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// indexedDBCache.ts
export interface CacheConfig {
dbName: string;
storeName: string;
version?: number;
}
export interface CachedData<T> {
key: string;
data: T;
timestamp: number;
expiresAt?: number;
}
class IndexedDBCache {
private dbName: string;
private storeName: string;
private version: number;
private dbPromise: Promise<IDBDatabase> | null = null;
constructor(config: CacheConfig) {
this.dbName = config.dbName;
this.storeName = config.storeName;
this.version = config.version || 1;
}
/**
* Initialize the IndexedDB database
*/
private async initDB(): Promise<IDBDatabase> {
if (this.dbPromise) {
return this.dbPromise;
}
this.dbPromise = new Promise((resolve, reject) => {
const request = indexedDB.open(this.dbName, this.version);
request.onerror = () => {
reject(new Error(`Failed to open database: ${request.error}`));
};
request.onsuccess = () => {
resolve(request.result);
};
request.onupgradeneeded = (event) => {
const db = (event.target as IDBOpenDBRequest).result;
// Create object store if it doesn't exist
if (!db.objectStoreNames.contains(this.storeName)) {
const objectStore = db.createObjectStore(this.storeName, {
keyPath: "key",
});
objectStore.createIndex("timestamp", "timestamp", { unique: false });
objectStore.createIndex("expiresAt", "expiresAt", { unique: false });
}
};
});
return this.dbPromise;
}
/**
* Store data in IndexedDB
*/
async set<T>(key: string, data: T, ttlMs?: number): Promise<void> {
const db = await this.initDB();
const timestamp = Date.now();
const expiresAt = ttlMs ? timestamp + ttlMs : undefined;
const cachedData: CachedData<T> = {
key,
data,
timestamp,
expiresAt,
};
return new Promise((resolve, reject) => {
const transaction = db.transaction([this.storeName], "readwrite");
const store = transaction.objectStore(this.storeName);
const request = store.put(cachedData);
request.onsuccess = () => resolve();
request.onerror = () =>
reject(new Error(`Failed to store data: ${request.error}`));
});
}
/**
* Retrieve data from IndexedDB
*/
async get<T>(key: string): Promise<T | null> {
const db = await this.initDB();
return new Promise((resolve, reject) => {
const transaction = db.transaction([this.storeName], "readonly");
const store = transaction.objectStore(this.storeName);
const request = store.get(key);
request.onsuccess = () => {
const result = request.result as CachedData<T> | undefined;
if (!result) {
resolve(null);
return;
}
// Check if data has expired
if (result.expiresAt && Date.now() > result.expiresAt) {
// Delete expired data
this.delete(key);
resolve(null);
return;
}
resolve(result.data);
};
request.onerror = () =>
reject(new Error(`Failed to retrieve data: ${request.error}`));
});
}
/**
* Delete data from IndexedDB
*/
async delete(key: string): Promise<void> {
const db = await this.initDB();
return new Promise((resolve, reject) => {
const transaction = db.transaction([this.storeName], "readwrite");
const store = transaction.objectStore(this.storeName);
const request = store.delete(key);
request.onsuccess = () => resolve();
request.onerror = () =>
reject(new Error(`Failed to delete data: ${request.error}`));
});
}
/**
* Check if a key exists and is not expired
*/
async has(key: string): Promise<boolean> {
const data = await this.get(key);
return data !== null;
}
/**
* Clear all data from the store
*/
async clear(): Promise<void> {
const db = await this.initDB();
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 store: ${request.error}`));
});
}
/**
* Get all keys in the store
*/
async keys(): Promise<string[]> {
const db = await this.initDB();
return new Promise((resolve, reject) => {
const transaction = db.transaction([this.storeName], "readonly");
const store = transaction.objectStore(this.storeName);
const request = store.getAllKeys();
request.onsuccess = () => resolve(request.result as string[]);
request.onerror = () =>
reject(new Error(`Failed to get keys: ${request.error}`));
});
}
/**
* Remove expired entries
*/
async cleanExpired(): Promise<number> {
const db = await this.initDB();
let deletedCount = 0;
return new Promise((resolve, reject) => {
const transaction = db.transaction([this.storeName], "readwrite");
const store = transaction.objectStore(this.storeName);
const request = store.openCursor();
request.onsuccess = (event) => {
const cursor = (event.target as IDBRequest)
.result as IDBCursorWithValue | null;
if (cursor) {
const value = cursor.value as CachedData<unknown>;
if (value.expiresAt && Date.now() > value.expiresAt) {
cursor.delete();
deletedCount++;
}
cursor.continue();
} else {
resolve(deletedCount);
}
};
request.onerror = () =>
reject(new Error(`Failed to clean expired: ${request.error}`));
});
}
}
// Export a singleton factory
export const createCache = (config: CacheConfig) => new IndexedDBCache(config);
export default IndexedDBCache;
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