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import { IStorageProvider } from '../domain/interfaces/storage.interface';
@Injectable({
providedIn: 'root'
})
export class IndexedDbStorageService implements IStorageProvider {
private dbName = 'cas-storage';
private storeName = 'content';
private version = 1;
private db: IDBDatabase | null = null;
private initializationError: Error | null = null;
private initializationPromise: Promise<void>;
constructor() {
this.initializationPromise = this.initializeDb().catch(() => {
// Silently catch initialization errors - they will be handled in ensureDb
});
}
private async initializeDb(): Promise<void> {
return new Promise<void>((resolve, reject) => {
const request = indexedDB.open(this.dbName, this.version);
request.onerror = () => {
const error = new Error('Failed to open IndexedDB');
this.initializationError = error;
reject(error);
};
request.onsuccess = (event) => {
this.db = (event.target as IDBOpenDBRequest).result;
resolve();
};
request.onupgradeneeded = (event) => {
const db = (event.target as IDBOpenDBRequest).result;
if (!db.objectStoreNames.contains(this.storeName)) {
db.createObjectStore(this.storeName);
}
};
}).catch((error) => {
this.initializationError = error;
throw error;
});
}
private async ensureDb(): Promise<IDBDatabase> {
if (this.initializationError) {
throw new Error('IndexedDB not available');
}
if (!this.db) {
try {
await this.initializationPromise;
} catch (error) {
throw new Error('IndexedDB not available');
}
}
Iif (!this.db) {
throw new Error('IndexedDB not available');
}
return this.db;
}
async read(path: string): Promise<Uint8Array> {
const db = await this.ensureDb();
return new Promise((resolve, reject) => {
const transaction = db.transaction([this.storeName], 'readonly');
const store = transaction.objectStore(this.storeName);
const request = store.get(path);
request.onsuccess = () => {
const result = request.result;
if (result && result instanceof Uint8Array) {
resolve(result);
} else Iif (result) {
// Handle legacy data that might be stored differently
resolve(new Uint8Array(result));
} else {
reject(new Error(`Path not found: ${path}`));
}
};
request.onerror = () => {
reject(new Error(`Failed to read path: ${path}`));
};
});
}
async write(path: string, data: Uint8Array): Promise<void> {
const db = await this.ensureDb();
return new Promise((resolve, reject) => {
const transaction = db.transaction([this.storeName], 'readwrite');
const store = transaction.objectStore(this.storeName);
const request = store.put(data, path);
request.onsuccess = () => {
resolve();
};
request.onerror = () => {
reject(new Error(`Failed to write path: ${path}`));
};
});
}
async exists(path: string): Promise<boolean> {
const db = await this.ensureDb();
return new Promise((resolve, reject) => {
const transaction = db.transaction([this.storeName], 'readonly');
const store = transaction.objectStore(this.storeName);
const request = store.count(path);
request.onsuccess = () => {
resolve(request.result > 0);
};
request.onerror = () => {
reject(new Error(`Failed to check existence: ${path}`));
};
});
}
async list(): Promise<string[]> {
const db = await this.ensureDb();
return new Promise((resolve, reject) => {
const transaction = db.transaction([this.storeName], 'readonly');
const store = transaction.objectStore(this.storeName);
const request = store.getAllKeys();
request.onsuccess = () => {
const keys = request.result;
resolve(keys.map(key => String(key)));
};
request.onerror = () => {
reject(new Error('Failed to list paths'));
};
});
}
async delete(path: string): Promise<void> {
const db = await this.ensureDb();
return new Promise((resolve, reject) => {
const transaction = db.transaction([this.storeName], 'readwrite');
const store = transaction.objectStore(this.storeName);
const request = store.delete(path);
request.onsuccess = () => {
resolve();
};
request.onerror = () => {
reject(new Error(`Failed to delete path: ${path}`));
};
});
}
async clear(): Promise<void> {
const db = await this.ensureDb();
return new Promise((resolve, reject) => {
const transaction = db.transaction([this.storeName], 'readwrite');
const store = transaction.objectStore(this.storeName);
const request = store.clear();
request.onsuccess = () => {
resolve();
};
request.onerror = () => {
reject(new Error('Failed to clear storage'));
};
});
}
async getSize(): Promise<number> {
const db = await this.ensureDb();
return new Promise((resolve, reject) => {
const transaction = db.transaction([this.storeName], 'readonly');
const store = transaction.objectStore(this.storeName);
let totalSize = 0;
const request = store.openCursor();
request.onsuccess = (event) => {
const cursor = (event.target as IDBRequest).result;
if (cursor) {
if (cursor.value instanceof Uint8Array) {
totalSize += cursor.value.byteLength;
}
cursor.continue();
} else {
resolve(totalSize);
}
};
request.onerror = () => {
reject(new Error('Failed to calculate storage size'));
};
});
}
} |