homebridge-connexoon/src/utils.js

A Homebridge plugin providing support for the Connexoon, TaHoma and Cozytouch platforms and accessories.

const ABORTED = Symbol('ABORTED');

const cachePromise = (promiseCallback, cacheDuration) => {
    let promise;
    let timeoutId;

    const reset = () => {
        promise = null;
    };

    const exec = async () => {
        if (promise) {
            return promise;
        }

        try {
            return await set(promiseCallback());
        } catch (error) {
            // reset cache on error
            reset();

            throw error;
        }
    };

    const set = (value) => {
        promise = value;

        clearTimeout(timeoutId);
        timeoutId = setTimeout(() => reset(), cacheDuration);

        return promise;
    };

    return { exec, reset, set };
};

const delayPromise = async (delay, abortSignal) =>
    new Promise((resolve, reject) => {
        const timeoutId = setTimeout(resolve, delay);

        const abort = () => {
            clearTimeout(timeoutId);
            reject(ABORTED);
        };

        if (abortSignal) {
            if (abortSignal.aborted) {
                return abort();
            }

            abortSignal.addEventListener('abort', abort);
        }
    });

module.exports = { cachePromise, delayPromise, ABORTED };