ntms/src/utils/caching.ts

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class KeyTimeout {
  timeoutHandleForKey: any;

  constructor() {
    this.timeoutHandleForKey = {};
  }

  clearTimeout(key) {
    clearTimeout(this.timeoutHandleForKey[key]);
  }

  updateTimeout(key, durationMs, callback) {
    this.clearTimeout(key);
    this.timeoutHandleForKey[key] = setTimeout(() => {
      callback();
    }, durationMs);
  }
}

let cache = {};
let ttl = 1000 * 60;
class MemoryCache {
  keyTimeout: KeyTimeout;

  constructor() {
    this.keyTimeout = new KeyTimeout();
  }

  get(key) {
    return cache[key];
  }

  remove(key) {
    this.keyTimeout.clearTimeout(key);
    delete cache[key];
  }

  set(key, value) {
    Object.assign(cache, { [key]: value });
    if (typeof ttl === "number") {
      this.keyTimeout.updateTimeout(key, ttl, () => this.remove(key));
    }
  }
}

const { fetchBuilder } = require("node-fetch-cache");

const fetch = fetchBuilder.withCache(new MemoryCache());

export default fetch;