Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 | /**
* MigrationManager - Schema Migration and Data Transformation System
*
* This class handles:
* - Schema version management across distributed databases
* - Automatic data migration and transformation
* - Rollback capabilities for failed migrations
* - Conflict resolution during migration
* - Migration validation and integrity checks
* - Cross-shard migration coordination
*/
import { FieldConfig } from '../types/models';
export interface Migration {
id: string;
version: string;
name: string;
description: string;
targetModels: string[];
up: MigrationOperation[];
down: MigrationOperation[];
dependencies?: string[]; // Migration IDs that must run before this one
validators?: MigrationValidator[];
createdAt: number;
author?: string;
tags?: string[];
}
export interface MigrationOperation {
type:
| 'add_field'
| 'remove_field'
| 'modify_field'
| 'rename_field'
| 'add_index'
| 'remove_index'
| 'transform_data'
| 'custom';
modelName: string;
fieldName?: string;
newFieldName?: string;
fieldConfig?: FieldConfig;
indexConfig?: any;
transformer?: (data: any) => any;
customOperation?: (context: MigrationContext) => Promise<void>;
rollbackOperation?: (context: MigrationContext) => Promise<void>;
options?: {
batchSize?: number;
parallel?: boolean;
skipValidation?: boolean;
};
}
export interface MigrationValidator {
name: string;
description: string;
validate: (context: MigrationContext) => Promise<ValidationResult>;
}
export interface MigrationContext {
migration: Migration;
modelName: string;
databaseManager: any;
shardManager: any;
currentData?: any[];
operation: MigrationOperation;
progress: MigrationProgress;
logger: MigrationLogger;
}
export interface MigrationProgress {
migrationId: string;
status: 'pending' | 'running' | 'completed' | 'failed' | 'rolled_back';
startedAt?: number;
completedAt?: number;
totalRecords: number;
processedRecords: number;
errorCount: number;
warnings: string[];
errors: string[];
currentOperation?: string;
estimatedTimeRemaining?: number;
}
export interface MigrationResult {
migrationId: string;
success: boolean;
duration: number;
recordsProcessed: number;
recordsModified: number;
warnings: string[];
errors: string[];
rollbackAvailable: boolean;
}
export interface MigrationLogger {
info: (message: string, meta?: any) => void;
warn: (message: string, meta?: any) => void;
error: (message: string, meta?: any) => void;
debug: (message: string, meta?: any) => void;
}
export interface ValidationResult {
valid: boolean;
errors: string[];
warnings: string[];
}
export class MigrationManager {
private databaseManager: any;
private shardManager: any;
private migrations: Map<string, Migration> = new Map();
private migrationHistory: Map<string, MigrationResult[]> = new Map();
private activeMigrations: Map<string, MigrationProgress> = new Map();
private migrationOrder: string[] = [];
private logger: MigrationLogger;
constructor(databaseManager: any, shardManager: any, logger?: MigrationLogger) {
this.databaseManager = databaseManager;
this.shardManager = shardManager;
this.logger = logger || this.createDefaultLogger();
}
// Register a new migration
registerMigration(migration: Migration): void {
// Validate migration structure
this.validateMigrationStructure(migration);
// Check for version conflicts
const existingMigration = Array.from(this.migrations.values()).find(
(m) => m.version === migration.version,
);
if (existingMigration && existingMigration.id !== migration.id) {
throw new Error(`Migration version ${migration.version} already exists with different ID`);
}
this.migrations.set(migration.id, migration);
this.updateMigrationOrder();
this.logger.info(`Registered migration: ${migration.name} (${migration.version})`, {
migrationId: migration.id,
targetModels: migration.targetModels,
});
}
// Get all registered migrations
getMigrations(): Migration[] {
return Array.from(this.migrations.values()).sort((a, b) =>
this.compareVersions(a.version, b.version),
);
}
// Get migration by ID
getMigration(migrationId: string): Migration | null {
return this.migrations.get(migrationId) || null;
}
// Get pending migrations for a model or all models
getPendingMigrations(modelName?: string): Migration[] {
