userDataNormalization = createMigration( 'normalize_user_data', '2.0.0', 'Normalize and clean user data' ) .description('Clean up user data, normalize email formats, and merge duplicate accounts') .transformData('User', (user) => { // Normalize email to lowercase if (user.email) { user.email = user.email.toLowerCase().trim(); } // Clean up username if (user.username) { user.username = user.username.trim().replace(/[^a-zA-Z0-9_]/g, ''); } // Add normalized search fields user.searchName = (user.username || '').toLowerCase(); user.displayName = user.username || user.email?.split('@')[0] || 'Anonymous'; return user; }) .addValidator( 'validate_email_uniqueness', 'Ensure email addresses are unique after normalization', async (context) => { // Simulation of validation logic return { valid: true, errors: [], warnings: ['Some duplicate emails may have been found'] }; } ) .build(); this.migrationManager.registerMigration(userDataNormalization); // Create a migration that handles relationship data const postRelationshipMigration = createMigration( 'update_post_relationships', '2.1.0', 'Update Post relationship structure' ) .description('Restructure how posts relate to users and add engagement metrics') .addField('Post', 'engagementScore', { type: 'number', required: false, default: 0 }) .addField('Post', 'lastActivityAt', { type: 'number', required: false, default: Date.now() }) .customOperation('Post', async (context) => { context.logger.info('Calculating engagement scores for all posts'); // Simulate complex calculation across related models const posts = await context.databaseManager.getAllRecords('Post'); for (const post of posts) { // Get related comments and likes const comments = await context.databaseManager.getRelatedRecords('Comment', 'postId', post.id); const likes = post.likeCount || 0; // Calculate engagement score const engagementScore = (comments.length * 2) + likes; const lastActivityAt = comments.length > 0 ? Math.max(...comments.map((c: any) => c.createdAt || 0)) : post.createdAt || Date.now(); post.engagementScore = engagementScore; post.lastActivityAt = lastActivityAt; await context.databaseManager.updateRecord('Post', post); } }) .build(); this.migrationManager.registerMigration(postRelationshipMigration); console.log('Created complex data transformation migrations'); console.log('- User data normalization'); console.log('- Post relationship updates with engagement scoring'); console.log(''); } async rollbackAndRecoveryExamples(): Promise { console.log('â†Šī¸ Rollback and Recovery Examples'); console.log('==================================\n'); // Create a migration that might fail const riskyMigration = createMigration( 'risky_data_migration', '2.2.0', 'Risky data migration (demonstration)' ) .description('A migration that demonstrates rollback capabilities') .addField('User', 'tempField', { type: 'string', required: false, default: 'temp' }) .customOperation('User', async (context) => { context.logger.info('Performing risky operation that might fail'); // Simulate a 50% chance of failure for demonstration if (Math.random() > 0.5) { throw new Error('Simulated operation failure for rollback demonstration'); } context.logger.info('Risky operation completed successfully'); }) .build(); this.migrationManager.registerMigration(riskyMigration); try { console.log('Running risky migration (may fail)...'); const result = await this.migrationManager.runMigration(riskyMigration.id); console.log(`Migration result: ${result.success ? 'SUCCESS' : 'FAILED'}`); if (result.success) { console.log('Migration succeeded, demonstrating rollback...'); // Demonstrate manual rollback const rollbackResult = await this.migrationManager.rollbackMigration(riskyMigration.id); console.log(`Rollback result: ${rollbackResult.success ? 'SUCCESS' : 'FAILED'}`); console.log(`Rollback duration: ${rollbackResult.duration}ms`); } } catch (error) { console.log(`Migration failed as expected: ${error}`); // Check migration history const history = this.migrationManager.getMigrationHistory(riskyMigration.id); console.log(`Migration attempts: ${history.length}`); if (history.length > 0) { const lastAttempt = history[history.length - 1]; console.log(`Last attempt result: ${lastAttempt.success ? 