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IProviderAdapter,
MigrationPipeline,
TransformOptions,
LoadOptions,
TransformResult,
VerificationReport,
} from './IProviderAdapter.js';
import {
WorkItem,
WorkItemExport,
WorkItemImport,
WorkItemFilter,
MigrationResult,
Provider,
WorkItemType,
User,
} from '../types/index.js';
import { TypeMapper, MappingInput } from './TypeMapper.js';
/**
* Default migration pipeline implementation
* Handles ETL (Extract, Transform, Load) operations for work item migration
*/
export class DefaultMigrationPipeline implements MigrationPipeline {
/**
* Phase 1: Extract work items from source provider
*/
async extract(source: IProviderAdapter, filter: WorkItemFilter): Promise<WorkItemExport[]> {
console.log(`[Migration] Starting extraction from ${source.constructor.name}`);
try {
// Get work items matching filter
const workItems = await source.listWorkItems(filter);
console.log(`[Migration] Found ${workItems.length} work items to extract`);
// Get detailed exports including relationships
const workItemIds = workItems.map((wi) => wi.id);
const exports = await source.exportWorkItems(workItemIds);
console.log(`[Migration] Successfully exported ${exports.length} work items`);
return exports;
} catch (error) {
console.error(`[Migration] Extraction failed:`, error);
throw new Error(
`Extraction failed: ${error instanceof Error ? error.message : String(error)}`,
);
}
}
/**
* Phase 2: Transform work items for target provider
*/
async transform(
items: WorkItemExport[],
targetProvider: Provider,
options: TransformOptions,
): Promise<TransformResult> {
console.log(`[Migration] Starting transformation for ${targetProvider} provider`);
const result: TransformResult = {
items: [],
warnings: [],
errors: [],
fieldsMapped: new Map(),
fieldsLost: [],
};
for (const item of items) {
try {
const transformed = await this.transformWorkItem(item, targetProvider, options, result);
result.items.push(transformed);
} catch (error) {
const errorMsg = `Failed to transform item ${item.id}: ${error instanceof Error ? error.message : String(error)}`;
result.errors.push(errorMsg);
console.error(`[Migration] ${errorMsg}`);
}
}
console.log(
`[Migration] Transformation complete: ${result.items.length} items, ${result.warnings.length} warnings, ${result.errors.length} errors`,
);
return result;
}
/**
* Phase 3: Load work items into target provider
*/
async load(
target: IProviderAdapter,
items: WorkItemImport[],
options: LoadOptions,
): Promise<MigrationResult> {
console.log(`[Migration] Starting load phase with ${items.length} items`);
const result: MigrationResult = {
successful: 0,
failed: [],
mapping: new Map(),
};
if (options.dryRun) {
console.log(`[Migration] DRY RUN: Would create ${items.length} work items`);
// Simulate successful creation for dry run
items.forEach((item, index) => {
result.mapping.set(item.title, `dry-run-${index + 1}`);
});
result.successful = items.length;
return result;
}
const batches = this.createBatches(items, options.batchSize);
for (let batchIndex = 0; batchIndex < batches.length; batchIndex++) {
const batch = batches[batchIndex];
console.log(
`[Migration] Processing batch ${batchIndex + 1}/${batches.length} (${batch.length} items)`,
);
await this.loadBatch(target, batch, options, result);
// Brief pause between batches to avoid rate limits
if (batchIndex < batches.length - 1) {
await new Promise((resolve) => setTimeout(resolve, 1000));
}
}
console.log(
`[Migration] Load complete: ${result.successful} successful, ${result.failed.length} failed`,
);
return result;
}
/**
* Phase 4: Verify migration integrity
*/
async verify(
source: WorkItemExport[],
target: WorkItem[],
mapping: Map<string, string>,
): Promise<VerificationReport> {
await Promise.resolve();
console.log('[Migration] Starting verification');
const report: VerificationReport = {
totalItems: source.length,
successful: target.length,
failed: source.length - target.length,
dataIntegrityIssues: [],
};
// Verify each migrated item
for (const sourceItem of source) {
