/**
* Simple in-memory TTL cache.
*
* Dies with the process — no disk persistence.
* TTLs: balances 5min, transactions 15min, accounts 1hr.
*/
interface CacheEntry<T> {
value: T;
expiresAt: number;
}
export class Cache {
private store = new Map<string, CacheEntry<unknown>>();
get<T>(key: string): T | undefined {
const entry = this.store.get(key);
if (!entry) return undefined;
if (Date.now() > entry.expiresAt) {
this.store.delete(key);
return undefined;
}
return entry.value as T;
}
set<T>(key: string, value: T, ttlMs: number): void {
this.store.set(key, { value, expiresAt: Date.now() + ttlMs });
}
clear(): void {
this.store.clear();
}
}
// Singleton + TTL constants
export const cache = new Cache();
export const TTL = {
ACCOUNTS: 60 * 60 * 1000, // 1 hour
TRANSACTIONS: 15 * 60 * 1000, // 15 minutes
BALANCES: 5 * 60 * 1000, // 5 minutes
} as const;