'SUCCESS' : 'FAILED'}`); console.log(`Rollback available: ${lastAttempt.rollbackAvailable}`); } } // Demonstrate recovery scenarios console.log('\nDemonstrating recovery scenarios...'); const recoveryMigration = createMigration( 'recovery_migration', '2.3.0', 'Recovery migration with validation' ) .description('Migration with comprehensive pre and post validation') .addValidator( 'pre_migration_check', 'Validate system state before migration', async (context) => { context.logger.info('Running pre-migration validation'); return { valid: true, errors: [], warnings: ['System is ready for migration'] }; } ) .addField('Post', 'recoveryField', { type: 'string', required: false, default: 'recovered' }) .addValidator( 'post_migration_check', 'Validate migration results', async (context) => { context.logger.info('Running post-migration validation'); return { valid: true, errors: [], warnings: ['Migration completed successfully'] }; } ) .build(); this.migrationManager.registerMigration(recoveryMigration); console.log('Created recovery migration with validation'); console.log(''); } async performanceOptimizationExamples(): Promise { console.log('🚀 Performance Optimization Migration Examples'); console.log('===============================================\n'); // Create migrations that optimize different aspects const indexOptimization = createMigration( 'optimize_search_indexes', '3.0.0', 'Optimize search and query performance' ) .description('Add indexes and computed fields for better query performance') .createIndex('User', ['email'], { unique: true, name: 'user_email_unique' }) .createIndex('User', ['username'], { unique: true, name: 'user_username_unique' }) .createIndex('Post', ['userId', 'createdAt'], { name: 'user_posts_timeline' }) .createIndex('Post', ['isPublic', 'popularityScore'], { name: 'public_popular_posts' }) .createIndex('Comment', ['postId', 'createdAt'], { name: 'post_comments_timeline' }) .build(); const dataArchiving = createMigration( 'archive_old_data', '3.1.0', 'Archive old inactive data' ) .description('Move old inactive data to archive tables for better performance') .addField('Post', 'isArchived', { type: 'boolean', required: false, default: false }) .addField('Comment', 'isArchived', { type: 'boolean', required: false, default: false }) .customOperation('Post', async (context) => { context.logger.info('Archiving old posts'); const cutoffDate = Date.now() - (365 * 24 * 60 * 60 * 1000); // 1 year ago const posts = await context.databaseManager.getAllRecords('Post'); let archivedCount = 0; for (const post of posts) { if ((post.lastActivityAt || post.createdAt || 0) < cutoffDate && (post.engagementScore || 0) < 5) { post.isArchived = true; await context.databaseManager.updateRecord('Post', post); archivedCount++; } } context.logger.info(`Archived ${archivedCount} old posts`); }) .build(); const cacheOptimization = createMigration( 'optimize_cache_fields', '3.2.0', 'Add cache-friendly computed fields' ) .description('Add denormalized fields to reduce query complexity') .addField('User', 'postCount', { type: 'number', required: false, default: 0 }) .addField('User', 'totalEngagement', { type: 'number', required: false, default: 0 }) .addField('Post', 'commentCount', { type: 'number', required: false, default: 0 }) .customOperation('User', async (context) => { context.logger.info('Computing user statistics'); const users = await context.databaseManager.getAllRecords('User'); for (const user of users) { const posts = await context.databaseManager.getRelatedRecords('Post', 'userId', user.id); const totalEngagement = posts.reduce((sum: number, post: any) => sum + (post.engagementScore || 0), 0); user.postCount = posts.length; user.totalEngagement = totalEngagement; await context.databaseManager.updateRecord('User', user); } }) .build(); // Register performance migrations [indexOptimization, dataArchiving, cacheOptimization].forEach(migration => { this.migrationManager.registerMigration(migration); console.log(`✅ Registered: ${migration.name}`); }); console.log('\nPerformance optimization migrations created:'); console.log('- Search index optimization'); console.log('- Data archiving for old content'); console.log('- Cache-friendly denormalized fields'); console.log(''); } async crossModelMigrationExamples(): Promise { console.log('🔗 Cross-Model Migration Examples'); console.log('=================================\n'); // Migration that affects multiple models and their relationships const relationshipRestructure = createMigration( 'restructure_follow_system', '4.0.0', 'Restructure follow system with categories' ) .description('Add follow categories and mutual follow detection') .addField('Follow', 'category', { type: 'string', required: false, default: 'general' }) .addField('Follow', 'isMutual', { type: 'boolean', required: false, default: false }) .addField('Follow', 'strength', { type: 'number', required: false, default: 1 }) .customOperation('Follow', async (context) => { context.logger.info('Analyzing follow relationships'); const follows = await context.databaseManager.getAllRecords('Follow'); const mutualMap = new Map>(); // Build mutual follow map follows.forEach((follow: any) => { if (!mutualMap.has(follow.followerId)) { mutualMap.set(follow.followerId, new Set()); } mutualMap.get(follow.followerId)!.add(follow.followingId); }); // Update mutual status for (const follow of follows) { const reverseExists = mutualMap.get(follow.followingId)?.has(follow.followerId); follow.isMutual = Boolean(reverseExists); // Calculate relationship strength based on mutual status and activity follow.strength = follow.isMutual ? 