const targetId = mapping.get(sourceItem.title) ?? mapping.get(sourceItem.id);
Iif (!targetId) {
continue; // Item wasn't migrated
}
const targetItem = target.find((t) => t.id.includes(targetId));
if (!targetItem) {
report.dataIntegrityIssues.push({
originalId: sourceItem.id,
newId: targetId,
issue: 'Target item not found after migration',
});
continue;
}
// Check data integrity
this.verifyDataIntegrity(sourceItem, targetItem, report);
}
console.log(
`[Migration] Verification complete: ${report.dataIntegrityIssues.length} integrity issues found`,
);
return report;
}
// Private helper methods
private async transformWorkItem(
item: WorkItemExport,
targetProvider: Provider,
options: TransformOptions,
result: TransformResult,
): Promise<WorkItemImport> {
// Validate required fields
if (!item.title) {
throw new Error(`Failed to transform item ${item.id}: Missing or invalid title`);
}
// Map work item type using intelligent type mapper
const mappingInput: MappingInput = {
provider: item.provider, // Source provider
process: targetProvider === 'azure' ? 'agile' : undefined, // Target Azure process
title: item.title,
description: item.description,
};
// Add provider-specific hints
if (item.provider === 'gitlab') {
mappingInput.gitlab = {
glType: this.detectGitLabType(item),
isGroupEpic: item.type === 'epic',
childCount: item.relationships.children.length,
};
} else Eif (item.provider === 'github') {
mappingInput.github = {
labels: {
has: (label: string) => item.labels.some((l) => l.toLowerCase() === label.toLowerCase()),
all: item.labels,
},
childCount: item.relationships.children.length,
};
}
const typeMapping = TypeMapper.mapType(mappingInput);
// Transform users
const transformedAssignees = await this.transformUsers(
item.assignees,
options.mapUsers,
result,
);
// Transform labels
const transformedLabels = this.transformLabels(item.labels, options.mapLabels, result);
// Add type mapping tags if needed
Iif (typeMapping.addTags.length > 0) {
transformedLabels.push(...typeMapping.addTags);
result.warnings.push(
`Added type mapping tags for ${item.id}: ${typeMapping.addTags.join(', ')}`,
);
}
// Handle custom fields
const customFields = await this.transformCustomFields(
item.providerFields,
item.provider,
options.customFieldMapping,
result,
);
// Preserve original ID in description if requested
let description = item.description;
if (options.preserveIds) {
description = `**Migrated from ${item.provider}:${item.id}**\n\n${description}`;
}
// Handle missing fields based on strategy
this.handleMissingFields(
item,
targetProvider,
options.handleMissingFields,
result,
customFields,
);
const transformedItem: WorkItemImport = {
title: item.title,
description,
type: this.normalizeWorkItemType(typeMapping.targetType),
state: item.state,
labels: [...new Set(transformedLabels)], // Remove duplicates
assignees: transformedAssignees,
priority: item.priority,
customFields,
};
// Log transformation rationale
Eif (typeMapping.rationale.length > 0) {
result.warnings.push(`Type mapping for ${item.id}: ${typeMapping.rationale.join('; ')}`);
}
return transformedItem;
}
private async loadBatch(
target: IProviderAdapter,
batch: WorkItemImport[],
options: LoadOptions,
result: MigrationResult,
): Promise<void> {
for (const item of batch) {
try {
const created = await target.createWorkItem({
type: item.type,
title: item.title,
description: item.description,
assignees: item.assignees,
labels: item.labels,
priority: item.priority,
customFields: item.customFields,
});
result.successful++;
result.mapping.set(item.title, created.id);
} catch (error) {
const errorMsg = error instanceof Error ? error.message : String(error);
result.failed.push({
id: item.title,
reason: errorMsg,
});
if (!options.continueOnError) {
throw new Error(`Batch load failed on item "${item.title}": ${errorMsg}`);
}
}
}
}
private createBatches<T>(items: T[], batchSize: number): T[][] {
const batches: T[][] = [];
for (let i = 0; i < items.length; i += batchSize) {
batches.push(items.slice(i, i + batchSize));
}
return batches;
}
private async transformUsers(
users: User[],
