@directus/api/dist/permissions/utils/with-cache.js

Directus is a real-time API and App dashboard for managing SQL database content

import { getSimpleHash } from '@directus/utils';
import { useCache } from '../cache.js';
/**
 * Wraps a function with caching capabilities.
 *
 * @param namespace - A unique namespace for the cache key.
 * @param handler - The function to be wrapped.
 * @param prepareArg - Optional function to prepare arguments for hashing.
 * @returns A new function that caches the results of the original function.
 *
 * @NOTE Ensure that the `namespace` is unique to avoid cache key collisions.
 * @NOTE Ensure that the `prepareArg` function returns a JSON stringifiable representation of the arguments.
 */
export function withCache(namespace, handler, prepareArg) {
    const cache = useCache();
    return async (...args) => {
        const hashArgs = prepareArg ? prepareArg(...args) : args;
        const key = namespace + '-' + getSimpleHash(JSON.stringify(hashArgs));
        const cached = await cache.get(key);
        if (cached !== undefined) {
            return cached;
        }
        const res = await handler(...args);
        cache.set(key, res);
        return res;
    };
}