const allMigrations = this.getMigrations();
const appliedMigrations = this.getAppliedMigrations(modelName);
const appliedIds = new Set(appliedMigrations.map((m) => m.migrationId));
return allMigrations.filter((migration) => {
if (!appliedIds.has(migration.id)) {
return modelName ? migration.targetModels.includes(modelName) : true;
}
return false;
});
}
// Run a specific migration
async runMigration(
migrationId: string,
options: {
dryRun?: boolean;
batchSize?: number;
parallelShards?: boolean;
skipValidation?: boolean;
} = {},
): Promise<MigrationResult> {
const migration = this.migrations.get(migrationId);
if (!migration) {
throw new Error(`Migration ${migrationId} not found`);
}
// Check if migration is already running
if (this.activeMigrations.has(migrationId)) {
throw new Error(`Migration ${migrationId} is already running`);
}
// Check dependencies
await this.validateDependencies(migration);
const startTime = Date.now();
const progress: MigrationProgress = {
migrationId,
status: 'running',
startedAt: startTime,
totalRecords: 0,
processedRecords: 0,
errorCount: 0,
warnings: [],
errors: [],
};
this.activeMigrations.set(migrationId, progress);
try {
this.logger.info(`Starting migration: ${migration.name}`, {
migrationId,
dryRun: options.dryRun,
options,
});
if (options.dryRun) {
return await this.performDryRun(migration, options);
}
// Pre-migration validation
if (!options.skipValidation) {
await this.runPreMigrationValidation(migration);
}
// Execute migration operations
const result = await this.executeMigration(migration, options, progress);
// Post-migration validation
if (!options.skipValidation) {
await this.runPostMigrationValidation(migration);
}
// Record successful migration
progress.status = 'completed';
progress.completedAt = Date.now();
await this.recordMigrationResult(result);
this.logger.info(`Migration completed: ${migration.name}`, {
migrationId,
duration: result.duration,
recordsProcessed: result.recordsProcessed,
});
return result;
} catch (error: any) {
progress.status = 'failed';
progress.errors.push(error.message);
this.logger.error(`Migration failed: ${migration.name}`, {
migrationId,
error: error.message,
stack: error.stack,
});
// Attempt rollback if possible
const rollbackResult = await this.attemptRollback(migration, progress);
const result: MigrationResult = {
migrationId,
success: false,
duration: Date.now() - startTime,
recordsProcessed: progress.processedRecords,
recordsModified: 0,
warnings: progress.warnings,
errors: progress.errors,
rollbackAvailable: rollbackResult.success,
};
await this.recordMigrationResult(result);
throw error;
} finally {
this.activeMigrations.delete(migrationId);
}
}
// Run all pending migrations
async runPendingMigrations(
options: {
modelName?: string;
dryRun?: boolean;
stopOnError?: boolean;
batchSize?: number;
} = {},
): Promise<MigrationResult[]> {
const pendingMigrations = this.getPendingMigrations(options.modelName);
const results: MigrationResult[] = [];
this.logger.info(`Running ${pendingMigrations.length} pending migrations`, {
modelName: options.modelName,
dryRun: options.dryRun,
});
for (const migration of pendingMigrations) {
try {
const result = await this.runMigration(migration.id, {
dryRun: options.dryRun,
batchSize: options.batchSize,
});
results.push(result);
if (!result.success && options.stopOnError) {
this.logger.warn('Stopping migration run due to error', {
failedMigration: migration.id,
stopOnError: options.stopOnError,
});
break;
}
} catch (error) {
if (options.stopOnError) {
throw error;
}
this.logger.error(`Skipping failed migration: ${migration.id}`, { error });
}
}
return results;
}
// Rollback a migration
async rollbackMigration(migrationId: string): Promise<MigrationResult> {
const migration = this.migrations.get(migrationId);
if (!migration) {
throw new Error(`Migration ${migrationId} not found`);
}
const appliedMigrations = this.getAppliedMigrations();
const isApplied = appliedMigrations.some((m) => m.migrationId === migrationId && m.success);
if (!isApplied) {
throw new Error(`Migration ${migrationId} has not been applied`);
}
const startTime = Date.now();
const progress: MigrationProgress = {
migrationId,
status: 'running',
startedAt: startTime,
totalRecords: 0,
processedRecords: 0,
errorCount: 0,