userMapping: Map<string, string>,
result: TransformResult,
): Promise<User[]> {
await Promise.resolve();
const transformedUsers: User[] = [];
for (const user of users) {
const mappedUsername = userMapping.get(user.username) ?? userMapping.get(user.email ?? '');
if (mappedUsername) {
transformedUsers.push({
...user,
username: mappedUsername,
});
result.fieldsMapped.set(`user:${user.username}`, mappedUsername);
} else {
result.warnings.push(`No mapping found for user: ${user.username} (${user.displayName})`);
// Keep original user - target system will need to handle unmapped users
transformedUsers.push(user);
}
}
return transformedUsers;
}
private transformLabels(
labels: string[],
labelMapping: Map<string, string>,
result: TransformResult,
): string[] {
const transformedLabels: string[] = [];
for (const label of labels) {
const mappedLabel = labelMapping.get(label);
if (mappedLabel) {
transformedLabels.push(mappedLabel);
result.fieldsMapped.set(`label:${label}`, mappedLabel);
} else {
transformedLabels.push(label); // Keep original label
}
}
return transformedLabels;
}
private async transformCustomFields(
providerFields: unknown,
sourceProvider: Provider,
customFieldMapping: Record<string, string>,
result: TransformResult,
): Promise<Record<string, unknown>> {
await Promise.resolve();
const customFields: Record<string, unknown> = {};
// Extract meaningful fields from provider-specific data
if (
sourceProvider === 'gitlab' &&
typeof providerFields === 'object' &&
providerFields !== null
) {
Eif ('weight' in providerFields && providerFields.weight) {
const targetField = customFieldMapping['weight'] ?? 'weight';
customFields[targetField] = providerFields.weight;
result.fieldsMapped.set('weight', targetField);
}
if ('timeEstimate' in providerFields && providerFields.timeEstimate) {
const targetField = customFieldMapping['timeEstimate'] ?? 'timeEstimate';
customFields[targetField] = providerFields.timeEstimate;
result.fieldsMapped.set('timeEstimate', targetField);
}
}
Iif (
sourceProvider === 'azure' &&
typeof providerFields === 'object' &&
providerFields !== null
) {
if ('storyPoints' in providerFields && providerFields.storyPoints) {
const targetField = customFieldMapping['storyPoints'] ?? 'storyPoints';
customFields[targetField] = providerFields.storyPoints;
result.fieldsMapped.set('storyPoints', targetField);
}
if ('effort' in providerFields && providerFields.effort) {
const targetField = customFieldMapping['effort'] ?? 'effort';
customFields[targetField] = providerFields.effort;
result.fieldsMapped.set('effort', targetField);
}
}
// Apply explicit custom field mappings
for (const [sourceField, targetField] of Object.entries(customFieldMapping)) {
Eif (
typeof providerFields === 'object' &&
providerFields !== null &&
sourceField in providerFields
) {
customFields[targetField] = (providerFields as Record<string, unknown>)[sourceField];
result.fieldsMapped.set(sourceField, targetField);
}
}
return customFields;
}
private handleMissingFields(
item: WorkItemExport,
targetProvider: Provider,
strategy: 'ignore' | 'metadata' | 'description',
result: TransformResult,
customFields: Record<string, unknown>,
): void {
const missingFields: string[] = [];
// Check for provider-specific features that might be lost
if (item.provider === 'gitlab' && targetProvider !== 'gitlab') {
const fields = item.providerFields as unknown as Record<string, unknown>;
if ('confidential' in fields && fields.confidential) {
missingFields.push('confidential');
}
if ('weight' in fields && fields.weight && !customFields.weight) {
missingFields.push('weight');
}
}
Iif (item.provider === 'azure' && targetProvider !== 'azure') {
const fields = item.providerFields as unknown as Record<string, unknown>;
if ('areaPath' in fields && fields.areaPath) {
missingFields.push('areaPath');
}
if ('iterationPath' in fields && fields.iterationPath) {
missingFields.push('iterationPath');
}
}
if (missingFields.length > 0) {
result.fieldsLost.push(...missingFields);
switch (strategy) {
case 'ignore':
// Do nothing
break;
case 'metadata':
