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import { BehaviorSubject, Subject } from 'rxjs';
import { IStorageProvider } from '../../domain/interfaces/storage.interface';
import { IPFSStorageService } from './ipfs-storage.service';
import { HeliaStorageService } from '../helia/helia-storage.service';
import { STORAGE_PROVIDER, STORAGE_TYPE, StorageType } from '../storage-provider.factory';
export interface MigrationProgress {
totalItems: number;
processedItems: number;
successfulItems: number;
failedItems: number;
currentItem?: string;
status: 'idle' | 'preparing' | 'migrating' | 'completed' | 'failed';
errors: Array<{ path: string; error: string }>;
}
export interface MigrationOptions {
batchSize?: number;
deleteAfterMigration?: boolean;
skipExisting?: boolean;
filter?: (path: string) => boolean;
}
@Injectable({
providedIn: 'root'
})
export class IPFSMigrationService {
private progressSubject = new BehaviorSubject<MigrationProgress>({
totalItems: 0,
processedItems: 0,
successfulItems: 0,
failedItems: 0,
status: 'idle',
errors: []
});
private cancelSubject = new Subject<void>();
private isRunning = false;
private isCancelled = false;
progress$ = this.progressSubject.asObservable();
constructor(
@Inject(STORAGE_PROVIDER) private currentStorageProvider: IStorageProvider,
@Inject(STORAGE_TYPE) private currentStorageType: StorageType
) {}
/**
* Migrate content from current storage provider to IPFS or Helia
*/
async migrateToIPFS(
targetProvider: IPFSStorageService | HeliaStorageService,
options: MigrationOptions = {}
): Promise<MigrationProgress> {
if (this.isRunning) {
throw new Error('Migration is already in progress');
}
if (this.currentStorageProvider === targetProvider) {
throw new Error('Cannot migrate to the same storage provider');
}
this.isRunning = true;
this.isCancelled = false;
this.cancelSubject = new Subject<void>();
const {
batchSize = 10,
deleteAfterMigration = false,
skipExisting = true,
filter
} = options;
try {
// Update status to preparing
this.updateProgress({ status: 'preparing' });
// Get list of all items to migrate
const allPaths = await this.currentStorageProvider.list();
const pathsToMigrate = filter ? allPaths.filter(filter) : allPaths;
// Initialize progress
this.updateProgress({
totalItems: pathsToMigrate.length,
processedItems: 0,
successfulItems: 0,
failedItems: 0,
status: 'migrating',
errors: []
});
// Process in batches
for (let i = 0; i < pathsToMigrate.length; i += batchSize) {
// Check for cancellation
if (this.isCancelled) {
this.updateProgress({ status: 'failed' });
break;
}
const batch = pathsToMigrate.slice(i, i + batchSize);
await this.processBatch(batch, targetProvider, skipExisting, deleteAfterMigration);
}
// Update final status
const finalProgress = this.progressSubject.value;
if (finalProgress.failedItems === 0) {
this.updateProgress({ status: 'completed' });
} else {
this.updateProgress({ status: 'failed' });
}
return this.progressSubject.value;
} finally {
this.isRunning = false;
}
}
/**
* Process a batch of items for migration
*/
private async processBatch(
paths: string[],
targetProvider: IPFSStorageService | HeliaStorageService,
skipExisting: boolean,
deleteAfterMigration: boolean
): Promise<void> {
const promises = paths.map(path =>
this.migrateItem(path, targetProvider, skipExisting, deleteAfterMigration)
);
await Promise.all(promises);
}
/**
* Migrate a single item
*/
private async migrateItem(
path: string,
targetProvider: IPFSStorageService | HeliaStorageService,
skipExisting: boolean,
deleteAfterMigration: boolean
): Promise<void> {
try {
// Update current item
this.updateProgress({ currentItem: path });
// Check if already exists in target
if (skipExisting && await targetProvider.exists(path)) {
this.incrementProgress(true);
return;
}
// Read from source
const data = await this.currentStorageProvider.read(path);
// Write to target
await targetProvider.write(path, data);
// Delete from source if requested
if (deleteAfterMigration) {
await this.currentStorageProvider.delete(path);
}
// Update progress with success
this.incrementProgress(true);
} catch (error) {
// Update progress with error
const errorMessage = error instanceof Error ? error.message : 'Unknown error';
this.incrementProgress(false, { path, error: errorMessage });
}
}
/**
* Increment progress counters atomically
*/
private incrementProgress(success: boolean, error?: { path: string; error: string }): void {
const currentProgress = this.progressSubject.value;
if (success) {
this.updateProgress({
processedItems: currentProgress.processedItems + 1,
successfulItems: currentProgress.successfulItems + 1
});
} else {
this.updateProgress({
processedItems: currentProgress.processedItems + 1,
failedItems: currentProgress.failedItems + 1,
errors: error ? [...currentProgress.errors, error] : currentProgress.errors
});
}
}
/**
* Cancel ongoing migration
*/
cancelMigration(): void {
if (this.isRunning) {
this.isCancelled = true;
this.cancelSubject.next();
this.cancelSubject.complete();
}
}
/**
* Get migration statistics
*/
getMigrationStats(): {
canMigrate: boolean;
currentStorageType: StorageType;
estimatedItems?: number;
} {
const canMigrate = this.currentStorageType !== StorageType.IPFS &&
this.currentStorageType !== StorageType.HELIA;
return {
canMigrate,
currentStorageType: this.currentStorageType,
estimatedItems: undefined // This would require an async call to list()
};
}
/**
* Estimate migration size
*/
async estimateMigrationSize(): Promise<{
itemCount: number;
totalSize: number;
estimatedTime: number;
}> {
const paths = await this.currentStorageProvider.list();
let totalSize = 0;
// Sample first 10 items to estimate average size
const sampleSize = Math.min(10, paths.length);
let sampleTotalSize = 0;
for (let i = 0; i < sampleSize; i++) {
try {
const data = await this.currentStorageProvider.read(paths[i]);
sampleTotalSize += data.length;
} catch {
// Skip items that fail to read
}
}
// Estimate total size based on sample
const averageSize = sampleSize > 0 ? sampleTotalSize / sampleSize : 0;
totalSize = Math.round(averageSize * paths.length);
// Estimate time (assuming 1MB/s upload speed)
const estimatedTime = Math.round(totalSize / (1024 * 1024));
return {
itemCount: paths.length,
totalSize,
estimatedTime
};
}
/**
* Update migration progress
*/
private updateProgress(update: Partial<MigrationProgress>): void {
this.progressSubject.next({
...this.progressSubject.value,
...update
});
}
/**
* Reset migration state
*/
reset(): void {
this.progressSubject.next({
totalItems: 0,
processedItems: 0,
successfulItems: 0,
failedItems: 0,
status: 'idle',
errors: []
});
}
/**
* Check if migration is running
*/
isMigrationRunning(): boolean {
return this.isRunning;
}
} |