warnings: [],
errors: [],
};
try {
this.logger.info(`Starting rollback: ${migration.name}`, { migrationId });
const result = await this.executeRollback(migration, progress);
result.rollbackAvailable = false;
await this.recordMigrationResult(result);
this.logger.info(`Rollback completed: ${migration.name}`, {
migrationId,
duration: result.duration,
});
return result;
} catch (error: any) {
this.logger.error(`Rollback failed: ${migration.name}`, {
migrationId,
error: error.message,
});
throw error;
}
}
// Execute migration operations
private async executeMigration(
migration: Migration,
options: any,
progress: MigrationProgress,
): Promise<MigrationResult> {
const startTime = Date.now();
let totalProcessed = 0;
let totalModified = 0;
for (const modelName of migration.targetModels) {
for (const operation of migration.up) {
if (operation.modelName !== modelName) continue;
progress.currentOperation = `${operation.type} on ${operation.modelName}.${operation.fieldName || 'N/A'}`;
this.logger.debug(`Executing operation: ${progress.currentOperation}`, {
migrationId: migration.id,
operation: operation.type,
});
const context: MigrationContext = {
migration,
modelName,
databaseManager: this.databaseManager,
shardManager: this.shardManager,
operation,
progress,
logger: this.logger,
};
const operationResult = await this.executeOperation(context, options);
totalProcessed += operationResult.processed;
totalModified += operationResult.modified;
progress.processedRecords = totalProcessed;
}
}
return {
migrationId: migration.id,
success: true,
duration: Date.now() - startTime,
recordsProcessed: totalProcessed,
recordsModified: totalModified,
warnings: progress.warnings,
errors: progress.errors,
rollbackAvailable: migration.down.length > 0,
};
}
// Execute a single migration operation
private async executeOperation(
context: MigrationContext,
options: any,
): Promise<{ processed: number; modified: number }> {
const { operation } = context;
switch (operation.type) {
case 'add_field':
return await this.executeAddField(context, options);
case 'remove_field':
return await this.executeRemoveField(context, options);
case 'modify_field':
return await this.executeModifyField(context, options);
case 'rename_field':
return await this.executeRenameField(context, options);
case 'transform_data':
return await this.executeDataTransformation(context, options);
case 'custom':
return await this.executeCustomOperation(context, options);
default:
throw new Error(`Unsupported operation type: ${operation.type}`);
}
}
// Execute add field operation
private async executeAddField(
context: MigrationContext,
options: any,
): Promise<{ processed: number; modified: number }> {
const { operation } = context;
if (!operation.fieldName || !operation.fieldConfig) {
throw new Error('Add field operation requires fieldName and fieldConfig');
}
// Update model metadata (in a real implementation, this would update the model registry)
this.logger.info(`Adding field ${operation.fieldName} to ${operation.modelName}`, {
fieldConfig: operation.fieldConfig,
});
// Get all records for this model
const records = await this.getAllRecordsForModel(operation.modelName);
let modified = 0;
// Add default value to existing records
const batchSize = options.batchSize || 100;
for (let i = 0; i < records.length; i += batchSize) {
const batch = records.slice(i, i + batchSize);
for (const record of batch) {
if (!(operation.fieldName in record)) {
record[operation.fieldName] = operation.fieldConfig.default || null;
await this.updateRecord(operation.modelName, record);
modified++;
}
}
context.progress.processedRecords += batch.length;
}
return { processed: records.length, modified };
}
// Execute remove field operation
private async executeRemoveField(
context: MigrationContext,
options: any,
): Promise<{ processed: number; modified: number }> {
const { operation } = context;
if (!operation.fieldName) {
throw new Error('Remove field operation requires fieldName');
}
this.logger.info(`Removing field ${operation.fieldName} from ${operation.modelName}`);
const records = await this.getAllRecordsForModel(operation.modelName);
let modified = 0;
const batchSize = options.batchSize || 100;
for (let i = 0; i < records.length; i += batchSize) {