customFields['migrationMetadata'] = {
lostFields: missingFields,
sourceProvider: item.provider,
};
break;
case 'description':
// Fields are handled in description during transformation
break;
}
result.warnings.push(`Lost fields for ${item.id}: ${missingFields.join(', ')}`);
}
}
private detectGitLabType(
item: WorkItemExport,
): 'epic' | 'issue' | 'task' | 'incident' | 'bug' | 'test_case' {
Iif (item.type === 'epic') return 'epic';
Iif (item.type === 'bug') return 'incident';
Iif (item.type === 'task') return 'task';
Iif (item.type === 'test') return 'test_case';
Eif (item.type === 'story') return 'issue'; // GitLab treats stories as issues
return 'issue';
}
private normalizeWorkItemType(typeString: string): WorkItemType {
const typeMap: Record<string, WorkItemType> = {
Epic: 'epic',
Feature: 'feature',
'User Story': 'story',
'Product Backlog Item': 'story',
Issue: 'issue',
Task: 'task',
Bug: 'bug',
'Test Case': 'test',
epic: 'epic',
feature: 'feature',
story: 'story',
issue: 'issue',
task: 'task',
bug: 'bug',
test: 'test',
};
return typeMap[typeString] ?? 'issue';
}
private verifyDataIntegrity(
sourceItem: WorkItemExport,
targetItem: WorkItem,
report: VerificationReport,
): void {
// Check title integrity
if (sourceItem.title !== targetItem.title) {
report.dataIntegrityIssues.push({
originalId: sourceItem.id,
newId: targetItem.id,
issue: `Title mismatch: expected "${sourceItem.title}", got "${targetItem.title}"`,
});
}
// Check state integrity
if (sourceItem.state !== targetItem.state) {
report.dataIntegrityIssues.push({
originalId: sourceItem.id,
newId: targetItem.id,
issue: `State mismatch: expected "${sourceItem.state}", got "${targetItem.state}"`,
});
}
// Check assignee count (allowing for platform limitations)
const expectedAssigneeCount = Math.min(sourceItem.assignees.length, 10); // Platform limits
if (targetItem.assignees.length !== expectedAssigneeCount) {
report.dataIntegrityIssues.push({
originalId: sourceItem.id,
newId: targetItem.id,
issue: `Assignee count mismatch: expected ${expectedAssigneeCount}, got ${targetItem.assignees.length}`,
});
}
}
}
/**
* Migration orchestrator for complex scenarios
*/
export class MigrationOrchestrator {
constructor(private pipeline: MigrationPipeline = new DefaultMigrationPipeline()) {}
/**
* Execute full migration between providers
*/
async migrate(
source: IProviderAdapter,
target: IProviderAdapter,
filter: WorkItemFilter,
options: {
transform: TransformOptions;
load: LoadOptions;
skipVerification?: boolean;
},
): Promise<{
migration: MigrationResult;
verification?: VerificationReport;
transformResult: TransformResult;
}> {
console.log(`[Migration] Starting full migration`);
// Phase 1: Extract
const exported = await this.pipeline.extract(source, filter);
// Phase 2: Transform
const transformResult = await this.pipeline.transform(
exported,
this.detectTargetProvider(target),
options.transform,
);
if (transformResult.errors.length > 0) {
throw new Error(`Transformation failed: ${transformResult.errors.join('; ')}`);
}
// Phase 3: Load
const migration = await this.pipeline.load(target, transformResult.items, options.load);
let verification: VerificationReport | undefined;
// Phase 4: Verify (optional)
if (!options.skipVerification && !options.load.dryRun) {
try {
const targetItems = await target.listWorkItems({ state: 'all' });
verification = await this.pipeline.verify(exported, targetItems, migration.mapping);
} catch (error) {
console.warn(
`[Migration] Verification failed: ${error instanceof Error ? error.message : String(error)}`,
);
}
}
console.log(`[Migration] Migration complete`);
return { migration, verification, transformResult };
}
private detectTargetProvider(adapter: IProviderAdapter): Provider {
const className = adapter.constructor.name;
if (className.includes('GitLab')) return 'gitlab';
if (className.includes('GitHub')) return 'github';
if (className.includes('Azure')) return 'azure';
throw new Error(`Cannot detect provider type from adapter: ${className}`);
}
}
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