2 : 1; await context.databaseManager.updateRecord('Follow', follow); } }) .build(); const contentCategorization = createMigration( 'add_content_categories', '4.1.0', 'Add content categorization system' ) .description('Add categories and tags to posts and improve content discovery') .addField('Post', 'category', { type: 'string', required: false, default: 'general' }) .addField('Post', 'subcategory', { type: 'string', required: false }) .addField('Post', 'autoTags', { type: 'array', required: false, default: [] }) .transformData('Post', (post) => { // Auto-categorize posts based on content const content = (post.content || '').toLowerCase(); let category = 'general'; let autoTags: string[] = []; if (content.includes('tech') || content.includes('programming')) { category = 'technology'; autoTags.push('tech'); } else if (content.includes('art') || content.includes('design')) { category = 'creative'; autoTags.push('art'); } else if (content.includes('news') || content.includes('update')) { category = 'news'; autoTags.push('news'); } // Extract hashtags as auto tags const hashtags = content.match(/#\w+/g) || []; autoTags.push(...hashtags.map(tag => tag.slice(1))); return { ...post, category, autoTags: [...new Set(autoTags)] // Remove duplicates }; }) .build(); // Register cross-model migrations [relationshipRestructure, contentCategorization].forEach(migration => { this.migrationManager.registerMigration(migration); console.log(`✅ Registered: ${migration.name}`); }); console.log('\nCross-model migrations demonstrate:'); console.log('- Complex relationship analysis and updates'); console.log('- Multi-model data transformation'); console.log('- Automatic content categorization'); console.log(''); } async versionManagementExamples(): Promise { console.log('📋 Version Management Examples'); console.log('==============================\n'); // Demonstrate migration ordering and dependencies const allMigrations = this.migrationManager.getMigrations(); console.log('Migration dependency chain:'); allMigrations.forEach(migration => { const deps = migration.dependencies?.join(', ') || 'None'; console.log(`- ${migration.name} (v${migration.version}) depends on: ${deps}`); }); // Show pending migrations in order const pendingMigrations = this.migrationManager.getPendingMigrations(); console.log(`\nPending migrations (${pendingMigrations.length}):`); pendingMigrations.forEach((migration, index) => { console.log(`${index + 1}. ${migration.name} (v${migration.version})`); }); // Demonstrate batch migration with different strategies console.log('\nRunning pending migrations with different strategies:'); if (pendingMigrations.length > 0) { console.log('\n1. Dry run all pending migrations:'); try { const dryRunResults = await this.migrationManager.runPendingMigrations({ dryRun: true, stopOnError: false }); console.log(`Dry run completed: ${dryRunResults.length} migrations processed`); dryRunResults.forEach(result => { console.log(`- ${result.migrationId}: ${result.success ? 'SUCCESS' : 'FAILED'}`); }); } catch (error) { console.error(`Dry run failed: ${error}`); } console.log('\n2. Run migrations with stop-on-error:'); try { const results = await this.migrationManager.runPendingMigrations({ stopOnError: true, batchSize: 25 }); console.log(`Migration batch completed: ${results.length} migrations`); } catch (error) { console.error(`Migration batch stopped due to error: ${error}`); } } // Show migration history and statistics const history = this.migrationManager.getMigrationHistory(); console.log(`\nMigration history (${history.length} total runs):`); history.slice(0, 5).forEach(result => { console.log(`- ${result.migrationId}: ${result.success ? 