const batch = records.slice(i, i + batchSize);
for (const record of batch) {
if (operation.fieldName in record) {
delete record[operation.fieldName];
await this.updateRecord(operation.modelName, record);
modified++;
}
}
context.progress.processedRecords += batch.length;
}
return { processed: records.length, modified };
}
// Execute modify field operation
private async executeModifyField(
context: MigrationContext,
options: any,
): Promise<{ processed: number; modified: number }> {
const { operation } = context;
if (!operation.fieldName || !operation.fieldConfig) {
throw new Error('Modify field operation requires fieldName and fieldConfig');
}
this.logger.info(`Modifying field ${operation.fieldName} in ${operation.modelName}`, {
newConfig: operation.fieldConfig,
});
const records = await this.getAllRecordsForModel(operation.modelName);
let modified = 0;
const batchSize = options.batchSize || 100;
for (let i = 0; i < records.length; i += batchSize) {
const batch = records.slice(i, i + batchSize);
for (const record of batch) {
if (operation.fieldName in record) {
// Apply type conversion if needed
const oldValue = record[operation.fieldName];
const newValue = this.convertFieldValue(oldValue, operation.fieldConfig);
if (newValue !== oldValue) {
record[operation.fieldName] = newValue;
await this.updateRecord(operation.modelName, record);
modified++;
}
}
}
context.progress.processedRecords += batch.length;
}
return { processed: records.length, modified };
}
// Execute rename field operation
private async executeRenameField(
context: MigrationContext,
options: any,
): Promise<{ processed: number; modified: number }> {
const { operation } = context;
if (!operation.fieldName || !operation.newFieldName) {
throw new Error('Rename field operation requires fieldName and newFieldName');
}
this.logger.info(
`Renaming field ${operation.fieldName} to ${operation.newFieldName} in ${operation.modelName}`,
);
const records = await this.getAllRecordsForModel(operation.modelName);
let modified = 0;
const batchSize = options.batchSize || 100;
for (let i = 0; i < records.length; i += batchSize) {
const batch = records.slice(i, i + batchSize);
for (const record of batch) {
if (operation.fieldName in record) {
record[operation.newFieldName] = record[operation.fieldName];
delete record[operation.fieldName];
await this.updateRecord(operation.modelName, record);
modified++;
}
}
context.progress.processedRecords += batch.length;
}
return { processed: records.length, modified };
}
// Execute data transformation operation
private async executeDataTransformation(
context: MigrationContext,
options: any,
): Promise<{ processed: number; modified: number }> {
const { operation } = context;
if (!operation.transformer) {
throw new Error('Transform data operation requires transformer function');
}
this.logger.info(`Transforming data for ${operation.modelName}`);
const records = await this.getAllRecordsForModel(operation.modelName);
let modified = 0;
const batchSize = options.batchSize || 100;
for (let i = 0; i < records.length; i += batchSize) {
const batch = records.slice(i, i + batchSize);
for (const record of batch) {
try {
const originalRecord = JSON.stringify(record);
const transformedRecord = await operation.transformer(record);
if (JSON.stringify(transformedRecord) !== originalRecord) {
Object.assign(record, transformedRecord);
await this.updateRecord(operation.modelName, record);
modified++;
}
} catch (error: any) {
context.progress.errors.push(`Transform error for record ${record.id}: ${error.message}`);
context.progress.errorCount++;
}
}
context.progress.processedRecords += batch.length;
}
return { processed: records.length, modified };
}
// Execute custom operation
private async executeCustomOperation(
context: MigrationContext,
_options: any,
): Promise<{ processed: number; modified: number }> {
const { operation } = context;
if (!operation.customOperation) {
throw new Error('Custom operation requires customOperation function');
}
this.logger.info(`Executing custom operation for ${operation.modelName}`);
try {
await operation.customOperation(context);
return { processed: 1, modified: 1 }; // Custom operations handle their own counting
} catch (error: any) {
context.progress.errors.push(`Custom operation error: ${error.message}`);
