@btc-vision/bsi-common/src/cache/NodeCacheStrategy.ts

Common library for OP_NET.

import NodeCache from 'node-cache';
import { ICacheStrategy } from './interfaces/ICacheStrategy.js';

export class NodeCacheStrategy<T> implements ICacheStrategy<T> {
    private readonly maxItems: number = 0;
    private cache: NodeCache;

    constructor(maxItems: number = 1024) {
        this.cache = new NodeCache();
        this.maxItems = maxItems;
    }

    public async get(key: string): Promise<T | undefined> {
        return this.cache.get(key);
    }

    public set(key: string, value: T, ttl: number = 0): boolean {
        if (this.cache.keys().length > this.maxItems) {
            const firstKey = this.cache.keys()[0];
            this.cache.del(firstKey);
        }

        return this.cache.set(key, value, ttl);
    }
}