'SUCCESS' : 'FAILED'} ` + `(${result.duration}ms, ${result.recordsProcessed} records)`); }); // Show active migrations (should be empty in examples) const activeMigrations = this.migrationManager.getActiveMigrations(); console.log(`\nActive migrations: ${activeMigrations.length}`); console.log(''); } async demonstrateAdvancedFeatures(): Promise { console.log('đŸ”Ŧ Advanced Migration Features'); console.log('==============================\n'); // Create a migration with complex validation const complexValidation = createMigration( 'complex_validation_example', '5.0.0', 'Migration with complex validation' ) .description('Demonstrates advanced validation and error handling') .addValidator( 'check_data_consistency', 'Verify data consistency across models', async (context) => { const errors: string[] = []; const warnings: string[] = []; // Simulate complex validation const users = await context.databaseManager.getAllRecords('User'); const posts = await context.databaseManager.getAllRecords('Post'); // Check for orphaned posts const userIds = new Set(users.map((u: any) => u.id)); const orphanedPosts = posts.filter((p: any) => !userIds.has(p.userId)); if (orphanedPosts.length > 0) { warnings.push(`Found ${orphanedPosts.length} orphaned posts`); } return { valid: errors.length === 0, errors, warnings }; } ) .addField('User', 'validationField', { type: 'string', required: false, default: 'validated' }) .build(); // Create a migration that handles large datasets const largeMigration = createMigration( 'large_dataset_migration', '5.1.0', 'Migration optimized for large datasets' ) .description('Demonstrates batch processing and progress tracking') .customOperation('Post', async (context) => { context.logger.info('Processing large dataset with progress tracking'); const totalRecords = 10000; // Simulate large dataset const batchSize = 100; for (let i = 0; i < totalRecords; i += batchSize) { const progress = ((i / totalRecords) * 100).toFixed(1); context.logger.info(`Processing batch ${i / batchSize + 1}, Progress: ${progress}%`); // Simulate processing time await new Promise(resolve => setTimeout(resolve, 10)); context.progress.processedRecords = i + batchSize; context.progress.estimatedTimeRemaining = ((totalRecords - i) / batchSize) * 10; // Rough estimate } }) .build(); console.log('Created advanced feature demonstrations:'); console.log('- Complex multi-model validation'); console.log('- Large dataset processing with progress tracking'); console.log('- Error handling and recovery strategies'); console.log(''); } } // Usage function export async function runMigrationExamples( orbitDBService: any, ipfsService: any ): Promise { const framework = new SocialPlatformFramework(); try { await framework.initialize(orbitDBService, ipfsService, 'development'); // Create sample data first await createSampleDataForMigrations(framework); // Run migration examples const examples = new MigrationExamples(framework); await examples.runAllExamples(); await examples.demonstrateAdvancedFeatures(); // Show final migration statistics const migrationManager = (examples as any).migrationManager; const allMigrations = migrationManager.getMigrations(); const history = migrationManager.getMigrationHistory(); console.log('📊 Final Migration Statistics:'); console.log('============================='); console.log(`Total migrations registered: ${allMigrations.length}`); console.log(`Total migration runs: ${history.length}`); console.log(`Successful runs: ${history.filter((h: any) => h.success).length}`); console.log(`Failed runs: ${history.filter((h: any) => !h.success).length}`); const totalDuration = history.reduce((sum: number, h: any) => sum + h.duration, 0); console.log(`Total migration time: ${totalDuration}ms`); const totalRecords = history.reduce((sum: number, h: any) => sum + h.recordsProcessed, 0); console.log(`Total records processed: ${totalRecords}`); } catch (error) { console.error('❌ Migration examples failed:', error); } finally { await framework.stop(); } } async function createSampleDataForMigrations(framework: SocialPlatformFramework): Promise { console.log('đŸ—„ī¸ Creating sample data for migration testing...\n'); try { // Create users without timestamps (to demonstrate migration) const users = []; for (let i = 0; i < 5; i++) { const user = await framework.createUser({ username: `migrationuser${i}`, email: `migration${i}@example.com`, bio: `Migration test user ${i}` }); users.push(user); } // Create posts with basic structure const posts = []; for (let i = 0; i < 10; i++) { const user = users[i % users.length]; const post = await framework.createPost(user.id, { title: `Migration Test Post ${i}`, content: `This is test content for migration testing. Post ${i} with various content types.`, tags: ['migration', 'test'], isPublic: true }); posts.push(post); } // Create comments for (let i = 0; i < 15; i++) { const user = users[i % users.length]; const post = posts[i % posts.length]; await framework.createComment( user.id, post.id, `Migration test comment ${i}` ); } // Create follow relationships for (let i = 0; i < users.length; i++) { for (let j = 0; j < users.length; j++) { if (i !== j && Math.random() > 0.6) { await framework.followUser(users[i].id, users[j].id); } } } console.log(`✅ Created sample data: ${users.length} users, ${posts.length} posts, 15 comments\n`); } catch (error) { console.warn('âš ī¸ Some sample data creation failed:', error); } }