throw error;
}
}
// Helper methods for data access
private async getAllRecordsForModel(modelName: string): Promise<any[]> {
// In a real implementation, this would query all shards for the model
// For now, return empty array as placeholder
this.logger.debug(`Getting all records for model: ${modelName}`);
return [];
}
private async updateRecord(modelName: string, record: any): Promise<void> {
// In a real implementation, this would update the record in the appropriate database
this.logger.debug(`Updating record in ${modelName}:`, { id: record.id });
}
private convertFieldValue(value: any, fieldConfig: FieldConfig): any {
// Convert value based on field configuration
switch (fieldConfig.type) {
case 'string':
return value != null ? String(value) : null;
case 'number':
return value != null ? Number(value) : null;
case 'boolean':
return value != null ? Boolean(value) : null;
case 'array':
return Array.isArray(value) ? value : [value];
default:
return value;
}
}
// Validation methods
private validateMigrationStructure(migration: Migration): void {
if (!migration.id || !migration.version || !migration.name) {
throw new Error('Migration must have id, version, and name');
}
if (!migration.targetModels || migration.targetModels.length === 0) {
throw new Error('Migration must specify target models');
}
if (!migration.up || migration.up.length === 0) {
throw new Error('Migration must have at least one up operation');
}
// Validate operations
for (const operation of migration.up) {
this.validateOperation(operation);
}
if (migration.down) {
for (const operation of migration.down) {
this.validateOperation(operation);
}
}
}
private validateOperation(operation: MigrationOperation): void {
const validTypes = [
'add_field',
'remove_field',
'modify_field',
'rename_field',
'add_index',
'remove_index',
'transform_data',
'custom',
];
if (!validTypes.includes(operation.type)) {
throw new Error(`Invalid operation type: ${operation.type}`);
}
if (!operation.modelName) {
throw new Error('Operation must specify modelName');
}
}
private async validateDependencies(migration: Migration): Promise<void> {
if (!migration.dependencies) return;
const appliedMigrations = this.getAppliedMigrations();
const appliedIds = new Set(appliedMigrations.map((m) => m.migrationId));
for (const dependencyId of migration.dependencies) {
if (!appliedIds.has(dependencyId)) {
throw new Error(`Migration dependency not satisfied: ${dependencyId}`);
}
}
}
private async runPreMigrationValidation(migration: Migration): Promise<void> {
if (!migration.validators) return;
for (const validator of migration.validators) {
this.logger.debug(`Running pre-migration validator: ${validator.name}`);
const context: MigrationContext = {
migration,
modelName: '', // Will be set per model
databaseManager: this.databaseManager,
shardManager: this.shardManager,
operation: migration.up[0], // First operation for context
progress: this.activeMigrations.get(migration.id)!,
logger: this.logger,
};
const result = await validator.validate(context);
if (!result.valid) {
throw new Error(`Pre-migration validation failed: ${result.errors.join(', ')}`);
}
if (result.warnings.length > 0) {
context.progress.warnings.push(...result.warnings);
}
}
}
private async runPostMigrationValidation(_migration: Migration): Promise<void> {
// Similar to pre-migration validation but runs after
this.logger.debug('Running post-migration validation');
}
// Rollback operations
private async executeRollback(
migration: Migration,
progress: MigrationProgress,
): Promise<MigrationResult> {
if (!migration.down || migration.down.length === 0) {
throw new Error('Migration has no rollback operations defined');
}
const startTime = Date.now();
let totalProcessed = 0;
let totalModified = 0;
// Execute rollback operations in reverse order
for (const modelName of migration.targetModels) {
for (const operation of migration.down.reverse()) {
if (operation.modelName !== modelName) continue;
const context: MigrationContext = {
migration,
modelName,
databaseManager: this.databaseManager,
shardManager: this.shardManager,
operation,
progress,
logger: this.logger,
};
const operationResult = await this.executeOperation(context, {});
totalProcessed += operationResult.processed;
