easy-polling/index.js

Easy-polling aims to achieve one simple and pure task:\ Check result of an asynchronous task until the result matched required criteria.\ This process is so called "polling" or "poll"!.

module.exports = async function (
  fnAsyncTask,
  fnValidate,
  msInterval,
  msTimeout
) {
  let result = await fnAsyncTask();

  let totalTime = 0;
  while (!fnValidate(result)) {
    if (totalTime > msTimeout) return null;
    await wait(msInterval);
    result = await fnAsyncTask();
    totalTime += msInterval;
  }
  return result;
};

const wait = function (msInterval) {
  return new Promise((resolve) => {
    setTimeout(resolve, msInterval);
  });
};