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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 | 43x 43x 112x 112x 626x 626x 222x 404x 404x 6x 404x 624x 1155x 18x 27x 246x | import { Seconds } from '@cardano-sdk/core'; import NodeCache from 'node-cache'; export type Key = string | number; export type AsyncAction<T> = () => Promise<T>; export class InMemoryCache { protected cache: NodeCache; protected ttlDefault: number; /** * * @param ttl The default time to live in seconds * @param cache The cache engine. It must extend NodeCache */ constructor(ttl: Seconds | 0, cache: NodeCache = new NodeCache()) { this.ttlDefault = ttl; this.cache = cache; } /** * Get a cached key value, if not found execute db query and cache the result with that key * * @param key Cache key * @param asyncAction Async function to get the value * @param ttl The time to live in seconds * @returns The value stored with the key */ public async get<T>(key: Key, asyncAction: AsyncAction<T>, ttl = this.ttlDefault): Promise<T> { const cachedValue: T | undefined = this.cache.get(key); if (cachedValue) { return cachedValue; } const resultPromise = asyncAction(); this.set( key, resultPromise.catch(() => this.cache.del(key)), ttl ); return resultPromise; } /** * Get a cached key * * @param key Cache key * @returns The value stored in the key */ public getVal<T>(key: Key) { return this.cache.get<T>(key); } /** * Set a cached key * * @param key Cache key * @param value A value to cache * @param ttl The time to live in seconds * @returns The success state of the operation */ public set<T>(key: Key, value: T, ttl = this.ttlDefault) { return this.cache.set<T>(key, value, ttl); } /** * Invalidate cached values * * @param keys cache key to delete or a array of cache keys */ public invalidate(keys: Key | Key[]) { this.cache.del(keys); } /** * List all keys within this cache * * @returns An array of all keys */ public keys() { return this.cache.keys(); } /** Clear the interval timeout which is set on check period option. Default: 600 */ public shutdown() { this.cache.close(); } /** Clear the whole data and reset the stats */ public clear() { this.cache.flushAll(); } } |