Class CacheDatabase

packages/service-worker/worker/src/db-cache.ts:17–48

 * state within mock `Response` objects.
 */
export class CacheDatabase implements Database {
  private cacheNamePrefix = 'db';
  private tables = new Map<string, CacheTable>();

  constructor(private adapter: Adapter) {}

  'delete'(name: string): Promise<boolean> {
    if (this.tables.has(name)) {
      this.tables.delete(name);
    }
    return this.adapter.caches.delete(`${this.cacheNamePrefix}:${name}`);
  }

  async list(): Promise<string[]> {
    const prefix = `${this.cacheNamePrefix}:`;
    const allCacheNames = await this.adapter.caches.keys();
    const dbCacheNames = allCacheNames.filter((name) => name.startsWith(prefix));

    // Return the un-prefixed table names, so they can be used with other `CacheDatabase` methods
    // (for example, for opening/deleting a table).
    return dbCacheNames.map((name) => name.slice(prefix.length));
  }

  async open(name: string, cacheQueryOptions?: CacheQueryOptions): Promise<Table> {
    if (!this.tables.has(name)) {
      const cache = await this.adapter.caches.open(`${this.cacheNamePrefix}:${name}`);
      const table = new CacheTable(name, cache, this.adapter, cacheQueryOptions);
      this.tables.set(name, table);
    }
    return this.tables.get(name)!;
  }
}

/**
 * A `Table` backed by a `Cache`.