@daisugi/kintsugi/dist/esm/reuse_promise.js

Kintsugi is a set of utilities to help build a fault tolerant services.

import { SimpleMemoryStore } from './simple_memory_store.js';
import { stringifyArgs } from './stringify_args.js';
export function reusePromise(fn) {
    const simpleMemoryStore = new SimpleMemoryStore();
    return async function (...args) {
        const cacheKey = stringifyArgs(args);
        const cacheResponse = simpleMemoryStore.get(cacheKey);
        if (cacheResponse.isSuccess) {
            return cacheResponse.getValue();
        }
        const response = fn.apply(this, args).then((value) => {
            simpleMemoryStore.delete(cacheKey);
            return value;
        }, (reason) => {
            simpleMemoryStore.delete(cacheKey);
            throw reason;
        });
        simpleMemoryStore.set(cacheKey, response);
        return response;
    };
}
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