totalModified += operationResult.modified;
}
}
return {
migrationId: migration.id,
success: true,
duration: Date.now() - startTime,
recordsProcessed: totalProcessed,
recordsModified: totalModified,
warnings: progress.warnings,
errors: progress.errors,
rollbackAvailable: false,
};
}
private async attemptRollback(
migration: Migration,
progress: MigrationProgress,
): Promise<{ success: boolean }> {
try {
if (migration.down && migration.down.length > 0) {
await this.executeRollback(migration, progress);
progress.status = 'rolled_back';
return { success: true };
}
} catch (error: any) {
this.logger.error(`Rollback failed for migration ${migration.id}`, { error });
}
return { success: false };
}
// Dry run functionality
private async performDryRun(migration: Migration, _options: any): Promise<MigrationResult> {
this.logger.info(`Performing dry run for migration: ${migration.name}`);
const startTime = Date.now();
let estimatedRecords = 0;
// Estimate the number of records that would be affected
for (const modelName of migration.targetModels) {
const modelRecords = await this.countRecordsForModel(modelName);
estimatedRecords += modelRecords;
}
// Simulate operations without actually modifying data
for (const operation of migration.up) {
this.logger.debug(`Dry run operation: ${operation.type} on ${operation.modelName}`);
}
return {
migrationId: migration.id,
success: true,
duration: Date.now() - startTime,
recordsProcessed: estimatedRecords,
recordsModified: estimatedRecords, // Estimate
warnings: ['This was a dry run - no data was actually modified'],
errors: [],
rollbackAvailable: migration.down.length > 0,
};
}
private async countRecordsForModel(_modelName: string): Promise<number> {
// In a real implementation, this would count records across all shards
return 0;
}
// Migration history and state management
private getAppliedMigrations(_modelName?: string): MigrationResult[] {
const allResults: MigrationResult[] = [];
for (const results of this.migrationHistory.values()) {
allResults.push(...results.filter((r) => r.success));
}
return allResults;
}
private async recordMigrationResult(result: MigrationResult): Promise<void> {
if (!this.migrationHistory.has(result.migrationId)) {
this.migrationHistory.set(result.migrationId, []);
}
this.migrationHistory.get(result.migrationId)!.push(result);
// In a real implementation, this would persist to database
this.logger.debug('Recorded migration result', { result });
}
// Version comparison
private compareVersions(version1: string, version2: string): number {
const v1Parts = version1.split('.').map(Number);
const v2Parts = version2.split('.').map(Number);
for (let i = 0; i < Math.max(v1Parts.length, v2Parts.length); i++) {
const v1Part = v1Parts[i] || 0;
const v2Part = v2Parts[i] || 0;
if (v1Part < v2Part) return -1;
if (v1Part > v2Part) return 1;
}
return 0;
}
private updateMigrationOrder(): void {
const migrations = Array.from(this.migrations.values());
this.migrationOrder = migrations
.sort((a, b) => this.compareVersions(a.version, b.version))
.map((m) => m.id);
}
// Utility methods
private createDefaultLogger(): MigrationLogger {
return {
info: (message: string, meta?: any) => console.log(`[MIGRATION INFO] ${message}`, meta || ''),
warn: (message: string, meta?: any) =>
console.warn(`[MIGRATION WARN] ${message}`, meta || ''),
error: (message: string, meta?: any) =>
console.error(`[MIGRATION ERROR] ${message}`, meta || ''),
debug: (message: string, meta?: any) =>
console.log(`[MIGRATION DEBUG] ${message}`, meta || ''),
};
}
// Status and monitoring
getMigrationProgress(migrationId: string): MigrationProgress | null {
return this.activeMigrations.get(migrationId) || null;
}
getActiveMigrations(): MigrationProgress[] {
return Array.from(this.activeMigrations.values());
}
getMigrationHistory(migrationId?: string): MigrationResult[] {
if (migrationId) {
return this.migrationHistory.get(migrationId) || [];
}
const allResults: MigrationResult[] = [];
for (const results of this.migrationHistory.values()) {
allResults.push(...results);
}
return allResults.sort((a, b) => b.duration - a.duration);
}
// Cleanup and maintenance
async cleanup(): Promise<void> {
this.logger.info('Cleaning up migration manager');
this.activeMigrations.clear();
}
}
|